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* gcc HEAD bad stabs (?)
@ 2003-09-12  8:11 Michael Elizabeth Chastain
  2003-09-12 14:33 ` Daniel Jacobowitz
  2003-09-12 21:05 ` Christopher Faylor
  0 siblings, 2 replies; 9+ messages in thread
From: Michael Elizabeth Chastain @ 2003-09-12  8:11 UTC (permalink / raw)
  To: gdb

I think gcc HEAD is emitting bad stabs again,
and need some confirmation before I can file a bug report.

The questionable stabs happen when 'main' calls 'factorial',
but there is no prototype for 'factorial' yet.  Here are all
the stabs after the boilerplate stabs.  The full source code
and assembly code are at the end of the message.

	# some stabs for factorial
	.stabs	"factorial:F(0,3)",36,0,13,factorial
	.stabs	"value:p(0,3)",160,0,12,8
	.stabs	"value:r(0,3)",64,0,12,3
	.stabs	"",36,0,0,.Lscope0-factorial
	# some stabs for main
	.stabs	"main:F(0,3)",36,0,6,main
	.stabs	"argc:p(0,3)",160,0,5,8
	.stabs	"argv:p(0,21)=*(3,36)",160,0,5,12
	.stabs	"envp:p(0,21)",160,0,5,16
	.stabs	"/usr/include/stdlib.h",132,0,0,.Ltext1
	.stabs	"z0.c",132,0,0,.Ltext2
	# stray stab for factorial!!
	.stabs	"factorial:F(0,3)",36,0,13,factorial
	# end of main
	.stabs	"",36,0,0,.Lscope1-main
	.stabs "",100,0,0,.Letext

Look at that stray stab for factorial, which occurs just
before the stab for .Lscope1-main!

This causes a subtle problem in gdb.  gdb gets a bogus endaddr
for the block with main in it, so find_function_start_sal fails
to adjust for the prologue properly, so the breakpoint at the
beginning of an instruction happens too early.  The bad block
probably causes more problems, too.

I searched gcc and isolated the problem to this patch:

  Fri Sep  5 07:35:16 CEST 2003  Jan Hubicka  <jh@suse.cz>

        * opts.c (decode_options): Enable unit-at-a-time at -O2.
	* params.def (max-inline-insns-single): Set to 500
	  (max-inline-insns-auto): Set to 150
	* invoke.texi (max-inline-insns-single, max-inline-insns-auto): Update.

It looks like we're getting the first whiff of unit-at-a-time problems.
Most of the gdb test suite runs at -O0 so it won't cover this yet.

Am I right in believing that this is a gcc bug in stabs emitter?
If so, I will file a PR against gcc.

Michael C

=== z0.c

#include <stdio.h>
#include <stdlib.h>

int
main (int argc, char *argv [], char **envp)
{
    printf ("%d\n", factorial (atoi ("6")));
    return 0;
}

int
factorial (int value)
{
    if (value > 1) {
	value *= factorial (value - 1);
    }
    return (value);
}

