1 files changed, 151 insertions, 0 deletions
diff --git a/gcc-4.9/libsanitizer/sanitizer_common/sanitizer_allocator.cc b/gcc-4.9/libsanitizer/sanitizer_common/sanitizer_allocator.cc
new file mode 100644
index 000000000..9d38e9429
--- /dev/null
+++ b/gcc-4.9/libsanitizer/sanitizer_common/sanitizer_allocator.cc
@@ -0,0 +1,151 @@
+//===-- sanitizer_allocator.cc --------------------------------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer
+// run-time libraries.
+// This allocator is used inside run-times.
+//===----------------------------------------------------------------------===//
+#include "sanitizer_allocator.h"
+#include "sanitizer_allocator_internal.h"
+#include "sanitizer_common.h"
+#include "sanitizer_flags.h"
+
+namespace __sanitizer {
+
+// ThreadSanitizer for Go uses libc malloc/free.
+#if defined(SANITIZER_GO)
+# if SANITIZER_LINUX && !SANITIZER_ANDROID
+extern "C" void *__libc_malloc(uptr size);
+extern "C" void __libc_free(void *ptr);
+#  define LIBC_MALLOC __libc_malloc
+#  define LIBC_FREE __libc_free
+# else
+#  include <stdlib.h>
+#  define LIBC_MALLOC malloc
+#  define LIBC_FREE free
+# endif
+
+static void *RawInternalAlloc(uptr size, InternalAllocatorCache *cache) {
+  (void)cache;
+  return LIBC_MALLOC(size);
+}
+
+static void RawInternalFree(void *ptr, InternalAllocatorCache *cache) {
+  (void)cache;
+  LIBC_FREE(ptr);
+}
+
+InternalAllocator *internal_allocator() {
+  return 0;
+}
+
+#else  // SANITIZER_GO
+
+static ALIGNED(64) char internal_alloc_placeholder[sizeof(InternalAllocator)];
+static atomic_uint8_t internal_allocator_initialized;
+static StaticSpinMutex internal_alloc_init_mu;
+
+static InternalAllocatorCache internal_allocator_cache;
+static StaticSpinMutex internal_allocator_cache_mu;
+
+InternalAllocator *internal_allocator() {
+  InternalAllocator *internal_allocator_instance =
+      reinterpret_cast<InternalAllocator *>(&internal_alloc_placeholder);
+  if (atomic_load(&internal_allocator_initialized, memory_order_acquire) == 0) {
+    SpinMutexLock l(&internal_alloc_init_mu);
+    if (atomic_load(&internal_allocator_initialized, memory_order_relaxed) ==
+        0) {
+      internal_allocator_instance->Init();
+      atomic_store(&internal_allocator_initialized, 1, memory_order_release);
+    }
+  }
+  return internal_allocator_instance;
+}
+
+static void *RawInternalAlloc(uptr size, InternalAllocatorCache *cache) {
+  if (cache == 0) {
+    SpinMutexLock l(&internal_allocator_cache_mu);
+    return internal_allocator()->Allocate(&internal_allocator_cache, size, 8,
+                                          false);
+  }
+  return internal_allocator()->Allocate(cache, size, 8, false);
+}
+
+static void RawInternalFree(void *ptr, InternalAllocatorCache *cache) {
+  if (cache == 0) {
+    SpinMutexLock l(&internal_allocator_cache_mu);
+    return internal_allocator()->Deallocate(&internal_allocator_cache, ptr);
+  }
+  internal_allocator()->Deallocate(cache, ptr);
+}
+
+#endif  // SANITIZER_GO
+
+const u64 kBlockMagic = 0x6A6CB03ABCEBC041ull;
+
+void *InternalAlloc(uptr size, InternalAllocatorCache *cache) {
+  if (size + sizeof(u64) < size)
+    return 0;
+  void *p = RawInternalAlloc(size + sizeof(u64), cache);
+  if (p == 0)
+    return 0;
+  ((u64*)p)[0] = kBlockMagic;
+  return (char*)p + sizeof(u64);
+}
+
+void InternalFree(void *addr, InternalAllocatorCache *cache) {
+  if (addr == 0)
+    return;
+  addr = (char*)addr - sizeof(u64);
+  CHECK_EQ(kBlockMagic, ((u64*)addr)[0]);
+  ((u64*)addr)[0] = 0;
+  RawInternalFree(addr, cache);
+}
+
+// LowLevelAllocator
+static LowLevelAllocateCallback low_level_alloc_callback;
+
+void *LowLevelAllocator::Allocate(uptr size) {
+  // Align allocation size.
+  size = RoundUpTo(size, 8);
+  if (allocated_end_ - allocated_current_ < (sptr)size) {
+    uptr size_to_allocate = Max(size, GetPageSizeCached());
+    allocated_current_ =
+        (char*)MmapOrDie(size_to_allocate, __FUNCTION__);
+    allocated_end_ = allocated_current_ + size_to_allocate;
+    if (low_level_alloc_callback) {
+      low_level_alloc_callback((uptr)allocated_current_,
+                               size_to_allocate);
+    }
+  }
+  CHECK(allocated_end_ - allocated_current_ >= (sptr)size);
+  void *res = allocated_current_;
+  allocated_current_ += size;
+  return res;
+}
+
+void SetLowLevelAllocateCallback(LowLevelAllocateCallback callback) {
+  low_level_alloc_callback = callback;
+}
+
+bool CallocShouldReturnNullDueToOverflow(uptr size, uptr n) {
+  if (!size) return false;
+  uptr max = (uptr)-1L;
+  return (max / size) < n;
+}
+
+void *AllocatorReturnNull() {
+  if (common_flags()->allocator_may_return_null)
+    return 0;
+  Report("%s's allocator is terminating the process instead of returning 0\n",
+         SanitizerToolName);
+  Report("If you don't like this behavior set allocator_may_return_null=1\n");
+  CHECK(0);
+  return 0;
+}
+
+}  // namespace __sanitizer