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Fix stack underflows when yielding twice

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Also, refactor GDScriptFunctionState::_signal_callback, removing some excessive repetition.
Fixes #30269.
This commit is contained in:
Bojidar Marinov
2019-07-17 23:47:00 +03:00
parent 72b5a9e476
commit 8336590154
1 changed files with 1 additions and 49 deletions
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50
modules/gdscript/gdscript_function.cpp
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@@ -1784,20 +1784,9 @@ GDScriptFunction::~GDScriptFunction() {
Variant GDScriptFunctionState::_signal_callback(const Variant **p_args, int p_argcount, Variant::CallError &r_error) { Variant GDScriptFunctionState::_signal_callback(const Variant **p_args, int p_argcount, Variant::CallError &r_error) {
if (state.instance_id && !ObjectDB::get_instance(state.instance_id)) {
#ifdef DEBUG_ENABLED
ERR_EXPLAIN("Resumed function '" + String(function->get_name()) + "()' after yield, but class instance is gone. At script: " + state.script->get_path() + ":" + itos(state.line));
ERR_FAIL_V(Variant());
#else
return Variant();
#endif
}
Variant arg; Variant arg;
r_error.error = Variant::CallError::CALL_OK; r_error.error = Variant::CallError::CALL_OK;
ERR_FAIL_COND_V(!function, Variant());
if (p_argcount == 0) { if (p_argcount == 0) {
r_error.error = Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS; r_error.error = Variant::CallError::CALL_ERROR_TOO_FEW_ARGUMENTS;
r_error.argument = 1; r_error.argument = 1;
@@ -1823,44 +1812,7 @@ Variant GDScriptFunctionState::_signal_callback(const Variant **p_args, int p_ar
return Variant(); return Variant();
} }
state.result = arg; return resume(arg);
Variant ret = function->call(NULL, NULL, 0, r_error, &state);
bool completed = true;
// If the return value is a GDScriptFunctionState reference,
// then the function did yield again after resuming.
if (ret.is_ref()) {
GDScriptFunctionState *gdfs = Object::cast_to<GDScriptFunctionState>(ret);
if (gdfs && gdfs->function == function) {
completed = false;
gdfs->first_state = first_state.is_valid() ? first_state : Ref<GDScriptFunctionState>(this);
}
}
function = NULL; //cleaned up;
state.result = Variant();
if (completed) {
if (first_state.is_valid()) {
first_state->emit_signal("completed", ret);
} else {
emit_signal("completed", ret);
}
}
#ifdef DEBUG_ENABLED
if (ScriptDebugger::get_singleton())
GDScriptLanguage::get_singleton()->exit_function();
if (state.stack_size) {
//free stack
Variant *stack = (Variant *)state.stack.ptr();
for (int i = 0; i < state.stack_size; i++)
stack[i].~Variant();
}
#endif
return ret;
} }
bool GDScriptFunctionState::is_valid(bool p_extended_check) const { bool GDScriptFunctionState::is_valid(bool p_extended_check) const {