guile: Add 'history-append!' procedure.

gdb/
2014-02-26  Ludovic Courtès  <ludo@gnu.org>

	* guile/scm-value.c (gdbscm_history_append_x): New function.
	(value_functions): Add it.

gdb/testsuite/
2014-02-26  Ludovic Courtès  <ludo@gnu.org>

	* gdb.guile/scm-value.exp (test_value_in_inferior): Add
	test for 'history-append!'.

gdb/doc/
2014-02-26  Ludovic Courtès  <ludo@gnu.org>

	* gdb/doc/guile.texi (Basic Guile): Document 'history-append!'.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2014-02-26  Ludovic Courtès  <ludo@gnu.org>
+
+	* guile/scm-value.c (gdbscm_history_append_x): New function.
+	(value_functions): Add it.
+
 2014-02-27  Joel Brobecker  <brobecker@adacore.com>
 
 	* dwarf2read.c (attr_value_as_address): New function.

gdb/doc/ChangeLog

@@ -1,3 +1,7 @@
+2014-02-26  Ludovic Courtès  <ludo@gnu.org>
+
+	* gdb/doc/guile.texi (Basic Guile): Document 'history-append!'.
+
 2014-02-20  Joel Brobecker  <brobecker@adacore.com>
 
 	* gdb.texinfo (Files): Document "add-shared-symbol-files"

gdb/doc/guile.texi

@@ -278,6 +278,15 @@ history contains the result of evaluating an expression from Guile's
 command line.
 @end deffn
 
+@deffn {Scheme Procedure} history-append! value
+Append @var{value}, an instance of @code{<gdb:value>}, to @value{GDBN}'s
+value history.  Return its index in the history.
+
+Putting into history values returned by Guile extensions will allow
+the user convenient access to those values via CLI history
+facilities.
+@end deffn
+
 @deffn {Scheme Procedure} parse-and-eval expression
 Parse @var{expression} as an expression in the current language,
 evaluate it, and return the result as a @code{<gdb:value>}.

gdb/guile/scm-value.c

@@ -1297,6 +1297,27 @@ gdbscm_history_ref (SCM index)
 
   return vlscm_scm_from_value (res_val);
 }
+
+/* (history-append! <gdb:value>) -> index
+   Append VALUE to GDB's value history.  Return its index in the history.  */
+
+static SCM
+gdbscm_history_append_x (SCM value)
+{
+  int res_index = -1;
+  struct value *v;
+  volatile struct gdb_exception except;
+
+  v = vlscm_scm_to_value (value);
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      res_index = record_latest_value (v);
+    }
+  GDBSCM_HANDLE_GDB_EXCEPTION (except);
+
+  return scm_from_int (res_index);
+}
 
 /* Initialize the Scheme value code.  */
 
@@ -1459,6 +1480,10 @@ Evaluates string in gdb and returns the result as a <gdb:value> object." },
     "\
 Return the specified value from GDB's value history." },
 
+  { "history-append!", 1, 0, 0, gdbscm_history_append_x,
+    "\
+Append the specified value onto GDB's value history." },
+
   END_FUNCTIONS
 };
 

gdb/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2014-02-26  Ludovic Courtès  <ludo@gnu.org>
+
+	* gdb.guile/scm-value.exp (test_value_in_inferior): Add
+	test for 'history-append!'.
+
 2014-02-26  Joel Brobecker  <brobecker@adacore.com>
 
 	* gdb.dwarf2/dw2-abs-hi-pc-hello-dbg.S: New file.

gdb/testsuite/gdb.guile/scm-value.exp

@@ -59,6 +59,14 @@ proc test_value_in_inferior {} {
     gdb_test "gu (print (value-field s \"a\"))" \
 	"= 3" "access element inside struct using string name"
 
+    # Append value in the value history.
+    gdb_scm_test_silent_cmd "gu (define i (history-append! (make-value 42)))" \
+	"append 42"
+
+    gdb_test "gu i" "\[0-9\]+"
+    gdb_test "gu (history-ref i)" "#<gdb:value 42>"
+    gdb_test "p \$" "= 42"
+
     # Test dereferencing the argv pointer.
 
     # Just get inferior variable argv the value history, available to guile.