summaryrefslogtreecommitdiff
path: root/xpcom/base/nsDebugImpl.cpp
blob: 96487acda989bcab53581109a6d81f02911cbfa2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// Chromium headers must come before Mozilla headers.
#include "base/process_util.h"

#include "mozilla/Atomics.h"

#include "nsDebugImpl.h"
#include "nsDebug.h"
#include "nsString.h"
#include "nsXULAppAPI.h"
#include "prprf.h"
#include "nsError.h"
#include "prerror.h"
#include "prerr.h"
#include "prenv.h"

#ifdef ANDROID
#include <android/log.h>
#endif

#ifdef _WIN32
/* for getenv() */
#include <stdlib.h>
#endif

#include "nsTraceRefcnt.h"

#if defined(XP_UNIX)
#include <signal.h>
#endif

#if defined(XP_WIN)
#include <tchar.h>
#include "nsString.h"
#endif

#if defined(XP_MACOSX) || defined(__DragonFly__) || defined(__FreeBSD__) \
 || defined(__NetBSD__) || defined(__OpenBSD__)
#include <stdbool.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#endif

#if defined(__OpenBSD__)
#include <sys/proc.h>
#endif

#if defined(__DragonFly__) || defined(__FreeBSD__)
#include <sys/user.h>
#endif

#if defined(__NetBSD__)
#undef KERN_PROC
#define KERN_PROC KERN_PROC2
#define KINFO_PROC struct kinfo_proc2
#else
#define KINFO_PROC struct kinfo_proc
#endif

#if defined(XP_MACOSX)
#define KP_FLAGS kp_proc.p_flag
#elif defined(__DragonFly__)
#define KP_FLAGS kp_flags
#elif defined(__FreeBSD__)
#define KP_FLAGS ki_flag
#elif defined(__OpenBSD__) && !defined(_P_TRACED)
#define KP_FLAGS p_psflags
#define P_TRACED PS_TRACED
#else
#define KP_FLAGS p_flag
#endif

#include "mozilla/mozalloc_abort.h"

static void
Abort(const char* aMsg);

static void
RealBreak();

static void
Break(const char* aMsg);

#if defined(_WIN32)
#include <windows.h>
#include <signal.h>
#include <malloc.h> // for _alloca
#elif defined(XP_UNIX)
#include <stdlib.h>
#endif

using namespace mozilla;

static const char* sMultiprocessDescription = nullptr;

static Atomic<int32_t> gAssertionCount;

NS_IMPL_QUERY_INTERFACE(nsDebugImpl, nsIDebug2)

NS_IMETHODIMP_(MozExternalRefCountType)
nsDebugImpl::AddRef()
{
  return 2;
}

NS_IMETHODIMP_(MozExternalRefCountType)
nsDebugImpl::Release()
{
  return 1;
}

NS_IMETHODIMP
nsDebugImpl::Assertion(const char* aStr, const char* aExpr,
                       const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_ASSERTION, aStr, aExpr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Warning(const char* aStr, const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_WARNING, aStr, nullptr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Break(const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_BREAK, nullptr, nullptr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::Abort(const char* aFile, int32_t aLine)
{
  NS_DebugBreak(NS_DEBUG_ABORT, nullptr, nullptr, aFile, aLine);
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::GetIsDebugBuild(bool* aResult)
{
#ifdef DEBUG
  *aResult = true;
#else
  *aResult = false;
#endif
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::GetAssertionCount(int32_t* aResult)
{
  *aResult = gAssertionCount;
  return NS_OK;
}

NS_IMETHODIMP
nsDebugImpl::GetIsDebuggerAttached(bool* aResult)
{
  *aResult = false;

#if defined(XP_WIN)
  *aResult = ::IsDebuggerPresent();
#elif defined(XP_MACOSX) || defined(__DragonFly__) || defined(__FreeBSD__) \
   || defined(__NetBSD__) || defined(__OpenBSD__)
  // Specify the info we're looking for
  int mib[] = {
    CTL_KERN,
    KERN_PROC,
    KERN_PROC_PID,
    getpid(),
#if defined(__NetBSD__) || defined(__OpenBSD__)
    sizeof(KINFO_PROC),
    1,
#endif
  };
  u_int mibSize = sizeof(mib) / sizeof(int);

  KINFO_PROC info;
  size_t infoSize = sizeof(info);
  memset(&info, 0, infoSize);

  if (sysctl(mib, mibSize, &info, &infoSize, nullptr, 0)) {
    // if the call fails, default to false
    *aResult = false;
    return NS_OK;
  }

  if (info.KP_FLAGS & P_TRACED) {
    *aResult = true;
  }
#endif

  return NS_OK;
}

/* static */ void
nsDebugImpl::SetMultiprocessMode(const char* aDesc)
{
  sMultiprocessDescription = aDesc;
}

