This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
cc1 core dump (egcs 2.96 dated 12th February 1999)
- To: bug-gcc at gnu dot org
- Subject: cc1 core dump (egcs 2.96 dated 12th February 1999)
- From: Duncan Simpson <dps at io dot stargate dot co dot uk>
- Date: Sun, 13 Feb 2000 00:39:29 GMT
Invalid types in a structure can cause cc1 to die when you refer to
members of the structure. A minimal test program is
#include <stdio.h>
int main(void)
{
struct { char x; undefined type y; } v;
#if 0
FILE *f=fopen("conftestval", "w");
int d;
if (!f) exit(1);
#endif
d=((unsigned char *) &v.y)-((unsigned char *) &v.x);
#if 0
if (d<0) { d=-d; }
fprintf(f, "%d\n", d);
exit(0);
#endif
}
The bug appears to be parsing a dud pointer to comptypes (or gdb
suggests it)
bash-2.02$ /usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/cpp -lang-c -v -D__GNUC__=2 -D__GNUC_MINOR__=96 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem\(posix\) -g -Acpu\(i386\) -Amachine\(i386\) -Di386 -D__i386 -D__i386__ -D__tune_pentiumpro__ out.c -o /tmp/out.i
GNU CPP version 2.96 20000211 (experimental) (cpplib)
(i386 Linux/ELF)
out.c:4: warning: no semicolon at end of struct or union
out.c: At top level:
out.c:4: warning: data definition has no type or storage class
out.c:10: request for member `y' in something not a structure or union
out.c:10: request for member `x' in something not a structure or union
Program received signal SIGSEGV, Segmentation fault.
0x81e8427 in comptypes (type1=0x6e692074, type2=0x40019400) at c-typeck.c:434
434 if (t1 == t2 || !t1 || !t2
(gdb) bt
#0 0x81e8427 in comptypes (type1=0x6e692074, type2=0x40019400)
at c-typeck.c:434
#1 0x81ed913 in digest_init (type=0x40019400, init=0x40133220,
require_constant=1, constructor_constant=1) at c-typeck.c:4627
#2 0x81ed35f in store_init_value (decl=0x40131e80, init=0x40133220)
at c-typeck.c:4321
#3 0x81e3ef9 in finish_decl (decl=0x40131e80, init=0x40133220,
asmspec_tree=0x0) at c-decl.c:3424
#4 0x81d9bfe in yyparse () at c-parse.y:1013
#5 0x804bad4 in compile_file (name=0x40104e40 "/tmp/out.i") at toplev.c:2374
#6 0x804f31b in main (argc=9, argv=0xbffffc14) at toplev.c:4769
(gdb) print *t1
Cannot access memory at address 0x6e692074.
(gdb) quit
The output of cpp is
# 1 "out.c"
# 1 "/usr/include/stdio.h" 1 3
# 18 "/usr/include/stdio.h" 3
# 1 "/usr/local/include/features.h" 1 3
# 18 "/usr/local/include/features.h" 3
# 79 "/usr/local/include/features.h" 3
# 137 "/usr/local/include/features.h" 3
# 195 "/usr/local/include/features.h" 3
# 1 "/usr/include/sys/cdefs.h" 1 3
# 18 "/usr/include/sys/cdefs.h" 3
# 71 "/usr/include/sys/cdefs.h" 3
# 103 "/usr/include/sys/cdefs.h" 3
# 124 "/usr/include/sys/cdefs.h" 3
# 249 "/usr/local/include/features.h" 2 3
# 1 "/usr/include/gnu/stubs.h" 1 3
# 277 "/usr/local/include/features.h" 2 3
# 27 "/usr/include/stdio.h" 2 3
# 1 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 1 3
# 19 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 48 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 90 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 160 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
typedef unsigned int size_t;
# 296 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 308 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 341 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 33 "/usr/include/stdio.h" 2 3
# 1 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stdarg.h" 1 3
# 19 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stdarg.h" 3
typedef __builtin_va_list __gnuc_va_list;
