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DWARFASTParserClang.cpp
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DWARFASTParserClang.cpp
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//===-- DWARFASTParserClang.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <stdlib.h>
#include "DWARFASTParserClang.h"
#include "DWARFDebugInfo.h"
#include "DWARFDeclContext.h"
#include "DWARFDefines.h"
#include "SymbolFileDWARF.h"
#include "SymbolFileDWARFDebugMap.h"
#include "SymbolFileDWARFDwo.h"
#include "UniqueDWARFASTType.h"
#include "Plugins/ExpressionParser/Clang/ClangASTImporter.h"
#include "Plugins/ExpressionParser/Clang/ClangASTMetadata.h"
#include "Plugins/ExpressionParser/Clang/ClangUtil.h"
#include "Plugins/Language/ObjC/ObjCLanguage.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/Value.h"
#include "lldb/Host/Host.h"
#include "lldb/Symbol/CompileUnit.h"
#include "lldb/Symbol/Function.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Symbol/TypeList.h"
#include "lldb/Symbol/TypeMap.h"
#include "lldb/Target/Language.h"
#include "lldb/Utility/LLDBAssert.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/StreamString.h"
#include "llvm/Demangle/Demangle.h"
#include "clang/AST/CXXInheritance.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclTemplate.h"
#include <map>
#include <memory>
#include <vector>
//#define ENABLE_DEBUG_PRINTF // COMMENT OUT THIS LINE PRIOR TO CHECKIN
#ifdef ENABLE_DEBUG_PRINTF
#include <stdio.h>
#define DEBUG_PRINTF(fmt, ...) printf(fmt, __VA_ARGS__)
#else
#define DEBUG_PRINTF(fmt, ...)
#endif
using namespace lldb;
using namespace lldb_private;
DWARFASTParserClang::DWARFASTParserClang(TypeSystemClang &ast)
: m_ast(ast), m_die_to_decl_ctx(), m_decl_ctx_to_die() {}
DWARFASTParserClang::~DWARFASTParserClang() {}
static AccessType DW_ACCESS_to_AccessType(uint32_t dwarf_accessibility) {
switch (dwarf_accessibility) {
case DW_ACCESS_public:
return eAccessPublic;
case DW_ACCESS_private:
return eAccessPrivate;
case DW_ACCESS_protected:
return eAccessProtected;
default:
break;
}
return eAccessNone;
}
static bool DeclKindIsCXXClass(clang::Decl::Kind decl_kind) {
switch (decl_kind) {
case clang::Decl::CXXRecord:
case clang::Decl::ClassTemplateSpecialization:
return true;
default:
break;
}
return false;
}
ClangASTImporter &DWARFASTParserClang::GetClangASTImporter() {
if (!m_clang_ast_importer_up) {
m_clang_ast_importer_up = std::make_unique<ClangASTImporter>();
}
return *m_clang_ast_importer_up;
}
/// Detect a forward declaration that is nested in a DW_TAG_module.
static bool IsClangModuleFwdDecl(const DWARFDIE &Die) {
if (!Die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0))
return false;
auto Parent = Die.GetParent();
while (Parent.IsValid()) {
if (Parent.Tag() == DW_TAG_module)
return true;
Parent = Parent.GetParent();
}
return false;
}
static DWARFDIE GetContainingClangModuleDIE(const DWARFDIE &die) {
if (die.IsValid()) {
DWARFDIE top_module_die;
// Now make sure this DIE is scoped in a DW_TAG_module tag and return true
// if so
for (DWARFDIE parent = die.GetParent(); parent.IsValid();
parent = parent.GetParent()) {
const dw_tag_t tag = parent.Tag();
if (tag == DW_TAG_module)
top_module_die = parent;
else if (tag == DW_TAG_compile_unit || tag == DW_TAG_partial_unit)
break;
}
return top_module_die;
}
return DWARFDIE();
}
static lldb::ModuleSP GetContainingClangModule(const DWARFDIE &die) {
if (die.IsValid()) {
DWARFDIE clang_module_die = GetContainingClangModuleDIE(die);
if (clang_module_die) {
const char *module_name = clang_module_die.GetName();
if (module_name)
return die.GetDWARF()->GetExternalModule(
lldb_private::ConstString(module_name));
}
}
return lldb::ModuleSP();
}
TypeSP DWARFASTParserClang::ParseTypeFromClangModule(const SymbolContext &sc,
const DWARFDIE &die,
Log *log) {
ModuleSP clang_module_sp = GetContainingClangModule(die);
if (!clang_module_sp)
return TypeSP();
// If this type comes from a Clang module, recursively look in the
// DWARF section of the .pcm file in the module cache. Clang
// generates DWO skeleton units as breadcrumbs to find them.
llvm::SmallVector<CompilerContext, 4> decl_context;
die.GetDeclContext(decl_context);
TypeMap pcm_types;
// The type in the Clang module must have the same language as the current CU.
