rename files

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33552 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1696 insertions, 0 deletions

diff --git a/lib/CodeGen/MachineModuleInfo.cpp b/lib/CodeGen/MachineModuleInfo.cpp
new file mode 100644
index 0000000000..065d6cf295
--- /dev/null
+++ b/lib/CodeGen/MachineModuleInfo.cpp
@@ -0,0 +1,1696 @@
+//===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by James M. Laskey and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineModuleInfo.h"
+
+#include "llvm/Constants.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineLocation.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/Instructions.h"
+#include "llvm/Module.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/Streams.h"
+using namespace llvm;
+using namespace llvm::dwarf;
+
+// Handle the Pass registration stuff necessary to use TargetData's.
+namespace {
+  RegisterPass<MachineModuleInfo> X("machinemoduleinfo", "Module Information");
+}
+
+//===----------------------------------------------------------------------===//
+
+/// getGlobalVariablesUsing - Return all of the GlobalVariables which have the
+/// specified value in their initializer somewhere.
+static void
+getGlobalVariablesUsing(Value *V, std::vector<GlobalVariable*> &Result) {
+  // Scan though value users.
+  for (Value::use_iterator I = V->use_begin(), E = V->use_end(); I != E; ++I) {
+    if (GlobalVariable *GV = dyn_cast<GlobalVariable>(*I)) {
+      // If the user is a GlobalVariable then add to result.
+      Result.push_back(GV);
+    } else if (Constant *C = dyn_cast<Constant>(*I)) {
+      // If the user is a constant variable then scan its users
+      getGlobalVariablesUsing(C, Result);
+    }
+  }
+}
+
+/// getGlobalVariablesUsing - Return all of the GlobalVariables that use the
+/// named GlobalVariable.
+static std::vector<GlobalVariable*>
+getGlobalVariablesUsing(Module &M, const std::string &RootName) {
+  std::vector<GlobalVariable*> Result;  // GlobalVariables matching criteria.
+  
+  std::vector<const Type*> FieldTypes;
+  FieldTypes.push_back(Type::Int32Ty);
+  FieldTypes.push_back(Type::Int32Ty);
+
+  // Get the GlobalVariable root.
+  GlobalVariable *UseRoot = M.getGlobalVariable(RootName,
+                                                StructType::get(FieldTypes));
+
+  // If present and linkonce then scan for users.
+  if (UseRoot && UseRoot->hasLinkOnceLinkage()) {
+    getGlobalVariablesUsing(UseRoot, Result);
+  }
+  
+  return Result;
+}
+  
+/// isStringValue - Return true if the given value can be coerced to a string.
+///
+static bool isStringValue(Value *V) {
+  if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
+    if (GV->hasInitializer() && isa<ConstantArray>(GV->getInitializer())) {
+      ConstantArray *Init = cast<ConstantArray>(GV->getInitializer());
+      return Init->isString();
+    }
+  } else if (Constant *C = dyn_cast<Constant>(V)) {
+    if (GlobalValue *GV = dyn_cast<GlobalValue>(C))
+      return isStringValue(GV);
+    else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+      if (CE->getOpcode() == Instruction::GetElementPtr) {
+        if (CE->getNumOperands() == 3 &&
+            cast<Constant>(CE->getOperand(1))->isNullValue() &&
+            isa<ConstantInt>(CE->getOperand(2))) {
+          return isStringValue(CE->getOperand(0));
+        }
+      }
+    }
+  }
+  return false;
+}
+
+/// getGlobalVariable - Return either a direct or cast Global value.
+///
+static GlobalVariable *getGlobalVariable(Value *V) {
+  if (GlobalVariable *GV = dyn_cast<GlobalVariable>(V)) {
+    return GV;
+  } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
+    if (CE->getOpcode() == Instruction::BitCast) {
+      return dyn_cast<GlobalVariable>(CE->getOperand(0));
+    }
+  }
+  return NULL;
+}
+
+/// isGlobalVariable - Return true if the given value can be coerced to a
+/// GlobalVariable.
+static bool isGlobalVariable(Value *V) {
+  if (isa<GlobalVariable>(V) || isa<ConstantPointerNull>(V)) {
+    return true;
+  } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
+    if (CE->getOpcode() == Instruction::BitCast) {
+      return isa<GlobalVariable>(CE->getOperand(0));
+    }
+  }
+  return false;
+}
+
+/// getUIntOperand - Return ith operand if it is an unsigned integer.
+///
+static ConstantInt *getUIntOperand(GlobalVariable *GV, unsigned i) {
+  // Make sure the GlobalVariable has an initializer.
+  if (!GV->hasInitializer()) return NULL;
+  
+  // Get the initializer constant.
+  ConstantStruct *CI = dyn_cast<ConstantStruct>(GV->getInitializer());
+  if (!CI) return NULL;
+  
+  // Check if there is at least i + 1 operands.
+  unsigned N = CI->getNumOperands();
+  if (i >= N) return NULL;
+
+  // Check constant.
+  return dyn_cast<ConstantInt>(CI->getOperand(i));
+}
+
+//===----------------------------------------------------------------------===//
+
+/// ApplyToFields - Target the visitor to each field of the debug information
+/// descriptor.
+void DIVisitor::ApplyToFields(DebugInfoDesc *DD) {
+  DD->ApplyToFields(this);
+}
+
+//===----------------------------------------------------------------------===//
+/// DICountVisitor - This DIVisitor counts all the fields in the supplied debug
+/// the supplied DebugInfoDesc.
+class DICountVisitor : public DIVisitor {
+private:
+  unsigned Count;                       // Running count of fields.
+  
+public:
+  DICountVisitor() : DIVisitor(), Count(0) {}
+  
+  // Accessors.
+  unsigned getCount() const { return Count; }
+  
+  /// Apply - Count each of the fields.
+  ///
+  virtual void Apply(int &Field)             { ++Count; }
+  virtual void Apply(unsigned &Field)        { ++Count; }
+  virtual void Apply(int64_t &Field)         { ++Count; }
+  virtual void Apply(uint64_t &Field)        { ++Count; }
+  virtual void Apply(bool &Field)            { ++Count; }
+  virtual void Apply(std::string &Field)     { ++Count; }
+  virtual void Apply(DebugInfoDesc *&Field)  { ++Count; }
+  virtual void Apply(GlobalVariable *&Field) { ++Count; }
+  virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
+    ++Count;
+  }
+};
+
+//===----------------------------------------------------------------------===//
+/// DIDeserializeVisitor - This DIVisitor deserializes all the fields in the
+/// supplied DebugInfoDesc.
+class DIDeserializeVisitor : public DIVisitor {
+private:
+  DIDeserializer &DR;                   // Active deserializer.
+  unsigned I;                           // Current operand index.
+  ConstantStruct *CI;                   // GlobalVariable constant initializer.
+
+public:
+  DIDeserializeVisitor(DIDeserializer &D, GlobalVariable *GV)
+  : DIVisitor()
+  , DR(D)
+  , I(0)
+  , CI(cast<ConstantStruct>(GV->getInitializer()))
+  {}
+  
+  /// Apply - Set the value of each of the fields.
+  ///
+  virtual void Apply(int &Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = cast<ConstantInt>(C)->getSExtValue();
+  }
+  virtual void Apply(unsigned &Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = cast<ConstantInt>(C)->getZExtValue();
+  }
+  virtual void Apply(int64_t &Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = cast<ConstantInt>(C)->getSExtValue();
+  }
+  virtual void Apply(uint64_t &Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = cast<ConstantInt>(C)->getZExtValue();
+  }
+  virtual void Apply(bool &Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = cast<ConstantInt>(C)->getZExtValue();
+  }
+  virtual void Apply(std::string &Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = C->getStringValue();
+  }
+  virtual void Apply(DebugInfoDesc *&Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = DR.Deserialize(C);
+  }
+  virtual void Apply(GlobalVariable *&Field) {
+    Constant *C = CI->getOperand(I++);
+    Field = getGlobalVariable(C);
+  }
+  virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
+    Field.resize(0);
+    Constant *C = CI->getOperand(I++);
+    GlobalVariable *GV = getGlobalVariable(C);
+    if (GV->hasInitializer()) {
+      if (ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer())) {
+        for (unsigned i = 0, N = CA->getNumOperands(); i < N; ++i) {
+          GlobalVariable *GVE = getGlobalVariable(CA->getOperand(i));
+          DebugInfoDesc *DE = DR.Deserialize(GVE);
+          Field.push_back(DE);
+        }
+      } else if (GV->getInitializer()->isNullValue()) {
+        if (const ArrayType *T =
+            dyn_cast<ArrayType>(GV->getType()->getElementType())) {
+          Field.resize(T->getNumElements());
+        }
+      }
+    }
+  }
+};
+
+//===----------------------------------------------------------------------===//
+/// DISerializeVisitor - This DIVisitor serializes all the fields in
+/// the supplied DebugInfoDesc.
