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LibDebug: Add Dwarf::CompilationUnit::base_address()

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The base address of the compilation unit is used in some range lists
entry types.
This commit is contained in:
Itamar 2021-09-28 13:26:49 +03:00 • committed by Andreas Kling
parent 01417c82c5
commit 2b04a86d4d
2 changed files with 17 additions and 0 deletions
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14
Userland/Libraries/LibDebug/Dwarf/CompilationUnit.cpp
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@ -30,4 +30,18 @@ DIE CompilationUnit::get_die_at_offset(u32 die_offset) const
return DIE(*this, die_offset);
}
Optional<FlatPtr> CompilationUnit::base_address() const
{
if (m_has_cached_base_address)
return m_cached_base_address;
auto die = root_die();
auto res = die.get_attribute(Attribute::LowPc);
if (res.has_value()) {
m_cached_base_address = res->data.as_addr;
}
m_has_cached_base_address = true;
return m_cached_base_address;
}
}

3
Userland/Libraries/LibDebug/Dwarf/CompilationUnit.h
View file

@ -34,6 +34,7 @@ public:
DwarfInfo const& dwarf_info() const { return m_dwarf_info; }
AbbreviationsMap const& abbreviations_map() const { return m_abbreviations; }
LineProgram const& line_program() const { return *m_line_program; }
Optional<FlatPtr> base_address() const;
private:
DwarfInfo const& m_dwarf_info;
@ -41,6 +42,8 @@ private:
CompilationUnitHeader m_header;
AbbreviationsMap m_abbreviations;
NonnullOwnPtr<LineProgram> m_line_program;
mutable bool m_has_cached_base_address { false };
mutable Optional<FlatPtr> m_cached_base_address;
};
}