/**
 * Implementation of the nsDebug methods. Note that this code is
 * always compiled in, in case some other module that uses it is
 * compiled with debugging even if this library is not.
 */
enum nsAssertBehavior
{
  NS_ASSERT_UNINITIALIZED,
  NS_ASSERT_WARN,
  NS_ASSERT_SUSPEND,
  NS_ASSERT_STACK,
  NS_ASSERT_TRAP,
  NS_ASSERT_ABORT,
  NS_ASSERT_STACK_AND_ABORT
};

static nsAssertBehavior
GetAssertBehavior()
{
  static nsAssertBehavior gAssertBehavior = NS_ASSERT_UNINITIALIZED;
  if (gAssertBehavior != NS_ASSERT_UNINITIALIZED) {
    return gAssertBehavior;
  }

  gAssertBehavior = NS_ASSERT_WARN;

  const char* assertString = PR_GetEnv("XPCOM_DEBUG_BREAK");
  if (!assertString || !*assertString) {
    return gAssertBehavior;
  }
  if (!strcmp(assertString, "warn")) {
    return gAssertBehavior = NS_ASSERT_WARN;
  }
  if (!strcmp(assertString, "suspend")) {
    return gAssertBehavior = NS_ASSERT_SUSPEND;
  }
  if (!strcmp(assertString, "stack")) {
    return gAssertBehavior = NS_ASSERT_STACK;
  }
  if (!strcmp(assertString, "abort")) {
    return gAssertBehavior = NS_ASSERT_ABORT;
  }
  if (!strcmp(assertString, "trap") || !strcmp(assertString, "break")) {
    return gAssertBehavior = NS_ASSERT_TRAP;
  }
  if (!strcmp(assertString, "stack-and-abort")) {
    return gAssertBehavior = NS_ASSERT_STACK_AND_ABORT;
  }

  fprintf(stderr, "Unrecognized value of XPCOM_DEBUG_BREAK\n");
  return gAssertBehavior;
}

struct FixedBuffer
{
  FixedBuffer() : curlen(0)
  {
    buffer[0] = '\0';
  }

  char buffer[500];
  uint32_t curlen;
};

static int
StuffFixedBuffer(void* aClosure, const char* aBuf, uint32_t aLen)
{
  if (!aLen) {
    return 0;
  }

  FixedBuffer* fb = (FixedBuffer*)aClosure;

  // strip the trailing null, we add it again later
  if (aBuf[aLen - 1] == '\0') {
    --aLen;
  }

  if (fb->curlen + aLen >= sizeof(fb->buffer)) {
    aLen = sizeof(fb->buffer) - fb->curlen - 1;
  }

  if (aLen) {
    memcpy(fb->buffer + fb->curlen, aBuf, aLen);
    fb->curlen += aLen;
    fb->buffer[fb->curlen] = '\0';
  }

  return aLen;
}

EXPORT_XPCOM_API(void)
NS_DebugBreak(uint32_t aSeverity, const char* aStr, const char* aExpr,
              const char* aFile, int32_t aLine)
{
  FixedBuffer nonPIDBuf;
  FixedBuffer buf;
  const char* sevString = "WARNING";

  switch (aSeverity) {
    case NS_DEBUG_ASSERTION:
      sevString = "###!!! ASSERTION";
      break;

    case NS_DEBUG_BREAK:
      sevString = "###!!! BREAK";
      break;

    case NS_DEBUG_ABORT:
      sevString = "###!!! ABORT";
      break;

    default:
      aSeverity = NS_DEBUG_WARNING;
  }

#define PRINT_TO_NONPID_BUFFER(...) PR_sxprintf(StuffFixedBuffer, &nonPIDBuf, __VA_ARGS__)
  PRINT_TO_NONPID_BUFFER("%s: ", sevString);
  if (aStr) {
    PRINT_TO_NONPID_BUFFER("%s: ", aStr);
  }
  if (aExpr) {
    PRINT_TO_NONPID_BUFFER("'%s', ", aExpr);
  }
  if (aFile) {
    PRINT_TO_NONPID_BUFFER("file %s, ", aFile);
  }
  if (aLine != -1) {
    PRINT_TO_NONPID_BUFFER("line %d", aLine);
  }
#undef PRINT_TO_NONPID_BUFFER

