From 0515fb8d4b2dbfce4fc960abb08a8d9d2f48fe2b Mon Sep 17 00:00:00 2001 From: Teresa Johnson Date: Thu, 3 Nov 2016 01:07:16 +0000 Subject: [ThinLTO] Handle distributed backend case when doing renaming Summary: The recent change I made to consult the summary when deciding whether to rename (to handle inline asm) in r285513 broke the distributed build case. In a distributed backend we will only have a portion of the combined index, specifically for imported modules we only have the summaries for any imported definitions. When renaming on import we were asserting because no summary entry was found for a local reference being linked in (def wasn't imported). We only need to consult the summary for a renaming decision for the exporting module. For imports, we would have prevented importing any references to NoRename values already. Reviewers: mehdi_amini Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D26250 llvm-svn: 285871 --- llvm/lib/Transforms/Utils/FunctionImportUtils.cpp | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) (limited to 'llvm/lib/Transforms') diff --git a/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp b/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp index b9b3606ecfb..d1710feba9d 100644 --- a/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp +++ b/llvm/lib/Transforms/Utils/FunctionImportUtils.cpp @@ -67,10 +67,25 @@ bool FunctionImportGlobalProcessing::shouldPromoteLocalToGlobal( if (GVar && GVar->isConstant() && GVar->hasGlobalUnnamedAddr()) return false; - auto *Summary = ImportIndex.getGlobalValueSummary(SGV->getGUID()); - assert(Summary && "Missing summary for global value"); - if (Summary->noRename()) - return false; + // If we are exporting, we need to see whether this value is marked + // as NoRename in the summary. If we are importing, we may not have + // a summary in the distributed backend case (only summaries for values + // importes as defs, not references, are included in the index passed + // to the distributed backends). + auto Summaries = ImportIndex.findGlobalValueSummaryList(SGV->getGUID()); + if (Summaries == ImportIndex.end()) + // Assert that this is an import - we should always have access to the + // summary when exporting. + assert(isPerformingImport() && + "Missing summary for global value when exporting"); + else { + assert(Summaries->second.size() == 1 && "Local has more than one summary"); + if (Summaries->second.front()->noRename()) { + assert((isModuleExporting() || !GlobalsToImport->count(SGV)) && + "Imported a non-renamable local value"); + return false; + } + } // Eventually we only need to promote functions in the exporting module that // are referenced by a potentially exported function (i.e. one that is in the -- cgit v1.2.3