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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 "CGBlocks.h"
#include "CGCXXABI.h"
#include "CGObjCRuntime.h"
#include "CodeGenFunction.h"
#include "CodeGenModule.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/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/Version.h"
#include "clang/Frontend/CodeGenOptions.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
using namespace clang;
using namespace clang::CodeGen;
CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
: CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
DBuilder(CGM.getModule()) {
CreateCompileUnit();
}
CGDebugInfo::~CGDebugInfo() {
assert(LexicalBlockStack.empty() &&
"Region stack mismatch, stack not empty!");
}
ArtificialLocation::ArtificialLocation(CodeGenFunction &CGF)
: ApplyDebugLocation(CGF) {
if (auto *DI = CGF.getDebugInfo()) {
// Construct a location that has a valid scope, but no line info.
assert(!DI->LexicalBlockStack.empty());
llvm::DIDescriptor Scope(DI->LexicalBlockStack.back());
CGF.Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(0, 0, Scope));
}
}
ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF,
SourceLocation TemporaryLocation)
: CGF(CGF) {
if (auto *DI = CGF.getDebugInfo()) {
OriginalLocation = CGF.Builder.getCurrentDebugLocation();
if (TemporaryLocation.isInvalid())
CGF.Builder.SetCurrentDebugLocation(llvm::DebugLoc());
else
DI->EmitLocation(CGF.Builder, TemporaryLocation);
}
}
ApplyDebugLocation::ApplyDebugLocation(CodeGenFunction &CGF, llvm::DebugLoc Loc)
: CGF(CGF) {
if (CGF.getDebugInfo()) {
OriginalLocation = CGF.Builder.getCurrentDebugLocation();
if (!Loc.isUnknown())
CGF.Builder.SetCurrentDebugLocation(Loc);
}
}
ApplyDebugLocation::~ApplyDebugLocation() {
// Query CGF so the location isn't overwritten when location updates are
// temporarily disabled (for C++ default function arguments)
if (CGF.getDebugInfo())
CGF.Builder.SetCurrentDebugLocation(OriginalLocation);
}
/// ArtificialLocation - An RAII object that temporarily switches to
/// an artificial debug location that has a valid scope, but no line
void CGDebugInfo::setLocation(SourceLocation Loc) {
// If the new location isn't valid return.
if (Loc.isInvalid())
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();
llvm::DIScope Scope(LexicalBlockStack.back());
PresumedLoc PCLoc = SM.getPresumedLoc(CurLoc);
if (PCLoc.isInvalid() || Scope.getFilename() == PCLoc.getFilename())
return;
if (Scope.isLexicalBlockFile()) {
llvm::DILexicalBlockFile LBF = llvm::DILexicalBlockFile(Scope);
llvm::DIDescriptor D = DBuilder.createLexicalBlockFile(
LBF.getScope(), getOrCreateFile(CurLoc));
llvm::MDNode *N = D;
LexicalBlockStack.pop_back();
LexicalBlockStack.emplace_back(N);
} else if (Scope.isLexicalBlock() || Scope.isSubprogram()) {
llvm::DIDescriptor D =
DBuilder.createLexicalBlockFile(Scope, getOrCreateFile(CurLoc));
llvm::MDNode *N = D;
LexicalBlockStack.pop_back();
LexicalBlockStack.emplace_back(N);
}
}
/// getContextDescriptor - Get context info for the decl.
llvm::DIScope CGDebugInfo::getContextDescriptor(const Decl *Context) {
if (!Context)
return TheCU;
auto I = RegionMap.find(Context);
if (I != RegionMap.end()) {
llvm::Metadata *V = I->second;
return llvm::DIScope(dyn_cast_or_null<llvm::MDNode>(V));
}
// Check namespace.
if (const NamespaceDecl *NSDecl = dyn_cast<NamespaceDecl>(Context))
return getOrCreateNameSpace(NSDecl);
if (const RecordDecl *RDecl = dyn_cast<RecordDecl>(Context))
if (!RDecl->isDependentType())
return getOrCreateType(CGM.getContext().getTypeDeclType(RDecl),
getOrCreateMainFile());
return TheCU;
}
/// getFunctionName - Get function name for the given FunctionDecl. If the
/// name is constructed on demand (e.g. C++ destructor) then the name
/// is stored on the side.
StringRef CGDebugInfo::getFunctionName(const FunctionDecl *FD) {
assert(FD && "Invalid FunctionDecl!");
IdentifierInfo *FII = FD->getIdentifier();
FunctionTemplateSpecializationInfo *Info =
FD->getTemplateSpecializationInfo();
if (!Info && FII)
return FII->getName();
// Otherwise construct human readable name for debug info.
SmallString<128> NS;
llvm::raw_svector_ostream OS(NS);
FD->printName(OS);
// Add any template specialization args.
if (Info) {
const TemplateArgumentList *TArgs = Info->TemplateArguments;
const TemplateArgument *Args = TArgs->data();
unsigned NumArgs = TArgs->size();
PrintingPolicy Policy(CGM.getLangOpts());
TemplateSpecializationType::PrintTemplateArgumentList(OS, Args, NumArgs,
Policy);
}
// Copy this name on the side and use its reference.
return internString(OS.str());
}
StringRef CGDebugInfo::getObjCMethodName(const ObjCMethodDecl *OMD) {
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 << ((const NamedDecl *)OCD)->getIdentifier()->getNameStart() << '('
<< OCD->getIdentifier()->getNameStart() << ')';
} else if (isa<ObjCProtocolDecl>(DC)) {
// We can extract the type of the class from the self pointer.
if (ImplicitParamDecl *SelfDecl = OMD->getSelfDecl()) {
QualType ClassTy =
cast<ObjCObjectPointerType>(SelfDecl->getType())->getPointeeType();
ClassTy.print(OS, PrintingPolicy(LangOptions()));
}
}
OS << ' ' << OMD->getSelector().getAsString() << ']';
return internString(OS.str());
}
/// getSelectorName - Return selector name. This is used for debugging
/// info.
StringRef CGDebugInfo::getSelectorName(Selector S) {
return internString(S.getAsString());
}
/// getClassName - Get class name including template argument list.
StringRef CGDebugInfo::getClassName(const RecordDecl *RD) {
// quick optimization to avoid having to intern strings that are already
// stored reliably elsewhere
if (!isa<ClassTemplateSpecializationDecl>(RD))
return RD->getName();
SmallString<128> Name;
{
llvm::raw_svector_ostream OS(Name);
RD->getNameForDiagnostic(OS, CGM.getContext().getPrintingPolicy(),
/*Qualified*/ false);
}
// Copy this name on the side and use its reference.
return internString(Name);
}
/// 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();
auto it = DIFileCache.find(fname);
if (it != DIFileCache.end()) {
// Verify that the information still exists.
if (llvm::Metadata *V = it->second)
return llvm::DIFile(cast<llvm::MDNode>(V));
}
llvm::DIFile F = DBuilder.createFile(PLoc.getFilename(), getCurrentDirname());
DIFileCache[fname].reset(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) {
if (Loc.isInvalid() && CurLoc.isInvalid())
return 0;
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.
unsigned CGDebugInfo::getColumnNumber(SourceLocation Loc, bool Force) {
// We may not want column information at all.
if (!Force && !CGM.getCodeGenOpts().DebugColumnInfo)
return 0;
// If the location is invalid then use the current column.
if (Loc.isInvalid() && CurLoc.isInvalid())
return 0;
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;
SmallString<256> CWD;
llvm::sys::fs::current_path(CWD);
return CWDName = internString(CWD);
}
/// CreateCompileUnit - Create new compile unit.
void CGDebugInfo::CreateCompileUnit() {
// Should we be asking the SourceManager for the main file name, instead of
// accepting it as an argument? This just causes the main file name to
// mismatch with source locations and create extra lexical scopes or
// mismatched debug info (a CU with a DW_AT_file of "-", because that's what
// the driver passed, but functions/other things have DW_AT_file of "<stdin>"
// because that's what the SourceManager says)
// Get absolute path name.
SourceManager &SM = CGM.getContext().getSourceManager();
std::string MainFileName = CGM.getCodeGenOpts().MainFileName;
if (MainFileName.empty())
MainFileName = "<stdin>";
// 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 != ".") {
llvm::SmallString<1024> MainFileDirSS(MainFileDir);
llvm::sys::path::append(MainFileDirSS, MainFileName);
MainFileName = MainFileDirSS.str();
}
}
// Save filename string.
StringRef Filename = internString(MainFileName);
// Save split dwarf file string.
std::string SplitDwarfFile = CGM.getCodeGenOpts().SplitDwarfFile;
StringRef SplitDwarfFilename = internString(SplitDwarfFile);
llvm::dwarf::SourceLanguage LangTag;
const LangOptions &LO = CGM.getLangOpts();
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.ObjCRuntime.isNonFragile() ? 2 : 1;
// Create new compile unit.
// FIXME - Eliminate TheCU.
TheCU = DBuilder.createCompileUnit(
LangTag, Filename, getCurrentDirname(), Producer, LO.Optimize,
CGM.getCodeGenOpts().DwarfDebugFlags, RuntimeVers, SplitDwarfFilename,
DebugKind <= CodeGenOptions::DebugLineTablesOnly
? llvm::DIBuilder::LineTablesOnly
: llvm::DIBuilder::FullDebug,
DebugKind != CodeGenOptions::LocTrackingOnly);
}
/// CreateType - Get the Basic type from the cache or create a new
/// one if necessary.
llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT) {
llvm::dwarf::TypeKind Encoding;
StringRef BTName;
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();
case BuiltinType::Void:
return llvm::DIType();
case BuiltinType::ObjCClass:
if (!ClassTy)
ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
"objc_class", TheCU,
getOrCreateMainFile(), 0);
return ClassTy;
case BuiltinType::ObjCId: {
// typedef struct objc_class *Class;
// typedef struct objc_object {
// Class isa;
// } *id;
if (ObjTy)
return ObjTy;
if (!ClassTy)
ClassTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
"objc_class", TheCU,
getOrCreateMainFile(), 0);
unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
llvm::DIType ISATy = DBuilder.createPointerType(ClassTy, Size);
ObjTy =
DBuilder.createStructType(TheCU, "objc_object", getOrCreateMainFile(),
0, 0, 0, 0, llvm::DIType(), llvm::DIArray());
DBuilder.replaceArrays(
ObjTy,
DBuilder.getOrCreateArray(&*DBuilder.createMemberType(
ObjTy, "isa", getOrCreateMainFile(), 0, Size, 0, 0, 0, ISATy)));
return ObjTy;
}
case BuiltinType::ObjCSel: {
if (!SelTy)
SelTy = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type,
"objc_selector", TheCU,
getOrCreateMainFile(), 0);
return SelTy;
}
case BuiltinType::OCLImage1d:
return getOrCreateStructPtrType("opencl_image1d_t", OCLImage1dDITy);
case BuiltinType::OCLImage1dArray:
return getOrCreateStructPtrType("opencl_image1d_array_t",
OCLImage1dArrayDITy);
case BuiltinType::OCLImage1dBuffer:
return getOrCreateStructPtrType("opencl_image1d_buffer_t",
OCLImage1dBufferDITy);
case BuiltinType::OCLImage2d:
return getOrCreateStructPtrType("opencl_image2d_t", OCLImage2dDITy);
case BuiltinType::OCLImage2dArray:
return getOrCreateStructPtrType("opencl_image2d_array_t",
OCLImage2dArrayDITy);
case BuiltinType::OCLImage3d:
return getOrCreateStructPtrType("opencl_image3d_t", OCLImage3dDITy);
case BuiltinType::OCLSampler:
return DBuilder.createBasicType(
"opencl_sampler_t", CGM.getContext().getTypeSize(BT),
CGM.getContext().getTypeAlign(BT), llvm::dwarf::DW_ATE_unsigned);
case BuiltinType::OCLEvent:
return getOrCreateStructPtrType("opencl_event_t", OCLEventDITy);
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.getLangOpts());
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.
llvm::dwarf::TypeKind 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.
llvm::dwarf::Tag 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) {
// The frontend treats 'id' as a typedef to an ObjCObjectType,
// whereas 'id<protocol>' is treated as an ObjCPointerType. For the
// debug info, we want to emit 'id' in both cases.
if (Ty->isObjCQualifiedIdType())
return getOrCreateType(CGM.getContext().getObjCIdType(), 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);
}
/// In C++ mode, types have linkage, so we can rely on the ODR and
/// on their mangled names, if they're external.
static SmallString<256> getUniqueTagTypeName(const TagType *Ty,
CodeGenModule &CGM,
llvm::DICompileUnit TheCU) {
SmallString<256> FullName;
// FIXME: ODR should apply to ObjC++ exactly the same wasy it does to C++.
