/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp

Bug Summary

File:	src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp
Warning:	line 542, column 37 Called C++ object pointer is null
Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name PDBASTParser.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../include -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/obj -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/include -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/obj/../include/lldb/Plugins -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp
1//===-- PDBASTParser.cpp --------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//

9#include "PDBASTParser.h"

11#include "SymbolFilePDB.h"

13#include "clang/AST/CharUnits.h"
14#include "clang/AST/Decl.h"
15#include "clang/AST/DeclCXX.h"

17#include "Plugins/ExpressionParser/Clang/ClangASTMetadata.h"
18#include "Plugins/ExpressionParser/Clang/ClangUtil.h"
19#include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
20#include "lldb/Core/Declaration.h"
21#include "lldb/Core/Module.h"
22#include "lldb/Symbol/SymbolFile.h"
23#include "lldb/Symbol/TypeMap.h"
24#include "lldb/Symbol/TypeSystem.h"

26#include "llvm/DebugInfo/PDB/IPDBLineNumber.h"
27#include "llvm/DebugInfo/PDB/IPDBSourceFile.h"
28#include "llvm/DebugInfo/PDB/PDBSymbol.h"
29#include "llvm/DebugInfo/PDB/PDBSymbolData.h"
30#include "llvm/DebugInfo/PDB/PDBSymbolFunc.h"
31#include "llvm/DebugInfo/PDB/PDBSymbolTypeArray.h"
32#include "llvm/DebugInfo/PDB/PDBSymbolTypeBuiltin.h"
33#include "llvm/DebugInfo/PDB/PDBSymbolTypeEnum.h"
34#include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionArg.h"
35#include "llvm/DebugInfo/PDB/PDBSymbolTypeFunctionSig.h"
36#include "llvm/DebugInfo/PDB/PDBSymbolTypePointer.h"
37#include "llvm/DebugInfo/PDB/PDBSymbolTypeTypedef.h"
38#include "llvm/DebugInfo/PDB/PDBSymbolTypeUDT.h"

40#include "Plugins/Language/CPlusPlus/MSVCUndecoratedNameParser.h"

42using namespace lldb;
43using namespace lldb_private;
44using namespace llvm::pdb;

46static int TranslateUdtKind(PDB_UdtType pdb_kind) {
switch (pdb_kind) {
case PDB_UdtType::Class:
  return clang::TTK_Class;
case PDB_UdtType::Struct:
  return clang::TTK_Struct;
case PDB_UdtType::Union:
  return clang::TTK_Union;
case PDB_UdtType::Interface:
  return clang::TTK_Interface;
}
llvm_unreachable("unsuported PDB UDT type")__builtin_unreachable();
58}

60static lldb::Encoding TranslateBuiltinEncoding(PDB_BuiltinType type) {
switch (type) {
case PDB_BuiltinType::Float:
  return lldb::eEncodingIEEE754;
case PDB_BuiltinType::Int:
case PDB_BuiltinType::Long:
case PDB_BuiltinType::Char:
  return lldb::eEncodingSint;
case PDB_BuiltinType::Bool:
case PDB_BuiltinType::Char16:
case PDB_BuiltinType::Char32:
case PDB_BuiltinType::UInt:
case PDB_BuiltinType::ULong:
case PDB_BuiltinType::HResult:
case PDB_BuiltinType::WCharT:
  return lldb::eEncodingUint;
default:
  return lldb::eEncodingInvalid;
}
79}

81static lldb::Encoding TranslateEnumEncoding(PDB_VariantType type) {
switch (type) {
case PDB_VariantType::Int8:
case PDB_VariantType::Int16:
case PDB_VariantType::Int32:
case PDB_VariantType::Int64:
  return lldb::eEncodingSint;

case PDB_VariantType::UInt8:
case PDB_VariantType::UInt16:
case PDB_VariantType::UInt32:
case PDB_VariantType::UInt64:
  return lldb::eEncodingUint;

default:
  break;
}

return lldb::eEncodingSint;
100}

102static CompilerType
103GetBuiltinTypeForPDBEncodingAndBitSize(TypeSystemClang &clang_ast,
                                     const PDBSymbolTypeBuiltin &pdb_type,
                                     Encoding encoding, uint32_t width) {
clang::ASTContext &ast = clang_ast.getASTContext();

switch (pdb_type.getBuiltinType()) {
default:
  break;
case PDB_BuiltinType::None:
  return CompilerType();
case PDB_BuiltinType::Void:
  return clang_ast.GetBasicType(eBasicTypeVoid);
case PDB_BuiltinType::Char:
  return clang_ast.GetBasicType(eBasicTypeChar);
case PDB_BuiltinType::Bool:
  return clang_ast.GetBasicType(eBasicTypeBool);
case PDB_BuiltinType::Long:
  if (width == ast.getTypeSize(ast.LongTy))
    return CompilerType(&clang_ast, ast.LongTy.getAsOpaquePtr());
  if (width == ast.getTypeSize(ast.LongLongTy))
    return CompilerType(&clang_ast, ast.LongLongTy.getAsOpaquePtr());
  break;
case PDB_BuiltinType::ULong:
  if (width == ast.getTypeSize(ast.UnsignedLongTy))
    return CompilerType(&clang_ast, ast.UnsignedLongTy.getAsOpaquePtr());
  if (width == ast.getTypeSize(ast.UnsignedLongLongTy))
    return CompilerType(&clang_ast, ast.UnsignedLongLongTy.getAsOpaquePtr());
  break;
case PDB_BuiltinType::WCharT:
  if (width == ast.getTypeSize(ast.WCharTy))
    return CompilerType(&clang_ast, ast.WCharTy.getAsOpaquePtr());
  break;
case PDB_BuiltinType::Char16:
  return CompilerType(&clang_ast, ast.Char16Ty.getAsOpaquePtr());
case PDB_BuiltinType::Char32:
  return CompilerType(&clang_ast, ast.Char32Ty.getAsOpaquePtr());
case PDB_BuiltinType::Float:
  // Note: types `long double` and `double` have same bit size in MSVC and
  // there is no information in the PDB to distinguish them. So when falling
  // back to default search, the compiler type of `long double` will be
  // represented by the one generated for `double`.
  break;
}
// If there is no match on PDB_BuiltinType, fall back to default search by
// encoding and width only
return clang_ast.GetBuiltinTypeForEncodingAndBitSize(encoding, width);
149}

151static ConstString GetPDBBuiltinTypeName(const PDBSymbolTypeBuiltin &pdb_type,
                                       CompilerType &compiler_type) {
PDB_BuiltinType kind = pdb_type.getBuiltinType();
switch (kind) {
default:
  break;
case PDB_BuiltinType::Currency:
  return ConstString("CURRENCY");
case PDB_BuiltinType::Date:
  return ConstString("DATE");
case PDB_BuiltinType::Variant:
  return ConstString("VARIANT");
case PDB_BuiltinType::Complex:
  return ConstString("complex");
case PDB_BuiltinType::Bitfield:
  return ConstString("bitfield");
case PDB_BuiltinType::BSTR:
  return ConstString("BSTR");
case PDB_BuiltinType::HResult:
  return ConstString("HRESULT");
case PDB_BuiltinType::BCD:
  return ConstString("BCD");
case PDB_BuiltinType::Char16:
  return ConstString("char16_t");
case PDB_BuiltinType::Char32:
  return ConstString("char32_t");
case PDB_BuiltinType::None:
  return ConstString("...");
}
return compiler_type.GetTypeName();
181}

