Reimplement Maps and Sets in JS

src/macros.py

 # Copyright 2006-2009 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
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 const PROPERTY_ATTRIBUTES_NONE = 0;
 const PROPERTY_ATTRIBUTES_STRING = 8;
 const PROPERTY_ATTRIBUTES_SYMBOLIC = 16;
 const PROPERTY_ATTRIBUTES_PRIVATE_SYMBOL = 32;
 
 # Use for keys, values and entries iterators.
 const ITERATOR_KIND_KEYS = 1;
 const ITERATOR_KIND_VALUES = 2;
 const ITERATOR_KIND_ENTRIES = 3;
 
+# Needs prefixing
+const NUMBER_OF_BUCKETS_INDEX = 0;
+const NUMBER_OF_ELEMENTS_INDEX = 1;
+const NUMBER_OF_DELETED_ELEMENTS_INDEX = 2;
+const HASH_TABLE_START_INDEX = 3;
+const NOT_FOUND = -1;
+# For sets
+const SET_CHAIN_OFFSET = 1;
+const MAP_CHAIN_OFFSET = 2;
+
+macro SET_ENTRY_TO_INDEX(entry, numBuckets) = (3 + numBuckets + (entry << 1));
+macro SET_KEY_AT(table, entry, numBuckets) = (%_FixedArrayGet(table, SET_ENTRY_TO_INDEX(entry, numBuckets)));
+macro SET_CHAIN_AT(table, entry, numBuckets) = (%_FixedArrayGet(table, SET_ENTRY_TO_INDEX(entry, numBuckets) + 1));
+
+# TODO(adamk): Need to make multiplications not create HeapNumbers
+macro MAP_ENTRY_TO_INDEX(entry, numBuckets) = (3 + numBuckets + ((entry * 3) | 0));
+macro MAP_KEY_AT(table, entry, numBuckets) = (%_FixedArrayGet(table, MAP_ENTRY_TO_INDEX(entry, numBuckets)));
+macro MAP_VALUE_AT(table, entry, numBuckets) = (%_FixedArrayGet(table, MAP_ENTRY_TO_INDEX(entry, numBuckets) + 1));
+macro MAP_CHAIN_AT(table, entry, numBuckets) = (%_FixedArrayGet(table, MAP_ENTRY_TO_INDEX(entry, numBuckets) + 2));
+
 # Check whether debug is active.
 const DEBUG_IS_ACTIVE = (%_DebugIsActive() != 0);
 macro DEBUG_IS_STEPPING(function) = (%_DebugIsActive() != 0 && %DebugCallbackSupportsStepping(function));
 macro DEBUG_PREPARE_STEP_IN_IF_STEPPING(function) = if (DEBUG_IS_STEPPING(function)) %DebugPrepareStepInIfStepping(function);