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llvm-project/llvm/lib/IR/DebugInfo.cpp

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//===--- DebugInfo.cpp - Debug Information Helper Classes -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the helper classes used to build and interpret debug
// information in LLVM IR form.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ValueHandle.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::dwarf;
//===----------------------------------------------------------------------===//
// DIDescriptor
//===----------------------------------------------------------------------===//
bool DIDescriptor::Verify() const {
return DbgNode &&
(DIDerivedType(DbgNode).Verify() ||
DICompositeType(DbgNode).Verify() || DIBasicType(DbgNode).Verify() ||
DIVariable(DbgNode).Verify() || DISubprogram(DbgNode).Verify() ||
DIGlobalVariable(DbgNode).Verify() || DIFile(DbgNode).Verify() ||
DICompileUnit(DbgNode).Verify() || DINameSpace(DbgNode).Verify() ||
DILexicalBlock(DbgNode).Verify() ||
DILexicalBlockFile(DbgNode).Verify() ||
DISubrange(DbgNode).Verify() || DIEnumerator(DbgNode).Verify() ||
DIObjCProperty(DbgNode).Verify() ||
DITemplateTypeParameter(DbgNode).Verify() ||
DITemplateValueParameter(DbgNode).Verify() ||
DIImportedEntity(DbgNode).Verify());
}
static Value *getField(const MDNode *DbgNode, unsigned Elt) {
if (DbgNode == 0 || Elt >= DbgNode->getNumOperands())
return 0;
return DbgNode->getOperand(Elt);
}
static MDNode *getNodeField(const MDNode *DbgNode, unsigned Elt) {
return dyn_cast_or_null<MDNode>(getField(DbgNode, Elt));
}
static StringRef getStringField(const MDNode *DbgNode, unsigned Elt) {
if (MDString *MDS = dyn_cast_or_null<MDString>(getField(DbgNode, Elt)))
return MDS->getString();
return StringRef();
}
StringRef DIDescriptor::getStringField(unsigned Elt) const {
return ::getStringField(DbgNode, Elt);
}
uint64_t DIDescriptor::getUInt64Field(unsigned Elt) const {
if (DbgNode == 0)
return 0;
if (Elt < DbgNode->getNumOperands())
if (ConstantInt *CI
= dyn_cast_or_null<ConstantInt>(DbgNode->getOperand(Elt)))
return CI->getZExtValue();
return 0;
}
int64_t DIDescriptor::getInt64Field(unsigned Elt) const {
if (DbgNode == 0)
return 0;
if (Elt < DbgNode->getNumOperands())
if (ConstantInt *CI
= dyn_cast_or_null<ConstantInt>(DbgNode->getOperand(Elt)))
return CI->getSExtValue();
return 0;
}
DIDescriptor DIDescriptor::getDescriptorField(unsigned Elt) const {
MDNode *Field = getNodeField(DbgNode, Elt);
return DIDescriptor(Field);
}
GlobalVariable *DIDescriptor::getGlobalVariableField(unsigned Elt) const {
if (DbgNode == 0)
return 0;
if (Elt < DbgNode->getNumOperands())
return dyn_cast_or_null<GlobalVariable>(DbgNode->getOperand(Elt));
return 0;
}
Constant *DIDescriptor::getConstantField(unsigned Elt) const {
if (DbgNode == 0)
return 0;
if (Elt < DbgNode->getNumOperands())
return dyn_cast_or_null<Constant>(DbgNode->getOperand(Elt));
return 0;
}
Function *DIDescriptor::getFunctionField(unsigned Elt) const {
if (DbgNode == 0)
return 0;
if (Elt < DbgNode->getNumOperands())
return dyn_cast_or_null<Function>(DbgNode->getOperand(Elt));
return 0;
}
void DIDescriptor::replaceFunctionField(unsigned Elt, Function *F) {
if (DbgNode == 0)
return;
if (Elt < DbgNode->getNumOperands()) {
MDNode *Node = const_cast<MDNode*>(DbgNode);
Node->replaceOperandWith(Elt, F);
}
}
unsigned DIVariable::getNumAddrElements() const {
return DbgNode->getNumOperands()-8;
}
/// getInlinedAt - If this variable is inlined then return inline location.
MDNode *DIVariable::getInlinedAt() const {
return getNodeField(DbgNode, 7);
}
//===----------------------------------------------------------------------===//
// Predicates
//===----------------------------------------------------------------------===//
/// isBasicType - Return true if the specified tag is legal for
/// DIBasicType.
bool DIDescriptor::isBasicType() const {
if (!DbgNode) return false;
switch (getTag()) {
case dwarf::DW_TAG_base_type:
case dwarf::DW_TAG_unspecified_type:
return true;
default:
return false;
}
}
/// isDerivedType - Return true if the specified tag is legal for DIDerivedType.
bool DIDescriptor::isDerivedType() const {
if (!DbgNode) return false;
switch (getTag()) {
case dwarf::DW_TAG_typedef:
case dwarf::DW_TAG_pointer_type:
case dwarf::DW_TAG_ptr_to_member_type:
case dwarf::DW_TAG_reference_type:
case dwarf::DW_TAG_rvalue_reference_type:
case dwarf::DW_TAG_const_type:
case dwarf::DW_TAG_volatile_type:
case dwarf::DW_TAG_restrict_type:
case dwarf::DW_TAG_member:
case dwarf::DW_TAG_inheritance:
case dwarf::DW_TAG_friend:
return true;
default:
// CompositeTypes are currently modelled as DerivedTypes.
