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From: Andreas Lenz <andreas.lenz@handy-games.com> To: gcc-gnats@gcc.gnu.org Subject: java/5361: gcj bug Date: Fri, 11 Jan 2002 10:16:00 -0000 [thread overview] Message-ID: <200201111809.g0BI94e09824@Twisty.local> (raw) >Number: 5361 >Category: java >Synopsis: ArrayIndexOutOfBounds where it should not be >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Fri Jan 11 10:16:01 PST 2002 >Closed-Date: >Last-Modified: >Originator: >Release: 3.0.3 >Organization: >Environment: System: Linux Twisty 2.4.0 #5 Mit Mai 30 16:05:26 CEST 2001 i686 unknown Architecture: i686 host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: i686-pc-linux-gnu configured with: ./configure >Description: java code: public void function(byte[] dst,...) { int tmp; byte dst_byte; ... copmuting tmp, tmp is in range 0x0000 to 0xffff ... // here is // dst.length = 2 // dst_byte = 0 dst[dst_byte] |= (tmp>>8); << (1) works dst[++dst_byte] |= (tmp & 0xff); << (2) dst_byte is now 2 !! } compiled with kaffe javac fails ! compiled with sun javac works ! changing (2) to ++dst_byte;dst[dst_byte] != (tmp & 0xff); works ! dst_byte changes from 0 to 2 this also happens, if the array has more elements, the last access fails, if dst.length == 5 dst_byte switches from 4 to 6 !! The code is executed in a modified, commercial java2 MicroEdition I'm not sure, if the gcj is correct and the bug is in the VM, as the bug also occurs with the kaffe compiler Well, I think the bug is most likely in the VM, but strange nevertheless... Best Regards Andi >How-To-Repeat: repeats every time >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-01-11 18:16 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-01-11 10:16 Andreas Lenz [this message] 2002-01-11 10:26 Alexandre Petit-Bianco 2002-01-11 10:56 Tom Tromey
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