1/*
2  This file is part of drd, a thread error detector.
3
4  Copyright (C) 2006-2013 Bart Van Assche <bvanassche@acm.org>.
5
6  This program is free software; you can redistribute it and/or
7  modify it under the terms of the GNU General Public License as
8  published by the Free Software Foundation; either version 2 of the
9  License, or (at your option) any later version.
10
11  This program is distributed in the hope that it will be useful, but
12  WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  General Public License for more details.
15
16  You should have received a copy of the GNU General Public License
17  along with this program; if not, write to the Free Software
18  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19  02111-1307, USA.
20
21  The GNU General Public License is contained in the file COPYING.
22*/
23
24
25#include "drd_clientobj.h"        /* struct mutex_info        */
26#include "drd_error.h"
27#include "drd_malloc_wrappers.h"
28#include "drd_mutex.h"
29#include "drd_suppression.h"      /* drd_start_suppression()  */
30#include "pub_drd_bitmap.h"       /* LHS_W, ...               */
31#include "pub_tool_vki.h"
32#include "pub_tool_basics.h"
33#include "pub_tool_libcassert.h"  /* tl_assert()              */
34#include "pub_tool_libcbase.h"    /* strlen()                 */
35#include "pub_tool_libcfile.h"    /* VG_(get_startup_wd)()    */
36#include "pub_tool_libcprint.h"   /* VG_(printf)()            */
37#include "pub_tool_machine.h"
38#include "pub_tool_mallocfree.h"  /* VG_(malloc), VG_(free)   */
39#include "pub_tool_options.h"     /* VG_(clo_xml)             */
40#include "pub_tool_threadstate.h" /* VG_(get_pthread_id)()    */
41#include "pub_tool_tooliface.h"   /* VG_(needs_tool_errors)() */
42
43
44/* Local function declarations. */
45
46static const HChar* drd_get_error_name(Error* e);
47
48
49/* Local variables. */
50
51static Bool s_show_conflicting_segments = True;
52
53
54void DRD_(set_show_conflicting_segments)(const Bool scs)
55{
56   s_show_conflicting_segments = scs;
57}
58
59void DRD_(trace_msg)(const HChar* format, ...)
60{
61   va_list vargs;
62   va_start(vargs, format);
63   if (VG_(clo_xml)) {
64      VG_(printf_xml)("  <trace><text>");
65      VG_(vprintf_xml)(format, vargs);
66      VG_(printf_xml)("</text></trace>\n");
67   } else {
68      VG_(vmessage)(Vg_UserMsg, format, vargs);
69      VG_(message)(Vg_UserMsg, "\n");
70   }
71   va_end(vargs);
72}
73
74void DRD_(trace_msg_w_bt)(const HChar* format, ...)
75{
76   va_list vargs;
77   va_start(vargs, format);
78   if (VG_(clo_xml)) {
79      VG_(printf_xml)("  <trace><text>");
80      VG_(vprintf_xml)(format, vargs);
81      VG_(printf_xml)("</text>\n");
82   } else {
83      VG_(vmessage)(Vg_UserMsg, format, vargs);
84      VG_(message)(Vg_UserMsg, "\n");
85   }
86   VG_(get_and_pp_StackTrace)(VG_(get_running_tid)(), VG_(clo_backtrace_size));
87   va_end(vargs);
88   if (VG_(clo_xml))
89      VG_(printf_xml)("  </trace>\n");
90}
91
92/**
93 * Emit error message detail in the format requested by the user.
94 */
95static void print_err_detail(const HChar* format, ...) PRINTF_CHECK(1, 2);
96static void print_err_detail(const HChar* format, ...)
97{
98   va_list vargs;
99   va_start(vargs, format);
100   if (VG_(clo_xml))
101      VG_(vprintf_xml)(format, vargs);
102   else
103      VG_(vmessage)(Vg_UserMsg, format, vargs);
104   va_end(vargs);
105}
106
107/**
108 * Describe the client address a as good as possible, putting the result in ai.
109 */
110static
111void describe_malloced_addr(Addr const a, AddrInfo* const ai)
112{
113   Addr heap_block_start;
114
115   if (DRD_(heap_addrinfo)(a, &heap_block_start, &ai->size, &ai->lastchange))
116   {
117      ai->akind = eMallocd;
118      ai->rwoffset = a - heap_block_start;
119   }
120   else
121   {
122      ai->akind = eUnknown;
123   }
124}
125
126/**
127 * Report where a client synchronization object has been observed for the first
128 * time. The printed call stack will either refer to a pthread_*_init() or a
129 * pthread_*lock() call.
