[Sanitizers] Make common allocator agnostic to failure handling modes.

[alekseyshl]

Summary

Make common allocator agnostic to failure handling modes and move the
decision up to the particular sanitizer's allocator, where the context
is available (call stack, parameters, return nullptr/crash mode etc.)

It simplifies the common allocator and allows the particular sanitizer's
allocator to generate more specific and detailed error reports (which
will be implemented later).

The behavior is largely the same, except one case, the violation of the
common allocator's check for "size + alignment" overflow is now reportied
as OOM instead of "bad request". It feels like a worthy tradeoff and
"size + alignment" is huge in this case anyway (thus, can be interpreted
as not enough memory to satisfy the request). There's also a Report()
statement added there.

compiler-rt/trunk/lib/asan/asan_allocator.cc

struct Allocator {
   }
 
   // -------------------- Allocation/Deallocation routines ---------------
   void *Allocate(uptr size, uptr alignment, BufferedStackTrace *stack,
                  AllocType alloc_type, bool can_fill) {
     if (UNLIKELY(!asan_inited))
       AsanInitFromRtl();
     if (RssLimitExceeded())
-      return AsanAllocator::FailureHandler::OnOOM();
+      return ReturnNullOrDieOnFailure::OnOOM();
     Flags &fl = *flags();
     CHECK(stack);
     const uptr min_alignment = SHADOW_GRANULARITY;
     const uptr user_requested_alignment_log =
         ComputeUserRequestedAlignmentLog(alignment);
     if (alignment < min_alignment)
       alignment = min_alignment;
     if (size == 0) {
void *Allocate(uptr size, uptr alignment, BufferedStackTrace *stack,
     if (!PrimaryAllocator::CanAllocate(needed_size, alignment)) {
       needed_size += rz_size;
       using_primary_allocator = false;
     }
     CHECK(IsAligned(needed_size, min_alignment));
     if (size > kMaxAllowedMallocSize || needed_size > kMaxAllowedMallocSize) {
       Report("WARNING: AddressSanitizer failed to allocate 0x%zx bytes\n",
              (void*)size);
-      return AsanAllocator::FailureHandler::OnBadRequest();
+      return ReturnNullOrDieOnFailure::OnBadRequest();
     }
 
     AsanThread *t = GetCurrentThread();
     void *allocated;
     if (t) {
       AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
       allocated = allocator.Allocate(cache, needed_size, 8);
     } else {
       SpinMutexLock l(&fallback_mutex);
       AllocatorCache *cache = &fallback_allocator_cache;
       allocated = allocator.Allocate(cache, needed_size, 8);
     }
-    if (!allocated)
-      return nullptr;
+    if (UNLIKELY(!allocated))
+      return ReturnNullOrDieOnFailure::OnOOM();
 
     if (*(u8 *)MEM_TO_SHADOW((uptr)allocated) == 0 && CanPoisonMemory()) {
       // Heap poisoning is enabled, but the allocator provides an unpoisoned
       // chunk. This is possible if CanPoisonMemory() was false for some
       // time, for example, due to flags()->start_disabled.
       // Anyway, poison the block before using it for anything else.
       uptr allocated_size = allocator.GetActuallyAllocatedSize(allocated);
       PoisonShadow((uptr)allocated, allocated_size, kAsanHeapLeftRedzoneMagic);
if (new_ptr) {
       // However, we will report racy double-free later anyway.
       REAL(memcpy)(new_ptr, old_ptr, memcpy_size);
       Deallocate(old_ptr, 0, 0, stack, FROM_MALLOC);
     }
     return new_ptr;
   }
 
   void *Calloc(uptr nmemb, uptr size, BufferedStackTrace *stack) {
-    if (CheckForCallocOverflow(size, nmemb))
-      return AsanAllocator::FailureHandler::OnBadRequest();
+    if (UNLIKELY(CheckForCallocOverflow(size, nmemb)))
+      return ReturnNullOrDieOnFailure::OnBadRequest();
     void *ptr = Allocate(nmemb * size, 8, stack, FROM_MALLOC, false);
     // If the memory comes from the secondary allocator no need to clear it
     // as it comes directly from mmap.
     if (ptr && allocator.FromPrimary(ptr))
       REAL(memset)(ptr, 0, nmemb * size);
     return ptr;
   }
 
void *asan_valloc(uptr size, BufferedStackTrace *stack) {
   return SetErrnoOnNull(
       instance.Allocate(size, GetPageSizeCached(), stack, FROM_MALLOC, true));
 }
 
 void *asan_pvalloc(uptr size, BufferedStackTrace *stack) {
   uptr PageSize = GetPageSizeCached();
   if (UNLIKELY(CheckForPvallocOverflow(size, PageSize))) {
     errno = errno_ENOMEM;
-    return AsanAllocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   // pvalloc(0) should allocate one page.
   size = size ? RoundUpTo(size, PageSize) : PageSize;
   return SetErrnoOnNull(
       instance.Allocate(size, PageSize, stack, FROM_MALLOC, true));
 }
 
 void *asan_memalign(uptr alignment, uptr size, BufferedStackTrace *stack,
                     AllocType alloc_type) {
   if (UNLIKELY(!IsPowerOfTwo(alignment))) {
     errno = errno_EINVAL;
-    return AsanAllocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   return SetErrnoOnNull(
       instance.Allocate(size, alignment, stack, alloc_type, true));
 }
 
 int asan_posix_memalign(void **memptr, uptr alignment, uptr size,
                         BufferedStackTrace *stack) {
   if (UNLIKELY(!CheckPosixMemalignAlignment(alignment))) {
-    AsanAllocator::FailureHandler::OnBadRequest();
+    ReturnNullOrDieOnFailure::OnBadRequest();
     return errno_EINVAL;
   }
   void *ptr = instance.Allocate(size, alignment, stack, FROM_MALLOC, true);
   if (UNLIKELY(!ptr))
     return errno_ENOMEM;
   CHECK(IsAligned((uptr)ptr, alignment));
   *memptr = ptr;
   return 0;

compiler-rt/trunk/lib/hwasan/hwasan_allocator.cc

 static void *HwasanAllocate(StackTrace *stack, uptr size, uptr alignment,
                           bool zeroise) {
   alignment = Max(alignment, kShadowAlignment);
   size = RoundUpTo(size, kShadowAlignment);
 
   if (size > kMaxAllowedMallocSize) {
     Report("WARNING: HWAddressSanitizer failed to allocate %p bytes\n",
            (void *)size);
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   HwasanThread *t = GetCurrentThread();
   void *allocated;
   if (t) {
     AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
     allocated = allocator.Allocate(cache, size, alignment);
   } else {
     SpinMutexLock l(&fallback_mutex);
     AllocatorCache *cache = &fallback_allocator_cache;
     allocated = allocator.Allocate(cache, size, alignment);
   }
+  if (UNLIKELY(!allocated))
+    return ReturnNullOrDieOnFailure::OnOOM();
   Metadata *meta =
       reinterpret_cast<Metadata *>(allocator.GetMetaData(allocated));
   meta->state = CHUNK_ALLOCATED;
   meta->requested_size = size;
   meta->alloc_context_id = StackDepotPut(*stack);
   if (zeroise)
     internal_memset(allocated, 0, size);
 

compiler-rt/trunk/lib/lsan/lsan_allocator.cc

 }
 
 void *Allocate(const StackTrace &stack, uptr size, uptr alignment,
                bool cleared) {
   if (size == 0)
     size = 1;
   if (size > kMaxAllowedMallocSize) {
     Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", size);
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   void *p = allocator.Allocate(GetAllocatorCache(), size, alignment);
+  if (UNLIKELY(!p))
+    return ReturnNullOrDieOnFailure::OnOOM();
   // Do not rely on the allocator to clear the memory (it's slow).
   if (cleared && allocator.FromPrimary(p))
     memset(p, 0, size);
   RegisterAllocation(stack, p, size);
   if (&__sanitizer_malloc_hook) __sanitizer_malloc_hook(p, size);
   RunMallocHooks(p, size);
   return p;
 }
 
