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LibDebug: Implement support for DWARF 5 compilation unit headers

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This commit is contained in:
Gunnar Beutner 2021-04-28 22:13:58 +02:00 committed by Andreas Kling
parent a3f2af49f9
commit 6b4448b623
Notes: sideshowbarker 2024-07-18 18:59:49 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/6b4448b6230
Pull-request: https://github.com/SerenityOS/serenity/pull/6714
4 changed files with 54 additions and 8 deletions
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5
Userland/Libraries/LibDebug/Dwarf/CompilationUnit.cpp
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@ -12,13 +12,14 @@ CompilationUnit::CompilationUnit(const DwarfInfo& dwarf_info, u32 offset, const
: m_dwarf_info(dwarf_info)
, m_offset(offset)
, m_header(header)
, m_abbreviations(dwarf_info, header.abbrev_offset)
, m_abbreviations(dwarf_info, header.abbrev_offset())
{
VERIFY(header.version() < 5 || header.unit_type() == CompilationUnitType::Full);
}
DIE CompilationUnit::root_die() const
{
return DIE(*this, m_offset + sizeof(CompilationUnitHeader));
return DIE(*this, m_offset + m_header.header_size());
}
}

2
Userland/Libraries/LibDebug/Dwarf/CompilationUnit.h
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@ -19,7 +19,7 @@ public:
CompilationUnit(const DwarfInfo& dwarf_info, u32 offset, const CompilationUnitHeader&);
u32 offset() const { return m_offset; }
u32 size() const { return m_header.length + sizeof(u32); }
u32 size() const { return m_header.length() + sizeof(u32); }
DIE root_die() const;

8
Userland/Libraries/LibDebug/Dwarf/DwarfInfo.cpp
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@ -38,11 +38,11 @@ void DwarfInfo::populate_compilation_units()
auto unit_offset = stream.offset();
CompilationUnitHeader compilation_unit_header {};
stream >> Bytes { &compilation_unit_header, sizeof(compilation_unit_header) };
VERIFY(compilation_unit_header.address_size == sizeof(u32));
VERIFY(compilation_unit_header.version <= 4);
stream >> compilation_unit_header;
VERIFY(compilation_unit_header.common.version <= 5);
VERIFY(compilation_unit_header.address_size() == sizeof(u32));
u32 length_after_header = compilation_unit_header.length - (sizeof(CompilationUnitHeader) - offsetof(CompilationUnitHeader, version));
u32 length_after_header = compilation_unit_header.length() - (compilation_unit_header.header_size() - offsetof(CompilationUnitHeader, common.version));
m_compilation_units.empend(*this, unit_offset, compilation_unit_header);
stream.discard_or_error(length_after_header);
}

47
Userland/Libraries/LibDebug/Dwarf/DwarfTypes.h
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@ -6,17 +6,62 @@
#pragma once
#include <AK/Stream.h>
#include <AK/Types.h>
namespace Debug::Dwarf {
struct [[gnu::packed]] CompilationUnitHeader {
enum class CompilationUnitType {
Full = 1,
Partial = 3
};
struct [[gnu::packed]] CompilationUnitHeaderCommon {
u32 length;
u16 version;
};
struct [[gnu::packed]] CompilationUnitHeaderV4Ext {
u32 abbrev_offset;
u8 address_size;
};
struct [[gnu::packed]] CompilationUnitHeaderV5Ext {
u8 unit_type;
u8 address_size;
u32 abbrev_offset;
};
struct [[gnu::packed]] CompilationUnitHeader {
CompilationUnitHeaderCommon common;
union {
CompilationUnitHeaderV4Ext v4;
CompilationUnitHeaderV5Ext v5;
};
size_t header_size() const
{
return sizeof(common) + ((common.version <= 4) ? sizeof(v4) : sizeof(v5));
}
u32 length() const { return common.length; }
u16 version() const { return common.version; }
CompilationUnitType unit_type() const { return (common.version <= 4) ? CompilationUnitType::Full : (CompilationUnitType)v5.unit_type; }
u32 abbrev_offset() const { return (common.version <= 4) ? v4.abbrev_offset : v5.abbrev_offset; }
u8 address_size() const { return (common.version <= 4) ? v4.address_size : v5.address_size; }
};
inline InputStream& operator>>(InputStream& stream, CompilationUnitHeader& header)
{
stream.read_or_error(Bytes { &header.common, sizeof(header.common) });
if (header.common.version <= 4)
stream.read_or_error(Bytes { &header.v4, sizeof(header.v4) });
else
stream.read_or_error(Bytes { &header.v5, sizeof(header.v5) });
return stream;
}
enum class EntryTag : u16 {
None = 0,
ArrayType = 0x1,