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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/IR/DebugInfo.h"
#include "LLVMContextImpl.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/DIBuilder.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/IR/ValueHandle.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.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 || Elt >= DbgNode->getNumOperands())
return nullptr;
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)
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)
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)
return nullptr;
if (Elt < DbgNode->getNumOperands())
return dyn_cast_or_null<GlobalVariable>(DbgNode->getOperand(Elt));
return nullptr;
}
Constant *DIDescriptor::getConstantField(unsigned Elt) const {
if (!DbgNode)
return nullptr;
if (Elt < DbgNode->getNumOperands())
return dyn_cast_or_null<Constant>(DbgNode->getOperand(Elt));
return nullptr;
}
Function *DIDescriptor::getFunctionField(unsigned Elt) const {
if (!DbgNode)
return nullptr;
if (Elt < DbgNode->getNumOperands())
return dyn_cast_or_null<Function>(DbgNode->getOperand(Elt));
return nullptr;
}
void DIDescriptor::replaceFunctionField(unsigned Elt, Function *F) {
if (!DbgNode)
return;
if (Elt < DbgNode->getNumOperands()) {
MDNode *Node = const_cast<MDNode *>(DbgNode);
Node->replaceOperandWith(Elt, F);
}
}
uint64_t DIVariable::getAddrElement(unsigned Idx) const {
DIDescriptor ComplexExpr = getDescriptorField(8);
if (Idx < ComplexExpr->getNumOperands())
if (auto *CI = dyn_cast_or_null<ConstantInt>(ComplexExpr->getOperand(Idx)))
return CI->getZExtValue();
assert(false && "non-existing complex address element requested");
return 0;
}
/// getInlinedAt - If this variable is inlined then return inline location.
MDNode *DIVariable::getInlinedAt() const { return getNodeField(DbgNode, 7); }
bool DIVariable::isVariablePiece() const {
return hasComplexAddress() && getAddrElement(0) == DIBuilder::OpPiece;
}
uint64_t DIVariable::getPieceOffset() const {
assert(isVariablePiece());
return getAddrElement(1);
}
uint64_t DIVariable::getPieceSize() const {
assert(isVariablePiece());
return getAddrElement(2);
}
/// Return the size reported by the variable's type.
unsigned DIVariable::getSizeInBits(const DITypeIdentifierMap &Map) {
DIType Ty = getType().resolve(Map);
// Follow derived types until we reach a type that
// reports back a size.
while (Ty.isDerivedType() && !Ty.getSizeInBits()) {
DIDerivedType DT(&*Ty);
Ty = DT.getTypeDerivedFrom().resolve(Map);
}
assert(Ty.getSizeInBits() && "type with size 0");
return Ty.getSizeInBits();
}
//===----------------------------------------------------------------------===//
// Predicates
//===----------------------------------------------------------------------===//
bool DIDescriptor::isSubroutineType() const {
return isCompositeType() && getTag() == dwarf::DW_TAG_subroutine_type;
}
/// 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);
}
/// 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:
case dwarf::DW_TAG_file_type:
return true;
default:
break;
}
return isType();
}
/// 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() == 4);
}
/// 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
//===----------------------------------------------------------------------===//
/// replaceAllUsesWith - Replace all uses of the MDNode used by this
/// type with the one in the passed descriptor.
void DIDescriptor::replaceAllUsesWith(LLVMContext &VMContext, 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.
const MDNode *DN = D;
if (DbgNode == DN) {
SmallVector<Value*, 10> Ops(DbgNode->getNumOperands());
for (size_t i = 0; i != Ops.size(); ++i)
Ops[i] = DbgNode->getOperand(i);
DN = MDNode::get(VMContext, Ops);
}
MDNode *Node = const_cast<MDNode *>(DbgNode);
const Value *V = cast_or_null<Value>(DN);
Node->replaceAllUsesWith(const_cast<Value *>(V));
MDNode::deleteTemporary(Node);
DbgNode = DN;
}
/// replaceAllUsesWith - Replace all uses of the MDNode used by this
/// type with the one in D.
void DIDescriptor::replaceAllUsesWith(MDNode *D) {
assert(DbgNode && "Trying to replace an unverified type!");
assert(DbgNode != D && "This replacement should always happen");
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);
}
/// 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() == 14;
}
/// 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;
}
/// Check if a field at position Elt of a MDNode is a MDString.
static bool fieldIsMDString(const MDNode *DbgNode, unsigned Elt) {
Value *Fld = getField(DbgNode, Elt);
return !Fld || isa<MDString>(Fld);
}
/// Check if a value can be a reference to a type.
