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From: <jmr@fulcrummicro.com> To: gcc-gnats@gcc.gnu.org Subject: java/7482: gij verify error Date: Sat, 03 Aug 2002 16:56:00 -0000 [thread overview] Message-ID: <200208032348.g73Nm8H20028@churchill.internal.avlsi.com> (raw) >Number: 7482 >Category: java >Synopsis: gij verify error >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: rejects-legal >Submitter-Id: net >Arrival-Date: Sat Aug 03 16:56:00 PDT 2002 >Closed-Date: >Last-Modified: >Originator: jmr@fulcrummicro.com >Release: 3.3 20020801 (experimental) >Organization: >Environment: System: Linux churchill 2.4.3-12 #1 Fri Jun 8 15:05:56 EDT 2001 i686 unknown Architecture: i686 host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: ../gcc/configure --enable-threads=posix --prefix=/home/user/jmr/app/gcc --enable-shared --enable-languages=c++,java : (reconfigured) >Description: The gij verifier erroneously gives an error when run on the class file resulting from the following code: X.java: public class X { private interface I { } private static class U implements I { } private static class V implements I { } private static I g(Object o) { I i; if (o == null) i = new U(); else i = new V(); return i; } public static void main(String[] args) { System.out.println(g(null)); } } It will also fail if the inner classes are put in their own files, so it's not an issue with inner classes. I tried all four combinations of compiling the .java with gcj / Sun's javac, and interpreting with gij / Sun's java. It failed in both gij cases, but neither of the java cases, so I'm assuming that the .class generation is ok on the part of both compilers. >How-To-Repeat: ; gcj -C -v X.java Reading specs from /home/user/jmr/app/gcc/lib/gcc-lib/i686-pc-linux-gnu/3.3/specs Configured with: ../gcc/configure --enable-threads=posix --prefix=/home/user/jmr/app/gcc --enable-shared --enable-languages=c++,java : (reconfigured) Thread model: posix gcc version 3.3 20020801 (experimental) /home/user/jmr/app/gcc/lib/gcc-lib/i686-pc-linux-gnu/3.3/jc1 X.java -quiet -dumpbase X.java -g1 -version -fsyntax-only -femit-class-files -o /dev/null GNU Java version 3.3 20020801 (experimental) (i686-pc-linux-gnu) compiled by GNU C version 3.2 20020713 (experimental). Class path starts here: ./ /home/user/jmr/app/gcc/share/java/libgcj-3.3.jar/ (system) (zip) ; gij X Exception in thread "main" java.lang.VerifyError: verification failed at PC 24 in X:g((Ljava.lang.Object;)LX$I;): incompatible return type at java.lang.Throwable.Throwable(java.lang.String) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.Error.Error(java.lang.String) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.LinkageError.LinkageError(java.lang.String) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.VerifyError.VerifyError(java.lang.String) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at _Jv_BytecodeVerifier.verify_fail(byte, int) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at _Jv_BytecodeVerifier.verify_instructions_0() (/home/user/jmr/app/gcc/lib/libgcj.so.3) at _Jv_VerifyMethod(_Jv_InterpMethod) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at _Jv_PrepareClass(java.lang.Class) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.ClassLoader.linkClass0(java.lang.Class) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.ClassLoader.resolveClass0(java.lang.Class) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.Class.initializeClass() (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at java.lang.Class.forName(java.lang.String) (/home/user/jmr/app/gcc/lib/libgcj.so.3) at gnu.gcj.runtime.FirstThread.run() (/home/user/jmr/app/gcc/lib/libgcj.so.3) at _Jv_ThreadRun(java.lang.Thread) (/home/user/jmr/app/gcc/lib/libgcj.so.3) ; gij --version gij (GNU libgcj) version 3.3 20020801 (experimental) Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. >Fix: In this case, a workaround is to write if (o == null) return new U(); else return new V(); instead. There may be more complex examples where coding around the problem isn't as easy. >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-08-03 23:56 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-08-03 16:56 jmr [this message] 2002-08-12 16:43 Tom Tromey
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