comp
Class Node

java.lang.Object
  |
  +--comp.Node

Direct Known Subclasses:

ArgList, AssignNode, BlockNode, ExprNode, FuncDefNode, IfNode, Module, ParmList, ReturnNode, VarDecl, WhileNode

public abstract class Node

extends java.lang.Object

The superclass of all AST Nodes.

Version:

$Id: Node.java,v 1.9 2003/01/21 01:36:07 dugan Exp $

Field Summary

(package private) static Assembler	asm
(package private) static Scope	globalScope There is one global scope.
(package private) static int	labelCount
(package private) static java.util.Map	strings A table of static strings.

Constructor Summary

Node()

Method Summary

void	addDefs(Scope s) Add any variable definitions made by this node to the given scope.
(package private) static void	addString(java.lang.String label, java.lang.String s)
abstract void	asHTML(java.io.PrintStream out) For printing the AST to HTML.
(package private) abstract java.lang.String	codeGen(Scope scope, RegBank bank) Generate code for this node.
(package private) static java.lang.String	getLabel()
java.lang.String	lvalue(Scope scope, RegBank bank) Answer a register that holds a pointer to this node's value.
static void	reset() Clears global counters and string table.
java.lang.String	rvalue(Scope scope, RegBank bank) Answer a register that holds this node's value.

Methods inherited from class java.lang.Object

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

Field Detail

asm

static Assembler asm

labelCount

static int labelCount

globalScope

static Scope globalScope

There is one global scope. Not used right now.

strings

static java.util.Map strings

A table of static strings.

Constructor Detail

Node

public Node()

Method Detail

getLabel

static java.lang.String getLabel()

addString

static void addString(java.lang.String label,
                      java.lang.String s)

reset

public static void reset()

Clears global counters and string table.

codeGen

abstract java.lang.String codeGen(Scope scope,
                                  RegBank bank)

Generate code for this node. If the code is an expression it should return a register name that holds the result. Otherwise null.

addDefs

public void addDefs(Scope s)

Add any variable definitions made by this node to the given scope.

asHTML

public abstract void asHTML(java.io.PrintStream out)

For printing the AST to HTML.

lvalue

public java.lang.String lvalue(Scope scope,
                               RegBank bank)

Answer a register that holds a pointer to this node's value.

rvalue

public java.lang.String rvalue(Scope scope,
                               RegBank bank)

Answer a register that holds this node's value.