=== z0.s
=== compiled with: gcc -O2 -gstabs+ -S

	.file	"z0.c"
	.stabs	"/berman/home/mgnu/gcc/breako2/",100,0,0,.Ltext0
	.stabs	"z0.c",100,0,0,.Ltext0
	.text
.Ltext0:
	.stabs	"gcc2_compiled.",60,0,0,0
	.stabs	"_Bool:t(0,1)=@s8;-16;",128,0,0,0
	.stabs	"unsigned int:t(0,2)=r(0,2);0000000000000;0037777777777;",128,0,0,0
	.stabs	"int:t(0,3)=r(0,3);-2147483648;2147483647;",128,0,0,0
	.stabs	"__builtin_va_list:t(0,4)=*(0,5)=r(0,5);0;127;",128,0,0,0
	.stabs	"long long unsigned int:t(0,6)=@s64;r(0,6);0000000000000;01777777777777777777777;",128,0,0,0
	.stabs	"long long int:t(0,7)=@s64;r(0,7);01000000000000000000000;0777777777777777777777;",128,0,0,0
	.stabs	"long unsigned int:t(0,8)=r(0,8);0000000000000;0037777777777;",128,0,0,0
	.stabs	"long int:t(0,9)=r(0,9);-2147483648;2147483647;",128,0,0,0
	.stabs	"complex long double:t(0,10)=R5;24;0;",128,0,0,0
	.stabs	"complex double:t(0,11)=R4;16;0;",128,0,0,0
	.stabs	"complex float:t(0,12)=R3;8;0;",128,0,0,0
	.stabs	"complex int:t(0,13)=s8real:(0,3),0,32;imag:(0,3),32,32;;",128,0,0,0
	.stabs	"long double:t(0,14)=r(0,3);12;0;",128,0,0,0
	.stabs	"double:t(0,15)=r(0,3);8;0;",128,0,0,0
	.stabs	"float:t(0,16)=r(0,3);4;0;",128,0,0,0
	.stabs	"unsigned char:t(0,17)=@s8;r(0,17);0;255;",128,0,0,0
	.stabs	"signed char:t(0,18)=@s8;r(0,18);-128;127;",128,0,0,0
	.stabs	"short unsigned int:t(0,19)=@s16;r(0,19);0;65535;",128,0,0,0
	.stabs	"short int:t(0,20)=@s16;r(0,20);-32768;32767;",128,0,0,0
	.stabs	"char:t(0,5)",128,0,0,0
	.stabs	"/usr/include/stdio.h",130,0,0,0
	.stabs	"/berman/fsf/shelf/2003-09-05-06-00-00/berman/install/target/native/gcc/gcc-HEAD-binutils-2.14/lib/gcc/i686-pc-linux-gnu/3.4/include/stddef.h",130,0,0,0
	.stabs	"size_t:t(2,1)=(0,2)",128,0,213,0
	.stabn	162,0,0,0
	.stabs	"/usr/include/bits/types.h",130,0,0,0
	.stabs	"__u_char:t(3,1)=(0,17)",128,0,32,0
	.stabs	"__u_short:t(3,2)=(0,19)",128,0,33,0
	.stabs	"__u_int:t(3,3)=(0,2)",128,0,34,0
	.stabs	"__u_long:t(3,4)=(0,8)",128,0,35,0
	.stabs	"__u_quad_t:t(3,5)=(0,6)",128,0,37,0
	.stabs	"__quad_t:t(3,6)=(0,7)",128,0,38,0
	.stabs	"__int8_t:t(3,7)=(0,18)",128,0,49,0
	.stabs	"__uint8_t:t(3,8)=(0,17)",128,0,50,0
	.stabs	"__int16_t:t(3,9)=(0,20)",128,0,51,0
	.stabs	"__uint16_t:t(3,10)=(0,19)",128,0,52,0
	.stabs	"__int32_t:t(3,11)=(0,3)",128,0,53,0
	.stabs	"__uint32_t:t(3,12)=(0,2)",128,0,54,0
	.stabs	"__int64_t:t(3,13)=(0,7)",128,0,56,0
	.stabs	"__uint64_t:t(3,14)=(0,6)",128,0,57,0
	.stabs	"__qaddr_t:t(3,15)=(3,16)=*(3,6)",128,0,59,0
	.stabs	"__dev_t:t(3,17)=(3,5)",128,0,61,0
	.stabs	"__uid_t:t(3,18)=(3,3)",128,0,62,0
	.stabs	"__gid_t:t(3,19)=(3,3)",128,0,63,0
