libsanitizer/tsan/tsan_mman.cc

   1 //===-- tsan_mman.cc ------------------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 //===----------------------------------------------------------------------===//
  11 #include "sanitizer_common/sanitizer_common.h"
  12 #include "sanitizer_common/sanitizer_placement_new.h"
  13 #include "tsan_mman.h"
  14 #include "tsan_rtl.h"
  15 #include "tsan_report.h"
  16 #include "tsan_flags.h"
  17
  18 // May be overriden by front-end.
  19 extern "C" void WEAK __tsan_malloc_hook(void *ptr, uptr size) {
  20   (void)ptr;
  21   (void)size;
  22 }
  23
  24 extern "C" void WEAK __tsan_free_hook(void *ptr) {
  25   (void)ptr;
  26 }
  27
  28 namespace __tsan {
  29
  30 static char allocator_placeholder[sizeof(Allocator)] ALIGNED(64);
  31 Allocator *allocator() {
  32   return reinterpret_cast<Allocator*>(&allocator_placeholder);
  33 }
  34
  35 void InitializeAllocator() {
  36   allocator()->Init();
  37 }
  38
  39 void AlloctorThreadFinish(ThreadState *thr) {
  40   allocator()->SwallowCache(&thr->alloc_cache);
  41 }
  42
  43 static void SignalUnsafeCall(ThreadState *thr, uptr pc) {
  44   if (!thr->in_signal_handler || !flags()->report_signal_unsafe)
  45     return;
  46   Context *ctx = CTX();
  47   StackTrace stack;
  48   stack.ObtainCurrent(thr, pc);
  49   ScopedReport rep(ReportTypeSignalUnsafe);
  50   if (!IsFiredSuppression(ctx, rep, stack)) {
  51     rep.AddStack(&stack);
  52     OutputReport(ctx, rep, rep.GetReport()->stacks[0]);
  53   }
  54 }
  55
  56 void *user_alloc(ThreadState *thr, uptr pc, uptr sz, uptr align) {
  57   CHECK_GT(thr->in_rtl, 0);
  58   void *p = allocator()->Allocate(&thr->alloc_cache, sz, align);
  59   if (p == 0)
  60     return 0;
  61   MBlock *b = new(allocator()->GetMetaData(p)) MBlock;
  62   b->size = sz;
  63   b->head = 0;
  64   b->alloc_tid = thr->unique_id;
  65   b->alloc_stack_id = CurrentStackId(thr, pc);
  66   if (CTX() && CTX()->initialized) {
  67     MemoryRangeImitateWrite(thr, pc, (uptr)p, sz);
  68   }
  69   DPrintf("#%d: alloc(%zu) = %p\n", thr->tid, sz, p);
  70   SignalUnsafeCall(thr, pc);
  71   return p;
  72 }
  73
  74 void user_free(ThreadState *thr, uptr pc, void *p) {
  75   CHECK_GT(thr->in_rtl, 0);
  76   CHECK_NE(p, (void*)0);
  77   DPrintf("#%d: free(%p)\n", thr->tid, p);
  78   MBlock *b = (MBlock*)allocator()->GetMetaData(p);
  79   if (b->head)   {
  80     Lock l(&b->mtx);
  81     for (SyncVar *s = b->head; s;) {
  82       SyncVar *res = s;
  83       s = s->next;
  84       StatInc(thr, StatSyncDestroyed);
  85       res->mtx.Lock();
  86       res->mtx.Unlock();
  87       DestroyAndFree(res);
  88     }
  89     b->head = 0;
  90   }
  91   if (CTX() && CTX()->initialized && thr->in_rtl == 1) {
  92     MemoryRangeFreed(thr, pc, (uptr)p, b->size);
  93   }
  94   b->~MBlock();
  95   allocator()->Deallocate(&thr->alloc_cache, p);
  96   SignalUnsafeCall(thr, pc);
  97 }
  98
  99 void *user_realloc(ThreadState *thr, uptr pc, void *p, uptr sz) {
 100   CHECK_GT(thr->in_rtl, 0);
 101   void *p2 = 0;
 102   // FIXME: Handle "shrinking" more efficiently,
 103   // it seems that some software actually does this.
 104   if (sz) {
 105     p2 = user_alloc(thr, pc, sz);
 106     if (p2 == 0)
 107       return 0;
 108     if (p) {
 109       MBlock *b = user_mblock(thr, p);
 110       internal_memcpy(p2, p, min(b->size, sz));
 111     }
 112   }
 113   if (p) {
 114     user_free(thr, pc, p);
 115   }
 116   return p2;
 117 }
 118
 119 MBlock *user_mblock(ThreadState *thr, void *p) {
 120   CHECK_NE(p, (void*)0);
 121   Allocator *a = allocator();
 122   void *b = a->GetBlockBegin(p);
 123   CHECK_NE(b, 0);
 124   return (MBlock*)a->GetMetaData(b);
 125 }
 126
 127 void invoke_malloc_hook(void *ptr, uptr size) {
 128   Context *ctx = CTX();
 129   ThreadState *thr = cur_thread();
 130   if (ctx == 0 || !ctx->initialized || thr->in_rtl)
 131     return;
 132   __tsan_malloc_hook(ptr, size);
 133 }
 134
 135 void invoke_free_hook(void *ptr) {
 136   Context *ctx = CTX();
 137   ThreadState *thr = cur_thread();
 138   if (ctx == 0 || !ctx->initialized || thr->in_rtl)
 139     return;
 140   __tsan_free_hook(ptr);
 141 }
 142
 143 void *internal_alloc(MBlockType typ, uptr sz) {
 144   ThreadState *thr = cur_thread();
 145   CHECK_GT(thr->in_rtl, 0);
 146   if (thr->nomalloc) {
 147     thr->nomalloc = 0;  // CHECK calls internal_malloc().
 148     CHECK(0);
 149   }
 150   return InternalAlloc(sz);
 151 }
 152
 153 void internal_free(void *p) {
 154   ThreadState *thr = cur_thread();
 155   CHECK_GT(thr->in_rtl, 0);
 156   if (thr->nomalloc) {
 157     thr->nomalloc = 0;  // CHECK calls internal_malloc().
 158     CHECK(0);
 159   }
 160   InternalFree(p);
 161 }
 162
 163 }  // namespace __tsan