return isCompositeType();
}
}
/// isCompositeType - Return true if the specified tag is legal for
/// DICompositeType.
bool DIDescriptor::isCompositeType() const {
if (!DbgNode) return false;
switch (getTag()) {
case dwarf::DW_TAG_array_type:
case dwarf::DW_TAG_structure_type:
case dwarf::DW_TAG_union_type:
case dwarf::DW_TAG_enumeration_type:
case dwarf::DW_TAG_subroutine_type:
case dwarf::DW_TAG_class_type:
return true;
default:
return false;
}
}
/// isVariable - Return true if the specified tag is legal for DIVariable.
bool DIDescriptor::isVariable() const {
if (!DbgNode) return false;
switch (getTag()) {
case dwarf::DW_TAG_auto_variable:
case dwarf::DW_TAG_arg_variable:
return true;
default:
return false;
}
}
/// isType - Return true if the specified tag is legal for DIType.
bool DIDescriptor::isType() const {
return isBasicType() || isCompositeType() || isDerivedType();
}
/// isSubprogram - Return true if the specified tag is legal for
/// DISubprogram.
bool DIDescriptor::isSubprogram() const {
return DbgNode && getTag() == dwarf::DW_TAG_subprogram;
}
/// isGlobalVariable - Return true if the specified tag is legal for
/// DIGlobalVariable.
bool DIDescriptor::isGlobalVariable() const {
return DbgNode && (getTag() == dwarf::DW_TAG_variable ||
getTag() == dwarf::DW_TAG_constant);
}
/// isUnspecifiedParmeter - Return true if the specified tag is
/// DW_TAG_unspecified_parameters.
bool DIDescriptor::isUnspecifiedParameter() const {
return DbgNode && getTag() == dwarf::DW_TAG_unspecified_parameters;
}
/// isScope - Return true if the specified tag is one of the scope
/// related tag.
bool DIDescriptor::isScope() const {
if (!DbgNode) return false;
switch (getTag()) {
case dwarf::DW_TAG_compile_unit:
case dwarf::DW_TAG_lexical_block:
case dwarf::DW_TAG_subprogram:
case dwarf::DW_TAG_namespace:
return true;
default:
break;
}
return false;
}
/// isTemplateTypeParameter - Return true if the specified tag is
/// DW_TAG_template_type_parameter.
bool DIDescriptor::isTemplateTypeParameter() const {
return DbgNode && getTag() == dwarf::DW_TAG_template_type_parameter;
}
/// isTemplateValueParameter - Return true if the specified tag is
/// DW_TAG_template_value_parameter.
bool DIDescriptor::isTemplateValueParameter() const {
return DbgNode && (getTag() == dwarf::DW_TAG_template_value_parameter ||
getTag() == dwarf::DW_TAG_GNU_template_template_param ||
getTag() == dwarf::DW_TAG_GNU_template_parameter_pack);
}
/// isCompileUnit - Return true if the specified tag is DW_TAG_compile_unit.
bool DIDescriptor::isCompileUnit() const {
return DbgNode && getTag() == dwarf::DW_TAG_compile_unit;
}
/// isFile - Return true if the specified tag is DW_TAG_file_type.
bool DIDescriptor::isFile() const {
return DbgNode && getTag() == dwarf::DW_TAG_file_type;
}
/// isNameSpace - Return true if the specified tag is DW_TAG_namespace.
bool DIDescriptor::isNameSpace() const {
return DbgNode && getTag() == dwarf::DW_TAG_namespace;
}
/// isLexicalBlockFile - Return true if the specified descriptor is a
/// lexical block with an extra file.
bool DIDescriptor::isLexicalBlockFile() const {
return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
(DbgNode->getNumOperands() == 3);
}
/// isLexicalBlock - Return true if the specified tag is DW_TAG_lexical_block.
bool DIDescriptor::isLexicalBlock() const {
return DbgNode && getTag() == dwarf::DW_TAG_lexical_block &&
(DbgNode->getNumOperands() > 3);
}
/// isSubrange - Return true if the specified tag is DW_TAG_subrange_type.
bool DIDescriptor::isSubrange() const {
return DbgNode && getTag() == dwarf::DW_TAG_subrange_type;
}
/// isEnumerator - Return true if the specified tag is DW_TAG_enumerator.
bool DIDescriptor::isEnumerator() const {
return DbgNode && getTag() == dwarf::DW_TAG_enumerator;
}
/// isObjCProperty - Return true if the specified tag is DW_TAG_APPLE_property.
bool DIDescriptor::isObjCProperty() const {
return DbgNode && getTag() == dwarf::DW_TAG_APPLE_property;
}
/// \brief Return true if the specified tag is DW_TAG_imported_module or
/// DW_TAG_imported_declaration.
bool DIDescriptor::isImportedEntity() const {
return DbgNode && (getTag() == dwarf::DW_TAG_imported_module ||
getTag() == dwarf::DW_TAG_imported_declaration);
}
//===----------------------------------------------------------------------===//
// Simple Descriptor Constructors and other Methods
//===----------------------------------------------------------------------===//
unsigned DIArray::getNumElements() const {
if (!DbgNode)
return 0;
return DbgNode->getNumOperands();
}
/// replaceAllUsesWith - Replace all uses of the MDNode used by this
/// type with the one in the passed descriptor.
void DIType::replaceAllUsesWith(DIDescriptor &D) {
assert(DbgNode && "Trying to replace an unverified type!");
// Since we use a TrackingVH for the node, its easy for clients to manufacture
// legitimate situations where they want to replaceAllUsesWith() on something
// which, due to uniquing, has merged with the source. We shield clients from
// this detail by allowing a value to be replaced with replaceAllUsesWith()
// itself.
if (DbgNode != D) {
MDNode *Node = const_cast<MDNode*>(DbgNode);
const MDNode *DN = D;
const Value *V = cast_or_null<Value>(DN);
Node->replaceAllUsesWith(const_cast<Value*>(V));
MDNode::deleteTemporary(Node);
}
}
/// replaceAllUsesWith - Replace all uses of the MDNode used by this
/// type with the one in D.
void DIType::replaceAllUsesWith(MDNode *D) {
assert(DbgNode && "Trying to replace an unverified type!");
// Since we use a TrackingVH for the node, its easy for clients to manufacture
// legitimate situations where they want to replaceAllUsesWith() on something
// which, due to uniquing, has merged with the source. We shield clients from
// this detail by allowing a value to be replaced with replaceAllUsesWith()
// itself.
if (DbgNode != D) {
MDNode *Node = const_cast<MDNode*>(DbgNode);
const MDNode *DN = D;
const Value *V = cast_or_null<Value>(DN);
Node->replaceAllUsesWith(const_cast<Value*>(V));
MDNode::deleteTemporary(Node);
}
}
/// isUnsignedDIType - Return true if type encoding is unsigned.
bool DIType::isUnsignedDIType() {
DIDerivedType DTy(DbgNode);
if (DTy.Verify())
return DTy.getTypeDerivedFrom().isUnsignedDIType();
DIBasicType BTy(DbgNode);
if (BTy.Verify()) {
unsigned Encoding = BTy.getEncoding();
if (Encoding == dwarf::DW_ATE_unsigned ||
Encoding == dwarf::DW_ATE_unsigned_char ||
Encoding == dwarf::DW_ATE_boolean)
return true;
}
return false;
}
/// Verify - Verify that a compile unit is well formed.
bool DICompileUnit::Verify() const {
if (!isCompileUnit())
return false;
// Don't bother verifying the compilation directory or producer string
// as those could be empty.
if (getFilename().empty())
return false;
return DbgNode->getNumOperands() == 13;
}
/// Verify - Verify that an ObjC property is well formed.
bool DIObjCProperty::Verify() const {
if (!isObjCProperty())
return false;
// Don't worry about the rest of the strings for now.
return DbgNode->getNumOperands() == 8;
}
/// Check if a field at position Elt of a MDNode is a MDNode.
/// We currently allow an empty string and an integer.
/// But we don't allow a non-empty string in a MDNode field.
static bool fieldIsMDNode(const MDNode *DbgNode, unsigned Elt) {
// FIXME: This function should return true, if the field is null or the field
// is indeed a MDNode: return !Fld || isa<MDNode>(Fld).
Value *Fld = getField(DbgNode, Elt);
if (Fld && isa<MDString>(Fld) &&
!cast<MDString>(Fld)->getString().empty())
return false;
return true;
}
/// Verify - Verify that a type descriptor is well formed.
bool DIType::Verify() const {
if (!isType())
return false;
// Make sure Context @ field 2 is MDNode.
if (!fieldIsMDNode(DbgNode, 2))
return false;
// FIXME: Sink this into the various subclass verifies.
uint16_t Tag = getTag();
if (!isBasicType() && Tag != dwarf::DW_TAG_const_type &&
Tag != dwarf::DW_TAG_volatile_type && Tag != dwarf::DW_TAG_pointer_type &&
Tag != dwarf::DW_TAG_ptr_to_member_type &&
Tag != dwarf::DW_TAG_reference_type &&
Tag != dwarf::DW_TAG_rvalue_reference_type &&
Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_array_type &&
Tag != dwarf::DW_TAG_enumeration_type &&
Tag != dwarf::DW_TAG_subroutine_type &&
Tag != dwarf::DW_TAG_inheritance && Tag != dwarf::DW_TAG_friend &&
getFilename().empty())
return false;
// DIType is abstract, it should be a BasicType, a DerivedType or
// a CompositeType.
if (isBasicType())
DIBasicType(DbgNode).Verify();
else if (isCompositeType())
DICompositeType(DbgNode).Verify();
else if (isDerivedType())
DIDerivedType(DbgNode).Verify();
else
return false;
return true;
}
/// Verify - Verify that a basic type descriptor is well formed.
bool DIBasicType::Verify() const {
return isBasicType() && DbgNode->getNumOperands() == 10;
}
/// Verify - Verify that a derived type descriptor is well formed.
bool DIDerivedType::Verify() const {
// Make sure DerivedFrom @ field 9 is MDNode.
if (!fieldIsMDNode(DbgNode, 9))
return false;
if (getTag() == dwarf::DW_TAG_ptr_to_member_type)
// Make sure ClassType @ field 10 is MDNode.
