-/*******************************************************************************
- * 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.codegen.*;
-import net.sourceforge.phpdt.internal.compiler.flow.*;
-import net.sourceforge.phpdt.internal.compiler.lookup.*;
+import java.util.List;
+/**
+ * A For statement.
+ * for(initializations;condition;increments) action
+ * @author Matthieu Casanova
+ */
public class ForStatement extends Statement {
-
- public Statement[] initializations;
- public Expression condition;
- public Statement[] increments;
- public Statement action;
- //when there is no local declaration, there is no need of a new scope
- //scope is positionned either to a new scope, or to the "upper"scope (see resolveType)
- public boolean neededScope;
- public BlockScope scope;
-
- private Label breakLabel, continueLabel;
-
- // for local variables table attributes
- int preCondInitStateIndex = -1;
- int condIfTrueInitStateIndex = -1;
- int mergedInitStateIndex = -1;
-
- public ForStatement(
- Statement[] initializations,
- Expression condition,
- Statement[] increments,
- Statement action,
- boolean neededScope,
- int s,
- int e) {
-
- this.sourceStart = s;
- this.sourceEnd = e;
- this.initializations = initializations;
- this.condition = condition;
- this.increments = increments;
- this.action = action;
- this.neededScope = neededScope;
- }
-
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
-
- breakLabel = new Label();
- continueLabel = new Label();
-
- // process the initializations
- if (initializations != null) {
- int count = initializations.length, i = 0;
- while (i < count) {
- flowInfo = initializations[i++].analyseCode(scope, flowContext, flowInfo);
- }
- }
- preCondInitStateIndex =
- currentScope.methodScope().recordInitializationStates(flowInfo);
-
- boolean conditionIsInlinedToTrue =
- condition == null || (condition.constant != NotAConstant && condition.constant.booleanValue() == true);
- boolean conditionIsInlinedToFalse =
- ! conditionIsInlinedToTrue && (condition.constant != NotAConstant && condition.constant.booleanValue() == false);
-
- // process the condition
- LoopingFlowContext condLoopContext = null;
- if (condition != null) {
- if (!conditionIsInlinedToTrue) {
- flowInfo =
- condition.analyseCode(
- scope,
- (condLoopContext =
- new LoopingFlowContext(flowContext, this, null, null, scope)),
- flowInfo);
- }
- }
-
- // process the action
- LoopingFlowContext loopingContext;
- FlowInfo actionInfo;
- if ((action == null) || action.isEmptyBlock()) {
- if (condLoopContext != null)
- condLoopContext.complainOnFinalAssignmentsInLoop(scope, flowInfo);
- if (conditionIsInlinedToTrue) {
- return FlowInfo.DeadEnd;
- } else {
- if (conditionIsInlinedToFalse){
- continueLabel = null; // for(;false;p());
- }
- actionInfo = flowInfo.initsWhenTrue().copy();
- loopingContext =
- new LoopingFlowContext(flowContext, this, breakLabel, continueLabel, scope);
- }
- } else {
- loopingContext =
- new LoopingFlowContext(flowContext, this, breakLabel, continueLabel, scope);
- FlowInfo initsWhenTrue = flowInfo.initsWhenTrue();
- condIfTrueInitStateIndex =
- currentScope.methodScope().recordInitializationStates(initsWhenTrue);
-
- actionInfo = conditionIsInlinedToFalse
- ? FlowInfo.DeadEnd // unreachable when condition inlined to false
- : initsWhenTrue.copy();
- if (!actionInfo.complainIfUnreachable(action, scope)) {
- actionInfo = action.analyseCode(scope, loopingContext, actionInfo);
- }
-
- // code generation can be optimized when no need to continue in the loop
- if (((actionInfo == FlowInfo.DeadEnd) || actionInfo.isFakeReachable())
- && ((loopingContext.initsOnContinue == FlowInfo.DeadEnd)
- || loopingContext.initsOnContinue.isFakeReachable())) {
- continueLabel = null;
- } else {
- if (condLoopContext != null)
- condLoopContext.complainOnFinalAssignmentsInLoop(scope, flowInfo);
- loopingContext.complainOnFinalAssignmentsInLoop(scope, actionInfo);
- actionInfo =
- actionInfo.mergedWith(loopingContext.initsOnContinue.unconditionalInits());
- // for increments
- }
- }
- if ((continueLabel != null) && (increments != null)) {
- LoopingFlowContext loopContext =
- new LoopingFlowContext(flowContext, this, null, null, scope);
- int i = 0, count = increments.length;
- while (i < count)
- actionInfo = increments[i++].analyseCode(scope, loopContext, actionInfo);
- loopContext.complainOnFinalAssignmentsInLoop(scope, flowInfo);
- }
-
- // infinite loop
- FlowInfo mergedInfo;
- if (conditionIsInlinedToTrue) {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(
- mergedInfo = loopingContext.initsOnBreak);
- return mergedInfo;
- }
-
- //end of loop: either condition false or break
- mergedInfo =
- flowInfo.initsWhenFalse().unconditionalInits().mergedWith(
- loopingContext.initsOnBreak.unconditionalInits());
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
- return mergedInfo;
- }
-
- /**
