Commit graph

28 commits

Author SHA1 Message Date
Christoph Oelckers
97b664968e - removed a few unused VM opcodes. 2017-05-19 10:27:22 +02:00
Christoph Oelckers
6599e2c425 - moved the VM types into their own file and only include it where really needed. 2017-04-13 01:12:04 +02:00
Christoph Oelckers
7a6e70e777 - reenabled the part of OP_THROW that throws a VMAbortException. This part is still needed for a runtime variable access check. 2017-04-11 00:11:36 +02:00
alexey.lysiuk
d5edd3db36 Commented out remains of VM exception handling opcodes
This fixes build with GCC/Clang
2017-04-10 22:18:43 +03:00
Christoph Oelckers
e2f3a09dd0 - refactored the scope check for VirtualScope calls.
It now uses a dedicated opcode instead of piggybacking on OP_CALL and it passes data that is closer to the VM. Symbols should be avoided at this level.
It also will skip the scope instruction if the code generator detects that both calling function and the self pointer type have the same scope, this assumes that subclasses cannot flip between UI and Play.
2017-03-07 22:17:48 +01:00
Christoph Oelckers
0c686c593b - simplify the runtime checks for OP_NEW.
They are not needed for OP_NEW_K which can evaluate the class relations at compile time and for OP_NEW the calling function can also be checked at compile time, passing only the scope value itself.
2017-03-07 19:57:55 +01:00
Christoph Oelckers
f343d36ea9 - implemented the basics of a working metadata system.
This will store class meta properties in a separate memory block so that it won't have to muck around with PClass - which made the implementation from the scripting branch relatively useless because extending the data wasn't particularly easy and also not well implemented. This can now be handled just like the defaults.
2017-02-27 23:28:19 +01:00
Christoph Oelckers
5bc26763cb - fixed: String CVARs get stored as a const char *, not an FString, so the ls opcode cannot be used to read their content. 2017-02-23 22:01:46 +01:00
Christoph Oelckers
89ef30166d - fixed assembly output for SO instruction. 2017-02-13 00:25:39 +01:00
Christoph Oelckers
56024a1ebe - implemented the backend for dynamic arrays. Still needs thorough testing but it should be complete.
- use a memory arena to store flat pointers so that the messed up cleanup can be avoided by deallocating this in bulk.
- added a new SO opcode to the VM to execute a write barrier. This is necessary for all objects that are not linked into one global table, i.e. everything except thinkers and class types.
- always use the cheaper LOS opcode for reading pointers to classes and defaults because these cannot be destroyed during normal operation.
- removed the pointless validation from String.Mid. If the values are read as unsigned the internal validation of FString::Mid will automatically ensure proper results.
2017-02-07 14:48:27 +01:00
Christoph Oelckers
43d759782d - fixed: Stack based local VM object pointers should not be subjected to a read barrier.
This isn't done for register based variables so for consistency it should not be done for stack based variables, too.
This difference in handling made it impossible to check the target of a hitscan attack if it was destroyed by getting damaged.
2017-02-04 16:23:14 +01:00
Christoph Oelckers
8578a5a12e - added a 'new' intrinsic to create new objects from inside scripts.
This is not tested yet and likely to not working correctly yet. Will be fixed once I get far enough to use it later.
2017-02-03 22:56:03 +01:00
Christoph Oelckers
14f2c39e58 - scriptified cht_Give and cht_Take and made them virtual function of PlayerPawn so that this can be better configured for mods that want other options in here.
- improved the class pointer to string cast to print the actual type it describes and not the class pointer's own type.
- fixed: The 'is' operator created non-working code when checking the inheritance of a class pointer, it only worked for objects.
2017-01-17 17:34:39 +01:00
ZZYZX
a8beb51ca3 Changed opcode implementation to native function implementation 2017-01-13 22:59:45 +01:00
ZZYZX
e75aa08d0a Implemented format() builtin call 2017-01-13 22:59:45 +01:00
Christoph Oelckers
092461ed34 - make dynamic object casts a dedicated VM instruction instead of a builtin function.
This can see some heavy use in iterators where saving several hundreds of function calls can be achieved. In these cases, using a function to do the job will become a significant time waster.
2016-12-05 14:52:34 +01:00
Christoph Oelckers
7688e14bec - added a boolean cast VM instruction.
Although this already helps a lot with the messed up code generated for comparisons it's not really a solution for this - it still needs a proper implementation to generate efficient code.
2016-12-01 01:13:53 +01:00
Christoph Oelckers
de6969997a - scriptified Hexen's flies.
A few notes:

