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

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//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This coordinates the debug information generation while generating code.
//
//===----------------------------------------------------------------------===//
#include "CGDebugInfo.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/RecordLayout.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/Version.h"
#include "clang/CodeGen/CodeGenOptions.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/Module.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/System/Path.h"
#include "llvm/Target/TargetMachine.h"
using namespace clang;
using namespace clang::CodeGen;
CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
: CGM(CGM), DebugFactory(CGM.getModule()),
FwdDeclCount(0), BlockLiteralGenericSet(false) {
CreateCompileUnit();
}
CGDebugInfo::~CGDebugInfo() {
assert(RegionStack.empty() && "Region stack mismatch, stack not empty!");
}
void CGDebugInfo::setLocation(SourceLocation Loc) {
if (Loc.isValid())
CurLoc = CGM.getContext().getSourceManager().getInstantiationLoc(Loc);
}
/// getContextDescriptor - Get context info for the decl.
llvm::DIDescriptor CGDebugInfo::getContextDescriptor(const Decl *Context,
llvm::DIDescriptor &CompileUnit) {
if (!Context)
return CompileUnit;
llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator
I = RegionMap.find(Context);
if (I != RegionMap.end())
return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(I->second));
// Check namespace.
if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
return llvm::DIDescriptor(getOrCreateNameSpace(NSDecl, CompileUnit));
if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context)) {
if (!RDecl->isDependentType()) {
llvm::DIType Ty = getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
llvm::DIFile(CompileUnit));
return llvm::DIDescriptor(Ty);
}
}
return CompileUnit;
}
/// getFunctionName - Get function name for the given FunctionDecl. If the
/// name is constructred on demand (e.g. C++ destructor) then the name
/// is stored on the side.
llvm::StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
assert (FD && "Invalid FunctionDecl!");
IdentifierInfo *FII = FD->getIdentifier();
if (FII)
return FII->getName();
// Otherwise construct human readable name for debug info.
std::string NS = FD->getNameAsString();
// Copy this name on the side and use its reference.
char *StrPtr = DebugInfoNames.Allocate<char>(NS.length());
memcpy(StrPtr, NS.data(), NS.length());
return llvm::StringRef(StrPtr, NS.length());
}
/// getOrCreateFile - Get the file debug info descriptor for the input location.
llvm::DIFile CGDebugInfo::getOrCreateFile(SourceLocation Loc) {
if (!Loc.isValid())
// If Location is not valid then use main input file.
return DebugFactory.CreateFile(TheCU.getFilename(), TheCU.getDirectory(),
TheCU);
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc);
// Cache the results.
const char *fname = PLoc.getFilename();
llvm::DenseMap<const char *, llvm::WeakVH>::iterator it =
DIFileCache.find(fname);
if (it != DIFileCache.end()) {
// Verify that the information still exists.
if (&*it->second)
return llvm::DIFile(cast<llvm::MDNode>(it->second));
}
// FIXME: We shouldn't even need to call 'makeAbsolute()' in the cases
// where we can consult the FileEntry.
llvm::sys::Path AbsFileName(PLoc.getFilename());
AbsFileName.makeAbsolute();
llvm::DIFile F = DebugFactory.CreateFile(AbsFileName.getLast(),
AbsFileName.getDirname(), TheCU);
DIFileCache[fname] = F;
return F;
}
/// getLineNumber - Get line number for the location. If location is invalid
/// then use current location.
unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
assert (CurLoc.isValid() && "Invalid current location!");
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
return PLoc.getLine();
}
/// getColumnNumber - Get column number for the location. If location is
/// invalid then use current location.
unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc) {
assert (CurLoc.isValid() && "Invalid current location!");
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
return PLoc.getColumn();
}
/// CreateCompileUnit - Create new compile unit.
void CGDebugInfo::CreateCompileUnit() {
// Get absolute path name.
SourceManager &SM = CGM.getContext().getSourceManager();
std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
if (MainFileName.empty())
MainFileName = "<unknown>";
llvm::sys::Path AbsFileName(MainFileName);
AbsFileName.makeAbsolute();
// The main file name provided via the "-main-file-name" option contains just
// the file name itself with no path information. This file name may have had
// a relative path, so we look into the actual file entry for the main
// file to determine the real absolute path for the file.
std::string MainFileDir;
if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID()))
MainFileDir = MainFile->getDir()->getName();
else
MainFileDir = AbsFileName.getDirname();
unsigned LangTag;
const LangOptions &LO = CGM.getLangOptions();
if (LO.CPlusPlus) {
if (LO.ObjC1)
LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
else
LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
} else if (LO.ObjC1) {
LangTag = llvm::dwarf::DW_LANG_ObjC;
} else if (LO.C99) {
LangTag = llvm::dwarf::DW_LANG_C99;
} else {
LangTag = llvm::dwarf::DW_LANG_C89;
}
const char *Producer =
#ifdef CLANG_VENDOR
CLANG_VENDOR
#endif
"clang " CLANG_VERSION_STRING;
// Figure out which version of the ObjC runtime we have.
unsigned RuntimeVers = 0;
if (LO.ObjC1)
RuntimeVers = LO.ObjCNonFragileABI ? 2 : 1;
// Create new compile unit.
TheCU = DebugFactory.CreateCompileUnit(
LangTag, AbsFileName.getLast(), MainFileDir, Producer, true,
LO.Optimize, CGM.getCodeGenOpts().DwarfDebugFlags, RuntimeVers);
}
/// CreateType - Get the Basic type from the cache or create a new
/// one if necessary.
llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT,
llvm::DIFile Unit) {
unsigned Encoding = 0;
switch (BT->getKind()) {
default:
case BuiltinType::Void:
return llvm::DIType();
case BuiltinType::UChar:
case BuiltinType::Char_U: Encoding = llvm::dwarf::DW_ATE_unsigned_char; break;
case BuiltinType::Char_S:
case BuiltinType::SChar: Encoding = llvm::dwarf::DW_ATE_signed_char; break;
case BuiltinType::UShort:
case BuiltinType::UInt:
case BuiltinType::ULong:
case BuiltinType::ULongLong: Encoding = llvm::dwarf::DW_ATE_unsigned; break;
case BuiltinType::Short:
case BuiltinType::Int:
case BuiltinType::Long:
case BuiltinType::LongLong: Encoding = llvm::dwarf::DW_ATE_signed; break;
case BuiltinType::Bool: Encoding = llvm::dwarf::DW_ATE_boolean; break;
case BuiltinType::Float:
case BuiltinType::LongDouble:
case BuiltinType::Double: Encoding = llvm::dwarf::DW_ATE_float; break;
}
// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(BT);
uint64_t Align = CGM.getContext().getTypeAlign(BT);
uint64_t Offset = 0;
llvm::DIType DbgTy =
DebugFactory.CreateBasicType(Unit,
BT->getName(CGM.getContext().getLangOptions()),
Unit, 0, Size, Align,
Offset, /*flags*/ 0, Encoding);
return DbgTy;
}
llvm::DIType CGDebugInfo::CreateType(const ComplexType *Ty,
llvm::DIFile Unit) {
// Bit size, align and offset of the type.
unsigned Encoding = llvm::dwarf::DW_ATE_complex_float;
if (Ty->isComplexIntegerType())
Encoding = llvm::dwarf::DW_ATE_lo_user;
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
uint64_t Offset = 0;
llvm::DIType DbgTy =
DebugFactory.CreateBasicType(Unit, "complex",
Unit, 0, Size, Align,
Offset, /*flags*/ 0, Encoding);
return DbgTy;
}
/// CreateCVRType - Get the qualified type from the cache or create
/// a new one if necessary.
llvm::DIType CGDebugInfo::CreateQualifiedType(QualType Ty, llvm::DIFile Unit) {
QualifierCollector Qc;
const Type *T = Qc.strip(Ty);
// Ignore these qualifiers for now.
