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PR java/25535: gcj broken on 64-bit big-endian systems
- From: Andrew Haley <aph at redhat dot com>
- To: java-patches at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
- Date: Thu, 22 Dec 2005 17:23:19 +0000
- Subject: PR java/25535: gcj broken on 64-bit big-endian systems
BC-compiled code doesn't work on a big-endian 64-bit box because of a
silly mistake initializing entries in the constant pool. In all cases
the initializer must appear as the first 32-bit integer of a machine
word stored in memory.
Here's a testcase:
public class Test {
public static void main(String[] args) {
System.out.println(javax.rmi.CORBA.Stub.class);
}
}
This fails with a SEGV on PPC 64.
Andrew.
2005-12-22 Andrew Haley <aph@redhat.com>
PR java/25535
* constants.c (build_constants_constructor): move initializer into
first halfword on a 6-bit big-endian machine.
Index: constants.c
===================================================================
--- constants.c (revision 108907)
+++ constants.c (working copy)
@@ -481,7 +481,12 @@
case CONSTANT_Fieldref:
case CONSTANT_NameAndType:
{
- jword temp = outgoing_cpool->data[i].w;
+ unsigned HOST_WIDE_INT temp = outgoing_cpool->data[i].w;
+
+ /* Make sure that on a 64-bit big-endian machine this 32-bit
+ jint appears in the first word. */
+ if (BYTES_BIG_ENDIAN && BITS_PER_WORD > 32)
+ temp <<= BITS_PER_WORD - 32;
tags_list
= tree_cons (NULL_TREE,