[gdb] Add debug_{exp,val}

When debugging cc1 I heavily rely on simple one-parameter debug functions
that allow me to inspect a variable of a common type, like:
- debug_generic_expr
- debug_gimple_stmt
- debug_rtx
and I miss similar functions in gdb.

Add functions to dump variables of types 'value' and 'expression':
- debug_exp, and
- debug_val.

Tested on x86_64-linux, by breaking on varobj_create, and doing:
...
(gdb) call debug_exp (var->root->exp.get ())
&"Operation: OP_VAR_VALUE\n"
&" Block symbol:\n"
&"  Symbol: aaa\n"
&"  Block: 0x2d064f0\n"
(gdb)
...
and:
...
(gdb) call debug_val (value)
&"5"
(gdb)
...

1 files changed, 12 insertions, 0 deletions

diff --git a/gdb/valprint.c b/gdb/valprint.c
index f873e12..3ad4c0c 100644
--- a/gdb/valprint.c
+++ b/gdb/valprint.c
@@ -1190,6 +1190,18 @@ value_print (struct value *val, struct ui_file *stream,
   current_language->value_print (val, stream, options);
 }
 
+/* Meant to be used in debug sessions, so don't export it in a header file.  */
+extern void ATTRIBUTE_UNUSED debug_val (struct value *val);
+
+/* Print VAL.  */
+
+void ATTRIBUTE_UNUSED
+debug_val (struct value *val)
+{
+  value_print (val, gdb_stdlog, &user_print_options);
+  gdb_flush (gdb_stdlog);
+}
+
 static void
 val_print_type_code_flags (struct type *type, struct value *original_value,
 			   int embedded_offset, struct ui_file *stream)