130 */
131static void first_observed(const Addr obj)
132{
133   DrdClientobj* cl;
134
135   cl = DRD_(clientobj_get_any)(obj);
136   if (cl) {
137      tl_assert(cl->any.first_observed_at);
138      if (VG_(clo_xml)) {
139         print_err_detail("  <first_observed_at>\n"
140                          "    <what>%pS</what>\n"
141                          "    <address>0x%lx</address>\n",
142                          DRD_(clientobj_type_name)(cl->any.type), obj);
143         VG_(pp_ExeContext)(cl->any.first_observed_at);
144         print_err_detail("  </first_observed_at>\n");
145      } else {
146         print_err_detail("%s 0x%lx was first observed at:\n",
147                          DRD_(clientobj_type_name)(cl->any.type), obj);
148         VG_(pp_ExeContext)(cl->any.first_observed_at);
149      }
150   }
151}
152
153static
154void drd_report_data_race(Error* const err, const DataRaceErrInfo* const dri)
155{
156   const Bool xml = VG_(clo_xml);
157   const HChar* const what_prefix = xml ? "  <what>" : "";
158   const HChar* const what_suffix = xml ? "</what>" : "";
159   const HChar* const auxwhat_prefix = xml ? "  <auxwhat>" : "";
160   const HChar* const auxwhat_suffix = xml ? "</auxwhat>" : "";
161   const HChar* const indent = xml ? "  " : "";
162   AddrInfo ai;
163
164   XArray* /* of HChar */ descr1
165      = VG_(newXA)( VG_(malloc), "drd.error.drdr2.1",
166                    VG_(free), sizeof(HChar) );
167   XArray* /* of HChar */ descr2
168      = VG_(newXA)( VG_(malloc), "drd.error.drdr2.2",
169                    VG_(free), sizeof(HChar) );
170
171   tl_assert(dri);
172   tl_assert(dri->addr);
173   tl_assert(dri->size > 0);
174   tl_assert(descr1);
175   tl_assert(descr2);
176
177   (void) VG_(get_data_description)(descr1, descr2, dri->addr);
178   /* If there's nothing in descr1/2, free them.  Why is it safe to to
179      VG_(indexXA) at zero here?  Because VG_(get_data_description)
180      guarantees to zero terminate descr1/2 regardless of the outcome
181      of the call.  So there's always at least one element in each XA
182      after the call.
183   */
184   if (0 == VG_(strlen)( VG_(indexXA)( descr1, 0 ))) {
185      VG_(deleteXA)( descr1 );
186      descr1 = NULL;
187   }
188   if (0 == VG_(strlen)( VG_(indexXA)( descr2, 0 ))) {
189      VG_(deleteXA)( descr2 );
190      descr2 = NULL;
191   }
192   /* Assume (assert) that VG_(get_data_description) fills in descr1
193      before it fills in descr2 */
194   if (descr1 == NULL)
195      tl_assert(descr2 == NULL);
196   /* So anyway.  Do we have something useful? */
197   if (descr1 == NULL)
198   {
199      /* No.  Do Plan B. */
200      describe_malloced_addr(dri->addr, &ai);
201   }
202
203   print_err_detail("%sConflicting %s by thread %d at 0x%08lx size %ld%s\n",
204                    what_prefix, dri->access_type == eStore ? "store" : "load",
205                    dri->tid, dri->addr, dri->size, what_suffix);
206
207   VG_(pp_ExeContext)(VG_(get_error_where)(err));
208   if (descr1 != NULL) {
209      print_err_detail("%s%s\n", indent, (HChar*)VG_(indexXA)(descr1, 0));
210      if (descr2 != NULL)
211         print_err_detail("%s%s\n", indent, (HChar*)VG_(indexXA)(descr2, 0));
212   } else if (ai.akind == eMallocd && ai.lastchange) {
213      print_err_detail("%sAddress 0x%lx is at offset %ld from 0x%lx.%s%s",
214                       auxwhat_prefix, dri->addr, ai.rwoffset,
215                       dri->addr - ai.rwoffset, auxwhat_suffix,
216                       xml ? "\n" : "");
217      if (xml)
218         print_err_detail("  <allocation_context>\n");
219      else
220         print_err_detail(" Allocation context:\n");
221      VG_(pp_ExeContext)(ai.lastchange);
222      if (xml)
223         print_err_detail("  </allocation_context>\n");
224   } else {
225      HChar sect_name[64];
226      VgSectKind sect_kind;
227
228      sect_kind = VG_(DebugInfo_sect_kind)(sect_name, sizeof(sect_name),
229                                           dri->addr);
230      if (sect_kind != Vg_SectUnknown) {
231         print_err_detail("%sAllocation context: %ps section of %ps%s\n",
232                          auxwhat_prefix, VG_(pp_SectKind)(sect_kind),
233                          sect_name, auxwhat_suffix);
234      } else {
235         print_err_detail("%sAllocation context: unknown.%s\n",
236                          auxwhat_prefix, auxwhat_suffix);
237      }
238   }
239   if (s_show_conflicting_segments)
240   {
241      DRD_(thread_report_conflicting_segments)(dri->tid,
242                                               dri->addr, dri->size,
243                                               dri->access_type);
244   }
245
246   if (descr2)
247      VG_(deleteXA)(descr2);
248   if (descr1)
249      VG_(deleteXA)(descr1);
250}
251
252/**
253 * Compare two error contexts. The core function VG_(maybe_record_error)()
254 * calls this function to compare error contexts such that errors that occur
255 * repeatedly are only printed once. This function is only called by the core
256 * if the error kind of e1 and e2 matches and if the ExeContext's of e1 and
257 * e2 also match.
258 */
259static Bool drd_compare_error_contexts(VgRes res, Error* e1, Error* e2)
260{
261   tl_assert(VG_(get_error_kind)(e1) == VG_(get_error_kind)(e2));
262
263   switch (VG_(get_error_kind)(e1))
264   {
265   case DataRaceErr:
266   {
267      const DataRaceErrInfo* const dri1 = VG_(get_error_extra)(e1);
268      const DataRaceErrInfo* const dri2 = VG_(get_error_extra)(e2);
269      return dri1->access_type == dri2->access_type
270	     && dri1->size == dri2->size;
271   }
272   case MutexErr:
273   {
274      const MutexErrInfo* const mei1 = VG_(get_error_extra)(e1);
275      const MutexErrInfo* const mei2 = VG_(get_error_extra)(e2);
276      return mei1->mutex == mei2->mutex;
277   }
278   default:
279      return True;
280   }
281}
282
283/**
284 * Called by the core just before an error message will be printed. Used by
285 * DRD to print the thread number as a preamble.
286 */
287static void drd_tool_error_before_pp(Error* const e)
288{
289   static DrdThreadId s_last_tid_printed = 1;
290   DrdThreadId* err_extra;
291
292   err_extra = VG_(get_error_extra)(e);
293
294   if (err_extra && *err_extra != s_last_tid_printed && !VG_(clo_xml)) {
295      VG_(umsg)("%s:\n", DRD_(thread_get_name)(*err_extra));
296      s_last_tid_printed = *err_extra;
297   }
298}
299
300/** Report an error to the user. */
301static void drd_tool_error_pp(Error* const e)
302{
303   const Bool xml = VG_(clo_xml);
304   const HChar* const what_prefix = xml ? "  <what>" : "";
305   const HChar* const what_suffix = xml ? "</what>" : "";
306
307   if (xml)
308      VG_(printf_xml)( "  <kind>%pS</kind>\n", drd_get_error_name(e));
309
310   switch (VG_(get_error_kind)(e))
311   {
312   case DataRaceErr: {
313      drd_report_data_race(e, VG_(get_error_extra)(e));
314      break;
315   }
316   case MutexErr: {
317      MutexErrInfo* p = (MutexErrInfo*)(VG_(get_error_extra)(e));
318      tl_assert(p);
319      if (p->recursion_count >= 0) {
320         print_err_detail("%s%s: mutex 0x%lx, recursion count %d, owner %d."
