1 files changed, 59 insertions, 0 deletions
diff --git a/lib/sanitizer_common/sanitizer_allocator.cc b/lib/sanitizer_common/sanitizer_allocator.cc
new file mode 100644
index 0000000..816fddf
--- /dev/null
+++ b/lib/sanitizer_common/sanitizer_allocator.cc
@@ -0,0 +1,59 @@
+//===-- sanitizer_allocator.cc --------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// 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 that is used inside run-times.
+//===----------------------------------------------------------------------===//
+#include "sanitizer_common.h"
+
+// FIXME: We should probably use more low-level allocator that would
+// mmap some pages and split them into chunks to fulfill requests.
+#ifdef __linux__
+extern "C" void *__libc_malloc(__sanitizer::uptr size);
+extern "C" void __libc_free(void *ptr);
+# define LIBC_MALLOC __libc_malloc
+# define LIBC_FREE __libc_free
+#else  // __linux__
+# include <stdlib.h>
+# define LIBC_MALLOC malloc
+# define LIBC_FREE free
+#endif  // __linux__
+
+namespace __sanitizer {
+
+const u64 kBlockMagic = 0x6A6CB03ABCEBC041ull;
+
+void *InternalAlloc(uptr size) {
+  if (size + sizeof(u64) < size)
+    return 0;
+  void *p = LIBC_MALLOC(size + sizeof(u64));
+  if (p == 0)
+    return 0;
+  ((u64*)p)[0] = kBlockMagic;
+  return (char*)p + sizeof(u64);
+}
+
+void InternalFree(void *addr) {
+  if (addr == 0)
+    return;
+  addr = (char*)addr - sizeof(u64);
+  CHECK_EQ(((u64*)addr)[0], kBlockMagic);
+  ((u64*)addr)[0] = 0;
+  LIBC_FREE(addr);
+}
+
+void *InternalAllocBlock(void *p) {
+  CHECK_NE(p, (void*)0);
+  u64 *pp = (u64*)((uptr)p & ~0x7);
+  for (; pp[0] != kBlockMagic; pp--) {}
+  return pp + 1;
+}
+
+}  // namespace __sanitizer