 static void *Calloc(uptr nmemb, uptr size, const StackTrace &stack) {
   if (UNLIKELY(CheckForCallocOverflow(size, nmemb)))
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   size *= nmemb;
   return Allocate(stack, size, 1, true);
 }
 
 void Deallocate(void *p) {
   if (&__sanitizer_free_hook) __sanitizer_free_hook(p);
   RunFreeHooks(p);
   RegisterDeallocation(p);
   allocator.Deallocate(GetAllocatorCache(), p);
 }
 
 void *Reallocate(const StackTrace &stack, void *p, uptr new_size,
                  uptr alignment) {
   RegisterDeallocation(p);
   if (new_size > kMaxAllowedMallocSize) {
     Report("WARNING: LeakSanitizer failed to allocate %zu bytes\n", new_size);
     allocator.Deallocate(GetAllocatorCache(), p);
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   p = allocator.Reallocate(GetAllocatorCache(), p, new_size, alignment);
   RegisterAllocation(stack, p, new_size);
   return p;
 }
 
 void GetAllocatorCacheRange(uptr *begin, uptr *end) {
   *begin = (uptr)GetAllocatorCache();
   *end = *begin + sizeof(AllocatorCache);
 }
 
 uptr GetMallocUsableSize(const void *p) {
   ChunkMetadata *m = Metadata(p);
   if (!m) return 0;
   return m->requested_size;
 }
 
 void *lsan_memalign(uptr alignment, uptr size, const StackTrace &stack) {
   if (UNLIKELY(!IsPowerOfTwo(alignment))) {
     errno = errno_EINVAL;
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   return SetErrnoOnNull(Allocate(stack, size, alignment, kAlwaysClearMemory));
 }
 
 void *lsan_malloc(uptr size, const StackTrace &stack) {
   return SetErrnoOnNull(Allocate(stack, size, 1, kAlwaysClearMemory));
 }
 

compiler-rt/trunk/lib/msan/msan_allocator.cc

void MsanThreadLocalMallocStorage::CommitBack() {
   allocator.SwallowCache(GetAllocatorCache(this));
 }
 
 static void *MsanAllocate(StackTrace *stack, uptr size, uptr alignment,
                           bool zeroise) {
   if (size > kMaxAllowedMallocSize) {
     Report("WARNING: MemorySanitizer failed to allocate %p bytes\n",
            (void *)size);
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   MsanThread *t = GetCurrentThread();
   void *allocated;
   if (t) {
     AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
     allocated = allocator.Allocate(cache, size, alignment);
   } else {
     SpinMutexLock l(&fallback_mutex);
     AllocatorCache *cache = &fallback_allocator_cache;
     allocated = allocator.Allocate(cache, size, alignment);
   }
+  if (UNLIKELY(!allocated))
+    return ReturnNullOrDieOnFailure::OnOOM();
   Metadata *meta =
       reinterpret_cast<Metadata *>(allocator.GetMetaData(allocated));
   meta->requested_size = size;
   if (zeroise) {
     __msan_clear_and_unpoison(allocated, size);
   } else if (flags()->poison_in_malloc) {
     __msan_poison(allocated, size);
     if (__msan_get_track_origins()) {