  // Print "[PID]" or "[Desc PID]" at the beginning of the message.
#define PRINT_TO_BUFFER(...) PR_sxprintf(StuffFixedBuffer, &buf, __VA_ARGS__)
  PRINT_TO_BUFFER("[");
  if (sMultiprocessDescription) {
    PRINT_TO_BUFFER("%s ", sMultiprocessDescription);
  }
  PRINT_TO_BUFFER("%d] %s", base::GetCurrentProcId(), nonPIDBuf.buffer);
#undef PRINT_TO_BUFFER


  // errors on platforms without a debugdlg ring a bell on stderr
#if !defined(XP_WIN)
  if (aSeverity != NS_DEBUG_WARNING) {
    fprintf(stderr, "\07");
  }
#endif

#ifdef ANDROID
  __android_log_print(ANDROID_LOG_INFO, "Gecko", "%s", buf.buffer);
#endif

  // Write the message to stderr unless it's a warning and MOZ_IGNORE_WARNINGS
  // is set.
  if (!(PR_GetEnv("MOZ_IGNORE_WARNINGS") && aSeverity == NS_DEBUG_WARNING)) {
    fprintf(stderr, "%s\n", buf.buffer);
    fflush(stderr);
  }

  switch (aSeverity) {
    case NS_DEBUG_WARNING:
      return;

    case NS_DEBUG_BREAK:
      Break(buf.buffer);
      return;

    case NS_DEBUG_ABORT: {
#if defined(DEBUG) && defined(_WIN32)
      RealBreak();
#endif
#if defined(DEBUG)
      nsTraceRefcnt::WalkTheStack(stderr);
#endif
      Abort(buf.buffer);
      return;
    }
  }

  // Now we deal with assertions
  gAssertionCount++;

  switch (GetAssertBehavior()) {
    case NS_ASSERT_WARN:
      return;

    case NS_ASSERT_SUSPEND:
#ifdef XP_UNIX
      fprintf(stderr, "Suspending process; attach with the debugger.\n");
      kill(0, SIGSTOP);
#else
      Break(buf.buffer);
#endif
      return;

    case NS_ASSERT_STACK:
      nsTraceRefcnt::WalkTheStack(stderr);
      return;

    case NS_ASSERT_STACK_AND_ABORT:
      nsTraceRefcnt::WalkTheStack(stderr);
      // Fall through to abort
      MOZ_FALLTHROUGH;

    case NS_ASSERT_ABORT:
      Abort(buf.buffer);
      return;

    case NS_ASSERT_TRAP:
    case NS_ASSERT_UNINITIALIZED: // Default to "trap" behavior
      Break(buf.buffer);
      return;
  }
}

static void
Abort(const char* aMsg)
{
  mozalloc_abort(aMsg);
}

static void
RealBreak()
{
#if defined(_WIN32)
  ::DebugBreak();
#elif defined(XP_MACOSX)
  raise(SIGTRAP);
#elif defined(__GNUC__) && (defined(__i386__) || defined(__i386) || defined(__x86_64__))
  asm("int $3");
#elif defined(__arm__)
  asm(
#ifdef __ARM_ARCH_4T__
    /* ARMv4T doesn't support the BKPT instruction, so if the compiler target
     * is ARMv4T, we want to ensure the assembler will understand that ARMv5T
     * instruction, while keeping the resulting object tagged as ARMv4T.
     */
    ".arch armv5t\n"
    ".object_arch armv4t\n"
#endif
    "BKPT #0");
#elif defined(SOLARIS)
#if defined(__i386__) || defined(__i386) || defined(__x86_64__)
  asm("int $3");
#else
  raise(SIGTRAP);
#endif
#else
#warning do not know how to break on this platform
#endif
}

// Abort() calls this function, don't call it!
static void
Break(const char* aMsg)
{
#if defined(_WIN32)
  static int ignoreDebugger;
  if (!ignoreDebugger) {
    const char* shouldIgnoreDebugger = getenv("XPCOM_DEBUG_DLG");
    ignoreDebugger =
      1 + (shouldIgnoreDebugger && !strcmp(shouldIgnoreDebugger, "1"));
  }
  if ((ignoreDebugger == 2) || !::IsDebuggerPresent()) {
    DWORD code = IDRETRY;

    /* Create the debug dialog out of process to avoid the crashes caused by
     * Windows events leaking into our event loop from an in process dialog.
     * We do this by launching windbgdlg.exe (built in xpcom/windbgdlg).
     * See http://bugzilla.mozilla.org/show_bug.cgi?id=54792
     */
    PROCESS_INFORMATION pi;
    STARTUPINFOW si;
    wchar_t executable[MAX_PATH];
    wchar_t* pName;

    memset(&pi, 0, sizeof(pi));

    memset(&si, 0, sizeof(si));
    si.cb          = sizeof(si);
    si.wShowWindow = SW_SHOW;

