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

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//===--- DIBuilder.cpp - Debug Information Builder ------------------------===//
//
// 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 DIBuilder.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/DIBuilder.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Dwarf.h"
using namespace llvm;
using namespace llvm::dwarf;
namespace {
class HeaderBuilder {
/// \brief Whether there are any fields yet.
///
/// Note that this is not equivalent to \c Chars.empty(), since \a concat()
/// may have been called already with an empty string.
bool IsEmpty;
SmallVector<char, 256> Chars;
public:
HeaderBuilder() : IsEmpty(true) {}
HeaderBuilder(const HeaderBuilder &X) : IsEmpty(X.IsEmpty), Chars(X.Chars) {}
HeaderBuilder(HeaderBuilder &&X)
: IsEmpty(X.IsEmpty), Chars(std::move(X.Chars)) {}
template <class Twineable> HeaderBuilder &concat(Twineable &&X) {
if (IsEmpty)
IsEmpty = false;
else
Chars.push_back(0);
Twine(X).toVector(Chars);
return *this;
}
MDString *get(LLVMContext &Context) const {
return MDString::get(Context, StringRef(Chars.begin(), Chars.size()));
}
static HeaderBuilder get(unsigned Tag) {
return HeaderBuilder().concat("0x" + Twine::utohexstr(Tag));
}
};
}
DIBuilder::DIBuilder(Module &m, bool AllowUnresolvedNodes)
: M(m), VMContext(M.getContext()), TempEnumTypes(nullptr),
TempRetainTypes(nullptr), TempSubprograms(nullptr), TempGVs(nullptr),
DeclareFn(nullptr), ValueFn(nullptr),
AllowUnresolvedNodes(AllowUnresolvedNodes) {}
void DIBuilder::trackIfUnresolved(MDNode *N) {
if (!N)
return;
if (N->isResolved())
return;
assert(AllowUnresolvedNodes && "Cannot handle unresolved nodes");
UnresolvedNodes.emplace_back(N);
}
void DIBuilder::finalize() {
DIArray Enums = getOrCreateArray(AllEnumTypes);
DIType(TempEnumTypes).replaceAllUsesWith(Enums);
SmallVector<Metadata *, 16> RetainValues;
// Declarations and definitions of the same type may be retained. Some
// clients RAUW these pairs, leaving duplicates in the retained types
// list. Use a set to remove the duplicates while we transform the
// TrackingVHs back into Values.
SmallPtrSet<Metadata *, 16> RetainSet;
for (unsigned I = 0, E = AllRetainTypes.size(); I < E; I++)
if (RetainSet.insert(AllRetainTypes[I]).second)
RetainValues.push_back(AllRetainTypes[I]);
DIArray RetainTypes = getOrCreateArray(RetainValues);
DIType(TempRetainTypes).replaceAllUsesWith(RetainTypes);
DIArray SPs = getOrCreateArray(AllSubprograms);
DIType(TempSubprograms).replaceAllUsesWith(SPs);
for (unsigned i = 0, e = SPs.getNumElements(); i != e; ++i) {
DISubprogram SP(SPs.getElement(i));
if (MDNode *Temp = SP.getVariablesNodes()) {
const auto &PV = PreservedVariables.lookup(SP);
SmallVector<Metadata *, 4> Variables(PV.begin(), PV.end());
DIArray AV = getOrCreateArray(Variables);
DIType(Temp).replaceAllUsesWith(AV);
}
}
DIArray GVs = getOrCreateArray(AllGVs);
DIType(TempGVs).replaceAllUsesWith(GVs);
SmallVector<Metadata *, 16> RetainValuesI(AllImportedModules.begin(),
AllImportedModules.end());
DIArray IMs = getOrCreateArray(RetainValuesI);
DIType(TempImportedModules).replaceAllUsesWith(IMs);
// Now that all temp nodes have been replaced or deleted, resolve remaining
// cycles.
for (const auto &N : UnresolvedNodes)
if (N && !N->isResolved())
N->resolveCycles();
UnresolvedNodes.clear();
// Can't handle unresolved nodes anymore.
