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libs: updated to Lua 5.4.3

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Remy Marquis 2021-04-04 20:43:47 +02:00
parent 94e77a2195
commit 0547e3d49d
53 changed files with 2153 additions and 1530 deletions
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2
lua/Makefile
View file

@ -46,7 +46,7 @@ TO_MAN= lua.1 luac.1
# Lua version and release.
V= 5.4
R= $V.0
R= $V.3
# Targets start here.
all: $(PLAT)

6
lua/README
View file

@ -1,9 +1,5 @@
This is Lua 5.4.0, released on 18 Jun 2020.
This is Lua 5.4.3, released on 15 Mar 2021.
For installation instructions, license details, and
further information about Lua, see doc/readme.html.
This is a slightly modified version for ET: Legacy.
The src/Makefile file has been adjusted to fit our
posix and posix32bit requirements.

10
lua/doc/contents.html
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@ -32,7 +32,7 @@ For a complete introduction to Lua programming, see the book
<P>
<SMALL>
Copyright &copy; 2020 Lua.org, PUC-Rio.
Copyright &copy; 2020&ndash;2021 Lua.org, PUC-Rio.
Freely available under the terms of the
<A HREF="http://www.lua.org/license.html">Lua license</A>.
</SMALL>
@ -95,6 +95,7 @@ Freely available under the terms of the
<UL>
<LI><A HREF="manual.html#4.1.1">4.1.1 &ndash; Stack Size</A>
<LI><A HREF="manual.html#4.1.2">4.1.2 &ndash; Valid and Acceptable Indices</A>
<LI><A HREF="manual.html#4.1.3">4.1.3 &ndash; Pointers to strings</A>
</UL>
<LI><A HREF="manual.html#4.2">4.2 &ndash; C Closures</A>
<LI><A HREF="manual.html#4.3">4.3 &ndash; Registry</A>
@ -197,7 +198,6 @@ Freely available under the terms of the
<A HREF="manual.html#pdf-debug.getregistry">debug.getregistry</A><BR>
<A HREF="manual.html#pdf-debug.getupvalue">debug.getupvalue</A><BR>
<A HREF="manual.html#pdf-debug.getuservalue">debug.getuservalue</A><BR>
<A HREF="manual.html#pdf-debug.setcstacklimit">debug.setcstacklimit</A><BR>
<A HREF="manual.html#pdf-debug.sethook">debug.sethook</A><BR>
<A HREF="manual.html#pdf-debug.setlocal">debug.setlocal</A><BR>
<A HREF="manual.html#pdf-debug.setmetatable">debug.setmetatable</A><BR>
@ -396,6 +396,7 @@ Freely available under the terms of the
<A HREF="manual.html#lua_callk">lua_callk</A><BR>
<A HREF="manual.html#lua_checkstack">lua_checkstack</A><BR>
<A HREF="manual.html#lua_close">lua_close</A><BR>
<A HREF="manual.html#lua_closeslot">lua_closeslot</A><BR>
<A HREF="manual.html#lua_compare">lua_compare</A><BR>
<A HREF="manual.html#lua_concat">lua_concat</A><BR>
<A HREF="manual.html#lua_copy">lua_copy</A><BR>
@ -475,7 +476,6 @@ Freely available under the terms of the
<A HREF="manual.html#lua_resume">lua_resume</A><BR>
<A HREF="manual.html#lua_rotate">lua_rotate</A><BR>
<A HREF="manual.html#lua_setallocf">lua_setallocf</A><BR>
<A HREF="manual.html#lua_setcstacklimit">lua_setcstacklimit</A><BR>
<A HREF="manual.html#lua_setfield">lua_setfield</A><BR>
<A HREF="manual.html#lua_setglobal">lua_setglobal</A><BR>
<A HREF="manual.html#lua_sethook">lua_sethook</A><BR>
@ -664,10 +664,10 @@ Freely available under the terms of the
<P CLASS="footer">
Last update:
Sat May 30 08:22:18 -03 2020
Wed Mar 3 13:04:44 UTC 2021
</P>
<!--
Last change: revised for Lua 5.4.0 (final)
Last change: revised for Lua 5.4.3
-->
</BODY>

298
lua/doc/manual.html
View file

@ -19,7 +19,7 @@ by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes
<P>
<SMALL>
Copyright &copy; 2020 Lua.org, PUC-Rio.
Copyright &copy; 2020&ndash;2021 Lua.org, PUC-Rio.
Freely available under the terms of the
<a href="http://www.lua.org/license.html">Lua license</a>.
</SMALL>
@ -143,6 +143,11 @@ The type <em>boolean</em> has two values, <b>false</b> and <b>true</b>.
Both <b>nil</b> and <b>false</b> make a condition false;
they are collectively called <em>false values</em>.
Any other value makes a condition true.
Despite its name,
<b>false</b> is frequently used as an alternative to <b>nil</b>,
with the key difference that <b>false</b> behaves
like a regular value in a table,
while a <b>nil</b> in a table represents an absent key.
<p>
@ -434,7 +439,7 @@ under certain events.
You can change several aspects of the behavior
of a value by setting specific fields in its metatable.
For instance, when a non-numeric value is the operand of an addition,
Lua checks for a function in the field "<code>__add</code>" of the value's metatable.
Lua checks for a function in the field <code>__add</code> of the value's metatable.
If it finds one,
Lua calls this function to perform the addition.
@ -901,7 +906,7 @@ For an object (table or userdata) to be finalized when collected,
you must <em>mark</em> it for finalization.
You mark an object for finalization when you set its metatable
and the metatable has a field indexed by the string "<code>__gc</code>".
and the metatable has a <code>__gc</code> metamethod.
Note that if you set a metatable without a <code>__gc</code> field
and later create that field in the metatable,
the object will not be marked for finalization.
@ -1992,16 +1997,8 @@ they are closed in the reverse order that they were declared.
If there is any error while running a closing method,
that error is handled like an error in the regular code
where the variable was defined.
However, Lua may call the method one more time.
<p>
After an error,
the other pending closing methods will still be called.
Errors in these methods
interrupt the respective method and generate a warning,
but are otherwise ignored;
the error reported is only the original one.
<p>
@ -2966,26 +2963,31 @@ When you interact with the Lua API,
you are responsible for ensuring consistency.
In particular,
<em>you are responsible for controlling stack overflow</em>.
You can use the function <a href="#lua_checkstack"><code>lua_checkstack</code></a>
to ensure that the stack has enough space for pushing new elements.
When you call any API function,
you must ensure the stack has enough room to accommodate the results.
<p>
There is one exception to the above rule:
When you call a Lua function
without a fixed number of results (see <a href="#lua_call"><code>lua_call</code></a>),
Lua ensures that the stack has enough space for all results.
However, it does not ensure any extra space.
So, before pushing anything on the stack after such a call
you should use <a href="#lua_checkstack"><code>lua_checkstack</code></a>.
<p>
Whenever Lua calls C,
it ensures that the stack has space for
at least <a name="pdf-LUA_MINSTACK"><code>LUA_MINSTACK</code></a> extra slots.
at least <a name="pdf-LUA_MINSTACK"><code>LUA_MINSTACK</code></a> extra elements;
that is, you can safely push up to <code>LUA_MINSTACK</code> values into it.
<code>LUA_MINSTACK</code> is defined as 20,
so that usually you do not have to worry about stack space
unless your code has loops pushing elements onto the stack.
<p>
When you call a Lua function
without a fixed number of results (see <a href="#lua_call"><code>lua_call</code></a>),
Lua ensures that the stack has enough space for all results,
but it does not ensure any extra space.
So, before pushing anything in the stack after such a call
you should use <a href="#lua_checkstack"><code>lua_checkstack</code></a>.
Whenever necessary,
you can use the function <a href="#lua_checkstack"><code>lua_checkstack</code></a>
to ensure that the stack has enough space for pushing new elements.
@ -3044,6 +3046,49 @@ which behaves like a nil value.
<h3>4.1.3 &ndash; <a name="4.1.3">Pointers to strings</a></h3>
<p>
Several functions in the API return pointers (<code>const char*</code>)
to Lua strings in the stack.
(See <a href="#lua_pushfstring"><code>lua_pushfstring</code></a>, <a href="#lua_pushlstring"><code>lua_pushlstring</code></a>,
<a href="#lua_pushstring"><code>lua_pushstring</code></a>, and <a href="#lua_tolstring"><code>lua_tolstring</code></a>.
See also <a href="#luaL_checklstring"><code>luaL_checklstring</code></a>, <a href="#luaL_checkstring"><code>luaL_checkstring</code></a>,
and <a href="#luaL_tolstring"><code>luaL_tolstring</code></a> in the auxiliary library.)
<p>
In general,
Lua's garbage collection can free or move internal memory
and then invalidate pointers to internal strings.
To allow a safe use of these pointers,
The API guarantees that any pointer to a string in a stack index
is valid while the string value at that index is not removed from the stack.
(It can be moved to another index, though.)
When the index is a pseudo-index (referring to an upvalue),
the pointer is valid while the corresponding call is active and
the corresponding upvalue is not modified.
<p>
Some functions in the debug interface
also return pointers to strings,
namely <a href="#lua_getlocal"><code>lua_getlocal</code></a>, <a href="#lua_getupvalue"><code>lua_getupvalue</code></a>,
<a href="#lua_setlocal"><code>lua_setlocal</code></a>, and <a href="#lua_setupvalue"><code>lua_setupvalue</code></a>.
For these functions, the pointer is guaranteed to
be valid while the caller function is active and
the given closure (if one was given) is in the stack.
<p>
Except for these guarantees,
the garbage collector is free to invalidate
any pointer to internal strings.
<h2>4.2 &ndash; <a name="4.2">C Closures</a></h2>
@ -3239,7 +3284,7 @@ Therefore, if a C&nbsp;function <code>foo</code> calls an API function
and this API function yields
(directly or indirectly by calling another function that yields),
Lua cannot return to <code>foo</code> any more,
because the <code>longjmp</code> removes its frame from the C stack.
because the <code>longjmp</code> removes its frame from the C&nbsp;stack.
<p>
@ -3269,7 +3314,7 @@ After the thread resumes,
it eventually will finish running the callee function.
However,
the callee function cannot return to the original function,
because its frame in the C stack was destroyed by the yield.
because its frame in the C&nbsp;stack was destroyed by the yield.
Instead, Lua calls a <em>continuation function</em>,
which was given as an argument to the callee function.
As the name implies,
@ -3389,7 +3434,7 @@ depending on the situation;
an interrogation mark '<code>?</code>' means that
we cannot know how many elements the function pops/pushes
by looking only at its arguments.
(For instance, they may depend on what is on the stack.)
(For instance, they may depend on what is in the stack.)
The third field, <code>x</code>,
tells whether the function may raise errors:
'<code>-</code>' means the function never raises any error;
@ -3408,7 +3453,7 @@ and therefore may raise any errors.
<p>
Converts the acceptable index <code>idx</code>
into an equivalent absolute index
(that is, one that does not depend on the stack top).
(that is, one that does not depend on the stack size).
@ -3678,7 +3723,7 @@ of numeric arguments and returns their average and their sum:
<pre>int lua_checkstack (lua_State *L, int n);</pre>
<p>
Ensures that the stack has space for at least <code>n</code> extra slots,
Ensures that the stack has space for at least <code>n</code> extra elements,
that is, that you can safely push up to <code>n</code> values into it.
It returns false if it cannot fulfill the request,
either because it would cause the stack
@ -3686,7 +3731,7 @@ to be greater than a fixed maximum size
(typically at least several thousand elements) or
because it cannot allocate memory for the extra space.
This function never shrinks the stack;
if the stack already has space for the extra slots,
if the stack already has space for the extra elements,
it is left unchanged.
@ -3715,6 +3760,29 @@ will probably need to close states as soon as they are not needed.
<hr><h3><a name="lua_closeslot"><code>lua_closeslot</code></a></h3><p>
<span class="apii">[-0, +0, <em>e</em>]</span>
<pre>void lua_closeslot (lua_State *L, int index);</pre>
<p>
Close the to-be-closed slot at the given index and set its value to <b>nil</b>.
The index must be the last index previously marked to be closed
(see <a href="#lua_toclose"><code>lua_toclose</code></a>) that is still active (that is, not closed yet).
<p>
A <code>__close</code> metamethod cannot yield
when called through this function.
<p>
(Exceptionally, this function was introduced in release 5.4.3.
It is not present in previous 5.4 releases.)
<hr><h3><a name="lua_compare"><code>lua_compare</code></a></h3><p>
<span class="apii">[-0, +0, <em>e</em>]</span>
<pre>int lua_compare (lua_State *L, int index1, int index2, int op);</pre>
@ -4443,6 +4511,10 @@ plus an associated block of raw memory with <code>size</code> bytes.
<p>
The function returns the address of the block of memory.
Lua ensures that this address is valid as long as
the corresponding userdata is alive (see <a href="#2.5">&sect;2.5</a>).
Moreover, if the userdata is marked for finalization (see <a href="#2.5.3">&sect;2.5.3</a>),
its address is valid at least until the call to its finalizer.
@ -4600,11 +4672,12 @@ except that it allows the called function to yield (see <a href="#4.5">&sect;4.5
<hr><h3><a name="lua_pop"><code>lua_pop</code></a></h3><p>
<span class="apii">[-n, +0, &ndash;]</span>
<span class="apii">[-n, +0, <em>e</em>]</span>
<pre>void lua_pop (lua_State *L, int n);</pre>
<p>
Pops <code>n</code> elements from the stack.
It is implemented as a macro over <a href="#lua_settop"><code>lua_settop</code></a>.
@ -4688,7 +4761,7 @@ This function is equivalent to <a href="#lua_pushcclosure"><code>lua_pushcclosur
<p>
Pushes onto the stack a formatted string
and returns a pointer to this string.
and returns a pointer to this string (see <a href="#4.1.3">&sect;4.1.3</a>).
It is similar to the ISO&nbsp;C function <code>sprintf</code>,
but has two important differences.
First,
@ -4788,7 +4861,7 @@ including embedded zeros.
<p>
Returns a pointer to the internal copy of the string.
Returns a pointer to the internal copy of the string (see <a href="#4.1.3">&sect;4.1.3</a>).
@ -4829,7 +4902,7 @@ the function returns.
<p>
Returns a pointer to the internal copy of the string.
Returns a pointer to the internal copy of the string (see <a href="#4.1.3">&sect;4.1.3</a>).
<p>
@ -5083,10 +5156,12 @@ and then pops the top element.
Resets a thread, cleaning its call stack and closing all pending
to-be-closed variables.
Returns a status code:
<a href="#pdf-LUA_OK"><code>LUA_OK</code></a> for no errors in closing methods,
<a href="#pdf-LUA_OK"><code>LUA_OK</code></a> for no errors in the thread
(either the original error that stopped the thread or
errors in closing methods),
or an error status otherwise.
In case of error,
leaves the error object on the top of the stack,
leaves the error object on the top of the stack.
@ -5273,7 +5348,7 @@ for the "newindex" event (see <a href="#2.4">&sect;2.4</a>).
<hr><h3><a name="lua_settop"><code>lua_settop</code></a></h3><p>
<span class="apii">[-?, +?, &ndash;]</span>
<span class="apii">[-?, +?, <em>e</em>]</span>
<pre>void lua_settop (lua_State *L, int index);</pre>
<p>
@ -5284,6 +5359,11 @@ then the new elements are filled with <b>nil</b>.
If <code>index</code> is&nbsp;0, then all stack elements are removed.
<p>
This function can run arbitrary code when removing an index
marked as to-be-closed from the stack.
@ -5399,33 +5479,37 @@ otherwise, returns <code>NULL</code>.
<hr><h3><a name="lua_toclose"><code>lua_toclose</code></a></h3><p>
<span class="apii">[-0, +0, <em>v</em>]</span>
<span class="apii">[-0, +0, <em>m</em>]</span>
<pre>void lua_toclose (lua_State *L, int index);</pre>
<p>
Marks the given index in the stack as a
to-be-closed "variable" (see <a href="#3.3.8">&sect;3.3.8</a>).
to-be-closed slot (see <a href="#3.3.8">&sect;3.3.8</a>).
Like a to-be-closed variable in Lua,
the value at that index in the stack will be closed
the value at that slot in the stack will be closed
when it goes out of scope.
Here, in the context of a C function,
to go out of scope means that the running function returns to Lua,
there is an error,
or the index is removed from the stack through
<a href="#lua_settop"><code>lua_settop</code></a> or <a href="#lua_pop"><code>lua_pop</code></a>.
An index marked as to-be-closed should not be removed from the stack
by any other function in the API except <a href="#lua_settop"><code>lua_settop</code></a> or <a href="#lua_pop"><code>lua_pop</code></a>.
or there is an error,
or the slot is removed from the stack through
<a href="#lua_settop"><code>lua_settop</code></a> or <a href="#lua_pop"><code>lua_pop</code></a>,
or there is a call to <a href="#lua_closeslot"><code>lua_closeslot</code></a>.
A slot marked as to-be-closed should not be removed from the stack
by any other function in the API except <a href="#lua_settop"><code>lua_settop</code></a> or <a href="#lua_pop"><code>lua_pop</code></a>,
unless previously deactivated by <a href="#lua_closeslot"><code>lua_closeslot</code></a>.
<p>
This function should not be called for an index
that is equal to or below an active to-be-closed index.
that is equal to or below an active to-be-closed slot.
<p>
This function can raise an out-of-memory error.
In that case, the value in the given index is immediately closed,
as if it was already marked.
Note that, both in case of errors and of a regular return,
by the time the <code>__close</code> metamethod runs,
the C&nbsp;stack was already unwound,
so that any automatic C&nbsp;variable declared in the calling function
(e.g., a buffer) will be out of scope.
@ -5482,18 +5566,12 @@ when <code>lua_tolstring</code> is applied to keys during a table traversal.)
<p>
<code>lua_tolstring</code> returns a pointer
to a string inside the Lua state.
to a string inside the Lua state (see <a href="#4.1.3">&sect;4.1.3</a>).
This string always has a zero ('<code>\0</code>')
after its last character (as in&nbsp;C),
but can contain other zeros in its body.
<p>
Because Lua has garbage collection,
there is no guarantee that the pointer returned by <code>lua_tolstring</code>
will be valid after the corresponding Lua value is removed from the stack.
@ -5944,7 +6022,7 @@ true if the function is a vararg function
</li>
<li><b><code>ftransfer</code>: </b>
the index on the stack of the first value being "transferred",
the index in the stack of the first value being "transferred",
that is, parameters in a call or return values in a return.
(The other values are in consecutive indices.)
Using this index, you can access and modify these values
@ -6141,7 +6219,7 @@ an identification of the <em>activation record</em>
of the function executing at a given level.
Level&nbsp;0 is the current running function,
whereas level <em>n+1</em> is the function that has called level <em>n</em>
(except for tail calls, which do not count on the stack).
(except for tail calls, which do not count in the stack).
When called with a level greater than the stack depth,
<a href="#lua_getstack"><code>lua_getstack</code></a> returns 0;
otherwise it returns 1.
@ -6218,24 +6296,6 @@ calling <a href="#lua_yield"><code>lua_yield</code></a> with <code>nresults</cod
<hr><h3><a name="lua_setcstacklimit"><code>lua_setcstacklimit</code></a></h3><p>
<span class="apii">[-0, +0, &ndash;]</span>
<pre>int (lua_setcstacklimit) (lua_State *L, unsigned int limit);</pre>
<p>
Sets a new limit for the C stack.
This limit controls how deeply nested calls can go in Lua,
with the intent of avoiding a stack overflow.
Returns the old limit in case of success,
or zero in case of error.
For more details about this function,
see <a href="#pdf-debug.setcstacklimit"><code>debug.setcstacklimit</code></a>,
its equivalent in the standard library.
<hr><h3><a name="lua_sethook"><code>lua_sethook</code></a></h3><p>
<span class="apii">[-0, +0, &ndash;]</span>
<pre>void lua_sethook (lua_State *L, lua_Hook f, int mask, int count);</pre>
@ -6259,8 +6319,7 @@ For each event, the hook is called as explained below:
<ul>
<li><b>The call hook: </b> is called when the interpreter calls a function.
The hook is called just after Lua enters the new function,
before the function gets its arguments.
The hook is called just after Lua enters the new function.
</li>
<li><b>The return hook: </b> is called when the interpreter returns from a function.
@ -7573,7 +7632,7 @@ it returns <code>NULL</code> instead of raising an error.
Converts any Lua value at the given index to a C&nbsp;string
in a reasonable format.
The resulting string is pushed onto the stack and also
returned by the function.
returned by the function (see <a href="#4.1.3">&sect;4.1.3</a>).
If <code>len</code> is not <code>NULL</code>,
the function also sets <code>*len</code> with the string length.
@ -8001,9 +8060,11 @@ The default is "<code>bt</code>".
<p>
Lua does not check the consistency of binary chunks.
Maliciously crafted binary chunks can crash
the interpreter.
It is safe to load malformed binary chunks;
<code>load</code> signals an appropriate error.
However,
Lua does not check the consistency of the code inside binary chunks;
running maliciously crafted bytecode can crash the interpreter.
@ -8351,7 +8412,9 @@ that is,
closes all its pending to-be-closed variables
and puts the coroutine in a dead state.
The given coroutine must be dead or suspended.
In case of error closing some variable,
In case of error
(either the original error that stopped the coroutine or
errors in closing methods),
returns <b>false</b> plus the error object;
otherwise returns <b>true</b>.
@ -8665,6 +8728,18 @@ As such, it is only available on some platforms
plus other Unix systems that support the <code>dlfcn</code> standard).
<p>
This function is inherently insecure,
as it allows Lua to call any function in any readable dynamic
library in the system.
(Lua calls any function assuming the function
has a proper prototype and respects a proper protocol
(see <a href="#lua_CFunction"><code>lua_CFunction</code></a>).
Therefore,
calling an arbitrary function in an arbitrary dynamic library
more often than not results in an access violation.)
<p>
@ -9901,23 +9976,23 @@ from <code>list[1]</code> to <code>list[#list]</code>.
If <code>comp</code> is given,
then it must be a function that receives two list elements
and returns true when the first element must come
before the second in the final order
(so that, after the sort,
<code>i &lt; j</code> implies <code>not comp(list[j],list[i])</code>).
before the second in the final order,
so that, after the sort,
<code>i &lt;= j</code> implies <code>not comp(list[j],list[i])</code>.
If <code>comp</code> is not given,
then the standard Lua operator <code>&lt;</code> is used instead.
<p>
Note that the <code>comp</code> function must define
a strict partial order over the elements in the list;
that is, it must be asymmetric and transitive.
Otherwise, no valid sort may be possible.
The <code>comp</code> function must define a consistent order;
more formally, the function must define a strict weak order.
(A weak order is similar to a total order,
but it can equate different elements for comparison purposes.)
<p>
The sort algorithm is not stable:
elements considered equal by the given order
Different elements considered equal by the given order
may have their relative positions changed by the sort.
@ -11084,7 +11159,7 @@ which means the function running at level <code>f</code> of the call stack
of the given thread:
level&nbsp;0 is the current function (<code>getinfo</code> itself);
level&nbsp;1 is the function that called <code>getinfo</code>
(except for tail calls, which do not count on the stack);
(except for tail calls, which do not count in the stack);
and so on.
If <code>f</code> is a number greater than the number of active functions,
then <code>getinfo</code> returns <b>fail</b>.
@ -11218,43 +11293,6 @@ to the userdata <code>u</code> plus a boolean,
<p>
<hr><h3><a name="pdf-debug.setcstacklimit"><code>debug.setcstacklimit (limit)</code></a></h3>
<p>
Sets a new limit for the C stack.
This limit controls how deeply nested calls can go in Lua,
with the intent of avoiding a stack overflow.
A limit too small restricts recursive calls pointlessly;
a limit too large exposes the interpreter to stack-overflow crashes.
Unfortunately, there is no way to know a priori
the maximum safe limit for a platform.
<p>
Each call made from Lua code counts one unit.
Other operations (e.g., calls made from C to Lua or resuming a coroutine)
may have a higher cost.
<p>
This function has the following restrictions:
<ul>
<li>It can only be called from the main coroutine (thread);</li>
<li>It cannot be called while handling a stack-overflow error;</li>
<li><code>limit</code> must be less than 40000;</li>
<li><code>limit</code> cannot be less than the amount of C stack in use.</li>
</ul><p>
If a call does not respect some restriction,
it returns a false value.
Otherwise,
the call returns the old limit.
<p>
<hr><h3><a name="pdf-debug.sethook"><code>debug.sethook ([thread,] hook, mask [, count])</code></a></h3>
@ -11886,10 +11924,10 @@ and LiteralString, see <a href="#3.1">&sect;3.1</a>.)
<P CLASS="footer">
Last update:
Thu Jun 18 16:10:16 UTC 2020
Mon Mar 15 13:39:42 UTC 2021
</P>
<!--
Last change: revised for Lua 5.4.0 (final)
Last change: revised for Lua 5.4.3
-->
</body></html>

8
lua/doc/readme.html
View file

@ -110,7 +110,7 @@ Here are the details.
<OL>
<LI>
Open a terminal window and move to
the top-level directory, which is named <TT>lua-5.4.0</TT>.
the top-level directory, which is named <TT>lua-5.4.3</TT>.
The <TT>Makefile</TT> there controls both the build process and the installation process.
<P>
<LI>
@ -303,7 +303,7 @@ For details, see
<A HREF="http://www.lua.org/license.html">this</A>.
<BLOCKQUOTE STYLE="padding-bottom: 0em">
Copyright &copy; 1994&ndash;2020 Lua.org, PUC-Rio.
Copyright &copy; 1994&ndash;2021 Lua.org, PUC-Rio.
<P>
Permission is hereby granted, free of charge, to any person obtaining a copy
@ -330,10 +330,10 @@ THE SOFTWARE.
<P CLASS="footer">
Last update:
Fri May 1 19:33:31 UTC 2020
Wed Mar 3 10:16:26 UTC 2021
</P>
<!--
Last change: revised for Lua 5.4.0 (final)
Last change: revised for Lua 5.4.3
-->
</BODY>

15
lua/src/Makefile
View file

@ -7,7 +7,7 @@
PLAT= guess
CC= gcc -std=gnu99
CFLAGS= -O2 -Wall -Wextra $(SYSCFLAGS) $(MYCFLAGS)
CFLAGS= -O2 -Wall -Wextra -DLUA_COMPAT_5_3 $(SYSCFLAGS) $(MYCFLAGS)
LDFLAGS= $(SYSLDFLAGS) $(MYLDFLAGS)
LIBS= -lm $(SYSLIBS) $(MYLIBS)
@ -26,11 +26,11 @@ MYLIBS=
MYOBJS=
# Special flags for compiler modules; -Os reduces code size.
CMCFLAGS= -Os
CMCFLAGS=
# == END OF USER SETTINGS -- NO NEED TO CHANGE ANYTHING BELOW THIS LINE =======
PLATS= guess aix bsd c89 freebsd generic linux linux-readline macosx mingw posix posix32bit solaris
PLATS= guess aix bsd c89 freebsd generic linux linux-readline macosx mingw posix solaris
LUA_A= liblua.a
CORE_O= lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o lundump.o lvm.o lzio.o
@ -67,7 +67,7 @@ $(LUAC_T): $(LUAC_O) $(LUA_A)
$(CC) -o $@ $(LDFLAGS) $(LUAC_O) $(LUA_A) $(LIBS)
test:
./lua -v
./$(LUA_T) -v
clean:
$(RM) $(ALL_T) $(ALL_O)
@ -108,6 +108,8 @@ c89:
$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_C89" CC="gcc -std=c89"
@echo ''
@echo '*** C89 does not guarantee 64-bit integers for Lua.'
@echo '*** Make sure to compile all external Lua libraries'
@echo '*** with LUA_USE_C89 to ensure consistency'
@echo ''
FreeBSD NetBSD OpenBSD freebsd:
@ -133,10 +135,7 @@ mingw:
$(MAKE) "LUAC_T=luac.exe" luac.exe
posix:
$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -fPIC -DLUA_USE_DLOPEN" SYSLIBS="-ldl"
posix32bit:
$(MAKE) $(ALL) SYSCFLAGS="-m32 -DLUA_USE_POSIX -fPIC -DLUA_USE_DLOPEN" SYSLDFLAGS="-m32" SYSLIBS="-ldl"
$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX"
SunOS solaris:
$(MAKE) $(ALL) SYSCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN -D_REENTRANT" SYSLIBS="-ldl"

114
lua/src/lapi.c
View file

@ -39,7 +39,7 @@ const char lua_ident[] =
/*
** Test for a valid index.
** Test for a valid index (one that is not the 'nilvalue').
** '!ttisnil(o)' implies 'o != &G(L)->nilvalue', so it is not needed.
** However, it covers the most common cases in a faster way.
*/
@ -74,7 +74,8 @@ static TValue *index2value (lua_State *L, int idx) {
return &G(L)->nilvalue; /* it has no upvalues */
else {
CClosure *func = clCvalue(s2v(ci->func));
return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : &G(L)->nilvalue;
return (idx <= func->nupvalues) ? &func->upvalue[idx-1]
: &G(L)->nilvalue;
}
}
}
@ -97,8 +98,9 @@ static StkId index2stack (lua_State *L, int idx) {
LUA_API int lua_checkstack (lua_State *L, int n) {
int res;
CallInfo *ci = L->ci;
CallInfo *ci;
lua_lock(L);
ci = L->ci;
api_check(L, n >= 0, "negative 'n'");
if (L->stack_last - L->top > n) /* stack large enough? */
res = 1; /* yes; check is OK */
@ -170,10 +172,12 @@ LUA_API int lua_gettop (lua_State *L) {
LUA_API void lua_settop (lua_State *L, int idx) {
CallInfo *ci = L->ci;
StkId func = ci->func;
CallInfo *ci;
StkId func, newtop;
ptrdiff_t diff; /* difference for new top */
lua_lock(L);
ci = L->ci;
func = ci->func;
if (idx >= 0) {
api_check(L, idx <= ci->top - (func + 1), "new top too large");
diff = ((func + 1) + idx) - L->top;
@ -184,9 +188,26 @@ LUA_API void lua_settop (lua_State *L, int idx) {
api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
diff = idx + 1; /* will "subtract" index (as it is negative) */
}
if (diff < 0 && hastocloseCfunc(ci->nresults))
luaF_close(L, L->top + diff, LUA_OK);
L->top += diff; /* correct top only after closing any upvalue */
api_check(L, L->tbclist < L->top, "previous pop of an unclosed slot");
newtop = L->top + diff;
if (diff < 0 && L->tbclist >= newtop) {
lua_assert(hastocloseCfunc(ci->nresults));
luaF_close(L, newtop, CLOSEKTOP, 0);
}
L->top = newtop; /* correct top only after closing any upvalue */
lua_unlock(L);
}
LUA_API void lua_closeslot (lua_State *L, int idx) {
StkId level;
lua_lock(L);
level = index2stack(L, idx);
api_check(L, hastocloseCfunc(L->ci->nresults) && L->tbclist == level,
"no variable to close at given level");
luaF_close(L, level, CLOSEKTOP, 0);
level = index2stack(L, idx); /* stack may be moved */
setnilvalue(s2v(level));
lua_unlock(L);
}
@ -376,20 +397,22 @@ LUA_API int lua_toboolean (lua_State *L, int idx) {
LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
TValue *o = index2value(L, idx);
TValue *o;
lua_lock(L);
o = index2value(L, idx);
if (!ttisstring(o)) {
if (!cvt2str(o)) { /* not convertible? */
if (len != NULL) *len = 0;
lua_unlock(L);
return NULL;
}
lua_lock(L); /* 'luaO_tostring' may create a new string */
luaO_tostring(L, o);
luaC_checkGC(L);
o = index2value(L, idx); /* previous call may reallocate the stack */
lua_unlock(L);
}
if (len != NULL)
*len = vslen(o);
lua_unlock(L);
return svalue(o);
}
@ -563,6 +586,7 @@ LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
while (n--) {
setobj2n(L, &cl->upvalue[n], s2v(L->top + n));
/* does not need barrier because closure is white */
lua_assert(iswhite(cl));
}
setclCvalue(L, s2v(L->top), cl);
api_incr_top(L);
@ -623,10 +647,21 @@ static int auxgetstr (lua_State *L, const TValue *t, const char *k) {
}
/*
** Get the global table in the registry. Since all predefined
** indices in the registry were inserted right when the registry
** was created and never removed, they must always be in the array
** part of the registry.
*/
#define getGtable(L) \
(&hvalue(&G(L)->l_registry)->array[LUA_RIDX_GLOBALS - 1])
LUA_API int lua_getglobal (lua_State *L, const char *name) {
Table *reg = hvalue(&G(L)->l_registry);
const TValue *G;
lua_lock(L);
return auxgetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);
G = getGtable(L);
return auxgetstr(L, G, name);
}
@ -804,9 +839,10 @@ static void auxsetstr (lua_State *L, const TValue *t, const char *k) {
LUA_API void lua_setglobal (lua_State *L, const char *name) {
Table *reg = hvalue(&G(L)->l_registry);
const TValue *G;
lua_lock(L); /* unlock done in 'auxsetstr' */
auxsetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);
G = getGtable(L);
auxsetstr(L, G, name);
}
@ -853,12 +889,10 @@ LUA_API void lua_seti (lua_State *L, int idx, lua_Integer n) {
static void aux_rawset (lua_State *L, int idx, TValue *key, int n) {
Table *t;
TValue *slot;
lua_lock(L);
api_checknelems(L, n);
t = gettable(L, idx);
slot = luaH_set(L, t, key);
setobj2t(L, slot, s2v(L->top - 1));
luaH_set(L, t, key, s2v(L->top - 1));
invalidateTMcache(t);
luaC_barrierback(L, obj2gco(t), s2v(L->top - 1));
L->top -= n;
@ -1055,8 +1089,7 @@ LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
LClosure *f = clLvalue(s2v(L->top - 1)); /* get newly created function */
if (f->nupvalues >= 1) { /* does it have an upvalue? */
/* get global table from registry */
Table *reg = hvalue(&G(L)->l_registry);
const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
const TValue *gt = getGtable(L);
/* set global table as 1st upvalue of 'f' (may be LUA_ENV) */
setobj(L, f->upvals[0]->v, gt);
luaC_barrier(L, f->upvals[0], gt);
@ -1093,8 +1126,9 @@ LUA_API int lua_status (lua_State *L) {
LUA_API int lua_gc (lua_State *L, int what, ...) {
va_list argp;
int res = 0;
global_State *g = G(L);
global_State *g;
lua_lock(L);
g = G(L);
va_start(argp, what);
switch (what) {
case LUA_GCSTOP: {
@ -1194,9 +1228,15 @@ LUA_API int lua_gc (lua_State *L, int what, ...) {
LUA_API int lua_error (lua_State *L) {
TValue *errobj;
lua_lock(L);
errobj = s2v(L->top - 1);
api_checknelems(L, 1);
luaG_errormsg(L);
/* error object is the memory error message? */
if (ttisshrstring(errobj) && eqshrstr(tsvalue(errobj), G(L)->memerrmsg))
luaM_error(L); /* raise a memory error */
else
luaG_errormsg(L); /* raise a regular error */
/* code unreachable; will unlock when control actually leaves the kernel */
return 0; /* to avoid warnings */
}
@ -1225,8 +1265,7 @@ LUA_API void lua_toclose (lua_State *L, int idx) {
lua_lock(L);
o = index2stack(L, idx);
nresults = L->ci->nresults;
api_check(L, L->openupval == NULL || uplevel(L->openupval) <= o,
"marked index below or equal new one");
api_check(L, L->tbclist < o, "given index below or equal a marked one");
luaF_newtbcupval(L, o); /* create new to-be-closed upvalue */
if (!hastocloseCfunc(nresults)) /* function not marked yet? */
L->ci->nresults = codeNresults(nresults); /* mark it */
@ -1238,14 +1277,12 @@ LUA_API void lua_toclose (lua_State *L, int idx) {
LUA_API void lua_concat (lua_State *L, int n) {
lua_lock(L);
api_checknelems(L, n);
if (n >= 2) {
if (n > 0)
luaV_concat(L, n);
}
else if (n == 0) { /* push empty string */
setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
else { /* nothing to concatenate */
setsvalue2s(L, L->top, luaS_newlstr(L, "", 0)); /* push empty string */
api_incr_top(L);
}
/* else n == 1; nothing to do */
luaC_checkGC(L);
lua_unlock(L);
}
@ -1370,13 +1407,16 @@ LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {
static const UpVal *const nullup = NULL;
LClosure *f;
TValue *fi = index2value(L, fidx);
api_check(L, ttisLclosure(fi), "Lua function expected");
f = clLvalue(fi);
api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index");
if (pf) *pf = f;
return &f->upvals[n - 1]; /* get its upvalue pointer */
if (1 <= n && n <= f->p->sizeupvalues)
return &f->upvals[n - 1]; /* get its upvalue pointer */
else
return (UpVal**)&nullup;
}
@ -1388,11 +1428,14 @@ LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
}
case LUA_VCCL: { /* C closure */
CClosure *f = clCvalue(fi);
api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index");
return &f->upvalue[n - 1];
}
if (1 <= n && n <= f->nupvalues)
return &f->upvalue[n - 1];
/* else */
} /* FALLTHROUGH */
case LUA_VLCF:
return NULL; /* light C functions have no upvalues */
default: {
api_check(L, 0, "closure expected");
api_check(L, 0, "function expected");
return NULL;
}
}
@ -1404,6 +1447,7 @@ LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
LClosure *f1;
UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
api_check(L, *up1 != NULL && *up2 != NULL, "invalid upvalue index");
*up1 = *up2;
luaC_objbarrier(L, f1, *up1);
}

