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Additionally, we will parse and expose the types of variables if they are complex, like Enums or Structs. Variables of an enum type are special in that they do not store all the members of said enum in their own VariableInfo like Structs do, rather, all of the values are stored in the VariableInfo for the Enum.
119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/NonnullOwnPtrVector.h>
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#include <AK/NonnullRefPtr.h>
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#include <AK/Optional.h>
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#include <AK/Vector.h>
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#include <LibDebug/Dwarf/DwarfInfo.h>
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#include <LibELF/Loader.h>
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#include <Libraries/LibDebug/Dwarf/DIE.h>
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#include <Libraries/LibDebug/Dwarf/LineProgram.h>
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#include <sys/arch/i386/regs.h>
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class DebugInfo {
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public:
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explicit DebugInfo(NonnullRefPtr<const ELF::Loader> elf);
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struct SourcePosition {
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String file_path;
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size_t line_number { 0 };
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u32 address_of_first_statement { 0 };
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bool operator==(const SourcePosition& other) const { return file_path == other.file_path && line_number == other.line_number; }
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bool operator!=(const SourcePosition& other) const { return !(*this == other); }
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};
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struct VariableInfo {
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enum class LocationType {
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None,
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Address,
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Register,
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};
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String name;
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String type_name;
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LocationType location_type { LocationType::None };
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union {
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u32 address;
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} location_data { 0 };
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union {
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u32 as_u32;
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u32 as_i32;
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const char* as_string;
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} constant_data { 0 };
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Dwarf::EntryTag type_tag;
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OwnPtr<VariableInfo> type;
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NonnullOwnPtrVector<VariableInfo> members;
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VariableInfo* parent { nullptr };
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bool is_enum_type() const { return type && type->type_tag == Dwarf::EntryTag::EnumerationType; }
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};
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struct VariablesScope {
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bool is_function { false };
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String name;
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u32 address_low { 0 };
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u32 address_high { 0 };
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Vector<Dwarf::DIE> dies_of_variables;
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};
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NonnullOwnPtrVector<VariableInfo> get_variables_in_current_scope(const PtraceRegisters&) const;
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Optional<SourcePosition> get_source_position(u32 address) const;
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Optional<u32> get_instruction_from_source(const String& file, size_t line) const;
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template<typename Callback>
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void for_each_source_position(Callback callback) const
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{
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String previous_file = "";
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size_t previous_line = 0;
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for (const auto& line_info : m_sorted_lines) {
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if (line_info.file == previous_file && line_info.line == previous_line)
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continue;
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previous_file = line_info.file;
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previous_line = line_info.line;
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callback({ line_info.file, line_info.line, line_info.address });
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}
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}
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String name_of_containing_function(u32 address) const;
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private:
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void prepare_variable_scopes();
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void prepare_lines();
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void parse_scopes_impl(const Dwarf::DIE& die);
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OwnPtr<VariableInfo> create_variable_info(const Dwarf::DIE& variable_die, const PtraceRegisters&) const;
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NonnullRefPtr<const ELF::Loader> m_elf;
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NonnullRefPtr<Dwarf::DwarfInfo> m_dwarf_info;
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Vector<VariablesScope> m_scopes;
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Vector<LineProgram::LineInfo> m_sorted_lines;
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};
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