tree 196477b98a842c3c5349730c415cf582e62a1ebf
parent 5db0997bf67d6a4991cf4c80fce081da7a8a87d5
author Eric Fiselier <eric@efcs.ca> 1559957479 +0000
committer Eric Fiselier <eric@efcs.ca> 1559957479 +0000

Substantially reduce instantiations and debug size of std::function

std::function uses a standard allocator to manage its memory, however
standard allocators are templates and using them correctly requires
a stupid amount of instantiations. This leads to a substantial increase
in debug info and object sizes.

This patch addresses the issue by dropping the allocator when possible
and using raw new and delete to get memory.

This change decreases the object file size for the test func.wrap.func.con/F.pass.cpp by 33% and the final binary by 29% (when compiled with -g -ggnu-pubnames -gpubnames).

It also roughly halfs the number of entries in the pubnames and pubtype
sections.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@362865 91177308-0d34-0410-b5e6-96231b3b80d8