Minimize malloc heap allocation on process startup.

test/cctest/test-spaces.cc

 // Copyright 2006-2008 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 73 matching lines @@
   CHECK(p->OffsetToAddress(Page::kObjectStartOffset) == p->ObjectAreaStart());
   CHECK(p->OffsetToAddress(Page::kPageSize) == p->ObjectAreaEnd());
 
   // test region marking
   VerifyRegionMarking(page_start);
 
   DeleteArray(mem);
 }
 
 
+namespace v8 {
+namespace internal {
+
+// Temporarily sets a given allocator in an isolate.
+class TestMemoryAllocatorScope {
+ public:
+  TestMemoryAllocatorScope(Isolate* isolate, MemoryAllocator* allocator)
+      : isolate_(isolate),
+        old_allocator_(isolate->memory_allocator_) {
+    isolate->memory_allocator_ = allocator;
+  }
+
+  ~TestMemoryAllocatorScope() {
+    isolate_->memory_allocator_ = old_allocator_;
+  }
+
+ private:
+  Isolate* isolate_;
+  MemoryAllocator* old_allocator_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestMemoryAllocatorScope);
+};
+
+} }  // namespace v8::internal
+
+
 TEST(MemoryAllocator) {
   OS::Setup();
   Isolate* isolate = Isolate::Current();
-  CHECK(HEAP->ConfigureHeapDefault());
-  CHECK(isolate->memory_allocator()->Setup(HEAP->MaxReserved(),
-                                           HEAP->MaxExecutableSize()));
+  isolate->InitializeLoggingAndCounters();
+  Heap* heap = isolate->heap();
+  CHECK(heap->ConfigureHeapDefault());
+  MemoryAllocator* memory_allocator = new MemoryAllocator(isolate);
+  CHECK(memory_allocator->Setup(heap->MaxReserved(),
+                                heap->MaxExecutableSize()));
+  TestMemoryAllocatorScope test_scope(isolate, memory_allocator);
 
-  OldSpace faked_space(HEAP,
-                       HEAP->MaxReserved(),
+  OldSpace faked_space(heap,
+                       heap->MaxReserved(),
                        OLD_POINTER_SPACE,
                        NOT_EXECUTABLE);
   int total_pages = 0;
   int requested = MemoryAllocator::kPagesPerChunk;
   int allocated;
   // If we request n pages, we should get n or n - 1.
-  Page* first_page =
-      isolate->memory_allocator()->AllocatePages(
-          requested, &allocated, &faked_space);
+  Page* first_page = memory_allocator->AllocatePages(
+      requested, &allocated, &faked_space);
   CHECK(first_page->is_valid());
   CHECK(allocated == requested || allocated == requested - 1);
   total_pages += allocated;
 
   Page* last_page = first_page;
   for (Page* p = first_page; p->is_valid(); p = p->next_page()) {
-    CHECK(isolate->memory_allocator()->IsPageInSpace(p, &faked_space));
+    CHECK(memory_allocator->IsPageInSpace(p, &faked_space));
     last_page = p;
   }
 
   // Again, we should get n or n - 1 pages.
-  Page* others =
-      isolate->memory_allocator()->AllocatePages(
-          requested, &allocated, &faked_space);
+  Page* others = memory_allocator->AllocatePages(
+      requested, &allocated, &faked_space);
   CHECK(others->is_valid());
   CHECK(allocated == requested || allocated == requested - 1);
   total_pages += allocated;
 
-  isolate->memory_allocator()->SetNextPage(last_page, others);
+  memory_allocator->SetNextPage(last_page, others);
   int page_count = 0;
   for (Page* p = first_page; p->is_valid(); p = p->next_page()) {
-    CHECK(isolate->memory_allocator()->IsPageInSpace(p, &faked_space));
+    CHECK(memory_allocator->IsPageInSpace(p, &faked_space));
     page_count++;
   }
   CHECK(total_pages == page_count);
 
   Page* second_page = first_page->next_page();
   CHECK(second_page->is_valid());
 
   // Freeing pages at the first chunk starting at or after the second page
   // should free the entire second chunk.  It will return the page it was passed
   // (since the second page was in the first chunk).
-  Page* free_return = isolate->memory_allocator()->FreePages(second_page);
+  Page* free_return = memory_allocator->FreePages(second_page);
   CHECK(free_return == second_page);
-  isolate->memory_allocator()->SetNextPage(first_page, free_return);
+  memory_allocator->SetNextPage(first_page, free_return);
 
   // Freeing pages in the first chunk starting at the first page should free
   // the first chunk and return an invalid page.
-  Page* invalid_page = isolate->memory_allocator()->FreePages(first_page);
+  Page* invalid_page = memory_allocator->FreePages(first_page);
   CHECK(!invalid_page->is_valid());
 
-  isolate->memory_allocator()->TearDown();
+  memory_allocator->TearDown();
+  delete memory_allocator;
 }
 
