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added 080811.patch

git-svn-id: http://data-race-test.googlecode.com/svn/trunk@419 93a3164d-3a44-0410-8ae5-4baa038b0729
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1 parent feb4f2e commit 663070fdfb00f1a7cf059f3f9d71e43e73243642 konstantin.s.serebryany committed Aug 11, 2008
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599 patches/080811.patch
@@ -0,0 +1,599 @@
+Index: helgrind.h
+===================================================================
+--- helgrind.h (revision 8520)
++++ helgrind.h (working copy)
+@@ -73,6 +73,9 @@
+ VG_USERREQ__HG_MUTEX_IS_USED_AS_CONDVAR, /* void* */
+ VG_USERREQ__HG_IGNORE_READS_BEGIN, /* none */
+ VG_USERREQ__HG_IGNORE_READS_END, /* none */
++ VG_USERREQ__HG_IGNORE_WRITES_BEGIN, /* none */
++ VG_USERREQ__HG_IGNORE_WRITES_END, /* none */
++ VG_USERREQ__HG_PUBLISH_MEMORY_RANGE, /* void *, long */
+
+
+ /* The rest are for Helgrind's internal use. Not for end-user
+Index: hg_main.c
+===================================================================
+--- hg_main.c (revision 8520)
++++ hg_main.c (working copy)
+@@ -454,6 +454,7 @@
+ ExeContext* created_at;
+ Bool announced;
+ Bool ignore_reads;
++ Bool ignore_writes;
+ /* Index for generating references in error messages. */
+ Int errmsg_index;
+ }
+@@ -849,6 +850,11 @@
+ [n % SEGMENT_ID_CHUNK_SIZE];
+ }
+
++static inline Thread *SEG_thr(SegmentID n)
++{
++ return SEG_get(n)->thr;
++}
++
+ static void SEG_set_context(SegmentID n, ExeContext *context)
+ {
+ if (SCE_SVALS)
+@@ -1156,8 +1162,8 @@
+
+ //
+ // SVal:
+-// 10SSSSSSSSSSSSSSSSSSSSSSSSSSrrrrTrrrrrrrLLLLLLLLLLLLLLLLLLLLLLLL Read
+-// 11SSSSSSSSSSSSSSSSSSSSSSSSSSrrrrTrrrrrrrLLLLLLLLLLLLLLLLLLLLLLLL Mod
++// 10SSSSSSSSSSSSSSSSSSSSSSSSSSrrrrTrPrrrrrLLLLLLLLLLLLLLLLLLLLLLLL Read
++// 11SSSSSSSSSSSSSSSSSSSSSSSSSSrrrrTrPrrrrrLLLLLLLLLLLLLLLLLLLLLLLL Mod
+ // \_______ 26 _____________/ \________ 24 __________/
+ //
+ // 0100000000000000000000000000000000000000000000000000000000000001 Ignore
+@@ -1169,13 +1175,14 @@
+ // S - segment set bits
+ // L - lock set bits
+ // T - trace bit
++// P - published bit
+ //
+ // It's crucial that no valid SVal has a value of zero, since zero
+ // has a special meaning for the LineZ/LineF mechanism (see
+ // "lineZ->dict[0] == 0" in get_ZF_by_index).
+ //
+ //
+-// S:
++// S (segment set bits):
+ // 1SSSSSSSSSSSSSSSSSSSSSSS Just one segment.
+ // 0SSSSSSSSSSSSSSSSSSSSSSS A real segment set.
+ //
+@@ -1183,14 +1190,19 @@
+ // When set, the trace bit indicates that we want to trace each access
+ // to this memory (we output the trace only when the state changes).
+ //
++// P (published bit):
++// Set when a PUBLISH_MEMORY_RANGE client request has been called on the pointer
++// to this memory. See comments below (search for PUBLISH_MEMORY_RANGE).