321                          "%s\n", what_prefix, VG_(get_error_string)(e),
322                          p->mutex, p->recursion_count, p->owner, what_suffix);
323      } else {
324         print_err_detail("%sThe object at address 0x%lx is not a mutex.%s\n",
325                          what_prefix, p->mutex, what_suffix);
326      }
327      VG_(pp_ExeContext)(VG_(get_error_where)(e));
328      first_observed(p->mutex);
329      break;
330   }
331   case CondErr: {
332      CondErrInfo* cdei =(CondErrInfo*)(VG_(get_error_extra)(e));
333      print_err_detail("%s%s: cond 0x%lx%s\n", what_prefix,
334                       VG_(get_error_string)(e), cdei->cond, what_suffix);
335      VG_(pp_ExeContext)(VG_(get_error_where)(e));
336      first_observed(cdei->cond);
337      break;
338   }
339   case CondDestrErr: {
340      CondDestrErrInfo* cdi = (CondDestrErrInfo*)(VG_(get_error_extra)(e));
341      print_err_detail("%s%s: cond 0x%lx, mutex 0x%lx locked by thread %d%s\n",
342                       what_prefix, VG_(get_error_string)(e), cdi->cond,
343                       cdi->mutex, cdi->owner, what_suffix);
344      VG_(pp_ExeContext)(VG_(get_error_where)(e));
345      first_observed(cdi->mutex);
346      break;
347   }
348   case CondRaceErr: {
349      CondRaceErrInfo* cei = (CondRaceErrInfo*)(VG_(get_error_extra)(e));
350      print_err_detail("%sProbably a race condition: condition variable 0x%lx"
351                       " has been signaled but the associated mutex 0x%lx is"
352                       " not locked by the signalling thread.%s\n",
353                       what_prefix, cei->cond, cei->mutex, what_suffix);
354      VG_(pp_ExeContext)(VG_(get_error_where)(e));
355      first_observed(cei->cond);
356      first_observed(cei->mutex);
357      break;
358   }
359   case CondWaitErr: {
360      CondWaitErrInfo* cwei = (CondWaitErrInfo*)(VG_(get_error_extra)(e));
361      print_err_detail("%s%s: condition variable 0x%lx, mutexes 0x%lx and"
362                       " 0x%lx%s\n", what_prefix, VG_(get_error_string)(e),
363                       cwei->cond, cwei->mutex1, cwei->mutex2, what_suffix);
364      VG_(pp_ExeContext)(VG_(get_error_where)(e));
365      first_observed(cwei->cond);
366      first_observed(cwei->mutex1);
367      first_observed(cwei->mutex2);
368      break;
369   }
370   case SemaphoreErr: {
371      SemaphoreErrInfo* sei = (SemaphoreErrInfo*)(VG_(get_error_extra)(e));
372      tl_assert(sei);
373      print_err_detail("%s%s: semaphore 0x%lx%s\n", what_prefix,
374                       VG_(get_error_string)(e), sei->semaphore, what_suffix);
375      VG_(pp_ExeContext)(VG_(get_error_where)(e));
376      first_observed(sei->semaphore);
377      break;
378   }
379   case BarrierErr: {
380      BarrierErrInfo* bei = (BarrierErrInfo*)(VG_(get_error_extra)(e));
381      tl_assert(bei);
382      print_err_detail("%s%s: barrier 0x%lx%s\n", what_prefix,
383                       VG_(get_error_string)(e), bei->barrier, what_suffix);
384      VG_(pp_ExeContext)(VG_(get_error_where)(e));
385      if (bei->other_context) {
386         if (xml)
387            print_err_detail("  <confl_wait_call>\n");
388         print_err_detail("%sConflicting wait call by thread %d:%s\n",
389                          what_prefix, bei->other_tid, what_suffix);
390         VG_(pp_ExeContext)(bei->other_context);
391         if (xml)
392            print_err_detail("  </confl_wait_call>\n");
393      }
394      first_observed(bei->barrier);
395      break;
396   }
397   case RwlockErr: {
398      RwlockErrInfo* p = (RwlockErrInfo*)(VG_(get_error_extra)(e));
399      tl_assert(p);
400      print_err_detail("%s%s: rwlock 0x%lx.%s\n", what_prefix,
401                       VG_(get_error_string)(e), p->rwlock, what_suffix);
402      VG_(pp_ExeContext)(VG_(get_error_where)(e));