AllowUnresolvedNodes = false;
}
/// If N is compile unit return NULL otherwise return N.
static MDNode *getNonCompileUnitScope(MDNode *N) {
if (DIDescriptor(N).isCompileUnit())
return nullptr;
return N;
}
DICompileUnit DIBuilder::createCompileUnit(unsigned Lang, StringRef Filename,
StringRef Directory,
StringRef Producer, bool isOptimized,
StringRef Flags, unsigned RunTimeVer,
StringRef SplitName,
DebugEmissionKind Kind,
bool EmitDebugInfo) {
assert(((Lang <= dwarf::DW_LANG_Fortran08 && Lang >= dwarf::DW_LANG_C89) ||
(Lang <= dwarf::DW_LANG_hi_user && Lang >= dwarf::DW_LANG_lo_user)) &&
"Invalid Language tag");
assert(!Filename.empty() &&
"Unable to create compile unit without filename");
// TODO: Once we make MDCompileUnit distinct, stop using temporaries here
// (just start with operands assigned to nullptr).
TempEnumTypes = MDTuple::getTemporary(VMContext, None).release();
TempRetainTypes = MDTuple::getTemporary(VMContext, None).release();
TempSubprograms = MDTuple::getTemporary(VMContext, None).release();
TempGVs = MDTuple::getTemporary(VMContext, None).release();
TempImportedModules = MDTuple::getTemporary(VMContext, None).release();
// TODO: Switch to getDistinct(). We never want to merge compile units based
// on contents.
MDNode *CUNode = MDCompileUnit::get(
VMContext, Lang, MDFile::get(VMContext, Filename, Directory), Producer,
isOptimized, Flags, RunTimeVer, SplitName, Kind, TempEnumTypes,
TempRetainTypes, TempSubprograms, TempGVs, TempImportedModules);
// Create a named metadata so that it is easier to find cu in a module.
// Note that we only generate this when the caller wants to actually
// emit debug information. When we are only interested in tracking
// source line locations throughout the backend, we prevent codegen from
// emitting debug info in the final output by not generating llvm.dbg.cu.
if (EmitDebugInfo) {
NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.cu");
NMD->addOperand(CUNode);
}
trackIfUnresolved(CUNode);
return DICompileUnit(CUNode);
}
static DIImportedEntity
createImportedModule(LLVMContext &C, dwarf::Tag Tag, DIScope Context,
Metadata *NS, unsigned Line, StringRef Name,
SmallVectorImpl<TrackingMDNodeRef> &AllImportedModules) {
DIImportedEntity M = MDImportedEntity::get(C, Tag, Context, NS, Line, Name);
assert(M.Verify() && "Imported module should be valid");
AllImportedModules.emplace_back(M.get());
return M;
}
DIImportedEntity DIBuilder::createImportedModule(DIScope Context,
DINameSpace NS,
unsigned Line) {
return ::createImportedModule(VMContext, dwarf::DW_TAG_imported_module,
Context, NS, Line, StringRef(), AllImportedModules);
}
DIImportedEntity DIBuilder::createImportedModule(DIScope Context,
DIImportedEntity NS,
unsigned Line) {
return ::createImportedModule(VMContext, dwarf::DW_TAG_imported_module,
Context, NS, Line, StringRef(), AllImportedModules);
}
DIImportedEntity DIBuilder::createImportedDeclaration(DIScope Context,
DIDescriptor Decl,
unsigned Line, StringRef Name) {
// Make sure to use the unique identifier based metadata reference for
// types that have one.
Metadata *V =
Decl.isType() ? static_cast<Metadata *>(DIType(Decl).getRef()) : Decl;
return ::createImportedModule(VMContext, dwarf::DW_TAG_imported_declaration,
Context, V, Line, Name,
AllImportedModules);
}
DIImportedEntity DIBuilder::createImportedDeclaration(DIScope Context,
DIImportedEntity Imp,
unsigned Line, StringRef Name) {
return ::createImportedModule(VMContext, dwarf::DW_TAG_imported_declaration,
Context, Imp, Line, Name, AllImportedModules);
}
DIFile DIBuilder::createFile(StringRef Filename, StringRef Directory) {
return MDFile::get(VMContext, Filename, Directory);
}
DIEnumerator DIBuilder::createEnumerator(StringRef Name, int64_t Val) {
assert(!Name.empty() && "Unable to create enumerator without name");
return MDEnumerator::get(VMContext, Val, Name);
}
DIBasicType DIBuilder::createUnspecifiedType(StringRef Name) {
assert(!Name.empty() && "Unable to create type without name");
return MDBasicType::get(VMContext, dwarf::DW_TAG_unspecified_type, Name);
}
DIBasicType DIBuilder::createNullPtrType() {
return createUnspecifiedType("decltype(nullptr)");
}
DIBasicType
DIBuilder::createBasicType(StringRef Name, uint64_t SizeInBits,
uint64_t AlignInBits, unsigned Encoding) {
assert(!Name.empty() && "Unable to create type without name");
return MDBasicType::get(VMContext, dwarf::DW_TAG_base_type, Name, SizeInBits,
AlignInBits, Encoding);
}
DIDerivedType DIBuilder::createQualifiedType(unsigned Tag, DIType FromTy) {
return MDDerivedType::get(VMContext, Tag, "", nullptr, 0, nullptr,
FromTy.getRef(), 0, 0, 0, 0);
}
DIDerivedType
DIBuilder::createPointerType(DIType PointeeTy, uint64_t SizeInBits,
uint64_t AlignInBits, StringRef Name) {
// FIXME: Why is there a name here?
