gdb/remote.c: Eliminate target_buf/target_buf_size hack

This finally eliminates an old hack left in place when tracepoint RSP
support was migrated from tracepoint.c to remote.c, back in
35b1e5cca081 ("Make tracepoint operations go through target vector.")
over 7 years ago.

Tested on x86_64 GNU/Linux.

gdb/ChangeLog:
2017-09-29  Pedro Alves  <palves@redhat.com>

	* remote.c (target_buf, target_buf_size): Delete.
	(remote_get_noisy_reply): Remove buf_p and sizeof_buf parameters.
	Use the connection's packet buffer instead.
	All callers adjusted.
	(_initialize_remote): Remove references to target_buf and
	target_buf_size.

2 files changed, 78 insertions, 65 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ab9250c..dd4fb69 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,12 @@
+2017-09-29  Pedro Alves  <palves@redhat.com>
+
+	* remote.c (target_buf, target_buf_size): Delete.
+	(remote_get_noisy_reply): Remove buf_p and sizeof_buf parameters.
+	Use the connection's packet buffer instead.
+	All callers adjusted.
+	(_initialize_remote): Remove references to target_buf and
+	target_buf_size.
+
 2017-09-28  Pedro Alves  <palves@redhat.com>
 
 	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add
diff --git a/gdb/remote.c b/gdb/remote.c
index d4f06a8..a0c6f6c 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -76,10 +76,6 @@
 #include "environ.h"
 #include "common/byte-vector.h"
 
-/* Temp hacks for tracepoint encoding migration.  */
-static char *target_buf;
-static long target_buf_size;
-
 /* Per-program-space data key.  */
 static const struct program_space_data *remote_pspace_data;
 
@@ -238,6 +234,8 @@ static void readahead_cache_invalidate (void);
 
 static void remote_unpush_and_throw (void);
 
+static struct remote_state *get_remote_state (void);
+
 /* For "remote".  */
 
 static struct cmd_list_element *remote_cmdlist;
@@ -575,17 +573,19 @@ trace_error (char *buf)
 }
 
 /* Utility: wait for reply from stub, while accepting "O" packets.  */
+
 static char *
-remote_get_noisy_reply (char **buf_p,
-			long *sizeof_buf)
+remote_get_noisy_reply ()
 {
+  struct remote_state *rs = get_remote_state ();
+
   do				/* Loop on reply from remote stub.  */
     {
       char *buf;
 
       QUIT;			/* Allow user to bail out with ^C.  */
-      getpkt (buf_p, sizeof_buf, 0);
-      buf = *buf_p;
+      getpkt (&rs->buf, &rs->buf_size, 0);
+      buf = rs->buf;
       if (buf[0] == 'E')
 	trace_error (buf);
       else if (startswith (buf, "qRelocInsn:"))
@@ -638,7 +638,7 @@ remote_get_noisy_reply (char **buf_p,
 	    {
 	      adjusted_size = to - org_to;
 
-	      xsnprintf (buf, *sizeof_buf, "qRelocInsn:%x", adjusted_size);
+	      xsnprintf (buf, rs->buf_size, "qRelocInsn:%x", adjusted_size);
 	      putpkt (buf);
 	    }
 	}
@@ -9523,7 +9523,7 @@ extended_remote_disable_randomization (int val)
   xsnprintf (rs->buf, get_remote_packet_size (), "QDisableRandomization:%x",
 	     val);
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+  reply = remote_get_noisy_reply ();
   if (*reply == '\0')
     error (_("Target does not support QDisableRandomization."));
   if (strcmp (reply, "OK") != 0)
@@ -12250,9 +12250,11 @@ remote_can_run_breakpoint_commands (struct target_ops *self)
 static void
 remote_trace_init (struct target_ops *self)
 {
+  struct remote_state *rs = get_remote_state ();
+
   putpkt ("QTinit");
-  remote_get_noisy_reply (&target_buf, &target_buf_size);
-  if (strcmp (target_buf, "OK") != 0)
+  remote_get_noisy_reply ();
+  if (strcmp (rs->buf, "OK") != 0)
     error (_("Target does not support this command."));
 }
 
