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//===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This is the source-level debug info generator for llvm translation.
#include "CGBuilder.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/Expr.h"
#include "clang/AST/ExternalASTSource.h"
#include "clang/AST/Type.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/Optional.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Support/Allocator.h"
namespace llvm {
class MDNode;
namespace clang {
class ClassTemplateSpecializationDecl;
class GlobalDecl;
class ModuleMap;
class ObjCInterfaceDecl;
class ObjCIvarDecl;
class UsingDecl;
class VarDecl;
namespace CodeGen {
class CodeGenModule;
class CodeGenFunction;
class CGBlockInfo;
/// This class gathers all debug information during compilation and is
/// responsible for emitting to llvm globals or pass directly to the
/// backend.
class CGDebugInfo {
friend class ApplyDebugLocation;
friend class SaveAndRestoreLocation;
CodeGenModule &CGM;
const codegenoptions::DebugInfoKind DebugKind;
bool DebugTypeExtRefs;
llvm::DIBuilder DBuilder;
llvm::DICompileUnit *TheCU = nullptr;
ModuleMap *ClangModuleMap = nullptr;
ExternalASTSource::ASTSourceDescriptor PCHDescriptor;
SourceLocation CurLoc;
llvm::MDNode *CurInlinedAt = nullptr;
llvm::DIType *VTablePtrType = nullptr;
llvm::DIType *ClassTy = nullptr;
llvm::DICompositeType *ObjTy = nullptr;
llvm::DIType *SelTy = nullptr;
#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
llvm::DIType *SingletonId = nullptr;
#include "clang/Basic/OpenCLImageTypes.def"
llvm::DIType *OCLSamplerDITy = nullptr;
llvm::DIType *OCLEventDITy = nullptr;
llvm::DIType *OCLClkEventDITy = nullptr;
llvm::DIType *OCLQueueDITy = nullptr;
llvm::DIType *OCLNDRangeDITy = nullptr;
llvm::DIType *OCLReserveIDDITy = nullptr;
/// Cache of previously constructed Types.
llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
llvm::SmallDenseMap<llvm::StringRef, llvm::StringRef> DebugPrefixMap;
struct ObjCInterfaceCacheEntry {
const ObjCInterfaceType *Type;
llvm::DIType *Decl;
llvm::DIFile *Unit;
ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType *Decl,
llvm::DIFile *Unit)
: Type(Type), Decl(Decl), Unit(Unit) {}
/// Cache of previously constructed interfaces which may change.
llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
/// Cache of references to clang modules and precompiled headers.
llvm::DenseMap<const Module *, llvm::TrackingMDRef> ModuleCache;
/// List of interfaces we want to keep even if orphaned.
std::vector<void *> RetainedTypes;
/// Cache of forward declared types to RAUW at the end of compilation.
std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
/// Cache of replaceable forward declarations (functions and
/// variables) to RAUW at the end of compilation.
std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
/// Keep track of our current nested lexical block.
std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
/// Keep track of LexicalBlockStack counter at the beginning of a
/// function. This is used to pop unbalanced regions at the end of a
/// function.
std::vector<unsigned> FnBeginRegionCount;
/// This is a storage for names that are constructed on demand. For
/// example, C++ destructors, C++ operators etc..
llvm::BumpPtrAllocator DebugInfoNames;
StringRef CWDName;
llvm::DenseMap<const char *, llvm::TrackingMDRef> DIFileCache;
llvm::DenseMap<const FunctionDecl *, llvm::TrackingMDRef> SPCache;
/// Cache declarations relevant to DW_TAG_imported_declarations (C++
/// using declarations) that aren't covered by other more specific caches.
llvm::DenseMap<const Decl *, llvm::TrackingMDRef> DeclCache;
llvm::DenseMap<const NamespaceDecl *, llvm::TrackingMDRef> NamespaceCache;
llvm::DenseMap<const NamespaceAliasDecl *, llvm::TrackingMDRef>
llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIDerivedType>>
/// Helper functions for getOrCreateType.
