[PATCH 1/2] [python] Add gdb.value_history_count()

["Matt McCormick (thewtex)" <matthew.m.mccormick@gmail.com>]

From: Matt McCormick (thewtex) <matt@mmmccormick.com>

An example use cause is trying to log related data with a pretty-printer.  For
example, save a file with the same name as the current history number.
---
 gdb/python/py-value.c        |    7 +++++++
 gdb/python/python-internal.h |    1 +
 gdb/python/python.c          |    5 +++++
 gdb/value.c                  |    6 ++++++
 gdb/value.h                  |    4 ++++
 5 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/gdb/python/py-value.c b/gdb/python/py-value.c
index 14efd79..17c1aee 100644
--- a/gdb/python/py-value.c
+++ b/gdb/python/py-value.c
@@ -403,6 +403,13 @@ valpy_get_is_optimized_out (PyObject *self, void *closure)
   Py_RETURN_FALSE;
 }
 
+/* implementation of gdb.value_history_count. */ 
+PyObject *
+gdbpy_value_history_count (PyObject *self, PyObject *args)
+{
+  return Py_BuildValue("i", get_value_history_count());
+}
+
 enum valpy_opcode
 {
   VALPY_ADD,
diff --git a/gdb/python/python-internal.h b/gdb/python/python-internal.h
index 47662d9..8056ba8 100644
--- a/gdb/python/python-internal.h
+++ b/gdb/python/python-internal.h
@@ -93,6 +93,7 @@ PyObject *gdbpy_lookup_symbol (PyObject *self, PyObject *args, PyObject *kw);
 PyObject *gdbpy_selected_frame (PyObject *self, PyObject *args);
 PyObject *gdbpy_block_for_pc (PyObject *self, PyObject *args);
 PyObject *gdbpy_lookup_type (PyObject *self, PyObject *args, PyObject *kw);
+PyObject *gdbpy_value_history_count (PyObject *self, PyObject* args);
 PyObject *gdbpy_inferiors (PyObject *unused, PyObject *unused2);
 PyObject *gdbpy_selected_thread (PyObject *self, PyObject *args);
 
diff --git a/gdb/python/python.c b/gdb/python/python.c
index 707b700..debf189 100644
--- a/gdb/python/python.c
+++ b/gdb/python/python.c
@@ -1007,6 +1007,11 @@ Return a string explaining unwind stop reason." },
     "lookup_type (name [, block]) -> type\n\
 Return a Type corresponding to the given name." },
 
+  { "value_history_count", (PyCFunction) gdbpy_value_history_count,
+    METH_VARARGS,
+    "value_history_count () -> int.\n\
+Return an int corresponding to the number of entries in the value history." },
+
   { "lookup_symbol", (PyCFunction) gdbpy_lookup_symbol,
     METH_VARARGS | METH_KEYWORDS,
     "lookup_symbol (name [, block] [, domain]) -> (symbol, is_field_of_this)\n\
diff --git a/gdb/value.c b/gdb/value.c
index 2f31185..a9e8ec3 100644
--- a/gdb/value.c
+++ b/gdb/value.c
@@ -343,6 +343,12 @@ allocate_computed_value (struct type *type,
 
 /* Accessor methods.  */
 
+int
+get_value_history_count()
+{
+  return value_history_count;
+}
+
 struct value *
 value_next (struct value *value)
 {
diff --git a/gdb/value.h b/gdb/value.h
index 0da7031..cfe6618 100644
--- a/gdb/value.h
+++ b/gdb/value.h
@@ -48,6 +48,10 @@ struct value;
 
 struct value *value_next (struct value *);
 
+/* Abs number of last entry stored */
+
+int get_value_history_count();
+
 /* Type of the value.  */
 
 extern struct type *value_type (struct value *);
-- 
1.6.5.5