X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=include%2Fllvm%2FDebugInfo.h;h=d5d235c0a76c5de54e1e4adb3f4238d5ad32ec42;hp=cd4777d7d6d071aab9b052675174e3619f107f7e;hb=341ea7ddf6b09d77bfe3c65664773b683386156c;hpb=2b53089bd017139f0125b870ace94ff27dffd2ff

diff --git a/include/llvm/DebugInfo.h b/include/llvm/DebugInfo.h
index cd4777d7d6d..d5d235c0a76 100644
--- a/include/llvm/DebugInfo.h
+++ b/include/llvm/DebugInfo.h
@@ -17,854 +17,884 @@
 #ifndef LLVM_DEBUGINFO_H
 #define LLVM_DEBUGINFO_H
 
-#include "llvm/Support/Casting.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/IR/Metadata.h"
+#include "llvm/Support/Casting.h"
 #include "llvm/Support/Dwarf.h"
 
 namespace llvm {
-  class BasicBlock;
-  class Constant;
-  class Function;
-  class GlobalVariable;
-  class Module;
-  class Type;
-  class Value;
-  class DbgDeclareInst;
-  class DbgValueInst;
-  class Instruction;
-  class MDNode;
-  class MDString;
-  class NamedMDNode;
-  class LLVMContext;
-  class raw_ostream;
-
-  class DIFile;
-  class DISubprogram;
-  class DILexicalBlock;
-  class DILexicalBlockFile;
-  class DIVariable;
-  class DIType;
-  class DIScope;
-  class DIObjCProperty;
-
-  /// Maps from type identifier to the actual MDNode.
-  typedef DenseMap<const MDString *, MDNode*> DITypeIdentifierMap;
-
-  /// DIDescriptor - A thin wraper around MDNode to access encoded debug info.
-  /// This should not be stored in a container, because the underlying MDNode
-  /// may change in certain situations.
-  class DIDescriptor {
-    // Befriends DIRef so DIRef can befriend the protected member
-    // function: getFieldAs<DIRef>.
-    template <typename T>
-    friend class DIRef;
-  public:
-    enum {
-      FlagPrivate            = 1 << 0,
-      FlagProtected          = 1 << 1,
-      FlagFwdDecl            = 1 << 2,
-      FlagAppleBlock         = 1 << 3,
-      FlagBlockByrefStruct   = 1 << 4,
-      FlagVirtual            = 1 << 5,
-      FlagArtificial         = 1 << 6,
-      FlagExplicit           = 1 << 7,
-      FlagPrototyped         = 1 << 8,
-      FlagObjcClassComplete  = 1 << 9,
-      FlagObjectPointer      = 1 << 10,
-      FlagVector             = 1 << 11,
-      FlagStaticMember       = 1 << 12,
-      FlagIndirectVariable   = 1 << 13
-    };
-  protected:
-    const MDNode *DbgNode;
-
-    StringRef getStringField(unsigned Elt) const;
-    unsigned getUnsignedField(unsigned Elt) const {
-      return (unsigned)getUInt64Field(Elt);
-    }
-    uint64_t getUInt64Field(unsigned Elt) const;
-    int64_t getInt64Field(unsigned Elt) const;
-    DIDescriptor getDescriptorField(unsigned Elt) const;
-
-    template <typename DescTy>
-    DescTy getFieldAs(unsigned Elt) const {
-      return DescTy(getDescriptorField(Elt));
-    }
-
-    GlobalVariable *getGlobalVariableField(unsigned Elt) const;
-    Constant *getConstantField(unsigned Elt) const;
-    Function *getFunctionField(unsigned Elt) const;
-    void replaceFunctionField(unsigned Elt, Function *F);
-
-  public:
-    explicit DIDescriptor(const MDNode *N = 0) : DbgNode(N) {}
-
-    bool Verify() const;
-
-    operator MDNode *() const { return const_cast<MDNode*>(DbgNode); }
-    MDNode *operator ->() const { return const_cast<MDNode*>(DbgNode); }
-
-    // An explicit operator bool so that we can do testing of DI values
-    // easily.
-    // FIXME: This operator bool isn't actually protecting anything at the
-    // moment due to the conversion operator above making DIDescriptor nodes
-    // implicitly convertable to bool.
-    LLVM_EXPLICIT operator bool() const { return DbgNode != 0; }
-
-    bool operator==(DIDescriptor Other) const {
-      return DbgNode == Other.DbgNode;
-    }
-    bool operator!=(DIDescriptor Other) const {
-      return !operator==(Other);
-    }
-
-    uint16_t getTag() const {
-      return getUnsignedField(0) & ~LLVMDebugVersionMask;
-    }
-
-    bool isDerivedType() const;
-    bool isCompositeType() const;
-    bool isBasicType() const;
-    bool isVariable() const;
-    bool isSubprogram() const;
-    bool isGlobalVariable() const;
-    bool isScope() const;
-    bool isFile() const;
-    bool isCompileUnit() const;
-    bool isNameSpace() const;
-    bool isLexicalBlockFile() const;
-    bool isLexicalBlock() const;
-    bool isSubrange() const;
-    bool isEnumerator() const;
-    bool isType() const;
-    bool isUnspecifiedParameter() const;
-    bool isTemplateTypeParameter() const;
-    bool isTemplateValueParameter() const;
-    bool isObjCProperty() const;
-    bool isImportedEntity() const;
-
-    /// print - print descriptor.
-    void print(raw_ostream &OS) const;
-
-    /// dump - print descriptor to dbgs() with a newline.
-    void dump() const;
-  };
-
-  /// DISubrange - This is used to represent ranges, for array bounds.
-  class DISubrange : public DIDescriptor {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DISubrange(const MDNode *N = 0) : DIDescriptor(N) {}
-
-    int64_t getLo() const { return getInt64Field(1); }
-    int64_t  getCount() const { return getInt64Field(2); }
-    bool Verify() const;
-  };
-
-  /// DIArray - This descriptor holds an array of descriptors.
-  class DIArray : public DIDescriptor {
-  public:
-    explicit DIArray(const MDNode *N = 0) : DIDescriptor(N) {}
-
-    unsigned getNumElements() const;
-    DIDescriptor getElement(unsigned Idx) const {
-      return getDescriptorField(Idx);
-    }
-  };
-
-  /// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
-  /// FIXME: it seems strange that this doesn't have either a reference to the
-  /// type/precision or a file/line pair for location info.
-  class DIEnumerator : public DIDescriptor {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DIEnumerator(const MDNode *N = 0) : DIDescriptor(N) {}
-
-    StringRef getName() const        { return getStringField(1); }
-    int64_t getEnumValue() const      { return getInt64Field(2); }
-    bool Verify() const;
-  };
-
-  template <typename T>
-  class DIRef;
-  typedef DIRef<DIScope> DIScopeRef;
-  typedef DIRef<DIType> DITypeRef;
-
-  /// DIScope - A base class for various scopes.
-  class DIScope : public DIDescriptor {
-  protected:
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DIScope(const MDNode *N = 0) : DIDescriptor (N) {}
-
-    /// Gets the parent scope for this scope node or returns a
-    /// default constructed scope.
-    DIScopeRef getContext() const;
-    /// If the scope node has a name, return that, else return an empty string.
-    StringRef getName() 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.
-    DIScopeRef getRef() const;
-  };
-
-  /// Represents reference to a DIDescriptor, abstracts over direct and
-  /// identifier-based metadata references.
-  template <typename T>
-  class DIRef {
-    template <typename DescTy>
-    friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
-    friend DIScopeRef DIScope::getContext() const;
-    friend DIScopeRef DIScope::getRef() const;
-
-    /// Val can be either a MDNode or a MDString, in the latter,
-    /// MDString specifies the type identifier.
-    const Value *Val;
-    explicit DIRef(const Value *V);
-  public:
-    T resolve(const DITypeIdentifierMap &Map) const {
-      if (!Val)
-        return T();
-
-      if (const MDNode *MD = dyn_cast<MDNode>(Val))
-        return T(MD);
-
-      const MDString *MS = cast<MDString>(Val);
-      // Find the corresponding MDNode.
