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Debug Info: Rename DITypeRef to DIScopeRef.

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A reference to a scope is more general than a reference to a type since
DIType is a subclass of DIScope.

A reference to a type can be either an identifier for the type or
the DIType itself, while a reference to a scope can be either an
identifier for the type (when the scope is indeed a type) or the
DIScope itself. A reference to a type and a reference to a scope
will be resolved in the same way. The only difference is in the
verifier when a field is a reference to a type (i.e. the containing
type field of a DICompositeType) or a field is a reference to a scope
(i.e. the context field of a DIType).

This is to get ready for switching DIType::getContext to return
DIScopeRef instead of DIScope.

Tighten up isTypeRef and isScopeRef to make sure the identifier is not
empty and the MDNode is DIType for TypeRef and DIScope for ScopeRef.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190322 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Manman Ren
2013-09-09 19:03:51 +00:00
parent 626a4b785b
commit c573305bce
4 changed files with 65 additions and 60 deletions
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63
include/llvm/DebugInfo.h
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@@ -46,7 +46,7 @@ namespace llvm {
class DILexicalBlockFile;
class DIVariable;
class DIType;
class DITypeRef;
class DIScopeRef;
class DIObjCProperty;
/// Maps from type identifier to the actual MDNode.
@@ -56,9 +56,9 @@ namespace llvm {
/// This should not be stored in a container, because the underlying MDNode
/// may change in certain situations.
class DIDescriptor {
// Befriends DITypeRef so DITypeRef can befriend the protected member
// function: getFieldAs<DITypeRef>.
friend class DITypeRef;
// Befriends DIScopeRef so DIScopeRef can befriend the protected member
// function: getFieldAs<DIScopeRef>.
friend class DIScopeRef;
public:
enum {
FlagPrivate = 1 << 0,
@@ -151,9 +151,9 @@ namespace llvm {
void dump() const;
};
/// Specialize getFieldAs to handle fields that are references to DITypes.
/// npecialize getFieldAs to handle fields that are references to DIScopes.
template <>
DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
/// DISubrange - This is used to represent ranges, for array bounds.
class DISubrange : public DIDescriptor {
@@ -205,6 +205,25 @@ namespace llvm {
DIScope getContext() const;
StringRef getFilename() const;
StringRef getDirectory() const;
/// Generate a reference to this DIScope. Uses the type identifier instead
/// of the actual MDNode if possible, to help type uniquing.
Value *generateRef();
};
/// Represents reference to a DIScope, abstracts over direct and
/// identifier-based metadata scope references.
class DIScopeRef {
template <typename DescTy>
friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
/// Val can be either a MDNode or a MDString, in the latter,
/// MDString specifies the type identifier.
const Value *Val;
explicit DIScopeRef(const Value *V);
public:
DIScope resolve(const DITypeIdentifierMap &Map) const;
operator Value *() const { return const_cast<Value*>(Val); }
};
/// DIType - This is a wrapper for a type.
@@ -271,32 +290,12 @@ namespace llvm {
/// isUnsignedDIType - Return true if type encoding is unsigned.
bool isUnsignedDIType();
/// Generate a reference to this DIType. Uses the type identifier instead
/// of the actual MDNode if possible, to help type uniquing.
DITypeRef generateRef();
/// replaceAllUsesWith - Replace all uses of debug info referenced by
/// this descriptor.
void replaceAllUsesWith(DIDescriptor &D);
void replaceAllUsesWith(MDNode *D);
};
/// Represents reference to a DIType, abstracts over direct and
/// identifier-based metadata type references.
class DITypeRef {
template <typename DescTy>
friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
friend DITypeRef DIType::generateRef();
/// TypeVal can be either a MDNode or a MDString, in the latter,
/// MDString specifies the type identifier.
const Value *TypeVal;
explicit DITypeRef(const Value *V);
public:
DIType resolve(const DITypeIdentifierMap &Map) const;
operator Value *() const { return const_cast<Value*>(TypeVal); }
};
/// DIBasicType - A basic type, like 'int' or 'float'.
class DIBasicType : public DIType {
public:
@@ -328,9 +327,9 @@ namespace llvm {
/// associated with one.
MDNode *getObjCProperty() const;
DITypeRef getClassType() const {
DIScopeRef getClassType() const {
assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
return getFieldAs<DITypeRef>(10);
return getFieldAs<DIScopeRef>(10);
}
Constant *getConstant() const {
@@ -358,8 +357,8 @@ namespace llvm {
void setTypeArray(DIArray Elements, DIArray TParams = DIArray());
void addMember(DIDescriptor D);
unsigned getRunTimeLang() const { return getUnsignedField(11); }
DITypeRef getContainingType() const {
return getFieldAs<DITypeRef>(12);
DIScopeRef getContainingType() const {
return getFieldAs<DIScopeRef>(12);
}
void setContainingType(DICompositeType ContainingType);
DIArray getTemplateParams() const { return getFieldAs<DIArray>(13); }
@@ -426,8 +425,8 @@ namespace llvm {
unsigned getVirtuality() const { return getUnsignedField(10); }
unsigned getVirtualIndex() const { return getUnsignedField(11); }
DITypeRef getContainingType() const {
return getFieldAs<DITypeRef>(12);
DIScopeRef getContainingType() const {
return getFieldAs<DIScopeRef>(12);
}
unsigned getFlags() const {