asan_win.cc revision c11fa095b344c1423ba76822d5bde122b1676223 
1//===-- asan_win.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 AddressSanitizer, an address sanity checker.
11//
12// Windows-specific details.
13//===----------------------------------------------------------------------===//
14
15#include "sanitizer_common/sanitizer_platform.h"
16#if SANITIZER_WINDOWS
17#include <windows.h>
18
19#include <dbghelp.h>
20#include <stdlib.h>
21
22#include "asan_interceptors.h"
23#include "asan_internal.h"
24#include "asan_thread.h"
25#include "sanitizer_common/sanitizer_libc.h"
26#include "sanitizer_common/sanitizer_mutex.h"
27
28extern "C" {
29  SANITIZER_INTERFACE_ATTRIBUTE
30  bool __asan_should_detect_stack_use_after_return() {
31    __asan_init();
32    return __asan_option_detect_stack_use_after_return;
33  }
34}
35
36namespace __asan {
37
38// ---------------------- Stacktraces, symbols, etc. ---------------- {{{1
39static BlockingMutex dbghelp_lock(LINKER_INITIALIZED);
40static bool dbghelp_initialized = false;
41#pragma comment(lib, "dbghelp.lib")
42
43// ---------------------- TSD ---------------- {{{1
44static bool tsd_key_inited = false;
45
46static __declspec(thread) void *fake_tsd = 0;
47
48void AsanTSDInit(void (*destructor)(void *tsd)) {
49  // FIXME: we're ignoring the destructor for now.
50  tsd_key_inited = true;
51}
52
53void *AsanTSDGet() {
54  CHECK(tsd_key_inited);
55  return fake_tsd;
56}
57
58void AsanTSDSet(void *tsd) {
59  CHECK(tsd_key_inited);
60  fake_tsd = tsd;
61}
62
63// ---------------------- Various stuff ---------------- {{{1
64void MaybeReexec() {
65  // No need to re-exec on Windows.
66}
67
68void *AsanDoesNotSupportStaticLinkage() {
69#if defined(_DEBUG)
70#error Please build the runtime with a non-debug CRT: /MD or /MT
71#endif
72  return 0;
73}
74
75void SetAlternateSignalStack() {
76  // FIXME: Decide what to do on Windows.
77}
78
79void UnsetAlternateSignalStack() {
80  // FIXME: Decide what to do on Windows.
81}
82
83void InstallSignalHandlers() {
84  // FIXME: Decide what to do on Windows.
85}
86
87void AsanPlatformThreadInit() {
88  // Nothing here for now.
89}
90
91void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
92  UNIMPLEMENTED();
93}
94
95}  // namespace __asan
96
97// ---------------------- Interface ---------------- {{{1
98using namespace __asan;  // NOLINT
99
100extern "C" {
101SANITIZER_INTERFACE_ATTRIBUTE NOINLINE
102bool __asan_symbolize(const void *addr, char *out_buffer, int buffer_size) {
103  BlockingMutexLock lock(&dbghelp_lock);
104  if (!dbghelp_initialized) {
105    SymSetOptions(SYMOPT_DEFERRED_LOADS |
106                  SYMOPT_UNDNAME |
107                  SYMOPT_LOAD_LINES);
108    CHECK(SymInitialize(GetCurrentProcess(), 0, TRUE));
109    // FIXME: We don't call SymCleanup() on exit yet - should we?
110    dbghelp_initialized = true;
111  }
112
113  // See http://msdn.microsoft.com/en-us/library/ms680578(VS.85).aspx
114  char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(CHAR)];
115  PSYMBOL_INFO symbol = (PSYMBOL_INFO)buffer;
116  symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
117  symbol->MaxNameLen = MAX_SYM_NAME;
118  DWORD64 offset = 0;
119  BOOL got_objname = SymFromAddr(GetCurrentProcess(),
120                                 (DWORD64)addr, &offset, symbol);
121  if (!got_objname)
122    return false;
123
124  DWORD  unused;
125  IMAGEHLP_LINE64 info;
126  info.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
127  BOOL got_fileline = SymGetLineFromAddr64(GetCurrentProcess(),
128                                           (DWORD64)addr, &unused, &info);
129  int written = 0;
130  out_buffer[0] = '\0';
131  // FIXME: it might be useful to print out 'obj' or 'obj+offset' info too.
132  if (got_fileline) {
133    written += internal_snprintf(out_buffer + written, buffer_size - written,
134                        " %s %s:%d", symbol->Name,
135                        info.FileName, info.LineNumber);
136  } else {
137    written += internal_snprintf(out_buffer + written, buffer_size - written,
138                        " %s+0x%p", symbol->Name, offset);
139  }
140  return true;
141}
142}  // extern "C"
143
144
145#endif  // _WIN32
146