mirror of
https://github.com/SerenityOS/serenity
synced 2024-10-15 12:23:15 +00:00
LibDebug: Don't expose AttributeValue internals, use getters instead
This will be needed when we add `DW_FORM_strx*` and `DW_FORM_addrx*` support, which requires us to fetch `DW_AT_str_offsets_base` and `DW_AT_addr_base` attributes from the parent compilation unit. This can't be done as we read the values, because it would create infinite recursion (as we might try to parse the compilation unit's `DW_FORM_strx*` encoded name before we get to the attribute). Having getters ensures that we will perform lookups if they are needed.
This commit is contained in:
parent
1b63c8f3b0
commit
8e5b70a0ba
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@ -54,15 +54,18 @@ void DebugInfo::parse_scopes_impl(Dwarf::DIE const& die)
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VariablesScope scope {};
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scope.is_function = (child.tag() == Dwarf::EntryTag::SubProgram);
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if (name.has_value())
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scope.name = name.value().data.as_string;
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scope.name = name.value().as_string();
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if (!child.get_attribute(Dwarf::Attribute::LowPc).has_value()) {
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dbgln_if(SPAM_DEBUG, "DWARF: Couldn't find attribute LowPc for scope");
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return;
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}
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scope.address_low = child.get_attribute(Dwarf::Attribute::LowPc).value().data.as_addr;
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// The attribute name HighPc is confusing. In this context, it seems to actually be a positive offset from LowPc
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scope.address_high = scope.address_low + child.get_attribute(Dwarf::Attribute::HighPc).value().data.as_addr;
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scope.address_low = child.get_attribute(Dwarf::Attribute::LowPc).value().as_addr();
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auto high_pc = child.get_attribute(Dwarf::Attribute::HighPc);
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if (high_pc->type() == Dwarf::AttributeValue::Type::Address)
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scope.address_high = high_pc->as_addr();
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else
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scope.address_high = scope.address_low + high_pc->as_unsigned();
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child.for_each_child([&](Dwarf::DIE const& variable_entry) {
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if (!(variable_entry.tag() == Dwarf::EntryTag::Variable
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@ -187,12 +190,12 @@ static Optional<Dwarf::DIE> parse_variable_type_die(Dwarf::DIE const& variable_d
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if (!type_die_offset.has_value())
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return {};
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VERIFY(type_die_offset.value().type == Dwarf::AttributeValue::Type::DieReference);
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VERIFY(type_die_offset.value().type() == Dwarf::AttributeValue::Type::DieReference);
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auto type_die = variable_die.compilation_unit().get_die_at_offset(type_die_offset.value().data.as_unsigned);
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auto type_die = variable_die.compilation_unit().get_die_at_offset(type_die_offset.value().as_unsigned());
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auto type_name = type_die.get_attribute(Dwarf::Attribute::Name);
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if (type_name.has_value()) {
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variable_info.type_name = type_name.value().data.as_string;
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variable_info.type_name = type_name.value().as_string();
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} else {
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dbgln("Unnamed DWARF type at offset: {}", type_die.offset());
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variable_info.type_name = "[Unnamed Type]";
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@ -211,13 +214,13 @@ static void parse_variable_location(Dwarf::DIE const& variable_die, DebugInfo::V
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if (!location_info.has_value())
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return;
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switch (location_info.value().type) {
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switch (location_info.value().type()) {
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case Dwarf::AttributeValue::Type::UnsignedNumber:
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variable_info.location_type = DebugInfo::VariableInfo::LocationType::Address;
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variable_info.location_data.address = location_info.value().data.as_addr;
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variable_info.location_data.address = location_info.value().as_unsigned();
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break;
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case Dwarf::AttributeValue::Type::DwarfExpression: {
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auto expression_bytes = ReadonlyBytes { location_info.value().data.as_raw_bytes.bytes, location_info.value().data.as_raw_bytes.length };
