polyglot.ast

Class Cast_c

java.lang.Object

polyglot.ast.Node_c

polyglot.ast.Term_c

polyglot.ast.Expr_c

polyglot.ast.Cast_c

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Cast, Expr, ExprOps, Node, NodeOps, Prefix, Receiver, Term, TermOps, Typed, Copy<Node>

public class Cast_c
extends Expr_c
implements Cast

A Cast is an immutable representation of a casting operation. It consists of an Expr being cast and a TypeNode being cast to.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface polyglot.util.Copy

Copy.Util

Nested classes/interfaces inherited from interface polyglot.ast.Term

Term.Instance

Field Summary

Fields

Modifier and Type	Field and Description
protected TypeNode	castType
protected Expr	expr

Fields inherited from class polyglot.ast.Expr_c

type

Fields inherited from class polyglot.ast.Term_c

exceptions, reachable

Fields inherited from class polyglot.ast.Node_c

del, error, ext, position

Fields inherited from interface polyglot.ast.Term

ENTRY, EXIT

Constructor Summary

Constructors

Constructor and Description
Cast_c(Position pos, TypeNode castType, Expr expr)
Cast_c(Position pos, TypeNode castType, Expr expr, Ext ext)

Method Summary

Methods

Modifier and Type	Method and Description
<T> java.util.List<T>	acceptCFG(CFGBuilder<?> v, java.util.List<T> succs) Visit this term in evaluation order, calling v.edge() for each successor in succs, if data flows on that edge.
TypeNode	castType() The type to cast to.
protected <N extends Cast_c> N	castType(N n, TypeNode castType)
Cast	castType(TypeNode castType) Set the type to cast to.
Type	childExpectedType(Expr child, AscriptionVisitor av) Get the expected type of a child expression of this.
java.lang.Object	constantValue(Lang lang) Return the constant value of the expression, if any.
Node	copy(NodeFactory nf) Produce a copy of this node using the given NodeFactory.
Expr	expr() The expression to cast.
Cast	expr(Expr expr) Set the expression to cast.
protected <N extends Cast_c> N	expr(N n, Expr expr)
Term	firstChild() Return the first direct subterm performed when evaluating this term.
boolean	isConstant(Lang lang) Return whether the expression evaluates to a constant.
Precedence	precedence() Get the precedence of the expression.
void	prettyPrint(CodeWriter w, PrettyPrinter tr) Pretty-print the AST using the given CodeWriter.
protected <N extends Cast_c> N	reconstruct(N n, TypeNode castType, Expr expr) Reconstruct the expression.
java.util.List<Type>	throwTypes(TypeSystem ts) List of Types of exceptions that might get thrown.
java.lang.String	toString()
Node	typeCheck(TypeChecker tc) Type check the AST.
Node	visitChildren(NodeVisitor v) Visit the children of the node.

Methods inherited from class polyglot.ast.Expr_c

booleanValue, buildTypes, byteValue, charValue, constantValue, constantValueSet, constantValueSet, doubleValue, dump, extRewrite, floatValue, intValue, isConstant, isTypeChecked, lastLang, longValue, printSubExpr, printSubExpr, shortValue, stringValue, type, type, type

Methods inherited from class polyglot.ast.Term_c

exceptionCheck, exceptions, exceptions, exceptions, listChild, reachable, reachable, reachable

Methods inherited from class polyglot.ast.Node_c

addDecls, buildTypesEnter, checkConstants, copy, copy, copyIfNeeded, del, del, disambiguate, disambiguateEnter, disambiguateOverride, dump, dump, dump, dump, enterChildScope, enterScope, error, error, error, exceptionCheckEnter, ext, ext, ext, ext, extRewriteEnter, isDisambiguated, lang, position, position, position, prettyPrint, prettyPrint, prettyPrint, prettyPrint, print, printBlock, printSubStmt, translate, typeCheckEnter, typeCheckOverride, visit, visitChild, visitEdge, visitList

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface polyglot.ast.Expr

constantValue, constantValueSet, isConstant, printSubExpr, printSubExpr, type

Methods inherited from interface polyglot.ast.Node

del, del, dump, error, error, ext, ext, ext, ext, isDisambiguated, isTypeChecked, position, position, visit, visitEdge

Methods inherited from interface polyglot.ast.NodeOps

addDecls, buildTypes, buildTypesEnter, checkConstants, copy, disambiguate, disambiguateEnter, disambiguateOverride, dump, dump, dump, dump, enterChildScope, enterScope, exceptionCheck, exceptionCheckEnter, extRewrite, extRewriteEnter, lang, prettyPrint, prettyPrint, prettyPrint, prettyPrint, translate, typeCheckEnter, typeCheckOverride, visitChild, visitList

Methods inherited from interface polyglot.util.Copy

copy

Methods inherited from interface polyglot.ast.Typed

type

Methods inherited from interface polyglot.ast.Term

exceptions, exceptions, reachable, reachable

Field Detail

castType

protected TypeNode castType

expr

protected Expr expr

Constructor Detail

Cast_c

public Cast_c(Position pos,
      TypeNode castType,
      Expr expr)

Cast_c

public Cast_c(Position pos,
      TypeNode castType,
      Expr expr,
      Ext ext)

Method Detail

precedence

public Precedence precedence()

Description copied from interface: Expr

Get the precedence of the expression.

Specified by:

precedence in interface Expr

Overrides:

precedence in class Expr_c

castType

public TypeNode castType()

Description copied from interface: Cast

The type to cast to.

Specified by:

castType in interface Cast

castType

public Cast castType(TypeNode castType)

Description copied from interface: Cast

Set the type to cast to.

Specified by:

castType in interface Cast

castType

protected <N extends Cast_c> N castType(N n,
                            TypeNode castType)

expr

public Expr expr()

Description copied from interface: Cast

The expression to cast.

Specified by:

expr in interface Cast

expr

public Cast expr(Expr expr)

Description copied from interface: Cast

Set the expression to cast.

Specified by:

expr in interface Cast

expr

protected <N extends Cast_c> N expr(N n,
                        Expr expr)

reconstruct

protected <N extends Cast_c> N reconstruct(N n,
                               TypeNode castType,
                               Expr expr)

Reconstruct the expression.

visitChildren

public Node visitChildren(NodeVisitor v)

Description copied from interface: NodeOps

Visit the children of the node.

Specified by:

visitChildren in interface NodeOps

Overrides:

visitChildren in class Node_c

Parameters:

v - The visitor that will traverse/rewrite the AST.

Returns:

A new AST if a change was made, or this.

typeCheck

public Node typeCheck(TypeChecker tc)
               throws SemanticException

Description copied from interface: NodeOps

Type check the AST. This method is called by the leave() method of the visitor. The method should perform work that should be done after visiting the children of the node. The method may return this or a new copy of the node which will be installed as a child of the node's parent.

Specified by:

typeCheck in interface NodeOps

Overrides:

typeCheck in class Node_c

Parameters:

tc - The type checking visitor.

Throws:

SemanticException

childExpectedType

public Type childExpectedType(Expr child,
                     AscriptionVisitor av)

Description copied from interface: NodeOps

Get the expected type of a child expression of this. The expected type is determined by the context in that the child occurs (e.g., for x = e, the expected type of e is the declared type of x. The expected type should impose the least constraints on the child's type that are allowed by the parent node.

Specified by:

childExpectedType in interface NodeOps

Overrides:

childExpectedType in class Node_c

Parameters:

child - A child expression of this node.

av - An ascription visitor.

Returns:

The expected type of child.

toString

public java.lang.String toString()

Overrides:

toString in class Node_c

prettyPrint

public void prettyPrint(CodeWriter w,
               PrettyPrinter tr)

Description copied from class: Node_c

Pretty-print the AST using the given CodeWriter.

Specified by:

prettyPrint in interface NodeOps

Overrides:

prettyPrint in class Node_c

Parameters:

w - The code writer to which to write.

tr - The pretty printer. This is not a visitor.

firstChild

public Term firstChild()

Description copied from interface: TermOps

Return the first direct subterm performed when evaluating this term. If this term has no subterms, this should return null. This method is similar to the deprecated entry(), but it should *not* recursively drill down to the innermost subterm. The direct child visited first in this term's dataflow should be returned.

Specified by:

firstChild in interface TermOps

Specified by:

firstChild in class Term_c

acceptCFG

public <T> java.util.List<T> acceptCFG(CFGBuilder<?> v,
                              java.util.List<T> succs)

Description copied from interface: TermOps

Visit this term in evaluation order, calling v.edge() for each successor in succs, if data flows on that edge.

Specified by:

acceptCFG in interface TermOps

Specified by:

acceptCFG in class Term_c

throwTypes

public java.util.List<Type> throwTypes(TypeSystem ts)

Description copied from interface: NodeOps

List of Types of exceptions that might get thrown. The result is not necessarily correct until after type checking.

Specified by:

throwTypes in interface NodeOps

Overrides:

throwTypes in class Node_c

isConstant

public boolean isConstant(Lang lang)

Description copied from interface: ExprOps

Return whether the expression evaluates to a constant. Requires that disambiguation has been done, and that constantValueSet() is true.

Specified by:

isConstant in interface ExprOps

Overrides:

isConstant in class Expr_c

constantValue

public java.lang.Object constantValue(Lang lang)

Description copied from interface: ExprOps

Return the constant value of the expression, if any. Requires that isConstant() is true.

Specified by:

constantValue in interface ExprOps

Overrides:

constantValue in class Expr_c

copy

public Node copy(NodeFactory nf)

Description copied from interface: NodeOps

Produce a copy of this node using the given NodeFactory.

Specified by:

copy in interface NodeOps

Overrides:

copy in class Node_c