Source/bmalloc/bmalloc/BAssert.h

/*
 * Copyright (C) 2014-2016 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "BPlatform.h"
#include "Logging.h"

#if BUSE(OS_LOG)
#include <os/log.h>
#endif

#if defined(NDEBUG) && BOS(DARWIN)

#if BASAN_ENABLED
#define BBreakpointTrap()  __builtin_trap()
#elif BCPU(X86_64) || BCPU(X86)
#define BBreakpointTrap()  __asm__ volatile ("int3")
#elif BCPU(ARM_THUMB2)
#define BBreakpointTrap()  __asm__ volatile ("bkpt #0")
#elif BCPU(ARM64)
#define BBreakpointTrap()  __asm__ volatile ("brk #0")
#else
#error "Unsupported CPU".
#endif

// Crash with a SIGTRAP i.e EXC_BREAKPOINT.
// We are not using __builtin_trap because it is only guaranteed to abort, but not necessarily
// trigger a SIGTRAP. Instead, we use inline asm to ensure that we trigger the SIGTRAP.
#define BCRASH() do { \
        BBreakpointTrap(); \
        __builtin_unreachable(); \
    } while (false)

#else // not defined(NDEBUG) && BOS(DARWIN)

#if BASAN_ENABLED
#define BCRASH() __builtin_trap()
#else

#if defined(__GNUC__) // GCC or Clang
#define BCRASH() do { \
    *(int*)0xbbadbeef = 0; \
    __builtin_trap(); \
} while (0)
#else
#define BCRASH() do { \
    *(int*)0xbbadbeef = 0; \
    ((void(*)())0)(); \
} while (0)
#endif // defined(__GNUC__)
#endif // BASAN_ENABLED

#endif // defined(NDEBUG) && BOS(DARWIN)

#define BASSERT_IMPL(x) do { \
    if (!(x)) \
        BCRASH(); \
} while (0)

#define RELEASE_BASSERT(x) BASSERT_IMPL(x)
#define RELEASE_BASSERT_NOT_REACHED() BCRASH()

#if BUSE(OS_LOG)
#define BMALLOC_LOGGING_PREFIX "bmalloc: "
#define BLOG_ERROR(format, ...) os_log_error(OS_LOG_DEFAULT, BMALLOC_LOGGING_PREFIX format, __VA_ARGS__)
#else
#define BLOG_ERROR(format, ...) bmalloc::reportAssertionFailureWithMessage(__FILE__, __LINE__, __PRETTY_FUNCTION__, format, __VA_ARGS__)
#endif

#if defined(NDEBUG)
#define RELEASE_BASSERT_WITH_MESSAGE(x, format, ...) BASSERT_IMPL(x)
#else
#define RELEASE_BASSERT_WITH_MESSAGE(x, format, ...) do { \
    if (!(x)) { \
        BLOG_ERROR("ASSERTION FAILED: " #x " :: " format, ##__VA_ARGS__); \
        BCRASH(); \
    } \
} while (0)
#endif

#define BUNUSED(x) ((void)x)

// ===== Release build =====

#if defined(NDEBUG)

#define BASSERT(x)

#define IF_DEBUG(x)

#endif // defined(NDEBUG)


// ===== Debug build =====

#if !defined(NDEBUG)

#define BASSERT(x) BASSERT_IMPL(x)

#define IF_DEBUG(x) (x)

#endif // !defined(NDEBUG)