1//===-- tsan_symbolize.cc -------------------------------------------------===// 2// 3// This file is distributed under the University of Illinois Open Source 4// License. See LICENSE.TXT for details. 5// 6//===----------------------------------------------------------------------===// 7// 8// This file is a part of ThreadSanitizer (TSan), a race detector. 9// 10//===----------------------------------------------------------------------===// 11 12#include "tsan_symbolize.h" 13 14#include "sanitizer_common/sanitizer_common.h" 15#include "sanitizer_common/sanitizer_placement_new.h" 16#include "sanitizer_common/sanitizer_symbolizer.h" 17#include "tsan_flags.h" 18#include "tsan_report.h" 19#include "tsan_rtl.h" 20 21namespace __tsan { 22 23void EnterSymbolizer() { 24 ThreadState *thr = cur_thread(); 25 CHECK(!thr->in_symbolizer); 26 thr->in_symbolizer = true; 27 thr->ignore_interceptors++; 28} 29 30void ExitSymbolizer() { 31 ThreadState *thr = cur_thread(); 32 CHECK(thr->in_symbolizer); 33 thr->in_symbolizer = false; 34 thr->ignore_interceptors--; 35} 36 37// Legacy API. 38// May be overriden by JIT/JAVA/etc, 39// whatever produces PCs marked with kExternalPCBit. 40SANITIZER_WEAK_DEFAULT_IMPL 41bool __tsan_symbolize_external(uptr pc, char *func_buf, uptr func_siz, 42 char *file_buf, uptr file_siz, int *line, 43 int *col) { 44 return false; 45} 46 47// New API: call __tsan_symbolize_external_ex only when it exists. 48// Once old clients are gone, provide dummy implementation. 49SANITIZER_WEAK_DEFAULT_IMPL 50void __tsan_symbolize_external_ex(uptr pc, 51 void (*add_frame)(void *, const char *, 52 const char *, int, int), 53 void *ctx) {} 54 55struct SymbolizedStackBuilder { 56 SymbolizedStack *head; 57 SymbolizedStack *tail; 58 uptr addr; 59}; 60 61static void AddFrame(void *ctx, const char *function_name, const char *file, 62 int line, int column) { 63 SymbolizedStackBuilder *ssb = (struct SymbolizedStackBuilder *)ctx; 64 if (ssb->tail) { 65 ssb->tail->next = SymbolizedStack::New(ssb->addr); 66 ssb->tail = ssb->tail->next; 67 } else { 68 ssb->head = ssb->tail = SymbolizedStack::New(ssb->addr); 69 } 70 AddressInfo *info = &ssb->tail->info; 71 if (function_name) { 72 info->function = internal_strdup(function_name); 73 } 74 if (file) { 75 info->file = internal_strdup(file); 76 } 77 info->line = line; 78 info->column = column; 79} 80 81SymbolizedStack *SymbolizeCode(uptr addr) { 82 // Check if PC comes from non-native land. 83 if (addr & kExternalPCBit) { 84 SymbolizedStackBuilder ssb = {nullptr, nullptr, addr}; 85 __tsan_symbolize_external_ex(addr, AddFrame, &ssb); 86 if (ssb.head) 87 return ssb.head; 88 // Legacy code: remove along with the declaration above 89 // once all clients using this API are gone. 90 // Declare static to not consume too much stack space. 91 // We symbolize reports in a single thread, so this is fine. 92 static char func_buf[1024]; 93 static char file_buf[1024]; 94 int line, col; 95 SymbolizedStack *frame = SymbolizedStack::New(addr); 96 if (__tsan_symbolize_external(addr, func_buf, sizeof(func_buf), file_buf, 97 sizeof(file_buf), &line, &col)) { 98 frame->info.function = internal_strdup(func_buf); 99 frame->info.file = internal_strdup(file_buf); 100 frame->info.line = line; 101 frame->info.column = col; 102 } 103 return frame; 104 } 105 return Symbolizer::GetOrInit()->SymbolizePC(addr); 106} 107 108ReportLocation *SymbolizeData(uptr addr) { 109 DataInfo info; 110 if (!Symbolizer::GetOrInit()->SymbolizeData(addr, &info)) 111 return 0; 112 ReportLocation *ent = ReportLocation::New(ReportLocationGlobal); 113 internal_memcpy(&ent->global, &info, sizeof(info)); 114 return ent; 115} 116 117void SymbolizeFlush() { 118 Symbolizer::GetOrInit()->Flush(); 119} 120 121} // namespace __tsan 122