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1//===-- tsan_symbolize.cpp ------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file is a part of ThreadSanitizer (TSan), a race detector.
10//
11//===----------------------------------------------------------------------===//
12
13#include "tsan_symbolize.h"
14
15#include "sanitizer_common/sanitizer_common.h"
16#include "sanitizer_common/sanitizer_placement_new.h"
17#include "sanitizer_common/sanitizer_symbolizer.h"
18#include "tsan_flags.h"
19#include "tsan_report.h"
20#include "tsan_rtl.h"
21
22namespace __tsan {
23
24void EnterSymbolizer() {
25 ThreadState *thr = cur_thread();
26 CHECK(!thr->in_symbolizer);
27 thr->in_symbolizer = true;
28 thr->ignore_interceptors++;
29}
30
31void ExitSymbolizer() {
32 ThreadState *thr = cur_thread();
33 CHECK(thr->in_symbolizer);
34 thr->in_symbolizer = false;
35 thr->ignore_interceptors--;
36}
37
38// Legacy API.
39// May be overriden by JIT/JAVA/etc,
40// whatever produces PCs marked with kExternalPCBit.
41SANITIZER_WEAK_DEFAULT_IMPL
42bool __tsan_symbolize_external(uptr pc, char *func_buf, uptr func_siz,
43 char *file_buf, uptr file_siz, int *line,
44 int *col) {
45 return false;
46}
47
48// New API: call __tsan_symbolize_external_ex only when it exists.
49// Once old clients are gone, provide dummy implementation.
50SANITIZER_WEAK_DEFAULT_IMPL
51void __tsan_symbolize_external_ex(uptr pc,
52 void (*add_frame)(void *, const char *,
53 const char *, int, int),
54 void *ctx) {}
55
56struct SymbolizedStackBuilder {
57 SymbolizedStack *head;
58 SymbolizedStack *tail;
59 uptr addr;
60};
61
62static void AddFrame(void *ctx, const char *function_name, const char *file,
63 int line, int column) {
64 SymbolizedStackBuilder *ssb = (struct SymbolizedStackBuilder *)ctx;
65 if (ssb->tail) {
66 ssb->tail->next = SymbolizedStack::New(ssb->addr);
67 ssb->tail = ssb->tail->next;
68 } else {
69 ssb->head = ssb->tail = SymbolizedStack::New(ssb->addr);
70 }
71 AddressInfo *info = &ssb->tail->info;
72 if (function_name) {
73 info->function = internal_strdup(function_name);
74 }
75 if (file) {
76 info->file = internal_strdup(file);
77 }
78 info->line = line;
79 info->column = column;
80}
81
82SymbolizedStack *SymbolizeCode(uptr addr) {
83 // Check if PC comes from non-native land.
84 if (addr & kExternalPCBit) {
85 SymbolizedStackBuilder ssb = {nullptr, nullptr, addr};
86 __tsan_symbolize_external_ex(addr, AddFrame, &ssb);
87 if (ssb.head)
88 return ssb.head;
89 // Legacy code: remove along with the declaration above
90 // once all clients using this API are gone.
91 // Declare static to not consume too much stack space.
92 // We symbolize reports in a single thread, so this is fine.
93 static char func_buf[1024];
94 static char file_buf[1024];
95 int line, col;
96 SymbolizedStack *frame = SymbolizedStack::New(addr);
97 if (__tsan_symbolize_external(addr, func_buf, sizeof(func_buf), file_buf,
98 sizeof(file_buf), &line, &col)) {
99 frame->info.function = internal_strdup(func_buf);
100 frame->info.file = internal_strdup(file_buf);
101 frame->info.line = line;
102 frame->info.column = col;
103 }
104 return frame;
105 }
106 return Symbolizer::GetOrInit()->SymbolizePC(addr);
107}
108
109ReportLocation *SymbolizeData(uptr addr) {
110 DataInfo info;
111 if (!Symbolizer::GetOrInit()->SymbolizeData(addr, &info))
112 return 0;
113 auto *ent = New<ReportLocation>();
114 ent->type = ReportLocationGlobal;
115 internal_memcpy(&ent->global, &info, sizeof(info));
116 return ent;
117}
118
119void SymbolizeFlush() {
120 Symbolizer::GetOrInit()->Flush();
121}
122
123} // namespace __tsan