return MDDerivedType::get(VMContext, dwarf::DW_TAG_pointer_type, Name,
nullptr, 0, nullptr, PointeeTy.getRef(), SizeInBits,
AlignInBits, 0, 0);
}
DIDerivedType
DIBuilder::createMemberPointerType(DIType PointeeTy, DIType Base,
uint64_t SizeInBits, uint64_t AlignInBits) {
return MDDerivedType::get(VMContext, dwarf::DW_TAG_ptr_to_member_type, "",
nullptr, 0, nullptr, PointeeTy.getRef(), SizeInBits,
AlignInBits, 0, 0, Base.getRef());
}
DIDerivedType DIBuilder::createReferenceType(unsigned Tag, DIType RTy) {
assert(RTy.isType() && "Unable to create reference type");
return MDDerivedType::get(VMContext, Tag, "", nullptr, 0, nullptr,
RTy.getRef(), 0, 0, 0, 0);
}
DIDerivedType DIBuilder::createTypedef(DIType Ty, StringRef Name, DIFile File,
unsigned LineNo, DIDescriptor Context) {
return MDDerivedType::get(VMContext, dwarf::DW_TAG_typedef, Name,
File.getFileNode(), LineNo,
DIScope(getNonCompileUnitScope(Context)).getRef(),
Ty.getRef(), 0, 0, 0, 0);
}
DIDerivedType DIBuilder::createFriend(DIType Ty, DIType FriendTy) {
// typedefs are encoded in DIDerivedType format.
assert(Ty.isType() && "Invalid type!");
assert(FriendTy.isType() && "Invalid friend type!");
return MDDerivedType::get(VMContext, dwarf::DW_TAG_friend, "", nullptr, 0,
Ty.getRef(), FriendTy.getRef(), 0, 0, 0, 0);
}
DIDerivedType DIBuilder::createInheritance(DIType Ty, DIType BaseTy,
uint64_t BaseOffset,
unsigned Flags) {
assert(Ty.isType() && "Unable to create inheritance");
return MDDerivedType::get(VMContext, dwarf::DW_TAG_inheritance, "", nullptr,
0, Ty.getRef(), BaseTy.getRef(), 0, 0, BaseOffset,
Flags);
}
DIDerivedType DIBuilder::createMemberType(DIDescriptor Scope, StringRef Name,
DIFile File, unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits,
uint64_t OffsetInBits, unsigned Flags,
DIType Ty) {
return MDDerivedType::get(
VMContext, dwarf::DW_TAG_member, Name, File, LineNumber,
DIScope(getNonCompileUnitScope(Scope)).getRef(), Ty.getRef(), SizeInBits,
AlignInBits, OffsetInBits, Flags);
}
static Metadata *getConstantOrNull(Constant *C) {
if (C)
return ConstantAsMetadata::get(C);
return nullptr;
}
DIDerivedType DIBuilder::createStaticMemberType(DIDescriptor Scope,
StringRef Name, DIFile File,
unsigned LineNumber, DIType Ty,
unsigned Flags,
llvm::Constant *Val) {
// TAG_member is encoded in DIDerivedType format.
