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Richard Smith 6c67662816 Add a flag to remap manglings when reading profile data information. 
This can be used to preserve profiling information across codebase
changes that have widespread impact on mangled names, but across which
most profiling data should still be usable. For example, when switching
from libstdc++ to libc++, or from the old libstdc++ ABI to the new ABI,
or even from a 32-bit to a 64-bit build.

The user can provide a remapping file specifying parts of mangled names
that should be treated as equivalent (eg, std::__1 should be treated as
equivalent to std::__cxx11), and profile data will be treated as
applying to a particular function if its name is equivalent to the name
of a function in the profile data under the provided equivalences. See
the documentation change for a description of how this is configured.

Remapping is supported for both sample-based profiling and instruction
profiling. We do not support remapping indirect branch target
information, but all other profile data should be remapped
appropriately.

Support is only added for the new pass manager. If someone wants to also
add support for this for the old pass manager, doing so should be
straightforward.

This is the LLVM side of Clang r344199.

Reviewers: davidxl, tejohnson, dlj, erik.pilkington

Subscribers: mehdi_amini, steven_wu, dexonsmith, llvm-commits

Differential Revision: https://reviews.llvm.org/D51249

llvm-svn: 344200
 		2018-10-10 23:13:47 +00:00
clang Add a flag to remap manglings when reading profile data information. 2018-10-10 23:13:35 +00:00
clang-tools-extra Lift VFS from clang to llvm (NFC) 2018-10-10 13:27:25 +00:00
compiler-rt [hwasan] when reporting a bug, print some very basic information about the heap chunk (in addition to the more detailed info that we may fail to show) 2018-10-10 22:24:44 +00:00
debuginfo-tests Revert "(Retry) Add a basic integration test for C++ smart pointers" 2018-08-20 19:53:33 +00:00
libclc configure: Rework support for gfx9+ devices that were added post LLVM 3.9 2018-09-15 22:02:01 +00:00
libcxx Use TEST_STD_VER instead of __cplusplus [NFC] 2018-10-10 22:35:24 +00:00
libcxxabi [libcxxabi] Allow building with sanitizers enabled 2018-10-10 22:00:58 +00:00
libunwind [CMake] Link to compiler-rt if LIBUNWIND_USE_COMPILER_RT is ON. 2018-10-08 18:35:00 +00:00
lld Make a member function private and rename it to avoid function overloading. 2018-10-10 22:49:29 +00:00
lldb [SymbolFileNativePDB] Fix compilation errors with gcc. 2018-10-10 18:52:37 +00:00
llgo Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm Add a flag to remap manglings when reading profile data information. 2018-10-10 23:13:47 +00:00
openmp [OpenMP] Convert KMP_DYNAMIC_LIB to a 0 or 1 guard everywhere 2018-10-05 17:59:39 +00:00
parallel-libs Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
polly [IslAst] Fix InParallelFor nesting. 2018-09-27 13:39:37 +00:00
README.md
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README.md

Low Level Virtual Machine (LLVM)

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.