183static bool GetDeclarationForSymbol(const PDBSymbol &symbol,
                                  Declaration &decl) {
auto &raw_sym = symbol.getRawSymbol();
auto first_line_up = raw_sym.getSrcLineOnTypeDefn();

if (!first_line_up) {
  auto lines_up = symbol.getSession().findLineNumbersByAddress(
      raw_sym.getVirtualAddress(), raw_sym.getLength());
  if (!lines_up)
    return false;
  first_line_up = lines_up->getNext();
  if (!first_line_up)
    return false;
}
uint32_t src_file_id = first_line_up->getSourceFileId();
auto src_file_up = symbol.getSession().getSourceFileById(src_file_id);
if (!src_file_up)
  return false;

FileSpec spec(src_file_up->getFileName());
decl.SetFile(spec);
decl.SetColumn(first_line_up->getColumnNumber());
decl.SetLine(first_line_up->getLineNumber());
return true;
207}

209static AccessType TranslateMemberAccess(PDB_MemberAccess access) {
switch (access) {
case PDB_MemberAccess::Private:
  return eAccessPrivate;
case PDB_MemberAccess::Protected:
  return eAccessProtected;
case PDB_MemberAccess::Public:
  return eAccessPublic;
}
return eAccessNone;
219}

221static AccessType GetDefaultAccessibilityForUdtKind(PDB_UdtType udt_kind) {
switch (udt_kind) {
case PDB_UdtType::Struct:
case PDB_UdtType::Union:
  return eAccessPublic;
case PDB_UdtType::Class:
case PDB_UdtType::Interface:
  return eAccessPrivate;
}
llvm_unreachable("unsupported PDB UDT type")__builtin_unreachable();
231}

233static AccessType GetAccessibilityForUdt(const PDBSymbolTypeUDT &udt) {
AccessType access = TranslateMemberAccess(udt.getAccess());
if (access != lldb::eAccessNone || !udt.isNested())
  return access;

auto parent = udt.getClassParent();
if (!parent)
  return lldb::eAccessNone;

auto parent_udt = llvm::dyn_cast<PDBSymbolTypeUDT>(parent.get());
if (!parent_udt)
  return lldb::eAccessNone;

return GetDefaultAccessibilityForUdtKind(parent_udt->getUdtKind());
247}

249static clang::MSInheritanceAttr::Spelling
250GetMSInheritance(const PDBSymbolTypeUDT &udt) {
int base_count = 0;
bool has_virtual = false;

auto bases_enum = udt.findAllChildren<PDBSymbolTypeBaseClass>();
if (bases_enum) {
  while (auto base = bases_enum->getNext()) {
    base_count++;
    has_virtual |= base->isVirtualBaseClass();
  }
}

if (has_virtual)
  return clang::MSInheritanceAttr::Keyword_virtual_inheritance;
if (base_count > 1)
  return clang::MSInheritanceAttr::Keyword_multiple_inheritance;
return clang::MSInheritanceAttr::Keyword_single_inheritance;
267}

269static std::unique_ptr<llvm::pdb::PDBSymbol>
270GetClassOrFunctionParent(const llvm::pdb::PDBSymbol &symbol) {
const IPDBSession &session = symbol.getSession();
const IPDBRawSymbol &raw = symbol.getRawSymbol();
auto tag = symbol.getSymTag();

// For items that are nested inside of a class, return the class that it is
// nested inside of.
// Note that only certain items can be nested inside of classes.
switch (tag) {
case PDB_SymType::Function:
case PDB_SymType::Data:
case PDB_SymType::UDT:
case PDB_SymType::Enum:
case PDB_SymType::FunctionSig:
case PDB_SymType::Typedef:
case PDB_SymType::BaseClass:
case PDB_SymType::VTable: {
  auto class_parent_id = raw.getClassParentId();
  if (auto class_parent = session.getSymbolById(class_parent_id))
    return class_parent;
  break;
}
default:
  break;
}

// Otherwise, if it is nested inside of a function, return the function.
// Note that only certain items can be nested inside of functions.
switch (tag) {
case PDB_SymType::Block:
case PDB_SymType::Data: {
  auto lexical_parent_id = raw.getLexicalParentId();
  auto lexical_parent = session.getSymbolById(lexical_parent_id);
  if (!lexical_parent)
    return nullptr;

  auto lexical_parent_tag = lexical_parent->getSymTag();
  if (lexical_parent_tag == PDB_SymType::Function)
    return lexical_parent;
  if (lexical_parent_tag == PDB_SymType::Exe)
    return nullptr;

  return GetClassOrFunctionParent(*lexical_parent);
}
default:
  return nullptr;
}
317}

319static clang::NamedDecl *
320GetDeclFromContextByName(const clang::ASTContext &ast,
                       const clang::DeclContext &decl_context,
                       llvm::StringRef name) {
clang::IdentifierInfo &ident = ast.Idents.get(name);
clang::DeclarationName decl_name = ast.DeclarationNames.getIdentifier(&ident);
clang::DeclContext::lookup_result result = decl_context.lookup(decl_name);
if (result.empty())
  return nullptr;

return *result.begin();
330}

332static bool IsAnonymousNamespaceName(llvm::StringRef name) {
return name == "`anonymous namespace'" || name == "`anonymous-namespace'";
334}

336static clang::CallingConv TranslateCallingConvention(PDB_CallingConv pdb_cc) {
switch (pdb_cc) {
case llvm::codeview::CallingConvention::NearC:
  return clang::CC_C;
case llvm::codeview::CallingConvention::NearStdCall:
  return clang::CC_X86StdCall;
case llvm::codeview::CallingConvention::NearFast:
  return clang::CC_X86FastCall;
case llvm::codeview::CallingConvention::ThisCall:
  return clang::CC_X86ThisCall;
case llvm::codeview::CallingConvention::NearVector:
  return clang::CC_X86VectorCall;
case llvm::codeview::CallingConvention::NearPascal:
  return clang::CC_X86Pascal;
default:
  assert(false && "Unknown calling convention")((void)0);
  return clang::CC_C;
}
354}

356PDBASTParser::PDBASTParser(lldb_private::TypeSystemClang &ast) : m_ast(ast) {}

358PDBASTParser::~PDBASTParser() = default;

360// DebugInfoASTParser interface

362lldb::TypeSP PDBASTParser::CreateLLDBTypeFromPDBType(const PDBSymbol &type) {
Declaration decl;
switch (type.getSymTag()) {
1
Control jumps to 'case Typedef:'  at line 533→
case PDB_SymType::BaseClass: {
  auto symbol_file = m_ast.GetSymbolFile();
  if (!symbol_file)
    return nullptr;

  auto ty = symbol_file->ResolveTypeUID(type.getRawSymbol().getTypeId());
  return ty ? ty->shared_from_this() : nullptr;
} break;
case PDB_SymType::UDT: {
  auto udt = llvm::dyn_cast<PDBSymbolTypeUDT>(&type);
  assert(udt)((void)0);

  // Note that, unnamed UDT being typedef-ed is generated as a UDT symbol
  // other than a Typedef symbol in PDB. For example,
  //    typedef union { short Row; short Col; } Union;
  // is generated as a named UDT in PDB:
  //    union Union { short Row; short Col; }
  // Such symbols will be handled here.

  // Some UDT with trival ctor has zero length. Just ignore.
  if (udt->getLength() == 0)
    return nullptr;

  // Ignore unnamed-tag UDTs.
  std::string name =
      std::string(MSVCUndecoratedNameParser::DropScope(udt->getName()));
  if (name.empty())
    return nullptr;

  auto decl_context = GetDeclContextContainingSymbol(type);

  // Check if such an UDT already exists in the current context.
  // This may occur with const or volatile types. There are separate type
  // symbols in PDB for types with const or volatile modifiers, but we need
  // to create only one declaration for them all.
  Type::ResolveState type_resolve_state;
  CompilerType clang_type = m_ast.GetTypeForIdentifier<clang::CXXRecordDecl>(
      ConstString(name), decl_context);
  if (!clang_type.IsValid()) {
    auto access = GetAccessibilityForUdt(*udt);

    auto tag_type_kind = TranslateUdtKind(udt->getUdtKind());

    ClangASTMetadata metadata;
    metadata.SetUserID(type.getSymIndexId());
    metadata.SetIsDynamicCXXType(false);

    clang_type = m_ast.CreateRecordType(
        decl_context, OptionalClangModuleID(), access, name, tag_type_kind,
        lldb::eLanguageTypeC_plus_plus, &metadata);
    assert(clang_type.IsValid())((void)0);

    auto record_decl =
        m_ast.GetAsCXXRecordDecl(clang_type.GetOpaqueQualType());
    assert(record_decl)((void)0);
    m_uid_to_decl[type.getSymIndexId()] = record_decl;

    auto inheritance_attr = clang::MSInheritanceAttr::CreateImplicit(
        m_ast.getASTContext(), GetMSInheritance(*udt));
    record_decl->addAttr(inheritance_attr);

    TypeSystemClang::StartTagDeclarationDefinition(clang_type);

    auto children = udt->findAllChildren();
    if (!children || children->getChildCount() == 0) {
      // PDB does not have symbol of forwarder. We assume we get an udt w/o
      // any fields. Just complete it at this point.
      TypeSystemClang::CompleteTagDeclarationDefinition(clang_type);

      TypeSystemClang::SetHasExternalStorage(clang_type.GetOpaqueQualType(),
                                             false);

      type_resolve_state = Type::ResolveState::Full;
    } else {
      // Add the type to the forward declarations. It will help us to avoid
      // an endless recursion in CompleteTypeFromUdt function.
      m_forward_decl_to_uid[record_decl] = type.getSymIndexId();

      TypeSystemClang::SetHasExternalStorage(clang_type.GetOpaqueQualType(),
                                             true);

      type_resolve_state = Type::ResolveState::Forward;
    }
  } else
    type_resolve_state = Type::ResolveState::Forward;

  if (udt->isConstType())
    clang_type = clang_type.AddConstModifier();

  if (udt->isVolatileType())
    clang_type = clang_type.AddVolatileModifier();

  GetDeclarationForSymbol(type, decl);
  return std::make_shared<lldb_private::Type>(
      type.getSymIndexId(), m_ast.GetSymbolFile(), ConstString(name),
      udt->getLength(), nullptr, LLDB_INVALID_UID0xffffffffffffffffULL,
      lldb_private::Type::eEncodingIsUID, decl, clang_type,
      type_resolve_state);
} break;
case PDB_SymType::Enum: {
  auto enum_type = llvm::dyn_cast<PDBSymbolTypeEnum>(&type);
  assert(enum_type)((void)0);

  std::string name =
      std::string(MSVCUndecoratedNameParser::DropScope(enum_type->getName()));
  auto decl_context = GetDeclContextContainingSymbol(type);
  uint64_t bytes = enum_type->getLength();

  // Check if such an enum already exists in the current context
  CompilerType ast_enum = m_ast.GetTypeForIdentifier<clang::EnumDecl>(
      ConstString(name), decl_context);
  if (!ast_enum.IsValid()) {
    auto underlying_type_up = enum_type->getUnderlyingType();
    if (!underlying_type_up)
      return nullptr;

    lldb::Encoding encoding =
        TranslateBuiltinEncoding(underlying_type_up->getBuiltinType());
    // FIXME: Type of underlying builtin is always `Int`. We correct it with
    // the very first enumerator's encoding if any.
    auto first_child = enum_type->findOneChild<PDBSymbolData>();
    if (first_child)
      encoding = TranslateEnumEncoding(first_child->getValue().Type);

    CompilerType builtin_type;
    if (bytes > 0)
      builtin_type = GetBuiltinTypeForPDBEncodingAndBitSize(
          m_ast, *underlying_type_up, encoding, bytes * 8);
    else
      builtin_type = m_ast.GetBasicType(eBasicTypeInt);

    // FIXME: PDB does not have information about scoped enumeration (Enum
    // Class). Set it false for now.
    bool isScoped = false;

    ast_enum = m_ast.CreateEnumerationType(name.c_str(), decl_context,
                                           OptionalClangModuleID(), decl,
                                           builtin_type, isScoped);

    auto enum_decl = TypeSystemClang::GetAsEnumDecl(ast_enum);
    assert(enum_decl)((void)0);
    m_uid_to_decl[type.getSymIndexId()] = enum_decl;

    auto enum_values = enum_type->findAllChildren<PDBSymbolData>();
    if (enum_values) {
      while (auto enum_value = enum_values->getNext()) {
        if (enum_value->getDataKind() != PDB_DataKind::Constant)
          continue;
        AddEnumValue(ast_enum, *enum_value);
      }
    }

    if (TypeSystemClang::StartTagDeclarationDefinition(ast_enum))
      TypeSystemClang::CompleteTagDeclarationDefinition(ast_enum);
  }

  if (enum_type->isConstType())
    ast_enum = ast_enum.AddConstModifier();

  if (enum_type->isVolatileType())
    ast_enum = ast_enum.AddVolatileModifier();

  GetDeclarationForSymbol(type, decl);
  return std::make_shared<lldb_private::Type>(
      type.getSymIndexId(), m_ast.GetSymbolFile(), ConstString(name), bytes,
      nullptr, LLDB_INVALID_UID0xffffffffffffffffULL, lldb_private::Type::eEncodingIsUID, decl,
      ast_enum, lldb_private::Type::ResolveState::Full);
} break;
case PDB_SymType::Typedef: {
  auto type_def = llvm::dyn_cast<PDBSymbolTypeTypedef>(&type);
2
←
Assuming the object is not a 'PDBSymbolTypeTypedef'→
3
←
'type_def' initialized to a null pointer value→
  assert(type_def)((void)0);

  SymbolFile *symbol_file = m_ast.GetSymbolFile();
  if (!symbol_file)
4
←
Assuming 'symbol_file' is non-null→
5
←
Taking false branch→
    return nullptr;

  lldb_private::Type *target_type =
      symbol_file->ResolveTypeUID(type_def->getTypeId());
6
←
Called C++ object pointer is null
  if (!target_type)
    return nullptr;

  std::string name =
      std::string(MSVCUndecoratedNameParser::DropScope(type_def->getName()));
  auto decl_ctx = GetDeclContextContainingSymbol(type);

  // Check if such a typedef already exists in the current context
  CompilerType ast_typedef =
      m_ast.GetTypeForIdentifier<clang::TypedefNameDecl>(ConstString(name),
                                                         decl_ctx);
  if (!ast_typedef.IsValid()) {
    CompilerType target_ast_type = target_type->GetFullCompilerType();

    ast_typedef = target_ast_type.CreateTypedef(
        name.c_str(), m_ast.CreateDeclContext(decl_ctx), 0);
    if (!ast_typedef)
      return nullptr;

    auto typedef_decl = TypeSystemClang::GetAsTypedefDecl(ast_typedef);
    assert(typedef_decl)((void)0);
    m_uid_to_decl[type.getSymIndexId()] = typedef_decl;
  }

  if (type_def->isConstType())
    ast_typedef = ast_typedef.AddConstModifier();

  if (type_def->isVolatileType())
    ast_typedef = ast_typedef.AddVolatileModifier();

  GetDeclarationForSymbol(type, decl);
  llvm::Optional<uint64_t> size;
  if (type_def->getLength())
    size = type_def->getLength();
  return std::make_shared<lldb_private::Type>(
      type_def->getSymIndexId(), m_ast.GetSymbolFile(), ConstString(name),
      size, nullptr, target_type->GetID(),
      lldb_private::Type::eEncodingIsTypedefUID, decl, ast_typedef,
      lldb_private::Type::ResolveState::Full);
} break;
case PDB_SymType::Function:
case PDB_SymType::FunctionSig: {
  std::string name;
  PDBSymbolTypeFunctionSig *func_sig = nullptr;
  if (auto pdb_func = llvm::dyn_cast<PDBSymbolFunc>(&type)) {
    if (pdb_func->isCompilerGenerated())
      return nullptr;

    auto sig = pdb_func->getSignature();
    if (!sig)
      return nullptr;
    func_sig = sig.release();
    // Function type is named.
    name = std::string(
        MSVCUndecoratedNameParser::DropScope(pdb_func->getName()));
  } else if (auto pdb_func_sig =
                 llvm::dyn_cast<PDBSymbolTypeFunctionSig>(&type)) {
    func_sig = const_cast<PDBSymbolTypeFunctionSig *>(pdb_func_sig);
  } else
    llvm_unreachable("Unexpected PDB symbol!")__builtin_unreachable();

  auto arg_enum = func_sig->getArguments();
  uint32_t num_args = arg_enum->getChildCount();
  std::vector<CompilerType> arg_list;

  bool is_variadic = func_sig->isCVarArgs();
  // Drop last variadic argument.
  if (is_variadic)
    --num_args;
  for (uint32_t arg_idx = 0; arg_idx < num_args; arg_idx++) {
    auto arg = arg_enum->getChildAtIndex(arg_idx);
    if (!arg)
      break;

    SymbolFile *symbol_file = m_ast.GetSymbolFile();
    if (!symbol_file)
      return nullptr;

    lldb_private::Type *arg_type =
        symbol_file->ResolveTypeUID(arg->getSymIndexId());
    // If there's some error looking up one of the dependent types of this
    // function signature, bail.
    if (!arg_type)
      return nullptr;
    CompilerType arg_ast_type = arg_type->GetFullCompilerType();
    arg_list.push_back(arg_ast_type);
  }
  lldbassert(arg_list.size() <= num_args)lldb_private::lldb_assert(static_cast<bool>(arg_list.size
() <= num_args), "arg_list.size() <= num_args", __FUNCTION__
, "/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, 630);

  auto pdb_return_type = func_sig->getReturnType();
  SymbolFile *symbol_file = m_ast.GetSymbolFile();
  if (!symbol_file)
    return nullptr;

  lldb_private::Type *return_type =
      symbol_file->ResolveTypeUID(pdb_return_type->getSymIndexId());
  // If there's some error looking up one of the dependent types of this
  // function signature, bail.
  if (!return_type)
    return nullptr;
  CompilerType return_ast_type = return_type->GetFullCompilerType();
  uint32_t type_quals = 0;
  if (func_sig->isConstType())
    type_quals |= clang::Qualifiers::Const;
  if (func_sig->isVolatileType())
    type_quals |= clang::Qualifiers::Volatile;
  auto cc = TranslateCallingConvention(func_sig->getCallingConvention());
  CompilerType func_sig_ast_type =
      m_ast.CreateFunctionType(return_ast_type, arg_list.data(),
                               arg_list.size(), is_variadic, type_quals, cc);

  GetDeclarationForSymbol(type, decl);
  return std::make_shared<lldb_private::Type>(
      type.getSymIndexId(), m_ast.GetSymbolFile(), ConstString(name),
      llvm::None, nullptr, LLDB_INVALID_UID0xffffffffffffffffULL,
      lldb_private::Type::eEncodingIsUID, decl, func_sig_ast_type,
      lldb_private::Type::ResolveState::Full);
} break;
case PDB_SymType::ArrayType: {
  auto array_type = llvm::dyn_cast<PDBSymbolTypeArray>(&type);
  assert(array_type)((void)0);
  uint32_t num_elements = array_type->getCount();
  uint32_t element_uid = array_type->getElementTypeId();
  llvm::Optional<uint64_t> bytes;
  if (uint64_t size = array_type->getLength())
    bytes = size;

  SymbolFile *symbol_file = m_ast.GetSymbolFile();
  if (!symbol_file)
    return nullptr;

  // If array rank > 0, PDB gives the element type at N=0. So element type
  // will parsed in the order N=0, N=1,..., N=rank sequentially.
  lldb_private::Type *element_type = symbol_file->ResolveTypeUID(element_uid);
  if (!element_type)
    return nullptr;

  CompilerType element_ast_type = element_type->GetForwardCompilerType();
  // If element type is UDT, it needs to be complete.
  if (TypeSystemClang::IsCXXClassType(element_ast_type) &&
      !element_ast_type.GetCompleteType()) {
    if (TypeSystemClang::StartTagDeclarationDefinition(element_ast_type)) {
      TypeSystemClang::CompleteTagDeclarationDefinition(element_ast_type);
    } else {
      // We are not able to start defintion.
      return nullptr;
    }
  }
  CompilerType array_ast_type = m_ast.CreateArrayType(
      element_ast_type, num_elements, /*is_gnu_vector*/ false);
  TypeSP type_sp = std::make_shared<lldb_private::Type>(
      array_type->getSymIndexId(), m_ast.GetSymbolFile(), ConstString(),
      bytes, nullptr, LLDB_INVALID_UID0xffffffffffffffffULL, lldb_private::Type::eEncodingIsUID,
      decl, array_ast_type, lldb_private::Type::ResolveState::Full);
  type_sp->SetEncodingType(element_type);
  return type_sp;
} break;
case PDB_SymType::BuiltinType: {
  auto *builtin_type = llvm::dyn_cast<PDBSymbolTypeBuiltin>(&type);
  assert(builtin_type)((void)0);
  PDB_BuiltinType builtin_kind = builtin_type->getBuiltinType();
  if (builtin_kind == PDB_BuiltinType::None)
    return nullptr;

  llvm::Optional<uint64_t> bytes;
  if (uint64_t size = builtin_type->getLength())
    bytes = size;
  Encoding encoding = TranslateBuiltinEncoding(builtin_kind);
  CompilerType builtin_ast_type = GetBuiltinTypeForPDBEncodingAndBitSize(
      m_ast, *builtin_type, encoding, bytes.getValueOr(0) * 8);

  if (builtin_type->isConstType())
    builtin_ast_type = builtin_ast_type.AddConstModifier();

  if (builtin_type->isVolatileType())
    builtin_ast_type = builtin_ast_type.AddVolatileModifier();

  auto type_name = GetPDBBuiltinTypeName(*builtin_type, builtin_ast_type);

  return std::make_shared<lldb_private::Type>(
      builtin_type->getSymIndexId(), m_ast.GetSymbolFile(), type_name, bytes,
      nullptr, LLDB_INVALID_UID0xffffffffffffffffULL, lldb_private::Type::eEncodingIsUID, decl,
      builtin_ast_type, lldb_private::Type::ResolveState::Full);
} break;
case PDB_SymType::PointerType: {
  auto *pointer_type = llvm::dyn_cast<PDBSymbolTypePointer>(&type);
  assert(pointer_type)((void)0);

  SymbolFile *symbol_file = m_ast.GetSymbolFile();
  if (!symbol_file)
    return nullptr;

  Type *pointee_type = symbol_file->ResolveTypeUID(
      pointer_type->getPointeeType()->getSymIndexId());
  if (!pointee_type)
    return nullptr;

  if (pointer_type->isPointerToDataMember() ||
      pointer_type->isPointerToMemberFunction()) {
    auto class_parent_uid = pointer_type->getRawSymbol().getClassParentId();
    auto class_parent_type = symbol_file->ResolveTypeUID(class_parent_uid);
    assert(class_parent_type)((void)0);

    CompilerType pointer_ast_type;
    pointer_ast_type = TypeSystemClang::CreateMemberPointerType(
        class_parent_type->GetLayoutCompilerType(),
        pointee_type->GetForwardCompilerType());
    assert(pointer_ast_type)((void)0);

    return std::make_shared<lldb_private::Type>(
        pointer_type->getSymIndexId(), m_ast.GetSymbolFile(), ConstString(),
        pointer_type->getLength(), nullptr, LLDB_INVALID_UID0xffffffffffffffffULL,
        lldb_private::Type::eEncodingIsUID, decl, pointer_ast_type,
        lldb_private::Type::ResolveState::Forward);
  }

  CompilerType pointer_ast_type;
  pointer_ast_type = pointee_type->GetFullCompilerType();
  if (pointer_type->isReference())
    pointer_ast_type = pointer_ast_type.GetLValueReferenceType();
  else if (pointer_type->isRValueReference())
    pointer_ast_type = pointer_ast_type.GetRValueReferenceType();
  else
    pointer_ast_type = pointer_ast_type.GetPointerType();

  if (pointer_type->isConstType())
    pointer_ast_type = pointer_ast_type.AddConstModifier();

  if (pointer_type->isVolatileType())
    pointer_ast_type = pointer_ast_type.AddVolatileModifier();

  if (pointer_type->isRestrictedType())
    pointer_ast_type = pointer_ast_type.AddRestrictModifier();

  return std::make_shared<lldb_private::Type>(
      pointer_type->getSymIndexId(), m_ast.GetSymbolFile(), ConstString(),
      pointer_type->getLength(), nullptr, LLDB_INVALID_UID0xffffffffffffffffULL,
      lldb_private::Type::eEncodingIsUID, decl, pointer_ast_type,
      lldb_private::Type::ResolveState::Full);
} break;
default:
  break;
}
return nullptr;
787}

789bool PDBASTParser::CompleteTypeFromPDB(
  lldb_private::CompilerType &compiler_type) {
if (GetClangASTImporter().CanImport(compiler_type))
  return GetClangASTImporter().CompleteType(compiler_type);

// Remove the type from the forward declarations to avoid
// an endless recursion for types like a linked list.
clang::CXXRecordDecl *record_decl =
    m_ast.GetAsCXXRecordDecl(compiler_type.GetOpaqueQualType());
auto uid_it = m_forward_decl_to_uid.find(record_decl);
if (uid_it == m_forward_decl_to_uid.end())
  return true;

auto symbol_file = static_cast<SymbolFilePDB *>(m_ast.GetSymbolFile());
if (!symbol_file)
  return false;

std::unique_ptr<PDBSymbol> symbol =
    symbol_file->GetPDBSession().getSymbolById(uid_it->getSecond());
if (!symbol)
  return false;

m_forward_decl_to_uid.erase(uid_it);

TypeSystemClang::SetHasExternalStorage(compiler_type.GetOpaqueQualType(),
                                       false);

switch (symbol->getSymTag()) {
case PDB_SymType::UDT: {
  auto udt = llvm::dyn_cast<PDBSymbolTypeUDT>(symbol.get());
  if (!udt)
    return false;

  return CompleteTypeFromUDT(*symbol_file, compiler_type, *udt);
}
default:
  llvm_unreachable("not a forward clang type decl!")__builtin_unreachable();
}
827}

829clang::Decl *
830PDBASTParser::GetDeclForSymbol(const llvm::pdb::PDBSymbol &symbol) {
uint32_t sym_id = symbol.getSymIndexId();
auto it = m_uid_to_decl.find(sym_id);
if (it != m_uid_to_decl.end())
  return it->second;

auto symbol_file = static_cast<SymbolFilePDB *>(m_ast.GetSymbolFile());
if (!symbol_file)
  return nullptr;

// First of all, check if the symbol is a member of a class. Resolve the full
// class type and return the declaration from the cache if so.
auto tag = symbol.getSymTag();
if (tag == PDB_SymType::Data || tag == PDB_SymType::Function) {
  const IPDBSession &session = symbol.getSession();
  const IPDBRawSymbol &raw = symbol.getRawSymbol();

  auto class_parent_id = raw.getClassParentId();
  if (std::unique_ptr<PDBSymbol> class_parent =
          session.getSymbolById(class_parent_id)) {
    auto class_parent_type = symbol_file->ResolveTypeUID(class_parent_id);
    if (!class_parent_type)
      return nullptr;

    CompilerType class_parent_ct = class_parent_type->GetFullCompilerType();

    // Look a declaration up in the cache after completing the class
    clang::Decl *decl = m_uid_to_decl.lookup(sym_id);
    if (decl)
      return decl;

    // A declaration was not found in the cache. It means that the symbol
    // has the class parent, but the class doesn't have the symbol in its
    // children list.
    if (auto func = llvm::dyn_cast_or_null<PDBSymbolFunc>(&symbol)) {
      // Try to find a class child method with the same RVA and use its
      // declaration if found.
      if (uint32_t rva = func->getRelativeVirtualAddress()) {
        if (std::unique_ptr<ConcreteSymbolEnumerator<PDBSymbolFunc>>
                methods_enum =
                    class_parent->findAllChildren<PDBSymbolFunc>()) {
          while (std::unique_ptr<PDBSymbolFunc> method =
                     methods_enum->getNext()) {
            if (method->getRelativeVirtualAddress() == rva) {
              decl = m_uid_to_decl.lookup(method->getSymIndexId());
              if (decl)
                break;
            }
          }
        }
      }

      // If no class methods with the same RVA were found, then create a new
      // method. It is possible for template methods.
      if (!decl)
        decl = AddRecordMethod(*symbol_file, class_parent_ct, *func);
    }

    if (decl)
      m_uid_to_decl[sym_id] = decl;

    return decl;
  }
}

// If we are here, then the symbol is not belonging to a class and is not
// contained in the cache. So create a declaration for it.
switch (symbol.getSymTag()) {
case PDB_SymType::Data: {
  auto data = llvm::dyn_cast<PDBSymbolData>(&symbol);
  assert(data)((void)0);

  auto decl_context = GetDeclContextContainingSymbol(symbol);
  assert(decl_context)((void)0);

