X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Forg%2Feclipse%2Fjdt%2Finternal%2Fcompiler%2Fflow%2FLoopingFlowContext.java;fp=src%2Forg%2Feclipse%2Fjdt%2Finternal%2Fcompiler%2Fflow%2FLoopingFlowContext.java;h=450bdffb43b1d6c97163679107bb56b966de12cc;hb=040fa5af2cd00017cf3575950cdaade34a6d7f6c;hp=0000000000000000000000000000000000000000;hpb=a580fb8376d315d05e4d6bfdff9ff1101a151cd6;p=org.ibex.tool.git

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
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;
+			}
+		}
+	}
+}