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Convert Object::cast_to() to the static version

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Currently we rely on some undefined behavior when Object->cast_to() gets
called with a Null pointer. This used to work fine with GCC < 6 but
newer versions of GCC remove all codepaths in which the this pointer is
Null. However, the non-static cast_to() was supposed to be null safe.

This patch makes cast_to() Null safe and removes the now redundant Null
checks where they existed.

It is explained in this article: https://www.viva64.com/en/b/0226/
This commit is contained in:
Hein-Pieter van Braam
2017-08-24 22:58:51 +02:00
parent 4aa2c18cb4
commit cacced7e50
185 changed files with 1314 additions and 1508 deletions
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4
core/object.cpp
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@@ -654,7 +654,7 @@ void Object::call_multilevel(const StringName &p_method, const Variant **p_args,
if (p_method == CoreStringNames::get_singleton()->_free) {
#ifdef DEBUG_ENABLED
if (cast_to<Reference>()) {
if (Object::cast_to<Reference>(this)) {
ERR_EXPLAIN("Can't 'free' a reference.");
ERR_FAIL();
return;
@@ -900,7 +900,7 @@ Variant Object::call(const StringName &p_method, const Variant **p_args, int p_a
r_error.error = Variant::CallError::CALL_ERROR_TOO_MANY_ARGUMENTS;
return Variant();
}
if (cast_to<Reference>()) {
if (Object::cast_to<Reference>(this)) {
r_error.argument = 0;
r_error.error = Variant::CallError::CALL_ERROR_INVALID_METHOD;
ERR_EXPLAIN("Can't 'free' a reference.");