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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/contrib/llvm-project/compiler-rt/lib/builtins/crtbegin.c
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//===-- crtbegin.c - Start of constructors and destructors ----------------===//

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//

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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

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// See https://llvm.org/LICENSE.txt for license information.

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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

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//

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//===----------------------------------------------------------------------===//

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#include <stddef.h>

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__attribute__((visibility("hidden"))) void *__dso_handle = &__dso_handle;

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#ifdef EH_USE_FRAME_REGISTRY

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__extension__ static void *__EH_FRAME_LIST__[]

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    __attribute__((section(".eh_frame"), aligned(sizeof(void *)))) = {};

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extern void __register_frame_info(const void *, void *) __attribute__((weak));

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extern void *__deregister_frame_info(const void *) __attribute__((weak));

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#endif

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#ifndef CRT_HAS_INITFINI_ARRAY

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typedef void (*fp)(void);

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static fp __CTOR_LIST__[]

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    __attribute__((section(".ctors"), aligned(sizeof(fp)))) = {(fp)-1};

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extern fp __CTOR_LIST_END__[];

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#endif

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extern void __cxa_finalize(void *) __attribute__((weak));

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static void __attribute__((used)) __do_init(void) {

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  static _Bool __initialized;

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  if (__builtin_expect(__initialized, 0))

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    return;

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  __initialized = 1;

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#ifdef EH_USE_FRAME_REGISTRY

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  static struct { void *p[8]; } __object;

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  if (__register_frame_info)

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    __register_frame_info(__EH_FRAME_LIST__, &__object);

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#endif

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#ifndef CRT_HAS_INITFINI_ARRAY

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  const size_t n = __CTOR_LIST_END__ - __CTOR_LIST__ - 1;

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  for (size_t i = n; i >= 1; i--) __CTOR_LIST__[i]();

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#endif

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}

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#ifdef CRT_HAS_INITFINI_ARRAY

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__attribute__((section(".init_array"),

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               used)) static void (*__init)(void) = __do_init;

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#elif defined(__i386__) || defined(__x86_64__)

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__asm__(".pushsection .init,\"ax\",@progbits\n\t"

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        "call __do_init\n\t"

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        ".popsection");

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#elif defined(__riscv)

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__asm__(".pushsection .init,\"ax\",%progbits\n\t"

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        "call __do_init\n\t"

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        ".popsection");

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#elif defined(__arm__) || defined(__aarch64__)

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__asm__(".pushsection .init,\"ax\",%progbits\n\t"

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        "bl __do_init\n\t"

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        ".popsection");

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#elif defined(__mips__)

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__asm__(".pushsection .init,\"ax\",@progbits\n\t"

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        "jal __do_init\n\t"

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        ".popsection");

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#elif defined(__powerpc__) || defined(__powerpc64__)

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__asm__(".pushsection .init,\"ax\",@progbits\n\t"

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        "bl __do_init\n\t"

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        "nop\n\t"

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        ".popsection");

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#elif defined(__sparc__)

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__asm__(".pushsection .init,\"ax\",@progbits\n\t"

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        "call __do_init\n\t"

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        ".popsection");

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#else

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#error "crtbegin without .init_fini array unimplemented for this architecture"

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#endif // CRT_HAS_INITFINI_ARRAY

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#ifndef CRT_HAS_INITFINI_ARRAY

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static fp __DTOR_LIST__[]

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    __attribute__((section(".dtors"), aligned(sizeof(fp)))) = {(fp)-1};

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extern fp __DTOR_LIST_END__[];

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#endif

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static void __attribute__((used)) __do_fini(void) {

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  static _Bool __finalized;

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  if (__builtin_expect(__finalized, 0))

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    return;

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  __finalized = 1;

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  if (__cxa_finalize)

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    __cxa_finalize(__dso_handle);

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#ifndef CRT_HAS_INITFINI_ARRAY

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  const size_t n = __DTOR_LIST_END__ - __DTOR_LIST__ - 1;

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  for (size_t i = 1; i <= n; i++) __DTOR_LIST__[i]();

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#endif

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#ifdef EH_USE_FRAME_REGISTRY

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  if (__deregister_frame_info)

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    __deregister_frame_info(__EH_FRAME_LIST__);

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#endif

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}

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#ifdef CRT_HAS_INITFINI_ARRAY

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__attribute__((section(".fini_array"),

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               used)) static void (*__fini)(void) = __do_fini;

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#elif defined(__i386__) || defined(__x86_64__)

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__asm__(".pushsection .fini,\"ax\",@progbits\n\t"

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        "call __do_fini\n\t"

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        ".popsection");

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#elif defined(__arm__) || defined(__aarch64__)

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__asm__(".pushsection .fini,\"ax\",%progbits\n\t"

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        "bl __do_fini\n\t"

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        ".popsection");

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#elif defined(__mips__)

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__asm__(".pushsection .fini,\"ax\",@progbits\n\t"

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        "jal __do_fini\n\t"

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        ".popsection");

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#elif defined(__powerpc__) || defined(__powerpc64__)

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__asm__(".pushsection .fini,\"ax\",@progbits\n\t"

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        "bl __do_fini\n\t"

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        "nop\n\t"

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        ".popsection");

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#elif defined(__riscv)

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__asm__(".pushsection .fini,\"ax\",@progbits\n\t"

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        "call __do_fini\n\t"

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        ".popsection");

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#elif defined(__sparc__)

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__asm__(".pushsection .fini,\"ax\",@progbits\n\t"

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        "call __do_fini\n\t"

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        ".popsection");

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#else

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#error "crtbegin without .init_fini array unimplemented for this architecture"

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#endif  // CRT_HAS_INIT_FINI_ARRAY

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