  // May be the current context is a class really, but we haven't found
  // any class parent. This happens e.g. in the case of class static
  // variables - they has two symbols, one is a child of the class when
  // another is a child of the exe. So always complete the parent and use
  // an existing declaration if possible.
  if (auto parent_decl = llvm::dyn_cast_or_null<clang::TagDecl>(decl_context))
    m_ast.GetCompleteDecl(parent_decl);

  std::string name =
      std::string(MSVCUndecoratedNameParser::DropScope(data->getName()));

  // Check if the current context already contains the symbol with the name.
  clang::Decl *decl =
      GetDeclFromContextByName(m_ast.getASTContext(), *decl_context, name);
  if (!decl) {
    auto type = symbol_file->ResolveTypeUID(data->getTypeId());
    if (!type)
      return nullptr;

    decl = m_ast.CreateVariableDeclaration(
        decl_context, OptionalClangModuleID(), name.c_str(),
        ClangUtil::GetQualType(type->GetLayoutCompilerType()));
  }

  m_uid_to_decl[sym_id] = decl;

  return decl;
}
case PDB_SymType::Function: {
  auto func = llvm::dyn_cast<PDBSymbolFunc>(&symbol);
  assert(func)((void)0);

  auto decl_context = GetDeclContextContainingSymbol(symbol);
  assert(decl_context)((void)0);

  std::string name =
      std::string(MSVCUndecoratedNameParser::DropScope(func->getName()));

  Type *type = symbol_file->ResolveTypeUID(sym_id);
  if (!type)
    return nullptr;

  auto storage = func->isStatic() ? clang::StorageClass::SC_Static
                                  : clang::StorageClass::SC_None;

  auto decl = m_ast.CreateFunctionDeclaration(
      decl_context, OptionalClangModuleID(), name,
      type->GetForwardCompilerType(), storage, func->hasInlineAttribute());

  std::vector<clang::ParmVarDecl *> params;
  if (std::unique_ptr<PDBSymbolTypeFunctionSig> sig = func->getSignature()) {
    if (std::unique_ptr<ConcreteSymbolEnumerator<PDBSymbolTypeFunctionArg>>
            arg_enum = sig->findAllChildren<PDBSymbolTypeFunctionArg>()) {
      while (std::unique_ptr<PDBSymbolTypeFunctionArg> arg =
                 arg_enum->getNext()) {
        Type *arg_type = symbol_file->ResolveTypeUID(arg->getTypeId());
        if (!arg_type)
          continue;

        clang::ParmVarDecl *param = m_ast.CreateParameterDeclaration(
            decl, OptionalClangModuleID(), nullptr,
            arg_type->GetForwardCompilerType(), clang::SC_None, true);
        if (param)
          params.push_back(param);
      }
    }
  }
  if (params.size())
    m_ast.SetFunctionParameters(decl, params);

  m_uid_to_decl[sym_id] = decl;

  return decl;
}
default: {
  // It's not a variable and not a function, check if it's a type
  Type *type = symbol_file->ResolveTypeUID(sym_id);
  if (!type)
    return nullptr;

  return m_uid_to_decl.lookup(sym_id);
}
}
988}

990clang::DeclContext *
991PDBASTParser::GetDeclContextForSymbol(const llvm::pdb::PDBSymbol &symbol) {
if (symbol.getSymTag() == PDB_SymType::Function) {
  clang::DeclContext *result =
      llvm::dyn_cast_or_null<clang::FunctionDecl>(GetDeclForSymbol(symbol));

  if (result)
    m_decl_context_to_uid[result] = symbol.getSymIndexId();

  return result;
}

auto symbol_file = static_cast<SymbolFilePDB *>(m_ast.GetSymbolFile());
if (!symbol_file)
  return nullptr;

auto type = symbol_file->ResolveTypeUID(symbol.getSymIndexId());
if (!type)
  return nullptr;

clang::DeclContext *result =
    m_ast.GetDeclContextForType(type->GetForwardCompilerType());

if (result)
  m_decl_context_to_uid[result] = symbol.getSymIndexId();

return result;
1017}

1019clang::DeclContext *PDBASTParser::GetDeclContextContainingSymbol(
  const llvm::pdb::PDBSymbol &symbol) {
auto parent = GetClassOrFunctionParent(symbol);
while (parent) {
  if (auto parent_context = GetDeclContextForSymbol(*parent))
    return parent_context;

  parent = GetClassOrFunctionParent(*parent);
}

// We can't find any class or function parent of the symbol. So analyze
// the full symbol name. The symbol may be belonging to a namespace
// or function (or even to a class if it's e.g. a static variable symbol).

// TODO: Make clang to emit full names for variables in namespaces
// (as MSVC does)

std::string name(symbol.getRawSymbol().getName());
MSVCUndecoratedNameParser parser(name);
llvm::ArrayRef<MSVCUndecoratedNameSpecifier> specs = parser.GetSpecifiers();
if (specs.empty())
  return m_ast.GetTranslationUnitDecl();

auto symbol_file = static_cast<SymbolFilePDB *>(m_ast.GetSymbolFile());
if (!symbol_file)
  return m_ast.GetTranslationUnitDecl();

auto global = symbol_file->GetPDBSession().getGlobalScope();
if (!global)
  return m_ast.GetTranslationUnitDecl();

bool has_type_or_function_parent = false;
clang::DeclContext *curr_context = m_ast.GetTranslationUnitDecl();
for (std::size_t i = 0; i < specs.size() - 1; i++) {
  // Check if there is a function or a type with the current context's name.
  if (std::unique_ptr<IPDBEnumSymbols> children_enum = global->findChildren(
          PDB_SymType::None, specs[i].GetFullName(), NS_CaseSensitive)) {
    while (IPDBEnumChildren<PDBSymbol>::ChildTypePtr child =
               children_enum->getNext()) {
      if (clang::DeclContext *child_context =
              GetDeclContextForSymbol(*child)) {
        // Note that `GetDeclContextForSymbol' retrieves
        // a declaration context for functions and types only,
        // so if we are here then `child_context' is guaranteed
        // a function or a type declaration context.
        has_type_or_function_parent = true;
        curr_context = child_context;
      }
    }
  }

  // If there were no functions or types above then retrieve a namespace with
  // the current context's name. There can be no namespaces inside a function
  // or a type. We check it to avoid fake namespaces such as `__l2':
  // `N0::N1::CClass::PrivateFunc::__l2::InnerFuncStruct'
  if (!has_type_or_function_parent) {
    std::string namespace_name = std::string(specs[i].GetBaseName());
    const char *namespace_name_c_str =
        IsAnonymousNamespaceName(namespace_name) ? nullptr
                                                 : namespace_name.data();
    clang::NamespaceDecl *namespace_decl =
        m_ast.GetUniqueNamespaceDeclaration(
            namespace_name_c_str, curr_context, OptionalClangModuleID());

    m_parent_to_namespaces[curr_context].insert(namespace_decl);
    m_namespaces.insert(namespace_decl);

    curr_context = namespace_decl;
  }
}

return curr_context;
1091}

1093void PDBASTParser::ParseDeclsForDeclContext(
  const clang::DeclContext *decl_context) {
auto symbol_file = static_cast<SymbolFilePDB *>(m_ast.GetSymbolFile());
if (!symbol_file)
  return;

