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[compiler-rt] Simple crtbegin.o and crtend.o implementation
Clang relies on existence of certain symbols that are normally provided by crtbegin.o/crtend.o. However, LLVM does not currently provide implementation of these files, instead relying on either libgcc or implementations provided as part of the system. This change provides an initial implementation of crtbegin.o/crtend.o that can be used on system that don't provide crtbegin.o/crtend.o as part of their C library. Differential Revision: https://reviews.llvm.org/D28791 llvm-svn: 359576
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| add_compiler_rt_component(crt) | ||
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| function(check_cxx_section_exists section output) | ||
| cmake_parse_arguments(ARG "" "" "SOURCE;FLAGS" ${ARGN}) | ||
| if(NOT ARG_SOURCE) | ||
| set(ARG_SOURCE "int main() { return 0; }\n") | ||
| endif() | ||
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| string(RANDOM TARGET_NAME) | ||
| set(TARGET_NAME "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/cmTC_${TARGET_NAME}.dir") | ||
| file(MAKE_DIRECTORY ${TARGET_NAME}) | ||
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| file(WRITE "${TARGET_NAME}/CheckSectionExists.c" "${ARG_SOURCE}\n") | ||
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| string(REGEX MATCHALL "<[A-Za-z0-9_]*>" substitutions | ||
| ${CMAKE_C_COMPILE_OBJECT}) | ||
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| set(try_compile_flags "${ARG_FLAGS}") | ||
| if(CMAKE_C_COMPILER_ID MATCHES Clang AND CMAKE_C_COMPILER_TARGET) | ||
| list(APPEND try_compile_flags "-target ${CMAKE_C_COMPILER_TARGET}") | ||
| endif() | ||
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| string(REPLACE ";" " " extra_flags "${try_compile_flags}") | ||
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| set(test_compile_command "${CMAKE_C_COMPILE_OBJECT}") | ||
| foreach(substitution ${substitutions}) | ||
| if(substitution STREQUAL "<CMAKE_C_COMPILER>") | ||
| string(REPLACE "<CMAKE_C_COMPILER>" | ||
| "${CMAKE_C_COMPILER}" test_compile_command ${test_compile_command}) | ||
| elseif(substitution STREQUAL "<OBJECT>") | ||
| string(REPLACE "<OBJECT>" "${TARGET_NAME}/CheckSectionExists.o" | ||
| test_compile_command ${test_compile_command}) | ||
| elseif(substitution STREQUAL "<SOURCE>") | ||
| string(REPLACE "<SOURCE>" "${TARGET_NAME}/CheckSectionExists.c" | ||
| test_compile_command ${test_compile_command}) | ||
| elseif(substitution STREQUAL "<FLAGS>") | ||
| string(REPLACE "<FLAGS>" "${CMAKE_C_FLAGS} ${extra_flags}" | ||
| test_compile_command ${test_compile_command}) | ||
| else() | ||
| string(REPLACE "${substitution}" "" test_compile_command | ||
| ${test_compile_command}) | ||
| endif() | ||
| endforeach() | ||
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| string(REPLACE " " ";" test_compile_command "${test_compile_command}") | ||
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| execute_process( | ||
| COMMAND ${test_compile_command} | ||
| RESULT_VARIABLE TEST_RESULT | ||
| OUTPUT_VARIABLE TEST_OUTPUT | ||
| ERROR_VARIABLE TEST_ERROR | ||
| ) | ||
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| execute_process( | ||
| COMMAND ${CMAKE_OBJDUMP} -h "${TARGET_NAME}/CheckSectionExists.o" | ||
| RESULT_VARIABLE CHECK_RESULT | ||
| OUTPUT_VARIABLE CHECK_OUTPUT | ||
| ERROR_VARIABLE CHECK_ERROR | ||
| ) | ||
| string(FIND "${CHECK_OUTPUT}" "${section}" SECTION_FOUND) | ||
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| if(NOT SECTION_FOUND EQUAL -1) | ||
| set(${output} TRUE PARENT_SCOPE) | ||
| else() | ||
| set(${output} FALSE PARENT_SCOPE) | ||
| endif() | ||
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| file(REMOVE_RECURSE ${TARGET_NAME}) | ||