-      DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
-      assert(Iter != Map.end() && "Identifier not in the type map?");
-      assert(DIDescriptor(Iter->second).isType() &&
-             "MDNode in DITypeIdentifierMap should be a DIType.");
-      return T(Iter->second);
-    }
-    StringRef getName() const {
-      if (!Val)
-        return StringRef();
-
-      if (const MDNode *MD = dyn_cast<MDNode>(Val))
-        return T(MD).getName();
-
-      const MDString *MS = cast<MDString>(Val);
-      return MS->getString();
-    }
-    operator Value *() const { return const_cast<Value*>(Val); }
-  };
-
-  /// Specialize getFieldAs to handle fields that are references to DIScopes.
-  template <>
-  DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
-  /// Specialize DIRef constructor for DIScopeRef.
-  template <>
-  DIRef<DIScope>::DIRef(const Value *V);
-
-  /// Specialize getFieldAs to handle fields that are references to DITypes.
-  template <>
-  DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
-  /// Specialize DIRef constructor for DITypeRef.
-  template <>
-  DIRef<DIType>::DIRef(const Value *V);
-
-  /// DIType - This is a wrapper for a type.
-  /// FIXME: Types should be factored much better so that CV qualifiers and
-  /// others do not require a huge and empty descriptor full of zeros.
-  class DIType : public DIScope {
-  protected:
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-
-  public:
-    DIType(const MDNode *N = 0) : DIScope(N) {}
-
-    /// Verify - Verify that a type descriptor is well formed.
-    bool Verify() const;
-
-    DIScopeRef getContext() const       { return getFieldAs<DIScopeRef>(2); }
-    StringRef getName() const           { return getStringField(3);     }
-    unsigned getLineNumber() const      { return getUnsignedField(4); }
-    uint64_t getSizeInBits() const      { return getUInt64Field(5); }
-    uint64_t getAlignInBits() const     { return getUInt64Field(6); }
-    // FIXME: Offset is only used for DW_TAG_member nodes.  Making every type
-    // carry this is just plain insane.
-    uint64_t getOffsetInBits() const    { return getUInt64Field(7); }
-    unsigned getFlags() const           { return getUnsignedField(8); }
-    bool isPrivate() const {
-      return (getFlags() & FlagPrivate) != 0;
-    }
-    bool isProtected() const {
-      return (getFlags() & FlagProtected) != 0;
-    }
-    bool isForwardDecl() const {
-      return (getFlags() & FlagFwdDecl) != 0;
-    }
-    // isAppleBlock - Return true if this is the Apple Blocks extension.
-    bool isAppleBlockExtension() const {
-      return (getFlags() & FlagAppleBlock) != 0;
-    }
-    bool isBlockByrefStruct() const {
-      return (getFlags() & FlagBlockByrefStruct) != 0;
-    }
-    bool isVirtual() const {
-      return (getFlags() & FlagVirtual) != 0;
-    }
-    bool isArtificial() const {
-      return (getFlags() & FlagArtificial) != 0;
-    }
-    bool isObjectPointer() const {
-      return (getFlags() & FlagObjectPointer) != 0;
-    }
-    bool isObjcClassComplete() const {
-      return (getFlags() & FlagObjcClassComplete) != 0;
-    }
-    bool isVector() const {
-      return (getFlags() & FlagVector) != 0;
-    }
-    bool isStaticMember() const {
-      return (getFlags() & FlagStaticMember) != 0;
-    }
-    bool isValid() const {
-      return DbgNode && isType();
-    }
-
-    /// replaceAllUsesWith - Replace all uses of debug info referenced by
-    /// this descriptor.
-    void replaceAllUsesWith(DIDescriptor &D);
-    void replaceAllUsesWith(MDNode *D);
-  };
-
-  /// DIBasicType - A basic type, like 'int' or 'float'.
-  class DIBasicType : public DIType {
-  public:
-    explicit DIBasicType(const MDNode *N = 0) : DIType(N) {}
-
-    unsigned getEncoding() const { return getUnsignedField(9); }
-
-    /// Verify - Verify that a basic type descriptor is well formed.
-    bool Verify() const;
-  };
-
-  /// DIDerivedType - A simple derived type, like a const qualified type,
-  /// a typedef, a pointer or reference, et cetera.  Or, a data member of
-  /// a class/struct/union.
-  class DIDerivedType : public DIType {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-
-  public:
-    explicit DIDerivedType(const MDNode *N = 0) : DIType(N) {}
-
-    DITypeRef getTypeDerivedFrom() const { return getFieldAs<DITypeRef>(9); }
-
-    /// getObjCProperty - Return property node, if this ivar is
-    /// associated with one.
-    MDNode *getObjCProperty() const;
-
-    DITypeRef getClassType() const {
-      assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
-      return getFieldAs<DITypeRef>(10);
-    }
-
-    Constant *getConstant() const {
-      assert((getTag() == dwarf::DW_TAG_member) && isStaticMember());
-      return getConstantField(10);
-    }
-
-    /// Verify - Verify that a derived type descriptor is well formed.
-    bool Verify() const;
-  };
-
-  /// DICompositeType - This descriptor holds a type that can refer to multiple
-  /// other types, like a function or struct.
-  /// DICompositeType is derived from DIDerivedType because some
-  /// composite types (such as enums) can be derived from basic types
-  // FIXME: Make this derive from DIType directly & just store the
-  // base type in a single DIType field.
-  class DICompositeType : public DIDerivedType {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DICompositeType(const MDNode *N = 0) : DIDerivedType(N) {}
-
-    DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
-    void setTypeArray(DIArray Elements, DIArray TParams = DIArray());
-    void addMember(DIDescriptor D);
-    unsigned getRunTimeLang() const { return getUnsignedField(11); }
-    DITypeRef getContainingType() const {
-      return getFieldAs<DITypeRef>(12);
-    }
-    void setContainingType(DICompositeType ContainingType);
-    DIArray getTemplateParams() const { return getFieldAs<DIArray>(13); }
-    MDString *getIdentifier() const;
-
-    /// Verify - Verify that a composite type descriptor is well formed.
-    bool Verify() const;
-  };
-
-  /// DIFile - This is a wrapper for a file.
-  class DIFile : public DIScope {
-    friend class DIDescriptor;
-  public:
-    explicit DIFile(const MDNode *N = 0) : DIScope(N) {}
-    MDNode *getFileNode() const;
-    bool Verify() const;
-  };
-
-  /// DICompileUnit - A wrapper for a compile unit.
-  class DICompileUnit : public DIScope {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DICompileUnit(const MDNode *N = 0) : DIScope(N) {}
-
-    unsigned getLanguage() const { return getUnsignedField(2); }
-    StringRef getProducer() const { return getStringField(3); }
-
-    bool isOptimized() const { return getUnsignedField(4) != 0; }
-    StringRef getFlags() const { return getStringField(5); }
-    unsigned getRunTimeVersion() const { return getUnsignedField(6); }
-
-    DIArray getEnumTypes() const;
-    DIArray getRetainedTypes() const;
-    DIArray getSubprograms() const;
-    DIArray getGlobalVariables() const;
-    DIArray getImportedEntities() const;
-
-    StringRef getSplitDebugFilename() const { return getStringField(12); }
-
-    /// Verify - Verify that a compile unit is well formed.
-    bool Verify() const;
-  };
-
-  /// DISubprogram - This is a wrapper for a subprogram (e.g. a function).
-  class DISubprogram : public DIScope {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DISubprogram(const MDNode *N = 0) : DIScope(N) {}
-
-    DIScope getContext() const          { return getFieldAs<DIScope>(2); }
-    StringRef getName() const         { return getStringField(3); }
-    StringRef getDisplayName() const  { return getStringField(4); }
-    StringRef getLinkageName() const  { return getStringField(5); }
-    unsigned getLineNumber() const      { return getUnsignedField(6); }
-    DICompositeType getType() const { return getFieldAs<DICompositeType>(7); }
-
-    /// isLocalToUnit - Return true if this subprogram is local to the current
-    /// compile unit, like 'static' in C.
-    unsigned isLocalToUnit() const     { return getUnsignedField(8); }
-    unsigned isDefinition() const      { return getUnsignedField(9); }
-
-    unsigned getVirtuality() const { return getUnsignedField(10); }
-    unsigned getVirtualIndex() const { return getUnsignedField(11); }
-
-    DITypeRef getContainingType() const {
-      return getFieldAs<DITypeRef>(12);
-    }
-
-    unsigned getFlags() const {
-      return getUnsignedField(13);
-    }
-
-    unsigned isArtificial() const    {
-      return (getUnsignedField(13) & FlagArtificial) != 0;
-    }
-    /// isPrivate - Return true if this subprogram has "private"
-    /// access specifier.
