edu.mit.ai.psg.jeva.examples
Class TraceCallsEvalHook

java.lang.Object
  |
  +--edu.mit.ai.psg.jeva.JevaVisitorBase
        |
        +--edu.mit.ai.psg.jeva.examples.TraceAllEvalHook
              |
              +--edu.mit.ai.psg.jeva.examples.TraceCallsEvalHook

public class TraceCallsEvalHook

extends TraceAllEvalHook

TraceCallsEvalHook traces only method call expressions. This version only works on single threaded programs. Output defaults to System.err. It produce traces of the following form:

->System.out.println("result: "+fib(5))
| ->fib(5)
| | ->fib(n-2)
| | | {n=5}
| | | ->fib(n-2)
| | | | {n=3}
| | | <- 1
| | | ->fib(n-1)
| | | | {n=3}
| | | <- 1
| | <- 2
| | ->fib(n-1)
| | | {n=5}
| | | ->fib(n-2)
| | | | {n=4}
| | | <- 1
| | | ->fib(n-1)
| | | | {n=4}
| | | | ->fib(n-2)
| | | | | {n=3}
| | | | <- 1
| | | | ->fib(n-1)
| | | | | {n=3}
| | | | <- 1
| | | <- 2
| | <- 3
| <- 5
result: 5
<- null

Author:

CarlManning, caroma@ai.mit.edu
Copyright (c) 1999 Massachusetts Institute of Technology

Inner classes inherited from class edu.mit.ai.psg.jeva.examples.TraceAllEvalHook

TraceAllEvalHook.FreeSimpleNamesCollector

Constructor Summary

TraceCallsEvalHook()

TraceCallsEvalHook(PrintWriter pw)

Method Summary

static void	main(String[] ignore) test
Object	visit(IJevaNode node, Object data) Override default to not trace
Object	visit(JNEMethodInvocationExpression node, Object data) Cause trace on method invocations

Methods inherited from class edu.mit.ai.psg.jeva.examples.TraceAllEvalHook

trace, visit, visit

Methods inherited from class edu.mit.ai.psg.jeva.JevaVisitorBase

visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

TraceCallsEvalHook

public TraceCallsEvalHook()

TraceCallsEvalHook

public TraceCallsEvalHook(PrintWriter pw)

Method Detail

visit

public Object visit(IJevaNode node,
                    Object data)

Override default to not trace

Overrides:

visit in class TraceAllEvalHook

visit

public Object visit(JNEMethodInvocationExpression node,
                    Object data)

Cause trace on method invocations

Overrides:

visit in class JevaVisitorBase

main

public static void main(String[] ignore)

test