Class OpExprNode

Object
  ASTNode
      ExprNode
          OpExprNode

public class OpExprNode
extends ExprNode

An AST node representing an operator applied to one or two operands, as in "exp1 + exp2" or "NOT exp".

Nested Class Summary

Nested classes/interfaces inherited from class ASTNode

ASTNode.Opcode

Field Summary

Fields inherited from class ExprNode

column, line, type

Constructor Summary

OpExprNode(ExprNode left, ExprNode right, ASTNode.Opcode opcode)
Creates a new OpExprNode.

Method Summary

void	codeGen(int reg) Generates code to load the value of this expression into a register.
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 ExprNode

codeGen

Methods inherited from class ASTNode

indent, toString

Methods inherited from class Object

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

Constructor Detail

OpExprNode

public OpExprNode(ExprNode left,
                  ExprNode right,
                  ASTNode.Opcode opcode)

Creates a new OpExprNode.

Parameters:

left - the left operand. Will be null if the operator is a unary operator.

right - the right operand.

opcode - the opcode.

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(int reg)

Generates code to load the value of this expression into a register.

Overrides:

codeGen in class ExprNode

Parameters:

reg - the number of the s register where the result should be placed.