Re: objc/3822: gcc crashes when compiling class that contains bitfield with enums

Re: objc/3822: gcc crashes when compiling class that contains bitfield with enums

[sayle]

Synopsis: gcc crashes when compiling class that contains bitfield with enums

State-Changed-From-To: open->closed
State-Changed-By: sayle
State-Changed-When: Wed Jul  3 06:13:40 2002
State-Changed-Why:
    This PR has been fixed by Nicola Pero's 12 Dec 2001 patch.
    I've confirmed that the ICE is no longer present on mainline.
    
    Wed Dec 12 08:35:33 2001  Nicola Pero  <n.pero@mi.flashnet.it>
    
            * objc/objc-act.c (encode_complete_bitfield): Fixed encoding
            enumeral types - encode them using 'i'.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3822

objc/3822: gcc crashes when compiling class that contains bitfield with enums

[woudshoo]

>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: