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unwinder.h
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165 lines (135 loc) · 4.01 KB
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#pragma once
#include <functional>
#include <map>
#include <memory>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
#include "elf_common.h"
#include "mem.h"
#include "native_frame.h"
namespace pystack {
class UnwinderError : public std::exception
{
public:
explicit UnwinderError(std::string error)
: d_error(std::move(error)){};
[[nodiscard]] const char* what() const noexcept override
{
return d_error.c_str();
}
private:
std::string d_error;
};
class Frame
{
public:
Frame(Dwarf_Addr pc, bool isActivation, std::optional<Dwarf_Word> stackPointer)
: pc(pc)
, isActivation(isActivation)
, stackPointer(stackPointer)
{
}
Dwarf_Addr pc;
bool isActivation;
std::optional<Dwarf_Word> stackPointer;
};
class ModuleCuDieRanges
{
public:
// Methods
Dwarf_Die* moduleAddrDie(Dwfl_Module* mod, Dwarf_Addr addr, Dwarf_Addr* bias);
private:
// Classes
class CuDieRanges
{
public:
// Classes
struct CuDieRange
{
Dwarf_Die* cuDie;
Dwarf_Addr bias;
Dwarf_Addr low;
Dwarf_Addr high;
inline bool contains(Dwarf_Addr addr) const
{
return low <= addr && addr < high;
}
};
// Methods
explicit CuDieRanges(Dwfl_Module* mod = nullptr);
Dwarf_Die* findDie(Dwarf_Addr addr, Dwarf_Addr* bias) const;
// Data members
std::vector<CuDieRange> d_ranges;
};
// Data members
std::unordered_map<Dwfl_Module*, CuDieRanges> d_die_range_maps;
};
class AbstractUnwinder
{
public:
// Methods
virtual remote_addr_t
getAddressforSymbol(const std::string& symbol, const std::string& modulename) const;
virtual std::vector<NativeFrame> unwindThread(pid_t tid) const = 0;
// Static methods
static std::string demangleSymbol(const std::string&);
virtual ~AbstractUnwinder() = default;
protected:
// Methods
virtual struct Dwfl* Dwfl() const = 0;
std::vector<NativeFrame> gatherFrames(const std::vector<Frame>& frames) const;
private:
// Enums
enum class StatusCode {
SUCCESS,
ERROR,
};
// Aliases
using Scopes = std::shared_ptr<Dwarf_Die>;
using ScopesInfo = std::pair<int, Scopes>;
// Methods
Dwarf_Die* dwarfModuleAddrDie(Dwarf_Addr pc_adjusted, Dwfl_Module* mod, Dwarf_Addr* bias) const;
std::pair<int, Scopes> dwarfGetScopes(Dwarf_Die* cudie, Dwarf_Addr pc_adjusted) const;
std::pair<int, Scopes> dwarfGetScopesDie(Dwarf_Die* die) const;
const char* getNonInlineSymbolName(Dwfl_Module* mod, Dwarf_Addr pc) const;
StatusCode gatherInlineFrames(
std::vector<NativeFrame>& native_frames,
const std::string& noninline_symname,
Dwarf_Addr pc,
Dwarf_Addr pc_corrected,
Dwarf_Die* cudie,
const char* mod_name) const;
// Data members
mutable ModuleCuDieRanges d_range_maps_cache;
mutable std::unordered_map<Dwarf_Addr, ScopesInfo> d_dwarf_getscopes_cache;
mutable std::unordered_map<void*, ScopesInfo> d_dwarf_getscopes_die_cache;
mutable std::unordered_map<Dwarf_Addr, const char*> d_symbol_by_pc_cache;
};
class Unwinder : public AbstractUnwinder
{
public:
// Constructors
explicit Unwinder(std::shared_ptr<ProcessAnalyzer> analyzer);
// Methods
virtual struct Dwfl* Dwfl() const override;
std::vector<NativeFrame> unwindThread(pid_t tid) const override;
private:
// Data members
std::shared_ptr<ProcessAnalyzer> d_analyzer;
};
class CoreFileUnwinder : public AbstractUnwinder
{
public:
// Constructors
explicit CoreFileUnwinder(std::shared_ptr<CoreFileAnalyzer> analyzer);
// Methods
virtual struct Dwfl* Dwfl() const override;
std::vector<int> getCoreTids() const;
std::vector<NativeFrame> unwindThread(pid_t tid) const override;
private:
// Data members
std::shared_ptr<CoreFileAnalyzer> d_analyzer;
};
} // namespace pystack