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//===-- gen/dibuilder.h - Debug information builder -------------*- C++ -*-===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "gen/dibuilder.h"
#include "dmd/declaration.h"
#include "dmd/enum.h"
#include "dmd/errors.h"
#include "dmd/expression.h"
#include "dmd/identifier.h"
#include "dmd/import.h"
#include "dmd/mangle.h"
#include "dmd/module.h"
#include "dmd/mtype.h"
#include "dmd/nspace.h"
#include "dmd/root/dcompat.h"
#include "dmd/target.h"
#include "dmd/template.h"
#include "driver/cl_options.h"
#include "driver/ldc-version.h"
#include "gen/functions.h"
#include "gen/irstate.h"
#include "gen/llvmhelpers.h"
#include "gen/logger.h"
#include "gen/optimizer.h"
#include "gen/tollvm.h"
#include "ir/irfunction.h"
#include "ir/irfuncty.h"
#include "ir/irmodule.h"
#include "ir/irtypeaggr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include <functional>
////////////////////////////////////////////////////////////////////////////////
namespace cl = llvm::cl;
using LLMetadata = llvm::Metadata;
static cl::opt<cl::boolOrDefault> emitColumnInfo(
"gcolumn-info", cl::ZeroOrMore, cl::Hidden,
cl::desc("Include column numbers in line debug infos. Defaults to "
"true for non-MSVC targets."));
namespace ldc {
// in gen/cpp-imitating-naming.d
const char *convertDIdentifierToCPlusPlus(const char *name,
d_size_t nameLength);
namespace {
llvm::StringRef uniqueIdent(Type *t) {
if (t->deco)
return t->deco;
return llvm::StringRef();
}
const char *getTemplateInstanceName(TemplateInstance *ti) {
const auto realParent = ti->parent;
ti->parent = nullptr;
const auto name = ti->toPrettyChars(true);
ti->parent = realParent;
return name;
}
llvm::StringRef processDIName(llvm::StringRef name) {
return global.params.symdebug == 2
? convertDIdentifierToCPlusPlus(name.data(), name.size())
: name;
}
} // namespace
bool DIBuilder::mustEmitFullDebugInfo() {
// only for -g and -gc
// TODO: but not dcompute (yet)
if (IR->dcomputetarget)
return false;
return global.params.symdebug == 1 || global.params.symdebug == 2;
}
bool DIBuilder::mustEmitLocationsDebugInfo() {
// for -g -gc and -gline-tables-only
// TODO:but not dcompute (yet)
if (IR->dcomputetarget)
return false;
return (global.params.symdebug > 0) || global.params.outputSourceLocations;
}
////////////////////////////////////////////////////////////////////////////////
DIBuilder::DIBuilder(IRState *const IR)
: IR(IR), DBuilder(IR->module), CUNode(nullptr),
emitCodeView(!opts::emitDwarfDebugInfo &&
global.params.targetTriple->isWindowsMSVCEnvironment()),
// like clang, don't emit any column infos for CodeView by default
// (https://reviews.llvm.org/D23720)
emitColumnInfo(opts::getFlagOrDefault(::emitColumnInfo, !emitCodeView)) {}
unsigned DIBuilder::getColumn(const Loc &loc) const {
return (loc.linnum && emitColumnInfo) ? loc.charnum : 0;
}
// Returns the DI scope of a symbol.
DIScope DIBuilder::GetSymbolScope(Dsymbol *s) {
// don't recreate parent entries if we only need location debug info
if (!mustEmitFullDebugInfo())
return GetCU();
auto parent = s->toParent();
auto vd = s->isVarDeclaration();
if (vd && vd->isDataseg()) {
// static variables get attached to the module scope, but their
// parent composite types have to get declared
while (!parent->isModule()) {
if (parent->isAggregateDeclaration())
CreateCompositeType(parent->getType());
parent = parent->toParent();
}
}
if (auto ti = parent->isTemplateInstance()) {
return EmitNamespace(ti, getTemplateInstanceName(ti));
} else if (auto m = parent->isModule()) {
return EmitModule(m);
} else if (parent->isAggregateDeclaration()) {
return CreateCompositeType(parent->getType());
} else if (auto fd = parent->isFuncDeclaration()) {
DtoDeclareFunction(fd);
return EmitSubProgram(fd);
} else if (auto ns = parent->isNspace()) {
return EmitNamespace(ns, ns->toChars());
} else if (auto fwd = parent->isForwardingScopeDsymbol()) {
return GetSymbolScope(fwd);
} else if (auto ed = parent->isEnumDeclaration()) {
auto et = CreateEnumType(ed->getType()->isTypeEnum());
if (llvm::isa<llvm::DICompositeType>(et))
return et;
return EmitNamespace(ed, ed->toChars());
} else {
error(parent->loc, "unknown debuginfo scope `%s`; please file an LDC issue",
parent->toChars());
fatal();
}
}
DIScope DIBuilder::GetCurrentScope() {
if (IR->funcGenStates.empty())
return getIrModule(IR->dmodule)->diModule;
IrFunction *fn = IR->func();
if (fn->diLexicalBlocks.empty()) {
assert(static_cast<llvm::MDNode *>(fn->diSubprogram) != 0);
return fn->diSubprogram;
}
return fn->diLexicalBlocks.top();
}
// Usually just returns the regular name of the symbol and sets the scope
// representing its parent.
