jminusminus

Class JReturnStatement

java.lang.Object

jminusminus.JAST

jminusminus.JStatement

jminusminus.JReturnStatement

 class JReturnStatement
extends JStatement

The AST node for a return-statement. If the enclosing method in non-void, then there is a value to return, so we keep track of the expression denoting that value and its type.

Field Summary

Fields inherited from class jminusminus.JAST

compilationUnit, line

Constructor Summary

Constructors

Constructor and Description
JReturnStatement(int line, JExpression expr) Construct an AST node for a return-statement given its line number, and the expression that is returned.

Method Summary

Methods

Modifier and Type	Method and Description
JStatement	analyze(Context context) Analysis distinguishes between our being in a constructor or in a regular method in checking return types.
void	codegen(CLEmitter output) Generate code for the return statement.
void	writeToStdOut(PrettyPrinter p) Write the information pertaining to this AST to STDOUT.

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

JReturnStatement

public JReturnStatement(int line,
                JExpression expr)

Construct an AST node for a return-statement given its line number, and the expression that is returned.

Parameters:

line - line in which the return-statement appears in the source file.

expr - the returned expression.

Method Detail

analyze

public JStatement analyze(Context context)

Analysis distinguishes between our being in a constructor or in a regular method in checking return types. In the case of a return expression, analyze it and check types. Determine the (possibly void) return type.

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)

Generate code for the return statement. In the case of void method types, generate a simple (void) return. In the case of a return expression, generate code to load that onto the stack and then generate the appropriate return instruction.

Specified by:

codegen in class JAST

Parameters:

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

writeToStdOut

public void writeToStdOut(PrettyPrinter p)

Description copied from class: JAST

Write the information pertaining to this AST to STDOUT.

Specified by:

writeToStdOut in class JAST

Parameters:

p - for pretty printing with indentation.