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[GR-38180] Encode analysis graphs to reduce memory footprint of the i…
…mage generator. PullRequest: graal/11629
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154 changes: 154 additions & 0 deletions
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sdk/src/org.graalvm.collections/src/org/graalvm/collections/EmptyMap.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| /* | ||
| * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved. | ||
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| * | ||
| * The Universal Permissive License (UPL), Version 1.0 | ||
| * | ||
| * Subject to the condition set forth below, permission is hereby granted to any | ||
| * person obtaining a copy of this software, associated documentation and/or | ||
| * data (collectively the "Software"), free of charge and under any and all | ||
| * copyright rights in the Software, and any and all patent rights owned or | ||
| * freely licensable by each licensor hereunder covering either (i) the | ||
| * unmodified Software as contributed to or provided by such licensor, or (ii) | ||
| * the Larger Works (as defined below), to deal in both | ||
| * | ||
| * (a) the Software, and | ||
| * | ||
| * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if | ||
| * one is included with the Software each a "Larger Work" to which the Software | ||
| * is contributed by such licensors), | ||
| * | ||
| * without restriction, including without limitation the rights to copy, create | ||
| * derivative works of, display, perform, and distribute the Software and make, | ||
| * use, sell, offer for sale, import, export, have made, and have sold the | ||
| * Software and the Larger Work(s), and to sublicense the foregoing rights on | ||
| * either these or other terms. | ||
| * | ||
| * This license is subject to the following condition: | ||
| * | ||
| * The above copyright notice and either this complete permission notice or at a | ||
| * minimum a reference to the UPL must be included in all copies or substantial | ||
| * portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| * SOFTWARE. | ||
| */ | ||
| package org.graalvm.collections; | ||
|
|
||
| import java.util.Iterator; | ||
| import java.util.NoSuchElementException; | ||
| import java.util.function.BiFunction; | ||
|
|
||
| /** | ||
| * Singleton instances for empty maps and the corresponding iterators and cursors. | ||
| */ | ||
| class EmptyMap { | ||
|
|
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| static final MapCursor<Object, Object> EMPTY_CURSOR = new MapCursor<>() { | ||
| @Override | ||
| public void remove() { | ||
| throw new NoSuchElementException("Empty cursor does not have elements"); | ||
| } | ||
|
|
||
| @Override | ||
| public boolean advance() { | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public Object getKey() { | ||
| throw new NoSuchElementException("Empty cursor does not have elements"); | ||
| } | ||
|
|
||
| @Override | ||
| public Object getValue() { | ||
| throw new NoSuchElementException("Empty cursor does not have elements"); | ||
| } | ||
|
|
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| @Override | ||
| public Object setValue(Object newValue) { | ||
| throw new NoSuchElementException("Empty cursor does not have elements"); | ||
| } | ||
| }; | ||
|
|
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| static final Iterator<Object> EMPTY_ITERATOR = new Iterator<>() { | ||
| @Override | ||
| public boolean hasNext() { | ||
| return false; | ||
| } | ||
|
|
||
| @Override | ||
| public Object next() { | ||
| throw new NoSuchElementException("Empty iterator does not have elements"); | ||
| } | ||
| }; | ||
|
|
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| static final Iterable<Object> EMPTY_ITERABLE = new Iterable<>() { | ||
| @Override | ||
| public Iterator<Object> iterator() { | ||
| return EMPTY_ITERATOR; | ||
| } | ||
| }; | ||
|
|
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| static final EconomicMap<Object, Object> EMPTY_MAP = new EconomicMap<>() { | ||
| @Override | ||
| public Object put(Object key, Object value) { | ||
| throw new IllegalArgumentException("Cannot modify the always-empty map"); | ||
| } | ||
|
|
||
| @Override | ||
| public void clear() { | ||
| throw new IllegalArgumentException("Cannot modify the always-empty map"); | ||
| } | ||
|
|
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| @Override | ||
| public Object removeKey(Object key) { | ||
| throw new IllegalArgumentException("Cannot modify the always-empty map"); | ||
| } | ||
|
|
||
| @Override | ||
| public Object get(Object key) { | ||
| return null; | ||
| } | ||
|
|
||
| @Override | ||
| public boolean containsKey(Object key) { | ||
| return false; | ||
| } | ||
|
|
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| @Override | ||
| public int size() { | ||
| return 0; | ||
| } | ||
|
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| @Override | ||
| public boolean isEmpty() { | ||
| return true; | ||
| } | ||
|
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| @Override | ||
| public Iterable<Object> getValues() { | ||
| return EMPTY_ITERABLE; | ||
| } | ||
|
|
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| @Override | ||
| public Iterable<Object> getKeys() { | ||
| return EMPTY_ITERABLE; | ||
| } | ||
|
|
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| @Override | ||
| public MapCursor<Object, Object> getEntries() { | ||
| return EMPTY_CURSOR; | ||
| } | ||
|
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| @Override | ||
| public void replaceAll(BiFunction<? super Object, ? super Object, ?> function) { | ||
| throw new IllegalArgumentException("Cannot modify the always-empty map"); | ||
| } | ||
| }; | ||
| } |
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