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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 "CGBlocks.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclFriend.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.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/Frontend/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/Support/FileSystem.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
using namespace clang;
using namespace clang::CodeGen;
CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
: CGM(CGM), DBuilder(CGM.getModule()),
BlockLiteralGenericSet(false) {
CreateCompileUnit();
}
CGDebugInfo::~CGDebugInfo() {
assert(LexicalBlockStack.empty() &&
"Region stack mismatch, stack not empty!");
}
void CGDebugInfo::setLocation(SourceLocation Loc) {
// If the new location isn't valid return.
if (!Loc.isValid()) return;
CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
// If we've changed files in the middle of a lexical scope go ahead
// and create a new lexical scope with file node if it's different
// from the one in the scope.
if (LexicalBlockStack.empty()) return;
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
PresumedLoc PPLoc = SM.getPresumedLoc(PrevLoc);
if (PCLoc.isInvalid() || PPLoc.isInvalid() ||
!strcmp(PPLoc.getFilename(), PCLoc.getFilename()))
return;
llvm::MDNode *LB = LexicalBlockStack.back();
llvm::DIScope Scope = llvm::DIScope(LB);
if (Scope.isLexicalBlockFile()) {
llvm::DILexicalBlockFile LBF = llvm::DILexicalBlockFile(LB);
llvm::DIDescriptor D
= DBuilder.createLexicalBlockFile(LBF.getScope(),
getOrCreateFile(CurLoc));
llvm::MDNode *N = D;
LexicalBlockStack.pop_back();
LexicalBlockStack.push_back(N);
} else if (Scope.isLexicalBlock()) {
llvm::DIDescriptor D
= DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc));
llvm::MDNode *N = D;
LexicalBlockStack.pop_back();
LexicalBlockStack.push_back(N);
}
}
/// getContextDescriptor - Get context info for the decl.
llvm::DIDescriptor CGDebugInfo::getContextDescriptor(const Decl *Context) {
if (!Context)
return TheCU;
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));
if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context)) {
if (!RDecl->isDependentType()) {
llvm::DIType Ty = getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
getOrCreateMainFile());
return llvm::DIDescriptor(Ty);
}
}
return TheCU;
}
/// 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.
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 StringRef(StrPtr, NS.length());
}
StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
llvm::SmallString<256> MethodName;
llvm::raw_svector_ostream OS(MethodName);
OS << (OMD->isInstanceMethod() ? '-' : '+') << '[';
const DeclContext *DC = OMD->getDeclContext();
if (const ObjCImplementationDecl *OID =
dyn_cast<const ObjCImplementationDecl>(DC)) {
OS << OID->getName();
} else if (const ObjCInterfaceDecl *OID =
dyn_cast<const ObjCInterfaceDecl>(DC)) {
OS << OID->getName();
} else if (const ObjCCategoryImplDecl *OCD =
dyn_cast<const ObjCCategoryImplDecl>(DC)){
OS << ((NamedDecl *)OCD)->getIdentifier()->getNameStart() << '(' <<
OCD->getIdentifier()->getNameStart() << ')';
}
OS << ' ' << OMD->getSelector().getAsString() << ']';
char *StrPtr = DebugInfoNames.Allocate<char>(OS.tell());
memcpy(StrPtr, MethodName.begin(), OS.tell());
return StringRef(StrPtr, OS.tell());
}
/// getSelectorName - Return selector name. This is used for debugging
/// info.
StringRef CGDebugInfo::getSelectorName(Selector S) {
const std::string &SName = S.getAsString();
char *StrPtr = DebugInfoNames.Allocate<char>(SName.size());
memcpy(StrPtr, SName.data(), SName.size());
return StringRef(StrPtr, SName.size());
}
/// getClassName - Get class name including template argument list.
StringRef
CGDebugInfo::getClassName(RecordDecl *RD) {
ClassTemplateSpecializationDecl *Spec
= dyn_cast<ClassTemplateSpecializationDecl>(RD);
if (!Spec)
return RD->getName();
const TemplateArgument *Args;
unsigned NumArgs;
std::string Buffer;
if (TypeSourceInfo *TAW = Spec->getTypeAsWritten()) {
const TemplateSpecializationType *TST =
cast<TemplateSpecializationType>(TAW->getType());
Args = TST->getArgs();
NumArgs = TST->getNumArgs();
} else {
const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
Args = TemplateArgs.data();
NumArgs = TemplateArgs.size();
}
Buffer = RD->getIdentifier()->getNameStart();
PrintingPolicy Policy(CGM.getLangOptions());
Buffer += TemplateSpecializationType::PrintTemplateArgumentList(Args,
NumArgs,
Policy);
// Copy this name on the side and use its reference.
char *StrPtr = DebugInfoNames.Allocate<char>(Buffer.length());
memcpy(StrPtr, Buffer.data(), Buffer.length());
return StringRef(StrPtr, Buffer.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 DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc);
if (PLoc.isInvalid() || StringRef(PLoc.getFilename()).empty())
// If the location is not valid then use main input file.
return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
// 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));
}
llvm::DIFile F = DBuilder.createFile(PLoc.getFilename(), getCurrentDirname());
DIFileCache[fname] = F;
return F;
}
/// getOrCreateMainFile - Get the file info for main compile unit.
llvm::DIFile CGDebugInfo::getOrCreateMainFile() {
return DBuilder.createFile(TheCU.getFilename(), TheCU.getDirectory());
}
/// getLineNumber - Get line number for the location. If location is invalid
/// then use current location.
unsigned CGDebugInfo::getLineNumber(SourceLocation Loc) {
assert((Loc.isValid() || CurLoc.isValid()) && "Invalid current location!");
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
return PLoc.isValid()? PLoc.getLine() : 0;
}
/// getColumnNumber - Get column number for the location. If location is
/// invalid then use current location.
unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc) {
assert((Loc.isValid() || CurLoc.isValid()) && "Invalid current location!");
SourceManager &SM = CGM.getContext().getSourceManager();
PresumedLoc PLoc = SM.getPresumedLoc(Loc.isValid() ? Loc : CurLoc);
return PLoc.isValid()? PLoc.getColumn() : 0;
}
StringRef CGDebugInfo::getCurrentDirname() {
if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
return CGM.getCodeGenOpts().DebugCompilationDir;
if (!CWDName.empty())
return CWDName;
llvm::SmallString<256> CWD;
llvm::sys::fs::current_path(CWD);
char *CompDirnamePtr = DebugInfoNames.Allocate<char>(CWD.size());
memcpy(CompDirnamePtr, CWD.data(), CWD.size());
return CWDName = StringRef(CompDirnamePtr, CWD.size());
}
/// 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>";
// 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();
if (MainFileDir != ".")
MainFileName = MainFileDir + "/" + MainFileName;
}
// Save filename string.
char *FilenamePtr = DebugInfoNames.Allocate<char>(MainFileName.length());
memcpy(FilenamePtr, MainFileName.c_str(), MainFileName.length());
StringRef Filename(FilenamePtr, MainFileName.length());
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;
}
std::string Producer = getClangFullVersion();
// 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.
DBuilder.createCompileUnit(
LangTag, Filename, getCurrentDirname(),
Producer,
LO.Optimize, CGM.getCodeGenOpts().DwarfDebugFlags, RuntimeVers);
// FIXME - Eliminate TheCU.