/// @{
/// Currently the checksum of an interface includes the number of
/// ivars and property accessors.
llvm::DIType *CreateType(const BuiltinType *Ty);
llvm::DIType *CreateType(const ComplexType *Ty);
llvm::DIType *CreateQualifiedType(QualType Ty, llvm::DIFile *Fg);
llvm::DIType *CreateType(const TypedefType *Ty, llvm::DIFile *Fg);
llvm::DIType *CreateType(const TemplateSpecializationType *Ty,
llvm::DIFile *Fg);
llvm::DIType *CreateType(const ObjCObjectPointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const PointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const BlockPointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const FunctionType *Ty, llvm::DIFile *F);
/// Get structure or union type.
llvm::DIType *CreateType(const RecordType *Tyg);
llvm::DIType *CreateTypeDefinition(const RecordType *Ty);
llvm::DICompositeType *CreateLimitedType(const RecordType *Ty);
void CollectContainingType(const CXXRecordDecl *RD,
llvm::DICompositeType *CT);
/// Get Objective-C interface type.
llvm::DIType *CreateType(const ObjCInterfaceType *Ty, llvm::DIFile *F);
llvm::DIType *CreateTypeDefinition(const ObjCInterfaceType *Ty,
llvm::DIFile *F);
/// Get Objective-C object type.
llvm::DIType *CreateType(const ObjCObjectType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const ObjCTypeParamType *Ty, llvm::DIFile *Unit);
llvm::DIType *CreateType(const VectorType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const ArrayType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const LValueReferenceType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const RValueReferenceType *Ty, llvm::DIFile *Unit);
llvm::DIType *CreateType(const MemberPointerType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const AtomicType *Ty, llvm::DIFile *F);
llvm::DIType *CreateType(const PipeType *Ty, llvm::DIFile *F);
/// Get enumeration type.
llvm::DIType *CreateEnumType(const EnumType *Ty);
llvm::DIType *CreateTypeDefinition(const EnumType *Ty);
/// Look up the completed type for a self pointer in the TypeCache and
/// create a copy of it with the ObjectPointer and Artificial flags
/// set. If the type is not cached, a new one is created. This should
/// never happen though, since creating a type for the implicit self
/// argument implies that we already parsed the interface definition
/// and the ivar declarations in the implementation.
llvm::DIType *CreateSelfType(const QualType &QualTy, llvm::DIType *Ty);
/// @}
/// Get the type from the cache or return null type if it doesn't
/// exist.
llvm::DIType *getTypeOrNull(const QualType);
/// Return the debug type for a C++ method.
/// \arg CXXMethodDecl is of FunctionType. This function type is
/// not updated to include implicit \c this pointer. Use this routine
/// to get a method type which includes \c this pointer.
llvm::DISubroutineType *getOrCreateMethodType(const CXXMethodDecl *Method,
llvm::DIFile *F);
llvm::DISubroutineType *
getOrCreateInstanceMethodType(QualType ThisPtr, const FunctionProtoType *Func,
llvm::DIFile *Unit);
llvm::DISubroutineType *
getOrCreateFunctionType(const Decl *D, QualType FnType, llvm::DIFile *F);
/// \return debug info descriptor for vtable.
llvm::DIType *getOrCreateVTablePtrType(llvm::DIFile *F);
/// \return namespace descriptor for the given namespace decl.
llvm::DINamespace *getOrCreateNamespace(const NamespaceDecl *N);
llvm::DIType *CreatePointerLikeType(llvm::dwarf::Tag Tag, const Type *Ty,
QualType PointeeTy, llvm::DIFile *F);
llvm::DIType *getOrCreateStructPtrType(StringRef Name, llvm::DIType *&Cache);
/// A helper function to create a subprogram for a single member
/// function GlobalDecl.
llvm::DISubprogram *CreateCXXMemberFunction(const CXXMethodDecl *Method,
llvm::DIFile *F,
llvm::DIType *RecordTy);
/// A helper function to collect debug info for C++ member
/// functions. This is used while creating debug info entry for a
/// Record.
void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile *F,
SmallVectorImpl<llvm::Metadata *> &E,
llvm::DIType *T);
/// A helper function to collect debug info for C++ base
/// classes. This is used while creating debug info entry for a
/// Record.
void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile *F,
SmallVectorImpl<llvm::Metadata *> &EltTys,
llvm::DIType *RecordTy);
/// Helper function for CollectCXXBases.
