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dibuilder.cpp
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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/identifier.h"
#include "dmd/import.h"
#include "dmd/ldcbindings.h"
#include "dmd/mangle.h"
#include "dmd/module.h"
#include "dmd/mtype.h"
#include "dmd/nspace.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, size_t nameLength);
namespace {
DIType getNullDIType() { return nullptr; }
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)) {}
llvm::LLVMContext &DIBuilder::getContext() { return IR->context(); }
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())
CreateCompositeTypeDescription(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 CreateCompositeTypeDescription(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()) {
return CreateEnumType(ed->getType());
} 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::DebugLoc::get(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::DebugLoc::get(loc.linnum, getColumn(loc), GetCurrentScope());
DBuilder.insertDbgValueIntrinsic(value, divar, diexpr, debugLoc,
IR->scopebb());
}
DIFile DIBuilder::CreateFile(const Loc &loc) {
const char *filename = loc.filename;
if (!filename)
filename = IR->dmodule->srcfile.toChars();
llvm::SmallString<128> path(filename);
llvm::sys::fs::make_absolute(path);
return DBuilder.createFile(llvm::sys::path::filename(path),
llvm::sys::path::parent_path(path));
}
DIFile DIBuilder::CreateFile() {
Loc loc(IR->dmodule->srcfile.toChars(), 0, 0);
return CreateFile(loc);
}
DIFile DIBuilder::CreateFile(Dsymbol *decl) {
Loc loc;
for (Dsymbol *sym = decl; sym && !loc.filename; sym = sym->parent)
loc = sym->loc;
return loc.filename ? CreateFile(loc) : CreateFile();
}
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 Tbool:
Encoding = DW_ATE_boolean;
break;
case Tchar:
if (emitCodeView) {
// VS debugger does not support DW_ATE_UTF for char
Encoding = DW_ATE_unsigned_char;
break;
}
// fall through
case Twchar:
case Tdchar:
Encoding = DW_ATE_UTF;
break;
case Tint8:
if (emitCodeView) {
// VS debugger does not support DW_ATE_signed for 8-bit
Encoding = DW_ATE_signed_char;
break;
}
// fall through
case Tint16:
case Tint32:
case Tint64:
case Tint128:
Encoding = DW_ATE_signed;
break;
case Tuns8:
if (emitCodeView) {
// VS debugger does not support DW_ATE_unsigned for 8-bit
Encoding = DW_ATE_unsigned_char;
break;
}
// fall through
case Tuns16:
case Tuns32:
case Tuns64:
case Tuns128:
Encoding = DW_ATE_unsigned;
break;
case Tfloat32:
case Tfloat64:
case Tfloat80:
Encoding = DW_ATE_float;
break;
case Timaginary32:
case Timaginary64:
case 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 Tcomplex32:
case Tcomplex64:
case 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(Type *type) {
assert(type->ty == Tenum);
llvm::Type *const T = DtoType(type);
EnumDeclaration *const ed = static_cast<TypeEnum *>(type)->sym;
assert(ed->memtype);
if (ed->isSpecial()) {
return CreateBasicType(ed->memtype);
}
llvm::SmallVector<LLMetadata *, 8> subscripts;
for (auto m : *ed->members) {
EnumMember *em = m->isEnumMember();
if (auto ie = em->value()->isIntegerExp()) {
subscripts.push_back(
DBuilder.createEnumerator(em->toChars(), ie->toInteger()));
} else {
subscripts.clear();
break;
}
}
DIScope scope = nullptr;
const auto name = GetNameAndScope(ed, scope);
const auto lineNumber = ed->loc.linnum;
const auto file = CreateFile(ed);
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(Type *type) {
llvm::Type *T = DtoType(type);
Type *t = type->toBasetype();
assert(t->ty == Tpointer);
// find base type
Type *nt = t->nextOf();
// translate void pointers to byte pointers
if (nt->toBasetype()->ty == Tvoid)
nt = Type::tuns8;
// 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(nt),
getTypeAllocSize(T) * 8, // size (bits)
getABITypeAlign(T) * 8, // align (bits)
DWARFAddressSpace, name);
}
DIType DIBuilder::CreateVectorType(Type *type) {
LLType *T = DtoType(type);
Type *t = type->toBasetype();
assert(t->ty == Tvector &&
"Only vectors allowed for debug info in DIBuilder::CreateVectorType");
TypeVector *tv = static_cast<TypeVector *>(t);
Type *te = tv->elementType();
// translate void vectors to byte vectors
if (te->toBasetype()->ty == Tvoid)
te = Type::tuns8;
const auto dim = tv->size(Loc()) / te->size(Loc());
#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(te), // element type
DBuilder.getOrCreateArray({subscript}) // subscripts
);
}
DIType DIBuilder::CreateComplexType(Type *type) {
llvm::Type *T = DtoType(type);
Type *t = type->toBasetype();
Type *elemtype = nullptr;
switch (t->ty) {
case Tcomplex32:
elemtype = Type::tfloat32;
break;
case Tcomplex64:
elemtype = Type::tfloat64;
break;
case 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, Prot::public_),
CreateMemberType(0, elemtype, file, "im", imoffset, Prot::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?
getNullDIType(), // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
getNullDIType(), // VTableHolder
uniqueIdent(t)); // UniqueIdentifier
}
DIType DIBuilder::CreateTypedef(unsigned linnum, Type *type, DIFile file,
const char *c_name) {
Type *t = type->toBasetype();
// translate functions to function pointers
if (t->ty == Tfunction)
t = t->pointerTo();
// find base type
DIType basetype = CreateTypeDescription(t);
return DBuilder.createTypedef(basetype, c_name, file, linnum, GetCU());
}
DIType DIBuilder::CreateMemberType(unsigned linnum, Type *type, DIFile file,
const char *c_name, unsigned offset,
Prot::Kind prot, bool isStatic,
DIScope scope) {
Type *t = type->toBasetype();
// translate functions to function pointers
if (t->ty == Tfunction)
t = t->pointerTo();
llvm::Type *T = DtoType(t);
// find base type
DIType basetype = CreateTypeDescription(t);
auto Flags = DIFlags::FlagZero;
switch (prot) {
case Prot::private_:
Flags = DIFlags::FlagPrivate;
break;
case Prot::protected_:
Flags = DIFlags::FlagProtected;
break;
case Prot::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) {
elems.push_back(CreateMemberType(vd->loc.linnum, vd->type, file,
vd->toChars(), vd->offset,
vd->prot().kind));
}
}
void DIBuilder::AddStaticMembers(AggregateDeclaration *ad, DIFile file,
llvm::SmallVector<LLMetadata *, 16> &elems) {
auto members = ad->members;
if (!members)
return;
auto scope = CreateCompositeTypeDescription(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*/) {
llvm::MDNode *elem = CreateMemberType(
vd->loc.linnum, vd->type, file, vd->toChars(), 0, vd->prot().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 *type) {
Type *t = type->toBasetype();
assert((t->ty == Tstruct || t->ty == Tclass) &&
"Unsupported type for debug info in DIBuilder::CreateCompositeType");
AggregateDeclaration *ad;
if (t->ty == Tstruct) {
TypeStruct *ts = static_cast<TypeStruct *>(t);
ad = ts->sym;
} else {
TypeClass *tc = static_cast<TypeClass *>(t);
ad = tc->sym;
}
assert(ad);
// Use the actual type associated with the declaration, ignoring any
// const/wrappers.
LLType *T = DtoType(ad->type);
if (t->ty == Tclass)
T = T->getPointerElementType();
IrAggr *irAggr = getIrAggr(ad, true);
if (static_cast<llvm::MDNode *>(irAggr->diCompositeType) != nullptr) {
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 == SIZEOKnone) {
return DBuilder.createUnspecifiedType(name);
}
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;
auto derivedFrom = getNullDIType();
const auto vtableHolder = getNullDIType();
const auto templateParams = nullptr;
const auto uniqueIdentifier = uniqueIdent(t);
// set diCompositeType to handle recursive types properly
unsigned tag = (t->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());
// needs a forward declaration to add inheritence information to elems
const auto elemsArray = nullptr;
DIType fwd = DBuilder.createClassType(
scope, name, file, lineNum, sizeInBits, alignmentInBits,
classOffsetInBits, DIFlags::FlagFwdDecl, derivedFrom, elemsArray,
vtableHolder, templateParams, uniqueIdentifier);
auto dt = DBuilder.createInheritance(fwd,
derivedFrom, // base class type
0, // offset of base class
#if LDC_LLVM_VER >= 700
0, // offset of virtual base pointer
#endif
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 == 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);
irAggr->diCompositeType = ret;
return ret;
}
DIType DIBuilder::CreateArrayType(Type *type) {
llvm::Type *T = DtoType(type);
Type *t = type->toBasetype();
assert(t->ty == Tarray);
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, Prot::public_),
CreateMemberType(0, t->nextOf()->pointerTo(), file, "ptr",
global.params.is64bit ? 8 : 4, Prot::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?
getNullDIType(), // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
getNullDIType(), // VTableHolder
uniqueIdent(t)); // UniqueIdentifier
}
DIType DIBuilder::CreateSArrayType(Type *type) {
llvm::Type *T = DtoType(type);
Type *t = type->toBasetype();
assert(t->ty == Tsarray);
// find base type
llvm::SmallVector<LLMetadata *, 8> subscripts;
while (t->ty == Tsarray) {
TypeSArray *tsa = static_cast<TypeSArray *>(t);
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);
t = t->nextOf();
}
// element type: void => byte, function => function pointer
t = t->toBasetype();
if (t->ty == Tvoid)
t = Type::tuns8;
else if (t->ty == Tfunction)
t = t->pointerTo();
return DBuilder.createArrayType(
getTypeAllocSize(T) * 8, // size (bits)
getABITypeAlign(T) * 8, // align (bits)
CreateTypeDescription(t), // element type
DBuilder.getOrCreateArray(subscripts) // subscripts
);
}
DIType DIBuilder::CreateAArrayType(Type *type) {
llvm::Type *T = DtoType(type);
Type *t = type->toBasetype();
assert(t->ty == Taarray);
TypeAArray *typeAArray = static_cast<TypeAArray *>(t);
Type *index = typeAArray->index;
Type *value = typeAArray->nextOf();
const auto scope = GetCU();
const auto name = processDIName(type->toPrettyChars(true));
const auto file = CreateFile();
LLMetadata *elems[] = {
CreateTypedef(0, index, file, "__key_t"),
CreateTypedef(0, value, file, "__val_t"),
CreateMemberType(0, Type::tvoidptr, file, "ptr", 0, Prot::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?
