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Debug Info: Use identifier to reference DIType in base type field of

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ptr_to_member.

We introduce a new class DITypeRef that represents a reference to a DIType.
It wraps around a Value*, which can be either an identifier in MDString
or an actual MDNode. The class has a helper function "resolve" that
finds the actual MDNode for a given DITypeRef.

We specialize getFieldAs to return a field that is a reference to a
DIType. To correctly access the base type field of ptr_to_member,
getClassType now calls getFieldAs<DITypeRef> to return a DITypeRef.

Also add a typedef for DITypeIdentifierMap and a helper
generateDITypeIdentifierMap in DebugInfo.h. In DwarfDebug.cpp, we keep
a DITypeIdentifierMap and call generateDITypeIdentifierMap to actually
populate the map.

Verifier is updated accordingly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190081 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2013-09-05 18:48:31 +00:00
parent 79916948e1
commit bc66071baa
7 changed files with 156 additions and 6 deletions
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14
lib/IR/DIBuilder.cpp
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@ -75,6 +75,18 @@ void DIBuilder::finalize() {
DIType(TempImportedModules).replaceAllUsesWith(IMs);
}
/// Use the type identifier instead of the actual MDNode if possible,
/// to help type uniquing. This function returns the identifier if it
/// exists for the given type, otherwise returns the MDNode.
static Value *getTypeIdentifier(DIType T) {
if (!T.isCompositeType())
return T;
DICompositeType DTy(T);
if (!DTy.getIdentifier())
return T;
return DTy.getIdentifier();
}
/// getNonCompileUnitScope - If N is compile unit return NULL otherwise return
/// N.
static MDNode *getNonCompileUnitScope(MDNode *N) {
@ -322,7 +334,7 @@ DIDerivedType DIBuilder::createMemberPointerType(DIType PointeeTy,
ConstantInt::get(Type::getInt64Ty(VMContext), 0), // Offset
ConstantInt::get(Type::getInt32Ty(VMContext), 0), // Flags
PointeeTy,
Base
getTypeIdentifier(Base)
};
return DIDerivedType(MDNode::get(VMContext, Elts));
}