# 135 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stdarg.h" 3
# 38 "/usr/include/stdio.h" 2 3
# 1 "/usr/include/bits/types.h" 1 3
# 18 "/usr/include/bits/types.h" 3
# 1 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 1 3
# 19 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 48 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 90 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 160 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 217 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 296 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 308 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 341 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 29 "/usr/include/bits/types.h" 2 3
typedef unsigned char __u_char;
typedef unsigned short __u_short;
typedef unsigned int __u_int;
typedef unsigned long __u_long;
__extension__ typedef unsigned long long int __u_quad_t;
__extension__ typedef long long int __quad_t;
# 48 "/usr/include/bits/types.h" 3
typedef signed char __int8_t;
typedef unsigned char __uint8_t;
typedef signed short int __int16_t;
typedef unsigned short int __uint16_t;
typedef signed int __int32_t;
typedef unsigned int __uint32_t;
__extension__ typedef signed long long int __int64_t;
__extension__ typedef unsigned long long int __uint64_t;
typedef __quad_t *__qaddr_t;
typedef __u_quad_t __dev_t;
typedef __u_int __uid_t;
typedef __u_int __gid_t;
typedef __u_long __ino_t;
typedef __u_int __mode_t;
typedef __u_int __nlink_t;
typedef long int __off_t;
typedef __quad_t __loff_t;
typedef int __pid_t;
typedef int __ssize_t;
typedef long int __rlim_t;
typedef __quad_t __rlim64_t;
typedef __u_int __id_t;
typedef struct
{
int __val[2];
} __fsid_t;
typedef int __daddr_t;
typedef char *__caddr_t;
typedef long int __time_t;
typedef long int __swblk_t;
typedef long int __clock_t;
typedef unsigned long int __fd_mask;
typedef struct
{
__fd_mask __fds_bits[1024 / (8 * sizeof (__fd_mask))];
} __fd_set;
typedef int __key_t;
typedef unsigned short int __ipc_pid_t;
typedef long int __blkcnt_t;
typedef __quad_t __blkcnt64_t;
typedef __u_long __fsblkcnt_t;
typedef __u_quad_t __fsblkcnt64_t;
typedef __u_long __fsfilcnt_t;
typedef __u_quad_t __fsfilcnt64_t;
typedef __u_long __ino64_t;
typedef __loff_t __off64_t;
typedef int __t_scalar_t;
typedef unsigned int __t_uscalar_t;
typedef int __intptr_t;
# 40 "/usr/include/stdio.h" 2 3
typedef struct _IO_FILE FILE;
# 1 "/usr/include/libio.h" 1 3
# 26 "/usr/include/libio.h" 3
# 1 "/usr/include/_G_config.h" 1 3
# 1 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 1 3
# 19 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 48 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 90 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 160 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 217 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 267 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
typedef long int wchar_t;
typedef unsigned int wint_t;
# 341 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stddef.h" 3
# 14 "/usr/include/_G_config.h" 2 3
typedef int _G_int16_t __attribute__ ((__mode__ (__HI__)));
typedef int _G_int32_t __attribute__ ((__mode__ (__SI__)));
typedef unsigned int _G_uint16_t __attribute__ ((__mode__ (__HI__)));
typedef unsigned int _G_uint32_t __attribute__ ((__mode__ (__SI__)));
# 30 "/usr/include/libio.h" 2 3
# 1 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stdarg.h" 1 3
# 19 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stdarg.h" 3
# 135 "/usr/lib/gcc-lib/i686-pc-linux-gnu/2.96/include/stdarg.h" 3
# 48 "/usr/include/libio.h" 2 3
# 67 "/usr/include/libio.h" 3
# 98 "/usr/include/libio.h" 3
struct _IO_jump_t; struct _IO_FILE;
typedef void _IO_lock_t;
struct _IO_marker {
struct _IO_marker *_next;
