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

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

Direct Known Subclasses:

TraceCallsEvalHook

public class TraceAllEvalHook

extends JevaVisitorBase

TraceAllEvalHook traces evaluation of each java construct. This version only works on single threaded programs. Output defaults to System.err. (note: requires edu.mit.ai.psg.strings). It produce traces of the following form:

->for (int i = 0; i < 1; i++) {
|   break;
| }
| ->0
| <-0
| ->i < 1
| | {i=0}
| | ->i
| | <-0
| | ->1
| | <-1
| <-true
| ->{
| |   break;
| | }
| | ->break;
| | <-break
| <-break
<-

Author:

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

Inner Class Summary

static class

TraceAllEvalHook.FreeSimpleNamesCollector Collect free simple names in node

Constructor Summary

TraceAllEvalHook()

TraceAllEvalHook(PrintWriter pw)

Method Summary

static void	main(String[] ignore) test
Object	trace(IJevaNode node, Object data) trace: prints out "->[node]" on calls, and "<-[result]" on results.
Object	visit(IJevaNode node, Object data) default method: trace all nodes.
Object	visit(JNELiteralExpression node, Object data) Doesn't trace literals
Object	visit(JNName node, Object data) Doesn't trace simple names

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, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

TraceAllEvalHook

public TraceAllEvalHook()

TraceAllEvalHook

public TraceAllEvalHook(PrintWriter pw)

Method Detail

visit

public Object visit(IJevaNode node,
                    Object data)

default method: trace all nodes. To trace less, override this method with one that simply return null;, and override the methods for the nodes you want to trace to just call return trace(node, data);

Overrides:

visit in class JevaVisitorBase

visit

public Object visit(JNELiteralExpression node,
                    Object data)

Doesn't trace literals

Overrides:

visit in class JevaVisitorBase

visit

public Object visit(JNName node,
                    Object data)

Doesn't trace simple names

Overrides:

visit in class JevaVisitorBase

trace

public Object trace(IJevaNode node,
                    Object data)

trace: prints out "->[node]" on calls, and "<-[result]" on results. keeps track of calls and results and indents appropriately.

main

public static void main(String[] ignore)

test