LanguageSet languages;
languages.Insert(SymbolFileDWARF::GetLanguage(*die.GetCU()));
llvm::DenseSet<SymbolFile *> searched_symbol_files;
clang_module_sp->GetSymbolFile()->FindTypes(decl_context, languages,
searched_symbol_files, pcm_types);
if (pcm_types.Empty()) {
// Since this type is defined in one of the Clang modules imported
// by this symbol file, search all of them. Instead of calling
// sym_file->FindTypes(), which would return this again, go straight
// to the imported modules.
auto &sym_file = die.GetCU()->GetSymbolFileDWARF();
// Well-formed clang modules never form cycles; guard against corrupted
// ones by inserting the current file.
searched_symbol_files.insert(&sym_file);
sym_file.ForEachExternalModule(
*sc.comp_unit, searched_symbol_files, [&](Module &module) {
module.GetSymbolFile()->FindTypes(decl_context, languages,
searched_symbol_files, pcm_types);
return pcm_types.GetSize();
});
}
if (!pcm_types.GetSize())
return TypeSP();
// We found a real definition for this type in the Clang module, so lets use
// it and cache the fact that we found a complete type for this die.
TypeSP pcm_type_sp = pcm_types.GetTypeAtIndex(0);
if (!pcm_type_sp)
return TypeSP();
lldb_private::CompilerType pcm_type = pcm_type_sp->GetForwardCompilerType();
lldb_private::CompilerType type =
GetClangASTImporter().CopyType(m_ast, pcm_type);
if (!type)
return TypeSP();
// Under normal operation pcm_type is a shallow forward declaration
// that gets completed later. This is necessary to support cyclic
// data structures. If, however, pcm_type is already complete (for
// example, because it was loaded for a different target before),
// the definition needs to be imported right away, too.
// Type::ResolveClangType() effectively ignores the ResolveState
// inside type_sp and only looks at IsDefined(), so it never calls
// ClangASTImporter::ASTImporterDelegate::ImportDefinitionTo(),
// which does extra work for Objective-C classes. This would result
// in only the forward declaration to be visible.
if (pcm_type.IsDefined())
GetClangASTImporter().RequireCompleteType(ClangUtil::GetQualType(type));
SymbolFileDWARF *dwarf = die.GetDWARF();
TypeSP type_sp(new Type(die.GetID(), dwarf, pcm_type_sp->GetName(),
pcm_type_sp->GetByteSize(nullptr), nullptr,
LLDB_INVALID_UID, Type::eEncodingInvalid,
&pcm_type_sp->GetDeclaration(), type,
Type::ResolveState::Forward,
TypePayloadClang(GetOwningClangModule(die))));
dwarf->GetTypeList().Insert(type_sp);
dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get();
clang::TagDecl *tag_decl = TypeSystemClang::GetAsTagDecl(type);
if (tag_decl) {
LinkDeclContextToDIE(tag_decl, die);
} else {
clang::DeclContext *defn_decl_ctx = GetCachedClangDeclContextForDIE(die);
if (defn_decl_ctx)
LinkDeclContextToDIE(defn_decl_ctx, die);
}
return type_sp;
}
static void ForcefullyCompleteType(CompilerType type) {
bool started = TypeSystemClang::StartTagDeclarationDefinition(type);
lldbassert(started && "Unable to start a class type definition.");
TypeSystemClang::CompleteTagDeclarationDefinition(type);
const clang::TagDecl *td = ClangUtil::GetAsTagDecl(type);
auto &ts = llvm::cast<TypeSystemClang>(*type.GetTypeSystem());
ts.GetMetadata(td)->SetIsForcefullyCompleted();
}
/// Complete a type from debug info, or mark it as forcefully completed if
/// there is no definition of the type in the current Module. Call this function
/// in contexts where the usual C++ rules require a type to be complete (base
/// class, member, etc.).
static void RequireCompleteType(CompilerType type) {
// Technically, enums can be incomplete too, but we don't handle those as they
// are emitted even under -flimit-debug-info.
if (!TypeSystemClang::IsCXXClassType(type))
return;
if (type.GetCompleteType())
return;
// No complete definition in this module. Mark the class as complete to
// satisfy local ast invariants, but make a note of the fact that
// it is not _really_ complete so we can later search for a definition in a
// different module.