+class DISerializeVisitor : public DIVisitor {
+private:
+  DISerializer &SR;                     // Active serializer.
+  std::vector<Constant*> &Elements;     // Element accumulator.
+  
+public:
+  DISerializeVisitor(DISerializer &S, std::vector<Constant*> &E)
+  : DIVisitor()
+  , SR(S)
+  , Elements(E)
+  {}
+  
+  /// Apply - Set the value of each of the fields.
+  ///
+  virtual void Apply(int &Field) {
+    Elements.push_back(ConstantInt::get(Type::Int32Ty, int32_t(Field)));
+  }
+  virtual void Apply(unsigned &Field) {
+    Elements.push_back(ConstantInt::get(Type::Int32Ty, uint32_t(Field)));
+  }
+  virtual void Apply(int64_t &Field) {
+    Elements.push_back(ConstantInt::get(Type::Int64Ty, int64_t(Field)));
+  }
+  virtual void Apply(uint64_t &Field) {
+    Elements.push_back(ConstantInt::get(Type::Int64Ty, uint64_t(Field)));
+  }
+  virtual void Apply(bool &Field) {
+    Elements.push_back(ConstantInt::get(Type::Int1Ty, Field));
+  }
+  virtual void Apply(std::string &Field) {
+      Elements.push_back(SR.getString(Field));
+  }
+  virtual void Apply(DebugInfoDesc *&Field) {
+    GlobalVariable *GV = NULL;
+    
+    // If non-NULL then convert to global.
+    if (Field) GV = SR.Serialize(Field);
+    
+    // FIXME - At some point should use specific type.
+    const PointerType *EmptyTy = SR.getEmptyStructPtrType();
+    
+    if (GV) {
+      // Set to pointer to global.
+      Elements.push_back(ConstantExpr::getBitCast(GV, EmptyTy));
+    } else {
+      // Use NULL.
+      Elements.push_back(ConstantPointerNull::get(EmptyTy));
+    }
+  }
+  virtual void Apply(GlobalVariable *&Field) {
+    const PointerType *EmptyTy = SR.getEmptyStructPtrType();
+    if (Field) {
+      Elements.push_back(ConstantExpr::getBitCast(Field, EmptyTy));
+    } else {
+      Elements.push_back(ConstantPointerNull::get(EmptyTy));
+    }
+  }
+  virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
+    const PointerType *EmptyTy = SR.getEmptyStructPtrType();
+    unsigned N = Field.size();
+    ArrayType *AT = ArrayType::get(EmptyTy, N);
+    std::vector<Constant *> ArrayElements;
+
+    for (unsigned i = 0, N = Field.size(); i < N; ++i) {
+      if (DebugInfoDesc *Element = Field[i]) {
+        GlobalVariable *GVE = SR.Serialize(Element);
+        Constant *CE = ConstantExpr::getBitCast(GVE, EmptyTy);
+        ArrayElements.push_back(cast<Constant>(CE));
+      } else {
+        ArrayElements.push_back(ConstantPointerNull::get(EmptyTy));
+      }
+    }
+    
+    Constant *CA = ConstantArray::get(AT, ArrayElements);
+    GlobalVariable *CAGV = new GlobalVariable(AT, true,
+                                              GlobalValue::InternalLinkage,
+                                              CA, "llvm.dbg.array",
+                                              SR.getModule());
+    CAGV->setSection("llvm.metadata");
+    Constant *CAE = ConstantExpr::getBitCast(CAGV, EmptyTy);
+    Elements.push_back(CAE);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+/// DIGetTypesVisitor - This DIVisitor gathers all the field types in
+/// the supplied DebugInfoDesc.
+class DIGetTypesVisitor : public DIVisitor {
+private:
+  DISerializer &SR;                     // Active serializer.
+  std::vector<const Type*> &Fields;     // Type accumulator.
