removed Makefile; lifted repo/org.ibex.tool/src/ to src/

[org.ibex.tool.git] / src / org / eclipse / jdt / internal / compiler / flow / LoopingFlowContext.java

diff --git a/src/org/eclipse/jdt/internal/compiler/flow/LoopingFlowContext.java b/src/org/eclipse/jdt/internal/compiler/flow/LoopingFlowContext.java
new file mode 100644 (file)
index 0000000..450bdff
--- /dev/null
+++ b/src/org/eclipse/jdt/internal/compiler/flow/LoopingFlowContext.java
@@ -0,0 +1,153 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2004 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 org.eclipse.jdt.internal.compiler.flow;
+
+import org.eclipse.jdt.internal.compiler.ast.ASTNode;
+import org.eclipse.jdt.internal.compiler.ast.Reference;
+import org.eclipse.jdt.internal.compiler.codegen.Label;
+import org.eclipse.jdt.internal.compiler.lookup.BlockScope;
+import org.eclipse.jdt.internal.compiler.lookup.FieldBinding;
+import org.eclipse.jdt.internal.compiler.lookup.LocalVariableBinding;
+import org.eclipse.jdt.internal.compiler.lookup.Scope;
+import org.eclipse.jdt.internal.compiler.lookup.VariableBinding;
+
+/**
+ * Reflects the context of code analysis, keeping track of enclosing
+ *     try statements, exception handlers, etc...
+ */
+public class LoopingFlowContext extends SwitchFlowContext {
+       
+       public Label continueLabel;
+       public UnconditionalFlowInfo initsOnContinue = FlowInfo.DEAD_END;
+       Reference finalAssignments[];
+       VariableBinding finalVariables[];
+       int assignCount = 0;
+       Scope associatedScope;
+       
+       public LoopingFlowContext(
+               FlowContext parent,
+               ASTNode associatedNode,
+               Label breakLabel,
+               Label continueLabel,
+               Scope associatedScope) {
+               super(parent, associatedNode, breakLabel);
+               this.continueLabel = continueLabel;
+               this.associatedScope = associatedScope;
+       }
+       
+       public void complainOnFinalAssignmentsInLoop(
+               BlockScope scope,
+               FlowInfo flowInfo) {
+               for (int i = 0; i < assignCount; i++) {
+                       VariableBinding variable = finalVariables[i];
+                       if (variable == null) continue;
+                       boolean complained = false; // remember if have complained on this final assignment
+                       if (variable instanceof FieldBinding) {
+                               if (flowInfo.isPotentiallyAssigned((FieldBinding) variable)) {
+                                       complained = true;
+                                       scope.problemReporter().duplicateInitializationOfBlankFinalField(
+                                               (FieldBinding) variable,
+                                               finalAssignments[i]);
+                               }
+                       } else {
+                               if (flowInfo.isPotentiallyAssigned((LocalVariableBinding) variable)) {
+                                       complained = true;
+                                       scope.problemReporter().duplicateInitializationOfFinalLocal(
+                                               (LocalVariableBinding) variable,
+                                               finalAssignments[i]);
+                               }
+                       }
+                       // any reference reported at this level is removed from the parent context where it 
+                       // could also be reported again
+                       if (complained) {
+                               FlowContext context = parent;
+                               while (context != null) {
+                                       context.removeFinalAssignmentIfAny(finalAssignments[i]);
+                                       context = context.parent;
+                               }
+                       }
+               }
+       }
+
+       public Label continueLabel() {
+               return continueLabel;
+       }
+
+       public String individualToString() {
+               StringBuffer buffer = new StringBuffer("Looping flow context"); //$NON-NLS-1$
+               buffer.append("[initsOnBreak -").append(initsOnBreak.toString()).append(']'); //$NON-NLS-1$
+               buffer.append("[initsOnContinue -").append(initsOnContinue.toString()).append(']'); //$NON-NLS-1$
+               return buffer.toString();
+       }
+
+       public boolean isContinuable() {
+               return true;
+       }
+
+       public boolean isContinuedTo() {
+               return initsOnContinue != FlowInfo.DEAD_END;
+       }
+
+       public void recordContinueFrom(FlowInfo flowInfo) {
+
+               if (!flowInfo.isReachable()) return;
+               if (initsOnContinue == FlowInfo.DEAD_END) {
+                       initsOnContinue = flowInfo.copy().unconditionalInits();
+               } else {
+                       initsOnContinue = initsOnContinue.mergedWith(flowInfo.copy().unconditionalInits());
+               }
+       }
+
+       boolean recordFinalAssignment(
+               VariableBinding binding,
+               Reference finalAssignment) {
+
+               // do not consider variables which are defined inside this loop
+               if (binding instanceof LocalVariableBinding) {
+                       Scope scope = ((LocalVariableBinding) binding).declaringScope;
+                       while ((scope = scope.parent) != null) {
+                               if (scope == associatedScope)
+                                       return false;
+                       }
+               }
+               if (assignCount == 0) {
+                       finalAssignments = new Reference[5];
+                       finalVariables = new VariableBinding[5];
+               } else {
+                       if (assignCount == finalAssignments.length)
+                               System.arraycopy(
+                                       finalAssignments,
+                                       0,
+                                       (finalAssignments = new Reference[assignCount * 2]),
+                                       0,
+                                       assignCount);
+                       System.arraycopy(
+                               finalVariables,
+                               0,
+                               (finalVariables = new VariableBinding[assignCount * 2]),
+                               0,
+                               assignCount);
+               }
+               finalAssignments[assignCount] = finalAssignment;
+               finalVariables[assignCount++] = binding;
+               return true;
+       }
+
+       void removeFinalAssignmentIfAny(Reference reference) {
+               for (int i = 0; i < assignCount; i++) {
+                       if (finalAssignments[i] == reference) {
+                               finalAssignments[i] = null;
+                               finalVariables[i] = null;
+                               return;
+                       }
+               }
+       }
+}