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InstrProf: Simplify the construction of BinaryCoverageReader

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Creating BinaryCoverageReader is a strange and complicated dance where
the constructor sets error codes that member functions will later
read, and the object is in an invalid state if readHeader isn't
immediately called after construction.

Instead, make the constructor private and add a static create method
to do the construction properly. This also has the benefit of removing
readHeader completely and simplifying the interface of the object.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230676 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Justin Bogner
2015-02-26 20:06:28 +00:00
parent 090b50ca27
commit c0c2133484
3 changed files with 64 additions and 84 deletions
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10
lib/ProfileData/CoverageMapping.cpp
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@@ -219,16 +219,18 @@ CoverageMapping::load(CoverageMappingReader &CoverageReader,
ErrorOr<std::unique_ptr<CoverageMapping>>
CoverageMapping::load(StringRef ObjectFilename, StringRef ProfileFilename) {
auto CounterMappingBuff = MemoryBuffer::getFileOrSTDIN(ObjectFilename);
if (auto EC = CounterMappingBuff.getError())
if (std::error_code EC = CounterMappingBuff.getError())
return EC;
BinaryCoverageReader CoverageReader(CounterMappingBuff.get());
if (auto EC = CoverageReader.readHeader())
auto CoverageReaderOrErr =
BinaryCoverageReader::create(CounterMappingBuff.get());
if (std::error_code EC = CoverageReaderOrErr.getError())
return EC;
auto CoverageReader = std::move(CoverageReaderOrErr.get());
auto ProfileReaderOrErr = IndexedInstrProfReader::create(ProfileFilename);
if (auto EC = ProfileReaderOrErr.getError())
return EC;
auto ProfileReader = std::move(ProfileReaderOrErr.get());
return load(CoverageReader, *ProfileReader);
return load(*CoverageReader, *ProfileReader);
}
namespace {