[PATCH v2 18/36] Guile extension language: scm-arch.c

[Doug Evans <xdje42 at gmail dot com>]

This patch adds the interface to gdbarch.

2014-01-20  Doug Evans  <xdje42@gmail.com>

	* guile/scm-arch.c: New file.

	testsuite/
	* gdb.guile/scm-arch.c: New file.
	* gdb.guile/scm-arch.exp: New file.

diff --git a/gdb/guile/scm-arch.c b/gdb/guile/scm-arch.c
new file mode 100644
index 0000000..fa578f3
--- /dev/null
+++ b/gdb/guile/scm-arch.c
@@ -0,0 +1,668 @@
+/* Scheme interface to architecture.
+
+   Copyright (C) 2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* See README file in this directory for implementation notes, coding
+   conventions, et.al.  */
+
+#include "defs.h"
+#include "charset.h"
+#include "gdbarch.h"
+#include "arch-utils.h"
+#include "guile-internal.h"
+
+/* The <gdb:arch> smob.
+   The typedef for this struct is in guile-internal.h.  */
+
+struct _arch_smob
+{
+  /* This always appears first.  */
+  gdb_smob base;
+
+  struct gdbarch *gdbarch;
+};
+
+static const char arch_smob_name[] = "gdb:arch";
+
+/* The tag Guile knows the arch smob by.  */
+static scm_t_bits arch_smob_tag;
+
+static struct gdbarch_data *arch_object_data = NULL;
+
+static int arscm_is_arch (SCM);
+
+/* Administrivia for arch smobs.  */
+
+/* The smob "mark" function for <gdb:arch>.  */
+
+static SCM
+arscm_mark_arch_smob (SCM self)
+{
+  arch_smob *a_smob = (arch_smob *) SCM_SMOB_DATA (self);
+
+  /* Do this last.  */
+  return gdbscm_mark_gsmob (&a_smob->base);
+}
+
+/* The smob "print" function for <gdb:arch>.  */
+
+static int
+arscm_print_arch_smob (SCM self, SCM port, scm_print_state *pstate)
+{
+  arch_smob *a_smob = (arch_smob *) SCM_SMOB_DATA (self);
+  struct gdbarch *gdbarch = a_smob->gdbarch;
+
+  gdbscm_printf (port, "#<%s", arch_smob_name);
+  gdbscm_printf (port, " %s", gdbarch_bfd_arch_info (gdbarch)->printable_name);
+  scm_puts (">", port);
+
+  scm_remember_upto_here_1 (self);
+
+  /* Non-zero means success.  */
+  return 1;
+}
+
+/* Low level routine to create a <gdb:arch> object for GDBARCH.  */
+
+static SCM
+arscm_make_arch_smob (struct gdbarch *gdbarch)
+{
+  arch_smob *a_smob = (arch_smob *)
+    scm_gc_malloc (sizeof (arch_smob), arch_smob_name);
+  SCM a_scm;
+
+  a_smob->gdbarch = gdbarch;
+  a_scm = scm_new_smob (arch_smob_tag, (scm_t_bits) a_smob);
+  gdbscm_init_gsmob (&a_smob->base);
+
+  return a_scm;
+}
+
+/* Return the gdbarch field of A_SMOB.  */
+
+struct gdbarch *
+arscm_get_gdbarch (arch_smob *a_smob)
+{
+  return a_smob->gdbarch;
+}
+
+/* Return non-zero if SCM is an architecture smob.  */
+
+static int
+arscm_is_arch (SCM scm)
+{
+  return SCM_SMOB_PREDICATE (arch_smob_tag, scm);
+}
+
+/* (arch? object) -> boolean */
+
+static SCM
+gdbscm_arch_p (SCM scm)
+{
+  return scm_from_bool (arscm_is_arch (scm));
+}
+
+/* Associates an arch_object with GDBARCH as gdbarch_data via the gdbarch
+   post init registration mechanism (gdbarch_data_register_post_init).  */
+
+static void *
+arscm_object_data_init (struct gdbarch *gdbarch)
+{
+  SCM arch_scm = arscm_make_arch_smob (gdbarch);
+
+  /* This object lasts the duration of the GDB session, so there is no
+     call to scm_gc_unprotect_object for it.  */
+  scm_gc_protect_object (arch_scm);
+
+  return (void *) arch_scm;
+}
+
+/* Return the <gdb:arch> object corresponding to GDBARCH.