    // 2nd arg of CreateProcess is in/out
    wchar_t* msgCopy = (wchar_t*)_alloca((strlen(aMsg) + 1) * sizeof(wchar_t));
    wcscpy(msgCopy, NS_ConvertUTF8toUTF16(aMsg).get());

    if (GetModuleFileNameW(GetModuleHandleW(L"xpcom.dll"), executable, MAX_PATH) &&
        (pName = wcsrchr(executable, '\\')) != nullptr &&
        wcscpy(pName + 1, L"windbgdlg.exe") &&
        CreateProcessW(executable, msgCopy, nullptr, nullptr,
                       false, DETACHED_PROCESS | NORMAL_PRIORITY_CLASS,
                       nullptr, nullptr, &si, &pi)) {
      WaitForSingleObject(pi.hProcess, INFINITE);
      GetExitCodeProcess(pi.hProcess, &code);
      CloseHandle(pi.hProcess);
      CloseHandle(pi.hThread);
    }

    switch (code) {
      case IDABORT:
        //This should exit us
        raise(SIGABRT);
        //If we are ignored exit this way..
        _exit(3);

      case IDIGNORE:
        return;
    }
  }

  RealBreak();
#elif defined(XP_MACOSX)
  /* Note that we put this Mac OS X test above the GNUC/x86 test because the
   * GNUC/x86 test is also true on Intel Mac OS X and we want the PPC/x86
   * impls to be the same.
   */
  RealBreak();
#elif defined(__GNUC__) && (defined(__i386__) || defined(__i386) || defined(__x86_64__))
  RealBreak();
#elif defined(__arm__)
  RealBreak();
#elif defined(SOLARIS)
  RealBreak();
#else
#warning do not know how to break on this platform
#endif
}

nsresult
nsDebugImpl::Create(nsISupports* aOuter, const nsIID& aIID, void** aInstancePtr)
{
  static const nsDebugImpl* sImpl;

  if (NS_WARN_IF(aOuter)) {
    return NS_ERROR_NO_AGGREGATION;
  }

  if (!sImpl) {
    sImpl = new nsDebugImpl();
  }

  return const_cast<nsDebugImpl*>(sImpl)->QueryInterface(aIID, aInstancePtr);
}

////////////////////////////////////////////////////////////////////////////////

nsresult
NS_ErrorAccordingToNSPR()
{
  PRErrorCode err = PR_GetError();
  switch (err) {
    case PR_OUT_OF_MEMORY_ERROR:         return NS_ERROR_OUT_OF_MEMORY;
    case PR_WOULD_BLOCK_ERROR:           return NS_BASE_STREAM_WOULD_BLOCK;
    case PR_FILE_NOT_FOUND_ERROR:        return NS_ERROR_FILE_NOT_FOUND;
    case PR_READ_ONLY_FILESYSTEM_ERROR:  return NS_ERROR_FILE_READ_ONLY;
    case PR_NOT_DIRECTORY_ERROR:         return NS_ERROR_FILE_NOT_DIRECTORY;
    case PR_IS_DIRECTORY_ERROR:          return NS_ERROR_FILE_IS_DIRECTORY;
    case PR_LOOP_ERROR:                  return NS_ERROR_FILE_UNRESOLVABLE_SYMLINK;
    case PR_FILE_EXISTS_ERROR:           return NS_ERROR_FILE_ALREADY_EXISTS;
    case PR_FILE_IS_LOCKED_ERROR:        return NS_ERROR_FILE_IS_LOCKED;
    case PR_FILE_TOO_BIG_ERROR:          return NS_ERROR_FILE_TOO_BIG;
    case PR_NO_DEVICE_SPACE_ERROR:       return NS_ERROR_FILE_NO_DEVICE_SPACE;
    case PR_NAME_TOO_LONG_ERROR:         return NS_ERROR_FILE_NAME_TOO_LONG;
    case PR_DIRECTORY_NOT_EMPTY_ERROR:   return NS_ERROR_FILE_DIR_NOT_EMPTY;
    case PR_NO_ACCESS_RIGHTS_ERROR:      return NS_ERROR_FILE_ACCESS_DENIED;
    default:                             return NS_ERROR_FAILURE;
  }
}

void
NS_ABORT_OOM(size_t aSize)
{
  MOZ_CRASH("OOM");
}