TheCU = llvm::DICompileUnit(DBuilder.getCU());
}
/// CreateType - Get the Basic type from the cache or create a new
/// one if necessary.
llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT) {
unsigned Encoding = 0;
const char *BTName = NULL;
switch (BT->getKind()) {
#define BUILTIN_TYPE(Id, SingletonId)
#define PLACEHOLDER_TYPE(Id, SingletonId) \
case BuiltinType::Id:
#include "clang/AST/BuiltinTypes.def"
case BuiltinType::Dependent:
llvm_unreachable("Unexpected builtin type");
case BuiltinType::NullPtr:
return DBuilder.
createNullPtrType(BT->getName(CGM.getContext().getLangOptions()));
case BuiltinType::Void:
return llvm::DIType();
case BuiltinType::ObjCClass:
return DBuilder.createStructType(TheCU, "objc_class",
getOrCreateMainFile(), 0, 0, 0,
llvm::DIDescriptor::FlagFwdDecl,
llvm::DIArray());
case BuiltinType::ObjCId: {
// typedef struct objc_class *Class;
// typedef struct objc_object {
// Class isa;
// } *id;
llvm::DIType OCTy =
DBuilder.createStructType(TheCU, "objc_class",
getOrCreateMainFile(), 0, 0, 0,
llvm::DIDescriptor::FlagFwdDecl,
llvm::DIArray());
unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
llvm::DIType ISATy = DBuilder.createPointerType(OCTy, Size);
SmallVector<llvm::Value *, 16> EltTys;
llvm::DIType FieldTy =
DBuilder.createMemberType(getOrCreateMainFile(), "isa",
getOrCreateMainFile(), 0, Size,
0, 0, 0, ISATy);
EltTys.push_back(FieldTy);
llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
return DBuilder.createStructType(TheCU, "objc_object",
getOrCreateMainFile(),
0, 0, 0, 0, Elements);
}
case BuiltinType::ObjCSel: {
return DBuilder.createStructType(TheCU, "objc_selector",
getOrCreateMainFile(), 0, 0, 0,
llvm::DIDescriptor::FlagFwdDecl,
llvm::DIArray());
}
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::Char16:
case BuiltinType::Char32: Encoding = llvm::dwarf::DW_ATE_UTF; break;
case BuiltinType::UShort:
case BuiltinType::UInt:
case BuiltinType::UInt128:
case BuiltinType::ULong:
case BuiltinType::WChar_U:
case BuiltinType::ULongLong: Encoding = llvm::dwarf::DW_ATE_unsigned; break;
case BuiltinType::Short:
case BuiltinType::Int:
case BuiltinType::Int128:
case BuiltinType::Long:
case BuiltinType::WChar_S:
case BuiltinType::LongLong: Encoding = llvm::dwarf::DW_ATE_signed; break;
case BuiltinType::Bool: Encoding = llvm::dwarf::DW_ATE_boolean; break;
case BuiltinType::Half:
case BuiltinType::Float:
case BuiltinType::LongDouble:
case BuiltinType::Double: Encoding = llvm::dwarf::DW_ATE_float; break;
}
switch (BT->getKind()) {
case BuiltinType::Long: BTName = "long int"; break;
case BuiltinType::LongLong: BTName = "long long int"; break;
case BuiltinType::ULong: BTName = "long unsigned int"; break;
case BuiltinType::ULongLong: BTName = "long long unsigned int"; break;
default:
BTName = BT->getName(CGM.getContext().getLangOptions());
break;
}
// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(BT);
uint64_t Align = CGM.getContext().getTypeAlign(BT);
llvm::DIType DbgTy =
DBuilder.createBasicType(BTName, Size, Align, Encoding);
return DbgTy;
}
llvm::DIType CGDebugInfo::CreateType(const ComplexType *Ty) {
// 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);
llvm::DIType DbgTy =
DBuilder.createBasicType("complex", Size, Align, 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();
Qc.removeObjCLifetime();
// 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(CGM.getContext(), T), Unit);
// No need to fill in the Name, Line, Size, Alignment, Offset in case of
// CVR derived types.
llvm::DIType DbgTy = DBuilder.createQualifiedType(Tag, 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);
}
/// CreatePointeeType - Create Pointee type. If Pointee is a record
/// then emit record's fwd if debug info size reduction is enabled.
llvm::DIType CGDebugInfo::CreatePointeeType(QualType PointeeTy,
llvm::DIFile Unit) {
if (!CGM.getCodeGenOpts().LimitDebugInfo)
return getOrCreateType(PointeeTy, Unit);
// Limit debug info for the pointee type.
// Handle qualifiers.
if (PointeeTy.hasLocalQualifiers())
return CreateQualifiedType(PointeeTy, Unit);
if (const RecordType *RTy = dyn_cast<RecordType>(PointeeTy)) {
RecordDecl *RD = RTy->getDecl();
llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
unsigned Line = getLineNumber(RD->getLocation());
llvm::DIDescriptor FDContext =
getContextDescriptor(cast<Decl>(RD->getDeclContext()));
if (RD->isStruct())
return DBuilder.createStructType(FDContext, RD->getName(), DefUnit,
Line, 0, 0, llvm::DIType::FlagFwdDecl,
llvm::DIArray());
else if (RD->isUnion())
return DBuilder.createUnionType(FDContext, RD->getName(), DefUnit,
Line, 0, 0, llvm::DIType::FlagFwdDecl,
llvm::DIArray());
else {
assert(RD->isClass() && "Unknown RecordType!");
return DBuilder.createClassType(FDContext, RD->getName(), DefUnit,
Line, 0, 0, 0, llvm::DIType::FlagFwdDecl,
llvm::DIType(), llvm::DIArray());
}
}
return getOrCreateType(PointeeTy, Unit);
}
llvm::DIType CGDebugInfo::CreatePointerLikeType(unsigned Tag,
const Type *Ty,
QualType PointeeTy,
llvm::DIFile Unit) {
if (Tag == llvm::dwarf::DW_TAG_reference_type)
return DBuilder.createReferenceType(CreatePointeeType(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.
unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
uint64_t Size = CGM.getContext().getTargetInfo().getPointerWidth(AS);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
return DBuilder.createPointerType(CreatePointeeType(PointeeTy, Unit),
Size, Align);
}
llvm::DIType CGDebugInfo::CreateType(const BlockPointerType *Ty,
llvm::DIFile Unit) {
if (BlockLiteralGenericSet)
return BlockLiteralGeneric;
SmallVector<llvm::Value *, 8> 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 = DBuilder.getOrCreateArray(EltTys);
EltTys.clear();
unsigned Flags = llvm::DIDescriptor::FlagAppleBlock;
unsigned LineNo = getLineNumber(CurLoc);
EltTy = DBuilder.createStructType(Unit, "__block_descriptor",
Unit, LineNo, FieldOffset, 0,
Flags, Elements);
// Bit size, align and offset of the type.
uint64_t Size = CGM.getContext().getTypeSize(Ty);
DescTy = DBuilder.createPointerType(EltTy, Size);
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 = DBuilder.createMemberType(Unit, "__descriptor", Unit,
LineNo, FieldSize, FieldAlign,
FieldOffset, 0, FieldTy);
EltTys.push_back(FieldTy);
FieldOffset += FieldSize;
Elements = DBuilder.getOrCreateArray(EltTys);
EltTy = DBuilder.createStructType(Unit, "__block_literal_generic",
Unit, LineNo, FieldOffset, 0,
Flags, Elements);
BlockLiteralGenericSet = true;
BlockLiteralGeneric = DBuilder.createPointerType(EltTy, Size);
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);
if (!Src.Verify())
return llvm::DIType();
// We don't set size information, but do specify where the typedef was
// declared.
unsigned Line = getLineNumber(Ty->getDecl()->getLocation());
const TypedefNameDecl *TyDecl = Ty->getDecl();
llvm::DIDescriptor TypedefContext =
getContextDescriptor(cast<Decl>(Ty->getDecl()->getDeclContext()));
return
DBuilder.createTypedef(Src, TyDecl->getName(), Unit, Line, TypedefContext);
}
llvm::DIType CGDebugInfo::CreateType(const FunctionType *Ty,
llvm::DIFile Unit) {
SmallVector<llvm::Value *, 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 (isa<FunctionNoProtoType>(Ty))
EltTys.push_back(DBuilder.createUnspecifiedParameter());
else 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));
}
llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(EltTys);
llvm::DIType DbgTy = DBuilder.createSubroutineType(Unit, EltTypeArray);
return DbgTy;
}
llvm::DIType CGDebugInfo::createFieldType(StringRef name,
QualType type,
uint64_t sizeInBitsOverride,
SourceLocation loc,
AccessSpecifier AS,
uint64_t offsetInBits,
llvm::DIFile tunit,
llvm::DIDescriptor scope) {
llvm::DIType debugType = getOrCreateType(type, tunit);
// Get the location for the field.