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auto expression_bytes = location_info.value().as_raw_bytes();
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auto value = Dwarf::Expression::evaluate(expression_bytes, regs);
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if (value.type != Dwarf::Expression::Type::None) {
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@ -228,7 +231,7 @@ static void parse_variable_location(Dwarf::DIE const& variable_die, DebugInfo::V
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break;
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}
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default:
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dbgln("Warning: unhandled Dwarf location type: {}", (int)location_info.value().type);
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dbgln("Warning: unhandled Dwarf location type: {}", (int)location_info.value().type());
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}
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}
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@ -245,22 +248,22 @@ OwnPtr<DebugInfo::VariableInfo> DebugInfo::create_variable_info(Dwarf::DIE const
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NonnullOwnPtr<VariableInfo> variable_info = make<VariableInfo>();
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auto name_attribute = variable_die.get_attribute(Dwarf::Attribute::Name);
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if (name_attribute.has_value())
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variable_info->name = name_attribute.value().data.as_string;
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variable_info->name = name_attribute.value().as_string();
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auto type_die = parse_variable_type_die(variable_die, *variable_info);
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if (variable_die.tag() == Dwarf::EntryTag::Enumerator) {
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auto constant = variable_die.get_attribute(Dwarf::Attribute::ConstValue);
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VERIFY(constant.has_value());
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switch (constant.value().type) {
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switch (constant.value().type()) {
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case Dwarf::AttributeValue::Type::UnsignedNumber:
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variable_info->constant_data.as_u32 = constant.value().data.as_unsigned;
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variable_info->constant_data.as_u32 = constant.value().as_unsigned();
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break;
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case Dwarf::AttributeValue::Type::SignedNumber:
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variable_info->constant_data.as_i32 = constant.value().data.as_signed;
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variable_info->constant_data.as_i32 = constant.value().as_signed();
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break;
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case Dwarf::AttributeValue::Type::String:
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variable_info->constant_data.as_string = constant.value().data.as_string;
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variable_info->constant_data.as_string = constant.value().as_string();
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break;
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default:
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VERIFY_NOT_REACHED();
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@ -294,7 +297,7 @@ void DebugInfo::add_type_info_to_variable(Dwarf::DIE const& type_die, PtraceRegi
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if (is_array_type && member.tag() == Dwarf::EntryTag::SubRangeType) {
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auto upper_bound = member.get_attribute(Dwarf::Attribute::UpperBound);
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VERIFY(upper_bound.has_value());
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auto size = upper_bound.value().data.as_unsigned + 1;
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auto size = upper_bound.value().as_unsigned() + 1;
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type_info->dimension_sizes.append(size);
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return;
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}
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@ -428,12 +431,12 @@ Optional<Dwarf::LineProgram::DirectoryAndFile> DebugInfo::get_source_path_of_inl
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if (caller_file.has_value()) {
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u32 file_index = 0;
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if (caller_file->type == Dwarf::AttributeValue::Type::UnsignedNumber) {
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file_index = caller_file->data.as_unsigned;
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} else if (caller_file->type == Dwarf::AttributeValue::Type::SignedNumber) {
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if (caller_file->type() == Dwarf::AttributeValue::Type::UnsignedNumber) {
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file_index = caller_file->as_unsigned();
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} else if (caller_file->type() == Dwarf::AttributeValue::Type::SignedNumber) {
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// For some reason, the file_index is sometimes stored as a signed number.
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VERIFY(caller_file->data.as_signed >= 0);
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file_index = (u32)caller_file->data.as_signed;
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VERIFY(caller_file->as_signed() >= 0);
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file_index = (u32)caller_file->as_signed();
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} else {
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return {};
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}
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@ -449,9 +452,9 @@ Optional<uint32_t> DebugInfo::get_line_of_inline(Dwarf::DIE const& die) const
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if (!caller_line.has_value())
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return {};
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if (caller_line->type != Dwarf::AttributeValue::Type::UnsignedNumber)
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if (caller_line->type() != Dwarf::AttributeValue::Type::UnsignedNumber)
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return {};
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return caller_line.value().data.as_unsigned;
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return caller_line.value().as_unsigned();
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}
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}
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@ -6,12 +6,18 @@
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#pragma once
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#include <AK/Span.h>
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#include <AK/Types.h>
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#include <LibDebug/Dwarf/DwarfTypes.h>
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namespace Debug::Dwarf {
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struct AttributeValue {
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class CompilationUnit;
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class AttributeValue {
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friend class DwarfInfo;
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public:
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enum class Type : u8 {
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UnsignedNumber,
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SignedNumber,
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@ -21,21 +27,33 @@ struct AttributeValue {
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DwarfExpression,
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SecOffset,
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RawBytes,
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} type;
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Address
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};
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Type type() const { return m_type; }
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AttributeDataForm form() const { return m_form; }
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FlatPtr as_addr() const { return m_data.as_addr; }
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u64 as_unsigned() const { return m_data.as_unsigned; }
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i64 as_signed() const { return m_data.as_signed; }
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const char* as_string() const { return m_data.as_string; }
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bool as_bool() const { return m_data.as_bool; }
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ReadonlyBytes as_raw_bytes() const { return m_data.as_raw_bytes; }
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private:
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Type m_type;
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union {
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FlatPtr as_addr;
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u64 as_unsigned;
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i64 as_signed;
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const char* as_string; // points to bytes in the memory mapped elf image
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bool as_bool;
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struct {
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u32 length;
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const u8* bytes; // points to bytes in the memory mapped elf image
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} as_raw_bytes;
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} data {};
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ReadonlyBytes as_raw_bytes;
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} m_data {};
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AttributeDataForm form {};
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AttributeDataForm m_form {};
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CompilationUnit const* m_compilation_unit { nullptr };
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};
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}
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@ -38,7 +38,7 @@ Optional<FlatPtr> CompilationUnit::base_address() const
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auto die = root_die();
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auto res = die.get_attribute(Attribute::LowPc);
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if (res.has_value()) {
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m_cached_base_address = res->data.as_addr;
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m_cached_base_address = res->as_addr();
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}
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m_has_cached_base_address = true;
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return m_cached_base_address;
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@ -81,7 +81,7 @@ void DIE::for_each_child(Function<void(DIE const& child)> callback) const
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auto sibling = current_child.get_attribute(Attribute::Sibling);
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u32 sibling_offset = 0;
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if (sibling.has_value()) {
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sibling_offset = sibling.value().data.as_unsigned;
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sibling_offset = sibling.value().as_unsigned();
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} else {
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// NOTE: According to the spec, the compiler doesn't have to supply the sibling information.
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// When it doesn't, we have to recursively iterate the current child's children to find where they end
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@ -66,14 +66,14 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
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InputMemoryStream& debug_info_stream, const CompilationUnit* unit) const
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{
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AttributeValue value;
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value.form = form;
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value.m_form = form;
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value.m_compilation_unit = unit;
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auto assign_raw_bytes_value = [&](size_t length) {
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value.data.as_raw_bytes.length = length;
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value.data.as_raw_bytes.bytes = reinterpret_cast<const u8*>(debug_info_data().data()
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+ debug_info_stream.offset());
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value.m_data.as_raw_bytes = { reinterpret_cast<const u8*>(debug_info_data().data() + debug_info_stream.offset()), length };
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debug_info_stream.discard_or_error(length);
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VERIFY(!debug_info_stream.has_any_error());
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};
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switch (form) {
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@ -81,95 +81,95 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
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u32 offset;
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debug_info_stream >> offset;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::String;
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value.m_type = AttributeValue::Type::String;
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auto strings_data = debug_strings_data();
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value.data.as_string = reinterpret_cast<const char*>(strings_data.data() + offset);
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value.m_data.as_string = reinterpret_cast<const char*>(strings_data.data() + offset);
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break;
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}
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case AttributeDataForm::Data1: {
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u8 data;
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debug_info_stream >> data;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_unsigned = data;
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value.m_type = AttributeValue::Type::UnsignedNumber;
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value.m_data.as_unsigned = data;
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break;
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}
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case AttributeDataForm::Data2: {
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u16 data;
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debug_info_stream >> data;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_signed = data;
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value.m_type = AttributeValue::Type::UnsignedNumber;
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value.m_data.as_signed = data;
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break;
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}
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case AttributeDataForm::Addr: {
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FlatPtr address;
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debug_info_stream >> address;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_addr = address;
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value.m_type = AttributeValue::Type::Address;
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value.m_data.as_addr = address;
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break;
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}
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case AttributeDataForm::SData: {
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i64 data;
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debug_info_stream.read_LEB128_signed(data);
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::SignedNumber;
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value.data.as_signed = data;
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value.m_type = AttributeValue::Type::SignedNumber;
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value.m_data.as_signed = data;
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break;
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}
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case AttributeDataForm::UData: {
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u64 data;
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debug_info_stream.read_LEB128_unsigned(data);
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_unsigned = data;
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value.m_type = AttributeValue::Type::UnsignedNumber;
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value.m_data.as_unsigned = data;
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break;
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}
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case AttributeDataForm::SecOffset: {
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u32 data;
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debug_info_stream >> data;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::SecOffset;
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value.data.as_unsigned = data;
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value.m_type = AttributeValue::Type::SecOffset;
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value.m_data.as_unsigned = data;
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break;
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}
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case AttributeDataForm::Data4: {
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u32 data;
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debug_info_stream >> data;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_unsigned = data;
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value.m_type = AttributeValue::Type::UnsignedNumber;
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value.m_data.as_unsigned = data;
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break;
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}
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case AttributeDataForm::Data8: {
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u64 data;
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debug_info_stream >> data;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::UnsignedNumber;
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value.data.as_unsigned = data;
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value.m_type = AttributeValue::Type::UnsignedNumber;
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value.m_data.as_unsigned = data;
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break;
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}
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case AttributeDataForm::Ref4: {
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u32 data;
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debug_info_stream >> data;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::DieReference;
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value.m_type = AttributeValue::Type::DieReference;
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VERIFY(unit);
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value.data.as_unsigned = data + unit->offset();
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value.m_data.as_unsigned = data + unit->offset();
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break;
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}
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case AttributeDataForm::FlagPresent: {
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value.type = AttributeValue::Type::Boolean;
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value.data.as_bool = true;
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value.m_type = AttributeValue::Type::Boolean;
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value.m_data.as_bool = true;