+  
+public:
+  DIGetTypesVisitor(DISerializer &S, std::vector<const Type*> &F)
+  : DIVisitor()
+  , SR(S)
+  , Fields(F)
+  {}
+  
+  /// Apply - Set the value of each of the fields.
+  ///
+  virtual void Apply(int &Field) {
+    Fields.push_back(Type::Int32Ty);
+  }
+  virtual void Apply(unsigned &Field) {
+    Fields.push_back(Type::Int32Ty);
+  }
+  virtual void Apply(int64_t &Field) {
+    Fields.push_back(Type::Int64Ty);
+  }
+  virtual void Apply(uint64_t &Field) {
+    Fields.push_back(Type::Int64Ty);
+  }
+  virtual void Apply(bool &Field) {
+    Fields.push_back(Type::Int1Ty);
+  }
+  virtual void Apply(std::string &Field) {
+    Fields.push_back(SR.getStrPtrType());
+  }
+  virtual void Apply(DebugInfoDesc *&Field) {
+    // FIXME - At some point should use specific type.
+    const PointerType *EmptyTy = SR.getEmptyStructPtrType();
+    Fields.push_back(EmptyTy);
+  }
+  virtual void Apply(GlobalVariable *&Field) {
+    const PointerType *EmptyTy = SR.getEmptyStructPtrType();
+    Fields.push_back(EmptyTy);
+  }
+  virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
+    const PointerType *EmptyTy = SR.getEmptyStructPtrType();
+    Fields.push_back(EmptyTy);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+/// DIVerifyVisitor - This DIVisitor verifies all the field types against
+/// a constant initializer.
+class DIVerifyVisitor : public DIVisitor {
+private:
+  DIVerifier &VR;                       // Active verifier.
+  bool IsValid;                         // Validity status.
+  unsigned I;                           // Current operand index.
+  ConstantStruct *CI;                   // GlobalVariable constant initializer.
+  
+public:
+  DIVerifyVisitor(DIVerifier &V, GlobalVariable *GV)
+  : DIVisitor()
+  , VR(V)
+  , IsValid(true)
+  , I(0)
+  , CI(cast<ConstantStruct>(GV->getInitializer()))
+  {
+  }
+  
+  // Accessors.
+  bool isValid() const { return IsValid; }
+  
+  /// Apply - Set the value of each of the fields.
+  ///
+  virtual void Apply(int &Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isa<ConstantInt>(C);
+  }
+  virtual void Apply(unsigned &Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isa<ConstantInt>(C);
+  }
+  virtual void Apply(int64_t &Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isa<ConstantInt>(C);
+  }
+  virtual void Apply(uint64_t &Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isa<ConstantInt>(C);
+  }
+  virtual void Apply(bool &Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isa<ConstantInt>(C) && C->getType() == Type::Int1Ty;
+  }
+  virtual void Apply(std::string &Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid &&
+              (!C || isStringValue(C) || C->isNullValue());
+  }
+  virtual void Apply(DebugInfoDesc *&Field) {
+    // FIXME - Prepare the correct descriptor.
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isGlobalVariable(C);
+  }
+  virtual void Apply(GlobalVariable *&Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isGlobalVariable(C);
+  }
+  virtual void Apply(std::vector<DebugInfoDesc *> &Field) {
+    Constant *C = CI->getOperand(I++);
+    IsValid = IsValid && isGlobalVariable(C);
+    if (!IsValid) return;
+
+    GlobalVariable *GV = getGlobalVariable(C);
+    IsValid = IsValid && GV && GV->hasInitializer();
+    if (!IsValid) return;
+    
+    ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer());
+    IsValid = IsValid && CA;
+    if (!IsValid) return;
+
+    for (unsigned i = 0, N = CA->getNumOperands(); IsValid && i < N; ++i) {
+      IsValid = IsValid && isGlobalVariable(CA->getOperand(i));
+      if (!IsValid) return;
+    
+      GlobalVariable *GVE = getGlobalVariable(CA->getOperand(i));
+      VR.Verify(GVE);
+    }
+  }
+};
+
+
+//===----------------------------------------------------------------------===//
+
+/// TagFromGlobal - Returns the tag number from a debug info descriptor
+/// GlobalVariable.   Return DIIValid if operand is not an unsigned int. 