	.stabs	"__ino_t:t(3,20)=(3,4)",128,0,64,0
	.stabs	"__mode_t:t(3,21)=(3,3)",128,0,65,0
	.stabs	"__nlink_t:t(3,22)=(3,3)",128,0,66,0
	.stabs	"__off_t:t(3,23)=(0,9)",128,0,67,0
	.stabs	"__loff_t:t(3,24)=(3,6)",128,0,68,0
	.stabs	"__pid_t:t(3,25)=(0,3)",128,0,69,0
	.stabs	"__ssize_t:t(3,26)=(0,3)",128,0,70,0
	.stabs	"__rlim_t:t(3,27)=(3,4)",128,0,71,0
	.stabs	"__rlim64_t:t(3,28)=(3,5)",128,0,72,0
	.stabs	"__id_t:t(3,29)=(3,3)",128,0,73,0
	.stabs	"__fsid_t:t(3,30)=(3,31)=s8__val:(3,32)=ar(3,33)=r(3,33);0000000000000;0037777777777;;0;1;(0,3),0,64;;",128,0,78,0
	.stabs	"__daddr_t:t(3,34)=(0,3)",128,0,81,0
	.stabs	"__caddr_t:t(3,35)=(3,36)=*(0,5)",128,0,82,0
	.stabs	"__time_t:t(3,37)=(0,9)",128,0,83,0
	.stabs	"__useconds_t:t(3,38)=(0,2)",128,0,84,0
	.stabs	"__suseconds_t:t(3,39)=(0,9)",128,0,85,0
	.stabs	"__swblk_t:t(3,40)=(0,9)",128,0,86,0
	.stabs	"__clock_t:t(3,41)=(0,9)",128,0,88,0
	.stabs	"__clockid_t:t(3,42)=(0,3)",128,0,91,0
	.stabs	"__timer_t:t(3,43)=(0,3)",128,0,94,0
	.stabs	"__key_t:t(3,44)=(0,3)",128,0,101,0
	.stabs	"__ipc_pid_t:t(3,45)=(0,19)",128,0,104,0
	.stabs	"__blksize_t:t(3,46)=(0,9)",128,0,108,0
	.stabs	"__blkcnt_t:t(3,47)=(0,9)",128,0,113,0
	.stabs	"__blkcnt64_t:t(3,48)=(3,6)",128,0,114,0
	.stabs	"__fsblkcnt_t:t(3,49)=(3,4)",128,0,117,0
	.stabs	"__fsblkcnt64_t:t(3,50)=(3,5)",128,0,118,0
	.stabs	"__fsfilcnt_t:t(3,51)=(3,4)",128,0,121,0
	.stabs	"__fsfilcnt64_t:t(3,52)=(3,5)",128,0,122,0
	.stabs	"__ino64_t:t(3,53)=(3,5)",128,0,125,0
	.stabs	"__off64_t:t(3,54)=(3,24)",128,0,128,0
	.stabs	"__t_scalar_t:t(3,55)=(0,9)",128,0,131,0
	.stabs	"__t_uscalar_t:t(3,56)=(0,8)",128,0,132,0
	.stabs	"__intptr_t:t(3,57)=(0,3)",128,0,135,0
	.stabs	"__socklen_t:t(3,58)=(0,2)",128,0,138,0
	.stabs	"/usr/include/bits/pthreadtypes.h",130,0,0,0
	.stabs	"/usr/include/bits/sched.h",130,0,0,0
	.stabs	"__sched_param:T(5,1)=s4__sched_priority:(0,3),0,32;;",128,0,0,0
	.stabn	162,0,0,0
	.stabs	"_pthread_fastlock:T(4,1)=s8__status:(0,9),0,32;__spinlock:(0,3),32,32;;",128,0,0,0
	.stabs	"_pthread_descr:t(4,2)=(4,3)=*(4,4)=xs_pthread_descr_struct:",128,0,35,0
	.stabs	"__pthread_attr_s:T(4,5)=s36__detachstate:(0,3),0,32;__schedpolicy:(0,3),32,32;__schedparam:(5,1),64,32;__inheritsched:(0,3),96,32;__scope:(0,3),128,32;__guardsize:(2,1),160,32;__stackaddr_set:(0,3),192,32;__stackaddr:(4,6)=*(4,7)=(4,7),224,32;__stacksize:(2,1),256,32;;",128,0,0,0
	.stabs	"pthread_attr_t:t(4,8)=(4,5)",128,0,52,0
	.stabs	"pthread_cond_t:t(4,9)=(4,10)=s12__c_lock:(4,1),0,64;__c_waiting:(4,2),64,32;;",128,0,60,0
	.stabs	"pthread_condattr_t:t(4,11)=(4,12)=s4__dummy:(0,3),0,32;;",128,0,67,0
	.stabs	"pthread_key_t:t(4,13)=(0,2)",128,0,70,0
