Segfaulting when trying to produce an error message doesn't help get the
message out. Sure, `obj_error (nil...)` is a bit of an abuse, but it
shouldn't segfault the engine.
Some of them, especially in rua_obj, were quite legitimate and even a
problem for thread-safety (rua_cmd is currently not thread-safe, but it
needs a lock, which I don't feel like doing at this stage).
It should have been this way all along, and it seems I thought they were
when I did rua_gui.c as it already freed its resource block, which would
have been a double free (oops). Fixes an invalid write when shutting
down progs in qwaq-cmd (relevant change not committed).
-describe is sent to the object, and the returned string passed back.
There is a worry about the lifetime of the returned string as there's
currently no way of both ensuring it doesn't get freed prematurely and
ensuring it does eventually get freed.
And use it for Ruamoko object reference counts.
I need reference counts for dealing with block sound buffers since they
can be shared by many channels. I figured I take care of Ruamoko's
reference count location at the same time.
Fixes#27.
This is meant for a "permanent" tear-down before freeing the memory
holding the VM state or at program shutdown. As a consequence, builtin
sub-systems registering resources are now required to pass a "destroy"
function pointer that will be called just before the memory holding
those resources is freed by the VM resource manager (ie, the manager
owns the resource memory block, but each subsystem is responsible for
cleaning up any resources held within that block).
This even enhances thread-safety in rua_obj (there are some problems
with cmd, cvar, and gib).
pr_type_t now contains only the one "value" field, and all the access
macros now use their PACKED variant for base access, making access to
larger types more consistent with the smaller types.
This is an extremely extensive patch as it hits every cvar, and every
usage of the cvars. Cvars no longer store the value they control,
instead, they use a cexpr value object to reference the value and
specify the value's type (currently, a null type is used for strings).
Non-string cvars are passed through cexpr, allowing expressions in the
cvars' settings. Also, cvars have returned to an enhanced version of the
original (id quake) registration scheme.
As a minor benefit, relevant code having direct access to the
cvar-controlled variables is probably a slight optimization as it
removed a pointer dereference, and the variables can be located for data
locality.
The static cvar descriptors are made private as an additional safety
layer, though there's nothing stopping external modification via
Cvar_FindVar (which is needed for adding listeners).
While not used yet (partly due to working out the design), cvars can
have a validation function.
Registering a cvar allows a primary listener (and its data) to be
specified: it will always be called first when the cvar is modified. The
combination of proper listeners and direct access to the controlled
variable greatly simplifies the more complex cvar interactions as much
less null checking is required, and there's no need for one cvar's
callback to call another's.
nq-x11 is known to work at least well enough for the demos. More testing
will come.
This is the bulk of the work for recording the resource pointer with
with builtin data. I don't know how much of a difference it makes for
most things, but it's probably pretty big for qwaq-curses due to the
very high number of calls to the curses builtins.
Closes#26
The zone memory block header is 64 bytes, so allocating a single 8 byte
selector is rather wasteful. Instead, allocate selectors in large chunks
(currently 64) and divvy them out as needed. Significantly reduces
memory pressure in large Ruamoko progs.
This gets message forwarding apparently working, though something isn't
quite right as qwaq-app doesn't update properly when I try to step
through the program, but that could be an error elsewhere.
This takes care of the problems with PR_RESET_PARAMS (which has recently
become just a wrapper for PR_SetupParams) changing the stack and causing
PR_CallFunction to save the wrong stack pointer. Message forwarding is
currently broken for Ruamoko ISA progs, but that is due to not having a
valid pr_argc. However, I do have a plan involving extracting the
parameter count from the selector, but that's something for a later
commit. Everything else seems to be ok (my little game is working
nicely).
obj_msg_sendv needs to push the parameters onto the stack for Ruamoko
progs, but this causes problems because PR_CallFunction winds up
recording the wrong stack pointer for progs functions, and nothing
restores the stack for builtins. The handling is basically the same as
for the return pointer.
In Ruamoko ISA progs, the param pointers point to the stack and
generally must most be manipulated by builtins, and there is no need
anyway as Ruamoko doesn't have RCALL. Fixes the mangling of .super.
This is part of the work for #26 (Record resource pointer with builtin
function data). Currently, the data pointer gets as far as the
per-instance VM function table (I don't feel like tackling the job of
converting all the builtin functions tonight). All the builtin modules
that register a resources data block pass that block on to
PR_RegisterBuiltins.
This will make it possible for the engine to set up their parameter
pointers when running Ruamoko progs. At this stage, it doesn't matter
*too* much, except for varargs functions, because no builtin yet takes
anything larger than a float quaternion, but it will be critical when
double or long vec3 and vec4 values are passed.
And other related fields so integer is now int (and uinteger is uint). I
really don't know why I went with integer in the first place, but this
will make using macros easier for dealing with types.
They are both gone, and pr_pointer_t is now pr_ptr_t (pointer may be a
little clearer than ptr, but ptr is consistent with things like intptr,
and keeps the type name short).
This required delaying the setting of the return pointer by call until
after the current pointer had been saved, and thus passing the desired
pointer into PR_CallFunction (which does have some advantages for C
functions calling progs functions, but some dangers too (should ensure a
128 byte (32 word) buffer when calling untrusted code (which is any,
really)).
The list of all allocated dispatch tables is used to free all the tables
when the progs are reloaded. Not clearing the list meant that the next
instance (second map change) corrupted the list.
I had forgotten that _size was the number of rows in the map, not the
number of objects (1024 objects per row). This fixes the missed device
removal messages. And probably a slew of other bugs I'd yet to encounter
:P
I never liked that some of the macros needed the type as a parameter
(yay typeof and __auto_type) or those that returned a value hid the
return statement so they couldn't be used in assignments.
The problem was caused by passing the index into the dtables array to
dtable_get which expects a handle. A handle is the ones-compliment
negative of the index which means that handle 0 is invalid (but 0 was
being passed... oops). Fixes the segfault when qw-client-x11 connects to
a server.
They take a pointer to a free-list used for hashlinks so the hashlink
pools can be per-thread. However, hash tables that are not updated are
always thread-safe, so this affects only updates. progs_t has been set
up such that it is easy for multiple progs within one thread can share
hashlinks.
This causes the block to be freed when the forward: handler returns
(assuming it's not yet another builtin). This is necessary so calling a
lot of forwarded messages in a loop doesn't leak memory (though it will
get freed eventually).
With this, object's implementing forward:: seem to accept the message
well, including receiving all the original args (not quite sure how to
deal with them in ruamoko code just yet, though).
libr supplies an __obj_forward definition that links to a builtin, but
as it is the only def in its object file, it is readily replaceable by
an alternative Ruamoko implementation.
The builtin version currently simply errors out (rather facetiously),
but only as a stub to allow progs to load.
This should speed up ruamoko code somewhat as hash table lookups have
been replaced with direct array indexing. As a bonus, support for
message forwarding has been added (though not tested).
Move the semi-permanent resource initialisation into the module init and
the cleanup of those resources into cleanup. Makes actual runtime init
much easier to read.
