C++ DWARFDIE::Tag方法代码示例

void
DWARFASTParserGo::ParseChildArrayInfo(const SymbolContext &sc, const DWARFDIE &parent_die, int64_t &first_index,
                                      std::vector<uint64_t> &element_orders, uint32_t &byte_stride,
                                      uint32_t &bit_stride)
{
    if (!parent_die)
        return;

    for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); die = die.GetSibling())
    {
        const dw_tag_t tag = die.Tag();
        switch (tag)
        {
            case DW_TAG_subrange_type:
            {
                DWARFAttributes attributes;
                const size_t num_child_attributes = die.GetAttributes(attributes);
                if (num_child_attributes > 0)
                {
                    uint64_t num_elements = 0;
                    uint32_t i;
                    for (i = 0; i < num_child_attributes; ++i)
                    {
                        const dw_attr_t attr = attributes.AttributeAtIndex(i);
                        DWARFFormValue form_value;
                        if (attributes.ExtractFormValueAtIndex(i, form_value))
                        {
                            switch (attr)
                            {
                                case DW_AT_count:
                                    num_elements = form_value.Unsigned();
                                    break;

                                default:
                                case DW_AT_type:
                                    break;
                            }
                        }
                    }

                    element_orders.push_back(num_elements);
                }
            }
            break;
        }
    }
}

DWARFDIE
DWARFDIE::GetContainingDWOModuleDIE () const
{
    if (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 = 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)
                break;
        }

        return top_module_die;
    }
    return DWARFDIE();
}

bool
DWARFASTParserGo::CompleteTypeFromDWARF(const DWARFDIE &die, lldb_private::Type *type, CompilerType &compiler_type)
{
    if (!die)
        return false;

    const dw_tag_t tag = die.Tag();

    SymbolFileDWARF *dwarf = die.GetDWARF();
    Log *log = nullptr; // (LogChannelDWARF::GetLogIfAny(DWARF_LOG_DEBUG_INFO|DWARF_LOG_TYPE_COMPLETION));
    if (log)
        dwarf->GetObjectFile()->GetModule()->LogMessageVerboseBacktrace(
            log, "0x%8.8" PRIx64 ": %s '%s' resolving forward declaration...", dwarf->MakeUserID(die.GetOffset()),
            DW_TAG_value_to_name(tag), type->GetName().AsCString());
    assert(compiler_type);
    DWARFAttributes attributes;

    switch (tag)
    {
        case DW_TAG_structure_type:
        {
            {
                if (die.HasChildren())
                {
                    SymbolContext sc(die.GetLLDBCompileUnit());

                    ParseChildMembers(sc, die, compiler_type);
                }
            }
            m_ast.CompleteStructType(compiler_type);
            return (bool)compiler_type;
        }

        default:
            assert(false && "not a forward go type decl!");
            break;
    }

    return false;
}

bool
DWARFASTParserJava::CompleteTypeFromDWARF(const DWARFDIE &die, lldb_private::Type *type,
                                          lldb_private::CompilerType &java_type)
{
    switch (die.Tag())
    {
        case DW_TAG_class_type:
            {
                if (die.GetAttributeValueAsUnsigned(DW_AT_declaration, 0) == 0)
                {
                    if (die.HasChildren())
                        ParseChildMembers(die, java_type);
                    m_ast.CompleteObjectType(java_type);
                    return java_type.IsValid();
                }
            }
            break;
        default:
            assert(false && "Not a forward java type declaration!");
            break;
    }
    return false;
}

lldb::TypeSP DWARFASTParserOCaml::ParseTypeFromDWARF(const SymbolContext &sc,
                                                     const DWARFDIE &die,
                                                     Log *log,
                                                     bool *type_is_new_ptr) {
  if (type_is_new_ptr)
    *type_is_new_ptr = false;

  if (!die)
    return nullptr;

  SymbolFileDWARF *dwarf = die.GetDWARF();

