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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.

Originally commited as r317374, but reverted in r317395 to update some missed
tests.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317408 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sean Fertile
2017-11-04 17:04:39 +00:00
parent ce4da27234
commit dcf1ffe8a0
28 changed files with 137 additions and 58 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) {