IPDBSession &session = symbol_file->GetPDBSession();
auto symbol_up =
    session.getSymbolById(m_decl_context_to_uid.lookup(decl_context));
auto global_up = session.getGlobalScope();

PDBSymbol *symbol;
if (symbol_up)
  symbol = symbol_up.get();
else if (global_up)
  symbol = global_up.get();
else
  return;

if (auto children = symbol->findAllChildren())
  while (auto child = children->getNext())
    GetDeclForSymbol(*child);
1115}

1117clang::NamespaceDecl *
1118PDBASTParser::FindNamespaceDecl(const clang::DeclContext *parent,
                              llvm::StringRef name) {
NamespacesSet *set;
if (parent) {
  auto pit = m_parent_to_namespaces.find(parent);
  if (pit == m_parent_to_namespaces.end())
    return nullptr;

  set = &pit->second;
} else {
  set = &m_namespaces;
}
assert(set)((void)0);

for (clang::NamespaceDecl *namespace_decl : *set)
  if (namespace_decl->getName().equals(name))
    return namespace_decl;

for (clang::NamespaceDecl *namespace_decl : *set)
  if (namespace_decl->isAnonymousNamespace())
    return FindNamespaceDecl(namespace_decl, name);

return nullptr;
1141}

1143bool PDBASTParser::AddEnumValue(CompilerType enum_type,
                              const PDBSymbolData &enum_value) {
Declaration decl;
Variant v = enum_value.getValue();
std::string name =
    std::string(MSVCUndecoratedNameParser::DropScope(enum_value.getName()));
int64_t raw_value;
switch (v.Type) {
case PDB_VariantType::Int8:
  raw_value = v.Value.Int8;
  break;
case PDB_VariantType::Int16:
  raw_value = v.Value.Int16;
  break;
case PDB_VariantType::Int32:
  raw_value = v.Value.Int32;
  break;
case PDB_VariantType::Int64:
  raw_value = v.Value.Int64;
  break;
case PDB_VariantType::UInt8:
  raw_value = v.Value.UInt8;
  break;
case PDB_VariantType::UInt16:
  raw_value = v.Value.UInt16;
  break;
case PDB_VariantType::UInt32:
  raw_value = v.Value.UInt32;
  break;
case PDB_VariantType::UInt64:
  raw_value = v.Value.UInt64;
  break;
default:
  return false;
}
CompilerType underlying_type = m_ast.GetEnumerationIntegerType(enum_type);
uint32_t byte_size = m_ast.getASTContext().getTypeSize(
    ClangUtil::GetQualType(underlying_type));
auto enum_constant_decl = m_ast.AddEnumerationValueToEnumerationType(
    enum_type, decl, name.c_str(), raw_value, byte_size * 8);
if (!enum_constant_decl)
  return false;

m_uid_to_decl[enum_value.getSymIndexId()] = enum_constant_decl;

return true;
1189}

1191bool PDBASTParser::CompleteTypeFromUDT(
  lldb_private::SymbolFile &symbol_file,
  lldb_private::CompilerType &compiler_type,
  llvm::pdb::PDBSymbolTypeUDT &udt) {
ClangASTImporter::LayoutInfo layout_info;
layout_info.bit_size = udt.getLength() * 8;

auto nested_enums = udt.findAllChildren<PDBSymbolTypeUDT>();
if (nested_enums)
  while (auto nested = nested_enums->getNext())
    symbol_file.ResolveTypeUID(nested->getSymIndexId());

auto bases_enum = udt.findAllChildren<PDBSymbolTypeBaseClass>();
if (bases_enum)
  AddRecordBases(symbol_file, compiler_type,
                 TranslateUdtKind(udt.getUdtKind()), *bases_enum,
                 layout_info);

auto members_enum = udt.findAllChildren<PDBSymbolData>();
if (members_enum)
  AddRecordMembers(symbol_file, compiler_type, *members_enum, layout_info);

auto methods_enum = udt.findAllChildren<PDBSymbolFunc>();
if (methods_enum)
  AddRecordMethods(symbol_file, compiler_type, *methods_enum);

m_ast.AddMethodOverridesForCXXRecordType(compiler_type.GetOpaqueQualType());
TypeSystemClang::BuildIndirectFields(compiler_type);
TypeSystemClang::CompleteTagDeclarationDefinition(compiler_type);

clang::CXXRecordDecl *record_decl =
    m_ast.GetAsCXXRecordDecl(compiler_type.GetOpaqueQualType());
if (!record_decl)
  return static_cast<bool>(compiler_type);

GetClangASTImporter().SetRecordLayout(record_decl, layout_info);

return static_cast<bool>(compiler_type);
1229}

1231void PDBASTParser::AddRecordMembers(
  lldb_private::SymbolFile &symbol_file,
  lldb_private::CompilerType &record_type,
  PDBDataSymbolEnumerator &members_enum,
  lldb_private::ClangASTImporter::LayoutInfo &layout_info) {
while (auto member = members_enum.getNext()) {
  if (member->isCompilerGenerated())
    continue;

  auto member_name = member->getName();

  auto member_type = symbol_file.ResolveTypeUID(member->getTypeId());
  if (!member_type)
    continue;

  auto member_comp_type = member_type->GetLayoutCompilerType();
  if (!member_comp_type.GetCompleteType()) {
    symbol_file.GetObjectFile()->GetModule()->ReportError(
        ":: Class '%s' has a member '%s' of type '%s' "
        "which does not have a complete definition.",
        record_type.GetTypeName().GetCString(), member_name.c_str(),
        member_comp_type.GetTypeName().GetCString());
    if (TypeSystemClang::StartTagDeclarationDefinition(member_comp_type))
      TypeSystemClang::CompleteTagDeclarationDefinition(member_comp_type);
  }

  auto access = TranslateMemberAccess(member->getAccess());

  switch (member->getDataKind()) {
  case PDB_DataKind::Member: {
    auto location_type = member->getLocationType();

    auto bit_size = member->getLength();
    if (location_type == PDB_LocType::ThisRel)
      bit_size *= 8;

    auto decl = TypeSystemClang::AddFieldToRecordType(
        record_type, member_name.c_str(), member_comp_type, access, bit_size);
    if (!decl)
      continue;

    m_uid_to_decl[member->getSymIndexId()] = decl;

    auto offset = member->getOffset() * 8;
    if (location_type == PDB_LocType::BitField)
      offset += member->getBitPosition();

    layout_info.field_offsets.insert(std::make_pair(decl, offset));

    break;
  }
  case PDB_DataKind::StaticMember: {
    auto decl = TypeSystemClang::AddVariableToRecordType(
        record_type, member_name.c_str(), member_comp_type, access);
    if (!decl)
      continue;