@@ -12296,8 +12298,8 @@ remote_download_command_source (int num, ULONGEST addr,
 			    rs->buf + strlen (rs->buf),
 			    rs->buf_size - strlen (rs->buf));
       putpkt (rs->buf);
-      remote_get_noisy_reply (&target_buf, &target_buf_size);
-      if (strcmp (target_buf, "OK"))
+      remote_get_noisy_reply ();
+      if (strcmp (rs->buf, "OK"))
 	warning (_("Target does not support source download."));
 
       if (cmd->control_type == while_control
@@ -12311,8 +12313,8 @@ remote_download_command_source (int num, ULONGEST addr,
 				rs->buf + strlen (rs->buf),
 				rs->buf_size - strlen (rs->buf));
 	  putpkt (rs->buf);
-	  remote_get_noisy_reply (&target_buf, &target_buf_size);
-	  if (strcmp (target_buf, "OK"))
+	  remote_get_noisy_reply ();
+	  if (strcmp (rs->buf, "OK"))
 	    warning (_("Target does not support source download."));
 	}
     }
@@ -12333,6 +12335,7 @@ remote_download_tracepoint (struct target_ops *self, struct bp_location *loc)
   char *pkt;
   struct breakpoint *b = loc->owner;
   struct tracepoint *t = (struct tracepoint *) b;
+  struct remote_state *rs = get_remote_state ();
 
   encode_actions_rsp (loc, &tdp_actions, &stepping_actions);
   old_chain = make_cleanup (free_actions_list_cleanup_wrapper,
@@ -12416,8 +12419,8 @@ remote_download_tracepoint (struct target_ops *self, struct bp_location *loc)
   if (b->commands || *default_collect)
     strcat (buf, "-");
   putpkt (buf);
-  remote_get_noisy_reply (&target_buf, &target_buf_size);
-  if (strcmp (target_buf, "OK"))
+  remote_get_noisy_reply ();
+  if (strcmp (rs->buf, "OK"))
     error (_("Target does not support tracepoints."));
 
   /* do_single_steps (t); */
@@ -12432,9 +12435,8 @@ remote_download_tracepoint (struct target_ops *self, struct bp_location *loc)
 		     ((tdp_actions[ndx + 1] || stepping_actions)
 		      ? '-' : 0));
 	  putpkt (buf);
-	  remote_get_noisy_reply (&target_buf,
-				  &target_buf_size);
-	  if (strcmp (target_buf, "OK"))
+	  remote_get_noisy_reply ();
+	  if (strcmp (rs->buf, "OK"))
 	    error (_("Error on target while setting tracepoints."));
 	}
     }
@@ -12449,9 +12451,8 @@ remote_download_tracepoint (struct target_ops *self, struct bp_location *loc)
 		     stepping_actions[ndx],
 		     (stepping_actions[ndx + 1] ? "-" : ""));
 	  putpkt (buf);
-	  remote_get_noisy_reply (&target_buf,
-				  &target_buf_size);
-	  if (strcmp (target_buf, "OK"))
+	  remote_get_noisy_reply ();
+	  if (strcmp (rs->buf, "OK"))
 	    error (_("Error on target while setting tracepoints."));
 	}
     }
@@ -12465,8 +12466,8 @@ remote_download_tracepoint (struct target_ops *self, struct bp_location *loc)
 				event_location_to_string (b->location.get ()),
 				buf + strlen (buf), 2048 - strlen (buf));
 	  putpkt (buf);
-	  remote_get_noisy_reply (&target_buf, &target_buf_size);
-	  if (strcmp (target_buf, "OK"))
+	  remote_get_noisy_reply ();
+	  if (strcmp (rs->buf, "OK"))
 	    warning (_("Target does not support source download."));
 	}
       if (b->cond_string)
@@ -12476,8 +12477,8 @@ remote_download_tracepoint (struct target_ops *self, struct bp_location *loc)
 				"cond", b->cond_string, buf + strlen (buf),
 				2048 - strlen (buf));
 	  putpkt (buf);
-	  remote_get_noisy_reply (&target_buf, &target_buf_size);
-	  if (strcmp (target_buf, "OK"))
+	  remote_get_noisy_reply ();
+	  if (strcmp (rs->buf, "OK"))
 	    warning (_("Target does not support source download."));
 	}
       remote_download_command_source (b->number, loc->address,
@@ -12531,10 +12532,10 @@ remote_download_trace_state_variable (struct target_ops *self,
   p += 2 * bin2hex ((gdb_byte *) (tsv->name), p, strlen (tsv->name));
   *p++ = '\0';
   putpkt (rs->buf);
-  remote_get_noisy_reply (&target_buf, &target_buf_size);
-  if (*target_buf == '\0')
+  remote_get_noisy_reply ();
+  if (*rs->buf == '\0')
     error (_("Target does not support this command."));
-  if (strcmp (target_buf, "OK") != 0)
+  if (strcmp (rs->buf, "OK") != 0)
     error (_("Error on target while downloading trace state variable."));
 }
 