Qc.removeObjCGCAttr();
Qc.removeAddressSpace();
// We will create one Derived type for one qualifier and recurse to handle any
// additional ones.
unsigned Tag;
if (Qc.hasConst()) {
Tag = llvm::dwarf::DW_TAG_const_type;
Qc.removeConst();
} else if (Qc.hasVolatile()) {
Tag = llvm::dwarf::DW_TAG_volatile_type;
Qc.removeVolatile();
} else if (Qc.hasRestrict()) {
Tag = llvm::dwarf::DW_TAG_restrict_type;
Qc.removeRestrict();
} else {
assert(Qc.empty() && "Unknown type qualifier for debug info");
return getOrCreateType(QualType(T, 0), Unit);
}
llvm::DIType FromTy = getOrCreateType(Qc.apply(T), Unit);
// No need to fill in the Name, Line, Size, Alignment, Offset in case of
// CVR derived types.
llvm::DIType DbgTy =
DebugFactory.CreateDerivedType(Tag, Unit, "", Unit,
0, 0, 0, 0, 0, FromTy);
return DbgTy;
}
llvm::DIType CGDebugInfo::CreateType(const ObjCObjectPointerType *Ty,
llvm::DIFile Unit) {
llvm::DIType DbgTy =
CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
Ty->getPointeeType(), Unit);
return DbgTy;
}
llvm::DIType CGDebugInfo::CreateType(const PointerType *Ty,
llvm::DIFile Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_pointer_type, Ty,
Ty->getPointeeType(), Unit);
}
llvm::DIType CGDebugInfo::CreatePointerLikeType(unsigned Tag,
const Type *Ty,
QualType PointeeTy,
llvm::DIFile Unit) {
llvm::DIType EltTy = getOrCreateType(PointeeTy, Unit);
// Bit size, align and offset of the type.
// Size is always the size of a pointer. We can't use getTypeSize here
// because that does not return the correct value for references.
uint64_t Size =
CGM.getContext().Target.getPointerWidth(PointeeTy.getAddressSpace());
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
return
DebugFactory.CreateDerivedType(Tag, Unit, "", Unit,
0, Size, Align, 0, 0, EltTy);
}
llvm::DIType CGDebugInfo::CreateType(const BlockPointerType *Ty,
llvm::DIFile Unit) {
if (BlockLiteralGenericSet)
return BlockLiteralGeneric;
unsigned Tag = llvm::dwarf::DW_TAG_structure_type;
llvm::SmallVector<llvm::DIDescriptor, 5> EltTys;
llvm::DIType FieldTy;
QualType FType;
uint64_t FieldSize, FieldOffset;
unsigned FieldAlign;
llvm::DIArray Elements;
llvm::DIType EltTy, DescTy;
FieldOffset = 0;
FType = CGM.getContext().UnsignedLongTy;
EltTys.push_back(CreateMemberType(Unit, FType, "reserved", &FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "Size", &FieldOffset));
Elements = DebugFactory.GetOrCreateArray(EltTys.data(), EltTys.size());
EltTys.clear();
unsigned Flags = llvm::DIType::FlagAppleBlock;
unsigned LineNo = getLineNumber(CurLoc);
EltTy = DebugFactory.CreateCompositeType(Tag, Unit, "__block_descriptor",
Unit, LineNo, FieldOffset, 0, 0,
Flags, llvm::DIType(), Elements);
// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
DescTy = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_pointer_type,
Unit, "", Unit,
LineNo, Size, Align, 0, 0, EltTy);
FieldOffset = 0;
FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
FType = CGM.getContext().IntTy;
EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "__reserved", &FieldOffset));
FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
EltTys.push_back(CreateMemberType(Unit, FType, "__FuncPtr", &FieldOffset));
FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
FieldTy = DescTy;
FieldSize = CGM.getContext().getTypeSize(Ty);
FieldAlign = CGM.getContext().getTypeAlign(Ty);
FieldTy = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, Unit,
"__descriptor", Unit,
LineNo, FieldSize, FieldAlign,
FieldOffset, 0, FieldTy);
EltTys.push_back(FieldTy);
FieldOffset += FieldSize;
Elements = DebugFactory.GetOrCreateArray(EltTys.data(), EltTys.size());
EltTy = DebugFactory.CreateCompositeType(Tag, Unit, "__block_literal_generic",
Unit, LineNo, FieldOffset, 0, 0,
Flags, llvm::DIType(), Elements);
BlockLiteralGenericSet = true;
BlockLiteralGeneric
= DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_pointer_type, Unit,
"", Unit,
LineNo, Size, Align, 0, 0, EltTy);
return BlockLiteralGeneric;
}
llvm::DIType CGDebugInfo::CreateType(const TypedefType *Ty,
llvm::DIFile Unit) {
// Typedefs are derived from some other type. If we have a typedef of a
// typedef, make sure to emit the whole chain.
llvm::DIType Src = getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit);
// We don't set size information, but do specify where the typedef was
// declared.
unsigned Line = getLineNumber(Ty->getDecl()->getLocation());
llvm::DIDescriptor TyContext
= getContextDescriptor(dyn_cast<Decl>(Ty->getDecl()->getDeclContext()),
Unit);
llvm::DIType DbgTy =
DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_typedef,
TyContext,
Ty->getDecl()->getName(), Unit,
Line, 0, 0, 0, 0, Src);
return DbgTy;
}
llvm::DIType CGDebugInfo::CreateType(const FunctionType *Ty,
llvm::DIFile Unit) {
llvm::SmallVector<llvm::DIDescriptor, 16> EltTys;
// Add the result type at least.
EltTys.push_back(getOrCreateType(Ty->getResultType(), Unit));
// Set up remainder of arguments if there is a prototype.
// FIXME: IF NOT, HOW IS THIS REPRESENTED? llvm-gcc doesn't represent '...'!
if (const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(Ty)) {
for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
EltTys.push_back(getOrCreateType(FTP->getArgType(i), Unit));
} else {
// FIXME: Handle () case in C. llvm-gcc doesn't do it either.
