objc/3822: gcc crashes when compiling class that contains bitfield with enums
woudshoo@xs4all.nl
woudshoo@xs4all.nl
Wed Jul 25 13:46:00 GMT 2001
>Number: 3822
>Category: objc
>Synopsis: gcc crashes when compiling class that contains bitfield with enums
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Jul 25 13:46:04 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: woudshoo@xs4all.nl
>Release: gcc version 3.0
>Organization:
>Environment:
Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.0/specs
Configured with: ../gcc-3.0/configure --prefix=/usr --with-threads=posix : (reconfigured) ../gcc-3.0/configure --prefix=/usr --enable-threads
Thread model: posix
>Description:
compiling a class that contains a enum bitfield type crashes with the following error message (See source in How-To-Repeat):
PROMPT> gcc bugsource.m
bugsource.m:20: Internal compiler error in encode_complete_bitfield, at objc/objc-act.c:6879
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.
>How-To-Repeat:
typedef enum
{
a, b
} countingType;
@interface Test
{
struct {
countingType x : 3;
} i;
}
@end
@implementation Test
@end
int main (void)
{
return 1;
}
>Fix:
Workaround: Do not use enum bitfields.
Partial fix: Apply the patch below following diff to objc/objc-act.c. Two remarks:
- I have no idea if this is a correct fix.
- If the fix is correct, it probably should also be applied to
encode_type and perhaps a few other places
-------------
*** gcc/objc/objc-act-orig.c Wed Jul 25 21:54:56 2001
--- gcc/objc/objc-act.c Wed Jul 25 21:55:50 2001
***************
*** 6830,6840 ****
static void
encode_complete_bitfield (int position, tree type, int size)
{
- enum tree_code code = TREE_CODE (type);
char buffer[40];
char charType = '?';
! if (code == INTEGER_TYPE)
{
if (integer_zerop (TYPE_MIN_VALUE (type)))
{
--- 6830,6839 ----
static void
encode_complete_bitfield (int position, tree type, int size)
{
char buffer[40];
char charType = '?';
! if (INTEGRAL_TYPE_P (type))
{
if (integer_zerop (TYPE_MIN_VALUE (type)))
{
***************
*** 6853,6858 ****
--- 6852,6859 ----
}
else if (TYPE_MODE (type) == DImode)
charType = 'Q';
+ else
+ abort ();
}
else
***************
*** 6872,6877 ****
--- 6873,6880 ----
else if (TYPE_MODE (type) == DImode)
charType = 'q';
+ else
+ abort ();
}
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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