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-rw-r--r--src/jdk/nashorn/internal/ir/SwitchNode.java246
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diff --git a/src/jdk/nashorn/internal/ir/SwitchNode.java b/src/jdk/nashorn/internal/ir/SwitchNode.java
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--- a/src/jdk/nashorn/internal/ir/SwitchNode.java
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-/*
- * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-package jdk.nashorn.internal.ir;
-
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import jdk.nashorn.internal.codegen.Label;
-import jdk.nashorn.internal.ir.annotations.Immutable;
-import jdk.nashorn.internal.ir.visitor.NodeVisitor;
-
-/**
- * IR representation of a SWITCH statement.
- */
-@Immutable
-public final class SwitchNode extends BreakableStatement {
- private static final long serialVersionUID = 1L;
-
- /** Switch expression. */
- private final Expression expression;
-
- /** Switch cases. */
- private final List<CaseNode> cases;
-
- /** Switch default index. */
- private final int defaultCaseIndex;
-
- /** True if all cases are 32-bit signed integer constants, without repetitions. It's a prerequisite for
- * using a tableswitch/lookupswitch when generating code. */
- private final boolean uniqueInteger;
-
- /** Tag symbol. */
- private final Symbol tag;
-
- /**
- * Constructor
- *
- * @param lineNumber lineNumber
- * @param token token
- * @param finish finish
- * @param expression switch expression
- * @param cases cases
- * @param defaultCase the default case node - null if none, otherwise has to be present in cases list
- */
- public SwitchNode(final int lineNumber, final long token, final int finish, final Expression expression, final List<CaseNode> cases, final CaseNode defaultCase) {
- super(lineNumber, token, finish, new Label("switch_break"));
- this.expression = expression;
- this.cases = cases;
- this.defaultCaseIndex = defaultCase == null ? -1 : cases.indexOf(defaultCase);
- this.uniqueInteger = false;
- this.tag = null;
- }
-
- private SwitchNode(final SwitchNode switchNode, final Expression expression, final List<CaseNode> cases,
- final int defaultCaseIndex, final LocalVariableConversion conversion, final boolean uniqueInteger, final Symbol tag) {
- super(switchNode, conversion);
- this.expression = expression;
- this.cases = cases;
- this.defaultCaseIndex = defaultCaseIndex;
- this.tag = tag;
- this.uniqueInteger = uniqueInteger;
- }
-
- @Override
- public Node ensureUniqueLabels(final LexicalContext lc) {
- final List<CaseNode> newCases = new ArrayList<>();
- for (final CaseNode caseNode : cases) {
- newCases.add(new CaseNode(caseNode, caseNode.getTest(), caseNode.getBody(), caseNode.getLocalVariableConversion()));
- }
- return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, newCases, defaultCaseIndex, conversion, uniqueInteger, tag));
- }
-
- @Override
- public boolean isTerminal() {
- //there must be a default case, and that including all other cases must terminate
- if (!cases.isEmpty() && defaultCaseIndex != -1) {
- for (final CaseNode caseNode : cases) {
- if (!caseNode.isTerminal()) {
- return false;
- }
- }
- return true;
- }
- return false;
-
- }
-
- @Override
- public Node accept(final LexicalContext lc, final NodeVisitor<? extends LexicalContext> visitor) {
- if (visitor.enterSwitchNode(this)) {
- return visitor.leaveSwitchNode(
- setExpression(lc, (Expression)expression.accept(visitor)).
- setCases(lc, Node.accept(visitor, cases), defaultCaseIndex));
- }
-
- return this;
- }
-
- @Override
- public void toString(final StringBuilder sb, final boolean printType) {
- sb.append("switch (");
- expression.toString(sb, printType);
- sb.append(')');
- }
-
- /**
- * Return the case node that is default case
- * @return default case or null if none
- */
- public CaseNode getDefaultCase() {
- return defaultCaseIndex == -1 ? null : cases.get(defaultCaseIndex);
- }
-
- /**
- * Get the cases in this switch
- * @return a list of case nodes
- */
- public List<CaseNode> getCases() {
- return Collections.unmodifiableList(cases);
- }
-
- /**
- * Replace case nodes with new list. the cases have to be the same
- * and the default case index the same. This is typically used
- * by NodeVisitors who perform operations on every case node
- * @param lc lexical context
- * @param cases list of cases
- * @return new switch node or same if no state was changed
- */
- public SwitchNode setCases(final LexicalContext lc, final List<CaseNode> cases) {
- return setCases(lc, cases, defaultCaseIndex);
- }
-
- private SwitchNode setCases(final LexicalContext lc, final List<CaseNode> cases, final int defaultCaseIndex) {
- if (this.cases == cases) {
- return this;
- }
- return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, cases, defaultCaseIndex, conversion, uniqueInteger, tag));
- }
-
- /**
- * Set or reset the list of cases in this switch
- * @param lc lexical context
- * @param cases a list of cases, case nodes
- * @param defaultCase a case in the list that is the default - must be in the list or class will assert
- * @return new switch node or same if no state was changed
- */
- public SwitchNode setCases(final LexicalContext lc, final List<CaseNode> cases, final CaseNode defaultCase) {
- return setCases(lc, cases, defaultCase == null ? -1 : cases.indexOf(defaultCase));
- }
-
- /**
- * Return the expression to switch on
- * @return switch expression
- */
- public Expression getExpression() {
- return expression;
- }
-
- /**
- * Set or reset the expression to switch on
- * @param lc lexical context
- * @param expression switch expression
- * @return new switch node or same if no state was changed
- */
- public SwitchNode setExpression(final LexicalContext lc, final Expression expression) {
- if (this.expression == expression) {
- return this;
- }
- return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, cases, defaultCaseIndex, conversion, uniqueInteger, tag));
- }
-
- /**
- * Get the tag symbol for this switch. The tag symbol is where
- * the switch expression result is stored
- * @return tag symbol
- */
- public Symbol getTag() {
- return tag;
- }
-
- /**
- * Set the tag symbol for this switch. The tag symbol is where
- * the switch expression result is stored
- * @param lc lexical context
- * @param tag a symbol
- * @return a switch node with the symbol set
- */
- public SwitchNode setTag(final LexicalContext lc, final Symbol tag) {
- if (this.tag == tag) {
- return this;
- }
- return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, cases, defaultCaseIndex, conversion, uniqueInteger, tag));
- }
-
- /**
- * Returns true if all cases of this switch statement are 32-bit signed integer constants, without repetitions.
- * @return true if all cases of this switch statement are 32-bit signed integer constants, without repetitions.
- */
- public boolean isUniqueInteger() {
- return uniqueInteger;
- }
-
- /**
- * Sets whether all cases of this switch statement are 32-bit signed integer constants, without repetitions.
- * @param lc lexical context
- * @param uniqueInteger if true, all cases of this switch statement have been determined to be 32-bit signed
- * integer constants, without repetitions.
- * @return this switch node, if the value didn't change, or a new switch node with the changed value
- */
- public SwitchNode setUniqueInteger(final LexicalContext lc, final boolean uniqueInteger) {
- if(this.uniqueInteger == uniqueInteger) {
- return this;
- }
- return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, cases, defaultCaseIndex, conversion, uniqueInteger, tag));
- }
-
- @Override
- JoinPredecessor setLocalVariableConversionChanged(final LexicalContext lc, final LocalVariableConversion conversion) {
- return Node.replaceInLexicalContext(lc, this, new SwitchNode(this, expression, cases, defaultCaseIndex, conversion, uniqueInteger, tag));
- }
-
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-28 06:16:31 +0000