// Since we provide layout assistance, layouts of types containing this class
// will be correct even if we are not able to find the definition elsewhere.
ForcefullyCompleteType(type);
}
/// This function serves a similar purpose as RequireCompleteType above, but it
/// avoids completing the type if it is not immediately necessary. It only
/// ensures we _can_ complete the type later.
static void PrepareContextToReceiveMembers(TypeSystemClang &ast,
ClangASTImporter &ast_importer,
clang::DeclContext *decl_ctx,
DWARFDIE die,
const char *type_name_cstr) {
auto *tag_decl_ctx = clang::dyn_cast<clang::TagDecl>(decl_ctx);
if (!tag_decl_ctx)
return; // Non-tag context are always ready.
// We have already completed the type, or we have found its definition and are
// ready to complete it later (cf. ParseStructureLikeDIE).
if (tag_decl_ctx->isCompleteDefinition() || tag_decl_ctx->isBeingDefined())
return;
// We reach this point of the tag was present in the debug info as a
// declaration only. If it was imported from another AST context (in the
// gmodules case), we can complete the type by doing a full import.
// If this type was not imported from an external AST, there's nothing to do.
CompilerType type = ast.GetTypeForDecl(tag_decl_ctx);
if (type && ast_importer.CanImport(type)) {
auto qual_type = ClangUtil::GetQualType(type);
if (ast_importer.RequireCompleteType(qual_type))
return;
die.GetDWARF()->GetObjectFile()->GetModule()->ReportError(
"Unable to complete the Decl context for DIE '%s' at offset "
"0x%8.8x.\nPlease file a bug report.",
type_name_cstr ? type_name_cstr : "", die.GetOffset());
}
// We don't have a type definition and/or the import failed. We must
// forcefully complete the type to avoid crashes.
ForcefullyCompleteType(type);
}
ParsedDWARFTypeAttributes::ParsedDWARFTypeAttributes(const DWARFDIE &die) {
DWARFAttributes attributes;
size_t num_attributes = die.GetAttributes(attributes);
for (size_t i = 0; i < num_attributes; ++i) {
dw_attr_t attr = attributes.AttributeAtIndex(i);
DWARFFormValue form_value;
if (!attributes.ExtractFormValueAtIndex(i, form_value))
continue;
switch (attr) {
case DW_AT_abstract_origin:
abstract_origin = form_value;
break;
case DW_AT_accessibility:
accessibility = DW_ACCESS_to_AccessType(form_value.Unsigned());
break;
case DW_AT_artificial:
is_artificial = form_value.Boolean();
break;
case DW_AT_bit_stride:
bit_stride = form_value.Unsigned();
break;
case DW_AT_byte_size:
byte_size = form_value.Unsigned();
break;
case DW_AT_byte_stride:
byte_stride = form_value.Unsigned();
break;
case DW_AT_calling_convention:
calling_convention = form_value.Unsigned();
break;
case DW_AT_containing_type:
containing_type = form_value;
break;
case DW_AT_decl_file:
// die.GetCU() can differ if DW_AT_specification uses DW_FORM_ref_addr.