Flags |= DIDescriptor::FlagStaticMember;
return MDDerivedType::get(
VMContext, dwarf::DW_TAG_member, Name, File, LineNumber,
DIScope(getNonCompileUnitScope(Scope)).getRef(), Ty.getRef(), 0, 0, 0,
Flags, getConstantOrNull(Val));
}
DIDerivedType DIBuilder::createObjCIVar(StringRef Name, DIFile File,
unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits,
uint64_t OffsetInBits, unsigned Flags,
DIType Ty, MDNode *PropertyNode) {
return MDDerivedType::get(VMContext, dwarf::DW_TAG_member, Name, File,
LineNumber, getNonCompileUnitScope(File),
Ty.getRef(), SizeInBits, AlignInBits, OffsetInBits,
Flags, PropertyNode);
}
DIObjCProperty
DIBuilder::createObjCProperty(StringRef Name, DIFile File, unsigned LineNumber,
StringRef GetterName, StringRef SetterName,
unsigned PropertyAttributes, DIType Ty) {
return MDObjCProperty::get(VMContext, Name, File, LineNumber, GetterName,
SetterName, PropertyAttributes, Ty);
}
DITemplateTypeParameter
DIBuilder::createTemplateTypeParameter(DIDescriptor Context, StringRef Name,
DIType Ty) {
assert(!DIScope(getNonCompileUnitScope(Context)).getRef() &&
"Expected compile unit");
return MDTemplateTypeParameter::get(VMContext, Name, Ty.getRef());
}
static DITemplateValueParameter
createTemplateValueParameterHelper(LLVMContext &VMContext, unsigned Tag,
DIDescriptor Context, StringRef Name,
DIType Ty, Metadata *MD) {
assert(!DIScope(getNonCompileUnitScope(Context)).getRef() &&
"Expected compile unit");
return MDTemplateValueParameter::get(VMContext, Tag, Name, Ty.getRef(), MD);
}
DITemplateValueParameter
DIBuilder::createTemplateValueParameter(DIDescriptor Context, StringRef Name,
DIType Ty, Constant *Val) {
return createTemplateValueParameterHelper(
VMContext, dwarf::DW_TAG_template_value_parameter, Context, Name, Ty,
getConstantOrNull(Val));
}
DITemplateValueParameter
DIBuilder::createTemplateTemplateParameter(DIDescriptor Context, StringRef Name,
DIType Ty, StringRef Val) {
return createTemplateValueParameterHelper(
VMContext, dwarf::DW_TAG_GNU_template_template_param, Context, Name, Ty,
MDString::get(VMContext, Val));
}
DITemplateValueParameter
DIBuilder::createTemplateParameterPack(DIDescriptor Context, StringRef Name,
DIType Ty, DIArray Val) {
return createTemplateValueParameterHelper(
VMContext, dwarf::DW_TAG_GNU_template_parameter_pack, Context, Name, Ty,
Val);
}
DICompositeType DIBuilder::createClassType(DIDescriptor Context, StringRef Name,
DIFile File, unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits,
uint64_t OffsetInBits,
unsigned Flags, DIType DerivedFrom,
DIArray Elements,
DIType VTableHolder,
MDNode *TemplateParams,
StringRef UniqueIdentifier) {
assert((!Context || Context.isScope() || Context.isType()) &&
"createClassType should be called with a valid Context");
// TAG_class_type is encoded in DICompositeType format.
DICompositeType R = MDCompositeType::get(
VMContext, dwarf::DW_TAG_structure_type, Name, File, LineNumber,
DIScope(getNonCompileUnitScope(Context)).getRef(), DerivedFrom.getRef(),
SizeInBits, AlignInBits, OffsetInBits, Flags, Elements, 0,
VTableHolder.getRef(), TemplateParams, UniqueIdentifier);
if (!UniqueIdentifier.empty())
retainType(R);
trackIfUnresolved(R);
return R;
}
DICompositeType DIBuilder::createStructType(DIDescriptor Context,
StringRef Name, DIFile File,
unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits,
unsigned Flags, DIType DerivedFrom,
DIArray Elements,
unsigned RunTimeLang,
DIType VTableHolder,
StringRef UniqueIdentifier) {
DICompositeType R = MDCompositeType::get(
