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(NFC) Track global summary liveness in GVFlags.

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Replace GVFlags::LiveRoot with GVFlags::Live and use that instead of
all the DeadSymbols sets. This is refactoring in order to make
liveness information available in the RegularLTO pipeline.

llvm-svn: 304466
This commit is contained in:
Evgeniy Stepanov
2017-06-01 20:30:06 +00:00
parent a5dbbc6ead
commit 56584bbf16
8 changed files with 114 additions and 103 deletions
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6
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -865,11 +865,11 @@ static GlobalValueSummary::GVFlags getDecodedGVSummaryFlags(uint64_t RawFlags,
auto Linkage = GlobalValue::LinkageTypes(RawFlags & 0xF); // 4 bits
RawFlags = RawFlags >> 4;
bool NotEligibleToImport = (RawFlags & 0x1) || Version < 3;
// The LiveRoot flag wasn't introduced until version 3. For dead stripping
// The Live flag wasn't introduced until version 3. For dead stripping
// to work correctly on earlier versions, we must conservatively treat all
// values as live.
bool LiveRoot = (RawFlags & 0x2) || Version < 3;
return GlobalValueSummary::GVFlags(Linkage, NotEligibleToImport, LiveRoot);
bool Live = (RawFlags & 0x2) || Version < 3;
return GlobalValueSummary::GVFlags(Linkage, NotEligibleToImport, Live);
}
static GlobalValue::VisibilityTypes getDecodedVisibility(unsigned Val) {