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[LTO][ThinLTO] Use the linker resolutions to mark global values as dso_local.

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Now that we have a way to mark GlobalValues as local we can use the symbol
resolutions that the linker plugin provides as part of lto/thinlto link
step to refine the compilers view on what symbols will end up being local.

Differential Revision: https://reviews.llvm.org/D35702

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317374 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sean Fertile
2017-11-03 21:45:55 +00:00
parent ce8f24e6d7
commit cdc57825ed
19 changed files with 115 additions and 37 deletions
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4
lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -889,7 +889,9 @@ static GlobalValueSummary::GVFlags getDecodedGVSummaryFlags(uint64_t RawFlags,
// to work correctly on earlier versions, we must conservatively treat all
// values as live.
bool Live = (RawFlags & 0x2) || Version < 3;
return GlobalValueSummary::GVFlags(Linkage, NotEligibleToImport, Live);
bool Local = (RawFlags & 0x4);
return GlobalValueSummary::GVFlags(Linkage, NotEligibleToImport, Live, Local);
}
static GlobalValue::VisibilityTypes getDecodedVisibility(unsigned Val) {