VMContext, dwarf::DW_TAG_structure_type, Name, File, LineNumber,
DIScope(getNonCompileUnitScope(Context)).getRef(), DerivedFrom.getRef(),
SizeInBits, AlignInBits, 0, Flags, Elements, RunTimeLang,
VTableHolder.getRef(), nullptr, UniqueIdentifier);
if (!UniqueIdentifier.empty())
retainType(R);
trackIfUnresolved(R);
return R;
}
DICompositeType DIBuilder::createUnionType(DIDescriptor Scope, StringRef Name,
DIFile File, unsigned LineNumber,
uint64_t SizeInBits,
uint64_t AlignInBits, unsigned Flags,
DIArray Elements,
unsigned RunTimeLang,
StringRef UniqueIdentifier) {
DICompositeType R = MDCompositeType::get(
VMContext, dwarf::DW_TAG_union_type, Name, File, LineNumber,
DIScope(getNonCompileUnitScope(Scope)).getRef(), nullptr, SizeInBits,
AlignInBits, 0, Flags, Elements, RunTimeLang, nullptr, nullptr,
UniqueIdentifier);
if (!UniqueIdentifier.empty())
retainType(R);
trackIfUnresolved(R);
return R;
}
DISubroutineType DIBuilder::createSubroutineType(DIFile File,
DITypeArray ParameterTypes,
unsigned Flags) {
return MDSubroutineType::get(VMContext, Flags, ParameterTypes);
}
DICompositeType DIBuilder::createEnumerationType(
DIDescriptor Scope, StringRef Name, DIFile File, unsigned LineNumber,
uint64_t SizeInBits, uint64_t AlignInBits, DIArray Elements,
DIType UnderlyingType, StringRef UniqueIdentifier) {
DICompositeType CTy = MDCompositeType::get(
VMContext, dwarf::DW_TAG_enumeration_type, Name, File, LineNumber,
DIScope(getNonCompileUnitScope(Scope)).getRef(), UnderlyingType.getRef(),
SizeInBits, AlignInBits, 0, 0, Elements, 0, nullptr, nullptr,
UniqueIdentifier);
AllEnumTypes.push_back(CTy);
if (!UniqueIdentifier.empty())
retainType(CTy);
trackIfUnresolved(CTy);
return CTy;
}
DICompositeType DIBuilder::createArrayType(uint64_t Size, uint64_t AlignInBits,
DIType Ty, DIArray Subscripts) {
auto *R = MDCompositeType::get(VMContext, dwarf::DW_TAG_array_type, "",
nullptr, 0, nullptr, Ty.getRef(), Size,
AlignInBits, 0, 0, Subscripts, 0, nullptr);
trackIfUnresolved(R);
return R;
}
DICompositeType DIBuilder::createVectorType(uint64_t Size, uint64_t AlignInBits,
DIType Ty, DIArray Subscripts) {
auto *R = MDCompositeType::get(
VMContext, dwarf::DW_TAG_array_type, "", nullptr, 0, nullptr, Ty.getRef(),
Size, AlignInBits, 0, DIType::FlagVector, Subscripts, 0, nullptr);
trackIfUnresolved(R);
return R;
}
static DIType createTypeWithFlags(LLVMContext &Context, DIType Ty,
unsigned FlagsToSet) {
TempMDType NewTy = cast<MDType>(static_cast<MDNode *>(Ty))->clone();
NewTy->setFlags(NewTy->getFlags() | FlagsToSet);
return MDNode::replaceWithUniqued(std::move(NewTy));
}
DIType DIBuilder::createArtificialType(DIType Ty) {
// FIXME: Restrict this to the nodes where it's valid.
if (Ty.isArtificial())
return Ty;
return createTypeWithFlags(VMContext, Ty, DIType::FlagArtificial);
}
DIType DIBuilder::createObjectPointerType(DIType Ty) {
// FIXME: Restrict this to the nodes where it's valid.
if (Ty.isObjectPointer())
return Ty;
unsigned Flags = DIType::FlagObjectPointer | DIType::FlagArtificial;
return createTypeWithFlags(VMContext, Ty, Flags);
}
void DIBuilder::retainType(DIType T) { AllRetainTypes.emplace_back(T); }
DIBasicType DIBuilder::createUnspecifiedParameter() {
return DIBasicType();
}
DICompositeType
DIBuilder::createForwardDecl(unsigned Tag, StringRef Name, DIDescriptor Scope,
DIFile F, unsigned Line, unsigned RuntimeLang,
uint64_t SizeInBits, uint64_t AlignInBits,
StringRef UniqueIdentifier) {
// FIXME: Define in terms of createReplaceableForwardDecl() by calling
// replaceWithUniqued().