403      first_observed(p->rwlock);
404      break;
405   }
406   case HoldtimeErr: {
407      HoldtimeErrInfo* p =(HoldtimeErrInfo*)(VG_(get_error_extra)(e));
408      tl_assert(p);
409      tl_assert(p->acquired_at);
410      if (xml)
411         print_err_detail("  <acquired_at>\n");
412      else
413         print_err_detail("Acquired at:\n");
414      VG_(pp_ExeContext)(p->acquired_at);
415      if (xml)
416         print_err_detail("  </acquired_at>\n");
417      print_err_detail("%sLock on %s 0x%lx was held during %d ms"
418                       " (threshold: %d ms).%s\n", what_prefix,
419                       VG_(get_error_string)(e), p->synchronization_object,
420                       p->hold_time_ms, p->threshold_ms, what_suffix);
421      VG_(pp_ExeContext)(VG_(get_error_where)(e));
422      first_observed(p->synchronization_object);
423      break;
424   }
425   case GenericErr: {
426      GenericErrInfo* gei = (GenericErrInfo*)(VG_(get_error_extra)(e));
427      print_err_detail("%s%s%s\n", what_prefix, VG_(get_error_string)(e),
428                       what_suffix);
429      VG_(pp_ExeContext)(VG_(get_error_where)(e));
430      if (gei->addr)
431	 first_observed(gei->addr);
432      break;
433   }
434   case InvalidThreadId: {
435      InvalidThreadIdInfo* iti =(InvalidThreadIdInfo*)(VG_(get_error_extra)(e));
436      print_err_detail("%s%s 0x%llx%s\n", what_prefix, VG_(get_error_string)(e),
437                       iti->ptid, what_suffix);
438      VG_(pp_ExeContext)(VG_(get_error_where)(e));
439      break;
440   }
441   case UnimpHgClReq: {
442      UnimpClReqInfo* uicr =(UnimpClReqInfo*)(VG_(get_error_extra)(e));
443      print_err_detail("%sThe annotation macro %s has not yet been implemented"
444                       " in %ps%s\n", what_prefix, uicr->descr,
445                       "<valgrind/helgrind.h>", what_suffix);
446      VG_(pp_ExeContext)(VG_(get_error_where)(e));
447      break;
448   }
449   case UnimpDrdClReq: {
450      UnimpClReqInfo* uicr =(UnimpClReqInfo*)(VG_(get_error_extra)(e));
451      print_err_detail("%sThe annotation macro %s has not yet been implemented"
452                       " in %ps%s\n", what_prefix, uicr->descr,
453                       "<valgrind/drd.h>", what_suffix);
454      VG_(pp_ExeContext)(VG_(get_error_where)(e));
455      break;
456   }
457   default:
458      print_err_detail("%s%s%s\n", what_prefix, VG_(get_error_string)(e),
459                       what_suffix);
460      VG_(pp_ExeContext)(VG_(get_error_where)(e));
461      break;
462   }
463}
464
465static UInt drd_tool_error_update_extra(Error* e)
466{
467   switch (VG_(get_error_kind)(e))
468   {
469   case DataRaceErr:
470      return sizeof(DataRaceErrInfo);
471   case MutexErr:
472      return sizeof(MutexErrInfo);
473   case CondErr:
474      return sizeof(CondErrInfo);
475   case CondDestrErr:
476      return sizeof(CondDestrErrInfo);
477   case CondRaceErr:
478      return sizeof(CondRaceErrInfo);
479   case CondWaitErr:
480      return sizeof(CondWaitErrInfo);
481   case SemaphoreErr:
482      return sizeof(SemaphoreErrInfo);
483   case BarrierErr:
484      return sizeof(BarrierErrInfo);
485   case RwlockErr:
486      return sizeof(RwlockErrInfo);
487   case HoldtimeErr:
488      return sizeof(HoldtimeErrInfo);
489   case GenericErr:
490      return sizeof(GenericErrInfo);
491   case InvalidThreadId:
492      return sizeof(InvalidThreadIdInfo);
493   case UnimpHgClReq:
494      return sizeof(UnimpClReqInfo);
495   case UnimpDrdClReq:
496      return sizeof(UnimpClReqInfo);
497   default:
498      tl_assert(False);
499      break;
500   }
501}
502
503/**
504 * Parse suppression name.
505 *
506 * The suppression types recognized by DRD are the same types as the error
507 * types supported by DRD. So try to match the suppression name against the
508 * names of DRD error types.