}
llvm::DIArray EltTypeArray =
DebugFactory.GetOrCreateArray(EltTys.data(), EltTys.size());
llvm::DIType DbgTy =
DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_subroutine_type,
Unit, "", Unit,
0, 0, 0, 0, 0,
llvm::DIType(), EltTypeArray);
return DbgTy;
}
/// CollectRecordFields - A helper function to collect debug info for
/// record fields. This is used while creating debug info entry for a Record.
void CGDebugInfo::
CollectRecordFields(const RecordDecl *RD, llvm::DIFile Unit,
llvm::SmallVectorImpl<llvm::DIDescriptor> &EltTys) {
unsigned FieldNo = 0;
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
for (RecordDecl::field_iterator I = RD->field_begin(),
E = RD->field_end();
I != E; ++I, ++FieldNo) {
FieldDecl *Field = *I;
llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
llvm::StringRef FieldName = Field->getName();
// Ignore unnamed fields. Do not ignore unnamed records.
if (FieldName.empty() && !isa<RecordType>(Field->getType()))
continue;
// Get the location for the field.
llvm::DIFile FieldDefUnit = getOrCreateFile(Field->getLocation());
unsigned FieldLine = getLineNumber(Field->getLocation());
QualType FType = Field->getType();
uint64_t FieldSize = 0;
unsigned FieldAlign = 0;
if (!FType->isIncompleteArrayType()) {
// Bit size, align and offset of the type.
FieldSize = CGM.getContext().getTypeSize(FType);
Expr *BitWidth = Field->getBitWidth();
if (BitWidth)
FieldSize = BitWidth->EvaluateAsInt(CGM.getContext()).getZExtValue();
FieldAlign = CGM.getContext().getTypeAlign(FType);
}
uint64_t FieldOffset = RL.getFieldOffset(FieldNo);
unsigned Flags = 0;
AccessSpecifier Access = I->getAccess();
if (Access == clang::AS_private)
Flags |= llvm::DIType::FlagPrivate;
else if (Access == clang::AS_protected)
Flags |= llvm::DIType::FlagProtected;
// Create a DW_TAG_member node to remember the offset of this field in the
// struct. FIXME: This is an absolutely insane way to capture this
// information. When we gut debug info, this should be fixed.
FieldTy = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, Unit,
FieldName, FieldDefUnit,
FieldLine, FieldSize, FieldAlign,
FieldOffset, Flags, FieldTy);
EltTys.push_back(FieldTy);
}
}
/// getOrCreateMethodType - CXXMethodDecl's type is a FunctionType. This
/// function type is not updated to include implicit "this" pointer. Use this
/// routine to get a method type which includes "this" pointer.
llvm::DIType
CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
llvm::DIFile Unit) {
llvm::DIType FnTy
= getOrCreateType(QualType(Method->getType()->getAs<FunctionProtoType>(),
0),
Unit);
// Static methods do not need "this" pointer argument.
if (Method->isStatic())
return FnTy;
// Add "this" pointer.
llvm::DIArray Args = llvm::DICompositeType(FnTy).getTypeArray();
assert (Args.getNumElements() && "Invalid number of arguments!");
llvm::SmallVector<llvm::DIDescriptor, 16> Elts;
// First element is always return type. For 'void' functions it is NULL.
Elts.push_back(Args.getElement(0));
// "this" pointer is always first argument.
ASTContext &Context = CGM.getContext();
QualType ThisPtr =
Context.getPointerType(Context.getTagDeclType(Method->getParent()));
llvm::DIType ThisPtrType =
DebugFactory.CreateArtificialType(getOrCreateType(ThisPtr, Unit));
TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
Elts.push_back(ThisPtrType);
// Copy rest of the arguments.
for (unsigned i = 1, e = Args.getNumElements(); i != e; ++i)
Elts.push_back(Args.getElement(i));
llvm::DIArray EltTypeArray =
DebugFactory.GetOrCreateArray(Elts.data(), Elts.size());
return
DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_subroutine_type,
Unit, "", Unit,
0, 0, 0, 0, 0,
llvm::DIType(), EltTypeArray);
}
/// CreateCXXMemberFunction - A helper function to create a DISubprogram for
/// a single member function GlobalDecl.
llvm::DISubprogram
CGDebugInfo::CreateCXXMemberFunction(const CXXMethodDecl *Method,
llvm::DIFile Unit,
llvm::DICompositeType &RecordTy) {
bool IsCtorOrDtor =
isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
llvm::StringRef MethodName = getFunctionName(Method);
llvm::DIType MethodTy = getOrCreateMethodType(Method, Unit);
// Since a single ctor/dtor corresponds to multiple functions, it doesn't
// make sense to give a single ctor/dtor a linkage name.
MangleBuffer MethodLinkageName;
if (!IsCtorOrDtor)
CGM.getMangledName(MethodLinkageName, Method);
// Get the location for the method.
llvm::DIFile MethodDefUnit = getOrCreateFile(Method->getLocation());
unsigned MethodLine = getLineNumber(Method->getLocation());
// Collect virtual method info.
llvm::DIType ContainingType;
unsigned Virtuality = 0;
unsigned VIndex = 0;
if (Method->isVirtual()) {
if (Method->isPure())
Virtuality = llvm::dwarf::DW_VIRTUALITY_pure_virtual;
else
Virtuality = llvm::dwarf::DW_VIRTUALITY_virtual;
// It doesn't make sense to give a virtual destructor a vtable index,
// since a single destructor has two entries in the vtable.
if (!isa<CXXDestructorDecl>(Method))
VIndex = CGM.getVTables().getMethodVTableIndex(Method);
ContainingType = RecordTy;
}
llvm::DISubprogram SP =
DebugFactory.CreateSubprogram(RecordTy , MethodName, MethodName,
MethodLinkageName,
MethodDefUnit, MethodLine,
MethodTy, /*isLocalToUnit=*/false,
Method->isThisDeclarationADefinition(),
Virtuality, VIndex, ContainingType);
// Don't cache ctors or dtors since we have to emit multiple functions for
// a single ctor or dtor.
if (!IsCtorOrDtor && Method->isThisDeclarationADefinition())
SPCache[Method] = llvm::WeakVH(SP);
return SP;
}
/// CollectCXXMemberFunctions - A helper function to collect debug info for
/// C++ member functions.This is used while creating debug info entry for
/// a Record.
void CGDebugInfo::
CollectCXXMemberFunctions(const CXXRecordDecl *RD, llvm::DIFile Unit,
llvm::SmallVectorImpl<llvm::DIDescriptor> &EltTys,
llvm::DICompositeType &RecordTy) {
for(CXXRecordDecl::method_iterator I = RD->method_begin(),
E = RD->method_end(); I != E; ++I) {
const CXXMethodDecl *Method = *I;
if (Method->isImplicit() && !Method->isUsed())
continue;
EltTys.push_back(CreateCXXMemberFunction(Method, Unit, RecordTy));
}
}
/// CollectCXXBases - A helper function to collect debug info for
/// C++ base classes. This is used while creating debug info entry for
/// a Record.
void CGDebugInfo::
CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile Unit,
llvm::SmallVectorImpl<llvm::DIDescriptor> &EltTys,
llvm::DICompositeType &RecordTy) {
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
for (CXXRecordDecl::base_class_const_iterator BI = RD->bases_begin(),
BE = RD->bases_end(); BI != BE; ++BI) {
unsigned BFlags = 0;
uint64_t BaseOffset;
const CXXRecordDecl *Base =
cast<CXXRecordDecl>(BI->getType()->getAs<RecordType>()->getDecl());
if (BI->isVirtual()) {
// virtual base offset offset is -ve. The code generator emits dwarf
// expression where it expects +ve number.
