+++ /dev/null
-/*******************************************************************************
- * 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.phpeclipse.internal.compiler.ast;
-
-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.LoopingFlowContext;
-import net.sourceforge.phpdt.internal.compiler.impl.Constant;
-import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
-import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
-
-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 cst = condition.constant;
- boolean isConditionTrue = cst != NotAConstant && cst.booleanValue() == true;
- cst = condition.optimizedBooleanConstant();
- boolean isConditionOptimizedTrue = cst != NotAConstant && cst.booleanValue() == true;
- boolean isConditionOptimizedFalse = cst != NotAConstant && cst.booleanValue() == false;
-
- int previousMode = flowInfo.reachMode();
-
- if ((action != null) && !action.isEmptyBlock()) {
- flowInfo = action.analyseCode(currentScope, loopingContext, flowInfo);
-
- // code generation can be optimized when no need to continue in the loop
- if (!flowInfo.isReachable() && !loopingContext.initsOnContinue.isReachable()) {
- continueLabel = null;
- }
- }
- /* Reset reach mode, to address following scenario.
- * final blank;
- * do { if (true) break; else blank = 0; } while(false);
- * blank = 1; // may be initialized already
- */
- flowInfo.setReachMode(previousMode);
-
- flowInfo =
- condition.analyseCode(
- currentScope,
- loopingContext,
- (action == null
- ? flowInfo
- : (flowInfo.mergedWith(loopingContext.initsOnContinue))));
- if (!isConditionOptimizedFalse && continueLabel != null) {
- loopingContext.complainOnFinalAssignmentsInLoop(currentScope, flowInfo);
- }
-
- // infinite loop
- FlowInfo mergedInfo;
- if (isConditionTrue) {
- mergedInfo = loopingContext.initsOnBreak;
- if (!mergedInfo.isReachable()) mergedInfo.addPotentialInitializationsFrom(flowInfo.initsWhenFalse());
- } else {
- // end of loop: either condition false or break
- mergedInfo =
- flowInfo.initsWhenFalse().unconditionalInits().mergedWith(
- loopingContext.initsOnBreak);
- if (isConditionOptimizedTrue && !loopingContext.initsOnBreak.isReachable()) {
- mergedInfo.setReachMode(FlowInfo.UNREACHABLE);
- }
- }
- 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() {
- if (this.breakLabel != null) {
- this.breakLabel.resetStateForCodeGeneration();
- }
- if (this.continueLabel != null) {
- 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 StringBuffer printStatement(int indent, StringBuffer output) {
-
- printIndent(indent, output).append("do"); //$NON-NLS-1$
- if (action == null)
- output.append(" ;\n"); //$NON-NLS-1$
- else {
- output.append('\n');
- action.printStatement(indent + 1, output).append('\n');
- }
- output.append("while ("); //$NON-NLS-1$
- return condition.printExpression(0, output).append(");"); //$NON-NLS-1$
- }
- 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(ASTVisitor visitor, BlockScope scope) {
-
- if (visitor.visit(this, scope)) {
- if (action != null) {
- action.traverse(visitor, scope);
- }
- condition.traverse(visitor, scope);
- }
- visitor.endVisit(this, scope);
- }
-}
git://secure.phpeclipse.com / phpeclipse.git / blobdiff