| endfunction() | ||
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| check_cxx_section_exists(".init_array" COMPILER_RT_HAS_INITFINI_ARRAY | ||
| SOURCE "__attribute__((constructor)) void f() {}\nint main() { return 0; }\n") | ||
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| append_list_if(COMPILER_RT_HAS_INITFINI_ARRAY -DCRT_HAS_INITFINI_ARRAY CRT_CFLAGS) | ||
| append_list_if(COMPILER_RT_HAS_FPIC_FLAG -fPIC CRT_CFLAGS) | ||
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| foreach(arch ${CRT_SUPPORTED_ARCH}) | ||
| add_compiler_rt_runtime(clang_rt.crtbegin | ||
| OBJECT | ||
| ARCHS ${arch} | ||
| SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtbegin.c | ||
| CFLAGS ${CRT_CFLAGS} | ||
| PARENT_TARGET crt) | ||
| add_compiler_rt_runtime(clang_rt.crtend | ||
| OBJECT | ||
| ARCHS ${arch} | ||
| SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/crtend.c | ||
| CFLAGS ${CRT_CFLAGS} | ||
| PARENT_TARGET crt) | ||
| endforeach() |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| //===-- crtbegin.c - Start of constructors and destructors ----------------===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include <stddef.h> | ||
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| __attribute__((visibility("hidden"))) void *__dso_handle = &__dso_handle; | ||
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| static void *__EH_FRAME_LIST__[] | ||
| __attribute__((section(".eh_frame"), aligned(sizeof(void *)))) = {}; | ||
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| extern void __register_frame_info(const void *, void *) __attribute__((weak)); | ||
| extern void *__deregister_frame_info(const void *) __attribute__((weak)); | ||
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| #ifndef CRT_HAS_INITFINI_ARRAY | ||
| typedef void (*fp)(void); | ||
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| static fp __CTOR_LIST__[] | ||
| __attribute__((section(".ctors"), aligned(sizeof(fp)))) = {(fp)-1}; | ||
| extern fp __CTOR_LIST_END__[]; | ||
| #endif | ||
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| extern void __cxa_finalize(void *) __attribute__((weak)); | ||
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| static void __attribute__((used)) __do_init() { | ||
| static _Bool __initialized; | ||
| if (__builtin_expect(__initialized, 0)) | ||
| return; | ||
| __initialized = 1; | ||
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| static struct { void *p[8]; } __object; | ||
| if (__register_frame_info) | ||
| __register_frame_info(__EH_FRAME_LIST__, &__object); | ||
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| #ifndef CRT_HAS_INITFINI_ARRAY | ||
| const size_t n = __CTOR_LIST_END__ - __CTOR_LIST__ - 1; | ||
| for (size_t i = n; i >= 1; i--) __CTOR_LIST__[i](); | ||
| #endif | ||
| } | ||
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| #ifdef CRT_HAS_INITFINI_ARRAY | ||
| __attribute__((section(".init_array"), | ||
| used)) static void (*__init)(void) = __do_init; | ||
| #else // CRT_HAS_INITFINI_ARRAY | ||
| #if defined(__i386__) || defined(__x86_64__) | ||
| asm(".pushsection .init,\"ax\",@progbits\n\t" | ||
| "call " __USER_LABEL_PREFIX__ "__do_init\n\t" | ||
| ".popsection"); | ||
| #elif defined(__arm__) | ||
| asm(".pushsection .init,\"ax\",%progbits\n\t" | ||
| "bl " __USER_LABEL_PREFIX__ "__do_init\n\t" | ||
| ".popsection"); | ||
| #endif // CRT_HAS_INITFINI_ARRAY | ||
| #endif | ||
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| #ifndef CRT_HAS_INITFINI_ARRAY | ||
| static fp __DTOR_LIST__[] | ||
| __attribute__((section(".dtors"), aligned(sizeof(fp)))) = {(fp)-1}; | ||
| extern fp __DTOR_LIST_END__[]; | ||
| #endif | ||
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| static void __attribute__((used)) __do_fini() { | ||
| static _Bool __finalized; | ||
| if (__builtin_expect(__finalized, 0)) | ||
| return; | ||
| __finalized = 1; | ||
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| if (__cxa_finalize) | ||
| __cxa_finalize(__dso_handle); | ||
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| #ifndef CRT_HAS_INITFINI_ARRAY | ||
| if (__deregister_frame_info) | ||
| __deregister_frame_info(__EH_FRAME_LIST__); | ||
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| const size_t n = __DTOR_LIST_END__ - __DTOR_LIST__ - 1; | ||
| for (size_t i = 1; i < n; i++) __DTOR_LIST__[i](); | ||
| #endif | ||
| } | ||
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| #ifdef CRT_HAS_INITFINI_ARRAY | ||
| __attribute__((section(".fini_array"), | ||
| used)) static void (*__fini)(void) = __do_fini; | ||
| #else // CRT_HAS_INITFINI_ARRAY | ||
| #if defined(__i386__) || defined(__x86_64__) | ||
| asm(".pushsection .fini,\"ax\",@progbits\n\t" | ||
| "call " __USER_LABEL_PREFIX__ "__do_fini\n\t" | ||
| ".popsection"); | ||
| #elif defined(__arm__) | ||
| asm(".pushsection .fini,\"ax\",%progbits\n\t" | ||
| "bl " __USER_LABEL_PREFIX__ "__do_fini\n\t" | ||
| ".popsection"); | ||
| #endif | ||
| #endif // CRT_HAS_INIT_FINI_ARRAY |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| //===-- crtend.c - End of constructors and destructors --------------------===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include <stdint.h> | ||
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| // Put 4-byte zero which is the length field in FDE at the end as a terminator. | ||
| const int32_t __EH_FRAME_LIST_END__[] | ||
| __attribute__((section(".eh_frame"), aligned(sizeof(int32_t)), | ||
| visibility("hidden"), used)) = {0}; | ||
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| #ifndef CRT_HAS_INITFINI_ARRAY | ||
| typedef void (*fp)(void); | ||
| fp __CTOR_LIST_END__[] | ||
| __attribute__((section(".ctors"), visibility("hidden"), used)) = {0}; | ||
| fp __DTOR_LIST_END__[] | ||
| __attribute__((section(".dtors"), visibility("hidden"), used)) = {0}; | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| set(CRT_LIT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}) | ||
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| set(CRT_TESTSUITES) | ||
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| set(CRT_TEST_DEPS) | ||
| if(NOT COMPILER_RT_STANDALONE_BUILD) | ||
| list(APPEND CRT_TEST_DEPS crt) | ||
| endif() | ||
| if(NOT COMPILER_RT_STANDALONE_BUILD AND NOT RUNTIMES_BUILD) | ||
| # Use LLVM utils and Clang from the same build tree. | ||
| list(APPEND CRT_TEST_DEPS | ||
| clang clang-resource-headers FileCheck not llvm-config) | ||
| endif() | ||
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| set(CRT_TEST_ARCH ${CRT_SUPPORTED_ARCH}) | ||
| if (COMPILER_RT_BUILD_CRT AND COMPILER_RT_HAS_CRT) | ||
| foreach(arch ${CRT_TEST_ARCH}) | ||
| set(CRT_TEST_TARGET_ARCH ${arch}) | ||
| string(TOLOWER "-${arch}-${OS_NAME}" CRT_TEST_CONFIG_SUFFIX) | ||
| get_test_cc_for_arch(${arch} CRT_TEST_TARGET_CC CRT_TEST_TARGET_CFLAGS) | ||
| string(TOUPPER ${arch} ARCH_UPPER_CASE) | ||
| set(CONFIG_NAME ${ARCH_UPPER_CASE}${OS_NAME}Config) | ||
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| configure_lit_site_cfg( | ||
| ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in | ||
| ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/lit.site.cfg) | ||
| list(APPEND CRT_TESTSUITES ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}) | ||
| endforeach() | ||
| endif() | ||
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| add_lit_testsuite(check-crt "Running the CRT tests" | ||
| ${CRT_TESTSUITES} | ||
| DEPENDS ${CRT_TEST_DEPS}) | ||
| set_target_properties(check-crt PROPERTIES FOLDER "Compiler-RT Misc") |
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