BaseOffset = 0 - CGM.getVTables().getVirtualBaseOffsetOffset(RD, Base);
BFlags = llvm::DIType::FlagVirtual;
} else
BaseOffset = RL.getBaseClassOffset(Base);
AccessSpecifier Access = BI->getAccessSpecifier();
if (Access == clang::AS_private)
BFlags |= llvm::DIType::FlagPrivate;
else if (Access == clang::AS_protected)
BFlags |= llvm::DIType::FlagProtected;
llvm::DIType DTy =
DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_inheritance,
RecordTy, llvm::StringRef(),
Unit, 0, 0, 0,
BaseOffset, BFlags,
getOrCreateType(BI->getType(),
Unit));
EltTys.push_back(DTy);
}
}
/// getOrCreateVTablePtrType - Return debug info descriptor for vtable.
llvm::DIType CGDebugInfo::getOrCreateVTablePtrType(llvm::DIFile Unit) {
if (VTablePtrType.isValid())
return VTablePtrType;
ASTContext &Context = CGM.getContext();
/* Function type */
llvm::DIDescriptor STy = getOrCreateType(Context.IntTy, Unit);
llvm::DIArray SElements = DebugFactory.GetOrCreateArray(&STy, 1);
llvm::DIType SubTy =
DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_subroutine_type,
Unit, "", Unit,
0, 0, 0, 0, 0, llvm::DIType(), SElements);
unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
llvm::DIType vtbl_ptr_type
= DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_pointer_type,
Unit, "__vtbl_ptr_type", Unit,
0, Size, 0, 0, 0, SubTy);
VTablePtrType =
DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_pointer_type,
Unit, "", Unit,
0, Size, 0, 0, 0, vtbl_ptr_type);
return VTablePtrType;
}
/// getVTableName - Get vtable name for the given Class.
llvm::StringRef CGDebugInfo::getVTableName(const CXXRecordDecl *RD) {
// Otherwise construct gdb compatible name name.
std::string Name = "_vptr$" + RD->getNameAsString();
// Copy this name on the side and use its reference.
char *StrPtr = DebugInfoNames.Allocate<char>(Name.length());
memcpy(StrPtr, Name.data(), Name.length());
return llvm::StringRef(StrPtr, Name.length());
}
/// CollectVTableInfo - If the C++ class has vtable info then insert appropriate
/// debug info entry in EltTys vector.
void CGDebugInfo::
CollectVTableInfo(const CXXRecordDecl *RD, llvm::DIFile Unit,
llvm::SmallVectorImpl<llvm::DIDescriptor> &EltTys) {
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
// If there is a primary base then it will hold vtable info.
if (RL.getPrimaryBase())
return;
// If this class is not dynamic then there is not any vtable info to collect.
if (!RD->isDynamicClass())
return;
unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
llvm::DIType VPTR
= DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, Unit,
getVTableName(RD), Unit,
0, Size, 0, 0, 0,
getOrCreateVTablePtrType(Unit));
EltTys.push_back(VPTR);
}
/// CreateType - get structure or union type.
llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty,
llvm::DIFile Unit) {
RecordDecl *RD = Ty->getDecl();
unsigned Tag;
if (RD->isStruct())
Tag = llvm::dwarf::DW_TAG_structure_type;
else if (RD->isUnion())
Tag = llvm::dwarf::DW_TAG_union_type;
else {
assert(RD->isClass() && "Unknown RecordType!");
Tag = llvm::dwarf::DW_TAG_class_type;
}
// Get overall information about the record type for the debug info.
llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
unsigned Line = getLineNumber(RD->getLocation());
// Records and classes and unions can all be recursive. To handle them, we
// first generate a debug descriptor for the struct as a forward declaration.
// Then (if it is a definition) we go through and get debug info for all of
// its members. Finally, we create a descriptor for the complete type (which
// may refer to the forward decl if the struct is recursive) and replace all
// uses of the forward declaration with the final definition.
// A RD->getName() is not unique. However, the debug info descriptors
// are uniqued so use type name to ensure uniquness.
llvm::SmallString<128> FwdDeclName;
llvm::raw_svector_ostream(FwdDeclName) << "fwd.type." << FwdDeclCount++;
llvm::DIDescriptor FDContext =
getContextDescriptor(dyn_cast<Decl>(RD->getDeclContext()), Unit);
llvm::DICompositeType FwdDecl =
DebugFactory.CreateCompositeType(Tag, FDContext, FwdDeclName,
DefUnit, Line, 0, 0, 0, 0,
llvm::DIType(), llvm::DIArray());
// If this is just a forward declaration, return it.
if (!RD->getDefinition())
return FwdDecl;
llvm::MDNode *MN = FwdDecl;
llvm::TrackingVH<llvm::MDNode> FwdDeclNode = MN;
// Otherwise, insert it into the TypeCache so that recursive uses will find
// it.
TypeCache[QualType(Ty, 0).getAsOpaquePtr()] = FwdDecl;
// Push the struct on region stack.
RegionStack.push_back(FwdDeclNode);
RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
// Convert all the elements.
llvm::SmallVector<llvm::DIDescriptor, 16> EltTys;
const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
if (CXXDecl) {
CollectCXXBases(CXXDecl, Unit, EltTys, FwdDecl);
CollectVTableInfo(CXXDecl, Unit, EltTys);
}
CollectRecordFields(RD, Unit, EltTys);
llvm::MDNode *ContainingType = NULL;
if (CXXDecl) {
CollectCXXMemberFunctions(CXXDecl, Unit, EltTys, FwdDecl);
// A class's primary base or the class itself contains the vtable.
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
if (const CXXRecordDecl *PBase = RL.getPrimaryBase())
ContainingType =
getOrCreateType(QualType(PBase->getTypeForDecl(), 0), Unit);
else if (CXXDecl->isDynamicClass())
ContainingType = FwdDecl;
}
llvm::DIArray Elements =
DebugFactory.GetOrCreateArray(EltTys.data(), EltTys.size());
// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
RegionStack.pop_back();
llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator RI =
RegionMap.find(Ty->getDecl());
if (RI != RegionMap.end())
RegionMap.erase(RI);
llvm::DIDescriptor RDContext =
getContextDescriptor(dyn_cast<Decl>(RD->getDeclContext()), Unit);
llvm::DICompositeType RealDecl =
DebugFactory.CreateCompositeType(Tag, RDContext,
RD->getName(),
DefUnit, Line, Size, Align, 0, 0,
llvm::DIType(), Elements,
0, ContainingType);
// Now that we have a real decl for the struct, replace anything using the
// old decl with the new one. This will recursively update the debug info.
llvm::DIDerivedType(FwdDeclNode).replaceAllUsesWith(RealDecl);
RegionMap[RD] = llvm::WeakVH(RealDecl);
return RealDecl;
}
/// CreateType - get objective-c object type.
llvm::DIType CGDebugInfo::CreateType(const ObjCObjectType *Ty,
llvm::DIFile Unit) {
// Ignore protocols.
return getOrCreateType(Ty->getBaseType(), Unit);
}
/// CreateType - get objective-c interface type.
llvm::DIType CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
llvm::DIFile Unit) {
ObjCInterfaceDecl *ID = Ty->getDecl();
unsigned Tag = llvm::dwarf::DW_TAG_structure_type;
// Get overall information about the record type for the debug info.
llvm::DIFile DefUnit = getOrCreateFile(ID->getLocation());
unsigned Line = getLineNumber(ID->getLocation());
unsigned RuntimeLang = TheCU.getLanguage();
// To handle recursive interface, we
// first generate a debug descriptor for the struct as a forward declaration.