+unsigned DebugInfoDesc::TagFromGlobal(GlobalVariable *GV) {
+  ConstantInt *C = getUIntOperand(GV, 0);
+  return C ? ((unsigned)C->getZExtValue() & ~LLVMDebugVersionMask) :
+             (unsigned)DW_TAG_invalid;
+}
+
+/// VersionFromGlobal - Returns the version number from a debug info
+/// descriptor GlobalVariable.  Return DIIValid if operand is not an unsigned
+/// int.
+unsigned  DebugInfoDesc::VersionFromGlobal(GlobalVariable *GV) {
+  ConstantInt *C = getUIntOperand(GV, 0);
+  return C ? ((unsigned)C->getZExtValue() & LLVMDebugVersionMask) :
+             (unsigned)DW_TAG_invalid;
+}
+
+/// DescFactory - Create an instance of debug info descriptor based on Tag.
+/// Return NULL if not a recognized Tag.
+DebugInfoDesc *DebugInfoDesc::DescFactory(unsigned Tag) {
+  switch (Tag) {
+  case DW_TAG_anchor:           return new AnchorDesc();
+  case DW_TAG_compile_unit:     return new CompileUnitDesc();
+  case DW_TAG_variable:         return new GlobalVariableDesc();
+  case DW_TAG_subprogram:       return new SubprogramDesc();
+  case DW_TAG_lexical_block:    return new BlockDesc();
+  case DW_TAG_base_type:        return new BasicTypeDesc();
+  case DW_TAG_typedef:
+  case DW_TAG_pointer_type:        
+  case DW_TAG_reference_type:
+  case DW_TAG_const_type:
+  case DW_TAG_volatile_type:        
+  case DW_TAG_restrict_type:
+  case DW_TAG_member:
+  case DW_TAG_inheritance:      return new DerivedTypeDesc(Tag);
+  case DW_TAG_array_type:
+  case DW_TAG_structure_type:
+  case DW_TAG_union_type:
+  case DW_TAG_enumeration_type:
+  case DW_TAG_vector_type:
+  case DW_TAG_subroutine_type:  return new CompositeTypeDesc(Tag);
+  case DW_TAG_subrange_type:    return new SubrangeDesc();
+  case DW_TAG_enumerator:       return new EnumeratorDesc();
+  case DW_TAG_return_variable:
+  case DW_TAG_arg_variable:
+  case DW_TAG_auto_variable:    return new VariableDesc(Tag);
+  default: break;
+  }
+  return NULL;
+}
+
+/// getLinkage - get linkage appropriate for this type of descriptor.
+///
+GlobalValue::LinkageTypes DebugInfoDesc::getLinkage() const {
+  return GlobalValue::InternalLinkage;
+}
+
+/// ApplyToFields - Target the vistor to the fields of the descriptor.
+///
+void DebugInfoDesc::ApplyToFields(DIVisitor *Visitor) {
+  Visitor->Apply(Tag);
+}
+
+//===----------------------------------------------------------------------===//
+
+AnchorDesc::AnchorDesc()
+: DebugInfoDesc(DW_TAG_anchor)
+, AnchorTag(0)
+{}
+AnchorDesc::AnchorDesc(AnchoredDesc *D)
+: DebugInfoDesc(DW_TAG_anchor)
+, AnchorTag(D->getTag())
+{}
+
+// Implement isa/cast/dyncast.
+bool AnchorDesc::classof(const DebugInfoDesc *D) {
+  return D->getTag() == DW_TAG_anchor;
+}
+  
+/// getLinkage - get linkage appropriate for this type of descriptor.
+///
+GlobalValue::LinkageTypes AnchorDesc::getLinkage() const {
+  return GlobalValue::LinkOnceLinkage;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the TransUnitDesc.
+///
+void AnchorDesc::ApplyToFields(DIVisitor *Visitor) {
+  DebugInfoDesc::ApplyToFields(Visitor);
+  
+  Visitor->Apply(AnchorTag);
+}
+
+/// getDescString - Return a string used to compose global names and labels. A
+/// A global variable name needs to be defined for each debug descriptor that is
+/// anchored. NOTE: that each global variable named here also needs to be added
+/// to the list of names left external in the internalizer.
