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Reid Kleckner f30ad55559 [PGO] Use linkonce_odr linkage for __profd_ variables in comdat groups 
This fixes relocations against __profd_ symbols in discarded sections,
which is PR41380.

In general, instrumentation happens very early, and optimization and
inlining happens afterwards. The counters for a function are calculated
early, and after inlining, counters for an inlined function may be
widely referenced by other functions.

For C++ inline functions of all kinds (linkonce_odr &
available_externally mainly), instr profiling wants to deduplicate these
__profc_ and __profd_ globals. Otherwise the binary would be quite
large.

I made __profd_ and __profc_ comdat in r355044, but I chose to make
__profd_ internal. At the time, I was only dealing with coverage, and in
that case, none of the instrumentation needs to reference __profd_.
However, if you use PGO, then instrumentation passes add calls to
__llvm_profile_instrument_range which reference __profd_ globals. The
solution is to make these globals externally visible by using
linkonce_odr linkage for data as was done for counters.

This is safe because PGO adds a CFG hash to the names of the data and
counter globals, so if different TUs have different globals, they will
get different data and counter arrays.

Reviewers: xur, hans

Differential Revision: https://reviews.llvm.org/D67579

llvm-svn: 372020
2019-09-16 18:49:09 +00:00
benchmarks
bindings Bump llvm-go to C++14 2019-08-15 10:55:25 +00:00
cmake [CMake] Don't pass all LLVM_COMPILE_FLAGS to the C compiler 2019-09-10 14:19:52 +00:00
docs [docs][llvm-strings] Write llvm-strings documentation 2019-09-16 13:56:12 +00:00
examples [Orc] Roll back ThreadPool to std::function 2019-09-13 11:59:51 +00:00
include [NFC] remove unused functions 2019-09-16 14:48:58 +00:00
lib [PGO] Use linkonce_odr linkage for __profd_ variables in comdat groups 2019-09-16 18:49:09 +00:00
projects [libc++] Take 2: Integrate the PSTL into libc++ 2019-08-05 18:29:14 +00:00
resources
runtimes Revert "Adding support for overriding LLVM_ENABLE_RUNTIMES for runtimes builds." 2019-09-11 00:43:35 +00:00
test [PGO] Use linkonce_odr linkage for __profd_ variables in comdat groups 2019-09-16 18:49:09 +00:00
tools Added return statement to fix compile and build warning: 2019-09-16 10:30:37 +00:00
unittests [Remarks][NFC] Forward declare ParsedStringTable 2019-09-13 17:27:28 +00:00
utils gn build: Merge r371976 2019-09-16 11:33:54 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore gitignore: Ignore Qt Creator project configuration files. NFC 2019-06-12 08:28:31 +00:00
CMakeLists.txt Revert "[utils] Implement the llvm-locstats tool" 2019-09-10 14:48:52 +00:00
CODE_OWNERS.TXT Update email address in CODE_OWNERS 2019-07-01 16:01:15 +00:00
configure
CREDITS.TXT Update email address. 2019-07-17 07:02:02 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt
RELEASE_TESTERS.TXT

README.txt 

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