- * For statement code generation
- *
- * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
- * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
- */
- public void generateCode(BlockScope currentScope, CodeStream codeStream) {
-
- if ((bits & IsReachableMASK) == 0) {
- return;
- }
- int pc = codeStream.position;
-
- // generate the initializations
- if (initializations != null) {
- for (int i = 0, max = initializations.length; i < max; i++) {
- initializations[i].generateCode(scope, codeStream);
- }
- }
-
- // label management
- Label actionLabel = new Label(codeStream);
- Label conditionLabel = new Label(codeStream);
- breakLabel.codeStream = codeStream;
- if (continueLabel != null) {
- continueLabel.codeStream = codeStream;
- }
- // jump over the actionBlock
- if ((condition != null)
- && (condition.constant == NotAConstant)
- && !((action == null || action.isEmptyBlock()) && (increments == null))) {
- int jumpPC = codeStream.position;
- codeStream.goto_(conditionLabel);
- codeStream.recordPositionsFrom(jumpPC, condition.sourceStart);
- }
- // generate the loop action
- actionLabel.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(scope, codeStream);
- }
- // continuation point
- if (continueLabel != null) {
- continueLabel.place();
- // generate the increments for next iteration
- if (increments != null) {
- for (int i = 0, max = increments.length; i < max; i++) {
- increments[i].generateCode(scope, codeStream);
- }
- }
- }
-
- // May loose some local variable initializations : affecting the local variable attributes
- if (preCondInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- preCondInitStateIndex);
- }
-
- // generate the condition
- conditionLabel.place();
- if ((condition != null) && (condition.constant == NotAConstant)) {
- condition.generateOptimizedBoolean(scope, codeStream, actionLabel, null, true);
- } else {
- if (continueLabel != null) {
- codeStream.goto_(actionLabel);
- }
- }
- breakLabel.place();
-
- // May loose some local variable initializations : affecting the local variable attributes
- if (neededScope) {
- codeStream.exitUserScope(scope);
- }
- 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 upperScope) {
-
- // use the scope that will hold the init declarations
- scope = neededScope ? new BlockScope(upperScope) : upperScope;
- if (initializations != null)
- for (int i = 0, length = initializations.length; i < length; i++)
- initializations[i].resolve(scope);
- if (condition != null) {
- TypeBinding type = condition.resolveTypeExpecting(scope, BooleanBinding);
- condition.implicitWidening(type, type);
- }
- if (increments != null)
- for (int i = 0, length = increments.length; i < length; i++)
- increments[i].resolve(scope);
- if (action != null)
- action.resolve(scope);
- }
-
- public String toString(int tab) {
-
- String s = tabString(tab) + "for ("; //$NON-NLS-1$
- if (!neededScope)
- s = s + " //--NO upperscope scope needed\n" + tabString(tab) + " "; //$NON-NLS-2$ //$NON-NLS-1$
- //inits
- if (initializations != null) {
- for (int i = 0; i < initializations.length; i++) {
- //nice only with expressions
- s = s + initializations[i].toString(0);
- if (i != (initializations.length - 1))
- s = s + " , "; //$NON-NLS-1$
- }
- };
- s = s + "; "; //$NON-NLS-1$
- //cond
- if (condition != null)
- s = s + condition.toStringExpression();
- s = s + "; "; //$NON-NLS-1$
- //updates
- if (increments != null) {
- for (int i = 0; i < increments.length; i++) {
- //nice only with expressions
- s = s + increments[i].toString(0);
- if (i != (increments.length - 1))
- s = s + " , "; //$NON-NLS-1$
- }
- };
- s = s + ") "; //$NON-NLS-1$
- //block
- if (action == null)
- s = s + "{}"; //$NON-NLS-1$
- else
- s = s + "\n" + action.toString(tab + 1); //$NON-NLS-1$
- return s;
- }
-
- public void traverse(
- IAbstractSyntaxTreeVisitor visitor,
- BlockScope blockScope) {
-
- if (visitor.visit(this, blockScope)) {
- if (initializations != null) {
- int initializationsLength = initializations.length;
- for (int i = 0; i < initializationsLength; i++)
- initializations[i].traverse(visitor, scope);
- }
-
- if (condition != null)
- condition.traverse(visitor, scope);
-
- if (increments != null) {
- int incrementsLength = increments.length;
- for (int i = 0; i < incrementsLength; i++)
- increments[i].traverse(visitor, scope);
- }
-
- if (action != null)
- action.traverse(visitor, scope);
- }
- visitor.endVisit(this, blockScope);
- }
-}
\ No newline at end of file
+ /** the initializations. */
+ public Expression[] initializations;
+
+ /** the condition. */
+ public Expression condition;
+ /** the increments. */
+ public Expression[] increments;
+
+ public Statement action;
+
+ /**
+ * a for statement
+ * @param initializations the initializations expressions
+ * @param condition the condition when the for get out
+ * @param increments the increments statements
+ * @param action the action (a statement, a block ...)