    // Static constant members may be a const[expr] declaration.
    // Query the symbol's value as the variable initializer if valid.
    if (member_comp_type.IsConst()) {
      auto value = member->getValue();
      clang::QualType qual_type = decl->getType();
      unsigned type_width = m_ast.getASTContext().getIntWidth(qual_type);
      unsigned constant_width = value.getBitWidth();

      if (qual_type->isIntegralOrEnumerationType()) {
        if (type_width >= constant_width) {
          TypeSystemClang::SetIntegerInitializerForVariable(
              decl, value.toAPSInt().extOrTrunc(type_width));
        } else {
          LLDB_LOG(GetLogIfAllCategoriesSet(LIBLLDB_LOG_AST),do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "
 "which resolves to a wider constant value ({4} bits). " "Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                   "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "
 "which resolves to a wider constant value ({4} bits). " "Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                   "which resolves to a wider constant value ({4} bits). "do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "
 "which resolves to a wider constant value ({4} bits). " "Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                   "Ignoring constant.",do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "
 "which resolves to a wider constant value ({4} bits). " "Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                   record_type.GetTypeName(), member_name,do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "
 "which resolves to a wider constant value ({4} bits). " "Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                   member_comp_type.GetTypeName(), type_width,do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "
 "which resolves to a wider constant value ({4} bits). " "Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                   constant_width)do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} bits) "
 "which resolves to a wider constant value ({4} bits). " "Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0);
        }
      } else {
        switch (member_comp_type.GetBasicTypeEnumeration()) {
        case lldb::eBasicTypeFloat:
        case lldb::eBasicTypeDouble:
        case lldb::eBasicTypeLongDouble:
          if (type_width == constant_width) {
            TypeSystemClang::SetFloatingInitializerForVariable(
                decl, value.toAPFloat());
            decl->setConstexpr(true);
          } else {
            LLDB_LOG(GetLogIfAllCategoriesSet(LIBLLDB_LOG_AST),do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} "
 "bits) which resolves to a constant value of mismatched " "width ({4} bits). Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                     "Class '{0}' has a member '{1}' of type '{2}' ({3} "do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} "
 "bits) which resolves to a constant value of mismatched " "width ({4} bits). Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                     "bits) which resolves to a constant value of mismatched "do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} "
 "bits) which resolves to a constant value of mismatched " "width ({4} bits). Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                     "width ({4} bits). Ignoring constant.",do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} "
 "bits) which resolves to a constant value of mismatched " "width ({4} bits). Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                     record_type.GetTypeName(), member_name,do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} "
 "bits) which resolves to a constant value of mismatched " "width ({4} bits). Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                     member_comp_type.GetTypeName(), type_width,do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} "
 "bits) which resolves to a constant value of mismatched " "width ({4} bits). Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0)
                     constant_width)do { ::lldb_private::Log *log_private = (GetLogIfAllCategoriesSet
((1u << 31))); if (log_private) log_private->Format(
"/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, __func__, "Class '{0}' has a member '{1}' of type '{2}' ({3} "
 "bits) which resolves to a constant value of mismatched " "width ({4} bits). Ignoring constant."
, record_type.GetTypeName(), member_name, member_comp_type.GetTypeName
(), type_width, constant_width); } while (0);
          }
          break;
        default:
          break;
        }
      }
    }

    m_uid_to_decl[member->getSymIndexId()] = decl;

    break;
  }
  default:
    llvm_unreachable("unsupported PDB data kind")__builtin_unreachable();
  }
}
1342}

1344void PDBASTParser::AddRecordBases(
  lldb_private::SymbolFile &symbol_file,
  lldb_private::CompilerType &record_type, int record_kind,
  PDBBaseClassSymbolEnumerator &bases_enum,
  lldb_private::ClangASTImporter::LayoutInfo &layout_info) const {
std::vector<std::unique_ptr<clang::CXXBaseSpecifier>> base_classes;

while (auto base = bases_enum.getNext()) {
  auto base_type = symbol_file.ResolveTypeUID(base->getTypeId());
  if (!base_type)
    continue;

  auto base_comp_type = base_type->GetFullCompilerType();
  if (!base_comp_type.GetCompleteType()) {
    symbol_file.GetObjectFile()->GetModule()->ReportError(
        ":: Class '%s' has a base class '%s' "
        "which does not have a complete definition.",
        record_type.GetTypeName().GetCString(),
        base_comp_type.GetTypeName().GetCString());
    if (TypeSystemClang::StartTagDeclarationDefinition(base_comp_type))
      TypeSystemClang::CompleteTagDeclarationDefinition(base_comp_type);
  }

  auto access = TranslateMemberAccess(base->getAccess());

  auto is_virtual = base->isVirtualBaseClass();

  std::unique_ptr<clang::CXXBaseSpecifier> base_spec =
      m_ast.CreateBaseClassSpecifier(base_comp_type.GetOpaqueQualType(),
                                     access, is_virtual,
                                     record_kind == clang::TTK_Class);
  lldbassert(base_spec)lldb_private::lldb_assert(static_cast<bool>(base_spec),
 "base_spec", __FUNCTION__, "/usr/src/gnu/usr.bin/clang/liblldbPluginSymbolFile/../../../llvm/lldb/source/Plugins/SymbolFile/PDB/PDBASTParser.cpp"
, 1375);

  base_classes.push_back(std::move(base_spec));

  if (is_virtual)
    continue;

  auto decl = m_ast.GetAsCXXRecordDecl(base_comp_type.GetOpaqueQualType());
  if (!decl)
    continue;

  auto offset = clang::CharUnits::fromQuantity(base->getOffset());
  layout_info.base_offsets.insert(std::make_pair(decl, offset));
}

m_ast.TransferBaseClasses(record_type.GetOpaqueQualType(),
                          std::move(base_classes));
1392}

1394void PDBASTParser::AddRecordMethods(lldb_private::SymbolFile &symbol_file,
                                  lldb_private::CompilerType &record_type,
                                  PDBFuncSymbolEnumerator &methods_enum) {
while (std::unique_ptr<PDBSymbolFunc> method = methods_enum.getNext())
  if (clang::CXXMethodDecl *decl =
          AddRecordMethod(symbol_file, record_type, *method))
    m_uid_to_decl[method->getSymIndexId()] = decl;
1401}

1403clang::CXXMethodDecl *
1404PDBASTParser::AddRecordMethod(lldb_private::SymbolFile &symbol_file,
                            lldb_private::CompilerType &record_type,
                            const llvm::pdb::PDBSymbolFunc &method) const {
std::string name =
    std::string(MSVCUndecoratedNameParser::DropScope(method.getName()));

Type *method_type = symbol_file.ResolveTypeUID(method.getSymIndexId());
// MSVC specific __vecDelDtor.
if (!method_type)
  return nullptr;

CompilerType method_comp_type = method_type->GetFullCompilerType();
if (!method_comp_type.GetCompleteType()) {
  symbol_file.GetObjectFile()->GetModule()->ReportError(
      ":: Class '%s' has a method '%s' whose type cannot be completed.",
      record_type.GetTypeName().GetCString(),
      method_comp_type.GetTypeName().GetCString());
  if (TypeSystemClang::StartTagDeclarationDefinition(method_comp_type))
    TypeSystemClang::CompleteTagDeclarationDefinition(method_comp_type);
}

AccessType access = TranslateMemberAccess(method.getAccess());
if (access == eAccessNone)
  access = eAccessPublic;

// TODO: get mangled name for the method.
return m_ast.AddMethodToCXXRecordType(
    record_type.GetOpaqueQualType(), name.c_str(),
    /*mangled_name*/ nullptr, method_comp_type, access, method.isVirtual(),
    method.isStatic(), method.hasInlineAttribute(),
    /*is_explicit*/ false, // FIXME: Need this field in CodeView.
    /*is_attr_used*/ false,
    /*is_artificial*/ method.isCompilerGenerated());
1437}