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On Linux crt is typically use in combination with builtins. In the Clang driver the use of builtins and crt is controlled by the --rtlib option. Both builtins and crt also have similar build requirements where they need to be built before any other runtimes and must avoid dependencies. We also want builtins and crt these to be buildable separately from the rest of compiler-rt for bootstrapping purposes. Given how simple crt is, rather than maintaining a separate directory with its own separate build setup, it's more efficient to just move crt into builtins. We still use separate CMake option to control whether to built crt same as before. This is an alternative to D89492 and D136664. Differential Revision: https://reviews.llvm.org/D153989
136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
//===-- 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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