Class NullStmtNode

Object
  ASTNode
      StmtNode
          NullStmtNode

public class NullStmtNode
extends StmtNode

An AST node representing a null statement: "null;".

Nested Class Summary

Nested classes/interfaces inherited from class ASTNode

ASTNode.Opcode

Field Summary

Fields inherited from class StmtNode

enclosingProc, exitLabel

Constructor Summary

NullStmtNode(int line, int column)
Creates a new NullStmtNode.

Method Summary

void	codeGen(StmtNode loop) Does nothing (no code needed for this statement).
void	resolveNames(SymbolTable symtab) Resolves all applied uses of identifiers in the tree rooted at this node.
void	resolveTypes(ProcDeclNode proc) Fills in types for all Symbols bound to IdNodes.
void	unparse(PrintWriter p, int level) Prints a source representation of the tree rooted at this node on output stream p.

Methods inherited from class ASTNode

indent, toString

Methods inherited from class Object

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

Constructor Detail

NullStmtNode

public NullStmtNode(int line,
                    int column)

Creates a new NullStmtNode.

Parameters:

line - the line of the first thing after the NULL keyword.

column - the column of the first thing after the NULL keyword.

Method Detail

unparse

public void unparse(PrintWriter p,
                    int level)

Prints a source representation of the tree rooted at this node on output stream p.

Specified by:

unparse in class ASTNode

Parameters:

p - the place to display the output.

level - the number of levels of indentation to use if the output requires more than one line.

resolveNames

public void resolveNames(SymbolTable symtab)

Resolves all applied uses of identifiers in the tree rooted at this node.

Specified by:

resolveNames in class ASTNode

Parameters:

symtab - the symbol table to be used.

resolveTypes

public void resolveTypes(ProcDeclNode proc)

Fills in types for all Symbols bound to IdNodes. Prints error messages as necessary.

Specified by:

resolveTypes in class ASTNode

Parameters:

proc - the smallest enclosing procedure or function declaration.

codeGen

public void codeGen(StmtNode loop)

Does nothing (no code needed for this statement).

Overrides:

codeGen in class StmtNode

Parameters:

loop - the smallest enclosing ForStmtNode or WhileStmtNode, if any.