Package jminusminus

Class JExpression

java.lang.Object

jminusminus.JAST

jminusminus.JStatement

jminusminus.JExpression

Direct Known Subclasses:

JArrayExpression, JArrayInitializer, JBinaryExpression, JCastOp, JConditionalExpression, JFieldSelection, JInstanceOfOp, JLiteralBoolean, JLiteralChar, JLiteralDouble, JLiteralInt, JLiteralLong, JLiteralNull, JLiteralString, JMessageExpression, JNewArrayOp, JNewOp, JSuper, JSuperConstruction, JThis, JThisConstruction, JUnaryExpression, JVariable, JWildExpression

abstract class JExpression
extends JStatement

The AST node for an expression. The syntax says all expressions are statements, but a semantic check throws some (those without a side-effect) out. Every expression has a type and a flag indicating whether or not it's a statement-expression.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	isStatementExpression	Whether or not this expression is a statement.
protected Type	type	Expression type.

Fields inherited from class jminusminus.JAST

compilationUnit, line

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	JExpression(int line)	Constructs an AST node for an expression.

Method Summary

Modifier and Type	Method	Description
abstract JExpression	analyze(Context context)	Analyzes and returns a JExpression.
void	codegen(CLEmitter output, String targetLabel, boolean onTrue)	Performs short-circuit code generation for a boolean expression, given the code emitter, a target label, and whether we branch to that label on true or on false.
boolean	isStatementExpression()	Returns true if this expression is being used as a statement, and false otherwise.
Type	type()	Returns the expression type.

Methods inherited from class jminusminus.JAST

codegen, line, partialCodegen, toJSON, unescape

Methods inherited from class java.lang.Object

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

Field Details

type

protected Type type

Expression type.

isStatementExpression

protected boolean isStatementExpression

Whether or not this expression is a statement.

Constructor Details

JExpression

protected JExpression(int line)

Constructs an AST node for an expression.

Parameters:

line - line in which the expression occurs in the source file.

Method Details

type

public Type type()

Returns the expression type.

Returns:

the expression type.

isStatementExpression

public boolean isStatementExpression()

Returns true if this expression is being used as a statement, and false otherwise.

Returns:

true if this expression is being used as a statement, and false otherwise.

analyze

public abstract JExpression analyze(Context context)

Analyzes and returns a JExpression.

Specified by:

analyze in class JAST

Parameters:

context - context in which names are resolved.

Returns:

the analyzed (and possibly rewritten) AST subtree.

codegen

public void codegen(CLEmitter output,
 String targetLabel,
 boolean onTrue)

Performs short-circuit code generation for a boolean expression, given the code emitter, a target label, and whether we branch to that label on true or on false.

Parameters:

output - the code emitter.

targetLabel - the label to which we should branch.

onTrue - do we branch on true?