MachineDebugInfo.cpp

}

/// getDescString - Return a string used to compose global names and labels.
///
const char *SubprogramDesc::getDescString() const {
  return "llvm.dbg.subprogram";
}

/// getTypeString - Return a string used to label this descriptors type.
///
const char *SubprogramDesc::getTypeString() const {
  return "llvm.dbg.subprogram.type";
}

/// getAnchorString - Return a string used to label this descriptor's anchor.
///
const char *SubprogramDesc::getAnchorString() const {
  return "llvm.dbg.subprograms";
}

#ifndef NDEBUG
void SubprogramDesc::dump() {
  std::cerr << getDescString() << " "
            << "Tag(" << getTag() << "), "
            << "Anchor(" << getAnchor() << "), "
            << "Name(\"" << getName() << "\"), "
            << "Type(\"" << getTypeDesc() << "\"), "
            << "IsStatic(" << (isStatic() ? "true" : "false") << "), "
            << "IsDefinition(" << (isDefinition() ? "true" : "false") << ")\n";
}
#endif

//===----------------------------------------------------------------------===//

DebugInfoDesc *DIDeserializer::Deserialize(Value *V) {
  return Deserialize(getGlobalVariable(V));
}
DebugInfoDesc *DIDeserializer::Deserialize(GlobalVariable *GV) {
  // Handle NULL.
  if (!GV) return NULL;

  // Check to see if it has been already deserialized.
  DebugInfoDesc *&Slot = GlobalDescs[GV];
  if (Slot) return Slot;

  // Get the Tag from the global.
  unsigned Tag = DebugInfoDesc::TagFromGlobal(GV);
  
  // Get the debug version if a compile unit.
  if (Tag == DW_TAG_compile_unit) {
    DebugVersion = CompileUnitDesc::DebugVersionFromGlobal(GV);
  }
  
  // Create an empty instance of the correct sort.
  Slot = DebugInfoDesc::DescFactory(Tag);
  assert(Slot && "Unknown Tag");
  
  // Deserialize the fields.
  DIDeserializeVisitor DRAM(*this, GV);
  DRAM.ApplyToFields(Slot);
  
  return Slot;
}

//===----------------------------------------------------------------------===//

/// getStrPtrType - Return a "sbyte *" type.
///
const PointerType *DISerializer::getStrPtrType() {
  // If not already defined.
  if (!StrPtrTy) {
    // Construct the pointer to signed bytes.
    StrPtrTy = PointerType::get(Type::SByteTy);
  }
  
  return StrPtrTy;
}

/// getEmptyStructPtrType - Return a "{ }*" type.
///
const PointerType *DISerializer::getEmptyStructPtrType() {
  // If not already defined.
  if (!EmptyStructPtrTy) {
    // Construct the empty structure type.
    const StructType *EmptyStructTy =
                                    StructType::get(std::vector<const Type*>());
    // Construct the pointer to empty structure type.
    EmptyStructPtrTy = PointerType::get(EmptyStructTy);
  }
  
  return EmptyStructPtrTy;
}

/// getTagType - Return the type describing the specified descriptor (via tag.)
///
const StructType *DISerializer::getTagType(DebugInfoDesc *DD) {
  // Attempt to get the previously defined type.
  StructType *&Ty = TagTypes[DD->getTag()];
  
  // If not already defined.
  if (!Ty) {
    // Set up fields vector.
    std::vector<const Type*> Fields;
    // Get types of fields.
    DIGetTypesVisitor GTAM(*this, Fields);
    GTAM.ApplyToFields(DD);

    // Construct structured type.
    Ty = StructType::get(Fields);
    
    // Register type name with module.
    M->addTypeName(DD->getTypeString(), Ty);
  }
  
  return Ty;
}

/// getString - Construct the string as constant string global.
///
Constant *DISerializer::getString(const std::string &String) {
  // Check string cache for previous edition.
  Constant *&Slot = StringCache[String];
  // return Constant if previously defined.
  if (Slot) return Slot;
  // Construct string as an llvm constant.
  Constant *ConstStr = ConstantArray::get(String);
  // Otherwise create and return a new string global.
  GlobalVariable *StrGV = new GlobalVariable(ConstStr->getType(), true,
                                             GlobalVariable::InternalLinkage,
                                             ConstStr, "str", M);
  // Convert to generic string pointer.
  Slot = ConstantExpr::getCast(StrGV, getStrPtrType());
  return Slot;
  
}

/// Serialize - Recursively cast the specified descriptor into a GlobalVariable
/// so that it can be serialized to a .bc or .ll file.
GlobalVariable *DISerializer::Serialize(DebugInfoDesc *DD) {
  // Check if the DebugInfoDesc is already in the map.
  GlobalVariable *&Slot = DescGlobals[DD];
  
  // See if DebugInfoDesc exists, if so return prior GlobalVariable.
  if (Slot) return Slot;
  
  // Get the type associated with the Tag.
  const StructType *Ty = getTagType(DD);