2
lua/src/lapi.h
View file

@ -42,6 +42,8 @@
#define hastocloseCfunc(n) ((n) < LUA_MULTRET)
/* Map [-1, inf) (range of 'nresults') into (-inf, -2] */
#define codeNresults(n) (-(n) - 3)
#define decodeNresults(n) (-(n) - 3)
#endif

150
lua/src/lauxlib.c
View file

@ -190,7 +190,7 @@ LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
}
int luaL_typeerror (lua_State *L, int arg, const char *tname) {
LUALIB_API int luaL_typeerror (lua_State *L, int arg, const char *tname) {
const char *msg;
const char *typearg; /* name for the type of the actual argument */
if (luaL_getmetafield(L, arg, "__name") == LUA_TSTRING)
@ -283,10 +283,10 @@ LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
LUALIB_API int luaL_execresult (lua_State *L, int stat) {
const char *what = "exit"; /* type of termination */
if (stat != 0 && errno != 0) /* error with an 'errno'? */
return luaL_fileresult(L, 0, NULL);
else {
const char *what = "exit"; /* type of termination */
l_inspectstat(stat, what); /* interpret result */
if (*what == 'e' && stat == 0) /* successful termination? */
lua_pushboolean(L, 1);
@ -378,7 +378,7 @@ LUALIB_API int luaL_checkoption (lua_State *L, int arg, const char *def,
** but without 'msg'.)
*/
LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
if (!lua_checkstack(L, space)) {
if (l_unlikely(!lua_checkstack(L, space))) {
if (msg)
luaL_error(L, "stack overflow (%s)", msg);
else
@ -388,20 +388,20 @@ LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
LUALIB_API void luaL_checktype (lua_State *L, int arg, int t) {
if (lua_type(L, arg) != t)
if (l_unlikely(lua_type(L, arg) != t))
tag_error(L, arg, t);
}
LUALIB_API void luaL_checkany (lua_State *L, int arg) {
if (lua_type(L, arg) == LUA_TNONE)
if (l_unlikely(lua_type(L, arg) == LUA_TNONE))
luaL_argerror(L, arg, "value expected");
}
LUALIB_API const char *luaL_checklstring (lua_State *L, int arg, size_t *len) {
const char *s = lua_tolstring(L, arg, len);
if (!s) tag_error(L, arg, LUA_TSTRING);
if (l_unlikely(!s)) tag_error(L, arg, LUA_TSTRING);
return s;
}
@ -420,7 +420,7 @@ LUALIB_API const char *luaL_optlstring (lua_State *L, int arg,
LUALIB_API lua_Number luaL_checknumber (lua_State *L, int arg) {
int isnum;
lua_Number d = lua_tonumberx(L, arg, &isnum);
if (!isnum)
if (l_unlikely(!isnum))
tag_error(L, arg, LUA_TNUMBER);
return d;
}
@ -442,7 +442,7 @@ static void interror (lua_State *L, int arg) {
LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int arg) {
int isnum;
lua_Integer d = lua_tointegerx(L, arg, &isnum);
if (!isnum) {
if (l_unlikely(!isnum)) {
interror(L, arg);
}
return d;
@ -475,8 +475,10 @@ static void *resizebox (lua_State *L, int idx, size_t newsize) {
lua_Alloc allocf = lua_getallocf(L, &ud);
UBox *box = (UBox *)lua_touserdata(L, idx);
void *temp = allocf(ud, box->box, box->bsize, newsize);
if (temp == NULL && newsize > 0) /* allocation error? */
luaL_error(L, "not enough memory");
if (l_unlikely(temp == NULL && newsize > 0)) { /* allocation error? */
lua_pushliteral(L, "not enough memory");
lua_error(L); /* raise a memory error */
}
box->box = temp;
box->bsize = newsize;
return temp;
@ -513,13 +515,22 @@ static void newbox (lua_State *L) {
#define buffonstack(B) ((B)->b != (B)->init.b)
/*
** Whenever buffer is accessed, slot 'idx' must either be a box (which
** cannot be NULL) or it is a placeholder for the buffer.
*/
#define checkbufferlevel(B,idx) \
lua_assert(buffonstack(B) ? lua_touserdata(B->L, idx) != NULL \
: lua_touserdata(B->L, idx) == (void*)B)
/*
** Compute new size for buffer 'B', enough to accommodate extra 'sz'
** bytes.
*/
static size_t newbuffsize (luaL_Buffer *B, size_t sz) {
size_t newsize = B->size * 2; /* double buffer size */
if (MAX_SIZET - sz < B->n) /* overflow in (B->n + sz)? */
if (l_unlikely(MAX_SIZET - sz < B->n)) /* overflow in (B->n + sz)? */
return luaL_error(B->L, "buffer too large");
if (newsize < B->n + sz) /* double is not big enough? */
newsize = B->n + sz;
@ -529,10 +540,11 @@ static size_t newbuffsize (luaL_Buffer *B, size_t sz) {
/*
** Returns a pointer to a free area with at least 'sz' bytes in buffer
** 'B'. 'boxidx' is the relative position in the stack where the
** buffer's box is or should be.
** 'B'. 'boxidx' is the relative position in the stack where is the
** buffer's box or its placeholder.
*/
static char *prepbuffsize (luaL_Buffer *B, size_t sz, int boxidx) {
checkbufferlevel(B, boxidx);
if (B->size - B->n >= sz) /* enough space? */
return B->b + B->n;
else {
@ -543,10 +555,9 @@ static char *prepbuffsize (luaL_Buffer *B, size_t sz, int boxidx) {
if (buffonstack(B)) /* buffer already has a box? */
newbuff = (char *)resizebox(L, boxidx, newsize); /* resize it */
else { /* no box yet */
lua_pushnil(L); /* reserve slot for final result */
lua_remove(L, boxidx); /* remove placeholder */
newbox(L); /* create a new box */
/* move box (and slot) to its intended position */
lua_rotate(L, boxidx - 1, 2);
lua_insert(L, boxidx); /* move box to its intended position */
lua_toclose(L, boxidx);
newbuff = (char *)resizebox(L, boxidx, newsize);
memcpy(newbuff, B->b, B->n * sizeof(char)); /* copy original content */
@ -581,11 +592,11 @@ LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
lua_State *L = B->L;
checkbufferlevel(B, -1);
lua_pushlstring(L, B->b, B->n);
if (buffonstack(B)) {
lua_copy(L, -1, -3); /* move string to reserved slot */
lua_pop(L, 2); /* pop string and box (closing the box) */
}
if (buffonstack(B))
lua_closeslot(L, -2); /* close the box */
lua_remove(L, -2); /* remove box or placeholder from the stack */
}
@ -620,6 +631,7 @@ LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
B->b = B->init.b;
B->n = 0;
B->size = LUAL_BUFFERSIZE;
lua_pushlightuserdata(L, (void*)B); /* push placeholder */
}
@ -637,10 +649,14 @@ LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {
** =======================================================
*/
/* index of free-list header */
#define freelist 0
/* index of free-list header (after the predefined values) */
#define freelist (LUA_RIDX_LAST + 1)
/*
** The previously freed references form a linked list:
** t[freelist] is the index of a first free index, or zero if list is
** empty; t[t[freelist]] is the index of the second element; etc.
*/
LUALIB_API int luaL_ref (lua_State *L, int t) {
int ref;
if (lua_isnil(L, -1)) {
@ -648,9 +664,16 @@ LUALIB_API int luaL_ref (lua_State *L, int t) {
return LUA_REFNIL; /* 'nil' has a unique fixed reference */
}
t = lua_absindex(L, t);
lua_rawgeti(L, t, freelist); /* get first free element */
ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
lua_pop(L, 1); /* remove it from stack */
if (lua_rawgeti(L, t, freelist) == LUA_TNIL) { /* first access? */
ref = 0; /* list is empty */
lua_pushinteger(L, 0); /* initialize as an empty list */
lua_rawseti(L, t, freelist); /* ref = t[freelist] = 0 */
}
else { /* already initialized */
lua_assert(lua_isinteger(L, -1));
ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
}
lua_pop(L, 1); /* remove element from stack */
if (ref != 0) { /* any free element? */
lua_rawgeti(L, t, ref); /* remove it from list */
lua_rawseti(L, t, freelist); /* (t[freelist] = t[ref]) */
@ -666,6 +689,7 @@ LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
if (ref >= 0) {
t = lua_absindex(L, t);
lua_rawgeti(L, t, freelist);
lua_assert(lua_isinteger(L, -1));
lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */
lua_pushinteger(L, ref);
lua_rawseti(L, t, freelist); /* t[freelist] = ref */
@ -849,7 +873,7 @@ LUALIB_API lua_Integer luaL_len (lua_State *L, int idx) {
int isnum;
lua_len(L, idx);
l = lua_tointegerx(L, -1, &isnum);
if (!isnum)
if (l_unlikely(!isnum))
luaL_error(L, "object length is not an integer");
lua_pop(L, 1); /* remove object */
return l;
@ -1004,43 +1028,67 @@ static int panic (lua_State *L) {
/*
** Emit a warning. '*warnstate' means:
** 0 - warning system is off;
** 1 - ready to start a new message;
** 2 - previous message is to be continued.
** Warning functions:
** warnfoff: warning system is off
** warnfon: ready to start a new message
** warnfcont: previous message is to be continued
*/
static void warnf (void *ud, const char *message, int tocont) {
int *warnstate = (int *)ud;
if (*warnstate != 2 && !tocont && *message == '@') { /* control message? */
if (strcmp(message, "@off") == 0)
*warnstate = 0;
else if (strcmp(message, "@on") == 0)
*warnstate = 1;
return;
static void warnfoff (void *ud, const char *message, int tocont);
static void warnfon (void *ud, const char *message, int tocont);
static void warnfcont (void *ud, const char *message, int tocont);
/*
** Check whether message is a control message. If so, execute the
** control or ignore it if unknown.
*/
static int checkcontrol (lua_State *L, const char *message, int tocont) {
if (tocont || *(message++) != '@') /* not a control message? */
return 0;
else {
if (strcmp(message, "off") == 0)
lua_setwarnf(L, warnfoff, L); /* turn warnings off */
else if (strcmp(message, "on") == 0)
lua_setwarnf(L, warnfon, L); /* turn warnings on */
return 1; /* it was a control message */
}
else if (*warnstate == 0) /* warnings off? */
return;
if (*warnstate == 1) /* previous message was the last? */
lua_writestringerror("%s", "Lua warning: "); /* start a new warning */
}
static void warnfoff (void *ud, const char *message, int tocont) {
checkcontrol((lua_State *)ud, message, tocont);
}
/*
** Writes the message and handle 'tocont', finishing the message
** if needed and setting the next warn function.
*/
static void warnfcont (void *ud, const char *message, int tocont) {
lua_State *L = (lua_State *)ud;
lua_writestringerror("%s", message); /* write message */
if (tocont) /* not the last part? */
*warnstate = 2; /* to be continued */
lua_setwarnf(L, warnfcont, L); /* to be continued */
else { /* last part */
lua_writestringerror("%s", "\n"); /* finish message with end-of-line */
*warnstate = 1; /* ready to start a new message */
lua_setwarnf(L, warnfon, L); /* next call is a new message */
}
}
static void warnfon (void *ud, const char *message, int tocont) {
if (checkcontrol((lua_State *)ud, message, tocont)) /* control message? */
return; /* nothing else to be done */
lua_writestringerror("%s", "Lua warning: "); /* start a new warning */
warnfcont(ud, message, tocont); /* finish processing */
}
LUALIB_API lua_State *luaL_newstate (void) {
lua_State *L = lua_newstate(l_alloc, NULL);
if (L) {
int *warnstate; /* space for warning state */
if (l_likely(L)) {
lua_atpanic(L, &panic);
warnstate = (int *)lua_newuserdatauv(L, sizeof(int), 0);
luaL_ref(L, LUA_REGISTRYINDEX); /* make sure it won't be collected */
*warnstate = 0; /* default is warnings off */
lua_setwarnf(L, warnf, warnstate);
lua_setwarnf(L, warnfoff, L); /* default is warnings off */
}
return L;
}

21
lua/src/lauxlib.h
View file

@ -12,6 +12,7 @@
#include <stddef.h>
#include <stdio.h>
#include "luaconf.h"
#include "lua.h"
@ -130,10 +131,10 @@ LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
(luaL_checkversion(L), luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))
#define luaL_argcheck(L, cond,arg,extramsg) \
((void)((cond) || luaL_argerror(L, (arg), (extramsg))))
((void)(luai_likely(cond) || luaL_argerror(L, (arg), (extramsg))))
#define luaL_argexpected(L,cond,arg,tname) \
((void)((cond) || luaL_typeerror(L, (arg), (tname))))
((void)(luai_likely(cond) || luaL_typeerror(L, (arg), (tname))))
#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
#define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL))
@ -157,6 +158,22 @@ LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
#define luaL_pushfail(L) lua_pushnil(L)
/*
** Internal assertions for in-house debugging
*/
#if !defined(lua_assert)
#if defined LUAI_ASSERT
#include <assert.h>
#define lua_assert(c) assert(c)
#else
#define lua_assert(c) ((void)0)
#endif
#endif
/*
** {======================================================
** Generic Buffer manipulation

15
lua/src/lbaselib.c
View file

@ -138,7 +138,7 @@ static int luaB_setmetatable (lua_State *L) {
int t = lua_type(L, 2);
luaL_checktype(L, 1, LUA_TTABLE);
luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");
if (luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL)
if (l_unlikely(luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL))
return luaL_error(L, "cannot change a protected metatable");
lua_settop(L, 2);
lua_setmetatable(L, 1);
@ -182,7 +182,8 @@ static int luaB_rawset (lua_State *L) {
static int pushmode (lua_State *L, int oldmode) {
lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental" : "generational");
lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental"
: "generational");
return 1;
}
@ -299,7 +300,7 @@ static int luaB_ipairs (lua_State *L) {
static int load_aux (lua_State *L, int status, int envidx) {
if (status == LUA_OK) {
if (l_likely(status == LUA_OK)) {
if (envidx != 0) { /* 'env' parameter? */
lua_pushvalue(L, envidx); /* environment for loaded function */
if (!lua_setupvalue(L, -2, 1)) /* set it as 1st upvalue */
@ -355,7 +356,7 @@ static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
*size = 0;
return NULL;
}
else if (!lua_isstring(L, -1))
else if (l_unlikely(!lua_isstring(L, -1)))
luaL_error(L, "reader function must return a string");
lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */
return lua_tolstring(L, RESERVEDSLOT, size);
@ -393,7 +394,7 @@ static int dofilecont (lua_State *L, int d1, lua_KContext d2) {
static int luaB_dofile (lua_State *L) {
const char *fname = luaL_optstring(L, 1, NULL);
lua_settop(L, 1);
if (luaL_loadfile(L, fname) != LUA_OK)
if (l_unlikely(luaL_loadfile(L, fname) != LUA_OK))
return lua_error(L);
lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
return dofilecont(L, 0, 0);
@ -401,7 +402,7 @@ static int luaB_dofile (lua_State *L) {
static int luaB_assert (lua_State *L) {
if (lua_toboolean(L, 1)) /* condition is true? */
if (l_likely(lua_toboolean(L, 1))) /* condition is true? */
return lua_gettop(L); /* return all arguments */
else { /* error */
luaL_checkany(L, 1); /* there must be a condition */
@ -437,7 +438,7 @@ static int luaB_select (lua_State *L) {
** ignored).
*/
static int finishpcall (lua_State *L, int status, lua_KContext extra) {
if (status != LUA_OK && status != LUA_YIELD) { /* error? */
if (l_unlikely(status != LUA_OK && status != LUA_YIELD)) { /* error? */
lua_pushboolean(L, 0); /* first result (false) */
lua_pushvalue(L, -2); /* error message */
return 2; /* return false, msg */

44
lua/src/lcode.c
View file

@ -314,15 +314,6 @@ void luaK_patchtohere (FuncState *fs, int list) {
}
/*
** MAXimum number of successive Instructions WiTHout ABSolute line
** information.
*/
#if !defined(MAXIWTHABS)
#define MAXIWTHABS 120
#endif
/* limit for difference between lines in relative line info. */
#define LIMLINEDIFF 0x80
@ -337,13 +328,13 @@ void luaK_patchtohere (FuncState *fs, int list) {
static void savelineinfo (FuncState *fs, Proto *f, int line) {
int linedif = line - fs->previousline;
int pc = fs->pc - 1; /* last instruction coded */
if (abs(linedif) >= LIMLINEDIFF || fs->iwthabs++ > MAXIWTHABS) {
if (abs(linedif) >= LIMLINEDIFF || fs->iwthabs++ >= MAXIWTHABS) {
luaM_growvector(fs->ls->L, f->abslineinfo, fs->nabslineinfo,
f->sizeabslineinfo, AbsLineInfo, MAX_INT, "lines");
f->abslineinfo[fs->nabslineinfo].pc = pc;
f->abslineinfo[fs->nabslineinfo++].line = line;
linedif = ABSLINEINFO; /* signal that there is absolute information */
fs->iwthabs = 0; /* restart counter */
fs->iwthabs = 1; /* restart counter */
}
luaM_growvector(fs->ls->L, f->lineinfo, pc, f->sizelineinfo, ls_byte,
MAX_INT, "opcodes");
@ -545,11 +536,14 @@ static void freeexps (FuncState *fs, expdesc *e1, expdesc *e2) {
** and try to reuse constants. Because some values should not be used
** as keys (nil cannot be a key, integer keys can collapse with float
** keys), the caller must provide a useful 'key' for indexing the cache.
** Note that all functions share the same table, so entering or exiting
** a function can make some indices wrong.
*/
static int addk (FuncState *fs, TValue *key, TValue *v) {
TValue val;
lua_State *L = fs->ls->L;
Proto *f = fs->f;
TValue *idx = luaH_set(L, fs->ls->h, key); /* index scanner table */
const TValue *idx = luaH_get(fs->ls->h, key); /* query scanner table */
int k, oldsize;
if (ttisinteger(idx)) { /* is there an index there? */
k = cast_int(ivalue(idx));
@ -563,7 +557,8 @@ static int addk (FuncState *fs, TValue *key, TValue *v) {
k = fs->nk;
/* numerical value does not need GC barrier;
table has no metatable, so it does not need to invalidate cache */
setivalue(idx, k);
setivalue(&val, k);
luaH_finishset(L, fs->ls->h, key, idx, &val);
luaM_growvector(L, f->k, k, f->sizek, TValue, MAXARG_Ax, "constants");
while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
setobj(L, &f->k[k], v);
@ -753,7 +748,7 @@ void luaK_setoneret (FuncState *fs, expdesc *e) {
/*
** Ensure that expression 'e' is not a variable (nor a constant).
** Ensure that expression 'e' is not a variable (nor a <const>).
** (Expression still may have jump lists.)
*/
void luaK_dischargevars (FuncState *fs, expdesc *e) {
@ -763,7 +758,7 @@ void luaK_dischargevars (FuncState *fs, expdesc *e) {
break;
}
case VLOCAL: { /* already in a register */
e->u.info = e->u.var.sidx;
e->u.info = e->u.var.ridx;
e->k = VNONRELOC; /* becomes a non-relocatable value */
break;
}
@ -805,8 +800,8 @@ void luaK_dischargevars (FuncState *fs, expdesc *e) {
/*
** Ensures expression value is in register 'reg' (and therefore
** 'e' will become a non-relocatable expression).
** Ensure expression value is in register 'reg', making 'e' a
** non-relocatable expression.
** (Expression still may have jump lists.)
*/
static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
@ -860,7 +855,8 @@ static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
/*
** Ensures expression value is in any register.
** Ensure expression value is in a register, making 'e' a
** non-relocatable expression.
** (Expression still may have jump lists.)
*/
static void discharge2anyreg (FuncState *fs, expdesc *e) {
@ -946,8 +942,11 @@ int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
exp2reg(fs, e, e->u.info); /* put final result in it */
return e->u.info;
}
/* else expression has jumps and cannot change its register
to hold the jump values, because it is a local variable.
Go through to the default case. */
}
luaK_exp2nextreg(fs, e); /* otherwise, use next available register */
luaK_exp2nextreg(fs, e); /* default: use next available register */
return e->u.info;
}
@ -1032,7 +1031,7 @@ void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) {
switch (var->k) {
case VLOCAL: {
freeexp(fs, ex);
exp2reg(fs, ex, var->u.var.sidx); /* compute 'ex' into proper place */
exp2reg(fs, ex, var->u.var.ridx); /* compute 'ex' into proper place */
return;
}
case VUPVAL: {
@ -1272,7 +1271,7 @@ void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
}
else {
/* register index of the table */
t->u.ind.t = (t->k == VLOCAL) ? t->u.var.sidx: t->u.info;
t->u.ind.t = (t->k == VLOCAL) ? t->u.var.ridx: t->u.info;
if (isKstr(fs, k)) {
t->u.ind.idx = k->u.info; /* literal string */
t->k = VINDEXSTR;
@ -1299,7 +1298,8 @@ static int validop (int op, TValue *v1, TValue *v2) {
case LUA_OPBAND: case LUA_OPBOR: case LUA_OPBXOR:
case LUA_OPSHL: case LUA_OPSHR: case LUA_OPBNOT: { /* conversion errors */
lua_Integer i;
return (tointegerns(v1, &i) && tointegerns(v2, &i));
return (luaV_tointegerns(v1, &i, LUA_FLOORN2I) &&
luaV_tointegerns(v2, &i, LUA_FLOORN2I));
}
case LUA_OPDIV: case LUA_OPIDIV: case LUA_OPMOD: /* division by 0 */
return (nvalue(v2) != 0);

20
lua/src/lcorolib.c
View file

@ -31,14 +31,14 @@ static lua_State *getco (lua_State *L) {
*/
static int auxresume (lua_State *L, lua_State *co, int narg) {
int status, nres;
if (!lua_checkstack(co, narg)) {
if (l_unlikely(!lua_checkstack(co, narg))) {
lua_pushliteral(L, "too many arguments to resume");
return -1; /* error flag */
}
lua_xmove(L, co, narg);
status = lua_resume(co, L, narg, &nres);
if (status == LUA_OK || status == LUA_YIELD) {
if (!lua_checkstack(L, nres + 1)) {
if (l_likely(status == LUA_OK || status == LUA_YIELD)) {
if (l_unlikely(!lua_checkstack(L, nres + 1))) {
lua_pop(co, nres); /* remove results anyway */
lua_pushliteral(L, "too many results to resume");
return -1; /* error flag */
@ -57,7 +57,7 @@ static int luaB_coresume (lua_State *L) {
lua_State *co = getco(L);
int r;
r = auxresume(L, co, lua_gettop(L) - 1);
if (r < 0) {
if (l_unlikely(r < 0)) {
lua_pushboolean(L, 0);
lua_insert(L, -2);
return 2; /* return false + error message */
@ -73,11 +73,15 @@ static int luaB_coresume (lua_State *L) {
static int luaB_auxwrap (lua_State *L) {
lua_State *co = lua_tothread(L, lua_upvalueindex(1));
int r = auxresume(L, co, lua_gettop(L));
if (r < 0) {
if (l_unlikely(r < 0)) { /* error? */
int stat = lua_status(co);
if (stat != LUA_OK && stat != LUA_YIELD)
lua_resetthread(co); /* close variables in case of errors */
if (lua_type(L, -1) == LUA_TSTRING) { /* error object is a string? */
if (stat != LUA_OK && stat != LUA_YIELD) { /* error in the coroutine? */
stat = lua_resetthread(co); /* close its tbc variables */
lua_assert(stat != LUA_OK);
lua_xmove(co, L, 1); /* copy error message */
}
if (stat != LUA_ERRMEM && /* not a memory error and ... */
lua_type(L, -1) == LUA_TSTRING) { /* ... error object is a string? */
luaL_where(L, 1); /* add extra info, if available */
lua_insert(L, -2);
lua_concat(L, 2);

14
lua/src/lctype.h
View file

@ -13,7 +13,7 @@
/*
** WARNING: the functions defined here do not necessarily correspond
** to the similar functions in the standard C ctype.h. They are
** optimized for the specific needs of Lua
** optimized for the specific needs of Lua.
*/
#if !defined(LUA_USE_CTYPE)
@ -61,13 +61,19 @@
#define lisprint(c) testprop(c, MASK(PRINTBIT))
#define lisxdigit(c) testprop(c, MASK(XDIGITBIT))
/*
** this 'ltolower' only works for alphabetic characters
** In ASCII, this 'ltolower' is correct for alphabetic characters and
** for '.'. That is enough for Lua needs. ('check_exp' ensures that
** the character either is an upper-case letter or is unchanged by
** the transformation, which holds for lower-case letters and '.'.)
*/
#define ltolower(c) ((c) | ('A' ^ 'a'))
#define ltolower(c) \
check_exp(('A' <= (c) && (c) <= 'Z') || (c) == ((c) | ('A' ^ 'a')), \
(c) | ('A' ^ 'a'))
/* two more entries for 0 and -1 (EOZ) */
/* one entry for each character and for -1 (EOZ) */
LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];)

40
lua/src/ldblib.c
View file

@ -33,7 +33,7 @@ static const char *const HOOKKEY = "_HOOKKEY";
** checked.
*/
static void checkstack (lua_State *L, lua_State *L1, int n) {
if (L != L1 && !lua_checkstack(L1, n))
if (l_unlikely(L != L1 && !lua_checkstack(L1, n)))
luaL_error(L, "stack overflow");
}
@ -152,6 +152,7 @@ static int db_getinfo (lua_State *L) {
lua_State *L1 = getthread(L, &arg);
const char *options = luaL_optstring(L, arg+2, "flnSrtu");
checkstack(L, L1, 3);
luaL_argcheck(L, options[0] != '>', arg + 2, "invalid option '>'");
if (lua_isfunction(L, arg + 1)) { /* info about a function? */
options = lua_pushfstring(L, ">%s", options); /* add '>' to 'options' */
lua_pushvalue(L, arg + 1); /* move function to 'L1' stack */
@ -212,7 +213,7 @@ static int db_getlocal (lua_State *L) {
lua_Debug ar;
const char *name;
int level = (int)luaL_checkinteger(L, arg + 1);
if (!lua_getstack(L1, level, &ar)) /* out of range? */
if (l_unlikely(!lua_getstack(L1, level, &ar))) /* out of range? */
return luaL_argerror(L, arg+1, "level out of range");
checkstack(L, L1, 1);
name = lua_getlocal(L1, &ar, nvar);
@ -237,7 +238,7 @@ static int db_setlocal (lua_State *L) {
lua_Debug ar;
int level = (int)luaL_checkinteger(L, arg + 1);
int nvar = (int)luaL_checkinteger(L, arg + 2);
if (!lua_getstack(L1, level, &ar)) /* out of range? */
if (l_unlikely(!lua_getstack(L1, level, &ar))) /* out of range? */
return luaL_argerror(L, arg+1, "level out of range");
luaL_checkany(L, arg+3);
lua_settop(L, arg+3);
@ -281,25 +282,33 @@ static int db_setupvalue (lua_State *L) {
** Check whether a given upvalue from a given closure exists and
** returns its index
*/
static int checkupval (lua_State *L, int argf, int argnup) {
static void *checkupval (lua_State *L, int argf, int argnup, int *pnup) {
void *id;
int nup = (int)luaL_checkinteger(L, argnup); /* upvalue index */
luaL_checktype(L, argf, LUA_TFUNCTION); /* closure */
luaL_argcheck(L, (lua_getupvalue(L, argf, nup) != NULL), argnup,
"invalid upvalue index");
return nup;
id = lua_upvalueid(L, argf, nup);
if (pnup) {
luaL_argcheck(L, id != NULL, argnup, "invalid upvalue index");
*pnup = nup;
}
return id;
}
static int db_upvalueid (lua_State *L) {
int n = checkupval(L, 1, 2);
lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));
void *id = checkupval(L, 1, 2, NULL);
if (id != NULL)
lua_pushlightuserdata(L, id);
else
luaL_pushfail(L);
return 1;
}
static int db_upvaluejoin (lua_State *L) {
int n1 = checkupval(L, 1, 2);
int n2 = checkupval(L, 3, 4);
int n1, n2;
checkupval(L, 1, 2, &n1);
checkupval(L, 3, 4, &n2);
luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");
luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");
lua_upvaluejoin(L, 1, n1, 3, n2);
@ -369,7 +378,7 @@ static int db_sethook (lua_State *L) {
}
if (!luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY)) {
/* table just created; initialize it */
lua_pushstring(L, "k");
lua_pushliteral(L, "k");
lua_setfield(L, -2, "__mode"); /** hooktable.__mode = "k" */
lua_pushvalue(L, -1);
lua_setmetatable(L, -2); /* metatable(hooktable) = hooktable */
@ -412,7 +421,7 @@ static int db_debug (lua_State *L) {
for (;;) {
char buffer[250];
lua_writestringerror("%s", "lua_debug> ");
if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
if (fgets(buffer, sizeof(buffer), stdin) == NULL ||
strcmp(buffer, "cont\n") == 0)
return 0;
if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
@ -440,10 +449,7 @@ static int db_traceback (lua_State *L) {
static int db_setcstacklimit (lua_State *L) {
int limit = (int)luaL_checkinteger(L, 1);
int res = lua_setcstacklimit(L, limit);
if (res == 0)
lua_pushboolean(L, 0);
else
lua_pushinteger(L, res);
lua_pushinteger(L, res);
return 1;
}

156
lua/src/ldebug.c
View file

@ -34,10 +34,6 @@
#define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_VCCL)
/* Active Lua function (given call info) */
#define ci_func(ci) (clLvalue(s2v((ci)->func)))
static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
const char **name);
@ -50,10 +46,16 @@ static int currentpc (CallInfo *ci) {
/*
** Get a "base line" to find the line corresponding to an instruction.
** For that, search the array of absolute line info for the largest saved
** instruction smaller or equal to the wanted instruction. A special
** case is when there is no absolute info or the instruction is before
** the first absolute one.
** Base lines are regularly placed at MAXIWTHABS intervals, so usually
** an integer division gets the right place. When the source file has
** large sequences of empty/comment lines, it may need extra entries,
** so the original estimate needs a correction.
** If the original estimate is -1, the initial 'if' ensures that the
** 'while' will run at least once.
** The assertion that the estimate is a lower bound for the correct base
** is valid as long as the debug info has been generated with the same
** value for MAXIWTHABS or smaller. (Previous releases use a little
** smaller value.)
*/
static int getbaseline (const Proto *f, int pc, int *basepc) {
if (f->sizeabslineinfo == 0 || pc < f->abslineinfo[0].pc) {
@ -61,20 +63,12 @@ static int getbaseline (const Proto *f, int pc, int *basepc) {
return f->linedefined;
}
else {
unsigned int i;
if (pc >= f->abslineinfo[f->sizeabslineinfo - 1].pc)
i = f->sizeabslineinfo - 1; /* instruction is after last saved one */
else { /* binary search */
unsigned int j = f->sizeabslineinfo - 1; /* pc < anchorlines[j] */
i = 0; /* abslineinfo[i] <= pc */
while (i < j - 1) {
unsigned int m = (j + i) / 2;
if (pc >= f->abslineinfo[m].pc)
i = m;
else
j = m;
}
}
int i = cast_uint(pc) / MAXIWTHABS - 1; /* get an estimate */
/* estimate must be a lower bond of the correct base */
lua_assert(i < 0 ||
(i < f->sizeabslineinfo && f->abslineinfo[i].pc <= pc));
while (i + 1 < f->sizeabslineinfo && pc >= f->abslineinfo[i + 1].pc)
i++; /* low estimate; adjust it */
*basepc = f->abslineinfo[i].pc;
return f->abslineinfo[i].line;
}
@ -127,20 +121,18 @@ static void settraps (CallInfo *ci) {
/*
** This function can be called during a signal, under "reasonable"
** assumptions.
** Fields 'oldpc', 'basehookcount', and 'hookcount' (set by
** 'resethookcount') are for debug only, and it is no problem if they
** get arbitrary values (causes at most one wrong hook call). 'hookmask'
** is an atomic value. We assume that pointers are atomic too (e.g., gcc
** ensures that for all platforms where it runs). Moreover, 'hook' is
** always checked before being called (see 'luaD_hook').
** Fields 'basehookcount' and 'hookcount' (set by 'resethookcount')
** are for debug only, and it is no problem if they get arbitrary
** values (causes at most one wrong hook call). 'hookmask' is an atomic
** value. We assume that pointers are atomic too (e.g., gcc ensures that
** for all platforms where it runs). Moreover, 'hook' is always checked
** before being called (see 'luaD_hook').
*/
LUA_API void lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
if (func == NULL || mask == 0) { /* turn off hooks? */
mask = 0;
func = NULL;
}
if (isLua(L->ci))
L->oldpc = L->ci->u.l.savedpc;
L->hook = func;
L->basehookcount = count;
resethookcount(L);
@ -192,8 +184,8 @@ static const char *upvalname (const Proto *p, int uv) {
static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
if (clLvalue(s2v(ci->func))->p->is_vararg) {
int nextra = ci->u.l.nextraargs;
if (n <= nextra) {
*pos = ci->func - nextra + (n - 1);
if (n >= -nextra) { /* 'n' is negative */
*pos = ci->func - nextra - (n + 1);
return "(vararg)"; /* generic name for any vararg */
}
}
@ -206,7 +198,7 @@ const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n, StkId *pos) {
const char *name = NULL;
if (isLua(ci)) {
if (n < 0) /* access to vararg values? */
return findvararg(ci, -n, pos);
return findvararg(ci, n, pos);
else
name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
}
@ -309,8 +301,8 @@ static void collectvalidlines (lua_State *L, Closure *f) {
sethvalue2s(L, L->top, t); /* push it on stack */
api_incr_top(L);
setbtvalue(&v); /* boolean 'true' to be the value of all indices */
for (i = 0; i < p->sizelineinfo; i++) { /* for all lines with code */
currentline = nextline(p, currentline, i);
for (i = 0; i < p->sizelineinfo; i++) { /* for all instructions */
currentline = nextline(p, currentline, i); /* get its line */
luaH_setint(L, t, currentline, &v); /* table[line] = true */
}
}
@ -633,12 +625,10 @@ static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
case OP_LEN: tm = TM_LEN; break;
case OP_CONCAT: tm = TM_CONCAT; break;
case OP_EQ: tm = TM_EQ; break;
case OP_LT: case OP_LE: case OP_LTI: case OP_LEI:
*name = "order"; /* '<=' can call '__lt', etc. */
return "metamethod";
case OP_CLOSE: case OP_RETURN:
*name = "close";
return "metamethod";
/* no cases for OP_EQI and OP_EQK, as they don't call metamethods */
case OP_LT: case OP_LTI: case OP_GTI: tm = TM_LT; break;
case OP_LE: case OP_LEI: case OP_GEI: tm = TM_LE; break;
case OP_CLOSE: case OP_RETURN: tm = TM_CLOSE; break;
default:
return NULL; /* cannot find a reasonable name */
}
@ -651,14 +641,18 @@ static const char *funcnamefromcode (lua_State *L, CallInfo *ci,
/*
** The subtraction of two potentially unrelated pointers is
** not ISO C, but it should not crash a program; the subsequent
** checks are ISO C and ensure a correct result.
** Check whether pointer 'o' points to some value in the stack
** frame of the current function. Because 'o' may not point to a
** value in this stack, we cannot compare it with the region
** boundaries (undefined behaviour in ISO C).
*/
static int isinstack (CallInfo *ci, const TValue *o) {
StkId base = ci->func + 1;
ptrdiff_t i = cast(StkId, o) - base;
return (0 <= i && i < (ci->top - base) && s2v(base + i) == o);
StkId pos;
for (pos = ci->func + 1; pos < ci->top; pos++) {
if (o == s2v(pos))
return 1;
}
return 0; /* not found */
}
@ -701,6 +695,19 @@ l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
}
l_noret luaG_callerror (lua_State *L, const TValue *o) {
CallInfo *ci = L->ci;
const char *name = NULL; /* to avoid warnings */
const char *what = (isLua(ci)) ? funcnamefromcode(L, ci, &name) : NULL;
if (what != NULL) {
const char *t = luaT_objtypename(L, o);
luaG_runerror(L, "%s '%s' is not callable (a %s value)", what, name, t);
}
else
luaG_typeerror(L, o, "call");
}
l_noret luaG_forerror (lua_State *L, const TValue *o, const char *what) {
luaG_runerror(L, "bad 'for' %s (number expected, got %s)",
what, luaT_objtypename(L, o));
@ -726,7 +733,7 @@ l_noret luaG_opinterror (lua_State *L, const TValue *p1,
*/
l_noret luaG_tointerror (lua_State *L, const TValue *p1, const TValue *p2) {
lua_Integer temp;
if (!tointegerns(p1, &temp))
if (!luaV_tointegerns(p1, &temp, LUA_FLOORN2I))
p2 = p1;
luaG_runerror(L, "number%s has no integer representation", varinfo(L, p2));
}
@ -784,20 +791,49 @@ l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
/*
** Check whether new instruction 'newpc' is in a different line from
** previous instruction 'oldpc'.
** previous instruction 'oldpc'. More often than not, 'newpc' is only
** one or a few instructions after 'oldpc' (it must be after, see
** caller), so try to avoid calling 'luaG_getfuncline'. If they are
** too far apart, there is a good chance of a ABSLINEINFO in the way,
** so it goes directly to 'luaG_getfuncline'.
*/
static int changedline (const Proto *p, int oldpc, int newpc) {
while (oldpc++ < newpc) {
if (p->lineinfo[oldpc] != 0)
return (luaG_getfuncline(p, oldpc - 1) != luaG_getfuncline(p, newpc));
if (p->lineinfo == NULL) /* no debug information? */
return 0;
if (newpc - oldpc < MAXIWTHABS / 2) { /* not too far apart? */
int delta = 0; /* line diference */
int pc = oldpc;
for (;;) {
int lineinfo = p->lineinfo[++pc];
if (lineinfo == ABSLINEINFO)
break; /* cannot compute delta; fall through */
delta += lineinfo;
if (pc == newpc)
return (delta != 0); /* delta computed successfully */
}
}
return 0; /* no line changes in the way */
/* either instructions are too far apart or there is an absolute line
info in the way; compute line difference explicitly */
return (luaG_getfuncline(p, oldpc) != luaG_getfuncline(p, newpc));
}
/*
** Traces the execution of a Lua function. Called before the execution
** of each opcode, when debug is on. 'L->oldpc' stores the last
** instruction traced, to detect line changes. When entering a new
** function, 'npci' will be zero and will test as a new line whatever
** the value of 'oldpc'. Some exceptional conditions may return to
** a function without setting 'oldpc'. In that case, 'oldpc' may be
** invalid; if so, use zero as a valid value. (A wrong but valid 'oldpc'
** at most causes an extra call to a line hook.)
** This function is not "Protected" when called, so it should correct
** 'L->top' before calling anything that can run the GC.
*/
int luaG_traceexec (lua_State *L, const Instruction *pc) {
CallInfo *ci = L->ci;
lu_byte mask = L->hookmask;
const Proto *p = ci_func(ci)->p;
int counthook;
if (!(mask & (LUA_MASKLINE | LUA_MASKCOUNT))) { /* no hooks? */
ci->u.l.trap = 0; /* don't need to stop again */
@ -814,20 +850,20 @@ int luaG_traceexec (lua_State *L, const Instruction *pc) {
ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
return 1; /* do not call hook again (VM yielded, so it did not move) */
}
if (!isIT(*(ci->u.l.savedpc - 1)))
L->top = ci->top; /* prepare top */
if (!isIT(*(ci->u.l.savedpc - 1))) /* top not being used? */
L->top = ci->top; /* correct top */
if (counthook)
luaD_hook(L, LUA_HOOKCOUNT, -1, 0, 0); /* call count hook */
if (mask & LUA_MASKLINE) {
const Proto *p = ci_func(ci)->p;
/* 'L->oldpc' may be invalid; use zero in this case */
int oldpc = (L->oldpc < p->sizecode) ? L->oldpc : 0;
int npci = pcRel(pc, p);
if (npci == 0 || /* call linehook when enter a new function, */
pc <= L->oldpc || /* when jump back (loop), or when */
changedline(p, pcRel(L->oldpc, p), npci)) { /* enter new line */
if (npci <= oldpc || /* call hook when jump back (loop), */
changedline(p, oldpc, npci)) { /* or when enter new line */
int newline = luaG_getfuncline(p, npci);
luaD_hook(L, LUA_HOOKLINE, newline, 0, 0); /* call line hook */
}
L->oldpc = pc; /* 'pc' of last call to line hook */
L->oldpc = npci; /* 'pc' of last call to line hook */
}
if (L->status == LUA_YIELD) { /* did hook yield? */
if (counthook)

16
lua/src/ldebug.h
View file

@ -13,6 +13,11 @@
#define pcRel(pc, p) (cast_int((pc) - (p)->code) - 1)
/* Active Lua function (given call info) */
#define ci_func(ci) (clLvalue(s2v((ci)->func)))
#define resethookcount(L) (L->hookcount = L->basehookcount)
/*
@ -21,11 +26,22 @@
*/
#define ABSLINEINFO (-0x80)
/*
** MAXimum number of successive Instructions WiTHout ABSolute line
** information. (A power of two allows fast divisions.)
*/
#if !defined(MAXIWTHABS)
#define MAXIWTHABS 128
#endif
LUAI_FUNC int luaG_getfuncline (const Proto *f, int pc);
LUAI_FUNC const char *luaG_findlocal (lua_State *L, CallInfo *ci, int n,
StkId *pos);
LUAI_FUNC l_noret luaG_typeerror (lua_State *L, const TValue *o,
const char *opname);
LUAI_FUNC l_noret luaG_callerror (lua_State *L, const TValue *o);
LUAI_FUNC l_noret luaG_forerror (lua_State *L, const TValue *o,
const char *what);
LUAI_FUNC l_noret luaG_concaterror (lua_State *L, const TValue *p1,

495
lua/src/ldo.c
View file

@ -98,11 +98,12 @@ void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop) {
setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling"));
break;
}
case CLOSEPROTECT: {
case LUA_OK: { /* special case only for closing upvalues */
setnilvalue(s2v(oldtop)); /* no error message */
break;
}
default: {
lua_assert(errorstatus(errcode)); /* real error */
setobjs2s(L, oldtop, L->top - 1); /* error message on current top */
break;
}
@ -118,17 +119,13 @@ l_noret luaD_throw (lua_State *L, int errcode) {
}
else { /* thread has no error handler */
global_State *g = G(L);
errcode = luaF_close(L, L->stack, errcode); /* close all upvalues */
L->status = cast_byte(errcode); /* mark it as dead */
errcode = luaE_resetthread(L, errcode); /* close all upvalues */
if (g->mainthread->errorJmp) { /* main thread has a handler? */
setobjs2s(L, g->mainthread->top++, L->top - 1); /* copy error obj. */
luaD_throw(g->mainthread, errcode); /* re-throw in main thread */
}
else { /* no handler at all; abort */
if (g->panic) { /* panic function? */
luaD_seterrorobj(L, errcode, L->top); /* assume EXTRA_STACK */
if (L->ci->top < L->top)
L->ci->top = L->top; /* pushing msg. can break this invariant */
lua_unlock(L);
g->panic(L); /* call panic function (last chance to jump out) */
}
@ -139,8 +136,7 @@ l_noret luaD_throw (lua_State *L, int errcode) {
int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {
global_State *g = G(L);
l_uint32 oldnCcalls = g->Cstacklimit - (L->nCcalls + L->nci);
l_uint32 oldnCcalls = L->nCcalls;
struct lua_longjmp lj;
lj.status = LUA_OK;
lj.previous = L->errorJmp; /* chain new error handler */
@ -149,7 +145,7 @@ int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {
(*f)(L, ud);
);
L->errorJmp = lj.previous; /* restore old error handler */
L->nCcalls = g->Cstacklimit - oldnCcalls - L->nci;
L->nCcalls = oldnCcalls;
return lj.status;
}
@ -164,9 +160,8 @@ int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {
static void correctstack (lua_State *L, StkId oldstack, StkId newstack) {
CallInfo *ci;
UpVal *up;
if (oldstack == newstack)
return; /* stack address did not change */
L->top = (L->top - oldstack) + newstack;
L->tbclist = (L->tbclist - oldstack) + newstack;
for (up = L->openupval; up != NULL; up = up->u.open.next)
up->v = s2v((uplevel(up) - oldstack) + newstack);
for (ci = L->ci; ci != NULL; ci = ci->previous) {
@ -182,22 +177,37 @@ static void correctstack (lua_State *L, StkId oldstack, StkId newstack) {
#define ERRORSTACKSIZE (LUAI_MAXSTACK + 200)
/*
** Reallocate the stack to a new size, correcting all pointers into
** it. (There are pointers to a stack from its upvalues, from its list
** of call infos, plus a few individual pointers.) The reallocation is
** done in two steps (allocation + free) because the correction must be
** done while both addresses (the old stack and the new one) are valid.
** (In ISO C, any pointer use after the pointer has been deallocated is
** undefined behavior.)
** In case of allocation error, raise an error or return false according
** to 'raiseerror'.
*/
int luaD_reallocstack (lua_State *L, int newsize, int raiseerror) {
int lim = L->stacksize;
StkId newstack = luaM_reallocvector(L, L->stack, lim, newsize, StackValue);
int oldsize = stacksize(L);
int i;
StkId newstack = luaM_reallocvector(L, NULL, 0,
newsize + EXTRA_STACK, StackValue);
lua_assert(newsize <= LUAI_MAXSTACK || newsize == ERRORSTACKSIZE);
lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK);
if (unlikely(newstack == NULL)) { /* reallocation failed? */
if (l_unlikely(newstack == NULL)) { /* reallocation failed? */
if (raiseerror)
luaM_error(L);
else return 0; /* do not raise an error */
}
for (; lim < newsize; lim++)
setnilvalue(s2v(newstack + lim)); /* erase new segment */
/* number of elements to be copied to the new stack */
i = ((oldsize <= newsize) ? oldsize : newsize) + EXTRA_STACK;
memcpy(newstack, L->stack, i * sizeof(StackValue));
for (; i < newsize + EXTRA_STACK; i++)
setnilvalue(s2v(newstack + i)); /* erase new segment */
correctstack(L, L->stack, newstack);
luaM_freearray(L, L->stack, oldsize + EXTRA_STACK);
L->stack = newstack;
L->stacksize = newsize;
L->stack_last = L->stack + newsize - EXTRA_STACK;
L->stack_last = L->stack + newsize;
return 1;
}
@ -207,52 +217,73 @@ int luaD_reallocstack (lua_State *L, int newsize, int raiseerror) {
** is true, raises any error; otherwise, return 0 in case of errors.
*/
int luaD_growstack (lua_State *L, int n, int raiseerror) {
int size = L->stacksize;
int newsize = 2 * size; /* tentative new size */
if (unlikely(size > LUAI_MAXSTACK)) { /* need more space after extra size? */
int size = stacksize(L);
if (l_unlikely(size > LUAI_MAXSTACK)) {
/* if stack is larger than maximum, thread is already using the
extra space reserved for errors, that is, thread is handling
a stack error; cannot grow further than that. */
lua_assert(stacksize(L) == ERRORSTACKSIZE);
if (raiseerror)
luaD_throw(L, LUA_ERRERR); /* error inside message handler */
else return 0;
return 0; /* if not 'raiseerror', just signal it */
}
else {
int needed = cast_int(L->top - L->stack) + n + EXTRA_STACK;
int newsize = 2 * size; /* tentative new size */
int needed = cast_int(L->top - L->stack) + n;
if (newsize > LUAI_MAXSTACK) /* cannot cross the limit */
newsize = LUAI_MAXSTACK;
if (newsize < needed) /* but must respect what was asked for */
newsize = needed;
if (unlikely(newsize > LUAI_MAXSTACK)) { /* stack overflow? */
if (l_likely(newsize <= LUAI_MAXSTACK))
return luaD_reallocstack(L, newsize, raiseerror);
else { /* stack overflow */
/* add extra size to be able to handle the error message */
luaD_reallocstack(L, ERRORSTACKSIZE, raiseerror);
if (raiseerror)
luaG_runerror(L, "stack overflow");
else return 0;
return 0;
}
} /* else no errors */
return luaD_reallocstack(L, newsize, raiseerror);
}
}
static int stackinuse (lua_State *L) {
CallInfo *ci;
int res;
StkId lim = L->top;
for (ci = L->ci; ci != NULL; ci = ci->previous) {
if (lim < ci->top) lim = ci->top;
}
lua_assert(lim <= L->stack_last);
return cast_int(lim - L->stack) + 1; /* part of stack in use */
res = cast_int(lim - L->stack) + 1; /* part of stack in use */
if (res < LUA_MINSTACK)
res = LUA_MINSTACK; /* ensure a minimum size */
return res;
}
/*
** If stack size is more than 3 times the current use, reduce that size
** to twice the current use. (So, the final stack size is at most 2/3 the
** previous size, and half of its entries are empty.)
** As a particular case, if stack was handling a stack overflow and now
** it is not, 'max' (limited by LUAI_MAXSTACK) will be smaller than
** stacksize (equal to ERRORSTACKSIZE in this case), and so the stack
** will be reduced to a "regular" size.
*/
void luaD_shrinkstack (lua_State *L) {
int inuse = stackinuse(L);
int goodsize = inuse + (inuse / 8) + 2*EXTRA_STACK;
if (goodsize > LUAI_MAXSTACK)
goodsize = LUAI_MAXSTACK; /* respect stack limit */
int nsize = inuse * 2; /* proposed new size */
int max = inuse * 3; /* maximum "reasonable" size */
if (max > LUAI_MAXSTACK) {
max = LUAI_MAXSTACK; /* respect stack limit */
if (nsize > LUAI_MAXSTACK)
nsize = LUAI_MAXSTACK;
}
/* if thread is currently not handling a stack overflow and its
good size is smaller than current size, shrink its stack */
if (inuse <= (LUAI_MAXSTACK - EXTRA_STACK) &&
goodsize < L->stacksize)
luaD_reallocstack(L, goodsize, 0); /* ok if that fails */
size is larger than maximum "reasonable" size, shrink it */
if (inuse <= LUAI_MAXSTACK && stacksize(L) > max)
luaD_reallocstack(L, nsize, 0); /* ok if that fails */
else /* don't change stack */
condmovestack(L,{},{}); /* (change only for debugging) */
luaE_shrinkCI(L); /* shrink CI list */
@ -278,8 +309,8 @@ void luaD_hook (lua_State *L, int event, int line,
if (hook && L->allowhook) { /* make sure there is a hook */
int mask = CIST_HOOKED;
CallInfo *ci = L->ci;
ptrdiff_t top = savestack(L, L->top);
ptrdiff_t ci_top = savestack(L, ci->top);
ptrdiff_t top = savestack(L, L->top); /* preserve original 'top' */
ptrdiff_t ci_top = savestack(L, ci->top); /* idem for 'ci->top' */
lua_Debug ar;
ar.event = event;
ar.currentline = line;
@ -289,8 +320,10 @@ void luaD_hook (lua_State *L, int event, int line,
ci->u2.transferinfo.ftransfer = ftransfer;
ci->u2.transferinfo.ntransfer = ntransfer;
}
if (isLua(ci) && L->top < ci->top)
L->top = ci->top; /* protect entire activation register */
luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
if (L->top + LUA_MINSTACK > ci->top)
if (ci->top < L->top + LUA_MINSTACK)
ci->top = L->top + LUA_MINSTACK;
L->allowhook = 0; /* cannot call hooks inside a hook */
ci->callstatus |= mask;
@ -312,51 +345,53 @@ void luaD_hook (lua_State *L, int event, int line,
** active.
*/
void luaD_hookcall (lua_State *L, CallInfo *ci) {
int hook = (ci->callstatus & CIST_TAIL) ? LUA_HOOKTAILCALL : LUA_HOOKCALL;
Proto *p;
if (!(L->hookmask & LUA_MASKCALL)) /* some other hook? */
return; /* don't call hook */
p = clLvalue(s2v(ci->func))->p;
L->top = ci->top; /* prepare top */
ci->u.l.savedpc++; /* hooks assume 'pc' is already incremented */
luaD_hook(L, hook, -1, 1, p->numparams);
ci->u.l.savedpc--; /* correct 'pc' */
L->oldpc = 0; /* set 'oldpc' for new function */
if (L->hookmask & LUA_MASKCALL) { /* is call hook on? */
int event = (ci->callstatus & CIST_TAIL) ? LUA_HOOKTAILCALL
: LUA_HOOKCALL;
Proto *p = ci_func(ci)->p;
ci->u.l.savedpc++; /* hooks assume 'pc' is already incremented */
luaD_hook(L, event, -1, 1, p->numparams);
ci->u.l.savedpc--; /* correct 'pc' */
}
}
static StkId rethook (lua_State *L, CallInfo *ci, StkId firstres, int nres) {
ptrdiff_t oldtop = savestack(L, L->top); /* hook may change top */
int delta = 0;
if (isLuacode(ci)) {
Proto *p = clLvalue(s2v(ci->func))->p;
if (p->is_vararg)
delta = ci->u.l.nextraargs + p->numparams + 1;
if (L->top < ci->top)
L->top = ci->top; /* correct top to run hook */
}
/*
** Executes a return hook for Lua and C functions and sets/corrects
** 'oldpc'. (Note that this correction is needed by the line hook, so it
** is done even when return hooks are off.)
*/
static void rethook (lua_State *L, CallInfo *ci, int nres) {
if (L->hookmask & LUA_MASKRET) { /* is return hook on? */
StkId firstres = L->top - nres; /* index of first result */
int delta = 0; /* correction for vararg functions */
int ftransfer;
if (isLua(ci)) {
Proto *p = ci_func(ci)->p;
if (p->is_vararg)
delta = ci->u.l.nextraargs + p->numparams + 1;
}
ci->func += delta; /* if vararg, back to virtual 'func' */
ftransfer = cast(unsigned short, firstres - ci->func);
luaD_hook(L, LUA_HOOKRET, -1, ftransfer, nres); /* call it */
ci->func -= delta;
}
if (isLua(ci->previous))
L->oldpc = ci->previous->u.l.savedpc; /* update 'oldpc' */
return restorestack(L, oldtop);
if (isLua(ci = ci->previous))
L->oldpc = pcRel(ci->u.l.savedpc, ci_func(ci)->p); /* set 'oldpc' */
}
/*
** Check whether 'func' has a '__call' metafield. If so, put it in the
** stack, below original 'func', so that 'luaD_call' can call it. Raise
** stack, below original 'func', so that 'luaD_precall' can call it. Raise
** an error if there is no '__call' metafield.
*/
void luaD_tryfuncTM (lua_State *L, StkId func) {
const TValue *tm = luaT_gettmbyobj(L, s2v(func), TM_CALL);
StkId p;
if (unlikely(ttisnil(tm)))
luaG_typeerror(L, s2v(func), "call"); /* nothing to call */
if (l_unlikely(ttisnil(tm)))
luaG_callerror(L, s2v(func)); /* nothing to call */
for (p = L->top; p > func; p--) /* open space for metamethod */
setobjs2s(L, p, p-1);
L->top++; /* stack space pre-allocated by the caller */
@ -380,27 +415,34 @@ static void moveresults (lua_State *L, StkId res, int nres, int wanted) {
case 1: /* one value needed */
if (nres == 0) /* no results? */
setnilvalue(s2v(res)); /* adjust with nil */
else
else /* at least one result */
setobjs2s(L, res, L->top - nres); /* move it to proper place */
L->top = res + 1;
return;
case LUA_MULTRET:
wanted = nres; /* we want all results */
break;
default: /* multiple results (or to-be-closed variables) */
default: /* two/more results and/or to-be-closed variables */
if (hastocloseCfunc(wanted)) { /* to-be-closed variables? */
ptrdiff_t savedres = savestack(L, res);
luaF_close(L, res, LUA_OK); /* may change the stack */
res = restorestack(L, savedres);
wanted = codeNresults(wanted); /* correct value */
L->ci->callstatus |= CIST_CLSRET; /* in case of yields */
L->ci->u2.nres = nres;
luaF_close(L, res, CLOSEKTOP, 1);
L->ci->callstatus &= ~CIST_CLSRET;
if (L->hookmask) /* if needed, call hook after '__close's */
rethook(L, L->ci, nres);
res = restorestack(L, savedres); /* close and hook can move stack */
wanted = decodeNresults(wanted);
if (wanted == LUA_MULTRET)
wanted = nres;
wanted = nres; /* we want all results */
}
break;
}
/* generic case */
firstresult = L->top - nres; /* index of first result */
/* move all results to correct place */
for (i = 0; i < nres && i < wanted; i++)
if (nres > wanted) /* extra results? */
nres = wanted; /* don't need them */
for (i = 0; i < nres; i++) /* move all results to correct place */
setobjs2s(L, res + i, firstresult + i);
for (; i < wanted; i++) /* complete wanted number of results */
setnilvalue(s2v(res + i));
@ -409,15 +451,21 @@ static void moveresults (lua_State *L, StkId res, int nres, int wanted) {
/*
** Finishes a function call: calls hook if necessary, removes CallInfo,
** moves current number of results to proper place.
** Finishes a function call: calls hook if necessary, moves current
** number of results to proper place, and returns to previous call
** info. If function has to close variables, hook must be called after
** that.
*/
void luaD_poscall (lua_State *L, CallInfo *ci, int nres) {
if (L->hookmask)
L->top = rethook(L, ci, L->top - nres, nres);
L->ci = ci->previous; /* back to caller */
int wanted = ci->nresults;
if (l_unlikely(L->hookmask && !hastocloseCfunc(wanted)))
rethook(L, ci, nres);
/* move results to proper place */
moveresults(L, ci->func, nres, ci->nresults);
moveresults(L, ci->func, nres, wanted);
/* function cannot be in any of these cases when returning */
lua_assert(!(ci->callstatus &
(CIST_HOOKED | CIST_YPCALL | CIST_FIN | CIST_TRAN | CIST_CLSRET)));
L->ci = ci->previous; /* back to caller (after closing variables) */
}
@ -450,12 +498,14 @@ void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int narg1) {
/*
** Call a function (C or Lua). The function to be called is at *func.
** The arguments are on the stack, right after the function.
** When returns, all the results are on the stack, starting at the original
** function position.
** Prepares the call to a function (C or Lua). For C functions, also do
** the call. The function to be called is at '*func'. The arguments
** are on the stack, right after the function. Returns the CallInfo
** to be executed, if it was a Lua function. Otherwise (a C function)
** returns NULL, with all the results on the stack, starting at the
** original function position.
*/
void luaD_call (lua_State *L, StkId func, int nresults) {
CallInfo *luaD_precall (lua_State *L, StkId func, int nresults) {
lua_CFunction f;
retry:
switch (ttypetag(s2v(func))) {
@ -466,15 +516,15 @@ void luaD_call (lua_State *L, StkId func, int nresults) {
f = fvalue(s2v(func));
Cfunc: {
int n; /* number of returns */
CallInfo *ci = next_ci(L);
checkstackp(L, LUA_MINSTACK, func); /* ensure minimum stack size */
CallInfo *ci;
checkstackGCp(L, LUA_MINSTACK, func); /* ensure minimum stack size */
L->ci = ci = next_ci(L);
ci->nresults = nresults;
ci->callstatus = CIST_C;
ci->top = L->top + LUA_MINSTACK;
ci->func = func;
L->ci = ci;
lua_assert(ci->top <= L->stack_last);
if (L->hookmask & LUA_MASKCALL) {
if (l_unlikely(L->hookmask & LUA_MASKCALL)) {
int narg = cast_int(L->top - func) - 1;
luaD_hook(L, LUA_HOOKCALL, -1, 1, narg);
}
@ -483,29 +533,28 @@ void luaD_call (lua_State *L, StkId func, int nresults) {
lua_lock(L);
api_checknelems(L, n);
luaD_poscall(L, ci, n);
break;
return NULL;
}
case LUA_VLCL: { /* Lua function */
CallInfo *ci = next_ci(L);
CallInfo *ci;
Proto *p = clLvalue(s2v(func))->p;
int narg = cast_int(L->top - func) - 1; /* number of real arguments */
int nfixparams = p->numparams;
int fsize = p->maxstacksize; /* frame size */
checkstackp(L, fsize, func);
checkstackGCp(L, fsize, func);
L->ci = ci = next_ci(L);
ci->nresults = nresults;
ci->u.l.savedpc = p->code; /* starting point */
ci->callstatus = 0;
ci->top = func + 1 + fsize;
ci->func = func;
L->ci = ci;
for (; narg < nfixparams; narg++)
setnilvalue(s2v(L->top++)); /* complete missing arguments */
lua_assert(ci->top <= L->stack_last);
luaV_execute(L, ci); /* run the function */
break;
return ci;
}
default: { /* not a function */
checkstackp(L, 1, func); /* space for metamethod */
checkstackGCp(L, 1, func); /* space for metamethod */
luaD_tryfuncTM(L, func); /* try to get '__call' metamethod */
goto retry; /* try again with metamethod */
}
@ -514,42 +563,108 @@ void luaD_call (lua_State *L, StkId func, int nresults) {
/*
** Similar to 'luaD_call', but does not allow yields during the call.
** If there is a stack overflow, freeing all CI structures will
** force the subsequent call to invoke 'luaE_extendCI', which then
** will raise any errors.
** Call a function (C or Lua) through C. 'inc' can be 1 (increment
** number of recursive invocations in the C stack) or nyci (the same
** plus increment number of non-yieldable calls).
*/
void luaD_callnoyield (lua_State *L, StkId func, int nResults) {
incXCcalls(L);
if (getCcalls(L) <= CSTACKERR) /* possible stack overflow? */
luaE_freeCI(L);
luaD_call(L, func, nResults);
decXCcalls(L);
static void ccall (lua_State *L, StkId func, int nResults, int inc) {
CallInfo *ci;
L->nCcalls += inc;
if (l_unlikely(getCcalls(L) >= LUAI_MAXCCALLS))
luaE_checkcstack(L);
if ((ci = luaD_precall(L, func, nResults)) != NULL) { /* Lua function? */
ci->callstatus = CIST_FRESH; /* mark that it is a "fresh" execute */
luaV_execute(L, ci); /* call it */
}
L->nCcalls -= inc;
}
/*
** Completes the execution of an interrupted C function, calling its
** continuation function.
** External interface for 'ccall'
*/
static void finishCcall (lua_State *L, int status) {
CallInfo *ci = L->ci;
int n;
/* must have a continuation and must be able to call it */
lua_assert(ci->u.c.k != NULL && yieldable(L));
/* error status can only happen in a protected call */
lua_assert((ci->callstatus & CIST_YPCALL) || status == LUA_YIELD);
if (ci->callstatus & CIST_YPCALL) { /* was inside a pcall? */
ci->callstatus &= ~CIST_YPCALL; /* continuation is also inside it */
L->errfunc = ci->u.c.old_errfunc; /* with the same error function */
void luaD_call (lua_State *L, StkId func, int nResults) {
ccall(L, func, nResults, 1);
}
/*
** Similar to 'luaD_call', but does not allow yields during the call.
*/
void luaD_callnoyield (lua_State *L, StkId func, int nResults) {
ccall(L, func, nResults, nyci);
}
/*
** Finish the job of 'lua_pcallk' after it was interrupted by an yield.
** (The caller, 'finishCcall', does the final call to 'adjustresults'.)
** The main job is to complete the 'luaD_pcall' called by 'lua_pcallk'.
** If a '__close' method yields here, eventually control will be back
** to 'finishCcall' (when that '__close' method finally returns) and
** 'finishpcallk' will run again and close any still pending '__close'
** methods. Similarly, if a '__close' method errs, 'precover' calls
** 'unroll' which calls ''finishCcall' and we are back here again, to
** close any pending '__close' methods.
** Note that, up to the call to 'luaF_close', the corresponding
** 'CallInfo' is not modified, so that this repeated run works like the
** first one (except that it has at least one less '__close' to do). In
** particular, field CIST_RECST preserves the error status across these
** multiple runs, changing only if there is a new error.
*/
static int finishpcallk (lua_State *L, CallInfo *ci) {
int status = getcistrecst(ci); /* get original status */
if (l_likely(status == LUA_OK)) /* no error? */
status = LUA_YIELD; /* was interrupted by an yield */
else { /* error */
StkId func = restorestack(L, ci->u2.funcidx);
L->allowhook = getoah(ci->callstatus); /* restore 'allowhook' */
luaF_close(L, func, status, 1); /* can yield or raise an error */
func = restorestack(L, ci->u2.funcidx); /* stack may be moved */
luaD_seterrorobj(L, status, func);
luaD_shrinkstack(L); /* restore stack size in case of overflow */
setcistrecst(ci, LUA_OK); /* clear original status */
}
ci->callstatus &= ~CIST_YPCALL;
L->errfunc = ci->u.c.old_errfunc;
/* if it is here, there were errors or yields; unlike 'lua_pcallk',
do not change status */
return status;
}
/*
** Completes the execution of a C function interrupted by an yield.
** The interruption must have happened while the function was either
** closing its tbc variables in 'moveresults' or executing
** 'lua_callk'/'lua_pcallk'. In the first case, it just redoes
** 'luaD_poscall'. In the second case, the call to 'finishpcallk'
** finishes the interrupted execution of 'lua_pcallk'. After that, it
** calls the continuation of the interrupted function and finally it
** completes the job of the 'luaD_call' that called the function. In
** the call to 'adjustresults', we do not know the number of results
** of the function called by 'lua_callk'/'lua_pcallk', so we are
** conservative and use LUA_MULTRET (always adjust).
*/
static void finishCcall (lua_State *L, CallInfo *ci) {
int n; /* actual number of results from C function */
if (ci->callstatus & CIST_CLSRET) { /* was returning? */
lua_assert(hastocloseCfunc(ci->nresults));
n = ci->u2.nres; /* just redo 'luaD_poscall' */
/* don't need to reset CIST_CLSRET, as it will be set again anyway */
}
else {
int status = LUA_YIELD; /* default if there were no errors */
/* must have a continuation and must be able to call it */
lua_assert(ci->u.c.k != NULL && yieldable(L));
if (ci->callstatus & CIST_YPCALL) /* was inside a 'lua_pcallk'? */
status = finishpcallk(L, ci); /* finish it */
adjustresults(L, LUA_MULTRET); /* finish 'lua_callk' */
lua_unlock(L);
n = (*ci->u.c.k)(L, status, ci->u.c.ctx); /* call continuation */
lua_lock(L);
api_checknelems(L, n);
}
/* finish 'lua_callk'/'lua_pcall'; CIST_YPCALL and 'errfunc' already
handled */
adjustresults(L, ci->nresults);
lua_unlock(L);
n = (*ci->u.c.k)(L, status, ci->u.c.ctx); /* call continuation function */
lua_lock(L);
api_checknelems(L, n);
luaD_poscall(L, ci, n); /* finish 'luaD_call' */
}
@ -557,18 +672,14 @@ static void finishCcall (lua_State *L, int status) {
/*
** Executes "full continuation" (everything in the stack) of a
** previously interrupted coroutine until the stack is empty (or another
** interruption long-jumps out of the loop). If the coroutine is
** recovering from an error, 'ud' points to the error status, which must
** be passed to the first continuation function (otherwise the default
** status is LUA_YIELD).
** interruption long-jumps out of the loop).
*/
static void unroll (lua_State *L, void *ud) {
CallInfo *ci;
if (ud != NULL) /* error status? */
finishCcall(L, *(int *)ud); /* finish 'lua_pcallk' callee */
UNUSED(ud);
while ((ci = L->ci) != &L->base_ci) { /* something in the stack */
if (!isLua(ci)) /* C function? */
finishCcall(L, LUA_YIELD); /* complete its execution */
finishCcall(L, ci); /* complete its execution */
else { /* Lua function */
luaV_finishOp(L); /* finish interrupted instruction */
luaV_execute(L, ci); /* execute down to higher C 'boundary' */
@ -591,28 +702,6 @@ static CallInfo *findpcall (lua_State *L) {
}
/*
** Recovers from an error in a coroutine. Finds a recover point (if
** there is one) and completes the execution of the interrupted
** 'luaD_pcall'. If there is no recover point, returns zero.
*/
static int recover (lua_State *L, int status) {
StkId oldtop;
CallInfo *ci = findpcall(L);
if (ci == NULL) return 0; /* no recovery point */
/* "finish" luaD_pcall */
oldtop = restorestack(L, ci->u2.funcidx);
luaF_close(L, oldtop, status); /* may change the stack */
oldtop = restorestack(L, ci->u2.funcidx);
luaD_seterrorobj(L, status, oldtop);
L->ci = ci;
L->allowhook = getoah(ci->callstatus); /* restore original 'allowhook' */
luaD_shrinkstack(L);
L->errfunc = ci->u.c.old_errfunc;
return 1; /* continue running the coroutine */
}
/*
** Signal an error in the call to 'lua_resume', not in the execution
** of the coroutine itself. (Such errors should not be handled by any
@ -638,14 +727,16 @@ static void resume (lua_State *L, void *ud) {
int n = *(cast(int*, ud)); /* number of arguments */
StkId firstArg = L->top - n; /* first argument */
CallInfo *ci = L->ci;
if (L->status == LUA_OK) { /* starting a coroutine? */
luaD_call(L, firstArg - 1, LUA_MULTRET);
}
if (L->status == LUA_OK) /* starting a coroutine? */
ccall(L, firstArg - 1, LUA_MULTRET, 1); /* just call its body */
else { /* resuming from previous yield */
lua_assert(L->status == LUA_YIELD);
L->status = LUA_OK; /* mark that it is running (again) */
if (isLua(ci)) /* yielded inside a hook? */
luaE_incCstack(L); /* control the C stack */
if (isLua(ci)) { /* yielded inside a hook? */
L->top = firstArg; /* discard arguments */
luaV_execute(L, ci); /* just continue running Lua code */
}
else { /* 'common' yield */
if (ci->u.c.k != NULL) { /* does it have a continuation function? */
lua_unlock(L);
@ -659,6 +750,26 @@ static void resume (lua_State *L, void *ud) {
}
}
/*
** Unrolls a coroutine in protected mode while there are recoverable
** errors, that is, errors inside a protected call. (Any error
** interrupts 'unroll', and this loop protects it again so it can
** continue.) Stops with a normal end (status == LUA_OK), an yield
** (status == LUA_YIELD), or an unprotected error ('findpcall' doesn't
** find a recover point).
*/
static int precover (lua_State *L, int status) {
CallInfo *ci;
while (errorstatus(status) && (ci = findpcall(L)) != NULL) {
L->ci = ci; /* go down to recovery functions */
setcistrecst(ci, status); /* status to finish 'pcall' */
status = luaD_rawrunprotected(L, unroll, NULL);
}
return status;
}
LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs,
int *nresults) {
int status;
@ -671,21 +782,13 @@ LUA_API int lua_resume (lua_State *L, lua_State *from, int nargs,
}
else if (L->status != LUA_YIELD) /* ended with errors? */
return resume_error(L, "cannot resume dead coroutine", nargs);
if (from == NULL)
L->nCcalls = CSTACKTHREAD;
else /* correct 'nCcalls' for this thread */
L->nCcalls = getCcalls(from) + from->nci - L->nci - CSTACKCF;
if (L->nCcalls <= CSTACKERR)
return resume_error(L, "C stack overflow", nargs);
L->nCcalls = (from) ? getCcalls(from) : 0;
luai_userstateresume(L, nargs);
api_checknelems(L, (L->status == LUA_OK) ? nargs + 1 : nargs);
status = luaD_rawrunprotected(L, resume, &nargs);
/* continue running after recoverable errors */
while (errorstatus(status) && recover(L, status)) {
/* unroll continuation */
status = luaD_rawrunprotected(L, unroll, &status);
}
if (likely(!errorstatus(status)))
status = precover(L, status);
if (l_likely(!errorstatus(status)))
lua_assert(status == L->status); /* normal end or yield */
else { /* unrecoverable error */
L->status = cast_byte(status); /* mark thread as 'dead' */
@ -706,26 +809,27 @@ LUA_API int lua_isyieldable (lua_State *L) {
LUA_API int lua_yieldk (lua_State *L, int nresults, lua_KContext ctx,
lua_KFunction k) {
CallInfo *ci = L->ci;
CallInfo *ci;
luai_userstateyield(L, nresults);
lua_lock(L);
ci = L->ci;
api_checknelems(L, nresults);
if (unlikely(!yieldable(L))) {
if (l_unlikely(!yieldable(L))) {
if (L != G(L)->mainthread)
luaG_runerror(L, "attempt to yield across a C-call boundary");
else
luaG_runerror(L, "attempt to yield from outside a coroutine");
}
L->status = LUA_YIELD;
ci->u2.nyield = nresults; /* save number of results */
if (isLua(ci)) { /* inside a hook? */
lua_assert(!isLuacode(ci));
api_check(L, nresults == 0, "hooks cannot yield values");
api_check(L, k == NULL, "hooks cannot continue after yielding");
ci->u2.nyield = 0; /* no results */
}
else {
if ((ci->u.c.k = k) != NULL) /* is there a continuation? */
ci->u.c.ctx = ctx; /* save context */
ci->u2.nyield = nresults; /* save number of results */
luaD_throw(L, LUA_YIELD);
}
lua_assert(ci->callstatus & CIST_HOOKED); /* must be inside a hook */
@ -734,6 +838,45 @@ LUA_API int lua_yieldk (lua_State *L, int nresults, lua_KContext ctx,
}
/*
** Auxiliary structure to call 'luaF_close' in protected mode.
*/
struct CloseP {
StkId level;
int status;
};
/*
** Auxiliary function to call 'luaF_close' in protected mode.
*/
static void closepaux (lua_State *L, void *ud) {
struct CloseP *pcl = cast(struct CloseP *, ud);
luaF_close(L, pcl->level, pcl->status, 0);
}
/*
** Calls 'luaF_close' in protected mode. Return the original status
** or, in case of errors, the new status.
*/
int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status) {
CallInfo *old_ci = L->ci;
lu_byte old_allowhooks = L->allowhook;
for (;;) { /* keep closing upvalues until no more errors */
struct CloseP pcl;
pcl.level = restorestack(L, level); pcl.status = status;
status = luaD_rawrunprotected(L, &closepaux, &pcl);
if (l_likely(status == LUA_OK)) /* no more errors? */
return pcl.status;
else { /* an error occurred; restore saved state and repeat */
L->ci = old_ci;
L->allowhook = old_allowhooks;
}
}
}
/*
** Call the C function 'func' in protected mode, restoring basic
** thread information ('allowhook', etc.) and in particular
@ -747,14 +890,12 @@ int luaD_pcall (lua_State *L, Pfunc func, void *u,
ptrdiff_t old_errfunc = L->errfunc;
L->errfunc = ef;
status = luaD_rawrunprotected(L, func, u);
if (unlikely(status != LUA_OK)) { /* an error occurred? */
StkId oldtop = restorestack(L, old_top);
if (l_unlikely(status != LUA_OK)) { /* an error occurred? */
L->ci = old_ci;
L->allowhook = old_allowhooks;
status = luaF_close(L, oldtop, status);
oldtop = restorestack(L, old_top); /* previous call may change stack */
luaD_seterrorobj(L, status, oldtop);
luaD_shrinkstack(L);
status = luaD_closeprotected(L, old_top, status);
luaD_seterrorobj(L, status, restorestack(L, old_top));
luaD_shrinkstack(L); /* restore stack size in case of overflow */
}
L->errfunc = old_errfunc;
return status;

