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// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "PDB repository" project.
// For details, see https://github.com/egor-tensin/pdb-repo.
// Distributed under the MIT License.
#pragma once
#include "address.hpp"
#include "module.hpp"
#include <SafeInt.hpp>
#include <DbgHelp.h>
#include <Windows.h>
#include <climits>
#include <cstddef>
#include <cstring>
#include <stdexcept>
#include <string>
namespace pdb {
namespace symbol {
// MinGW-w64 (as of version 7.0) doesn't have SymTagEnum
typedef ULONG Tag;
constexpr Tag SYM_TAG_FUNCTION = 5;
#ifdef _MSC_VER
static_assert(static_cast<Tag>(SymTagFunction) == SYM_TAG_FUNCTION,
"unexpected SymTagFunction value");
#endif
} // namespace symbol
class SymbolInfo {
public:
typedef SYMBOL_INFO Raw;
SymbolInfo() : raw{*reinterpret_cast<Raw*>(buffer)} {
raw.SizeOfStruct = sizeof(Raw);
raw.MaxNameLen = MAX_SYM_NAME;
}
explicit SymbolInfo(const Raw& raw) : SymbolInfo{} {
if (raw.SizeOfStruct != sizeof(raw))
throw std::runtime_error{"invalid SYMBOL_INFO.SizeOfStruct"};
const auto raw_size = calc_size(raw);
if (raw_size > sizeof(buffer))
throw std::runtime_error{"SYMBOL_INFO is too large"};
std::memcpy(buffer, &raw, raw_size);
}
explicit operator Raw&() { return raw; }
explicit operator const Raw&() const { return raw; }
Address get_displacement() const { return displacement; }
void set_displacement(Address new_value) { displacement = new_value; }
std::string get_name() const { return {raw.Name, raw.NameLen}; }
Address get_offline_base() const { return raw.ModBase; }
Address get_offline_address() const { return raw.Address; }
symbol::Tag get_tag() const { return raw.Tag; }
enum class Type : symbol::Tag {
Function = symbol::SYM_TAG_FUNCTION,
RESERVED = ULONG_MAX,
};
Type get_type() const { return static_cast<Type>(get_tag()); }
bool is_function() const { return get_type() == Type::Function; }
private:
static constexpr std::size_t max_buffer_size = sizeof(Raw) + MAX_SYM_NAME - 1;
static std::size_t calc_size(const Raw& raw) {
try {
return SafeInt<std::size_t>{raw.SizeOfStruct} + raw.NameLen - 1;
} catch (const SafeIntException&) {
throw std::runtime_error{"invalid SYMBOL_INFO size"};
}
}
unsigned char buffer[max_buffer_size] = {0};
Address displacement = 0;
protected:
Raw& raw;
};
class Symbol : public SymbolInfo {
public:
Symbol(Address online_address, const SymbolInfo& info)
: SymbolInfo{info}, online_address{online_address} {}
Address get_online_address() const { return online_address; }
private:
const Address online_address;
};
class LineInfo {
public:
typedef IMAGEHLP_LINE64 Raw;
explicit LineInfo(const Raw& raw)
: file_path{raw.FileName}, line_number{cast_line_number(raw.LineNumber)} {}
const std::string file_path;
const unsigned long line_number;
private:
static unsigned long cast_line_number(DWORD raw) {
unsigned long dest = 0;
if (!SafeCast(raw, dest))
throw std::runtime_error{"invalid line number"};
return dest;
}
};
} // namespace pdb
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