+   The object is cached in GDBARCH so this is simple.  */
+
+SCM
+arscm_scm_from_arch (struct gdbarch *gdbarch)
+{
+  SCM a_scm = (SCM) gdbarch_data (gdbarch, arch_object_data);
+
+  return a_scm;
+}
+
+/* Return the <gdb:arch> smob in SELF.
+   Throws an exception if SELF is not a <gdb:arch> object.  */
+
+static SCM
+arscm_get_arch_arg_unsafe (SCM self, int arg_pos, const char *func_name)
+{
+  SCM_ASSERT_TYPE (arscm_is_arch (self), self, arg_pos, func_name,
+		   arch_smob_name);
+
+  return self;
+}
+
+/* Return a pointer to the arch smob of SELF.
+   Throws an exception if SELF is not a <gdb:arch> object.  */
+
+arch_smob *
+arscm_get_arch_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name)
+{
+  SCM a_scm = arscm_get_arch_arg_unsafe (self, arg_pos, func_name);
+  arch_smob *a_smob = (arch_smob *) SCM_SMOB_DATA (a_scm);
+
+  return a_smob;
+}
+
+/* Arch methods.  */
+
+/* (current-arch) -> <gdb:arch>
+   Return the architecture of the currently selected stack frame,
+   if there is one, or the current target if there isn't.  */
+
+static SCM
+gdbscm_current_arch (void)
+{
+  return arscm_scm_from_arch (get_current_arch ());
+}
+
+/* (arch-name <gdb:arch>) -> string
+   Return the name of the architecture as a string value.  */
+
+static SCM
+gdbscm_arch_name (SCM self)
+{
+  arch_smob *a_smob
+    = arscm_get_arch_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
+  struct gdbarch *gdbarch = a_smob->gdbarch;
+  const char *name;
+
+  name = (gdbarch_bfd_arch_info (gdbarch))->printable_name;
+
+  return gdbscm_scm_from_c_string (name);
+}
+
+/* (arch-charset <gdb:arch>) -> string */
+
+static SCM
+gdbscm_arch_charset (SCM self)
+{
+  arch_smob *a_smob
+    =arscm_get_arch_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
+  struct gdbarch *gdbarch = a_smob->gdbarch;
+
+  return gdbscm_scm_from_c_string (target_charset (gdbarch));
+}
+
+/* (arch-wide-charset <gdb:arch>) -> string */
+
+static SCM
+gdbscm_arch_wide_charset (SCM self)
+{
+  arch_smob *a_smob
+    = arscm_get_arch_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
+  struct gdbarch *gdbarch = a_smob->gdbarch;
+
+  return gdbscm_scm_from_c_string (target_wide_charset (gdbarch));
+}
+
+/* Builtin types.
+
+   The order the types are defined here follows the order in
+   struct builtin_type.  */
+
+/* Helper routine to return a builtin type for <gdb:arch> object SELF.
+   OFFSET is offsetof (builtin_type, the_type).
