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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.
#include "pdb/all.hpp"
#include <safeint.h>
#include <Windows.h>
#include <DbgHelp.h>
#include <cstddef>
#include <stdexcept>
#include <string>
namespace pdb
{
namespace
{
void enable_debug_output()
{
SymSetOptions(SymGetOptions() | SYMOPT_DEBUG | SYMOPT_UNDNAME);
}
void initialize(HANDLE id)
{
enable_debug_output();
if (!SymInitialize(id, NULL, FALSE))
throw error::windows(GetLastError());
}
void clean_up(HANDLE id)
{
if (!SymCleanup(id))
throw error::windows(GetLastError());
}
Address next_offline_base = 0x10000000;
Address gen_next_offline_base(std::size_t pdb_size)
{
const auto base = next_offline_base;
using msl::utilities::SafeAdd;
if (!SafeAdd(next_offline_base, pdb_size, next_offline_base))
throw std::runtime_error{"no more PDB files can be added, the internal address space is exhausted"};
return base;
}
BOOL CALLBACK enum_symbols_callback(
SYMBOL_INFO *info,
ULONG,
VOID *raw_callback_ptr)
{
const auto callback_ptr = reinterpret_cast<DbgHelp::OnSymbol*>(raw_callback_ptr);
const auto& callback = *callback_ptr;
callback(SymbolInfo{*info});
return TRUE;
}
}
DbgHelp::DbgHelp()
{
initialize(id);
}
DbgHelp::~DbgHelp()
{
try
{
close();
}
catch (...)
{ }
}
void DbgHelp::close()
{
if (!closed)
{
clean_up(id);
closed = true;
}
}
ModuleInfo DbgHelp::load_pdb(const std::string& path) const
{
DWORD size = 0;
if (!msl::utilities::SafeCast(file::get_size(path), size))
throw std::range_error{"PDB file is too large"};
const auto offline_base = SymLoadModule64(
id,
NULL,
path.c_str(),
NULL,
gen_next_offline_base(size),
size);
if (!offline_base)
throw error::windows(GetLastError());
return get_module_info(offline_base);
}
ModuleInfo DbgHelp::get_module_info(Address offline_base) const
{
ModuleInfo info;
if (!SymGetModuleInfo64(
id,
offline_base,
&static_cast<ModuleInfo::Raw&>(info)))
throw error::windows(GetLastError());
return info;
}
void DbgHelp::enum_symbols(const ModuleInfo& module, const OnSymbol& callback) const
{
if (!SymEnumSymbols(
id,
module.get_offline_base(),
NULL,
&enum_symbols_callback,
const_cast<OnSymbol*>(&callback)))
throw error::windows(GetLastError());
}
SymbolInfo DbgHelp::resolve_symbol(Address online) const
{
Address displacement = 0;
SymbolInfo symbol;
if (!SymFromAddr(
id,
online,
&displacement,
&static_cast<SYMBOL_INFO&>(symbol)))
throw error::windows(GetLastError());
symbol.set_displacement(displacement);
return symbol;
}
SymbolInfo DbgHelp::resolve_symbol(const std::string& name) const
{
SymbolInfo symbol;
if (!SymFromName(
id,
name.c_str(),
&static_cast<SYMBOL_INFO&>(symbol)))
throw error::windows(GetLastError());
return symbol;
}
}
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