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llvm-project/clang/lib/CodeGen/CGDebugInfo.h

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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.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
#define LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
#include "CGBuilder.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Type.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "llvm/ADT/DenseMap.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 CXXMethodDecl;
class VarDecl;
class ObjCInterfaceDecl;
class ObjCIvarDecl;
class ClassTemplateSpecializationDecl;
class GlobalDecl;
class UsingDecl;
namespace CodeGen {
class CodeGenModule;
class CodeGenFunction;
class CGBlockInfo;
/// \brief 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 ArtificialLocation;
friend class SaveAndRestoreLocation;
CodeGenModule &CGM;
const CodeGenOptions::DebugInfoKind DebugKind;
llvm::DIBuilder DBuilder;
llvm::DICompileUnit TheCU;
SourceLocation CurLoc;
llvm::DIType VTablePtrType;
llvm::DIType ClassTy;
llvm::DICompositeType ObjTy;
llvm::DIType SelTy;
llvm::DIType OCLImage1dDITy, OCLImage1dArrayDITy, OCLImage1dBufferDITy;
llvm::DIType OCLImage2dDITy, OCLImage2dArrayDITy;
llvm::DIType OCLImage3dDITy;
llvm::DIType OCLEventDITy;
llvm::DIType BlockLiteralGeneric;
/// \brief Cache of previously constructed Types.
llvm::DenseMap<const void *, llvm::TrackingMDRef> TypeCache;
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) {}
};
/// \brief Cache of previously constructed interfaces
/// which may change.
llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
/// \brief list of interfaces we want to keep even if orphaned.
std::vector<void *> RetainedTypes;
/// \brief Cache of forward declared types to RAUW at the end of
/// compilation.
std::vector<std::pair<const TagType *, llvm::TrackingMDRef>> ReplaceMap;
/// \brief Cache of replaceable forward declarartions (functions and
/// variables) to RAUW at the end of compilation.
std::vector<std::pair<const DeclaratorDecl *, llvm::TrackingMDRef>>
FwdDeclReplaceMap;
// LexicalBlockStack - Keep track of our current nested lexical block.
std::vector<llvm::TrackingMDNodeRef> LexicalBlockStack;
llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
// FnBeginRegionCount - 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;
/// \brief 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;
/// \brief 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>
NamespaceAliasCache;
llvm::DenseMap<const Decl *, llvm::TrackingMDRef> StaticDataMemberCache;
/// Helper functions for getOrCreateType.
unsigned Checksum(const ObjCInterfaceDecl *InterfaceDecl);
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);
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);
llvm::DIType CreateType(const ObjCInterfaceType *Ty, llvm::DIFile F);
llvm::DIType CreateTypeDefinition(const ObjCInterfaceType *Ty, llvm::DIFile F);
llvm::DIType CreateType(const ObjCObjectType *Ty, llvm::DIFile F);
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 CreateEnumType(const EnumType *Ty);
llvm::DIType CreateTypeDefinition(const EnumType *Ty);
llvm::DIType CreateSelfType(const QualType &QualTy, llvm::DIType Ty);
llvm::DIType getTypeOrNull(const QualType);
llvm::DICompositeType getOrCreateMethodType(const CXXMethodDecl *Method,
llvm::DIFile F);
llvm::DICompositeType getOrCreateInstanceMethodType(
QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile Unit);
llvm::DICompositeType getOrCreateFunctionType(const Decl *D, QualType FnType,
llvm::DIFile F);
llvm::DIType getOrCreateVTablePtrType(llvm::DIFile F);
llvm::DINameSpace getOrCreateNameSpace(const NamespaceDecl *N);
llvm::DIType getOrCreateTypeDeclaration(QualType PointeeTy, llvm::DIFile F);
llvm::DIType CreatePointerLikeType(llvm::dwarf::Tag Tag,
const Type *Ty, QualType PointeeTy,
llvm::DIFile F);
llvm::Value *getCachedInterfaceTypeOrNull(const QualType Ty);
llvm::DIType getOrCreateStructPtrType(StringRef Name, llvm::DIType &Cache);
llvm::DISubprogram CreateCXXMemberFunction(const CXXMethodDecl *Method,
llvm::DIFile F,
llvm::DIType RecordTy);
void CollectCXXMemberFunctions(const CXXRecordDecl *Decl, llvm::DIFile F,
SmallVectorImpl<llvm::Metadata *> &E,
llvm::DIType T);
void CollectCXXBases(const CXXRecordDecl *Decl, llvm::DIFile F,
SmallVectorImpl<llvm::Metadata *> &EltTys,
llvm::DIType RecordTy);
llvm::DIArray
CollectTemplateParams(const TemplateParameterList *TPList,
ArrayRef<TemplateArgument> TAList,
llvm::DIFile Unit);
llvm::DIArray
CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit);
llvm::DIArray
CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
llvm::DIFile F);
llvm::DIType createFieldType(StringRef name, QualType type,
uint64_t sizeInBitsOverride, SourceLocation loc,
AccessSpecifier AS,
uint64_t offsetInBits,
llvm::DIFile tunit,
llvm::DIScope scope,
const RecordDecl* RD = nullptr);
// 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 CollectRecordFields(const RecordDecl *Decl, llvm::DIFile F,
SmallVectorImpl<llvm::Metadata *> &E,
llvm::DICompositeType RecordTy);
void CollectVTableInfo(const CXXRecordDecl *Decl, llvm::DIFile F,
SmallVectorImpl<llvm::Metadata *> &EltTys);
// CreateLexicalBlock - Create a new lexical block node and push it on
// the stack.
void CreateLexicalBlock(SourceLocation Loc);
public:
CGDebugInfo(CodeGenModule &CGM);
~CGDebugInfo();
void finalize();
/// \brief Update the current source location. If \arg loc is
/// invalid it is ignored.
void setLocation(SourceLocation Loc);
/// \brief Emit metadata to indicate a change in line/column
/// information in the source file.
void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc);
/// \brief 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);
/// \brief Constructs the debug code for exiting a function.
void EmitFunctionEnd(CGBuilderTy &Builder);
/// \brief Emit metadata to indicate the beginning of a
/// new lexical block and push the block onto the stack.
void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
/// \brief Emit metadata to indicate the end of a new lexical
/// block and pop the current block.
void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
/// \brief Emit call to llvm.dbg.declare for an automatic
/// variable declaration.
void EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
CGBuilderTy &Builder);
/// \brief Emit call to 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 = 0);
/// \brief Emit call to llvm.dbg.declare for an argument
/// variable declaration.
void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
unsigned ArgNo, CGBuilderTy &Builder);
/// \brief Emit call to
/// llvm.dbg.declare for the block-literal argument to a block
/// invocation function.
void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
llvm::Value *Arg, unsigned ArgNo,
llvm::Value *LocalAddr,
CGBuilderTy &Builder);
/// \brief Emit information about a global variable.
void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
/// \brief Emit global variable's debug info.
void EmitGlobalVariable(const ValueDecl *VD, llvm::Constant *Init);
/// \brief Emit C++ using directive.
void EmitUsingDirective(const UsingDirectiveDecl &UD);
/// \brief Emit the type explicitly casted to.
void EmitExplicitCastType(QualType Ty);
/// \brief Emit C++ using declaration.
void EmitUsingDecl(const UsingDecl &UD);
/// \brief Emit C++ namespace alias.
llvm::DIImportedEntity EmitNamespaceAlias(const NamespaceAliasDecl &NA);
/// \brief Emit record type's standalone debug info.
llvm::DIType getOrCreateRecordType(QualType Ty, SourceLocation L);
/// \brief Emit an objective c interface type standalone
/// debug info.
llvm::DIType getOrCreateInterfaceType(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 completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
private:
/// \brief Emit call to llvm.dbg.declare for a variable declaration.
/// Tag accepts custom types DW_TAG_arg_variable and DW_TAG_auto_variable,
/// otherwise would be of type llvm::dwarf::Tag.
void EmitDeclare(const VarDecl *decl, llvm::dwarf::LLVMConstants Tag,
llvm::Value *AI, unsigned ArgNo, CGBuilderTy &Builder);
// EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
// See BuildByRefType.
llvm::DIType EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
uint64_t *OffSet);
/// \brief Get context info for the decl.
llvm::DIScope getContextDescriptor(const Decl *Decl);
llvm::DIScope getCurrentContextDescriptor(const Decl *Decl);
/// \brief Create a forward decl for a RecordType in a given context.
llvm::DICompositeType getOrCreateRecordFwdDecl(const RecordType *,
llvm::DIDescriptor);
/// \brief Create a set of decls for the context chain.
llvm::DIDescriptor createContextChain(const Decl *Decl);
/// \brief Return current directory name.