DICompositeType RetTy = MDCompositeType::get(
VMContext, Tag, Name, F.getFileNode(), Line,
DIScope(getNonCompileUnitScope(Scope)).getRef(), nullptr, SizeInBits,
AlignInBits, 0, DIDescriptor::FlagFwdDecl, nullptr, RuntimeLang, nullptr,
nullptr, UniqueIdentifier);
if (!UniqueIdentifier.empty())
retainType(RetTy);
trackIfUnresolved(RetTy);
return RetTy;
}
DICompositeType DIBuilder::createReplaceableCompositeType(
unsigned Tag, StringRef Name, DIDescriptor Scope, DIFile F, unsigned Line,
unsigned RuntimeLang, uint64_t SizeInBits, uint64_t AlignInBits,
unsigned Flags, StringRef UniqueIdentifier) {
DICompositeType RetTy =
MDCompositeType::getTemporary(
VMContext, Tag, Name, F.getFileNode(), Line,
DIScope(getNonCompileUnitScope(Scope)).getRef(), nullptr, SizeInBits,
AlignInBits, 0, Flags, nullptr, RuntimeLang,
nullptr, nullptr, UniqueIdentifier).release();
if (!UniqueIdentifier.empty())
retainType(RetTy);
trackIfUnresolved(RetTy);
return RetTy;
}
DIArray DIBuilder::getOrCreateArray(ArrayRef<Metadata *> Elements) {
return DIArray(MDNode::get(VMContext, Elements));
}
DITypeArray DIBuilder::getOrCreateTypeArray(ArrayRef<Metadata *> Elements) {
SmallVector<llvm::Metadata *, 16> Elts;
for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
if (Elements[i] && isa<MDNode>(Elements[i]))
Elts.push_back(DIType(cast<MDNode>(Elements[i])).getRef());
else
Elts.push_back(Elements[i]);
}
return DITypeArray(MDNode::get(VMContext, Elts));
}
DISubrange DIBuilder::getOrCreateSubrange(int64_t Lo, int64_t Count) {
return MDSubrange::get(VMContext, Count, Lo);
}
static void checkGlobalVariableScope(DIDescriptor Context) {
MDNode *TheCtx = getNonCompileUnitScope(Context);
if (DIScope(TheCtx).isCompositeType()) {
assert(!DICompositeType(TheCtx).getIdentifier() &&
"Context of a global variable should not be a type with identifier");
}
}
DIGlobalVariable DIBuilder::createGlobalVariable(
DIDescriptor Context, StringRef Name, StringRef LinkageName, DIFile F,
unsigned LineNumber, DITypeRef Ty, bool isLocalToUnit, Constant *Val,
MDNode *Decl) {
checkGlobalVariableScope(Context);
auto *N = MDGlobalVariable::get(VMContext, Context, Name, LinkageName, F,
LineNumber, Ty, isLocalToUnit, true,
getConstantOrNull(Val), Decl);
AllGVs.push_back(N);
return N;
}
DIGlobalVariable DIBuilder::createTempGlobalVariableFwdDecl(
DIDescriptor Context, StringRef Name, StringRef LinkageName, DIFile F,
unsigned LineNumber, DITypeRef Ty, bool isLocalToUnit, Constant *Val,
MDNode *Decl) {
checkGlobalVariableScope(Context);
return MDGlobalVariable::getTemporary(VMContext, Context, Name, LinkageName,
F, LineNumber, Ty, isLocalToUnit, false,
getConstantOrNull(Val), Decl).release();
}
DIVariable DIBuilder::createLocalVariable(unsigned Tag, DIDescriptor Scope,
StringRef Name, DIFile File,
unsigned LineNo, DITypeRef Ty,
bool AlwaysPreserve, unsigned Flags,
unsigned ArgNo) {
// FIXME: Why getNonCompileUnitScope()?
// FIXME: Why is "!Context" okay here?
// FIXME: WHy doesn't this check for a subprogram or lexical block (AFAICT
// the only valid scopes)?
DIDescriptor Context(getNonCompileUnitScope(Scope));
assert((!Context || Context.isScope()) &&
"createLocalVariable should be called with a valid Context");
auto *Node =
MDLocalVariable::get(VMContext, Tag, getNonCompileUnitScope(Scope), Name,
File, LineNo, Ty, ArgNo, Flags);
if (AlwaysPreserve) {
// The optimizer may remove local variable. If there is an interest
// to preserve variable info in such situation then stash it in a
// named mdnode.
DISubprogram Fn(getDISubprogram(Scope));
assert(Fn && "Missing subprogram for local variable");
PreservedVariables[Fn].emplace_back(Node);
}
return Node;
}
DIExpression DIBuilder::createExpression(ArrayRef<uint64_t> Addr) {
return MDExpression::get(VMContext, Addr);
}
DIExpression DIBuilder::createExpression(ArrayRef<int64_t> Signed) {
// TODO: Remove the callers of this signed version and delete.
SmallVector<uint64_t, 8> Addr(Signed.begin(), Signed.end());
return createExpression(Addr);
}
DIExpression DIBuilder::createBitPieceExpression(unsigned OffsetInBytes,
unsigned SizeInBytes) {
uint64_t Addr[] = {dwarf::DW_OP_bit_piece, OffsetInBytes, SizeInBytes};
return MDExpression::get(VMContext, Addr);
}
DISubprogram DIBuilder::createFunction(DIScopeRef Context, StringRef Name,
StringRef LinkageName, DIFile File,
unsigned LineNo, DICompositeType Ty,
bool isLocalToUnit, bool isDefinition,
unsigned ScopeLine, unsigned Flags,
bool isOptimized, Function *Fn,
MDNode *TParams, MDNode *Decl) {
// dragonegg does not generate identifier for types, so using an empty map
// to resolve the context should be fine.
