Minimize malloc heap allocation on process startup.

test/cctest/test-heap.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 
 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "execution.h"
 #include "factory.h"
 #include "macro-assembler.h"
 #include "global-handles.h"
@@ skipping 273 matching lines @@
   InitializeVM();
 
   v8::HandleScope scope;
   const char* name = "Kasper the spunky";
   Handle<String> string = FACTORY->NewStringFromAscii(CStrVector(name));
   CHECK_EQ(StrLength(name), string->length());
 }
 
 
 TEST(GlobalHandles) {
+  InitializeVM();
   GlobalHandles* global_handles = Isolate::Current()->global_handles();
-  InitializeVM();
 
   Handle<Object> h1;
   Handle<Object> h2;
   Handle<Object> h3;
   Handle<Object> h4;
 
   {
     HandleScope scope;
 
     Handle<Object> i = FACTORY->NewStringFromAscii(CStrVector("fisk"));
@@ skipping 26 matching lines @@
 static bool WeakPointerCleared = false;
 
 static void TestWeakGlobalHandleCallback(v8::Persistent<v8::Value> handle,
                                          void* id) {
   if (1234 == reinterpret_cast<intptr_t>(id)) WeakPointerCleared = true;
   handle.Dispose();
 }
 
 
 TEST(WeakGlobalHandlesScavenge) {
+  InitializeVM();
   GlobalHandles* global_handles = Isolate::Current()->global_handles();
-  InitializeVM();
 
   WeakPointerCleared = false;
 
   Handle<Object> h1;
   Handle<Object> h2;
 
   {
     HandleScope scope;
 
     Handle<Object> i = FACTORY->NewStringFromAscii(CStrVector("fisk"));
@@ skipping 16 matching lines @@
   CHECK(!WeakPointerCleared);
   CHECK(!global_handles->IsNearDeath(h2.location()));
   CHECK(!global_handles->IsNearDeath(h1.location()));
 
   global_handles->Destroy(h1.location());
   global_handles->Destroy(h2.location());
 }
 
 
 TEST(WeakGlobalHandlesMark) {
+  InitializeVM();
   GlobalHandles* global_handles = Isolate::Current()->global_handles();
-  InitializeVM();
 
   WeakPointerCleared = false;
 
   Handle<Object> h1;
   Handle<Object> h2;
 
   {
     HandleScope scope;
 
     Handle<Object> i = FACTORY->NewStringFromAscii(CStrVector("fisk"));
@@ skipping 17 matching lines @@
 
   CHECK((*h1)->IsString());
 
   CHECK(WeakPointerCleared);
   CHECK(!GlobalHandles::IsNearDeath(h1.location()));
 
   global_handles->Destroy(h1.location());
 }
 
 TEST(DeleteWeakGlobalHandle) {
+  InitializeVM();
   GlobalHandles* global_handles = Isolate::Current()->global_handles();
-  InitializeVM();
 
   WeakPointerCleared = false;
 
   Handle<Object> h;
 
   {
     HandleScope scope;
 
     Handle<Object> i = FACTORY->NewStringFromAscii(CStrVector("fisk"));
     h = global_handles->Create(*i);
@@ skipping 889 matching lines @@
     CHECK(helper.b_found());
   }
   // ...but is now unreachable.
   {
     HeapIteratorTestHelper helper(a_saved, *b);
     helper.IterateHeap(HeapIterator::kFilterUnreachable);
     CHECK(!helper.a_found());
     CHECK(helper.b_found());
   }
 }