/*******************************************************************************
- * 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.flow;
import net.sourceforge.phpdt.internal.compiler.ast.Statement;
import net.sourceforge.phpdt.internal.compiler.lookup.LocalVariableBinding;
public abstract class FlowInfo {
- public static final UnconditionalFlowInfo DeadEnd = new UnconditionalFlowInfo(); // Represents a dead branch status of initialization
-abstract public UnconditionalFlowInfo addInitializationsFrom(UnconditionalFlowInfo otherInits);
-abstract public UnconditionalFlowInfo addPotentialInitializationsFrom(UnconditionalFlowInfo otherInits);
-public FlowInfo asNegatedCondition() {
- return this;
-}
-public boolean complainIfUnreachable(Statement statement, BlockScope scope) {
- // Report an error if necessary
- return false;
-}
-public static FlowInfo conditional(FlowInfo initsWhenTrue, FlowInfo initsWhenFalse){
- // if (initsWhenTrue.equals(initsWhenFalse)) return initsWhenTrue; -- could optimize if #equals is defined
- return new ConditionalFlowInfo(initsWhenTrue, initsWhenFalse);
-}
-abstract public FlowInfo copy();
-public static UnconditionalFlowInfo initial(int maxFieldCount) {
- UnconditionalFlowInfo info = new UnconditionalFlowInfo();
- info.maxFieldCount = maxFieldCount;
- return info;
-}
-abstract public FlowInfo initsWhenFalse();
-abstract public FlowInfo initsWhenTrue();
-final public boolean isDeadEnd() {
- return this == DeadEnd;
-}
-/**
- * Check status of definite assignment for a field.
- */
- abstract public boolean isDefinitelyAssigned(FieldBinding field);
-/**
- * Check status of definite assignment for a local.
- */
-public abstract boolean isDefinitelyAssigned(LocalVariableBinding local);
-abstract public boolean isFakeReachable();
-/**
- * Check status of potential assignment for a field.
- */
- abstract public boolean isPotentiallyAssigned(FieldBinding field);
-/**
- * Check status of potential assignment for a local variable.
- */
- abstract public boolean isPotentiallyAssigned(LocalVariableBinding field);
-/**
- * Record a field got definitely assigned.
- */
-abstract public void markAsDefinitelyAssigned(FieldBinding field);
-/**
- * Record a local got definitely assigned.
- */
-abstract public void markAsDefinitelyAssigned(LocalVariableBinding local);
-/**
- * Clear the initialization info for a field
- */
-abstract public void markAsDefinitelyNotAssigned(FieldBinding field);
-/**
- * Clear the initialization info for a local variable
- */
-abstract public void markAsDefinitelyNotAssigned(LocalVariableBinding local);
-abstract public FlowInfo markAsFakeReachable(boolean isFakeReachable);
-abstract public UnconditionalFlowInfo mergedWith(UnconditionalFlowInfo otherInits);
-public String toString(){
- if (this == DeadEnd){
- return "FlowInfo.DeadEnd"; //$NON-NLS-1$
+ public final static int REACHABLE = 0;
+
+ public final static int UNREACHABLE = 1;
+
+ public static final UnconditionalFlowInfo DEAD_END; // Represents a dead
+ // branch status of
+ // initialization
+ static {
+ DEAD_END = new UnconditionalFlowInfo();
+ DEAD_END.reachMode = UNREACHABLE;
}
- return super.toString();
-}
-abstract public UnconditionalFlowInfo unconditionalInits();
+
+ abstract public FlowInfo addInitializationsFrom(FlowInfo otherInits);
+
+ abstract public FlowInfo addPotentialInitializationsFrom(FlowInfo otherInits);
+
+ public FlowInfo asNegatedCondition() {
+
+ return this;
+ }
+
+ public boolean complainIfUnreachable(Statement statement, BlockScope scope,
+ boolean didAlreadyComplain) {
+
+ // Report an error if necessary
+ return false;
+ }
+
+ public static FlowInfo conditional(FlowInfo initsWhenTrue,
+ FlowInfo initsWhenFalse) {
+
+ // if (initsWhenTrue.equals(initsWhenFalse)) return initsWhenTrue; --
+ // could optimize if #equals is defined
+ return new ConditionalFlowInfo(initsWhenTrue, initsWhenFalse);
+ }
+
+ abstract public FlowInfo copy();
+
+ public static UnconditionalFlowInfo initial(int maxFieldCount) {
+ UnconditionalFlowInfo info = new UnconditionalFlowInfo();
+ info.maxFieldCount = maxFieldCount;
+ return info;
+ }
+
+ abstract public FlowInfo initsWhenFalse();
+
+ abstract public FlowInfo initsWhenTrue();
+
+ /**
+ * Check status of definite assignment for a field.
+ */
+ abstract public boolean isDefinitelyAssigned(FieldBinding field);
+
+ /**
+ * Check status of definite assignment for a local.
+ */
+ public abstract boolean isDefinitelyAssigned(LocalVariableBinding local);
+
+ // abstract public int reachMode();
+
+ /**
+ * Check status of potential assignment for a field.
+ */
+ abstract public boolean isPotentiallyAssigned(FieldBinding field);
+
+ /**
+ * Check status of potential assignment for a local variable.
+ */
+
+ abstract public boolean isPotentiallyAssigned(LocalVariableBinding field);
+
+ abstract public boolean isReachable();
+
+ /**
+ * Record a field got definitely assigned.
+ */
+ abstract public void markAsDefinitelyAssigned(FieldBinding field);
+
+ /**
+ * Record a local got definitely assigned.
+ */
+ abstract public void markAsDefinitelyAssigned(LocalVariableBinding local);
+
+ /**
+ * Clear the initialization info for a field
+ */
+ abstract public void markAsDefinitelyNotAssigned(FieldBinding field);
+
+ /**
+ * Clear the initialization info for a local variable
+ */
+ abstract public void markAsDefinitelyNotAssigned(LocalVariableBinding local);
+
+ abstract public int reachMode();
+
+ abstract public FlowInfo setReachMode(int reachMode);
+
+ /**
+ * Returns the receiver updated in the following way:
+ * <ul>
+ * <li> intersection of definitely assigned variables,
+ * <li> union of potentially assigned variables.
+ * </ul>
+ */
+ abstract public UnconditionalFlowInfo mergedWith(
+ UnconditionalFlowInfo otherInits);
+
+ public String toString() {
+
+ if (this == DEAD_END) {
+ return "FlowInfo.DEAD_END"; //$NON-NLS-1$
+ }
+ return super.toString();
+ }
+
+ abstract public UnconditionalFlowInfo unconditionalInits();
}
git://git.phpeclipse.com / phpeclipse.git / blobdiff