-    bool isPrivate() const    {
-      return (getUnsignedField(13) & FlagPrivate) != 0;
-    }
-    /// isProtected - Return true if this subprogram has "protected"
-    /// access specifier.
-    bool isProtected() const    {
-      return (getUnsignedField(13) & FlagProtected) != 0;
-    }
-    /// isExplicit - Return true if this subprogram is marked as explicit.
-    bool isExplicit() const    {
-      return (getUnsignedField(13) & FlagExplicit) != 0;
-    }
-    /// isPrototyped - Return true if this subprogram is prototyped.
-    bool isPrototyped() const    {
-      return (getUnsignedField(13) & FlagPrototyped) != 0;
-    }
-
-    unsigned isOptimized() const;
-
-    /// Verify - Verify that a subprogram descriptor is well formed.
-    bool Verify() const;
-
-    /// describes - Return true if this subprogram provides debugging
-    /// information for the function F.
-    bool describes(const Function *F);
-
-    Function *getFunction() const { return getFunctionField(15); }
-    void replaceFunction(Function *F) { replaceFunctionField(15, F); }
-    DIArray getTemplateParams() const { return getFieldAs<DIArray>(16); }
-    DISubprogram getFunctionDeclaration() const {
-      return getFieldAs<DISubprogram>(17);
-    }
-    MDNode *getVariablesNodes() const;
-    DIArray getVariables() const;
-
-    /// getScopeLineNumber - Get the beginning of the scope of the
-    /// function, not necessarily where the name of the program
-    /// starts.
-    unsigned getScopeLineNumber() const { return getUnsignedField(19); }
-  };
-
-  /// DILexicalBlock - This is a wrapper for a lexical block.
-  class DILexicalBlock : public DIScope {
-  public:
-    explicit DILexicalBlock(const MDNode *N = 0) : DIScope(N) {}
-    DIScope getContext() const       { return getFieldAs<DIScope>(2);      }
-    unsigned getLineNumber() const   { return getUnsignedField(3);         }
-    unsigned getColumnNumber() const { return getUnsignedField(4);         }
-    bool Verify() const;
-  };
-
-  /// DILexicalBlockFile - This is a wrapper for a lexical block with
-  /// a filename change.
-  class DILexicalBlockFile : public DIScope {
-  public:
-    explicit DILexicalBlockFile(const MDNode *N = 0) : DIScope(N) {}
-    DIScope getContext() const {
-      if (getScope().isSubprogram())
-        return getScope();
-      return getScope().getContext();
-    }
-    unsigned getLineNumber() const { return getScope().getLineNumber(); }
-    unsigned getColumnNumber() const { return getScope().getColumnNumber(); }
-    DILexicalBlock getScope() const { return getFieldAs<DILexicalBlock>(2); }
-    bool Verify() const;
-  };
-
-  /// DINameSpace - A wrapper for a C++ style name space.
-  class DINameSpace : public DIScope {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DINameSpace(const MDNode *N = 0) : DIScope(N) {}
-    DIScope getContext() const     { return getFieldAs<DIScope>(2);      }
-    StringRef getName() const      { return getStringField(3);           }
-    unsigned getLineNumber() const { return getUnsignedField(4);         }
-    bool Verify() const;
+class BasicBlock;
+class Constant;
+class Function;
+class GlobalVariable;
+class Module;
+class Type;
+class Value;
+class DbgDeclareInst;
+class DbgValueInst;
+class Instruction;
+class MDNode;
+class MDString;
+class NamedMDNode;
+class LLVMContext;
+class raw_ostream;
+
+class DIFile;
+class DISubprogram;
+class DILexicalBlock;
+class DILexicalBlockFile;
+class DIVariable;
+class DIType;
+class DIScope;
+class DIObjCProperty;
+
+/// Maps from type identifier to the actual MDNode.
+typedef DenseMap<const MDString *, MDNode *> DITypeIdentifierMap;
+
+/// DIDescriptor - A thin wraper around MDNode to access encoded debug info.
+/// This should not be stored in a container, because the underlying MDNode
+/// may change in certain situations.
+class DIDescriptor {
+  // Befriends DIRef so DIRef can befriend the protected member
+  // function: getFieldAs<DIRef>.
+  template <typename T> friend class DIRef;
+
+public:
+  enum {
+    FlagPrivate           = 1 << 0,
+    FlagProtected         = 1 << 1,
+    FlagFwdDecl           = 1 << 2,
+    FlagAppleBlock        = 1 << 3,
+    FlagBlockByrefStruct  = 1 << 4,
+    FlagVirtual           = 1 << 5,
+    FlagArtificial        = 1 << 6,
+    FlagExplicit          = 1 << 7,
+    FlagPrototyped        = 1 << 8,
+    FlagObjcClassComplete = 1 << 9,
+    FlagObjectPointer     = 1 << 10,
+    FlagVector            = 1 << 11,
+    FlagStaticMember      = 1 << 12,
+    FlagIndirectVariable  = 1 << 13,
+    FlagLValueReference   = 1 << 14,
+    FlagRValueReference   = 1 << 15
   };
 
-  /// DITemplateTypeParameter - This is a wrapper for template type parameter.
-  class DITemplateTypeParameter : public DIDescriptor {
-  public:
-    explicit DITemplateTypeParameter(const MDNode *N = 0) : DIDescriptor(N) {}
-
-    DIScope getContext() const       { return getFieldAs<DIScope>(1); }
-    StringRef getName() const        { return getStringField(2); }
-    DIType getType() const           { return getFieldAs<DIType>(3); }
-    StringRef getFilename() const    {
-      return getFieldAs<DIFile>(4).getFilename();
-    }
-    StringRef getDirectory() const   {
-      return getFieldAs<DIFile>(4).getDirectory();
-    }
-    unsigned getLineNumber() const   { return getUnsignedField(5); }
-    unsigned getColumnNumber() const { return getUnsignedField(6); }
-    bool Verify() const;
-  };
-
-  /// DITemplateValueParameter - This is a wrapper for template value parameter.
-  class DITemplateValueParameter : public DIDescriptor {
-  public:
-    explicit DITemplateValueParameter(const MDNode *N = 0) : DIDescriptor(N) {}
-
-    DIScope getContext() const       { return getFieldAs<DIScope>(1); }
-    StringRef getName() const        { return getStringField(2); }
-    DIType getType() const           { return getFieldAs<DIType>(3); }
-    Value *getValue() const;
-    StringRef getFilename() const    {
-      return getFieldAs<DIFile>(5).getFilename();
-    }
-    StringRef getDirectory() const   {
-      return getFieldAs<DIFile>(5).getDirectory();
-    }
-    unsigned getLineNumber() const   { return getUnsignedField(6); }
-    unsigned getColumnNumber() const { return getUnsignedField(7); }
-    bool Verify() const;
-  };
-
-  /// DIGlobalVariable - This is a wrapper for a global variable.
-  class DIGlobalVariable : public DIDescriptor {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DIGlobalVariable(const MDNode *N = 0) : DIDescriptor(N) {}
-
-    DIScope getContext() const          { return getFieldAs<DIScope>(2); }
-    StringRef getName() const         { return getStringField(3); }
-    StringRef getDisplayName() const  { return getStringField(4); }
-    StringRef getLinkageName() const  { return getStringField(5); }
-    StringRef getFilename() const {
-      return getFieldAs<DIFile>(6).getFilename();
-    }
-    StringRef getDirectory() const {
-      return getFieldAs<DIFile>(6).getDirectory();
-
-    }
-
-    unsigned getLineNumber() const      { return getUnsignedField(7); }
-    DIType getType() const              { return getFieldAs<DIType>(8); }
-    unsigned isLocalToUnit() const      { return getUnsignedField(9); }
-    unsigned isDefinition() const       { return getUnsignedField(10); }
-
-    GlobalVariable *getGlobal() const { return getGlobalVariableField(11); }
-    Constant *getConstant() const   { return getConstantField(11); }
-    DIDerivedType getStaticDataMemberDeclaration() const {
-      return getFieldAs<DIDerivedType>(12);
-    }
-
-    /// Verify - Verify that a global variable descriptor is well formed.