// Then (if it is a definition) we go through and get debug info for all of
// its members. Finally, we create a descriptor for the complete type (which
// may refer to the forward decl if the struct is recursive) and replace all
// uses of the forward declaration with the final definition.
llvm::DICompositeType FwdDecl =
DebugFactory.CreateCompositeType(Tag, Unit, ID->getName(),
DefUnit, Line, 0, 0, 0, 0,
llvm::DIType(), llvm::DIArray(),
RuntimeLang);
// If this is just a forward declaration, return it.
if (ID->isForwardDecl())
return FwdDecl;
llvm::MDNode *MN = FwdDecl;
llvm::TrackingVH<llvm::MDNode> FwdDeclNode = MN;
// Otherwise, insert it into the TypeCache so that recursive uses will find
// it.
TypeCache[QualType(Ty, 0).getAsOpaquePtr()] = FwdDecl;
// Push the struct on region stack.
RegionStack.push_back(FwdDeclNode);
RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
// Convert all the elements.
llvm::SmallVector<llvm::DIDescriptor, 16> EltTys;
ObjCInterfaceDecl *SClass = ID->getSuperClass();
if (SClass) {
llvm::DIType SClassTy =
getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
llvm::DIType InhTag =
DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_inheritance,
Unit, "", Unit, 0, 0, 0,
0 /* offset */, 0, SClassTy);
EltTys.push_back(InhTag);
}
const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
unsigned FieldNo = 0;
for (ObjCInterfaceDecl::ivar_iterator I = ID->ivar_begin(),
E = ID->ivar_end(); I != E; ++I, ++FieldNo) {
ObjCIvarDecl *Field = *I;
llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
llvm::StringRef FieldName = Field->getName();
// Ignore unnamed fields.
if (FieldName.empty())
continue;
// Get the location for the field.
llvm::DIFile FieldDefUnit = getOrCreateFile(Field->getLocation());
unsigned FieldLine = getLineNumber(Field->getLocation());
QualType FType = Field->getType();
uint64_t FieldSize = 0;
unsigned FieldAlign = 0;
if (!FType->isIncompleteArrayType()) {
// Bit size, align and offset of the type.
FieldSize = CGM.getContext().getTypeSize(FType);
Expr *BitWidth = Field->getBitWidth();
if (BitWidth)
FieldSize = BitWidth->EvaluateAsInt(CGM.getContext()).getZExtValue();
FieldAlign = CGM.getContext().getTypeAlign(FType);
}
uint64_t FieldOffset = RL.getFieldOffset(FieldNo);
unsigned Flags = 0;
if (Field->getAccessControl() == ObjCIvarDecl::Protected)
Flags = llvm::DIType::FlagProtected;
else if (Field->getAccessControl() == ObjCIvarDecl::Private)
Flags = llvm::DIType::FlagPrivate;
// Create a DW_TAG_member node to remember the offset of this field in the
// struct. FIXME: This is an absolutely insane way to capture this
// information. When we gut debug info, this should be fixed.
FieldTy = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, Unit,
FieldName, FieldDefUnit,
FieldLine, FieldSize, FieldAlign,
FieldOffset, Flags, FieldTy);
EltTys.push_back(FieldTy);
}
llvm::DIArray Elements =
DebugFactory.GetOrCreateArray(EltTys.data(), EltTys.size());
RegionStack.pop_back();
llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator RI =
RegionMap.find(Ty->getDecl());
if (RI != RegionMap.end())
RegionMap.erase(RI);
// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
llvm::DICompositeType RealDecl =
DebugFactory.CreateCompositeType(Tag, Unit, ID->getName(), DefUnit,
Line, Size, Align, 0, 0, llvm::DIType(),
Elements, RuntimeLang);
// Now that we have a real decl for the struct, replace anything using the
// old decl with the new one. This will recursively update the debug info.
llvm::DIDerivedType(FwdDeclNode).replaceAllUsesWith(RealDecl);
RegionMap[ID] = llvm::WeakVH(RealDecl);
return RealDecl;
}
llvm::DIType CGDebugInfo::CreateType(const EnumType *Ty,
llvm::DIFile Unit) {
EnumDecl *ED = Ty->getDecl();
llvm::SmallVector<llvm::DIDescriptor, 32> Enumerators;
// Create DIEnumerator elements for each enumerator.
for (EnumDecl::enumerator_iterator
Enum = ED->enumerator_begin(), EnumEnd = ED->enumerator_end();
Enum != EnumEnd; ++Enum) {
Enumerators.push_back(DebugFactory.CreateEnumerator(Enum->getName(),
Enum->getInitVal().getZExtValue()));
}
// Return a CompositeType for the enum itself.
llvm::DIArray EltArray =
DebugFactory.GetOrCreateArray(Enumerators.data(), Enumerators.size());
llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
unsigned Line = getLineNumber(ED->getLocation());
// Size and align of the type.
uint64_t Size = 0;
unsigned Align = 0;
if (!Ty->isIncompleteType()) {
Size = CGM.getContext().getTypeSize(Ty);
Align = CGM.getContext().getTypeAlign(Ty);
}
llvm::DIType DbgTy =
DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_enumeration_type,
Unit, ED->getName(), DefUnit, Line,
Size, Align, 0, 0,
llvm::DIType(), EltArray);
return DbgTy;
}
llvm::DIType CGDebugInfo::CreateType(const TagType *Ty,
llvm::DIFile Unit) {
if (const RecordType *RT = dyn_cast<RecordType>(Ty))
return CreateType(RT, Unit);
else if (const EnumType *ET = dyn_cast<EnumType>(Ty))
return CreateType(ET, Unit);
return llvm::DIType();
}
llvm::DIType CGDebugInfo::CreateType(const VectorType *Ty,
llvm::DIFile Unit) {
llvm::DIType ElementTy = getOrCreateType(Ty->getElementType(), Unit);
uint64_t NumElems = Ty->getNumElements();
if (NumElems > 0)
--NumElems;
llvm::DIDescriptor Subscript = DebugFactory.GetOrCreateSubrange(0, NumElems);
llvm::DIArray SubscriptArray = DebugFactory.GetOrCreateArray(&Subscript, 1);
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
return
DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_vector_type,
Unit, "", Unit,
0, Size, Align, 0, 0,
ElementTy, SubscriptArray);
}
llvm::DIType CGDebugInfo::CreateType(const ArrayType *Ty,
llvm::DIFile Unit) {
uint64_t Size;
uint64_t Align;
// FIXME: make getTypeAlign() aware of VLAs and incomplete array types
if (const VariableArrayType *VAT = dyn_cast<VariableArrayType>(Ty)) {
Size = 0;
Align =
CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
} else if (Ty->isIncompleteArrayType()) {
Size = 0;
Align = CGM.getContext().getTypeAlign(Ty->getElementType());
} else {
// Size and align of the whole array, not the element type.
