Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/key-accumulator.h b/src/key-accumulator.h
new file mode 100644
index 0000000..8a4d886
--- /dev/null
+++ b/src/key-accumulator.h
@@ -0,0 +1,93 @@
+// 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_KEY_ACCUMULATOR_H_
+#define V8_KEY_ACCUMULATOR_H_
+
+#include "src/isolate.h"
+#include "src/objects.h"
+
+namespace v8 {
+namespace internal {
+
+enum AddKeyConversion { DO_NOT_CONVERT, CONVERT_TO_ARRAY_INDEX, PROXY_MAGIC };
+
+// This is a helper class for JSReceiver::GetKeys which collects and sorts keys.
+// GetKeys needs to sort keys per prototype level, first showing the integer
+// indices from elements then the strings from the properties. However, this
+// does not apply to proxies which are in full control of how the keys are
+// sorted.
+//
+// For performance reasons the KeyAccumulator internally separates integer keys
+// in |elements_| into sorted lists per prototype level. String keys are
+// collected in |string_properties_|, a single OrderedHashSet (similar for
+// Symbols in |symbol_properties_|. To separate the keys per level later when
+// assembling the final list, |levelLengths_| keeps track of the number of
+// String and Symbol keys per level.
+//
+// Only unique keys are kept by the KeyAccumulator, strings are stored in a
+// HashSet for inexpensive lookups. Integer keys are kept in sorted lists which
+// are more compact and allow for reasonably fast includes check.
+class KeyAccumulator final BASE_EMBEDDED {
+ public:
+ KeyAccumulator(Isolate* isolate, PropertyFilter filter)
+ : isolate_(isolate), filter_(filter) {}
+ ~KeyAccumulator();
+
+ bool AddKey(uint32_t key);
+ bool AddKey(Object* key, AddKeyConversion convert = DO_NOT_CONVERT);
+ bool AddKey(Handle<Object> key, AddKeyConversion convert = DO_NOT_CONVERT);
+ void AddKeys(Handle<FixedArray> array,
+ AddKeyConversion convert = DO_NOT_CONVERT);
+ void AddKeys(Handle<JSObject> array,
+ AddKeyConversion convert = DO_NOT_CONVERT);
+ void AddKeysFromProxy(Handle<JSObject> array);
+ Maybe<bool> AddKeysFromProxy(Handle<JSProxy> proxy, Handle<FixedArray> keys);
+ void AddElementKeysFromInterceptor(Handle<JSObject> array);
+ // Jump to the next level, pushing the current |levelLength_| to
+ // |levelLengths_| and adding a new list to |elements_|.
+ void NextPrototype();
+ // Sort the integer indices in the last list in |elements_|
+ void SortCurrentElementsList();
+ Handle<FixedArray> GetKeys(GetKeysConversion convert = KEEP_NUMBERS);
+ int length() { return length_; }
+ Isolate* isolate() { return isolate_; }
+
+ private:
+ bool AddIntegerKey(uint32_t key);
+ bool AddStringKey(Handle<Object> key, AddKeyConversion convert);
+ bool AddSymbolKey(Handle<Object> array);
+ void SortCurrentElementsListRemoveDuplicates();
+
+ Isolate* isolate_;
+ PropertyFilter filter_;
+ // |elements_| contains the sorted element keys (indices) per level.
+ std::vector<std::vector<uint32_t>*> elements_;
+ // |protoLengths_| contains the total number of keys (elements + properties)
+ // per level. Negative values mark counts for a level with keys from a proxy.
+ std::vector<int> level_lengths_;
+ // |string_properties_| contains the unique String property keys for all
+ // levels in insertion order per level.
+ Handle<OrderedHashSet> string_properties_;
+ // |symbol_properties_| contains the unique Symbol property keys for all
+ // levels in insertion order per level.
+ Handle<OrderedHashSet> symbol_properties_;
+ // |length_| keeps track of the total number of all element and property keys.
+ int length_ = 0;
+ // |levelLength_| keeps track of the number of String keys in the current
+ // level.
+ int level_string_length_ = 0;
+ // |levelSymbolLength_| keeps track of the number of Symbol keys in the
+ // current level.
+ int level_symbol_length_ = 0;
+
+ DISALLOW_COPY_AND_ASSIGN(KeyAccumulator);
+};
+
+
+} // namespace internal
+} // namespace v8
+
+
+#endif // V8_KEY_ACCUMULATOR_H_