// For now, only apply ODR with C++.
const TagDecl *TD = Ty->getDecl();
if (TheCU.getLanguage() != llvm::dwarf::DW_LANG_C_plus_plus ||
!TD->isExternallyVisible())
return FullName;
// Microsoft Mangler does not have support for mangleCXXRTTIName yet.
if (CGM.getTarget().getCXXABI().isMicrosoft())
return FullName;
// TODO: This is using the RTTI name. Is there a better way to get
// a unique string for a type?
llvm::raw_svector_ostream Out(FullName);
CGM.getCXXABI().getMangleContext().mangleCXXRTTIName(QualType(Ty, 0), Out);
Out.flush();
return FullName;
}
// Creates a forward declaration for a RecordDecl in the given context.
llvm::DICompositeType
CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
llvm::DIDescriptor Ctx) {
const RecordDecl *RD = Ty->getDecl();
if (llvm::DIType T = getTypeOrNull(CGM.getContext().getRecordType(RD)))
return llvm::DICompositeType(T);
llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
unsigned Line = getLineNumber(RD->getLocation());
StringRef RDName = getClassName(RD);
llvm::dwarf::Tag Tag;
if (RD->isStruct() || RD->isInterface())
Tag = llvm::dwarf::DW_TAG_structure_type;
else if (RD->isUnion())
Tag = llvm::dwarf::DW_TAG_union_type;
else {
assert(RD->isClass());
Tag = llvm::dwarf::DW_TAG_class_type;
}
// Create the type.
SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
llvm::DICompositeType RetTy = DBuilder.createReplaceableForwardDecl(
Tag, RDName, Ctx, DefUnit, Line, 0, 0, 0, FullName);
ReplaceMap.emplace_back(
std::piecewise_construct, std::make_tuple(Ty),
std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
return RetTy;
}
llvm::DIType CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
const Type *Ty,
QualType PointeeTy,
llvm::DIFile Unit) {
if (Tag == llvm::dwarf::DW_TAG_reference_type ||
Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
return DBuilder.createReferenceType(Tag, 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.
unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
uint64_t Size = CGM.getTarget().getPointerWidth(AS);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
Align);
}
llvm::DIType CGDebugInfo::getOrCreateStructPtrType(StringRef Name,
llvm::DIType &Cache) {
if (Cache)
return Cache;
Cache = DBuilder.createForwardDecl(llvm::dwarf::DW_TAG_structure_type, Name,
TheCU, getOrCreateMainFile(), 0);
unsigned Size = CGM.getContext().getTypeSize(CGM.getContext().VoidPtrTy);
Cache = DBuilder.createPointerType(Cache, Size);
return Cache;
}
llvm::DIType CGDebugInfo::CreateType(const BlockPointerType *Ty,
llvm::DIFile Unit) {
if (BlockLiteralGeneric)
return BlockLiteralGeneric;
SmallVector<llvm::Metadata *, 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, llvm::DIType(),
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(Ty->getPointeeType());
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,
llvm::DIType(), Elements);
BlockLiteralGeneric = DBuilder.createPointerType(EltTy, Size);
return BlockLiteralGeneric;
}
llvm::DIType CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
llvm::DIFile Unit) {
assert(Ty->isTypeAlias());
llvm::DIType Src = getOrCreateType(Ty->getAliasedType(), Unit);
SmallString<128> NS;
llvm::raw_svector_ostream OS(NS);
Ty->getTemplateName().print(OS, CGM.getContext().getPrintingPolicy(),
/*qualified*/ false);
TemplateSpecializationType::PrintTemplateArgumentList(
OS, Ty->getArgs(), Ty->getNumArgs(),
CGM.getContext().getPrintingPolicy());
TypeAliasDecl *AliasDecl = cast<TypeAliasTemplateDecl>(
Ty->getTemplateName().getAsTemplateDecl())->getTemplatedDecl();
SourceLocation Loc = AliasDecl->getLocation();
llvm::DIFile File = getOrCreateFile(Loc);
unsigned Line = getLineNumber(Loc);
llvm::DIDescriptor Ctxt =
getContextDescriptor(cast<Decl>(AliasDecl->getDeclContext()));
return DBuilder.createTypedef(Src, internString(OS.str()), File, Line, Ctxt);
}
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.
SourceLocation Loc = Ty->getDecl()->getLocation();
llvm::DIFile File = getOrCreateFile(Loc);
unsigned Line = getLineNumber(Loc);
const TypedefNameDecl *TyDecl = Ty->getDecl();
llvm::DIDescriptor TypedefContext =
getContextDescriptor(cast<Decl>(Ty->getDecl()->getDeclContext()));
return DBuilder.createTypedef(Src, TyDecl->getName(), File, Line,
TypedefContext);
}
llvm::DIType CGDebugInfo::CreateType(const FunctionType *Ty,
llvm::DIFile Unit) {
SmallVector<llvm::Metadata *, 16> EltTys;
// Add the result type at least.
EltTys.push_back(getOrCreateType(Ty->getReturnType(), Unit));
// Set up remainder of arguments if there is a prototype.
// otherwise emit it as a variadic function.
if (isa<FunctionNoProtoType>(Ty))
EltTys.push_back(DBuilder.createUnspecifiedParameter());
else if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(Ty)) {
for (unsigned i = 0, e = FPT->getNumParams(); i != e; ++i)
EltTys.push_back(getOrCreateType(FPT->getParamType(i), Unit));
if (FPT->isVariadic())
EltTys.push_back(DBuilder.createUnspecifiedParameter());
}
llvm::DITypeArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
return DBuilder.createSubroutineType(Unit, EltTypeArray);
}
/// Convert an AccessSpecifier into the corresponding DIDescriptor flag.
/// As an optimization, return 0 if the access specifier equals the
/// default for the containing type.
static unsigned getAccessFlag(AccessSpecifier Access, const RecordDecl *RD) {
AccessSpecifier Default = clang::AS_none;
if (RD && RD->isClass())
Default = clang::AS_private;
else if (RD && (RD->isStruct() || RD->isUnion()))
Default = clang::AS_public;
if (Access == Default)
return 0;
switch (Access) {
case clang::AS_private:
return llvm::DIDescriptor::FlagPrivate;
case clang::AS_protected:
return llvm::DIDescriptor::FlagProtected;
case clang::AS_public:
return llvm::DIDescriptor::FlagPublic;
case clang::AS_none:
return 0;
}
llvm_unreachable("unexpected access enumerator");
}
llvm::DIType CGDebugInfo::createFieldType(
StringRef name, QualType type, uint64_t sizeInBitsOverride,
SourceLocation loc, AccessSpecifier AS, uint64_t offsetInBits,
llvm::DIFile tunit, llvm::DIScope scope, const RecordDecl *RD) {
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()) {
TypeInfo TI = CGM.getContext().getTypeInfo(type);
SizeInBits = TI.Width;
AlignInBits = TI.Align;
if (sizeInBitsOverride)
SizeInBits = sizeInBitsOverride;
}
unsigned flags = getAccessFlag(AS, RD);
return DBuilder.createMemberType(scope, name, file, line, SizeInBits,
AlignInBits, offsetInBits, flags, debugType);
}
/// CollectRecordLambdaFields - Helper for CollectRecordFields.
void CGDebugInfo::CollectRecordLambdaFields(
const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
llvm::DIType RecordTy) {
// For C++11 Lambdas a Field will be the same as a Capture, but the Capture
// has the name and the location of the variable so we should iterate over
// both concurrently.
const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
RecordDecl::field_iterator Field = CXXDecl->field_begin();
unsigned fieldno = 0;
for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
E = CXXDecl->captures_end();
I != E; ++I, ++Field, ++fieldno) {
const LambdaCapture &C = *I;
if (C.capturesVariable()) {
VarDecl *V = C.getCapturedVar();
llvm::DIFile VUnit = getOrCreateFile(C.getLocation());
StringRef VName = V->getName();
uint64_t SizeInBitsOverride = 0;
if (Field->isBitField()) {
SizeInBitsOverride = Field->getBitWidthValue(CGM.getContext());
assert(SizeInBitsOverride && "found named 0-width bitfield");
}
llvm::DIType fieldType = createFieldType(
VName, Field->getType(), SizeInBitsOverride, C.getLocation(),
Field->getAccess(), layout.getFieldOffset(fieldno), VUnit, RecordTy,
CXXDecl);
elements.push_back(fieldType);
} else if (C.capturesThis()) {
// TODO: Need to handle 'this' in some way by probably renaming the
// this of the lambda class and having a field member of 'this' or
// by using AT_object_pointer for the function and having that be
// used as 'this' for semantic references.
FieldDecl *f = *Field;
llvm::DIFile VUnit = getOrCreateFile(f->getLocation());
QualType type = f->getType();
llvm::DIType fieldType = createFieldType(
"this", type, 0, f->getLocation(), f->getAccess(),
layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
elements.push_back(fieldType);
}
}
}
/// Helper for CollectRecordFields.
llvm::DIDerivedType CGDebugInfo::CreateRecordStaticField(const VarDecl *Var,
llvm::DIType RecordTy,
const RecordDecl *RD) {
// Create the descriptor for the static variable, with or without
// constant initializers.