Size = CGM.getContext().getTypeSize(Ty);
Align = CGM.getContext().getTypeAlign(Ty);
}
// Add the dimensions of the array. FIXME: This loses CV qualifiers from
// interior arrays, do we care? Why aren't nested arrays represented the
// obvious/recursive way?
llvm::SmallVector<llvm::DIDescriptor, 8> Subscripts;
QualType EltTy(Ty, 0);
while ((Ty = dyn_cast<ArrayType>(EltTy))) {
uint64_t Upper = 0;
if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
if (CAT->getSize().getZExtValue())
Upper = CAT->getSize().getZExtValue() - 1;
// FIXME: Verify this is right for VLAs.
Subscripts.push_back(DebugFactory.GetOrCreateSubrange(0, Upper));
EltTy = Ty->getElementType();
}
llvm::DIArray SubscriptArray =
DebugFactory.GetOrCreateArray(Subscripts.data(), Subscripts.size());
llvm::DIType DbgTy =
DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_array_type,
Unit, "", Unit,
0, Size, Align, 0, 0,
getOrCreateType(EltTy, Unit),
SubscriptArray);
return DbgTy;
}
llvm::DIType CGDebugInfo::CreateType(const LValueReferenceType *Ty,
llvm::DIFile Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_reference_type,
Ty, Ty->getPointeeType(), Unit);
}
llvm::DIType CGDebugInfo::CreateType(const MemberPointerType *Ty,
llvm::DIFile U) {
QualType PointerDiffTy = CGM.getContext().getPointerDiffType();
llvm::DIType PointerDiffDITy = getOrCreateType(PointerDiffTy, U);
if (!Ty->getPointeeType()->isFunctionType()) {
// We have a data member pointer type.
return PointerDiffDITy;
}
// We have a member function pointer type. Treat it as a struct with two
// ptrdiff_t members.
std::pair<uint64_t, unsigned> Info = CGM.getContext().getTypeInfo(Ty);
uint64_t FieldOffset = 0;
llvm::DIDescriptor ElementTypes[2];
// FIXME: This should probably be a function type instead.
ElementTypes[0] =
DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, U,
"ptr", U, 0,
Info.first, Info.second, FieldOffset, 0,
PointerDiffDITy);
FieldOffset += Info.first;
ElementTypes[1] =
DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, U,
"ptr", U, 0,
Info.first, Info.second, FieldOffset, 0,
PointerDiffDITy);
llvm::DIArray Elements =
DebugFactory.GetOrCreateArray(&ElementTypes[0],
llvm::array_lengthof(ElementTypes));
return DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_structure_type,
U, llvm::StringRef("test"),
U, 0, FieldOffset,
0, 0, 0, llvm::DIType(), Elements);
}
static QualType UnwrapTypeForDebugInfo(QualType T) {
do {
QualType LastT = T;
switch (T->getTypeClass()) {
default:
return T;
case Type::TemplateSpecialization:
T = cast<TemplateSpecializationType>(T)->desugar();
break;
case Type::TypeOfExpr: {
TypeOfExprType *Ty = cast<TypeOfExprType>(T);
T = Ty->getUnderlyingExpr()->getType();
break;
}
case Type::TypeOf:
T = cast<TypeOfType>(T)->getUnderlyingType();
break;
case Type::Decltype:
T = cast<DecltypeType>(T)->getUnderlyingType();
break;
case Type::Elaborated:
T = cast<ElaboratedType>(T)->getNamedType();
break;
case Type::SubstTemplateTypeParm:
T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
break;
}
assert(T != LastT && "Type unwrapping failed to unwrap!");
if (T == LastT)
return T;
} while (true);
return T;
}
/// getOrCreateType - Get the type from the cache or create a new
/// one if necessary.
llvm::DIType CGDebugInfo::getOrCreateType(QualType Ty,
llvm::DIFile Unit) {
if (Ty.isNull())
return llvm::DIType();
// Unwrap the type as needed for debug information.
Ty = UnwrapTypeForDebugInfo(Ty);
// Check for existing entry.
llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
TypeCache.find(Ty.getAsOpaquePtr());
if (it != TypeCache.end()) {
// Verify that the debug info still exists.
if (&*it->second)
return llvm::DIType(cast<llvm::MDNode>(it->second));
}
// Otherwise create the type.
llvm::DIType Res = CreateTypeNode(Ty, Unit);
// And update the type cache.
TypeCache[Ty.getAsOpaquePtr()] = Res;
return Res;
}
/// CreateTypeNode - Create a new debug type node.
llvm::DIType CGDebugInfo::CreateTypeNode(QualType Ty,
llvm::DIFile Unit) {
// Handle qualifiers, which recursively handles what they refer to.
if (Ty.hasLocalQualifiers())
return CreateQualifiedType(Ty, Unit);
const char *Diag = 0;
// Work out details of type.
switch (Ty->getTypeClass()) {
#define TYPE(Class, Base)
#define ABSTRACT_TYPE(Class, Base)
#define NON_CANONICAL_TYPE(Class, Base)
#define DEPENDENT_TYPE(Class, Base) case Type::Class:
#include "clang/AST/TypeNodes.def"
assert(false && "Dependent types cannot show up in debug information");
// FIXME: Handle these.
case Type::ExtVector:
return llvm::DIType();
case Type::Vector:
return CreateType(cast<VectorType>(Ty), Unit);
case Type::ObjCObjectPointer:
return CreateType(cast<ObjCObjectPointerType>(Ty), Unit);
case Type::ObjCObject:
return CreateType(cast<ObjCObjectType>(Ty), Unit);
case Type::ObjCInterface:
return CreateType(cast<ObjCInterfaceType>(Ty), Unit);
case Type::Builtin: return CreateType(cast<BuiltinType>(Ty), Unit);
case Type::Complex: return CreateType(cast<ComplexType>(Ty), Unit);
case Type::Pointer: return CreateType(cast<PointerType>(Ty), Unit);
case Type::BlockPointer:
return CreateType(cast<BlockPointerType>(Ty), Unit);
case Type::Typedef: return CreateType(cast<TypedefType>(Ty), Unit);
case Type::Record:
case Type::Enum:
return CreateType(cast<TagType>(Ty), Unit);
case Type::FunctionProto:
case Type::FunctionNoProto:
return CreateType(cast<FunctionType>(Ty), Unit);
case Type::ConstantArray:
case Type::VariableArray:
case Type::IncompleteArray:
return CreateType(cast<ArrayType>(Ty), Unit);
case Type::LValueReference:
return CreateType(cast<LValueReferenceType>(Ty), Unit);
case Type::MemberPointer:
return CreateType(cast<MemberPointerType>(Ty), Unit);
case Type::TemplateSpecialization:
case Type::Elaborated:
case Type::SubstTemplateTypeParm:
case Type::TypeOfExpr:
case Type::TypeOf:
case Type::Decltype:
llvm_unreachable("type should have been unwrapped!");
return llvm::DIType();
case Type::RValueReference:
// FIXME: Implement!
