CoverageMapping: Reader - update for the modified profile data format by add function's hash to coverage function records.

[arphaman]

Summary

Recently, the profile data format was updated to allow for multiple functions with the same name. The updated indexing api requires the code coverage tool to know the function's hash as well as the function's name to get the execution counts for a function. This patch updates the CoverageMappingReader which now also stores function hashes in function records.

[arphaman]

Closed by commit rL216207 (authored by @arphaman).

include/llvm/ProfileData/CoverageMappingReader.h

 /// \brief Coverage mapping information for a single function.
 struct CoverageMappingRecord {
   StringRef FunctionName;
+  uint64_t FunctionHash;
   ArrayRef<StringRef> Filenames;
   ArrayRef<CounterExpression> Expressions;
   ArrayRef<CounterMappingRegion> MappingRegions;

   struct ProfileMappingRecord {
     CoverageMappingVersion Version;
     StringRef FunctionName;
+    uint64_t FunctionHash;
     StringRef CoverageMapping;
     size_t FilenamesBegin;
     size_t FilenamesSize;
 
     ProfileMappingRecord(CoverageMappingVersion Version, StringRef FunctionName,
-                         StringRef CoverageMapping, size_t FilenamesBegin,
-                         size_t FilenamesSize)
+                         uint64_t FunctionHash, StringRef CoverageMapping,
+                         size_t FilenamesBegin, size_t FilenamesSize)
         : Version(Version), FunctionName(FunctionName),
-          CoverageMapping(CoverageMapping), FilenamesBegin(FilenamesBegin),
-          FilenamesSize(FilenamesSize) {}
+          FunctionHash(FunctionHash), CoverageMapping(CoverageMapping),
+          FilenamesBegin(FilenamesBegin), FilenamesSize(FilenamesSize) {}
   };
 
 private:

lib/ProfileData/CoverageMappingReader.cpp

   IntPtrT FunctionNamePtr;
   uint32_t FunctionNameSize;
   uint32_t CoverageMappingSize;
+  uint64_t FunctionHash;
 };
 
 /// \brief The coverage mapping data for a single translation unit.

                                           FunctionName))
         return Err;
       Records.push_back(ObjectFileCoverageMappingReader::ProfileMappingRecord(
-          Version, FunctionName, Mapping, FilenamesBegin,
-          Filenames.size() - FilenamesBegin));
+          Version, FunctionName, MappingRecord.FunctionHash, Mapping,
+          FilenamesBegin, Filenames.size() - FilenamesBegin));
     }
   }
 

       FunctionsFilenames, Expressions, MappingRegions);
   if (auto Err = Reader.read(Record))
     return Err;
+  Record.FunctionHash = R.FunctionHash;
   ++CurrentRecord;
   return success();
 }