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Use separate named MDNode to hold each function's local variable info.

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This speeds up local variable handling in DwarfDebug.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106075 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2010-06-16 00:53:55 +00:00
parent 7500e06e38
commit 2f7d5291de
4 changed files with 17 additions and 4 deletions
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8
lib/Analysis/DebugInfo.cpp
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@ -1053,8 +1053,12 @@ DIVariable DIFactory::CreateVariable(unsigned Tag, DIDescriptor Context,
// The optimizer may remove local variable. If there is an interest
// to preserve variable info in such situation then stash it in a
// named mdnode.
NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.lv");
NMD->addOperand(Node);
DISubprogram Fn(getDISubprogram(Context));
const Twine FnLVName = Twine("llvm.dbg.lv.", Fn.getName());
NamedMDNode *FnLocals = M.getNamedMetadataUsingTwine(FnLVName);
if (!FnLocals)
FnLocals = NamedMDNode::Create(VMContext, FnLVName, NULL, 0, &M);
FnLocals->addOperand(Node);
}
return DIVariable(Node);
}