+ //
++//
+ //
+
+ //------------- segment set, lock set --------------
+
+-#define N_SEG_SEG_BITS 26
+-#define N_LOCK_SET_BITS 24
+-#define TRACE_BIT_POSITION 31
++#define N_SEG_SEG_BITS (26)
++#define N_LOCK_SET_BITS (24)
++#define TRACE_BIT_POSITION (31)
++#define PUBLISHED_BIT_POSITION (33)
+
+ #define SHVAL_New ((SVal)(2<<8))
+ #define SHVAL_Invalid ((SVal)(0))
+@@ -1298,7 +1310,16 @@
+ return sv | ((SVal)trace_bit << TRACE_BIT_POSITION);
+ }
+
++static inline Bool get_SHVAL_PUBLISHED_BIT (SVal sv) {
++ return 1 == ((sv >> PUBLISHED_BIT_POSITION) & 1);
++}
+
++static inline SVal set_SHVAL_PUBLISHED_BIT (SVal sv, Bool published_bit) {
++ return sv | ((SVal)published_bit << PUBLISHED_BIT_POSITION);
++}
++
++
++
+ static inline SegmentSet get_SHVAL_SS (SVal sv) {
+ SegmentSet ss;
+ Int shift = 62 - N_SEG_SEG_BITS;
+@@ -1590,6 +1611,13 @@
+ VG_(sprintf)(buf, "%s; #LS=%d; #SS=%d; ",
+ name, n_locks, (Int)n_segments);
+
++ if (get_SHVAL_TRACE_BIT(sv)) {
++ VG_(sprintf)(buf + VG_(strlen)(buf), "TR; ");
++ }
++ if (get_SHVAL_PUBLISHED_BIT(sv)) {
++ VG_(sprintf)(buf + VG_(strlen)(buf), "PB; ");
++ }
++
+ for (i = 0; i < n_segments; i++) {
+ SegmentID S;
+ if (VG_(strlen(buf)) > nBuf - 20) {
+@@ -2261,9 +2289,13 @@
+ if (HG_(lookupFM)( map_expected_errors,
+ NULL/*keyP*/, (Word*)&expected_error, (Word)ptr)) {
+ tl_assert(expected_error->addr == ptr);
+- VG_(printf)("Found expected race: %s:%d %p\t%s\n",
++ if (!expected_error->is_benign) {
++ // Print expected errors inside unit tests,
++ // but don't print benign races.
++ VG_(printf)("Found expected race: %s:%d %p\t%s\n",
+ expected_error->file, expected_error->line,
+ ptr, expected_error->descr);
++ }
+ return expected_error;
+ }
+ return NULL;
+@@ -3380,6 +3412,11 @@
+ static void record_error_Misc ( Thread*, HChar* );
+ static void announce_one_thread ( Thread* thr ); /* fwds */
+
++static void evhH__do_cv_signal(Thread *thr, Word cond);
++static Bool evhH__do_cv_wait(Thread *thr, Word cond, Bool must_match_signal);
++
++
++
+ // KCC: If you agree with the new scheme of handling BHL,
+ // KCC: add_BHL/del_BHL could be deleted completely.
+ // KCC: Now these functions are commented out to avoid compiler warnings.
+@@ -3547,8 +3584,102 @@
+ }
+ }
+
++//-------------------------------------------
++// PUBLISH_MEMORY_RANGE client request.
+ //
++// We create a happens-before arc between a call to PUBLISH_MEMORY_RANGE(ptr, size)
++// and an memory access in range [ptr, ptr+size).
+ //
++// Example:
++//
++// Publisher: Accessors:
++//
++// 1. MU1.Lock()
++// 2. Create GLOB.
++// 3. ANNOTATE_PUBLISH_MEMORY_RANGE(GLOB, size) -\ .
++// 4. MU1.Unlock() \ .
++// \ a. MU1.Lock()
++// \ b. Get GLOB
++// \ c. MU1.Lock()
++// \---> d. Access GLOB
++//
++// A happens-before arc is created between ANNOTATE_PUBLISH_MEMORY_RANGE and
++// reads from GLOB.
++//
++//
++//
++
++
++static WordFM* published_memory_map = NULL; /* Addr -> SizeT */
++SegmentID release_segment = 0;
++
++// 'from' part of the happens-before arc.
++static void published_memory_range_release (Thread *thr, Addr a, SizeT len)
++{
++ if (0) VG_(printf)("PUBLISH_MEMORY_RANGE: release: T%d/S%d %p %lu\n",
++ thr->errmsg_index, thr->csegid, a, len);
++
++ if (published_memory_map == NULL) {
++ published_memory_map = HG_(newFM)( hg_zalloc, hg_free, NULL);
++ }
++
++ // Put 'len' into the map.
++ // FM has the equivalent of upper_bound() (initIterAtFM) but does not have
++ // and equivalent for lower_bound(). So, we store a+len in this map.
++ HG_(addToFM)(published_memory_map, a + len, (UWord)len);
++ // Create the 'from' part of the HB-arc.
++ evhH__do_cv_signal(thr, a);
++}
++
++// 'to' part of the happens-before arc.
++// Return true if a new segment has been created.
++static Bool published_memory_range_acquire (Thread *thr, Addr a)
++{
++ tl_assert(published_memory_map); // The map must be created already.
++ Addr addr = 0;
++ SizeT len = 0;
++ // Check if we have this address in map.
++ HG_(initIterAtFM)(published_memory_map, a);
++ if (HG_(nextIterFM)(published_memory_map, (Word*)&addr, (Word*)&len)) {
++ addr -= len; // We stored a+len in the map.
++ if (a >= addr && a < addr + len) {
++ // 'a' is indeed within [addr, addr+len).
++ if (0) VG_(printf)("PUBLISH_MEMORY_RANGE: acquire: T%d/S%d %p %lu\n",
++ thr->errmsg_index, thr->csegid, a, len);
++ // This will create a new segment only if the current segment
++ // does not happen-after the corresponding segment from
++ // published_memory_range_release().
++ return evhH__do_cv_wait(thr, addr, False);
++ }
++ } else {
++ tl_assert(0); // Must not happen.
++ }
++ return False;
++}
++
++// forget about published memory, i.e. remove all pointers within
++// [first, last) from published_memory_map.
++static void published_memory_range_forget (Addr first, Addr last)
++{
++ Addr addr = 0;
++ SizeT len = 0;
++ Bool do_repeat = False;
++ if (!published_memory_map) return;
++ do {
++ do_repeat = False;
++ HG_(initIterAtFM)(published_memory_map, first);
++ while (HG_(nextIterFM)(published_memory_map, (Word*)&addr, (Word*)&len)
++ && (addr-len) >= first && (addr - len) < last) {
++ HG_(delFromFM)(published_memory_map, NULL, NULL, addr);
++ do_repeat = True;
++ first = addr + 1;
++ break;
++ }
++ } while (do_repeat);
++}
++
++//
++//
+ // See http://code.google.com/p/data-race-test/wiki/MSMProp1
+ // for description.
+ //
+@@ -3863,6 +3994,10 @@
+ sv_new = sv_old;
+ goto done;
+ }
++ if (UNLIKELY(is_w && thr->ignore_writes)) {
++ sv_new = sv_old;
++ goto done;
++ }
+
+
+ if (UNLIKELY(is_SHVAL_Ignore(sv_old))) {
+@@ -3904,6 +4039,14 @@
+ if (UNLIKELY(get_SHVAL_TRACE_BIT(sv_old))) {
+ trace_level = 2;
+ }
++
++ if (UNLIKELY(get_SHVAL_PUBLISHED_BIT(sv_old))) {
++ if (published_memory_range_acquire(thr, a)) {
++ // we have created a new segment.
++ tl_assert(currS != thr->csegid);
++ currS = thr->csegid;
++ }
++ }
+
+ was_m = is_SHVAL_M(sv_old);
+
+@@ -3930,7 +4073,9 @@
+ // generate new SVal
+ sv_new = mk_SHVAL_RM(now_m, newSS, newLS);
+ sv_new = set_SHVAL_TRACE_BIT(sv_new, get_SHVAL_TRACE_BIT(sv_old));
++ sv_new = set_SHVAL_PUBLISHED_BIT(sv_new, get_SHVAL_PUBLISHED_BIT(sv_old));
+
++
+ is_race = now_m && !SS_is_singleton(newSS)
+ && HG_(isEmptyWS)(univ_lsets, newLS);
+
+@@ -3969,6 +4114,7 @@
+ // Stop tracing and start ignoring this memory location.
+ VG_(message)(Vg_UserMsg, "Race on %p is found again after %u accesses",
+ a, get_trace_info(a)->n_accesses);
++ VG_(message)(Vg_UserMsg, ""); // Empty line.
+ sv_new = SHVAL_Ignore;
+ is_race = False;
+ }
+@@ -3989,6 +4135,8 @@
+ // turn tracing on.
+ sv_new = mk_SHVAL_RM(is_w, SS_mk_singleton(currS), currLS);
+ sv_new = set_SHVAL_TRACE_BIT(sv_new, True);
++ sv_new = set_SHVAL_PUBLISHED_BIT(sv_new,
++ get_SHVAL_PUBLISHED_BIT(sv_old));
+ msm_do_trace(thr, a, sv_old, sv_new, is_w, 2);
+ } else {
+ // put this in Ignore state
+@@ -5787,6 +5935,7 @@
+
+ // turn off memory trace
+ mem_trace_off(firstA, lastA);
++ published_memory_range_forget(firstA, lastA);
+
+ /* --- Step 2 --- */
+
+@@ -5907,7 +6056,32 @@
+ if (0) all__sanity_check("Make NoAccess");
+ }
+
++// Set the published bit for all bytes in range [aIN, aIN + size).
++// Return true if all the memory either belongs to thread 'thr' or uninitialized.
++static Bool shadow_mem_set_published( Thread* thr, Addr aIN, SizeT len )
++{
++ Bool res = True;
++ SizeT i;
++ for (i = 0; i < len; i++) {
++ Addr a = aIN + i;
++ SVal sv_old = shadow_mem_get8(a);
++ if (is_SHVAL_RM(sv_old)) {
++ SegmentSet ss = get_SHVAL_SS(sv_old);
++ if (!SS_is_singleton(ss) || SEG_thr(SS_get_singleton(ss)) != thr) {
++ // This memory does not belong to the current thread.
++ res = False;
++ }
++ SVal sv_new = set_SHVAL_PUBLISHED_BIT(sv_old, True);
++ shadow_mem_set8(thr, a, sv_new);
++ } else {
++ // User requested PUBLISH_MEMORY_RANGE on an uninitialized memory.
++ // Might be ok though, we are not memcheck after all.
++ }
++ }
++ return res;
++}
+
++
+ /*----------------------------------------------------------------*/
+ /*--- Event handlers (evh__* functions) ---*/
+ /*--- plus helpers (evhH__* functions) ---*/
+@@ -5916,8 +6090,6 @@
+ /*--------- Event handler helpers (evhH__* functions) ---------*/
+
+
+-static void evhH__do_cv_signal(Thread *thr, Word cond);
+-static Bool evhH__do_cv_wait(Thread *thr, Word cond, Bool must_match_signal);
+
+ /* Create a new segment for 'thr', making it depend (.prev) on its
+ existing segment, bind together the SegmentID and Segment, and
+@@ -6374,6 +6546,39 @@
+ }
+
+ static
++void evh__publish_memory_range ( Addr a, SizeT len ) {
++ if (SHOW_EVENTS >= 2)
++ VG_(printf)("evh__publish_memory_range(%p, %lu)\n", (void*)a, len );
++
++ Thread *thr = get_current_Thread();
++ // Set the PUBLISHED bit in all svals in range [a, a+len)
++ if (!shadow_mem_set_published(thr, a, len )) {
++ // This memory has been accessed by another thread before this one.
++ // This is likely a misuse of PUBLISH_MEMORY_RANGE client request.
++ // And also this is likely a race.
++ HChar buff[120];
++ VG_(sprintf)(buff,
++ "Possible data race or misuse of PUBLISH_MEMORY_RANGE(%p, %lu).",
++ a, len);
++ record_error_Misc(thr, buff);
++ }
++
++ // Create a 'from' part of the happens-before arc.
++ published_memory_range_release( get_current_Thread(), a, len);
++
++
++ // TODO(kcc): need to compress svals back.
++ // shmem__flush_and_invalidate_scache() helps, but it is expensive.
++ // If PUBLISH_MEMORY_RANGE becomes hot, may need to do somthing different.
++ shmem__flush_and_invalidate_scache();
++
++
++ if (len >= SCE_BIGRANGE_T && (clo_sanity_flags & SCE_BIGRANGE))
++ all__sanity_check("evh__publish_memory_range-post");
++}
++
++
++static
+ void evh__pre_thread_ll_create ( ThreadId parent, ThreadId child )
+ {
+ if (SHOW_EVENTS >= 1)
+@@ -6855,7 +7060,7 @@
+ signallings/broadcasts.
+ */
+
+-/* pthread_mutex_cond* -> Segment* */
++/* pthread_mutex_cond* -> SegmentID */
+ static WordFM* map_cond_to_Segment = NULL;
+
+ static void map_cond_to_Segment_INIT ( void ) {
+@@ -6872,7 +7077,8 @@
+ Segment* new_seg;
+ SegmentID fake_segid;
+ Segment* fake_seg;
+- Segment *signalling_seg = NULL;
++ SegmentID signalling_segid = 0;
++ Word word_temp = 0;
+
+ map_cond_to_Segment_INIT();
+ if (clo_happens_before < 2) return;
+@@ -6908,21 +7114,21 @@
+ fake_seg->other = new_seg->prev;
+
+
+- HG_(lookupFM)( map_cond_to_Segment,
+- NULL, (Word*)&signalling_seg,
+- (Word)cond );
+- if (signalling_seg != 0) {
+- fake_seg->prev = signalling_seg;
+-
++ if (HG_(lookupFM)(map_cond_to_Segment, NULL, (Word*)&word_temp, (Word)cond)) {
++ signalling_segid = (SegmentID)(word_temp); // I hate type-unsefe stuff!
++ tl_assert(signalling_segid);
++ fake_seg->prev = SEG_get(signalling_segid);
+ }
+- fake_seg->vts = tickL_and_joinR_VTS(fake_thread,
+- fake_seg->prev->vts,
+- fake_seg->other->vts);
+- HG_(addToFM)( map_cond_to_Segment, (Word)cond, (Word)(fake_seg) );
++ fake_seg->vts = tickL_and_joinR_VTS(fake_thread,
++ fake_seg->prev->vts,
++ fake_seg->other->vts);
++ HG_(addToFM)( map_cond_to_Segment, (Word)cond, (Word)(fake_segid) );
++ //VG_(printf)("HB map: put %p %d\n", cond, fake_segid);
++
+ // FIXME. test67 gives false negative.
+ // But this looks more like a feature than a bug.
+ //
+- // FIXME. At this point the old signalling_seg is not needed any more
++ // FIXME. At this point the old signalling_segid is not needed any more
+ // if we use only VTS. If we stop using HB graph, we can have only
+ // one fake segment for a CV.
+
+@@ -6931,56 +7137,74 @@
+
+ Bool evhH__do_cv_wait(Thread *thr, Word cond, Bool must_match_signal)
+ {
+- SegmentID new_segid;
+- Segment* new_seg;
+- Segment* signalling_seg;
+- Bool found;
++ SegmentID new_segid = 0;
++ Segment* new_seg = NULL;
++ Word word_temp = 0;
++ SegmentID signalling_segid = 0;
+ map_cond_to_Segment_INIT();
+- if (clo_happens_before >= 2) {
+- /* create a new segment ... */
+- new_segid = 0; /* bogus */
+- new_seg = NULL;
+- evhH__start_new_segment_for_thread( &new_segid, &new_seg, thr );
+- tl_assert( SEG_id_is_sane(new_segid) );
+- tl_assert( is_sane_Segment(new_seg) );
+- tl_assert( new_seg->thr == thr );
+- tl_assert( is_sane_Segment(new_seg->prev) );
+- tl_assert( new_seg->other == NULL);
+
+- /* and find out which thread signalled us; then add a dependency
+- edge back to it. */
+- signalling_seg = NULL;
+- found = HG_(lookupFM)( map_cond_to_Segment,
+- NULL, (Word*)&signalling_seg,
+- (Word)cond );
+- if (found) {
+- tl_assert(is_sane_Segment(signalling_seg));
+- tl_assert(new_seg->prev);
+- tl_assert(new_seg->prev->vts);
+- new_seg->other = signalling_seg;
+- new_seg->other_hint = 's';
+- tl_assert(new_seg->other->vts);
+- new_seg->vts = tickL_and_joinR_VTS(
+- new_seg->thr,
+- new_seg->prev->vts,
+- new_seg->other->vts );
+- return True;
+- } else {
+- if (must_match_signal) {
+- /* Hmm. How can a wait on 'cond' succeed if nobody signalled
+- it? If this happened it would surely be a bug in the
+- threads library. Or one of those fabled "spurious
+- wakeups". */
+- record_error_Misc( thr, "Bug in libpthread: pthread_cond_wait "
+- "succeeded on"
+- " without prior pthread_cond_post");
+- }
+- tl_assert(new_seg->prev->vts);
+- new_seg->vts = tick_VTS( new_seg->thr, new_seg->prev->vts );
+- return False;
+- }
++ if (clo_happens_before < 2) return False;
++
++ if (HG_(lookupFM)( map_cond_to_Segment, NULL, (Word*)&word_temp, (Word)cond)) {
++ signalling_segid = (SegmentID)word_temp;
++ tl_assert(signalling_segid);
+ }
+- return False;
++
++ if (signalling_segid && happens_before(signalling_segid, thr->csegid)) {
++ // The signalling segment already happens-after the current one.