decl.SetFile(
attributes.CompileUnitAtIndex(i)->GetFile(form_value.Unsigned()));
break;
case DW_AT_decl_line:
decl.SetLine(form_value.Unsigned());
break;
case DW_AT_decl_column:
decl.SetColumn(form_value.Unsigned());
break;
case DW_AT_declaration:
is_forward_declaration = form_value.Boolean();
break;
case DW_AT_encoding:
encoding = form_value.Unsigned();
break;
case DW_AT_enum_class:
is_scoped_enum = form_value.Boolean();
break;
case DW_AT_explicit:
is_explicit = form_value.Boolean();
break;
case DW_AT_external:
if (form_value.Unsigned())
storage = clang::SC_Extern;
break;
case DW_AT_inline:
is_inline = form_value.Boolean();
break;
case DW_AT_linkage_name:
case DW_AT_MIPS_linkage_name:
mangled_name = form_value.AsCString();
break;
case DW_AT_name:
name.SetCString(form_value.AsCString());
break;
case DW_AT_object_pointer:
object_pointer = form_value.Reference();
break;
case DW_AT_signature:
signature = form_value;
break;
case DW_AT_specification:
specification = form_value;
break;
case DW_AT_type:
type = form_value;
break;
case DW_AT_virtuality:
is_virtual = form_value.Boolean();
break;
case DW_AT_APPLE_objc_complete_type:
is_complete_objc_class = form_value.Signed();
break;
case DW_AT_APPLE_objc_direct:
is_objc_direct_call = true;
break;
case DW_AT_APPLE_runtime_class:
class_language = (LanguageType)form_value.Signed();
break;
case DW_AT_GNU_vector:
is_vector = form_value.Boolean();
break;
case DW_AT_export_symbols:
exports_symbols = form_value.Boolean();
break;
}
}
}
static std::string GetUnitName(const DWARFDIE &die) {
if (DWARFUnit *unit = die.GetCU())
return unit->GetAbsolutePath().GetPath();
return "<missing DWARF unit path>";
}
TypeSP DWARFASTParserClang::ParseTypeFromDWARF(const SymbolContext &sc,
const DWARFDIE &die,
bool *type_is_new_ptr) {
if (type_is_new_ptr)
*type_is_new_ptr = false;
if (!die)
return nullptr;
Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION |
DWARF_LOG_LOOKUPS));
SymbolFileDWARF *dwarf = die.GetDWARF();
if (log) {
DWARFDIE context_die;
clang::DeclContext *context =
GetClangDeclContextContainingDIE(die, &context_die);
dwarf->GetObjectFile()->GetModule()->LogMessage(
log,
"DWARFASTParserClang::ParseTypeFromDWARF "
"(die = 0x%8.8x, decl_ctx = %p (die 0x%8.8x)) %s name = '%s')",
die.GetOffset(), static_cast<void *>(context), context_die.GetOffset(),
die.GetTagAsCString(), die.GetName());
}
Type *type_ptr = dwarf->GetDIEToType().lookup(die.GetDIE());
if (type_ptr == DIE_IS_BEING_PARSED)
return nullptr;
if (type_ptr)
return type_ptr->shared_from_this();
// Set a bit that lets us know that we are currently parsing this
dwarf->GetDIEToType()[die.GetDIE()] = DIE_IS_BEING_PARSED;
ParsedDWARFTypeAttributes attrs(die);
if (DWARFDIE signature_die = attrs.signature.Reference()) {
if (TypeSP type_sp =
ParseTypeFromDWARF(sc, signature_die, type_is_new_ptr)) {
dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get();
if (clang::DeclContext *decl_ctx =
GetCachedClangDeclContextForDIE(signature_die))
LinkDeclContextToDIE(decl_ctx, die);
return type_sp;
}
return nullptr;
}
if (type_is_new_ptr)
*type_is_new_ptr = true;
const dw_tag_t tag = die.Tag();
TypeSP type_sp;
switch (tag) {
case DW_TAG_typedef:
case DW_TAG_base_type:
case DW_TAG_pointer_type:
case DW_TAG_reference_type:
case DW_TAG_rvalue_reference_type:
case DW_TAG_const_type:
case DW_TAG_restrict_type:
case DW_TAG_volatile_type:
case DW_TAG_atomic_type:
case DW_TAG_unspecified_type: {
type_sp = ParseTypeModifier(sc, die, attrs);
break;
}
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_class_type: {
type_sp = ParseStructureLikeDIE(sc, die, attrs);
break;
}
case DW_TAG_enumeration_type: {
type_sp = ParseEnum(sc, die, attrs);
break;
}
case DW_TAG_inlined_subroutine:
case DW_TAG_subprogram:
case DW_TAG_subroutine_type: {
type_sp = ParseSubroutine(die, attrs);
break;
}
case DW_TAG_array_type: {
type_sp = ParseArrayType(die, attrs);
break;
}
case DW_TAG_ptr_to_member_type: {
type_sp = ParsePointerToMemberType(die, attrs);
break;
}
default:
dwarf->GetObjectFile()->GetModule()->ReportError(
"{0x%8.8x}: unhandled type tag 0x%4.4x (%s), please file a bug and "
"attach the file at the start of this error message",
die.GetOffset(), tag, DW_TAG_value_to_name(tag));
break;
}
// TODO: We should consider making the switch above exhaustive to simplify
// control flow in ParseTypeFromDWARF. Then, we could simply replace this
// return statement with a call to llvm_unreachable.
