+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
package net.sourceforge.phpdt.internal.compiler.ast;
-import java.util.List;
+import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
+import net.sourceforge.phpdt.internal.compiler.codegen.Label;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
+import net.sourceforge.phpdt.internal.compiler.flow.LabelFlowContext;
+import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-/**
- * @author Matthieu Casanova
- */
public class LabeledStatement extends Statement {
- public String label;
-
- public Statement statement;
-
- public LabeledStatement(final String label,
- final Statement statement,
- final int sourceStart,
- final int sourceEnd) {
- super(sourceStart, sourceEnd);
- this.label = label;
- this.statement = statement;
- }
-
- /**
- * Return the object into String.
- * It should be overriden
- * @return a String
- */
- public String toString() {
- return label + statement.toString();
- }
-
- /**
- * Return the object into String.
- * @param tab how many tabs (not used here
- * @return a String
- */
- public String toString(final int tab) {
- return tabString(tab) + toString();
- }
-
- /**
- * Get the variables from outside (parameters, globals ...)
- */
- public void getOutsideVariable(final List list) {
- statement.getOutsideVariable(list);
- }
-
- /**
- * get the modified variables.
- */
- public void getModifiedVariable(final List list) {
- statement.getModifiedVariable(list);
- }
-
- /**
- * Get the variables used.
- */
- public void getUsedVariable(final List list) {
- statement.getUsedVariable(list);
- }
+ public Statement statement;
+
+ public char[] label;
+
+ public Label targetLabel;
+
+ // for local variables table attributes
+ int mergedInitStateIndex = -1;
+
+ /**
+ * LabeledStatement constructor comment.
+ */
+ public LabeledStatement(char[] l, Statement st, int s, int e) {
+
+ this.statement = st;
+ this.label = l;
+ this.sourceStart = s;
+ this.sourceEnd = e;
+ }
+
+ public FlowInfo analyseCode(BlockScope currentScope,
+ FlowContext flowContext, FlowInfo flowInfo) {
+
+ // need to stack a context to store explicit label, answer inits in case
+ // of normal completion merged
+ // with those relative to the exit path from break statement occurring
+ // inside the labeled statement.
+ if (statement == null) {
+ return flowInfo;
+ } else {
+ LabelFlowContext labelContext;
+ FlowInfo mergedInfo = statement.analyseCode(
+ currentScope,
+ (labelContext = new LabelFlowContext(flowContext, this,
+ label, (targetLabel = new Label()), currentScope)),
+ flowInfo).mergedWith(labelContext.initsOnBreak);
+ mergedInitStateIndex = currentScope.methodScope()
+ .recordInitializationStates(mergedInfo);
+ return mergedInfo;
+ }
+ }
+
+ public ASTNode concreteStatement() {
+
+ // return statement.concreteStatement(); // for supporting nested
+ // labels: a:b:c: someStatement (see 21912)
+ return statement;
+ }
+
+ /**
+ * Code generation for labeled statement
+ *
+ * may not need actual source positions recording
+ *
+ * @param currentScope
+ * net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
+ * @param codeStream
+ * net.sourceforge.phpdt.internal.compiler.codegen.CodeStream
+ */
+ // public void generateCode(BlockScope currentScope, CodeStream codeStream)
+ // {
+ //
+ // int pc = codeStream.position;
+ // if (targetLabel != null) {
+ // targetLabel.codeStream = codeStream;
+ // if (statement != null) {
+ // statement.generateCode(currentScope, codeStream);
+ // }
+ // targetLabel.place();
+ // }
+ // // May loose some local variable initializations : affecting the local
+ // variable attributes
+ // if (mergedInitStateIndex != -1) {
+ // codeStream.removeNotDefinitelyAssignedVariables(
+ // currentScope,
+ // mergedInitStateIndex);
+ // }
+ // codeStream.recordPositionsFrom(pc, this.sourceStart);
+ // }
+ public StringBuffer printStatement(int tab, StringBuffer output) {
+
+ printIndent(tab, output).append(label).append(": "); //$NON-NLS-1$
+ if (this.statement == null)
+ output.append(';');
+ else
+ this.statement.printStatement(0, output);
+ return output;
+ }
+
+ public void resolve(BlockScope scope) {
+
+ statement.resolve(scope);
+ }
+
+ public String toString(int tab) {
+
+ String s = tabString(tab);
+ s += new String(label) + ": " + statement.toString(0); //$NON-NLS-1$
+ return s;
+ }
+
+ public void traverse(ASTVisitor visitor, BlockScope blockScope) {
+
+ if (visitor.visit(this, blockScope)) {
+ statement.traverse(visitor, blockScope);
+ }
+ visitor.endVisit(this, blockScope);
+ }
+
+ public void resetStateForCodeGeneration() {
+ if (this.targetLabel != null) {
+ this.targetLabel.resetStateForCodeGeneration();
+ }
+ }
}
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