1 //===-- stats_client.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 // Sanitizer statistics gathering. Manages statistics for a module (executable 11 // or DSO) and registers statistics with the process. 12 // 13 // This is linked into each individual modle and cannot directly use functions 14 // declared in sanitizer_common. 15 // 16 //===----------------------------------------------------------------------===// 17 18 #ifdef _WIN32 19 #include <windows.h> 20 #else 21 #include <dlfcn.h> 22 #endif 23 #include <stdint.h> 24 #include <stdio.h> 25 26 #include "sanitizer_common/sanitizer_internal_defs.h" 27 #include "stats/stats.h" 28 29 using namespace __sanitizer; 30 31 namespace { 32 33 void *LookupSymbolFromMain(const char *name) { 34 #ifdef _WIN32 35 return reinterpret_cast<void *>(GetProcAddress(GetModuleHandle(0), name)); 36 #else 37 return dlsym(RTLD_DEFAULT, name); 38 #endif 39 } 40 41 StatModule *list; 42 43 struct RegisterSanStats { 44 unsigned module_id; 45 46 RegisterSanStats() { 47 typedef unsigned (*reg_func_t)(StatModule **); 48 reg_func_t reg_func = reinterpret_cast<reg_func_t>( 49 LookupSymbolFromMain("__sanitizer_stats_register")); 50 if (reg_func) 51 module_id = reg_func(&list); 52 } 53 54 ~RegisterSanStats() { 55 typedef void (*unreg_func_t)(unsigned); 56 unreg_func_t unreg_func = reinterpret_cast<unreg_func_t>( 57 LookupSymbolFromMain("__sanitizer_stats_unregister")); 58 if (unreg_func) 59 unreg_func(module_id); 60 } 61 } reg; 62 63 } 64 65 extern "C" void __sanitizer_stat_init(StatModule *mod) { 66 mod->next = list; 67 list = mod; 68 } 69 70 extern "C" void __sanitizer_stat_report(StatInfo *s) { 71 s->addr = GET_CALLER_PC(); 72 #if defined(_WIN64) && !defined(__clang__) 73 uptr old_data = InterlockedIncrement64(reinterpret_cast<LONG64 *>(&s->data)); 74 #elif defined(_WIN32) && !defined(__clang__) 75 uptr old_data = InterlockedIncrement(&s->data); 76 #else 77 uptr old_data = __sync_fetch_and_add(&s->data, 1); 78 #endif 79 80 // Overflow check. 81 if (CountFromData(old_data + 1) == 0) 82 Trap(); 83 } 84