+   Throws an exception if SELF is not a <gdb:arch> object.  */
+
+static const struct builtin_type *
+gdbscm_arch_builtin_type (SCM self, const char *func_name)
+{
+  arch_smob *a_smob
+    = arscm_get_arch_smob_arg_unsafe (self, SCM_ARG1, func_name);
+  struct gdbarch *gdbarch = a_smob->gdbarch;
+
+  return builtin_type (gdbarch);
+}
+
+/* (arch-void-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_void_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_void;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-char-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_char_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_char;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-short-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_short_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_short;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-int-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_int_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_int;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-long-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_long_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_long;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-schar-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_schar_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_signed_char;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-uchar-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_uchar_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_unsigned_char;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-ushort-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_ushort_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_unsigned_short;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-uint-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_uint_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_unsigned_int;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-ulong-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_ulong_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_unsigned_long;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-float-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_float_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_float;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-double-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_double_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_double;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-longdouble-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_longdouble_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_long_double;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-bool-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_bool_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_bool;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-longlong-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_longlong_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_long_long;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-ulonglong-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_ulonglong_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_unsigned_long_long;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-int8-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_int8_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_int8;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-uint8-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_uint8_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_uint8;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-int16-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_int16_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_int16;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-uint16-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_uint16_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_uint16;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-int32-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_int32_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_int32;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-uint32-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_uint32_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_uint32;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-int64-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_int64_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_int64;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* (arch-uint64-type <gdb:arch>) -> <gdb:type> */
+
+static SCM
+gdbscm_arch_uint64_type (SCM self)
+{
+  struct type *type
+    = gdbscm_arch_builtin_type (self, FUNC_NAME)->builtin_uint64;
+
+  return tyscm_scm_from_type (type);
+}
+
+/* Initialize the Scheme architecture support.  */
+
+static const scheme_function arch_functions[] =
+{
+  { "arch?", 1, 0, 0, gdbscm_arch_p,
+    "\
+Return #t if the object is a <gdb:arch> object." },
+
+  { "current-arch", 0, 0, 0, gdbscm_current_arch,
+    "\
+Return the <gdb:arch> object representing the architecture of the\n\
+currently selected stack frame, if there is one, or the architecture of the\n\
+current target if there isn't.\n\
+\n\
+  Arguments: none" },
+
+  { "arch-name", 1, 0, 0, gdbscm_arch_name,
+    "\
+Return the name of the architecture." },
+
+  { "arch-charset", 1, 0, 0, gdbscm_arch_charset,
+  "\
+Return name of target character set as a string." },
+
+  { "arch-wide-charset", 1, 0, 0, gdbscm_arch_wide_charset,
+  "\
+Return name of target wide character set as a string." },
+
+  { "arch-void-type", 1, 0, 0, gdbscm_arch_void_type,
+    "\
+Return the <gdb:type> object for the \"void\" type\n\
+of the architecture." },
+
+  { "arch-char-type", 1, 0, 0, gdbscm_arch_char_type,
+    "\
+Return the <gdb:type> object for the \"char\" type\n\
+of the architecture." },
+
+  { "arch-short-type", 1, 0, 0, gdbscm_arch_short_type,
+    "\
+Return the <gdb:type> object for the \"short\" type\n\
+of the architecture." },
+
+  { "arch-int-type", 1, 0, 0, gdbscm_arch_int_type,
+    "\
+Return the <gdb:type> object for the \"int\" type\n\
+of the architecture." },
+
+  { "arch-long-type", 1, 0, 0, gdbscm_arch_long_type,
+    "\
+Return the <gdb:type> object for the \"long\" type\n\
+of the architecture." },
+
+  { "arch-schar-type", 1, 0, 0, gdbscm_arch_schar_type,
+    "\
+Return the <gdb:type> object for the \"signed char\" type\n\
+of the architecture." },
+
+  { "arch-uchar-type", 1, 0, 0, gdbscm_arch_uchar_type,
+    "\
+Return the <gdb:type> object for the \"unsigned char\" type\n\
+of the architecture." },
+
+  { "arch-ushort-type", 1, 0, 0, gdbscm_arch_ushort_type,
+    "\
+Return the <gdb:type> object for the \"unsigned short\" type\n\
+of the architecture." },
+
+  { "arch-uint-type", 1, 0, 0, gdbscm_arch_uint_type,
+    "\
+Return the <gdb:type> object for the \"unsigned int\" type\n\
+of the architecture." },
+
+  { "arch-ulong-type", 1, 0, 0, gdbscm_arch_ulong_type,
+    "\
+Return the <gdb:type> object for the \"unsigned long\" type\n\
+of the architecture." },
+
+  { "arch-float-type", 1, 0, 0, gdbscm_arch_float_type,
+    "\
+Return the <gdb:type> object for the \"float\" type\n\
+of the architecture." },
+
+  { "arch-double-type", 1, 0, 0, gdbscm_arch_double_type,
+    "\
+Return the <gdb:type> object for the \"double\" type\n\
+of the architecture." },
+
+  { "arch-longdouble-type", 1, 0, 0, gdbscm_arch_longdouble_type,
+    "\
+Return the <gdb:type> object for the \"long double\" type\n\
+of the architecture." },
+
+  { "arch-bool-type", 1, 0, 0, gdbscm_arch_bool_type,
+    "\
+Return the <gdb:type> object for the \"bool\" type\n\
+of the architecture." },
+
+  { "arch-longlong-type", 1, 0, 0, gdbscm_arch_longlong_type,
+    "\
+Return the <gdb:type> object for the \"long long\" type\n\
+of the architecture." },
+
+  { "arch-ulonglong-type", 1, 0, 0,
+    gdbscm_arch_ulonglong_type,
+    "\
+Return the <gdb:type> object for the \"unsigned long long\" type\n\
+of the architecture." },
+
+  { "arch-int8-type", 1, 0, 0, gdbscm_arch_int8_type,
+    "\
+Return the <gdb:type> object for the \"int8\" type\n\
+of the architecture." },
+
+  { "arch-uint8-type", 1, 0, 0, gdbscm_arch_uint8_type,
+    "\
+Return the <gdb:type> object for the \"uint8\" type\n\
+of the architecture." },
+
+  { "arch-int16-type", 1, 0, 0, gdbscm_arch_int16_type,
+    "\
+Return the <gdb:type> object for the \"int16\" type\n\
+of the architecture." },
+
+  { "arch-uint16-type", 1, 0, 0, gdbscm_arch_uint16_type,
+    "\
+Return the <gdb:type> object for the \"uint16\" type\n\
+of the architecture." },
+
+  { "arch-int32-type", 1, 0, 0, gdbscm_arch_int32_type,
+    "\
+Return the <gdb:type> object for the \"int32\" type\n\
+of the architecture." },
+
+  { "arch-uint32-type", 1, 0, 0, gdbscm_arch_uint32_type,
+    "\
+Return the <gdb:type> object for the \"uint32\" type\n\
+of the architecture." },
+
+  { "arch-int64-type", 1, 0, 0, gdbscm_arch_int64_type,
+    "\
+Return the <gdb:type> object for the \"int64\" type\n\
+of the architecture." },
+
+  { "arch-uint64-type", 1, 0, 0, gdbscm_arch_uint64_type,
+    "\
+Return the <gdb:type> object for the \"uint64\" type\n\
+of the architecture." },
+
+  END_FUNCTIONS
+};
+
+void
+gdbscm_initialize_arches (void)
+{
+  arch_smob_tag = gdbscm_make_smob_type (arch_smob_name, sizeof (arch_smob));
+  scm_set_smob_mark (arch_smob_tag, arscm_mark_arch_smob);
+  scm_set_smob_print (arch_smob_tag, arscm_print_arch_smob);
+
+  gdbscm_define_functions (arch_functions, 1);
+
+  arch_object_data
+    = gdbarch_data_register_post_init (arscm_object_data_init);
+}
diff --git a/gdb/testsuite/gdb.guile/scm-arch.c b/gdb/testsuite/gdb.guile/scm-arch.c
new file mode 100644
index 0000000..6c0ef92
--- /dev/null
+++ b/gdb/testsuite/gdb.guile/scm-arch.c
@@ -0,0 +1,22 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2014 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see  <http://www.gnu.org/licenses/>.  */
+
+int
+main (void)
+{
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.guile/scm-arch.exp b/gdb/testsuite/gdb.guile/scm-arch.exp
new file mode 100644
index 0000000..1fcf615
--- /dev/null
+++ b/gdb/testsuite/gdb.guile/scm-arch.exp
@@ -0,0 +1,33 @@
+# Copyright 2014 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+load_lib gdb-guile.exp
+
+standard_testfile
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
+    return
+}
+
+# Skip all tests if Guile scripting is not enabled.
+if { [skip_guile_tests] } { continue }
+
+if ![gdb_guile_runto_main] {
+   return
+}
+
+gdb_scm_test_silent_cmd "guile (define frame (selected-frame))" "get frame"
+gdb_scm_test_silent_cmd "guile (define arch (frame-arch frame))" "get arch"
+gdb_scm_test_silent_cmd "guile (define pc (frame-pc frame))" "get pc"