Checking in this patch for Thiago: Rename python-* files into py-*,

more 8+3 friendly.


gdb/
        * Makefile.in (py-cmd.o): Renamed from python-cmd.o.  Updated
        references.
        (py-frame.o): Renamed from python-frame.o.  Updated references.
        (py-function.o): Renamed from python-function.o.  Updated references.
        (py-objfile.o): Renamed from python-objfile.o.  Updated references.
        (py-prettyprint.o): Renamed from python-prettyprint.o.  Updated
+references.
        (py-type.o): Renamed from python-type.o.  Updated references.
        (py-utils.o): Renamed from python-utils.o.  Updated references.
        (py-value.o): Renamed from python-value.o.  Updated references.
        * py-cmd.o: Renamed from python-cmd.o.
        * py-frame.o: Renamed from python-frame.o.
        * py-function.o: Renamed from python-function.o.
        * py-objfile.o: Renamed from python-objfile.o.
        * py-prettyprint.o: Renamed from python-prettyprint.o.
        * py-type.o: Renamed from python-type.o.
        * py-utils.o: Renamed from python-utils.o.
        * py-value.o: Renamed from python-value.o.

gdb/testsuite/
        * gdb.python/Makefile.in (EXECUTABLES): Adjust to new executable
        names, add missing ones.
        * gdb.python/py-cmd.exp: Rename from python-cmd.exp.
        * gdb.python/py-frame.c: Rename from python-frame.c.
        * gdb.python/py-frame.exp: Rename from python-frame.exp.  Adjust
        testfile name.
        * gdb.python/py-function.exp: Rename from python-function.exp.
        * gdb.python/py-mi.exp: Rename from python-mi.exp.  Adjust
        testfile name.
        * gdb.python/py-prettyprint.c: Rename from python-prettyprint.c.
        * gdb.python/py-prettyprint.exp: Rename from python-prettyprint.exp.
        Adjust testfile name.
        * gdb.python/py-prettyprint.py: Rename from python-prettyprint.py.
        * gdb.python/py-template.cc: Rename from python-template.cc.
        * gdb.python/py-template.exp: Rename from python-template.exp.
        Adjust testfile name.
        * gdb.python/py-value.c: Rename from python-value.c.
        * gdb.python/py-value.exp: Rename from python-value.exp.  Adjust
        testfile name.

1 files changed, 1068 insertions, 0 deletions

diff --git a/gdb/python/py-value.c b/gdb/python/py-value.c
new file mode 100644
index 0000000..3d88aa3
--- /dev/null
+++ b/gdb/python/py-value.c
@@ -0,0 +1,1068 @@
+/* Python interface to values.
+
+   Copyright (C) 2008, 2009 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/>.  */
+
+#include "defs.h"
+#include "gdb_assert.h"
+#include "charset.h"
+#include "value.h"
+#include "exceptions.h"
+#include "language.h"
+#include "dfp.h"
+#include "valprint.h"
+
+#ifdef HAVE_PYTHON
+
+#include "python-internal.h"
+
+/* Even though Python scalar types directly map to host types, we use
+   target types here to remain consistent with the the values system in
+   GDB (which uses target arithmetic).  */
+
+/* Python's integer type corresponds to C's long type.  */
+#define builtin_type_pyint builtin_type (python_gdbarch)->builtin_long
+
+/* Python's float type corresponds to C's double type.  */
+#define builtin_type_pyfloat builtin_type (python_gdbarch)->builtin_double
+
+/* Python's long type corresponds to C's long long type.  */
+#define builtin_type_pylong builtin_type (python_gdbarch)->builtin_long_long
+
+#define builtin_type_pybool \
+  language_bool_type (python_language, python_gdbarch)
+
+#define builtin_type_pychar \
+  language_string_char_type (python_language, python_gdbarch)
+
+typedef struct value_object {
+  PyObject_HEAD
+  struct value_object *next;
+  struct value_object *prev;
+  struct value *value;
+  PyObject *address;
+  PyObject *type;
+} value_object;
+
+/* List of all values which are currently exposed to Python. It is
+   maintained so that when an objfile is discarded, preserve_values
+   can copy the values' types if needed.  */
+/* This variable is unnecessarily initialized to NULL in order to
