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From: "greenrd at greenrd dot org" <gcc-bugzilla@gcc.gnu.org> To: java-prs@gcc.gnu.org Subject: [Bug libgcj/17020] New: gij should ignore all reserved method flags Date: Fri, 13 Aug 2004 17:17:00 -0000 [thread overview] Message-ID: <20040813171711.17020.greenrd@greenrd.org> (raw) The JVM spec says, in section 4.6 relating to method access flags: "All bits of the access_flags item not assigned in Table 4.5 are reserved for future use. They should be set to zero in generated class files and should be ignored by Java virtual machine implementations." [0] However, gij does not follow this spec. It contains this code in libjava/defineclass.cc : 1253 if (method->accflags & (Modifier::VOLATILE 1254 | Modifier::TRANSIENT 1255 | Modifier::INTERFACE)) 1256 throw_class_format_error ("erroneous method access flags"); This becomes a problem when a method using covariant return types is compiled by JDK 1.5 beta, passed through Retroweaver[1] to make it "Java 1.4-bytecode-compatible", and then run by gij - because Retroweaver sometimes/always leaves the undocumented 0x40 flag set for covariant bridge methods. (0x40 is interpreted by gcj as VOLATILE, but 0x40 is not in Table 4.5 in the spec, so it should not be rejected by gij.) Although probably Retroweaver shouldn't do that (and I'll file a bug against Retroweaver about that), gij should still accept it when it does. [0] http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html#1513 [1] http://retroweaver.sourceforge.net/ -- Summary: gij should ignore all reserved method flags Product: gcc Version: 3.4.1 Status: UNCONFIRMED Severity: minor Priority: P2 Component: libgcj AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: greenrd at greenrd dot org CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17020
next reply other threads:[~2004-08-13 17:17 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-08-13 17:17 greenrd at greenrd dot org [this message] 2004-08-13 17:28 ` [Bug libgcj/17020] " pinskia at gcc dot gnu dot org 2004-08-13 18:26 ` cvs-commit at gcc dot gnu dot org 2004-08-13 18:26 ` mckinlay at redhat dot com
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