1//===-- crtbegin.c - Start of constructors and destructors ----------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include <stddef.h>
10
11__attribute__((visibility("hidden"))) void *__dso_handle = &__dso_handle;
12
13#ifdef EH_USE_FRAME_REGISTRY
14__extension__ static void *__EH_FRAME_LIST__[]
15 __attribute__((section(".eh_frame"), aligned(sizeof(void *)))) = {};
16
17extern void __register_frame_info(const void *, void *) __attribute__((weak));
18extern void *__deregister_frame_info(const void *) __attribute__((weak));
19#endif
20
21#ifndef CRT_HAS_INITFINI_ARRAY
22typedef void (*fp)(void);
23
24static fp __CTOR_LIST__[]
25 __attribute__((section(".ctors"), aligned(sizeof(fp)))) = {(fp)-1};
26extern fp __CTOR_LIST_END__[];
27#endif
28
29extern void __cxa_finalize(void *) __attribute__((weak));
30
31static void __attribute__((used)) __do_init(void) {
32 static _Bool __initialized;
33 if (__builtin_expect(__initialized, 0))
34 return;
35 __initialized = 1;
36
37#ifdef EH_USE_FRAME_REGISTRY
38 static struct { void *p[8]; } __object;
39 if (__register_frame_info)
40 __register_frame_info(__EH_FRAME_LIST__, &__object);
41#endif
42#ifndef CRT_HAS_INITFINI_ARRAY
43 const size_t n = __CTOR_LIST_END__ - __CTOR_LIST__ - 1;
44 for (size_t i = n; i >= 1; i--) __CTOR_LIST__[i]();
45#endif
46}
47
48#ifdef CRT_HAS_INITFINI_ARRAY
49__attribute__((section(".init_array"),
50 used)) static void (*__init)(void) = __do_init;
51#elif defined(__i386__) || defined(__x86_64__)
52__asm__(".pushsection .init,\"ax\",@progbits\n\t"
53 "call __do_init\n\t"
54 ".popsection");
55#elif defined(__riscv)
56__asm__(".pushsection .init,\"ax\",%progbits\n\t"
57 "call __do_init\n\t"
58 ".popsection");
59#elif defined(__arm__) || defined(__aarch64__)
60__asm__(".pushsection .init,\"ax\",%progbits\n\t"
61 "bl __do_init\n\t"
62 ".popsection");
63#elif defined(__mips__)
64__asm__(".pushsection .init,\"ax\",@progbits\n\t"
65 "jal __do_init\n\t"
66 ".popsection");
67#elif defined(__powerpc__) || defined(__powerpc64__)
68__asm__(".pushsection .init,\"ax\",@progbits\n\t"
69 "bl __do_init\n\t"
70 "nop\n\t"
71 ".popsection");
72#elif defined(__sparc__)
73__asm__(".pushsection .init,\"ax\",@progbits\n\t"
74 "call __do_init\n\t"
75 ".popsection");
76#else
77#error "crtbegin without .init_fini array unimplemented for this architecture"
78#endif // CRT_HAS_INITFINI_ARRAY
79
80#ifndef CRT_HAS_INITFINI_ARRAY
81static fp __DTOR_LIST__[]
82 __attribute__((section(".dtors"), aligned(sizeof(fp)))) = {(fp)-1};
83extern fp __DTOR_LIST_END__[];
84#endif
85
86static void __attribute__((used)) __do_fini(void) {
87 static _Bool __finalized;
88 if (__builtin_expect(__finalized, 0))
89 return;
90 __finalized = 1;
91
92 if (__cxa_finalize)
93 __cxa_finalize(__dso_handle);
94
95#ifndef CRT_HAS_INITFINI_ARRAY
96 const size_t n = __DTOR_LIST_END__ - __DTOR_LIST__ - 1;
97 for (size_t i = 1; i <= n; i++) __DTOR_LIST__[i]();
98#endif
99#ifdef EH_USE_FRAME_REGISTRY
100 if (__deregister_frame_info)
101 __deregister_frame_info(__EH_FRAME_LIST__);
102#endif
103}
104
105#ifdef CRT_HAS_INITFINI_ARRAY
106__attribute__((section(".fini_array"),
107 used)) static void (*__fini)(void) = __do_fini;
108#elif defined(__i386__) || defined(__x86_64__)
109__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
110 "call __do_fini\n\t"
111 ".popsection");
112#elif defined(__arm__) || defined(__aarch64__)
113__asm__(".pushsection .fini,\"ax\",%progbits\n\t"
114 "bl __do_fini\n\t"
115 ".popsection");
116#elif defined(__mips__)
117__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
118 "jal __do_fini\n\t"
119 ".popsection");
120#elif defined(__powerpc__) || defined(__powerpc64__)
121__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
122 "bl __do_fini\n\t"
123 "nop\n\t"
124 ".popsection");
125#elif defined(__riscv)
126__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
127 "call __do_fini\n\t"
128 ".popsection");
129#elif defined(__sparc__)
130__asm__(".pushsection .fini,\"ax\",@progbits\n\t"
131 "call __do_fini\n\t"
132 ".popsection");
133#else
134#error "crtbegin without .init_fini array unimplemented for this architecture"
135#endif // CRT_HAS_INIT_FINI_ARRAY
136

source code of compiler-rt/lib/builtins/crtbegin.c