@@ -12549,7 +12550,7 @@ remote_enable_tracepoint (struct target_ops *self,
   xsnprintf (rs->buf, get_remote_packet_size (), "QTEnable:%x:%s",
 	     location->owner->number, addr_buf);
   putpkt (rs->buf);
-  remote_get_noisy_reply (&rs->buf, &rs->buf_size);
+  remote_get_noisy_reply ();
   if (*rs->buf == '\0')
     error (_("Target does not support enabling tracepoints while a trace run is ongoing."));
   if (strcmp (rs->buf, "OK") != 0)
@@ -12567,7 +12568,7 @@ remote_disable_tracepoint (struct target_ops *self,
   xsnprintf (rs->buf, get_remote_packet_size (), "QTDisable:%x:%s",
 	     location->owner->number, addr_buf);
   putpkt (rs->buf);
-  remote_get_noisy_reply (&rs->buf, &rs->buf_size);
+  remote_get_noisy_reply ();
   if (*rs->buf == '\0')
     error (_("Target does not support disabling tracepoints while a trace run is ongoing."));
   if (strcmp (rs->buf, "OK") != 0)
@@ -12587,8 +12588,10 @@ remote_trace_set_readonly_regions (struct target_ops *self)
   if (!exec_bfd)
     return;			/* No information to give.  */
 
-  strcpy (target_buf, "QTro");
-  offset = strlen (target_buf);
+  struct remote_state *rs = get_remote_state ();
+
+  strcpy (rs->buf, "QTro");
+  offset = strlen (rs->buf);
   for (s = exec_bfd->sections; s; s = s->next)
     {
       char tmp1[40], tmp2[40];
@@ -12605,33 +12608,35 @@ remote_trace_set_readonly_regions (struct target_ops *self)
       sprintf_vma (tmp1, vma);
       sprintf_vma (tmp2, vma + size);
       sec_length = 1 + strlen (tmp1) + 1 + strlen (tmp2);
-      if (offset + sec_length + 1 > target_buf_size)
+      if (offset + sec_length + 1 > rs->buf_size)
 	{
 	  if (packet_support (PACKET_qXfer_traceframe_info) != PACKET_ENABLE)
 	    warning (_("\
 Too many sections for read-only sections definition packet."));
 	  break;
 	}
-      xsnprintf (target_buf + offset, target_buf_size - offset, ":%s,%s",
+      xsnprintf (rs->buf + offset, rs->buf_size - offset, ":%s,%s",
 		 tmp1, tmp2);
       offset += sec_length;
     }
   if (anysecs)
     {
-      putpkt (target_buf);
-      getpkt (&target_buf, &target_buf_size, 0);
+      putpkt (rs->buf);
+      getpkt (&rs->buf, &rs->buf_size, 0);
     }
 }
 