	.stabs	"pthread_mutex_t:t(4,14)=(4,15)=s24__m_reserved:(0,3),0,32;__m_count:(0,3),32,32;__m_owner:(4,2),64,32;__m_kind:(0,3),96,32;__m_lock:(4,1),128,64;;",128,0,83,0
	.stabs	"pthread_mutexattr_t:t(4,16)=(4,17)=s4__mutexkind:(0,3),0,32;;",128,0,90,0
	.stabs	"pthread_once_t:t(4,18)=(0,3)",128,0,94,0
	.stabs	"pthread_t:t(4,19)=(0,8)",128,0,140,0
	.stabn	162,0,0,0
	.stabn	162,0,0,0
	.stabs	"FILE:t(1,1)=(1,2)=xs_IO_FILE:",128,0,46,0
	.stabs	"__FILE:t(1,3)=(1,2)",128,0,62,0
	.stabs	"/usr/include/libio.h",130,0,0,0
	.stabs	"/usr/include/_G_config.h",130,0,0,0
	.stabs	"/berman/fsf/shelf/2003-09-05-06-00-00/berman/install/target/native/gcc/gcc-HEAD-binutils-2.14/lib/gcc/i686-pc-linux-gnu/3.4/include/stddef.h",130,0,0,0
	.stabs	"wchar_t:t(8,1)=(0,9)",128,0,325,0
	.stabs	"wint_t:t(8,2)=(0,2)",128,0,354,0
	.stabn	162,0,0,0
	.stabs	"/usr/include/wchar.h",130,0,0,0
	.stabs	"__mbstate_t:t(9,1)=(9,2)=s8__count:(0,3),0,32;__value:(9,3)=u4__wch:(8,2),0,32;__wchb:(9,4)=ar(3,33);0;3;(0,5),0,32;;,32,32;;",128,0,79,0
	.stabn	162,0,0,0
	.stabs	"_G_fpos_t:t(7,1)=(7,2)=s12__pos:(3,23),0,32;__state:(9,1),32,64;;",128,0,30,0
	.stabs	"_G_fpos64_t:t(7,3)=(7,4)=s16__pos:(3,54),0,64;__state:(9,1),64,64;;",128,0,35,0
	.stabs	"/usr/include/gconv.h",130,0,0,0
	.stabs	" :T(10,1)=e__GCONV_OK:0,__GCONV_NOCONV:1,__GCONV_NODB:2,__GCONV_NOMEM:3,__GCONV_EMPTY_INPUT:4,__GCONV_FULL_OUTPUT:5,__GCONV_ILLEGAL_INPUT:6,__GCONV_INCOMPLETE_INPUT:7,__GCONV_ILLEGAL_DESCRIPTOR:8,__GCONV_INTERNAL_ERROR:9,;",128,0,0,0
	.stabs	" :T(10,2)=e__GCONV_IS_LAST:1,__GCONV_IGNORE_ERRORS:2,;",128,0,0,0
	.stabs	"__gconv_fct:t(10,3)=(10,4)=*(10,5)=f(0,3)",128,0,72,0
	.stabs	"__gconv_init_fct:t(10,6)=(10,7)=*(10,8)=f(0,3)",128,0,75,0
	.stabs	"__gconv_end_fct:t(10,9)=(10,10)=*(10,11)=f(4,7)",128,0,76,0
	.stabs	"__gconv_trans_fct:t(10,12)=(10,13)=*(10,14)=f(0,3)",128,0,85,0
	.stabs	"__gconv_trans_context_fct:t(10,15)=(10,16)=*(10,17)=f(0,3)",128,0,90,0
	.stabs	"__gconv_trans_query_fct:t(10,18)=(10,19)=*(10,20)=f(0,3)",128,0,94,0
	.stabs	"__gconv_trans_init_fct:t(10,21)=(10,22)=*(10,23)=f(0,3)",128,0,97,0
	.stabs	"__gconv_trans_end_fct:t(10,24)=(10,25)=*(10,26)=f(4,7)",128,0,98,0
	.stabs	"__gconv_trans_data:T(10,27)=s20__trans_fct:(10,12),0,32;__trans_context_fct:(10,15),32,32;__trans_end_fct:(10,24),64,32;__data:(4,6),96,32;__next:(10,28)=*(10,27),128,32;;",128,0,0,0
	.stabs	"__gconv_step:T(10,29)=s56__shlib_handle:(10,30)=*(10,31)=xs__gconv_loaded_object:,0,32;__modname:(10,32)=*(10,33)=k(0,5),32,32;__counter:(0,3),64,32;__from_name:(3,36),96,32;__to_name:(3,36),128,32;__fct:(10,3),160,32;__init_fct:(10,6),192,32;__end_fct:(10,9),224,32;__min_needed_from:(0,3),256,32;__max_needed_from:(0,3),288,32;__min_needed_to:(0,3),320,32;__max_needed_to:(0,3),352,32;__stateful:(0,3),384,32;__data:(4,6),416,32;;",128,0,0,0