+   work around a linker bug on MacOS.  */
+static value_object *values_in_python = NULL;
+
+/* Called by the Python interpreter when deallocating a value object.  */
+static void
+valpy_dealloc (PyObject *obj)
+{
+  value_object *self = (value_object *) obj;
+
+  /* Remove SELF from the global list.  */
+  if (self->prev)
+    self->prev->next = self->next;
+  else
+    {
+      gdb_assert (values_in_python == self);
+      values_in_python = self->next;
+    }
+  if (self->next)
+    self->next->prev = self->prev;
+
+  value_free (self->value);
+
+  if (self->address)
+    /* Use braces to appease gcc warning.  *sigh*  */
+    {
+      Py_DECREF (self->address);
+    }
+
+  if (self->type)
+    {
+      Py_DECREF (self->type);
+    }
+
+  self->ob_type->tp_free (self);
+}
+
+/* Helper to push a Value object on the global list.  */
+static void
+note_value (value_object *value_obj)
+{
+  value_obj->next = values_in_python;
+  if (value_obj->next)
+    value_obj->next->prev = value_obj;
+  value_obj->prev = NULL;
+  values_in_python = value_obj;
+}
+
+/* Called when a new gdb.Value object needs to be allocated.  */
+static PyObject *
+valpy_new (PyTypeObject *subtype, PyObject *args, PyObject *keywords)
+{
+  struct value *value = NULL;   /* Initialize to appease gcc warning.  */
+  value_object *value_obj;
+
+  if (PyTuple_Size (args) != 1)
+    {
+      PyErr_SetString (PyExc_TypeError, _("Value object creation takes only "
+					  "1 argument"));
+      return NULL;
+    }
+
+  value_obj = (value_object *) subtype->tp_alloc (subtype, 1);
+  if (value_obj == NULL)
+    {
+      PyErr_SetString (PyExc_MemoryError, _("Could not allocate memory to "
+					    "create Value object."));
+      return NULL;
+    }
+
+  value = convert_value_from_python (PyTuple_GetItem (args, 0));
+  if (value == NULL)
+    {
+      subtype->tp_free (value_obj);
+      return NULL;
+    }
+
+  value_obj->value = value;
+  value_incref (value);
+  value_obj->address = NULL;
+  value_obj->type = NULL;
+  note_value (value_obj);
+
+  return (PyObject *) value_obj;
+}
+
+/* Iterate over all the Value objects, calling preserve_one_value on
+   each.  */
+void
+preserve_python_values (struct objfile *objfile, htab_t copied_types)
+{
+  value_object *iter;
+
+  for (iter = values_in_python; iter; iter = iter->next)
+    preserve_one_value (iter->value, objfile, copied_types);
+}
+
+/* Given a value of a pointer type, apply the C unary * operator to it.  */
+static PyObject *
+valpy_dereference (PyObject *self, PyObject *args)
+{
+  struct value *res_val = NULL;	  /* Initialize to appease gcc warning.  */
+  volatile struct gdb_exception except;
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      res_val = value_ind (((value_object *) self)->value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return value_to_value_object (res_val);
+}
+
+/* Return "&value".  */
+static PyObject *
+valpy_get_address (PyObject *self, void *closure)
+{
+  struct value *res_val = NULL;	  /* Initialize to appease gcc warning.  */
+  value_object *val_obj = (value_object *) self;
+  volatile struct gdb_exception except;
+
+  if (!val_obj->address)
+    {
+      TRY_CATCH (except, RETURN_MASK_ALL)
+	{
+	  res_val = value_addr (val_obj->value);
+	}
+      if (except.reason < 0)
+	{
+	  val_obj->address = Py_None;
+	  Py_INCREF (Py_None);
+	}
+      else
+	val_obj->address = value_to_value_object (res_val);
+    }
+
+  Py_INCREF (val_obj->address);
+
+  return val_obj->address;
+}
+
+/* Return type of the value.  */
+static PyObject *
+valpy_get_type (PyObject *self, void *closure)
+{
+  value_object *obj = (value_object *) self;
+  if (!obj->type)
+    {
+      obj->type = type_to_type_object (value_type (obj->value));
+      if (!obj->type)
+	{
+	  obj->type = Py_None;
+	  Py_INCREF (obj->type);
+	}
+    }
+  Py_INCREF (obj->type);
+  return obj->type;
+}
+
+/* Implementation of gdb.Value.string ([encoding] [, errors]
+   [, length]) -> string.  Return Unicode string with value contents.
