AssertionError during LVT generation with javac 8u20

[Vicente-Arturo Romero-Zaldivar]

Hi Liam,

On 10/08/2014 05:55 PM, Liam Miller-Cushon wrote:
> Thanks Vicente, I meant to test against JDK 9 but clearly did not. 
> Sorry for the duplicate.

np

>
> It turns out that I actually ran into JDK-8058708, and while trying to 
> make a smaller test case I produced a repro for JDK-8047719 instead. 
> This patch fixed the issue we were seeing: 
> http://hg.openjdk.java.net/jdk8u/jdk8u-dev/langtools/rev/31d2a837676f

Some background on LVT generation bugs:

Actually there have been some LVT generation bugs lately. Most of them 
corner cases that may appear in large projects, at least this is my 
feeling. We have tried to detect, and create regression tests, for most 
of these special cases. We have left assertions for those that may leak, 
even when this might provoke a crash but anyway a wrong LVT will provoke 
a crash sooner or later. So we really appreciate LVT generation bug 
reports, as in other areas of course.

Thanks,
Vicente

>
> On Wed, Oct 8, 2014 at 2:01 PM, Vicente-Arturo Romero-Zaldivar 
> <vicente.romero at oracle.com <mailto:vicente.romero at oracle.com>> wrote:
>
>     Hi Liam,
>
>     Thanks for your mail and for the reduced test case. The issue you
>     are reporting has already been fixed in JDK 9 [1] and JDK 8udev
>     [2]. This was targeted by the fix for bug [3] also backported into
>     8udev see [4]. The corresponding changeset can be found at [5].
>
>     Thanks,
>     Vicente
>
>     [1] http://hg.openjdk.java.net/jdk9/dev/
>     [2] http://hg.openjdk.java.net/jdk8u/jdk8u-dev/
>     [3] https://bugs.openjdk.java.net/browse/JDK-8047719
>     [4] https://bugs.openjdk.java.net/browse/JDK-8048587
>     [5] http://hg.openjdk.java.net/jdk9/jdk9/langtools/rev/855f8c7337eb
>
>
>     On 10/08/2014 11:03 AM, Liam Miller-Cushon wrote:
>>     It looks like the fix for JDK-8037937 introduced a different
>>     LVT-related AssertionError. The crash bisects down to
>>     http://hg.openjdk.java.net/jdk8u/jdk8u/langtools/rev/372fd7283bf0
>>
>>     Repro:
>>
>>     === Test.java ===
>>     public class Test {
>>       void m(Object[] xs) {
>>         {
>>           Object[] ys;
>>           int i;
>>
>>           for (Object x : xs) {
>>           }
>>
>>           if (xs != null) {
>>             i = 0;
>>           }
>>         }
>>       }
>>     }
>>     ===
>>
>>     $ javac -g Test.java
>>     An exception has occurred in the compiler (1.8.0_20). Please file
>>     a bug at the Java Developer Connection
>>     (http://java.sun.com/webapps/bugreport)  after checking the Bug
>>     Parade for duplicates. Include your program and the following
>>     diagnostic in your report.  Thank you.
>>     java.lang.AssertionError
>>     at com.sun.tools.javac.util.Assert.error(Assert.java:126)
>>     at com.sun.tools.javac.util.Assert.check(Assert.java:45)
>>     at
>>     com.sun.tools.javac.jvm.ClassWriter.writeCode(ClassWriter.java:1189)
>>     at
>>     com.sun.tools.javac.jvm.ClassWriter.writeMethod(ClassWriter.java:1110)
>>     at
>>     com.sun.tools.javac.jvm.ClassWriter.writeMethods(ClassWriter.java:1602)
>>     at
>>     com.sun.tools.javac.jvm.ClassWriter.writeClassFile(ClassWriter.java:1692)
>>     at
>>     com.sun.tools.javac.jvm.ClassWriter.writeClass(ClassWriter.java:1620)
>>     at
>>     com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:746)
>>     at
>>     com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1572)
>>     at
>>     com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1536)
>>     at
>>     com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)
>>     at
>>     com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
>>     at com.sun.tools.javac.main.Main.compile(Main.java:523)
>>     at com.sun.tools.javac.main.Main.compile(Main.java:381)
>>     at com.sun.tools.javac.main.Main.compile(Main.java:370)
>>     at com.sun.tools.javac.main.Main.compile(Main.java:361)
>>     at com.sun.tools.javac.Main.compile(Main.java:56)
>>     at com.sun.tools.javac.Main.main(Main.java:42)
>>
>
>

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