  Type *type_ptr = dwarf->m_die_to_type.lookup(die.GetDIE());
  if (type_ptr == DIE_IS_BEING_PARSED)
    return nullptr;
  if (type_ptr != nullptr)
    return type_ptr->shared_from_this();

  TypeSP type_sp;
  if (type_is_new_ptr)
    *type_is_new_ptr = true;

  switch (die.Tag()) {
  case DW_TAG_base_type: {
    type_sp = ParseBaseTypeFromDIE(die);
    break;
  }
  case DW_TAG_array_type: {
    break;
  }
  case DW_TAG_class_type: {
    break;
  }
  case DW_TAG_reference_type: {
    break;
  }
  }

  if (!type_sp)
    return nullptr;

  DWARFDIE sc_parent_die = SymbolFileDWARF::GetParentSymbolContextDIE(die);
  dw_tag_t sc_parent_tag = sc_parent_die.Tag();

  SymbolContextScope *symbol_context_scope = nullptr;
  if (sc_parent_tag == DW_TAG_compile_unit) {
    symbol_context_scope = sc.comp_unit;
  } else if (sc.function != nullptr && sc_parent_die) {
    symbol_context_scope =
        sc.function->GetBlock(true).FindBlockByID(sc_parent_die.GetID());
    if (symbol_context_scope == nullptr)
      symbol_context_scope = sc.function;
  }

  if (symbol_context_scope != nullptr)
    type_sp->SetSymbolContextScope(symbol_context_scope);

  dwarf->GetTypeList()->Insert(type_sp);
  dwarf->m_die_to_type[die.GetDIE()] = type_sp.get();

  return type_sp;
}

size_t
DWARFASTParserGo::ParseChildMembers(const SymbolContext &sc, const DWARFDIE &parent_die, CompilerType &class_compiler_type)
{
    size_t count = 0;
    uint32_t member_idx = 0;

    ModuleSP module_sp = parent_die.GetDWARF()->GetObjectFile()->GetModule();
    GoASTContext *ast = llvm::dyn_cast_or_null<GoASTContext>(class_compiler_type.GetTypeSystem());
    if (ast == nullptr)
        return 0;

    for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); die = die.GetSibling())
    {
        dw_tag_t tag = die.Tag();

        switch (tag)
        {
            case DW_TAG_member:
            {
                DWARFAttributes attributes;
                const size_t num_attributes = die.GetAttributes(attributes);
                if (num_attributes > 0)
                {
                    Declaration decl;
                    const char *name = NULL;

                    lldb::user_id_t encoding_uid = LLDB_INVALID_UID;
                    uint32_t member_byte_offset = UINT32_MAX;
                    uint32_t i;
                    for (i = 0; i < num_attributes; ++i)
                    {
                        const dw_attr_t attr = attributes.AttributeAtIndex(i);
                        DWARFFormValue form_value;
                        if (attributes.ExtractFormValueAtIndex(i, form_value))
                        {
                            switch (attr)
                            {
                                case DW_AT_name:
                                    name = form_value.AsCString();
                                    break;
                                case DW_AT_type:
                                    encoding_uid = form_value.Reference();
                                    break;
                                case DW_AT_data_member_location:
                                    if (form_value.BlockData())
                                    {
                                        Value initialValue(0);
                                        Value memberOffset(0);
                                        const DWARFDataExtractor &debug_info_data =
                                            die.GetDWARF()->get_debug_info_data();
                                        uint32_t block_length = form_value.Unsigned();
                                        uint32_t block_offset = form_value.BlockData() - debug_info_data.GetDataStart();
                                        if (DWARFExpression::Evaluate(NULL, // ExecutionContext *
                                                                      NULL, // ClangExpressionVariableList *
                                                                      NULL, // ClangExpressionDeclMap *
                                                                      NULL, // RegisterContext *
                                                                      module_sp, debug_info_data, die.GetCU(),
                                                                      block_offset, block_length, eRegisterKindDWARF,
                                                                      &initialValue, NULL, memberOffset, NULL))
                                        {
                                            member_byte_offset = memberOffset.ResolveValue(NULL).UInt();
                                        }
                                    }
                                    else
                                    {
                                        // With DWARF 3 and later, if the value is an integer constant,
                                        // this form value is the offset in bytes from the beginning
                                        // of the containing entity.
                                        member_byte_offset = form_value.Unsigned();
                                    }
                                    break;

