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[ThinLTO] Enable importing of aliases as copy of aliasee

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Summary:
This implements a missing feature to allow importing of aliases, which
was previously disabled because alias cannot be available_externally.
We instead import an alias as a copy of its aliasee.

Some additional work was required in the IndexBitcodeWriter for the
distributed build case, to ensure that the aliasee has a value id
in the distributed index file (i.e. even when it is not being
imported directly).

This is a performance win in codes that have many aliases, e.g. C++
applications that have many constructor and destructor aliases.

Reviewers: pcc

Subscribers: mehdi_amini, inglorion, eraman, llvm-commits

Differential Revision: https://reviews.llvm.org/D40747

llvm-svn: 320895
This commit is contained in:
Teresa Johnson
2017-12-16 00:18:12 +00:00
parent c4fdbca604
commit 81bbf74265
14 changed files with 236 additions and 81 deletions
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4
llvm/lib/Bitcode/Reader/BitcodeReader.cpp
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@@ -5202,6 +5202,7 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
if (!AliaseeInModule)
return error("Alias expects aliasee summary to be parsed");
AS->setAliasee(AliaseeInModule);
AS->setAliaseeGUID(AliaseeGUID);
auto GUID = getValueInfoFromValueId(ValueID);
AS->setOriginalName(GUID.second);
@@ -5288,9 +5289,8 @@ Error ModuleSummaryIndexBitcodeReader::parseEntireSummary(unsigned ID) {
getValueInfoFromValueId(AliaseeValueId).first.getGUID();
auto AliaseeInModule =
TheIndex.findSummaryInModule(AliaseeGUID, AS->modulePath());
if (!AliaseeInModule)
return error("Alias expects aliasee summary to be parsed");
AS->setAliasee(AliaseeInModule);
AS->setAliaseeGUID(AliaseeGUID);
ValueInfo VI = getValueInfoFromValueId(ValueID).first;
LastSeenGUID = VI.getGUID();