if (!fieldIsMDNode(DbgNode, 10))
return false;
return isDerivedType() && DbgNode->getNumOperands() >= 10 &&
DbgNode->getNumOperands() <= 14;
}
/// Verify - Verify that a composite type descriptor is well formed.
bool DICompositeType::Verify() const {
if (!isCompositeType())
return false;
// Make sure DerivedFrom @ field 9 and ContainingType @ field 12 are MDNodes.
if (!fieldIsMDNode(DbgNode, 9))
return false;
if (!fieldIsMDNode(DbgNode, 12))
return false;
// If this is an array type verify that we have a DIType in the derived type
// field as that's the type of our element.
if (getTag() == dwarf::DW_TAG_array_type)
if (!DIType(getTypeDerivedFrom()))
return false;
return DbgNode->getNumOperands() >= 10 && DbgNode->getNumOperands() <= 14;
}
/// Verify - Verify that a subprogram descriptor is well formed.
bool DISubprogram::Verify() const {
if (!isSubprogram())
return false;
// Make sure context @ field 2 and type @ field 7 are MDNodes.
if (!fieldIsMDNode(DbgNode, 2))
return false;
if (!fieldIsMDNode(DbgNode, 7))
return false;
// Containing type @ field 12.
if (!fieldIsMDNode(DbgNode, 12))
return false;
return DbgNode->getNumOperands() == 20;
}
/// Verify - Verify that a global variable descriptor is well formed.
bool DIGlobalVariable::Verify() const {
if (!isGlobalVariable())
return false;
if (getDisplayName().empty())
return false;
// Make sure context @ field 2 and type @ field 8 are MDNodes.
if (!fieldIsMDNode(DbgNode, 2))
return false;
if (!fieldIsMDNode(DbgNode, 8))
return false;
// Make sure StaticDataMemberDeclaration @ field 12 is MDNode.
if (!fieldIsMDNode(DbgNode, 12))
return false;
return DbgNode->getNumOperands() == 13;
}
/// Verify - Verify that a variable descriptor is well formed.
bool DIVariable::Verify() const {
if (!isVariable())
return false;
// Make sure context @ field 1 and type @ field 5 are MDNodes.
if (!fieldIsMDNode(DbgNode, 1))
return false;
if (!fieldIsMDNode(DbgNode, 5))
return false;
return DbgNode->getNumOperands() >= 8;
}
/// Verify - Verify that a location descriptor is well formed.
bool DILocation::Verify() const {
if (!DbgNode)
return false;
return DbgNode->getNumOperands() == 4;
}
/// Verify - Verify that a namespace descriptor is well formed.
bool DINameSpace::Verify() const {
if (!isNameSpace())
return false;
return DbgNode->getNumOperands() == 5;
}
/// \brief Retrieve the MDNode for the directory/file pair.
MDNode *DIFile::getFileNode() const {
return getNodeField(DbgNode, 1);
}
/// \brief Verify that the file descriptor is well formed.
bool DIFile::Verify() const {
return isFile() && DbgNode->getNumOperands() == 2;
}
/// \brief Verify that the enumerator descriptor is well formed.
bool DIEnumerator::Verify() const {
return isEnumerator() && DbgNode->getNumOperands() == 3;
}
/// \brief Verify that the subrange descriptor is well formed.
bool DISubrange::Verify() const {
return isSubrange() && DbgNode->getNumOperands() == 3;
}
/// \brief Verify that the lexical block descriptor is well formed.
bool DILexicalBlock::Verify() const {
return isLexicalBlock() && DbgNode->getNumOperands() == 6;
}
/// \brief Verify that the file-scoped lexical block descriptor is well formed.
bool DILexicalBlockFile::Verify() const {
return isLexicalBlockFile() && DbgNode->getNumOperands() == 3;
}
/// \brief Verify that the template type parameter descriptor is well formed.
bool DITemplateTypeParameter::Verify() const {
return isTemplateTypeParameter() && DbgNode->getNumOperands() == 7;
}
/// \brief Verify that the template value parameter descriptor is well formed.
bool DITemplateValueParameter::Verify() const {
return isTemplateValueParameter() && DbgNode->getNumOperands() == 8;
}
/// \brief Verify that the imported module descriptor is well formed.
bool DIImportedEntity::Verify() const {
return isImportedEntity() &&
(DbgNode->getNumOperands() == 4 || DbgNode->getNumOperands() == 5);
}
/// getOriginalTypeSize - If this type is derived from a base type then
/// return base type size.
uint64_t DIDerivedType::getOriginalTypeSize() const {
uint16_t Tag = getTag();
if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
Tag != dwarf::DW_TAG_restrict_type)
return getSizeInBits();
DIType BaseType = getTypeDerivedFrom();
// If this type is not derived from any type then take conservative approach.
if (!BaseType.isValid())
return getSizeInBits();
// If this is a derived type, go ahead and get the base type, unless it's a
// reference then it's just the size of the field. Pointer types have no need
// of this since they're a different type of qualification on the type.
if (BaseType.getTag() == dwarf::DW_TAG_reference_type ||
BaseType.getTag() == dwarf::DW_TAG_rvalue_reference_type)
return getSizeInBits();
if (BaseType.isDerivedType())
return DIDerivedType(BaseType).getOriginalTypeSize();
return BaseType.getSizeInBits();
}
/// getObjCProperty - Return property node, if this ivar is associated with one.