 }
 
 void *msan_malloc(uptr size, StackTrace *stack) {
   return SetErrnoOnNull(MsanAllocate(stack, size, sizeof(u64), false));
 }
 
 void *msan_calloc(uptr nmemb, uptr size, StackTrace *stack) {
   if (UNLIKELY(CheckForCallocOverflow(size, nmemb)))
-    return SetErrnoOnNull(Allocator::FailureHandler::OnBadRequest());
+    return SetErrnoOnNull(ReturnNullOrDieOnFailure::OnBadRequest());
   return SetErrnoOnNull(MsanAllocate(stack, nmemb * size, sizeof(u64), true));
 }
 
 void *msan_realloc(void *ptr, uptr size, StackTrace *stack) {
   if (!ptr)
     return SetErrnoOnNull(MsanAllocate(stack, size, sizeof(u64), false));
   if (size == 0) {
     MsanDeallocate(stack, ptr);
     return nullptr;
   }
   return SetErrnoOnNull(MsanReallocate(stack, ptr, size, sizeof(u64)));
 }
 
 void *msan_valloc(uptr size, StackTrace *stack) {
   return SetErrnoOnNull(MsanAllocate(stack, size, GetPageSizeCached(), false));
 }
 
 void *msan_pvalloc(uptr size, StackTrace *stack) {
   uptr PageSize = GetPageSizeCached();
   if (UNLIKELY(CheckForPvallocOverflow(size, PageSize))) {
     errno = errno_ENOMEM;
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   // pvalloc(0) should allocate one page.
   size = size ? RoundUpTo(size, PageSize) : PageSize;
   return SetErrnoOnNull(MsanAllocate(stack, size, PageSize, false));
 }
 
 void *msan_aligned_alloc(uptr alignment, uptr size, StackTrace *stack) {
   if (UNLIKELY(!CheckAlignedAllocAlignmentAndSize(alignment, size))) {
     errno = errno_EINVAL;
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   return SetErrnoOnNull(MsanAllocate(stack, size, alignment, false));
 }
 
 void *msan_memalign(uptr alignment, uptr size, StackTrace *stack) {
   if (UNLIKELY(!IsPowerOfTwo(alignment))) {
     errno = errno_EINVAL;
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   return SetErrnoOnNull(MsanAllocate(stack, size, alignment, false));
 }
 
 int msan_posix_memalign(void **memptr, uptr alignment, uptr size,
                         StackTrace *stack) {
   if (UNLIKELY(!CheckPosixMemalignAlignment(alignment))) {
-    Allocator::FailureHandler::OnBadRequest();
+    ReturnNullOrDieOnFailure::OnBadRequest();
     return errno_EINVAL;
   }
   void *ptr = MsanAllocate(stack, size, alignment, false);
   if (UNLIKELY(!ptr))
     return errno_ENOMEM;
   CHECK(IsAligned((uptr)ptr, alignment));
   *memptr = ptr;
   return 0;

compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator.cc

 #endif  // SANITIZER_GO || defined(SANITIZER_USE_MALLOC)
 
 const u64 kBlockMagic = 0x6A6CB03ABCEBC041ull;
 
 void *InternalAlloc(uptr size, InternalAllocatorCache *cache, uptr alignment) {
   if (size + sizeof(u64) < size)
     return nullptr;
   void *p = RawInternalAlloc(size + sizeof(u64), cache, alignment);
-  if (!p)
-    return nullptr;
+  if (UNLIKELY(!p))
+    return DieOnFailure::OnOOM();
   ((u64*)p)[0] = kBlockMagic;
   return (char*)p + sizeof(u64);
 }
 
 void *InternalRealloc(void *addr, uptr size, InternalAllocatorCache *cache) {
   if (!addr)
     return InternalAlloc(size, cache);
   if (size + sizeof(u64) < size)
     return nullptr;
   addr = (char*)addr - sizeof(u64);
   size = size + sizeof(u64);
   CHECK_EQ(kBlockMagic, ((u64*)addr)[0]);
   void *p = RawInternalRealloc(addr, size, cache);
-  if (!p)
-    return nullptr;
+  if (UNLIKELY(!p))
+    return DieOnFailure::OnOOM();
   return (char*)p + sizeof(u64);
 }
 