/// Adds debug info entries for types in Bases that are not in SeenTypes.
void CollectCXXBasesAux(const CXXRecordDecl *RD, llvm::DIFile *Unit,
SmallVectorImpl<llvm::Metadata *> &EltTys,
llvm::DIType *RecordTy,
const CXXRecordDecl::base_class_const_range &Bases,
llvm::DenseSet<CanonicalDeclPtr<const CXXRecordDecl>> &SeenTypes,
llvm::DINode::DIFlags StartingFlags);
/// A helper function to collect template parameters.
llvm::DINodeArray CollectTemplateParams(const TemplateParameterList *TPList,
ArrayRef<TemplateArgument> TAList,
llvm::DIFile *Unit);
/// A helper function to collect debug info for function template
/// parameters.
llvm::DINodeArray CollectFunctionTemplateParams(const FunctionDecl *FD,
llvm::DIFile *Unit);
/// A helper function to collect debug info for template
/// parameters.
CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
llvm::DIFile *F);
llvm::DIType *createFieldType(StringRef name, QualType type,
SourceLocation loc, AccessSpecifier AS,
uint64_t offsetInBits,
uint32_t AlignInBits,
llvm::DIFile *tunit, llvm::DIScope *scope,
const RecordDecl *RD = nullptr);
llvm::DIType *createFieldType(StringRef name, QualType type,
SourceLocation loc, AccessSpecifier AS,
uint64_t offsetInBits, llvm::DIFile *tunit,
llvm::DIScope *scope,
const RecordDecl *RD = nullptr) {
return createFieldType(name, type, loc, AS, offsetInBits, 0, tunit, scope,
/// Create new bit field member.
llvm::DIType *createBitFieldType(const FieldDecl *BitFieldDecl,
llvm::DIScope *RecordTy,
const RecordDecl *RD);
/// Helpers for collecting fields of a record.
/// @{
void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
SmallVectorImpl<llvm::Metadata *> &E,
llvm::DIType *RecordTy);
llvm::DIDerivedType *CreateRecordStaticField(const VarDecl *Var,
llvm::DIType *RecordTy,
const RecordDecl *RD);
void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
llvm::DIFile *F,
SmallVectorImpl<llvm::Metadata *> &E,
llvm::DIType *RecordTy, const RecordDecl *RD);
void CollectRecordNestedType(const TypeDecl *RD,
SmallVectorImpl<llvm::Metadata *> &E);
void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile *F,
SmallVectorImpl<llvm::Metadata *> &E,
llvm::DICompositeType *RecordTy);
/// If the C++ class has vtable info then insert appropriate debug
/// info entry in EltTys vector.
void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile *F,
SmallVectorImpl<llvm::Metadata *> &EltTys,
llvm::DICompositeType *RecordTy);
/// @}
/// Create a new lexical block node and push it on the stack.
void CreateLexicalBlock(SourceLocation Loc);
/// If target-specific LLVM \p AddressSpace directly maps to target-specific
/// DWARF address space, appends extended dereferencing mechanism to complex
/// expression \p Expr. Otherwise, does nothing.
/// Extended dereferencing mechanism is has the following format:
/// DW_OP_constu <DWARF Address Space> DW_OP_swap DW_OP_xderef
void AppendAddressSpaceXDeref(unsigned AddressSpace,
SmallVectorImpl<int64_t> &Expr) const;
CGDebugInfo(CodeGenModule &CGM);
void finalize();
/// Module debugging: Support for building PCMs.
/// @{
/// Set the main CU's DwoId field to \p Signature.
void setDwoId(uint64_t Signature);
/// When generating debug information for a clang module or
/// precompiled header, this module map will be used to determine
/// the module of origin of each Decl.
void setModuleMap(ModuleMap &MMap) { ClangModuleMap = &MMap; }
/// When generating debug information for a clang module or
/// precompiled header, this module map will be used to determine
/// the module of origin of each Decl.
void setPCHDescriptor(ExternalASTSource::ASTSourceDescriptor PCH) {
PCHDescriptor = PCH;
/// @}
/// Update the current source location. If \arg loc is invalid it is
/// ignored.
void setLocation(SourceLocation Loc);
/// Return the current source location. This does not necessarily correspond
/// to the IRBuilder's current DebugLoc.