10
lua/src/ldo.h
View file

@ -17,11 +17,13 @@
** Macro to check stack size and grow stack if needed. Parameters
** 'pre'/'pos' allow the macro to preserve a pointer into the
** stack across reallocations, doing the work only when needed.
** It also allows the running of one GC step when the stack is
** reallocated.
** 'condmovestack' is used in heavy tests to force a stack reallocation
** at every check.
*/
#define luaD_checkstackaux(L,n,pre,pos) \
if (L->stack_last - L->top <= (n)) \
if (l_unlikely(L->stack_last - L->top <= (n))) \
{ pre; luaD_growstack(L, n, 1); pos; } \
else { condmovestack(L,pre,pos); }
@ -35,7 +37,7 @@
/* macro to check stack size, preserving 'p' */
#define checkstackp(L,n,p) \
#define checkstackGCp(L,n,p) \
luaD_checkstackaux(L, n, \
ptrdiff_t t__ = savestack(L, p); /* save 'p' */ \
luaC_checkGC(L), /* stack grow uses memory */ \
@ -44,7 +46,7 @@
/* macro to check stack size and GC */
#define checkstackGC(L,fsize) \
luaD_checkstackaux(L, (fsize), (void)0, luaC_checkGC(L))
luaD_checkstackaux(L, (fsize), luaC_checkGC(L), (void)0)
/* type of protected functions, to be ran by 'runprotected' */
@ -57,9 +59,11 @@ LUAI_FUNC void luaD_hook (lua_State *L, int event, int line,
int fTransfer, int nTransfer);
LUAI_FUNC void luaD_hookcall (lua_State *L, CallInfo *ci);
LUAI_FUNC void luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func, int n);
LUAI_FUNC CallInfo *luaD_precall (lua_State *L, StkId func, int nResults);
LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
LUAI_FUNC void luaD_callnoyield (lua_State *L, StkId func, int nResults);
LUAI_FUNC void luaD_tryfuncTM (lua_State *L, StkId func);
LUAI_FUNC int luaD_closeprotected (lua_State *L, ptrdiff_t level, int status);
LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
ptrdiff_t oldtop, ptrdiff_t ef);
LUAI_FUNC void luaD_poscall (lua_State *L, CallInfo *ci, int nres);

179
lua/src/lfunc.c
View file

@ -53,7 +53,7 @@ void luaF_initupvals (lua_State *L, LClosure *cl) {
uv->v = &uv->u.value; /* make it closed */
setnilvalue(uv->v);
cl->upvals[i] = uv;
luaC_objbarrier(L, cl, o);
luaC_objbarrier(L, cl, uv);
}
}
@ -100,115 +100,83 @@ UpVal *luaF_findupval (lua_State *L, StkId level) {
}
static void callclose (lua_State *L, void *ud) {
UNUSED(ud);
luaD_callnoyield(L, L->top - 3, 0);
}
/*
** Prepare closing method plus its arguments for object 'obj' with
** error message 'err'. (This function assumes EXTRA_STACK.)
** Call closing method for object 'obj' with error message 'err'. The
** boolean 'yy' controls whether the call is yieldable.
** (This function assumes EXTRA_STACK.)
*/
static int prepclosingmethod (lua_State *L, TValue *obj, TValue *err) {
static void callclosemethod (lua_State *L, TValue *obj, TValue *err, int yy) {
StkId top = L->top;
const TValue *tm = luaT_gettmbyobj(L, obj, TM_CLOSE);
if (ttisnil(tm)) /* no metamethod? */
return 0; /* nothing to call */
setobj2s(L, top, tm); /* will call metamethod... */
setobj2s(L, top + 1, obj); /* with 'self' as the 1st argument */
setobj2s(L, top + 2, err); /* and error msg. as 2nd argument */
L->top = top + 3; /* add function and arguments */
return 1;
if (yy)
luaD_call(L, top, 0);
else
luaD_callnoyield(L, top, 0);
}
/*
** Raise an error with message 'msg', inserting the name of the
** local variable at position 'level' in the stack.
** Check whether object at given level has a close metamethod and raise
** an error if not.
*/
static void varerror (lua_State *L, StkId level, const char *msg) {
int idx = cast_int(level - L->ci->func);
const char *vname = luaG_findlocal(L, L->ci, idx, NULL);
if (vname == NULL) vname = "?";
luaG_runerror(L, msg, vname);
static void checkclosemth (lua_State *L, StkId level) {
const TValue *tm = luaT_gettmbyobj(L, s2v(level), TM_CLOSE);
if (ttisnil(tm)) { /* no metamethod? */
int idx = cast_int(level - L->ci->func); /* variable index */
const char *vname = luaG_findlocal(L, L->ci, idx, NULL);
if (vname == NULL) vname = "?";
luaG_runerror(L, "variable '%s' got a non-closable value", vname);
}
}
/*
** Prepare and call a closing method. If status is OK, code is still
** inside the original protected call, and so any error will be handled
** there. Otherwise, a previous error already activated the original
** protected call, and so the call to the closing method must be
** protected here. (A status == CLOSEPROTECT behaves like a previous
** error, to also run the closing method in protected mode).
** If status is OK, the call to the closing method will be pushed
** at the top of the stack. Otherwise, values are pushed after
** the 'level' of the upvalue being closed, as everything after
** that won't be used again.
** Prepare and call a closing method.
** If status is CLOSEKTOP, the call to the closing method will be pushed
** at the top of the stack. Otherwise, values can be pushed right after
** the 'level' of the upvalue being closed, as everything after that
** won't be used again.
*/
static int callclosemth (lua_State *L, StkId level, int status) {
static void prepcallclosemth (lua_State *L, StkId level, int status, int yy) {
TValue *uv = s2v(level); /* value being closed */
if (likely(status == LUA_OK)) {
if (prepclosingmethod(L, uv, &G(L)->nilvalue)) /* something to call? */
callclose(L, NULL); /* call closing method */
else if (!l_isfalse(uv)) /* non-closable non-false value? */
varerror(L, level, "attempt to close non-closable variable '%s'");
TValue *errobj;
if (status == CLOSEKTOP)
errobj = &G(L)->nilvalue; /* error object is nil */
else { /* 'luaD_seterrorobj' will set top to level + 2 */
errobj = s2v(level + 1); /* error object goes after 'uv' */
luaD_seterrorobj(L, status, level + 1); /* set error object */
}
else { /* must close the object in protected mode */
ptrdiff_t oldtop;
level++; /* space for error message */
oldtop = savestack(L, level + 1); /* top will be after that */
luaD_seterrorobj(L, status, level); /* set error message */
if (prepclosingmethod(L, uv, s2v(level))) { /* something to call? */
int newstatus = luaD_pcall(L, callclose, NULL, oldtop, 0);
if (newstatus != LUA_OK && status == CLOSEPROTECT) /* first error? */
status = newstatus; /* this will be the new error */
else {
if (newstatus != LUA_OK) /* suppressed error? */
luaE_warnerror(L, "__close metamethod");
/* leave original error (or nil) on top */
L->top = restorestack(L, oldtop);
}
}
/* else no metamethod; ignore this case and keep original error */
}
return status;
callclosemethod(L, uv, errobj, yy);
}
/*
** Try to create a to-be-closed upvalue
** (can raise a memory-allocation error)
** Maximum value for deltas in 'tbclist', dependent on the type
** of delta. (This macro assumes that an 'L' is in scope where it
** is used.)
*/
static void trynewtbcupval (lua_State *L, void *ud) {
newupval(L, 1, cast(StkId, ud), &L->openupval);
}
#define MAXDELTA \
((256ul << ((sizeof(L->stack->tbclist.delta) - 1) * 8)) - 1)
/*
** Create a to-be-closed upvalue. If there is a memory error
** when creating the upvalue, the closing method must be called here,
** as there is no upvalue to call it later.
** Insert a variable in the list of to-be-closed variables.
*/
void luaF_newtbcupval (lua_State *L, StkId level) {
TValue *obj = s2v(level);
lua_assert(L->openupval == NULL || uplevel(L->openupval) < level);
if (!l_isfalse(obj)) { /* false doesn't need to be closed */
int status;
const TValue *tm = luaT_gettmbyobj(L, obj, TM_CLOSE);
if (ttisnil(tm)) /* no metamethod? */
varerror(L, level, "variable '%s' got a non-closable value");
status = luaD_rawrunprotected(L, trynewtbcupval, level);
if (unlikely(status != LUA_OK)) { /* memory error creating upvalue? */
lua_assert(status == LUA_ERRMEM);
luaD_seterrorobj(L, LUA_ERRMEM, level + 1); /* save error message */
/* next call must succeed, as object is closable */
prepclosingmethod(L, s2v(level), s2v(level + 1));
callclose(L, NULL); /* call closing method */
luaD_throw(L, LUA_ERRMEM); /* throw memory error */
}
lua_assert(level > L->tbclist);
if (l_isfalse(s2v(level)))
return; /* false doesn't need to be closed */
checkclosemth(L, level); /* value must have a close method */
while (cast_uint(level - L->tbclist) > MAXDELTA) {
L->tbclist += MAXDELTA; /* create a dummy node at maximum delta */
L->tbclist->tbclist.delta = 0;
}
level->tbclist.delta = cast(unsigned short, level - L->tbclist);
L->tbclist = level;
}
@ -220,25 +188,52 @@ void luaF_unlinkupval (UpVal *uv) {
}
int luaF_close (lua_State *L, StkId level, int status) {
/*
** Close all upvalues up to the given stack level.
*/
void luaF_closeupval (lua_State *L, StkId level) {
UpVal *uv;
while ((uv = L->openupval) != NULL && uplevel(uv) >= level) {
StkId upl; /* stack index pointed by 'uv' */
while ((uv = L->openupval) != NULL && (upl = uplevel(uv)) >= level) {
TValue *slot = &uv->u.value; /* new position for value */
lua_assert(uplevel(uv) < L->top);
if (uv->tbc && status != NOCLOSINGMETH) {
/* must run closing method, which may change the stack */
ptrdiff_t levelrel = savestack(L, level);
status = callclosemth(L, uplevel(uv), status);
level = restorestack(L, levelrel);
}
luaF_unlinkupval(uv);
luaF_unlinkupval(uv); /* remove upvalue from 'openupval' list */
setobj(L, slot, uv->v); /* move value to upvalue slot */
uv->v = slot; /* now current value lives here */
if (!iswhite(uv))
gray2black(uv); /* closed upvalues cannot be gray */
luaC_barrier(L, uv, slot);
if (!iswhite(uv)) { /* neither white nor dead? */
nw2black(uv); /* closed upvalues cannot be gray */
luaC_barrier(L, uv, slot);
}
}
}
/*
** Remove firt element from the tbclist plus its dummy nodes.
*/
static void poptbclist (lua_State *L) {
StkId tbc = L->tbclist;
lua_assert(tbc->tbclist.delta > 0); /* first element cannot be dummy */
tbc -= tbc->tbclist.delta;
while (tbc > L->stack && tbc->tbclist.delta == 0)
tbc -= MAXDELTA; /* remove dummy nodes */
L->tbclist = tbc;
}
/*
** Close all upvalues and to-be-closed variables up to the given stack
** level.
*/
void luaF_close (lua_State *L, StkId level, int status, int yy) {
ptrdiff_t levelrel = savestack(L, level);
luaF_closeupval(L, level); /* first, close the upvalues */
while (L->tbclist >= level) { /* traverse tbc's down to that level */
StkId tbc = L->tbclist; /* get variable index */
poptbclist(L); /* remove it from list */
prepcallclosemth(L, tbc, status, yy); /* close variable */
level = restorestack(L, levelrel);
}
return status;
}

13
lua/src/lfunc.h
View file

@ -42,15 +42,9 @@
#define MAXMISS 10
/*
** Special "status" for 'luaF_close'
*/
/* close upvalues without running their closing methods */
#define NOCLOSINGMETH (-1)
/* close upvalues running all closing methods in protected mode */
#define CLOSEPROTECT (-2)
/* special status to close upvalues preserving the top of the stack */
#define CLOSEKTOP (-1)
LUAI_FUNC Proto *luaF_newproto (lua_State *L);
@ -59,7 +53,8 @@ LUAI_FUNC LClosure *luaF_newLclosure (lua_State *L, int nupvals);
LUAI_FUNC void luaF_initupvals (lua_State *L, LClosure *cl);
LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
LUAI_FUNC void luaF_newtbcupval (lua_State *L, StkId level);
LUAI_FUNC int luaF_close (lua_State *L, StkId level, int status);
LUAI_FUNC void luaF_closeupval (lua_State *L, StkId level);
LUAI_FUNC void luaF_close (lua_State *L, StkId level, int status, int yy);
LUAI_FUNC void luaF_unlinkupval (UpVal *uv);
LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,

512
lua/src/lgc.c
View file

@ -60,16 +60,24 @@
#define PAUSEADJ 100
/* mask to erase all color bits (plus gen. related stuff) */
#define maskcolors (~(bitmask(BLACKBIT) | WHITEBITS | AGEBITS))
/* mask with all color bits */
#define maskcolors (bitmask(BLACKBIT) | WHITEBITS)
/* mask with all GC bits */
#define maskgcbits (maskcolors | AGEBITS)
/* macro to erase all color bits then sets only the current white bit */
/* macro to erase all color bits then set only the current white bit */
#define makewhite(g,x) \
(x->marked = cast_byte((x->marked & maskcolors) | luaC_white(g)))
(x->marked = cast_byte((x->marked & ~maskcolors) | luaC_white(g)))
#define white2gray(x) resetbits(x->marked, WHITEBITS)
#define black2gray(x) resetbit(x->marked, BLACKBIT)
/* make an object gray (neither white nor black) */
#define set2gray(x) resetbits(x->marked, maskcolors)
/* make an object black (coming from any color) */
#define set2black(x) \
(x->marked = cast_byte((x->marked & ~WHITEBITS) | bitmask(BLACKBIT)))
#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x)))
@ -77,16 +85,13 @@
#define keyiswhite(n) (keyiscollectable(n) && iswhite(gckey(n)))
#define checkconsistency(obj) \
lua_longassert(!iscollectable(obj) || righttt(obj))
/*
** Protected access to objects in values
*/
#define gcvalueN(o) (iscollectable(o) ? gcvalue(o) : NULL)
#define markvalue(g,o) { checkconsistency(o); \
#define markvalue(g,o) { checkliveness(g->mainthread,o); \
if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); }
#define markkey(g, n) { if keyiswhite(n) reallymarkobject(g,gckey(n)); }
@ -135,31 +140,38 @@ static GCObject **getgclist (GCObject *o) {
/*
** Link a collectable object 'o' with a known type into list pointed by 'p'.
** Link a collectable object 'o' with a known type into the list 'p'.
** (Must be a macro to access the 'gclist' field in different types.)
*/
#define linkgclist(o,p) ((o)->gclist = (p), (p) = obj2gco(o))
#define linkgclist(o,p) linkgclist_(obj2gco(o), &(o)->gclist, &(p))
static void linkgclist_ (GCObject *o, GCObject **pnext, GCObject **list) {
lua_assert(!isgray(o)); /* cannot be in a gray list */
*pnext = *list;
*list = o;
set2gray(o); /* now it is */
}
/*
** Link a generic collectable object 'o' into list pointed by 'p'.
** Link a generic collectable object 'o' into the list 'p'.
*/
#define linkobjgclist(o,p) (*getgclist(o) = (p), (p) = obj2gco(o))
#define linkobjgclist(o,p) linkgclist_(obj2gco(o), getgclist(o), &(p))
/*
** Clear keys for empty entries in tables. If entry is empty
** and its key is not marked, mark its entry as dead. This allows the
** collection of the key, but keeps its entry in the table (its removal
** could break a chain). The main feature of a dead key is that it must
** be different from any other value, to do not disturb searches.
** Other places never manipulate dead keys, because its associated empty
** value is enough to signal that the entry is logically empty.
** Clear keys for empty entries in tables. If entry is empty, mark its
** entry as dead. This allows the collection of the key, but keeps its
** entry in the table: its removal could break a chain and could break
** a table traversal. Other places never manipulate dead keys, because
** its associated empty value is enough to signal that the entry is
** logically empty.
*/
static void clearkey (Node *n) {
lua_assert(isempty(gval(n)));
if (keyiswhite(n))
setdeadkey(n); /* unused and unmarked key; remove it */
if (keyiscollectable(n))
setdeadkey(n); /* unused key; remove it */
}
@ -181,14 +193,17 @@ static int iscleared (global_State *g, const GCObject *o) {
/*
** barrier that moves collector forward, that is, mark the white object
** 'v' being pointed by the black object 'o'. (If in sweep phase, clear
** the black object to white [sweep it] to avoid other barrier calls for
** this same object.) In the generational mode, 'v' must also become
** old, if 'o' is old; however, it cannot be changed directly to OLD,
** because it may still point to non-old objects. So, it is marked as
** OLD0. In the next cycle it will become OLD1, and in the next it
** will finally become OLD (regular old).
** Barrier that moves collector forward, that is, marks the white object
** 'v' being pointed by the black object 'o'. In the generational
** mode, 'v' must also become old, if 'o' is old; however, it cannot
** be changed directly to OLD, because it may still point to non-old
** objects. So, it is marked as OLD0. In the next cycle it will become
** OLD1, and in the next it will finally become OLD (regular old). By
** then, any object it points to will also be old. If called in the
** incremental sweep phase, it clears the black object to white (sweep
** it) to avoid other barrier calls for this same object. (That cannot
** be done is generational mode, as its sweep does not distinguish
** whites from deads.)
*/
void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v) {
global_State *g = G(L);
@ -202,7 +217,8 @@ void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v) {
}
else { /* sweep phase */
lua_assert(issweepphase(g));
makewhite(g, o); /* mark main obj. as white to avoid other barriers */
if (g->gckind == KGC_INC) /* incremental mode? */
makewhite(g, o); /* mark 'o' as white to avoid other barriers */
}
}
@ -214,18 +230,20 @@ void luaC_barrier_ (lua_State *L, GCObject *o, GCObject *v) {
void luaC_barrierback_ (lua_State *L, GCObject *o) {
global_State *g = G(L);
lua_assert(isblack(o) && !isdead(g, o));
lua_assert(g->gckind != KGC_GEN || (isold(o) && getage(o) != G_TOUCHED1));
if (getage(o) != G_TOUCHED2) /* not already in gray list? */
linkobjgclist(o, g->grayagain); /* link it in 'grayagain' */
black2gray(o); /* make object gray (again) */
setage(o, G_TOUCHED1); /* touched in current cycle */
lua_assert((g->gckind == KGC_GEN) == (isold(o) && getage(o) != G_TOUCHED1));
if (getage(o) == G_TOUCHED2) /* already in gray list? */
set2gray(o); /* make it gray to become touched1 */
else /* link it in 'grayagain' and paint it gray */
linkobjgclist(o, g->grayagain);
if (isold(o)) /* generational mode? */
setage(o, G_TOUCHED1); /* touched in current cycle */
}
void luaC_fix (lua_State *L, GCObject *o) {
global_State *g = G(L);
lua_assert(g->allgc == o); /* object must be 1st in 'allgc' list! */
white2gray(o); /* they will be gray forever */
set2gray(o); /* they will be gray forever */
setage(o, G_OLD); /* and old forever */
g->allgc = o->next; /* remove object from 'allgc' list */
o->next = g->fixedgc; /* link it to 'fixedgc' list */
@ -259,24 +277,30 @@ GCObject *luaC_newobj (lua_State *L, int tt, size_t sz) {
/*
** Mark an object. Userdata, strings, and closed upvalues are visited
** and turned black here. Other objects are marked gray and added
** to appropriate list to be visited (and turned black) later. (Open
** upvalues are already linked in 'headuv' list. They are kept gray
** to avoid barriers, as their values will be revisited by the thread.)
** Mark an object. Userdata with no user values, strings, and closed
** upvalues are visited and turned black here. Open upvalues are
** already indirectly linked through their respective threads in the
** 'twups' list, so they don't go to the gray list; nevertheless, they
** are kept gray to avoid barriers, as their values will be revisited
** by the thread or by 'remarkupvals'. Other objects are added to the
** gray list to be visited (and turned black) later. Both userdata and
** upvalues can call this function recursively, but this recursion goes
** for at most two levels: An upvalue cannot refer to another upvalue
** (only closures can), and a userdata's metatable must be a table.
*/
static void reallymarkobject (global_State *g, GCObject *o) {
white2gray(o);
switch (o->tt) {
case LUA_VSHRSTR:
case LUA_VLNGSTR: {
gray2black(o);
set2black(o); /* nothing to visit */
break;
}
case LUA_VUPVAL: {
UpVal *uv = gco2upv(o);
if (!upisopen(uv)) /* open upvalues are kept gray */
gray2black(o);
if (upisopen(uv))
set2gray(uv); /* open upvalues are kept gray */
else
set2black(uv); /* closed upvalues are visited here */
markvalue(g, uv->v); /* mark its content */
break;
}
@ -284,14 +308,14 @@ static void reallymarkobject (global_State *g, GCObject *o) {
Udata *u = gco2u(o);
if (u->nuvalue == 0) { /* no user values? */
markobjectN(g, u->metatable); /* mark its metatable */
gray2black(o); /* nothing else to mark */
set2black(u); /* nothing else to mark */
break;
}
/* else... */
} /* FALLTHROUGH */
case LUA_VLCL: case LUA_VCCL: case LUA_VTABLE:
case LUA_VTHREAD: case LUA_VPROTO: {
linkobjgclist(o, g->gray);
linkobjgclist(o, g->gray); /* to be visited later */
break;
}
default: lua_assert(0); break;
@ -324,28 +348,36 @@ static lu_mem markbeingfnz (global_State *g) {
/*
** Mark all values stored in marked open upvalues from non-marked threads.
** (Values from marked threads were already marked when traversing the
** thread.) Remove from the list threads that no longer have upvalues and
** not-marked threads.
** For each non-marked thread, simulates a barrier between each open
** upvalue and its value. (If the thread is collected, the value will be
** assigned to the upvalue, but then it can be too late for the barrier
** to act. The "barrier" does not need to check colors: A non-marked
** thread must be young; upvalues cannot be older than their threads; so
** any visited upvalue must be young too.) Also removes the thread from
** the list, as it was already visited. Removes also threads with no
** upvalues, as they have nothing to be checked. (If the thread gets an
** upvalue later, it will be linked in the list again.)
*/
static int remarkupvals (global_State *g) {
lua_State *thread;
lua_State **p = &g->twups;
int work = 0;
int work = 0; /* estimate of how much work was done here */
while ((thread = *p) != NULL) {
work++;
lua_assert(!isblack(thread)); /* threads are never black */
if (isgray(thread) && thread->openupval != NULL)
if (!iswhite(thread) && thread->openupval != NULL)
p = &thread->twups; /* keep marked thread with upvalues in the list */
else { /* thread is not marked or without upvalues */
UpVal *uv;
lua_assert(!isold(thread) || thread->openupval == NULL);
*p = thread->twups; /* remove thread from the list */
thread->twups = thread; /* mark that it is out of list */
for (uv = thread->openupval; uv != NULL; uv = uv->u.open.next) {
lua_assert(getage(uv) <= getage(thread));
work++;
if (!iswhite(uv)) /* upvalue already visited? */
if (!iswhite(uv)) { /* upvalue already visited? */
lua_assert(upisopen(uv) && isgray(uv));
markvalue(g, uv->v); /* mark its value */
}
}
}
}
@ -353,12 +385,17 @@ static int remarkupvals (global_State *g) {
}
static void cleargraylists (global_State *g) {
g->gray = g->grayagain = NULL;
g->weak = g->allweak = g->ephemeron = NULL;
}
/*
** mark root set and reset all gray lists, to start a new collection
*/
static void restartcollection (global_State *g) {
g->gray = g->grayagain = NULL;
g->weak = g->allweak = g->ephemeron = NULL;
cleargraylists(g);
markobject(g, g->mainthread);
markvalue(g, &g->l_registry);
markmt(g);
@ -374,6 +411,26 @@ static void restartcollection (global_State *g) {
** =======================================================
*/
/*
** Check whether object 'o' should be kept in the 'grayagain' list for
** post-processing by 'correctgraylist'. (It could put all old objects
** in the list and leave all the work to 'correctgraylist', but it is
** more efficient to avoid adding elements that will be removed.) Only
** TOUCHED1 objects need to be in the list. TOUCHED2 doesn't need to go
** back to a gray list, but then it must become OLD. (That is what
** 'correctgraylist' does when it finds a TOUCHED2 object.)
*/
static void genlink (global_State *g, GCObject *o) {
lua_assert(isblack(o));
if (getage(o) == G_TOUCHED1) { /* touched in this cycle? */
linkobjgclist(o, g->grayagain); /* link it back in 'grayagain' */
} /* everything else do not need to be linked back */
else if (getage(o) == G_TOUCHED2)
changeage(o, G_TOUCHED2, G_OLD); /* advance age */
}
/*
** Traverse a table with weak values and link it to proper list. During
** propagate phase, keep it in 'grayagain' list, to be revisited in the
@ -410,8 +467,9 @@ static void traverseweakvalue (global_State *g, Table *h) {
** the atomic phase, if table has any white->white entry, it has to
** be revisited during ephemeron convergence (as that key may turn
** black). Otherwise, if it has any white key, table has to be cleared
** (in the atomic phase). In generational mode, it (like all visited
** tables) must be kept in some gray list for post-processing.
** (in the atomic phase). In generational mode, some tables
** must be kept in some gray list for post-processing; this is done
** by 'genlink'.
*/
static int traverseephemeron (global_State *g, Table *h, int inv) {
int marked = 0; /* true if an object is marked in this traversal */
@ -450,10 +508,8 @@ static int traverseephemeron (global_State *g, Table *h, int inv) {
linkgclist(h, g->ephemeron); /* have to propagate again */
else if (hasclears) /* table has white keys? */
linkgclist(h, g->allweak); /* may have to clean white keys */
else if (g->gckind == KGC_GEN)
linkgclist(h, g->grayagain); /* keep it in some list */
else
gray2black(h);
genlink(g, obj2gco(h)); /* check whether collector still needs to see it */
return marked;
}
@ -473,10 +529,7 @@ static void traversestrongtable (global_State *g, Table *h) {
markvalue(g, gval(n));
}
}
if (g->gckind == KGC_GEN) {
linkgclist(h, g->grayagain); /* keep it in some gray list */
black2gray(h);
}
genlink(g, obj2gco(h));
}
@ -488,7 +541,6 @@ static lu_mem traversetable (global_State *g, Table *h) {
(cast_void(weakkey = strchr(svalue(mode), 'k')),
cast_void(weakvalue = strchr(svalue(mode), 'v')),
(weakkey || weakvalue))) { /* is really weak? */
black2gray(h); /* keep table gray */
if (!weakkey) /* strong keys? */
traverseweakvalue(g, h);
else if (!weakvalue) /* strong values? */
@ -507,10 +559,7 @@ static int traverseudata (global_State *g, Udata *u) {
markobjectN(g, u->metatable); /* mark its metatable */
for (i = 0; i < u->nuvalue; i++)
markvalue(g, &u->uv[i].uv);
if (g->gckind == KGC_GEN) {
linkgclist(u, g->grayagain); /* keep it in some gray list */
black2gray(u);
}
genlink(g, obj2gco(u));
return 1 + u->nuvalue;
}
@ -559,12 +608,21 @@ static int traverseLclosure (global_State *g, LClosure *cl) {
/*
** Traverse a thread, marking the elements in the stack up to its top
** and cleaning the rest of the stack in the final traversal.
** That ensures that the entire stack have valid (non-dead) objects.
** and cleaning the rest of the stack in the final traversal. That
** ensures that the entire stack have valid (non-dead) objects.
** Threads have no barriers. In gen. mode, old threads must be visited
** at every cycle, because they might point to young objects. In inc.
** mode, the thread can still be modified before the end of the cycle,
** and therefore it must be visited again in the atomic phase. To ensure
** these visits, threads must return to a gray list if they are not new
** (which can only happen in generational mode) or if the traverse is in
** the propagate phase (which can only happen in incremental mode).
*/
static int traversethread (global_State *g, lua_State *th) {
UpVal *uv;
StkId o = th->stack;
if (isold(th) || g->gcstate == GCSpropagate)
linkgclist(th, g->grayagain); /* insert into 'grayagain' list */
if (o == NULL)
return 1; /* stack not completely built yet */
lua_assert(g->gcstate == GCSatomic ||
@ -574,9 +632,8 @@ static int traversethread (global_State *g, lua_State *th) {
for (uv = th->openupval; uv != NULL; uv = uv->u.open.next)
markobject(g, uv); /* open upvalues cannot be collected */
if (g->gcstate == GCSatomic) { /* final traversal? */
StkId lim = th->stack + th->stacksize; /* real end of stack */
for (; o < lim; o++) /* clear not-marked stack slice */
setnilvalue(s2v(o));
for (; o < th->stack_last + EXTRA_STACK; o++)
setnilvalue(s2v(o)); /* clear dead stack slice */
/* 'remarkupvals' may have removed thread from 'twups' list */
if (!isintwups(th) && th->openupval != NULL) {
th->twups = g->twups; /* link it back to the list */
@ -585,17 +642,16 @@ static int traversethread (global_State *g, lua_State *th) {
}
else if (!g->gcemergency)
luaD_shrinkstack(th); /* do not change stack in emergency cycle */
return 1 + th->stacksize;
return 1 + stacksize(th);
}
/*
** traverse one gray object, turning it to black (except for threads,
** which are always gray).
** traverse one gray object, turning it to black.
*/
static lu_mem propagatemark (global_State *g) {
GCObject *o = g->gray;
gray2black(o);
nw2black(o);
g->gray = *getgclist(o); /* remove from 'gray' list */
switch (o->tt) {
case LUA_VTABLE: return traversetable(g, gco2t(o));
@ -603,12 +659,7 @@ static lu_mem propagatemark (global_State *g) {
case LUA_VLCL: return traverseLclosure(g, gco2lcl(o));
case LUA_VCCL: return traverseCclosure(g, gco2ccl(o));
case LUA_VPROTO: return traverseproto(g, gco2p(o));
case LUA_VTHREAD: {
lua_State *th = gco2th(o);
linkgclist(th, g->grayagain); /* insert into 'grayagain' list */
black2gray(o);
return traversethread(g, th);
}
case LUA_VTHREAD: return traversethread(g, gco2th(o));
default: lua_assert(0); return 0;
}
}
@ -638,8 +689,10 @@ static void convergeephemerons (global_State *g) {
g->ephemeron = NULL; /* tables may return to this list when traversed */
changed = 0;
while ((w = next) != NULL) { /* for each ephemeron table */
next = gco2t(w)->gclist; /* list is rebuilt during loop */
if (traverseephemeron(g, gco2t(w), dir)) { /* marked some value? */
Table *h = gco2t(w);
next = h->gclist; /* list is rebuilt during loop */
nw2black(h); /* out of the list (for now) */
if (traverseephemeron(g, h, dir)) { /* marked some value? */
propagateall(g); /* propagate changes */
changed = 1; /* will have to revisit all ephemeron tables */
}
@ -716,12 +769,16 @@ static void freeobj (lua_State *L, GCObject *o) {
case LUA_VUPVAL:
freeupval(L, gco2upv(o));
break;
case LUA_VLCL:
luaM_freemem(L, o, sizeLclosure(gco2lcl(o)->nupvalues));
case LUA_VLCL: {
LClosure *cl = gco2lcl(o);
luaM_freemem(L, cl, sizeLclosure(cl->nupvalues));
break;
case LUA_VCCL:
luaM_freemem(L, o, sizeCclosure(gco2ccl(o)->nupvalues));
}
case LUA_VCCL: {
CClosure *cl = gco2ccl(o);
luaM_freemem(L, cl, sizeCclosure(cl->nupvalues));
break;
}
case LUA_VTABLE:
luaH_free(L, gco2t(o));
break;
@ -733,13 +790,17 @@ static void freeobj (lua_State *L, GCObject *o) {
luaM_freemem(L, o, sizeudata(u->nuvalue, u->len));
break;
}
case LUA_VSHRSTR:
luaS_remove(L, gco2ts(o)); /* remove it from hash table */
luaM_freemem(L, o, sizelstring(gco2ts(o)->shrlen));
case LUA_VSHRSTR: {
TString *ts = gco2ts(o);
luaS_remove(L, ts); /* remove it from hash table */
luaM_freemem(L, ts, sizelstring(ts->shrlen));
break;
case LUA_VLNGSTR:
luaM_freemem(L, o, sizelstring(gco2ts(o)->u.lnglen));
}
case LUA_VLNGSTR: {
TString *ts = gco2ts(o);
luaM_freemem(L, ts, sizelstring(ts->u.lnglen));
break;
}
default: lua_assert(0);
}
}
@ -766,7 +827,7 @@ static GCObject **sweeplist (lua_State *L, GCObject **p, int countin,
freeobj(L, curr); /* erase 'curr' */
}
else { /* change mark to 'white' */
curr->marked = cast_byte((marked & maskcolors) | white);
curr->marked = cast_byte((marked & ~maskgcbits) | white);
p = &curr->next; /* go to next element */
}
}
@ -823,6 +884,8 @@ static GCObject *udata2finalize (global_State *g) {
resetbit(o->marked, FINALIZEDBIT); /* object is "normal" again */
if (issweepphase(g))
makewhite(g, o); /* "sweep" object */
else if (getage(o) == G_OLD1)
g->firstold1 = o; /* it is the first OLD1 object in the list */
return o;
}
@ -853,7 +916,7 @@ static void GCTM (lua_State *L) {
L->ci->callstatus &= ~CIST_FIN; /* not running a finalizer anymore */
L->allowhook = oldah; /* restore hooks */
g->gcrunning = running; /* restore state */
if (unlikely(status != LUA_OK)) { /* error while running __gc? */
if (l_unlikely(status != LUA_OK)) { /* error while running __gc? */
luaE_warnerror(L, "__gc metamethod");
L->top--; /* pops error object */
}
@ -896,15 +959,15 @@ static GCObject **findlast (GCObject **p) {
/*
** Move all unreachable objects (or 'all' objects) that need
** finalization from list 'finobj' to list 'tobefnz' (to be finalized).
** (Note that objects after 'finobjold' cannot be white, so they
** don't need to be traversed. In incremental mode, 'finobjold' is NULL,
** (Note that objects after 'finobjold1' cannot be white, so they
** don't need to be traversed. In incremental mode, 'finobjold1' is NULL,
** so the whole list is traversed.)
*/
static void separatetobefnz (global_State *g, int all) {
GCObject *curr;
GCObject **p = &g->finobj;
GCObject **lastnext = findlast(&g->tobefnz);
while ((curr = *p) != g->finobjold) { /* traverse all finalizable objects */
while ((curr = *p) != g->finobjold1) { /* traverse all finalizable objects */
lua_assert(tofinalize(curr));
if (!(iswhite(curr) || all)) /* not being collected? */
p = &curr->next; /* don't bother with it */
@ -920,6 +983,27 @@ static void separatetobefnz (global_State *g, int all) {
}
/*
** If pointer 'p' points to 'o', move it to the next element.
*/
static void checkpointer (GCObject **p, GCObject *o) {
if (o == *p)
*p = o->next;
}
/*
** Correct pointers to objects inside 'allgc' list when
** object 'o' is being removed from the list.
*/
static void correctpointers (global_State *g, GCObject *o) {
checkpointer(&g->survival, o);
checkpointer(&g->old1, o);
checkpointer(&g->reallyold, o);
checkpointer(&g->firstold1, o);
}
/*
** if object 'o' has a finalizer, remove it from 'allgc' list (must
** search the list to find it) and link it in 'finobj' list.
@ -936,14 +1020,8 @@ void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt) {
if (g->sweepgc == &o->next) /* should not remove 'sweepgc' object */
g->sweepgc = sweeptolive(L, g->sweepgc); /* change 'sweepgc' */
}
else { /* correct pointers into 'allgc' list, if needed */
if (o == g->survival)
g->survival = o->next;
if (o == g->old)
g->old = o->next;
if (o == g->reallyold)
g->reallyold = o->next;
}
else
correctpointers(g, o);
/* search for pointer pointing to 'o' */
for (p = &g->allgc; *p != o; p = &(*p)->next) { /* empty */ }
*p = o->next; /* remove 'o' from 'allgc' list */
@ -965,24 +1043,31 @@ void luaC_checkfinalizer (lua_State *L, GCObject *o, Table *mt) {
static void setpause (global_State *g);
/* mask to erase all color bits, not changing gen-related stuff */
#define maskgencolors (~(bitmask(BLACKBIT) | WHITEBITS))
/*
** Sweep a list of objects, deleting dead ones and turning
** the non dead to old (without changing their colors).
** Sweep a list of objects to enter generational mode. Deletes dead
** objects and turns the non dead to old. All non-dead threads---which
** are now old---must be in a gray list. Everything else is not in a
** gray list. Open upvalues are also kept gray.
*/
static void sweep2old (lua_State *L, GCObject **p) {
GCObject *curr;
global_State *g = G(L);
while ((curr = *p) != NULL) {
if (iswhite(curr)) { /* is 'curr' dead? */
lua_assert(isdead(G(L), curr));
lua_assert(isdead(g, curr));
*p = curr->next; /* remove 'curr' from list */
freeobj(L, curr); /* erase 'curr' */
}
else { /* all surviving objects become old */
setage(curr, G_OLD);
if (curr->tt == LUA_VTHREAD) { /* threads must be watched */
lua_State *th = gco2th(curr);
linkgclist(th, g->grayagain); /* insert into 'grayagain' list */
}
else if (curr->tt == LUA_VUPVAL && upisopen(gco2upv(curr)))
set2gray(curr); /* open upvalues are always gray */
else /* everything else is black */
nw2black(curr);
p = &curr->next; /* go to next element */
}
}
@ -995,9 +1080,13 @@ static void sweep2old (lua_State *L, GCObject **p) {
** during the sweep. So, any white object must be dead.) For
** non-dead objects, advance their ages and clear the color of
** new objects. (Old objects keep their colors.)
** The ages of G_TOUCHED1 and G_TOUCHED2 objects cannot be advanced
** here, because these old-generation objects are usually not swept
** here. They will all be advanced in 'correctgraylist'. That function
** will also remove objects turned white here from any gray list.
*/
static GCObject **sweepgen (lua_State *L, global_State *g, GCObject **p,
GCObject *limit) {
GCObject *limit, GCObject **pfirstold1) {
static const lu_byte nextage[] = {
G_SURVIVAL, /* from G_NEW */
G_OLD1, /* from G_SURVIVAL */
@ -1016,9 +1105,15 @@ static GCObject **sweepgen (lua_State *L, global_State *g, GCObject **p,
freeobj(L, curr); /* erase 'curr' */
}
else { /* correct mark and age */
if (getage(curr) == G_NEW)
curr->marked = cast_byte((curr->marked & maskgencolors) | white);
setage(curr, nextage[getage(curr)]);
if (getage(curr) == G_NEW) { /* new objects go back to white */
int marked = curr->marked & ~maskgcbits; /* erase GC bits */
curr->marked = cast_byte(marked | G_SURVIVAL | white);
}
else { /* all other objects will be old, and so keep their color */
setage(curr, nextage[getage(curr)]);
if (getage(curr) == G_OLD1 && *pfirstold1 == NULL)
*pfirstold1 = curr; /* first OLD1 object in the list */
}
p = &curr->next; /* go to next element */
}
}
@ -1028,58 +1123,50 @@ static GCObject **sweepgen (lua_State *L, global_State *g, GCObject **p,
/*
** Traverse a list making all its elements white and clearing their
** age.
** age. In incremental mode, all objects are 'new' all the time,
** except for fixed strings (which are always old).
*/
static void whitelist (global_State *g, GCObject *p) {
int white = luaC_white(g);
for (; p != NULL; p = p->next)
p->marked = cast_byte((p->marked & maskcolors) | white);
p->marked = cast_byte((p->marked & ~maskgcbits) | white);
}
/*
** Correct a list of gray objects.
** Correct a list of gray objects. Return pointer to where rest of the
** list should be linked.
** Because this correction is done after sweeping, young objects might
** be turned white and still be in the list. They are only removed.
** For tables and userdata, advance 'touched1' to 'touched2'; 'touched2'
** objects become regular old and are removed from the list.
** For threads, just remove white ones from the list.
** 'TOUCHED1' objects are advanced to 'TOUCHED2' and remain on the list;
** Non-white threads also remain on the list; 'TOUCHED2' objects become
** regular old; they and anything else are removed from the list.
*/
static GCObject **correctgraylist (GCObject **p) {
GCObject *curr;
while ((curr = *p) != NULL) {
switch (curr->tt) {
case LUA_VTABLE: case LUA_VUSERDATA: {
GCObject **next = getgclist(curr);
if (getage(curr) == G_TOUCHED1) { /* touched in this cycle? */
lua_assert(isgray(curr));
gray2black(curr); /* make it black, for next barrier */
changeage(curr, G_TOUCHED1, G_TOUCHED2);
p = next; /* go to next element */
}
else { /* not touched in this cycle */
if (!iswhite(curr)) { /* not white? */
lua_assert(isold(curr));
if (getage(curr) == G_TOUCHED2) /* advance from G_TOUCHED2... */
changeage(curr, G_TOUCHED2, G_OLD); /* ... to G_OLD */
gray2black(curr); /* make it black */
}
/* else, object is white: just remove it from this list */
*p = *next; /* remove 'curr' from gray list */
}
break;
}
case LUA_VTHREAD: {
lua_State *th = gco2th(curr);
lua_assert(!isblack(th));
if (iswhite(th)) /* new object? */
*p = th->gclist; /* remove from gray list */
else /* old threads remain gray */
p = &th->gclist; /* go to next element */
break;
}
default: lua_assert(0); /* nothing more could be gray here */
GCObject **next = getgclist(curr);
if (iswhite(curr))
goto remove; /* remove all white objects */
else if (getage(curr) == G_TOUCHED1) { /* touched in this cycle? */
lua_assert(isgray(curr));
nw2black(curr); /* make it black, for next barrier */
changeage(curr, G_TOUCHED1, G_TOUCHED2);
goto remain; /* keep it in the list and go to next element */
}
else if (curr->tt == LUA_VTHREAD) {
lua_assert(isgray(curr));
goto remain; /* keep non-white threads on the list */
}
else { /* everything else is removed */
lua_assert(isold(curr)); /* young objects should be white here */
if (getage(curr) == G_TOUCHED2) /* advance from TOUCHED2... */
changeage(curr, G_TOUCHED2, G_OLD); /* ... to OLD */
nw2black(curr); /* make object black (to be removed) */
goto remove;
}
remove: *p = *next; continue;
remain: p = next; continue;
}
return p;
}
@ -1100,7 +1187,7 @@ static void correctgraylists (global_State *g) {
/*
** Mark 'OLD1' objects when starting a new young collection.
** Mark black 'OLD1' objects when starting a new young collection.
** Gray objects are already in some gray list, and so will be visited
** in the atomic step.
*/
@ -1109,10 +1196,9 @@ static void markold (global_State *g, GCObject *from, GCObject *to) {
for (p = from; p != to; p = p->next) {
if (getage(p) == G_OLD1) {
lua_assert(!iswhite(p));
if (isblack(p)) {
black2gray(p); /* should be '2white', but gray works too */
changeage(p, G_OLD1, G_OLD); /* now they are old */
if (isblack(p))
reallymarkobject(g, p);
}
}
}
}
@ -1131,50 +1217,63 @@ static void finishgencycle (lua_State *L, global_State *g) {
/*
** Does a young collection. First, mark 'OLD1' objects. (Only survival
** and "recent old" lists can contain 'OLD1' objects. New lists cannot
** contain 'OLD1' objects, at most 'OLD0' objects that were already
** visited when marked old.) Then does the atomic step. Then,
** sweep all lists and advance pointers. Finally, finish the collection.
** Does a young collection. First, mark 'OLD1' objects. Then does the
** atomic step. Then, sweep all lists and advance pointers. Finally,
** finish the collection.
*/
static void youngcollection (lua_State *L, global_State *g) {
GCObject **psurvival; /* to point to first non-dead survival object */
GCObject *dummy; /* dummy out parameter to 'sweepgen' */
lua_assert(g->gcstate == GCSpropagate);
markold(g, g->survival, g->reallyold);
if (g->firstold1) { /* are there regular OLD1 objects? */
markold(g, g->firstold1, g->reallyold); /* mark them */
g->firstold1 = NULL; /* no more OLD1 objects (for now) */
}
markold(g, g->finobj, g->finobjrold);
markold(g, g->tobefnz, NULL);
atomic(L);
/* sweep nursery and get a pointer to its last live element */
psurvival = sweepgen(L, g, &g->allgc, g->survival);
/* sweep 'survival' and 'old' */
sweepgen(L, g, psurvival, g->reallyold);
g->reallyold = g->old;
g->old = *psurvival; /* 'survival' survivals are old now */
g->gcstate = GCSswpallgc;
psurvival = sweepgen(L, g, &g->allgc, g->survival, &g->firstold1);
/* sweep 'survival' */
sweepgen(L, g, psurvival, g->old1, &g->firstold1);
g->reallyold = g->old1;
g->old1 = *psurvival; /* 'survival' survivals are old now */
g->survival = g->allgc; /* all news are survivals */
/* repeat for 'finobj' lists */
psurvival = sweepgen(L, g, &g->finobj, g->finobjsur);
/* sweep 'survival' and 'old' */
sweepgen(L, g, psurvival, g->finobjrold);
g->finobjrold = g->finobjold;
g->finobjold = *psurvival; /* 'survival' survivals are old now */
dummy = NULL; /* no 'firstold1' optimization for 'finobj' lists */
psurvival = sweepgen(L, g, &g->finobj, g->finobjsur, &dummy);
/* sweep 'survival' */
sweepgen(L, g, psurvival, g->finobjold1, &dummy);
g->finobjrold = g->finobjold1;
g->finobjold1 = *psurvival; /* 'survival' survivals are old now */
g->finobjsur = g->finobj; /* all news are survivals */
sweepgen(L, g, &g->tobefnz, NULL);
sweepgen(L, g, &g->tobefnz, NULL, &dummy);
finishgencycle(L, g);
}
/*
** Clears all gray lists, sweeps objects, and prepare sublists to enter
** generational mode. The sweeps remove dead objects and turn all
** surviving objects to old. Threads go back to 'grayagain'; everything
** else is turned black (not in any gray list).
*/
static void atomic2gen (lua_State *L, global_State *g) {
cleargraylists(g);
/* sweep all elements making them old */
g->gcstate = GCSswpallgc;
sweep2old(L, &g->allgc);
/* everything alive now is old */
g->reallyold = g->old = g->survival = g->allgc;
g->reallyold = g->old1 = g->survival = g->allgc;
g->firstold1 = NULL; /* there are no OLD1 objects anywhere */
/* repeat for 'finobj' lists */
sweep2old(L, &g->finobj);
g->finobjrold = g->finobjold = g->finobjsur = g->finobj;
g->finobjrold = g->finobjold1 = g->finobjsur = g->finobj;
sweep2old(L, &g->tobefnz);
@ -1187,8 +1286,9 @@ static void atomic2gen (lua_State *L, global_State *g) {
/*
** Enter generational mode. Must go until the end of an atomic cycle
** to ensure that all threads and weak tables are in the gray lists.
** Then, turn all objects into old and finishes the collection.
** to ensure that all objects are correctly marked and weak tables
** are cleared. Then, turn all objects into old and finishes the
** collection.
*/
static lu_mem entergen (lua_State *L, global_State *g) {
lu_mem numobjs;
@ -1207,10 +1307,10 @@ static lu_mem entergen (lua_State *L, global_State *g) {
*/
static void enterinc (global_State *g) {
whitelist(g, g->allgc);
g->reallyold = g->old = g->survival = NULL;
g->reallyold = g->old1 = g->survival = NULL;
whitelist(g, g->finobj);
whitelist(g, g->tobefnz);
g->finobjrold = g->finobjold = g->finobjsur = NULL;
g->finobjrold = g->finobjold1 = g->finobjsur = NULL;
g->gcstate = GCSpause;
g->gckind = KGC_INC;
g->lastatomic = 0;
@ -1475,52 +1575,64 @@ static int sweepstep (lua_State *L, global_State *g,
static lu_mem singlestep (lua_State *L) {
global_State *g = G(L);
lu_mem work;
lua_assert(!g->gcstopem); /* collector is not reentrant */
g->gcstopem = 1; /* no emergency collections while collecting */
switch (g->gcstate) {
case GCSpause: {
restartcollection(g);
g->gcstate = GCSpropagate;
return 1;
work = 1;
break;
}
case GCSpropagate: {
if (g->gray == NULL) { /* no more gray objects? */
g->gcstate = GCSenteratomic; /* finish propagate phase */
return 0;
work = 0;
}
else
return propagatemark(g); /* traverse one gray object */
work = propagatemark(g); /* traverse one gray object */
break;
}
case GCSenteratomic: {
lu_mem work = atomic(L); /* work is what was traversed by 'atomic' */
work = atomic(L); /* work is what was traversed by 'atomic' */
entersweep(L);
g->GCestimate = gettotalbytes(g); /* first estimate */;
return work;
break;
}
case GCSswpallgc: { /* sweep "regular" objects */
return sweepstep(L, g, GCSswpfinobj, &g->finobj);
work = sweepstep(L, g, GCSswpfinobj, &g->finobj);
break;
}
case GCSswpfinobj: { /* sweep objects with finalizers */
return sweepstep(L, g, GCSswptobefnz, &g->tobefnz);
work = sweepstep(L, g, GCSswptobefnz, &g->tobefnz);
break;
}
case GCSswptobefnz: { /* sweep objects to be finalized */
return sweepstep(L, g, GCSswpend, NULL);
work = sweepstep(L, g, GCSswpend, NULL);
break;
}
case GCSswpend: { /* finish sweeps */
checkSizes(L, g);
g->gcstate = GCScallfin;
return 0;
work = 0;
break;
}
case GCScallfin: { /* call remaining finalizers */
if (g->tobefnz && !g->gcemergency) {
int n = runafewfinalizers(L, GCFINMAX);
return n * GCFINALIZECOST;
g->gcstopem = 0; /* ok collections during finalizers */
work = runafewfinalizers(L, GCFINMAX) * GCFINALIZECOST;
}
else { /* emergency mode or no more finalizers */
g->gcstate = GCSpause; /* finish collection */
return 0;
work = 0;
}
break;
}
default: lua_assert(0); return 0;
}
g->gcstopem = 0;
return work;
}