MDNode *DIDerivedType::getObjCProperty() const {
return getNodeField(DbgNode, 10);
}
/// \brief Set the array of member DITypes.
void DICompositeType::setTypeArray(DIArray Elements, DIArray TParams) {
assert((!TParams || DbgNode->getNumOperands() == 14) &&
"If you're setting the template parameters this should include a slot "
"for that!");
TrackingVH<MDNode> N(*this);
N->replaceOperandWith(10, Elements);
if (TParams)
N->replaceOperandWith(13, TParams);
DbgNode = N;
}
void DICompositeType::addMember(DISubprogram S) {
SmallVector<llvm::Value *, 16> M;
DIArray OrigM = getTypeArray();
unsigned Elements = OrigM.getNumElements();
if (Elements == 1 && !OrigM.getElement(0))
Elements = 0;
M.reserve(Elements + 1);
for (unsigned i = 0; i != Elements; ++i)
M.push_back(OrigM.getElement(i));
M.push_back(S);
setTypeArray(DIArray(MDNode::get(DbgNode->getContext(), M)));
}
/// \brief Set the containing type.
void DICompositeType::setContainingType(DICompositeType ContainingType) {
TrackingVH<MDNode> N(*this);
N->replaceOperandWith(12, ContainingType);
DbgNode = N;
}
/// isInlinedFnArgument - Return true if this variable provides debugging
/// information for an inlined function arguments.
bool DIVariable::isInlinedFnArgument(const Function *CurFn) {
assert(CurFn && "Invalid function");
if (!getContext().isSubprogram())
return false;
// This variable is not inlined function argument if its scope
// does not describe current function.
return !DISubprogram(getContext()).describes(CurFn);
}
/// describes - Return true if this subprogram provides debugging
/// information for the function F.
bool DISubprogram::describes(const Function *F) {
assert(F && "Invalid function");
if (F == getFunction())
return true;
StringRef Name = getLinkageName();
if (Name.empty())
Name = getName();
if (F->getName() == Name)
return true;
return false;
}
unsigned DISubprogram::isOptimized() const {
assert (DbgNode && "Invalid subprogram descriptor!");
if (DbgNode->getNumOperands() == 15)
return getUnsignedField(14);
return 0;
}
MDNode *DISubprogram::getVariablesNodes() const {
return getNodeField(DbgNode, 18);
}
DIArray DISubprogram::getVariables() const {
return DIArray(getNodeField(DbgNode, 18));
}
Value *DITemplateValueParameter::getValue() const {
return getField(DbgNode, 4);
}
// If the current node has a parent scope then return that,
// else return an empty scope.
DIScope DIScope::getContext() const {
if (isType())
return DIType(DbgNode).getContext();
if (isSubprogram())
return DISubprogram(DbgNode).getContext();
if (isLexicalBlock())
return DILexicalBlock(DbgNode).getContext();
if (isLexicalBlockFile())
return DILexicalBlockFile(DbgNode).getContext();
if (isNameSpace())
return DINameSpace(DbgNode).getContext();
assert((isFile() || isCompileUnit()) && "Unhandled type of scope.");
return DIScope();
}
StringRef DIScope::getFilename() const {
if (!DbgNode)
return StringRef();
return ::getStringField(getNodeField(DbgNode, 1), 0);
}
StringRef DIScope::getDirectory() const {
if (!DbgNode)
return StringRef();
return ::getStringField(getNodeField(DbgNode, 1), 1);
}
DIArray DICompileUnit::getEnumTypes() const {
if (!DbgNode || DbgNode->getNumOperands() < 13)
return DIArray();
return DIArray(getNodeField(DbgNode, 7));
}
DIArray DICompileUnit::getRetainedTypes() const {
if (!DbgNode || DbgNode->getNumOperands() < 13)
return DIArray();
return DIArray(getNodeField(DbgNode, 8));
}
DIArray DICompileUnit::getSubprograms() const {
if (!DbgNode || DbgNode->getNumOperands() < 13)
return DIArray();
return DIArray(getNodeField(DbgNode, 9));
}
DIArray DICompileUnit::getGlobalVariables() const {
if (!DbgNode || DbgNode->getNumOperands() < 13)
return DIArray();
return DIArray(getNodeField(DbgNode, 10));
}
DIArray DICompileUnit::getImportedEntities() const {
if (!DbgNode || DbgNode->getNumOperands() < 13)
return DIArray();
return DIArray(getNodeField(DbgNode, 11));
}
/// fixupSubprogramName - Replace contains special characters used
/// in a typical Objective-C names with '.' in a given string.
static void fixupSubprogramName(DISubprogram Fn, SmallVectorImpl<char> &Out) {
StringRef FName =
Fn.getFunction() ? Fn.getFunction()->getName() : Fn.getName();
FName = Function::getRealLinkageName(FName);
StringRef Prefix("llvm.dbg.lv.");
Out.reserve(FName.size() + Prefix.size());
Out.append(Prefix.begin(), Prefix.end());
bool isObjCLike = false;
for (size_t i = 0, e = FName.size(); i < e; ++i) {
char C = FName[i];
if (C == '[')
isObjCLike = true;
if (isObjCLike && (C == '[' || C == ']' || C == ' ' || C == ':' ||
C == '+' || C == '(' || C == ')'))
Out.push_back('.');
else
Out.push_back(C);
}
}
/// getFnSpecificMDNode - Return a NameMDNode, if available, that is
/// suitable to hold function specific information.