  // Create the GlobalVariable early to prevent infinite recursion.
  GlobalVariable *GV = new GlobalVariable(Ty, true, DD->getLinkage(),
                                          NULL, DD->getDescString(), M);

  // Insert new GlobalVariable in DescGlobals map.
  Slot = GV;
 
  // Set up elements vector
  std::vector<Constant*> Elements;
  // Add fields.
  DISerializeVisitor SRAM(*this, Elements);
  SRAM.ApplyToFields(DD);
  
  // Set the globals initializer.
  GV->setInitializer(ConstantStruct::get(Ty, Elements));
  
  return GV;
}

//===----------------------------------------------------------------------===//

/// markVisited - Return true if the GlobalVariable hase been "seen" before.
/// Mark visited otherwise.
bool DIVerifier::markVisited(GlobalVariable *GV) {
  // Check if the GlobalVariable is already in the Visited set.
  std::set<GlobalVariable *>::iterator VI = Visited.lower_bound(GV);
  
  // See if GlobalVariable exists.
  bool Exists = VI != Visited.end() && *VI == GV;

  // Insert in set.
  if (!Exists) Visited.insert(VI, GV);
  
  return Exists;
}

/// Verify - Return true if the GlobalVariable appears to be a valid
/// serialization of a DebugInfoDesc.
bool DIVerifier::Verify(Value *V) {
  return Verify(getGlobalVariable(V));
}
bool DIVerifier::Verify(GlobalVariable *GV) {
  // Check if seen before.
  if (markVisited(GV)) return true;
  
  // Get the Tag
  unsigned Tag = DebugInfoDesc::TagFromGlobal(GV);
  if (Tag == DW_TAG_invalid) return false;

  // If a compile unit we need the debug version.
  if (Tag == DW_TAG_compile_unit) {
    DebugVersion = CompileUnitDesc::DebugVersionFromGlobal(GV);
    if (DebugVersion == DW_TAG_invalid) return false;
  }

  // Construct an empty DebugInfoDesc.
  DebugInfoDesc *DD = DebugInfoDesc::DescFactory(Tag);
  if (!DD) return false;
  
  // Get the initializer constant.
  ConstantStruct *CI = cast<ConstantStruct>(GV->getInitializer());
  
  // Get the operand count.
  unsigned N = CI->getNumOperands();
  
  // Get the field count.
  unsigned &Slot = Counts[Tag];
  if (!Slot) {
    // Check the operand count to the field count
    DICountVisitor CTAM;
    CTAM.ApplyToFields(DD);
    Slot = CTAM.getCount();
  }
  
  // Field count must equal operand count.
  if (Slot != N) {
    delete DD;
    return false;
  }
  
  // Check each field for valid type.
  DIVerifyVisitor VRAM(*this, GV);
  VRAM.ApplyToFields(DD);
  
  // Release empty DebugInfoDesc.
  delete DD;
  
  // Return result of field tests.
  return VRAM.isValid();
}

//===----------------------------------------------------------------------===//


MachineDebugInfo::MachineDebugInfo()
: DR()
, CompileUnits()
, Directories()
, SourceFiles()
, Lines()
{
  
}
MachineDebugInfo::~MachineDebugInfo() {

}

/// doInitialization - Initialize the debug state for a new module.
///
bool MachineDebugInfo::doInitialization() {
  return false;
}

/// doFinalization - Tear down the debug state after completion of a module.
///
bool MachineDebugInfo::doFinalization() {
  return false;
}

/// getDescFor - Convert a Value to a debug information descriptor.
///
// FIXME - use new Value type when available.
DebugInfoDesc *MachineDebugInfo::getDescFor(Value *V) {
  return DR.Deserialize(V);
}

/// Verify - Verify that a Value is debug information descriptor.
///
bool MachineDebugInfo::Verify(Value *V) {
  DIVerifier VR;
  return VR.Verify(V);
}

/// AnalyzeModule - Scan the module for global debug information.
///
void MachineDebugInfo::AnalyzeModule(Module &M) {
  SetupCompileUnits(M);
}

/// SetupCompileUnits - Set up the unique vector of compile units.
///
void MachineDebugInfo::SetupCompileUnits(Module &M) {
  std::vector<CompileUnitDesc *>CU = getAnchoredDescriptors<CompileUnitDesc>(M);
  
  for (unsigned i = 0, N = CU.size(); i < N; i++) {
    CompileUnits.insert(CU[i]);
  }
}

/// getCompileUnits - Return a vector of debug compile units.
///
const UniqueVector<CompileUnitDesc *> MachineDebugInfo::getCompileUnits()const{
  return CompileUnits;
}

/// getGlobalVariablesUsing - Return all of the GlobalVariables that use the
/// named GlobalVariable.
std::vector<GlobalVariable*>
MachineDebugInfo::getGlobalVariablesUsing(Module &M,
                                          const std::string &RootName) {
  return ::getGlobalVariablesUsing(M, RootName);
}