-    bool Verify() const;
-  };
-
-  /// DIVariable - This is a wrapper for a variable (e.g. parameter, local,
-  /// global etc).
-  class DIVariable : public DIDescriptor {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DIVariable(const MDNode *N = 0) : DIDescriptor(N) {}
-
-    DIScope getContext() const          { return getFieldAs<DIScope>(1); }
-    StringRef getName() const           { return getStringField(2);     }
-    DIFile getFile() const              { return getFieldAs<DIFile>(3); }
-    unsigned getLineNumber() const      {
-      return (getUnsignedField(4) << 8) >> 8;
-    }
-    unsigned getArgNumber() const       {
-      unsigned L = getUnsignedField(4);
-      return L >> 24;
-    }
-    DIType getType() const              { return getFieldAs<DIType>(5); }
-
-    /// isArtificial - Return true if this variable is marked as "artificial".
-    bool isArtificial() const    {
-      return (getUnsignedField(6) & FlagArtificial) != 0;
-    }
-
-    bool isObjectPointer() const {
-      return (getUnsignedField(6) & FlagObjectPointer) != 0;
-    }
-
-    /// \brief Return true if this variable is represented as a pointer.
-    bool isIndirect() const {
-      return (getUnsignedField(6) & FlagIndirectVariable) != 0;
-    }
-
-    /// getInlinedAt - If this variable is inlined then return inline location.
-    MDNode *getInlinedAt() const;
-
-    /// Verify - Verify that a variable descriptor is well formed.
-    bool Verify() const;
-
-    /// HasComplexAddr - Return true if the variable has a complex address.
-    bool hasComplexAddress() const {
-      return getNumAddrElements() > 0;
-    }
-
-    unsigned getNumAddrElements() const;
-
-    uint64_t getAddrElement(unsigned Idx) const {
-      return getUInt64Field(Idx+8);
-    }
-
-    /// isBlockByrefVariable - Return true if the variable was declared as
-    /// a "__block" variable (Apple Blocks).
-    bool isBlockByrefVariable() const {
-      return getType().isBlockByrefStruct();
-    }
-
-    /// isInlinedFnArgument - Return true if this variable provides debugging
-    /// information for an inlined function arguments.
-    bool isInlinedFnArgument(const Function *CurFn);
-
-    void printExtendedName(raw_ostream &OS) const;
-  };
-
-  /// DILocation - This object holds location information. This object
-  /// is not associated with any DWARF tag.
-  class DILocation : public DIDescriptor {
-  public:
-    explicit DILocation(const MDNode *N) : DIDescriptor(N) { }
-
-    unsigned getLineNumber() const     { return getUnsignedField(0); }
-    unsigned getColumnNumber() const   { return getUnsignedField(1); }
-    DIScope  getScope() const          { return getFieldAs<DIScope>(2); }
-    DILocation getOrigLocation() const { return getFieldAs<DILocation>(3); }
-    StringRef getFilename() const    { return getScope().getFilename(); }
-    StringRef getDirectory() const   { return getScope().getDirectory(); }
-    bool Verify() const;
-  };
-
-  class DIObjCProperty : public DIDescriptor {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DIObjCProperty(const MDNode *N) : DIDescriptor(N) { }
-
-    StringRef getObjCPropertyName() const { return getStringField(1); }
-    DIFile getFile() const { return getFieldAs<DIFile>(2); }
-    unsigned getLineNumber() const { return getUnsignedField(3); }
-
-    StringRef getObjCPropertyGetterName() const {
-      return getStringField(4);
-    }
-    StringRef getObjCPropertySetterName() const {
-      return getStringField(5);
-    }
-    bool isReadOnlyObjCProperty() const {
-      return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_readonly) != 0;
-    }
-    bool isReadWriteObjCProperty() const {
-      return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_readwrite) != 0;
-    }
-    bool isAssignObjCProperty() const {
-      return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_assign) != 0;
-    }
-    bool isRetainObjCProperty() const {
-      return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_retain) != 0;
-    }
-    bool isCopyObjCProperty() const {
-      return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_copy) != 0;
-    }
-    bool isNonAtomicObjCProperty() const {
-      return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_nonatomic) != 0;
-    }
-
-    DIType getType() const { return getFieldAs<DIType>(7); }
-
-    /// Verify - Verify that a derived type descriptor is well formed.
-    bool Verify() const;
-  };
-
-  /// \brief An imported module (C++ using directive or similar).
-  class DIImportedEntity : public DIDescriptor {
-    friend class DIDescriptor;
-    void printInternal(raw_ostream &OS) const;
-  public:
-    explicit DIImportedEntity(const MDNode *N) : DIDescriptor(N) { }
-    DIScope getContext() const { return getFieldAs<DIScope>(1); }
-    DIDescriptor getEntity() const { return getFieldAs<DIDescriptor>(2); }
-    unsigned getLineNumber() const { return getUnsignedField(3); }
-    StringRef getName() const { return getStringField(4); }
-    bool Verify() const;
-  };
-
-  /// getDISubprogram - Find subprogram that is enclosing this scope.
-  DISubprogram getDISubprogram(const MDNode *Scope);
-
-  /// getDICompositeType - Find underlying composite type.
-  DICompositeType getDICompositeType(DIType T);
-
-  /// getOrInsertFnSpecificMDNode - Return a NameMDNode that is suitable
-  /// to hold function specific information.
-  NamedMDNode *getOrInsertFnSpecificMDNode(Module &M, DISubprogram SP);
-
-  /// getFnSpecificMDNode - Return a NameMDNode, if available, that is
-  /// suitable to hold function specific information.
-  NamedMDNode *getFnSpecificMDNode(const Module &M, DISubprogram SP);
-
-  /// createInlinedVariable - Create a new inlined variable based on current
-  /// variable.
-  /// @param DV            Current Variable.
-  /// @param InlinedScope  Location at current variable is inlined.
-  DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
-                                   LLVMContext &VMContext);
-
-  /// cleanseInlinedVariable - Remove inlined scope from the variable.
-  DIVariable cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext);
-
-  /// Construct DITypeIdentifierMap by going through retained types of each CU.
-  DITypeIdentifierMap generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes);
-
-  /// DebugInfoFinder tries to list all debug info MDNodes used in a module. To
-  /// list debug info MDNodes used by an instruction, DebugInfoFinder uses
-  /// processDeclare, processValue and processLocation to handle DbgDeclareInst,
-  /// DbgValueInst and DbgLoc attached to instructions. processModule will go
-  /// through all DICompileUnits in llvm.dbg.cu and list debug info MDNodes
-  /// used by the CUs.
-  class DebugInfoFinder {
-  public:
-    /// processModule - Process entire module and collect debug info
-    /// anchors.
-    void processModule(const Module &M);
-
-    /// processDeclare - Process DbgDeclareInst.
-    void processDeclare(const DbgDeclareInst *DDI);
-    /// Process DbgValueInst.
-    void processValue(const DbgValueInst *DVI);
-    /// processLocation - Process DILocation.
-    void processLocation(DILocation Loc);
-
-    /// Clear all lists.
-    void reset();
-  private:
-    /// processType - Process DIType.
-    void processType(DIType DT);
-
-    /// processLexicalBlock - Process DILexicalBlock.
-    void processLexicalBlock(DILexicalBlock LB);
-
-    /// processSubprogram - Process DISubprogram.
-    void processSubprogram(DISubprogram SP);
-
-    void processScope(DIScope Scope);
-
-    /// addCompileUnit - Add compile unit into CUs.
-    bool addCompileUnit(DICompileUnit CU);
-
-    /// addGlobalVariable - Add global variable into GVs.
-    bool addGlobalVariable(DIGlobalVariable DIG);
-
-    // addSubprogram - Add subprogram into SPs.
-    bool addSubprogram(DISubprogram SP);
-
-    /// addType - Add type into Tys.