+   If ENCODING is not given, the string is assumed to be encoded in
+   the target's charset.  If LENGTH is provided, only fetch string to
+   the length provided.  */
+
+static PyObject *
+valpy_string (PyObject *self, PyObject *args, PyObject *kw)
+{
+  int length = -1, ret = 0;
+  gdb_byte *buffer;
+  struct value *value = ((value_object *) self)->value;
+  volatile struct gdb_exception except;
+  PyObject *unicode;
+  const char *encoding = NULL;
+  const char *errors = NULL;
+  const char *user_encoding = NULL;
+  const char *la_encoding = NULL;
+  static char *keywords[] = { "encoding", "errors", "length" };
+
+  if (!PyArg_ParseTupleAndKeywords (args, kw, "|ssi", keywords,
+				    &user_encoding, &errors, &length))
+    return NULL;
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      LA_GET_STRING (value, &buffer, &length, &la_encoding);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  encoding = (user_encoding && *user_encoding) ? user_encoding : la_encoding;
+  unicode = PyUnicode_Decode (buffer, length, encoding, errors);
+  xfree (buffer);
+
+  return unicode;
+}
+
+/* Cast a value to a given type.  */
+static PyObject *
+valpy_cast (PyObject *self, PyObject *args)
+{
+  PyObject *type_obj;
+  struct type *type;
+  struct value *res_val = NULL;	  /* Initialize to appease gcc warning.  */
+  volatile struct gdb_exception except;
+
+  if (! PyArg_ParseTuple (args, "O", &type_obj))
+    return NULL;
+
+  type = type_object_to_type (type_obj);
+  if (! type)
+    {
+      PyErr_SetString (PyExc_RuntimeError, "argument must be a Type");
+      return NULL;
+    }
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      res_val = value_cast (type, ((value_object *) self)->value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return value_to_value_object (res_val);
+}
+
+static Py_ssize_t
+valpy_length (PyObject *self)
+{
+  /* We don't support getting the number of elements in a struct / class.  */
+  PyErr_SetString (PyExc_NotImplementedError,
+		   "Invalid operation on gdb.Value.");
+  return -1;
+}
+
+/* Given string name of an element inside structure, return its value
+   object.  */
+static PyObject *
+valpy_getitem (PyObject *self, PyObject *key)
+{
+  value_object *self_value = (value_object *) self;
+  char *field = NULL;
+  struct value *res_val = NULL;
+  volatile struct gdb_exception except;
+
+  if (gdbpy_is_string (key))
+    {  
+      field = python_string_to_host_string (key);
+      if (field == NULL)
+	return NULL;
+    }
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      struct value *tmp = self_value->value;
+
+      if (field)
+	res_val = value_struct_elt (&tmp, NULL, field, 0, NULL);
+      else
+	{
+	  /* Assume we are attempting an array access, and let the
+	     value code throw an exception if the index has an invalid
+	     type.  */
+	  struct value *idx = convert_value_from_python (key);
+	  if (idx != NULL)
+	    res_val = value_subscript (tmp, value_as_long (idx));
+	}
+    }
+
+  xfree (field);
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return res_val ? value_to_value_object (res_val) : NULL;
+}
+
+static int
+valpy_setitem (PyObject *self, PyObject *key, PyObject *value)
+{
+  PyErr_Format (PyExc_NotImplementedError,
+		_("Setting of struct elements is not currently supported."));
+  return -1;
+}
+
+/* Called by the Python interpreter to obtain string representation
