Minimize malloc heap allocation on process startup.

src/spaces.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 130 matching lines @@
       stop_page_ = space->last_page_;
       break;
   }
 }
 
 
 // -----------------------------------------------------------------------------
 // CodeRange
 
 
-CodeRange::CodeRange()
-    : code_range_(NULL),
+CodeRange::CodeRange(Isolate* isolate)
+    : isolate_(isolate),
+      code_range_(NULL),
       free_list_(0),
       allocation_list_(0),
-      current_allocation_block_index_(0),
-      isolate_(NULL) {
+      current_allocation_block_index_(0) {
 }
 
 
 bool CodeRange::Setup(const size_t requested) {
   ASSERT(code_range_ == NULL);
 
   code_range_ = new VirtualMemory(requested);
   CHECK(code_range_ != NULL);
   if (!code_range_->IsReserved()) {
     delete code_range_;
@@ skipping 105 matching lines @@
 
 // -----------------------------------------------------------------------------
 // MemoryAllocator
 //
 
 // 270 is an estimate based on the static default heap size of a pair of 256K
 // semispaces and a 64M old generation.
 const int kEstimatedNumberOfChunks = 270;
 
 
-MemoryAllocator::MemoryAllocator()
-    : capacity_(0),
+MemoryAllocator::MemoryAllocator(Isolate* isolate)
+    : isolate_(isolate),
+      capacity_(0),
       capacity_executable_(0),
       size_(0),
       size_executable_(0),
       initial_chunk_(NULL),
       chunks_(kEstimatedNumberOfChunks),
       free_chunk_ids_(kEstimatedNumberOfChunks),
       max_nof_chunks_(0),
-      top_(0),
-      isolate_(NULL) {
+      top_(0) {
 }
 
 
 void MemoryAllocator::Push(int free_chunk_id) {
   ASSERT(max_nof_chunks_ > 0);
   ASSERT(top_ < max_nof_chunks_);
   free_chunk_ids_[top_++] = free_chunk_id;
 }
 
 
@@ skipping 2786 matching lines @@
   for (HeapObject* obj = obj_it.next(); obj != NULL; obj = obj_it.next()) {
     if (obj->IsCode()) {
       Code* code = Code::cast(obj);
       isolate->code_kind_statistics()[code->kind()] += code->Size();
     }
   }
 }
 #endif  // DEBUG
 
 } }  // namespace v8::internal