llvm::DIFile file = getOrCreateFile(loc);
unsigned line = getLineNumber(loc);
uint64_t sizeInBits = 0;
unsigned alignInBits = 0;
if (!type->isIncompleteArrayType()) {
llvm::tie(sizeInBits, alignInBits) = CGM.getContext().getTypeInfo(type);
if (sizeInBitsOverride)
sizeInBits = sizeInBitsOverride;
}
unsigned flags = 0;
if (AS == clang::AS_private)
flags |= llvm::DIDescriptor::FlagPrivate;
else if (AS == clang::AS_protected)
flags |= llvm::DIDescriptor::FlagProtected;
return DBuilder.createMemberType(scope, name, file, line, sizeInBits,
alignInBits, offsetInBits, flags, debugType);
}
/// 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 *record, llvm::DIFile tunit,
SmallVectorImpl<llvm::Value *> &elements,
llvm::DIType RecordTy) {
unsigned fieldNo = 0;
const FieldDecl *LastFD = 0;
bool IsMsStruct = record->hasAttr<MsStructAttr>();
const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
for (RecordDecl::field_iterator I = record->field_begin(),
E = record->field_end();
I != E; ++I, ++fieldNo) {
FieldDecl *field = *I;
if (IsMsStruct) {
// Zero-length bitfields following non-bitfield members are ignored
if (CGM.getContext().ZeroBitfieldFollowsNonBitfield((field), LastFD)) {
--fieldNo;
continue;
}
LastFD = field;
}
StringRef name = field->getName();
QualType type = field->getType();
// Ignore unnamed fields unless they're anonymous structs/unions.
if (name.empty() && !type->isRecordType()) {
LastFD = field;
continue;
}
uint64_t SizeInBitsOverride = 0;
if (field->isBitField()) {
SizeInBitsOverride = field->getBitWidthValue(CGM.getContext());
assert(SizeInBitsOverride && "found named 0-width bitfield");
}
llvm::DIType fieldType
= createFieldType(name, type, SizeInBitsOverride,
field->getLocation(), field->getAccess(),
layout.getFieldOffset(fieldNo), tunit, RecordTy);
elements.push_back(fieldType);
}
}
/// 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);
// Add "this" pointer.
llvm::DIArray Args = llvm::DICompositeType(FnTy).getTypeArray();
assert (Args.getNumElements() && "Invalid number of arguments!");
SmallVector<llvm::Value *, 16> Elts;
// First element is always return type. For 'void' functions it is NULL.
Elts.push_back(Args.getElement(0));
if (!Method->isStatic()) {
// "this" pointer is always first argument.
QualType ThisPtr = Method->getThisType(CGM.getContext());
const CXXRecordDecl *RD = Method->getParent();
if (isa<ClassTemplateSpecializationDecl>(RD)) {
// Create pointer type directly in this case.
const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
QualType PointeeTy = ThisPtrTy->getPointeeType();
unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
uint64_t Size = CGM.getContext().getTargetInfo().getPointerWidth(AS);
uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
llvm::DIType PointeeType = getOrCreateType(PointeeTy, Unit);
llvm::DIType ThisPtrType =
DBuilder.createArtificialType
(DBuilder.createPointerType(PointeeType, Size, Align));
TypeCache[ThisPtr.getAsOpaquePtr()] = ThisPtrType;
Elts.push_back(ThisPtrType);
} else {
llvm::DIType ThisPtrType =
DBuilder.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 = DBuilder.getOrCreateArray(Elts);
return DBuilder.createSubroutineType(Unit, EltTypeArray);
}
/// isFunctionLocalClass - Return true if CXXRecordDecl is defined
/// inside a function.
static bool isFunctionLocalClass(const CXXRecordDecl *RD) {
if (const CXXRecordDecl *NRD = dyn_cast<CXXRecordDecl>(RD->getDeclContext()))
return isFunctionLocalClass(NRD);
if (isa<FunctionDecl>(RD->getDeclContext()))
return true;
return false;
}
/// 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::DIType RecordTy) {
bool IsCtorOrDtor =
isa<CXXConstructorDecl>(Method) || isa<CXXDestructorDecl>(Method);
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.
StringRef MethodLinkageName;
if (!IsCtorOrDtor && !isFunctionLocalClass(Method->getParent()))
MethodLinkageName = CGM.getMangledName(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.getVTableContext().getMethodVTableIndex(Method);
ContainingType = RecordTy;
}
unsigned Flags = 0;
if (Method->isImplicit())
Flags |= llvm::DIDescriptor::FlagArtificial;
AccessSpecifier Access = Method->getAccess();
if (Access == clang::AS_private)
Flags |= llvm::DIDescriptor::FlagPrivate;
else if (Access == clang::AS_protected)
Flags |= llvm::DIDescriptor::FlagProtected;
if (const CXXConstructorDecl *CXXC = dyn_cast<CXXConstructorDecl>(Method)) {
if (CXXC->isExplicit())
Flags |= llvm::DIDescriptor::FlagExplicit;
} else if (const CXXConversionDecl *CXXC =
dyn_cast<CXXConversionDecl>(Method)) {
if (CXXC->isExplicit())
Flags |= llvm::DIDescriptor::FlagExplicit;
}
if (Method->hasPrototype())
Flags |= llvm::DIDescriptor::FlagPrototyped;
llvm::DISubprogram SP =
DBuilder.createMethod(RecordTy, MethodName, MethodLinkageName,
MethodDefUnit, MethodLine,
MethodTy, /*isLocalToUnit=*/false,
/* isDefinition=*/ false,
Virtuality, VIndex, ContainingType,
Flags, CGM.getLangOptions().Optimize);
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,
SmallVectorImpl<llvm::Value *> &EltTys,
llvm::DIType 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));
}
}
/// CollectCXXFriends - A helper function to collect debug info for
/// C++ base classes. This is used while creating debug info entry for
/// a Record.
void CGDebugInfo::
CollectCXXFriends(const CXXRecordDecl *RD, llvm::DIFile Unit,
SmallVectorImpl<llvm::Value *> &EltTys,
llvm::DIType RecordTy) {
for (CXXRecordDecl::friend_iterator BI = RD->friend_begin(),
BE = RD->friend_end(); BI != BE; ++BI) {
if ((*BI)->isUnsupportedFriend())
continue;
if (TypeSourceInfo *TInfo = (*BI)->getFriendType())
EltTys.push_back(DBuilder.createFriend(RecordTy,
getOrCreateType(TInfo->getType(),
Unit)));
}
}
/// 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,
SmallVectorImpl<llvm::Value *> &EltTys,
llvm::DIType 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.getVTableContext()
.getVirtualBaseOffsetOffset(RD, Base).getQuantity();
BFlags = llvm::DIDescriptor::FlagVirtual;
} else
BaseOffset = RL.getBaseClassOffsetInBits(Base);
// FIXME: Inconsistent units for BaseOffset. It is in bytes when
// BI->isVirtual() and bits when not.