getNullDIType(), // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
getNullDIType(), // VTableHolder
uniqueIdent(t)); // UniqueIdentifier
}
////////////////////////////////////////////////////////////////////////////////
// new calling convention constant being proposed as a Dwarf extension
const unsigned DW_CC_D_dmd = 0x43;
DISubroutineType DIBuilder::CreateFunctionType(Type *type) {
assert(type->toBasetype()->ty == Tfunction);
TypeFunction *t = static_cast<TypeFunction *>(type);
Type *retType = t->next;
// Create "dummy" subroutine type for the return type
LLMetadata *params = {CreateTypeDescription(retType)};
auto paramsArray = DBuilder.getOrCreateTypeArray(params);
// The calling convention has to be recorded to distinguish
// extern(D) functions from extern(C++) ones.
DtoType(t);
assert(t->ctype);
unsigned CC = t->ctype->getIrFuncTy().reverseParams ? DW_CC_D_dmd : 0;
return DBuilder.createSubroutineType(paramsArray, DIFlags::FlagZero, CC);
}
DISubroutineType DIBuilder::CreateEmptyFunctionType() {
auto paramsArray = DBuilder.getOrCreateTypeArray(llvm::None);
return DBuilder.createSubroutineType(paramsArray);
}
DIType DIBuilder::CreateDelegateType(Type *type) {
Type *const tb = type->toBasetype();
assert(tb->ty == Tdelegate);
auto t = static_cast<TypeDelegate *>(tb);
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, "context", 0, Prot::public_),
CreateMemberType(0, t->next, file, "funcptr",
global.params.is64bit ? 8 : 4, Prot::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
getNullDIType(), // derived from
DBuilder.getOrCreateArray(elems),
0, // RunTimeLang
getNullDIType(), // VTableHolder
uniqueIdent(type)); // UniqueIdentifier
}
////////////////////////////////////////////////////////////////////////////////
bool isOpaqueEnumType(Type *type) {
if (type->ty != Tenum)
return false;
TypeEnum *te = static_cast<TypeEnum *>(type);
return !te->sym->memtype;
}
DIType DIBuilder::CreateTypeDescription(Type *type) {
// Check for opaque enum first, Bugzilla 13792
if (isOpaqueEnumType(type)) {
const auto ed = static_cast<TypeEnum *>(type)->sym;
return DBuilder.createUnspecifiedType(ed->toChars());
}
Type *t = type->toBasetype();
if (t->ty == Tvoid)
return nullptr;
if (t->ty == Tnull) {
// display null as void*
return DBuilder.createPointerType(CreateTypeDescription(Type::tvoid), 8, 8,
/* DWARFAddressSpace */ llvm::None,
"typeof(null)");
}
if (t->ty == Tvector)
return CreateVectorType(type);
if (t->isintegral() || t->isfloating()) {
if (type->ty == Tenum)
return CreateEnumType(type);
return CreateBasicType(type);
}
if (t->ty == Tpointer)
return CreatePointerType(type);
if (t->ty == Tarray)
return CreateArrayType(type);
if (t->ty == Tsarray)
return CreateSArrayType(type);
if (t->ty == Taarray)
return CreateAArrayType(type);
if (t->ty == Tstruct)
return CreateCompositeType(type);
if (t->ty == Tclass) {
LLType *T = DtoType(t);
const auto aggregateDIType = CreateCompositeType(type);
const auto name = (aggregateDIType->getName() + "*").str();
return DBuilder.createPointerType(aggregateDIType, getTypeAllocSize(T) * 8,
getABITypeAlign(T) * 8, llvm::None, name);
}
if (t->ty == Tfunction)
return CreateFunctionType(type);
if (t->ty == Tdelegate)
return CreateDelegateType(type);
// Crash if the type is not supported.
llvm_unreachable("Unsupported type in debug info");
}
DICompositeType DIBuilder::CreateCompositeTypeDescription(Type *type) {
DIType ret = type->toBasetype()->ty == Tclass ? CreateCompositeType(type)
: CreateTypeDescription(type);
return llvm::cast<llvm::DICompositeType>(ret);
}
////////////////////////////////////////////////////////////////////////////////
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 srcpath
llvm::SmallString<128> srcpath(m->srcfile.toChars());
llvm::sys::fs::make_absolute(srcpath);
// 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,
DBuilder.createFile(llvm::sys::path::filename(srcpath),
llvm::sys::path::parent_path(srcpath)),
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(
CUNode,
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();