Stowage/godot
2
0
Fork 0
mirror of https://github.com/godotengine/godot.git synced 2025-10-19 16:03:29 +00:00
Code Issues Projects Releases Packages Wiki Activity

GDScript: Fix crash caused by uninitialized temp stack slots

Browse source 
This adds initialization to every typed temporary stack slot at the
beginning of the function call instead of emitting instructions, since
those might be in a conditional branch and not be called.
This commit is contained in:
George Marques 2021-05-17 10:59:43 -03:00
parent c3002c0955
commit 10a1f64968
No known key found for this signature in database
GPG key ID: 046BD46A3201E43D
3 changed files with 49 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

12
modules/gdscript/gdscript_byte_codegen.cpp
View file

@ -129,12 +129,6 @@ uint32_t GDScriptByteCodeGenerator::add_temporary(const GDScriptDataType &p_type
int idx = temporaries.size();
pool.push_back(idx);
temporaries.push_back(new_temp);
// First time using this, so adjust to the proper type.
if (temp_type != Variant::NIL) {
Address addr(Address::TEMPORARY, idx, p_type);
write_type_adjust(addr, temp_type);
}
}
int slot = pool.front()->get();
pool.pop_front();
@ -189,8 +183,12 @@ GDScriptFunction *GDScriptByteCodeGenerator::write_end() {
append(GDScriptFunction::OPCODE_END, 0);
for (int i = 0; i < temporaries.size(); i++) {
int stack_index = i + max_locals + RESERVED_STACK;
for (int j = 0; j < temporaries[i].bytecode_indices.size(); j++) {
opcodes.write[temporaries[i].bytecode_indices[j]] = (i + max_locals + RESERVED_STACK) | (GDScriptFunction::ADDR_TYPE_STACK << GDScriptFunction::ADDR_BITS);
opcodes.write[temporaries[i].bytecode_indices[j]] = stack_index | (GDScriptFunction::ADDR_TYPE_STACK << GDScriptFunction::ADDR_BITS);
}
if (temporaries[i].type != Variant::NIL) {
function->temporary_slots[stack_index] = temporaries[i].type;
}
}