static bool isTypeRef(const Value *Val) {
return !Val ||
(isa<MDString>(Val) && !cast<MDString>(Val)->getString().empty()) ||
(isa<MDNode>(Val) && DIType(cast<MDNode>(Val)).isType());
}
/// Check if a field at position Elt of a MDNode can be a reference to a type.
static bool fieldIsTypeRef(const MDNode *DbgNode, unsigned Elt) {
Value *Fld = getField(DbgNode, Elt);
return isTypeRef(Fld);
}
/// Check if a value can be a ScopeRef.
static bool isScopeRef(const Value *Val) {
return !Val ||
(isa<MDString>(Val) && !cast<MDString>(Val)->getString().empty()) ||
// Not checking for Val->isScope() here, because it would work
// only for lexical scopes and not all subclasses of DIScope.
isa<MDNode>(Val);
}
/// Check if a field at position Elt of a MDNode can be a ScopeRef.
static bool fieldIsScopeRef(const MDNode *DbgNode, unsigned Elt) {
Value *Fld = getField(DbgNode, Elt);
return isScopeRef(Fld);
}
/// 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 (!fieldIsScopeRef(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())
return DIBasicType(DbgNode).Verify();
else if (isCompositeType())
return DICompositeType(DbgNode).Verify();
else if (isDerivedType())
return DIDerivedType(DbgNode).Verify();
else
return false;
}
/// 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 TypeRef.
if (!fieldIsTypeRef(DbgNode, 9))
return false;
if (getTag() == dwarf::DW_TAG_ptr_to_member_type)
// Make sure ClassType @ field 10 is a TypeRef.
if (!fieldIsTypeRef(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 TypeRef.
if (!fieldIsTypeRef(DbgNode, 9))
return false;
if (!fieldIsTypeRef(DbgNode, 12))
return false;
// Make sure the type identifier at field 14 is MDString, it can be null.
if (!fieldIsMDString(DbgNode, 14))
return false;
// A subroutine type can't be both & and &&.
if (isLValueReference() && isRValueReference())
return false;
return DbgNode->getNumOperands() == 15;
}
/// Verify - Verify that a subprogram descriptor is well formed.
bool DISubprogram::Verify() const {
if (!isSubprogram())
return false;
// Make sure context @ field 2 is a ScopeRef and type @ field 7 is a MDNode.
if (!fieldIsScopeRef(DbgNode, 2))
return false;
if (!fieldIsMDNode(DbgNode, 7))
return false;
// Containing type @ field 12.
if (!fieldIsTypeRef(DbgNode, 12))
return false;
// A subprogram can't be both & and &&.
if (isLValueReference() && isRValueReference())
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 is an MDNode.
if (!fieldIsMDNode(DbgNode, 2))
return false;
// Make sure that type @ field 8 is a DITypeRef.
if (!fieldIsTypeRef(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 is an MDNode.
if (!fieldIsMDNode(DbgNode, 1))
return false;
// Make sure that type @ field 5 is a DITypeRef.
if (!fieldIsTypeRef(DbgNode, 5))
return false;
// Variable without a complex expression.
if (DbgNode->getNumOperands() == 8)
return true;
// Make sure the complex expression is an MDNode.
return (DbgNode->getNumOperands() == 9 && fieldIsMDNode(DbgNode, 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() == 4;
}
/// \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);
}
/// getObjCProperty - Return property node, if this ivar is associated with one.
MDNode *DIDerivedType::getObjCProperty() const {
return getNodeField(DbgNode, 10);
}
MDString *DICompositeType::getIdentifier() const {
return cast_or_null<MDString>(getField(DbgNode, 14));
}
#ifndef NDEBUG
static void VerifySubsetOf(const MDNode *LHS, const MDNode *RHS) {
for (unsigned i = 0; i != LHS->getNumOperands(); ++i) {
// Skip the 'empty' list (that's a single i32 0, rather than truly empty).
if (i == 0 && isa<ConstantInt>(LHS->getOperand(i)))
continue;
const MDNode *E = cast<MDNode>(LHS->getOperand(i));
bool found = false;
for (unsigned j = 0; !found && j != RHS->getNumOperands(); ++j)
found = E == RHS->getOperand(j);
assert(found && "Losing a member during member list replacement");
}
}
#endif
/// \brief Set the array of member DITypes.
void DICompositeType::setArraysHelper(MDNode *Elements, MDNode *TParams) {
TrackingVH<MDNode> N(*this);
if (Elements) {
#ifndef NDEBUG
// Check that the new list of members contains all the old members as well.
if (const MDNode *El = cast_or_null<MDNode>(N->getOperand(10)))
VerifySubsetOf(El, Elements);
#endif
N->replaceOperandWith(10, Elements);
}
if (TParams)
N->replaceOperandWith(13, TParams);
DbgNode = N;
}
/// Generate a reference to this DIType. Uses the type identifier instead
/// of the actual MDNode if possible, to help type uniquing.
