dspl
Class SymbolTable

java.lang.Object
  dspl.SymbolTable

All Implemented Interfaces:

ParserTokensTokenTypes

public class SymbolTable
extends java.lang.Object
implements ParserTokensTokenTypes

SymbolTable serves as a storage for all variables.
SymbolTable internally uses a HashMap to map identifiers to their corresponding Variable

Author:

David

Field Summary

private int	nextFloatConstIDInt
private int	nextStringIDInt When strings are added to the symbol table, their identifier is set as "stringLabel#" where # is this number, must be unique, so we increment it on each call
private java.util.HashMap	symbolHashMap HashMap used to map identifiers to Variable-typed objects for the Variable represented by the provided identifier

Fields inherited from interface dspl.frontend.ParserTokensTokenTypes

ASSIGN, COMMA, COMMENT, DECLS, DIGITS, DIV, DOT, EOF, EQ, GE, GT, ID, LBRACE, LBRACK, LE, LITERAL_byte, LITERAL_byte_array, LITERAL_ccall, LITERAL_complex, LITERAL_complex_array, LITERAL_else, LITERAL_float, LITERAL_float_array, LITERAL_for, LITERAL_if, LITERAL_int, LITERAL_int_array, LITERAL_string, LITERAL_ubyte, LITERAL_ubyte_array, LITERAL_uint, LITERAL_uint_array, LITERAL_while, LPAREN, LT, MINUS, MUL, NE, NEGATE, NEWLINE, NULL_TREE_LOOKAHEAD, NUM, PLUS, PROGRAM, RBRACE, RBRACK, REAL, RPAREN, SEMI, STRING, TILDE, WS

Constructor Summary

SymbolTable()
Constructor for SymbolTable

Method Summary

Variable	addStringVariable(java.lang.String identifier)
void	addVariable(Variable v) Adds the provided Variable to the Symbol table
void	constructTable(antlr.collections.AST tree) Takes the AST that represents the program being compiled and adds all of the variables found to the Symbol table
java.util.ArrayList	getAllVariables()
java.lang.String	getNextFloatConstID() Provides unique label for each string added to the symbol table
private java.lang.String	getNextStringID() Provides unique label for each string added to the symbol table
Variable	getVariable(java.lang.String identifier) Returns the Variable corresponding to the identifier provided

Methods inherited from class java.lang.Object

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

Field Detail

symbolHashMap

private java.util.HashMap symbolHashMap

HashMap used to map identifiers to Variable-typed objects for the Variable represented by the provided identifier

nextStringIDInt

private int nextStringIDInt

When strings are added to the symbol table, their identifier is set as "stringLabel#" where # is this number, must be unique, so we increment it on each call

nextFloatConstIDInt

private int nextFloatConstIDInt

Constructor Detail

SymbolTable

public SymbolTable()

Constructor for SymbolTable

Method Detail

getNextStringID

private java.lang.String getNextStringID()

Provides unique label for each string added to the symbol table

Returns:

getNextFloatConstID

public java.lang.String getNextFloatConstID()

Provides unique label for each string added to the symbol table

Returns:

constructTable

public void constructTable(antlr.collections.AST tree)
                    throws SymbolicException

Takes the AST that represents the program being compiled and adds all of the variables found to the Symbol table

Parameters:

tree -

Throws:

SymbolicException

addVariable

public void addVariable(Variable v)
                 throws SymbolicException

Adds the provided Variable to the Symbol table

Note: The same symbol cannot be added to the symbol table multiple times

Parameters:

v -

Throws:

SymbolicException

getVariable

public Variable getVariable(java.lang.String identifier)
                     throws SymbolicException

Returns the Variable corresponding to the identifier provided

Parameters:

the - identifier of the desired variable

Returns:

variable corresponding to the provided identifier if in SymbolTable, else returns null

Throws:

SymbolicException

addStringVariable

public Variable addStringVariable(java.lang.String identifier)
                           throws SymbolicException

Throws:

SymbolicException

getAllVariables

public java.util.ArrayList getAllVariables()