// As a special case, it handles `TemplatedSymbol!(...).TemplatedSymbol`,
// returning `TemplatedSymbol!(...)` as name and the scope of the
// TemplateInstance instead.
llvm::StringRef DIBuilder::GetNameAndScope(Dsymbol *sym, DIScope &scope) {
llvm::StringRef name;
scope = nullptr;
if (auto ti = sym->parent->isTemplateInstance()) {
if (ti->aliasdecl == sym) {
name = getTemplateInstanceName(ti);
scope = GetSymbolScope(ti);
}
}
// normal case
if (!scope) {
name = sym->toChars();
scope = GetSymbolScope(sym);
}
return processDIName(name);
}
// Sets the memory address for a debuginfo variable.
void DIBuilder::Declare(const Loc &loc, llvm::Value *storage,
DILocalVariable divar, DIExpression diexpr) {
auto debugLoc = llvm::DILocation::get(IR->context(), loc.linnum,
getColumn(loc), GetCurrentScope());
DBuilder.insertDeclare(storage, divar, diexpr, debugLoc, IR->scopebb());
}
// Sets the (current) value for a debuginfo variable.
void DIBuilder::SetValue(const Loc &loc, llvm::Value *value,
DILocalVariable divar, DIExpression diexpr) {
auto debugLoc = llvm::DILocation::get(IR->context(), loc.linnum,
getColumn(loc), GetCurrentScope());
DBuilder.insertDbgValueIntrinsic(value, divar, diexpr, debugLoc,
IR->scopebb());
}
DIFile DIBuilder::CreateFile(const char *filename) {
if (!filename)
filename = IR->dmodule->srcfile.toChars();
// clang appears to use the curent working dir as 'directory' for relative
// source paths, and the root path for absolute ones:
// clang -g -emit-llvm -S ..\blub.c =>
// !DIFile(filename: "..\\blub.c", directory: "C:\\LDC\\ninja-ldc", ...)
// !DIFile(filename: "Program
// Files\\LLVM\\lib\\clang\\11.0.1\\include\\stddef.h", directory: "C:\\",
// ...)
if (llvm::sys::path::is_absolute(filename)) {
return DBuilder.createFile(llvm::sys::path::relative_path(filename),
llvm::sys::path::root_path(filename));
}
llvm::SmallString<128> cwd;
llvm::sys::fs::current_path(cwd);
return DBuilder.createFile(filename, cwd);
}
DIFile DIBuilder::CreateFile(const Loc &loc) {
return CreateFile(loc.filename);
}
DIFile DIBuilder::CreateFile(Dsymbol *decl) {
const char *filename = nullptr;
for (Dsymbol *sym = decl; sym && !filename; sym = sym->parent)
filename = sym->loc.filename;
return CreateFile(filename);
}
DIType DIBuilder::CreateBasicType(Type *type) {
using namespace llvm::dwarf;
Type *t = type->toBasetype();
llvm::Type *T = DtoType(type);
// find encoding
unsigned Encoding;
switch (t->ty) {
case TY::Tbool:
Encoding = DW_ATE_boolean;
break;
case TY::Tchar:
if (emitCodeView) {
// VS debugger does not support DW_ATE_UTF for char
Encoding = DW_ATE_unsigned_char;
break;
}
// fall through
case TY::Twchar:
case TY::Tdchar:
Encoding = DW_ATE_UTF;
break;
case TY::Tint8:
if (emitCodeView) {
// VS debugger does not support DW_ATE_signed for 8-bit
Encoding = DW_ATE_signed_char;
break;
}
// fall through
case TY::Tint16:
case TY::Tint32:
case TY::Tint64:
case TY::Tint128:
Encoding = DW_ATE_signed;
break;
case TY::Tuns8:
if (emitCodeView) {
// VS debugger does not support DW_ATE_unsigned for 8-bit
Encoding = DW_ATE_unsigned_char;
break;
}
// fall through
case TY::Tuns16:
case TY::Tuns32:
case TY::Tuns64:
case TY::Tuns128:
Encoding = DW_ATE_unsigned;
break;
case TY::Tfloat32:
case TY::Tfloat64:
case TY::Tfloat80:
Encoding = DW_ATE_float;
break;
case TY::Timaginary32:
case TY::Timaginary64:
case TY::Timaginary80:
if (emitCodeView) {
// DW_ATE_imaginary_float not supported by the LLVM DWARF->CodeView
// conversion
Encoding = DW_ATE_float;
break;
}
Encoding = DW_ATE_imaginary_float;
break;
case TY::Tcomplex32:
case TY::Tcomplex64:
case TY::Tcomplex80:
if (emitCodeView) {
// DW_ATE_complex_float not supported by the LLVM DWARF->CodeView
// conversion
return CreateComplexType(t);
}
Encoding = DW_ATE_complex_float;
break;
default:
llvm_unreachable(
"Unsupported basic type for debug info in DIBuilder::CreateBasicType");
}
return DBuilder.createBasicType(type->toChars(), // name
getTypeAllocSize(T) * 8, // size (bits)
Encoding);
}
DIType DIBuilder::CreateEnumType(TypeEnum *type) {
EnumDeclaration *const ed = type->sym;
if (!ed->memtype) // opaque enum
return CreateUnspecifiedType(ed);
if (ed->isSpecial()) // magic enums: forward to base type
return CreateTypeDescription(ed->memtype);
DIScope scope = nullptr;
const auto name = GetNameAndScope(ed, scope);
const auto lineNumber = ed->loc.linnum;
const auto file = CreateFile(ed);
// just emit a typedef for non-integral base types
auto tb = type->toBasetype();
if (!tb->isintegral()) {
auto tbase = CreateTypeDescription(tb);
return DBuilder.createTypedef(tbase, name, file, lineNumber, scope);
}
llvm::SmallVector<LLMetadata *, 8> subscripts;
if (ed->members) {
for (auto m : *ed->members) {
EnumMember *em = m->isEnumMember();
if (auto ie = em->value()->isIntegerExp()) {
subscripts.push_back(
DBuilder.createEnumerator(em->toChars(), ie->toInteger()));
}
}
}
llvm::Type *const T = DtoType(type);
return DBuilder.createEnumerationType(
scope, name, file, lineNumber,
getTypeAllocSize(T) * 8, // size (bits)
getABITypeAlign(T) * 8, // align (bits)
DBuilder.getOrCreateArray(subscripts), // subscripts
CreateTypeDescription(ed->memtype));
}
DIType DIBuilder::CreatePointerType(TypePointer *type) {
// TODO: The addressspace is important for dcompute targets. See e.g.