AccessSpecifier Access = BI->getAccessSpecifier();
if (Access == clang::AS_private)
BFlags |= llvm::DIDescriptor::FlagPrivate;
else if (Access == clang::AS_protected)
BFlags |= llvm::DIDescriptor::FlagProtected;
llvm::DIType DTy =
DBuilder.createInheritance(RecordTy,
getOrCreateType(BI->getType(), Unit),
BaseOffset, BFlags);
EltTys.push_back(DTy);
}
}
/// CollectTemplateParams - A helper function to collect template parameters.
llvm::DIArray CGDebugInfo::
CollectTemplateParams(const TemplateParameterList *TPList,
const TemplateArgumentList &TAList,
llvm::DIFile Unit) {
SmallVector<llvm::Value *, 16> TemplateParams;
for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
const TemplateArgument &TA = TAList[i];
const NamedDecl *ND = TPList->getParam(i);
if (TA.getKind() == TemplateArgument::Type) {
llvm::DIType TTy = getOrCreateType(TA.getAsType(), Unit);
llvm::DITemplateTypeParameter TTP =
DBuilder.createTemplateTypeParameter(TheCU, ND->getName(), TTy);
TemplateParams.push_back(TTP);
} else if (TA.getKind() == TemplateArgument::Integral) {
llvm::DIType TTy = getOrCreateType(TA.getIntegralType(), Unit);
llvm::DITemplateValueParameter TVP =
DBuilder.createTemplateValueParameter(TheCU, ND->getName(), TTy,
TA.getAsIntegral()->getZExtValue());
TemplateParams.push_back(TVP);
}
}
return DBuilder.getOrCreateArray(TemplateParams);
}
/// CollectFunctionTemplateParams - A helper function to collect debug
/// info for function template parameters.
llvm::DIArray CGDebugInfo::
CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit) {
if (FD->getTemplatedKind() ==
FunctionDecl::TK_FunctionTemplateSpecialization) {
const TemplateParameterList *TList =
FD->getTemplateSpecializationInfo()->getTemplate()
->getTemplateParameters();
return
CollectTemplateParams(TList, *FD->getTemplateSpecializationArgs(), Unit);
}
return llvm::DIArray();
}
/// CollectCXXTemplateParams - A helper function to collect debug info for
/// template parameters.
llvm::DIArray CGDebugInfo::
CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TSpecial,
llvm::DIFile Unit) {
llvm::PointerUnion<ClassTemplateDecl *,
ClassTemplatePartialSpecializationDecl *>
PU = TSpecial->getSpecializedTemplateOrPartial();
TemplateParameterList *TPList = PU.is<ClassTemplateDecl *>() ?
PU.get<ClassTemplateDecl *>()->getTemplateParameters() :
PU.get<ClassTemplatePartialSpecializationDecl *>()->getTemplateParameters();
const TemplateArgumentList &TAList = TSpecial->getTemplateInstantiationArgs();
return CollectTemplateParams(TPList, TAList, Unit);
}
/// 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::Value *STy = getOrCreateType(Context.IntTy, Unit);
llvm::DIArray SElements = DBuilder.getOrCreateArray(STy);
llvm::DIType SubTy = DBuilder.createSubroutineType(Unit, SElements);
unsigned Size = Context.getTypeSize(Context.VoidPtrTy);
llvm::DIType vtbl_ptr_type = DBuilder.createPointerType(SubTy, Size, 0,
"__vtbl_ptr_type");
VTablePtrType = DBuilder.createPointerType(vtbl_ptr_type, Size);
return VTablePtrType;
}
/// getVTableName - Get vtable name for the given Class.
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 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,
SmallVectorImpl<llvm::Value *> &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
= DBuilder.createMemberType(Unit, getVTableName(RD), Unit,
0, Size, 0, 0, 0,
getOrCreateVTablePtrType(Unit));
EltTys.push_back(VPTR);
}
/// getOrCreateRecordType - Emit record type's standalone debug info.
llvm::DIType CGDebugInfo::getOrCreateRecordType(QualType RTy,
SourceLocation Loc) {
llvm::DIType T = getOrCreateType(RTy, getOrCreateFile(Loc));
DBuilder.retainType(T);
return T;
}
/// CreateType - get structure or union type.
llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();
llvm::DIFile Unit = getOrCreateFile(RD->getLocation());
// 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.
llvm::DIDescriptor FDContext =
getContextDescriptor(cast<Decl>(RD->getDeclContext()));
// If this is just a forward declaration, construct an appropriately
// marked node and just return it.
if (!RD->getDefinition()) {
llvm::DIType FwdDecl =
DBuilder.createStructType(FDContext, RD->getName(),
DefUnit, Line, 0, 0,
llvm::DIDescriptor::FlagFwdDecl,
llvm::DIArray());
return FwdDecl;
}
llvm::DIType FwdDecl = DBuilder.createTemporaryType(DefUnit);
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.
LexicalBlockStack.push_back(FwdDeclNode);
RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
// Convert all the elements.
SmallVector<llvm::Value *, 16> EltTys;
const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
if (CXXDecl) {
CollectCXXBases(CXXDecl, Unit, EltTys, FwdDecl);
CollectVTableInfo(CXXDecl, Unit, EltTys);
}
// Collect static variables with initializers.
for (RecordDecl::decl_iterator I = RD->decls_begin(), E = RD->decls_end();
I != E; ++I)
if (const VarDecl *V = dyn_cast<VarDecl>(*I)) {
if (const Expr *Init = V->getInit()) {
Expr::EvalResult Result;
if (Init->EvaluateAsRValue(Result, CGM.getContext()) &&
Result.Val.isInt()) {
llvm::ConstantInt *CI
= llvm::ConstantInt::get(CGM.getLLVMContext(), Result.Val.getInt());
// Create the descriptor for static variable.
llvm::DIFile VUnit = getOrCreateFile(V->getLocation());
StringRef VName = V->getName();
llvm::DIType VTy = getOrCreateType(V->getType(), VUnit);
// Do not use DIGlobalVariable for enums.
if (VTy.getTag() != llvm::dwarf::DW_TAG_enumeration_type) {
DBuilder.createStaticVariable(FwdDecl, VName, VName, VUnit,
getLineNumber(V->getLocation()),
VTy, true, CI);
}
}
}
}
CollectRecordFields(RD, Unit, EltTys, FwdDecl);
llvm::DIArray TParamsArray;
if (CXXDecl) {
CollectCXXMemberFunctions(CXXDecl, Unit, EltTys, FwdDecl);
CollectCXXFriends(CXXDecl, Unit, EltTys, FwdDecl);
if (const ClassTemplateSpecializationDecl *TSpecial
= dyn_cast<ClassTemplateSpecializationDecl>(RD))
TParamsArray = CollectCXXTemplateParams(TSpecial, Unit);
}
LexicalBlockStack.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(cast<Decl>(RD->getDeclContext()));
StringRef RDName = RD->getName();
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
llvm::MDNode *RealDecl = NULL;
if (RD->isUnion())
RealDecl = DBuilder.createUnionType(RDContext, RDName, DefUnit, Line,
Size, Align, 0, Elements);
else if (CXXDecl) {
RDName = getClassName(RD);
// A class's primary base or the class itself contains the vtable.
llvm::MDNode *ContainingType = NULL;
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
if (const CXXRecordDecl *PBase = RL.getPrimaryBase()) {
// Seek non virtual primary base root.
while (1) {
const ASTRecordLayout &BRL = CGM.getContext().getASTRecordLayout(PBase);
const CXXRecordDecl *PBT = BRL.getPrimaryBase();
if (PBT && !BRL.isPrimaryBaseVirtual())
PBase = PBT;
else
break;
}
ContainingType =
getOrCreateType(QualType(PBase->getTypeForDecl(), 0), Unit);
}
else if (CXXDecl->isDynamicClass())
ContainingType = FwdDecl;
RealDecl = DBuilder.createClassType(RDContext, RDName, DefUnit, Line,
Size, Align, 0, 0, llvm::DIType(),
Elements, ContainingType,
TParamsArray);
} else
RealDecl = DBuilder.createStructType(RDContext, RDName, DefUnit, Line,
Size, Align, 0, Elements);
// 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::DIType(FwdDeclNode).replaceAllUsesWith(RealDecl);
RegionMap[RD] = llvm::WeakVH(RealDecl);
return llvm::DIType(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();
if (!ID)
return llvm::DIType();
// 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();
// If this is just a forward declaration return a special forward-declaration
// debug type since we won't be able to lay out the entire type.
if (ID->isForwardDecl()) {
llvm::DIType FwdDecl =
DBuilder.createStructType(Unit, ID->getName(),
DefUnit, Line, 0, 0, 0,
llvm::DIArray(), RuntimeLang);
return FwdDecl;
}
// To handle a 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::DIType FwdDecl = DBuilder.createTemporaryType(DefUnit);
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.