NamedMDNode *llvm::getFnSpecificMDNode(const Module &M, DISubprogram Fn) {
SmallString<32> Name;
fixupSubprogramName(Fn, Name);
return M.getNamedMetadata(Name.str());
}
/// getOrInsertFnSpecificMDNode - Return a NameMDNode that is suitable
/// to hold function specific information.
NamedMDNode *llvm::getOrInsertFnSpecificMDNode(Module &M, DISubprogram Fn) {
SmallString<32> Name;
fixupSubprogramName(Fn, Name);
return M.getOrInsertNamedMetadata(Name.str());
}
/// createInlinedVariable - Create a new inlined variable based on current
/// variable.
/// @param DV Current Variable.
/// @param InlinedScope Location at current variable is inlined.
DIVariable llvm::createInlinedVariable(MDNode *DV, MDNode *InlinedScope,
LLVMContext &VMContext) {
SmallVector<Value *, 16> Elts;
// Insert inlined scope as 7th element.
for (unsigned i = 0, e = DV->getNumOperands(); i != e; ++i)
i == 7 ? Elts.push_back(InlinedScope) :
Elts.push_back(DV->getOperand(i));
return DIVariable(MDNode::get(VMContext, Elts));
}
/// cleanseInlinedVariable - Remove inlined scope from the variable.
DIVariable llvm::cleanseInlinedVariable(MDNode *DV, LLVMContext &VMContext) {
SmallVector<Value *, 16> Elts;
// Insert inlined scope as 7th element.
for (unsigned i = 0, e = DV->getNumOperands(); i != e; ++i)
i == 7 ?
Elts.push_back(Constant::getNullValue(Type::getInt32Ty(VMContext))):
Elts.push_back(DV->getOperand(i));
return DIVariable(MDNode::get(VMContext, Elts));
}
/// getDISubprogram - Find subprogram that is enclosing this scope.
DISubprogram llvm::getDISubprogram(const MDNode *Scope) {
DIDescriptor D(Scope);
if (D.isSubprogram())
return DISubprogram(Scope);
if (D.isLexicalBlockFile())
return getDISubprogram(DILexicalBlockFile(Scope).getContext());
if (D.isLexicalBlock())
return getDISubprogram(DILexicalBlock(Scope).getContext());
return DISubprogram();
}
/// getDICompositeType - Find underlying composite type.
DICompositeType llvm::getDICompositeType(DIType T) {
if (T.isCompositeType())
return DICompositeType(T);
if (T.isDerivedType())
return getDICompositeType(DIDerivedType(T).getTypeDerivedFrom());
return DICompositeType();
}
/// isSubprogramContext - Return true if Context is either a subprogram
/// or another context nested inside a subprogram.
bool llvm::isSubprogramContext(const MDNode *Context) {
if (!Context)
return false;
DIDescriptor D(Context);
if (D.isSubprogram())
return true;
if (D.isType())
return isSubprogramContext(DIType(Context).getContext());
return false;
}
//===----------------------------------------------------------------------===//
// DebugInfoFinder implementations.
//===----------------------------------------------------------------------===//
void DebugInfoFinder::reset() {
CUs.clear();
SPs.clear();
GVs.clear();
TYs.clear();
Scopes.clear();
NodesSeen.clear();
}
/// processModule - Process entire module and collect debug info.
void DebugInfoFinder::processModule(const Module &M) {
if (NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu")) {
for (unsigned i = 0, e = CU_Nodes->getNumOperands(); i != e; ++i) {
DICompileUnit CU(CU_Nodes->getOperand(i));
addCompileUnit(CU);
DIArray GVs = CU.getGlobalVariables();
for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i) {
DIGlobalVariable DIG(GVs.getElement(i));
if (addGlobalVariable(DIG)) {
processScope(DIG.getContext());
processType(DIG.getType());
}
}
DIArray SPs = CU.getSubprograms();
for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i)
processSubprogram(DISubprogram(SPs.getElement(i)));
DIArray EnumTypes = CU.getEnumTypes();
for (unsigned i = 0, e = EnumTypes.getNumElements(); i != e; ++i)
processType(DIType(EnumTypes.getElement(i)));
DIArray RetainedTypes = CU.getRetainedTypes();
for (unsigned i = 0, e = RetainedTypes.getNumElements(); i != e; ++i)
processType(DIType(RetainedTypes.getElement(i)));
// FIXME: We really shouldn't be bailing out after visiting just one CU
return;
}
}
}
/// processLocation - Process DILocation.
void DebugInfoFinder::processLocation(DILocation Loc) {
if (!Loc) return;
processScope(Loc.getScope());
processLocation(Loc.getOrigLocation());
}
/// processType - Process DIType.