                                default:
                                    break;
                            }
                        }
                    }

                    Type *member_type = die.ResolveTypeUID(encoding_uid);
                    if (member_type)
                    {
                        CompilerType member_go_type = member_type->GetFullCompilerType();
                        ConstString name_const_str(name);
                        m_ast.AddFieldToStruct(class_compiler_type, name_const_str, member_go_type, member_byte_offset);
                    }
                }
                ++member_idx;
            }
            break;

            default:
                break;
        }
    }

    return count;
}

TypeSP
DWARFASTParserGo::ParseTypeFromDWARF(const lldb_private::SymbolContext &sc, const DWARFDIE &die, lldb_private::Log *log,
                                     bool *type_is_new_ptr)
{
    TypeSP type_sp;

    if (type_is_new_ptr)
        *type_is_new_ptr = false;

    if (die)
    {
        SymbolFileDWARF *dwarf = die.GetDWARF();
        if (log)
        {
            dwarf->GetObjectFile()->GetModule()->LogMessage(
                log, "DWARFASTParserGo::ParseTypeFromDWARF (die = 0x%8.8x) %s name = '%s')", die.GetOffset(),
                DW_TAG_value_to_name(die.Tag()), die.GetName());
        }

        Type *type_ptr = dwarf->m_die_to_type.lookup(die.GetDIE());
        TypeList *type_list = dwarf->GetTypeList();
        if (type_ptr == NULL)
        {
            if (type_is_new_ptr)
                *type_is_new_ptr = true;

            const dw_tag_t tag = die.Tag();

            bool is_forward_declaration = false;
            DWARFAttributes attributes;
            const char *type_name_cstr = NULL;
            ConstString type_name_const_str;
            Type::ResolveState resolve_state = Type::eResolveStateUnresolved;
            uint64_t byte_size = 0;
            uint64_t go_kind = 0;
            Declaration decl;

            Type::EncodingDataType encoding_data_type = Type::eEncodingIsUID;
            CompilerType compiler_type;
            DWARFFormValue form_value;

            dw_attr_t attr;

            switch (tag)
            {
                case DW_TAG_base_type:
                case DW_TAG_pointer_type:
                case DW_TAG_typedef:
                case DW_TAG_unspecified_type:
                {
                    // Set a bit that lets us know that we are currently parsing this
                    dwarf->m_die_to_type[die.GetDIE()] = DIE_IS_BEING_PARSED;

                    const size_t num_attributes = die.GetAttributes(attributes);
                    lldb::user_id_t encoding_uid = LLDB_INVALID_UID;

                    if (num_attributes > 0)
                    {
                        uint32_t i;
                        for (i = 0; i < num_attributes; ++i)
                        {
                            attr = attributes.AttributeAtIndex(i);
                            if (attributes.ExtractFormValueAtIndex(i, form_value))
                            {
                                switch (attr)
                                {
                                    case DW_AT_name:
                                        type_name_cstr = form_value.AsCString();
                                        if (type_name_cstr)
                                            type_name_const_str.SetCString(type_name_cstr);
                                        break;
                                    case DW_AT_byte_size:
                                        byte_size = form_value.Unsigned();
                                        break;
                                    case DW_AT_encoding:
                                        // = form_value.Unsigned();
                                        break;
                                    case DW_AT_type:
                                        encoding_uid = form_value.Reference();
                                        break;
                                    case DW_AT_go_kind:
                                        go_kind = form_value.Unsigned();
                                        break;
                                    default:
                                        // Do we care about DW_AT_go_key or DW_AT_go_elem?
                                        break;
                                }
                            }
                        }
                    }