+///   ExternalNames.insert("llvm.dbg.compile_units");
+///   ExternalNames.insert("llvm.dbg.global_variables");
+///   ExternalNames.insert("llvm.dbg.subprograms");
+const char *AnchorDesc::getDescString() const {
+  switch (AnchorTag) {
+  case DW_TAG_compile_unit: return CompileUnitDesc::AnchorString;
+  case DW_TAG_variable:     return GlobalVariableDesc::AnchorString;
+  case DW_TAG_subprogram:   return SubprogramDesc::AnchorString;
+  default: break;
+  }
+
+  assert(0 && "Tag does not have a case for anchor string");
+  return "";
+}
+
+/// getTypeString - Return a string used to label this descriptors type.
+///
+const char *AnchorDesc::getTypeString() const {
+  return "llvm.dbg.anchor.type";
+}
+
+#ifndef NDEBUG
+void AnchorDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "AnchorTag(" << AnchorTag << ")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+AnchoredDesc::AnchoredDesc(unsigned T)
+: DebugInfoDesc(T)
+, Anchor(NULL)
+{}
+
+/// ApplyToFields - Target the visitor to the fields of the AnchoredDesc.
+///
+void AnchoredDesc::ApplyToFields(DIVisitor *Visitor) {
+  DebugInfoDesc::ApplyToFields(Visitor);
+
+  Visitor->Apply(Anchor);
+}
+
+//===----------------------------------------------------------------------===//
+
+CompileUnitDesc::CompileUnitDesc()
+: AnchoredDesc(DW_TAG_compile_unit)
+, Language(0)
+, FileName("")
+, Directory("")
+, Producer("")
+{}
+
+// Implement isa/cast/dyncast.
+bool CompileUnitDesc::classof(const DebugInfoDesc *D) {
+  return D->getTag() == DW_TAG_compile_unit;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the CompileUnitDesc.
+///
+void CompileUnitDesc::ApplyToFields(DIVisitor *Visitor) {
+  AnchoredDesc::ApplyToFields(Visitor);
+  
+  // Handle cases out of sync with compiler.
+  if (getVersion() == 0) {
+    unsigned DebugVersion;
+    Visitor->Apply(DebugVersion);
+  }
+
+  Visitor->Apply(Language);
+  Visitor->Apply(FileName);
+  Visitor->Apply(Directory);
+  Visitor->Apply(Producer);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *CompileUnitDesc::getDescString() const {
+  return "llvm.dbg.compile_unit";
+}
+
+/// getTypeString - Return a string used to label this descriptors type.
+///
+const char *CompileUnitDesc::getTypeString() const {
+  return "llvm.dbg.compile_unit.type";
+}
+
+/// getAnchorString - Return a string used to label this descriptor's anchor.
+///
+const char *CompileUnitDesc::AnchorString = "llvm.dbg.compile_units";
+const char *CompileUnitDesc::getAnchorString() const {
+  return AnchorString;
+}
+
+#ifndef NDEBUG
+void CompileUnitDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Anchor(" << getAnchor() << "), "
+       << "Language(" << Language << "), "
+       << "FileName(\"" << FileName << "\"), "
+       << "Directory(\"" << Directory << "\"), "
+       << "Producer(\"" << Producer << "\")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+TypeDesc::TypeDesc(unsigned T)
+: DebugInfoDesc(T)
+, Context(NULL)
+, Name("")
+, File(NULL)
+, Line(0)
+, Size(0)
+, Align(0)
+, Offset(0)
+, Flags(0)
+{}
+
+/// ApplyToFields - Target the visitor to the fields of the TypeDesc.
+///
+void TypeDesc::ApplyToFields(DIVisitor *Visitor) {
+  DebugInfoDesc::ApplyToFields(Visitor);
+  
+  Visitor->Apply(Context);
+  Visitor->Apply(Name);
+  Visitor->Apply(File);
+  Visitor->Apply(Line);
+  Visitor->Apply(Size);
+  Visitor->Apply(Align);
+  Visitor->Apply(Offset);
+  if (getVersion() > LLVMDebugVersion4) Visitor->Apply(Flags);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *TypeDesc::getDescString() const {
+  return "llvm.dbg.type";
+}
+
+/// getTypeString - Return a string used to label this descriptor's type.