 static void
 remote_trace_start (struct target_ops *self)
 {
+  struct remote_state *rs = get_remote_state ();
+
   putpkt ("QTStart");
-  remote_get_noisy_reply (&target_buf, &target_buf_size);
-  if (*target_buf == '\0')
+  remote_get_noisy_reply ();
+  if (*rs->buf == '\0')
     error (_("Target does not support this command."));
-  if (strcmp (target_buf, "OK") != 0)
-    error (_("Bogus reply from target: %s"), target_buf);
+  if (strcmp (rs->buf, "OK") != 0)
+    error (_("Bogus reply from target: %s"), rs->buf);
 }
 
 static int
@@ -12642,6 +12647,7 @@ remote_get_trace_status (struct target_ops *self, struct trace_status *ts)
   /* FIXME we need to get register block size some other way.  */
   extern int trace_regblock_size;
   enum packet_result result;
+  struct remote_state *rs = get_remote_state ();
 
   if (packet_support (PACKET_qTStatus) == PACKET_DISABLE)
     return -1;
@@ -12652,7 +12658,7 @@ remote_get_trace_status (struct target_ops *self, struct trace_status *ts)
 
   TRY
     {
-      p = remote_get_noisy_reply (&target_buf, &target_buf_size);
+      p = remote_get_noisy_reply ();
     }
   CATCH (ex, RETURN_MASK_ERROR)
     {
@@ -12675,7 +12681,7 @@ remote_get_trace_status (struct target_ops *self, struct trace_status *ts)
   ts->filename = NULL;
 
   if (*p++ != 'T')
-    error (_("Bogus trace status reply from target: %s"), target_buf);
+    error (_("Bogus trace status reply from target: %s"), rs->buf);
 
   /* Function 'parse_trace_status' sets default value of each field of
      'ts' at first, so we don't have to do it here.  */
@@ -12707,7 +12713,7 @@ remote_get_tracepoint_status (struct target_ops *self, struct breakpoint *bp,
 	  xsnprintf (rs->buf, size, "qTP:%x:%s", tp->number_on_target,
 		     phex_nz (loc->address, 0));
 	  putpkt (rs->buf);
-	  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+	  reply = remote_get_noisy_reply ();
 	  if (reply && *reply)
 	    {
 	      if (*reply == 'V')
@@ -12722,7 +12728,7 @@ remote_get_tracepoint_status (struct target_ops *self, struct breakpoint *bp,
       xsnprintf (rs->buf, size, "qTP:%x:%s", utp->number,
 		 phex_nz (utp->addr, 0));
       putpkt (rs->buf);
-      reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+      reply = remote_get_noisy_reply ();
       if (reply && *reply)
 	{
 	  if (*reply == 'V')
@@ -12734,12 +12740,14 @@ remote_get_tracepoint_status (struct target_ops *self, struct breakpoint *bp,
 static void
 remote_trace_stop (struct target_ops *self)
 {
+  struct remote_state *rs = get_remote_state ();
+
   putpkt ("QTStop");
-  remote_get_noisy_reply (&target_buf, &target_buf_size);
-  if (*target_buf == '\0')
+  remote_get_noisy_reply ();
+  if (*rs->buf == '\0')
     error (_("Target does not support this command."));
-  if (strcmp (target_buf, "OK") != 0)
-    error (_("Bogus reply from target: %s"), target_buf);
+  if (strcmp (rs->buf, "OK") != 0)
+    error (_("Bogus reply from target: %s"), rs->buf);
 }
 
 static int
@@ -12786,7 +12794,7 @@ remote_trace_find (struct target_ops *self,
     }
 