29
lua/src/lgc.h
View file

@ -12,16 +12,16 @@
#include "lstate.h"
/*
** Collectable objects may have one of three colors: white, which
** means the object is not marked; gray, which means the
** object is marked, but its references may be not marked; and
** black, which means that the object and all its references are marked.
** The main invariant of the garbage collector, while marking objects,
** is that a black object can never point to a white one. Moreover,
** any gray object must be in a "gray list" (gray, grayagain, weak,
** allweak, ephemeron) so that it can be visited again before finishing
** the collection cycle. These lists have no meaning when the invariant
** is not being enforced (e.g., sweep phase).
** Collectable objects may have one of three colors: white, which means
** the object is not marked; gray, which means the object is marked, but
** its references may be not marked; and black, which means that the
** object and all its references are marked. The main invariant of the
** garbage collector, while marking objects, is that a black object can
** never point to a white one. Moreover, any gray object must be in a
** "gray list" (gray, grayagain, weak, allweak, ephemeron) so that it
** can be visited again before finishing the collection cycle. (Open
** upvalues are an exception to this rule.) These lists have no meaning
** when the invariant is not being enforced (e.g., sweep phase).
*/
@ -69,14 +69,16 @@
/*
** Layout for bit use in 'marked' field. First three bits are
** used for object "age" in generational mode. Last bit is free
** to be used by respective objects.
** used for object "age" in generational mode. Last bit is used
** by tests.
*/
#define WHITE0BIT 3 /* object is white (type 0) */
#define WHITE1BIT 4 /* object is white (type 1) */
#define BLACKBIT 5 /* object is black */
#define FINALIZEDBIT 6 /* object has been marked for finalization */
#define TESTBIT 7
#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
@ -94,7 +96,8 @@
#define isdead(g,v) isdeadm(otherwhite(g), (v)->marked)
#define changewhite(x) ((x)->marked ^= WHITEBITS)
#define gray2black(x) l_setbit((x)->marked, BLACKBIT)
#define nw2black(x) \
check_exp(!iswhite(x), l_setbit((x)->marked, BLACKBIT))
#define luaC_white(g) cast_byte((g)->currentwhite & WHITEBITS)

30
lua/src/liolib.c
View file

@ -64,6 +64,12 @@ static int l_checkmode (const char *mode) {
#define l_popen(L,c,m) (_popen(c,m))
#define l_pclose(L,file) (_pclose(file))
#if !defined(l_checkmodep)
/* Windows accepts "[rw][bt]?" as valid modes */
#define l_checkmodep(m) ((m[0] == 'r' || m[0] == 'w') && \
(m[1] == '\0' || ((m[1] == 'b' || m[1] == 't') && m[2] == '\0')))
#endif
#else /* }{ */
/* ISO C definitions */
@ -77,6 +83,12 @@ static int l_checkmode (const char *mode) {
#endif /* } */
#if !defined(l_checkmodep)
/* By default, Lua accepts only "r" or "w" as valid modes */
#define l_checkmodep(m) ((m[0] == 'r' || m[0] == 'w') && m[1] == '\0')
#endif
/* }====================================================== */
@ -174,7 +186,7 @@ static int f_tostring (lua_State *L) {
static FILE *tofile (lua_State *L) {
LStream *p = tolstream(L);
if (isclosed(p))
if (l_unlikely(isclosed(p)))
luaL_error(L, "attempt to use a closed file");
lua_assert(p->f);
return p->f;
@ -249,7 +261,7 @@ static LStream *newfile (lua_State *L) {
static void opencheck (lua_State *L, const char *fname, const char *mode) {
LStream *p = newfile(L);
p->f = fopen(fname, mode);
if (p->f == NULL)
if (l_unlikely(p->f == NULL))
luaL_error(L, "cannot open file '%s' (%s)", fname, strerror(errno));
}
@ -279,6 +291,7 @@ static int io_popen (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
LStream *p = newprefile(L);
luaL_argcheck(L, l_checkmodep(mode), 2, "invalid mode");
p->f = l_popen(L, filename, mode);
p->closef = &io_pclose;
return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
@ -296,7 +309,7 @@ static FILE *getiofile (lua_State *L, const char *findex) {
LStream *p;
lua_getfield(L, LUA_REGISTRYINDEX, findex);
p = (LStream *)lua_touserdata(L, -1);
if (isclosed(p))
if (l_unlikely(isclosed(p)))
luaL_error(L, "default %s file is closed", findex + IOPREF_LEN);
return p->f;
}
@ -423,7 +436,7 @@ typedef struct {
** Add current char to buffer (if not out of space) and read next one
*/
static int nextc (RN *rn) {
if (rn->n >= L_MAXLENNUM) { /* buffer overflow? */
if (l_unlikely(rn->n >= L_MAXLENNUM)) { /* buffer overflow? */
rn->buff[0] = '\0'; /* invalidate result */
return 0; /* fail */
}
@ -486,8 +499,8 @@ static int read_number (lua_State *L, FILE *f) {
ungetc(rn.c, rn.f); /* unread look-ahead char */
l_unlockfile(rn.f);
rn.buff[rn.n] = '\0'; /* finish string */
if (lua_stringtonumber(L, rn.buff)) /* is this a valid number? */
return 1; /* ok */
if (l_likely(lua_stringtonumber(L, rn.buff)))
return 1; /* ok, it is a valid number */
else { /* invalid format */
lua_pushnil(L); /* "result" to be removed */
return 0; /* read fails */
@ -663,7 +676,8 @@ static int g_write (lua_State *L, FILE *f, int arg) {
status = status && (fwrite(s, sizeof(char), l, f) == l);
}
}
if (status) return 1; /* file handle already on stack top */
if (l_likely(status))
return 1; /* file handle already on stack top */
else return luaL_fileresult(L, status, NULL);
}
@ -690,7 +704,7 @@ static int f_seek (lua_State *L) {
luaL_argcheck(L, (lua_Integer)offset == p3, 3,
"not an integer in proper range");
op = l_fseek(f, offset, mode[op]);
if (op)
if (l_unlikely(op))
return luaL_fileresult(L, 0, NULL); /* error */
else {
lua_pushinteger(L, (lua_Integer)l_ftell(f));

57
lua/src/llex.c
View file

@ -81,7 +81,6 @@ void luaX_init (lua_State *L) {
const char *luaX_token2str (LexState *ls, int token) {
if (token < FIRST_RESERVED) { /* single-byte symbols? */
lua_assert(token == cast_uchar(token));
if (lisprint(token))
return luaO_pushfstring(ls->L, "'%c'", token);
else /* control character */
@ -123,26 +122,29 @@ l_noret luaX_syntaxerror (LexState *ls, const char *msg) {
/*
** creates a new string and anchors it in scanner's table so that
** it will not be collected until the end of the compilation
** (by that time it should be anchored somewhere)
** Creates a new string and anchors it in scanner's table so that it
** will not be collected until the end of the compilation; by that time
** it should be anchored somewhere. It also internalizes long strings,
** ensuring there is only one copy of each unique string. The table
** here is used as a set: the string enters as the key, while its value
** is irrelevant. We use the string itself as the value only because it
** is a TValue readly available. Later, the code generation can change
** this value.
*/
TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
lua_State *L = ls->L;
TValue *o; /* entry for 'str' */
TString *ts = luaS_newlstr(L, str, l); /* create new string */
setsvalue2s(L, L->top++, ts); /* temporarily anchor it in stack */
o = luaH_set(L, ls->h, s2v(L->top - 1));
if (isempty(o)) { /* not in use yet? */
/* boolean value does not need GC barrier;
table is not a metatable, so it does not need to invalidate cache */
setbtvalue(o); /* t[string] = true */
const TValue *o = luaH_getstr(ls->h, ts);
if (!ttisnil(o)) /* string already present? */
ts = keystrval(nodefromval(o)); /* get saved copy */
else { /* not in use yet */
TValue *stv = s2v(L->top++); /* reserve stack space for string */
setsvalue(L, stv, ts); /* temporarily anchor the string */
luaH_finishset(L, ls->h, stv, o, stv); /* t[string] = string */
/* table is not a metatable, so it does not need to invalidate cache */
luaC_checkGC(L);
L->top--; /* remove string from stack */
}
else { /* string already present */
ts = keystrval(nodefromval(o)); /* re-use value previously stored */
}
L->top--; /* remove string from stack */
return ts;
}
@ -255,9 +257,10 @@ static int read_numeral (LexState *ls, SemInfo *seminfo) {
/*
** reads a sequence '[=*[' or ']=*]', leaving the last bracket.
** If sequence is well formed, return its number of '='s + 2; otherwise,
** return 1 if there is no '='s or 0 otherwise (an unfinished '[==...').
** read a sequence '[=*[' or ']=*]', leaving the last bracket. If
** sequence is well formed, return its number of '='s + 2; otherwise,
** return 1 if it is a single bracket (no '='s and no 2nd bracket);
** otherwise (an unfinished '[==...') return 0.
*/
static size_t skip_sep (LexState *ls) {
size_t count = 0;
@ -482,34 +485,34 @@ static int llex (LexState *ls, SemInfo *seminfo) {
}
case '=': {
next(ls);
if (check_next1(ls, '=')) return TK_EQ;
if (check_next1(ls, '=')) return TK_EQ; /* '==' */
else return '=';
}
case '<': {
next(ls);
if (check_next1(ls, '=')) return TK_LE;
else if (check_next1(ls, '<')) return TK_SHL;
if (check_next1(ls, '=')) return TK_LE; /* '<=' */
else if (check_next1(ls, '<')) return TK_SHL; /* '<<' */
else return '<';
}
case '>': {
next(ls);
if (check_next1(ls, '=')) return TK_GE;
else if (check_next1(ls, '>')) return TK_SHR;
if (check_next1(ls, '=')) return TK_GE; /* '>=' */
else if (check_next1(ls, '>')) return TK_SHR; /* '>>' */
else return '>';
}
case '/': {
next(ls);
if (check_next1(ls, '/')) return TK_IDIV;
if (check_next1(ls, '/')) return TK_IDIV; /* '//' */
else return '/';
}
case '~': {
next(ls);
if (check_next1(ls, '=')) return TK_NE;
if (check_next1(ls, '=')) return TK_NE; /* '~=' */
else return '~';
}
case ':': {
next(ls);
if (check_next1(ls, ':')) return TK_DBCOLON;
if (check_next1(ls, ':')) return TK_DBCOLON; /* '::' */
else return ':';
}
case '"': case '\'': { /* short literal strings */
@ -548,7 +551,7 @@ static int llex (LexState *ls, SemInfo *seminfo) {
return TK_NAME;
}
}
else { /* single-char tokens (+ - / ...) */
else { /* single-char tokens ('+', '*', '%', '{', '}', ...) */
int c = ls->current;
next(ls);
return c;

8
lua/src/llex.h
View file

@ -7,11 +7,17 @@
#ifndef llex_h
#define llex_h
#include <limits.h>
#include "lobject.h"
#include "lzio.h"
#define FIRST_RESERVED 257
/*
** Single-char tokens (terminal symbols) are represented by their own
** numeric code. Other tokens start at the following value.
*/
#define FIRST_RESERVED (UCHAR_MAX + 1)
#if !defined(LUA_ENV)

42
lua/src/llimits.h
View file

@ -84,7 +84,15 @@ typedef LUAI_UACNUMBER l_uacNumber;
typedef LUAI_UACINT l_uacInt;
/* internal assertions for in-house debugging */
/*
** Internal assertions for in-house debugging
*/
#if defined LUAI_ASSERT
#undef NDEBUG
#include <assert.h>
#define lua_assert(c) assert(c)
#endif
#if defined(lua_assert)
#define check_exp(c,e) (lua_assert(c), (e))
/* to avoid problems with conditions too long */
@ -141,22 +149,6 @@ typedef LUAI_UACINT l_uacInt;
#endif
/*
** macros to improve jump prediction (used mainly for error handling)
*/
#if !defined(likely)
#if defined(__GNUC__)
#define likely(x) (__builtin_expect(((x) != 0), 1))
#define unlikely(x) (__builtin_expect(((x) != 0), 0))
#else
#define likely(x) (x)
#define unlikely(x) (x)
#endif
#endif
/*
** non-return type
*/
@ -226,6 +218,17 @@ typedef l_uint32 Instruction;
#endif
/*
** Maximum depth for nested C calls, syntactical nested non-terminals,
** and other features implemented through recursion in C. (Value must
** fit in a 16-bit unsigned integer. It must also be compatible with
** the size of the C stack.)
*/
#if !defined(LUAI_MAXCCALLS)
#define LUAI_MAXCCALLS 200
#endif
/*
** macros that are executed whenever program enters the Lua core
** ('lua_lock') and leaves the core ('lua_unlock')
@ -307,7 +310,8 @@ typedef l_uint32 Instruction;
/* exponentiation */
#if !defined(luai_numpow)
#define luai_numpow(L,a,b) ((void)L, l_mathop(pow)(a,b))
#define luai_numpow(L,a,b) \
((void)L, (b == 2) ? (a)*(a) : l_mathop(pow)(a,b))
#endif
/* the others are quite standard operations */
@ -336,7 +340,7 @@ typedef l_uint32 Instruction;
#else
/* realloc stack keeping its size */
#define condmovestack(L,pre,pos) \
{ int sz_ = (L)->stacksize; pre; luaD_reallocstack((L), sz_, 0); pos; }
{ int sz_ = stacksize(L); pre; luaD_reallocstack((L), sz_, 0); pos; }
#endif
#if !defined(HARDMEMTESTS)

5
lua/src/lmathlib.c
View file

@ -73,7 +73,7 @@ static int math_atan (lua_State *L) {
static int math_toint (lua_State *L) {
int valid;
lua_Integer n = lua_tointegerx(L, 1, &valid);
if (valid)
if (l_likely(valid))
lua_pushinteger(L, n);
else {
luaL_checkany(L, 1);
@ -175,7 +175,8 @@ static int math_log (lua_State *L) {
lua_Number base = luaL_checknumber(L, 2);
#if !defined(LUA_USE_C89)
if (base == l_mathop(2.0))
res = l_mathop(log2)(x); else
res = l_mathop(log2)(x);
else
#endif
if (base == l_mathop(10.0))
res = l_mathop(log10)(x);

35
lua/src/lmem.c
View file

@ -22,14 +22,14 @@
#include "lstate.h"
#if defined(HARDMEMTESTS)
#if defined(EMERGENCYGCTESTS)
/*
** First allocation will fail whenever not building initial state
** and not shrinking a block. (This fail will trigger 'tryagain' and
** a full GC cycle at every allocation.)
** First allocation will fail whenever not building initial state.
** (This fail will trigger 'tryagain' and a full GC cycle at every
** allocation.)
*/
static void *firsttry (global_State *g, void *block, size_t os, size_t ns) {
if (ttisnil(&g->nilvalue) && ns > os)
if (completestate(g) && ns > 0) /* frees never fail */
return NULL; /* fail */
else /* normal allocation */
return (*g->frealloc)(g->ud, block, os, ns);
@ -83,7 +83,7 @@ void *luaM_growaux_ (lua_State *L, void *block, int nelems, int *psize,
if (nelems + 1 <= size) /* does one extra element still fit? */
return block; /* nothing to be done */
if (size >= limit / 2) { /* cannot double it? */
if (unlikely(size >= limit)) /* cannot grow even a little? */
if (l_unlikely(size >= limit)) /* cannot grow even a little? */
luaG_runerror(L, "too many %s (limit is %d)", what, limit);
size = limit; /* still have at least one free place */
}
@ -138,15 +138,17 @@ void luaM_free_ (lua_State *L, void *block, size_t osize) {
/*
** In case of allocation fail, this function will call the GC to try
** to free some memory and then try the allocation again.
** (It should not be called when shrinking a block, because then the
** interpreter may be in the middle of a collection step.)
** In case of allocation fail, this function will do an emergency
** collection to free some memory and then try the allocation again.
** The GC should not be called while state is not fully built, as the
** collector is not yet fully initialized. Also, it should not be called
** when 'gcstopem' is true, because then the interpreter is in the
** middle of a collection step.
*/
static void *tryagain (lua_State *L, void *block,
size_t osize, size_t nsize) {
global_State *g = G(L);
if (ttisnil(&g->nilvalue)) { /* is state fully build? */
if (completestate(g) && !g->gcstopem) {
luaC_fullgc(L, 1); /* try to free some memory... */
return (*g->frealloc)(g->ud, block, osize, nsize); /* try again */
}
@ -156,17 +158,14 @@ static void *tryagain (lua_State *L, void *block,
/*
** Generic allocation routine.
** If allocation fails while shrinking a block, do not try again; the
** GC shrinks some blocks and it is not reentrant.
*/
void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
void *newblock;
global_State *g = G(L);
lua_assert((osize == 0) == (block == NULL));
newblock = firsttry(g, block, osize, nsize);
if (unlikely(newblock == NULL && nsize > 0)) {
if (nsize > osize) /* not shrinking a block? */
newblock = tryagain(L, block, osize, nsize);
if (l_unlikely(newblock == NULL && nsize > 0)) {
newblock = tryagain(L, block, osize, nsize);
if (newblock == NULL) /* still no memory? */
return NULL; /* do not update 'GCdebt' */
}
@ -179,7 +178,7 @@ void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
void *luaM_saferealloc_ (lua_State *L, void *block, size_t osize,
size_t nsize) {
void *newblock = luaM_realloc_(L, block, osize, nsize);
if (unlikely(newblock == NULL && nsize > 0)) /* allocation failed? */
if (l_unlikely(newblock == NULL && nsize > 0)) /* allocation failed? */
luaM_error(L);
return newblock;
}
@ -191,7 +190,7 @@ void *luaM_malloc_ (lua_State *L, size_t size, int tag) {
else {
global_State *g = G(L);
void *newblock = firsttry(g, NULL, tag, size);
if (unlikely(newblock == NULL)) {
if (l_unlikely(newblock == NULL)) {
newblock = tryagain(L, NULL, tag, size);
if (newblock == NULL)
luaM_error(L);

17
lua/src/loadlib.c
View file

@ -132,14 +132,16 @@ static void lsys_unloadlib (void *lib) {
static void *lsys_load (lua_State *L, const char *path, int seeglb) {
void *lib = dlopen(path, RTLD_NOW | (seeglb ? RTLD_GLOBAL : RTLD_LOCAL));
if (lib == NULL) lua_pushstring(L, dlerror());
if (l_unlikely(lib == NULL))
lua_pushstring(L, dlerror());
return lib;
}
static lua_CFunction lsys_sym (lua_State *L, void *lib, const char *sym) {
lua_CFunction f = cast_func(dlsym(lib, sym));
if (f == NULL) lua_pushstring(L, dlerror());
if (l_unlikely(f == NULL))
lua_pushstring(L, dlerror());
return f;
}
@ -410,7 +412,7 @@ static int ll_loadlib (lua_State *L) {
const char *path = luaL_checkstring(L, 1);
const char *init = luaL_checkstring(L, 2);
int stat = lookforfunc(L, path, init);
if (stat == 0) /* no errors? */
if (l_likely(stat == 0)) /* no errors? */
return 1; /* return the loaded function */
else { /* error; error message is on stack top */
luaL_pushfail(L);
@ -523,14 +525,14 @@ static const char *findfile (lua_State *L, const char *name,
const char *path;
lua_getfield(L, lua_upvalueindex(1), pname);
path = lua_tostring(L, -1);
if (path == NULL)
if (l_unlikely(path == NULL))
luaL_error(L, "'package.%s' must be a string", pname);
return searchpath(L, name, path, ".", dirsep);
}
static int checkload (lua_State *L, int stat, const char *filename) {
if (stat) { /* module loaded successfully? */
if (l_likely(stat)) { /* module loaded successfully? */
lua_pushstring(L, filename); /* will be 2nd argument to module */
return 2; /* return open function and file name */
}
@ -623,13 +625,14 @@ static void findloader (lua_State *L, const char *name) {
int i;
luaL_Buffer msg; /* to build error message */
/* push 'package.searchers' to index 3 in the stack */
if (lua_getfield(L, lua_upvalueindex(1), "searchers") != LUA_TTABLE)
if (l_unlikely(lua_getfield(L, lua_upvalueindex(1), "searchers")
!= LUA_TTABLE))
luaL_error(L, "'package.searchers' must be a table");
luaL_buffinit(L, &msg);
/* iterate over available searchers to find a loader */
for (i = 1; ; i++) {
luaL_addstring(&msg, "\n\t"); /* error-message prefix */
if (lua_rawgeti(L, 3, i) == LUA_TNIL) { /* no more searchers? */
if (l_unlikely(lua_rawgeti(L, 3, i) == LUA_TNIL)) { /* no more searchers? */
lua_pop(L, 1); /* remove nil */
luaL_buffsub(&msg, 2); /* remove prefix */
luaL_pushresult(&msg); /* create error message */

51
lua/src/lobject.c
View file

@ -215,37 +215,42 @@ static lua_Number lua_strx2number (const char *s, char **endptr) {
/* }====================================================== */
/* maximum length of a numeral */
/* maximum length of a numeral to be converted to a number */
#if !defined (L_MAXLENNUM)
#define L_MAXLENNUM 200
#endif
/*
** Convert string 's' to a Lua number (put in 'result'). Return NULL on
** fail or the address of the ending '\0' on success. ('mode' == 'x')
** means a hexadecimal numeral.
*/
static const char *l_str2dloc (const char *s, lua_Number *result, int mode) {
char *endptr;
*result = (mode == 'x') ? lua_strx2number(s, &endptr) /* try to convert */
: lua_str2number(s, &endptr);
if (endptr == s) return NULL; /* nothing recognized? */
while (lisspace(cast_uchar(*endptr))) endptr++; /* skip trailing spaces */
return (*endptr == '\0') ? endptr : NULL; /* OK if no trailing characters */
return (*endptr == '\0') ? endptr : NULL; /* OK iff no trailing chars */
}
/*
** Convert string 's' to a Lua number (put in 'result'). Return NULL
** on fail or the address of the ending '\0' on success.
** 'pmode' points to (and 'mode' contains) special things in the string:
** - 'x'/'X' means a hexadecimal numeral
** - 'n'/'N' means 'inf' or 'nan' (which should be rejected)
** - '.' just optimizes the search for the common case (nothing special)
** Convert string 's' to a Lua number (put in 'result') handling the
** current locale.
** This function accepts both the current locale or a dot as the radix
** mark. If the conversion fails, it may mean number has a dot but
** locale accepts something else. In that case, the code copies 's'
** to a buffer (because 's' is read-only), changes the dot to the
** current locale radix mark, and tries to convert again.
** The variable 'mode' checks for special characters in the string:
** - 'n' means 'inf' or 'nan' (which should be rejected)
** - 'x' means a hexadecimal numeral
** - '.' just optimizes the search for the common case (no special chars)
*/
static const char *l_str2d (const char *s, lua_Number *result) {
const char *endptr;
const char *pmode = strpbrk(s, ".xXnN");
const char *pmode = strpbrk(s, ".xXnN"); /* look for special chars */
int mode = pmode ? ltolower(cast_uchar(*pmode)) : 0;
if (mode == 'n') /* reject 'inf' and 'nan' */
return NULL;
@ -253,7 +258,7 @@ static const char *l_str2d (const char *s, lua_Number *result) {
if (endptr == NULL) { /* failed? may be a different locale */
char buff[L_MAXLENNUM + 1];
const char *pdot = strchr(s, '.');
if (strlen(s) > L_MAXLENNUM || pdot == NULL)
if (pdot == NULL || strlen(s) > L_MAXLENNUM)
return NULL; /* string too long or no dot; fail */
strcpy(buff, s); /* copy string to buffer */
buff[pdot - s] = lua_getlocaledecpoint(); /* correct decimal point */
@ -333,8 +338,15 @@ int luaO_utf8esc (char *buff, unsigned long x) {
}
/* maximum length of the conversion of a number to a string */
#define MAXNUMBER2STR 50
/*
** Maximum length of the conversion of a number to a string. Must be
** enough to accommodate both LUA_INTEGER_FMT and LUA_NUMBER_FMT.
** (For a long long int, this is 19 digits plus a sign and a final '\0',
** adding to 21. For a long double, it can go to a sign, 33 digits,
** the dot, an exponent letter, an exponent sign, 5 exponent digits,
** and a final '\0', adding to 43.)
*/
#define MAXNUMBER2STR 44
/*
@ -375,7 +387,7 @@ void luaO_tostring (lua_State *L, TValue *obj) {
*/
/* size for buffer space used by 'luaO_pushvfstring' */
#define BUFVFS 400
#define BUFVFS 200
/* buffer used by 'luaO_pushvfstring' */
typedef struct BuffFS {
@ -387,18 +399,16 @@ typedef struct BuffFS {
/*
** Push given string to the stack, as part of the buffer. If the stack
** is almost full, join all partial strings in the stack into one.
** Push given string to the stack, as part of the buffer, and
** join the partial strings in the stack into one.
*/
static void pushstr (BuffFS *buff, const char *str, size_t l) {
lua_State *L = buff->L;
setsvalue2s(L, L->top, luaS_newlstr(L, str, l));
L->top++; /* may use one extra slot */
buff->pushed++;
if (buff->pushed > 1 && L->top + 1 >= L->stack_last) {
luaV_concat(L, buff->pushed); /* join all partial results into one */
buff->pushed = 1;
}
luaV_concat(L, buff->pushed); /* join partial results into one */
buff->pushed = 1;
}
@ -521,8 +531,7 @@ const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
}
addstr2buff(&buff, fmt, strlen(fmt)); /* rest of 'fmt' */
clearbuff(&buff); /* empty buffer into the stack */
if (buff.pushed > 1)
luaV_concat(L, buff.pushed); /* join all partial results */
lua_assert(buff.pushed == 1);
return svalue(s2v(L->top - 1));
}

