tree ad5e0e85a0b790112a9a6a877bb39cc0a645702b
parent 256f187bc66b6771968af526a4626c058dcc4c40
author Eric Fiselier <eric@efcs.ca> 1521693776 +0000
committer Eric Fiselier <eric@efcs.ca> 1521693776 +0000

Fix PR22634 - std::allocator doesn't respect over-aligned types.

This patch fixes std::allocator, and more specifically, all users
of __libcpp_allocate and __libcpp_deallocate, to support over-aligned
types.

__libcpp_allocate/deallocate now take an alignment parameter, and when
the specified alignment is greater than that supported by malloc/new,
the aligned version of operator new is called (assuming it's available).

When aligned new isn't available, the old behavior has been kept, and the
alignment parameter is ignored.

This patch depends on recent changes to __builtin_operator_new/delete which
allow them to be used to call any regular new/delete operator. By using
__builtin_operator_new/delete when possible, the new/delete erasure optimization
is maintained.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@328180 91177308-0d34-0410-b5e6-96231b3b80d8