Description Thierry Beucher 2011-09-22 19:09:48 EDT

Build Identifier: 20110218-0911

symptom :

org.eclipse.m2m.atl.engine.emfvm.VMException: 100
	at __applyRefiningTrace__#47(plapiRefine_2.atl)
		local variables: self=plapiRefine_2 : ASMModule
	at main#56(plapiRefine_2.atl)
		local variables: self=plapiRefine_2 : ASMModule
Java Stack:
org.eclipse.m2m.atl.engine.emfvm.VMException: 100
	at org.eclipse.m2m.atl.engine.emfvm.ASMOperation.exec(ASMOperation.java:647)
	at org.eclipse.m2m.atl.engine.emfvm.ASMOperation.exec(ASMOperation.java:389)
	at org.eclipse.m2m.atl.engine.emfvm.ASM.run(ASM.java:208)
	at org.eclipse.m2m.atl.engine.emfvm.launch.EMFVMLauncher.internalLaunch(EMFVMLauncher.java:170)
	at org.eclipse.m2m.atl.engine.emfvm.launch.EMFVMUILauncher.launch(EMFVMUILauncher.java:46)
	at org.eclipse.m2m.atl.core.service.LauncherService.launch(LauncherService.java:136)
	at org.eclipse.m2m.atl.core.ui.launch.AtlLaunchConfigurationDelegate.launchOrDebug(AtlLaunchConfigurationDelegate.java:300)
	at org.eclipse.m2m.atl.core.ui.launch.AtlLaunchConfigurationDelegate.launch(AtlLaunchConfigurationDelegate.java:234)
	at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:853)
	at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:702)
	at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:924)
	at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1128)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 100
	at org.eclipse.m2m.atl.engine.emfvm.ASMOperation.exec(ASMOperation.java:495)
	... 12 more

This exception occurs only for refining mode transformation with new atl2010 compiler BUT NOT with atl2006, which denote propably a regression bug.

My ATL version is 3.2.1

ATL internal stack is limited in depth to 100 items implemented as an array of Object. 

The stack depth increase continuously: see below the trace displayed preceeding the exception :

(I added "println" in source code of org.eclipse.m2m.atl.engine.emfvm.ASMOperation
...
  try {
    while (pc < nbBytecodes) {
      System.out.println("---stack="+fp);
      Bytecode bytecode = bytecodes[pc++];
...)

resulting trace :

...
---stack=96
---stack=97
---stack=97
---stack=97
---stack=96
---stack=97
---stack=98
---stack=98
---stack=98
---stack=97
---stack=98
---stack=99
---stack=99
---stack=99
---stack=98
---stack=99
---stack=100
---stack=100
---stack=100
---stack=99
---stack=100

More, it seems that, unlike with atl2006, each rule execution let the stack in non-empty state. And the exception may occurs or not depending on the number of rules in the transformation (in my case, setting MAX_STACK = 10000 instead of 100, the depth reached 205 with 3 rules)

Nevertheless, I think the problem is more likely located in asm file produced with atl2010 compiler.

Reproducible: Always