DITypeIdentifierMap EmptyMap;
return createFunction(Context.resolve(EmptyMap), Name, LinkageName, File,
LineNo, Ty, isLocalToUnit, isDefinition, ScopeLine,
Flags, isOptimized, Fn, TParams, Decl);
}
DISubprogram DIBuilder::createFunction(DIDescriptor Context, StringRef Name,
StringRef LinkageName, DIFile File,
unsigned LineNo, DICompositeType Ty,
bool isLocalToUnit, bool isDefinition,
unsigned ScopeLine, unsigned Flags,
bool isOptimized, Function *Fn,
MDNode *TParams, MDNode *Decl) {
assert(Ty.getTag() == dwarf::DW_TAG_subroutine_type &&
"function types should be subroutines");
auto *Node = MDSubprogram::get(
VMContext, DIScope(getNonCompileUnitScope(Context)).getRef(), Name,
LinkageName, File.getFileNode(), LineNo, Ty, isLocalToUnit, isDefinition,
ScopeLine, nullptr, 0, 0, Flags, isOptimized, getConstantOrNull(Fn),
TParams, Decl, MDNode::getTemporary(VMContext, None).release());
if (isDefinition)
AllSubprograms.push_back(Node);
trackIfUnresolved(Node);
return Node;
}
DISubprogram
DIBuilder::createTempFunctionFwdDecl(DIDescriptor Context, StringRef Name,
StringRef LinkageName, DIFile File,
unsigned LineNo, DICompositeType Ty,
bool isLocalToUnit, bool isDefinition,
unsigned ScopeLine, unsigned Flags,
bool isOptimized, Function *Fn,
MDNode *TParams, MDNode *Decl) {
return MDSubprogram::getTemporary(
VMContext, DIScope(getNonCompileUnitScope(Context)).getRef(), Name,
LinkageName, File.getFileNode(), LineNo, Ty, isLocalToUnit,
isDefinition, ScopeLine, nullptr, 0, 0, Flags, isOptimized,
getConstantOrNull(Fn), TParams, Decl, nullptr).release();
}
DISubprogram DIBuilder::createMethod(DIDescriptor Context, StringRef Name,
StringRef LinkageName, DIFile F,
unsigned LineNo, DICompositeType Ty,
bool isLocalToUnit, bool isDefinition,
unsigned VK, unsigned VIndex,
DIType VTableHolder, unsigned Flags,
bool isOptimized, Function *Fn,
MDNode *TParam) {
assert(Ty.getTag() == dwarf::DW_TAG_subroutine_type &&
"function types should be subroutines");
assert(getNonCompileUnitScope(Context) &&
"Methods should have both a Context and a context that isn't "
"the compile unit.");
// FIXME: Do we want to use different scope/lines?
auto *Node = MDSubprogram::get(
VMContext, DIScope(Context).getRef(), Name, LinkageName, F.getFileNode(),
LineNo, Ty, isLocalToUnit, isDefinition, LineNo, VTableHolder.getRef(),
VK, VIndex, Flags, isOptimized, getConstantOrNull(Fn), TParam, nullptr,
nullptr);
if (isDefinition)
AllSubprograms.push_back(Node);
DISubprogram S(Node);
assert(S.isSubprogram() && "createMethod should return a valid DISubprogram");
trackIfUnresolved(S);
return S;
}
DINameSpace DIBuilder::createNameSpace(DIDescriptor Scope, StringRef Name,
DIFile File, unsigned LineNo) {
DINameSpace R = MDNamespace::get(VMContext, getNonCompileUnitScope(Scope),
File.getFileNode(), Name, LineNo);
assert(R.Verify() &&
"createNameSpace should return a verifiable DINameSpace");
return R;
}
DILexicalBlockFile DIBuilder::createLexicalBlockFile(DIDescriptor Scope,
DIFile File,
unsigned Discriminator) {
DILexicalBlockFile R = MDLexicalBlockFile::get(
VMContext, Scope, File.getFileNode(), Discriminator);
assert(
R.Verify() &&
"createLexicalBlockFile should return a verifiable DILexicalBlockFile");
return R;
}
DILexicalBlock DIBuilder::createLexicalBlock(DIDescriptor Scope, DIFile File,
unsigned Line, unsigned Col) {
// Make these distinct, to avoid merging two lexical blocks on the same
// file/line/column.
