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// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-debug" project.
// For details, see https://github.com/egor-tensin/winapi-debug.
// Distributed under the MIT License.
#include <winapi/debug.hpp>
#include <windows.h>
#include <algorithm>
#include <array>
#include <cstddef>
#include <ostream>
#include <sstream>
#include <stdexcept>
#include <string>
#include <system_error>
namespace winapi {
namespace {
template <typename T>
static std::string put_between_brackets(const T& x) {
std::ostringstream oss;
oss << "[" << x << "]";
return oss.str();
}
std::string format_address_fallback(Address addr) {
return put_between_brackets(address::format(addr));
}
std::string offset_from(const std::string& thing, Address offset) {
if (offset == 0)
return put_between_brackets(thing);
else
return put_between_brackets(thing + "+" + address::format(offset));
}
std::string offset_from_module(const ModuleInfo& module, Address addr) {
Address offset = 0;
if (addr < module.get_offline_base())
throw std::range_error{"invalid address in module"};
offset = addr - module.get_offline_base();
return offset_from(module.get_name(), offset);
}
std::string offset_from_symbol(const SymbolInfo& symbol) {
return offset_from(symbol.get_name(), symbol.get_displacement());
}
std::string offset_from_symbol(const ModuleInfo& module, const SymbolInfo& symbol) {
return offset_from(module.get_name() + "!" + symbol.get_name(), symbol.get_displacement());
}
std::string resolve_and_format(const DbgHelp& dbghelp, const SymbolInfo& symbol, Address addr) {
try {
const auto module = dbghelp.resolve_module(addr);
return offset_from_symbol(module, symbol);
} catch (const std::system_error&) {
return offset_from_symbol(symbol);
}
}
std::string resolve_and_format(const DbgHelp& dbghelp, Address addr) {
try {
const auto symbol = dbghelp.resolve_symbol(addr);
return resolve_and_format(dbghelp, symbol, addr);
} catch (const std::system_error&) {
try {
const auto module = dbghelp.resolve_module(addr);
return offset_from_module(module, addr);
} catch (const std::system_error&) {
return format_address_fallback(addr);
}
}
assert(false);
return {};
}
} // namespace
CallStack CallStack::capture() {
std::array<void*, max_length> frames_impl{nullptr};
const auto length =
CaptureStackBackTrace(frames_to_skip, frames_to_capture, frames_impl.data(), NULL);
std::array<Address, max_length> frames;
std::transform(frames_impl.cbegin(), frames_impl.cend(), frames.begin(), [](void* addr) {
return reinterpret_cast<Address>(addr);
});
return {frames, length};
}
bool CallStack::for_each_address(const AddressCallback& callback) const {
for (std::size_t i = 0; i < length; ++i) {
if (!callback(frames[i])) {
return false;
}
}
return true;
}
std::string CallStack::pretty_print_address(const DbgHelp& dbghelp, Address addr) {
return resolve_and_format(dbghelp, addr);
}
void CallStack::dump(std::ostream& os, const DbgHelp& dbghelp) const {
for_each_address([&](Address addr) {
os << address::format(addr) << ' ' << pretty_print_address(dbghelp, addr) << '\n';
return true;
});
}
} // namespace winapi
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