	.stabs	"__gconv_step_data:T(10,34)=s36__outbuf:(10,35)=*(0,17),0,32;__outbufend:(10,35),32,32;__flags:(0,3),64,32;__invocation_counter:(0,3),96,32;__internal_use:(0,3),128,32;__statep:(10,36)=*(9,1),160,32;__state:(9,1),192,64;__trans:(10,28),256,32;;",128,0,0,0
	.stabs	"__gconv_info:T(10,37)=s8__nsteps:(2,1),0,32;__steps:(10,38)=*(10,29),32,32;;",128,0,0,0
	.stabs	"__gconv_t:t(10,39)=(10,40)=*(10,37)",128,0,173,0
	.stabn	162,0,0,0
	.stabs	"_G_iconv_t:t(7,5)=(7,6)=u44__cd:(10,37),0,64;__combined:(7,7)=s44__cd:(10,37),0,64;__data:(10,34),64,288;;,0,352;;",128,0,53,0
	.stabs	"_G_int16_t:t(7,8)=(0,20)",128,0,55,0
	.stabs	"_G_int32_t:t(7,9)=(0,3)",128,0,56,0
	.stabs	"_G_uint16_t:t(7,10)=(0,19)",128,0,57,0
	.stabs	"_G_uint32_t:t(7,11)=(0,2)",128,0,58,0
	.stabn	162,0,0,0
	.stabs	"/berman/fsf/shelf/2003-09-05-06-00-00/berman/install/target/native/gcc/gcc-HEAD-binutils-2.14/lib/gcc/i686-pc-linux-gnu/3.4/include/stdarg.h",130,0,0,0
	.stabs	"__gnuc_va_list:t(11,1)=(0,4)",128,0,43,0
	.stabn	162,0,0,0
	.stabs	"_IO_lock_t:t(6,1)=(4,7)",128,0,172,0
	.stabs	"_IO_marker:T(6,2)=s12_next:(6,3)=*(6,2),0,32;_sbuf:(6,4)=*(1,2),32,32;_pos:(0,3),64,32;;",128,0,0,0
	.stabs	"__codecvt_result:T(6,5)=e__codecvt_ok:0,__codecvt_partial:1,__codecvt_error:2,__codecvt_noconv:3,;",128,0,0,0
	.stabs	"_IO_FILE:T(1,2)=s148_flags:(0,3),0,32;_IO_read_ptr:(3,36),32,32;_IO_read_end:(3,36),64,32;_IO_read_base:(3,36),96,32;_IO_write_base:(3,36),128,32;_IO_write_ptr:(3,36),160,32;_IO_write_end:(3,36),192,32;_IO_buf_base:(3,36),224,32;_IO_buf_end:(3,36),256,32;_IO_save_base:(3,36),288,32;_IO_backup_base:(3,36),320,32;_IO_save_end:(3,36),352,32;_markers:(6,3),384,32;_chain:(6,4),416,32;_fileno:(0,3),448,32;_flags2:(0,3),480,32;_old_offset:(3,23),512,32;_cur_column:(0,19),544,16;_vtable_offset:(0,18),560,8;_shortbuf:(6,6)=ar(3,33);0;0;(0,5),568,8;_lock:(6,7)=*(6,1),576,32;_offset:(3,54),608,64;__pad1:(4,6),672,32;__pad2:(4,6),704,32;_mode:(0,3),736,32;_unused2:(6,8)=ar(3,33);0;51;(0,5),768,416;;",128,0,0,0
	.stabs	"_IO_FILE:t(6,9)=(1,2)",128,0,327,0
	.stabs	"__io_read_fn:t(6,10)=(6,11)=f(3,26)",128,0,350,0
	.stabs	"__io_write_fn:t(6,12)=(6,13)=f(3,26)",128,0,359,0
	.stabs	"__io_seek_fn:t(6,14)=(6,15)=f(0,3)",128,0,367,0
	.stabs	"__io_close_fn:t(6,16)=(6,17)=f(0,3)",128,0,370,0
	.stabn	162,0,0,0
	.stabs	"fpos_t:t(1,4)=(7,1)",128,0,88,0
	.stabn	162,0,0,0
	.stabs	"/usr/include/stdlib.h",130,0,0,0