+   of the object.  */
+static PyObject *
+valpy_str (PyObject *self)
+{
+  char *s = NULL;
+  struct ui_file *stb;
+  struct cleanup *old_chain;
+  PyObject *result;
+  struct value_print_options opts;
+  volatile struct gdb_exception except;
+
+  get_user_print_options (&opts);
+  opts.deref_ref = 0;
+
+  stb = mem_fileopen ();
+  old_chain = make_cleanup_ui_file_delete (stb);
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      common_val_print (((value_object *) self)->value, stb, 0,
+			&opts, python_language);
+      s = ui_file_xstrdup (stb, NULL);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  do_cleanups (old_chain);
+
+  result = PyUnicode_Decode (s, strlen (s), host_charset (), NULL);
+  xfree (s);
+
+  return result;
+}
+
+/* Implements gdb.Value.is_optimized_out.  */
+static PyObject *
+valpy_get_is_optimized_out (PyObject *self, void *closure)
+{
+  struct value *value = ((value_object *) self)->value;
+
+  if (value_optimized_out (value))
+    Py_RETURN_TRUE;
+
+  Py_RETURN_FALSE;
+}
+
+enum valpy_opcode
+{
+  VALPY_ADD,
+  VALPY_SUB,
+  VALPY_MUL,
+  VALPY_DIV,
+  VALPY_REM,
+  VALPY_POW,
+  VALPY_LSH,
+  VALPY_RSH,
+  VALPY_BITAND,
+  VALPY_BITOR,
+  VALPY_BITXOR
+};
+
+/* If TYPE is a reference, return the target; otherwise return TYPE.  */
+#define STRIP_REFERENCE(TYPE) \
+  ((TYPE_CODE (TYPE) == TYPE_CODE_REF) ? (TYPE_TARGET_TYPE (TYPE)) : (TYPE))
+
+/* Returns a value object which is the result of applying the operation
+   specified by OPCODE to the given arguments.  */
+static PyObject *
+valpy_binop (enum valpy_opcode opcode, PyObject *self, PyObject *other)
+{
+  struct value *res_val = NULL;	  /* Initialize to appease gcc warning.  */
+  volatile struct gdb_exception except;
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      struct value *arg1, *arg2;
+
+      /* If the gdb.Value object is the second operand, then it will be passed
+	 to us as the OTHER argument, and SELF will be an entirely different
+	 kind of object, altogether.  Because of this, we can't assume self is
+	 a gdb.Value object and need to convert it from python as well.  */
+      arg1 = convert_value_from_python (self);
+      if (arg1 == NULL)
+	break;
+
+      arg2 = convert_value_from_python (other);
+      if (arg2 == NULL)
+	break;
+
+      switch (opcode)
+	{
+	case VALPY_ADD:
+	  {
+	    struct type *ltype = value_type (arg1);
+	    struct type *rtype = value_type (arg2);
+
+	    CHECK_TYPEDEF (ltype);
+	    ltype = STRIP_REFERENCE (ltype);
+	    CHECK_TYPEDEF (rtype);
+	    rtype = STRIP_REFERENCE (rtype);
+
+	    if (TYPE_CODE (ltype) == TYPE_CODE_PTR
+		&& is_integral_type (rtype))
+	      res_val = value_ptradd (arg1, value_as_long (arg2));
+	    else if (TYPE_CODE (rtype) == TYPE_CODE_PTR
+		     && is_integral_type (ltype))
+	      res_val = value_ptradd (arg2, value_as_long (arg1));
+	    else
+	      res_val = value_binop (arg1, arg2, BINOP_ADD);
+	  }
+	  break;
+	case VALPY_SUB:
+	  {
+	    struct type *ltype = value_type (arg1);
+	    struct type *rtype = value_type (arg2);
+
+	    CHECK_TYPEDEF (ltype);
+	    ltype = STRIP_REFERENCE (ltype);
+	    CHECK_TYPEDEF (rtype);
+	    rtype = STRIP_REFERENCE (rtype);
+
+	    if (TYPE_CODE (ltype) == TYPE_CODE_PTR
+		&& TYPE_CODE (rtype) == TYPE_CODE_PTR)
+	      /* A ptrdiff_t for the target would be preferable here.  */
+	      res_val = value_from_longest (builtin_type_pyint,
