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| author | Adam Nemet <anemet@apple.com> | 2016-03-28 22:15:15 +0000 |
|---|---|---|
| committer | Adam Nemet <anemet@apple.com> | 2016-03-28 22:15:15 +0000 |
| commit | 9734583a92f283effb532869d6681394f0ba34df (patch) | |
| tree | 639e1e67c82104caa0c8e2843c28f485a9d8e062 /llvm/include | |
| parent | 3e9664fd604f8e8ff47f52c22ee490c819e137a8 (diff) | |
| download | bcm5719-llvm-9734583a92f283effb532869d6681394f0ba34df.tar.gz bcm5719-llvm-9734583a92f283effb532869d6681394f0ba34df.zip | |
[PGO] More comments how function pointers for indirect calls are mapped
to function names
Summary:
Hopefully this will make it easier for the next person to figure all
this out...
Reviewers: bogner, davidxl
Subscribers: davidxl, cfe-commits
Differential Revision: http://reviews.llvm.org/D18489
llvm-svn: 264678
Diffstat (limited to 'llvm/include')
| -rw-r--r-- | llvm/include/llvm/ProfileData/InstrProfData.inc | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/include/llvm/ProfileData/InstrProfData.inc b/llvm/include/llvm/ProfileData/InstrProfData.inc index c4a70529289..b092c3bbe66 100644 --- a/llvm/include/llvm/ProfileData/InstrProfData.inc +++ b/llvm/include/llvm/ProfileData/InstrProfData.inc @@ -133,6 +133,15 @@ VALUE_PROF_FUNC_PARAM(uint32_t, CounterIndex, Type::getInt32Ty(Ctx)) #else #define INSTR_PROF_DATA_DEFINED #endif +/* For indirect function call value profiling, the addresses of the target + * functions are profiled by the instrumented code. The target addresses are + * written in the raw profile data and converted to target function name's MD5 + * hash by the profile reader during deserialization. Typically, this happens + * when the the raw profile data is read during profile merging. + * + * For this remapping the ProfData is used. ProfData contains both the function + * name hash and the function address. + */ VALUE_PROF_KIND(IPVK_IndirectCallTarget, 0) /* These two kinds must be the last to be * declared. This is to make sure the string |
