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Reduce number of addressing modes in GDScript VM

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There's now only 3 addressing modes: stack, constant, and member.

Self, class, and nil are now present respectively in the first 3 stack
slots. Global and class constants are moved to local constants when
compiling. Named globals is only present on editor to use on tool
singletons, so its use now emits a new instruction to copy the global to
the stack.

This allow us to further optimize the VM later by embedding the
addressing modes in the instructions themselves, which is better done
with less permutations.
This commit is contained in:
George Marques
2021-04-08 11:55:24 -03:00
parent 084b882c0a
commit cf4079cb5f
8 changed files with 129 additions and 194 deletions
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9
modules/gdscript/gdscript_compiler.cpp
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@@ -262,7 +262,7 @@ GDScriptCodeGenerator::Address GDScriptCompiler::_parse_expression(CodeGen &code
GDScriptNativeClass *nc = nullptr;
while (scr) {
if (scr->constants.has(identifier)) {
return GDScriptCodeGenerator::Address(GDScriptCodeGenerator::Address::CLASS_CONSTANT, gen->add_or_get_name(identifier)); // TODO: Get type here.
return codegen.add_constant(scr->constants[identifier]); // TODO: Get type here.
}
if (scr->native.is_valid()) {
nc = scr->native.ptr();
@@ -319,7 +319,8 @@ GDScriptCodeGenerator::Address GDScriptCompiler::_parse_expression(CodeGen &code
if (GDScriptLanguage::get_singleton()->get_global_map().has(identifier)) {
int idx = GDScriptLanguage::get_singleton()->get_global_map()[identifier];
return GDScriptCodeGenerator::Address(GDScriptCodeGenerator::Address::GLOBAL, idx); // TODO: Get type.
Variant global = GDScriptLanguage::get_singleton()->get_global_array()[idx];
return codegen.add_constant(global); // TODO: Get type.
}
// Try global classes.
@@ -347,7 +348,9 @@ GDScriptCodeGenerator::Address GDScriptCompiler::_parse_expression(CodeGen &code
#ifdef TOOLS_ENABLED
if (GDScriptLanguage::get_singleton()->get_named_globals_map().has(identifier)) {
return GDScriptCodeGenerator::Address(GDScriptCodeGenerator::Address::NAMED_GLOBAL, gen->add_or_get_name(identifier)); // TODO: Get type.
GDScriptCodeGenerator::Address global = codegen.add_temporary(); // TODO: Get type.
gen->write_store_named_global(global, identifier);
return global;
}
#endif