DILexicalBlock R = MDLexicalBlock::getDistinct(
VMContext, getNonCompileUnitScope(Scope), File.getFileNode(), Line, Col);
assert(R.Verify() &&
"createLexicalBlock should return a verifiable DILexicalBlock");
return R;
}
static Value *getDbgIntrinsicValueImpl(LLVMContext &VMContext, Value *V) {
assert(V && "no value passed to dbg intrinsic");
return MetadataAsValue::get(VMContext, ValueAsMetadata::get(V));
}
Instruction *DIBuilder::insertDeclare(Value *Storage, DIVariable VarInfo,
DIExpression Expr,
Instruction *InsertBefore) {
assert(VarInfo.isVariable() &&
"empty or invalid DIVariable passed to dbg.declare");
if (!DeclareFn)
DeclareFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_declare);
trackIfUnresolved(VarInfo);
trackIfUnresolved(Expr);
Value *Args[] = {getDbgIntrinsicValueImpl(VMContext, Storage),
MetadataAsValue::get(VMContext, VarInfo),
MetadataAsValue::get(VMContext, Expr)};
return CallInst::Create(DeclareFn, Args, "", InsertBefore);
}
Instruction *DIBuilder::insertDeclare(Value *Storage, DIVariable VarInfo,
DIExpression Expr,
BasicBlock *InsertAtEnd) {
assert(VarInfo.isVariable() &&
"empty or invalid DIVariable passed to dbg.declare");
if (!DeclareFn)
DeclareFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_declare);
trackIfUnresolved(VarInfo);
trackIfUnresolved(Expr);
Value *Args[] = {getDbgIntrinsicValueImpl(VMContext, Storage),
MetadataAsValue::get(VMContext, VarInfo),
MetadataAsValue::get(VMContext, Expr)};
// If this block already has a terminator then insert this intrinsic
// before the terminator.
if (TerminatorInst *T = InsertAtEnd->getTerminator())
return CallInst::Create(DeclareFn, Args, "", T);
else
return CallInst::Create(DeclareFn, Args, "", InsertAtEnd);
}
Instruction *DIBuilder::insertDbgValueIntrinsic(Value *V, uint64_t Offset,
DIVariable VarInfo,
DIExpression Expr,
Instruction *InsertBefore) {
assert(V && "no value passed to dbg.value");
assert(VarInfo.isVariable() &&
"empty or invalid DIVariable passed to dbg.value");
if (!ValueFn)
ValueFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_value);
trackIfUnresolved(VarInfo);
trackIfUnresolved(Expr);
Value *Args[] = {getDbgIntrinsicValueImpl(VMContext, V),
ConstantInt::get(Type::getInt64Ty(VMContext), Offset),
MetadataAsValue::get(VMContext, VarInfo),
MetadataAsValue::get(VMContext, Expr)};
return CallInst::Create(ValueFn, Args, "", InsertBefore);
}
Instruction *DIBuilder::insertDbgValueIntrinsic(Value *V, uint64_t Offset,
DIVariable VarInfo,
DIExpression Expr,
BasicBlock *InsertAtEnd) {
assert(V && "no value passed to dbg.value");
assert(VarInfo.isVariable() &&
"empty or invalid DIVariable passed to dbg.value");
if (!ValueFn)
ValueFn = Intrinsic::getDeclaration(&M, Intrinsic::dbg_value);
trackIfUnresolved(VarInfo);
trackIfUnresolved(Expr);
Value *Args[] = {getDbgIntrinsicValueImpl(VMContext, V),
ConstantInt::get(Type::getInt64Ty(VMContext), Offset),
MetadataAsValue::get(VMContext, VarInfo),
MetadataAsValue::get(VMContext, Expr)};
return CallInst::Create(ValueFn, Args, "", InsertAtEnd);
}
void DIBuilder::replaceVTableHolder(DICompositeType &T, DICompositeType VTableHolder) {
T.setContainingType(VTableHolder);
// If this didn't create a self-reference, just return.
if (T != VTableHolder)
return;
// Look for unresolved operands. T will drop RAUW support, orphaning any
// cycles underneath it.
if (T->isResolved())
for (const MDOperand &O : T->operands())
if (auto *N = dyn_cast_or_null<MDNode>(O))
trackIfUnresolved(N);
}
void DIBuilder::replaceArrays(DICompositeType &T, DIArray Elements,
DIArray TParams) {
T.setArrays(Elements, TParams);
// If T isn't resolved, there's no problem.
if (!T->isResolved())
return;
// If "T" is resolved, it may be due to a self-reference cycle. Track the
// arrays explicitly if they're unresolved, or else the cycles will be
// orphaned.
if (Elements)
trackIfUnresolved(Elements);
if (TParams)
trackIfUnresolved(TParams);
}
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