Re: PATCH: Add xmlRegisters= to qsupported query

["H.J. Lu" <hongjiu.lu@intel.com>]

On Sun, Mar 28, 2010 at 04:46:43PM -0700, H.J. Lu wrote:
> On Sun, Mar 28, 2010 at 01:52:07PM -0700, H.J. Lu wrote:
> > On Sun, Mar 28, 2010 at 01:48:07PM -0700, H.J. Lu wrote:
> > > Hi,
> > > 
> > > This patch adds xmlRegisters= to qsupported query.  Any comments?
> > > 
> > > Thanks.
> > > 
> > > 
> > 
> > An updated patch.
> > 
> > 
> 
> Here is a new patch to simplify extending qsupported query and fix a
> memory leak.  Any comments?
> 

This patch updated documentation based on Eli's feedbacks. OK to
install?

Thanks.


H.J.
---
gdb/

2010-03-29  H.J. Lu  <hongjiu.lu@intel.com>

	* i386-tdep.c: Include "remote.h".
	(i386_gdbarch_init): Call register_remote_support_xml.

	* remote.c (remote_support_xml): New.
	(register_remote_support_xml): Likewise.
	(remote_query_supported_append): Likewise.
	(remote_query_supported): Support remote_support_xml.

	* remote.h (register_remote_support_xml): New.

gdb/doc/

2010-03-29  H.J. Lu  <hongjiu.lu@intel.com>

	* gdb.texinfo (General Query Packets): Add xmlRegisters.


diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 56dbe5d..15da725 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -30603,6 +30603,13 @@ extensions to the remote protocol.  @value{GDBN} does not use such
 extensions unless the stub also reports that it supports them by
 including @samp{multiprocess+} in its @samp{qSupported} reply.
 @xref{multiprocess extensions}, for details.
+
+@item xmlRegisters
+This feature indicates that @value{GDBN} supports the XML target
+description.  If the stub sees @samp{xmlRegisters=} with target
+specific strings separated by a comma, it will send either an XML
+target description or an XML stub that states only the architecture
+and the OSABI.
 @end table
 
 Stubs should ignore any unknown values for
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index 83275ac..d7af84a 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -44,6 +44,7 @@
 #include "value.h"
 #include "dis-asm.h"
 #include "disasm.h"
+#include "remote.h"
 
 #include "gdb_assert.h"
 #include "gdb_string.h"
@@ -5943,6 +5944,9 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_gdbarch_fast_tracepoint_valid_at (gdbarch,
 					i386_fast_tracepoint_valid_at);
 
+  /* Tell remote stub that we support XML target description.  */
+  register_remote_support_xml ("x86");
+
   return gdbarch;
 }
 
diff --git a/gdb/remote.c b/gdb/remote.c
index 0c791aa..2dcf079 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -3464,6 +3464,55 @@ static struct protocol_feature remote_protocol_features[] = {
     PACKET_bs },
 };
 
+static char *remote_support_xml;
+
+/* Register string appended to "xmlRegisters=" in qSupported query.  */
+
+void
+register_remote_support_xml (const char *xml)
+{
+  if (remote_support_xml == NULL)
+    remote_support_xml = concat ("xmlRegisters=", xml, NULL);
+  else
+    {
+      const char *str = strstr (remote_support_xml, xml);
+      int append;
+
+      if (str)
+	{
+	  if (str != remote_support_xml && *(str - 1) != ',')
+	    append = 0;
+	  else
+	    {
+	      size_t len = strlen (xml);
+	      append = xml[len] != ',' && xml[len] != '\0';
+	    }
+	}
+      else
+	append = 1;
+
+      if (append)
+	{
+	  char *p = concat (remote_support_xml, ",", xml, NULL);
+	  xfree (remote_support_xml);
+	  remote_support_xml = p;
+	}
+    }
+}
+
+static char *
+remote_query_supported_append (char *msg, const char *append)
+{
+  if (msg)
+    {
+      char *p = concat (msg, ";", append, NULL);
+      xfree (msg);
+      return p;
+    }
+  else
+    return xstrdup (append);
+}
+
 static void
 remote_query_supported (void)
 {
@@ -3482,24 +3531,27 @@ remote_query_supported (void)
   rs->buf[0] = 0;
   if (remote_protocol_packets[PACKET_qSupported].support != PACKET_DISABLE)
     {
+      char *q = NULL;
       const char *qsupported = gdbarch_qsupported (target_gdbarch);
+
+      if (rs->extended)
+	q = remote_query_supported_append (q, "multiprocess+;");
+      
       if (qsupported)
+	q = remote_query_supported_append (q, qsupported);
+
+      if (remote_support_xml)
+	q = remote_query_supported_append (q, remote_support_xml);
+
+      if (q)
 	{
-	  char *q;
-	  if (rs->extended)
-	    q = concat ("qSupported:multiprocess+;", qsupported, NULL);
-	  else
-	    q = concat ("qSupported:", qsupported, NULL);
-	  putpkt (q);
+	  char *p = concat ("qSupported:", q, NULL);
 	  xfree (q);
+	  putpkt (p);
+	  xfree (p);
 	}
       else
-	{
-	  if (rs->extended)
-	    putpkt ("qSupported:multiprocess+");
-	  else
-	    putpkt ("qSupported");
-	}
+	putpkt ("qSupported");
 
       getpkt (&rs->buf, &rs->buf_size, 0);
 
diff --git a/gdb/remote.h b/gdb/remote.h
index a82d0d7..d480e26 100644
--- a/gdb/remote.h
+++ b/gdb/remote.h
@@ -66,6 +66,7 @@ extern void (*deprecated_target_wait_loop_hook) (void);
 
 void register_remote_g_packet_guess (struct gdbarch *gdbarch, int bytes,
 				     const struct target_desc *tdesc);
+void register_remote_support_xml (const char *);
 
 void remote_file_put (const char *local_file, const char *remote_file,
 		      int from_tty);