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_allocator_interface.h"
  12 #include "sanitizer_common/sanitizer_common.h"
  13 #include "sanitizer_common/sanitizer_placement_new.h"
  14 #include "tsan_mman.h"
  15 #include "tsan_rtl.h"
  16 #include "tsan_report.h"
  17 #include "tsan_flags.h"
  18
  19 // May be overriden by front-end.
  20 extern "C" void WEAK __sanitizer_malloc_hook(void *ptr, uptr size) {
  21   (void)ptr;
  22   (void)size;
  23 }
  24
  25 extern "C" void WEAK __sanitizer_free_hook(void *ptr) {
  26   (void)ptr;
  27 }
  28
  29 namespace __tsan {
  30
  31 struct MapUnmapCallback {
  32   void OnMap(uptr p, uptr size) const { }
  33   void OnUnmap(uptr p, uptr size) const {
  34     // We are about to unmap a chunk of user memory.
  35     // Mark the corresponding shadow memory as not needed.
  36     DontNeedShadowFor(p, size);
  37   }
  38 };
  39
  40 static char allocator_placeholder[sizeof(Allocator)] ALIGNED(64);
  41 Allocator *allocator() {
  42   return reinterpret_cast<Allocator*>(&allocator_placeholder);
  43 }
  44
  45 void InitializeAllocator() {
  46   allocator()->Init();
  47 }
  48
  49 void AllocatorThreadStart(ThreadState *thr) {
  50   allocator()->InitCache(&thr->alloc_cache);
  51   internal_allocator()->InitCache(&thr->internal_alloc_cache);
  52 }
  53
  54 void AllocatorThreadFinish(ThreadState *thr) {
  55   allocator()->DestroyCache(&thr->alloc_cache);
  56   internal_allocator()->DestroyCache(&thr->internal_alloc_cache);
  57 }
  58
  59 void AllocatorPrintStats() {
  60   allocator()->PrintStats();
  61 }
  62
  63 static void SignalUnsafeCall(ThreadState *thr, uptr pc) {
  64   if (atomic_load(&thr->in_signal_handler, memory_order_relaxed) == 0 ||
  65       !flags()->report_signal_unsafe)
  66     return;
  67   VarSizeStackTrace stack;
  68   ObtainCurrentStack(thr, pc, &stack);
  69   ThreadRegistryLock l(ctx->thread_registry);
  70   ScopedReport rep(ReportTypeSignalUnsafe);
  71   if (!IsFiredSuppression(ctx, rep, stack)) {
  72     rep.AddStack(stack, true);
  73     OutputReport(thr, rep);
  74   }
  75 }
  76
  77 void *user_alloc(ThreadState *thr, uptr pc, uptr sz, uptr align, bool signal) {
  78   if ((sz >= (1ull << 40)) || (align >= (1ull << 40)))
  79     return AllocatorReturnNull();
  80   void *p = allocator()->Allocate(&thr->alloc_cache, sz, align);
  81   if (p == 0)
  82     return 0;
  83   if (ctx && ctx->initialized)
  84     OnUserAlloc(thr, pc, (uptr)p, sz, true);
  85   if (signal)
  86     SignalUnsafeCall(thr, pc);
  87   return p;
  88 }
  89
  90 void user_free(ThreadState *thr, uptr pc, void *p, bool signal) {
  91   if (ctx && ctx->initialized)
  92     OnUserFree(thr, pc, (uptr)p, true);
  93   allocator()->Deallocate(&thr->alloc_cache, p);
  94   if (signal)
  95     SignalUnsafeCall(thr, pc);
  96 }
  97
  98 void OnUserAlloc(ThreadState *thr, uptr pc, uptr p, uptr sz, bool write) {
  99   DPrintf("#%d: alloc(%zu) = %p\n", thr->tid, sz, p);
 100   ctx->metamap.AllocBlock(thr, pc, p, sz);
 101   if (write && thr->ignore_reads_and_writes == 0)
 102     MemoryRangeImitateWrite(thr, pc, (uptr)p, sz);
 103   else
 104     MemoryResetRange(thr, pc, (uptr)p, sz);
 105 }
 106
 107 void OnUserFree(ThreadState *thr, uptr pc, uptr p, bool write) {
 108   CHECK_NE(p, (void*)0);
 109   uptr sz = ctx->metamap.FreeBlock(thr, pc, p);
 110   DPrintf("#%d: free(%p, %zu)\n", thr->tid, p, sz);
 111   if (write && thr->ignore_reads_and_writes == 0)
 112     MemoryRangeFreed(thr, pc, (uptr)p, sz);
 113 }
 114
 115 void *user_realloc(ThreadState *thr, uptr pc, void *p, uptr sz) {
 116   void *p2 = 0;
 117   // FIXME: Handle "shrinking" more efficiently,
 118   // it seems that some software actually does this.