41
lua/src/lobject.h
View file

@ -21,10 +21,12 @@
*/
#define LUA_TUPVAL LUA_NUMTYPES /* upvalues */
#define LUA_TPROTO (LUA_NUMTYPES+1) /* function prototypes */
#define LUA_TDEADKEY (LUA_NUMTYPES+2) /* removed keys in tables */
/*
** number of all possible types (including LUA_TNONE)
** number of all possible types (including LUA_TNONE but excluding DEADKEY)
*/
#define LUA_TOTALTYPES (LUA_TPROTO + 2)
@ -96,7 +98,8 @@ typedef struct TValue {
/*
** Any value being manipulated by the program either is non
** collectable, or the collectable object has the right tag
** and it is not dead.
** and it is not dead. The option 'L == NULL' allows other
** macros using this one to be used where L is not available.
*/
#define checkliveness(L,obj) \
((void)L, lua_longassert(!iscollectable(obj) || \
@ -133,10 +136,19 @@ typedef struct TValue {
/*
** Entries in the Lua stack
** Entries in a Lua stack. Field 'tbclist' forms a list of all
** to-be-closed variables active in this stack. Dummy entries are
** used when the distance between two tbc variables does not fit
** in an unsigned short. They are represented by delta==0, and
** their real delta is always the maximum value that fits in
** that field.
*/
typedef union StackValue {
TValue val;
struct {
TValuefields;
unsigned short delta;
} tbclist;
} StackValue;
@ -554,7 +566,7 @@ typedef struct Proto {
/*
** {==================================================================
** Closures
** Functions
** ===================================================================
*/
@ -567,10 +579,11 @@ typedef struct Proto {
#define LUA_VCCL makevariant(LUA_TFUNCTION, 2) /* C closure */
#define ttisfunction(o) checktype(o, LUA_TFUNCTION)
#define ttisclosure(o) ((rawtt(o) & 0x1F) == LUA_VLCL)
#define ttisLclosure(o) checktag((o), ctb(LUA_VLCL))
#define ttislcf(o) checktag((o), LUA_VLCF)
#define ttisCclosure(o) checktag((o), ctb(LUA_VCCL))
#define ttisclosure(o) (ttisLclosure(o) || ttisCclosure(o))
#define isLfunction(o) ttisLclosure(o)
@ -703,9 +716,9 @@ typedef union Node {
*/
#define BITRAS (1 << 7)
#define isrealasize(t) (!((t)->marked & BITRAS))
#define setrealasize(t) ((t)->marked &= cast_byte(~BITRAS))
#define setnorealasize(t) ((t)->marked |= BITRAS)
#define isrealasize(t) (!((t)->flags & BITRAS))
#define setrealasize(t) ((t)->flags &= cast_byte(~BITRAS))
#define setnorealasize(t) ((t)->flags |= BITRAS)
typedef struct Table {
@ -742,13 +755,13 @@ typedef struct Table {
/*
** Use a "nil table" to mark dead keys in a table. Those keys serve
** to keep space for removed entries, which may still be part of
** chains. Note that the 'keytt' does not have the BIT_ISCOLLECTABLE
** set, so these values are considered not collectable and are different
** from any valid value.
** Dead keys in tables have the tag DEADKEY but keep their original
** gcvalue. This distinguishes them from regular keys but allows them to
** be found when searched in a special way. ('next' needs that to find
** keys removed from a table during a traversal.)
*/
#define setdeadkey(n) (keytt(n) = LUA_TTABLE, gckey(n) = NULL)
#define setdeadkey(node) (keytt(node) = LUA_TDEADKEY)
#define keyisdead(node) (keytt(node) == LUA_TDEADKEY)
/* }================================================================== */

18
lua/src/lopcodes.h
View file

@ -225,13 +225,13 @@ OP_SELF,/* A B C R[A+1] := R[B]; R[A] := R[B][RK(C):string] */
OP_ADDI,/* A B sC R[A] := R[B] + sC */
OP_ADDK,/* A B C R[A] := R[B] + K[C] */
OP_SUBK,/* A B C R[A] := R[B] - K[C] */
OP_MULK,/* A B C R[A] := R[B] * K[C] */
OP_MODK,/* A B C R[A] := R[B] % K[C] */
OP_POWK,/* A B C R[A] := R[B] ^ K[C] */
OP_DIVK,/* A B C R[A] := R[B] / K[C] */
OP_IDIVK,/* A B C R[A] := R[B] // K[C] */
OP_ADDK,/* A B C R[A] := R[B] + K[C]:number */
OP_SUBK,/* A B C R[A] := R[B] - K[C]:number */
OP_MULK,/* A B C R[A] := R[B] * K[C]:number */
OP_MODK,/* A B C R[A] := R[B] % K[C]:number */
OP_POWK,/* A B C R[A] := R[B] ^ K[C]:number */
OP_DIVK,/* A B C R[A] := R[B] / K[C]:number */
OP_IDIVK,/* A B C R[A] := R[B] // K[C]:number */
OP_BANDK,/* A B C R[A] := R[B] & K[C]:integer */
OP_BORK,/* A B C R[A] := R[B] | K[C]:integer */
@ -261,7 +261,7 @@ OP_MMBINK,/* A B C k call C metamethod over R[A] and K[B] */
OP_UNM,/* A B R[A] := -R[B] */
OP_BNOT,/* A B R[A] := ~R[B] */
OP_NOT,/* A B R[A] := not R[B] */
OP_LEN,/* A B R[A] := length of R[B] */
OP_LEN,/* A B R[A] := #R[B] (length operator) */
OP_CONCAT,/* A B R[A] := R[A].. ... ..R[A + B - 1] */
@ -297,7 +297,7 @@ OP_TFORPREP,/* A Bx create upvalue for R[A + 3]; pc+=Bx */
OP_TFORCALL,/* A C R[A+4], ... ,R[A+3+C] := R[A](R[A+1], R[A+2]); */
OP_TFORLOOP,/* A Bx if R[A+2] ~= nil then { R[A]=R[A+2]; pc -= Bx } */
OP_SETLIST,/* A B C k R[A][(C-1)*FPF+i] := R[A+i], 1 <= i <= B */
OP_SETLIST,/* A B C k R[A][C+i] := R[A+i], 1 <= i <= B */
OP_CLOSURE,/* A Bx R[A] := closure(KPROTO[Bx]) */

8
lua/src/loslib.c
View file

@ -170,7 +170,7 @@ static int os_tmpname (lua_State *L) {
char buff[LUA_TMPNAMBUFSIZE];
int err;
lua_tmpnam(buff, err);
if (err)
if (l_unlikely(err))
return luaL_error(L, "unable to generate a unique filename");
lua_pushstring(L, buff);
return 1;
@ -208,7 +208,7 @@ static int os_clock (lua_State *L) {
*/
static void setfield (lua_State *L, const char *key, int value, int delta) {
#if (defined(LUA_NUMTIME) && LUA_MAXINTEGER <= INT_MAX)
if (value > LUA_MAXINTEGER - delta)
if (l_unlikely(value > LUA_MAXINTEGER - delta))
luaL_error(L, "field '%s' is out-of-bound", key);
#endif
lua_pushinteger(L, (lua_Integer)value + delta);
@ -253,9 +253,9 @@ static int getfield (lua_State *L, const char *key, int d, int delta) {
int t = lua_getfield(L, -1, key); /* get field and its type */
lua_Integer res = lua_tointegerx(L, -1, &isnum);
if (!isnum) { /* field is not an integer? */
if (t != LUA_TNIL) /* some other value? */
if (l_unlikely(t != LUA_TNIL)) /* some other value? */
return luaL_error(L, "field '%s' is not an integer", key);
else if (d < 0) /* absent field; no default? */
else if (l_unlikely(d < 0)) /* absent field; no default? */
return luaL_error(L, "field '%s' missing in date table", key);
res = d;
}

120
lua/src/lparser.c
View file

@ -128,7 +128,7 @@ static void checknext (LexState *ls, int c) {
** in line 'where' (if that is not the current line).
*/
static void check_match (LexState *ls, int what, int who, int where) {
if (unlikely(!testnext(ls, what))) {
if (l_unlikely(!testnext(ls, what))) {
if (where == ls->linenumber) /* all in the same line? */
error_expected(ls, what); /* do not need a complex message */
else {
@ -222,26 +222,26 @@ static Vardesc *getlocalvardesc (FuncState *fs, int vidx) {
/*
** Convert 'nvar', a compiler index level, to it corresponding
** stack index level. For that, search for the highest variable
** below that level that is in the stack and uses its stack
** index ('sidx').
** Convert 'nvar', a compiler index level, to its corresponding
** register. For that, search for the highest variable below that level
** that is in a register and uses its register index ('ridx') plus one.
*/
static int stacklevel (FuncState *fs, int nvar) {
static int reglevel (FuncState *fs, int nvar) {
while (nvar-- > 0) {
Vardesc *vd = getlocalvardesc(fs, nvar); /* get variable */
if (vd->vd.kind != RDKCTC) /* is in the stack? */
return vd->vd.sidx + 1;
Vardesc *vd = getlocalvardesc(fs, nvar); /* get previous variable */
if (vd->vd.kind != RDKCTC) /* is in a register? */
return vd->vd.ridx + 1;
}
return 0; /* no variables in the stack */
return 0; /* no variables in registers */
}
/*
** Return the number of variables in the stack for function 'fs'
** Return the number of variables in the register stack for the given
** function.
*/
int luaY_nvarstack (FuncState *fs) {
return stacklevel(fs, fs->nactvar);
return reglevel(fs, fs->nactvar);
}
@ -267,7 +267,7 @@ static void init_var (FuncState *fs, expdesc *e, int vidx) {
e->f = e->t = NO_JUMP;
e->k = VLOCAL;
e->u.var.vidx = vidx;
e->u.var.sidx = getlocalvardesc(fs, vidx)->vd.sidx;
e->u.var.ridx = getlocalvardesc(fs, vidx)->vd.ridx;
}
@ -310,12 +310,12 @@ static void check_readonly (LexState *ls, expdesc *e) {
*/
static void adjustlocalvars (LexState *ls, int nvars) {
FuncState *fs = ls->fs;
int stklevel = luaY_nvarstack(fs);
int reglevel = luaY_nvarstack(fs);
int i;
for (i = 0; i < nvars; i++) {
int vidx = fs->nactvar++;
Vardesc *var = getlocalvardesc(fs, vidx);
var->vd.sidx = stklevel++;
var->vd.ridx = reglevel++;
var->vd.pidx = registerlocalvar(ls, fs, var->vd.name);
}
}
@ -366,7 +366,7 @@ static int newupvalue (FuncState *fs, TString *name, expdesc *v) {
FuncState *prev = fs->prev;
if (v->k == VLOCAL) {
up->instack = 1;
up->idx = v->u.var.sidx;
up->idx = v->u.var.ridx;
up->kind = getlocalvardesc(prev, v->u.var.vidx)->vd.kind;
lua_assert(eqstr(name, getlocalvardesc(prev, v->u.var.vidx)->vd.name));
}
@ -489,12 +489,10 @@ static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {
}
/*
** Macros to limit the maximum recursion depth while parsing
*/
#define enterlevel(ls) luaE_enterCcall((ls)->L)
#define enterlevel(ls) luaE_incCstack(ls->L)
#define leavelevel(ls) luaE_exitCcall((ls)->L)
#define leavelevel(ls) ((ls)->L->nCcalls--)
/*
@ -519,7 +517,7 @@ static void solvegoto (LexState *ls, int g, Labeldesc *label) {
Labellist *gl = &ls->dyd->gt; /* list of goto's */
Labeldesc *gt = &gl->arr[g]; /* goto to be resolved */
lua_assert(eqstr(gt->name, label->name));
if (unlikely(gt->nactvar < label->nactvar)) /* enter some scope? */
if (l_unlikely(gt->nactvar < label->nactvar)) /* enter some scope? */
jumpscopeerror(ls, gt);
luaK_patchlist(ls->fs, gt->pc, label->pc);
for (i = g; i < gl->n - 1; i++) /* remove goto from pending list */
@ -622,7 +620,7 @@ static void movegotosout (FuncState *fs, BlockCnt *bl) {
for (i = bl->firstgoto; i < gl->n; i++) { /* for each pending goto */
Labeldesc *gt = &gl->arr[i];
/* leaving a variable scope? */
if (stacklevel(fs, gt->nactvar) > stacklevel(fs, bl->nactvar))
if (reglevel(fs, gt->nactvar) > reglevel(fs, bl->nactvar))
gt->close |= bl->upval; /* jump may need a close */
gt->nactvar = bl->nactvar; /* update goto level */
}
@ -663,7 +661,7 @@ static void leaveblock (FuncState *fs) {
BlockCnt *bl = fs->bl;
LexState *ls = fs->ls;
int hasclose = 0;
int stklevel = stacklevel(fs, bl->nactvar); /* level outside the block */
int stklevel = reglevel(fs, bl->nactvar); /* level outside the block */
if (bl->isloop) /* fix pending breaks? */
hasclose = createlabel(ls, luaS_newliteral(ls->L, "break"), 0, 0);
if (!hasclose && bl->previous && bl->upval)
@ -947,7 +945,7 @@ static void setvararg (FuncState *fs, int nparams) {
static void parlist (LexState *ls) {
/* parlist -> [ param { ',' param } ] */
/* parlist -> [ {NAME ','} (NAME | '...') ] */
FuncState *fs = ls->fs;
Proto *f = fs->f;
int nparams = 0;
@ -955,12 +953,12 @@ static void parlist (LexState *ls) {
if (ls->t.token != ')') { /* is 'parlist' not empty? */
do {
switch (ls->t.token) {
case TK_NAME: { /* param -> NAME */
case TK_NAME: {
new_localvar(ls, str_checkname(ls));
nparams++;
break;
}
case TK_DOTS: { /* param -> '...' */
case TK_DOTS: {
luaX_next(ls);
isvararg = 1;
break;
@ -1332,13 +1330,13 @@ static void check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v) {
}
}
else { /* table is a register */
if (v->k == VLOCAL && lh->v.u.ind.t == v->u.var.sidx) {
if (v->k == VLOCAL && lh->v.u.ind.t == v->u.var.ridx) {
conflict = 1; /* table is the local being assigned now */
lh->v.u.ind.t = extra; /* assignment will use safe copy */
}
/* is index the local being assigned? */
if (lh->v.k == VINDEXED && v->k == VLOCAL &&
lh->v.u.ind.idx == v->u.var.sidx) {
lh->v.u.ind.idx == v->u.var.ridx) {
conflict = 1;
lh->v.u.ind.idx = extra; /* previous assignment will use safe copy */
}
@ -1348,7 +1346,7 @@ static void check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v) {
if (conflict) {
/* copy upvalue/local value to a temporary (in position 'extra') */
if (v->k == VLOCAL)
luaK_codeABC(fs, OP_MOVE, extra, v->u.var.sidx, 0);
luaK_codeABC(fs, OP_MOVE, extra, v->u.var.ridx, 0);
else
luaK_codeABC(fs, OP_GETUPVAL, extra, v->u.info, 0);
luaK_reserveregs(fs, 1);
@ -1413,7 +1411,7 @@ static void gotostat (LexState *ls) {
newgotoentry(ls, name, line, luaK_jump(fs));
else { /* found a label */
/* backward jump; will be resolved here */
int lblevel = stacklevel(fs, lb->nactvar); /* label level */
int lblevel = reglevel(fs, lb->nactvar); /* label level */
if (luaY_nvarstack(fs) > lblevel) /* leaving the scope of a variable? */
luaK_codeABC(fs, OP_CLOSE, lblevel, 0, 0);
/* create jump and link it to the label */
@ -1437,7 +1435,7 @@ static void breakstat (LexState *ls) {
*/
static void checkrepeated (LexState *ls, TString *name) {
Labeldesc *lb = findlabel(ls, name);
if (unlikely(lb != NULL)) { /* already defined? */
if (l_unlikely(lb != NULL)) { /* already defined? */
const char *msg = "label '%s' already defined on line %d";
msg = luaO_pushfstring(ls->L, msg, getstr(name), lb->line);
luaK_semerror(ls, msg); /* error */
@ -1490,7 +1488,7 @@ static void repeatstat (LexState *ls, int line) {
if (bl2.upval) { /* upvalues? */
int exit = luaK_jump(fs); /* normal exit must jump over fix */
luaK_patchtohere(fs, condexit); /* repetition must close upvalues */
luaK_codeABC(fs, OP_CLOSE, stacklevel(fs, bl2.nactvar), 0, 0);
luaK_codeABC(fs, OP_CLOSE, reglevel(fs, bl2.nactvar), 0, 0);
condexit = luaK_jump(fs); /* repeat after closing upvalues */
luaK_patchtohere(fs, exit); /* normal exit comes to here */
}
@ -1522,7 +1520,7 @@ static void fixforjump (FuncState *fs, int pc, int dest, int back) {
int offset = dest - (pc + 1);
if (back)
offset = -offset;
if (unlikely(offset > MAXARG_Bx))
if (l_unlikely(offset > MAXARG_Bx))
luaX_syntaxerror(fs->ls, "control structure too long");
SETARG_Bx(*jmp, offset);
}
@ -1625,59 +1623,21 @@ static void forstat (LexState *ls, int line) {
}
/*
** Check whether next instruction is a single jump (a 'break', a 'goto'
** to a forward label, or a 'goto' to a backward label with no variable
** to close). If so, set the name of the 'label' it is jumping to
** ("break" for a 'break') or to where it is jumping to ('target') and
** return true. If not a single jump, leave input unchanged, to be
** handled as a regular statement.
*/
static int issinglejump (LexState *ls, TString **label, int *target) {
if (testnext(ls, TK_BREAK)) { /* a break? */
*label = luaS_newliteral(ls->L, "break");
return 1;
}
else if (ls->t.token != TK_GOTO || luaX_lookahead(ls) != TK_NAME)
return 0; /* not a valid goto */
else {
TString *lname = ls->lookahead.seminfo.ts; /* label's id */
Labeldesc *lb = findlabel(ls, lname);
if (lb) { /* a backward jump? */
/* does it need to close variables? */
if (luaY_nvarstack(ls->fs) > stacklevel(ls->fs, lb->nactvar))
return 0; /* not a single jump; cannot optimize */
*target = lb->pc;
}
else /* jump forward */
*label = lname;
luaX_next(ls); /* skip goto */
luaX_next(ls); /* skip name */
return 1;
}
}
static void test_then_block (LexState *ls, int *escapelist) {
/* test_then_block -> [IF | ELSEIF] cond THEN block */
BlockCnt bl;
int line;
FuncState *fs = ls->fs;
TString *jlb = NULL;
int target = NO_JUMP;
expdesc v;
int jf; /* instruction to skip 'then' code (if condition is false) */
luaX_next(ls); /* skip IF or ELSEIF */
expr(ls, &v); /* read condition */
checknext(ls, TK_THEN);
line = ls->linenumber;
if (issinglejump(ls, &jlb, &target)) { /* 'if x then goto' ? */
luaK_goiffalse(ls->fs, &v); /* will jump to label if condition is true */
if (ls->t.token == TK_BREAK) { /* 'if x then break' ? */
int line = ls->linenumber;
luaK_goiffalse(ls->fs, &v); /* will jump if condition is true */
luaX_next(ls); /* skip 'break' */
enterblock(fs, &bl, 0); /* must enter block before 'goto' */
if (jlb != NULL) /* forward jump? */
newgotoentry(ls, jlb, line, v.t); /* will be resolved later */
else /* backward jump */
luaK_patchlist(fs, v.t, target); /* jump directly to 'target' */
newgotoentry(ls, luaS_newliteral(ls->L, "break"), line, v.t);
while (testnext(ls, ';')) {} /* skip semicolons */
if (block_follow(ls, 0)) { /* jump is the entire block? */
leaveblock(fs);
@ -1686,7 +1646,7 @@ static void test_then_block (LexState *ls, int *escapelist) {
else /* must skip over 'then' part if condition is false */
jf = luaK_jump(fs);
}
else { /* regular case (not a jump) */
else { /* regular case (not a break) */
luaK_goiftrue(ls->fs, &v); /* skip over block if condition is false */
enterblock(fs, &bl, 0);
jf = v.f;
@ -1748,13 +1708,13 @@ static void checktoclose (LexState *ls, int level) {
FuncState *fs = ls->fs;
markupval(fs, level + 1);
fs->bl->insidetbc = 1; /* in the scope of a to-be-closed variable */
luaK_codeABC(fs, OP_TBC, stacklevel(fs, level), 0, 0);
luaK_codeABC(fs, OP_TBC, reglevel(fs, level), 0, 0);
}
}
static void localstat (LexState *ls) {
/* stat -> LOCAL ATTRIB NAME {',' ATTRIB NAME} ['=' explist] */
/* stat -> LOCAL NAME ATTRIB { ',' NAME ATTRIB } ['=' explist] */
FuncState *fs = ls->fs;
int toclose = -1; /* index of to-be-closed variable (if any) */
Vardesc *var; /* last variable */

11
lua/src/lparser.h
View file

@ -23,7 +23,7 @@
/* kinds of variables/expressions */
typedef enum {
VVOID, /* when 'expdesc' describes the last expression a list,
VVOID, /* when 'expdesc' describes the last expression of a list,
this kind means an empty list (so, no expression) */
VNIL, /* constant nil */
VTRUE, /* constant true */
@ -35,10 +35,11 @@ typedef enum {
(string is fixed by the lexer) */
VNONRELOC, /* expression has its value in a fixed register;
info = result register */
VLOCAL, /* local variable; var.sidx = stack index (local register);
VLOCAL, /* local variable; var.ridx = register index;
var.vidx = relative index in 'actvar.arr' */
VUPVAL, /* upvalue variable; info = index of upvalue in 'upvalues' */
VCONST, /* compile-time constant; info = absolute index in 'actvar.arr' */
VCONST, /* compile-time <const> variable;
info = absolute index in 'actvar.arr' */
VINDEXED, /* indexed variable;
ind.t = table register;
ind.idx = key's R index */
@ -76,7 +77,7 @@ typedef struct expdesc {
lu_byte t; /* table (register or upvalue) */
} ind;
struct { /* for local variables */
lu_byte sidx; /* index in the stack */
lu_byte ridx; /* register holding the variable */
unsigned short vidx; /* compiler index (in 'actvar.arr') */
} var;
} u;
@ -96,7 +97,7 @@ typedef union Vardesc {
struct {
TValuefields; /* constant value (if it is a compile-time constant) */
lu_byte kind;
lu_byte sidx; /* index of the variable in the stack */
lu_byte ridx; /* register holding the variable */
short pidx; /* index of the variable in the Proto's 'locvars' array */
TString *name; /* variable name */
} vd;

162
lua/src/lstate.c
View file

@ -76,7 +76,7 @@ static unsigned int luai_makeseed (lua_State *L) {
addbuff(buff, p, &h); /* local variable */
addbuff(buff, p, &lua_newstate); /* public function */
lua_assert(p == sizeof(buff));
return luaS_hash(buff, p, h, 1);
return luaS_hash(buff, p, h);
}
#endif
@ -97,66 +97,14 @@ void luaE_setdebt (global_State *g, l_mem debt) {
LUA_API int lua_setcstacklimit (lua_State *L, unsigned int limit) {
global_State *g = G(L);
int ccalls;
luaE_freeCI(L); /* release unused CIs */
ccalls = getCcalls(L);
if (limit >= 40000)
return 0; /* out of bounds */
limit += CSTACKERR;
if (L != g-> mainthread)
return 0; /* only main thread can change the C stack */
else if (ccalls <= CSTACKERR)
return 0; /* handling overflow */
else {
int diff = limit - g->Cstacklimit;
if (ccalls + diff <= CSTACKERR)
return 0; /* new limit would cause an overflow */
g->Cstacklimit = limit; /* set new limit */
L->nCcalls += diff; /* correct 'nCcalls' */
return limit - diff - CSTACKERR; /* success; return previous limit */
}
}
/*
** Decrement count of "C calls" and check for overflows. In case of
** a stack overflow, check appropriate error ("regular" overflow or
** overflow while handling stack overflow). If 'nCcalls' is smaller
** than CSTACKERR but larger than CSTACKMARK, it means it has just
** entered the "overflow zone", so the function raises an overflow
** error. If 'nCcalls' is smaller than CSTACKMARK (which means it is
** already handling an overflow) but larger than CSTACKERRMARK, does
** not report an error (to allow message handling to work). Otherwise,
** report a stack overflow while handling a stack overflow (probably
** caused by a repeating error in the message handling function).
*/
void luaE_enterCcall (lua_State *L) {
int ncalls = getCcalls(L);
L->nCcalls--;
if (ncalls <= CSTACKERR) { /* possible overflow? */
luaE_freeCI(L); /* release unused CIs */
ncalls = getCcalls(L); /* update call count */
if (ncalls <= CSTACKERR) { /* still overflow? */
if (ncalls <= CSTACKERRMARK) /* below error-handling zone? */
luaD_throw(L, LUA_ERRERR); /* error while handling stack error */
else if (ncalls >= CSTACKMARK) {
/* not in error-handling zone; raise the error now */
L->nCcalls = (CSTACKMARK - 1); /* enter error-handling zone */
luaG_runerror(L, "C stack overflow");
}
/* else stack is in the error-handling zone;
allow message handler to work */
}
}
UNUSED(L); UNUSED(limit);
return LUAI_MAXCCALLS; /* warning?? */
}
CallInfo *luaE_extendCI (lua_State *L) {
CallInfo *ci;
lua_assert(L->ci->next == NULL);
luaE_enterCcall(L);
ci = luaM_new(L, CallInfo);
lua_assert(L->ci->next == NULL);
L->ci->next = ci;
@ -175,13 +123,11 @@ void luaE_freeCI (lua_State *L) {
CallInfo *ci = L->ci;
CallInfo *next = ci->next;
ci->next = NULL;
L->nCcalls += L->nci; /* add removed elements back to 'nCcalls' */
while ((ci = next) != NULL) {
next = ci->next;
luaM_free(L, ci);
L->nci--;
}
L->nCcalls -= L->nci; /* adjust result */
}
@ -194,7 +140,6 @@ void luaE_shrinkCI (lua_State *L) {
CallInfo *next;
if (ci == NULL)
return; /* no extra elements */
L->nCcalls += L->nci; /* add removed elements back to 'nCcalls' */
while ((next = ci->next) != NULL) { /* two extra elements? */
CallInfo *next2 = next->next; /* next's next */
ci->next = next2; /* remove next from the list */
@ -207,19 +152,40 @@ void luaE_shrinkCI (lua_State *L) {
ci = next2; /* continue */
}
}
L->nCcalls -= L->nci; /* adjust result */
}
/*
** Called when 'getCcalls(L)' larger or equal to LUAI_MAXCCALLS.
** If equal, raises an overflow error. If value is larger than
** LUAI_MAXCCALLS (which means it is handling an overflow) but
** not much larger, does not report an error (to allow overflow
** handling to work).
*/
void luaE_checkcstack (lua_State *L) {
if (getCcalls(L) == LUAI_MAXCCALLS)
luaG_runerror(L, "C stack overflow");
else if (getCcalls(L) >= (LUAI_MAXCCALLS / 10 * 11))
luaD_throw(L, LUA_ERRERR); /* error while handing stack error */
}
LUAI_FUNC void luaE_incCstack (lua_State *L) {
L->nCcalls++;
if (l_unlikely(getCcalls(L) >= LUAI_MAXCCALLS))
luaE_checkcstack(L);
}
static void stack_init (lua_State *L1, lua_State *L) {
int i; CallInfo *ci;
/* initialize stack array */
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE, StackValue);
L1->stacksize = BASIC_STACK_SIZE;
for (i = 0; i < BASIC_STACK_SIZE; i++)
L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, StackValue);
L1->tbclist = L1->stack;
for (i = 0; i < BASIC_STACK_SIZE + EXTRA_STACK; i++)
setnilvalue(s2v(L1->stack + i)); /* erase new stack */
L1->top = L1->stack;
L1->stack_last = L1->stack + L1->stacksize - EXTRA_STACK;
L1->stack_last = L1->stack + BASIC_STACK_SIZE;
/* initialize first ci */
ci = &L1->base_ci;
ci->next = ci->previous = NULL;
@ -240,7 +206,7 @@ static void freestack (lua_State *L) {
L->ci = &L->base_ci; /* free the entire 'ci' list */
luaE_freeCI(L);
lua_assert(L->nci == 0);
luaM_freearray(L, L->stack, L->stacksize); /* free stack array */
luaM_freearray(L, L->stack, stacksize(L) + EXTRA_STACK); /* free stack */
}
@ -248,24 +214,19 @@ static void freestack (lua_State *L) {
** Create registry table and its predefined values
*/
static void init_registry (lua_State *L, global_State *g) {
TValue temp;
/* create registry */
Table *registry = luaH_new(L);
sethvalue(L, &g->l_registry, registry);
luaH_resize(L, registry, LUA_RIDX_LAST, 0);
/* registry[LUA_RIDX_MAINTHREAD] = L */
setthvalue(L, &temp, L); /* temp = L */
luaH_setint(L, registry, LUA_RIDX_MAINTHREAD, &temp);
/* registry[LUA_RIDX_GLOBALS] = table of globals */
sethvalue(L, &temp, luaH_new(L)); /* temp = new table (global table) */
luaH_setint(L, registry, LUA_RIDX_GLOBALS, &temp);
setthvalue(L, &registry->array[LUA_RIDX_MAINTHREAD - 1], L);
/* registry[LUA_RIDX_GLOBALS] = new table (table of globals) */
sethvalue(L, &registry->array[LUA_RIDX_GLOBALS - 1], luaH_new(L));
}
/*
** open parts of the state that may cause memory-allocation errors.
** ('g->nilvalue' being a nil value flags that the state was completely
** build.)
*/
static void f_luaopen (lua_State *L, void *ud) {
global_State *g = G(L);
@ -276,7 +237,7 @@ static void f_luaopen (lua_State *L, void *ud) {
luaT_init(L);
luaX_init(L);
g->gcrunning = 1; /* allow gc */
setnilvalue(&g->nilvalue);
setnilvalue(&g->nilvalue); /* now state is complete */
luai_userstateopen(L);
}
@ -290,8 +251,8 @@ static void preinit_thread (lua_State *L, global_State *g) {
L->stack = NULL;
L->ci = NULL;
L->nci = 0;
L->stacksize = 0;
L->twups = L; /* thread has no upvalues */
L->nCcalls = 0;
L->errorJmp = NULL;
L->hook = NULL;
L->hookmask = 0;
@ -301,15 +262,19 @@ static void preinit_thread (lua_State *L, global_State *g) {
L->openupval = NULL;
L->status = LUA_OK;
L->errfunc = 0;
L->oldpc = 0;
}
static void close_state (lua_State *L) {
global_State *g = G(L);
luaF_close(L, L->stack, CLOSEPROTECT); /* close all upvalues */
luaC_freeallobjects(L); /* collect all objects */
if (ttisnil(&g->nilvalue)) /* closing a fully built state? */
if (!completestate(g)) /* closing a partially built state? */
luaC_freeallobjects(L); /* jucst collect its objects */
else { /* closing a fully built state */
luaD_closeprotected(L, 1, LUA_OK); /* close all upvalues */
luaC_freeallobjects(L); /* collect all objects */
luai_userstateclose(L);
}
luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size);
freestack(L);
lua_assert(gettotalbytes(g) == sizeof(LG));
@ -318,9 +283,10 @@ static void close_state (lua_State *L) {
LUA_API lua_State *lua_newthread (lua_State *L) {
global_State *g = G(L);
global_State *g;
lua_State *L1;
lua_lock(L);
g = G(L);
luaC_checkGC(L);
/* create new thread */
L1 = &cast(LX *, luaM_newobject(L, LUA_TTHREAD, sizeof(LX)))->l;
@ -333,7 +299,6 @@ LUA_API lua_State *lua_newthread (lua_State *L) {
setthvalue2s(L, L->top, L1);
api_incr_top(L);
preinit_thread(L1, g);
L1->nCcalls = getCcalls(L);
L1->hookmask = L->hookmask;
L1->basehookcount = L->basehookcount;
L1->hook = L->hook;
@ -350,7 +315,7 @@ LUA_API lua_State *lua_newthread (lua_State *L) {
void luaE_freethread (lua_State *L, lua_State *L1) {
LX *l = fromstate(L1);
luaF_close(L1, L1->stack, NOCLOSINGMETH); /* close all upvalues */
luaF_closeupval(L1, L1->stack); /* close all upvalues */
lua_assert(L1->openupval == NULL);
luai_userstatefree(L, L1);
freestack(L1);
@ -358,23 +323,29 @@ void luaE_freethread (lua_State *L, lua_State *L1) {
}
int lua_resetthread (lua_State *L) {
CallInfo *ci;
int status;
lua_lock(L);
L->ci = ci = &L->base_ci; /* unwind CallInfo list */
int luaE_resetthread (lua_State *L, int status) {
CallInfo *ci = L->ci = &L->base_ci; /* unwind CallInfo list */
setnilvalue(s2v(L->stack)); /* 'function' entry for basic 'ci' */
ci->func = L->stack;
ci->callstatus = CIST_C;
status = luaF_close(L, L->stack, CLOSEPROTECT);
if (status != CLOSEPROTECT) /* real errors? */
luaD_seterrorobj(L, status, L->stack + 1);
else {
if (status == LUA_YIELD)
status = LUA_OK;
status = luaD_closeprotected(L, 1, status);
if (status != LUA_OK) /* errors? */
luaD_seterrorobj(L, status, L->stack + 1);
else
L->top = L->stack + 1;
}
ci->top = L->top + LUA_MINSTACK;
L->status = status;
L->status = cast_byte(status);
luaD_reallocstack(L, cast_int(ci->top - L->stack), 0);
return status;
}
LUA_API int lua_resetthread (lua_State *L) {
int status;
lua_lock(L);
status = luaE_resetthread(L, L->status);
lua_unlock(L);
return status;
}
@ -394,7 +365,7 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
preinit_thread(L, g);
g->allgc = obj2gco(L); /* by now, only object is the main thread */
L->next = NULL;
g->Cstacklimit = L->nCcalls = LUAI_MAXCSTACK + CSTACKERR;
incnny(L); /* main thread is always non yieldable */
g->frealloc = f;
g->ud = ud;
g->warnf = NULL;
@ -408,10 +379,11 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
g->panic = NULL;
g->gcstate = GCSpause;
g->gckind = KGC_INC;
g->gcstopem = 0;
g->gcemergency = 0;
g->finobj = g->tobefnz = g->fixedgc = NULL;
g->survival = g->old = g->reallyold = NULL;
g->finobjsur = g->finobjold = g->finobjrold = NULL;
g->firstold1 = g->survival = g->old1 = g->reallyold = NULL;
g->finobjsur = g->finobjold1 = g->finobjrold = NULL;
g->sweepgc = NULL;
g->gray = g->grayagain = NULL;
g->weak = g->ephemeron = g->allweak = NULL;
@ -436,8 +408,8 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
LUA_API void lua_close (lua_State *L) {
L = G(L)->mainthread; /* only the main thread can be closed */
lua_lock(L);
L = G(L)->mainthread; /* only the main thread can be closed */
close_state(L);
}