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&(rs->buf), &rs->buf_size);
+  reply = remote_get_noisy_reply ();
   if (*reply == '\0')
     error (_("Target does not support this command."));
 
@@ -12837,7 +12845,7 @@ remote_get_trace_state_variable_value (struct target_ops *self,
 
   xsnprintf (rs->buf, get_remote_packet_size (), "qTV:%x", tsvnum);
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+  reply = remote_get_noisy_reply ();
   if (reply && *reply)
     {
       if (*reply == 'V')
@@ -12864,7 +12872,7 @@ remote_save_trace_data (struct target_ops *self, const char *filename)
   p += 2 * bin2hex ((gdb_byte *) filename, p, strlen (filename));
   *p++ = '\0';
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+  reply = remote_get_noisy_reply ();
   if (*reply == '\0')
     error (_("Target does not support this command."));
   if (strcmp (reply, "OK") != 0)
@@ -12895,7 +12903,7 @@ remote_get_raw_trace_data (struct target_ops *self,
   *p++ = '\0';
 
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+  reply = remote_get_noisy_reply ();
   if (reply && *reply)
     {
       /* 'l' by itself means we're at the end of the buffer and
@@ -12908,7 +12916,7 @@ remote_get_raw_trace_data (struct target_ops *self,
 	 what was returned in the packet; if the target is
 	 unexpectedly generous and gives us a bigger reply than we
 	 asked for, we don't want to crash.  */
-      rslt = hex2bin (target_buf, buf, len);
+      rslt = hex2bin (reply, buf, len);
       return rslt;
     }
 
@@ -12927,7 +12935,7 @@ remote_set_disconnected_tracing (struct target_ops *self, int val)
 
       xsnprintf (rs->buf, get_remote_packet_size (), "QTDisconnected:%x", val);
       putpkt (rs->buf);
-      reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+      reply = remote_get_noisy_reply ();
       if (*reply == '\0')
 	error (_("Target does not support this command."));
       if (strcmp (reply, "OK") != 0)
@@ -12955,7 +12963,7 @@ remote_set_circular_trace_buffer (struct target_ops *self, int val)
 
   xsnprintf (rs->buf, get_remote_packet_size (), "QTBuffer:circular:%x", val);
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+  reply = remote_get_noisy_reply ();
   if (*reply == '\0')
     error (_("Target does not support this command."));
   if (strcmp (reply, "OK") != 0)
@@ -13003,7 +13011,7 @@ remote_get_min_fast_tracepoint_insn_len (struct target_ops *self)
 
   xsnprintf (rs->buf, get_remote_packet_size (), "qTMinFTPILen");
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+  reply = remote_get_noisy_reply ();
   if (*reply == '\0')
     return -1;
   else
@@ -13038,7 +13046,7 @@ remote_set_trace_buffer_size (struct target_ops *self, LONGEST val)
 	buf += hexnumstr (buf, (ULONGEST) val);
 
       putpkt (rs->buf);
-      remote_get_noisy_reply (&rs->buf, &rs->buf_size);
+      remote_get_noisy_reply ();
       result = packet_ok (rs->buf,
 		  &remote_protocol_packets[PACKET_QTBuffer_size]);
 
@@ -13084,7 +13092,7 @@ remote_set_trace_notes (struct target_ops *self,
   *buf = '\0';
 
   putpkt (rs->buf);
-  reply = remote_get_noisy_reply (&target_buf, &target_buf_size);
+  reply = remote_get_noisy_reply ();
   if (*reply == '\0')
     return 0;
 
@@ -14518,8 +14526,4 @@ stepping is supported by the target.  The default is on."),
   magic_null_ptid = ptid_build (42000, -1, 1);
   not_sent_ptid = ptid_build (42000, -2, 1);
   any_thread_ptid = ptid_build (42000, 0, 1);
-
-  target_buf_size = 2048;
-  target_buf = (char *) xmalloc (target_buf_size);
 }
-