SourceLocation getLocation() const { return CurLoc; }
/// Update the current inline scope. All subsequent calls to \p EmitLocation
/// will create a location with this inlinedAt field.
void setInlinedAt(llvm::MDNode *InlinedAt) { CurInlinedAt = InlinedAt; }
/// \return the current inline scope.
llvm::MDNode *getInlinedAt() const { return CurInlinedAt; }
// Converts a SourceLocation to a DebugLoc
llvm::DebugLoc SourceLocToDebugLoc(SourceLocation Loc);
/// Emit metadata to indicate a change in line/column information in
/// the source file. If the location is invalid, the previous
/// location will be reused.
void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);
/// Emit a call to llvm.dbg.function.start to indicate
/// start of a new function.
/// \param Loc The location of the function header.
/// \param ScopeLoc The location of the function body.
void EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
SourceLocation ScopeLoc, QualType FnType,
llvm::Function *Fn, CGBuilderTy &Builder);
/// Start a new scope for an inlined function.
void EmitInlineFunctionStart(CGBuilderTy &Builder, GlobalDecl GD);
/// End an inlined function scope.
void EmitInlineFunctionEnd(CGBuilderTy &Builder);
/// Emit debug info for a function declaration.
void EmitFunctionDecl(GlobalDecl GD, SourceLocation Loc, QualType FnType);
/// Constructs the debug code for exiting a function.
void EmitFunctionEnd(CGBuilderTy &Builder, llvm::Function *Fn);
/// Emit metadata to indicate the beginning of a new lexical block
/// and push the block onto the stack.
void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
/// Emit metadata to indicate the end of a new lexical block and pop
/// the current block.
void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
/// Emit call to \c llvm.dbg.declare for an automatic variable
/// declaration.
void EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
CGBuilderTy &Builder);
/// Emit call to \c llvm.dbg.declare for an imported variable
/// declaration in a block.
void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
llvm::Value *storage,
CGBuilderTy &Builder,
const CGBlockInfo &blockInfo,
llvm::Instruction *InsertPoint = nullptr);
/// Emit call to \c llvm.dbg.declare for an argument variable
/// declaration.
void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
unsigned ArgNo, CGBuilderTy &Builder);
/// Emit call to \c llvm.dbg.declare for the block-literal argument
/// to a block invocation function.
void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
StringRef Name, unsigned ArgNo,
llvm::AllocaInst *LocalAddr,
CGBuilderTy &Builder);
/// Emit information about a global variable.
void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
/// Emit a constant global variable's debug info.
void EmitGlobalVariable(const ValueDecl *VD, const APValue &Init);
/// Emit C++ using directive.
void EmitUsingDirective(const UsingDirectiveDecl &UD);
/// Emit the type explicitly casted to.
void EmitExplicitCastType(QualType Ty);
/// Emit C++ using declaration.
void EmitUsingDecl(const UsingDecl &UD);
/// Emit an @import declaration.
void EmitImportDecl(const ImportDecl &ID);
/// Emit C++ namespace alias.
llvm::DIImportedEntity *EmitNamespaceAlias(const NamespaceAliasDecl &NA);
/// Emit record type's standalone debug info.
llvm::DIType *getOrCreateRecordType(QualType Ty, SourceLocation L);
/// Emit an Objective-C interface type standalone debug info.
llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);
/// Emit standalone debug info for a type.
llvm::DIType *getOrCreateStandaloneType(QualType Ty, SourceLocation Loc);
void completeType(const EnumDecl *ED);
void completeType(const RecordDecl *RD);
void completeRequiredType(const RecordDecl *RD);
void completeClassData(const RecordDecl *RD);
void completeClass(const RecordDecl *RD);
void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
void completeUnusedClass(const CXXRecordDecl &D);
/// Create debug info for a macro defined by a #define directive or a macro
/// undefined by a #undef directive.
llvm::DIMacro *CreateMacro(llvm::DIMacroFile *Parent, unsigned MType,
SourceLocation LineLoc, StringRef Name,
StringRef Value);
/// Create debug info for a file referenced by an #include directive.
llvm::DIMacroFile *CreateTempMacroFile(llvm::DIMacroFile *Parent,
SourceLocation LineLoc,
SourceLocation FileLoc);
/// Emit call to llvm.dbg.declare for a variable declaration.
void EmitDeclare(const VarDecl *decl, llvm::Value *AI,
llvm::Optional<unsigned> ArgNo, CGBuilderTy &Builder);
/// Build up structure info for the byref. See \a BuildByRefType.
llvm::DIType *EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
uint64_t *OffSet);
/// Get context info for the DeclContext of \p Decl.
llvm::DIScope *getDeclContextDescriptor(const Decl *D);
/// Get context info for a given DeclContext \p Decl.
llvm::DIScope *getContextDescriptor(const Decl *Context,
llvm::DIScope *Default);
llvm::DIScope *getCurrentContextDescriptor(const Decl *Decl);
/// Create a forward decl for a RecordType in a given context.
llvm::DICompositeType *getOrCreateRecordFwdDecl(const RecordType *,
llvm::DIScope *);
/// Return current directory name.