LexicalBlockStack.push_back(FwdDeclNode);
RegionMap[Ty->getDecl()] = llvm::WeakVH(FwdDecl);
// Convert all the elements.
SmallVector<llvm::Value *, 16> EltTys;
ObjCInterfaceDecl *SClass = ID->getSuperClass();
if (SClass) {
llvm::DIType SClassTy =
getOrCreateType(CGM.getContext().getObjCInterfaceType(SClass), Unit);
if (!SClassTy.isValid())
return llvm::DIType();
llvm::DIType InhTag =
DBuilder.createInheritance(FwdDecl, SClassTy, 0, 0);
EltTys.push_back(InhTag);
}
const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
ObjCImplementationDecl *ImpD = ID->getImplementation();
unsigned FieldNo = 0;
for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
Field = Field->getNextIvar(), ++FieldNo) {
llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
if (!FieldTy.isValid())
return llvm::DIType();
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 = Field->isBitField()
? Field->getBitWidthValue(CGM.getContext())
: CGM.getContext().getTypeSize(FType);
FieldAlign = CGM.getContext().getTypeAlign(FType);
}
// We can't know the offset of our ivar in the structure if we're using
// the non-fragile abi and the debugger should ignore the value anyways.
// Call it the FieldNo+1 due to how debuggers use the information,
// e.g. negating the value when it needs a lookup in the dynamic table.
uint64_t FieldOffset = CGM.getLangOptions().ObjCNonFragileABI ? FieldNo+1
: RL.getFieldOffset(FieldNo);
unsigned Flags = 0;
if (Field->getAccessControl() == ObjCIvarDecl::Protected)
Flags = llvm::DIDescriptor::FlagProtected;
else if (Field->getAccessControl() == ObjCIvarDecl::Private)
Flags = llvm::DIDescriptor::FlagPrivate;
StringRef PropertyName;
StringRef PropertyGetter;
StringRef PropertySetter;
unsigned PropertyAttributes = 0;
ObjCPropertyDecl *PD = NULL;
if (ImpD)
if (ObjCPropertyImplDecl *PImpD =
ImpD->FindPropertyImplIvarDecl(Field->getIdentifier()))
PD = PImpD->getPropertyDecl();
if (PD) {
PropertyName = PD->getName();
PropertyGetter = getSelectorName(PD->getGetterName());
PropertySetter = getSelectorName(PD->getSetterName());
PropertyAttributes = PD->getPropertyAttributes();
}
FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit,
FieldLine, FieldSize, FieldAlign,
FieldOffset, Flags, FieldTy,
PropertyName, PropertyGetter,
PropertySetter, PropertyAttributes);
EltTys.push_back(FieldTy);
}
llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
LexicalBlockStack.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);
unsigned Flags = 0;
if (ID->getImplementation())
Flags |= llvm::DIDescriptor::FlagObjcClassComplete;
llvm::DIType RealDecl =
DBuilder.createStructType(Unit, ID->getName(), DefUnit,
Line, Size, Align, Flags,
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::DIType(FwdDeclNode).replaceAllUsesWith(RealDecl);
RegionMap[ID] = llvm::WeakVH(RealDecl);
return RealDecl;
}
llvm::DIType CGDebugInfo::CreateType(const VectorType *Ty, llvm::DIFile Unit) {
llvm::DIType ElementTy = getOrCreateType(Ty->getElementType(), Unit);
int64_t NumElems = Ty->getNumElements();
int64_t LowerBound = 0;
if (NumElems == 0)
// If number of elements are not known then this is an unbounded array.
// Use Low = 1, Hi = 0 to express such arrays.
LowerBound = 1;
else
--NumElems;
llvm::Value *Subscript = DBuilder.getOrCreateSubrange(LowerBound, NumElems);
llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
return
DBuilder.createVectorType(Size, Align, 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 if (Ty->isDependentSizedArrayType() || Ty->isIncompleteType()) {
Size = 0;
Align = 0;
} 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?
SmallVector<llvm::Value *, 8> Subscripts;
QualType EltTy(Ty, 0);
if (Ty->isIncompleteArrayType())
EltTy = Ty->getElementType();
else {
while ((Ty = dyn_cast<ArrayType>(EltTy))) {
int64_t UpperBound = 0;
int64_t LowerBound = 0;
if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty)) {
if (CAT->getSize().getZExtValue())
UpperBound = CAT->getSize().getZExtValue() - 1;
} else
// This is an unbounded array. Use Low = 1, Hi = 0 to express such
// arrays.
LowerBound = 1;
// FIXME: Verify this is right for VLAs.
Subscripts.push_back(DBuilder.getOrCreateSubrange(LowerBound,
UpperBound));
EltTy = Ty->getElementType();
}
}
llvm::DIArray SubscriptArray = DBuilder.getOrCreateArray(Subscripts);
llvm::DIType DbgTy =
DBuilder.createArrayType(Size, Align, 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 RValueReferenceType *Ty,
llvm::DIFile Unit) {
return CreatePointerLikeType(llvm::dwarf::DW_TAG_rvalue_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::Value *ElementTypes[2];
// FIXME: This should probably be a function type instead.
ElementTypes[0] =
DBuilder.createMemberType(U, "ptr", U, 0,
Info.first, Info.second, FieldOffset, 0,
PointerDiffDITy);
FieldOffset += Info.first;
ElementTypes[1] =
DBuilder.createMemberType(U, "ptr", U, 0,
Info.first, Info.second, FieldOffset, 0,
PointerDiffDITy);
llvm::DIArray Elements = DBuilder.getOrCreateArray(ElementTypes);
return DBuilder.createStructType(U, StringRef("test"),
U, 0, FieldOffset,
0, 0, Elements);
}
llvm::DIType CGDebugInfo::CreateType(const AtomicType *Ty,
llvm::DIFile U) {
// Ignore the atomic wrapping
// FIXME: What is the correct representation?
return getOrCreateType(Ty->getValueType(), U);
}
/// CreateEnumType - get enumeration type.
llvm::DIType CGDebugInfo::CreateEnumType(const EnumDecl *ED) {
llvm::DIFile Unit = getOrCreateFile(ED->getLocation());
SmallVector<llvm::Value *, 16> 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(
DBuilder.createEnumerator(Enum->getName(),
Enum->getInitVal().getZExtValue()));
}
// Return a CompositeType for the enum itself.
