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https://github.com/SerenityOS/serenity
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4641af7873
On platforms that support it, enable using ``<execinfo.h>`` to get backtrace(3) to dump a backtrace on assertion failure. This should make debugging things like WebContent crashes in Lagom much easier.
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Assertions.h>
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#include <AK/Format.h>
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#include <AK/Platform.h>
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#include <AK/StringView.h>
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#if defined(AK_OS_LINUX) || defined(AK_OS_BSD_GENERIC) || defined(AK_OS_SOLARIS)
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# define EXECINFO_BACKTRACE
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#endif
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#if defined(EXECINFO_BACKTRACE)
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# include <cxxabi.h>
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# include <execinfo.h>
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#endif
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#if !defined(KERNEL)
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# if defined(EXECINFO_BACKTRACE)
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namespace {
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ALWAYS_INLINE void dump_backtrace()
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{
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// Grab symbols and dso name for up to 256 frames
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void* trace[256] = {};
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int const num_frames = backtrace(trace, sizeof(trace));
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char** syms = backtrace_symbols(trace, num_frames);
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for (auto i = 0; i < num_frames; ++i) {
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// If there is a C++ symbol name in the line of the backtrace, demangle it
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StringView sym(syms[i], strlen(syms[i]));
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if (auto idx = sym.find("_Z"sv); idx.has_value()) {
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// Play C games with the original string so we can print before and after the mangled symbol with a C API
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// We don't want to call dbgln() here on substring StringView because we might VERIFY() within AK::Format
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syms[i][idx.value() - 1] = '\0';
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(void)fprintf(stderr, "%s ", syms[i]);
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auto end_of_sym = sym.find(' ', idx.value()).value_or(sym.length() - 1);
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syms[i][end_of_sym] = '\0';
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size_t buf_size = 128u;
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char* buf = static_cast<char*>(malloc(buf_size));
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auto* raw_str = &syms[i][idx.value()];
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buf = abi::__cxa_demangle(raw_str, buf, &buf_size, nullptr);
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(void)fputs(buf ? buf : raw_str, stderr);
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free(buf);
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(void)fprintf(stderr, " %s", &syms[i][end_of_sym + 1]);
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} else {
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(void)fputs(sym.characters_without_null_termination(), stderr);
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}
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(void)fputs("\n", stderr);
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}
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free(syms);
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}
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}
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# endif
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extern "C" {
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void ak_verification_failed(char const* message)
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{
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dbgln("VERIFICATION FAILED: {}", message);
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# if defined(EXECINFO_BACKTRACE)
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dump_backtrace();
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# endif
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__builtin_trap();
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}
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}
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#endif
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