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break;
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}
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case AttributeDataForm::ExprLoc: {
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size_t length;
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debug_info_stream.read_LEB128_unsigned(length);
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::DwarfExpression;
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value.m_type = AttributeValue::Type::DwarfExpression;
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assign_raw_bytes_value(length);
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break;
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}
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@ -178,12 +178,12 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
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u32 str_offset = debug_info_stream.offset();
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debug_info_stream >> str;
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VERIFY(!debug_info_stream.has_any_error());
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value.type = AttributeValue::Type::String;
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value.data.as_string = reinterpret_cast<const char*>(str_offset + debug_info_data().data());
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value.m_type = AttributeValue::Type::String;
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value.m_data.as_string = reinterpret_cast<const char*>(str_offset + debug_info_data().data());
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break;
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}
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case AttributeDataForm::Block1: {
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value.type = AttributeValue::Type::RawBytes;
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value.m_type = AttributeValue::Type::RawBytes;
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u8 length;
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debug_info_stream >> length;
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VERIFY(!debug_info_stream.has_any_error());
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@ -191,7 +191,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
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break;
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}
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case AttributeDataForm::Block2: {
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value.type = AttributeValue::Type::RawBytes;
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value.m_type = AttributeValue::Type::RawBytes;
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u16 length;
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debug_info_stream >> length;
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VERIFY(!debug_info_stream.has_any_error());
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@ -199,7 +199,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
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break;
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}
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case AttributeDataForm::Block4: {
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value.type = AttributeValue::Type::RawBytes;
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value.m_type = AttributeValue::Type::RawBytes;
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u32 length;
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debug_info_stream >> length;
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VERIFY(!debug_info_stream.has_any_error());
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@ -207,7 +207,7 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
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break;
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}
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case AttributeDataForm::Block: {
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value.type = AttributeValue::Type::RawBytes;
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value.m_type = AttributeValue::Type::RawBytes;
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size_t length;
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debug_info_stream.read_LEB128_unsigned(length);
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VERIFY(!debug_info_stream.has_any_error());
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||||
|
@ -218,16 +218,16 @@ AttributeValue DwarfInfo::get_attribute_value(AttributeDataForm form, ssize_t im
|
|||
u32 offset;
|
||||
debug_info_stream >> offset;
|
||||
VERIFY(!debug_info_stream.has_any_error());
|
||||
value.type = AttributeValue::Type::String;
|
||||
value.m_type = AttributeValue::Type::String;
|
||||
|
||||
auto strings_data = debug_line_strings_data();
|
||||
value.data.as_string = reinterpret_cast<const char*>(strings_data.data() + offset);
|
||||
value.m_data.as_string = reinterpret_cast<const char*>(strings_data.data() + offset);
|
||||
break;
|
||||
}
|
||||
case AttributeDataForm::ImplicitConst: {
|
||||
/* Value is part of the abbreviation record. */
|
||||
value.type = AttributeValue::Type::SignedNumber;
|
||||
value.data.as_signed = implicit_const_value;
|
||||
value.m_type = AttributeValue::Type::SignedNumber;
|
||||
value.m_data.as_signed = implicit_const_value;
|
||||
break;
|
||||
}
|
||||
default:
|
||||
|
@ -247,9 +247,9 @@ void DwarfInfo::build_cached_dies() const
|
|||
auto ranges = die.get_attribute(Attribute::Ranges);
|
||||
if (ranges.has_value()) {
|
||||
// TODO Support DW_FORM_rnglistx
|
||||
if (ranges->form != AttributeDataForm::SecOffset)
|
||||
if (ranges->form() != AttributeDataForm::SecOffset)
|
||||
return {};
|
||||
auto offset = ranges->data.as_addr;
|
||||
auto offset = ranges->as_unsigned();
|
||||
AddressRanges address_ranges(debug_range_lists_data(), offset, die.compilation_unit());
|
||||
Vector<DIERange> entries;
|
||||
address_ranges.for_each_range([&entries](auto range) {
|
||||
|
@ -264,18 +264,18 @@ void DwarfInfo::build_cached_dies() const
|
|||
if (!start.has_value() || !end.has_value())
|
||||
return {};
|
||||
|
||||
VERIFY(start->form == Dwarf::AttributeDataForm::Addr);
|
||||
VERIFY(start->type() == Dwarf::AttributeValue::Type::Address);
|
||||
|
||||
// DW_AT_high_pc attribute can have different meanings depending on the attribute form.
|
||||
// (Dwarf version 5, section 2.17.2).
|
||||
|
||||
uint32_t range_end = 0;
|
||||
if (end->form == Dwarf::AttributeDataForm::Addr)
|
||||
range_end = end->data.as_addr;
|
||||
if (end->form() == Dwarf::AttributeDataForm::Addr)
|
||||
range_end = end->as_addr();
|
||||
else
|
||||
range_end = start->data.as_unsigned + end->data.as_unsigned;
|
||||
range_end = start->as_addr() + end->as_unsigned();
|
||||
|
||||
return { DIERange { (FlatPtr)start.value().data.as_addr, range_end } };
|
||||
return { DIERange { start.value().as_addr(), range_end } };
|
||||
};
|
||||
|
||||
// If we simply use a lambda, type deduction fails because it's used recursively.
|
||||
|
|
|
@ -60,10 +60,10 @@ void LineProgram::parse_path_entries(Function<void(PathEntry& entry)> callback,
|
|||
auto value = m_dwarf_info.get_attribute_value(format_description.form, 0, m_stream);
|
||||
switch (format_description.type) {
|
||||
case ContentType::Path:
|
||||
entry.path = value.data.as_string;
|
||||
entry.path = value.as_string();
|
||||
break;
|
||||
case ContentType::DirectoryIndex:
|
||||
entry.directory_index = value.data.as_unsigned;
|
||||
entry.directory_index = value.as_unsigned();
|
||||
break;
|
||||
default:
|
||||
dbgln_if(DWARF_DEBUG, "Unhandled path list attribute: {}", (int)format_description.type);
|
||||
|
|
Loading…
Reference in a new issue