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-rw-r--r--third_party/checker_framework_dataflow/java/org/checkerframework/dataflow/cfg/node/AssignmentNode.java95
1 files changed, 95 insertions, 0 deletions
diff --git a/third_party/checker_framework_dataflow/java/org/checkerframework/dataflow/cfg/node/AssignmentNode.java b/third_party/checker_framework_dataflow/java/org/checkerframework/dataflow/cfg/node/AssignmentNode.java
new file mode 100644
index 0000000000..d48666a1a6
--- /dev/null
+++ b/third_party/checker_framework_dataflow/java/org/checkerframework/dataflow/cfg/node/AssignmentNode.java
@@ -0,0 +1,95 @@
+package org.checkerframework.dataflow.cfg.node;
+
+import java.util.Collection;
+import java.util.LinkedList;
+
+import org.checkerframework.dataflow.cfg.node.AssignmentContext.AssignmentLhsContext;
+import org.checkerframework.dataflow.util.HashCodeUtils;
+
+import org.checkerframework.javacutil.InternalUtils;
+
+import com.sun.source.tree.AssignmentTree;
+import com.sun.source.tree.CompoundAssignmentTree;
+import com.sun.source.tree.Tree;
+import com.sun.source.tree.UnaryTree;
+import com.sun.source.tree.VariableTree;
+
+/**
+ * A node for an assignment:
+ *
+ * <pre>
+ * <em>variable</em> = <em>expression</em>
+ * <em>expression</em> . <em>field</em> = <em>expression</em>
+ * <em>expression</em> [ <em>index</em> ] = <em>expression</em>
+ * </pre>
+ *
+ * We allow assignments without corresponding AST {@link Tree}s.
+ *
+ * @author Stefan Heule
+ *
+ */
+public class AssignmentNode extends Node {
+
+ protected Tree tree;
+ protected Node lhs;
+ protected Node rhs;
+
+ public AssignmentNode(Tree tree, Node target, Node expression) {
+ super(InternalUtils.typeOf(tree));
+ assert tree instanceof AssignmentTree || tree instanceof VariableTree
+ || tree instanceof CompoundAssignmentTree || tree instanceof UnaryTree;
+ assert target instanceof FieldAccessNode
+ || target instanceof LocalVariableNode
+ || target instanceof ArrayAccessNode;
+ this.tree = tree;
+ this.lhs = target;
+ this.rhs = expression;
+ rhs.setAssignmentContext(new AssignmentLhsContext(lhs));
+ }
+
+ public Node getTarget() {
+ return lhs;
+ }
+
+ public Node getExpression() {
+ return rhs;
+ }
+
+ @Override
+ public Tree getTree() {
+ return tree;
+ }
+
+ @Override
+ public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
+ return visitor.visitAssignment(this, p);
+ }
+
+ @Override
+ public String toString() {
+ return getTarget() + " = " + getExpression();
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (obj == null || !(obj instanceof AssignmentNode)) {
+ return false;
+ }
+ AssignmentNode other = (AssignmentNode) obj;
+ return getTarget().equals(other.getTarget())
+ && getExpression().equals(other.getExpression());
+ }
+
+ @Override
+ public int hashCode() {
+ return HashCodeUtils.hash(getTarget(), getExpression());
+ }
+
+ @Override
+ public Collection<Node> getOperands() {
+ LinkedList<Node> list = new LinkedList<Node>();
+ list.add(getTarget());
+ list.add(getExpression());
+ return list;
+ }
+}