Var = Var->getCanonicalDecl();
llvm::DIFile VUnit = getOrCreateFile(Var->getLocation());
llvm::DIType VTy = getOrCreateType(Var->getType(), VUnit);
unsigned LineNumber = getLineNumber(Var->getLocation());
StringRef VName = Var->getName();
llvm::Constant *C = nullptr;
if (Var->getInit()) {
const APValue *Value = Var->evaluateValue();
if (Value) {
if (Value->isInt())
C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
if (Value->isFloat())
C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
}
}
unsigned Flags = getAccessFlag(Var->getAccess(), RD);
llvm::DIDerivedType GV = DBuilder.createStaticMemberType(
RecordTy, VName, VUnit, LineNumber, VTy, Flags, C);
StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
return GV;
}
/// CollectRecordNormalField - Helper for CollectRecordFields.
void CGDebugInfo::CollectRecordNormalField(
const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile tunit,
SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType RecordTy,
const RecordDecl *RD) {
StringRef name = field->getName();
QualType type = field->getType();
// Ignore unnamed fields unless they're anonymous structs/unions.
if (name.empty() && !type->isRecordType())
return;
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(), OffsetInBits, tunit, RecordTy, RD);
elements.push_back(fieldType);
}
/// 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::Metadata *> &elements,
llvm::DICompositeType RecordTy) {
const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(record);
if (CXXDecl && CXXDecl->isLambda())
CollectRecordLambdaFields(CXXDecl, elements, RecordTy);
else {
const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(record);
// Field number for non-static fields.
unsigned fieldNo = 0;
// Static and non-static members should appear in the same order as
// the corresponding declarations in the source program.
for (const auto *I : record->decls())
if (const auto *V = dyn_cast<VarDecl>(I)) {
// Reuse the existing static member declaration if one exists
auto MI = StaticDataMemberCache.find(V->getCanonicalDecl());
if (MI != StaticDataMemberCache.end()) {
assert(MI->second &&
"Static data member declaration should still exist");
elements.push_back(
llvm::DIDerivedType(cast<llvm::MDNode>(MI->second)));
} else {
auto Field = CreateRecordStaticField(V, RecordTy, record);
elements.push_back(Field);
}
} else if (const auto *field = dyn_cast<FieldDecl>(I)) {
CollectRecordNormalField(field, layout.getFieldOffset(fieldNo), tunit,
elements, RecordTy, record);
// Bump field number for next field.
++fieldNo;
}
}
}
/// 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::DICompositeType
CGDebugInfo::getOrCreateMethodType(const CXXMethodDecl *Method,
llvm::DIFile Unit) {
const FunctionProtoType *Func = Method->getType()->getAs<FunctionProtoType>();
if (Method->isStatic())
return llvm::DICompositeType(getOrCreateType(QualType(Func, 0), Unit));
return getOrCreateInstanceMethodType(Method->getThisType(CGM.getContext()),
Func, Unit);
}
llvm::DICompositeType CGDebugInfo::getOrCreateInstanceMethodType(
QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile Unit) {
// Add "this" pointer.
llvm::DITypeArray Args = llvm::DISubroutineType(
getOrCreateType(QualType(Func, 0), Unit)).getTypeArray();
assert(Args.getNumElements() && "Invalid number of arguments!");
SmallVector<llvm::Metadata *, 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.
const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
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.getTarget().getPointerWidth(AS);
uint64_t Align = CGM.getContext().getTypeAlign(ThisPtrTy);
llvm::DIType PointeeType = getOrCreateType(PointeeTy, Unit);
llvm::DIType ThisPtrType =
DBuilder.createPointerType(PointeeType, Size, Align);
TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
// TODO: This and the artificial type below are misleading, the
// types aren't artificial the argument is, but the current
// metadata doesn't represent that.
ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
Elts.push_back(ThisPtrType);
} else {
llvm::DIType ThisPtrType = getOrCreateType(ThisPtr, Unit);
TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
ThisPtrType = DBuilder.createObjectPointerType(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::DITypeArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
unsigned Flags = 0;
if (Func->getExtProtoInfo().RefQualifier == RQ_LValue)
Flags |= llvm::DIDescriptor::FlagLValueReference;
if (Func->getExtProtoInfo().RefQualifier == RQ_RValue)
Flags |= llvm::DIDescriptor::FlagRValueReference;
return DBuilder.createSubroutineType(Unit, EltTypeArray, Flags);
}
/// 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::DICompositeType 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;
unsigned MethodLine = 0;
if (!Method->isImplicit()) {
MethodDefUnit = getOrCreateFile(Method->getLocation());
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.
// FIXME: Add proper support for debug info for virtual calls in
// the Microsoft ABI, where we may use multiple vptrs to make a vftable
// lookup if we have multiple or virtual inheritance.
if (!isa<CXXDestructorDecl>(Method) &&
!CGM.getTarget().getCXXABI().isMicrosoft())
VIndex = CGM.getItaniumVTableContext().getMethodVTableIndex(Method);
ContainingType = RecordTy;
}
unsigned Flags = 0;
if (Method->isImplicit())
Flags |= llvm::DIDescriptor::FlagArtificial;
Flags |= getAccessFlag(Method->getAccess(), Method->getParent());
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;
if (Method->getRefQualifier() == RQ_LValue)
Flags |= llvm::DIDescriptor::FlagLValueReference;
if (Method->getRefQualifier() == RQ_RValue)
Flags |= llvm::DIDescriptor::FlagRValueReference;
llvm::DIArray TParamsArray = CollectFunctionTemplateParams(Method, Unit);
llvm::DISubprogram SP = DBuilder.createMethod(
RecordTy, MethodName, MethodLinkageName, MethodDefUnit, MethodLine,
MethodTy, /*isLocalToUnit=*/false,
/* isDefinition=*/false, Virtuality, VIndex, ContainingType, Flags,
CGM.getLangOpts().Optimize, nullptr, TParamsArray);
SPCache[Method->getCanonicalDecl()].reset(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::Metadata *> &EltTys, llvm::DIType RecordTy) {
// Since we want more than just the individual member decls if we
// have templated functions iterate over every declaration to gather
// the functions.
for (const auto *I : RD->decls()) {
const auto *Method = dyn_cast<CXXMethodDecl>(I);
// If the member is implicit, don't add it to the member list. This avoids
// the member being added to type units by LLVM, while still allowing it
// to be emitted into the type declaration/reference inside the compile
// unit.
// FIXME: Handle Using(Shadow?)Decls here to create
// DW_TAG_imported_declarations inside the class for base decls brought into
// derived classes. GDB doesn't seem to notice/leverage these when I tried
// it, so I'm not rushing to fix this. (GCC seems to produce them, if
// referenced)
if (!Method || Method->isImplicit())
continue;
if (Method->getType()->getAs<FunctionProtoType>()->getContainedAutoType())
continue;
// Reuse the existing member function declaration if it exists.
// It may be associated with the declaration of the type & should be
// reused as we're building the definition.
//
// This situation can arise in the vtable-based debug info reduction where
// implicit members are emitted in a non-vtable TU.
auto MI = SPCache.find(Method->getCanonicalDecl());
EltTys.push_back(MI == SPCache.end()
? CreateCXXMemberFunction(Method, Unit, RecordTy)
: static_cast<llvm::Metadata *>(MI->second));
}
}
/// 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::Metadata *> &EltTys,
llvm::DIType RecordTy) {
const ASTRecordLayout &RL = CGM.getContext().getASTRecordLayout(RD);
for (const auto &BI : RD->bases()) {
unsigned BFlags = 0;
uint64_t BaseOffset;
const CXXRecordDecl *Base =
cast<CXXRecordDecl>(BI.getType()->getAs<RecordType>()->getDecl());
if (BI.isVirtual()) {
if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
// virtual base offset offset is -ve. The code generator emits dwarf
// expression where it expects +ve number.
BaseOffset = 0 - CGM.getItaniumVTableContext()
.getVirtualBaseOffsetOffset(RD, Base)
.getQuantity();
} else {
// In the MS ABI, store the vbtable offset, which is analogous to the
// vbase offset offset in Itanium.
BaseOffset =
4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
}
BFlags = llvm::DIDescriptor::FlagVirtual;
} else
BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
// FIXME: Inconsistent units for BaseOffset. It is in bytes when
// BI->isVirtual() and bits when not.
BFlags |= getAccessFlag(BI.getAccessSpecifier(), RD);
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,
ArrayRef<TemplateArgument> TAList,
llvm::DIFile Unit) {
SmallVector<llvm::Metadata *, 16> TemplateParams;
for (unsigned i = 0, e = TAList.size(); i != e; ++i) {
const TemplateArgument &TA = TAList[i];
StringRef Name;
if (TPList)
Name = TPList->getParam(i)->getName();
switch (TA.getKind()) {
case TemplateArgument::Type: {
llvm::DIType TTy = getOrCreateType(TA.getAsType(), Unit);
llvm::DITemplateTypeParameter TTP =
DBuilder.createTemplateTypeParameter(TheCU, Name, TTy);
TemplateParams.push_back(TTP);
} break;
case TemplateArgument::Integral: {
llvm::DIType TTy = getOrCreateType(TA.getIntegralType(), Unit);
llvm::DITemplateValueParameter TVP =
DBuilder.createTemplateValueParameter(
TheCU, Name, TTy,
llvm::ConstantInt::get(CGM.getLLVMContext(), TA.getAsIntegral()));
TemplateParams.push_back(TVP);
} break;
case TemplateArgument::Declaration: {
const ValueDecl *D = TA.getAsDecl();
QualType T = TA.getParamTypeForDecl().getDesugaredType(CGM.getContext());
llvm::DIType TTy = getOrCreateType(T, Unit);
llvm::Constant *V = nullptr;
const CXXMethodDecl *MD;
// Variable pointer template parameters have a value that is the address
// of the variable.
if (const auto *VD = dyn_cast<VarDecl>(D))
V = CGM.GetAddrOfGlobalVar(VD);
// Member function pointers have special support for building them, though
// this is currently unsupported in LLVM CodeGen.
else if ((MD = dyn_cast<CXXMethodDecl>(D)) && MD->isInstance())
V = CGM.getCXXABI().EmitMemberPointer(MD);
else if (const auto *FD = dyn_cast<FunctionDecl>(D))
V = CGM.GetAddrOfFunction(FD);
// Member data pointers have special handling too to compute the fixed
// offset within the object.
else if (const auto *MPT = dyn_cast<MemberPointerType>(T.getTypePtr())) {
// These five lines (& possibly the above member function pointer
// handling) might be able to be refactored to use similar code in
// CodeGenModule::getMemberPointerConstant
uint64_t fieldOffset = CGM.getContext().getFieldOffset(D);
CharUnits chars =
CGM.getContext().toCharUnitsFromBits((int64_t)fieldOffset);
V = CGM.getCXXABI().EmitMemberDataPointer(MPT, chars);
}
llvm::DITemplateValueParameter TVP =
DBuilder.createTemplateValueParameter(
TheCU, Name, TTy,
cast_or_null<llvm::Constant>(V->stripPointerCasts()));
TemplateParams.push_back(TVP);
} break;
case TemplateArgument::NullPtr: {
QualType T = TA.getNullPtrType();
llvm::DIType TTy = getOrCreateType(T, Unit);
llvm::Constant *V = nullptr;
// Special case member data pointer null values since they're actually -1
// instead of zero.
if (const MemberPointerType *MPT =
dyn_cast<MemberPointerType>(T.getTypePtr()))
// But treat member function pointers as simple zero integers because
// it's easier than having a special case in LLVM's CodeGen. If LLVM
// CodeGen grows handling for values of non-null member function
// pointers then perhaps we could remove this special case and rely on
// EmitNullMemberPointer for member function pointers.
if (MPT->isMemberDataPointer())
V = CGM.getCXXABI().EmitNullMemberPointer(MPT);
if (!V)
V = llvm::ConstantInt::get(CGM.Int8Ty, 0);
llvm::DITemplateValueParameter TVP =
DBuilder.createTemplateValueParameter(TheCU, Name, TTy,
cast<llvm::Constant>(V));
TemplateParams.push_back(TVP);
} break;
case TemplateArgument::Template: {
llvm::DITemplateValueParameter
TVP = DBuilder.createTemplateTemplateParameter(
TheCU, Name, llvm::DIType(),
TA.getAsTemplate().getAsTemplateDecl()->getQualifiedNameAsString());
TemplateParams.push_back(TVP);
} break;
case TemplateArgument::Pack: {
llvm::DITemplateValueParameter TVP = DBuilder.createTemplateParameterPack(
TheCU, Name, llvm::DIType(),
CollectTemplateParams(nullptr, TA.getPackAsArray(), Unit));
TemplateParams.push_back(TVP);
} break;
case TemplateArgument::Expression: {
const Expr *E = TA.getAsExpr();
QualType T = E->getType();
if (E->isGLValue())
T = CGM.getContext().getLValueReferenceType(T);
llvm::Constant *V = CGM.EmitConstantExpr(E, T);
assert(V && "Expression in template argument isn't constant");
llvm::DIType TTy = getOrCreateType(T, Unit);
llvm::DITemplateValueParameter TVP =
DBuilder.createTemplateValueParameter(
TheCU, Name, TTy, cast<llvm::Constant>(V->stripPointerCasts()));
TemplateParams.push_back(TVP);
} break;
// And the following should never occur:
case TemplateArgument::TemplateExpansion:
case TemplateArgument::Null:
llvm_unreachable(
"These argument types shouldn't exist in concrete types");
}
}
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()->asArray(), 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) {
// Always get the full list of parameters, not just the ones from
// the specialization.
TemplateParameterList *TPList =
TSpecial->getSpecializedTemplate()->getTemplateParameters();
const TemplateArgumentList &TAList = TSpecial->getTemplateArgs();
return CollectTemplateParams(TPList, TAList.asArray(), 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::Metadata *STy = getOrCreateType(Context.IntTy, Unit);
llvm::DITypeArray SElements = DBuilder.getOrCreateTypeArray(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) {
// Copy the gdb compatible name on the side and use its reference.
return internString("_vptr$", RD->getNameAsString());
}
/// 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::Metadata *> &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,
llvm::DIDescriptor::FlagArtificial, getOrCreateVTablePtrType(Unit));
EltTys.push_back(VPTR);
}
/// getOrCreateRecordType - Emit record type's standalone debug info.
llvm::DIType CGDebugInfo::getOrCreateRecordType(QualType RTy,
SourceLocation Loc) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
llvm::DIType T = getOrCreateType(RTy, getOrCreateFile(Loc));
return T;
}
/// getOrCreateInterfaceType - Emit an objective c interface type standalone
/// debug info.
llvm::DIType CGDebugInfo::getOrCreateInterfaceType(QualType D,
SourceLocation Loc) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
llvm::DIType T = getOrCreateType(D, getOrCreateFile(Loc));
RetainedTypes.push_back(D.getAsOpaquePtr());
return T;
}
void CGDebugInfo::completeType(const EnumDecl *ED) {
if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
return;
QualType Ty = CGM.getContext().getEnumType(ED);
void *TyPtr = Ty.getAsOpaquePtr();
auto I = TypeCache.find(TyPtr);
if (I == TypeCache.end() ||
!llvm::DIType(cast<llvm::MDNode>(I->second)).isForwardDecl())
return;
llvm::DIType Res = CreateTypeDefinition(Ty->castAs<EnumType>());
assert(!Res.isForwardDecl());
TypeCache[TyPtr].reset(Res);
}
void CGDebugInfo::completeType(const RecordDecl *RD) {
if (DebugKind > CodeGenOptions::LimitedDebugInfo ||
!CGM.getLangOpts().CPlusPlus)
completeRequiredType(RD);
}
void CGDebugInfo::completeRequiredType(const RecordDecl *RD) {
if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
return;
if (const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
if (CXXDecl->isDynamicClass())
return;
QualType Ty = CGM.getContext().getRecordType(RD);
llvm::DIType T = getTypeOrNull(Ty);
if (T && T.isForwardDecl())
completeClassData(RD);
}
void CGDebugInfo::completeClassData(const RecordDecl *RD) {
if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
return;
QualType Ty = CGM.getContext().getRecordType(RD);
void *TyPtr = Ty.getAsOpaquePtr();
auto I = TypeCache.find(TyPtr);
if (I != TypeCache.end() &&
!llvm::DIType(cast<llvm::MDNode>(I->second)).isForwardDecl())
return;
llvm::DIType Res = CreateTypeDefinition(Ty->castAs<RecordType>());
assert(!Res.isForwardDecl());
TypeCache[TyPtr].reset(Res);
}
static bool hasExplicitMemberDefinition(CXXRecordDecl::method_iterator I,
CXXRecordDecl::method_iterator End) {
for (; I != End; ++I)
if (FunctionDecl *Tmpl = I->getInstantiatedFromMemberFunction())
if (!Tmpl->isImplicit() && Tmpl->isThisDeclarationADefinition() &&
!I->getMemberSpecializationInfo()->isExplicitSpecialization())
return true;
return false;
}
static bool shouldOmitDefinition(CodeGenOptions::DebugInfoKind DebugKind,
const RecordDecl *RD,
const LangOptions &LangOpts) {
if (DebugKind > CodeGenOptions::LimitedDebugInfo)
return false;
if (!LangOpts.CPlusPlus)
return false;
if (!RD->isCompleteDefinitionRequired())
return true;
const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
if (!CXXDecl)
return false;
if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass())
return true;
TemplateSpecializationKind Spec = TSK_Undeclared;
if (const ClassTemplateSpecializationDecl *SD =
dyn_cast<ClassTemplateSpecializationDecl>(RD))
Spec = SD->getSpecializationKind();
if (Spec == TSK_ExplicitInstantiationDeclaration &&
hasExplicitMemberDefinition(CXXDecl->method_begin(),
CXXDecl->method_end()))
return true;
return false;
}
/// CreateType - get structure or union type.
llvm::DIType CGDebugInfo::CreateType(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();
llvm::DICompositeType T(getTypeOrNull(QualType(Ty, 0)));
if (T || shouldOmitDefinition(DebugKind, RD, CGM.getLangOpts())) {
if (!T)
T = getOrCreateRecordFwdDecl(
Ty, getContextDescriptor(cast<Decl>(RD->getDeclContext())));
return T;
}
return CreateTypeDefinition(Ty);
}
llvm::DIType CGDebugInfo::CreateTypeDefinition(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();
// Get overall information about the record type for the debug info.
llvm::DIFile DefUnit = getOrCreateFile(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::DICompositeType FwdDecl(getOrCreateLimitedType(Ty, DefUnit));
assert(FwdDecl.isCompositeType() &&
"The debug type of a RecordType should be a llvm::DICompositeType");
if (FwdDecl.isForwardDecl())
return FwdDecl;
if (const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD))
CollectContainingType(CXXDecl, FwdDecl);
// Push the struct on region stack.
LexicalBlockStack.emplace_back(&*FwdDecl);
RegionMap[Ty->getDecl()].reset(FwdDecl);
// Convert all the elements.
SmallVector<llvm::Metadata *, 16> EltTys;
// what about nested types?
// Note: The split of CXXDecl information here is intentional, the
// gdb tests will depend on a certain ordering at printout. The debug
// information offsets are still correct if we merge them all together
// though.
const CXXRecordDecl *CXXDecl = dyn_cast<CXXRecordDecl>(RD);
if (CXXDecl) {
CollectCXXBases(CXXDecl, DefUnit, EltTys, FwdDecl);
CollectVTableInfo(CXXDecl, DefUnit, EltTys);
}
// Collect data fields (including static variables and any initializers).
CollectRecordFields(RD, DefUnit, EltTys, FwdDecl);
if (CXXDecl)
CollectCXXMemberFunctions(CXXDecl, DefUnit, EltTys, FwdDecl);
LexicalBlockStack.pop_back();
RegionMap.erase(Ty->getDecl());
llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
DBuilder.replaceArrays(FwdDecl, Elements);
RegionMap[Ty->getDecl()].reset(FwdDecl);
return FwdDecl;
}
/// CreateType - get objective-c object type.
llvm::DIType CGDebugInfo::CreateType(const ObjCObjectType *Ty,
llvm::DIFile Unit) {
// Ignore protocols.
return getOrCreateType(Ty->getBaseType(), Unit);
}
/// \return true if Getter has the default name for the property PD.
static bool hasDefaultGetterName(const ObjCPropertyDecl *PD,
const ObjCMethodDecl *Getter) {
assert(PD);
if (!Getter)
return true;
assert(Getter->getDeclName().isObjCZeroArgSelector());
return PD->getName() ==
Getter->getDeclName().getObjCSelector().getNameForSlot(0);
}
/// \return true if Setter has the default name for the property PD.
static bool hasDefaultSetterName(const ObjCPropertyDecl *PD,
const ObjCMethodDecl *Setter) {
assert(PD);
if (!Setter)
return true;
assert(Setter->getDeclName().isObjCOneArgSelector());
return SelectorTable::constructSetterName(PD->getName()) ==
Setter->getDeclName().getObjCSelector().getNameForSlot(0);
}
/// 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());
llvm::dwarf::SourceLanguage 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.
ObjCInterfaceDecl *Def = ID->getDefinition();
if (!Def || !Def->getImplementation()) {
llvm::DIType FwdDecl = DBuilder.createReplaceableForwardDecl(
llvm::dwarf::DW_TAG_structure_type, ID->getName(), TheCU, DefUnit, Line,
RuntimeLang);
ObjCInterfaceCache.push_back(ObjCInterfaceCacheEntry(Ty, FwdDecl, Unit));
return FwdDecl;
}
return CreateTypeDefinition(Ty, Unit);
}
llvm::DIType CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
llvm::DIFile Unit) {
ObjCInterfaceDecl *ID = Ty->getDecl();
llvm::DIFile DefUnit = getOrCreateFile(ID->getLocation());
unsigned Line = getLineNumber(ID->getLocation());
unsigned RuntimeLang = TheCU.getLanguage();
// 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::DICompositeType RealDecl = DBuilder.createStructType(
Unit, ID->getName(), DefUnit, Line, Size, Align, Flags, llvm::DIType(),
llvm::DIArray(), RuntimeLang);
QualType QTy(Ty, 0);
TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
// Push the struct on region stack.
LexicalBlockStack.emplace_back(static_cast<llvm::MDNode *>(RealDecl));
RegionMap[Ty->getDecl()].reset(RealDecl);
// Convert all the elements.
