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ThinLTO: Move alias importing decision on the summary 

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 266845
This commit is contained in:
Mehdi Amini 2016-04-20 01:04:20 +00:00
parent f12609c9ed
commit 6968ef773b
1 changed files with 16 additions and 5 deletions
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21
llvm/lib/Transforms/IPO/FunctionImport.cpp
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@ -163,10 +163,20 @@ static void computeImportForFunction(
}
// "Resolve" the summary, traversing alias,
const FunctionSummary *ResolvedCalleeSummary;
if (isa<AliasSummary>(CalleeSummary))
if (isa<AliasSummary>(CalleeSummary)) {
ResolvedCalleeSummary = cast<FunctionSummary>(
&cast<AliasSummary>(CalleeSummary)->getAliasee());
else
if (!GlobalValue::isLinkOnceODRLinkage(
ResolvedCalleeSummary->linkage())) {
// Alias can't point to "available_externally". However when we import
// linkOnceODR the linkage does not change. So we import the alias
// and aliasee only in this case.
// FIXME: we should import alias as available_externally *function*, the
// destination module does need to know it is an alias.
DEBUG(dbgs() << "ignored! Aliasee is not linkonce_odr.\n");
continue;
}
} else
ResolvedCalleeSummary = cast<FunctionSummary>(CalleeSummary);
assert(ResolvedCalleeSummary->instCount() <= Threshold &&
@ -380,10 +390,11 @@ bool FunctionImporter::importFunctions(
if (Import) {
// Alias can't point to "available_externally". However when we import
// linkOnceODR the linkage does not change. So we import the alias
// and aliasee only in this case.
// and aliasee only in this case. This has been handled by
// computeImportForFunction()
GlobalObject *GO = GV.getBaseObject();
if (!GO->hasLinkOnceODRLinkage())
continue;
assert(GO->hasLinkOnceODRLinkage() &&
"Unexpected alias to a non-linkonceODR in import list");
#ifndef NDEBUG
if (!GlobalsToImport.count(GO))
DEBUG(dbgs() << " alias triggers importing aliasee " << GO->getGUID()