[PATCH] D18490: [PGO] Comment how function pointers for indirect calls are mapped to function names

[Adam Nemet via llvm-commits]

anemet created this revision.
anemet added reviewers: bogner, davidxl.
anemet added a subscriber: llvm-commits.

Hopefully this will make it easier for the next person to figure all
this out...

http://reviews.llvm.org/D18490

Files:
  include/llvm/ProfileData/InstrProfData.inc
  lib/ProfileData/InstrProfReader.cpp

Index: lib/ProfileData/InstrProfReader.cpp
===================================================================
--- lib/ProfileData/InstrProfReader.cpp
+++ lib/ProfileData/InstrProfReader.cpp
@@ -412,6 +412,9 @@
   if (VDataPtrOrErr.getError())
     return VDataPtrOrErr.getError();
 
+  // Note that besides deserialization, this also performs the conversion for
+  // indirect call targets.  The function pointers from the raw profile are
+  // remapped into function name hashes.
   VDataPtrOrErr.get()->deserializeTo(Record, &Symtab->getAddrHashMap());
   CurValueDataSize = VDataPtrOrErr.get()->getSize();
   return success();
Index: include/llvm/ProfileData/InstrProfData.inc
===================================================================
--- include/llvm/ProfileData/InstrProfData.inc
+++ include/llvm/ProfileData/InstrProfData.inc
@@ -73,6 +73,8 @@
 INSTR_PROF_DATA(const IntPtrT, llvm::Type::getInt64PtrTy(Ctx), CounterPtr, \
                 ConstantExpr::getBitCast(CounterPtr, \
                 llvm::Type::getInt64PtrTy(Ctx)))
+// This is used to map function pointers for the indirect call targets to
+// function name hashes during the conversion from raw to merged profile data.
 INSTR_PROF_DATA(const IntPtrT, llvm::Type::getInt8PtrTy(Ctx), FunctionPointer, \
                 FunctionAddr)
 INSTR_PROF_DATA(IntPtrT, llvm::Type::getInt8PtrTy(Ctx), Values, \


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