It's most likely a bug, but I'll let Norris comment on that -- for  
every basic block in a class bytecode of a method, all code paths  
entering it must produce a stack of same depth (and also arguments of  
the same type); the verifier naturally enforces this.

The stack trace ain't too helpful here -- if you could submit a JS  
script whose compilation triggers this, that'd help.

Attila.

On Aug 30, 2008, at 7:31 AM, Matthieu Riou wrote:

> Hi,
>
> I'm getting a java.lang.VerifyError in Rhino, executing a middle sized
> set of Javascript scripts. It's a bit hard to isolate where exactly it
> happens but if the stacktrace helps you narrowing it down, I could
> give it a try. I should also add that it doesn't happen with -opt -1
> (which is logical as it seems to be in the compiler).
>
> Let me know if I should file a bug in Bugzilla.
>
> Thanks,
> Matthieu
>
> Exception in thread "main" java.lang.VerifyError: (class: org/mozilla/
> javascript/gen/c1, method: _c0 signature: (Lorg/mozilla/javascript/ 
> gen/
> c1;Lorg/mozilla/javascript/Context;Lorg/mozilla/javascript/
> Scriptable;Lorg/mozilla/javascript/Scriptable;[Ljava/lang/
> Object;)Ljava/lang/Object;) Inconsistent stack height 1 != 0
>       at java.lang.Class.getDeclaredConstructors0(Native Method)
>       at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
>       at java.lang.Class.getConstructor0(Class.java:2699)
>       at java.lang.Class.newInstance0(Class.java:326)
>       at java.lang.Class.newInstance(Class.java:308)
>       at
> org 
> .mozilla.javascript.optimizer.Codegen.createScriptObject(Codegen.java:
> 105)
>       at org.mozilla.javascript.Context.compileImpl(Context.java:2409)
>       at org.mozilla.javascript.Context.compileString(Context.java:1359)
>       at org.mozilla.javascript.Context.compileString(Context.java:1348)
>       at
> org 
> .mozilla.javascript.tools.shell.Main.loadScriptFromSource(Main.java:
> 456)
>       at
> org.mozilla.javascript.tools.shell.Main.processFileSecure(Main.java:
> 444)
>       at org.mozilla.javascript.tools.shell.Main.processFile(Main.java:413)
>       at org.mozilla.javascript.tools.shell.Main.processSource(Main.java:
> 404)
>       at org.mozilla.javascript.tools.shell.Main.processFiles(Main.java:
> 179)
>       at org.mozilla.javascript.tools.shell.Main$IProxy.run(Main.java:100)
>       at org.mozilla.javascript.Context.call(Context.java:515)
>       at org.mozilla.javascript.ContextFactory.call(ContextFactory.java:
> 507)
>       at org.mozilla.javascript.tools.shell.Main.exec(Main.java:162)
>       at org.mozilla.javascript.tools.shell.Main.main(Main.java:140)

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