	.stabs	"div_t:t(12,1)=(12,2)=s8quot:(0,3),0,32;rem:(0,3),32,32;;",128,0,99,0
	.stabs	"ldiv_t:t(12,3)=(12,4)=s8quot:(0,9),0,32;rem:(0,9),32,32;;",128,0,107,0
	.stabs	"/usr/include/sys/types.h",130,0,0,0
	.stabs	"u_char:t(13,1)=(3,1)",128,0,34,0
	.stabs	"u_short:t(13,2)=(3,2)",128,0,35,0
	.stabs	"u_int:t(13,3)=(3,3)",128,0,36,0
	.stabs	"u_long:t(13,4)=(3,4)",128,0,37,0
	.stabs	"quad_t:t(13,5)=(3,6)",128,0,38,0
	.stabs	"u_quad_t:t(13,6)=(3,5)",128,0,39,0
	.stabs	"fsid_t:t(13,7)=(3,30)",128,0,40,0
	.stabs	"loff_t:t(13,8)=(3,24)",128,0,45,0
	.stabs	"ino_t:t(13,9)=(3,20)",128,0,49,0
	.stabs	"dev_t:t(13,10)=(3,17)",128,0,61,0
	.stabs	"gid_t:t(13,11)=(3,19)",128,0,66,0
	.stabs	"mode_t:t(13,12)=(3,21)",128,0,71,0
	.stabs	"nlink_t:t(13,13)=(3,22)",128,0,76,0
	.stabs	"uid_t:t(13,14)=(3,18)",128,0,81,0
	.stabs	"off_t:t(13,15)=(3,23)",128,0,87,0
	.stabs	"pid_t:t(13,16)=(3,25)",128,0,99,0
	.stabs	"id_t:t(13,17)=(3,29)",128,0,104,0
	.stabs	"ssize_t:t(13,18)=(3,26)",128,0,109,0
	.stabs	"daddr_t:t(13,19)=(3,34)",128,0,115,0
	.stabs	"caddr_t:t(13,20)=(3,35)",128,0,116,0
	.stabs	"key_t:t(13,21)=(3,44)",128,0,122,0
	.stabs	"/usr/include/time.h",130,0,0,0
	.stabs	"time_t:t(14,1)=(3,37)",128,0,76,0
	.stabs	"clockid_t:t(14,2)=(3,42)",128,0,92,0
	.stabs	"timer_t:t(14,3)=(3,43)",128,0,104,0
	.stabn	162,0,0,0
	.stabs	"ulong:t(13,22)=(0,8)",128,0,150,0
	.stabs	"ushort:t(13,23)=(0,19)",128,0,151,0
	.stabs	"uint:t(13,24)=(0,2)",128,0,152,0
	.stabs	"int8_t:t(13,25)=(0,18)",128,0,190,0
	.stabs	"int16_t:t(13,26)=(0,20)",128,0,191,0
	.stabs	"int32_t:t(13,27)=(0,3)",128,0,192,0
	.stabs	"int64_t:t(13,28)=(0,7)",128,0,193,0
	.stabs	"u_int8_t:t(13,29)=(0,17)",128,0,196,0
	.stabs	"u_int16_t:t(13,30)=(0,19)",128,0,197,0
	.stabs	"u_int32_t:t(13,31)=(0,2)",128,0,198,0
	.stabs	"u_int64_t:t(13,32)=(0,6)",128,0,199,0
	.stabs	"register_t:t(13,33)=(0,3)",128,0,201,0
	.stabs	"/usr/include/sys/select.h",130,0,0,0
	.stabs	"/usr/include/bits/sigset.h",130,0,0,0
	.stabs	"__sig_atomic_t:t(16,1)=(0,3)",128,0,23,0
	.stabs	"__sigset_t:t(16,2)=(16,3)=s128__val:(16,4)=ar(3,33);0;31;(0,8),0,1024;;",128,0,31,0
	.stabn	162,0,0,0
	.stabs	"sigset_t:t(15,1)=(16,2)",128,0,38,0
	.stabs	"/usr/include/time.h",130,0,0,0
	.stabs	"timespec:T(17,1)=s8tv_sec:(3,37),0,32;tv_nsec:(0,9),32,32;;",128,0,0,0
	.stabn	162,0,0,0
	.stabs	"/usr/include/bits/time.h",130,0,0,0
	.stabs	"timeval:T(18,1)=s8tv_sec:(3,37),0,32;tv_usec:(3,39),32,32;;",128,0,0,0
	.stabn	162,0,0,0
	.stabs	"suseconds_t:t(15,2)=(3,39)",128,0,49,0
	.stabs	"__fd_mask:t(15,3)=(0,9)",128,0,55,0
	.stabs	"fd_set:t(15,4)=(15,5)=s128__fds_bits:(15,6)=ar(3,33);0;31;(15,3),0,1024;;",128,0,78,0