void DebugInfoFinder::processType(DIType DT) {
if (!addType(DT))
return;
processScope(DT.getContext());
if (DT.isCompositeType()) {
DICompositeType DCT(DT);
processType(DCT.getTypeDerivedFrom());
DIArray DA = DCT.getTypeArray();
for (unsigned i = 0, e = DA.getNumElements(); i != e; ++i) {
DIDescriptor D = DA.getElement(i);
if (D.isType())
processType(DIType(D));
else if (D.isSubprogram())
processSubprogram(DISubprogram(D));
}
} else if (DT.isDerivedType()) {
DIDerivedType DDT(DT);
processType(DDT.getTypeDerivedFrom());
}
}
void DebugInfoFinder::processScope(DIScope Scope) {
if (Scope.isType()) {
DIType Ty(Scope);
processType(Ty);
return;
}
if (Scope.isCompileUnit()) {
addCompileUnit(DICompileUnit(Scope));
return;
}
if (Scope.isSubprogram()) {
processSubprogram(DISubprogram(Scope));
return;
}
if (!addScope(Scope))
return;
if (Scope.isLexicalBlock()) {
DILexicalBlock LB(Scope);
processScope(LB.getContext());
} else if (Scope.isLexicalBlockFile()) {
DILexicalBlockFile LBF = DILexicalBlockFile(Scope);
processScope(LBF.getScope());
} else if (Scope.isNameSpace()) {
DINameSpace NS(Scope);
processScope(NS.getContext());
}
}
/// processLexicalBlock
void DebugInfoFinder::processLexicalBlock(DILexicalBlock LB) {
DIScope Context = LB.getContext();
if (Context.isLexicalBlock())
return processLexicalBlock(DILexicalBlock(Context));
else if (Context.isLexicalBlockFile()) {
DILexicalBlockFile DBF = DILexicalBlockFile(Context);
return processLexicalBlock(DILexicalBlock(DBF.getScope()));
}
else
return processSubprogram(DISubprogram(Context));
}
/// processSubprogram - Process DISubprogram.
void DebugInfoFinder::processSubprogram(DISubprogram SP) {
if (!addSubprogram(SP))
return;
processScope(SP.getContext());
processType(SP.getType());
}
/// processDeclare - Process DbgDeclareInst.
void DebugInfoFinder::processDeclare(const DbgDeclareInst *DDI) {
MDNode *N = dyn_cast<MDNode>(DDI->getVariable());
if (!N) return;
DIDescriptor DV(N);
if (!DV.isVariable())
return;
if (!NodesSeen.insert(DV))
return;
processScope(DIVariable(N).getContext());
processType(DIVariable(N).getType());
}
void DebugInfoFinder::processValue(const DbgValueInst *DVI) {
MDNode *N = dyn_cast<MDNode>(DVI->getVariable());
if (!N) return;
DIDescriptor DV(N);
if (!DV.isVariable())
return;
if (!NodesSeen.insert(DV))
return;
processScope(DIVariable(N).getContext());
processType(DIVariable(N).getType());
}
/// addType - Add type into Tys.
bool DebugInfoFinder::addType(DIType DT) {
if (!DT)
return false;
if (!NodesSeen.insert(DT))
return false;
TYs.push_back(DT);
return true;
}
/// addCompileUnit - Add compile unit into CUs.
bool DebugInfoFinder::addCompileUnit(DICompileUnit CU) {
if (!CU)
return false;
if (!NodesSeen.insert(CU))
return false;
CUs.push_back(CU);
return true;
}
/// addGlobalVariable - Add global variable into GVs.
bool DebugInfoFinder::addGlobalVariable(DIGlobalVariable DIG) {
if (!DIG)
return false;
if (!NodesSeen.insert(DIG))
return false;
GVs.push_back(DIG);
return true;
}
// addSubprogram - Add subprgoram into SPs.
bool DebugInfoFinder::addSubprogram(DISubprogram SP) {
if (!SP)
return false;
if (!NodesSeen.insert(SP))
return false;
SPs.push_back(SP);
return true;
}
bool DebugInfoFinder::addScope(DIScope Scope) {
if (!Scope)
return false;
// FIXME: Ocaml binding generates a scope with no content, we treat it
// as null for now.
if (Scope->getNumOperands() == 0)
return false;
if (!NodesSeen.insert(Scope))
return false;
Scopes.push_back(Scope);
return true;
}
//===----------------------------------------------------------------------===//
// DIDescriptor: dump routines for all descriptors.
//===----------------------------------------------------------------------===//
/// dump - Print descriptor to dbgs() with a newline.
void DIDescriptor::dump() const {
print(dbgs()); dbgs() << '\n';
}
/// print - Print descriptor.
