[PATCH 2/2] Decode Ada types in Python layer

[Tom Tromey <tromey@adacore.com>]

GNAT emits encoded type names, but these aren't usually of interest to
users.  The Ada language code in gdb hides this oddity -- but the
Python layer does not.  This patch changes the Python code to use the
decoded Ada type name, when appropriate.

I looked at decoding Ada type names during construction, as that would
be cleaner.  However, the Ada support in gdb relies on the encodings
at various points, so this isn't really doable right now.

gdb/ChangeLog
2021-06-17  Tom Tromey  <tromey@adacore.com>

	* python/py-type.c (typy_get_name): Decode an Ada type name.

gdb/testsuite/ChangeLog
2021-06-17  Tom Tromey  <tromey@adacore.com>

	* gdb.ada/py_range.exp: Add type name test cases.
---
 gdb/ChangeLog                      | 4 ++++
 gdb/python/py-type.c               | 9 +++++++++
 gdb/testsuite/ChangeLog            | 4 ++++
 gdb/testsuite/gdb.ada/py_range.exp | 5 +++++
 4 files changed, 22 insertions(+)

diff --git a/gdb/python/py-type.c b/gdb/python/py-type.c
index 4f5f42529c2..04d1c7a0ee7 100644
--- a/gdb/python/py-type.c
+++ b/gdb/python/py-type.c
@@ -27,6 +27,7 @@
 #include "objfiles.h"
 #include "language.h"
 #include "typeprint.h"
+#include "ada-lang.h"
 
 struct type_object
 {
@@ -393,6 +394,14 @@ typy_get_name (PyObject *self, void *closure)
 
   if (type->name () == NULL)
     Py_RETURN_NONE;
+  /* Ada type names are encoded, but it is better for users to see the
+     decoded form.  */
+  if (ADA_TYPE_P (type))
+    {
+      std::string name = ada_decode (type->name (), false);
+      if (!name.empty ())
+	return PyString_FromString (name.c_str ());
+    }
   return PyString_FromString (type->name ());
 }
 
diff --git a/gdb/testsuite/gdb.ada/py_range.exp b/gdb/testsuite/gdb.ada/py_range.exp
index 1a619b70ef7..3e6efa3e932 100644
--- a/gdb/testsuite/gdb.ada/py_range.exp
+++ b/gdb/testsuite/gdb.ada/py_range.exp
@@ -40,3 +40,8 @@ gdb_test "python print(int(gdb.parse_and_eval('si')))" \
 
 gdb_test "python print(int(gdb.parse_and_eval('ir')))" \
          "974"
+
+gdb_test "python print(gdb.parse_and_eval('si').type)" \
+    "foo\\.small_integer" "print type"
+gdb_test "python print(gdb.parse_and_eval('si').type.name)" \
+    "foo\\.small_integer" "print type name"
-- 
2.26.3