// https://www.mail-archive.com/dwarf-discuss@lists.dwarfstd.org/msg00326.html
const llvm::Optional<unsigned> DWARFAddressSpace = llvm::None;
const auto name = processDIName(type->toPrettyChars(true));
return DBuilder.createPointerType(
CreateTypeDescription(type->nextOf(), /*voidToUbyte=*/true),
target.ptrsize * 8, 0, DWARFAddressSpace, name);
}
DIType DIBuilder::CreateVectorType(TypeVector *type) {
LLType *T = DtoType(type);
const auto dim = type->basetype->isTypeSArray()->dim->toInteger();
#if LDC_LLVM_VER >= 1100
const auto Dim = llvm::ConstantAsMetadata::get(DtoConstSize_t(dim));
auto subscript = DBuilder.getOrCreateSubrange(Dim, nullptr, nullptr, nullptr);
#else
auto subscript = DBuilder.getOrCreateSubrange(0, dim);
#endif
return DBuilder.createVectorType(
getTypeAllocSize(T) * 8, // size (bits)
getABITypeAlign(T) * 8, // align (bits)
CreateTypeDescription(type->elementType(), /*voidToUbyte=*/true),
DBuilder.getOrCreateArray({subscript}) // subscripts
);
}
DIType DIBuilder::CreateComplexType(Type *type) {
Type *t = type->toBasetype();
llvm::Type *T = DtoType(type);
Type *elemtype = nullptr;
switch (t->ty) {
case TY::Tcomplex32:
elemtype = Type::tfloat32;
break;
case TY::Tcomplex64:
elemtype = Type::tfloat64;
break;
case TY::Tcomplex80:
elemtype = Type::tfloat80;
break;
default:
llvm_unreachable(
"Unexpected type for debug info in DIBuilder::CreateComplexType");
}
DIFile file = CreateFile();
auto imoffset = getTypeAllocSize(DtoType(elemtype));
LLMetadata *elems[] = {
CreateMemberType(0, elemtype, file, "re", 0, Visibility::public_),
CreateMemberType(0, elemtype, file, "im", imoffset, Visibility::public_)};
return DBuilder.createStructType(GetCU(),
t->toChars(), // Name
file, // File
0, // LineNo
getTypeAllocSize(T) * 8, // size in bits
getABITypeAlign(T) * 8, // alignment
DIFlags::FlagZero, // What here?
nullptr, // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
nullptr, // VTableHolder
uniqueIdent(t)); // UniqueIdentifier
}
DIType DIBuilder::CreateMemberType(unsigned linnum, Type *type, DIFile file,
const char *c_name, unsigned offset,
Visibility::Kind visibility, bool isStatic,
DIScope scope) {
llvm::Type *T = DtoType(type);
// find base type
DIType basetype = CreateTypeDescription(type);
auto Flags = DIFlags::FlagZero;
switch (visibility) {
case Visibility::private_:
Flags = DIFlags::FlagPrivate;
break;
case Visibility::protected_:
Flags = DIFlags::FlagProtected;
break;
case Visibility::public_:
Flags = DIFlags::FlagPublic;
break;
default:
break;
}
if (isStatic)
Flags |= DIFlags::FlagStaticMember;
return DBuilder.createMemberType(scope,
c_name, // name
file, // file
linnum, // line number
getTypeAllocSize(T) * 8, // size (bits)
getABITypeAlign(T) * 8, // align (bits)
offset * 8, // offset (bits)
Flags, // flags
basetype // derived from
);
}
void DIBuilder::AddFields(AggregateDeclaration *ad, DIFile file,
llvm::SmallVector<LLMetadata *, 16> &elems) {
size_t narr = ad->fields.length;
elems.reserve(narr);
for (auto vd : ad->fields) {
if (vd->type->toBasetype()->isTypeNoreturn())
continue;
elems.push_back(CreateMemberType(vd->loc.linnum, vd->type, file,
vd->toChars(), vd->offset,
vd->visibility.kind));
}
}
void DIBuilder::AddStaticMembers(AggregateDeclaration *ad, DIFile file,
llvm::SmallVector<LLMetadata *, 16> &elems) {
auto members = ad->members;
if (!members)
return;
auto scope = CreateCompositeType(ad->getType());
std::function<void(Dsymbols *)> visitMembers = [&](Dsymbols *members) {
for (auto s : *members) {
if (auto attrib = s->isAttribDeclaration()) {
if (Dsymbols *d = attrib->include(nullptr))
visitMembers(d);
} else if (auto tmixin = s->isTemplateMixin()) {
// FIXME: static variables inside a template mixin need to be put inside
// a child DICompositeType for their value to become accessible
// (mangling issue).