SmallVector<llvm::Metadata *, 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(RealDecl, SClassTy, 0, 0);
EltTys.push_back(InhTag);
}
// Create entries for all of the properties.
for (const auto *PD : ID->properties()) {
SourceLocation Loc = PD->getLocation();
llvm::DIFile PUnit = getOrCreateFile(Loc);
unsigned PLine = getLineNumber(Loc);
ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
llvm::MDNode *PropertyNode = DBuilder.createObjCProperty(
PD->getName(), PUnit, PLine,
hasDefaultGetterName(PD, Getter) ? ""
: getSelectorName(PD->getGetterName()),
hasDefaultSetterName(PD, Setter) ? ""
: getSelectorName(PD->getSetterName()),
PD->getPropertyAttributes(), getOrCreateType(PD->getType(), PUnit));
EltTys.push_back(PropertyNode);
}
const ASTRecordLayout &RL = CGM.getContext().getASTObjCInterfaceLayout(ID);
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);
}
uint64_t FieldOffset;
if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
// We don't know the runtime offset of an ivar if we're using the
// non-fragile ABI. For bitfields, use the bit offset into the first
// byte of storage of the bitfield. For other fields, use zero.
if (Field->isBitField()) {
FieldOffset =
CGM.getObjCRuntime().ComputeBitfieldBitOffset(CGM, ID, Field);
FieldOffset %= CGM.getContext().getCharWidth();
} else {
FieldOffset = 0;
}
} else {
FieldOffset = 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;
else if (Field->getAccessControl() == ObjCIvarDecl::Public)
Flags = llvm::DIDescriptor::FlagPublic;
llvm::MDNode *PropertyNode = nullptr;
if (ObjCImplementationDecl *ImpD = ID->getImplementation()) {
if (ObjCPropertyImplDecl *PImpD =
ImpD->FindPropertyImplIvarDecl(Field->getIdentifier())) {
if (ObjCPropertyDecl *PD = PImpD->getPropertyDecl()) {
SourceLocation Loc = PD->getLocation();
llvm::DIFile PUnit = getOrCreateFile(Loc);
unsigned PLine = getLineNumber(Loc);
ObjCMethodDecl *Getter = PD->getGetterMethodDecl();
ObjCMethodDecl *Setter = PD->getSetterMethodDecl();
PropertyNode = DBuilder.createObjCProperty(
PD->getName(), PUnit, PLine,
hasDefaultGetterName(PD, Getter) ? "" : getSelectorName(
PD->getGetterName()),
hasDefaultSetterName(PD, Setter) ? "" : getSelectorName(
PD->getSetterName()),
PD->getPropertyAttributes(),
getOrCreateType(PD->getType(), PUnit));
}
}
}
FieldTy = DBuilder.createObjCIVar(FieldName, FieldDefUnit, FieldLine,
FieldSize, FieldAlign, FieldOffset, Flags,
FieldTy, PropertyNode);
EltTys.push_back(FieldTy);
}
llvm::DIArray Elements = DBuilder.getOrCreateArray(EltTys);
DBuilder.replaceArrays(RealDecl, Elements);
LexicalBlockStack.pop_back();
return RealDecl;
}
llvm::DIType CGDebugInfo::CreateType(const VectorType *Ty, llvm::DIFile Unit) {
llvm::DIType ElementTy = getOrCreateType(Ty->getElementType(), Unit);
int64_t Count = Ty->getNumElements();
if (Count == 0)
// If number of elements are not known then this is an unbounded array.
// Use Count == -1 to express such arrays.
Count = -1;
llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(0, Count);
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;
if (Ty->getElementType()->isIncompleteType())
Align = 0;
else
Align = CGM.getContext().getTypeAlign(Ty->getElementType());
} else if (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::Metadata *, 8> Subscripts;
QualType EltTy(Ty, 0);
while ((Ty = dyn_cast<ArrayType>(EltTy))) {
// If the number of elements is known, then count is that number. Otherwise,
// it's -1. This allows us to represent a subrange with an array of 0
// elements, like this:
//
// struct foo {
// int x[0];
// };
int64_t Count = -1; // Count == -1 is an unbounded array.
if (const ConstantArrayType *CAT = dyn_cast<ConstantArrayType>(Ty))
Count = CAT->getSize().getZExtValue();
// FIXME: Verify this is right for VLAs.
Subscripts.push_back(DBuilder.getOrCreateSubrange(0, Count));
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) {
llvm::DIType ClassType = getOrCreateType(QualType(Ty->getClass(), 0), U);
if (!Ty->getPointeeType()->isFunctionType())
return DBuilder.createMemberPointerType(
getOrCreateType(Ty->getPointeeType(), U), ClassType,
CGM.getContext().getTypeSize(Ty));
const FunctionProtoType *FPT =
Ty->getPointeeType()->getAs<FunctionProtoType>();
return DBuilder.createMemberPointerType(
getOrCreateInstanceMethodType(CGM.getContext().getPointerType(QualType(
Ty->getClass(), FPT->getTypeQuals())),
FPT, U),
ClassType, CGM.getContext().getTypeSize(Ty));
}
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 EnumType *Ty) {
const EnumDecl *ED = Ty->getDecl();
uint64_t Size = 0;
uint64_t Align = 0;
if (!ED->getTypeForDecl()->isIncompleteType()) {
Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
}
SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
// If this is just a forward declaration, construct an appropriately
// marked node and just return it.
if (!ED->getDefinition()) {
llvm::DIDescriptor EDContext;
EDContext = getContextDescriptor(cast<Decl>(ED->getDeclContext()));
llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
unsigned Line = getLineNumber(ED->getLocation());
StringRef EDName = ED->getName();
llvm::DIType RetTy = DBuilder.createReplaceableForwardDecl(
llvm::dwarf::DW_TAG_enumeration_type, EDName, EDContext, DefUnit, Line,
0, Size, Align, FullName);
ReplaceMap.emplace_back(
std::piecewise_construct, std::make_tuple(Ty),
std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
return RetTy;
}
return CreateTypeDefinition(Ty);
}
llvm::DIType CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
const EnumDecl *ED = Ty->getDecl();
uint64_t Size = 0;
uint64_t Align = 0;
if (!ED->getTypeForDecl()->isIncompleteType()) {
Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
}
SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
// Create DIEnumerator elements for each enumerator.
SmallVector<llvm::Metadata *, 16> Enumerators;
ED = ED->getDefinition();
for (const auto *Enum : ED->enumerators()) {
Enumerators.push_back(DBuilder.createEnumerator(
Enum->getName(), Enum->getInitVal().getSExtValue()));
}
// Return a CompositeType for the enum itself.
llvm::DIArray EltArray = DBuilder.getOrCreateArray(Enumerators);
llvm::DIFile DefUnit = getOrCreateFile(ED->getLocation());
unsigned Line = getLineNumber(ED->getLocation());
llvm::DIDescriptor EnumContext =
getContextDescriptor(cast<Decl>(ED->getDeclContext()));
llvm::DIType ClassTy = ED->isFixed()
? getOrCreateType(ED->getIntegerType(), DefUnit)
: llvm::DIType();
llvm::DIType DbgTy =
DBuilder.createEnumerationType(EnumContext, ED->getName(), DefUnit, Line,
Size, Align, EltArray, ClassTy, FullName);
return DbgTy;
}
static QualType UnwrapTypeForDebugInfo(QualType T, const ASTContext &C) {
Qualifiers Quals;
do {
Qualifiers InnerQuals = T.getLocalQualifiers();
// Qualifiers::operator+() doesn't like it if you add a Qualifier
// that is already there.
Quals += Qualifiers::removeCommonQualifiers(Quals, InnerQuals);
Quals += InnerQuals;
QualType LastT = T;
switch (T->getTypeClass()) {
default:
return C.getQualifiedType(T.getTypePtr(), Quals);
case Type::TemplateSpecialization: {
const auto *Spec = cast<TemplateSpecializationType>(T);
if (Spec->isTypeAlias())
return C.getQualifiedType(T.getTypePtr(), Quals);
T = Spec->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:
QualType DT = cast<AutoType>(T)->getDeducedType();
assert(!DT.isNull() && "Undeduced types shouldn't reach here.");
T = DT;
break;
}
assert(T != LastT && "Type unwrapping failed to unwrap!");
(void)LastT;
} while (true);
}
/// getType - Get the type from the cache or return null type if it doesn't
/// exist.
llvm::DIType CGDebugInfo::getTypeOrNull(QualType Ty) {
// Unwrap the type as needed for debug information.
Ty = UnwrapTypeForDebugInfo(Ty, CGM.getContext());
auto it = TypeCache.find(Ty.getAsOpaquePtr());
if (it != TypeCache.end()) {
// Verify that the debug info still exists.
if (llvm::Metadata *V = it->second)
return llvm::DIType(cast<llvm::MDNode>(V));
}
return llvm::DIType();
}
void CGDebugInfo::completeTemplateDefinition(
const ClassTemplateSpecializationDecl &SD) {
if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
return;
completeClassData(&SD);
// In case this type has no member function definitions being emitted, ensure
// it is retained
RetainedTypes.push_back(CGM.getContext().getRecordType(&SD).getAsOpaquePtr());
}
/// 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, CGM.getContext());
if (llvm::DIType T = getTypeOrNull(Ty))
return T;
// Otherwise create the type.
llvm::DIType Res = CreateTypeNode(Ty, Unit);
void *TyPtr = Ty.getAsOpaquePtr();
// And update the type cache.
TypeCache[TyPtr].reset(Res);
return Res;
}
/// Currently the checksum of an interface includes the number of
/// ivars and property accessors.
unsigned CGDebugInfo::Checksum(const ObjCInterfaceDecl *ID) {
// The assumption is that the number of ivars can only increase
// monotonically, so it is safe to just use their current number as
// a checksum.
unsigned Sum = 0;
for (const ObjCIvarDecl *Ivar = ID->all_declared_ivar_begin();
Ivar != nullptr; Ivar = Ivar->getNextIvar())
++Sum;
return Sum;
}
ObjCInterfaceDecl *CGDebugInfo::getObjCInterfaceDecl(QualType Ty) {
switch (Ty->getTypeClass()) {
case Type::ObjCObjectPointer:
return getObjCInterfaceDecl(
cast<ObjCObjectPointerType>(Ty)->getPointeeType());
case Type::ObjCInterface:
return cast<ObjCInterfaceType>(Ty)->getDecl();
default:
return nullptr;
}
}
/// 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);
// 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::Adjusted:
case Type::Decayed:
// Decayed and adjusted types use the adjusted type in LLVM and DWARF.
return CreateType(
cast<PointerType>(cast<AdjustedType>(Ty)->getAdjustedType()), 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));
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::TemplateSpecialization:
return CreateType(cast<TemplateSpecializationType>(Ty), Unit);
case Type::Auto:
case Type::Attributed:
case Type::Elaborated:
case Type::Paren:
case Type::SubstTemplateTypeParm:
case Type::TypeOfExpr:
case Type::TypeOf:
case Type::Decltype:
case Type::UnaryTransform:
case Type::PackExpansion:
break;
}
llvm_unreachable("type should have been unwrapped!");
}
/// getOrCreateLimitedType - Get the type from the cache or create a new
/// limited type if necessary.
llvm::DIType CGDebugInfo::getOrCreateLimitedType(const RecordType *Ty,
llvm::DIFile Unit) {
QualType QTy(Ty, 0);
llvm::DICompositeType T(getTypeOrNull(QTy));
// We may have cached a forward decl when we could have created
// a non-forward decl. Go ahead and create a non-forward decl
// now.
if (T && !T.isForwardDecl())
return T;
// Otherwise create the type.
llvm::DICompositeType Res = CreateLimitedType(Ty);
// Propagate members from the declaration to the definition
// CreateType(const RecordType*) will overwrite this with the members in the
// correct order if the full type is needed.
DBuilder.replaceArrays(Res, T.getElements());
// And update the type cache.
TypeCache[QTy.getAsOpaquePtr()].reset(Res);
return Res;
}
// TODO: Currently used for context chains when limiting debug info.
llvm::DICompositeType CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
RecordDecl *RD = Ty->getDecl();
// Get overall information about the record type for the debug info.
llvm::DIFile DefUnit = getOrCreateFile(RD->getLocation());
unsigned Line = getLineNumber(RD->getLocation());
StringRef RDName = getClassName(RD);
llvm::DIDescriptor RDContext =
getContextDescriptor(cast<Decl>(RD->getDeclContext()));
// If we ended up creating the type during the context chain construction,
// just return that.
llvm::DICompositeType T(getTypeOrNull(CGM.getContext().getRecordType(RD)));
if (T && (!T.isForwardDecl() || !RD->getDefinition()))
return T;
// If this is just a forward or incomplete declaration, construct an
// appropriately marked node and just return it.
const RecordDecl *D = RD->getDefinition();
if (!D || !D->isCompleteDefinition())
return getOrCreateRecordFwdDecl(Ty, RDContext);
uint64_t Size = CGM.getContext().getTypeSize(Ty);
uint64_t Align = CGM.getContext().getTypeAlign(Ty);
llvm::DICompositeType RealDecl;
SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
if (RD->isUnion())
RealDecl = DBuilder.createUnionType(RDContext, RDName, DefUnit, Line, Size,
Align, 0, llvm::DIArray(), 0, FullName);
else if (RD->isClass()) {
// FIXME: This could be a struct type giving a default visibility different
// than C++ class type, but needs llvm metadata changes first.
RealDecl = DBuilder.createClassType(
RDContext, RDName, DefUnit, Line, Size, Align, 0, 0, llvm::DIType(),
llvm::DIArray(), llvm::DIType(), llvm::DIArray(), FullName);
} else
RealDecl = DBuilder.createStructType(
RDContext, RDName, DefUnit, Line, Size, Align, 0, llvm::DIType(),
llvm::DIArray(), 0, llvm::DIType(), FullName);
RegionMap[Ty->getDecl()].reset(RealDecl);
TypeCache[QualType(Ty, 0).getAsOpaquePtr()].reset(RealDecl);
if (const ClassTemplateSpecializationDecl *TSpecial =
dyn_cast<ClassTemplateSpecializationDecl>(RD))
DBuilder.replaceArrays(RealDecl, llvm::DIArray(),
CollectCXXTemplateParams(TSpecial, DefUnit));
return RealDecl;
}
void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
llvm::DICompositeType RealDecl) {
// A class's primary base or the class itself contains the vtable.
llvm::DICompositeType ContainingType;
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 = llvm::DICompositeType(
getOrCreateType(QualType(PBase->getTypeForDecl(), 0),
getOrCreateFile(RD->getLocation())));
} else if (RD->isDynamicClass())
ContainingType = RealDecl;
DBuilder.replaceVTableHolder(RealDecl, ContainingType);
}
/// 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;
}
void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD,
llvm::DIFile Unit,
StringRef &Name, StringRef &LinkageName,
llvm::DIDescriptor &FDContext,
llvm::DIArray &TParamsArray,
unsigned &Flags) {
const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
Name = getFunctionName(FD);
// Use mangled name as linkage name for C/C++ functions.
if (FD->hasPrototype()) {
LinkageName = CGM.getMangledName(GD);
Flags |= llvm::DIDescriptor::FlagPrototyped;
}
// No need to replicate the linkage name if it isn't different from the
// subprogram name, no need to have it at all unless coverage is enabled or
// debug is set to more than just line tables.
if (LinkageName == Name ||
(!CGM.getCodeGenOpts().EmitGcovArcs &&
!CGM.getCodeGenOpts().EmitGcovNotes &&
DebugKind <= CodeGenOptions::DebugLineTablesOnly))
LinkageName = StringRef();
if (DebugKind >= CodeGenOptions::LimitedDebugInfo) {
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));
// Collect template parameters.
TParamsArray = CollectFunctionTemplateParams(FD, Unit);
}
}
void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile &Unit,
unsigned &LineNo, QualType &T,
StringRef &Name, StringRef &LinkageName,
llvm::DIDescriptor &VDContext) {
Unit = getOrCreateFile(VD->getLocation());
LineNo = getLineNumber(VD->getLocation());
setLocation(VD->getLocation());
T = VD->getType();
if (T->isIncompleteArrayType()) {
// CodeGen turns int[] into int[1] so we'll do the same here.
llvm::APInt ConstVal(32, 1);
QualType ET = CGM.getContext().getAsArrayType(T)->getElementType();
T = CGM.getContext().getConstantArrayType(ET, ConstVal,
ArrayType::Normal, 0);
}
Name = VD->getName();
if (VD->getDeclContext() && !isa<FunctionDecl>(VD->getDeclContext()) &&
!isa<ObjCMethodDecl>(VD->getDeclContext()))
LinkageName = CGM.getMangledName(VD);
if (LinkageName == Name)
LinkageName = StringRef();
// Since we emit declarations (DW_AT_members) for static members, place the
// definition of those static members in the namespace they were declared in
// in the source code (the lexical decl context).
// FIXME: Generalize this for even non-member global variables where the
// declaration and definition may have different lexical decl contexts, once
// we have support for emitting declarations of (non-member) global variables.
VDContext = getContextDescriptor(
dyn_cast<Decl>(VD->isStaticDataMember() ? VD->getLexicalDeclContext()
: VD->getDeclContext()));
}
llvm::DISubprogram
CGDebugInfo::getFunctionForwardDeclaration(const FunctionDecl *FD) {
llvm::DIArray TParamsArray;
StringRef Name, LinkageName;
unsigned Flags = 0;
SourceLocation Loc = FD->getLocation();
llvm::DIFile Unit = getOrCreateFile(Loc);
llvm::DIDescriptor DContext(Unit);
unsigned Line = getLineNumber(Loc);
collectFunctionDeclProps(FD, Unit, Name, LinkageName, DContext,
TParamsArray, Flags);
// Build function type.
SmallVector<QualType, 16> ArgTypes;
for (const ParmVarDecl *Parm: FD->parameters())
ArgTypes.push_back(Parm->getType());
QualType FnType =
CGM.getContext().getFunctionType(FD->getReturnType(), ArgTypes,
FunctionProtoType::ExtProtoInfo());
llvm::DISubprogram SP =
DBuilder.createTempFunctionFwdDecl(DContext, Name, LinkageName, Unit, Line,
getOrCreateFunctionType(FD, FnType, Unit),
!FD->isExternallyVisible(),
false /*declaration*/, 0, Flags,
CGM.getLangOpts().Optimize, nullptr,
TParamsArray, getFunctionDeclaration(FD));
const FunctionDecl *CanonDecl = cast<FunctionDecl>(FD->getCanonicalDecl());
FwdDeclReplaceMap.emplace_back(
std::piecewise_construct, std::make_tuple(CanonDecl),
std::make_tuple(static_cast<llvm::Metadata *>(SP)));
return SP;
}
llvm::DIGlobalVariable
CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
QualType T;
StringRef Name, LinkageName;
SourceLocation Loc = VD->getLocation();
llvm::DIFile Unit = getOrCreateFile(Loc);
llvm::DIDescriptor DContext(Unit);
unsigned Line = getLineNumber(Loc);
collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, DContext);
llvm::DIGlobalVariable GV =
DBuilder.createTempGlobalVariableFwdDecl(DContext, Name, LinkageName, Unit,
Line, getOrCreateType(T, Unit),
!VD->isExternallyVisible(),
nullptr, nullptr);
FwdDeclReplaceMap.emplace_back(
std::piecewise_construct,
std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
std::make_tuple(static_cast<llvm::Metadata *>(GV)));
return GV;
}
llvm::DIDescriptor CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
// We only need a declaration (not a definition) of the type - so use whatever
// we would otherwise do to get a type for a pointee. (forward declarations in
// limited debug info, full definitions (if the type definition is available)
// in unlimited debug info)
if (const TypeDecl *TD = dyn_cast<TypeDecl>(D))
return getOrCreateType(CGM.getContext().getTypeDeclType(TD),
getOrCreateFile(TD->getLocation()));
auto I = DeclCache.find(D->getCanonicalDecl());
if (I != DeclCache.end())
return llvm::DIDescriptor(dyn_cast_or_null<llvm::MDNode>(I->second));
// No definition for now. Emit a forward definition that might be
// merged with a potential upcoming definition.
if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D))
return getFunctionForwardDeclaration(FD);
else if (const auto *VD = dyn_cast<VarDecl>(D))
return getGlobalVariableForwardDeclaration(VD);
return llvm::DIDescriptor();
}
/// getFunctionDeclaration - Return debug info descriptor to describe method
/// declaration for the given method definition.
llvm::DISubprogram CGDebugInfo::getFunctionDeclaration(const Decl *D) {
if (!D || DebugKind <= CodeGenOptions::DebugLineTablesOnly)
return llvm::DISubprogram();
const FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
if (!FD)
return llvm::DISubprogram();
// Setup context.
llvm::DIScope S = getContextDescriptor(cast<Decl>(D->getDeclContext()));
auto MI = SPCache.find(FD->getCanonicalDecl());
if (MI == SPCache.end()) {
if (const CXXMethodDecl *MD =
dyn_cast<CXXMethodDecl>(FD->getCanonicalDecl())) {
llvm::DICompositeType T(S);
llvm::DISubprogram SP =
CreateCXXMemberFunction(MD, getOrCreateFile(MD->getLocation()), T);
return SP;
}
}
if (MI != SPCache.end()) {
llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(MI->second));
if (SP.isSubprogram() && !SP.isDefinition())
return SP;
}
for (auto NextFD : FD->redecls()) {
auto MI = SPCache.find(NextFD->getCanonicalDecl());
if (MI != SPCache.end()) {
llvm::DISubprogram SP(dyn_cast_or_null<llvm::MDNode>(MI->second));
if (SP.isSubprogram() && !SP.isDefinition())
return SP;
}
}
return llvm::DISubprogram();
}
// getOrCreateFunctionType - Construct DIType. If it is a c++ method, include
// implicit parameter "this".
llvm::DICompositeType CGDebugInfo::getOrCreateFunctionType(const Decl *D,
QualType FnType,
llvm::DIFile F) {
if (!D || DebugKind <= CodeGenOptions::DebugLineTablesOnly)
// Create fake but valid subroutine type. Otherwise
// llvm::DISubprogram::Verify() would return false, and
// subprogram DIE will miss DW_AT_decl_file and
// DW_AT_decl_line fields.
return DBuilder.createSubroutineType(F,
DBuilder.getOrCreateTypeArray(None));
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::Metadata *, 16> Elts;
// First element is always return type. For 'void' functions it is NULL.
QualType ResultTy = OMethod->getReturnType();
// Replace the instancetype keyword with the actual type.
if (ResultTy == CGM.getContext().getObjCInstanceType())
ResultTy = CGM.getContext().getPointerType(
QualType(OMethod->getClassInterface()->getTypeForDecl(), 0));
Elts.push_back(getOrCreateType(ResultTy, F));
// "self" pointer is always first argument.
