/*******************************************************************************
- * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
+ * 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 v0.5
+ * 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-v05.html
+ * http://www.eclipse.org/legal/cpl-v10.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.*;
+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) {
sourceEnd = e;
}
- public FlowInfo analyseCode(
- BlockScope currentScope,
- FlowContext flowContext,
- FlowInfo flowInfo) {
+ public FlowInfo analyseCode(BlockScope currentScope,
+ FlowContext flowContext, FlowInfo flowInfo) {
breakLabel = new Label();
continueLabel = new Label();
- preCondInitStateIndex =
- currentScope.methodScope().recordInitializationStates(flowInfo);
+ 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 =
- condition.analyseCode(
- currentScope,
- (condLoopContext =
- new LoopingFlowContext(flowContext, this, null, null, currentScope)),
- flowInfo);
+ FlowInfo postCondInfo = this.condition.analyseCode(currentScope,
+ (condLoopContext = new LoopingFlowContext(flowContext, this,
+ null, null, currentScope)), flowInfo);
LoopingFlowContext loopingContext;
- if ((action == null) || action.isEmptyBlock()) {
- condLoopContext.complainOnFinalAssignmentsInLoop(currentScope, postCondInfo);
- if ((condition.constant != NotAConstant)
- && (condition.constant.booleanValue() == true)) {
- return FlowInfo.DeadEnd;
- } else {
- FlowInfo mergedInfo = postCondInfo.initsWhenFalse().unconditionalInits();
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
- return mergedInfo;
- }
+ 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 {
- // 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);
- FlowInfo actionInfo =
- ((condition.constant != Constant.NotAConstant)
- && (condition.constant.booleanValue() == false))
- ? FlowInfo.DeadEnd
- : postCondInfo.initsWhenTrue().copy();
-
- // for computing local var attributes
- condIfTrueInitStateIndex =
- currentScope.methodScope().recordInitializationStates(
- postCondInfo.initsWhenTrue());
-
- if (!actionInfo.complainIfUnreachable(action, currentScope)) {
- actionInfo = action.analyseCode(currentScope, loopingContext, actionInfo);
+ actionInfo = postCondInfo.initsWhenTrue().copy();
+ if (isConditionOptimizedFalse) {
+ actionInfo.setReachMode(FlowInfo.UNREACHABLE);
}
+ }
- // 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 {
- condLoopContext.complainOnFinalAssignmentsInLoop(currentScope, postCondInfo);
- loopingContext.complainOnFinalAssignmentsInLoop(currentScope, actionInfo);
- }
+ // 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 ((condition.constant != Constant.NotAConstant)
- && (condition.constant.booleanValue() == true)) {
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(
- mergedInfo = loopingContext.initsOnBreak);
+ 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);
- mergedInitStateIndex =
- currentScope.methodScope().recordInitializationStates(mergedInfo);
+ 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 org.eclipse.jdt.internal.compiler.lookup.BlockScope
- * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
+ *
+ * @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);
+ // 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();
}
- breakLabel.place();
-
- // May loose some local variable initializations : affecting the local variable attributes
- if (mergedInitStateIndex != -1) {
- codeStream.removeNotDefinitelyAssignedVariables(
- currentScope,
- mergedInitStateIndex);
+ if (this.continueLabel != null) {
+ this.continueLabel.resetStateForCodeGeneration();
}
- codeStream.recordPositionsFrom(pc, this.sourceStart);
}
- public void resetStateForCodeGeneration() {
+ public StringBuffer printStatement(int tab, StringBuffer output) {
- this.breakLabel.resetStateForCodeGeneration();
- this.continueLabel.resetStateForCodeGeneration();
+ 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);
+ 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() + ")"; //$NON-NLS-1$ //$NON-NLS-2$
+ s = s + "while (" + condition.toStringExpression() + ")"; //$NON-NLS-1$ //$NON-NLS-2$
if (action == null)
s = s + " {} ;"; //$NON-NLS-1$
else if (action instanceof Block)
return s;
}
- public void traverse(
- IAbstractSyntaxTreeVisitor visitor,
- BlockScope blockScope) {
+ public void traverse(ASTVisitor visitor, BlockScope blockScope) {
if (visitor.visit(this, blockScope)) {
condition.traverse(visitor, blockScope);
}
visitor.endVisit(this, blockScope);
}
-}
\ No newline at end of file
+}
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