// Also DWARF supports imported declarations, but LLVM
// currently does nothing with DIImportedEntity except at CU-level.
visitMembers(tmixin->members);
} else if (auto vd = s->isVarDeclaration())
if (vd->isDataseg() && !vd->aliassym /* TODO: tuples*/ &&
!vd->type->toBasetype()->isTypeNoreturn()) {
llvm::MDNode *elem =
CreateMemberType(vd->loc.linnum, vd->type, file, vd->toChars(), 0,
vd->visibility.kind,
/*isStatic = */ true, scope);
elems.push_back(elem);
StaticDataMemberCache[vd].reset(elem);
}
} /*else if (auto fd = s->isFuncDeclaration())*/ // Clang also adds static
// functions as
// declarations, but they
// already work without
// adding them.
};
visitMembers(members);
}
DIType DIBuilder::CreateCompositeType(Type *t) {
assert((t->ty == TY::Tstruct || t->ty == TY::Tclass) &&
"Unsupported type for debug info in DIBuilder::CreateCompositeType");
AggregateDeclaration *ad;
if (t->ty == TY::Tstruct) {
ad = static_cast<TypeStruct *>(t)->sym;
} else {
ad = static_cast<TypeClass *>(t)->sym;
}
// Use the actual type associated with the declaration, ignoring any
// const/wrappers.
LLType *T = DtoType(ad->type);
if (t->ty == TY::Tclass)
T = T->getPointerElementType();
IrAggr *irAggr = getIrAggr(ad, true);
if (irAggr->diCompositeType) {
return irAggr->diCompositeType;
}
DIScope scope = nullptr;
const auto name = GetNameAndScope(ad, scope);
// if we don't know the aggregate's size, we don't know enough about it
// to provide debug info. probably a forward-declared struct?
if (ad->sizeok == Sizeok::none) {
return CreateUnspecifiedType(ad);
}
assert(GetCU() && "Compilation unit missing or corrupted");
// elements
llvm::SmallVector<LLMetadata *, 16> elems;
// defaults
const auto file = CreateFile(ad);
const auto lineNum = ad->loc.linnum;
const auto sizeInBits = T->isSized() ? getTypeAllocSize(T) * 8 : 0;
const auto alignmentInBits = T->isSized() ? getABITypeAlign(T) * 8 : 0;
const auto classOffsetInBits = 0;
DIType derivedFrom = nullptr;
const auto vtableHolder = nullptr;
const auto templateParams = nullptr;
const auto uniqueIdentifier = uniqueIdent(t);
// set diCompositeType to handle recursive types properly
unsigned tag = (t->ty == TY::Tstruct) ? llvm::dwarf::DW_TAG_structure_type
: llvm::dwarf::DW_TAG_class_type;
irAggr->diCompositeType =
DBuilder.createReplaceableCompositeType(tag, name, scope, file, lineNum);
if (!ad->isInterfaceDeclaration()) // plain interfaces don't have one
{
ClassDeclaration *classDecl = ad->isClassDeclaration();
if (classDecl && classDecl->baseClass) {
derivedFrom = CreateCompositeType(classDecl->baseClass->getType());
auto dt = DBuilder.createInheritance(irAggr->diCompositeType,
derivedFrom, // base class type
0, // offset of base class
0, // offset of virtual base pointer
DIFlags::FlagPublic);
elems.push_back(dt);
}
AddFields(ad, file, elems);
}
AddStaticMembers(ad, file, elems);
const auto elemsArray = DBuilder.getOrCreateArray(elems);
DIType ret;
if (t->ty == TY::Tclass) {
ret = DBuilder.createClassType(
scope, name, file, lineNum, sizeInBits, alignmentInBits,
classOffsetInBits, DIFlags::FlagZero, derivedFrom, elemsArray,
vtableHolder, templateParams, uniqueIdentifier);
} else {
const auto runtimeLang = 0;
ret = DBuilder.createStructType(scope, name, file, lineNum, sizeInBits,
alignmentInBits, DIFlags::FlagZero,
derivedFrom, elemsArray, runtimeLang,
vtableHolder, uniqueIdentifier);
}
irAggr->diCompositeType =
DBuilder.replaceTemporary(llvm::TempDINode(irAggr->diCompositeType), ret);
return irAggr->diCompositeType;
}
DIType DIBuilder::CreateArrayType(TypeArray *type) {
llvm::Type *T = DtoType(type);
const auto scope = GetCU();
const auto name = processDIName(type->toPrettyChars(true));
const auto file = CreateFile();
LLMetadata *elems[] = {CreateMemberType(0, Type::tsize_t, file, "length", 0,
Visibility::public_),
CreateMemberType(0, type->nextOf()->pointerTo(), file,
"ptr", target.ptrsize,
Visibility::public_)};
return DBuilder.createStructType(scope, name, file,
0, // LineNo
getTypeAllocSize(T) * 8, // size in bits
getABITypeAlign(T) * 8, // alignment in bits
DIFlags::FlagZero, // What here?
nullptr, // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
nullptr, // VTableHolder
uniqueIdent(type)); // UniqueIdentifier
}
DIType DIBuilder::CreateSArrayType(TypeSArray *type) {
llvm::Type *T = DtoType(type);
Type *te = type;
llvm::SmallVector<LLMetadata *, 8> subscripts;
for (; te->ty == TY::Tsarray; te = te->nextOf()) {
TypeSArray *tsa = static_cast<TypeSArray *>(te);
const auto count = tsa->dim->toInteger();
#if LDC_LLVM_VER >= 1100
const auto Count = llvm::ConstantAsMetadata::get(DtoConstSize_t(count));
const auto subscript =
DBuilder.getOrCreateSubrange(Count, nullptr, nullptr, nullptr);
#else
const auto subscript = DBuilder.getOrCreateSubrange(0, count);
#endif
subscripts.push_back(subscript);
}
return DBuilder.createArrayType(
getTypeAllocSize(T) * 8, // size (bits)
getABITypeAlign(T) * 8, // align (bits)
CreateTypeDescription(te, /*voidToUbyte=*/true),
DBuilder.getOrCreateArray(subscripts) // subscripts
);
}
DIType DIBuilder::CreateAArrayType(TypeAArray *type) {
llvm::Type *T = DtoType(type);
auto tindex = CreateTypeDescription(type->index);
auto tvalue = CreateTypeDescription(type->nextOf());
const auto scope = GetCU();
const auto name = processDIName(type->toPrettyChars(true));
const auto file = CreateFile();
LLMetadata *elems[] = {
DBuilder.createTypedef(tindex, "__key_t", file, 0, scope),
DBuilder.createTypedef(tvalue, "__val_t", file, 0, scope),
CreateMemberType(0, Type::tvoidptr, file, "ptr", 0, Visibility::public_)};
return DBuilder.createStructType(scope, name, file,
0, // LineNo
getTypeAllocSize(T) * 8, // size in bits
getABITypeAlign(T) * 8, // alignment in bits
DIFlags::FlagZero, // What here?
nullptr, // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
nullptr, // VTableHolder
uniqueIdent(type)); // UniqueIdentifier
}
////////////////////////////////////////////////////////////////////////////////
DISubroutineType DIBuilder::CreateFunctionType(Type *type) {
TypeFunction *t = type->isTypeFunction();
assert(t);
Type *retType = t->next;
// Create "dummy" subroutine type for the return type
LLMetadata *params = {CreateTypeDescription(retType)};
auto paramsArray = DBuilder.getOrCreateTypeArray(params);
return DBuilder.createSubroutineType(paramsArray, DIFlags::FlagZero, 0);
}
DISubroutineType DIBuilder::CreateEmptyFunctionType() {
auto paramsArray = DBuilder.getOrCreateTypeArray(llvm::None);
return DBuilder.createSubroutineType(paramsArray);
}
DIType DIBuilder::CreateDelegateType(TypeDelegate *type) {
llvm::Type *T = DtoType(type);
const auto scope = GetCU();
const auto name = processDIName(type->toPrettyChars(true));
const auto file = CreateFile();
LLMetadata *elems[] = {
CreateMemberType(0, Type::tvoidptr, file, "ptr", 0,
Visibility::public_),
CreateMemberType(0, type->next->pointerTo(), file, "funcptr",
target.ptrsize, Visibility::public_)};
return DBuilder.createStructType(scope, name, file,
0, // line number where defined
getTypeAllocSize(T) * 8, // size in bits
getABITypeAlign(T) * 8, // alignment in bits
DIFlags::FlagZero, // flags
nullptr, // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
nullptr, // VTableHolder
uniqueIdent(type)); // UniqueIdentifier
}
DIType DIBuilder::CreateUnspecifiedType(Dsymbol *sym) {
return DBuilder.createUnspecifiedType(
processDIName(sym->toPrettyChars(true)));
}
////////////////////////////////////////////////////////////////////////////////
DIType DIBuilder::CreateTypeDescription(Type *t, bool voidToUbyte) {
if (voidToUbyte && t->toBasetype()->ty == TY::Tvoid)
t = Type::tuns8;
if (t->ty == TY::Tvoid || t->ty == TY::Tnoreturn)
return nullptr;
if (t->ty == TY::Tnull) {
// display null as void*
return DBuilder.createPointerType(
CreateTypeDescription(Type::tvoid), target.ptrsize * 8, 0,
/* DWARFAddressSpace */ llvm::None, "typeof(null)");
}
if (auto te = t->isTypeEnum())
return CreateEnumType(te);
if (auto tv = t->isTypeVector())
return CreateVectorType(tv);
if (t->isintegral() || t->isfloating())
return CreateBasicType(t);
if (auto tp = t->isTypePointer())
return CreatePointerType(tp);
if (auto ta = t->isTypeDArray())
return CreateArrayType(ta);
if (auto tsa = t->isTypeSArray())
return CreateSArrayType(tsa);
if (auto taa = t->isTypeAArray())
return CreateAArrayType(taa);
if (t->ty == TY::Tstruct)
return CreateCompositeType(t);
if (auto tc = t->isTypeClass()) {
const auto aggregateDIType = CreateCompositeType(t);
const auto name =
(tc->sym->toPrettyChars(true) + llvm::StringRef("*")).str();
return DBuilder.createPointerType(aggregateDIType, target.ptrsize * 8, 0,
llvm::None, processDIName(name));
}
if (auto tf = t->isTypeFunction())
return CreateFunctionType(tf);
if (auto td = t->isTypeDelegate())
return CreateDelegateType(td);
// Crash if the type is not supported.
llvm_unreachable("Unsupported type in debug info");
}
////////////////////////////////////////////////////////////////////////////////
llvm::DICompileUnit::DebugEmissionKind getDebugEmissionKind() {
switch (global.params.symdebug) {
case 0:
return llvm::DICompileUnit::NoDebug;
case 1:
case 2:
return llvm::DICompileUnit::FullDebug;
case 3:
return llvm::DICompileUnit::LineTablesOnly;
default:
llvm_unreachable("unknown DebugEmissionKind");
}
}
void DIBuilder::EmitCompileUnit(Module *m) {
if (!mustEmitLocationsDebugInfo()) {
return;
}
Logger::println("D to dwarf compile_unit");
LOG_SCOPE;
assert(!CUNode && "Already created compile unit for this DIBuilder instance");
// prepare producer name string
auto producerName =
std::string("LDC ") + ldc_version + " (LLVM " + llvm_version + ")";
if (emitCodeView) {
IR->module.addModuleFlag(llvm::Module::Warning, "CodeView", 1);
} else {
unsigned dwarfVersion = global.params.dwarfVersion;
if (dwarfVersion == 0 &&
global.params.targetTriple->isWindowsMSVCEnvironment()) {
// clang 10 defaults to v4
dwarfVersion = 4;
}
if (dwarfVersion > 0) {
IR->module.addModuleFlag(llvm::Module::Warning, "Dwarf Version",
dwarfVersion);
}
}
// Metadata without a correct version will be stripped by UpgradeDebugInfo.