+///
+const char *TypeDesc::getTypeString() const {
+  return "llvm.dbg.type.type";
+}
+
+#ifndef NDEBUG
+void TypeDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Context(" << Context << "), "
+       << "Name(\"" << Name << "\"), "
+       << "File(" << File << "), "
+       << "Line(" << Line << "), "
+       << "Size(" << Size << "), "
+       << "Align(" << Align << "), "
+       << "Offset(" << Offset << "), "
+       << "Flags(" << Flags << ")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+BasicTypeDesc::BasicTypeDesc()
+: TypeDesc(DW_TAG_base_type)
+, Encoding(0)
+{}
+
+// Implement isa/cast/dyncast.
+bool BasicTypeDesc::classof(const DebugInfoDesc *D) {
+  return D->getTag() == DW_TAG_base_type;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the BasicTypeDesc.
+///
+void BasicTypeDesc::ApplyToFields(DIVisitor *Visitor) {
+  TypeDesc::ApplyToFields(Visitor);
+  
+  Visitor->Apply(Encoding);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *BasicTypeDesc::getDescString() const {
+  return "llvm.dbg.basictype";
+}
+
+/// getTypeString - Return a string used to label this descriptor's type.
+///
+const char *BasicTypeDesc::getTypeString() const {
+  return "llvm.dbg.basictype.type";
+}
+
+#ifndef NDEBUG
+void BasicTypeDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Context(" << getContext() << "), "
+       << "Name(\"" << getName() << "\"), "
+       << "Size(" << getSize() << "), "
+       << "Encoding(" << Encoding << ")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+DerivedTypeDesc::DerivedTypeDesc(unsigned T)
+: TypeDesc(T)
+, FromType(NULL)
+{}
+
+// Implement isa/cast/dyncast.
+bool DerivedTypeDesc::classof(const DebugInfoDesc *D) {
+  unsigned T =  D->getTag();
+  switch (T) {
+  case DW_TAG_typedef:
+  case DW_TAG_pointer_type:
+  case DW_TAG_reference_type:
+  case DW_TAG_const_type:
+  case DW_TAG_volatile_type:
+  case DW_TAG_restrict_type:
+  case DW_TAG_member:
+  case DW_TAG_inheritance:
+    return true;
+  default: break;
+  }
+  return false;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the DerivedTypeDesc.
+///
+void DerivedTypeDesc::ApplyToFields(DIVisitor *Visitor) {
+  TypeDesc::ApplyToFields(Visitor);
+  
+  Visitor->Apply(FromType);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *DerivedTypeDesc::getDescString() const {
+  return "llvm.dbg.derivedtype";
+}
+
+/// getTypeString - Return a string used to label this descriptor's type.
+///
+const char *DerivedTypeDesc::getTypeString() const {
+  return "llvm.dbg.derivedtype.type";
+}
+
+#ifndef NDEBUG
+void DerivedTypeDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Context(" << getContext() << "), "
+       << "Name(\"" << getName() << "\"), "
+       << "Size(" << getSize() << "), "
+       << "File(" << getFile() << "), "
+       << "Line(" << getLine() << "), "
+       << "FromType(" << FromType << ")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+CompositeTypeDesc::CompositeTypeDesc(unsigned T)
+: DerivedTypeDesc(T)
+, Elements()
+{}
+  
+// Implement isa/cast/dyncast.
+bool CompositeTypeDesc::classof(const DebugInfoDesc *D) {
+  unsigned T =  D->getTag();
+  switch (T) {
+  case DW_TAG_array_type:
+  case DW_TAG_structure_type:
+  case DW_TAG_union_type:
+  case DW_TAG_enumeration_type:
+  case DW_TAG_vector_type:
+  case DW_TAG_subroutine_type:
+    return true;
+  default: break;
+  }
+  return false;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the CompositeTypeDesc.
+///
+void CompositeTypeDesc::ApplyToFields(DIVisitor *Visitor) {
+  DerivedTypeDesc::ApplyToFields(Visitor);  
+
+  Visitor->Apply(Elements);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *CompositeTypeDesc::getDescString() const {
+  return "llvm.dbg.compositetype";
+}
+
+/// getTypeString - Return a string used to label this descriptor's type.
