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

src/extensions/free-buffer-extension.cc

Index: src/extensions/free-buffer-extension.cc
diff --git a/src/default-platform.cc b/src/extensions/free-buffer-extension.cc
similarity index 66%
copy from src/default-platform.cc
copy to src/extensions/free-buffer-extension.cc
index ef3c4ebd450bbc63ae99b4534a22fa5bd67a2f39..4040c90bffe4b2ac6f7088c267758cb5b81ca677 100644
--- a/src/default-platform.cc
+++ b/src/extensions/free-buffer-extension.cc
@@ -25,32 +25,35 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include "free-buffer-extension.h"
+#include "platform.h"
 #include "v8.h"
 
-#include "default-platform.h"
-
 namespace v8 {
 namespace internal {
 
 
-DefaultPlatform::DefaultPlatform() {}
-
+v8::Handle<v8::FunctionTemplate> FreeBufferExtension::GetNativeFunction(
+    v8::Handle<v8::String> str) {
+  return v8::FunctionTemplate::New(FreeBufferExtension::FreeBuffer);
+}
 
-DefaultPlatform::~DefaultPlatform() {}
 
-void DefaultPlatform::CallOnBackgroundThread(Task *task,
-                                             ExpectedRuntime expected_runtime) {
-  // TODO(jochen): implement.
-  task->Run();
-  delete task;
+void FreeBufferExtension::FreeBuffer(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  v8::Handle<v8::ArrayBuffer> arrayBuffer = args[0].As<v8::ArrayBuffer>();
+  v8::ArrayBuffer::Contents contents = arrayBuffer->Externalize();
+  V8::ArrayBufferAllocator()->Free(contents.Data(), contents.ByteLength());
 }
 
 
-void DefaultPlatform::CallOnForegroundThread(v8::Isolate* isolate, Task* task) {
-  // TODO(jochen): implement.
-  task->Run();
-  delete task;
-}
+void FreeBufferExtension::Register() {
+  static char buffer[100];
+  Vector<char> temp_vector(buffer, sizeof(buffer));
+  OS::SNPrintF(temp_vector, "native function freeBuffer();");
 
+  static FreeBufferExtension buffer_free_extension(buffer);
+  static v8::DeclareExtension declaration(&buffer_free_extension);
+}
 
 } }  // namespace v8::internal