IR->module.addModuleFlag(llvm::Module::Warning, "Debug Info Version",
llvm::DEBUG_METADATA_VERSION);
CUNode = DBuilder.createCompileUnit(
global.params.symdebug == 2 ? llvm::dwarf::DW_LANG_C_plus_plus
: llvm::dwarf::DW_LANG_D,
CreateFile(m->srcfile.toChars()), producerName,
isOptimizationEnabled(), // isOptimized
llvm::StringRef(), // Flags TODO
1, // Runtime Version TODO
llvm::StringRef(), // SplitName
getDebugEmissionKind(), // DebugEmissionKind
0 // DWOId
);
}
DIModule DIBuilder::EmitModule(Module *m) {
if (!mustEmitFullDebugInfo()) {
return nullptr;
}
IrModule *irm = getIrModule(m);
if (irm->diModule)
return irm->diModule;
const auto name = processDIName(m->toPrettyChars(true));
irm->diModule = DBuilder.createModule(
CreateFile(m->srcfile.toChars()),
name, // qualified module name
llvm::StringRef(), // (clang modules specific) ConfigurationMacros
llvm::StringRef(), // (clang modules specific) IncludePath
llvm::StringRef() // (clang modules specific) ISysRoot
);
return irm->diModule;
}
DINamespace DIBuilder::EmitNamespace(Dsymbol *sym, llvm::StringRef name) {
name = processDIName(name);
const bool exportSymbols = true;
return DBuilder.createNameSpace(GetSymbolScope(sym), name, exportSymbols);
}
void DIBuilder::EmitImport(Import *im) {
if (!mustEmitFullDebugInfo()) {
return;
}
auto diModule = EmitModule(im->mod);
DBuilder.createImportedModule(GetCurrentScope(),
diModule, // imported module
CreateFile(im), // file
im->loc.linnum // line num
);
}
DISubprogram DIBuilder::EmitSubProgram(FuncDeclaration *fd) {
if (!mustEmitLocationsDebugInfo()) {
return nullptr;
}
IrFunction *const irFunc = getIrFunc(fd);
if (irFunc->diSubprogram)
return irFunc->diSubprogram;
Logger::println("D to dwarf subprogram");
LOG_SCOPE;
assert(GetCU() &&
"Compilation unit missing or corrupted in DIBuilder::EmitSubProgram");
DIScope scope = nullptr;
llvm::StringRef name;
// FIXME: work around apparent LLVM CodeView bug wrt. nested functions
if (emitCodeView && fd->toParent2()->isFuncDeclaration()) {
// emit into module & use fully qualified name
scope = GetCU();
name = processDIName(fd->toPrettyChars(true));
} else if (fd->isMain()) {
scope = GetSymbolScope(fd);
name = fd->toPrettyChars(true); // `D main`
} else {
name = GetNameAndScope(fd, scope);
}
const auto linkageName = irFunc->getLLVMFuncName();
const auto file = CreateFile(fd);
const auto lineNo = fd->loc.linnum;
const auto isLocalToUnit = fd->visibility.kind == Visibility::private_;
const auto isDefinition = true;
const auto scopeLine = lineNo; // FIXME
const auto flags = DIFlags::FlagPrototyped;
const auto isOptimized = isOptimizationEnabled();
const auto dispFlags =
llvm::DISubprogram::toSPFlags(isLocalToUnit, isDefinition, isOptimized);
DISubroutineType diFnType = nullptr;
if (!mustEmitFullDebugInfo()) {
diFnType = CreateEmptyFunctionType();
} else {
// A special case is `auto foo() { struct S{}; S s; return s; }`
// The return type is a nested struct, so for this particular
// chicken-and-egg case we need to create a temporary subprogram.
irFunc->diSubprogram = DBuilder.createTempFunctionFwdDecl(
scope, name, linkageName, file, lineNo, /*ty=*/nullptr, scopeLine,
flags, dispFlags);
// Now create subroutine type.
diFnType = CreateFunctionType(fd->type);
}
// FIXME: duplicates?