 void *InternalCalloc(uptr count, uptr size, InternalAllocatorCache *cache) {
   if (UNLIKELY(CheckForCallocOverflow(count, size)))
-    return InternalAllocator::FailureHandler::OnBadRequest();
+    return DieOnFailure::OnBadRequest();
   void *p = InternalAlloc(count * size, cache);
-  if (p) internal_memset(p, 0, count * size);
+  if (LIKELY(p))
+    internal_memset(p, 0, count * size);
   return p;
 }
 
 void InternalFree(void *addr, InternalAllocatorCache *cache) {
   if (!addr)
     return;
   addr = (char*)addr - sizeof(u64);
   CHECK_EQ(kBlockMagic, ((u64*)addr)[0]);

compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator_combined.h

 // PrimaryAllocator is efficient, but may not allocate some sizes (alignments).
 //  When allocating 2^x bytes it should return 2^x aligned chunk.
 // PrimaryAllocator is used via a local AllocatorCache.
 // SecondaryAllocator can allocate anything, but is not efficient.
 template <class PrimaryAllocator, class AllocatorCache,
           class SecondaryAllocator>  // NOLINT
 class CombinedAllocator {
  public:
-  typedef typename SecondaryAllocator::FailureHandler FailureHandler;
-
   void InitLinkerInitialized(s32 release_to_os_interval_ms) {
     primary_.Init(release_to_os_interval_ms);
     secondary_.InitLinkerInitialized();
     stats_.InitLinkerInitialized();
   }
 
   void Init(s32 release_to_os_interval_ms) {
     primary_.Init(release_to_os_interval_ms);
     secondary_.Init();
     stats_.Init();
   }
 
   void *Allocate(AllocatorCache *cache, uptr size, uptr alignment) {
     // Returning 0 on malloc(0) may break a lot of code.
     if (size == 0)
       size = 1;
-    if (size + alignment < size)
-      return FailureHandler::OnBadRequest();
+    if (size + alignment < size) {
+      Report("WARNING: %s: CombinedAllocator allocation overflow: "
+             "0x%zx bytes with 0x%zx alignment requested\n",
+             SanitizerToolName, size, alignment);
+      return nullptr;
+    }
     uptr original_size = size;
     // If alignment requirements are to be fulfilled by the frontend allocator
     // rather than by the primary or secondary, passing an alignment lower than
     // or equal to 8 will prevent any further rounding up, as well as the later
     // alignment check.
     if (alignment > 8)
       size = RoundUpTo(size, alignment);
     // The primary allocator should return a 2^x aligned allocation when
     // requested 2^x bytes, hence using the rounded up 'size' when being
     // serviced by the primary (this is no longer true when the primary is
     // using a non-fixed base address). The secondary takes care of the
     // alignment without such requirement, and allocating 'size' would use
     // extraneous memory, so we employ 'original_size'.
     void *res;
     if (primary_.CanAllocate(size, alignment))
       res = cache->Allocate(&primary_, primary_.ClassID(size));
     else
       res = secondary_.Allocate(&stats_, original_size, alignment);
-    if (!res)
-      return FailureHandler::OnOOM();
     if (alignment > 8)
       CHECK_EQ(reinterpret_cast<uptr>(res) & (alignment - 1), 0);
     return res;
   }
 
   s32 ReleaseToOSIntervalMs() const {
     return primary_.ReleaseToOSIntervalMs();
   }

compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator_internal.h

struct AP32 {
   static const uptr kFlags = 0;
 };
 typedef SizeClassAllocator32<AP32> PrimaryInternalAllocator;
 
 typedef SizeClassAllocatorLocalCache<PrimaryInternalAllocator>
     InternalAllocatorCache;
 
 typedef CombinedAllocator<PrimaryInternalAllocator, InternalAllocatorCache,
-                          LargeMmapAllocator<NoOpMapUnmapCallback, DieOnFailure>
+                          LargeMmapAllocator<NoOpMapUnmapCallback>
                          > InternalAllocator;
 
 void *InternalAlloc(uptr size, InternalAllocatorCache *cache = nullptr,
                     uptr alignment = 0);
 void *InternalRealloc(void *p, uptr size,
                       InternalAllocatorCache *cache = nullptr);
 void *InternalCalloc(uptr countr, uptr size,
                      InternalAllocatorCache *cache = nullptr);

compiler-rt/trunk/lib/sanitizer_common/sanitizer_allocator_secondary.h

 //===----------------------------------------------------------------------===//
 #ifndef SANITIZER_ALLOCATOR_H
 #error This file must be included inside sanitizer_allocator.h
 #endif
 
 // This class can (de)allocate only large chunks of memory using mmap/unmap.
 // The main purpose of this allocator is to cover large and rare allocation
 // sizes not covered by more efficient allocators (e.g. SizeClassAllocator64).
-template <class MapUnmapCallback = NoOpMapUnmapCallback,
-          class FailureHandlerT = ReturnNullOrDieOnFailure>
+template <class MapUnmapCallback = NoOpMapUnmapCallback>
 class LargeMmapAllocator {
  public:
-  typedef FailureHandlerT FailureHandler;
-
   void InitLinkerInitialized() {
     page_size_ = GetPageSizeCached();
   }
 
   void Init() {
     internal_memset(this, 0, sizeof(*this));
     InitLinkerInitialized();
   }
 
   void *Allocate(AllocatorStats *stat, uptr size, uptr alignment) {
     CHECK(IsPowerOfTwo(alignment));
     uptr map_size = RoundUpMapSize(size);
     if (alignment > page_size_)
       map_size += alignment;
     // Overflow.
-    if (map_size < size)
-      return FailureHandler::OnBadRequest();
+    if (map_size < size) {
+      Report("WARNING: %s: LargeMmapAllocator allocation overflow: "
+             "0x%zx bytes with 0x%zx alignment requested\n",
+             SanitizerToolName, map_size, alignment);
+      return nullptr;
+    }
     uptr map_beg = reinterpret_cast<uptr>(
         MmapOrDieOnFatalError(map_size, "LargeMmapAllocator"));
     if (!map_beg)
-      return FailureHandler::OnOOM();
+      return nullptr;
     CHECK(IsAligned(map_beg, page_size_));
     MapUnmapCallback().OnMap(map_beg, map_size);
     uptr map_end = map_beg + map_size;
     uptr res = map_beg + page_size_;
     if (res & (alignment - 1))  // Align.
       res += alignment - (res & (alignment - 1));
     CHECK(IsAligned(res, alignment));
     CHECK(IsAligned(res, page_size_));

compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_allocator_test.cc

TEST(SanitizerCommon, SizeClassAllocator32MapUnmapCallback) {
   // fprintf(stderr, "Map: %d Unmap: %d\n",
   //         TestMapUnmapCallback::map_count,
   //         TestMapUnmapCallback::unmap_count);
 }
 
 TEST(SanitizerCommon, LargeMmapAllocatorMapUnmapCallback) {
   TestMapUnmapCallback::map_count = 0;
   TestMapUnmapCallback::unmap_count = 0;
-  LargeMmapAllocator<TestMapUnmapCallback, DieOnFailure> a;
+  LargeMmapAllocator<TestMapUnmapCallback> a;
   a.Init();
   AllocatorStats stats;
   stats.Init();
   void *x = a.Allocate(&stats, 1 << 20, 1);
   EXPECT_EQ(TestMapUnmapCallback::map_count, 1);
   a.Deallocate(&stats, x);
   EXPECT_EQ(TestMapUnmapCallback::unmap_count, 1);
 }
TEST(SanitizerCommon, SizeClassAllocator64Overflow) {
   }
   EXPECT_EQ(allocation_failed, true);
 
   a.TestOnlyUnmap();
 }
 #endif
 
 TEST(SanitizerCommon, LargeMmapAllocator) {
-  LargeMmapAllocator<NoOpMapUnmapCallback, DieOnFailure> a;
+  LargeMmapAllocator<NoOpMapUnmapCallback> a;
   a.Init();
   AllocatorStats stats;
   stats.Init();
 
   static const int kNumAllocs = 1000;
   char *allocated[kNumAllocs];
   static const uptr size = 4000;
   // Allocate some.