llvm::DIArray EltArray = DBuilder.getOrCreateArray(Enumerators);
llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
unsigned Line = getLineNumber(ED->getLocation());
uint64_t Size = 0;
uint64_t Align = 0;
if (!ED->getTypeForDecl()->isIncompleteType()) {
Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
}
llvm::DIDescriptor EnumContext =
getContextDescriptor(cast<Decl>(ED->getDeclContext()));
llvm::DIType DbgTy =
DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit, Line,
Size, Align, EltArray);
return DbgTy;
}
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:
T = cast<TypeOfExprType>(T)->getUnderlyingExpr()->getType();
break;
case Type::TypeOf:
T = cast<TypeOfType>(T)->getUnderlyingType();
break;
case Type::Decltype:
T = cast<DecltypeType>(T)->getUnderlyingType();
break;
case Type::UnaryTransform:
T = cast<UnaryTransformType>(T)->getUnderlyingType();
break;
case Type::Attributed:
T = cast<AttributedType>(T)->getEquivalentType();
break;
case Type::Elaborated:
T = cast<ElaboratedType>(T)->getNamedType();
break;
case Type::Paren:
T = cast<ParenType>(T)->getInnerType();
break;
case Type::SubstTemplateTypeParm:
T = cast<SubstTemplateTypeParmType>(T)->getReplacementType();
break;
case Type::Auto:
T = cast<AutoType>(T)->getDeducedType();
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"
llvm_unreachable("Dependent types cannot show up in debug information");
case Type::ExtVector:
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));
case Type::Complex:
return CreateType(cast<ComplexType>(Ty));
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:
return CreateType(cast<RecordType>(Ty));
case Type::Enum:
return CreateEnumType(cast<EnumType>(Ty)->getDecl());
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::RValueReference:
return CreateType(cast<RValueReferenceType>(Ty), Unit);
case Type::MemberPointer:
return CreateType(cast<MemberPointerType>(Ty), Unit);
case Type::Atomic:
return CreateType(cast<AtomicType>(Ty), Unit);
case Type::Attributed:
case Type::TemplateSpecialization:
case Type::Elaborated:
case Type::Paren:
case Type::SubstTemplateTypeParm:
case Type::TypeOfExpr:
case Type::TypeOf:
case Type::Decltype:
case Type::UnaryTransform:
case Type::Auto:
llvm_unreachable("type should have been unwrapped!");
return llvm::DIType();
}
assert(Diag && "Fall through without a diagnostic?");
unsigned DiagID = CGM.getDiags().getCustomDiagID(DiagnosticsEngine::Error,
"debug information for %0 is not yet supported");
CGM.getDiags().Report(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,
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 = DBuilder.createMemberType(Unit, Name, Unit, 0,
FieldSize, FieldAlign,
*Offset, 0, FieldTy);
*Offset += FieldSize;
return Ty;
}
/// getFunctionDeclaration - Return debug info descriptor to describe method
/// declaration for the given method definition.
llvm::DISubprogram CGDebugInfo::getFunctionDeclaration(const Decl *D) {
const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
if (!FD) return llvm::DISubprogram();
// Setup context.
getContextDescriptor(cast<Decl>(D->getDeclContext()));
llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
MI = SPCache.find(FD);
if (MI != SPCache.end()) {
llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(&*MI->second));
if (SP.isSubprogram() && !llvm::DISubprogram(SP).isDefinition())
return SP;
}
for (FunctionDecl::redecl_iterator I = FD->redecls_begin(),
E = FD->redecls_end(); I != E; ++I) {
const FunctionDecl *NextFD = *I;
llvm::DenseMap<const FunctionDecl *, llvm::WeakVH>::iterator
MI = SPCache.find(NextFD);
if (MI != SPCache.end()) {
llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(&*MI->second));
if (SP.isSubprogram() && !llvm::DISubprogram(SP).isDefinition())
return SP;
}
}
return llvm::DISubprogram();
}
// getOrCreateFunctionType - Construct DIType. If it is a c++ method, include
// implicit parameter "this".
llvm::DIType CGDebugInfo::getOrCreateFunctionType(const Decl * D,
QualType FnType,
llvm::DIFile F) {
if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
return getOrCreateMethodType(Method, F);
if (const ObjCMethodDecl *OMethod = dyn_cast<ObjCMethodDecl>(D)) {
// Add "self" and "_cmd"
SmallVector<llvm::Value *, 16> Elts;
// First element is always return type. For 'void' functions it is NULL.
Elts.push_back(getOrCreateType(OMethod->getResultType(), F));
// "self" pointer is always first argument.
Elts.push_back(getOrCreateType(OMethod->getSelfDecl()->getType(), F));
// "cmd" pointer is always second argument.
Elts.push_back(getOrCreateType(OMethod->getCmdDecl()->getType(), F));
// Get rest of the arguments.
for (ObjCMethodDecl::param_const_iterator PI = OMethod->param_begin(),
PE = OMethod->param_end(); PI != PE; ++PI)
Elts.push_back(getOrCreateType((*PI)->getType(), F));
llvm::DIArray EltTypeArray = DBuilder.getOrCreateArray(Elts);
return DBuilder.createSubroutineType(F, EltTypeArray);
}
return getOrCreateType(FnType, F);
}
/// 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) {
StringRef Name;
StringRef LinkageName;
FnBeginRegionCount.push_back(LexicalBlockStack.size());
const Decl *D = GD.getDecl();
unsigned Flags = 0;
llvm::DIFile Unit = getOrCreateFile(CurLoc);
llvm::DIDescriptor FDContext(Unit);
llvm::DIArray TParamsArray;
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;
LexicalBlockStack.push_back(SPN);
RegionMap[D] = llvm::WeakVH(SP);
return;
}
}
Name = getFunctionName(FD);
// Use mangled name as linkage name for c/c++ functions.
if (!Fn->hasInternalLinkage())
LinkageName = CGM.getMangledName(GD);
if (LinkageName == Name)
LinkageName = StringRef();
if (FD->hasPrototype())
Flags |= llvm::DIDescriptor::FlagPrototyped;
if (const NamespaceDecl *NSDecl =
dyn_cast_or_null<NamespaceDecl>(FD->getDeclContext()))
FDContext = getOrCreateNameSpace(NSDecl);
else if (const RecordDecl *RDecl =
dyn_cast_or_null<RecordDecl>(FD->getDeclContext()))
FDContext = getContextDescriptor(cast<Decl>(RDecl->getDeclContext()));
// Collect template parameters.
TParamsArray = CollectFunctionTemplateParams(FD, Unit);
} else if (const ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(D)) {
Name = getObjCMethodName(OMD);
Flags |= llvm::DIDescriptor::FlagPrototyped;
} else {
// Use llvm function name.
Name = Fn->getName();
Flags |= llvm::DIDescriptor::FlagPrototyped;
}
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.
unsigned LineNo = getLineNumber(CurLoc);
if (D->isImplicit())
Flags |= llvm::DIDescriptor::FlagArtificial;
llvm::DISubprogram SPDecl = getFunctionDeclaration(D);
llvm::DISubprogram SP =
DBuilder.createFunction(FDContext, Name, LinkageName, Unit,
LineNo, getOrCreateFunctionType(D, FnType, Unit),
Fn->hasInternalLinkage(), true/*definition*/,
Flags, CGM.getLangOptions().Optimize, Fn,
TParamsArray, SPDecl);
// Push function on region stack.
llvm::MDNode *SPN = SP;
LexicalBlockStack.push_back(SPN);
RegionMap[D] = llvm::WeakVH(SP);
}
/// EmitLocation - Emit metadata to indicate a change in line/column
/// information in the source file.
void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
// Update our current location
setLocation(Loc);
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.getExpansionLoc(CurLoc) == SM.getExpansionLoc(PrevLoc))
// New Builder may not be in sync with CGDebugInfo.
if (!Builder.getCurrentDebugLocation().isUnknown())
return;
// Update last state.
PrevLoc = CurLoc;
llvm::MDNode *Scope = LexicalBlockStack.back();
Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(getLineNumber(CurLoc),
getColumnNumber(CurLoc),
Scope));
}
/// CreateLexicalBlock - Creates a new lexical block node and pushes it on
/// the stack.
void CGDebugInfo::CreateLexicalBlock(SourceLocation Loc) {
llvm::DIDescriptor D =
DBuilder.createLexicalBlock(LexicalBlockStack.empty() ?
llvm::DIDescriptor() :
llvm::DIDescriptor(LexicalBlockStack.back()),
getOrCreateFile(CurLoc),
getLineNumber(CurLoc),
getColumnNumber(CurLoc));
llvm::MDNode *DN = D;
LexicalBlockStack.push_back(DN);
}
/// EmitLexicalBlockStart - Constructs the debug code for entering a declarative
/// region - beginning of a DW_TAG_lexical_block.
void CGDebugInfo::EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc) {
// Set our current location.
setLocation(Loc);
// Create a new lexical block and push it on the stack.
CreateLexicalBlock(Loc);
// Emit a line table change for the current location inside the new scope.
Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(getLineNumber(Loc),
getColumnNumber(Loc),
LexicalBlockStack.back()));
}
/// EmitLexicalBlockEnd - Constructs the debug code for exiting a declarative
/// region - end of a DW_TAG_lexical_block.
void CGDebugInfo::EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc) {
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
// Provide an entry in the line table for the end of the block.