+///
+const char *CompositeTypeDesc::getTypeString() const {
+  return "llvm.dbg.compositetype.type";
+}
+
+#ifndef NDEBUG
+void CompositeTypeDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Context(" << getContext() << "), "
+       << "Name(\"" << getName() << "\"), "
+       << "Size(" << getSize() << "), "
+       << "File(" << getFile() << "), "
+       << "Line(" << getLine() << "), "
+       << "FromType(" << getFromType() << "), "
+       << "Elements.size(" << Elements.size() << ")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+SubrangeDesc::SubrangeDesc()
+: DebugInfoDesc(DW_TAG_subrange_type)
+, Lo(0)
+, Hi(0)
+{}
+
+// Implement isa/cast/dyncast.
+bool SubrangeDesc::classof(const DebugInfoDesc *D) {
+  return D->getTag() == DW_TAG_subrange_type;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the SubrangeDesc.
+///
+void SubrangeDesc::ApplyToFields(DIVisitor *Visitor) {
+  DebugInfoDesc::ApplyToFields(Visitor);
+
+  Visitor->Apply(Lo);
+  Visitor->Apply(Hi);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *SubrangeDesc::getDescString() const {
+  return "llvm.dbg.subrange";
+}
+  
+/// getTypeString - Return a string used to label this descriptor's type.
+///
+const char *SubrangeDesc::getTypeString() const {
+  return "llvm.dbg.subrange.type";
+}
+
+#ifndef NDEBUG
+void SubrangeDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Lo(" << Lo << "), "
+       << "Hi(" << Hi << ")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+EnumeratorDesc::EnumeratorDesc()
+: DebugInfoDesc(DW_TAG_enumerator)
+, Name("")
+, Value(0)
+{}
+
+// Implement isa/cast/dyncast.
+bool EnumeratorDesc::classof(const DebugInfoDesc *D) {
+  return D->getTag() == DW_TAG_enumerator;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the EnumeratorDesc.
+///
+void EnumeratorDesc::ApplyToFields(DIVisitor *Visitor) {
+  DebugInfoDesc::ApplyToFields(Visitor);
+
+  Visitor->Apply(Name);
+  Visitor->Apply(Value);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *EnumeratorDesc::getDescString() const {
+  return "llvm.dbg.enumerator";
+}
+  
+/// getTypeString - Return a string used to label this descriptor's type.
+///
+const char *EnumeratorDesc::getTypeString() const {
+  return "llvm.dbg.enumerator.type";
+}
+
+#ifndef NDEBUG
+void EnumeratorDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Name(" << Name << "), "
+       << "Value(" << Value << ")\n";
+}
+#endif
+
+//===----------------------------------------------------------------------===//
+
+VariableDesc::VariableDesc(unsigned T)
+: DebugInfoDesc(T)
+, Context(NULL)
+, Name("")
+, File(NULL)
+, Line(0)
+, TyDesc(0)
+{}
+
+// Implement isa/cast/dyncast.
+bool VariableDesc::classof(const DebugInfoDesc *D) {
+  unsigned T =  D->getTag();
+  switch (T) {
+  case DW_TAG_auto_variable:
+  case DW_TAG_arg_variable:
+  case DW_TAG_return_variable:
+    return true;
+  default: break;
+  }
+  return false;
+}
+
+/// ApplyToFields - Target the visitor to the fields of the VariableDesc.
+///
+void VariableDesc::ApplyToFields(DIVisitor *Visitor) {
+  DebugInfoDesc::ApplyToFields(Visitor);
+  
+  Visitor->Apply(Context);
+  Visitor->Apply(Name);
+  Visitor->Apply(File);
+  Visitor->Apply(Line);
+  Visitor->Apply(TyDesc);
+}
+
+/// getDescString - Return a string used to compose global names and labels.
+///
+const char *VariableDesc::getDescString() const {
+  return "llvm.dbg.variable";
+}
+
+/// getTypeString - Return a string used to label this descriptor's type.
+///
+const char *VariableDesc::getTypeString() const {
+  return "llvm.dbg.variable.type";
+}
+
+#ifndef NDEBUG
+void VariableDesc::dump() {
+  cerr << getDescString() << " "
+       << "Version(" << getVersion() << "), "
+       << "Tag(" << getTag() << "), "
+       << "Context(" << Context << "), "
+       << "Name(\"" << Name << "\"), "
+       << "File(" << File << "), "
+       << "Line(" << Line << "), "
+       << "TyDesc(" << TyDesc << ")\n";
+}
+#endif
+
+//===-------------------------------------------------------------