MemorySanitizer support.

runtime/vm/exceptions.cc

Index: runtime/vm/exceptions.cc
===================================================================
--- runtime/vm/exceptions.cc	(revision 42458)
+++ runtime/vm/exceptions.cc	(working copy)
@@ -4,6 +4,8 @@
 
 #include "vm/exceptions.h"
 
+#include "platform/address_sanitizer.h"
+
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ -15,19 +17,6 @@
 #include "vm/symbols.h"
 #include "vm/tags.h"
 
-// Allow the use of ASan (AddressSanitizer). This is needed as ASan needs to be
-// told about areas where the VM does the equivalent of a long-jump.
-#if defined(__has_feature)
-#if __has_feature(address_sanitizer)
-extern "C" void __asan_unpoison_memory_region(void *, size_t);
-#else  // __has_feature(address_sanitizer)
-void __asan_unpoison_memory_region(void* ignore1, size_t ignore2) {}
-#endif  // __has_feature(address_sanitizer)
-#else  // defined(__has_feature)
-void __asan_unpoison_memory_region(void* ignore1, size_t ignore2) {}
-#endif  // defined(__has_feature)
-
-
 namespace dart {
 
 DEFINE_FLAG(bool, print_stacktrace_at_throw, false,
@@ -310,8 +299,8 @@
 
   // Unpoison the stack before we tear it down in the generated stub code.
   uword current_sp = reinterpret_cast<uword>(&program_counter) - 1024;
-  __asan_unpoison_memory_region(reinterpret_cast<void*>(current_sp),
-                                stack_pointer - current_sp);
+  ASAN_UNPOISON(reinterpret_cast<void*>(current_sp),
+                stack_pointer - current_sp);
 
   func(program_counter, stack_pointer, frame_pointer,
        raw_exception, raw_stacktrace, isolate);