+ * @param sourceStart the beginning sources
+ * @param sourceEnd the ending sources
+ */
+ public ForStatement(final Expression[] initializations,
+ final Expression condition,
+ final Expression[] increments,
+ final Statement action,
+ final int sourceStart,
+ final int sourceEnd) {
+ super(sourceStart, sourceEnd);
+ this.initializations = initializations;
+ this.condition = condition;
+ this.increments = increments;
+ this.action = action;
+ }
+
+ public String toString(final int tab) {
+ final StringBuffer buff = new StringBuffer(tabString(tab));
+ buff.append("for ("); //$NON-NLS-1$
+ //inits
+ if (initializations != null) {
+ for (int i = 0; i < initializations.length; i++) {
+ buff.append(initializations[i].toStringExpression());
+ if (i != (initializations.length - 1))
+ buff.append(" , "); //$NON-NLS-1$
+ }
+ }
+ buff.append("; "); //$NON-NLS-1$
+ //cond
+ if (condition != null) {
+ buff.append(condition.toStringExpression());
+ }
+ buff.append("; "); //$NON-NLS-1$
+ //updates
+ if (increments != null) {
+ for (int i = 0; i < increments.length; i++) {
+ //nice only with expressions
+ buff.append(increments[i].toStringExpression());
+ if (i != (increments.length - 1))
+ buff.append(" , "); //$NON-NLS-1$
+ }
+ }
+ buff.append(") "); //$NON-NLS-1$
+ //block
+ if (action == null)
+ buff.append("{}"); //$NON-NLS-1$
+ else
+ buff.append(action.toString(tab + 1)); //$NON-NLS-1$
+ return buff.toString();
+ }
+
+ /**
+ * Get the variables from outside (parameters, globals ...)
+ */
+ public void getOutsideVariable(final List list) {
+ if (condition != null) {
+ condition.getOutsideVariable(list);
+ }
+ if (action != null) {
+ action.getOutsideVariable(list);
+ }
+ if (initializations != null) {
+ for (int i = 0; i < initializations.length; i++) {
+ initializations[i].getOutsideVariable(list);
+ }
+ }
+ if (increments != null) {
+ for (int i = 0; i < increments.length; i++) {
+ increments[i].getOutsideVariable(list);
+ }
+ }
+ }
+
+ /**
+ * get the modified variables.
+ */
+ public void getModifiedVariable(final List list) {
+ if (condition != null) {
+ condition.getModifiedVariable(list);
+ }
+ if (action != null) {
+ action.getModifiedVariable(list);
+ }
+ if (initializations != null) {
+ for (int i = 0; i < initializations.length; i++) {
+ initializations[i].getModifiedVariable(list);
+ }
+ }
+ if (increments != null) {
+ for (int i = 0; i < increments.length; i++) {
+ increments[i].getModifiedVariable(list);
+ }
+ }
+ }
+
+ /**
+ * Get the variables used.
+ */
+ public void getUsedVariable(final List list) {
+ if (condition != null) {
+ condition.getUsedVariable(list);
+ }
+ if (action != null) {
+ action.getUsedVariable(list);
+ }
+ if (initializations != null) {
+ for (int i = 0; i < initializations.length; i++) {
+ initializations[i].getUsedVariable(list);
+ }
+ }
+ if (increments != null) {
+ for (int i = 0; i < increments.length; i++) {
+ increments[i].getUsedVariable(list);
+ }
+ }
+ }
+}
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