509 */
510static Bool drd_is_recognized_suppression(const HChar* const name,
511                                          Supp* const supp)
512{
513   DrdErrorKind skind = 0;
514
515   if (VG_(strcmp)(name, STR_DataRaceErr) == 0)
516      skind = DataRaceErr;
517   else if (VG_(strcmp)(name, STR_MutexErr) == 0)
518      skind = MutexErr;
519   else if (VG_(strcmp)(name, STR_CondErr) == 0)
520      skind = CondErr;
521   else if (VG_(strcmp)(name, STR_CondDestrErr) == 0)
522      skind = CondDestrErr;
523   else if (VG_(strcmp)(name, STR_CondRaceErr) == 0)
524      skind = CondRaceErr;
525   else if (VG_(strcmp)(name, STR_CondWaitErr) == 0)
526      skind = CondWaitErr;
527   else if (VG_(strcmp)(name, STR_SemaphoreErr) == 0)
528      skind = SemaphoreErr;
529   else if (VG_(strcmp)(name, STR_BarrierErr) == 0)
530      skind = BarrierErr;
531   else if (VG_(strcmp)(name, STR_RwlockErr) == 0)
532      skind = RwlockErr;
533   else if (VG_(strcmp)(name, STR_HoldtimeErr) == 0)
534      skind = HoldtimeErr;
535   else if (VG_(strcmp)(name, STR_GenericErr) == 0)
536      skind = GenericErr;
537   else if (VG_(strcmp)(name, STR_InvalidThreadId) == 0)
538      skind = InvalidThreadId;
539   else if (VG_(strcmp)(name, STR_UnimpHgClReq) == 0)
540      skind = UnimpHgClReq;
541   else if (VG_(strcmp)(name, STR_UnimpDrdClReq) == 0)
542      skind = UnimpDrdClReq;
543   else
544      return False;
545
546   VG_(set_supp_kind)(supp, skind);
547   return True;
548}
549
550/**
551 * Read additional suppression information from the suppression file.
552 *
553 * None of the suppression patterns recognized by DRD has 'extra' lines
554 * of information in the suppression file, so just return True to indicate
555 * that reading the 'extra' lines succeeded.
556 */
557static
558Bool drd_read_extra_suppression_info(Int fd, HChar** bufpp,
559                                     SizeT* nBufp, Int* lineno, Supp* supp)
560{
561   return True;
562}
563
564/**
565 * Determine whether or not the types of the given error message and the
566 * given suppression match.
567 */
568static Bool drd_error_matches_suppression(Error* const e, Supp* const supp)
569{
570   return VG_(get_supp_kind)(supp) == VG_(get_error_kind)(e);
571}
572
573static const HChar* drd_get_error_name(Error* e)
574{
575   switch (VG_(get_error_kind)(e))
576   {
577   case DataRaceErr:  return VGAPPEND(STR_, DataRaceErr);
578   case MutexErr:     return VGAPPEND(STR_, MutexErr);
579   case CondErr:      return VGAPPEND(STR_, CondErr);
580   case CondDestrErr: return VGAPPEND(STR_, CondDestrErr);
581   case CondRaceErr:  return VGAPPEND(STR_, CondRaceErr);
582   case CondWaitErr:  return VGAPPEND(STR_, CondWaitErr);
583   case SemaphoreErr: return VGAPPEND(STR_, SemaphoreErr);
584   case BarrierErr:   return VGAPPEND(STR_, BarrierErr);
585   case RwlockErr:    return VGAPPEND(STR_, RwlockErr);
586   case HoldtimeErr:  return VGAPPEND(STR_, HoldtimeErr);
587   case GenericErr:   return VGAPPEND(STR_, GenericErr);
588   case InvalidThreadId: return VGAPPEND(STR_, InvalidThreadId);
589   case UnimpHgClReq:  return VGAPPEND(STR_, UnimpHgClReq);
590   case UnimpDrdClReq: return VGAPPEND(STR_, UnimpDrdClReq);
591   default:
592      tl_assert(0);
593   }
594   return 0;
595}
596
597/**
598 * Return extra suppression information.
599 *
600 * Invoked while printing a suppression pattern because the user
601 * specified --gen-suppressions=yes or all on the command line. DRD does not
602 * define any 'extra' suppression information.
603 */
604static
605Bool drd_get_extra_suppression_info(Error* e,
606                                    /*OUT*/HChar* buf, Int nBuf)
607{
608   return False;
609}
610
611static
612Bool drd_print_extra_suppression_use(Supp* su,
613                                     /*OUT*/HChar* buf, Int nBuf)
614{
615   return False;
616}
617
618static
619void  drd_update_extra_suppresion_use(Error* e, Supp* supp)
620{
621   return;
622}
623
624/** Tell the Valgrind core about DRD's error handlers. */
625void DRD_(register_error_handlers)(void)
626{
627   VG_(needs_tool_errors)(drd_compare_error_contexts,
628                          drd_tool_error_before_pp,
629                          drd_tool_error_pp,
630                          False,
631                          drd_tool_error_update_extra,
632                          drd_is_recognized_suppression,
633                          drd_read_extra_suppression_info,
634                          drd_error_matches_suppression,
635                          drd_get_error_name,
636                          drd_get_extra_suppression_info,
637                          drd_print_extra_suppression_use,
638                          drd_update_extra_suppresion_use);
639}
640