 }
 
 template
 <class PrimaryAllocator, class SecondaryAllocator, class AllocatorCache>
 void TestCombinedAllocator() {
   typedef
       CombinedAllocator<PrimaryAllocator, AllocatorCache, SecondaryAllocator>
       Allocator;
-  SetAllocatorMayReturnNull(true);
   Allocator *a = new Allocator;
   a->Init(kReleaseToOSIntervalNever);
   std::mt19937 r;
 
   AllocatorCache cache;
   memset(&cache, 0, sizeof(cache));
   a->InitCache(&cache);
 
   EXPECT_EQ(a->Allocate(&cache, -1, 1), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, -1, 1024), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, (uptr)-1 - 1024, 1), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, (uptr)-1 - 1024, 1024), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, (uptr)-1 - 1023, 1024), (void*)0);
-
-  // Set to false
-  SetAllocatorMayReturnNull(false);
-  EXPECT_DEATH(a->Allocate(&cache, -1, 1),
-               "allocator is terminating the process");
+  EXPECT_EQ(a->Allocate(&cache, -1, 1), (void*)0);
 
   const uptr kNumAllocs = 100000;
   const uptr kNumIter = 10;
   for (uptr iter = 0; iter < kNumIter; iter++) {
     std::vector<void*> allocated;
     for (uptr i = 0; i < kNumAllocs; i++) {
       uptr size = (i % (1 << 14)) + 1;
       if ((i % 1024) == 0)

 #endif
 #endif
 
 TEST(SanitizerCommon, SizeClassAllocator32Iteration) {
   TestSizeClassAllocatorIteration<Allocator32Compact>();
 }
 
 TEST(SanitizerCommon, LargeMmapAllocatorIteration) {
-  LargeMmapAllocator<NoOpMapUnmapCallback, DieOnFailure> a;
+  LargeMmapAllocator<NoOpMapUnmapCallback> a;
   a.Init();
   AllocatorStats stats;
   stats.Init();
 
   static const uptr kNumAllocs = 1000;
   char *allocated[kNumAllocs];
   static const uptr size = 40;
   // Allocate some.
for (uptr i = 0; i < kNumAllocs; i++) {
     ASSERT_NE(reported_chunks.find(reinterpret_cast<uptr>(allocated[i])),
               reported_chunks.end());
   }
   for (uptr i = 0; i < kNumAllocs; i++)
     a.Deallocate(&stats, allocated[i]);
 }
 
 TEST(SanitizerCommon, LargeMmapAllocatorBlockBegin) {
-  LargeMmapAllocator<NoOpMapUnmapCallback, DieOnFailure> a;
+  LargeMmapAllocator<NoOpMapUnmapCallback> a;
   a.Init();
   AllocatorStats stats;
   stats.Init();
 
   static const uptr kNumAllocs = 1024;
   static const uptr kNumExpectedFalseLookups = 10000000;
   char *allocated[kNumAllocs];
   static const uptr size = 4096;

compiler-rt/trunk/lib/tsan/rtl/tsan_mman.cc

static void SignalUnsafeCall(ThreadState *thr, uptr pc) {
   ScopedReport rep(ReportTypeSignalUnsafe);
   rep.AddStack(stack, true);
   OutputReport(thr, rep);
 }
 
