+++ /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 WhileStatement extends Statement {
-
- public Expression condition;
- public Statement action;
- private Label breakLabel, continueLabel;
- int preCondInitStateIndex = -1;
- int condIfTrueInitStateIndex = -1;
- int mergedInitStateIndex = -1;
-
- public WhileStatement(Expression condition, Statement action, int s, int e) {
-
- this.condition = condition;
- this.action = action;
- sourceStart = s;
- sourceEnd = e;
- }
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
- breakLabel = new Label();
- continueLabel = new Label();
-
- Constant cst = this.condition.constant;
- boolean isConditionTrue = cst != NotAConstant && cst.booleanValue() == true;
- boolean isConditionFalse = cst != NotAConstant && cst.booleanValue() == false;
-
- cst = this.condition.optimizedBooleanConstant();
- boolean isConditionOptimizedTrue = cst != NotAConstant && cst.booleanValue() == true;
- boolean isConditionOptimizedFalse = cst != NotAConstant && cst.booleanValue() == false;
-
- preCondInitStateIndex =
- currentScope.methodScope().recordInitializationStates(flowInfo);
- LoopingFlowContext condLoopContext;
- FlowInfo postCondInfo =
- this.condition.analyseCode(
- currentScope,
- (condLoopContext =
- new LoopingFlowContext(flowContext, this, null, null, currentScope)),
- flowInfo);
-
- LoopingFlowContext loopingContext;
- FlowInfo actionInfo;
-// if (action == null
-// || (action.isEmptyBlock() && currentScope.environment().options.complianceLevel <= CompilerOptions.JDK1_3)) {
-// condLoopContext.complainOnFinalAssignmentsInLoop(currentScope, postCondInfo);
-// if (isConditionTrue) {
-// return FlowInfo.DEAD_END;
-// } else {
-// FlowInfo mergedInfo = postCondInfo.initsWhenFalse().unconditionalInits();
-// if (isConditionOptimizedTrue){
-// mergedInfo.setReachMode(FlowInfo.UNREACHABLE);
-// }
-// mergedInitStateIndex =
-// currentScope.methodScope().recordInitializationStates(mergedInfo);
-// return mergedInfo;
-// }
-// } else {
- // in case the condition was inlined to false, record the fact that there is no way to reach any
- // statement inside the looping action
- loopingContext =
- new LoopingFlowContext(
- flowContext,
- this,
- breakLabel,
- continueLabel,
- currentScope);
- if (isConditionFalse) {
- actionInfo = FlowInfo.DEAD_END;
- } else {
- actionInfo = postCondInfo.initsWhenTrue().copy();
- if (isConditionOptimizedFalse){
- actionInfo.setReachMode(FlowInfo.UNREACHABLE);
- }
- }
-
- // for computing local var attributes
- condIfTrueInitStateIndex =
- currentScope.methodScope().recordInitializationStates(
- postCondInfo.initsWhenTrue());
-
- if (!actionInfo.complainIfUnreachable(action, currentScope, false)) {
- actionInfo = action.analyseCode(currentScope, loopingContext, actionInfo);
- }
-
- // code generation can be optimized when no need to continue in the loop
- if (!actionInfo.isReachable() && !loopingContext.initsOnContinue.isReachable()) {
- continueLabel = null;
- } else {
- // TODO: (philippe) should simplify in one Loop context
- condLoopContext.complainOnFinalAssignmentsInLoop(currentScope, postCondInfo);
- loopingContext.complainOnFinalAssignmentsInLoop(currentScope, actionInfo);
- }
-// }
-
- // infinite loop
- FlowInfo mergedInfo;
- if (isConditionOptimizedTrue) {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(
- mergedInfo = loopingContext.initsOnBreak);
- return mergedInfo;
- }
-
- // end of loop: either condition false or break
- mergedInfo =
- postCondInfo.initsWhenFalse().unconditionalInits().mergedWith(
- loopingContext.initsOnBreak);
- if (isConditionOptimizedTrue && continueLabel == null){
- mergedInfo.setReachMode(FlowInfo.UNREACHABLE);
- }
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
- return mergedInfo;
- }
-
- /**
- * While code generation
- *
- * @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) {
-//
-// if ((bits & IsReachableMASK) == 0) {
-// return;
-// }
-// int pc = codeStream.position;
-// breakLabel.codeStream = codeStream;
-//
-// // generate condition
-// if (continueLabel == null) {
-// // no need to reverse condition
-// if (condition.constant == NotAConstant) {
-// condition.generateOptimizedBoolean(
-// currentScope,
-// codeStream,
-// null,
-// breakLabel,
-// true);
-// }
-// } else {
-// continueLabel.codeStream = codeStream;
-// if (!(((condition.constant != NotAConstant)
-// && (condition.constant.booleanValue() == true))
-// || (action == null)
-// || action.isEmptyBlock())) {
-// int jumpPC = codeStream.position;
-// codeStream.goto_(continueLabel);
-// codeStream.recordPositionsFrom(jumpPC, condition.sourceStart);
-// }
-// }
-// // generate the action
-// Label actionLabel;
-// (actionLabel = new Label(codeStream)).place();
-// if (action != null) {
-// // Required to fix 1PR0XVS: LFRE:WINNT - Compiler: variable table for method appears incorrect
-// if (condIfTrueInitStateIndex != -1) {
-// // insert all locals initialized inside the condition into the action generated prior to the condition
-// codeStream.addDefinitelyAssignedVariables(
-// currentScope,
-// condIfTrueInitStateIndex);
-// }
-// action.generateCode(currentScope, codeStream);
-// // May loose some local variable initializations : affecting the local variable attributes
-// if (preCondInitStateIndex != -1) {
-// codeStream.removeNotDefinitelyAssignedVariables(
-// currentScope,
-// preCondInitStateIndex);
-// }
-//
-// }
-// // output condition and branch back to the beginning of the repeated action
-// 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 StringBuffer printStatement(int tab, StringBuffer output) {
-
- printIndent(tab, output).append("while ("); //$NON-NLS-1$
- condition.printExpression(0, output).append(')');
- if (action == null)
- output.append(';');
- else
- action.printStatement(tab + 1, output);
- return output;
- }
- 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 s = tabString(tab);
- s = s + "while (" + condition.toStringExpression() + ")"; //$NON-NLS-1$ //$NON-NLS-2$
- if (action == null)
- s = s + " {} ;"; //$NON-NLS-1$
- else if (action instanceof Block)
- s = s + "\n" + action.toString(tab + 1); //$NON-NLS-1$
- else
- s = s + " {\n" + action.toString(tab + 1) + "}"; //$NON-NLS-2$ //$NON-NLS-1$
- return s;
- }
-
- public void traverse(
- ASTVisitor visitor,
- BlockScope blockScope) {
-
- if (visitor.visit(this, blockScope)) {
- condition.traverse(visitor, blockScope);
- if (action != null)
- action.traverse(visitor, blockScope);
- }
- visitor.endVisit(this, blockScope);
- }
-}
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