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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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6
modules/nativescript/nativescript.cpp
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@ -399,7 +399,7 @@ Variant NativeScript::_new(const Variant **p_args, int p_argcount, Variant::Call
owner = memnew(Reference);
}
Reference *r = owner->cast_to<Reference>();
Reference *r = Object::cast_to<Reference>(owner);
if (r) {
ref = REF(r);
}
@ -1203,11 +1203,11 @@ Error ResourceFormatSaverNativeScript::save(const String &p_path, const RES &p_r
}
bool ResourceFormatSaverNativeScript::recognize(const RES &p_resource) const {
return p_resource->cast_to<NativeScript>() != NULL;
return Object::cast_to<NativeScript>(*p_resource) != NULL;
}
void ResourceFormatSaverNativeScript::get_recognized_extensions(const RES &p_resource, List<String> *p_extensions) const {
if (p_resource->cast_to<NativeScript>()) {
if (Object::cast_to<NativeScript>(*p_resource)) {
p_extensions->push_back("gdns");
}
}