void DIDescriptor::print(raw_ostream &OS) const {
if (!DbgNode) return;
if (const char *Tag = dwarf::TagString(getTag()))
OS << "[ " << Tag << " ]";
if (this->isSubrange()) {
DISubrange(DbgNode).printInternal(OS);
} else if (this->isCompileUnit()) {
DICompileUnit(DbgNode).printInternal(OS);
} else if (this->isFile()) {
DIFile(DbgNode).printInternal(OS);
} else if (this->isEnumerator()) {
DIEnumerator(DbgNode).printInternal(OS);
} else if (this->isBasicType()) {
DIType(DbgNode).printInternal(OS);
} else if (this->isDerivedType()) {
DIDerivedType(DbgNode).printInternal(OS);
} else if (this->isCompositeType()) {
DICompositeType(DbgNode).printInternal(OS);
} else if (this->isSubprogram()) {
DISubprogram(DbgNode).printInternal(OS);
} else if (this->isGlobalVariable()) {
DIGlobalVariable(DbgNode).printInternal(OS);
} else if (this->isVariable()) {
DIVariable(DbgNode).printInternal(OS);
} else if (this->isObjCProperty()) {
DIObjCProperty(DbgNode).printInternal(OS);
} else if (this->isNameSpace()) {
DINameSpace(DbgNode).printInternal(OS);
} else if (this->isScope()) {
DIScope(DbgNode).printInternal(OS);
}
}
void DISubrange::printInternal(raw_ostream &OS) const {
int64_t Count = getCount();
if (Count != -1)
OS << " [" << getLo() << ", " << Count - 1 << ']';
else
OS << " [unbounded]";
}
void DIScope::printInternal(raw_ostream &OS) const {
OS << " [" << getDirectory() << "/" << getFilename() << ']';
}
void DICompileUnit::printInternal(raw_ostream &OS) const {
DIScope::printInternal(OS);
OS << " [";
unsigned Lang = getLanguage();
if (const char *LangStr = dwarf::LanguageString(Lang))
OS << LangStr;
else
(OS << "lang 0x").write_hex(Lang);
OS << ']';
}
void DIEnumerator::printInternal(raw_ostream &OS) const {
OS << " [" << getName() << " :: " << getEnumValue() << ']';
}
void DIType::printInternal(raw_ostream &OS) const {
if (!DbgNode) return;
StringRef Res = getName();
if (!Res.empty())
OS << " [" << Res << "]";
// TODO: Print context?
OS << " [line " << getLineNumber()
<< ", size " << getSizeInBits()
<< ", align " << getAlignInBits()
<< ", offset " << getOffsetInBits();
if (isBasicType())
if (const char *Enc =
dwarf::AttributeEncodingString(DIBasicType(DbgNode).getEncoding()))
OS << ", enc " << Enc;
OS << "]";
if (isPrivate())
OS << " [private]";
else if (isProtected())
OS << " [protected]";
if (isArtificial())
OS << " [artificial]";
if (isForwardDecl())
OS << " [decl]";
else if (getTag() == dwarf::DW_TAG_structure_type ||
getTag() == dwarf::DW_TAG_union_type ||
getTag() == dwarf::DW_TAG_enumeration_type ||
getTag() == dwarf::DW_TAG_class_type)
OS << " [def]";
if (isVector())
OS << " [vector]";
if (isStaticMember())
OS << " [static]";
}
void DIDerivedType::printInternal(raw_ostream &OS) const {
DIType::printInternal(OS);
OS << " [from " << getTypeDerivedFrom().getName() << ']';
}
void DICompositeType::printInternal(raw_ostream &OS) const {
DIType::printInternal(OS);
DIArray A = getTypeArray();
OS << " [" << A.getNumElements() << " elements]";
}
void DINameSpace::printInternal(raw_ostream &OS) const {
StringRef Name = getName();
if (!Name.empty())
OS << " [" << Name << ']';
OS << " [line " << getLineNumber() << ']';
}
void DISubprogram::printInternal(raw_ostream &OS) const {
// TODO : Print context
OS << " [line " << getLineNumber() << ']';
if (isLocalToUnit())
OS << " [local]";
if (isDefinition())
OS << " [def]";
if (getScopeLineNumber() != getLineNumber())
OS << " [scope " << getScopeLineNumber() << "]";
if (isPrivate())
OS << " [private]";
else if (isProtected())
OS << " [protected]";
StringRef Res = getName();
if (!Res.empty())
OS << " [" << Res << ']';
}
void DIGlobalVariable::printInternal(raw_ostream &OS) const {
StringRef Res = getName();
if (!Res.empty())
OS << " [" << Res << ']';
OS << " [line " << getLineNumber() << ']';
// TODO : Print context
if (isLocalToUnit())
OS << " [local]";
if (isDefinition())
OS << " [def]";
}
void DIVariable::printInternal(raw_ostream &OS) const {
StringRef Res = getName();
if (!Res.empty())
OS << " [" << Res << ']';
OS << " [line " << getLineNumber() << ']';
}
void DIObjCProperty::printInternal(raw_ostream &OS) const {
StringRef Name = getObjCPropertyName();
if (!Name.empty())
OS << " [" << Name << ']';
OS << " [line " << getLineNumber()
<< ", properties " << getUnsignedField(6) << ']';
}
static void printDebugLoc(DebugLoc DL, raw_ostream &CommentOS,
const LLVMContext &Ctx) {
if (!DL.isUnknown()) { // Print source line info.
DIScope Scope(DL.getScope(Ctx));
assert(Scope.isScope() &&
"Scope of a DebugLoc should be a DIScope.");
// Omit the directory, because it's likely to be long and uninteresting.
CommentOS << Scope.getFilename();
CommentOS << ':' << DL.getLine();
if (DL.getCol() != 0)
CommentOS << ':' << DL.getCol();
DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx));
if (!InlinedAtDL.isUnknown()) {
CommentOS << " @[ ";
printDebugLoc(InlinedAtDL, CommentOS, Ctx);
CommentOS << " ]";
}
}
}
void DIVariable::printExtendedName(raw_ostream &OS) const {
const LLVMContext &Ctx = DbgNode->getContext();
StringRef Res = getName();
if (!Res.empty())
OS << Res << "," << getLineNumber();
if (MDNode *InlinedAt = getInlinedAt()) {
DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt);
if (!InlinedAtDL.isUnknown()) {
OS << " @[";
printDebugLoc(InlinedAtDL, OS, Ctx);
OS << "]";
}
}
}
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