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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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2
core/ref_ptr.cpp
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@@ -69,7 +69,7 @@ RID RefPtr::get_rid() const {
Ref<Reference> *ref = reinterpret_cast<Ref<Reference> *>(&data[0]);
if (ref->is_null())
return RID();
Resource *res = (*ref)->cast_to<Resource>();
Resource *res = Object::cast_to<Resource>(ref->ptr());
if (res)
return res->get_rid();
return RID();