Serializer: reorder root list items.

src/heap/heap.h

 // 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 
 #include "src/allocation.h"
@@ skipping 20 matching lines @@
   V(Map, one_pointer_filler_map, OnePointerFillerMap)                          \
   V(Map, two_pointer_filler_map, TwoPointerFillerMap)                          \
   /* Cluster the most popular ones in a few cache lines here at the top.    */ \
   V(Smi, store_buffer_top, StoreBufferTop)                                     \
   V(Oddball, undefined_value, UndefinedValue)                                  \
   V(Oddball, the_hole_value, TheHoleValue)                                     \
   V(Oddball, null_value, NullValue)                                            \
   V(Oddball, true_value, TrueValue)                                            \
   V(Oddball, false_value, FalseValue)                                          \
   V(Oddball, uninitialized_value, UninitializedValue)                          \
-  V(Oddball, exception, Exception)                                             \
   V(Map, cell_map, CellMap)                                                    \
   V(Map, global_property_cell_map, GlobalPropertyCellMap)                      \
   V(Map, shared_function_info_map, SharedFunctionInfoMap)                      \
   V(Map, meta_map, MetaMap)                                                    \
   V(Map, heap_number_map, HeapNumberMap)                                       \
   V(Map, mutable_heap_number_map, MutableHeapNumberMap)                        \
   V(Map, native_context_map, NativeContextMap)                                 \
   V(Map, fixed_array_map, FixedArrayMap)                                       \
   V(Map, code_map, CodeMap)                                                    \
   V(Map, scope_info_map, ScopeInfoMap)                                         \
   V(Map, fixed_cow_array_map, FixedCOWArrayMap)                                \
   V(Map, fixed_double_array_map, FixedDoubleArrayMap)                          \
   V(Map, constant_pool_array_map, ConstantPoolArrayMap)                        \
   V(Map, weak_cell_map, WeakCellMap)                                           \
-  V(Oddball, no_interceptor_result_sentinel, NoInterceptorResultSentinel)      \
-  V(Map, hash_table_map, HashTableMap)                                         \
-  V(Map, ordered_hash_table_map, OrderedHashTableMap)                          \
+  V(Map, one_byte_string_map, OneByteStringMap)                                \
+  V(Map, one_byte_internalized_string_map, OneByteInternalizedStringMap)       \
+  V(Map, cons_one_byte_string_map, ConsOneByteStringMap)                       \

[Erik Corry, 2015/03/19 12:14:06]

If these are frequent in the snapshot perhaps we should be flattening strings
before generating the snapshot.

   V(FixedArray, empty_fixed_array, EmptyFixedArray)                            \
   V(ByteArray, empty_byte_array, EmptyByteArray)                               \
   V(DescriptorArray, empty_descriptor_array, EmptyDescriptorArray)             \
   V(ConstantPoolArray, empty_constant_pool_array, EmptyConstantPoolArray)      \
-  V(Oddball, arguments_marker, ArgumentsMarker)                                \
   /* The roots above this line should be boring from a GC point of view.    */ \
   /* This means they are never in new space and never on a page that is     */ \
   /* being compacted.                                                       */ \
+  V(Oddball, no_interceptor_result_sentinel, NoInterceptorResultSentinel)      \
+  V(Oddball, arguments_marker, ArgumentsMarker)                                \
+  V(Oddball, exception, Exception)                                             \
+  V(Oddball, termination_exception, TerminationException)                      \
   V(FixedArray, number_string_cache, NumberStringCache)                        \
   V(Object, instanceof_cache_function, InstanceofCacheFunction)                \
   V(Object, instanceof_cache_map, InstanceofCacheMap)                          \
   V(Object, instanceof_cache_answer, InstanceofCacheAnswer)                    \
   V(FixedArray, single_character_string_cache, SingleCharacterStringCache)     \
   V(FixedArray, string_split_cache, StringSplitCache)                          \
   V(FixedArray, regexp_multiple_cache, RegExpMultipleCache)                    \
-  V(Oddball, termination_exception, TerminationException)                      \
   V(Smi, hash_seed, HashSeed)                                                  \
+  V(Map, hash_table_map, HashTableMap)                                         \
+  V(Map, ordered_hash_table_map, OrderedHashTableMap)                          \
   V(Map, symbol_map, SymbolMap)                                                \
   V(Map, string_map, StringMap)                                                \
-  V(Map, one_byte_string_map, OneByteStringMap)                                \
   V(Map, cons_string_map, ConsStringMap)                                       \
-  V(Map, cons_one_byte_string_map, ConsOneByteStringMap)                       \
   V(Map, sliced_string_map, SlicedStringMap)                                   \
   V(Map, sliced_one_byte_string_map, SlicedOneByteStringMap)                   \
   V(Map, external_string_map, ExternalStringMap)                               \
   V(Map, external_string_with_one_byte_data_map,                               \
     ExternalStringWithOneByteDataMap)                                          \
   V(Map, external_one_byte_string_map, ExternalOneByteStringMap)               \
   V(Map, native_source_string_map, NativeSourceStringMap)                      \
   V(Map, short_external_string_map, ShortExternalStringMap)                    \
   V(Map, short_external_string_with_one_byte_data_map,                         \
     ShortExternalStringWithOneByteDataMap)                                     \
   V(Map, internalized_string_map, InternalizedStringMap)                       \
-  V(Map, one_byte_internalized_string_map, OneByteInternalizedStringMap)       \
   V(Map, external_internalized_string_map, ExternalInternalizedStringMap)      \
   V(Map, external_internalized_string_with_one_byte_data_map,                  \
     ExternalInternalizedStringWithOneByteDataMap)                              \
   V(Map, external_one_byte_internalized_string_map,                            \
     ExternalOneByteInternalizedStringMap)                                      \
   V(Map, short_external_internalized_string_map,                               \
     ShortExternalInternalizedStringMap)                                        \
   V(Map, short_external_internalized_string_with_one_byte_data_map,            \
     ShortExternalInternalizedStringWithOneByteDataMap)                         \
   V(Map, short_external_one_byte_internalized_string_map,                      \
@@ skipping 2490 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_