 
 TEST(NewSpace) {
   OS::Setup();
-  CHECK(HEAP->ConfigureHeapDefault());
-  CHECK(Isolate::Current()->memory_allocator()->Setup(
-      HEAP->MaxReserved(), HEAP->MaxExecutableSize()));
+  Isolate* isolate = Isolate::Current();
+  isolate->InitializeLoggingAndCounters();
+  Heap* heap = isolate->heap();
+  CHECK(heap->ConfigureHeapDefault());
+  MemoryAllocator* memory_allocator = new MemoryAllocator(isolate);
+  CHECK(memory_allocator->Setup(heap->MaxReserved(),
+                                heap->MaxExecutableSize()));
+  TestMemoryAllocatorScope test_scope(isolate, memory_allocator);
 
-  NewSpace new_space(HEAP);
+  NewSpace new_space(heap);
 
   void* chunk =
-      Isolate::Current()->memory_allocator()->ReserveInitialChunk(
-          4 * HEAP->ReservedSemiSpaceSize());
+      memory_allocator->ReserveInitialChunk(4 * heap->ReservedSemiSpaceSize());
   CHECK(chunk != NULL);
   Address start = RoundUp(static_cast<Address>(chunk),
-                          2 * HEAP->ReservedSemiSpaceSize());
-  CHECK(new_space.Setup(start, 2 * HEAP->ReservedSemiSpaceSize()));
+                          2 * heap->ReservedSemiSpaceSize());
+  CHECK(new_space.Setup(start, 2 * heap->ReservedSemiSpaceSize()));
   CHECK(new_space.HasBeenSetup());
 
   while (new_space.Available() >= Page::kMaxHeapObjectSize) {
     Object* obj =
         new_space.AllocateRaw(Page::kMaxHeapObjectSize)->ToObjectUnchecked();
     CHECK(new_space.Contains(HeapObject::cast(obj)));
   }
 
   new_space.TearDown();
-  Isolate::Current()->memory_allocator()->TearDown();
+  memory_allocator->TearDown();
+  delete memory_allocator;
 }
 
 
 TEST(OldSpace) {
   OS::Setup();
-  CHECK(HEAP->ConfigureHeapDefault());
-  CHECK(Isolate::Current()->memory_allocator()->Setup(
-      HEAP->MaxReserved(), HEAP->MaxExecutableSize()));
+  Isolate* isolate = Isolate::Current();
+  isolate->InitializeLoggingAndCounters();
+  Heap* heap = isolate->heap();
+  CHECK(heap->ConfigureHeapDefault());
+  MemoryAllocator* memory_allocator = new MemoryAllocator(isolate);
+  CHECK(memory_allocator->Setup(heap->MaxReserved(),
+                                heap->MaxExecutableSize()));
+  TestMemoryAllocatorScope test_scope(isolate, memory_allocator);
 
-  OldSpace* s = new OldSpace(HEAP,
-                             HEAP->MaxOldGenerationSize(),
+  OldSpace* s = new OldSpace(heap,
+                             heap->MaxOldGenerationSize(),
                              OLD_POINTER_SPACE,
                              NOT_EXECUTABLE);
   CHECK(s != NULL);
 
-  void* chunk =
-      Isolate::Current()->memory_allocator()->ReserveInitialChunk(
-          4 * HEAP->ReservedSemiSpaceSize());
+  void* chunk = memory_allocator->ReserveInitialChunk(
+      4 * heap->ReservedSemiSpaceSize());
   CHECK(chunk != NULL);
   Address start = static_cast<Address>(chunk);
-  size_t size = RoundUp(start, 2 * HEAP->ReservedSemiSpaceSize()) - start;
+  size_t size = RoundUp(start, 2 * heap->ReservedSemiSpaceSize()) - start;
 
   CHECK(s->Setup(start, size));
 
   while (s->Available() > 0) {
     s->AllocateRaw(Page::kMaxHeapObjectSize)->ToObjectUnchecked();
   }
 
   s->TearDown();
   delete s;
-  Isolate::Current()->memory_allocator()->TearDown();
+  memory_allocator->TearDown();
+  delete memory_allocator;
 }
 
 
 TEST(LargeObjectSpace) {
-  OS::Setup();
-  CHECK(HEAP->Setup(false));
+  v8::V8::Initialize();
 
   LargeObjectSpace* lo = HEAP->lo_space();
   CHECK(lo != NULL);
 
   Map* faked_map = reinterpret_cast<Map*>(HeapObject::FromAddress(0));
   int lo_size = Page::kPageSize;
 
   Object* obj = lo->AllocateRaw(lo_size)->ToObjectUnchecked();
   CHECK(obj->IsHeapObject());
 
@@ skipping 11 matching lines @@
     { MaybeObject* maybe_obj = lo->AllocateRaw(lo_size);
       if (!maybe_obj->ToObject(&obj)) break;
     }
     HeapObject::cast(obj)->set_map(faked_map);
     CHECK(lo->Available() < available);
   };
 
   CHECK(!lo->IsEmpty());
 
   CHECK(lo->AllocateRaw(lo_size)->IsFailure());
-
-  lo->TearDown();
-  delete lo;
-
-  Isolate::Current()->memory_allocator()->TearDown();
 }