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Decorating vptr load & stores with !invariant.group

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Adding !invariant.group to vptr load/stores for devirtualization purposes.
For more goto:
http://lists.llvm.org/pipermail/cfe-dev/2015-July/044227.html

http://reviews.llvm.org/D12026

llvm-svn: 247725
This commit is contained in:
Piotr Padlewski
2015-09-15 21:46:55 +00:00
parent 9d0ecf27a7
commit 4b1ac72cd4
10 changed files with 144 additions and 28 deletions
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16
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -507,9 +507,9 @@ llvm::MDNode *CodeGenModule::getTBAAStructTagInfo(QualType BaseTy,
/// and struct-path aware TBAA, the tag has the same format:
/// base type, access type and offset.
/// When ConvertTypeToTag is true, we create a tag based on the scalar type.
void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst,
llvm::MDNode *TBAAInfo,
bool ConvertTypeToTag) {
void CodeGenModule::DecorateInstructionWithTBAA(llvm::Instruction *Inst,
llvm::MDNode *TBAAInfo,
bool ConvertTypeToTag) {
if (ConvertTypeToTag && TBAA)
Inst->setMetadata(llvm::LLVMContext::MD_tbaa,
TBAA->getTBAAScalarTagInfo(TBAAInfo));
@@ -517,6 +517,16 @@ void CodeGenModule::DecorateInstruction(llvm::Instruction *Inst,
Inst->setMetadata(llvm::LLVMContext::MD_tbaa, TBAAInfo);
}
void CodeGenModule::DecorateInstructionWithInvariantGroup(
llvm::Instruction *I, const CXXRecordDecl *RD) {
llvm::Metadata *MD = CreateMetadataIdentifierForType(QualType(RD->getTypeForDecl(), 0));
auto *MetaDataNode = dyn_cast<llvm::MDNode>(MD);
// Check if we have to wrap MDString in MDNode.
if (!MetaDataNode)
MetaDataNode = llvm::MDNode::get(getLLVMContext(), MD);
I->setMetadata("invariant.group", MetaDataNode);
}
void CodeGenModule::Error(SourceLocation loc, StringRef message) {
unsigned diagID = getDiags().getCustomDiagID(DiagnosticsEngine::Error, "%0");
getDiags().Report(Context.getFullLoc(loc), diagID) << message;