Serializer: micro-optimizations for the deserializer.

src/serialize.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 490 matching lines @@
   NameMap address_to_name_map_;
   Isolate* isolate_;
 };
 
 
 void Deserializer::DecodeReservation(
     Vector<const SerializedData::Reservation> res) {
   DCHECK_EQ(0, reservations_[NEW_SPACE].length());
   STATIC_ASSERT(NEW_SPACE == 0);
   int current_space = NEW_SPACE;
-  for (int i = 0; i < res.length(); i++) {
-    SerializedData::Reservation r(0);
-    memcpy(&r, res.start() + i, sizeof(r));
+  for (auto& r : res) {
     reservations_[current_space].Add({r.chunk_size(), NULL, NULL});
     if (r.is_last()) current_space++;
   }
   DCHECK_EQ(kNumberOfSpaces, current_space);
   for (int i = 0; i < kNumberOfPreallocatedSpaces; i++) current_chunk_[i] = 0;
 }
 
 
 void Deserializer::FlushICacheForNewCodeObjects() {
   PageIterator it(isolate_->heap()->code_space());
@@ skipping 2038 matching lines @@
   DisallowHeapAllocation no_gc;
   SerializedCodeData* scd = new SerializedCodeData(cached_data);
   SanityCheckResult r = scd->SanityCheck(isolate, source);
   if (r == CHECK_SUCCESS) return scd;
   cached_data->Reject();
   source->GetIsolate()->counters()->code_cache_reject_reason()->AddSample(r);
   delete scd;
   return NULL;
 }
 } }  // namespace v8::internal