++ // Thread1: Thread2:
++ // 1. SIGNAL --------> a. WAIT
++ // b. WAIT
++ // A HB-arc has been created for a previous WAIT in this thread.
++ // No need to create another segment.
++ return False;
++ }
++
++ if (!signalling_segid && !must_match_signal) {
++ // No one signalled us before, and we don't want to report this
++ // as an error (e.g. SIGNAL and WAIT are annotations, not a real condvar)
++ return False;
++ }
++
++
++ /* create a new segment ... */
++ evhH__start_new_segment_for_thread( &new_segid, &new_seg, thr );
++ tl_assert( SEG_id_is_sane(new_segid) );
++ tl_assert( is_sane_Segment(new_seg) );
++ tl_assert( new_seg->thr == thr );
++ tl_assert( is_sane_Segment(new_seg->prev) );
++ tl_assert( new_seg->other == NULL);
++
++ /* and find out which thread signalled us; then add a dependency
++ edge back to it. */
++ if (signalling_segid) {
++ // VG_(printf)("HB map: get %p %d\n", cond, signalling_segid);
++ tl_assert(SEG_id_is_sane(signalling_segid));
++ tl_assert(new_seg->prev);
++ tl_assert(new_seg->prev->vts);
++ new_seg->other = SEG_get(signalling_segid);
++ new_seg->other_hint = 's';
++ tl_assert(new_seg->other->vts);
++ new_seg->vts = tickL_and_joinR_VTS(
++ new_seg->thr,
++ new_seg->prev->vts,
++ new_seg->other->vts );
++ tl_assert(SEG_id_is_sane(signalling_segid));
++ tl_assert(SEG_id_is_sane(new_segid));
++ return True;
++ } else {
++ tl_assert(must_match_signal);
++ /* Hmm. How can a wait on 'cond' succeed if nobody signalled
++ it? If this happened it would surely be a bug in the
++ threads library. Or one of those fabled "spurious
++ wakeups". */
++ record_error_Misc( thr, "Bug in libpthread: pthread_cond_wait "
++ "succeeded on"
++ " without prior pthread_cond_post");
++ tl_assert(new_seg->prev->vts);
++ new_seg->vts = tick_VTS( new_seg->thr, new_seg->prev->vts );
++ return False;
++ }
+ }
+
+
+
+
+@@ -8715,6 +8940,30 @@
+ break;
+ }
+
++ // These two requests are similar to IGNORE_READS_{BEGIN,END}
++ // but will let you ignore writes.
++ case VG_USERREQ__HG_IGNORE_WRITES_BEGIN: {
++ Thread *thr = map_threads_maybe_lookup( tid );
++ tl_assert(thr); /* cannot fail */
++ tl_assert(!thr->ignore_writes);
++ thr->ignore_writes = True;
++ break;
++ }
++ case VG_USERREQ__HG_IGNORE_WRITES_END: {
++ Thread *thr = map_threads_maybe_lookup( tid );
++ tl_assert(thr); /* cannot fail */
++ tl_assert(thr->ignore_writes);
++ thr->ignore_writes = False;
++ break;
++ }
++
++ case VG_USERREQ__HG_PUBLISH_MEMORY_RANGE: {
++ Addr ptr = (Addr) args[1];
++ SizeT size = (SizeT) args[2];
++ evh__publish_memory_range(ptr, size);
++ break;
++ }
++
+ default:
+ /* Unhandled Helgrind client request! */
+ tl_assert2(0, "unhandled Helgrind client request!");

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