                    DEBUG_PRINTF("0x%8.8" PRIx64 ": %s (\"%s\") type => 0x%8.8lx\n", dwarf->MakeUserID(die.GetOffset()),
                                 DW_TAG_value_to_name(tag), type_name_cstr, encoding_uid);

                    switch (tag)
                    {
                        default:
                            break;

                        case DW_TAG_unspecified_type:
//.........这里部分代码省略.........

void
DWARFASTParserJava::ParseChildMembers(const DWARFDIE &parent_die, CompilerType &compiler_type)
{
    DWARFCompileUnit *dwarf_cu = parent_die.GetCU();
    for (DWARFDIE die = parent_die.GetFirstChild(); die.IsValid(); die = die.GetSibling())
    {
        switch (die.Tag())
        {
            case DW_TAG_member:
            {
                const char *name = nullptr;
                DWARFFormValue encoding_uid;
                uint32_t member_byte_offset = UINT32_MAX;
                DWARFExpression member_location_expression(dwarf_cu);
                bool artificial = true;

                DWARFAttributes attributes;
                size_t num_attributes = die.GetAttributes(attributes);
                for (size_t i = 0; i < num_attributes; ++i)
                {
                    DWARFFormValue form_value;
                    if (attributes.ExtractFormValueAtIndex(i, form_value))
                    {
                        switch (attributes.AttributeAtIndex(i))
                        {
                            case DW_AT_name:
                                name = form_value.AsCString();
                                break;
                            case DW_AT_type:
                                encoding_uid = form_value;
                                break;
                            case DW_AT_data_member_location:
                                if (form_value.BlockData())
                                    member_location_expression.CopyOpcodeData(
                                        form_value.BlockData(), form_value.Unsigned(), dwarf_cu->GetByteOrder(),
                                        dwarf_cu->GetAddressByteSize());
                                else
                                    member_byte_offset = form_value.Unsigned();
                                break;
                            case DW_AT_artificial:
                                artificial = form_value.Boolean();
                                break;
                            case DW_AT_accessibility:
                                // TODO: Handle when needed
                                break;
                            default:
                                assert(false && "Unhandled attribute for DW_TAG_member");
                                break;
                        }
                    }
                }

                if (strcmp(name, ".dynamic_type") == 0)
                    m_ast.SetDynamicTypeId(compiler_type, member_location_expression);
                else
                {
                    if (Type *member_type = die.ResolveTypeUID(DIERef(encoding_uid)))
                        m_ast.AddMemberToObject(compiler_type, ConstString(name), member_type->GetFullCompilerType(),
                                                member_byte_offset);
                }
                break;
            }
            case DW_TAG_inheritance:
            {
                DWARFFormValue encoding_uid;
                uint32_t member_byte_offset = UINT32_MAX;

                DWARFAttributes attributes;
                size_t num_attributes = die.GetAttributes(attributes);
                for (size_t i = 0; i < num_attributes; ++i)
                {
                    DWARFFormValue form_value;
                    if (attributes.ExtractFormValueAtIndex(i, form_value))
                    {
                        switch (attributes.AttributeAtIndex(i))
                        {
                            case DW_AT_type:
                                encoding_uid = form_value;
                                break;
                            case DW_AT_data_member_location:
                                member_byte_offset = form_value.Unsigned();
                                break;
                            case DW_AT_accessibility:
                                // In java all base class is public so we can ignore this attribute
                                break;
                            default:
                                assert(false && "Unhandled attribute for DW_TAG_member");
                                break;
                        }
                    }
                }
                if (Type *base_type = die.ResolveTypeUID(DIERef(encoding_uid)))
                    m_ast.AddBaseClassToObject(compiler_type, base_type->GetFullCompilerType(), member_byte_offset);
                break;
            }
            default:
                break;
        }
    }
}