Line data    Source code

       1             : // Copyright 2016 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_BUILTINS_BUILTINS_CONSTRUCTOR_H_
       6             : #define V8_BUILTINS_BUILTINS_CONSTRUCTOR_H_
       7             : 
       8             : #include "src/contexts.h"
       9             : #include "src/objects.h"
      10             : #include "src/objects/dictionary.h"
      11             : #include "src/objects/js-array.h"
      12             : 
      13             : namespace v8 {
      14             : namespace internal {
      15             : 
      16             : class ConstructorBuiltins {
      17             :  public:
      18             :   static int MaximumFunctionContextSlots() {
      19             :     return FLAG_test_small_max_function_context_stub_size ? kSmallMaximumSlots
      20      182685 :                                                           : kMaximumSlots;
      21             :   }
      22             : 
      23             :   // Maximum number of elements in copied array (chosen so that even an array
      24             :   // backed by a double backing store will fit into new-space).
      25             :   static const int kMaximumClonedShallowArrayElements =
      26             :       JSArray::kInitialMaxFastElementArray;
      27             :   // Maximum number of properties in copied object so that the properties store
      28             :   // will fit into new-space. This constant is based on the assumption that
      29             :   // NameDictionaries are 50% over-allocated.
      30             :   static const int kMaximumClonedShallowObjectProperties =
      31             :       NameDictionary::kMaxRegularCapacity / 3 * 2;
      32             : 
      33             :  private:
      34             :   static const int kMaximumSlots =
      35             :       (kMaxRegularHeapObjectSize - Context::kTodoHeaderSize) / kTaggedSize - 1;
      36             :   static const int kSmallMaximumSlots = 10;
      37             : 
      38             :   // FastNewFunctionContext can only allocate closures which fit in the
      39             :   // new space.
      40             :   STATIC_ASSERT(Context::SizeFor(kMaximumSlots + Context::MIN_CONTEXT_SLOTS) <
      41             :                 kMaxRegularHeapObjectSize);
      42             : };
      43             : 
      44             : }  // namespace internal
      45             : }  // namespace v8
      46             : 
      47             : #endif  // V8_BUILTINS_BUILTINS_CONSTRUCTOR_H_