auto SP = CreateFunction(scope, name, linkageName, file, lineNo, diFnType,
isLocalToUnit, isDefinition, isOptimized, scopeLine,
flags);
if (mustEmitFullDebugInfo())
DBuilder.replaceTemporary(llvm::TempDINode(irFunc->diSubprogram), SP);
irFunc->diSubprogram = SP;
return SP;
}
DISubprogram DIBuilder::CreateFunction(DIScope scope, llvm::StringRef name,
llvm::StringRef linkageName, DIFile file,
unsigned lineNo, DISubroutineType ty,
bool isLocalToUnit, bool isDefinition,
bool isOptimized, unsigned scopeLine,
DIFlags flags) {
const auto dispFlags =
llvm::DISubprogram::toSPFlags(isLocalToUnit, isDefinition, isOptimized);
return DBuilder.createFunction(scope, name, linkageName, file, lineNo, ty,
scopeLine, flags, dispFlags);
}
DISubprogram DIBuilder::EmitThunk(llvm::Function *Thunk, FuncDeclaration *fd) {
if (!mustEmitLocationsDebugInfo()) {
return nullptr;
}
Logger::println("Thunk to dwarf subprogram");
LOG_SCOPE;
assert(GetCU() &&
"Compilation unit missing or corrupted in DIBuilder::EmitThunk");
// Create subroutine type (thunk has same type as wrapped function)
DISubroutineType DIFnType = CreateFunctionType(fd->type);
const auto scope = GetSymbolScope(fd);
const auto name = (llvm::Twine(fd->toChars()) + ".__thunk").str();
const auto linkageName = Thunk->getName();
const auto file = CreateFile(fd);
const auto lineNo = fd->loc.linnum;
const bool isLocalToUnit = fd->visibility.kind == Visibility::private_;
const bool isDefinition = true;
const bool isOptimized = isOptimizationEnabled();
const auto scopeLine = lineNo; // FIXME
const auto flags = DIFlags::FlagPrototyped;
return CreateFunction(scope, name, linkageName, file, lineNo, DIFnType,
isLocalToUnit, isDefinition, isOptimized, scopeLine,
flags);
}
DISubprogram DIBuilder::EmitModuleCTor(llvm::Function *Fn,
llvm::StringRef prettyname) {
if (!mustEmitLocationsDebugInfo()) {
return nullptr;
}
Logger::println("D to dwarf subprogram");
LOG_SCOPE;
assert(GetCU() &&
"Compilation unit missing or corrupted in DIBuilder::EmitSubProgram");
DIFile file = CreateFile();
// Create "dummy" subroutine type for the return type
LLMetadata *params = {CreateTypeDescription(Type::tvoid)};
auto paramsArray = DBuilder.getOrCreateTypeArray(params);
auto DIFnType = DBuilder.createSubroutineType(paramsArray);
const auto scope = GetCurrentScope();
const auto linkageName = Fn->getName();
const auto lineNo = 0;
const bool isLocalToUnit = true;
const bool isDefinition = true;
const bool isOptimized = isOptimizationEnabled();
const auto scopeLine = 0; // FIXME
const auto flags = DIFlags::FlagPrototyped | DIFlags::FlagArtificial;
auto SP = CreateFunction(scope, prettyname, linkageName, file, lineNo,
DIFnType, isLocalToUnit, isDefinition, isOptimized,
scopeLine, flags);
Fn->setSubprogram(SP);
return SP;
}
void DIBuilder::EmitFuncStart(FuncDeclaration *fd) {
if (!mustEmitLocationsDebugInfo())
return;
Logger::println("D to dwarf funcstart");
LOG_SCOPE;
auto irFunc = getIrFunc(fd);
assert(irFunc->diSubprogram);
irFunc->getLLVMFunc()->setSubprogram(irFunc->diSubprogram);
IR->ir->SetCurrentDebugLocation({}); // clear first
EmitStopPoint(fd->loc);
}
void DIBuilder::EmitBlockStart(const Loc &loc) {
if (!mustEmitLocationsDebugInfo())
return;
Logger::println("D to dwarf block start");
LOG_SCOPE;
DILexicalBlock block = DBuilder.createLexicalBlock(
GetCurrentScope(), CreateFile(loc), loc.linnum, getColumn(loc));
IR->func()->diLexicalBlocks.push(block);
EmitStopPoint(loc);
}
void DIBuilder::EmitBlockEnd() {
if (!mustEmitLocationsDebugInfo())
return;
Logger::println("D to dwarf block end");
LOG_SCOPE;
IrFunction *fn = IR->func();
assert(!fn->diLexicalBlocks.empty());
fn->diLexicalBlocks.pop();
}
void DIBuilder::EmitStopPoint(const Loc &loc) {
if (!mustEmitLocationsDebugInfo())
return;
// If we already have a location set and the current loc is invalid
// (line 0), then we can just ignore it (see GitHub issue #998 for why we
// cannot do this in all cases).
if (!loc.linnum && IR->ir->getCurrentDebugLocation())
return;
unsigned linnum = loc.linnum;
// without proper loc use the line of the enclosing symbol that has line
// number debug info
for (Dsymbol *sym = IR->func()->decl; sym && !linnum; sym = sym->parent)
linnum = sym->loc.linnum;
if (!linnum)
linnum = 1;
unsigned col = getColumn(loc);
Logger::println("D to dwarf stoppoint at line %u, column %u", linnum, col);
LOG_SCOPE;
IR->ir->SetCurrentDebugLocation(
llvm::DILocation::get(IR->context(), linnum, col, GetCurrentScope()));
}
void DIBuilder::EmitValue(llvm::Value *val, VarDeclaration *vd) {
auto sub = IR->func()->variableMap.find(vd);
if (sub == IR->func()->variableMap.end())
return;
DILocalVariable debugVariable = sub->second;
if (!mustEmitFullDebugInfo() || !debugVariable)
return;
llvm::Instruction *instr = DBuilder.insertDbgValueIntrinsic(
val, debugVariable, DBuilder.createExpression(),
IR->ir->getCurrentDebugLocation(), IR->scopebb());
instr->setDebugLoc(IR->ir->getCurrentDebugLocation());
}
void DIBuilder::EmitLocalVariable(llvm::Value *ll, VarDeclaration *vd,
Type *type, bool isThisPtr, bool forceAsLocal,
bool isRefRVal,
#if LDC_LLVM_VER >= 1400
llvm::ArrayRef<uint64_t> addr
#else
llvm::ArrayRef<int64_t> addr
#endif
) {
if (!mustEmitFullDebugInfo())
return;
Logger::println("D to dwarf local variable");
LOG_SCOPE;
if (vd->type->toBasetype()->isTypeNoreturn()) {
Logger::println("of type noreturn, skip");
return;
}
auto &variableMap = IR->func()->variableMap;
auto sub = variableMap.find(vd);
if (sub != variableMap.end())
return; // ensure that the debug variable is created only once
// get type description
if (!type)
type = vd->type;
DIType TD = CreateTypeDescription(type);
if (static_cast<llvm::MDNode *>(TD) == nullptr)
return; // unsupported
const bool isRefOrOut = vd->isRef() || vd->isOut(); // incl. special-ref vars
const bool isParameter = vd->isParameter();
// For MSVC x64, some by-value parameters need to be declared as DI locals to
// work around garbage for both cdb and VS debuggers.