EmitLocation(Builder, Loc);
LexicalBlockStack.pop_back();
}
/// EmitFunctionEnd - Constructs the debug code for exiting a function.
void CGDebugInfo::EmitFunctionEnd(CGBuilderTy &Builder) {
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
unsigned RCount = FnBeginRegionCount.back();
assert(RCount <= LexicalBlockStack.size() && "Region stack mismatch");
// Pop all regions for this function.
while (LexicalBlockStack.size() != RCount)
EmitLexicalBlockEnd(Builder, CurLoc);
FnBeginRegionCount.pop_back();
}
// EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
// See BuildByRefType.
llvm::DIType CGDebugInfo::EmitTypeForVarWithBlocksAttr(const ValueDecl *VD,
uint64_t *XOffset) {
SmallVector<llvm::Value *, 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.getContext().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 > CGM.getContext().toCharUnitsFromBits(
CGM.getContext().getTargetInfo().getPointerAlign(0))) {
CharUnits FieldOffsetInBytes
= CGM.getContext().toCharUnitsFromBits(FieldOffset);
CharUnits AlignedOffsetInBytes
= FieldOffsetInBytes.RoundUpToAlignment(Align);
CharUnits NumPaddingBytes
= AlignedOffsetInBytes - FieldOffsetInBytes;
if (NumPaddingBytes.isPositive()) {
llvm::APInt pad(32, NumPaddingBytes.getQuantity());
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 = CGM.getContext().toBits(Align);
*XOffset = FieldOffset;
FieldTy = DBuilder.createMemberType(Unit, VD->getName(), Unit,
0, FieldSize, FieldAlign,
FieldOffset, 0, FieldTy);
EltTys.push_back(FieldTy);
FieldOffset += FieldSize;
llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
unsigned Flags = llvm::DIDescriptor::FlagBlockByrefStruct;
return DBuilder.createStructType(Unit, "", Unit, 0, FieldOffset, 0, Flags,
Elements);
}
/// EmitDeclare - Emit local variable declaration debug info.
void CGDebugInfo::EmitDeclare(const VarDecl *VD, unsigned Tag,
llvm::Value *Storage,
unsigned ArgNo, CGBuilderTy &Builder) {
assert(!LexicalBlockStack.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;
if (llvm::Argument *Arg = dyn_cast<llvm::Argument>(Storage)) {
// If Storage is an aggregate returned as 'sret' then let debugger know
// about this.
if (Arg->hasStructRetAttr())
Ty = DBuilder.createReferenceType(Ty);
else if (CXXRecordDecl *Record = VD->getType()->getAsCXXRecordDecl()) {
// If an aggregate variable has non trivial destructor or non trivial copy
// constructor than it is pass indirectly. Let debug info know about this
// by using reference of the aggregate type as a argument type.
if (!Record->hasTrivialCopyConstructor() ||
!Record->hasTrivialDestructor())
Ty = DBuilder.createReferenceType(Ty);
}
}
// Get location information.
unsigned Line = getLineNumber(VD->getLocation());
unsigned Column = getColumnNumber(VD->getLocation());
unsigned Flags = 0;
if (VD->isImplicit())
Flags |= llvm::DIDescriptor::FlagArtificial;
llvm::MDNode *Scope = LexicalBlockStack.back();
StringRef Name = VD->getName();
if (!Name.empty()) {
if (VD->hasAttr<BlocksAttr>()) {
CharUnits offset = CharUnits::fromQuantity(32);
SmallVector<llvm::Value *, 9> addr;
llvm::Type *Int64Ty = llvm::Type::getInt64Ty(CGM.getLLVMContext());
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
// offset of __forwarding field
offset = CGM.getContext().toCharUnitsFromBits(
CGM.getContext().getTargetInfo().getPointerWidth(0));
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
// offset of x field
offset = CGM.getContext().toCharUnitsFromBits(XOffset);
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
// Create the descriptor for the variable.
llvm::DIVariable D =
DBuilder.createComplexVariable(Tag,
llvm::DIDescriptor(Scope),
VD->getName(), Unit, Line, Ty,
addr, ArgNo);
// Insert an llvm.dbg.declare into the current block.
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call =
DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
return;
}
// Create the descriptor for the variable.
llvm::DIVariable D =
DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
Name, Unit, Line, Ty,
CGM.getLangOptions().Optimize, Flags, ArgNo);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call =
DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
return;
}
// If VD is an anonymous union then Storage represents value for
// all union fields.
if (const RecordType *RT = dyn_cast<RecordType>(VD->getType())) {
const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
if (RD->isUnion()) {
for (RecordDecl::field_iterator I = RD->field_begin(),
E = RD->field_end();
I != E; ++I) {
FieldDecl *Field = *I;
llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
StringRef FieldName = Field->getName();
// Ignore unnamed fields. Do not ignore unnamed records.
if (FieldName.empty() && !isa<RecordType>(Field->getType()))
continue;
// Use VarDecl's Tag, Scope and Line number.
llvm::DIVariable D =
DBuilder.createLocalVariable(Tag, llvm::DIDescriptor(Scope),
FieldName, Unit, Line, FieldTy,
CGM.getLangOptions().Optimize, Flags,
ArgNo);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call =
DBuilder.insertDeclare(Storage, D, Builder.GetInsertBlock());
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, 0, Builder);
}
void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
const CGBlockInfo &blockInfo) {
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
if (Builder.GetInsertBlock() == 0)
return;
bool isByRef = VD->hasAttr<BlocksAttr>();
uint64_t XOffset = 0;
llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
llvm::DIType Ty;
if (isByRef)
Ty = EmitTypeForVarWithBlocksAttr(VD, &XOffset);
else
Ty = getOrCreateType(VD->getType(), Unit);
// Get location information.
unsigned Line = getLineNumber(VD->getLocation());
unsigned Column = getColumnNumber(VD->getLocation());
const llvm::TargetData &target = CGM.getTargetData();
CharUnits offset = CharUnits::fromQuantity(
target.getStructLayout(blockInfo.StructureType)
->getElementOffset(blockInfo.getCapture(VD).getIndex()));
SmallVector<llvm::Value *, 9> addr;
llvm::Type *Int64Ty = llvm::Type::getInt64Ty(CGM.getLLVMContext());
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
if (isByRef) {
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
// offset of __forwarding field
offset = CGM.getContext()
.toCharUnitsFromBits(target.getPointerSizeInBits());
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpDeref));
addr.push_back(llvm::ConstantInt::get(Int64Ty, llvm::DIBuilder::OpPlus));
// offset of x field
offset = CGM.getContext().toCharUnitsFromBits(XOffset);
addr.push_back(llvm::ConstantInt::get(Int64Ty, offset.getQuantity()));
}
// Create the descriptor for the variable.
llvm::DIVariable D =
DBuilder.createComplexVariable(llvm::dwarf::DW_TAG_auto_variable,
llvm::DIDescriptor(LexicalBlockStack.back()),
VD->getName(), Unit, Line, Ty, addr);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call =
DBuilder.insertDeclare(Storage, D, Builder.GetInsertPoint());
Call->setDebugLoc(llvm::DebugLoc::get(Line, Column,
LexicalBlockStack.back()));
}
/// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
/// variable declaration.
void CGDebugInfo::EmitDeclareOfArgVariable(const VarDecl *VD, llvm::Value *AI,
unsigned ArgNo,
CGBuilderTy &Builder) {
EmitDeclare(VD, llvm::dwarf::DW_TAG_arg_variable, AI, ArgNo, Builder);
}
namespace {
struct BlockLayoutChunk {
uint64_t OffsetInBits;
const BlockDecl::Capture *Capture;
};
bool operator<(const BlockLayoutChunk &l, const BlockLayoutChunk &r) {
return l.OffsetInBits < r.OffsetInBits;
}
}
void CGDebugInfo::EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
llvm::Value *addr,
CGBuilderTy &Builder) {
ASTContext &C = CGM.getContext();
const BlockDecl *blockDecl = block.getBlockDecl();
// Collect some general information about the block's location.
