libcruft-util/debug.cpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
#include "backtrace.hpp"
#include "debug.hpp"
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#include "log.hpp"
#include "platform.hpp"
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#include <cstdlib>
#include <iostream>
using namespace util::debug;
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////////////////////////////////////////////////////////////////////////////////
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void
detail::panic (const char *msg)
{
std::cerr << "PANIC: " << msg << "\n" << ::debug::backtrace () << std::endl;
breakpoint ();
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abort ();
}
////////////////////////////////////////////////////////////////////////////////
#if defined(PLATFORM_WIN32)
#include <windows.h>
void
breakpoint (void)
{
DebugBreak ();
}
#else
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void
breakpoint (void)
{
#if defined (__x86_64) || defined (__i386)
__asm__ ("int $3;");
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#else
raise (SIGINT);
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#endif
}
#endif
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//-----------------------------------------------------------------------------
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void
detail::not_implemented (const char *msg)
{
panic (msg);
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}
//-----------------------------------------------------------------------------
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void
detail::unreachable (const char *msg)
{
panic (msg);
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}
////////////////////////////////////////////////////////////////////////////////
void
unusual (void)
{
panic ("Unusual code path found.");
}
////////////////////////////////////////////////////////////////////////////////
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#if defined(PLATFORM_LINUX)
#include <fenv.h>
void
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enable_fpe (void)
{
feenableexcept (FE_DIVBYZERO | FE_INVALID);
}
//-----------------------------------------------------------------------------
void
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disable_fpe (void)
{
feenableexcept (0);
}
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#else
// contropfp is not defined supposedly due to a regression in GCC include behaviours.
//-----------------------------------------------------------------------------
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void
enable_fpe (void)
{
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LOG_WARN ("Non-Linux exception code is broken under current GCC.");
// _clearfp();
// unsigned int ignored;
// _controlfp_s (&ignored, _MCW_EM, _MCW_EM);
}
//-----------------------------------------------------------------------------
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void
disable_fpe (void)
{
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LOG_WARN ("Non-Linux exception code is broken under current GCC.");
// _clearfp();
// unsigned int ignored;
// _controlfp_s (&ignored, 0, _MCW_EM);
}
#endif
////////////////////////////////////////////////////////////////////////////////
#if defined(PLATFORM_WIN32)
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#include <io.h>
#include <fcntl.h>
void
force_console (void)
{
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if (!AttachConsole (ATTACH_PARENT_PROCESS))
return;
auto out_handle = GetStdHandle (STD_OUTPUT_HANDLE);
auto err_handle = GetStdHandle (STD_ERROR_HANDLE);
auto in_handle = GetStdHandle (STD_INPUT_HANDLE);
auto out_fd = _open_osfhandle (reinterpret_cast<intptr_t> (out_handle), _O_TEXT);
auto err_fd = _open_osfhandle (reinterpret_cast<intptr_t> (err_handle), _O_TEXT);
auto in_fd = _open_osfhandle (reinterpret_cast<intptr_t> (in_handle), _O_TEXT);
auto out_file = _fdopen (out_fd, "w");
auto err_file = _fdopen (err_fd, "w");
auto in_file = _fdopen (in_fd, "r");
/// FILE objects are not reassignable, but Windows doesn't leave us much
/// choice here.
*stdout = *out_file;
*stderr = *err_file;
*stdin = *in_file;
setvbuf (stdout, NULL, _IONBF, 0);
setvbuf (stderr, NULL, _IONBF, 0);
setvbuf (stdin, NULL, _IONBF, 0);
ios::sync_with_stdio ();
// Windows doesn't give an immediate newline when an application is run
// from a console, so we provide one here for sanity.
std::cout << "\n";
std::cerr << "Console installed\n";
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}
#endif
////////////////////////////////////////////////////////////////////////////////
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void
util::debug::init (void)
{
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#if defined(PLATFORM_WIN32)
force_console ();
if (nullptr == LoadLibrary("exchndl.dll")) {
std::cerr << GetLastError () << "\n";
LOG_WARNING("Emergency debugger not loaded");
}
#endif
}