StringRef getCurrentDirname();
/// Create new compile unit.
void CreateCompileUnit();
/// Remap a given path with the current debug prefix map
std::string remapDIPath(StringRef) const;
/// Compute the file checksum debug info for input file ID.
llvm::DIFile::ChecksumKind computeChecksum(FileID FID,
SmallString<32> &Checksum) const;
/// Get the file debug info descriptor for the input location.
llvm::DIFile *getOrCreateFile(SourceLocation Loc);
/// Get the file info for main compile unit.
llvm::DIFile *getOrCreateMainFile();
/// Get the type from the cache or create a new type if necessary.
llvm::DIType *getOrCreateType(QualType Ty, llvm::DIFile *Fg);
/// Get a reference to a clang module. If \p CreateSkeletonCU is true,
/// this also creates a split dwarf skeleton compile unit.
llvm::DIModule *
getOrCreateModuleRef(ExternalASTSource::ASTSourceDescriptor Mod,
bool CreateSkeletonCU);
/// DebugTypeExtRefs: If \p D originated in a clang module, return it.
llvm::DIModule *getParentModuleOrNull(const Decl *D);
/// Get the type from the cache or create a new partial type if
/// necessary.
llvm::DICompositeType *getOrCreateLimitedType(const RecordType *Ty,
llvm::DIFile *F);
/// Create type metadata for a source language type.
llvm::DIType *CreateTypeNode(QualType Ty, llvm::DIFile *Fg);
/// Create new member and increase Offset by FType's size.
llvm::DIType *CreateMemberType(llvm::DIFile *Unit, QualType FType,
StringRef Name, uint64_t *Offset);
/// Retrieve the DIDescriptor, if any, for the canonical form of this
/// declaration.
llvm::DINode *getDeclarationOrDefinition(const Decl *D);
/// \return debug info descriptor to describe method
/// declaration for the given method definition.
llvm::DISubprogram *getFunctionDeclaration(const Decl *D);
/// \return debug info descriptor to describe in-class static data
/// member declaration for the given out-of-class definition. If D
/// is an out-of-class definition of a static data member of a
/// class, find its corresponding in-class declaration.
llvm::DIDerivedType *
getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
/// Helper that either creates a forward declaration or a stub.
llvm::DISubprogram *getFunctionFwdDeclOrStub(GlobalDecl GD, bool Stub);
/// Create a subprogram describing the forward declaration
/// represented in the given FunctionDecl wrapped in a GlobalDecl.
llvm::DISubprogram *getFunctionForwardDeclaration(GlobalDecl GD);
/// Create a DISubprogram describing the function
/// represented in the given FunctionDecl wrapped in a GlobalDecl.
llvm::DISubprogram *getFunctionStub(GlobalDecl GD);
/// Create a global variable describing the forward declaration
/// represented in the given VarDecl.
llvm::DIGlobalVariable *
getGlobalVariableForwardDeclaration(const VarDecl *VD);
/// Return a global variable that represents one of the collection of global
/// variables created for an anonmyous union.
/// Recursively collect all of the member fields of a global
/// anonymous decl and create static variables for them. The first
/// time this is called it needs to be on a union and then from
/// there we can have additional unnamed fields.
llvm::DIGlobalVariableExpression *
CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile *Unit,
unsigned LineNo, StringRef LinkageName,
llvm::GlobalVariable *Var, llvm::DIScope *DContext);
/// Get the printing policy for producing names for debug info.
PrintingPolicy getPrintingPolicy() const;
/// Get function name for the given FunctionDecl. If the name is
/// constructed on demand (e.g., C++ destructor) then the name is
/// stored on the side.
StringRef getFunctionName(const FunctionDecl *FD);
/// Returns the unmangled name of an Objective-C method.