-    bool addType(DIType DT);
-
-    bool addScope(DIScope Scope);
-
-  public:
-    typedef SmallVectorImpl<MDNode *>::const_iterator iterator;
-    iterator compile_unit_begin()    const { return CUs.begin(); }
-    iterator compile_unit_end()      const { return CUs.end(); }
-    iterator subprogram_begin()      const { return SPs.begin(); }
-    iterator subprogram_end()        const { return SPs.end(); }
-    iterator global_variable_begin() const { return GVs.begin(); }
-    iterator global_variable_end()   const { return GVs.end(); }
-    iterator type_begin()            const { return TYs.begin(); }
-    iterator type_end()              const { return TYs.end(); }
-    iterator scope_begin()           const { return Scopes.begin(); }
-    iterator scope_end()             const { return Scopes.end(); }
-
-    unsigned compile_unit_count()    const { return CUs.size(); }
-    unsigned global_variable_count() const { return GVs.size(); }
-    unsigned subprogram_count()      const { return SPs.size(); }
-    unsigned type_count()            const { return TYs.size(); }
-    unsigned scope_count()           const { return Scopes.size(); }
-
-  private:
-    SmallVector<MDNode *, 8> CUs;  // Compile Units
-    SmallVector<MDNode *, 8> SPs;  // Subprograms
-    SmallVector<MDNode *, 8> GVs;  // Global Variables;
-    SmallVector<MDNode *, 8> TYs;  // Types
-    SmallVector<MDNode *, 8> Scopes; // Scopes
-    SmallPtrSet<MDNode *, 64> NodesSeen;
-    DITypeIdentifierMap TypeIdentifierMap;
-  };
+protected:
+  const MDNode *DbgNode;
+
+  StringRef getStringField(unsigned Elt) const;
+  unsigned getUnsignedField(unsigned Elt) const {
+    return (unsigned)getUInt64Field(Elt);
+  }
+  uint64_t getUInt64Field(unsigned Elt) const;
+  int64_t getInt64Field(unsigned Elt) const;
+  DIDescriptor getDescriptorField(unsigned Elt) const;
+
+  template <typename DescTy> DescTy getFieldAs(unsigned Elt) const {
+    return DescTy(getDescriptorField(Elt));
+  }
+
+  GlobalVariable *getGlobalVariableField(unsigned Elt) const;
+  Constant *getConstantField(unsigned Elt) const;
+  Function *getFunctionField(unsigned Elt) const;
+  void replaceFunctionField(unsigned Elt, Function *F);
+
+public:
+  explicit DIDescriptor(const MDNode *N = 0) : DbgNode(N) {}
+
+  bool Verify() const;
+
+  operator MDNode *() const { return const_cast<MDNode *>(DbgNode); }
+  MDNode *operator->() const { return const_cast<MDNode *>(DbgNode); }
+
+  // An explicit operator bool so that we can do testing of DI values
+  // easily.
+  // FIXME: This operator bool isn't actually protecting anything at the
+  // moment due to the conversion operator above making DIDescriptor nodes
+  // implicitly convertable to bool.
+  LLVM_EXPLICIT operator bool() const { return DbgNode != 0; }
+
+  bool operator==(DIDescriptor Other) const { return DbgNode == Other.DbgNode; }
+  bool operator!=(DIDescriptor Other) const { return !operator==(Other); }
+
+  uint16_t getTag() const {
+    return getUnsignedField(0) & ~LLVMDebugVersionMask;
+  }
+
+  bool isDerivedType() const;
+  bool isCompositeType() const;
+  bool isBasicType() const;
+  bool isVariable() const;
+  bool isSubprogram() const;
+  bool isGlobalVariable() const;
+  bool isScope() const;
+  bool isFile() const;
+  bool isCompileUnit() const;
+  bool isNameSpace() const;
+  bool isLexicalBlockFile() const;
+  bool isLexicalBlock() const;
+  bool isSubrange() const;
+  bool isEnumerator() const;
+  bool isType() const;
+  bool isUnspecifiedParameter() const;
+  bool isTemplateTypeParameter() const;
+  bool isTemplateValueParameter() const;
+  bool isObjCProperty() const;
+  bool isImportedEntity() const;
+
+  /// print - print descriptor.
+  void print(raw_ostream &OS) const;
+
+  /// dump - print descriptor to dbgs() with a newline.
+  void dump() const;
+};
+
+/// DISubrange - This is used to represent ranges, for array bounds.
+class DISubrange : public DIDescriptor {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DISubrange(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  int64_t getLo() const { return getInt64Field(1); }
+  int64_t getCount() const { return getInt64Field(2); }
+  bool Verify() const;
+};
+
+/// DIArray - This descriptor holds an array of descriptors.
+class DIArray : public DIDescriptor {
+public:
+  explicit DIArray(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  unsigned getNumElements() const;
+  DIDescriptor getElement(unsigned Idx) const {
+    return getDescriptorField(Idx);
+  }
+};
+
+/// DIEnumerator - A wrapper for an enumerator (e.g. X and Y in 'enum {X,Y}').
+/// FIXME: it seems strange that this doesn't have either a reference to the
+/// type/precision or a file/line pair for location info.
+class DIEnumerator : public DIDescriptor {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIEnumerator(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  StringRef getName() const { return getStringField(1); }
+  int64_t getEnumValue() const { return getInt64Field(2); }
+  bool Verify() const;
+};
+
+template <typename T> class DIRef;
+typedef DIRef<DIScope> DIScopeRef;
+typedef DIRef<DIType> DITypeRef;
+
+/// DIScope - A base class for various scopes.
+class DIScope : public DIDescriptor {
+protected:
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIScope(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  /// Gets the parent scope for this scope node or returns a
+  /// default constructed scope.
+  DIScopeRef getContext() const;
+  /// If the scope node has a name, return that, else return an empty string.
+  StringRef getName() 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.
+  DIScopeRef getRef() const;
+};
+
+/// Represents reference to a DIDescriptor, abstracts over direct and
+/// identifier-based metadata references.
+template <typename T> class DIRef {
+  template <typename DescTy>
+  friend DescTy DIDescriptor::getFieldAs(unsigned Elt) const;
+  friend DIScopeRef DIScope::getContext() const;
+  friend DIScopeRef DIScope::getRef() const;
+
+  /// Val can be either a MDNode or a MDString, in the latter,
+  /// MDString specifies the type identifier.
+  const Value *Val;
+  explicit DIRef(const Value *V);
+
+public:
+  T resolve(const DITypeIdentifierMap &Map) const;
+  StringRef getName() const;
+  operator Value *() const { return const_cast<Value *>(Val); }
+};
+
+template <typename T>
+T DIRef<T>::resolve(const DITypeIdentifierMap &Map) const {
+  if (!Val)
+    return T();
+
+  if (const MDNode *MD = dyn_cast<MDNode>(Val))
+    return T(MD);
+
+  const MDString *MS = cast<MDString>(Val);
+  // Find the corresponding MDNode.
+  DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
+  assert(Iter != Map.end() && "Identifier not in the type map?");
+  assert(DIDescriptor(Iter->second).isType() &&
+         "MDNode in DITypeIdentifierMap should be a DIType.");
+  return T(Iter->second);
+}
+
+template <typename T> StringRef DIRef<T>::getName() const {
+  if (!Val)
+    return StringRef();
+
+  if (const MDNode *MD = dyn_cast<MDNode>(Val))
+    return T(MD).getName();
+
+  const MDString *MS = cast<MDString>(Val);
+  return MS->getString();
+}
+
+/// Specialize getFieldAs to handle fields that are references to DIScopes.
+template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
+/// Specialize DIRef constructor for DIScopeRef.
+template <> DIRef<DIScope>::DIRef(const Value *V);
+
+/// Specialize getFieldAs to handle fields that are references to DITypes.
+template <> DITypeRef DIDescriptor::getFieldAs<DITypeRef>(unsigned Elt) const;
+/// Specialize DIRef constructor for DITypeRef.
+template <> DIRef<DIType>::DIRef(const Value *V);
+
+/// DIType - This is a wrapper for a type.
+/// FIXME: Types should be factored much better so that CV qualifiers and
+/// others do not require a huge and empty descriptor full of zeros.
+class DIType : public DIScope {
+protected:
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIType(const MDNode *N = 0) : DIScope(N) {}
+
+  /// Verify - Verify that a type descriptor is well formed.
