longjmp.h

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/*
 * Copyright © 2025, Niklas Haas
 * Copyright © 2018, VideoLAN and dav1d authors
 * Copyright © 2018, Two Orioles, LLC
 * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 */
 
#ifndef CHECKASM_LONGJMP_H
#define CHECKASM_LONGJMP_H
 
#include "checkasm_config.h"
 
#if defined(_WIN32) && !(defined(__i386__) || defined(_M_IX86))
 
  #include <windows.h>
 
    /* setjmp/longjmp on Windows on architectures using SEH (all except
     * x86_32) will try to use SEH to unwind the stack, which doesn't work
     * for assembly functions without unwind information. */
 
  #if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
 
typedef struct {
    CONTEXT c;
    int     status;
} checkasm_jmp_buf;
 
    #define checkasm_save_context(ctx)                                                   \
        ((ctx).status = 0, RtlCaptureContext(&(ctx).c), (ctx).status)
    #define checkasm_load_context(ctx)                                                   \
        ((ctx).status = 1, RtlRestoreContext(&(ctx).c, NULL))
 
  #endif /* WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) */
 
#elif !defined(_WASI_EMULATED_SIGNAL) /* (!_WIN32 || ARCH_X86_32) && !_WASI_EMULATED_SIGNAL */
 
  #include <setjmp.h>
 
  #if HAVE_SIGLONGJMP
typedef sigjmp_buf checkasm_jmp_buf;
    #define checkasm_save_context(ctx) sigsetjmp(ctx, 1)
    #define checkasm_load_context(ctx) siglongjmp(ctx, 1)
  #else /* !HAVE_SIGLONGJMP */
typedef jmp_buf checkasm_jmp_buf;
    #define checkasm_save_context(ctx) setjmp(ctx)
    #define checkasm_load_context(ctx) longjmp(ctx, 1)
  #endif /* !HAVE_SIGLONGJMP */
 
#endif /* (!_WIN32 || ARCH_X86_32) && !_WASI_EMULATED_SIGNAL */
 
#ifdef checkasm_save_context
  #define CHECKASM_HAVE_LONGJMP 1
#else
/* Dummy fallback if no other implementation was found */
typedef int checkasm_jmp_buf;
  #define checkasm_save_context(ctx) 0
  #define checkasm_load_context(ctx)
  #define CHECKASM_HAVE_LONGJMP 0
#endif
 
#endif /* CHECKASM_LONGJMP_H */