 void *user_alloc_internal(ThreadState *thr, uptr pc, uptr sz, uptr align,
                           bool signal) {
   if ((sz >= (1ull << 40)) || (align >= (1ull << 40)))
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   void *p = allocator()->Allocate(&thr->proc()->alloc_cache, sz, align);
   if (UNLIKELY(p == 0))
-    return 0;
+    return ReturnNullOrDieOnFailure::OnOOM();
   if (ctx && ctx->initialized)
     OnUserAlloc(thr, pc, (uptr)p, sz, true);
   if (signal)
     SignalUnsafeCall(thr, pc);
   return p;
 }
 
 void user_free(ThreadState *thr, uptr pc, void *p, bool signal) {
   ScopedGlobalProcessor sgp;
   if (ctx && ctx->initialized)
     OnUserFree(thr, pc, (uptr)p, true);
   allocator()->Deallocate(&thr->proc()->alloc_cache, p);
   if (signal)
     SignalUnsafeCall(thr, pc);
 }
 
 void *user_alloc(ThreadState *thr, uptr pc, uptr sz) {
   return SetErrnoOnNull(user_alloc_internal(thr, pc, sz, kDefaultAlignment));
 }
 
 void *user_calloc(ThreadState *thr, uptr pc, uptr size, uptr n) {
   if (UNLIKELY(CheckForCallocOverflow(size, n)))
-    return SetErrnoOnNull(Allocator::FailureHandler::OnBadRequest());
+    return SetErrnoOnNull(ReturnNullOrDieOnFailure::OnBadRequest());
   void *p = user_alloc_internal(thr, pc, n * size);
   if (p)
     internal_memset(p, 0, n * size);
   return SetErrnoOnNull(p);
 }
 
 void OnUserAlloc(ThreadState *thr, uptr pc, uptr p, uptr sz, bool write) {
   DPrintf("#%d: alloc(%zu) = %p\n", thr->tid, sz, p);
if (new_p) {
     user_free(thr, pc, p);
   }
   return SetErrnoOnNull(new_p);
 }
 
 void *user_memalign(ThreadState *thr, uptr pc, uptr align, uptr sz) {
   if (UNLIKELY(!IsPowerOfTwo(align))) {
     errno = errno_EINVAL;
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   return SetErrnoOnNull(user_alloc_internal(thr, pc, sz, align));
 }
 
 int user_posix_memalign(ThreadState *thr, uptr pc, void **memptr, uptr align,
                         uptr sz) {
   if (UNLIKELY(!CheckPosixMemalignAlignment(align))) {
-    Allocator::FailureHandler::OnBadRequest();
+    ReturnNullOrDieOnFailure::OnBadRequest();
     return errno_EINVAL;
   }
   void *ptr = user_alloc_internal(thr, pc, sz, align);
   if (UNLIKELY(!ptr))
     return errno_ENOMEM;
   CHECK(IsAligned((uptr)ptr, align));
   *memptr = ptr;
   return 0;
 }
 
 void *user_aligned_alloc(ThreadState *thr, uptr pc, uptr align, uptr sz) {
   if (UNLIKELY(!CheckAlignedAllocAlignmentAndSize(align, sz))) {
     errno = errno_EINVAL;
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   return SetErrnoOnNull(user_alloc_internal(thr, pc, sz, align));
 }
 
 void *user_valloc(ThreadState *thr, uptr pc, uptr sz) {
   return SetErrnoOnNull(user_alloc_internal(thr, pc, sz, GetPageSizeCached()));
 }
 
 void *user_pvalloc(ThreadState *thr, uptr pc, uptr sz) {
   uptr PageSize = GetPageSizeCached();
   if (UNLIKELY(CheckForPvallocOverflow(sz, PageSize))) {
     errno = errno_ENOMEM;
-    return Allocator::FailureHandler::OnBadRequest();
+    return ReturnNullOrDieOnFailure::OnBadRequest();
   }
   // pvalloc(0) should allocate one page.
   sz = sz ? RoundUpTo(sz, PageSize) : PageSize;
   return SetErrnoOnNull(user_alloc_internal(thr, pc, sz, PageSize));
 }
 
 uptr user_alloc_usable_size(const void *p) {
   if (p == 0)