DIScopeRef DIScope::getRef() const {
if (!isCompositeType())
return DIScopeRef(*this);
DICompositeType DTy(DbgNode);
if (!DTy.getIdentifier())
return DIScopeRef(*this);
return DIScopeRef(DTy.getIdentifier());
}
/// \brief Set the containing type.
void DICompositeType::setContainingType(DICompositeType ContainingType) {
TrackingVH<MDNode> N(*this);
N->replaceOperandWith(12, ContainingType.getRef());
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.
DIScopeRef DIScope::getContext() const {
if (isType())
return DIType(DbgNode).getContext();
if (isSubprogram())
return DIScopeRef(DISubprogram(DbgNode).getContext());
if (isLexicalBlock())
return DIScopeRef(DILexicalBlock(DbgNode).getContext());
if (isLexicalBlockFile())
return DIScopeRef(DILexicalBlockFile(DbgNode).getContext());
if (isNameSpace())
return DIScopeRef(DINameSpace(DbgNode).getContext());
assert((isFile() || isCompileUnit()) && "Unhandled type of scope.");
return DIScopeRef(nullptr);
}
// If the scope node has a name, return that, else return an empty string.
StringRef DIScope::getName() const {
if (isType())
return DIType(DbgNode).getName();
if (isSubprogram())
return DISubprogram(DbgNode).getName();
if (isNameSpace())
return DINameSpace(DbgNode).getName();
assert((isLexicalBlock() || isLexicalBlockFile() || isFile() ||
isCompileUnit()) &&
"Unhandled type of scope.");
return StringRef();
}
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));
}
/// copyWithNewScope - Return a copy of this location, replacing the
/// current scope with the given one.
DILocation DILocation::copyWithNewScope(LLVMContext &Ctx,
DILexicalBlockFile NewScope) {
SmallVector<Value *, 10> Elts;
assert(Verify());
for (unsigned I = 0; I < DbgNode->getNumOperands(); ++I) {
if (I != 2)
Elts.push_back(DbgNode->getOperand(I));
else
Elts.push_back(NewScope);
}
MDNode *NewDIL = MDNode::get(Ctx, Elts);
return DILocation(NewDIL);
}
/// computeNewDiscriminator - Generate a new discriminator value for this
/// file and line location.
unsigned DILocation::computeNewDiscriminator(LLVMContext &Ctx) {
std::pair<const char *, unsigned> Key(getFilename().data(), getLineNumber());
return ++Ctx.pImpl->DiscriminatorTable[Key];
}
/// 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));
}
/// getEntireVariable - Remove OpPiece exprs from the variable.
DIVariable llvm::getEntireVariable(DIVariable DV) {
if (!DV.isVariablePiece())
return DV;
SmallVector<Value *, 8> Elts;
for (unsigned i = 0; i < 8; ++i)
Elts.push_back(DV->getOperand(i));
return DIVariable(MDNode::get(DV->getContext(), 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()) {
// This function is currently used by dragonegg and dragonegg does
// not generate identifier for types, so using an empty map to resolve
// DerivedFrom should be fine.
DITypeIdentifierMap EmptyMap;
return getDICompositeType(
DIDerivedType(T).getTypeDerivedFrom().resolve(EmptyMap));
}
return DICompositeType();
}
/// Update DITypeIdentifierMap by going through retained types of each CU.
DITypeIdentifierMap
llvm::generateDITypeIdentifierMap(const NamedMDNode *CU_Nodes) {
DITypeIdentifierMap Map;
for (unsigned CUi = 0, CUe = CU_Nodes->getNumOperands(); CUi != CUe; ++CUi) {
DICompileUnit CU(CU_Nodes->getOperand(CUi));
DIArray Retain = CU.getRetainedTypes();
for (unsigned Ti = 0, Te = Retain.getNumElements(); Ti != Te; ++Ti) {
if (!Retain.getElement(Ti).isCompositeType())
continue;
DICompositeType Ty(Retain.getElement(Ti));
if (MDString *TypeId = Ty.getIdentifier()) {
// Definition has priority over declaration.
// Try to insert (TypeId, Ty) to Map.
std::pair<DITypeIdentifierMap::iterator, bool> P =
Map.insert(std::make_pair(TypeId, Ty));
// If TypeId already exists in Map and this is a definition, replace