1351282Sdim//===-- crtbegin.c - Start of constructors and destructors ----------------===//
2351282Sdim//
3351282Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4351282Sdim// See https://llvm.org/LICENSE.txt for license information.
5351282Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6351282Sdim//
7351282Sdim//===----------------------------------------------------------------------===//
8351282Sdim
9351282Sdim#include <stddef.h>
10351282Sdim
11351282Sdim__attribute__((visibility("hidden"))) void *__dso_handle = &__dso_handle;
12351282Sdim
13360784Sdim#ifdef EH_USE_FRAME_REGISTRY
14351282Sdim__extension__ static void *__EH_FRAME_LIST__[]
15351282Sdim    __attribute__((section(".eh_frame"), aligned(sizeof(void *)))) = {};
16351282Sdim
17351282Sdimextern void __register_frame_info(const void *, void *) __attribute__((weak));
18351282Sdimextern void *__deregister_frame_info(const void *) __attribute__((weak));
19360784Sdim#endif
20351282Sdim
21351282Sdim#ifndef CRT_HAS_INITFINI_ARRAY
22351282Sdimtypedef void (*fp)(void);
23351282Sdim
24351282Sdimstatic fp __CTOR_LIST__[]
25351282Sdim    __attribute__((section(".ctors"), aligned(sizeof(fp)))) = {(fp)-1};
26351282Sdimextern fp __CTOR_LIST_END__[];
27351282Sdim#endif
28351282Sdim
29351282Sdimextern void __cxa_finalize(void *) __attribute__((weak));
30351282Sdim
31351282Sdimstatic void __attribute__((used)) __do_init() {
32351282Sdim  static _Bool __initialized;
33351282Sdim  if (__builtin_expect(__initialized, 0))
34351282Sdim    return;
35351282Sdim  __initialized = 1;
36351282Sdim
37360784Sdim#ifdef EH_USE_FRAME_REGISTRY
38351282Sdim  static struct { void *p[8]; } __object;
39351282Sdim  if (__register_frame_info)
40351282Sdim    __register_frame_info(__EH_FRAME_LIST__, &__object);
41360784Sdim#endif
42351282Sdim#ifndef CRT_HAS_INITFINI_ARRAY
43351282Sdim  const size_t n = __CTOR_LIST_END__ - __CTOR_LIST__ - 1;
44351282Sdim  for (size_t i = n; i >= 1; i--) __CTOR_LIST__[i]();
45351282Sdim#endif
46351282Sdim}
47351282Sdim
48351282Sdim#ifdef CRT_HAS_INITFINI_ARRAY
49351282Sdim__attribute__((section(".init_array"),
50351282Sdim               used)) static void (*__init)(void) = __do_init;
51360784Sdim#elif defined(__i386__) || defined(__x86_64__)
52351282Sdim__asm__(".pushsection .init,\"ax\",@progbits\n\t"
53351282Sdim    "call " __USER_LABEL_PREFIX__ "__do_init\n\t"
54351282Sdim    ".popsection");
55360784Sdim#elif defined(__arm__) || defined(__aarch64__)
56351282Sdim__asm__(".pushsection .init,\"ax\",%progbits\n\t"
57351282Sdim    "bl " __USER_LABEL_PREFIX__ "__do_init\n\t"
58351282Sdim    ".popsection");
59360784Sdim#elif defined(__powerpc__) || defined(__powerpc64__)
60360784Sdim__asm__(".pushsection .init,\"ax\",@progbits\n\t"
61360784Sdim    "bl " __USER_LABEL_PREFIX__ "__do_init\n\t"
62360784Sdim    "nop\n\t"
63360784Sdim    ".popsection");
64360784Sdim#elif defined(__sparc__)
65360784Sdim__asm__(".pushsection .init,\"ax\",@progbits\n\t"
66360784Sdim    "call " __USER_LABEL_PREFIX__ "__do_init\n\t"
67360784Sdim    ".popsection");
68360784Sdim#else
69360784Sdim#error "crtbegin without .init_fini array unimplemented for this architecture"
70360784Sdim#endif // CRT_HAS_INITFINI_ARRAY
71351282Sdim
72351282Sdim#ifndef CRT_HAS_INITFINI_ARRAY
73351282Sdimstatic fp __DTOR_LIST__[]
74351282Sdim    __attribute__((section(".dtors"), aligned(sizeof(fp)))) = {(fp)-1};
75351282Sdimextern fp __DTOR_LIST_END__[];
76351282Sdim#endif
77351282Sdim
78351282Sdimstatic void __attribute__((used)) __do_fini() {
79351282Sdim  static _Bool __finalized;
80351282Sdim  if (__builtin_expect(__finalized, 0))
81351282Sdim    return;
82351282Sdim  __finalized = 1;
83351282Sdim
84351282Sdim  if (__cxa_finalize)
85351282Sdim    __cxa_finalize(__dso_handle);
86351282Sdim
87351282Sdim#ifndef CRT_HAS_INITFINI_ARRAY
88351282Sdim  const size_t n = __DTOR_LIST_END__ - __DTOR_LIST__ - 1;
89351282Sdim  for (size_t i = 1; i <= n; i++) __DTOR_LIST__[i]();
90351282Sdim#endif
91360784Sdim#ifdef EH_USE_FRAME_REGISTRY
92360784Sdim  if (__deregister_frame_info)
93360784Sdim    __deregister_frame_info(__EH_FRAME_LIST__);
94360784Sdim#endif
95351282Sdim}
96351282Sdim
97351282Sdim#ifdef CRT_HAS_INITFINI_ARRAY
98351282Sdim__attribute__((section(".fini_array"),
99351282Sdim               used)) static void (*__fini)(void) = __do_fini;
100360784Sdim#elif defined(__i386__) || defined(__x86_64__)
101351282Sdim__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
102351282Sdim    "call " __USER_LABEL_PREFIX__ "__do_fini\n\t"
103351282Sdim    ".popsection");
104360784Sdim#elif defined(__arm__) || defined(__aarch64__)
105351282Sdim__asm__(".pushsection .fini,\"ax\",%progbits\n\t"
106351282Sdim    "bl " __USER_LABEL_PREFIX__ "__do_fini\n\t"
107351282Sdim    ".popsection");
108360784Sdim#elif defined(__powerpc__) || defined(__powerpc64__)
109360784Sdim__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
110360784Sdim    "bl " __USER_LABEL_PREFIX__ "__do_fini\n\t"
111360784Sdim    "nop\n\t"
112360784Sdim    ".popsection");
113360784Sdim#elif defined(__sparc__)
114360784Sdim__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
115360784Sdim    "call " __USER_LABEL_PREFIX__ "__do_fini\n\t"
116360784Sdim    ".popsection");
117360784Sdim#else
118360784Sdim#error "crtbegin without .init_fini array unimplemented for this architecture"
119351282Sdim#endif  // CRT_HAS_INIT_FINI_ARRAY
120