SourceLocation loc = blockDecl->getCaretLocation();
llvm::DIFile tunit = getOrCreateFile(loc);
unsigned line = getLineNumber(loc);
unsigned column = getColumnNumber(loc);
// Build the debug-info type for the block literal.
getContextDescriptor(cast<Decl>(blockDecl->getDeclContext()));
const llvm::StructLayout *blockLayout =
CGM.getTargetData().getStructLayout(block.StructureType);
SmallVector<llvm::Value*, 16> fields;
fields.push_back(createFieldType("__isa", C.VoidPtrTy, 0, loc, AS_public,
blockLayout->getElementOffsetInBits(0),
tunit, tunit));
fields.push_back(createFieldType("__flags", C.IntTy, 0, loc, AS_public,
blockLayout->getElementOffsetInBits(1),
tunit, tunit));
fields.push_back(createFieldType("__reserved", C.IntTy, 0, loc, AS_public,
blockLayout->getElementOffsetInBits(2),
tunit, tunit));
fields.push_back(createFieldType("__FuncPtr", C.VoidPtrTy, 0, loc, AS_public,
blockLayout->getElementOffsetInBits(3),
tunit, tunit));
fields.push_back(createFieldType("__descriptor",
C.getPointerType(block.NeedsCopyDispose ?
C.getBlockDescriptorExtendedType() :
C.getBlockDescriptorType()),
0, loc, AS_public,
blockLayout->getElementOffsetInBits(4),
tunit, tunit));
// We want to sort the captures by offset, not because DWARF
// requires this, but because we're paranoid about debuggers.
SmallVector<BlockLayoutChunk, 8> chunks;
// 'this' capture.
if (blockDecl->capturesCXXThis()) {
BlockLayoutChunk chunk;
chunk.OffsetInBits =
blockLayout->getElementOffsetInBits(block.CXXThisIndex);
chunk.Capture = 0;
chunks.push_back(chunk);
}
// Variable captures.
for (BlockDecl::capture_const_iterator
i = blockDecl->capture_begin(), e = blockDecl->capture_end();
i != e; ++i) {
const BlockDecl::Capture &capture = *i;
const VarDecl *variable = capture.getVariable();
const CGBlockInfo::Capture &captureInfo = block.getCapture(variable);
// Ignore constant captures.
if (captureInfo.isConstant())
continue;
BlockLayoutChunk chunk;
chunk.OffsetInBits =
blockLayout->getElementOffsetInBits(captureInfo.getIndex());
chunk.Capture = &capture;
chunks.push_back(chunk);
}
// Sort by offset.
llvm::array_pod_sort(chunks.begin(), chunks.end());
for (SmallVectorImpl<BlockLayoutChunk>::iterator
i = chunks.begin(), e = chunks.end(); i != e; ++i) {
uint64_t offsetInBits = i->OffsetInBits;
const BlockDecl::Capture *capture = i->Capture;
// If we have a null capture, this must be the C++ 'this' capture.
if (!capture) {
const CXXMethodDecl *method =
cast<CXXMethodDecl>(blockDecl->getNonClosureContext());
QualType type = method->getThisType(C);
fields.push_back(createFieldType("this", type, 0, loc, AS_public,
offsetInBits, tunit, tunit));
continue;
}
const VarDecl *variable = capture->getVariable();
StringRef name = variable->getName();
llvm::DIType fieldType;
if (capture->isByRef()) {
std::pair<uint64_t,unsigned> ptrInfo = C.getTypeInfo(C.VoidPtrTy);
// FIXME: this creates a second copy of this type!
uint64_t xoffset;
fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
fieldType = DBuilder.createPointerType(fieldType, ptrInfo.first);
fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
ptrInfo.first, ptrInfo.second,
offsetInBits, 0, fieldType);
} else {
fieldType = createFieldType(name, variable->getType(), 0,
loc, AS_public, offsetInBits, tunit, tunit);
}
fields.push_back(fieldType);
}
llvm::SmallString<36> typeName;
llvm::raw_svector_ostream(typeName)
<< "__block_literal_" << CGM.getUniqueBlockCount();
llvm::DIArray fieldsArray = DBuilder.getOrCreateArray(fields);
llvm::DIType type =
DBuilder.createStructType(tunit, typeName.str(), tunit, line,
CGM.getContext().toBits(block.BlockSize),
CGM.getContext().toBits(block.BlockAlign),
0, fieldsArray);
type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
// Get overall information about the block.
unsigned flags = llvm::DIDescriptor::FlagArtificial;
llvm::MDNode *scope = LexicalBlockStack.back();
StringRef name = ".block_descriptor";
// Create the descriptor for the parameter.
llvm::DIVariable debugVar =
DBuilder.createLocalVariable(llvm::dwarf::DW_TAG_arg_variable,
llvm::DIDescriptor(scope),
name, tunit, line, type,
CGM.getLangOptions().Optimize, flags,
cast<llvm::Argument>(addr)->getArgNo() + 1);
// Insert an llvm.dbg.value into the current block.
llvm::Instruction *declare =
DBuilder.insertDbgValueIntrinsic(addr, 0, debugVar,
Builder.GetInsertBlock());
declare->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
}
/// 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());
setLocation(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);
}
StringRef DeclName = D->getName();
StringRef LinkageName;
if (D->getDeclContext() && !isa<FunctionDecl>(D->getDeclContext())
&& !isa<ObjCMethodDecl>(D->getDeclContext()))
LinkageName = Var->getName();
if (LinkageName == DeclName)
LinkageName = StringRef();
llvm::DIDescriptor DContext =
getContextDescriptor(dyn_cast<Decl>(D->getDeclContext()));
DBuilder.createStaticVariable(DContext, DeclName, LinkageName,
Unit, LineNo, getOrCreateType(T, Unit),
Var->hasInternalLinkage(), 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());
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);
}
DBuilder.createGlobalVariable(Name, Unit, LineNo,
getOrCreateType(T, Unit),
Var->hasInternalLinkage(), Var);
}
/// EmitGlobalVariable - Emit global variable's debug info.
void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
llvm::Constant *Init) {
// Create the descriptor for the variable.
llvm::DIFile Unit = getOrCreateFile(VD->getLocation());
StringRef Name = VD->getName();
llvm::DIType Ty = getOrCreateType(VD->getType(), Unit);
if (const EnumConstantDecl *ECD = dyn_cast<EnumConstantDecl>(VD)) {
if (const EnumDecl *ED = dyn_cast<EnumDecl>(ECD->getDeclContext()))
Ty = CreateEnumType(ED);
}
// Do not use DIGlobalVariable for enums.
if (Ty.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
return;
DBuilder.createStaticVariable(Unit, Name, Name, Unit,
getLineNumber(VD->getLocation()),
Ty, true, Init);
}
/// getOrCreateNamesSpace - Return namespace descriptor for the given
/// namespace decl.
llvm::DINameSpace
CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
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::DIFile FileD = getOrCreateFile(NSDecl->getLocation());
llvm::DIDescriptor Context =
getContextDescriptor(dyn_cast<Decl>(NSDecl->getDeclContext()));
llvm::DINameSpace NS =
DBuilder.createNameSpace(Context, NSDecl->getName(), FileD, LineNo);
NameSpaceCache[NSDecl] = llvm::WeakVH(NS);
return NS;
}
/// UpdateCompletedType - Update type cache because the type is now
/// translated.
void CGDebugInfo::UpdateCompletedType(const TagDecl *TD) {
QualType Ty = CGM.getContext().getTagDeclType(TD);
// If the type exist in type cache then remove it from the cache.
// There is no need to prepare debug info for the completed type
// right now. It will be generated on demand lazily.
llvm::DenseMap<void *, llvm::WeakVH>::iterator it =
TypeCache.find(Ty.getAsOpaquePtr());
if (it != TypeCache.end())
TypeCache.erase(it);
}
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