return UpdateSymbolContextScopeForType(sc, die, type_sp);
}
lldb::TypeSP
DWARFASTParserClang::ParseTypeModifier(const SymbolContext &sc,
const DWARFDIE &die,
ParsedDWARFTypeAttributes &attrs) {
Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION |
DWARF_LOG_LOOKUPS));
SymbolFileDWARF *dwarf = die.GetDWARF();
const dw_tag_t tag = die.Tag();
LanguageType cu_language = SymbolFileDWARF::GetLanguage(*die.GetCU());
Type::ResolveState resolve_state = Type::ResolveState::Unresolved;
Type::EncodingDataType encoding_data_type = Type::eEncodingIsUID;
TypeSP type_sp;
CompilerType clang_type;
if (tag == DW_TAG_typedef) {
// DeclContext will be populated when the clang type is materialized in
// Type::ResolveCompilerType.
PrepareContextToReceiveMembers(
m_ast, GetClangASTImporter(),
GetClangDeclContextContainingDIE(die, nullptr), die,
attrs.name.GetCString());
if (attrs.type.IsValid()) {
// Try to parse a typedef from the (DWARF embedded in the) Clang
// module file first as modules can contain typedef'ed
// structures that have no names like:
//
// typedef struct { int a; } Foo;
//
// In this case we will have a structure with no name and a
// typedef named "Foo" that points to this unnamed
// structure. The name in the typedef is the only identifier for
// the struct, so always try to get typedefs from Clang modules
// if possible.
//
// The type_sp returned will be empty if the typedef doesn't
// exist in a module file, so it is cheap to call this function
// just to check.
//
// If we don't do this we end up creating a TypeSP that says
// this is a typedef to type 0x123 (the DW_AT_type value would
// be 0x123 in the DW_TAG_typedef), and this is the unnamed
// structure type. We will have a hard time tracking down an
// unnammed structure type in the module debug info, so we make
// sure we don't get into this situation by always resolving
// typedefs from the module.
const DWARFDIE encoding_die = attrs.type.Reference();
// First make sure that the die that this is typedef'ed to _is_
// just a declaration (DW_AT_declaration == 1), not a full
// definition since template types can't be represented in
// modules since only concrete instances of templates are ever
// emitted and modules won't contain those
if (encoding_die &&
encoding_die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 1) {
type_sp = ParseTypeFromClangModule(sc, die, log);
if (type_sp)
return type_sp;
}
}
}
DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\") type => 0x%8.8lx\n", die.GetID(),
DW_TAG_value_to_name(tag), type_name_cstr,
encoding_uid.Reference());
switch (tag) {
default:
break;
case DW_TAG_unspecified_type:
if (attrs.name == "nullptr_t" || attrs.name == "decltype(nullptr)") {
resolve_state = Type::ResolveState::Full;
clang_type = m_ast.GetBasicType(eBasicTypeNullPtr);
break;
}
// Fall through to base type below in case we can handle the type
// there...
LLVM_FALLTHROUGH;
case DW_TAG_base_type:
resolve_state = Type::ResolveState::Full;
clang_type = m_ast.GetBuiltinTypeForDWARFEncodingAndBitSize(
attrs.name.GetStringRef(), attrs.encoding,
attrs.byte_size.getValueOr(0) * 8);
break;
case DW_TAG_pointer_type:
encoding_data_type = Type::eEncodingIsPointerUID;
break;
case DW_TAG_reference_type:
encoding_data_type = Type::eEncodingIsLValueReferenceUID;
break;
case DW_TAG_rvalue_reference_type:
encoding_data_type = Type::eEncodingIsRValueReferenceUID;
break;
case DW_TAG_typedef:
encoding_data_type = Type::eEncodingIsTypedefUID;
break;
case DW_TAG_const_type:
encoding_data_type = Type::eEncodingIsConstUID;
break;
case DW_TAG_restrict_type:
encoding_data_type = Type::eEncodingIsRestrictUID;
break;
case DW_TAG_volatile_type:
encoding_data_type = Type::eEncodingIsVolatileUID;
break;
case DW_TAG_atomic_type:
encoding_data_type = Type::eEncodingIsAtomicUID;
break;
}
if (!clang_type && (encoding_data_type == Type::eEncodingIsPointerUID ||
encoding_data_type == Type::eEncodingIsTypedefUID)) {
if (tag == DW_TAG_pointer_type) {
DWARFDIE target_die = die.GetReferencedDIE(DW_AT_type);
if (target_die.GetAttributeValueAsUnsigned(DW_AT_APPLE_block, 0)) {
// Blocks have a __FuncPtr inside them which is a pointer to a
// function of the proper type.