+  bool Verify() const;
+
+  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
+  StringRef getName() const { return getStringField(3); }
+  unsigned getLineNumber() const { return getUnsignedField(4); }
+  uint64_t getSizeInBits() const { return getUInt64Field(5); }
+  uint64_t getAlignInBits() const { return getUInt64Field(6); }
+  // FIXME: Offset is only used for DW_TAG_member nodes.  Making every type
+  // carry this is just plain insane.
+  uint64_t getOffsetInBits() const { return getUInt64Field(7); }
+  unsigned getFlags() const { return getUnsignedField(8); }
+  bool isPrivate() const { return (getFlags() & FlagPrivate) != 0; }
+  bool isProtected() const { return (getFlags() & FlagProtected) != 0; }
+  bool isForwardDecl() const { return (getFlags() & FlagFwdDecl) != 0; }
+  // isAppleBlock - Return true if this is the Apple Blocks extension.
+  bool isAppleBlockExtension() const {
+    return (getFlags() & FlagAppleBlock) != 0;
+  }
+  bool isBlockByrefStruct() const {
+    return (getFlags() & FlagBlockByrefStruct) != 0;
+  }
+  bool isVirtual() const { return (getFlags() & FlagVirtual) != 0; }
+  bool isArtificial() const { return (getFlags() & FlagArtificial) != 0; }
+  bool isObjectPointer() const { return (getFlags() & FlagObjectPointer) != 0; }
+  bool isObjcClassComplete() const {
+    return (getFlags() & FlagObjcClassComplete) != 0;
+  }
+  bool isVector() const { return (getFlags() & FlagVector) != 0; }
+  bool isStaticMember() const { return (getFlags() & FlagStaticMember) != 0; }
+  bool isLValueReference() const {
+    return (getFlags() & FlagLValueReference) != 0;
+  }
+  bool isRValueReference() const {
+    return (getFlags() & FlagRValueReference) != 0;
+  }
+  bool isValid() const { return DbgNode && isType(); }
+
+  /// replaceAllUsesWith - Replace all uses of debug info referenced by
+  /// this descriptor.
+  void replaceAllUsesWith(DIDescriptor &D);
+  void replaceAllUsesWith(MDNode *D);
+};
+
+/// DIBasicType - A basic type, like 'int' or 'float'.
+class DIBasicType : public DIType {
+public:
+  explicit DIBasicType(const MDNode *N = 0) : DIType(N) {}
+
+  unsigned getEncoding() const { return getUnsignedField(9); }
+
+  /// Verify - Verify that a basic type descriptor is well formed.
+  bool Verify() const;
+};
+
+/// DIDerivedType - A simple derived type, like a const qualified type,
+/// a typedef, a pointer or reference, et cetera.  Or, a data member of
+/// a class/struct/union.
+class DIDerivedType : public DIType {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIDerivedType(const MDNode *N = 0) : DIType(N) {}
+
+  DITypeRef getTypeDerivedFrom() const { return getFieldAs<DITypeRef>(9); }
+
+  /// getObjCProperty - Return property node, if this ivar is
+  /// associated with one.
+  MDNode *getObjCProperty() const;
+
+  DITypeRef getClassType() const {
+    assert(getTag() == dwarf::DW_TAG_ptr_to_member_type);
+    return getFieldAs<DITypeRef>(10);
+  }
+
+  Constant *getConstant() const {
+    assert((getTag() == dwarf::DW_TAG_member) && isStaticMember());
+    return getConstantField(10);
+  }
+
+  /// Verify - Verify that a derived type descriptor is well formed.
+  bool Verify() const;
+};
+
+/// DICompositeType - This descriptor holds a type that can refer to multiple
+/// other types, like a function or struct.
+/// DICompositeType is derived from DIDerivedType because some
+/// composite types (such as enums) can be derived from basic types
+// FIXME: Make this derive from DIType directly & just store the
+// base type in a single DIType field.
+class DICompositeType : public DIDerivedType {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DICompositeType(const MDNode *N = 0) : DIDerivedType(N) {}
+
+  DIArray getTypeArray() const { return getFieldAs<DIArray>(10); }
+  void setTypeArray(DIArray Elements, DIArray TParams = DIArray());
+  unsigned getRunTimeLang() const { return getUnsignedField(11); }
+  DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(12); }
+  void setContainingType(DICompositeType ContainingType);
+  DIArray getTemplateParams() const { return getFieldAs<DIArray>(13); }
+  MDString *getIdentifier() const;
+
+  /// Verify - Verify that a composite type descriptor is well formed.
+  bool Verify() const;
+};
+
+/// DIFile - This is a wrapper for a file.
+class DIFile : public DIScope {
+  friend class DIDescriptor;
+
+public:
+  explicit DIFile(const MDNode *N = 0) : DIScope(N) {}
+  MDNode *getFileNode() const;
+  bool Verify() const;
+};
+
+/// DICompileUnit - A wrapper for a compile unit.
+class DICompileUnit : public DIScope {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DICompileUnit(const MDNode *N = 0) : DIScope(N) {}
+
+  unsigned getLanguage() const { return getUnsignedField(2); }
+  StringRef getProducer() const { return getStringField(3); }
+
+  bool isOptimized() const { return getUnsignedField(4) != 0; }
+  StringRef getFlags() const { return getStringField(5); }
+  unsigned getRunTimeVersion() const { return getUnsignedField(6); }
+
+  DIArray getEnumTypes() const;
+  DIArray getRetainedTypes() const;
+  DIArray getSubprograms() const;
+  DIArray getGlobalVariables() const;
+  DIArray getImportedEntities() const;
+
+  StringRef getSplitDebugFilename() const { return getStringField(12); }
+  unsigned getEmissionKind() const { return getUnsignedField(13); }
+
+  /// Verify - Verify that a compile unit is well formed.
+  bool Verify() const;
+};
+
+/// DISubprogram - This is a wrapper for a subprogram (e.g. a function).
+class DISubprogram : public DIScope {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DISubprogram(const MDNode *N = 0) : DIScope(N) {}
+
+  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(2); }
+  StringRef getName() const { return getStringField(3); }
+  StringRef getDisplayName() const { return getStringField(4); }
+  StringRef getLinkageName() const { return getStringField(5); }
+  unsigned getLineNumber() const { return getUnsignedField(6); }
+  DICompositeType getType() const { return getFieldAs<DICompositeType>(7); }
+
+  /// isLocalToUnit - Return true if this subprogram is local to the current
+  /// compile unit, like 'static' in C.
+  unsigned isLocalToUnit() const { return getUnsignedField(8); }
+  unsigned isDefinition() const { return getUnsignedField(9); }
+
+  unsigned getVirtuality() const { return getUnsignedField(10); }
+  unsigned getVirtualIndex() const { return getUnsignedField(11); }
+
+  DITypeRef getContainingType() const { return getFieldAs<DITypeRef>(12); }
+
+  unsigned getFlags() const { return getUnsignedField(13); }
+
+  unsigned isArtificial() const {
+    return (getUnsignedField(13) & FlagArtificial) != 0;
+  }
+  /// isPrivate - Return true if this subprogram has "private"
+  /// access specifier.
+  bool isPrivate() const { return (getUnsignedField(13) & FlagPrivate) != 0; }
+  /// isProtected - Return true if this subprogram has "protected"
+  /// access specifier.
+  bool isProtected() const {
+    return (getUnsignedField(13) & FlagProtected) != 0;
+  }
+  /// isExplicit - Return true if this subprogram is marked as explicit.
+  bool isExplicit() const { return (getUnsignedField(13) & FlagExplicit) != 0; }
+  /// isPrototyped - Return true if this subprogram is prototyped.
+  bool isPrototyped() const {
+    return (getUnsignedField(13) & FlagPrototyped) != 0;
+  }
+
+  /// Return true if this subprogram is a C++11 reference-qualified
+  /// non-static member function (void foo() &).
+  unsigned isLValueReference() const {
+    return (getUnsignedField(13) & FlagLValueReference) != 0;
+  }
+
+  /// Return true if this subprogram is a C++11
+  /// rvalue-reference-qualified non-static member function
+  /// (void foo() &&).
+  unsigned isRValueReference() const {
+    return (getUnsignedField(13) & FlagRValueReference) != 0;
+  }
+
+  unsigned isOptimized() const;
+
+  /// Verify - Verify that a subprogram descriptor is well formed.
