Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/src/hashmap.h b/src/hashmap.h
new file mode 100644
index 0000000..b92c715
--- /dev/null
+++ b/src/hashmap.h
@@ -0,0 +1,120 @@
+// Copyright 2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_HASHMAP_H_
+#define V8_HASHMAP_H_
+
+namespace v8 {
+namespace internal {
+
+
+// Allocator defines the memory allocator interface
+// used by HashMap and implements a default allocator.
+class Allocator BASE_EMBEDDED {
+ public:
+ virtual ~Allocator() {}
+ virtual void* New(size_t size) { return Malloced::New(size); }
+ virtual void Delete(void* p) { Malloced::Delete(p); }
+};
+
+
+class HashMap {
+ public:
+ static Allocator DefaultAllocator;
+
+ typedef bool (*MatchFun) (void* key1, void* key2);
+
+ // Dummy constructor. This constructor doesn't set up the hash
+ // map properly so don't use it unless you have good reason.
+ HashMap();
+
+ // initial_capacity is the size of the initial hash map;
+ // it must be a power of 2 (and thus must not be 0).
+ HashMap(MatchFun match,
+ Allocator* allocator = &DefaultAllocator,
+ uint32_t initial_capacity = 8);
+
+ ~HashMap();
+
+ // HashMap entries are (key, value, hash) triplets.
+ // Some clients may not need to use the value slot
+ // (e.g. implementers of sets, where the key is the value).
+ struct Entry {
+ void* key;
+ void* value;
+ uint32_t hash; // the full hash value for key
+ };
+
+ // If an entry with matching key is found, Lookup()
+ // returns that entry. If no matching entry is found,
+ // but insert is set, a new entry is inserted with
+ // corresponding key, key hash, and NULL value.
+ // Otherwise, NULL is returned.
+ Entry* Lookup(void* key, uint32_t hash, bool insert);
+
+ // Removes the entry with matching key.
+ void Remove(void* key, uint32_t hash);
+
+ // Empties the hash map (occupancy() == 0).
+ void Clear();
+
+ // The number of (non-empty) entries in the table.
+ uint32_t occupancy() const { return occupancy_; }
+
+ // The capacity of the table. The implementation
+ // makes sure that occupancy is at most 80% of
+ // the table capacity.
+ uint32_t capacity() const { return capacity_; }
+
+ // Iteration
+ //
+ // for (Entry* p = map.Start(); p != NULL; p = map.Next(p)) {
+ // ...
+ // }
+ //
+ // If entries are inserted during iteration, the effect of
+ // calling Next() is undefined.
+ Entry* Start() const;
+ Entry* Next(Entry* p) const;
+
+ private:
+ Allocator* allocator_;
+ MatchFun match_;
+ Entry* map_;
+ uint32_t capacity_;
+ uint32_t occupancy_;
+
+ Entry* map_end() const { return map_ + capacity_; }
+ Entry* Probe(void* key, uint32_t hash);
+ void Initialize(uint32_t capacity);
+ void Resize();
+};
+
+
+} } // namespace v8::internal
+
+#endif // V8_HASHMAP_H_