if (emitCodeView && isParameter && !forceAsLocal && !isRefOrOut &&
global.params.targetTriple->isArch64Bit()) {
// 1) params rewritten by IndirectByvalRewrite
if (isaArgument(ll) && addr.empty()) {
forceAsLocal = true;
} else {
// 2) dynamic arrays, delegates and vectors
TY ty = type->toBasetype()->ty;
if (ty == TY::Tarray || ty == TY::Tdelegate || ty == TY::Tvector)
forceAsLocal = true;
}
}
bool useDbgValueIntrinsic = false;
if (isRefOrOut) {
// DW_TAG_reference_type sounds like the correct tag for `this`, but member
// function calls won't work with GDB unless `this` gets declared as
// DW_TAG_pointer_type.
// This matches what GDC and Clang do.
auto Tag = isThisPtr ? llvm::dwarf::DW_TAG_pointer_type
: llvm::dwarf::DW_TAG_reference_type;
// With the exception of special-ref loop variables, the reference/pointer
// itself is constant. So we don't have to attach the debug information to a
// memory location and can use llvm.dbg.value to set the constant pointer
// for the DI reference.
useDbgValueIntrinsic = !isSpecialRefVar(vd) && isRefRVal;
// Note: createReferenceType expects the size to be the size of a pointer,
// not the size of the type the reference refers to.
TD = DBuilder.createReferenceType(
Tag, TD,
gDataLayout->getPointerSizeInBits(), // size (bits)
DtoAlignment(type) * 8); // align (bits)
}
// get variable description
assert(!vd->isDataseg() && "static variable");
const auto scope = GetCurrentScope();
const auto name = vd->toChars();
const auto file = CreateFile(vd);
const auto lineNum = vd->loc.linnum;
const auto preserve = true;
auto flags = !isThisPtr
? DIFlags::FlagZero
: DIFlags::FlagArtificial | DIFlags::FlagObjectPointer;
DILocalVariable debugVariable;
if (!forceAsLocal && isParameter) {
FuncDeclaration *fd = vd->parent->isFuncDeclaration();
assert(fd);
size_t argNo = 0;
if (fd->vthis != vd) {
assert(fd->parameters);
auto it = std::find(fd->parameters->begin(), fd->parameters->end(), vd);
assert(it != fd->parameters->end());
argNo = it - fd->parameters->begin();
if (fd->vthis)
argNo++;
}
debugVariable = DBuilder.createParameterVariable(
scope, name, argNo + 1, file, lineNum, TD, preserve, flags);
} else {
debugVariable = DBuilder.createAutoVariable(scope, name, file, lineNum, TD,
preserve, flags);
}
variableMap[vd] = debugVariable;
if (useDbgValueIntrinsic) {
SetValue(vd->loc, ll, debugVariable,
addr.empty() ? DBuilder.createExpression()
: DBuilder.createExpression(addr));
} else {
Declare(vd->loc, ll, debugVariable,
addr.empty() ? DBuilder.createExpression()
: DBuilder.createExpression(addr));
}
}
void DIBuilder::EmitGlobalVariable(llvm::GlobalVariable *llVar,
VarDeclaration *vd) {
if (!mustEmitFullDebugInfo())
return;
Logger::println("D to dwarf global_variable");
LOG_SCOPE;
if (vd->type->toBasetype()->isTypeNoreturn()) {
Logger::println("of type noreturn, skip");
return;
}
assert(vd->isDataseg() ||
(vd->storage_class & (STCconst | STCimmutable) && vd->_init));
DIScope scope = GetSymbolScope(vd);
llvm::MDNode *Decl = nullptr;
if (vd->isDataseg() && vd->toParent()->isAggregateDeclaration()) {
// static aggregate member
Decl = StaticDataMemberCache[vd];
assert(Decl && "static aggregate member not declared");
}
OutBuffer mangleBuf;
mangleToBuffer(vd, &mangleBuf);
auto DIVar = DBuilder.createGlobalVariableExpression(
scope, // context
vd->toChars(), // name
mangleBuf.peekChars(), // linkage name
CreateFile(vd), // file
vd->loc.linnum, // line num
CreateTypeDescription(vd->type), // type
vd->visibility.kind == Visibility::private_, // is local to unit
#if LDC_LLVM_VER >= 1000
!(vd->storage_class & STCextern), // bool isDefined
#endif
nullptr, // DIExpression *Expr
Decl // declaration
);
llVar->addDebugInfo(DIVar);
}
void DIBuilder::Finalize() {
if (!mustEmitLocationsDebugInfo())
return;
DBuilder.finalize();
}
} // namespace ldc
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