Diag = "rvalue references";
break;
}
assert(Diag && "Fall through without a diagnostic?");
unsigned DiagID = CGM.getDiags().getCustomDiagID(Diagnostic::Error,
"debug information for %0 is not yet supported");
CGM.getDiags().Report(FullSourceLoc(), DiagID)
<< Diag;
return llvm::DIType();
}
/// CreateMemberType - Create new member and increase Offset by FType's size.
llvm::DIType CGDebugInfo::CreateMemberType(llvm::DIFile Unit, QualType FType,
llvm::StringRef Name,
uint64_t *Offset) {
llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
llvm::DIType Ty = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member,
Unit, Name, Unit, 0,
FieldSize, FieldAlign,
*Offset, 0, FieldTy);
*Offset += FieldSize;
return Ty;
}
/// EmitFunctionStart - Constructs the debug code for entering a function -
/// "llvm.dbg.func.start.".
void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, QualType FnType,
llvm::Function *Fn,
CGBuilderTy &Builder) {
llvm::StringRef Name;
MangleBuffer LinkageName;
const Decl *D = GD.getDecl();
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
// If there is a DISubprogram for this function available then use it.
llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
FI = SPCache.find(FD);
if (FI != SPCache.end()) {
llvm::DIDescriptor SP(dyn_cast_or_null<llvm::MDNode>(FI->second));
if (SP.isSubprogram() && llvm::DISubprogram(SP).isDefinition()) {
llvm::MDNode *SPN = SP;
RegionStack.push_back(SPN);
RegionMap[D] = llvm::WeakVH(SP);
return;
}
}
Name = getFunctionName(FD);
// Use mangled name as linkage name for c/c++ functions.
CGM.getMangledName(LinkageName, GD);
} else {
// Use llvm function name as linkage name.
Name = Fn->getName();
LinkageName.setString(Name);
}
if (!Name.empty() && Name[0] == '\01')
Name = Name.substr(1);
// It is expected that CurLoc is set before using EmitFunctionStart.
// Usually, CurLoc points to the left bracket location of compound
// statement representing function body.
llvm::DIFile Unit = getOrCreateFile(CurLoc);
unsigned LineNo = getLineNumber(CurLoc);
llvm::DISubprogram SP =
DebugFactory.CreateSubprogram(Unit, Name, Name, LinkageName, Unit, LineNo,
getOrCreateType(FnType, Unit),
Fn->hasInternalLinkage(), true/*definition*/);
// Push function on region stack.
llvm::MDNode *SPN = SP;
RegionStack.push_back(SPN);
RegionMap[D] = llvm::WeakVH(SP);
}
void CGDebugInfo::EmitStopPoint(llvm::Function *Fn, CGBuilderTy &Builder) {
if (CurLoc.isInvalid() || CurLoc.isMacroID()) return;
// Don't bother if things are the same as last time.
SourceManager &SM = CGM.getContext().getSourceManager();
if (CurLoc == PrevLoc
|| (SM.getInstantiationLineNumber(CurLoc) ==
SM.getInstantiationLineNumber(PrevLoc)
&& SM.isFromSameFile(CurLoc, PrevLoc)))
// New Builder may not be in sync with CGDebugInfo.
if (!Builder.getCurrentDebugLocation().isUnknown())
return;
// Update last state.
PrevLoc = CurLoc;
llvm::MDNode *Scope = RegionStack.back();
Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(getLineNumber(CurLoc),
getColumnNumber(CurLoc),
Scope));
}
/// EmitRegionStart- Constructs the debug code for entering a declarative
/// region - "llvm.dbg.region.start.".
void CGDebugInfo::EmitRegionStart(llvm::Function *Fn, CGBuilderTy &Builder) {
llvm::DIDescriptor D =
DebugFactory.CreateLexicalBlock(RegionStack.empty() ?
llvm::DIDescriptor() :
llvm::DIDescriptor(RegionStack.back()),
getLineNumber(CurLoc),
getColumnNumber(CurLoc));
llvm::MDNode *DN = D;
RegionStack.push_back(DN);
}
/// EmitRegionEnd - Constructs the debug code for exiting a declarative
/// region - "llvm.dbg.region.end."
void CGDebugInfo::EmitRegionEnd(llvm::Function *Fn, CGBuilderTy &Builder) {
assert(!RegionStack.empty() && "Region stack mismatch, stack empty!");
// Provide an region stop point.
EmitStopPoint(Fn, Builder);
RegionStack.pop_back();
}
// EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
// See BuildByRefType.
llvm::DIType CGDebugInfo::EmitTypeForVarWithBlocksAttr(const ValueDecl *VD,
uint64_t *XOffset) {
llvm::SmallVector<llvm::DIDescriptor, 5> EltTys;
QualType FType;
uint64_t FieldSize, FieldOffset;
unsigned FieldAlign;
llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
QualType Type = VD->getType();
FieldOffset = 0;
FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
FType = CGM.getContext().IntTy;
EltTys.push_back(CreateMemberType(Unit, FType, "__flags", &FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "__size", &FieldOffset));
bool HasCopyAndDispose = CGM.BlockRequiresCopying(Type);
if (HasCopyAndDispose) {
FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
EltTys.push_back(CreateMemberType(Unit, FType, "__copy_helper",
&FieldOffset));
EltTys.push_back(CreateMemberType(Unit, FType, "__destroy_helper",
&FieldOffset));
}
CharUnits Align = CGM.getContext().getDeclAlign(VD);
if (Align > CharUnits::fromQuantity(
CGM.getContext().Target.getPointerAlign(0) / 8)) {
unsigned AlignedOffsetInBytes
= llvm::RoundUpToAlignment(FieldOffset/8, Align.getQuantity());
unsigned NumPaddingBytes
= AlignedOffsetInBytes - FieldOffset/8;
if (NumPaddingBytes > 0) {
llvm::APInt pad(32, NumPaddingBytes);
FType = CGM.getContext().getConstantArrayType(CGM.getContext().CharTy,
pad, ArrayType::Normal, 0);
EltTys.push_back(CreateMemberType(Unit, FType, "", &FieldOffset));
}
}
FType = Type;
llvm::DIType FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
FieldSize = CGM.getContext().getTypeSize(FType);
FieldAlign = Align.getQuantity()*8;
*XOffset = FieldOffset;
FieldTy = DebugFactory.CreateDerivedType(llvm::dwarf::DW_TAG_member, Unit,
VD->getName(), Unit,
0, FieldSize, FieldAlign,
FieldOffset, 0, FieldTy);
EltTys.push_back(FieldTy);
FieldOffset += FieldSize;
llvm::DIArray Elements =
DebugFactory.GetOrCreateArray(EltTys.data(), EltTys.size());
unsigned Flags = llvm::DIType::FlagBlockByrefStruct;
return DebugFactory.CreateCompositeType(llvm::dwarf::DW_TAG_structure_type,
Unit, "", Unit,
0, FieldOffset, 0, 0, Flags,
llvm::DIType(), Elements);
}
/// EmitDeclare - Emit local variable declaration debug info.