182
lua/src/lstate.h
View file

@ -32,13 +32,29 @@
**
** 'allgc' -> 'survival': new objects;
** 'survival' -> 'old': objects that survived one collection;
** 'old' -> 'reallyold': objects that became old in last collection;
** 'old1' -> 'reallyold': objects that became old in last collection;
** 'reallyold' -> NULL: objects old for more than one cycle.
**
** 'finobj' -> 'finobjsur': new objects marked for finalization;
** 'finobjsur' -> 'finobjold': survived """";
** 'finobjold' -> 'finobjrold': just old """";
** 'finobjsur' -> 'finobjold1': survived """";
** 'finobjold1' -> 'finobjrold': just old """";
** 'finobjrold' -> NULL: really old """".
**
** All lists can contain elements older than their main ages, due
** to 'luaC_checkfinalizer' and 'udata2finalize', which move
** objects between the normal lists and the "marked for finalization"
** lists. Moreover, barriers can age young objects in young lists as
** OLD0, which then become OLD1. However, a list never contains
** elements younger than their main ages.
**
** The generational collector also uses a pointer 'firstold1', which
** points to the first OLD1 object in the list. It is used to optimize
** 'markold'. (Potentially OLD1 objects can be anywhere between 'allgc'
** and 'reallyold', but often the list has no OLD1 objects or they are
** after 'old1'.) Note the difference between it and 'old1':
** 'firstold1': no OLD1 objects before this point; there can be all
** ages after it.
** 'old1': no objects younger than OLD1 after this point.
*/
/*
@ -47,7 +63,7 @@
** can become gray have such a field. The field is not the same
** in all objects, but it always has this name.) Any gray object
** must belong to one of these lists, and all objects in these lists
** must be gray:
** must be gray (with two exceptions explained below):
**
** 'gray': regular gray objects, still waiting to be visited.
** 'grayagain': objects that must be revisited at the atomic phase.
@ -58,54 +74,26 @@
** 'weak': tables with weak values to be cleared;
** 'ephemeron': ephemeron tables with white->white entries;
** 'allweak': tables with weak keys and/or weak values to be cleared.
**
** The exceptions to that "gray rule" are:
** - TOUCHED2 objects in generational mode stay in a gray list (because
** they must be visited again at the end of the cycle), but they are
** marked black because assignments to them must activate barriers (to
** move them back to TOUCHED1).
** - Open upvales are kept gray to avoid barriers, but they stay out
** of gray lists. (They don't even have a 'gclist' field.)
*/
/*
** About 'nCcalls': each thread in Lua (a lua_State) keeps a count of
** how many "C calls" it still can do in the C stack, to avoid C-stack
** overflow. This count is very rough approximation; it considers only
** recursive functions inside the interpreter, as non-recursive calls
** can be considered using a fixed (although unknown) amount of stack
** space.
**
** The count has two parts: the lower part is the count itself; the
** higher part counts the number of non-yieldable calls in the stack.
** (They are together so that we can change both with one instruction.)
**
** Because calls to external C functions can use an unknown amount
** of space (e.g., functions using an auxiliary buffer), calls
** to these functions add more than one to the count (see CSTACKCF).
**
** The proper count excludes the number of CallInfo structures allocated
** by Lua, as a kind of "potential" calls. So, when Lua calls a function
** (and "consumes" one CallInfo), it needs neither to decrement nor to
** check 'nCcalls', as its use of C stack is already accounted for.
** About 'nCcalls': This count has two parts: the lower 16 bits counts
** the number of recursive invocations in the C stack; the higher
** 16 bits counts the number of non-yieldable calls in the stack.
** (They are together so that we can change and save both with one
** instruction.)
*/
/* number of "C stack slots" used by an external C function */
#define CSTACKCF 10
/*
** The C-stack size is sliced in the following zones:
** - larger than CSTACKERR: normal stack;
** - [CSTACKMARK, CSTACKERR]: buffer zone to signal a stack overflow;
** - [CSTACKCF, CSTACKERRMARK]: error-handling zone;
** - below CSTACKERRMARK: buffer zone to signal overflow during overflow;
** (Because the counter can be decremented CSTACKCF at once, we need
** the so called "buffer zones", with at least that size, to properly
** detect a change from one zone to the next.)
*/
#define CSTACKERR (8 * CSTACKCF)
#define CSTACKMARK (CSTACKERR - (CSTACKCF + 2))
#define CSTACKERRMARK (CSTACKCF + 2)
/* initial limit for the C-stack of threads */
#define CSTACKTHREAD (2 * CSTACKERR)
/* true if this thread does not have non-yieldable calls in the stack */
#define yieldable(L) (((L)->nCcalls & 0xffff0000) == 0)
@ -120,13 +108,8 @@
/* Decrement the number of non-yieldable calls */
#define decnny(L) ((L)->nCcalls -= 0x10000)
/* Increment the number of non-yieldable calls and decrement nCcalls */
#define incXCcalls(L) ((L)->nCcalls += 0x10000 - CSTACKCF)
/* Decrement the number of non-yieldable calls and increment nCcalls */
#define decXCcalls(L) ((L)->nCcalls -= 0x10000 - CSTACKCF)
/* Non-yieldable call increment */
#define nyci (0x10000 | 1)
@ -144,12 +127,20 @@ struct lua_longjmp; /* defined in ldo.c */
#endif
/* extra stack space to handle TM calls and some other extras */
/*
** Extra stack space to handle TM calls and some other extras. This
** space is not included in 'stack_last'. It is used only to avoid stack
** checks, either because the element will be promptly popped or because
** there will be a stack check soon after the push. Function frames
** never use this extra space, so it does not need to be kept clean.
*/
#define EXTRA_STACK 5
#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
#define stacksize(th) cast_int((th)->stack_last - (th)->stack)
/* kinds of Garbage Collection */
#define KGC_INC 0 /* incremental gc */
@ -165,6 +156,18 @@ typedef struct stringtable {
/*
** Information about a call.
** About union 'u':
** - field 'l' is used only for Lua functions;
** - field 'c' is used only for C functions.
** About union 'u2':
** - field 'funcidx' is used only by C functions while doing a
** protected call;
** - field 'nyield' is used only while a function is "doing" an
** yield (from the yield until the next resume);
** - field 'nres' is used only while closing tbc variables when
** returning from a C function;
** - field 'transferinfo' is used only during call/returnhooks,
** before the function starts or after it ends.
*/
typedef struct CallInfo {
StkId func; /* function index in the stack */
@ -185,6 +188,7 @@ typedef struct CallInfo {
union {
int funcidx; /* called-function index */
int nyield; /* number of values yielded */
int nres; /* number of values returned */
struct { /* info about transferred values (for call/return hooks) */
unsigned short ftransfer; /* offset of first value transferred */
unsigned short ntransfer; /* number of values transferred */
@ -200,16 +204,34 @@ typedef struct CallInfo {
*/
#define CIST_OAH (1<<0) /* original value of 'allowhook' */
#define CIST_C (1<<1) /* call is running a C function */
#define CIST_HOOKED (1<<2) /* call is running a debug hook */
#define CIST_YPCALL (1<<3) /* call is a yieldable protected call */
#define CIST_TAIL (1<<4) /* call was tail called */
#define CIST_HOOKYIELD (1<<5) /* last hook called yielded */
#define CIST_FIN (1<<6) /* call is running a finalizer */
#define CIST_TRAN (1<<7) /* 'ci' has transfer information */
#define CIST_FRESH (1<<2) /* call is on a fresh "luaV_execute" frame */
#define CIST_HOOKED (1<<3) /* call is running a debug hook */
#define CIST_YPCALL (1<<4) /* doing a yieldable protected call */
#define CIST_TAIL (1<<5) /* call was tail called */
#define CIST_HOOKYIELD (1<<6) /* last hook called yielded */
#define CIST_FIN (1<<7) /* call is running a finalizer */
#define CIST_TRAN (1<<8) /* 'ci' has transfer information */
#define CIST_CLSRET (1<<9) /* function is closing tbc variables */
/* Bits 10-12 are used for CIST_RECST (see below) */
#define CIST_RECST 10
#if defined(LUA_COMPAT_LT_LE)
#define CIST_LEQ (1<<8) /* using __lt for __le */
#define CIST_LEQ (1<<13) /* using __lt for __le */
#endif
/*
** Field CIST_RECST stores the "recover status", used to keep the error
** status while closing to-be-closed variables in coroutines, so that
** Lua can correctly resume after an yield from a __close method called
** because of an error. (Three bits are enough for error status.)
*/
#define getcistrecst(ci) (((ci)->callstatus >> CIST_RECST) & 7)
#define setcistrecst(ci,st) \
check_exp(((st) & 7) == (st), /* status must fit in three bits */ \
((ci)->callstatus = ((ci)->callstatus & ~(7 << CIST_RECST)) \
| ((st) << CIST_RECST)))
/* active function is a Lua function */
#define isLua(ci) (!((ci)->callstatus & CIST_C))
@ -238,6 +260,7 @@ typedef struct global_State {
lu_byte currentwhite;
lu_byte gcstate; /* state of garbage collector */
lu_byte gckind; /* kind of GC running */
lu_byte gcstopem; /* stops emergency collections */
lu_byte genminormul; /* control for minor generational collections */
lu_byte genmajormul; /* control for major generational collections */
lu_byte gcrunning; /* true if GC is running */
@ -257,10 +280,11 @@ typedef struct global_State {
GCObject *fixedgc; /* list of objects not to be collected */
/* fields for generational collector */
GCObject *survival; /* start of objects that survived one GC cycle */
GCObject *old; /* start of old objects */
GCObject *reallyold; /* old objects with more than one cycle */
GCObject *old1; /* start of old1 objects */
GCObject *reallyold; /* objects more than one cycle old ("really old") */
GCObject *firstold1; /* first OLD1 object in the list (if any) */
GCObject *finobjsur; /* list of survival objects with finalizers */
GCObject *finobjold; /* list of old objects with finalizers */
GCObject *finobjold1; /* list of old1 objects with finalizers */
GCObject *finobjrold; /* list of really old objects with finalizers */
struct lua_State *twups; /* list of threads with open upvalues */
lua_CFunction panic; /* to be called in unprotected errors */
@ -271,7 +295,6 @@ typedef struct global_State {
TString *strcache[STRCACHE_N][STRCACHE_M]; /* cache for strings in API */
lua_WarnFunction warnf; /* warning function */
void *ud_warn; /* auxiliary data to 'warnf' */
unsigned int Cstacklimit; /* current limit for the C stack */
} global_State;
@ -286,18 +309,18 @@ struct lua_State {
StkId top; /* first free slot in the stack */
global_State *l_G;
CallInfo *ci; /* call info for current function */
const Instruction *oldpc; /* last pc traced */
StkId stack_last; /* last free slot in the stack */
StkId stack_last; /* end of stack (last element + 1) */
StkId stack; /* stack base */
UpVal *openupval; /* list of open upvalues in this stack */
StkId tbclist; /* list of to-be-closed variables */
GCObject *gclist;
struct lua_State *twups; /* list of threads with open upvalues */
struct lua_longjmp *errorJmp; /* current error recover point */
CallInfo base_ci; /* CallInfo for first level (C calling Lua) */
volatile lua_Hook hook;
ptrdiff_t errfunc; /* current error handling function (stack index) */
l_uint32 nCcalls; /* number of allowed nested C calls - 'nci' */
int stacksize;
l_uint32 nCcalls; /* number of nested (non-yieldable | C) calls */
int oldpc; /* last pc traced */
int basehookcount;
int hookcount;
volatile l_signalT hookmask;
@ -306,9 +329,21 @@ struct lua_State {
#define G(L) (L->l_G)
/*
** 'g->nilvalue' being a nil value flags that the state was completely
** build.
*/
#define completestate(g) ttisnil(&g->nilvalue)
/*
** Union of all collectable objects (only for conversions)
** ISO C99, 6.5.2.3 p.5:
** "if a union contains several structures that share a common initial
** sequence [...], and if the union object currently contains one
** of these structures, it is permitted to inspect the common initial
** part of any of them anywhere that a declaration of the complete type
** of the union is visible."
*/
union GCUnion {
GCObject gc; /* common header */
@ -322,6 +357,11 @@ union GCUnion {
};
/*
** ISO C99, 6.7.2.1 p.14:
** "A pointer to a union object, suitably converted, points to each of
** its members [...], and vice versa."
*/
#define cast_u(o) cast(union GCUnion *, (o))
/* macros to convert a GCObject into a specific value */
@ -353,12 +393,12 @@ LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
LUAI_FUNC CallInfo *luaE_extendCI (lua_State *L);
LUAI_FUNC void luaE_freeCI (lua_State *L);
LUAI_FUNC void luaE_shrinkCI (lua_State *L);
LUAI_FUNC void luaE_enterCcall (lua_State *L);
LUAI_FUNC void luaE_checkcstack (lua_State *L);
LUAI_FUNC void luaE_incCstack (lua_State *L);
LUAI_FUNC void luaE_warning (lua_State *L, const char *msg, int tocont);
LUAI_FUNC void luaE_warnerror (lua_State *L, const char *where);
LUAI_FUNC int luaE_resetthread (lua_State *L, int status);
#define luaE_exitCcall(L) ((L)->nCcalls++)
#endif

28
lua/src/lstring.c
View file

@ -22,16 +22,6 @@
#include "lstring.h"
/*
** Lua will use at most ~(2^LUAI_HASHLIMIT) bytes from a long string to
** compute its hash
*/
#if !defined(LUAI_HASHLIMIT)
#define LUAI_HASHLIMIT 5
#endif
/*
** Maximum size for string table.
*/
@ -50,10 +40,9 @@ int luaS_eqlngstr (TString *a, TString *b) {
}
unsigned int luaS_hash (const char *str, size_t l, unsigned int seed,
size_t step) {
unsigned int luaS_hash (const char *str, size_t l, unsigned int seed) {
unsigned int h = seed ^ cast_uint(l);
for (; l >= step; l -= step)
for (; l > 0; l--)
h ^= ((h<<5) + (h>>2) + cast_byte(str[l - 1]));
return h;
}
@ -63,8 +52,7 @@ unsigned int luaS_hashlongstr (TString *ts) {
lua_assert(ts->tt == LUA_VLNGSTR);
if (ts->extra == 0) { /* no hash? */
size_t len = ts->u.lnglen;
size_t step = (len >> LUAI_HASHLIMIT) + 1;
ts->hash = luaS_hash(getstr(ts), len, ts->hash, step);
ts->hash = luaS_hash(getstr(ts), len, ts->hash);
ts->extra = 1; /* now it has its hash */
}
return ts->hash;
@ -101,7 +89,7 @@ void luaS_resize (lua_State *L, int nsize) {
if (nsize < osize) /* shrinking table? */
tablerehash(tb->hash, osize, nsize); /* depopulate shrinking part */
newvect = luaM_reallocvector(L, tb->hash, osize, nsize, TString*);
if (unlikely(newvect == NULL)) { /* reallocation failed? */
if (l_unlikely(newvect == NULL)) { /* reallocation failed? */
if (nsize < osize) /* was it shrinking table? */
tablerehash(tb->hash, nsize, osize); /* restore to original size */
/* leave table as it was */
@ -184,7 +172,7 @@ void luaS_remove (lua_State *L, TString *ts) {
static void growstrtab (lua_State *L, stringtable *tb) {
if (unlikely(tb->nuse == MAX_INT)) { /* too many strings? */
if (l_unlikely(tb->nuse == MAX_INT)) { /* too many strings? */
luaC_fullgc(L, 1); /* try to free some... */
if (tb->nuse == MAX_INT) /* still too many? */
luaM_error(L); /* cannot even create a message... */
@ -201,7 +189,7 @@ static TString *internshrstr (lua_State *L, const char *str, size_t l) {
TString *ts;
global_State *g = G(L);
stringtable *tb = &g->strt;
unsigned int h = luaS_hash(str, l, g->seed, 1);
unsigned int h = luaS_hash(str, l, g->seed);
TString **list = &tb->hash[lmod(h, tb->size)];
lua_assert(str != NULL); /* otherwise 'memcmp'/'memcpy' are undefined */
for (ts = *list; ts != NULL; ts = ts->u.hnext) {
@ -235,7 +223,7 @@ TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
return internshrstr(L, str, l);
else {
TString *ts;
if (unlikely(l >= (MAX_SIZE - sizeof(TString))/sizeof(char)))
if (l_unlikely(l >= (MAX_SIZE - sizeof(TString))/sizeof(char)))
luaM_toobig(L);
ts = luaS_createlngstrobj(L, l);
memcpy(getstr(ts), str, l * sizeof(char));
@ -271,7 +259,7 @@ Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue) {
Udata *u;
int i;
GCObject *o;
if (unlikely(s > MAX_SIZE - udatamemoffset(nuvalue)))
if (l_unlikely(s > MAX_SIZE - udatamemoffset(nuvalue)))
luaM_toobig(L);
o = luaC_newobj(L, LUA_VUSERDATA, sizeudata(nuvalue, s));
u = gco2u(o);

3
lua/src/lstring.h
View file

@ -41,8 +41,7 @@
#define eqshrstr(a,b) check_exp((a)->tt == LUA_VSHRSTR, (a) == (b))
LUAI_FUNC unsigned int luaS_hash (const char *str, size_t l,
unsigned int seed, size_t step);
LUAI_FUNC unsigned int luaS_hash (const char *str, size_t l, unsigned int seed);
LUAI_FUNC unsigned int luaS_hashlongstr (TString *ts);
LUAI_FUNC int luaS_eqlngstr (TString *a, TString *b);
LUAI_FUNC void luaS_resize (lua_State *L, int newsize);

122
lua/src/lstrlib.c
View file

@ -152,8 +152,9 @@ static int str_rep (lua_State *L) {
const char *s = luaL_checklstring(L, 1, &l);
lua_Integer n = luaL_checkinteger(L, 2);
const char *sep = luaL_optlstring(L, 3, "", &lsep);
if (n <= 0) lua_pushliteral(L, "");
else if (l + lsep < l || l + lsep > MAXSIZE / n) /* may overflow? */
if (n <= 0)
lua_pushliteral(L, "");
else if (l_unlikely(l + lsep < l || l + lsep > MAXSIZE / n))
return luaL_error(L, "resulting string too large");
else {
size_t totallen = (size_t)n * l + (size_t)(n - 1) * lsep;
@ -181,7 +182,7 @@ static int str_byte (lua_State *L) {
size_t pose = getendpos(L, 3, pi, l);
int n, i;
if (posi > pose) return 0; /* empty interval; return no values */
if (pose - posi >= (size_t)INT_MAX) /* arithmetic overflow? */
if (l_unlikely(pose - posi >= (size_t)INT_MAX)) /* arithmetic overflow? */
return luaL_error(L, "string slice too long");
n = (int)(pose - posi) + 1;
luaL_checkstack(L, n, "string slice too long");
@ -235,7 +236,7 @@ static int str_dump (lua_State *L) {
luaL_checktype(L, 1, LUA_TFUNCTION);
lua_settop(L, 1); /* ensure function is on the top of the stack */
state.init = 0;
if (lua_dump(L, writer, &state, strip) != 0)
if (l_unlikely(lua_dump(L, writer, &state, strip) != 0))
return luaL_error(L, "unable to dump given function");
luaL_pushresult(&state.B);
return 1;
@ -275,7 +276,8 @@ static int tonum (lua_State *L, int arg) {
static void trymt (lua_State *L, const char *mtname) {
lua_settop(L, 2); /* back to the original arguments */
if (lua_type(L, 2) == LUA_TSTRING || !luaL_getmetafield(L, 2, mtname))
if (l_unlikely(lua_type(L, 2) == LUA_TSTRING ||
!luaL_getmetafield(L, 2, mtname)))
luaL_error(L, "attempt to %s a '%s' with a '%s'", mtname + 2,
luaL_typename(L, -2), luaL_typename(L, -1));
lua_insert(L, -3); /* put metamethod before arguments */
@ -383,7 +385,8 @@ static const char *match (MatchState *ms, const char *s, const char *p);
static int check_capture (MatchState *ms, int l) {
l -= '1';
if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
if (l_unlikely(l < 0 || l >= ms->level ||
ms->capture[l].len == CAP_UNFINISHED))
return luaL_error(ms->L, "invalid capture index %%%d", l + 1);
return l;
}
@ -400,14 +403,14 @@ static int capture_to_close (MatchState *ms) {
static const char *classend (MatchState *ms, const char *p) {
switch (*p++) {
case L_ESC: {
if (p == ms->p_end)
if (l_unlikely(p == ms->p_end))
luaL_error(ms->L, "malformed pattern (ends with '%%')");
return p+1;
}
case '[': {
if (*p == '^') p++;
do { /* look for a ']' */
if (p == ms->p_end)
if (l_unlikely(p == ms->p_end))
luaL_error(ms->L, "malformed pattern (missing ']')");
if (*(p++) == L_ESC && p < ms->p_end)
p++; /* skip escapes (e.g. '%]') */
@ -482,7 +485,7 @@ static int singlematch (MatchState *ms, const char *s, const char *p,
static const char *matchbalance (MatchState *ms, const char *s,
const char *p) {
if (p >= ms->p_end - 1)
if (l_unlikely(p >= ms->p_end - 1))
luaL_error(ms->L, "malformed pattern (missing arguments to '%%b')");
if (*s != *p) return NULL;
else {
@ -565,7 +568,7 @@ static const char *match_capture (MatchState *ms, const char *s, int l) {
static const char *match (MatchState *ms, const char *s, const char *p) {
if (ms->matchdepth-- == 0)
if (l_unlikely(ms->matchdepth-- == 0))
luaL_error(ms->L, "pattern too complex");
init: /* using goto's to optimize tail recursion */
if (p != ms->p_end) { /* end of pattern? */
@ -599,7 +602,7 @@ static const char *match (MatchState *ms, const char *s, const char *p) {
case 'f': { /* frontier? */
const char *ep; char previous;
p += 2;
if (*p != '[')
if (l_unlikely(*p != '['))
luaL_error(ms->L, "missing '[' after '%%f' in pattern");
ep = classend(ms, p); /* points to what is next */
previous = (s == ms->src_init) ? '\0' : *(s - 1);
@ -699,7 +702,7 @@ static const char *lmemfind (const char *s1, size_t l1,
static size_t get_onecapture (MatchState *ms, int i, const char *s,
const char *e, const char **cap) {
if (i >= ms->level) {
if (i != 0)
if (l_unlikely(i != 0))
luaL_error(ms->L, "invalid capture index %%%d", i + 1);
*cap = s;
return e - s;
@ -707,7 +710,7 @@ static size_t get_onecapture (MatchState *ms, int i, const char *s,
else {
ptrdiff_t capl = ms->capture[i].len;
*cap = ms->capture[i].init;
if (capl == CAP_UNFINISHED)
if (l_unlikely(capl == CAP_UNFINISHED))
luaL_error(ms->L, "unfinished capture");
else if (capl == CAP_POSITION)
lua_pushinteger(ms->L, (ms->capture[i].init - ms->src_init) + 1);
@ -926,7 +929,7 @@ static int add_value (MatchState *ms, luaL_Buffer *b, const char *s,
luaL_addlstring(b, s, e - s); /* keep original text */
return 0; /* no changes */
}
else if (!lua_isstring(L, -1))
else if (l_unlikely(!lua_isstring(L, -1)))
return luaL_error(L, "invalid replacement value (a %s)",
luaL_typename(L, -1));
else {
@ -1058,7 +1061,7 @@ static int lua_number2strx (lua_State *L, char *buff, int sz,
for (i = 0; i < n; i++)
buff[i] = toupper(uchar(buff[i]));
}
else if (fmt[SIZELENMOD] != 'a')
else if (l_unlikely(fmt[SIZELENMOD] != 'a'))
return luaL_error(L, "modifiers for format '%%a'/'%%A' not implemented");
return n;
}
@ -1358,17 +1361,6 @@ struct cD {
#define MAXALIGN (offsetof(struct cD, u))
/*
** Union for serializing floats
*/
typedef union Ftypes {
float f;
double d;
lua_Number n;
char buff[5 * sizeof(lua_Number)]; /* enough for any float type */
} Ftypes;
/*
** information to pack/unpack stuff
*/
@ -1385,7 +1377,9 @@ typedef struct Header {
typedef enum KOption {
Kint, /* signed integers */
Kuint, /* unsigned integers */
Kfloat, /* floating-point numbers */
Kfloat, /* single-precision floating-point numbers */
Knumber, /* Lua "native" floating-point numbers */
Kdouble, /* double-precision floating-point numbers */
Kchar, /* fixed-length strings */
Kstring, /* strings with prefixed length */
Kzstr, /* zero-terminated strings */
@ -1420,7 +1414,7 @@ static int getnum (const char **fmt, int df) {
*/
static int getnumlimit (Header *h, const char **fmt, int df) {
int sz = getnum(fmt, df);
if (sz > MAXINTSIZE || sz <= 0)
if (l_unlikely(sz > MAXINTSIZE || sz <= 0))
return luaL_error(h->L, "integral size (%d) out of limits [1,%d]",
sz, MAXINTSIZE);
return sz;
@ -1454,14 +1448,14 @@ static KOption getoption (Header *h, const char **fmt, int *size) {
case 'J': *size = sizeof(lua_Integer); return Kuint;
case 'T': *size = sizeof(size_t); return Kuint;
case 'f': *size = sizeof(float); return Kfloat;
case 'd': *size = sizeof(double); return Kfloat;
case 'n': *size = sizeof(lua_Number); return Kfloat;
case 'n': *size = sizeof(lua_Number); return Knumber;
case 'd': *size = sizeof(double); return Kdouble;
case 'i': *size = getnumlimit(h, fmt, sizeof(int)); return Kint;
case 'I': *size = getnumlimit(h, fmt, sizeof(int)); return Kuint;
case 's': *size = getnumlimit(h, fmt, sizeof(size_t)); return Kstring;
case 'c':
*size = getnum(fmt, -1);
if (*size == -1)
if (l_unlikely(*size == -1))
luaL_error(h->L, "missing size for format option 'c'");
return Kchar;
case 'z': return Kzstr;
@ -1500,7 +1494,7 @@ static KOption getdetails (Header *h, size_t totalsize,
else {
if (align > h->maxalign) /* enforce maximum alignment */
align = h->maxalign;
if ((align & (align - 1)) != 0) /* is 'align' not a power of 2? */
if (l_unlikely((align & (align - 1)) != 0)) /* not a power of 2? */
luaL_argerror(h->L, 1, "format asks for alignment not power of 2");
*ntoalign = (align - (int)(totalsize & (align - 1))) & (align - 1);
}
@ -1535,12 +1529,10 @@ static void packint (luaL_Buffer *b, lua_Unsigned n,
** Copy 'size' bytes from 'src' to 'dest', correcting endianness if
** given 'islittle' is different from native endianness.
*/
static void copywithendian (volatile char *dest, volatile const char *src,
static void copywithendian (char *dest, const char *src,
int size, int islittle) {
if (islittle == nativeendian.little) {
while (size-- != 0)
*(dest++) = *(src++);
}
if (islittle == nativeendian.little)
memcpy(dest, src, size);
else {
dest += size - 1;
while (size-- != 0)
@ -1583,15 +1575,27 @@ static int str_pack (lua_State *L) {
packint(&b, (lua_Unsigned)n, h.islittle, size, 0);
break;
}
case Kfloat: { /* floating-point options */
volatile Ftypes u;
char *buff = luaL_prepbuffsize(&b, size);
lua_Number n = luaL_checknumber(L, arg); /* get argument */
if (size == sizeof(u.f)) u.f = (float)n; /* copy it into 'u' */
else if (size == sizeof(u.d)) u.d = (double)n;
else u.n = n;
/* move 'u' to final result, correcting endianness if needed */
copywithendian(buff, u.buff, size, h.islittle);
case Kfloat: { /* C float */
float f = (float)luaL_checknumber(L, arg); /* get argument */
char *buff = luaL_prepbuffsize(&b, sizeof(f));
/* move 'f' to final result, correcting endianness if needed */
copywithendian(buff, (char *)&f, sizeof(f), h.islittle);
luaL_addsize(&b, size);
break;
}
case Knumber: { /* Lua float */
lua_Number f = luaL_checknumber(L, arg); /* get argument */
char *buff = luaL_prepbuffsize(&b, sizeof(f));
/* move 'f' to final result, correcting endianness if needed */
copywithendian(buff, (char *)&f, sizeof(f), h.islittle);
luaL_addsize(&b, size);
break;
}
case Kdouble: { /* C double */
double f = (double)luaL_checknumber(L, arg); /* get argument */
char *buff = luaL_prepbuffsize(&b, sizeof(f));
/* move 'f' to final result, correcting endianness if needed */
copywithendian(buff, (char *)&f, sizeof(f), h.islittle);
luaL_addsize(&b, size);
break;
}
@ -1682,7 +1686,7 @@ static lua_Integer unpackint (lua_State *L, const char *str,
else if (size > SZINT) { /* must check unread bytes */
int mask = (!issigned || (lua_Integer)res >= 0) ? 0 : MC;
for (i = limit; i < size; i++) {
if ((unsigned char)str[islittle ? i : size - 1 - i] != mask)
if (l_unlikely((unsigned char)str[islittle ? i : size - 1 - i] != mask))
luaL_error(L, "%d-byte integer does not fit into Lua Integer", size);
}
}
@ -1717,13 +1721,21 @@ static int str_unpack (lua_State *L) {
break;
}
case Kfloat: {
volatile Ftypes u;
lua_Number num;
copywithendian(u.buff, data + pos, size, h.islittle);
if (size == sizeof(u.f)) num = (lua_Number)u.f;
else if (size == sizeof(u.d)) num = (lua_Number)u.d;
else num = u.n;
lua_pushnumber(L, num);
float f;
copywithendian((char *)&f, data + pos, sizeof(f), h.islittle);
lua_pushnumber(L, (lua_Number)f);
break;
}
case Knumber: {
lua_Number f;
copywithendian((char *)&f, data + pos, sizeof(f), h.islittle);
lua_pushnumber(L, f);
break;
}
case Kdouble: {
double f;
copywithendian((char *)&f, data + pos, sizeof(f), h.islittle);
lua_pushnumber(L, (lua_Number)f);
break;
}
case Kchar: {
@ -1738,7 +1750,7 @@ static int str_unpack (lua_State *L) {
break;
}
case Kzstr: {
size_t len = (int)strlen(data + pos);
size_t len = strlen(data + pos);
luaL_argcheck(L, pos + len < ld, 2,
"unfinished string for format 'z'");
lua_pushlstring(L, data + pos, len);

159
lua/src/ltable.c
View file

@ -68,20 +68,25 @@
#define MAXHSIZE luaM_limitN(1u << MAXHBITS, Node)
/*
** When the original hash value is good, hashing by a power of 2
** avoids the cost of '%'.
*/
#define hashpow2(t,n) (gnode(t, lmod((n), sizenode(t))))
/*
** for other types, it is better to avoid modulo by power of 2, as
** they can have many 2 factors.
*/
#define hashmod(t,n) (gnode(t, ((n) % ((sizenode(t)-1)|1))))
#define hashstr(t,str) hashpow2(t, (str)->hash)
#define hashboolean(t,p) hashpow2(t, p)
#define hashint(t,i) hashpow2(t, i)
/*
** for some types, it is better to avoid modulus by power of 2, as
** they tend to have many 2 factors.
*/
#define hashmod(t,n) (gnode(t, ((n) % ((sizenode(t)-1)|1))))
#define hashpointer(t,p) hashmod(t, point2uint(p))
@ -135,24 +140,38 @@ static int l_hashfloat (lua_Number n) {
*/
static Node *mainposition (const Table *t, int ktt, const Value *kvl) {
switch (withvariant(ktt)) {
case LUA_VNUMINT:
return hashint(t, ivalueraw(*kvl));
case LUA_VNUMFLT:
return hashmod(t, l_hashfloat(fltvalueraw(*kvl)));
case LUA_VSHRSTR:
return hashstr(t, tsvalueraw(*kvl));
case LUA_VLNGSTR:
return hashpow2(t, luaS_hashlongstr(tsvalueraw(*kvl)));
case LUA_VNUMINT: {
lua_Integer key = ivalueraw(*kvl);
return hashint(t, key);
}
case LUA_VNUMFLT: {
lua_Number n = fltvalueraw(*kvl);
return hashmod(t, l_hashfloat(n));
}
case LUA_VSHRSTR: {
TString *ts = tsvalueraw(*kvl);
return hashstr(t, ts);
}
case LUA_VLNGSTR: {
TString *ts = tsvalueraw(*kvl);
return hashpow2(t, luaS_hashlongstr(ts));
}
case LUA_VFALSE:
return hashboolean(t, 0);
case LUA_VTRUE:
return hashboolean(t, 1);
case LUA_VLIGHTUSERDATA:
return hashpointer(t, pvalueraw(*kvl));
case LUA_VLCF:
return hashpointer(t, fvalueraw(*kvl));
default:
return hashpointer(t, gcvalueraw(*kvl));
case LUA_VLIGHTUSERDATA: {
void *p = pvalueraw(*kvl);
return hashpointer(t, p);
}
case LUA_VLCF: {
lua_CFunction f = fvalueraw(*kvl);
return hashpointer(t, f);
}
default: {
GCObject *o = gcvalueraw(*kvl);
return hashpointer(t, o);
}
}
}
@ -166,17 +185,30 @@ static Node *mainpositionTV (const Table *t, const TValue *key) {
/*
** Check whether key 'k1' is equal to the key in node 'n2'.
** This equality is raw, so there are no metamethods. Floats
** with integer values have been normalized, so integers cannot
** be equal to floats. It is assumed that 'eqshrstr' is simply
** pointer equality, so that short strings are handled in the
** default case.
** Check whether key 'k1' is equal to the key in node 'n2'. This
** equality is raw, so there are no metamethods. Floats with integer
** values have been normalized, so integers cannot be equal to
** floats. It is assumed that 'eqshrstr' is simply pointer equality, so
** that short strings are handled in the default case.
** A true 'deadok' means to accept dead keys as equal to their original
** values. All dead keys are compared in the default case, by pointer
** identity. (Only collectable objects can produce dead keys.) Note that
** dead long strings are also compared by identity.
** Once a key is dead, its corresponding value may be collected, and
** then another value can be created with the same address. If this
** other value is given to 'next', 'equalkey' will signal a false
** positive. In a regular traversal, this situation should never happen,
** as all keys given to 'next' came from the table itself, and therefore
** could not have been collected. Outside a regular traversal, we
** have garbage in, garbage out. What is relevant is that this false
** positive does not break anything. (In particular, 'next' will return
** some other valid item on the table or nil.)
*/
static int equalkey (const TValue *k1, const Node *n2) {
if (rawtt(k1) != keytt(n2)) /* not the same variants? */
static int equalkey (const TValue *k1, const Node *n2, int deadok) {
if ((rawtt(k1) != keytt(n2)) && /* not the same variants? */
!(deadok && keyisdead(n2) && iscollectable(k1)))
return 0; /* cannot be same key */
switch (ttypetag(k1)) {
switch (keytt(n2)) {
case LUA_VNIL: case LUA_VFALSE: case LUA_VTRUE:
return 1;
case LUA_VNUMINT:
@ -187,7 +219,7 @@ static int equalkey (const TValue *k1, const Node *n2) {
return pvalue(k1) == pvalueraw(keyval(n2));
case LUA_VLCF:
return fvalue(k1) == fvalueraw(keyval(n2));
case LUA_VLNGSTR:
case ctb(LUA_VLNGSTR):
return luaS_eqlngstr(tsvalue(k1), keystrval(n2));
default:
return gcvalue(k1) == gcvalueraw(keyval(n2));
@ -251,11 +283,12 @@ static unsigned int setlimittosize (Table *t) {
/*
** "Generic" get version. (Not that generic: not valid for integers,
** which may be in array part, nor for floats with integral values.)
** See explanation about 'deadok' in function 'equalkey'.
*/
static const TValue *getgeneric (Table *t, const TValue *key) {
static const TValue *getgeneric (Table *t, const TValue *key, int deadok) {
Node *n = mainpositionTV(t, key);
for (;;) { /* check whether 'key' is somewhere in the chain */
if (equalkey(key, n))
if (equalkey(key, n, deadok))
return gval(n); /* that's it */
else {
int nx = gnext(n);
@ -292,8 +325,8 @@ static unsigned int findindex (lua_State *L, Table *t, TValue *key,
if (i - 1u < asize) /* is 'key' inside array part? */
return i; /* yes; that's the index */
else {
const TValue *n = getgeneric(t, key);
if (unlikely(isabstkey(n)))
const TValue *n = getgeneric(t, key, 1);
if (l_unlikely(isabstkey(n)))
luaG_runerror(L, "invalid key to 'next'"); /* key not found */
i = cast_int(nodefromval(n) - gnode(t, 0)); /* key index in hash table */
/* hash elements are numbered after array ones */
@ -471,7 +504,7 @@ static void reinsert (lua_State *L, Table *ot, Table *t) {
already present in the table */
TValue k;
getnodekey(L, &k, old);
setobjt2t(L, luaH_set(L, t, &k), gval(old));
luaH_set(L, t, &k, gval(old));
}
}
}
@ -527,7 +560,7 @@ void luaH_resize (lua_State *L, Table *t, unsigned int newasize,
}
/* allocate new array */
newarray = luaM_reallocvector(L, t->array, oldasize, newasize, TValue);
if (unlikely(newarray == NULL && newasize > 0)) { /* allocation failed? */
if (l_unlikely(newarray == NULL && newasize > 0)) { /* allocation failed? */
freehash(L, &newt); /* release new hash part */
luaM_error(L); /* raise error (with array unchanged) */
}
@ -583,7 +616,7 @@ Table *luaH_new (lua_State *L) {
GCObject *o = luaC_newobj(L, LUA_VTABLE, sizeof(Table));
Table *t = gco2t(o);
t->metatable = NULL;
t->flags = cast_byte(~0);
t->flags = cast_byte(maskflags); /* table has no metamethod fields */
t->array = NULL;
t->alimit = 0;
setnodevector(L, t, 0);
@ -618,10 +651,10 @@ static Node *getfreepos (Table *t) {
** put new key in its main position; otherwise (colliding node is in its main
** position), new key goes to an empty position.
*/
TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {
void luaH_newkey (lua_State *L, Table *t, const TValue *key, TValue *value) {
Node *mp;
TValue aux;
if (unlikely(ttisnil(key)))
if (l_unlikely(ttisnil(key)))
luaG_runerror(L, "table index is nil");
else if (ttisfloat(key)) {
lua_Number f = fltvalue(key);
@ -630,9 +663,11 @@ TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {
setivalue(&aux, k);
key = &aux; /* insert it as an integer */
}
else if (unlikely(luai_numisnan(f)))
else if (l_unlikely(luai_numisnan(f)))
luaG_runerror(L, "table index is NaN");
}
if (ttisnil(value))
return; /* do not insert nil values */
mp = mainpositionTV(t, key);
if (!isempty(gval(mp)) || isdummy(t)) { /* main position is taken? */
Node *othern;
@ -640,7 +675,8 @@ TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {
if (f == NULL) { /* cannot find a free place? */
rehash(L, t, key); /* grow table */
/* whatever called 'newkey' takes care of TM cache */
return luaH_set(L, t, key); /* insert key into grown table */
luaH_set(L, t, key, value); /* insert key into grown table */
return;
}
lua_assert(!isdummy(t));
othern = mainposition(t, keytt(mp), &keyval(mp));
@ -668,7 +704,7 @@ TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key) {
setnodekey(L, mp, key);
luaC_barrierback(L, obj2gco(t), key);
lua_assert(isempty(gval(mp)));
return gval(mp);
setobj2t(L, gval(mp), value);
}
@ -730,7 +766,7 @@ const TValue *luaH_getstr (Table *t, TString *key) {
else { /* for long strings, use generic case */
TValue ko;
setsvalue(cast(lua_State *, NULL), &ko, key);
return getgeneric(t, &ko);
return getgeneric(t, &ko, 0);
}
}
@ -750,34 +786,45 @@ const TValue *luaH_get (Table *t, const TValue *key) {
/* else... */
} /* FALLTHROUGH */
default:
return getgeneric(t, key);
return getgeneric(t, key, 0);
}
}
/*
** Finish a raw "set table" operation, where 'slot' is where the value
** should have been (the result of a previous "get table").
** Beware: when using this function you probably need to check a GC
** barrier and invalidate the TM cache.
*/
void luaH_finishset (lua_State *L, Table *t, const TValue *key,
const TValue *slot, TValue *value) {
if (isabstkey(slot))
luaH_newkey(L, t, key, value);
else
setobj2t(L, cast(TValue *, slot), value);
}
/*
** beware: when using this function you probably need to check a GC
** barrier and invalidate the TM cache.
*/
TValue *luaH_set (lua_State *L, Table *t, const TValue *key) {
const TValue *p = luaH_get(t, key);
if (!isabstkey(p))
return cast(TValue *, p);
else return luaH_newkey(L, t, key);
void luaH_set (lua_State *L, Table *t, const TValue *key, TValue *value) {
const TValue *slot = luaH_get(t, key);
luaH_finishset(L, t, key, slot, value);
}
void luaH_setint (lua_State *L, Table *t, lua_Integer key, TValue *value) {
const TValue *p = luaH_getint(t, key);
TValue *cell;
if (!isabstkey(p))
cell = cast(TValue *, p);
else {
if (isabstkey(p)) {
TValue k;
setivalue(&k, key);
cell = luaH_newkey(L, t, &k);
luaH_newkey(L, t, &k, value);
}
setobj2t(L, cell, value);
else
setobj2t(L, cast(TValue *, p), value);
}

