--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Common Public License v0.5
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v05.html
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ ******************************************************************************/
+package net.sourceforge.phpdt.internal.compiler.ast;
+
+import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
+import net.sourceforge.phpdt.internal.compiler.impl.*;
+import net.sourceforge.phpdt.internal.compiler.codegen.*;
+import net.sourceforge.phpdt.internal.compiler.flow.*;
+import net.sourceforge.phpdt.internal.compiler.lookup.*;
+
+public class DoStatement extends Statement {
+
+ public Expression condition;
+ public Statement action;
+
+ private Label breakLabel, continueLabel;
+
+ // for local variables table attributes
+ int mergedInitStateIndex = -1;
+
+ public DoStatement(Expression condition, Statement action, int s, int e) {
+
+ this.sourceStart = s;
+ this.sourceEnd = e;
+ this.condition = condition;
+ this.action = action;
+ }
+
+ public FlowInfo analyseCode(
+ BlockScope currentScope,
+ FlowContext flowContext,
+ FlowInfo flowInfo) {
+
+ breakLabel = new Label();
+ continueLabel = new Label();
+ LoopingFlowContext loopingContext =
+ new LoopingFlowContext(
+ flowContext,
+ this,
+ breakLabel,
+ continueLabel,
+ currentScope);
+
+ Constant conditionConstant = condition.constant;
+ Constant conditionalConstant = condition.conditionalConstant();
+ boolean isFalseCondition =
+ ((conditionConstant != NotAConstant)
+ && (conditionConstant.booleanValue() == false))
+ || ((conditionalConstant != NotAConstant)
+ && (conditionalConstant.booleanValue() == false));
+
+ if ((action != null) && !action.isEmptyBlock()) {
+ flowInfo = action.analyseCode(currentScope, loopingContext, flowInfo.copy());
+
+ // code generation can be optimized when no need to continue in the loop
+ if ((flowInfo == FlowInfo.DeadEnd) || flowInfo.isFakeReachable()) {
+ if ((loopingContext.initsOnContinue == FlowInfo.DeadEnd)
+ || loopingContext.initsOnContinue.isFakeReachable()) {
+ continueLabel = null;
+ } else {
+ flowInfo = loopingContext.initsOnContinue; // for condition
+ if (isFalseCondition) {
+ // continueLabel = null; - cannot nil the label since may be targeted already by 'continue' statements
+ } else {
+ loopingContext.complainOnFinalAssignmentsInLoop(currentScope, flowInfo);
+ }
+ }
+ } else {
+ if (isFalseCondition) {
+ // continueLabel = null; - cannot nil the label since may be targeted already by 'continue' statements
+ } else {
+ loopingContext.complainOnFinalAssignmentsInLoop(currentScope, flowInfo);
+ }
+ }
+ }
+ LoopingFlowContext condLoopContext;
+ flowInfo =
+ condition.analyseCode(
+ currentScope,
+ (condLoopContext =
+ new LoopingFlowContext(flowContext, this, null, null, currentScope)),
+ (action == null
+ ? flowInfo
+ : (flowInfo.mergedWith(loopingContext.initsOnContinue))));
+ condLoopContext.complainOnFinalAssignmentsInLoop(currentScope, flowInfo);
+
+ // infinite loop
+ FlowInfo mergedInfo;
+ if ((condition.constant != NotAConstant)
+ && (condition.constant.booleanValue() == true)) {
+ mergedInfo = loopingContext.initsOnBreak;
+ mergedInitStateIndex =
+ currentScope.methodScope().recordInitializationStates(mergedInfo);
+ return mergedInfo;
+ }
+
+ // end of loop: either condition false or break
+ mergedInfo =
+ flowInfo.initsWhenFalse().unconditionalInits().mergedWith(
+ loopingContext.initsOnBreak);
+ mergedInitStateIndex =
+ currentScope.methodScope().recordInitializationStates(mergedInfo);
+ return mergedInfo;
+ }
+
+ /**
+ * Do statement code generation
+ *
+ */
+ public void generateCode(BlockScope currentScope, CodeStream codeStream) {
+
+ if ((bits & IsReachableMASK) == 0) {
+ return;
+ }
+ int pc = codeStream.position;
+
+ // labels management
+ Label actionLabel = new Label(codeStream);
+ actionLabel.place();
+ breakLabel.codeStream = codeStream;
+ if (continueLabel != null) {
+ continueLabel.codeStream = codeStream;
+ }
+
+ // generate action
+ if (action != null) {
+ action.generateCode(currentScope, codeStream);
+ }
+ // generate condition
+ if (continueLabel != null) {
+ continueLabel.place();
+ condition.generateOptimizedBoolean(
+ currentScope,
+ codeStream,
+ actionLabel,
+ null,
+ true);
+ }
+ breakLabel.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 void resetStateForCodeGeneration() {
+
+ this.breakLabel.resetStateForCodeGeneration();
+ this.continueLabel.resetStateForCodeGeneration();
+ }
+
+ public void resolve(BlockScope scope) {
+
+ TypeBinding type = condition.resolveTypeExpecting(scope, BooleanBinding);
+ condition.implicitWidening(type, type);
+ if (action != null)
+ action.resolve(scope);
+ }
+
+ public String toString(int tab) {
+
+ String inFront, s = tabString(tab);
+ inFront = s;
+ s = s + "do"; //$NON-NLS-1$
+ if (action == null)
+ s = s + " {}\n"; //$NON-NLS-1$
+ else if (action instanceof Block)
+ s = s + "\n" + action.toString(tab + 1) + "\n"; //$NON-NLS-2$ //$NON-NLS-1$
+ else
+ s = s + " {\n" + action.toString(tab + 1) + ";}\n"; //$NON-NLS-1$ //$NON-NLS-2$
+ s = s + inFront + "while (" + condition.toStringExpression() + ")"; //$NON-NLS-1$ //$NON-NLS-2$
+ return s;
+ }
+
+ public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
+
+ if (visitor.visit(this, scope)) {
+ if (action != null) {
+ action.traverse(visitor, scope);
+ }
+ condition.traverse(visitor, scope);
+ }
+ visitor.endVisit(this, scope);
+ }
+}
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