struct _IO_FILE *_sbuf;
int _pos;
# 186 "/usr/include/libio.h" 3
};
struct _IO_FILE {
int _flags;
char* _IO_read_ptr;
char* _IO_read_end;
char* _IO_read_base;
char* _IO_write_base;
char* _IO_write_ptr;
char* _IO_write_end;
char* _IO_buf_base;
char* _IO_buf_end;
char *_IO_save_base;
char *_IO_backup_base;
char *_IO_save_end;
struct _IO_marker *_markers;
struct _IO_FILE *_chain;
int _fileno;
int _blksize;
__off_t _old_offset;
unsigned short _cur_column;
signed char _vtable_offset;
char _shortbuf[1];
_IO_lock_t *_lock;
__off64_t _offset;
int _unused2[16];
};
typedef struct _IO_FILE _IO_FILE;
struct _IO_FILE_plus;
extern struct _IO_FILE_plus _IO_2_1_stdin_;
extern struct _IO_FILE_plus _IO_2_1_stdout_;
extern struct _IO_FILE_plus _IO_2_1_stderr_;
typedef __ssize_t __io_read_fn (void * __cookie, char *__buf,
size_t __nbytes);
# 264 "/usr/include/libio.h" 3
typedef __ssize_t __io_write_fn (void * __cookie, __const char *__buf,
size_t __n);
# 273 "/usr/include/libio.h" 3
typedef int __io_seek_fn (void * __cookie, __off_t __pos, int __w);
typedef int __io_close_fn (void * __cookie);
# 311 "/usr/include/libio.h" 3
extern int __underflow (_IO_FILE *) ;
extern int __uflow (_IO_FILE *) ;
extern int __overflow (_IO_FILE *, int) ;
extern int _IO_getc (_IO_FILE *__fp) ;
extern int _IO_putc (int __c, _IO_FILE *__fp) ;
extern int _IO_feof (_IO_FILE *__fp) ;
extern int _IO_ferror (_IO_FILE *__fp) ;
extern int _IO_peekc_locked (_IO_FILE *__fp) ;
extern void _IO_flockfile (_IO_FILE *) ;
extern void _IO_funlockfile (_IO_FILE *) ;
extern int _IO_ftrylockfile (_IO_FILE *) ;
extern int _IO_vfscanf (_IO_FILE * __restrict, const char * __restrict,
__gnuc_va_list, int *__restrict) ;
# 365 "/usr/include/libio.h" 3
extern int _IO_vfprintf (_IO_FILE *__restrict, const char *__restrict,
__gnuc_va_list) ;
# 367 "/usr/include/libio.h" 3
extern __ssize_t _IO_padn (_IO_FILE *, int, __ssize_t) ;
extern size_t _IO_sgetn (_IO_FILE *, void *, size_t) ;
extern __off64_t _IO_seekoff (_IO_FILE *, __off64_t, int, int) ;
extern __off64_t _IO_seekpos (_IO_FILE *, __off64_t, int) ;
extern void _IO_free_backup_area (_IO_FILE *) ;
# 57 "/usr/include/stdio.h" 2 3
typedef __off_t fpos_t;
# 110 "/usr/include/stdio.h" 3
# 1 "/usr/include/bits/stdio_lim.h" 1 3
# 18 "/usr/include/bits/stdio_lim.h" 3
# 110 "/usr/include/stdio.h" 2 3
extern FILE *stdin;
extern FILE *stdout;
extern FILE *stderr;
extern int remove (__const char *__filename) ;
extern int rename (__const char *__old, __const char *__new) ;
extern FILE *tmpfile (void) ;
extern char *tmpnam (char *__s) ;
extern char *tmpnam_r (char *__s) ;
extern char *tempnam (__const char *__dir, __const char *__pfx) ;
extern int fclose (FILE *__stream) ;
extern int fflush (FILE *__stream) ;
extern int fflush_unlocked (FILE *__stream) ;
extern FILE *fopen (__const char *__restrict __filename,
__const char *__restrict __modes) ;
# 180 "/usr/include/stdio.h" 3
extern FILE *freopen (__const char *__restrict __filename,
__const char *__restrict __modes,
FILE *__restrict __stream) ;
# 184 "/usr/include/stdio.h" 3
# 197 "/usr/include/stdio.h" 3
extern FILE *fdopen (int __fd, __const char *__modes) ;
# 223 "/usr/include/stdio.h" 3
extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) ;
extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
int __modes, size_t __n) ;
# 234 "/usr/include/stdio.h" 3
extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
size_t __size) ;
# 240 "/usr/include/stdio.h" 3
extern void setlinebuf (FILE *__stream) ;
extern int fprintf (FILE *__restrict __stream,
__const char *__restrict __format, ...) ;
# 249 "/usr/include/stdio.h" 3
extern int printf (__const char *__restrict __format, ...) ;
