Provide "freeBuffer()" primitive for testing under ASan.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 67b579899fd4ea265fae4c3de22fb87e708a3afc..660a76e2ecb4aa1fabd95b589063c327b494f4d6 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -41,6 +41,7 @@
 #include "platform.h"
 #include "snapshot.h"
 #include "trig-table.h"
+#include "extensions/free-buffer-extension.h"

[Michael Achenbach, 2013/11/26 15:08:57]

Is an #ifdef ADDRESS_SANITIZER necessary here?

[Dmitry Lomov (no reviews), 2013/11/26 15:22:10]

Not necessary,  since the act of including the header does not affect anything,
and we have at least some compilation validation.

 #include "extensions/externalize-string-extension.h"
 #include "extensions/gc-extension.h"
 #include "extensions/statistics-extension.h"
@@ -100,6 +101,9 @@ void Bootstrapper::Initialize(bool create_heap_objects) {
 
 
 void Bootstrapper::InitializeOncePerProcess() {
+#ifdef ADDRESS_SANITIZER
+  FreeBufferExtension::Register();
+#endif
   GCExtension::Register();
   ExternalizeStringExtension::Register();
   StatisticsExtension::Register();
@@ -2278,6 +2282,11 @@ bool Genesis::InstallExtensions(Handle<Context> native_context,
     current = current->next();
   }
 
+#ifdef ADDRESS_SANITIZER
+  if (FLAG_expose_free_buffer) {
+    InstallExtension(isolate, "v8/free-buffer", &extension_states);
+  }
+#endif
   if (FLAG_expose_gc) InstallExtension(isolate, "v8/gc", &extension_states);
   if (FLAG_expose_externalize_string) {
     InstallExtension(isolate, "v8/externalize", &extension_states);