org.checkerframework.dataflow.cfg.node

Class AssignmentNode

java.lang.Object

org.checkerframework.dataflow.cfg.node.Node

org.checkerframework.dataflow.cfg.node.AssignmentNode

All Implemented Interfaces:

org.plumelib.util.UniqueId

public class AssignmentNode
extends Node

A node for an assignment:

   variable = expression
   variable += expression
   expression . field = expression
   expression [ index ] = expression
 

We allow assignments without corresponding AST Trees.

Some desugarings create additional assignments to synthetic local variables. Such assignment nodes are marked as synthetic to allow special handling in transfer functions.

String concatenation compound assignments are desugared to an assignment and a string concatenation.

Numeric compound assignments are desugared to an assignment and a numeric operation.

Field Summary

Fields

Modifier and Type	Field and Description
protected Node	lhs The node for the LHS of the assignment tree.
protected Node	rhs The node for the RHS of the assignment tree.
protected boolean	synthetic Whether the assignment node is synthetic
protected Tree	tree The underlying assignment tree.

Fields inherited from class org.checkerframework.dataflow.cfg.node.Node

block, inSource, lvalue, type

Constructor Summary

Constructors

Constructor and Description
AssignmentNode(Tree tree, Node target, Node expression) Create a (non-synthetic) AssignmentNode.
AssignmentNode(Tree tree, Node target, Node expression, boolean synthetic) Create an AssignmentNode.

Method Summary

Modifier and Type	Method and Description
<R,P> R	accept(NodeVisitor<R,P> visitor, P p) Accept method of the visitor pattern.
boolean	equals(@Nullable Object obj)
Node	getExpression() Returns the right-hand-side of the assignment.
Collection<Node>	getOperands() Returns a collection containing all of the operand Nodes of this Node.
Node	getTarget() Returns the left-hand-side of the assignment.
Tree	getTree() Returns the Tree in the abstract syntax tree, or null if no corresponding tree exists.
int	hashCode()
boolean	isSynthetic() Check if the assignment node is synthetic, e.g.
String	toString()

Methods inherited from class org.checkerframework.dataflow.cfg.node.Node

getBlock, getInSource, getTransitiveOperands, getType, getUid, isLValue, nodeCollectionToString, setBlock, setInSource, setLValue, toStringDebug

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.plumelib.util.UniqueId

getClassAndUid

Field Detail

tree

protected final Tree tree

The underlying assignment tree.

lhs

protected final Node lhs

The node for the LHS of the assignment tree.

rhs

protected final Node rhs

The node for the RHS of the assignment tree.

synthetic

protected final boolean synthetic

Whether the assignment node is synthetic

Constructor Detail

AssignmentNode

public AssignmentNode(Tree tree,
                      Node target,
                      Node expression)

Create a (non-synthetic) AssignmentNode.

Parameters:

tree - the AssignmentTree corresponding to the AssignmentNode

target - the lhs of tree

expression - the rhs of tree

AssignmentNode

public AssignmentNode(Tree tree,
                      Node target,
                      Node expression,
                      boolean synthetic)

Create an AssignmentNode.

Parameters:

tree - the AssignmentTree corresponding to the AssignmentNode

target - the lhs of tree

expression - the rhs of tree

synthetic - whether the assignment node is synthetic

Method Detail

getTarget

@Pure
public Node getTarget()

Returns the left-hand-side of the assignment.

Returns:

the left-hand-side of the assignment

getExpression

@Pure
public Node getExpression()

Returns the right-hand-side of the assignment.

Returns:

the right-hand-side of the assignment

getTree

@Pure
public Tree getTree()

Description copied from class: Node

Returns the Tree in the abstract syntax tree, or null if no corresponding tree exists. For instance, this is the case for an ImplicitThisNode.

Specified by:

getTree in class Node

Returns:

the corresponding Tree or null

isSynthetic

@Pure
public boolean isSynthetic()

Check if the assignment node is synthetic, e.g. the synthetic assignment in a ternary expression.

Returns:

true if the assignment node is synthetic

accept

public <R,P> R accept(NodeVisitor<R,P> visitor,
                      P p)

Description copied from class: Node

Accept method of the visitor pattern.

Specified by:

accept in class Node

Type Parameters:

R - result type of the operation

P - parameter type

Parameters:

visitor - the visitor to be applied to this node

p - the parameter for this operation

toString

@Pure
public String toString()

Overrides:

toString in class Object

equals

@Pure
public boolean equals(@Nullable Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getOperands

@Pure
public Collection<Node> getOperands()

Description copied from class: Node

Returns a collection containing all of the operand Nodes of this Node.

Specified by:

getOperands in class Node

Returns:

a collection containing all of the operand Nodes of this Node