extern int sprintf (char *__restrict __s,
__const char *__restrict __format, ...) ;
# 254 "/usr/include/stdio.h" 3
extern int vfprintf (FILE *__restrict __s,
__const char *__restrict __format,
__gnuc_va_list __arg) ;
# 259 "/usr/include/stdio.h" 3
extern int vprintf (__const char *__restrict __format,
__gnuc_va_list __arg) ;
# 262 "/usr/include/stdio.h" 3
extern int vsprintf (char *__restrict __s,
__const char *__restrict __format,
__gnuc_va_list __arg) ;
# 266 "/usr/include/stdio.h" 3
extern int snprintf (char *__restrict __s, size_t __maxlen,
__const char *__restrict __format, ...)
# 271 "/usr/include/stdio.h" 3
__attribute__ ((__format__ (__printf__, 3, 4)));
extern int __vsnprintf (char *__restrict __s, size_t __maxlen,
__const char *__restrict __format,
__gnuc_va_list __arg)
# 276 "/usr/include/stdio.h" 3
__attribute__ ((__format__ (__printf__, 3, 0)));
extern int vsnprintf (char *__restrict __s, size_t __maxlen,
__const char *__restrict __format,
__gnuc_va_list __arg)
# 280 "/usr/include/stdio.h" 3
__attribute__ ((__format__ (__printf__, 3, 0)));
# 302 "/usr/include/stdio.h" 3
extern int fscanf (FILE *__restrict __stream,
__const char *__restrict __format, ...) ;
# 308 "/usr/include/stdio.h" 3
extern int scanf (__const char *__restrict __format, ...) ;
extern int sscanf (__const char *__restrict __s,
__const char *__restrict __format, ...) ;
# 313 "/usr/include/stdio.h" 3
# 330 "/usr/include/stdio.h" 3
extern int fgetc (FILE *__stream) ;
extern int getc (FILE *__stream) ;
extern int getchar (void) ;
extern int getc_unlocked (FILE *__stream) ;
extern int getchar_unlocked (void) ;
extern int fgetc_unlocked (FILE *__stream) ;
extern int fputc (int __c, FILE *__stream) ;
extern int putc (int __c, FILE *__stream) ;
extern int putchar (int __c) ;
extern int fputc_unlocked (int __c, FILE *__stream) ;
extern int putc_unlocked (int __c, FILE *__stream) ;
extern int putchar_unlocked (int __c) ;
extern int getw (FILE *__stream) ;
extern int putw (int __w, FILE *__stream) ;
extern char *fgets (char *__restrict __s, int __n,
FILE *__restrict __stream) ;
# 391 "/usr/include/stdio.h" 3
extern char *gets (char *__s) ;
# 420 "/usr/include/stdio.h" 3
extern int fputs (__const char *__restrict __s,
FILE *__restrict __stream) ;
# 426 "/usr/include/stdio.h" 3
extern int puts (__const char *__s) ;
extern int ungetc (int __c, FILE *__stream) ;
extern size_t fread (void *__restrict __ptr, size_t __size,
size_t __n, FILE *__restrict __stream) ;
# 444 "/usr/include/stdio.h" 3
extern size_t fwrite (__const void *__restrict __ptr, size_t __size,
size_t __n, FILE *__restrict __s) ;
# 447 "/usr/include/stdio.h" 3
extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
size_t __n, FILE *__restrict __stream) ;
# 452 "/usr/include/stdio.h" 3
extern size_t fwrite_unlocked (__const void *__restrict __ptr,
size_t __size, size_t __n,
FILE *__restrict __stream) ;
# 455 "/usr/include/stdio.h" 3
extern int fseek (FILE *__stream, long int __off, int __whence) ;
extern long int ftell (FILE *__stream) ;
extern void rewind (FILE *__stream) ;
typedef __off_t off_t;
extern int fgetpos (FILE *__restrict __stream,
fpos_t *__restrict __pos) ;
# 497 "/usr/include/stdio.h" 3
extern int fsetpos (FILE *__stream, __const fpos_t *__pos) ;
# 519 "/usr/include/stdio.h" 3
# 529 "/usr/include/stdio.h" 3
extern void clearerr (FILE *__stream) ;
extern int feof (FILE *__stream) ;
extern int ferror (FILE *__stream) ;
extern void clearerr_unlocked (FILE *__stream) ;
extern int feof_unlocked (FILE *__stream) ;
extern int ferror_unlocked (FILE *__stream) ;
extern void perror (__const char *__s) ;
extern int sys_nerr;
extern __const char *__const sys_errlist[];
extern int fileno (FILE *__stream) ;
extern int fileno_unlocked (FILE *__stream) ;
extern FILE *popen (__const char *__command, __const char *__modes) ;
extern int pclose (FILE *__stream) ;
extern char *ctermid (char *__s) ;
# 603 "/usr/include/stdio.h" 3
extern void flockfile (FILE *__stream) ;
extern int ftrylockfile (FILE *__stream) ;
extern void funlockfile (FILE *__stream) ;
# 1 "out.c" 2
int main(void)
{
struct { char x; undefined type y; } v;
d=((unsigned char *) &v.y)-((unsigned char *) &v.x);
}
the hadrware is linux 2.2.9 on a P II/350. A kernel patch not 100%
compatible with the kernel source prevents me obtaining a core dump.