for (DWARFDIE child_die = target_die.GetFirstChild();
child_die.IsValid(); child_die = child_die.GetSibling()) {
if (!strcmp(child_die.GetAttributeValueAsString(DW_AT_name, ""),
"__FuncPtr")) {
DWARFDIE function_pointer_type =
child_die.GetReferencedDIE(DW_AT_type);
if (function_pointer_type) {
DWARFDIE function_type =
function_pointer_type.GetReferencedDIE(DW_AT_type);
bool function_type_is_new_pointer;
TypeSP lldb_function_type_sp = ParseTypeFromDWARF(
sc, function_type, &function_type_is_new_pointer);
if (lldb_function_type_sp) {
clang_type = m_ast.CreateBlockPointerType(
lldb_function_type_sp->GetForwardCompilerType());
encoding_data_type = Type::eEncodingIsUID;
attrs.type.Clear();
resolve_state = Type::ResolveState::Full;
}
}
break;
}
}
}
}
if (cu_language == eLanguageTypeObjC ||
cu_language == eLanguageTypeObjC_plus_plus) {
if (attrs.name) {
if (attrs.name == "id") {
if (log)
dwarf->GetObjectFile()->GetModule()->LogMessage(
log,
"SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' "
"is Objective-C 'id' built-in type.",
die.GetOffset(), die.GetTagAsCString(), die.GetName());
clang_type = m_ast.GetBasicType(eBasicTypeObjCID);
encoding_data_type = Type::eEncodingIsUID;
attrs.type.Clear();
resolve_state = Type::ResolveState::Full;
} else if (attrs.name == "Class") {
if (log)
dwarf->GetObjectFile()->GetModule()->LogMessage(
log,
"SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' "
"is Objective-C 'Class' built-in type.",
die.GetOffset(), die.GetTagAsCString(), die.GetName());
clang_type = m_ast.GetBasicType(eBasicTypeObjCClass);
encoding_data_type = Type::eEncodingIsUID;
attrs.type.Clear();
resolve_state = Type::ResolveState::Full;
} else if (attrs.name == "SEL") {
if (log)
dwarf->GetObjectFile()->GetModule()->LogMessage(
log,
"SymbolFileDWARF::ParseType (die = 0x%8.8x) %s '%s' "
"is Objective-C 'selector' built-in type.",
die.GetOffset(), die.GetTagAsCString(), die.GetName());
clang_type = m_ast.GetBasicType(eBasicTypeObjCSel);
encoding_data_type = Type::eEncodingIsUID;
attrs.type.Clear();
resolve_state = Type::ResolveState::Full;
}
} else if (encoding_data_type == Type::eEncodingIsPointerUID &&
attrs.type.IsValid()) {
// Clang sometimes erroneously emits id as objc_object*. In that
// case we fix up the type to "id".
const DWARFDIE encoding_die = attrs.type.Reference();
if (encoding_die && encoding_die.Tag() == DW_TAG_structure_type) {
llvm::StringRef struct_name = encoding_die.GetName();
if (struct_name == "objc_object") {
if (log)
dwarf->GetObjectFile()->GetModule()->LogMessage(
log,
"SymbolFileDWARF::ParseType (die = 0x%8.8x) %s "
"'%s' is 'objc_object*', which we overrode to "
"'id'.",
die.GetOffset(), die.GetTagAsCString(), die.GetName());
clang_type = m_ast.GetBasicType(eBasicTypeObjCID);
encoding_data_type = Type::eEncodingIsUID;
attrs.type.Clear();
resolve_state = Type::ResolveState::Full;
}
}
}
}
}
type_sp = std::make_shared<Type>(
die.GetID(), dwarf, attrs.name, attrs.byte_size, nullptr,
dwarf->GetUID(attrs.type.Reference()), encoding_data_type, &attrs.decl,
clang_type, resolve_state, TypePayloadClang(GetOwningClangModule(die)));
dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get();
return type_sp;
}
TypeSP DWARFASTParserClang::ParseEnum(const SymbolContext &sc,
const DWARFDIE &die,
ParsedDWARFTypeAttributes &attrs) {
Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION |
DWARF_LOG_LOOKUPS));
SymbolFileDWARF *dwarf = die.GetDWARF();
const dw_tag_t tag = die.Tag();
TypeSP type_sp;
if (attrs.is_forward_declaration) {
type_sp = ParseTypeFromClangModule(sc, die, log);
if (type_sp)
return type_sp;
DWARFDeclContext die_decl_ctx = SymbolFileDWARF::GetDWARFDeclContext(die);
type_sp = dwarf->FindDefinitionTypeForDWARFDeclContext(die_decl_ctx);
if (!type_sp) {
SymbolFileDWARFDebugMap *debug_map_symfile = dwarf->GetDebugMapSymfile();
if (debug_map_symfile) {
// We weren't able to find a full declaration in this DWARF,
// see if we have a declaration anywhere else...
type_sp = debug_map_symfile->FindDefinitionTypeForDWARFDeclContext(
die_decl_ctx);
}
}
if (type_sp) {
if (log) {
dwarf->GetObjectFile()->GetModule()->LogMessage(
log,
"SymbolFileDWARF(%p) - 0x%8.8x: %s type \"%s\" is a "
"forward declaration, complete type is 0x%8.8" PRIx64,
static_cast<void *>(this), die.GetOffset(),
DW_TAG_value_to_name(tag), attrs.name.GetCString(),
type_sp->GetID());
}
// We found a real definition for this type elsewhere so lets use
// it and cache the fact that we found a complete type for this
// die
dwarf->GetDIEToType()[die.GetDIE()] = type_sp.get();
clang::DeclContext *defn_decl_ctx =
GetCachedClangDeclContextForDIE(dwarf->GetDIE(type_sp->GetID()));
if (defn_decl_ctx)
LinkDeclContextToDIE(defn_decl_ctx, die);
return type_sp;
}
}
DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(),
DW_TAG_value_to_name(tag), type_name_cstr);
CompilerType enumerator_clang_type;
CompilerType clang_type;
clang_type.SetCompilerType(
&m_ast, dwarf->GetForwardDeclDieToClangType().lookup(die.GetDIE()));
if (!clang_type) {
if (attrs.type.IsValid()) {
Type *enumerator_type =
dwarf->ResolveTypeUID(attrs.type.Reference(), true);
if (enumerator_type)
enumerator_clang_type = enumerator_type->GetFullCompilerType();
}
if (!enumerator_clang_type) {
if (attrs.byte_size) {
enumerator_clang_type = m_ast.GetBuiltinTypeForDWARFEncodingAndBitSize(
"", DW_ATE_signed, *attrs.byte_size * 8);
} else {
enumerator_clang_type = m_ast.GetBasicType(eBasicTypeInt);
}
}
clang_type = m_ast.CreateEnumerationType(
attrs.name.GetCString(), GetClangDeclContextContainingDIE(die, nullptr),
GetOwningClangModule(die), attrs.decl, enumerator_clang_type,
attrs.is_scoped_enum);
} else {
enumerator_clang_type = m_ast.GetEnumerationIntegerType(clang_type);
}
LinkDeclContextToDIE(TypeSystemClang::GetDeclContextForType(clang_type), die);
type_sp = std::make_shared<Type>(
die.GetID(), dwarf, attrs.name, attrs.byte_size, nullptr,
dwarf->GetUID(attrs.type.Reference()), Type::eEncodingIsUID, &attrs.decl,
clang_type, Type::ResolveState::Forward,
TypePayloadClang(GetOwningClangModule(die)));
if (TypeSystemClang::StartTagDeclarationDefinition(clang_type)) {
if (die.HasChildren()) {
bool is_signed = false;
enumerator_clang_type.IsIntegerType(is_signed);
ParseChildEnumerators(clang_type, is_signed,
type_sp->GetByteSize(nullptr).getValueOr(0), die);
}
TypeSystemClang::CompleteTagDeclarationDefinition(clang_type);
} else {
dwarf->GetObjectFile()->GetModule()->ReportError(
"DWARF DIE at 0x%8.8x named \"%s\" was not able to start its "
"definition.\nPlease file a bug and attach the file at the "
"start of this error message",
die.GetOffset(), attrs.name.GetCString());
}
return type_sp;
}
TypeSP DWARFASTParserClang::ParseSubroutine(const DWARFDIE &die,
ParsedDWARFTypeAttributes &attrs) {
Log *log(LogChannelDWARF::GetLogIfAny(DWARF_LOG_TYPE_COMPLETION |
DWARF_LOG_LOOKUPS));
SymbolFileDWARF *dwarf = die.GetDWARF();
const dw_tag_t tag = die.Tag();
bool is_variadic = false;
bool is_static = false;
bool has_template_params = false;
unsigned type_quals = 0;
std::string object_pointer_name;
if (attrs.object_pointer) {
const char *object_pointer_name_cstr = attrs.object_pointer.GetName();
if (object_pointer_name_cstr)
object_pointer_name = object_pointer_name_cstr;
}
DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\")\n", die.GetID(),
DW_TAG_value_to_name(tag), type_name_cstr);
