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GDScript: Fix crash caused by uninitialized temp stack slots 

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.
pull/48793/head
George Marques 2021-05-17 10:59:43 +07:00
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
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12
modules/gdscript/gdscript_byte_codegen.cpp
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@ -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;
}
}

2
modules/gdscript/gdscript_function.h
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@ -496,6 +496,8 @@ private:
Vector<GDScriptDataType> argument_types;
GDScriptDataType return_type;
Map<int, Variant::Type> temporary_slots;
#ifdef TOOLS_ENABLED
Vector<StringName> arg_names;
Vector<Variant> default_arg_values;

42
modules/gdscript/gdscript_vm.cpp
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@ -152,6 +152,44 @@ String GDScriptFunction::_get_call_error(const Callable::CallError &p_err, const
return err_text;
}
void (*type_init_function_table[])(Variant *) = {
nullptr, // NIL (shouldn't be called).
&VariantInitializer<bool>::init, // BOOL.
&VariantInitializer<int64_t>::init, // INT.
&VariantInitializer<double>::init, // FLOAT.
&VariantInitializer<String>::init, // STRING.
&VariantInitializer<Vector2>::init, // VECTOR2.
&VariantInitializer<Vector2i>::init, // VECTOR2I.
&VariantInitializer<Rect2>::init, // RECT2.
&VariantInitializer<Rect2i>::init, // RECT2I.
&VariantInitializer<Vector3>::init, // VECTOR3.
&VariantInitializer<Vector3i>::init, // VECTOR3I.
&VariantInitializer<Transform2D>::init, // TRANSFORM2D.
&VariantInitializer<Plane>::init, // PLANE.
&VariantInitializer<Quat>::init, // QUAT.
&VariantInitializer<AABB>::init, // AABB.
&VariantInitializer<Basis>::init, // BASIS.
&VariantInitializer<Transform>::init, // TRANSFORM.
&VariantInitializer<Color>::init, // COLOR.
&VariantInitializer<StringName>::init, // STRING_NAME.
&VariantInitializer<NodePath>::init, // NODE_PATH.
&VariantInitializer<RID>::init, // RID.
&VariantTypeAdjust<Object *>::adjust, // OBJECT.
&VariantInitializer<Callable>::init, // CALLABLE.
&VariantInitializer<Signal>::init, // SIGNAL.
&VariantInitializer<Dictionary>::init, // DICTIONARY.
&VariantInitializer<Array>::init, // ARRAY.
&VariantInitializer<PackedByteArray>::init, // PACKED_BYTE_ARRAY.
&VariantInitializer<PackedInt32Array>::init, // PACKED_INT32_ARRAY.
&VariantInitializer<PackedInt64Array>::init, // PACKED_INT64_ARRAY.
&VariantInitializer<PackedFloat32Array>::init, // PACKED_FLOAT32_ARRAY.
&VariantInitializer<PackedFloat64Array>::init, // PACKED_FLOAT64_ARRAY.
&VariantInitializer<PackedStringArray>::init, // PACKED_STRING_ARRAY.
&VariantInitializer<PackedVector2Array>::init, // PACKED_VECTOR2_ARRAY.
&VariantInitializer<PackedVector3Array>::init, // PACKED_VECTOR3_ARRAY.
&VariantInitializer<PackedColorArray>::init, // PACKED_COLOR_ARRAY.
};
#if defined(__GNUC__)
#define OPCODES_TABLE \
static const void *switch_table_ops[] = { \
@ -491,6 +529,10 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
memnew_placement(&stack[ADDR_STACK_CLASS], Variant(script));
for (const Map<int, Variant::Type>::Element *E = temporary_slots.front(); E; E = E->next()) {
type_init_function_table[E->get()](&stack[E->key()]);
}
String err_text;
#ifdef DEBUG_ENABLED