commit af15bb4cdfc82d030d5826b0ecdc915652cacb80
author Louis Dionne <ldionne@apple.com> Tue Feb 12 16:06:02 2019 +0000
committer Louis Dionne <ldionne@apple.com> Tue Feb 12 16:06:02 2019 +0000
tree 94ac4a15aaf438ba4db6452bb7cf9580521f3d47
parent f759756c126dcf3f24f7636cf071a4db0f574186

[libc++] Avoid UB in the no-exceptions mode in a few places

Summary:
A few places in the library seem to behave unexpectedly when the library
is compiled or used with exceptions disabled. For example, not throwing
an exception when a pointer is NULL can lead us to dereference the pointer
later on, which is UB. This patch fixes such occurences.

It's hard to tell whether there are other places where the no-exceptions
mode misbehaves like this, because the replacement for throwing an
exception does not always seem to be abort()ing, but at least this
patch will improve the situation somewhat.

See http://lists.llvm.org/pipermail/libcxx-dev/2019-January/000172.html

Reviewers: mclow.lists, EricWF

Subscribers: christof, jkorous, dexonsmith, libcxx-commits

Differential Revision: https://reviews.llvm.org/D57761

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@353850 91177308-0d34-0410-b5e6-96231b3b80d8