void CGDebugInfo::EmitDeclare(const VarDecl *VD, unsigned Tag,
llvm::Value *Storage, CGBuilderTy &Builder) {
assert(!RegionStack.empty() && "Region stack mismatch, stack empty!");
llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
llvm::DIType Ty;
uint64_t XOffset = 0;
if (VD->hasAttr<BlocksAttr>())
Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
else
Ty = getOrCreateType(VD->getType(), Unit);
// If there is not any debug info for type then do not emit debug info
// for this variable.
if (!Ty)
return;
// Get location information.
unsigned Line = getLineNumber(VD->getLocation());
unsigned Column = getColumnNumber(VD->getLocation());
// Create the descriptor for the variable.
llvm::DIVariable D =
DebugFactory.CreateVariable(Tag, llvm::DIDescriptor(RegionStack.back()),
VD->getName(),
Unit, Line, Ty, CGM.getLangOptions().Optimize);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call =
DebugFactory.InsertDeclare(Storage, D, Builder.GetInsertBlock());
llvm::MDNode *Scope = RegionStack.back();
Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
}
/// EmitDeclare - Emit local variable declaration debug info.
void CGDebugInfo::EmitDeclare(const BlockDeclRefExpr *BDRE, unsigned Tag,
llvm::Value *Storage, CGBuilderTy &Builder,
CodeGenFunction *CGF) {
const ValueDecl *VD = BDRE->getDecl();
assert(!RegionStack.empty() && "Region stack mismatch, stack empty!");
if (Builder.GetInsertBlock() == 0)
return;
uint64_t XOffset = 0;
llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
llvm::DIType Ty;
if (VD->hasAttr<BlocksAttr>())
Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
else
Ty = getOrCreateType(VD->getType(), Unit);
// Get location information.
unsigned Line = getLineNumber(VD->getLocation());
unsigned Column = getColumnNumber(VD->getLocation());
CharUnits offset = CGF->BlockDecls[VD];
llvm::SmallVector<llvm::Value *, 9> addr;
const llvm::Type *Int64Ty = llvm::Type::getInt64Ty(CGM.getLLVMContext());
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIFactory::OpDeref));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIFactory::OpPlus));
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
if (BDRE->isByRef()) {
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIFactory::OpDeref));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIFactory::OpPlus));
// offset of __forwarding field
offset = CharUnits::fromQuantity(CGF->LLVMPointerWidth/8);
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIFactory::OpDeref));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIFactory::OpPlus));
// offset of x field
offset = CharUnits::fromQuantity(XOffset/8);
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
}
// Create the descriptor for the variable.
llvm::DIVariable D =
DebugFactory.CreateComplexVariable(Tag,
llvm::DIDescriptor(RegionStack.back()),
VD->getName(), Unit, Line, Ty,
addr);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call =
DebugFactory.InsertDeclare(Storage, D, Builder.GetInsertBlock());
llvm::MDNode *Scope = RegionStack.back();
Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
}
void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
llvm::Value *Storage,
CGBuilderTy &Builder) {
EmitDeclare(VD, llvm::dwarf::DW_TAG_auto_variable, Storage, Builder);
}
void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
const BlockDeclRefExpr *BDRE, llvm::Value *Storage, CGBuilderTy &Builder,
CodeGenFunction *CGF) {
EmitDeclare(BDRE, llvm::dwarf::DW_TAG_auto_variable, Storage, Builder, CGF);
}
/// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
/// variable declaration.
void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
CGBuilderTy &Builder) {
EmitDeclare(VD, llvm::dwarf::DW_TAG_arg_variable, AI, Builder);
}
/// EmitGlobalVariable - Emit information about a global variable.
void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
const VarDecl *D) {
// Create global variable debug descriptor.
llvm::DIFile Unit = getOrCreateFile(D->getLocation());
unsigned LineNo = getLineNumber(D->getLocation());
QualType T = D->getType();
if (T->isIncompleteArrayType()) {
// CodeGen turns int[] into int[1] so we'll do the same here.
llvm::APSInt ConstVal(32);
ConstVal = 1;
QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
T = CGM.getContext().getConstantArrayType(ET, ConstVal,
ArrayType::Normal, 0);
}
llvm::StringRef DeclName = D->getName();
llvm::StringRef LinkageName;
if (D->getDeclContext() && !isa<FunctionDecl>(D->getDeclContext()))
LinkageName = Var->getName();
llvm::DIDescriptor DContext =
getContextDescriptor(dyn_cast<Decl>(D->getDeclContext()), Unit);
DebugFactory.CreateGlobalVariable(DContext, DeclName, DeclName, LinkageName,
Unit, LineNo, getOrCreateType(T, Unit),
Var->hasInternalLinkage(),
true/*definition*/, Var);
}
/// EmitGlobalVariable - Emit information about an objective-c interface.
void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
ObjCInterfaceDecl *ID) {
// Create global variable debug descriptor.
llvm::DIFile Unit = getOrCreateFile(ID->getLocation());
unsigned LineNo = getLineNumber(ID->getLocation());
llvm::StringRef Name = ID->getName();
QualType T = CGM.getContext().getObjCInterfaceType(ID);
if (T->isIncompleteArrayType()) {
// CodeGen turns int[] into int[1] so we'll do the same here.
llvm::APSInt ConstVal(32);
ConstVal = 1;
QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
T = CGM.getContext().getConstantArrayType(ET, ConstVal,
ArrayType::Normal, 0);
}
DebugFactory.CreateGlobalVariable(Unit, Name, Name, Name, Unit, LineNo,
getOrCreateType(T, Unit),
Var->hasInternalLinkage(),
true/*definition*/, Var);
}
/// getOrCreateNamesSpace - Return namespace descriptor for the given
/// namespace decl.
llvm::DINameSpace
CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl,
llvm::DIDescriptor Unit) {
llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH>::iterator I =
NameSpaceCache.find(NSDecl);
if (I != NameSpaceCache.end())
return llvm::DINameSpace(cast<llvm::MDNode>(I->second));
unsigned LineNo = getLineNumber(NSDecl->getLocation());
llvm::DIDescriptor Context =
getContextDescriptor(dyn_cast<Decl>(NSDecl->getDeclContext()), Unit);
llvm::DINameSpace NS =
DebugFactory.CreateNameSpace(Context, NSDecl->getName(),
llvm::DIFile(Unit), LineNo);
NameSpaceCache[NSDecl] = llvm::WeakVH(NS);
return NS;
}
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