[RFA record/replay] Eliminate global variables

[Michael Snyder]

Done, and thanks for the quick response!

teawater wrote:
> If you have checked in the code that disable the displaced_stepping
> when precord is enable, this patch is OK. Please check it in.
> 
> Thanks,
> Hui
> 
> On Tue, Oct 7, 2008 at 09:04, Michael Snyder <msnyder@vmware.com> wrote:
>> The change to 'use_displaced_stepping' makes these
>> changes unnecessary.  GDB will not use displaced stepping
>> while recording or replaying.
>>
>>
>> 2008-10-06  Michael Snyder  <msnyder@vmware.com>
>>
>>        * record.c (displaced_step_fixup): Remove.
>>        (record_message_cleanups): Remove displaced step handling.
>>        (record_message): Remove displaced step handling.
>>        * infrun.c (displaced_step_ptid): Back to being static.
>>        (displaced_step_original, displaced_step_copy): Ditto.
>>
>> Index: infrun.c
>> ===================================================================
>> RCS file: /cvs/src/src/gdb/infrun.c,v
>> retrieving revision 1.300.2.9
>> diff -u -p -r1.300.2.9 infrun.c
>> --- infrun.c    6 Oct 2008 17:23:31 -0000       1.300.2.9
>> +++ infrun.c    6 Oct 2008 22:56:32 -0000
>> @@ -594,9 +594,7 @@ static ptid_t deferred_step_ptid;
>>  /* If this is not null_ptid, this is the thread carrying out a
>>    displaced single-step.  This thread's state will require fixing up
>>    once it has completed its step.  */
>> -/* Record.c(record_message) use it to confirm if the next step is displaced
>> -   step. */
>> -ptid_t displaced_step_ptid;
>> +static ptid_t displaced_step_ptid;
>>
>>  struct displaced_step_request
>>  {
>> @@ -615,9 +613,7 @@ static struct gdbarch *displaced_step_gd
>>  static struct displaced_step_closure *displaced_step_closure;
>>
>>  /* The address of the original instruction, and the copy we made.  */
>> -/* Record.c(record_message) use them to get the original PC and set it
>> back.
>> -   Because record_message need to record the original PC. */
>> -CORE_ADDR displaced_step_original, displaced_step_copy;
>> +static CORE_ADDR displaced_step_original, displaced_step_copy;
>>
>>  /* Saved contents of copy area.  */
>>  static gdb_byte *displaced_step_saved_copy;
>> Index: record.c
>> ===================================================================
>> RCS file: /cvs/src/src/gdb/Attic/record.c,v
>> retrieving revision 1.1.2.17
>> diff -u -p -r1.1.2.17 record.c
>> --- record.c    6 Oct 2008 17:52:17 -0000       1.1.2.17
>> +++ record.c    6 Oct 2008 22:56:32 -0000
>> @@ -37,9 +37,6 @@ record_t *record_arch_list_head = NULL;
>>  record_t *record_arch_list_tail = NULL;
>>  struct regcache *record_regcache = NULL;
>>
>> -extern void displaced_step_fixup (ptid_t event_ptid,
>> -                                 enum target_signal signal);
>> -
>>  /* 0 ask user. 1 auto delete the last record_t.  */
>>  static int record_insn_max_mode = 0;
>>  static int record_insn_max_num = DEFAULT_RECORD_INSN_MAX_NUM;
>> @@ -54,8 +51,6 @@ static int record_not_record = 0;
>>  int record_will_store_registers = 0;
>>
>>  extern struct bp_location *bp_location_chain;
>> -extern ptid_t displaced_step_ptid;
>> -extern CORE_ADDR displaced_step_original, displaced_step_copy;
>>
>>  /* The real beneath function pointers.  */
>>  void (*record_beneath_to_resume) (ptid_t, int, enum target_signal);
>> @@ -326,11 +321,6 @@ static void
>>  record_message_cleanups (void *ignore)
>>  {
>>   record_list_release (record_arch_list_tail);
>> -
>> -  /* Clean for displaced stepping */
>> -  if (!ptid_equal (displaced_step_ptid, null_ptid))
>> -    displaced_step_fixup (displaced_step_ptid, TARGET_SIGNAL_TRAP);
>> -
>>   set_executing (inferior_ptid, 0);
>>   normal_stop ();
>>  }
>> @@ -349,24 +339,7 @@ record_message (struct gdbarch *gdbarch)
>>
>>   record_regcache = get_current_regcache ();
>>
>> -  if (!ptid_equal (displaced_step_ptid, null_ptid))
>> -    {
>> -      /* Deal with displaced stepping.  */
>> -      if (record_debug)
>> -       {
>> -         fprintf_unfiltered (gdb_stdlog,
>> -                             "Record: this stepping is displaced stepping.
>>  Change PC register to original address 0x%s before call gdbarch_record.
>>  After that, change it back to 0x%s.\n",
>> -                             paddr_nz (displaced_step_original),
>> -                             paddr_nz (displaced_step_copy));
>> -       }
>> -      regcache_write_pc (record_regcache, displaced_step_original);
>> -      ret = gdbarch_record (gdbarch, displaced_step_copy);
>> -      regcache_write_pc (record_regcache, displaced_step_copy);
>> -    }
>> -  else
>> -    {
>> -      ret = gdbarch_record (gdbarch, regcache_read_pc (record_regcache));
>> -    }
>> +  ret = gdbarch_record (gdbarch, regcache_read_pc (record_regcache));
>>
>>   if (ret > 0)
>>     error (_("Record: record pause the program."));
>>
>>