+  bool Verify() const;
+
+  /// describes - Return true if this subprogram provides debugging
+  /// information for the function F.
+  bool describes(const Function *F);
+
+  Function *getFunction() const { return getFunctionField(15); }
+  void replaceFunction(Function *F) { replaceFunctionField(15, F); }
+  DIArray getTemplateParams() const { return getFieldAs<DIArray>(16); }
+  DISubprogram getFunctionDeclaration() const {
+    return getFieldAs<DISubprogram>(17);
+  }
+  MDNode *getVariablesNodes() const;
+  DIArray getVariables() const;
+
+  /// getScopeLineNumber - Get the beginning of the scope of the
+  /// function, not necessarily where the name of the program
+  /// starts.
+  unsigned getScopeLineNumber() const { return getUnsignedField(19); }
+};
+
+/// DILexicalBlock - This is a wrapper for a lexical block.
+class DILexicalBlock : public DIScope {
+public:
+  explicit DILexicalBlock(const MDNode *N = 0) : DIScope(N) {}
+  DIScope getContext() const { return getFieldAs<DIScope>(2); }
+  unsigned getLineNumber() const { return getUnsignedField(3); }
+  unsigned getColumnNumber() const { return getUnsignedField(4); }
+  unsigned getDiscriminator() const { return getUnsignedField(5); }
+  bool Verify() const;
+};
+
+/// DILexicalBlockFile - This is a wrapper for a lexical block with
+/// a filename change.
+class DILexicalBlockFile : public DIScope {
+public:
+  explicit DILexicalBlockFile(const MDNode *N = 0) : DIScope(N) {}
+  DIScope getContext() const {
+    if (getScope().isSubprogram())
+      return getScope();
+    return getScope().getContext();
+  }
+  unsigned getLineNumber() const { return getScope().getLineNumber(); }
+  unsigned getColumnNumber() const { return getScope().getColumnNumber(); }
+  DILexicalBlock getScope() const { return getFieldAs<DILexicalBlock>(2); }
+  bool Verify() const;
+};
+
+/// DINameSpace - A wrapper for a C++ style name space.
+class DINameSpace : public DIScope {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DINameSpace(const MDNode *N = 0) : DIScope(N) {}
+  DIScope getContext() const { return getFieldAs<DIScope>(2); }
+  StringRef getName() const { return getStringField(3); }
+  unsigned getLineNumber() const { return getUnsignedField(4); }
+  bool Verify() const;
+};
+
+/// DIUnspecifiedParameter - This is a wrapper for unspecified parameters.
+class DIUnspecifiedParameter : public DIDescriptor {
+public:
+  explicit DIUnspecifiedParameter(const MDNode *N = 0) : DIDescriptor(N) {}
+  bool Verify() const;
+};
+
+/// DITemplateTypeParameter - This is a wrapper for template type parameter.
+class DITemplateTypeParameter : public DIDescriptor {
+public:
+  explicit DITemplateTypeParameter(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
+  StringRef getName() const { return getStringField(2); }
+  DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
+  StringRef getFilename() const { return getFieldAs<DIFile>(4).getFilename(); }
+  StringRef getDirectory() const {
+    return getFieldAs<DIFile>(4).getDirectory();
+  }
+  unsigned getLineNumber() const { return getUnsignedField(5); }
+  unsigned getColumnNumber() const { return getUnsignedField(6); }
+  bool Verify() const;
+};
+
+/// DITemplateValueParameter - This is a wrapper for template value parameter.
+class DITemplateValueParameter : public DIDescriptor {
+public:
+  explicit DITemplateValueParameter(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  DIScopeRef getContext() const { return getFieldAs<DIScopeRef>(1); }
+  StringRef getName() const { return getStringField(2); }
+  DITypeRef getType() const { return getFieldAs<DITypeRef>(3); }
+  Value *getValue() const;
+  StringRef getFilename() const { return getFieldAs<DIFile>(5).getFilename(); }
+  StringRef getDirectory() const {
+    return getFieldAs<DIFile>(5).getDirectory();
+  }
+  unsigned getLineNumber() const { return getUnsignedField(6); }
+  unsigned getColumnNumber() const { return getUnsignedField(7); }
+  bool Verify() const;
+};
+
+/// DIGlobalVariable - This is a wrapper for a global variable.
+class DIGlobalVariable : public DIDescriptor {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIGlobalVariable(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  DIScope getContext() const { return getFieldAs<DIScope>(2); }
+  StringRef getName() const { return getStringField(3); }
+  StringRef getDisplayName() const { return getStringField(4); }
+  StringRef getLinkageName() const { return getStringField(5); }
+  StringRef getFilename() const { return getFieldAs<DIFile>(6).getFilename(); }
+  StringRef getDirectory() const {
+    return getFieldAs<DIFile>(6).getDirectory();
+  }
+
+  unsigned getLineNumber() const { return getUnsignedField(7); }
+  DIType getType() const { return getFieldAs<DIType>(8); }
+  unsigned isLocalToUnit() const { return getUnsignedField(9); }
+  unsigned isDefinition() const { return getUnsignedField(10); }
+
+  GlobalVariable *getGlobal() const { return getGlobalVariableField(11); }
+  Constant *getConstant() const { return getConstantField(11); }
+  DIDerivedType getStaticDataMemberDeclaration() const {
+    return getFieldAs<DIDerivedType>(12);
+  }
+
+  /// Verify - Verify that a global variable descriptor is well formed.
+  bool Verify() const;
+};
+
+/// DIVariable - This is a wrapper for a variable (e.g. parameter, local,
+/// global etc).
+class DIVariable : public DIDescriptor {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIVariable(const MDNode *N = 0) : DIDescriptor(N) {}
+
+  DIScope getContext() const { return getFieldAs<DIScope>(1); }
+  StringRef getName() const { return getStringField(2); }
+  DIFile getFile() const { return getFieldAs<DIFile>(3); }
+  unsigned getLineNumber() const { return (getUnsignedField(4) << 8) >> 8; }
+  unsigned getArgNumber() const {
+    unsigned L = getUnsignedField(4);
+    return L >> 24;
+  }
+  DIType getType() const { return getFieldAs<DIType>(5); }
+
+  /// isArtificial - Return true if this variable is marked as "artificial".
+  bool isArtificial() const {
+    return (getUnsignedField(6) & FlagArtificial) != 0;
+  }
+
+  bool isObjectPointer() const {
+    return (getUnsignedField(6) & FlagObjectPointer) != 0;
+  }
+
+  /// \brief Return true if this variable is represented as a pointer.
+  bool isIndirect() const {
+    return (getUnsignedField(6) & FlagIndirectVariable) != 0;
+  }
+
+  /// getInlinedAt - If this variable is inlined then return inline location.
+  MDNode *getInlinedAt() const;
+
+  /// Verify - Verify that a variable descriptor is well formed.
+  bool Verify() const;
+
+  /// HasComplexAddr - Return true if the variable has a complex address.
+  bool hasComplexAddress() const { return getNumAddrElements() > 0; }
+
+  unsigned getNumAddrElements() const;
+
+  uint64_t getAddrElement(unsigned Idx) const {
+    return getUInt64Field(Idx + 8);
+  }
+
+  /// isBlockByrefVariable - Return true if the variable was declared as
+  /// a "__block" variable (Apple Blocks).
+  bool isBlockByrefVariable() const { return getType().isBlockByrefStruct(); }
+
+  /// isInlinedFnArgument - Return true if this variable provides debugging
+  /// information for an inlined function arguments.
+  bool isInlinedFnArgument(const Function *CurFn);
+
+  void printExtendedName(raw_ostream &OS) const;
+};
+
+/// DILocation - This object holds location information. This object
+/// is not associated with any DWARF tag.
