jminusminus

Class JBooleanBinaryExpression

java.lang.Object

jminusminus.JAST

jminusminus.JStatement

jminusminus.JExpression

jminusminus.JBinaryExpression

jminusminus.JBooleanBinaryExpression

Direct Known Subclasses:

JComparison, JEqualOp, JLogicalAndOp

abstract class JBooleanBinaryExpression
extends JBinaryExpression

Most binary expressions that return booleans can be recognized by their syntax. We take advantage of this to define a common codegen(), which relies on the short-circuiting code generation for control and puts either a 1 or a 0 onto the stack.

Field Summary

Fields inherited from class jminusminus.JBinaryExpression

lhs, operator, rhs

Fields inherited from class jminusminus.JExpression

isStatementExpression, type

Fields inherited from class jminusminus.JAST

compilationUnit, line

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	JBooleanBinaryExpression(int line, String operator, JExpression lhs, JExpression rhs) Construct an AST node for a boolean binary expression.

Method Summary

Methods

Modifier and Type	Method and Description
void	codegen(CLEmitter output) Generate code for the case where we actually want a boolean value (true or false) computed onto the stack, eg for assignment to a boolean variable.

Methods inherited from class jminusminus.JBinaryExpression

writeToStdOut

Methods inherited from class jminusminus.JExpression

analyze, codegen, isStatementExpression, type

Methods inherited from class jminusminus.JAST

line, partialCodegen

Methods inherited from class java.lang.Object

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

Constructor Detail

JBooleanBinaryExpression

protected JBooleanBinaryExpression(int line,
                        String operator,
                        JExpression lhs,
                        JExpression rhs)

Construct an AST node for a boolean binary expression.

Parameters:

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

operator - the boolean binary operator.

lhs - lhs operand.

rhs - rhs operand.

Method Detail

codegen

public void codegen(CLEmitter output)

Generate code for the case where we actually want a boolean value (true or false) computed onto the stack, eg for assignment to a boolean variable.

Specified by:

codegen in class JAST

Parameters:

output - the code emitter (basically an abstraction for producing the .class file).