	.stabs	"fd_mask:t(15,7)=(15,3)",128,0,85,0
	.stabn	162,0,0,0
	.stabs	"blkcnt_t:t(13,34)=(3,47)",128,0,230,0
	.stabs	"fsblkcnt_t:t(13,35)=(3,49)",128,0,234,0
	.stabs	"fsfilcnt_t:t(13,36)=(3,51)",128,0,238,0
	.stabn	162,0,0,0
	.stabs	"random_data:T(12,5)=s28fptr:(12,6)=*(13,27),0,32;rptr:(12,6),32,32;state:(12,6),64,32;rand_type:(0,3),96,32;rand_deg:(0,3),128,32;rand_sep:(0,3),160,32;end_ptr:(12,6),192,32;;",128,0,0,0
	.stabs	"drand48_data:T(12,7)=s24__x:(12,8)=ar(3,33);0;2;(0,19),0,48;__old_x:(12,8),48,48;__c:(0,19),96,16;__init:(0,19),112,16;__a:(0,6),128,64;;",128,0,0,0
	.stabs	"__compar_fn_t:t(12,9)=(12,10)=*(12,11)=f(0,3)",128,0,720,0
	.stabn	162,0,0,0
	.p2align 4,,15
	.stabs	"factorial:F(0,3)",36,0,13,factorial
	.stabs	"value:p(0,3)",160,0,12,8
.globl factorial
	.type	factorial, @function
factorial:
	.stabn 68,0,13,.LM1-factorial
.LM1:
	pushl	%ebp
	movl	%esp, %ebp
	pushl	%ebx
	subl	$4, %esp
	movl	8(%ebp), %ebx
	.stabn 68,0,14,.LM2-factorial
.LM2:
	cmpl	$1, %ebx
	jg	.L5
	.stabn 68,0,18,.LM3-factorial
.LM3:
	popl	%edx
	movl	%ebx, %eax
	popl	%ebx
	popl	%ebp
	ret
	.p2align 4,,7
.L5:
	.stabn 68,0,15,.LM4-factorial
.LM4:
	leal	-1(%ebx), %eax
	movl	%eax, (%esp)
	call	factorial
	.stabn 68,0,18,.LM5-factorial
.LM5:
	popl	%edx
	.stabn 68,0,15,.LM6-factorial
.LM6:
	imull	%eax, %ebx
	.stabn 68,0,18,.LM7-factorial
.LM7:
	movl	%ebx, %eax
	popl	%ebx
	popl	%ebp
	ret
	.size	factorial, .-factorial
	.stabs	"value:r(0,3)",64,0,12,3
.Lscope0:
	.stabs	"",36,0,0,.Lscope0-factorial
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"6"
.LC1:
	.string	"%d\n"
	.text
	.p2align 4,,15
	.stabs	"main:F(0,3)",36,0,6,main
	.stabs	"argc:p(0,3)",160,0,5,8
	.stabs	"argv:p(0,21)=*(3,36)",160,0,5,12
	.stabs	"envp:p(0,21)",160,0,5,16
.globl main
	.type	main, @function
main:
	.stabn 68,0,6,.LM8-main
.LM8:
.LBB2:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$24, %esp
	andl	$-16, %esp
.LBB3:
.LBB4:
.LBB5:
	.stabs	"/usr/include/stdlib.h",132,0,0,.Ltext1
.Ltext1:
	.stabn 68,0,317,.LM9-main
.LM9:
	movl	$0, 12(%esp)
	movl	$10, 8(%esp)
	movl	$0, 4(%esp)
	movl	$.LC0, (%esp)
	call	__strtol_internal
.LBE5:
.LBE4:
.LBE3:
.LBE2:
	.stabn 68,0,382,.LM10-main
.LM10:
	movl	%eax, (%esp)
	call	factorial
	movl	%eax, 4(%esp)
	movl	$.LC1, (%esp)
	call	printf
	.stabs	"z0.c",132,0,0,.Ltext2
.Ltext2:
	.stabn 68,0,9,.LM11-main
.LM11:
	leave
	xorl	%eax, %eax
	ret
	.size	main, .-main
	.stabs	"factorial:F(0,3)",36,0,13,factorial
.Lscope1:
	.stabs	"",36,0,0,.Lscope1-main
	.text
	.stabs "",100,0,0,.Letext
.Letext:
	.section	.note.GNU-stack,"",@progbits
	.ident	"GCC: (GNU) 3.4 20030905 (experimental)"


^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: gcc HEAD bad stabs (?)
@ 2003-09-12 18:33 Michael Elizabeth Chastain
  0 siblings, 0 replies; 9+ messages in thread
From: Michael Elizabeth Chastain @ 2003-09-12 18:33 UTC (permalink / raw)
  To: drow, gdb

drow> I agree that this is a bug.  Factorial is not inside of main,
drow> so stabs with its address shouldn't be either.

Thanks.  Bugzilla, here I come.

Michael C


^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: gcc HEAD bad stabs (?)
@ 2003-09-12 22:24 Michael Elizabeth Chastain
  2003-09-13  0:01 ` Christopher Faylor
  0 siblings, 1 reply; 9+ messages in thread
From: Michael Elizabeth Chastain @ 2003-09-12 22:24 UTC (permalink / raw)
  To: cgf, gdb

cgf> "again"?  When did it stop?

Okay, "again" is not quite what I meant to say.  I really meant: 
"once again, gcc HEAD has a new bug".  I'm starting to expect 1-2
of these per week.

cgf> Things seem to be getting worse and worse.

They are.  I'm opening bugs against gcc HEAD faster than the gcc
people are closing them.  And I still have several regressions
left over from the April-June period when I wasn't around.

As far as I can see, the only feedback loop for gcc debug info
changes is me running the test suite.  Ideas for improving this
welcomed.

Maybe I should set up a separate test bed and spin it
1-2 times per day with gcc HEAD, binutils 2.14, gdb 5.3.91.

Michael C


^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: gcc HEAD bad stabs (?)
@ 2003-09-13  0:17 Michael Elizabeth Chastain
  2003-09-13  0:36 ` Christopher Faylor
  0 siblings, 1 reply; 9+ messages in thread
From: Michael Elizabeth Chastain @ 2003-09-13  0:17 UTC (permalink / raw)
  To: cgf; +Cc: gdb

cgf> Hmm.  Have you considered sending email with a subject like "The
cgf> continual degradation of stabs with gcc" or something like that?
cgf> I'd do it but then someone would ask for details...

Well, gcc has a process in place: I file P1 bugs, I mark them
as "[3.4 regression]", Mark Mitchell in his capacity as release manager
tracks all the regression bugs.  We can't really make other people
fix bugs.  Look to our own house; the number of open gdb bugs goes up
and up and up.

When the season comes to cut the 3.4 branch I will complain if there
are ANY open debug info regressions at that time.  But they are
months away from cutting their branch.

I think we just have to suck it up and accept that gcc HEAD is
dangerously unstable, and keep filing regression bugs.  It's dangerous
for anybody to ship a compiler out of gcc HEAD!  The gcc 3.3 branch is
healthy and I haven't had trouble with it in the test bed.

Another thing gdb can do is fix some of our tests that fluctuate from
run to run, so that it's easier to tell people "run the gdb test suite
before and after and compare the results".  And contribute to Dan
Kegel's crossgcc project so that it does crossgdb as well.

Michael C


^ permalink raw reply	[flat|nested] 9+ messages in thread
* Re: gcc HEAD bad stabs (?)
@ 2003-09-13  0:40 Michael Elizabeth Chastain
  0 siblings, 0 replies; 9+ messages in thread
From: Michael Elizabeth Chastain @ 2003-09-13  0:40 UTC (permalink / raw)
  To: cgf; +Cc: gdb

cgf> You seem to be discounting the impact of email which summarizes a trend.
cgf> Everyone knows that gcc is getting slower and slower, too.  There may
cgf> even be bugs filed against that fact.  But often when someone posts hard
cgf> facts showing the trend, there is a flurry of interest and activity.  I'm
cgf> sure that the gdb community would respond similarly.

You are right; I didn't think of it that way.

I'm still at the annoying stage where I see a problem but I don't
like any suggestions for fixing it, even when I ask for them.
Mmmm, sorry about that.

At least we're all aware there is a problem now; and some specific PR's
are getting fixed in gcc land.

Michael C


^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2003-09-13  0:40 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2003-09-12  8:11 gcc HEAD bad stabs (?) Michael Elizabeth Chastain
2003-09-12 14:33 ` Daniel Jacobowitz
2003-09-12 21:05 ` Christopher Faylor
2003-09-12 18:33 Michael Elizabeth Chastain
2003-09-12 22:24 Michael Elizabeth Chastain
2003-09-13  0:01 ` Christopher Faylor
2003-09-13  0:17 Michael Elizabeth Chastain
2003-09-13  0:36 ` Christopher Faylor
2003-09-13  0:40 Michael Elizabeth Chastain

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