Class CgenClassTable

java.lang.Object
  SymbolTable
      CgenClassTable

class CgenClassTable

extends SymbolTable

This class is used for representing the inheritance tree during code generation. You will need to fill in some of its methods and potentially extend it in other useful ways.

Field Summary

private int	boolclasstag
private int	intclasstag
private java.util.Vector	nds All classes in the program, represented as CgenNode
private java.io.PrintStream	str This is the stream to which assembly instructions are output
private int	stringclasstag

Constructor Summary

CgenClassTable(Classes cls, java.io.PrintStream str)
Constructs a new class table and invokes the code generator

Method Summary

void	addId(AbstractSymbol id, java.lang.Object info) Adds a new entry to the symbol table.
private void	buildInheritanceTree()
void	code() This method is the meat of the code generator.
private void	codeBools(int classtag) Emits code definitions for boolean constants.
private void	codeConstants() Emits code to reserve space for and initialize all of the constants.
private void	codeGlobalData() Emits code to start the .data segment and to declare the global names.
private void	codeGlobalText() Emits code to start the .text segment and to declare the global names.
private void	codeSelectGc() Generates GC choice constants (pointers to GC functions)
void	enterScope() Enters a new scope.
void	exitScope() Exits the most recently entered scope.
private void	installBasicClasses() Creates data structures representing basic Cool classes (Object, IO, Int, Bool, String).
private void	installClass(CgenNode nd)
private void	installClasses(Classes cs)
java.lang.Object	lookup(AbstractSymbol sym) Looks up an item through all scopes of the symbol table.
java.lang.Object	probe(AbstractSymbol sym) Probes the symbol table.
CgenNode	root() Gets the root of the inheritance tree
private void	setRelations(CgenNode nd)
java.lang.String	toString() Gets the string representation of the symbol table.

Methods inherited from class java.lang.Object

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

Field Detail

nds

private java.util.Vector nds

All classes in the program, represented as CgenNode

str

private java.io.PrintStream str

This is the stream to which assembly instructions are output

stringclasstag

private int stringclasstag

intclasstag

private int intclasstag

boolclasstag

private int boolclasstag

Constructor Detail

CgenClassTable

public CgenClassTable(Classes cls,
                      java.io.PrintStream str)

Constructs a new class table and invokes the code generator

Method Detail

codeGlobalData

private void codeGlobalData()

Emits code to start the .data segment and to declare the global names.

codeGlobalText

private void codeGlobalText()

Emits code to start the .text segment and to declare the global names.

codeBools

private void codeBools(int classtag)

Emits code definitions for boolean constants.

codeSelectGc

private void codeSelectGc()

Generates GC choice constants (pointers to GC functions)

codeConstants

private void codeConstants()

Emits code to reserve space for and initialize all of the constants. Class names should have been added to the string table (in the supplied code, is is done during the construction of the inheritance graph), and code for emitting string constants as a side effect adds the string's length to the integer table. The constants are emmitted by running through the stringtable and inttable and producing code for each entry.

installBasicClasses

private void installBasicClasses()

Creates data structures representing basic Cool classes (Object, IO, Int, Bool, String). Please note: as is this method does not do anything useful; you will need to edit it to make if do what you want.

installClass

private void installClass(CgenNode nd)

installClasses

private void installClasses(Classes cs)

buildInheritanceTree

private void buildInheritanceTree()

setRelations

private void setRelations(CgenNode nd)

code

public void code()

This method is the meat of the code generator. It is to be filled in programming assignment 5

root

public CgenNode root()

Gets the root of the inheritance tree

enterScope

public void enterScope()

Enters a new scope. A scope must be entered before anything can be added to the table.

exitScope

public void exitScope()

Exits the most recently entered scope.

addId

public void addId(AbstractSymbol id,
                  java.lang.Object info)

Adds a new entry to the symbol table.

Parameters:

id - the symbol

info - the data asosciated with id

lookup

public java.lang.Object lookup(AbstractSymbol sym)

Looks up an item through all scopes of the symbol table. If found it returns the associated information field, if not it returns null.

Parameters:

sym - the symbol

Returns:

the info associated with sym, or null if not found

probe

public java.lang.Object probe(AbstractSymbol sym)

Probes the symbol table. Check the top scope (only) for the symbol sym. If found, return the information field. If not return null.

Parameters:

sym - the symbol

Returns:

the info associated with sym, or null if not found

toString

public java.lang.String toString()

Gets the string representation of the symbol table.

Returns:

the string rep