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package org.graalvm.compiler.virtual.phases.ea;

import java.util.Iterator;
import java.util.Map;

import jdk.internal.vm.compiler.collections.EconomicMap;
import jdk.internal.vm.compiler.collections.UnmodifiableMapCursor;

public abstract class EffectsBlockState<T extends EffectsBlockState<T>> {

    
This flag specifies whether this block is unreachable, which can happen during analysis if conditions turn constant or nodes canonicalize to cfg sinks.
/** * This flag specifies whether this block is unreachable, which can happen during analysis if * conditions turn constant or nodes canonicalize to cfg sinks. */
private boolean dead; public EffectsBlockState() { // emtpy } public EffectsBlockState(EffectsBlockState<T> other) { this.dead = other.dead; } @Override public String toString() { return ""; } protected abstract boolean equivalentTo(T other); public boolean isDead() { return dead; } public void markAsDead() { this.dead = true; }
Returns true if every value in subMap is also present in the superMap (according to "equals" semantics).
/** * Returns true if every value in subMap is also present in the superMap (according to "equals" * semantics). */
protected static <K, V> boolean isSubMapOf(EconomicMap<K, V> superMap, EconomicMap<K, V> subMap) { if (superMap == subMap) { return true; } UnmodifiableMapCursor<K, V> cursor = subMap.getEntries(); while (cursor.advance()) { K key = cursor.getKey(); V value = cursor.getValue(); assert value != null; V otherValue = superMap.get(key); if (otherValue != value && !value.equals(otherValue)) { return false; } } return true; }
Modifies target so that only entries that have corresponding entries in source remain.
/** * Modifies target so that only entries that have corresponding entries in source remain. */
protected static <U, V> void meetMaps(Map<U, V> target, Map<U, V> source) { Iterator<Map.Entry<U, V>> iter = target.entrySet().iterator(); while (iter.hasNext()) { Map.Entry<U, V> entry = iter.next(); if (source.containsKey(entry.getKey())) { assert source.get(entry.getKey()) == entry.getValue(); } else { iter.remove(); } } } }