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LibDebug: Parse DWARF information entries

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We can now iterate the tree structure of the DIEs, access attribute
values and parse some very basic DWARF expressions.
This commit is contained in:
Itamar 2020-05-04 12:14:39 +03:00 • committed by Andreas Kling
parent 2cafc36d9c
commit c5eb20d0cc
14 changed files with 1067 additions and 3 deletions
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37
Libraries/LibDebug/DebugInfo.h
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@ -26,11 +26,15 @@
#pragma once
#include <AK/NonnullOwnPtrVector.h>
#include <AK/NonnullRefPtr.h>
#include <AK/Optional.h>
#include <AK/Vector.h>
#include <LibDebug/Dwarf/DwarfInfo.h>
#include <LibELF/Loader.h>
#include <Libraries/LibDebug/Dwarf/DIE.h>
#include <Libraries/LibDebug/Dwarf/LineProgram.h>
#include <sys/arch/i386/regs.h>
class DebugInfo {
public:
@ -45,6 +49,33 @@ public:
bool operator!=(const SourcePosition& other) const { return !(*this == other); }
};
struct VariableInfo {
enum class LocationType {
None,
Address,
Regsiter,
};
String name;
String type;
LocationType location_type { LocationType::None };
union {
u32 address;
} location_data { 0 };
NonnullOwnPtrVector<VariableInfo> members;
VariableInfo* parent { nullptr };
};
struct VariablesScope {
bool is_function { false };
Optional<String> name;
u32 address_low { 0 };
u32 address_high { 0 };
Vector<Dwarf::DIE> dies_of_variables;
};
NonnullOwnPtrVector<VariableInfo> get_variables_in_current_scope(const PtraceRegisters&) const;
Optional<SourcePosition> get_source_position(u32 address) const;
Optional<u32> get_instruction_from_source(const String& file, size_t line) const;
@ -63,9 +94,15 @@ public:
}
private:
void prepare_variable_scopes();
void prepare_lines();
void parse_scopes_impl(const Dwarf::DIE& die);
Optional<VariablesScope> get_scope(u32 instruction_pointer) const;
NonnullOwnPtr<VariableInfo> create_variable_info(const Dwarf::DIE& variable_die, const PtraceRegisters&) const;
NonnullRefPtr<const ELF::Loader> m_elf;
NonnullRefPtr<Dwarf::DwarfInfo> m_dwarf_info;
Vector<VariablesScope> m_scopes;
Vector<LineProgram::LineInfo> m_sorted_lines;
};