 119   if (sz) {
 120     p2 = user_alloc(thr, pc, sz);
 121     if (p2 == 0)
 122       return 0;
 123     if (p) {
 124       uptr oldsz = user_alloc_usable_size(p);
 125       internal_memcpy(p2, p, min(oldsz, sz));
 126     }
 127   }
 128   if (p)
 129     user_free(thr, pc, p);
 130   return p2;
 131 }
 132
 133 uptr user_alloc_usable_size(const void *p) {
 134   if (p == 0)
 135     return 0;
 136   MBlock *b = ctx->metamap.GetBlock((uptr)p);
 137   return b ? b->siz : 0;
 138 }
 139
 140 void invoke_malloc_hook(void *ptr, uptr size) {
 141   ThreadState *thr = cur_thread();
 142   if (ctx == 0 || !ctx->initialized || thr->ignore_interceptors)
 143     return;
 144   __sanitizer_malloc_hook(ptr, size);
 145 }
 146
 147 void invoke_free_hook(void *ptr) {
 148   ThreadState *thr = cur_thread();
 149   if (ctx == 0 || !ctx->initialized || thr->ignore_interceptors)
 150     return;
 151   __sanitizer_free_hook(ptr);
 152 }
 153
 154 void *internal_alloc(MBlockType typ, uptr sz) {
 155   ThreadState *thr = cur_thread();
 156   if (thr->nomalloc) {
 157     thr->nomalloc = 0;  // CHECK calls internal_malloc().
 158     CHECK(0);
 159   }
 160   return InternalAlloc(sz, &thr->internal_alloc_cache);
 161 }
 162
 163 void internal_free(void *p) {
 164   ThreadState *thr = cur_thread();
 165   if (thr->nomalloc) {
 166     thr->nomalloc = 0;  // CHECK calls internal_malloc().
 167     CHECK(0);
 168   }
 169   InternalFree(p, &thr->internal_alloc_cache);
 170 }
 171
 172 }  // namespace __tsan
 173
 174 using namespace __tsan;
 175
 176 extern "C" {
 177 uptr __sanitizer_get_current_allocated_bytes() {
 178   uptr stats[AllocatorStatCount];
 179   allocator()->GetStats(stats);
 180   return stats[AllocatorStatAllocated];
 181 }
 182
 183 uptr __sanitizer_get_heap_size() {
 184   uptr stats[AllocatorStatCount];
 185   allocator()->GetStats(stats);
 186   return stats[AllocatorStatMapped];
 187 }
 188
 189 uptr __sanitizer_get_free_bytes() {
 190   return 1;
 191 }
 192
 193 uptr __sanitizer_get_unmapped_bytes() {
 194   return 1;
 195 }
 196
 197 uptr __sanitizer_get_estimated_allocated_size(uptr size) {
 198   return size;
 199 }
 200
 201 int __sanitizer_get_ownership(const void *p) {
 202   return allocator()->GetBlockBegin(p) != 0;
 203 }
 204
 205 uptr __sanitizer_get_allocated_size(const void *p) {
 206   return user_alloc_usable_size(p);
 207 }
 208
 209 void __tsan_on_thread_idle() {
 210   ThreadState *thr = cur_thread();
 211   allocator()->SwallowCache(&thr->alloc_cache);
 212   internal_allocator()->SwallowCache(&thr->internal_alloc_cache);
 213   ctx->metamap.OnThreadIdle(thr);
 214 }
 215 }  // extern "C"