Class IfStmtNode

Object
  ASTNode
      StmtNode
          IfStmtNode

public class IfStmtNode
extends StmtNode

An AST node representing an "if" statement: "IF cond THEN stmts [ELSIF stmts]* [ELSE stmts]? END IF;".

Nested Class Summary

static class

IfStmtNode.IfThen A condition and corresponding sequence of statements corresponding to an if/then or elsif/then clause of an if statement.

Nested classes/interfaces inherited from class ASTNode

ASTNode.Opcode

Field Summary

Fields inherited from class StmtNode

enclosingProc, exitLabel

Constructor Summary

IfStmtNode(IfStmtNode.IfThen head, List<IfStmtNode.IfThen> elsifs, List<StmtNode> elseClause)
Creates a new IfStmtNode.

Method Summary

void	codeGen(StmtNode loop) Generates code 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

IfStmtNode

public IfStmtNode(IfStmtNode.IfThen head,
                  List<IfStmtNode.IfThen> elsifs,
                  List<StmtNode> elseClause)

Creates a new IfStmtNode.

Parameters:

head - the head "if ... then ..."

elsifs - list of "elsif ... then ..." clauses (may be empty)

elseClause - the body of the "else" clause (my be null)

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)

Generates code for this statement.

Overrides:

codeGen in class StmtNode

Parameters:

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