StringRef getCurrentDirname();
/// \brief Create new compile unit.
void CreateCompileUnit();
/// \brief Get the file debug info descriptor for the input
/// location.
llvm::DIFile getOrCreateFile(SourceLocation Loc);
/// \brief Get the file info for main compile unit.
llvm::DIFile getOrCreateMainFile();
/// \brief Get the type from the cache or create a new type if
/// necessary.
llvm::DIType getOrCreateType(QualType Ty, llvm::DIFile Fg);
/// \brief Get the type from the cache or create a new
/// partial type if necessary.
llvm::DIType getOrCreateLimitedType(const RecordType *Ty, llvm::DIFile F);
/// \brief Create type metadata for a source language type.
llvm::DIType CreateTypeNode(QualType Ty, llvm::DIFile Fg);
/// \brief return the underlying ObjCInterfaceDecl
/// if Ty is an ObjCInterface or a pointer to one.
ObjCInterfaceDecl* getObjCInterfaceDecl(QualType Ty);
/// \brief Create new member and increase Offset by FType's size.
llvm::DIType CreateMemberType(llvm::DIFile Unit, QualType FType,
StringRef Name, uint64_t *Offset);
/// \brief Retrieve the DIDescriptor, if any, for the canonical form of this
/// declaration.
llvm::DIDescriptor getDeclarationOrDefinition(const Decl *D);
/// \brief 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.
llvm::DIDerivedType
getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
/// \brief Create a DISubprogram describing the forward
/// decalration represented in the given FunctionDecl.
llvm::DISubprogram getFunctionForwardDeclaration(const FunctionDecl *FD);
/// \brief Create a DIGlobalVariable describing the forward
/// decalration 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.
llvm::DIGlobalVariable
CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile Unit, unsigned LineNo,
StringRef LinkageName, llvm::GlobalVariable *Var,
llvm::DIDescriptor DContext);
/// \brief 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);
/// \brief Returns the unmangled name of an Objective-C method.
/// This is the display name for the debugging info.
StringRef getObjCMethodName(const ObjCMethodDecl *FD);
/// \brief Return selector name. This is used for debugging
/// info.
StringRef getSelectorName(Selector S);
/// \brief Get class name including template argument list.
StringRef getClassName(const RecordDecl *RD);
/// \brief Get vtable name for the given Class.
StringRef getVTableName(const CXXRecordDecl *Decl);
/// \brief Get line number for the location. If location is invalid
/// then use current location.
unsigned getLineNumber(SourceLocation Loc);
/// \brief 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);
/// \brief 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::DIDescriptor &FDContext,
llvm::DIArray &TParamsArray,
unsigned &Flags);
/// \brief Collect various properties of a VarDecl.
void collectVarDeclProps(const VarDecl *VD, llvm::DIFile &Unit,
unsigned &LineNo, QualType &T,
StringRef &Name, StringRef &LinkageName,
llvm::DIDescriptor &VDContext);
/// \brief 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());
std::memcpy(Data, A.data(), A.size());
std::memcpy(Data + A.size(), B.data(), B.size());
return StringRef(Data, A.size() + B.size());
}
};
/// \brief A scoped helper to set the current debug location to the specified
/// location or preferred location of the specified Expr.
class ApplyDebugLocation {
private:
void init(SourceLocation TemporaryLocation);
protected:
llvm::DebugLoc OriginalLocation;
CodeGenFunction &CGF;
public:
/// If TemporaryLocation is invalid, the IRBuilder will be set to not attach
/// debug locations, thus marking the instructions as prologue.
ApplyDebugLocation(CodeGenFunction &CGF,
SourceLocation TemporaryLocation = SourceLocation());
ApplyDebugLocation(CodeGenFunction &CGF, const Expr *E);
ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc);
~ApplyDebugLocation();
};
/// \brief An RAII object that temporarily switches to
/// an artificial debug location that has a valid scope, but no line
/// information. This is 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.
///
/// This is necessary because passing an empty SourceLocation to
/// CGDebugInfo::setLocation() will result in the last valid location
/// being reused.
class ArtificialLocation : public ApplyDebugLocation {
public:
ArtificialLocation(CodeGenFunction &CGF);
};
} // namespace CodeGen
} // namespace clang
#endif
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