Store information about read/write access of variables in index, bug 156692.

1 files changed, 78 insertions, 0 deletions

diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/CPPVariableReadWriteFlags.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/CPPVariableReadWriteFlags.java
new file mode 100644
index 00000000000..c68029c4bde
--- /dev/null
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/CPPVariableReadWriteFlags.java
@@ -0,0 +1,78 @@
+/*******************************************************************************
+ * Copyright (c) 2007 Wind River Systems, Inc. and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Markus Schorn - initial API and implementation
+ *******************************************************************************/ 
+package org.eclipse.cdt.internal.core.pdom.dom.cpp;
+
+import org.eclipse.cdt.core.dom.ast.DOMException;
+import org.eclipse.cdt.core.dom.ast.IASTName;
+import org.eclipse.cdt.core.dom.ast.IASTNode;
+import org.eclipse.cdt.core.dom.ast.IASTUnaryExpression;
+import org.eclipse.cdt.core.dom.ast.IPointerType;
+import org.eclipse.cdt.core.dom.ast.IQualifierType;
+import org.eclipse.cdt.core.dom.ast.IType;
+import org.eclipse.cdt.core.dom.ast.cpp.ICPPASTUnaryExpression;
+import org.eclipse.cdt.core.dom.ast.cpp.ICPPReferenceType;
+import org.eclipse.cdt.internal.core.dom.parser.ITypeContainer;
+import org.eclipse.cdt.internal.core.pdom.dom.VariableReadWriteFlags;
+
+/**
+ * Helper class to determine whether a variable is accessed for reading and/or writing.
+ * The algorithm works starting from the variable and looking upwards what's being done
+ * with the variable.
+ */
+final class CPPVariableReadWriteFlags extends VariableReadWriteFlags {
+	
+	private static CPPVariableReadWriteFlags INSTANCE= new CPPVariableReadWriteFlags();
+
+	public static int getReadWriteFlags(IASTName variable) {
+		return INSTANCE.rwAnyNode(variable, 0);
+	}
+	
+	protected int rwInUnaryExpression(IASTNode node, IASTUnaryExpression expr, int indirection) {
+		switch (expr.getOperator()) {
+		case ICPPASTUnaryExpression.op_typeid:
+			return 0;
+		}
+		return super.rwInUnaryExpression(node, expr, indirection);
+	}
+
+	protected int rwAssignmentToType(IType type, int indirection) {
+		if (indirection == 0) {
+			if (!(type instanceof ICPPReferenceType)) {
+				return READ;
+			}
+			try {
+				type= ((ICPPReferenceType) type).getType();
+			}
+			catch (DOMException e) {
+				return READ; 	// fallback
+			}
+		}
+		try {
+			while(indirection > 0 && (type instanceof ITypeContainer)) {
+				if (type instanceof IPointerType) {
+					indirection--;
+				}
+				type= ((ITypeContainer) type).getType();
+			}
+			if (indirection == 0) {
+				if (type instanceof IQualifierType) {
+					return ((IQualifierType) type).isConst() ? READ : READ | WRITE;
+				}
+				else if (type instanceof IPointerType) {
+					return ((IPointerType) type).isConst() ? READ : READ | WRITE;
+				}
+			}
+		}
+		catch (DOMException e) {
+		}
+		return READ | WRITE;	// fallback
+	}
+}