 * this accesses the lines array in sector_t which effectively is a pointer to an array of pointers - a type the parser can not represent. The compiler has no problems with it, so for now it is defined internally.
 * array sizes were limited to 65536 entries because the 'bound' instruction only existed as an immediate version with no provisions for larger values. For the static map arrays 65536 is not sufficient so now there are alternative instructions for these cases.
 * despite the above, at the moment there is no proper bounds checking for arrays that have no fixed size. To do this, a lot more work is needed. The type system as-is is not prepared for such a scenario.
2016-11-27 18:52:24 +01:00
Christoph Oelckers
9ae272d753 - scriptified Heretic's blaster.
- scriptified all Effect functions of Fastprojectile's children
- implemented access to class meta data.
- added a VM instruction to retrieve the class metadata, to eliminate the overhead of the function call that would otherwise be needed.
- made GetClass() a builtin so that it can use the new instruction

Important note about this commit: Scriptifying CFlameMissile::Effect revealed a problem with the virtual function interface: In order to work, this needs to be explicitly enabled for each single native class that may be used as a base for a scripted class. Needless to say, this will end up way too much work, as there are over 100 native classes, excluding those which will be scriptified. But in order to fix the problem this partially broken state needs to be committed first.
2016-11-24 20:02:44 +01:00
Christoph Oelckers
e93961da96 - removed all constant versions of vector instructions. The vector code does not use compound constants so there's no need to have instructions for them.
- fixed: The code generator had no good safeguards for exceeding the maximum amount of registers.

All there was was a handful of pitiful asserts which in production code do nothing at all but generate broken output.
Even worse, the VM was hardwired to at most 255 constants per type per function by storing the constant count in a byte! This has been extended to 65535, but since many instructions only have a byte available for the constant index, a workaround had to be added to do a two-instruction setup if larger indices are needed.
2016-11-20 23:00:05 +01:00
Christoph Oelckers
5951a9449c - added static constant arrays. At the moment they can only be defined inside functions due to lack of dedicated storage inside classes for static data.
- added new VM instructions to access the constant tables with a variable index.
- refactored VMFunctionBuilder's constant tables so that they are not limited to one entry per value. While this works fine for single values, it makes it impossible to store constant arrays in here.
2016-11-20 18:00:37 +01:00
Christoph Oelckers
34c949f84b - implemented the string concatenation operator '..'. This is capable of stringifying all of the common types for output.
- gave OP_CONCAT some sane semantics. The way this was defined, by specifying the source operands as a range of registers instead of a pair like everything else made it completely useless for the task at hand.
- changed formatting for floats to %.5f which for normal output in a game makes more sense. For special cases there should be a special formatting function for ints and floats that can do more specialized conversions.
2016-11-18 17:44:25 +01:00
Christoph Oelckers
72e77a6c65 - implemented handling for virtual function.
Syntax-wise I chose to make it as strict as possible to reduce the chance of errors: Virtual base functions must be declared with the 'virtual' keyword, and overrides in child classes with the 'override' keyword. This way any mismatch in parameters that otherwise would cause silent failure will outright produce a compile error.
2016-11-11 20:05:07 +01:00
Christoph Oelckers
e5878f0cb2 - implemented vector operations. Vectors are now fully working as local variables.
- removed mulv_kr and divv_kr instructions. The first are redundant and the second are useless. Maybe remove all other vector/const operations as well? They won't get used by the code generator.
- fixed disassembly of vector multiplication and division instructions.
2016-10-29 01:39:25 +02:00
Christoph Oelckers
3b1f411dce - added a full set of 2D vector instructions to the VM. The existing one was 3D only but there's also need to handle two-dimensional vectors.
- added the missing divv* instructions.
2016-10-28 10:13:07 +02:00
Christoph Oelckers
f9cd2c9af7 - added switch/case processing. Right now it is just a sequence of test/jmp instructions. It may make sense to add a special opcode that can perform the comparisons natively but that's an option for later.
- added a TESTN instruction. This is like TEST but negates the operand. This was added to avoid flooding the constant table with too many case labels. With TEST and TESTN combined, all numbers between -65535 and 65535 can be kept entirely inside the instruction. Numbers outside this range still use a BEQ instruction.
2016-10-23 12:00:25 +02:00
Marisa Heit
1652c02a08 Add unsigned division opcodes to the VM 2016-10-17 22:37:49 -05:00
Christoph Oelckers
b1a83bfd26 - started with cleanup and separation of DECORATE code.
* everything related to scripting is now placed in a subdirectory 'scripting', which itself is separated into DECORATE, ZSCRIPT, the VM and code generation.
 * a few items have been moved to different headers so that the DECORATE parser definitions can mostly be kept local. The only exception at the moment is the flags interface on which 3 source files depend.
2016-10-12 19:22:33 +02:00
Renamed from src/zscript/vmops.h (Browse further)