1 //===-- msan_loadable.cc --------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is a part of MemorySanitizer. 11 // 12 // MemorySanitizer unit tests. 13 //===----------------------------------------------------------------------===// 14 15 #include "msan/msan_interface_internal.h" 16 #include <stdlib.h> 17 18 static void *dso_global; 19 20 // No name mangling. 21 extern "C" { 22 23 __attribute__((constructor)) loadable_module_init(void)24void loadable_module_init(void) { 25 if (!__msan_has_dynamic_component()) 26 return; 27 // The real test is that this compare should not make an uninit. 28 if (dso_global == NULL) 29 dso_global = malloc(4); 30 } 31 32 __attribute__((destructor)) loadable_module_fini(void)33void loadable_module_fini(void) { 34 if (!__msan_has_dynamic_component()) 35 return; 36 free(dso_global); 37 // *Don't* overwrite it with NULL! That would unpoison it, but our test 38 // relies on reloading at the same address and keeping the poison. 39 } 40 get_dso_global()41void **get_dso_global() { 42 return &dso_global; 43 } 44 45 } 46