com.adamcornett.cminus.codegen
Class ClassGenerator

java.lang.Object
  com.adamcornett.cminus.codegen.ClassGenerator

public class ClassGenerator
extends Object

Generates a Jasmin class file from an abstract syntax tree.

Uses the CMTree.emitCode(ClassGenerator) method to generate code. That method should recursively traverse the tree to generate the appropriate Jasmin code.

Author:

Adam Cornett

Field Summary

private String	className The name of the class, the same as name of the source file.
private int	indentLevel The current indent level, for making pretty code.
private org.apache.commons.logging.Log	log
private PrintStream	output The output print stream
private org.antlr.runtime.tree.CommonTree	progTree The root node of the AST

Constructor Summary

ClassGenerator(String className, org.antlr.runtime.tree.CommonTree programTree)
Create a new Class Generator, based on the class name and AST parameters

Method Summary

void	emitComment(String message, Object... args) Emit a comment in to the Jasmin file. Should be called from a AST node's emit code method.
private void	emitConstructor()
private void	emitFoot() emit the footer code
private void	emitHead() Emit the class header code
private void	emitLB() Emit a blank line
void	emitLine(String code, Object... args) Emit a line of code.
private void	emitNode(ProgramTree node) Begin emiting code starting with the root node
private void	emitPrintFunctions()
void	generateCode() Generate the Jasmin code for the class
String	getClassName()
private String	getIndents() Get a string with the appropriate number of tabs
void	popIndent() Decrease the indent level
void	pushIndent() Increase the indent level

Methods inherited from class java.lang.Object

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

Field Detail

className

private final String className

The name of the class, the same as name of the source file.

indentLevel

private int indentLevel

The current indent level, for making pretty code.

log

private final org.apache.commons.logging.Log log

output

private final PrintStream output

The output print stream

progTree

private final org.antlr.runtime.tree.CommonTree progTree

The root node of the AST

Constructor Detail

ClassGenerator

public ClassGenerator(String className,
                      org.antlr.runtime.tree.CommonTree programTree)
               throws FileNotFoundException

Create a new Class Generator, based on the class name and AST parameters

Parameters:

className - The name of the class to create

programTree - The AST of the program

Throws:

FileNotFoundException - If there is an error creating the output file.

Method Detail

emitComment

public void emitComment(String message,
                        Object... args)

Emit a comment in to the Jasmin file.
Should be called from a AST node's emit code method.

Parameters:

message - The formatted string

args - The arguments for printf

See Also:

String.format(String, Object...)

emitLine

public void emitLine(String code,
                     Object... args)

Emit a line of code.
Should be called from a AST node's emit code method.

Parameters:

code - The formatted line of code to emit

args - The arguments for printf

See Also:

String.format(String, Object...)

generateCode

public void generateCode()

Generate the Jasmin code for the class

getClassName

public String getClassName()

popIndent

public void popIndent()

Decrease the indent level

pushIndent

public void pushIndent()

Increase the indent level

emitConstructor

private void emitConstructor()

emitFoot

private void emitFoot()

emit the footer code

emitHead

private void emitHead()

Emit the class header code

emitLB

private void emitLB()

Emit a blank line

emitNode

private void emitNode(ProgramTree node)

Begin emiting code starting with the root node

Parameters:

node - The root node of the AST

emitPrintFunctions

private void emitPrintFunctions()

getIndents

private String getIndents()

Get a string with the appropriate number of tabs

Returns:

A string consisting of indentLevel number of tabs.