gdb.trace: Save XML target description in tfile.

gdb/ChangeLog:

	* ctf.c (ctf_write_tdesc): New function.
	(ctf_write_ops): Wire in ctf_write_tdesc.
	* tracefile-tfile.c (tfile_write_tdesc): New function.
	(tfile_write_ops): Wire in tfile_write_tdesc.
	* tracefile.c (trace_save): Call write_tdesc method.
	* tracefile.h (struct trace_file_write_ops): Add write_tdesc method.
	* xml-tdesc.c (target_fetch_description_xml): New function.
	* xml-tdesc.h: Add target_fetch_description_xml prototype.

gdb/ChangeLog

@@ -1,3 +1,14 @@
+2016-02-10  Marcin Kościelnicki  <koriakin@0x04.net>
+
+	* ctf.c (ctf_write_tdesc): New function.
+	(ctf_write_ops): Wire in ctf_write_tdesc.
+	* tracefile-tfile.c (tfile_write_tdesc): New function.
+	(tfile_write_ops): Wire in tfile_write_tdesc.
+	* tracefile.c (trace_save): Call write_tdesc method.
+	* tracefile.h (struct trace_file_write_ops): Add write_tdesc method.
+	* xml-tdesc.c (target_fetch_description_xml): New function.
+	* xml-tdesc.h: Add target_fetch_description_xml prototype.
+
 2016-02-10  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* arm-tdep.c (arm_copy_extra_ld_st): Fix "unpriveleged" typo.

gdb/ctf.c

@@ -616,6 +616,15 @@ ctf_write_uploaded_tp (struct trace_file_writer *self,
 
 }
 
+/* This is the implementation of trace_file_write_ops method
+   write_tdesc.  */
+
+static void
+ctf_write_tdesc (struct trace_file_writer *self)
+{
+  /* Nothing so far. */
+}
+
 /* This is the implementation of trace_file_write_ops method
    write_definition_end.  */
 
@@ -799,6 +808,7 @@ static const struct trace_file_write_ops ctf_write_ops =
   ctf_write_status,
   ctf_write_uploaded_tsv,
   ctf_write_uploaded_tp,
+  ctf_write_tdesc,
   ctf_write_definition_end,
   NULL,
   &ctf_write_frame_ops,

gdb/tracefile-tfile.c

@@ -29,6 +29,7 @@
 #include "completer.h"
 #include "filenames.h"
 #include "remote.h"
+#include "xml-tdesc.h"
 
 #ifndef O_LARGEFILE
 #define O_LARGEFILE 0
@@ -263,6 +264,42 @@ tfile_write_uploaded_tp (struct trace_file_writer *self,
 		    sizeof (utp->traceframe_usage)));
 }
 
+/* This is the implementation of trace_file_write_ops method
+   write_tdesc.  */
+
+static void
+tfile_write_tdesc (struct trace_file_writer *self)
+{
+  struct tfile_trace_file_writer *writer
+    = (struct tfile_trace_file_writer *) self;
+  char *tdesc = target_fetch_description_xml (&current_target);
+  char *ptr = tdesc;
+  char *next;
+
+  if (tdesc == NULL)
+    return;
+
+  /* Write tdesc line by line, prefixing each line with "tdesc ".  */
+  while (ptr != NULL)
+    {
+      next = strchr (ptr, '\n');
+      if (next != NULL)
+	{
+	  fprintf (writer->fp, "tdesc %.*s\n", (int) (next - ptr), ptr);
+	  /* Skip the \n.  */
+	  next++;
+	}
+      else if (*ptr != '\0')
+	{
+	  /* Last line, doesn't have a newline.  */
+	  fprintf (writer->fp, "tdesc %s\n", ptr);
+	}
+      ptr = next;
+    }
+
+  xfree (tdesc);
+}
+
 /* This is the implementation of trace_file_write_ops method
    write_definition_end.  */
 
@@ -316,6 +353,7 @@ static const struct trace_file_write_ops tfile_write_ops =
   tfile_write_status,
   tfile_write_uploaded_tsv,
   tfile_write_uploaded_tp,
+  tfile_write_tdesc,
   tfile_write_definition_end,
   tfile_write_raw_data,
   NULL,

gdb/tracefile.c

@@ -90,6 +90,9 @@ trace_save (const char *filename, struct trace_file_writer *writer,
   /* Write out the size of a register block.  */
   writer->ops->write_regblock_type (writer, trace_regblock_size);
 
+  /* Write out the target description info.  */
+  writer->ops->write_tdesc (writer);
+
   /* Write out status of the tracing run (aka "tstatus" info).  */
   writer->ops->write_status (writer, ts);
 

gdb/tracefile.h

@@ -84,6 +84,9 @@ struct trace_file_write_ops
   void (*write_uploaded_tp) (struct trace_file_writer *self,
 			     struct uploaded_tp *tp);
 
+  /* Write target description.  */
+  void (*write_tdesc) (struct trace_file_writer *self);
+
   /* Write to mark the end of the definition part.  */
   void (*write_definition_end) (struct trace_file_writer *self);
 

gdb/xml-tdesc.c

@@ -630,3 +630,33 @@ target_read_description_xml (struct target_ops *ops)
 
   return tdesc;
 }
+
+/* Fetches an XML target description using OPS,  processing
+   includes, but not parsing it.  Used to dump whole tdesc
+   as a single XML file.  */
+
+char *
+target_fetch_description_xml (struct target_ops *ops)
+{
+  struct target_desc *tdesc;
+  char *tdesc_str;
+  char *expanded_text;
+  struct cleanup *back_to;
+
+  tdesc_str = fetch_available_features_from_target ("target.xml", ops);
+  if (tdesc_str == NULL)
+    return NULL;
+
+  back_to = make_cleanup (xfree, tdesc_str);
+  expanded_text = xml_process_xincludes (_("target description"),
+					 tdesc_str,
+					 fetch_available_features_from_target, ops, 0);
+  do_cleanups (back_to);
+  if (expanded_text == NULL)
+    {
+      warning (_("Could not load XML target description; ignoring"));
+      return NULL;
+    }
+
+  return expanded_text;
+}

gdb/xml-tdesc.h

@@ -31,3 +31,9 @@ const struct target_desc *file_read_description_xml (const char *filename);
    parsed description.  */
 
 const struct target_desc *target_read_description_xml (struct target_ops *);
+
+/* Fetches an XML target description using OPS,  processing
+   includes, but not parsing it.  Used to dump whole tdesc
+   as a single XML file.  */
+
+char *target_fetch_description_xml (struct target_ops *ops);