[asan] introduce asan_allocator2.cc, which will have the replacement for asan allocator (now, just a bit of boilerplate)

llvm-svn: 169733

compiler-rt/lib/asan/CMakeLists.txt

@@ -2,6 +2,7 @@
 
 set(ASAN_SOURCES
   asan_allocator.cc
+  asan_allocator2.cc
   asan_globals.cc
   asan_interceptors.cc
   asan_linux.cc

compiler-rt/lib/asan/asan_allocator.cc

@@ -24,8 +24,9 @@
 // Once freed, the body of the chunk contains the stack trace of the free call.
 //
 //===----------------------------------------------------------------------===//
-
 #include "asan_allocator.h"
+
+#if ASAN_ALLOCATOR_VERSION == 1
 #include "asan_interceptors.h"
 #include "asan_internal.h"
 #include "asan_lock.h"
@@ -1049,3 +1050,4 @@ uptr __asan_get_allocated_size(const void *p) {
   }
   return allocated_size;
 }
+#endif  // ASAN_ALLOCATOR_VERSION

compiler-rt/lib/asan/asan_allocator.h

@@ -18,6 +18,12 @@
 #include "asan_internal.h"
 #include "asan_interceptors.h"
 
+// We are in the process of transitioning from the old allocator (version 1)
+// to a new one (version 2). The change is quite intrusive so both allocators
+// will co-exist in the source base for a while. The actual allocator is chosen
+// at build time by redefining this macrozz.
+#define ASAN_ALLOCATOR_VERSION 1
+
 namespace __asan {
 
 static const uptr kNumberOfSizeClasses = 255;

compiler-rt/lib/asan/asan_allocator2.cc

@@ -0,0 +1,43 @@
+//===-- asan_allocator2.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 a part of AddressSanitizer, an address sanity checker.
+//
+// Implementation of ASan's memory allocator, 2-nd version.
+// This variant uses the allocator from sanitizer_common, i.e. the one shared
+// with ThreadSanitizer and MemorySanitizer.
+//
+// Status: under development, not enabled by default yet.
+//===----------------------------------------------------------------------===//
+#include "asan_allocator.h"
+#if ASAN_ALLOCATOR_VERSION == 2
+
+#include "sanitizer_common/sanitizer_allocator.h"
+
+namespace __asan {
+
+#if SANITIZER_WORDSIZE == 64
+const uptr kAllocatorSpace = 0x600000000000ULL;
+const uptr kAllocatorSize  =  0x10000000000ULL;  // 1T.
+typedef SizeClassAllocator64<kAllocatorSpace, kAllocatorSize, 0 /*metadata*/,
+    DefaultSizeClassMap> PrimaryAllocator;
+#elif SANITIZER_WORDSIZE == 32
+static const u64 kAddressSpaceSize = 1ULL << 32;
+typedef SizeClassAllocator32<
+  0, kAddressSpaceSize, 16, CompactSizeClassMap> PrimaryAllocator;
+#endif
+
+typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
+typedef LargeMmapAllocator SecondaryAllocator;
+typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,
+    SecondaryAllocator> Allocator;
+
+
+}  // namespace __asan
+#endif  // ASAN_ALLOCATOR_VERSION