[heap] Reland prepare code for smaller large object allocation limit than max allocatable memory.

test/cctest/test-weakmaps.cc

 // Copyright 2011 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
@@ skipping 170 matching lines @@
   Factory* factory = isolate->factory();
   Heap* heap = isolate->heap();
   HandleScope scope(isolate);
   Handle<JSFunction> function = factory->NewFunction(
       factory->function_string());
   Handle<JSObject> key = factory->NewJSObject(function);
   Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate);
 
   // Start second old-space page so that values land on evacuation candidate.
   Page* first_page = heap->old_space()->anchor()->next_page();
-  int dummy_array_size = Page::kMaxRegularHeapObjectSize - 92 * KB;
-  factory->NewFixedArray(dummy_array_size / kPointerSize, TENURED);
+  SimulateFullSpace(heap->old_space());
 
   // Fill up weak map with values on an evacuation candidate.
   {
     HandleScope scope(isolate);
     for (int i = 0; i < 32; i++) {
       Handle<JSObject> object = factory->NewJSObject(function, TENURED);
       CHECK(!heap->InNewSpace(object->address()));
       CHECK(!first_page->Contains(object->address()));
       int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
       JSWeakCollection::Set(weakmap, key, object, hash);
@@ skipping 18 matching lines @@
   LocalContext context;
   Isolate* isolate = GetIsolateFrom(&context);
   Factory* factory = isolate->factory();
   Heap* heap = isolate->heap();
   HandleScope scope(isolate);
   Handle<JSFunction> function = factory->NewFunction(
       factory->function_string());
 
   // Start second old-space page so that keys land on evacuation candidate.
   Page* first_page = heap->old_space()->anchor()->next_page();
-  int dummy_array_size = Page::kMaxRegularHeapObjectSize - 92 * KB;
-  factory->NewFixedArray(dummy_array_size / kPointerSize, TENURED);
+  SimulateFullSpace(heap->old_space());
 
   // Fill up weak map with keys on an evacuation candidate.
   Handle<JSObject> keys[32];
   for (int i = 0; i < 32; i++) {
     keys[i] = factory->NewJSObject(function, TENURED);
     CHECK(!heap->InNewSpace(keys[i]->address()));
     CHECK(!first_page->Contains(keys[i]->address()));
   }
   Handle<JSWeakMap> weakmap = AllocateJSWeakMap(isolate);
   for (int i = 0; i < 32; i++) {
@@ skipping 19 matching lines @@
   {
     HandleScope scope(isolate);
     AllocateJSWeakMap(isolate);
     SimulateIncrementalMarking(heap);
   }
   // The weak map is marked black here but leaving the handle scope will make
   // the object unreachable. Aborting incremental marking will clear all the
   // marking bits which makes the weak map garbage.
   heap->CollectAllGarbage();
 }