Retain maps embedded in optimized code for several garbage collections.

src/objects.cc

 // Copyright 2013 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 <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 8294 matching lines @@
     }
     casted_result->set_last_used_index(target_index - 1 - kFirstIndex);
     for (; target_index < result->length(); ++target_index) {
       result->set(target_index, Smi::FromInt(0));
     }
   }
   return casted_result;
 }
 
 
+Handle<ArrayList> ArrayList::Add(Handle<ArrayList> array, Handle<Object> obj) {
+  int length = array->Length();
+  array = EnsureSpace(array, length + 1);
+  array->Set(length, *obj);
+  array->SetLength(length + 1);
+  return array;
+}
+
+
+Handle<ArrayList> ArrayList::Add(Handle<ArrayList> array, Handle<Object> obj1,
+                                 Handle<Object> obj2) {
+  int length = array->Length();
+  array = EnsureSpace(array, length + 2);
+  array->Set(length, *obj1);
+  array->Set(length + 1, *obj2);
+  array->SetLength(length + 2);
+  return array;
+}
+
+
+Handle<ArrayList> ArrayList::EnsureSpace(Handle<ArrayList> array, int length) {
+  int capacity = array->length();
+  if (capacity < kFirstIndex + length) {
+    capacity = kFirstIndex + length;
+    capacity = capacity + Max(capacity / 2, 2);
+    array = Handle<ArrayList>::cast(FixedArray::CopySize(array, capacity));
+  }
+  return array;
+}
+
+
 Handle<DescriptorArray> DescriptorArray::Allocate(Isolate* isolate,
                                                   int number_of_descriptors,
                                                   int slack) {
   DCHECK(0 <= number_of_descriptors);
   Factory* factory = isolate->factory();
   // Do not use DescriptorArray::cast on incomplete object.
   int size = number_of_descriptors + slack;
   if (size == 0) return factory->empty_descriptor_array();
   // Allocate the array of keys.
   Handle<FixedArray> result = factory->NewFixedArray(LengthFor(size));
@@ skipping 8816 matching lines @@
                                                CompilationInfo* info) {
   Handle<DependentCode> codes = DependentCode::InsertCompilationInfo(
       handle(cell->dependent_code(), info->isolate()),
       DependentCode::kPropertyCellChangedGroup, info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal