btrace: Export btrace_decode_error function.

Signed-off-by: Tim Wiederhake <tim.wiederhake@intel.com>

gdb/ChangeLog:

	* record-btrace.c (btrace_ui_out_decode_error): Move most of it ...
	* btrace.c (btrace_decode_error): ... here.  New function.
	* btrace.h (btrace_decode_error): New export.

Change-Id: I2b4b43a55dbfd9f526a540d2ad52a6708f31feba

3 files changed, 57 insertions, 55 deletions

diff --git a/gdb/btrace.c b/gdb/btrace.c
index 9f5657df86..06122cdfbb 100644
--- a/gdb/btrace.c
+++ b/gdb/btrace.c
@@ -1725,6 +1725,55 @@ btrace_maint_clear (struct btrace_thread_info *btinfo)
 
 /* See btrace.h.  */
 
+const char *
+btrace_decode_error (enum btrace_format format, int errcode)
+{
+  switch (format)
+    {
+    case BTRACE_FORMAT_BTS:
+      switch (errcode)
+	{
+	case BDE_BTS_OVERFLOW:
+	  return _("instruction overflow");
+
+	case BDE_BTS_INSN_SIZE:
+	  return _("unknown instruction");
+
+	default:
+	  break;
+	}
+      break;
+
+#if defined (HAVE_LIBIPT)
+    case BTRACE_FORMAT_PT:
+      switch (errcode)
+	{
+	case BDE_PT_USER_QUIT:
+	  return _("trace decode cancelled");
+
+	case BDE_PT_DISABLED:
+	  return _("disabled");
+
+	case BDE_PT_OVERFLOW:
+	  return _("overflow");
+
+	default:
+	  if (errcode < 0)
+	    return pt_errstr (pt_errcode (errcode));
+	  break;
+	}
+      break;
+#endif /* defined (HAVE_LIBIPT)  */
+
+    default:
+      break;
+    }
+
+  return _("unknown");
+}
+
+/* See btrace.h.  */
+
 void
 btrace_fetch (struct thread_info *tp)
 {
diff --git a/gdb/btrace.h b/gdb/btrace.h
index f9af46c257..1c0b6b3896 100644
--- a/gdb/btrace.h
+++ b/gdb/btrace.h
@@ -384,6 +384,11 @@ extern void btrace_disable (struct thread_info *);
    target_teardown_btrace instead of target_disable_btrace.  */
 extern void btrace_teardown (struct thread_info *);
 
+/* Return a human readable error string for the given ERRCODE in FORMAT.
+   The pointer will never be NULL and must not be freed.  */
+
+extern const char *btrace_decode_error (enum btrace_format format, int errcode);
+
 /* Fetch the branch trace for a single thread.  */
 extern void btrace_fetch (struct thread_info *);
 
diff --git a/gdb/record-btrace.c b/gdb/record-btrace.c
index 1dbf5d88c2..19b9222c24 100644
--- a/gdb/record-btrace.c
+++ b/gdb/record-btrace.c
@@ -468,63 +468,11 @@ static void
 btrace_ui_out_decode_error (struct ui_out *uiout, int errcode,
 			    enum btrace_format format)
 {
-  const char *errstr;
-  int is_error;
-
-  errstr = _("unknown");
-  is_error = 1;
-
-  switch (format)
-    {
-    default:
-      break;
-
-    case BTRACE_FORMAT_BTS:
-      switch (errcode)
-	{
-	default:
-	  break;
-
-	case BDE_BTS_OVERFLOW:
-	  errstr = _("instruction overflow");
-	  break;
-
-	case BDE_BTS_INSN_SIZE:
-	  errstr = _("unknown instruction");
-	  break;
-	}
-      break;
-
-#if defined (HAVE_LIBIPT)
-    case BTRACE_FORMAT_PT:
-      switch (errcode)
-	{
-	case BDE_PT_USER_QUIT:
-	  is_error = 0;
-	  errstr = _("trace decode cancelled");
-	  break;
-
-	case BDE_PT_DISABLED:
-	  is_error = 0;
-	  errstr = _("disabled");
-	  break;
-
-	case BDE_PT_OVERFLOW:
-	  is_error = 0;
-	  errstr = _("overflow");
-	  break;
-
-	default:
-	  if (errcode < 0)
-	    errstr = pt_errstr (pt_errcode (errcode));
-	  break;
-	}
-      break;
-#endif /* defined (HAVE_LIBIPT)  */
-    }
+  const char *errstr = btrace_decode_error (format, errcode);
 
   uiout->text (_("["));
-  if (is_error)
+  /* ERRCODE > 0 indicates notifications on BTRACE_FORMAT_PT.  */
+  if (!(format == BTRACE_FORMAT_PT && errcode > 0))
     {
       uiout->text (_("decode error ("));
       uiout->field_int ("errcode", errcode);