V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
builtins-constructor.h
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 
17  public:
18  static int MaximumFunctionContextSlots() {
19  return FLAG_test_small_max_function_context_stub_size ? kSmallMaximumSlots
20  : 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_
Definition: libplatform.h:13