/// This is the display name for the debugging info.
StringRef getObjCMethodName(const ObjCMethodDecl *FD);
/// Return selector name. This is used for debugging
/// info.
StringRef getSelectorName(Selector S);
/// Get class name including template argument list.
StringRef getClassName(const RecordDecl *RD);
/// Get the vtable name for the given class.
StringRef getVTableName(const CXXRecordDecl *Decl);
/// Get line number for the location. If location is invalid
/// then use current location.
unsigned getLineNumber(SourceLocation Loc);
/// Get column number for the location. If location is
/// invalid then use current location.
/// \param Force Assume DebugColumnInfo option is true.
unsigned getColumnNumber(SourceLocation Loc, bool Force = false);
/// Collect various properties of a FunctionDecl.
/// \param GD A GlobalDecl whose getDecl() must return a FunctionDecl.
void collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
StringRef &Name, StringRef &LinkageName,
llvm::DIScope *&FDContext,
llvm::DINodeArray &TParamsArray,
llvm::DINode::DIFlags &Flags);
/// Collect various properties of a VarDecl.
void collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
unsigned &LineNo, QualType &T, StringRef &Name,
StringRef &LinkageName, llvm::DIScope *&VDContext);
/// Allocate a copy of \p A using the DebugInfoNames allocator
/// and return a reference to it. If multiple arguments are given the strings
/// are concatenated.
StringRef internString(StringRef A, StringRef B = StringRef()) {
char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
if (!A.empty())
std::memcpy(Data,, A.size());
if (!B.empty())
std::memcpy(Data + A.size(),, B.size());
return StringRef(Data, A.size() + B.size());
/// A scoped helper to set the current debug location to the specified
/// location or preferred location of the specified Expr.
class ApplyDebugLocation {
void init(SourceLocation TemporaryLocation, bool DefaultToEmpty = false);
ApplyDebugLocation(CodeGenFunction &CGF, bool DefaultToEmpty,
SourceLocation TemporaryLocation);
llvm::DebugLoc OriginalLocation;
CodeGenFunction *CGF;
/// Set the location to the (valid) TemporaryLocation.
ApplyDebugLocation(CodeGenFunction &CGF, SourceLocation TemporaryLocation);
ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
ApplyDebugLocation(ApplyDebugLocation &&Other) : CGF(Other.CGF) {
Other.CGF = nullptr;
/// \brief Apply TemporaryLocation if it is valid. Otherwise switch
/// to an artificial debug location that has a valid scope, but no
/// line information.
/// Artificial locations are useful when emitting compiler-generated
/// helper functions that have no source location associated with
/// them. The DWARF specification allows the compiler to use the
/// special line number 0 to indicate code that can not be
/// attributed to any source location. Note that passing an empty
/// SourceLocation to CGDebugInfo::setLocation() will result in the
/// last valid location being reused.
static ApplyDebugLocation CreateArtificial(CodeGenFunction &CGF) {
return ApplyDebugLocation(CGF, false, SourceLocation());
/// \brief Apply TemporaryLocation if it is valid. Otherwise switch
/// to an artificial debug location that has a valid scope, but no
/// line information.
static ApplyDebugLocation
CreateDefaultArtificial(CodeGenFunction &CGF,
SourceLocation TemporaryLocation) {
return ApplyDebugLocation(CGF, false, TemporaryLocation);
/// Set the IRBuilder to not attach debug locations. Note that
/// passing an empty SourceLocation to \a CGDebugInfo::setLocation()
/// will result in the last valid location being reused. Note that
/// all instructions that do not have a location at the beginning of
/// a function are counted towards to function prologue.
static ApplyDebugLocation CreateEmpty(CodeGenFunction &CGF) {
return ApplyDebugLocation(CGF, true, SourceLocation());
/// A scoped helper to set the current debug location to an inlined location.
class ApplyInlineDebugLocation {
SourceLocation SavedLocation;
CodeGenFunction *CGF;
/// Set up the CodeGenFunction's DebugInfo to produce inline locations for the
/// function \p InlinedFn. The current debug location becomes the inlined call
/// site of the inlined function.
ApplyInlineDebugLocation(CodeGenFunction &CGF, GlobalDecl InlinedFn);
/// Restore everything back to the orginial state.
} // namespace CodeGen
} // namespace clang