Re: AnalyzerException with ASM 3.3

It's perhaps related to that thread:
http://mail-archive.ow2.org/asm/2010-08/msg00028.html

Rémi


Le 22/10/2010 23:11, Jonathan Byrne a écrit :
> Hi ASM community, I'm using
>
> Analyzer a = new Analyzer(new SimpleVerifier(.....));
> a..analyze(....);
>
> in the 3.3 release of ASM to verify the correctness of bytecode which I
> have *not* modified. On running the above code on Java2D - the Java
> 2D demo which comes with the Sun/Oracle JDK - I get the following
> error, when validating the following method:
>
> class:
> java2d.demos.Arcs_Curves.Curves.class
>
> method:
> render (IILjava/awt/Graphics2D;)V
>
> Error:
> org.objectweb.asm.tree.analysis.AnalyzerException: Error in render at
> instruction 326: Method owner: expected Ljava/awt/Shape;, but found
> Ljava/lang/Object;
> 	at org.objectweb.asm.tree.analysis.Analyzer.analyze(Analyzer.java:291)
>
>  From the bytecode I can see why the error occurs and ASM resolves the
> value for the stack frame at 327 by grabbing the return value from the
> invokeinterface opcode.
>
> 323   --     LINENUMBER 120 L43
> 324   --     ALOAD 11
> 325  Ljava/lang/Object; --     ACONST_NULL
> 326  Ljava/lang/Object;Lnull; --     INVOKEINTERFACE
> java/awt/Shape.getPathIterator
> (Ljava/awt/geom/AffineTransform;)Ljava/awt/geom/PathIterator;
> 327  Ljava/awt/geom/PathIterator; --     ASTORE 12
>
> However, this isn't the problem I ran into, but thought I'd mention this in
> case it impacts on the error which occurs in the same method but a few
> opcodes further down. The problem is: ASM stops computing stack frames
> between 398 and 404 and I was wondering why? (Obviously I get a
> null pointer exception when I try to query the stack frame at 404).
>
> 391   --    L16
> 392   --    FRAME FULL [java2d/demos/Arcs_Curves/Curves I I
> java/awt/Graphics2D I java/awt/font/FontRenderContext
> java/awt/font/TextLayout F F I I] []
> 393   --     ILOAD 10
> 394  I --     ICONST_3
> 395  II --     IF_ICMPLT L17
> 396   --    L52
> 397 --     LINENUMBER 134 L52
> 398 --     ILOAD 2
> 399 --     ICONST_2
> 400 --     IDIV
> 401 --     BIPUSH 15
> 402 --     IADD
> 403 --     I2F
> 404 --     FSTORE 8
> 405 --    L53
> 406 --     LINENUMBER 83 L53
> 407 --     IINC 9 1
> 408   --    L13
> 409   --    FRAME FULL [java2d/demos/Arcs_Curves/Curves I I
> java/awt/Graphics2D I java/awt/font/FontRenderContext
> java/awt/font/TextLayout F F I] []
> 410   --     ILOAD 9
> 411  I --     ICONST_2
> 412  II --     IF_ICMPLT L14
> 413   --    L54
> 414 --     LINENUMBER 136 L54
> 415 --     RETURN
>
> I've attached the class file which causes the issue. And if you run
>
> java -cp asm-3.3.jar org.objectweb.asm.util.CheckClassAdapter Curves.class
>
> you can see where the stack frames are no longer computed:
>
> 00312 Curves I I Graphics2D I FontRenderContext TextLayout F F I I . .
> . .  : I  :     ICONST_3
> 00313 Curves I I Graphics2D I FontRenderContext TextLayout F F I I . .
> . .  : I I  :     IF_ICMPLT L3
> 00314 Curves I I Graphics2D I FontRenderContext TextLayout F F I I . .
> . .  :  :     ILOAD 2
> 00315 ?                          :     ICONST_2
> 00316 ?                          :     IDIV
> 00317 ?                          :     BIPUSH 15
> 00318 ?                          :     IADD
> 00319 ?                          :     I2F
> 00320 ?                          :     FSTORE 8
> 00321 ?                          :     IINC 9 1
> 00322 Curves I I Graphics2D I FontRenderContext TextLayout F F I . . .
> . .  :  :    L0
> 00323 Curves I I Graphics2D I FontRenderContext TextLayout F F I . . .
> . .  :  :    FRAME CHOP 1
> 00324 Curves I I Graphics2D I FontRenderContext TextLayout F F I . . .
> . .  :  :     ILOAD 9
> 00325 Curves I I Graphics2D I FontRenderContext TextLayout F F I . . .
> . .  : I  :     ICONST_2
> 00326 Curves I I Graphics2D I FontRenderContext TextLayout F F I . . .
> . .  : I I  :     IF_ICMPLT L1
> 00327 Curves I I Graphics2D I FontRenderContext TextLayout F F I . . .
> . .  :  :     RETURN
>
> BTW, I haven't checked to see if this error occurs in other releases of ASM.
>
> Any help would be greatly appreciated !
>
> Regards for now...
>

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