bugKawa - Bugs: bug #35362, endless loop + unused continuation

 
 

bug #35362: endless loop + unused continuation

Submitter:  Helmut Eller <ellerh>
Submitted:  Tue 24 Jan 2012 04:42:41 PM UTC
   
 
Category:  None Severity:  3 - Normal
Item Group:  Compile-time exception Status:  Fixed
Privacy:  Public Assigned to:  bothner
Open/Closed:  Closed
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Sat 28 Jan 2012 07:45:03 AM UTC, comment #1: 

This was a problem with the compiler not realizing the code was unreachable.

I checked in a fix.  Thanks for the bug report - I checked in the testcase, too.

Per Bothner <bothner>
Group administrator
Tue 24 Jan 2012 04:42:41 PM UTC, original submission:  

This code triggers an internal bug:

(define (foo)
  (call-with-current-continuation
   (lambda (return)
     (let l ()
       (l)))))


Kawa 1.11 (revision 7133)
Copyright (C) 2011 Per Bothner
(compiling kloop.scm to kloop)
kloop.scm:39: internal error while compiling kloop.scm
java.lang.Error: popType called with empty stack kloop.foo()java.lang.Object
        at gnu.bytecode.CodeAttr.popType(CodeAttr.java:442)
        at gnu.bytecode.CodeAttr.emitRawReturn(CodeAttr.java:2096)
        at gnu.bytecode.CodeAttr.emitReturn(CodeAttr.java:2083)
        at gnu.expr.LambdaExp.compileEnd(LambdaExp.java:565)
        at gnu.expr.LambdaExp.compileAsMethod(LambdaExp.java:1626)
        at gnu.expr.LambdaExp.compileSetField(LambdaExp.java:675)
        at gnu.expr.SetExp.compile(SetExp.java:171)
        at gnu.expr.Expression.compileNotePosition(Expression.java:156)
        at gnu.expr.Expression.compileWithPosition(Expression.java:142)
        at gnu.expr.LambdaExp.compileBody(LambdaExp.java:1649)
        at gnu.expr.Compilation.generateBytecode(Compilation.java:2041)
        at gnu.expr.Compilation.process(Compilation.java:1919)
        at gnu.expr.ModuleInfo.loadByStages(ModuleInfo.java:305)
        at gnu.expr.ModuleInfo.loadByStages(ModuleInfo.java:290)
        at kawa.repl.compileFiles(repl.java:817)
        at kawa.repl.processArgs(repl.java:444)
        at kawa.repl.main(repl.java:863)
[Exit 255]


Helmut Eller <ellerh>

 

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Depends on the following items: None found

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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2012-01-28 bothner StatusNone Fixed
        Assigned toNone bothner
        Open/ClosedOpen Closed

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