Make PrototypeTransitionClearing work with GC interval.

test/cctest/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "compilation-cache.h"
 #include "execution.h"
 #include "factory.h"
 #include "macro-assembler.h"
@@ skipping 1763 matching lines @@
     v8::Handle<v8::Function> g =
         v8::Handle<v8::Function>::Cast(global->Get(v8_str("g")));
     g->Call(global, 0, NULL);
   }
 
   HEAP->incremental_marking()->set_should_hurry(true);
   HEAP->CollectGarbage(OLD_POINTER_SPACE);
 }
 
 
+// Implemented in the test-alloc.cc test suite.
+void SimulateFullSpace(PagedSpace* space);
+
+
 TEST(PrototypeTransitionClearing) {
   InitializeVM();
   v8::HandleScope scope;
 
   CompileRun(
       "var base = {};"
       "var live = [];"
       "for (var i = 0; i < 10; i++) {"
       "  var object = {};"
       "  var prototype = {};"
@@ skipping 18 matching lines @@
     int j = Map::kProtoTransitionHeaderSize +
         i * Map::kProtoTransitionElementsPerEntry;
     CHECK(trans->get(j + Map::kProtoTransitionMapOffset)->IsMap());
     Object* proto = trans->get(j + Map::kProtoTransitionPrototypeOffset);
     CHECK(proto->IsTheHole() || proto->IsJSObject());
   }
 
   // Make sure next prototype is placed on an old-space evacuation candidate.
   Handle<JSObject> prototype;
   PagedSpace* space = HEAP->old_pointer_space();
-  do {
+  {
+    AlwaysAllocateScope always_allocate;
+    SimulateFullSpace(space);
     prototype = FACTORY->NewJSArray(32 * KB, FAST_HOLEY_ELEMENTS, TENURED);
-  } while (space->FirstPage() == space->LastPage() ||
-      !space->LastPage()->Contains(prototype->address()));
+  }
 
   // Add a prototype on an evacuation candidate and verify that transition
   // clearing correctly records slots in prototype transition array.
   i::FLAG_always_compact = true;
   Handle<Map> map(baseObject->map());
   CHECK(!space->LastPage()->Contains(
       map->GetPrototypeTransitions()->address()));
   CHECK(space->LastPage()->Contains(prototype->address()));
   baseObject->SetPrototype(*prototype, false)->ToObjectChecked();
   CHECK(map->GetPrototypeTransition(*prototype)->IsMap());
@@ skipping 251 matching lines @@
       v8::Utils::OpenHandle(
           *v8::Handle<v8::Object>::Cast(
               v8::Context::GetCurrent()->Global()->Get(v8_str("root"))));
 
   // The root object should be in a sane state.
   CHECK(root->IsJSObject());
   CHECK(root->map()->IsMap());
 }
 
 
-// Implemented in the test-alloc.cc test suite.
-void SimulateFullSpace(PagedSpace* space);
-
-
 TEST(ReleaseOverReservedPages) {
   i::FLAG_trace_gc = true;
   // The optimizer can allocate stuff, messing up the test.
   i::FLAG_crankshaft = false;
   i::FLAG_always_opt = false;
   InitializeVM();
   v8::HandleScope scope;
   static const int number_of_test_pages = 20;
 
   // Prepare many pages with low live-bytes count.
@@ skipping 394 matching lines @@
   Handle<Object> call_function(call);
 
   // Now we are ready to mess up the heap.
   HEAP->CollectAllGarbage(Heap::kReduceMemoryFootprintMask);
 
   // Either heap verification caught the problem already or we go kaboom once
   // the CallIC is executed the next time.
   USE(global->SetProperty(*name, *call_function, NONE, kNonStrictMode));
   CompileRun("call();");
 }