Reland "Remove the weak list of array buffers"

test/cctest/test-weaktypedarrays.cc

-// Copyright 2013 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (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 <stdlib.h>
-
-#include "src/v8.h"
-#include "test/cctest/cctest.h"
-
-#include "src/api.h"
-#include "src/heap/heap.h"
-#include "src/objects.h"
-
-using namespace v8::internal;
-
-static Isolate* GetIsolateFrom(LocalContext* context) {
-  return reinterpret_cast<Isolate*>((*context)->GetIsolate());
-}
-
-
-static int CountArrayBuffersInWeakList(Heap* heap) {
-  int count = 0;
-  for (Object* o = heap->array_buffers_list();
-       !o->IsUndefined();
-       o = JSArrayBuffer::cast(o)->weak_next()) {
-    count++;
-  }
-  return count;
-}
-
-
-static bool HasArrayBufferInWeakList(Heap* heap, JSArrayBuffer* ab) {
-  for (Object* o = heap->array_buffers_list();
-       !o->IsUndefined();
-       o = JSArrayBuffer::cast(o)->weak_next()) {
-    if (ab == o) return true;
-  }
-  return false;
-}
-
-
-TEST(WeakArrayBuffersFromScript) {
-  v8::V8::Initialize();
-  LocalContext context;
-  Isolate* isolate = GetIsolateFrom(&context);
-  int start = CountArrayBuffersInWeakList(isolate->heap());
-
-  for (int i = 1; i <= 3; i++) {
-    // Create 3 array buffers, make i-th of them garbage,
-    // validate correct state of array buffer weak list.
-    CHECK_EQ(start, CountArrayBuffersInWeakList(isolate->heap()));
-    {
-      v8::HandleScope scope(context->GetIsolate());
-
-      {
-        v8::HandleScope s1(context->GetIsolate());
-        CompileRun("var ab1 = new ArrayBuffer(256);"
-                   "var ab2 = new ArrayBuffer(256);"
-                   "var ab3 = new ArrayBuffer(256);");
-        v8::Handle<v8::ArrayBuffer> ab1 =
-            v8::Handle<v8::ArrayBuffer>::Cast(CompileRun("ab1"));
-        v8::Handle<v8::ArrayBuffer> ab2 =
-            v8::Handle<v8::ArrayBuffer>::Cast(CompileRun("ab2"));
-        v8::Handle<v8::ArrayBuffer> ab3 =
-            v8::Handle<v8::ArrayBuffer>::Cast(CompileRun("ab3"));
-
-        CHECK_EQ(3, CountArrayBuffersInWeakList(isolate->heap()) - start);
-        CHECK(HasArrayBufferInWeakList(isolate->heap(),
-              *v8::Utils::OpenHandle(*ab1)));
-        CHECK(HasArrayBufferInWeakList(isolate->heap(),
-              *v8::Utils::OpenHandle(*ab2)));
-        CHECK(HasArrayBufferInWeakList(isolate->heap(),
-              *v8::Utils::OpenHandle(*ab3)));
-      }
-
-      i::ScopedVector<char> source(1024);
-      i::SNPrintF(source, "ab%d = null;", i);
-      CompileRun(source.start());
-      isolate->heap()->CollectAllGarbage();
-
-      CHECK_EQ(2, CountArrayBuffersInWeakList(isolate->heap()) - start);
-
-      {
-        v8::HandleScope s2(context->GetIsolate());
-        for (int j = 1; j <= 3; j++) {
-          if (j == i) continue;
-          i::SNPrintF(source, "ab%d", j);
-          v8::Handle<v8::ArrayBuffer> ab =
-              v8::Handle<v8::ArrayBuffer>::Cast(CompileRun(source.start()));
-          CHECK(HasArrayBufferInWeakList(isolate->heap(),
-                *v8::Utils::OpenHandle(*ab)));
-          }
-      }
-
-      CompileRun("ab1 = null; ab2 = null; ab3 = null;");
-    }
-
-    isolate->heap()->CollectAllGarbage();
-    CHECK_EQ(start, CountArrayBuffersInWeakList(isolate->heap()));
-  }
-}