jminusminus

Class JPlusAssignOp

java.lang.Object

jminusminus.JAST

jminusminus.JStatement

jminusminus.JExpression

jminusminus.JBinaryExpression

jminusminus.JAssignment

jminusminus.JPlusAssignOp

 class JPlusAssignOp
extends JAssignment

The AST node for a += expression. A += expression has two operands: a lhs and a rhs.

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

Constructor and Description
JPlusAssignOp(int line, JExpression lhs, JExpression rhs) Construct the AST node for a += expression given its lhs and rhs operands.

Method Summary

Methods

Modifier and Type	Method and Description
JExpression	analyze(Context context) Analyze the lhs and rhs, rewrite rhs as lhs + rhs (string concatenation) if lhs is a String, and set the result type.
void	codegen(CLEmitter output) Code generation for += involves, generating code for loading any necessary l-value onto the stack, for (unless a string concatenation) loading the r-value, for (unless a statement) copying the r-value to its proper place on the stack, and for doing the store.

Methods inherited from class jminusminus.JBinaryExpression

writeToStdOut

Methods inherited from class jminusminus.JExpression

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

JPlusAssignOp

public JPlusAssignOp(int line,
             JExpression lhs,
             JExpression rhs)

Construct the AST node for a += expression given its lhs and rhs operands.

Parameters:

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

lhs - the lhs operand.

rhs - the rhs operand.

Method Detail

analyze

public JExpression analyze(Context context)

Analyze the lhs and rhs, rewrite rhs as lhs + rhs (string concatenation) if lhs is a String, and set the result type.

Specified by:

analyze in class JExpression

Parameters:

context - context in which names are resolved.

Returns:

the analyzed (and possibly rewritten) AST subtree.

codegen

public void codegen(CLEmitter output)

Code generation for += involves, generating code for loading any necessary l-value onto the stack, for (unless a string concatenation) loading the r-value, for (unless a statement) copying the r-value to its proper place on the stack, and for doing the store.

Specified by:

codegen in class JAST

Parameters:

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