+class DILocation : public DIDescriptor {
+public:
+  explicit DILocation(const MDNode *N) : DIDescriptor(N) {}
+
+  unsigned getLineNumber() const { return getUnsignedField(0); }
+  unsigned getColumnNumber() const { return getUnsignedField(1); }
+  DIScope getScope() const { return getFieldAs<DIScope>(2); }
+  DILocation getOrigLocation() const { return getFieldAs<DILocation>(3); }
+  StringRef getFilename() const { return getScope().getFilename(); }
+  StringRef getDirectory() const { return getScope().getDirectory(); }
+  bool Verify() const;
+  bool atSameLineAs(const DILocation &Other) const {
+    return (getLineNumber() == Other.getLineNumber() &&
+            getFilename() == Other.getFilename());
+  }
+  /// getDiscriminator - DWARF discriminators are used to distinguish
+  /// identical file locations for instructions that are on different
+  /// basic blocks. If two instructions are inside the same lexical block
+  /// and are in different basic blocks, we create a new lexical block
+  /// with identical location as the original but with a different
+  /// discriminator value (lib/Transforms/Util/AddDiscriminators.cpp
+  /// for details).
+  unsigned getDiscriminator() const {
+    // Since discriminators are associated with lexical blocks, make
+    // sure this location is a lexical block before retrieving its
+    // value.
+    return getScope().isLexicalBlock()
+               ? getFieldAs<DILexicalBlock>(2).getDiscriminator()
+               : 0;
+  }
+  unsigned computeNewDiscriminator(LLVMContext &Ctx);
+  DILocation copyWithNewScope(LLVMContext &Ctx, DILexicalBlock NewScope);
+};
+
+class DIObjCProperty : public DIDescriptor {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIObjCProperty(const MDNode *N) : DIDescriptor(N) {}
+
+  StringRef getObjCPropertyName() const { return getStringField(1); }
+  DIFile getFile() const { return getFieldAs<DIFile>(2); }
+  unsigned getLineNumber() const { return getUnsignedField(3); }
+
+  StringRef getObjCPropertyGetterName() const { return getStringField(4); }
+  StringRef getObjCPropertySetterName() const { return getStringField(5); }
+  bool isReadOnlyObjCProperty() const {
+    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_readonly) != 0;
+  }
+  bool isReadWriteObjCProperty() const {
+    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_readwrite) != 0;
+  }
+  bool isAssignObjCProperty() const {
+    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_assign) != 0;
+  }
+  bool isRetainObjCProperty() const {
+    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_retain) != 0;
+  }
+  bool isCopyObjCProperty() const {
+    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_copy) != 0;
+  }
+  bool isNonAtomicObjCProperty() const {
+    return (getUnsignedField(6) & dwarf::DW_APPLE_PROPERTY_nonatomic) != 0;
+  }
+
+  DIType getType() const { return getFieldAs<DIType>(7); }
+
+  /// Verify - Verify that a derived type descriptor is well formed.
+  bool Verify() const;
+};
+
+/// \brief An imported module (C++ using directive or similar).
+class DIImportedEntity : public DIDescriptor {
+  friend class DIDescriptor;
+  void printInternal(raw_ostream &OS) const;
+
+public:
+  explicit DIImportedEntity(const MDNode *N) : DIDescriptor(N) {}
+  DIScope getContext() const { return getFieldAs<DIScope>(1); }
+  DIDescriptor getEntity() const { return getFieldAs<DIDescriptor>(2); }
+  unsigned getLineNumber() const { return getUnsignedField(3); }
+  StringRef getName() const { return getStringField(4); }
+  bool Verify() const;
+};
+
+/// getDISubprogram - Find subprogram that is enclosing this scope.
+DISubprogram getDISubprogram(const MDNode *Scope);
+
+/// getDICompositeType - Find underlying composite type.
+DICompositeType getDICompositeType(DIType T);
+
+/// getOrInsertFnSpecificMDNode - Return a NameMDNode that is suitable
+/// to hold function specific information.
+NamedMDNode *getOrInsertFnSpecificMDNode(Module &M, DISubprogram SP);
+
+/// getFnSpecificMDNode - Return a NameMDNode, if available, that is
+/// suitable to hold function specific information.
+NamedMDNode *getFnSpecificMDNode(const Module &M, DISubprogram SP);
+
+/// createInlinedVariable - Create a new inlined variable based on current
+/// variable.
+/// @param DV            Current Variable.
+/// @param InlinedScope  Location at current variable is inlined.
+DIVariable createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
+                                 LLVMContext &VMContext);
+
+/// cleanseInlinedVariable - Remove inlined scope from the variable.
+DIVariable cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext);
+
+/// Construct DITypeIdentifierMap by going through retained types of each CU.
+DITypeIdentifierMap generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes);
+
+/// Strip debug info in the module if it exists.
+/// To do this, we remove all calls to the debugger intrinsics and any named
+/// metadata for debugging. We also remove debug locations for instructions.
+/// Return true if module is modified.
+bool StripDebugInfo(Module &M);
+
+/// Return Debug Info Metadata Version by checking module flags.
+unsigned getDebugMetadataVersionFromModule(const Module &M);
+
+/// DebugInfoFinder tries to list all debug info MDNodes used in a module. To
+/// list debug info MDNodes used by an instruction, DebugInfoFinder uses
+/// processDeclare, processValue and processLocation to handle DbgDeclareInst,
+/// DbgValueInst and DbgLoc attached to instructions. processModule will go
+/// through all DICompileUnits in llvm.dbg.cu and list debug info MDNodes
+/// used by the CUs.
+class DebugInfoFinder {
+public:
+  DebugInfoFinder() : TypeMapInitialized(false) {}
+
+  /// processModule - Process entire module and collect debug info
+  /// anchors.
+  void processModule(const Module &M);
+
+  /// processDeclare - Process DbgDeclareInst.
+  void processDeclare(const Module &M, const DbgDeclareInst *DDI);
+  /// Process DbgValueInst.
+  void processValue(const Module &M, const DbgValueInst *DVI);
+  /// processLocation - Process DILocation.
+  void processLocation(const Module &M, DILocation Loc);
+
+  /// Clear all lists.
+  void reset();
+
+private:
+  /// Initialize TypeIdentifierMap.
+  void InitializeTypeMap(const Module &M);
+
+  /// processType - Process DIType.
+  void processType(DIType DT);
+
+  /// processLexicalBlock - Process DILexicalBlock.
+  void processLexicalBlock(DILexicalBlock LB);
+
+  /// processSubprogram - Process DISubprogram.
+  void processSubprogram(DISubprogram SP);
+
+  void processScope(DIScope Scope);
+
+  /// addCompileUnit - Add compile unit into CUs.
+  bool addCompileUnit(DICompileUnit CU);
+
+  /// addGlobalVariable - Add global variable into GVs.
+  bool addGlobalVariable(DIGlobalVariable DIG);
+
+  // addSubprogram - Add subprogram into SPs.
+  bool addSubprogram(DISubprogram SP);
+
+  /// addType - Add type into Tys.
+  bool addType(DIType DT);
+
+  bool addScope(DIScope Scope);
+
+public:
+  typedef SmallVectorImpl<MDNode *>::const_iterator iterator;
+  iterator compile_unit_begin() const { return CUs.begin(); }
+  iterator compile_unit_end() const { return CUs.end(); }
+  iterator subprogram_begin() const { return SPs.begin(); }
+  iterator subprogram_end() const { return SPs.end(); }
+  iterator global_variable_begin() const { return GVs.begin(); }
+  iterator global_variable_end() const { return GVs.end(); }
+  iterator type_begin() const { return TYs.begin(); }
+  iterator type_end() const { return TYs.end(); }
+  iterator scope_begin() const { return Scopes.begin(); }
+  iterator scope_end() const { return Scopes.end(); }
+
+  unsigned compile_unit_count() const { return CUs.size(); }
+  unsigned global_variable_count() const { return GVs.size(); }
+  unsigned subprogram_count() const { return SPs.size(); }
+  unsigned type_count() const { return TYs.size(); }
+  unsigned scope_count() const { return Scopes.size(); }
+
+private:
+  SmallVector<MDNode *, 8> CUs;    // Compile Units
+  SmallVector<MDNode *, 8> SPs;    // Subprograms
+  SmallVector<MDNode *, 8> GVs;    // Global Variables;
+  SmallVector<MDNode *, 8> TYs;    // Types
+  SmallVector<MDNode *, 8> Scopes; // Scopes
+  SmallPtrSet<MDNode *, 64> NodesSeen;
+  DITypeIdentifierMap TypeIdentifierMap;
+  /// Specify if TypeIdentifierMap is initialized.
+  bool TypeMapInitialized;
+};
 } // end namespace llvm
 
 #endif