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PR19598: Provide the ability to RAUW a declaration with itself, creating a non-temporary copy and using that to RAUW.

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Also, provide the ability to create temporary and non-temporary
declarations, as not all declarations may be replaced by definitions
later on.

This provides the necessary infrastructure for Clang to fix PR19598,
leaking temporary MDNodes in Clang's debug info generation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie
2014-05-06 03:41:57 +00:00
parent 5c34f99911
commit 40a1b74db6
4 changed files with 61 additions and 22 deletions
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34
lib/IR/DIBuilder.cpp
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@@ -901,6 +901,40 @@ DIBuilder::createForwardDecl(unsigned Tag, StringRef Name, DIDescriptor Scope,
UniqueIdentifier.empty() ? nullptr
: MDString::get(VMContext, UniqueIdentifier)
};
MDNode *Node = MDNode::get(VMContext, Elts);
DICompositeType RetTy(Node);
assert(RetTy.isCompositeType() &&
"createForwardDecl result should be a DIType");
if (!UniqueIdentifier.empty())
retainType(RetTy);
return RetTy;
}
/// createForwardDecl - Create a temporary forward-declared type that
/// can be RAUW'd if the full type is seen.
DICompositeType DIBuilder::createReplaceableForwardDecl(
unsigned Tag, StringRef Name, DIDescriptor Scope, DIFile F, unsigned Line,
unsigned RuntimeLang, uint64_t SizeInBits, uint64_t AlignInBits,
StringRef UniqueIdentifier) {
// Create a temporary MDNode.
Value *Elts[] = {
GetTagConstant(VMContext, Tag),
F.getFileNode(),
DIScope(getNonCompileUnitScope(Scope)).getRef(),
MDString::get(VMContext, Name),
ConstantInt::get(Type::getInt32Ty(VMContext), Line),
ConstantInt::get(Type::getInt64Ty(VMContext), SizeInBits),
ConstantInt::get(Type::getInt64Ty(VMContext), AlignInBits),
ConstantInt::get(Type::getInt32Ty(VMContext), 0), // Offset
ConstantInt::get(Type::getInt32Ty(VMContext), DIDescriptor::FlagFwdDecl),
nullptr,
DIArray(),
ConstantInt::get(Type::getInt32Ty(VMContext), RuntimeLang),
nullptr,
nullptr, //TemplateParams
UniqueIdentifier.empty() ? nullptr
: MDString::get(VMContext, UniqueIdentifier)
};
MDNode *Node = MDNode::getTemporary(VMContext, Elts);
DICompositeType RetTy(Node);
assert(RetTy.isCompositeType() &&