15
lua/src/ltable.h
View file

@ -15,7 +15,12 @@
#define gnext(n) ((n)->u.next)
#define invalidateTMcache(t) ((t)->flags = 0)
/*
** Clear all bits of fast-access metamethods, which means that the table
** may have any of these metamethods. (First access that fails after the
** clearing will set the bit again.)
*/
#define invalidateTMcache(t) ((t)->flags &= ~maskflags)
/* true when 't' is using 'dummynode' as its hash part */
@ -36,8 +41,12 @@ LUAI_FUNC void luaH_setint (lua_State *L, Table *t, lua_Integer key,
LUAI_FUNC const TValue *luaH_getshortstr (Table *t, TString *key);
LUAI_FUNC const TValue *luaH_getstr (Table *t, TString *key);
LUAI_FUNC const TValue *luaH_get (Table *t, const TValue *key);
LUAI_FUNC TValue *luaH_newkey (lua_State *L, Table *t, const TValue *key);
LUAI_FUNC TValue *luaH_set (lua_State *L, Table *t, const TValue *key);
LUAI_FUNC void luaH_newkey (lua_State *L, Table *t, const TValue *key,
TValue *value);
LUAI_FUNC void luaH_set (lua_State *L, Table *t, const TValue *key,
TValue *value);
LUAI_FUNC void luaH_finishset (lua_State *L, Table *t, const TValue *key,
const TValue *slot, TValue *value);
LUAI_FUNC Table *luaH_new (lua_State *L);
LUAI_FUNC void luaH_resize (lua_State *L, Table *t, unsigned int nasize,
unsigned int nhsize);

11
lua/src/ltablib.c
View file

@ -145,8 +145,8 @@ static int tmove (lua_State *L) {
static void addfield (lua_State *L, luaL_Buffer *b, lua_Integer i) {
lua_geti(L, 1, i);
if (!lua_isstring(L, -1))
luaL_error(L, "invalid value (%s) at index %d in table for 'concat'",
if (l_unlikely(!lua_isstring(L, -1)))
luaL_error(L, "invalid value (%s) at index %I in table for 'concat'",
luaL_typename(L, -1), i);
luaL_addvalue(b);
}
@ -196,7 +196,8 @@ static int tunpack (lua_State *L) {
lua_Integer e = luaL_opt(L, luaL_checkinteger, 3, luaL_len(L, 1));
if (i > e) return 0; /* empty range */
n = (lua_Unsigned)e - i; /* number of elements minus 1 (avoid overflows) */
if (n >= (unsigned int)INT_MAX || !lua_checkstack(L, (int)(++n)))
if (l_unlikely(n >= (unsigned int)INT_MAX ||
!lua_checkstack(L, (int)(++n))))
return luaL_error(L, "too many results to unpack");
for (; i < e; i++) { /* push arg[i..e - 1] (to avoid overflows) */
lua_geti(L, 1, i);
@ -300,14 +301,14 @@ static IdxT partition (lua_State *L, IdxT lo, IdxT up) {
for (;;) {
/* next loop: repeat ++i while a[i] < P */
while ((void)lua_geti(L, 1, ++i), sort_comp(L, -1, -2)) {
if (i == up - 1) /* a[i] < P but a[up - 1] == P ?? */
if (l_unlikely(i == up - 1)) /* a[i] < P but a[up - 1] == P ?? */
luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[i] */
}
/* after the loop, a[i] >= P and a[lo .. i - 1] < P */
/* next loop: repeat --j while P < a[j] */
while ((void)lua_geti(L, 1, --j), sort_comp(L, -3, -1)) {
if (j < i) /* j < i but a[j] > P ?? */
if (l_unlikely(j < i)) /* j < i but a[j] > P ?? */
luaL_error(L, "invalid order function for sorting");
lua_pop(L, 1); /* remove a[j] */
}

9
lua/src/ltm.c
View file

@ -147,7 +147,7 @@ static int callbinTM (lua_State *L, const TValue *p1, const TValue *p2,
void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
StkId res, TMS event) {
if (!callbinTM(L, p1, p2, res, event)) {
if (l_unlikely(!callbinTM(L, p1, p2, res, event))) {
switch (event) {
case TM_BAND: case TM_BOR: case TM_BXOR:
case TM_SHL: case TM_SHR: case TM_BNOT: {
@ -166,7 +166,8 @@ void luaT_trybinTM (lua_State *L, const TValue *p1, const TValue *p2,
void luaT_tryconcatTM (lua_State *L) {
StkId top = L->top;
if (!callbinTM(L, s2v(top - 2), s2v(top - 1), top - 2, TM_CONCAT))
if (l_unlikely(!callbinTM(L, s2v(top - 2), s2v(top - 1), top - 2,
TM_CONCAT)))
luaG_concaterror(L, s2v(top - 2), s2v(top - 1));
}
@ -240,7 +241,7 @@ void luaT_adjustvarargs (lua_State *L, int nfixparams, CallInfo *ci,
int actual = cast_int(L->top - ci->func) - 1; /* number of arguments */
int nextra = actual - nfixparams; /* number of extra arguments */
ci->u.l.nextraargs = nextra;
checkstackGC(L, p->maxstacksize + 1);
luaD_checkstack(L, p->maxstacksize + 1);
/* copy function to the top of the stack */
setobjs2s(L, L->top++, ci->func);
/* move fixed parameters to the top of the stack */
@ -259,7 +260,7 @@ void luaT_getvarargs (lua_State *L, CallInfo *ci, StkId where, int wanted) {
int nextra = ci->u.l.nextraargs;
if (wanted < 0) {
wanted = nextra; /* get all extra arguments available */
checkstackp(L, nextra, where); /* ensure stack space */
checkstackGCp(L, nextra, where); /* ensure stack space */
L->top = where + nextra; /* next instruction will need top */
}
for (i = 0; i < wanted && i < nextra; i++)

9
lua/src/ltm.h
View file

@ -45,6 +45,15 @@ typedef enum {
} TMS;
/*
** Mask with 1 in all fast-access methods. A 1 in any of these bits
** in the flag of a (meta)table means the metatable does not have the
** corresponding metamethod field. (Bit 7 of the flag is used for
** 'isrealasize'.)
*/
#define maskflags (~(~0u << (TM_EQ + 1)))
/*
** Test whether there is no tagmethod.
** (Because tagmethods use raw accesses, the result may be an "empty" nil.)

42
lua/src/lua.c
View file

@ -37,6 +37,26 @@ static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
#if defined(LUA_USE_POSIX) /* { */
/*
** Use 'sigaction' when available.
*/
static void setsignal (int sig, void (*handler)(int)) {
struct sigaction sa;
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask); /* do not mask any signal */
sigaction(sig, &sa, NULL);
}
#else /* }{ */
#define setsignal signal
#endif /* } */
/*
** Hook set by signal function to stop the interpreter.
*/
@ -55,7 +75,7 @@ static void lstop (lua_State *L, lua_Debug *ar) {
*/
static void laction (int i) {
int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT;
signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
setsignal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
lua_sethook(globalL, lstop, flag, 1);
}
@ -135,9 +155,9 @@ static int docall (lua_State *L, int narg, int nres) {
lua_pushcfunction(L, msghandler); /* push message handler */
lua_insert(L, base); /* put it under function and args */
globalL = L; /* to be available to 'laction' */
signal(SIGINT, laction); /* set C-signal handler */
setsignal(SIGINT, laction); /* set C-signal handler */
status = lua_pcall(L, narg, nres, base);
signal(SIGINT, SIG_DFL); /* reset C-signal handler */
setsignal(SIGINT, SIG_DFL); /* reset C-signal handler */
lua_remove(L, base); /* remove message handler from the stack */
return status;
}
@ -416,14 +436,18 @@ static int handle_luainit (lua_State *L) {
/*
** Returns the string to be used as a prompt by the interpreter.
** Return the string to be used as a prompt by the interpreter. Leave
** the string (or nil, if using the default value) on the stack, to keep
** it anchored.
*/
static const char *get_prompt (lua_State *L, int firstline) {
const char *p;
lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
p = lua_tostring(L, -1);
if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
return p;
if (lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2") == LUA_TNIL)
return (firstline ? LUA_PROMPT : LUA_PROMPT2); /* use the default */
else { /* apply 'tostring' over the value */
const char *p = luaL_tolstring(L, -1, NULL);
lua_remove(L, -2); /* remove original value */
return p;
}
}
/* mark in error messages for incomplete statements */

9
lua/src/lua.h
View file

@ -18,14 +18,14 @@
#define LUA_VERSION_MAJOR "5"
#define LUA_VERSION_MINOR "4"
#define LUA_VERSION_RELEASE "0"
#define LUA_VERSION_RELEASE "3"
#define LUA_VERSION_NUM 504
#define LUA_VERSION_RELEASE_NUM (LUA_VERSION_NUM * 100 + 0)
#define LUA_VERSION "Lua " LUA_VERSION_MAJOR "." LUA_VERSION_MINOR
#define LUA_RELEASE LUA_VERSION "." LUA_VERSION_RELEASE
#define LUA_COPYRIGHT LUA_RELEASE " Copyright (C) 1994-2020 Lua.org, PUC-Rio"
#define LUA_COPYRIGHT LUA_RELEASE " Copyright (C) 1994-2021 Lua.org, PUC-Rio"
#define LUA_AUTHORS "R. Ierusalimschy, L. H. de Figueiredo, W. Celes"
@ -347,7 +347,8 @@ LUA_API size_t (lua_stringtonumber) (lua_State *L, const char *s);
LUA_API lua_Alloc (lua_getallocf) (lua_State *L, void **ud);
LUA_API void (lua_setallocf) (lua_State *L, lua_Alloc f, void *ud);
LUA_API void (lua_toclose) (lua_State *L, int idx);
LUA_API void (lua_toclose) (lua_State *L, int idx);
LUA_API void (lua_closeslot) (lua_State *L, int idx);
/*
@ -491,7 +492,7 @@ struct lua_Debug {
/******************************************************************************
* Copyright (C) 1994-2020 Lua.org, PUC-Rio.
* Copyright (C) 1994-2021 Lua.org, PUC-Rio.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the

128
lua/src/luaconf.h
View file

@ -16,13 +16,13 @@
** ===================================================================
** General Configuration File for Lua
**
** Some definitions here can be changed externally, through the
** compiler (e.g., with '-D' options). Those are protected by
** '#if !defined' guards. However, several other definitions should
** be changed directly here, either because they affect the Lua
** ABI (by making the changes here, you ensure that all software
** connected to Lua, such as C libraries, will be compiled with the
** same configuration); or because they are seldom changed.
** Some definitions here can be changed externally, through the compiler
** (e.g., with '-D' options): They are commented out or protected
** by '#if !defined' guards. However, several other definitions
** should be changed directly here, either because they affect the
** Lua ABI (by making the changes here, you ensure that all software
** connected to Lua, such as C libraries, will be compiled with the same
** configuration); or because they are seldom changed.
**
** Search for "@@" to find all configurable definitions.
** ===================================================================
@ -36,21 +36,6 @@
** =====================================================================
*/
/*
@@ LUAI_MAXCSTACK defines the maximum depth for nested calls and
** also limits the maximum depth of other recursive algorithms in
** the implementation, such as syntactic analysis. A value too
** large may allow the interpreter to crash (C-stack overflow).
** The default value seems ok for regular machines, but may be
** too high for restricted hardware.
** The test file 'cstack.lua' may help finding a good limit.
** (It will crash with a limit too high.)
*/
#if !defined(LUAI_MAXCSTACK)
#define LUAI_MAXCSTACK 2000
#endif
/*
@@ LUA_USE_C89 controls the use of non-ISO-C89 features.
** Define it if you want Lua to avoid the use of a few C99 features
@ -96,26 +81,12 @@
/*
** {==================================================================
** Configuration for Number types.
** Configuration for Number types. These options should not be
** set externally, because any other code connected to Lua must
** use the same configuration.
** ===================================================================
*/
/*
@@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats.
*/
/* #define LUA_32BITS */
/*
@@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for
** C89 ('long' and 'double'); Windows always has '__int64', so it does
** not need to use this case.
*/
#if defined(LUA_USE_C89) && !defined(LUA_USE_WINDOWS)
#define LUA_C89_NUMBERS
#endif
/*
@@ LUA_INT_TYPE defines the type for Lua integers.
@@ LUA_FLOAT_TYPE defines the type for Lua floats.
@ -136,7 +107,31 @@
#define LUA_FLOAT_DOUBLE 2
#define LUA_FLOAT_LONGDOUBLE 3
#if defined(LUA_32BITS) /* { */
/* Default configuration ('long long' and 'double', for 64-bit Lua) */
#define LUA_INT_DEFAULT LUA_INT_LONGLONG
#define LUA_FLOAT_DEFAULT LUA_FLOAT_DOUBLE
/*
@@ LUA_32BITS enables Lua with 32-bit integers and 32-bit floats.
*/
#define LUA_32BITS 0
/*
@@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for
** C89 ('long' and 'double'); Windows always has '__int64', so it does
** not need to use this case.
*/
#if defined(LUA_USE_C89) && !defined(LUA_USE_WINDOWS)
#define LUA_C89_NUMBERS 1
#else
#define LUA_C89_NUMBERS 0
#endif
#if LUA_32BITS /* { */
/*
** 32-bit integers and 'float'
*/
@ -147,27 +142,22 @@
#endif
#define LUA_FLOAT_TYPE LUA_FLOAT_FLOAT
#elif defined(LUA_C89_NUMBERS) /* }{ */
#elif LUA_C89_NUMBERS /* }{ */
/*
** largest types available for C89 ('long' and 'double')
*/
#define LUA_INT_TYPE LUA_INT_LONG
#define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
#else /* }{ */
/* use defaults */
#define LUA_INT_TYPE LUA_INT_DEFAULT
#define LUA_FLOAT_TYPE LUA_FLOAT_DEFAULT
#endif /* } */
/*
** default configuration for 64-bit Lua ('long long' and 'double')
*/
#if !defined(LUA_INT_TYPE)
#define LUA_INT_TYPE LUA_INT_LONGLONG
#endif
#if !defined(LUA_FLOAT_TYPE)
#define LUA_FLOAT_TYPE LUA_FLOAT_DOUBLE
#endif
/* }================================================================== */
@ -388,14 +378,13 @@
/*
** {==================================================================
** Configuration for Numbers.
** Configuration for Numbers (low-level part).
** Change these definitions if no predefined LUA_FLOAT_* / LUA_INT_*
** satisfy your needs.
** ===================================================================
*/
/*
@@ LUA_NUMBER is the floating-point type used by Lua.
@@ LUAI_UACNUMBER is the result of a 'default argument promotion'
@@ over a floating number.
@@ l_floatatt(x) corrects float attribute 'x' to the proper float type
@ -488,10 +477,7 @@
/*
@@ LUA_INTEGER is the integer type used by Lua.
**
@@ LUA_UNSIGNED is the unsigned version of LUA_INTEGER.
**
@@ LUAI_UACINT is the result of a 'default argument promotion'
@@ over a LUA_INTEGER.
@@ LUA_INTEGER_FRMLEN is the length modifier for reading/writing integers.
@ -674,6 +660,34 @@
#define lua_getlocaledecpoint() (localeconv()->decimal_point[0])
#endif
/*
** macros to improve jump prediction, used mostly for error handling
** and debug facilities. (Some macros in the Lua API use these macros.
** Define LUA_NOBUILTIN if you do not want '__builtin_expect' in your
** code.)
*/
#if !defined(luai_likely)
#if defined(__GNUC__) && !defined(LUA_NOBUILTIN)
#define luai_likely(x) (__builtin_expect(((x) != 0), 1))
#define luai_unlikely(x) (__builtin_expect(((x) != 0), 0))
#else
#define luai_likely(x) (x)
#define luai_unlikely(x) (x)
#endif
#endif
#if defined(LUA_CORE) || defined(LUA_LIB)
/* shorter names for Lua's own use */
#define l_likely(x) luai_likely(x)
#define l_unlikely(x) luai_unlikely(x)
#endif
/* }================================================================== */

6
lua/src/lualib.h
View file

@ -49,10 +49,4 @@ LUAMOD_API int (luaopen_package) (lua_State *L);
LUALIB_API void (luaL_openlibs) (lua_State *L);
#if !defined(lua_assert)
#define lua_assert(x) ((void)0)
#endif
#endif

12
lua/src/lundump.c
View file

@ -120,7 +120,10 @@ static TString *loadStringN (LoadState *S, Proto *p) {
}
else { /* long string */
ts = luaS_createlngstrobj(L, size); /* create string */
setsvalue2s(L, L->top, ts); /* anchor it ('loadVector' can GC) */
luaD_inctop(L);
loadVector(S, getstr(ts), size); /* load directly in final place */
L->top--; /* pop string */
}
luaC_objbarrier(L, p, ts);
return ts;
@ -200,13 +203,20 @@ static void loadProtos (LoadState *S, Proto *f) {
}
/*
** Load the upvalues for a function. The names must be filled first,
** because the filling of the other fields can raise read errors and
** the creation of the error message can call an emergency collection;
** in that case all prototypes must be consistent for the GC.
*/
static void loadUpvalues (LoadState *S, Proto *f) {
int i, n;
n = loadInt(S);
f->upvalues = luaM_newvectorchecked(S->L, n, Upvaldesc);
f->sizeupvalues = n;
for (i = 0; i < n; i++) {
for (i = 0; i < n; i++) /* make array valid for GC */
f->upvalues[i].name = NULL;
for (i = 0; i < n; i++) { /* following calls can raise errors */
f->upvalues[i].instack = loadByte(S);
f->upvalues[i].idx = loadByte(S);
f->upvalues[i].kind = loadByte(S);

168
lua/src/lvm.c
View file

@ -229,17 +229,17 @@ static int forprep (lua_State *L, StkId ra) {
count /= l_castS2U(-(step + 1)) + 1u;
}
/* store the counter in place of the limit (which won't be
needed anymore */
needed anymore) */
setivalue(plimit, l_castU2S(count));
}
}
else { /* try making all values floats */
lua_Number init; lua_Number limit; lua_Number step;
if (unlikely(!tonumber(plimit, &limit)))
if (l_unlikely(!tonumber(plimit, &limit)))
luaG_forerror(L, plimit, "limit");
if (unlikely(!tonumber(pstep, &step)))
if (l_unlikely(!tonumber(pstep, &step)))
luaG_forerror(L, pstep, "step");
if (unlikely(!tonumber(pinit, &init)))
if (l_unlikely(!tonumber(pinit, &init)))
luaG_forerror(L, pinit, "initial value");
if (step == 0)
luaG_runerror(L, "'for' step is zero");
@ -292,7 +292,7 @@ void luaV_finishget (lua_State *L, const TValue *t, TValue *key, StkId val,
if (slot == NULL) { /* 't' is not a table? */
lua_assert(!ttistable(t));
tm = luaT_gettmbyobj(L, t, TM_INDEX);
if (unlikely(notm(tm)))
if (l_unlikely(notm(tm)))
luaG_typeerror(L, t, "index"); /* no metamethod */
/* else will try the metamethod */
}
@ -337,10 +337,7 @@ void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
lua_assert(isempty(slot)); /* slot must be empty */
tm = fasttm(L, h->metatable, TM_NEWINDEX); /* get metamethod */
if (tm == NULL) { /* no metamethod? */
if (isabstkey(slot)) /* no previous entry? */
slot = luaH_newkey(L, h, key); /* create one */
/* no metamethod and (now) there is an entry with given key */
setobj2t(L, cast(TValue *, slot), val); /* set its new value */
luaH_finishset(L, h, key, slot, val); /* set new value */
invalidateTMcache(h);
luaC_barrierback(L, obj2gco(h), val);
return;
@ -349,7 +346,7 @@ void luaV_finishset (lua_State *L, const TValue *t, TValue *key,
}
else { /* not a table; check metamethod */
tm = luaT_gettmbyobj(L, t, TM_NEWINDEX);
if (unlikely(notm(tm)))
if (l_unlikely(notm(tm)))
luaG_typeerror(L, t, "index");
}
/* try the metamethod */
@ -571,8 +568,13 @@ int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) {
if (ttype(t1) != ttype(t2) || ttype(t1) != LUA_TNUMBER)
return 0; /* only numbers can be equal with different variants */
else { /* two numbers with different variants */
lua_Integer i1, i2; /* compare them as integers */
return (tointegerns(t1, &i1) && tointegerns(t2, &i2) && i1 == i2);
/* One of them is an integer. If the other does not have an
integer value, they cannot be equal; otherwise, compare their
integer values. */
lua_Integer i1, i2;
return (luaV_tointegerns(t1, &i1, F2Ieq) &&
luaV_tointegerns(t2, &i2, F2Ieq) &&
i1 == i2);
}
}
/* values have same type and same variant */
@ -634,7 +636,8 @@ static void copy2buff (StkId top, int n, char *buff) {
** from 'L->top - total' up to 'L->top - 1'.
*/
void luaV_concat (lua_State *L, int total) {
lua_assert(total >= 2);
if (total == 1)
return; /* "all" values already concatenated */
do {
StkId top = L->top;
int n = 2; /* number of elements handled in this pass (at least 2) */
@ -653,7 +656,7 @@ void luaV_concat (lua_State *L, int total) {
/* collect total length and number of strings */
for (n = 1; n < total && tostring(L, s2v(top - n - 1)); n++) {
size_t l = vslen(s2v(top - n - 1));
if (unlikely(l >= (MAX_SIZE/sizeof(char)) - tl))
if (l_unlikely(l >= (MAX_SIZE/sizeof(char)) - tl))
luaG_runerror(L, "string length overflow");
tl += l;
}
@ -697,7 +700,7 @@ void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) {
}
default: { /* try metamethod */
tm = luaT_gettmbyobj(L, rb, TM_LEN);
if (unlikely(notm(tm))) /* no metamethod? */
if (l_unlikely(notm(tm))) /* no metamethod? */
luaG_typeerror(L, rb, "get length of");
break;
}
@ -713,7 +716,7 @@ void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) {
** otherwise 'floor(q) == trunc(q) - 1'.
*/
lua_Integer luaV_idiv (lua_State *L, lua_Integer m, lua_Integer n) {
if (unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */
if (l_unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */
if (n == 0)
luaG_runerror(L, "attempt to divide by zero");
return intop(-, 0, m); /* n==-1; avoid overflow with 0x80000...//-1 */
@ -733,7 +736,7 @@ lua_Integer luaV_idiv (lua_State *L, lua_Integer m, lua_Integer n) {
** about luaV_idiv.)
*/
lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) {
if (unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */
if (l_unlikely(l_castS2U(n) + 1u <= 1u)) { /* special cases: -1 or 0 */
if (n == 0)
luaG_runerror(L, "attempt to perform 'n%%0'");
return 0; /* m % -1 == 0; avoid overflow with 0x80000...%-1 */
@ -840,10 +843,12 @@ void luaV_finishOp (lua_State *L) {
int a = GETARG_A(inst); /* first element to concatenate */
int total = cast_int(top - 1 - (base + a)); /* yet to concatenate */
setobjs2s(L, top - 2, top); /* put TM result in proper position */
if (total > 1) { /* are there elements to concat? */
L->top = top - 1; /* top is one after last element (at top-2) */
luaV_concat(L, total); /* concat them (may yield again) */
}
L->top = top - 1; /* top is one after last element (at top-2) */
luaV_concat(L, total); /* concat them (may yield again) */
break;
}
case OP_CLOSE: case OP_RETURN: { /* yielded closing variables */
ci->u.l.savedpc--; /* repeat instruction to close other vars. */
break;
}
default: {
@ -921,7 +926,7 @@ void luaV_finishOp (lua_State *L) {
*/
#define op_arithfK(L,fop) { \
TValue *v1 = vRB(i); \
TValue *v2 = KC(i); \
TValue *v2 = KC(i); lua_assert(ttisnumber(v2)); \
op_arithf_aux(L, v1, v2, fop); }
@ -950,7 +955,7 @@ void luaV_finishOp (lua_State *L) {
*/
#define op_arithK(L,iop,fop) { \
TValue *v1 = vRB(i); \
TValue *v2 = KC(i); \
TValue *v2 = KC(i); lua_assert(ttisnumber(v2)); \
op_arith_aux(L, v1, v2, iop, fop); }
@ -1049,7 +1054,8 @@ void luaV_finishOp (lua_State *L) {
#define updatebase(ci) (base = ci->func + 1)
#define updatestack(ci) { if (trap) { updatebase(ci); ra = RA(i); } }
#define updatestack(ci) \
{ if (l_unlikely(trap)) { updatebase(ci); ra = RA(i); } }
/*
@ -1093,25 +1099,21 @@ void luaV_finishOp (lua_State *L) {
#define ProtectNT(exp) (savepc(L), (exp), updatetrap(ci))
/*
** Protect code that will finish the loop (returns) or can only raise
** errors. (That is, it will not return to the interpreter main loop
** after changing the stack or hooks.)
** Protect code that can only raise errors. (That is, it cannnot change
** the stack or hooks.)
*/
#define halfProtect(exp) (savestate(L,ci), (exp))
/* idem, but without changing the stack */
#define halfProtectNT(exp) (savepc(L), (exp))
/* 'c' is the limit of live values in the stack */
#define checkGC(L,c) \
{ luaC_condGC(L, L->top = (c), /* limit of live values */ \
{ luaC_condGC(L, (savepc(L), L->top = (c)), \
updatetrap(ci)); \
luai_threadyield(L); }
/* fetch an instruction and prepare its execution */
#define vmfetch() { \
if (trap) { /* stack reallocation or hooks? */ \
if (l_unlikely(trap)) { /* stack reallocation or hooks? */ \
trap = luaG_traceexec(L, pc); /* handle hooks */ \
updatebase(ci); /* correct stack */ \
} \
@ -1133,17 +1135,20 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
#if LUA_USE_JUMPTABLE
#include "ljumptab.h"
#endif
tailcall:
startfunc:
trap = L->hookmask;
returning: /* trap already set */
cl = clLvalue(s2v(ci->func));
k = cl->p->k;
pc = ci->u.l.savedpc;
if (trap) {
if (cl->p->is_vararg)
trap = 0; /* hooks will start after VARARGPREP instruction */
else if (pc == cl->p->code) /* first instruction (not resuming)? */
luaD_hookcall(L, ci);
ci->u.l.trap = 1; /* there may be other hooks */
if (l_unlikely(trap)) {
if (pc == cl->p->code) { /* first instruction (not resuming)? */
if (cl->p->is_vararg)
trap = 0; /* hooks will start after VARARGPREP instruction */
else /* check 'call' hook */
luaD_hookcall(L, ci);
}
ci->u.l.trap = 1; /* assume trap is on, for now */
}
base = ci->func + 1;
/* main loop of interpreter */
@ -1151,8 +1156,10 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
Instruction i; /* instruction being executed */
StkId ra; /* instruction's A register */
vmfetch();
// low-level line tracing for debugging Lua
// printf("line: %d\n", luaG_getfuncline(cl->p, pcRel(pc, cl->p)));
lua_assert(base == ci->func + 1);
lua_assert(base <= L->top && L->top < L->stack + L->stacksize);
lua_assert(base <= L->top && L->top < L->stack_last);
/* invalidate top for instructions not expecting it */
lua_assert(isIT(i) || (cast_void(L->top = base), 1));
vmdispatch (GET_OPCODE(i)) {
@ -1529,7 +1536,7 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
vmbreak;
}
vmcase(OP_CLOSE) {
Protect(luaF_close(L, ra, LUA_OK));
Protect(luaF_close(L, ra, LUA_OK, 1));
vmbreak;
}
vmcase(OP_TBC) {
@ -1607,47 +1614,54 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
vmbreak;
}
vmcase(OP_CALL) {
CallInfo *newci;
int b = GETARG_B(i);
int nresults = GETARG_C(i) - 1;
if (b != 0) /* fixed number of arguments? */
L->top = ra + b; /* top signals number of arguments */
/* else previous instruction set top */
ProtectNT(luaD_call(L, ra, nresults));
savepc(L); /* in case of errors */
if ((newci = luaD_precall(L, ra, nresults)) == NULL)
updatetrap(ci); /* C call; nothing else to be done */
else { /* Lua call: run function in this same C frame */
ci = newci;
ci->callstatus = 0; /* call re-uses 'luaV_execute' */
goto startfunc;
}
vmbreak;
}
vmcase(OP_TAILCALL) {
int b = GETARG_B(i); /* number of arguments + 1 (function) */
int nparams1 = GETARG_C(i);
/* delat is virtual 'func' - real 'func' (vararg functions) */
/* delta is virtual 'func' - real 'func' (vararg functions) */
int delta = (nparams1) ? ci->u.l.nextraargs + nparams1 : 0;
if (b != 0)
L->top = ra + b;
else /* previous instruction set top */
b = cast_int(L->top - ra);
savepc(ci); /* some calls here can raise errors */
savepc(ci); /* several calls here can raise errors */
if (TESTARG_k(i)) {
/* close upvalues from current call; the compiler ensures
that there are no to-be-closed variables here, so this
call cannot change the stack */
luaF_close(L, base, NOCLOSINGMETH);
luaF_closeupval(L, base); /* close upvalues from current call */
lua_assert(L->tbclist < base); /* no pending tbc variables */
lua_assert(base == ci->func + 1);
}
while (!ttisfunction(s2v(ra))) { /* not a function? */
luaD_tryfuncTM(L, ra); /* try '__call' metamethod */
b++; /* there is now one extra argument */
checkstackp(L, 1, ra);
checkstackGCp(L, 1, ra);
}
if (!ttisLclosure(s2v(ra))) { /* C function? */
luaD_call(L, ra, LUA_MULTRET); /* call it */
luaD_precall(L, ra, LUA_MULTRET); /* call it */
updatetrap(ci);
updatestack(ci); /* stack may have been relocated */
ci->func -= delta;
luaD_poscall(L, ci, cast_int(L->top - ra));
return;
ci->func -= delta; /* restore 'func' (if vararg) */
luaD_poscall(L, ci, cast_int(L->top - ra)); /* finish caller */
updatetrap(ci); /* 'luaD_poscall' can change hooks */
goto ret; /* caller returns after the tail call */
}
ci->func -= delta;
ci->func -= delta; /* restore 'func' (if vararg) */
luaD_pretailcall(L, ci, ra, b); /* prepare call frame */
goto tailcall;
goto startfunc; /* execute the callee */
}
vmcase(OP_RETURN) {
int n = GETARG_B(i) - 1; /* number of results */
@ -1658,7 +1672,7 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
if (TESTARG_k(i)) { /* may there be open upvalues? */
if (L->top < ci->top)
L->top = ci->top;
luaF_close(L, base, LUA_OK);
luaF_close(L, base, CLOSEKTOP, 1);
updatetrap(ci);
updatestack(ci);
}
@ -1666,26 +1680,31 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
ci->func -= ci->u.l.nextraargs + nparams1;
L->top = ra + n; /* set call for 'luaD_poscall' */
luaD_poscall(L, ci, n);
return;
updatetrap(ci); /* 'luaD_poscall' can change hooks */
goto ret;
}
vmcase(OP_RETURN0) {
if (L->hookmask) {
if (l_unlikely(L->hookmask)) {
L->top = ra;
halfProtectNT(luaD_poscall(L, ci, 0)); /* no hurry... */
savepc(ci);
luaD_poscall(L, ci, 0); /* no hurry... */
trap = 1;
}
else { /* do the 'poscall' here */
int nres = ci->nresults;
int nres;
L->ci = ci->previous; /* back to caller */
L->top = base - 1;
while (nres-- > 0)
for (nres = ci->nresults; l_unlikely(nres > 0); nres--)
setnilvalue(s2v(L->top++)); /* all results are nil */
}
return;
goto ret;
}
vmcase(OP_RETURN1) {
if (L->hookmask) {
if (l_unlikely(L->hookmask)) {
L->top = ra + 1;
halfProtectNT(luaD_poscall(L, ci, 1)); /* no hurry... */
savepc(ci);
luaD_poscall(L, ci, 1); /* no hurry... */
trap = 1;
}
else { /* do the 'poscall' here */
int nres = ci->nresults;
@ -1695,11 +1714,17 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
else {
setobjs2s(L, base - 1, ra); /* at least this result */
L->top = base;
while (--nres > 0) /* complete missing results */
setnilvalue(s2v(L->top++));
for (; l_unlikely(nres > 1); nres--)
setnilvalue(s2v(L->top++)); /* complete missing results */
}
}
return;
ret: /* return from a Lua function */
if (ci->callstatus & CIST_FRESH)
return; /* end this frame */
else {
ci = ci->previous;
goto returning; /* continue running caller in this frame */
}
}
vmcase(OP_FORLOOP) {
if (ttisinteger(s2v(ra + 2))) { /* integer loop? */
@ -1792,11 +1817,10 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
vmbreak;
}
vmcase(OP_VARARGPREP) {
luaT_adjustvarargs(L, GETARG_A(i), ci, cl->p);
updatetrap(ci);
if (trap) {
ProtectNT(luaT_adjustvarargs(L, GETARG_A(i), ci, cl->p));
if (l_unlikely(trap)) { /* previous "Protect" updated trap */
luaD_hookcall(L, ci);
L->oldpc = pc + 1; /* next opcode will be seen as a "new" line */
L->oldpc = 1; /* next opcode will be seen as a "new" line */
}
updatebase(ci); /* function has new base after adjustment */
vmbreak;

6
lua/src/lvm.h
View file

@ -60,12 +60,14 @@ typedef enum {
/* convert an object to an integer (including string coercion) */
#define tointeger(o,i) \
(ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointeger(o,i,LUA_FLOORN2I))
(l_likely(ttisinteger(o)) ? (*(i) = ivalue(o), 1) \
: luaV_tointeger(o,i,LUA_FLOORN2I))
/* convert an object to an integer (without string coercion) */
#define tointegerns(o,i) \
(ttisinteger(o) ? (*(i) = ivalue(o), 1) : luaV_tointegerns(o,i,LUA_FLOORN2I))
(l_likely(ttisinteger(o)) ? (*(i) = ivalue(o), 1) \
: luaV_tointegerns(o,i,LUA_FLOORN2I))
#define intop(op,v1,v2) l_castU2S(l_castS2U(v1) op l_castS2U(v2))