QualType SelfDeclTy = OMethod->getSelfDecl()->getType();
llvm::DIType SelfTy = getOrCreateType(SelfDeclTy, F);
Elts.push_back(CreateSelfType(SelfDeclTy, SelfTy));
// "_cmd" pointer is always second argument.
llvm::DIType CmdTy = getOrCreateType(OMethod->getCmdDecl()->getType(), F);
Elts.push_back(DBuilder.createArtificialType(CmdTy));
// Get rest of the arguments.
for (const auto *PI : OMethod->params())
Elts.push_back(getOrCreateType(PI->getType(), F));
// Variadic methods need a special marker at the end of the type list.
if (OMethod->isVariadic())
Elts.push_back(DBuilder.createUnspecifiedParameter());
llvm::DITypeArray EltTypeArray = DBuilder.getOrCreateTypeArray(Elts);
return DBuilder.createSubroutineType(F, EltTypeArray);
}
// Handle variadic function types; they need an additional
// unspecified parameter.
if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
if (FD->isVariadic()) {
SmallVector<llvm::Metadata *, 16> EltTys;
EltTys.push_back(getOrCreateType(FD->getReturnType(), F));
if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(FnType))
for (unsigned i = 0, e = FPT->getNumParams(); i != e; ++i)
EltTys.push_back(getOrCreateType(FPT->getParamType(i), F));
EltTys.push_back(DBuilder.createUnspecifiedParameter());
llvm::DITypeArray EltTypeArray = DBuilder.getOrCreateTypeArray(EltTys);
return DBuilder.createSubroutineType(F, EltTypeArray);
}
return llvm::DICompositeType(getOrCreateType(FnType, F));
}
/// EmitFunctionStart - Constructs the debug code for entering a function.
void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, SourceLocation Loc,
SourceLocation ScopeLoc, QualType FnType,
llvm::Function *Fn, CGBuilderTy &Builder) {
StringRef Name;
StringRef LinkageName;
FnBeginRegionCount.push_back(LexicalBlockStack.size());
const Decl *D = GD.getDecl();
bool HasDecl = (D != nullptr);
unsigned Flags = 0;
llvm::DIFile Unit = getOrCreateFile(Loc);
llvm::DIDescriptor FDContext(Unit);
llvm::DIArray TParamsArray;
if (!HasDecl) {
// Use llvm function name.
LinkageName = Fn->getName();
} else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
// If there is a DISubprogram for this function available then use it.
auto FI = SPCache.find(FD->getCanonicalDecl());
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.emplace_back(SPN);
RegionMap[D].reset(SP);
return;
}
}
collectFunctionDeclProps(GD, Unit, Name, LinkageName, FDContext,
TParamsArray, Flags);
} 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);
if (!HasDecl || D->isImplicit()) {
Flags |= llvm::DIDescriptor::FlagArtificial;
// Artificial functions without a location should not silently reuse CurLoc.
if (Loc.isInvalid())
CurLoc = SourceLocation();
}
unsigned LineNo = getLineNumber(Loc);
unsigned ScopeLine = getLineNumber(ScopeLoc);
// FIXME: The function declaration we're constructing here is mostly reusing
// declarations from CXXMethodDecl and not constructing new ones for arbitrary
// FunctionDecls. When/if we fix this we can have FDContext be TheCU/null for
// all subprograms instead of the actual context since subprogram definitions
// are emitted as CU level entities by the backend.
llvm::DISubprogram SP = DBuilder.createFunction(
FDContext, Name, LinkageName, Unit, LineNo,
getOrCreateFunctionType(D, FnType, Unit), Fn->hasInternalLinkage(),
true /*definition*/, ScopeLine, Flags, CGM.getLangOpts().Optimize, Fn,
TParamsArray, getFunctionDeclaration(D));
// We might get here with a VarDecl in the case we're generating
// code for the initialization of globals. Do not record these decls
// as they will overwrite the actual VarDecl Decl in the cache.
if (HasDecl && isa<FunctionDecl>(D))
DeclCache[D->getCanonicalDecl()].reset(static_cast<llvm::Metadata *>(SP));
// Push the function onto the lexical block stack.
llvm::MDNode *SPN = SP;
LexicalBlockStack.emplace_back(SPN);
if (HasDecl)
RegionMap[D].reset(SP);
}
/// EmitLocation - Emit metadata to indicate a change in line/column
/// information in the source file. If the location is invalid, the
/// previous location will be reused.
void CGDebugInfo::EmitLocation(CGBuilderTy &Builder, SourceLocation Loc) {
// Update our current location
setLocation(Loc);
if (CurLoc.isInvalid() || CurLoc.isMacroID())
return;
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::MDNode *Back = nullptr;
if (!LexicalBlockStack.empty())
Back = LexicalBlockStack.back().get();
llvm::DIDescriptor D = DBuilder.createLexicalBlock(
llvm::DIDescriptor(Back), getOrCreateFile(CurLoc), getLineNumber(CurLoc),
getColumnNumber(CurLoc));
llvm::MDNode *DN = D;
LexicalBlockStack.emplace_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);
// Emit a line table change for the current location inside the new scope.
Builder.SetCurrentDebugLocation(llvm::DebugLoc::get(
getLineNumber(Loc), getColumnNumber(Loc), LexicalBlockStack.back()));
if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
return;
// Create a new lexical block and push it on the stack.
CreateLexicalBlock(Loc);
}
/// 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);
if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
return;
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) {
// Provide an entry in the line table for the end of the block.
EmitLocation(Builder, CurLoc);
LexicalBlockStack.pop_back();
}
FnBeginRegionCount.pop_back();
}
// EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
// See BuildByRefType.
llvm::DIType CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
uint64_t *XOffset) {
SmallVector<llvm::Metadata *, 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, VD);
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));
}
bool HasByrefExtendedLayout;
Qualifiers::ObjCLifetime Lifetime;
if (CGM.getContext().getByrefLifetime(Type, Lifetime,
HasByrefExtendedLayout) &&
HasByrefExtendedLayout) {
FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
EltTys.push_back(
CreateMemberType(Unit, FType, "__byref_variable_layout", &FieldOffset));
}
CharUnits Align = CGM.getContext().getDeclAlign(VD);
if (Align > CGM.getContext().toCharUnitsFromBits(
CGM.getTarget().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 = 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,
llvm::DIType(), Elements);
}
/// EmitDeclare - Emit local variable declaration debug info.
void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::dwarf::LLVMConstants Tag,
llvm::Value *Storage, unsigned ArgNo,
CGBuilderTy &Builder) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
bool Unwritten =
VD->isImplicit() || (isa<Decl>(VD->getDeclContext()) &&
cast<Decl>(VD->getDeclContext())->isImplicit());
llvm::DIFile Unit;
if (!Unwritten)
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 no debug info for this type then do not emit debug info
// for this variable.
if (!Ty)
return;
// Get location information.
unsigned Line = 0;
unsigned Column = 0;
if (!Unwritten) {
Line = getLineNumber(VD->getLocation());
Column = getColumnNumber(VD->getLocation());
}
SmallVector<int64_t, 9> Expr;
unsigned Flags = 0;
if (VD->isImplicit())
Flags |= llvm::DIDescriptor::FlagArtificial;
// If this is the first argument and it is implicit then
// give it an object pointer flag.
// FIXME: There has to be a better way to do this, but for static
// functions there won't be an implicit param at arg1 and
// otherwise it is 'self' or 'this'.
if (isa<ImplicitParamDecl>(VD) && ArgNo == 1)
Flags |= llvm::DIDescriptor::FlagObjectPointer;
if (llvm::Argument *Arg = dyn_cast<llvm::Argument>(Storage))
if (Arg->getType()->isPointerTy() && !Arg->hasByValAttr() &&
!VD->getType()->isPointerType())
Expr.push_back(llvm::dwarf::DW_OP_deref);
llvm::MDNode *Scope = LexicalBlockStack.back();
StringRef Name = VD->getName();
if (!Name.empty()) {
if (VD->hasAttr<BlocksAttr>()) {
CharUnits offset = CharUnits::fromQuantity(32);
Expr.push_back(llvm::dwarf::DW_OP_plus);
// offset of __forwarding field
offset = CGM.getContext().toCharUnitsFromBits(
CGM.getTarget().getPointerWidth(0));
Expr.push_back(offset.getQuantity());
Expr.push_back(llvm::dwarf::DW_OP_deref);
Expr.push_back(llvm::dwarf::DW_OP_plus);
// offset of x field
offset = CGM.getContext().toCharUnitsFromBits(XOffset);
Expr.push_back(offset.getQuantity());
// Create the descriptor for the variable.
llvm::DIVariable D = DBuilder.createLocalVariable(
Tag, llvm::DIDescriptor(Scope), VD->getName(), Unit, Line, Ty, ArgNo);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call =
DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
Builder.GetInsertBlock());
Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
return;
} else if (isa<VariableArrayType>(VD->getType()))
Expr.push_back(llvm::dwarf::DW_OP_deref);
} else if (const RecordType *RT = dyn_cast<RecordType>(VD->getType())) {
// If VD is an anonymous union then Storage represents value for
// all union fields.
const RecordDecl *RD = cast<RecordDecl>(RT->getDecl());
if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
for (const auto *Field : RD->fields()) {
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.getLangOpts().Optimize, Flags, ArgNo);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call = DBuilder.insertDeclare(
Storage, D, DBuilder.createExpression(Expr),
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.getLangOpts().Optimize, Flags, ArgNo);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call = DBuilder.insertDeclare(
Storage, D, DBuilder.createExpression(Expr), Builder.GetInsertBlock());
Call->setDebugLoc(llvm::DebugLoc::get(Line, Column, Scope));
}
void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
llvm::Value *Storage,
CGBuilderTy &Builder) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
EmitDeclare(VD, llvm::dwarf::DW_TAG_auto_variable, Storage, 0, Builder);
}
/// Look up the completed type for a self pointer in the TypeCache and
/// create a copy of it with the ObjectPointer and Artificial flags
/// set. If the type is not cached, a new one is created. This should
/// never happen though, since creating a type for the implicit self
/// argument implies that we already parsed the interface definition
/// and the ivar declarations in the implementation.
llvm::DIType CGDebugInfo::CreateSelfType(const QualType &QualTy,
llvm::DIType Ty) {
llvm::DIType CachedTy = getTypeOrNull(QualTy);
if (CachedTy)
Ty = CachedTy;
return DBuilder.createObjectPointerType(Ty);
}
void CGDebugInfo::EmitDeclareOfBlockDeclRefVariable(
const VarDecl *VD, llvm::Value *Storage, CGBuilderTy &Builder,
const CGBlockInfo &blockInfo, llvm::Instruction *InsertPoint) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
if (Builder.GetInsertBlock() == nullptr)
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);
// Self is passed along as an implicit non-arg variable in a
// block. Mark it as the object pointer.
if (isa<ImplicitParamDecl>(VD) && VD->getName() == "self")
Ty = CreateSelfType(VD->getType(), Ty);
// Get location information.
unsigned Line = getLineNumber(VD->getLocation());
unsigned Column = getColumnNumber(VD->getLocation());
const llvm::DataLayout &target = CGM.getDataLayout();
CharUnits offset = CharUnits::fromQuantity(
target.getStructLayout(blockInfo.StructureType)
->getElementOffset(blockInfo.getCapture(VD).getIndex()));
SmallVector<int64_t, 9> addr;
if (isa<llvm::AllocaInst>(Storage))
addr.push_back(llvm::dwarf::DW_OP_deref);
addr.push_back(llvm::dwarf::DW_OP_plus);
addr.push_back(offset.getQuantity());
if (isByRef) {
addr.push_back(llvm::dwarf::DW_OP_deref);
addr.push_back(llvm::dwarf::DW_OP_plus);
// offset of __forwarding field
offset =
CGM.getContext().toCharUnitsFromBits(target.getPointerSizeInBits(0));
addr.push_back(offset.getQuantity());
addr.push_back(llvm::dwarf::DW_OP_deref);
addr.push_back(llvm::dwarf::DW_OP_plus);
// offset of x field
offset = CGM.getContext().toCharUnitsFromBits(XOffset);
addr.push_back(offset.getQuantity());
}
// Create the descriptor for the variable.
llvm::DIVariable D =
DBuilder.createLocalVariable(llvm::dwarf::DW_TAG_auto_variable,
llvm::DIDescriptor(LexicalBlockStack.back()),
VD->getName(), Unit, Line, Ty);
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *Call = InsertPoint ?
DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr),
InsertPoint)
: DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr),
Builder.GetInsertBlock());
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) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
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 *Arg,
unsigned ArgNo,
llvm::Value *LocalAddr,
CGBuilderTy &Builder) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
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.getDataLayout().getStructLayout(block.StructureType);
SmallVector<llvm::Metadata *, 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));
auto *FnTy = block.getBlockExpr()->getFunctionType();
auto FnPtrType = CGM.getContext().getPointerType(FnTy->desugar());
fields.push_back(createFieldType("__FuncPtr", FnPtrType, 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 = nullptr;
chunks.push_back(chunk);
}
// Variable captures.
for (const auto &capture : blockDecl->captures()) {
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()) {
TypeInfo 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.Width);
fieldType =
DBuilder.createMemberType(tunit, name, tunit, line, PtrInfo.Width,
PtrInfo.Align, offsetInBits, 0, fieldType);
} else {
fieldType = createFieldType(name, variable->getType(), 0, loc, AS_public,
offsetInBits, tunit, tunit);
}
fields.push_back(fieldType);
}
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,
llvm::DIType(), fieldsArray);
type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
// Get overall information about the block.
unsigned flags = llvm::DIDescriptor::FlagArtificial;
llvm::MDNode *scope = LexicalBlockStack.back();
// Create the descriptor for the parameter.
llvm::DIVariable debugVar = DBuilder.createLocalVariable(
llvm::dwarf::DW_TAG_arg_variable, llvm::DIDescriptor(scope),
Arg->getName(), tunit, line, type, CGM.getLangOpts().Optimize, flags,
ArgNo);
if (LocalAddr) {
// Insert an llvm.dbg.value into the current block.
llvm::Instruction *DbgVal = DBuilder.insertDbgValueIntrinsic(
LocalAddr, 0, debugVar, DBuilder.createExpression(),
Builder.GetInsertBlock());
DbgVal->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
}
// Insert an llvm.dbg.declare into the current block.
llvm::Instruction *DbgDecl = DBuilder.insertDeclare(
Arg, debugVar, DBuilder.createExpression(), Builder.GetInsertBlock());
DbgDecl->setDebugLoc(llvm::DebugLoc::get(line, column, scope));
}
/// If D is an out-of-class definition of a static data member of a class, find
/// its corresponding in-class declaration.
llvm::DIDerivedType
CGDebugInfo::getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D) {
if (!D->isStaticDataMember())
return llvm::DIDerivedType();
auto MI = StaticDataMemberCache.find(D->getCanonicalDecl());
if (MI != StaticDataMemberCache.end()) {
assert(MI->second && "Static data member declaration should still exist");
return llvm::DIDerivedType(cast<llvm::MDNode>(MI->second));
}
// If the member wasn't found in the cache, lazily construct and add it to the
// type (used when a limited form of the type is emitted).
auto DC = D->getDeclContext();
llvm::DICompositeType Ctxt(getContextDescriptor(cast<Decl>(DC)));
return CreateRecordStaticField(D, Ctxt, cast<RecordDecl>(DC));
}
/// Recursively collect all of the member fields of a global anonymous decl and
/// create static variables for them. The first time this is called it needs
/// to be on a union and then from there we can have additional unnamed fields.
llvm::DIGlobalVariable
CGDebugInfo::CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile Unit,
unsigned LineNo, StringRef LinkageName,
llvm::GlobalVariable *Var,
llvm::DIDescriptor DContext) {
llvm::DIGlobalVariable GV;
for (const auto *Field : RD->fields()) {
llvm::DIType FieldTy = getOrCreateType(Field->getType(), Unit);
StringRef FieldName = Field->getName();
// Ignore unnamed fields, but recurse into anonymous records.
if (FieldName.empty()) {
const RecordType *RT = dyn_cast<RecordType>(Field->getType());
if (RT)
GV = CollectAnonRecordDecls(RT->getDecl(), Unit, LineNo, LinkageName,
Var, DContext);
continue;
}
// Use VarDecl's Tag, Scope and Line number.
GV = DBuilder.createGlobalVariable(
DContext, FieldName, LinkageName, Unit, LineNo, FieldTy,
Var->hasInternalLinkage(), Var, llvm::DIDerivedType());
}
return GV;
}
/// EmitGlobalVariable - Emit information about a global variable.
void CGDebugInfo::EmitGlobalVariable(llvm::GlobalVariable *Var,
const VarDecl *D) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
// Create global variable debug descriptor.
llvm::DIFile Unit;
llvm::DIDescriptor DContext;
unsigned LineNo;
StringRef DeclName, LinkageName;
QualType T;
collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName, DContext);
// Attempt to store one global variable for the declaration - even if we
// emit a lot of fields.
llvm::DIGlobalVariable GV;
// If this is an anonymous union then we'll want to emit a global
// variable for each member of the anonymous union so that it's possible
// to find the name of any field in the union.
if (T->isUnionType() && DeclName.empty()) {
const RecordDecl *RD = cast<RecordType>(T)->getDecl();
assert(RD->isAnonymousStructOrUnion() &&
"unnamed non-anonymous struct or union?");
GV = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
} else {
GV = DBuilder.createGlobalVariable(
DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
Var->hasInternalLinkage(), Var,
getOrCreateStaticDataMemberDeclarationOrNull(D));
}
DeclCache[D->getCanonicalDecl()].reset(static_cast<llvm::Metadata *>(GV));
}
/// EmitGlobalVariable - Emit global variable's debug info.
void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD,
llvm::Constant *Init) {
assert(DebugKind >= CodeGenOptions::LimitedDebugInfo);
// 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)) {
const EnumDecl *ED = cast<EnumDecl>(ECD->getDeclContext());
assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
}
// Do not use DIGlobalVariable for enums.
if (Ty.getTag() == llvm::dwarf::DW_TAG_enumeration_type)
return;
// Do not emit separate definitions for function local const/statics.
if (isa<FunctionDecl>(VD->getDeclContext()))
return;
VD = cast<ValueDecl>(VD->getCanonicalDecl());
auto *VarD = cast<VarDecl>(VD);
if (VarD->isStaticDataMember()) {
auto *RD = cast<RecordDecl>(VarD->getDeclContext());
getContextDescriptor(RD);
// Ensure that the type is retained even though it's otherwise unreferenced.
RetainedTypes.push_back(
CGM.getContext().getRecordType(RD).getAsOpaquePtr());
return;
}
llvm::DIDescriptor DContext =
getContextDescriptor(dyn_cast<Decl>(VD->getDeclContext()));
auto &GV = DeclCache[VD];
if (GV)
return;
GV.reset(DBuilder.createGlobalVariable(
DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
true, Init, getOrCreateStaticDataMemberDeclarationOrNull(VarD)));
}
llvm::DIScope CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
if (!LexicalBlockStack.empty())
return llvm::DIScope(LexicalBlockStack.back());
return getContextDescriptor(D);
}
void CGDebugInfo::EmitUsingDirective(const UsingDirectiveDecl &UD) {
if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
return;
DBuilder.createImportedModule(
getCurrentContextDescriptor(cast<Decl>(UD.getDeclContext())),
getOrCreateNameSpace(UD.getNominatedNamespace()),
getLineNumber(UD.getLocation()));
}
void CGDebugInfo::EmitUsingDecl(const UsingDecl &UD) {
if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
return;
assert(UD.shadow_size() &&
"We shouldn't be codegening an invalid UsingDecl containing no decls");
// Emitting one decl is sufficient - debuggers can detect that this is an
// overloaded name & provide lookup for all the overloads.
const UsingShadowDecl &USD = **UD.shadow_begin();
if (llvm::DIDescriptor Target =
getDeclarationOrDefinition(USD.getUnderlyingDecl()))
DBuilder.createImportedDeclaration(
getCurrentContextDescriptor(cast<Decl>(USD.getDeclContext())), Target,
getLineNumber(USD.getLocation()));
}
llvm::DIImportedEntity
CGDebugInfo::EmitNamespaceAlias(const NamespaceAliasDecl &NA) {
if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
return llvm::DIImportedEntity(nullptr);
auto &VH = NamespaceAliasCache[&NA];
if (VH)
return llvm::DIImportedEntity(cast<llvm::MDNode>(VH));
llvm::DIImportedEntity R(nullptr);
if (const NamespaceAliasDecl *Underlying =
dyn_cast<NamespaceAliasDecl>(NA.getAliasedNamespace()))
// This could cache & dedup here rather than relying on metadata deduping.
R = DBuilder.createImportedDeclaration(
getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
EmitNamespaceAlias(*Underlying), getLineNumber(NA.getLocation()),
NA.getName());
else
R = DBuilder.createImportedDeclaration(
getCurrentContextDescriptor(cast<Decl>(NA.getDeclContext())),
getOrCreateNameSpace(cast<NamespaceDecl>(NA.getAliasedNamespace())),
getLineNumber(NA.getLocation()), NA.getName());
VH.reset(R);
return R;
}
/// getOrCreateNamesSpace - Return namespace descriptor for the given
/// namespace decl.
llvm::DINameSpace
CGDebugInfo::getOrCreateNameSpace(const NamespaceDecl *NSDecl) {
NSDecl = NSDecl->getCanonicalDecl();
auto 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].reset(NS);
return NS;
}
void CGDebugInfo::finalize() {
// Creating types might create further types - invalidating the current
// element and the size(), so don't cache/reference them.
for (size_t i = 0; i != ObjCInterfaceCache.size(); ++i) {
ObjCInterfaceCacheEntry E = ObjCInterfaceCache[i];
E.Decl.replaceAllUsesWith(CGM.getLLVMContext(),
E.Type->getDecl()->getDefinition()
? CreateTypeDefinition(E.Type, E.Unit)
: E.Decl);
}
for (auto p : ReplaceMap) {
assert(p.second);
llvm::DIType Ty(cast<llvm::MDNode>(p.second));
assert(Ty.isForwardDecl());
auto it = TypeCache.find(p.first);
assert(it != TypeCache.end());
assert(it->second);
llvm::DIType RepTy(cast<llvm::MDNode>(it->second));
Ty.replaceAllUsesWith(CGM.getLLVMContext(), RepTy);
}
for (const auto &p : FwdDeclReplaceMap) {
assert(p.second);
llvm::DIDescriptor FwdDecl(cast<llvm::MDNode>(p.second));
llvm::Metadata *Repl;
auto it = DeclCache.find(p.first);
// If there has been no definition for the declaration, call RAUW
// with ourselves, that will destroy the temporary MDNode and
// replace it with a standard one, avoiding leaking memory.
if (it == DeclCache.end())
Repl = p.second;
else
Repl = it->second;
FwdDecl.replaceAllUsesWith(CGM.getLLVMContext(),
llvm::DIDescriptor(cast<llvm::MDNode>(Repl)));
}
// We keep our own list of retained types, because we need to look
// up the final type in the type cache.
for (std::vector<void *>::const_iterator RI = RetainedTypes.begin(),
RE = RetainedTypes.end(); RI != RE; ++RI)
DBuilder.retainType(llvm::DIType(cast<llvm::MDNode>(TypeCache[*RI])));
DBuilder.finalize();
}
void CGDebugInfo::EmitExplicitCastType(QualType Ty) {
if (CGM.getCodeGenOpts().getDebugInfo() < CodeGenOptions::LimitedDebugInfo)
return;
llvm::DIType DieTy = getOrCreateType(Ty, getOrCreateMainFile());
// Don't ignore in case of explicit cast where it is referenced indirectly.
DBuilder.retainType(DieTy);
}
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