CompilerType return_clang_type;
Type *func_type = NULL;
if (attrs.type.IsValid())
func_type = dwarf->ResolveTypeUID(attrs.type.Reference(), true);
if (func_type)
return_clang_type = func_type->GetForwardCompilerType();
else
return_clang_type = m_ast.GetBasicType(eBasicTypeVoid);
std::vector<CompilerType> function_param_types;
std::vector<clang::ParmVarDecl *> function_param_decls;
// Parse the function children for the parameters
DWARFDIE decl_ctx_die;
clang::DeclContext *containing_decl_ctx =
GetClangDeclContextContainingDIE(die, &decl_ctx_die);
const clang::Decl::Kind containing_decl_kind =
containing_decl_ctx->getDeclKind();
bool is_cxx_method = DeclKindIsCXXClass(containing_decl_kind);
// Start off static. This will be set to false in
// ParseChildParameters(...) if we find a "this" parameters as the
// first parameter
if (is_cxx_method) {
is_static = true;
}
if (die.HasChildren()) {
bool skip_artificial = true;
ParseChildParameters(containing_decl_ctx, die, skip_artificial, is_static,
is_variadic, has_template_params,
function_param_types, function_param_decls,
type_quals);
}
bool ignore_containing_context = false;
// Check for templatized class member functions. If we had any
// DW_TAG_template_type_parameter or DW_TAG_template_value_parameter
// the DW_TAG_subprogram DIE, then we can't let this become a method in
// a class. Why? Because templatized functions are only emitted if one
// of the templatized methods is used in the current compile unit and
// we will end up with classes that may or may not include these member
// functions and this means one class won't match another class
// definition and it affects our ability to use a class in the clang
// expression parser. So for the greater good, we currently must not
// allow any template member functions in a class definition.
if (is_cxx_method && has_template_params) {
ignore_containing_context = true;
is_cxx_method = false;
}
// clang_type will get the function prototype clang type after this
// call
CompilerType clang_type = m_ast.CreateFunctionType(
return_clang_type, function_param_types.data(),
function_param_types.size(), is_variadic, type_quals);
if (attrs.name) {
bool type_handled = false;
if (tag == DW_TAG_subprogram || tag == DW_TAG_inlined_subroutine) {
ObjCLanguage::MethodName objc_method(attrs.name.GetStringRef(), true);
if (objc_method.IsValid(true)) {
CompilerType class_opaque_type;
ConstString class_name(objc_method.GetClassName());
if (class_name) {
TypeSP complete_objc_class_type_sp(
dwarf->FindCompleteObjCDefinitionTypeForDIE(DWARFDIE(),
class_name, false));
if (complete_objc_class_type_sp) {
CompilerType type_clang_forward_type =
complete_objc_class_type_sp->GetForwardCompilerType();
if (TypeSystemClang::IsObjCObjectOrInterfaceType(
type_clang_forward_type))
class_opaque_type = type_clang_forward_type;
}
}
if (class_opaque_type) {
// If accessibility isn't set to anything valid, assume public
// for now...
if (attrs.accessibility == eAccessNone)
attrs.accessibility = eAccessPublic;
clang::ObjCMethodDecl *objc_method_decl =
m_ast.AddMethodToObjCObjectType(
class_opaque_type, attrs.name.GetCString(), clang_type,
attrs.accessibility, attrs.is_artificial, is_variadic,
attrs.is_objc_direct_call);
type_handled = objc_method_decl != NULL;
if (type_handled) {
LinkDeclContextToDIE(objc_method_decl, die);
m_ast.SetMetadataAsUserID(objc_method_decl, die.GetID());
} else {