+					    value_ptrdiff (arg1, arg2));
+	    else if (TYPE_CODE (ltype) == TYPE_CODE_PTR
+		     && is_integral_type (rtype))
+	      res_val = value_ptradd (arg1, - value_as_long (arg2));
+	    else
+	      res_val = value_binop (arg1, arg2, BINOP_SUB);
+	  }
+	  break;
+	case VALPY_MUL:
+	  res_val = value_binop (arg1, arg2, BINOP_MUL);
+	  break;
+	case VALPY_DIV:
+	  res_val = value_binop (arg1, arg2, BINOP_DIV);
+	  break;
+	case VALPY_REM:
+	  res_val = value_binop (arg1, arg2, BINOP_REM);
+	  break;
+	case VALPY_POW:
+	  res_val = value_binop (arg1, arg2, BINOP_EXP);
+	  break;
+	case VALPY_LSH:
+	  res_val = value_binop (arg1, arg2, BINOP_LSH);
+	  break;
+	case VALPY_RSH:
+	  res_val = value_binop (arg1, arg2, BINOP_RSH);
+	  break;
+	case VALPY_BITAND:
+	  res_val = value_binop (arg1, arg2, BINOP_BITWISE_AND);
+	  break;
+	case VALPY_BITOR:
+	  res_val = value_binop (arg1, arg2, BINOP_BITWISE_IOR);
+	  break;
+	case VALPY_BITXOR:
+	  res_val = value_binop (arg1, arg2, BINOP_BITWISE_XOR);
+	  break;
+	}
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return res_val ? value_to_value_object (res_val) : NULL;
+}
+
+static PyObject *
+valpy_add (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_ADD, self, other);
+}
+
+static PyObject *
+valpy_subtract (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_SUB, self, other);
+}
+
+static PyObject *
+valpy_multiply (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_MUL, self, other);
+}
+
+static PyObject *
+valpy_divide (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_DIV, self, other);
+}
+
+static PyObject *
+valpy_remainder (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_REM, self, other);
+}
+
+static PyObject *
+valpy_power (PyObject *self, PyObject *other, PyObject *unused)
+{
+  /* We don't support the ternary form of pow.  I don't know how to express
+     that, so let's just throw NotImplementedError to at least do something
+     about it.  */
+  if (unused != Py_None)
+    {
+      PyErr_SetString (PyExc_NotImplementedError,
+		       "Invalid operation on gdb.Value.");
+      return NULL;
+    }
+
+  return valpy_binop (VALPY_POW, self, other);
+}
+
+static PyObject *
+valpy_negative (PyObject *self)
+{
+  struct value *val = NULL;
+  volatile struct gdb_exception except;
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      val = value_neg (((value_object *) self)->value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return value_to_value_object (val);
+}
+
+static PyObject *
+valpy_positive (PyObject *self)
+{
+  return value_to_value_object (((value_object *) self)->value);
+}
+
+static PyObject *
+valpy_absolute (PyObject *self)
+{
+  struct value *value = ((value_object *) self)->value;
+  if (value_less (value, value_zero (value_type (value), not_lval)))
+    return valpy_negative (self);
+  else
+    return valpy_positive (self);
+}
+
+/* Implements boolean evaluation of gdb.Value.  */
+static int
+valpy_nonzero (PyObject *self)
+{
+  value_object *self_value = (value_object *) self;
+  struct type *type;
+
+  type = check_typedef (value_type (self_value->value));
+
+  if (is_integral_type (type) || TYPE_CODE (type) == TYPE_CODE_PTR)
+    return !!value_as_long (self_value->value);
+  else if (TYPE_CODE (type) == TYPE_CODE_FLT)
+    return value_as_double (self_value->value) != 0;
+  else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
+    return !decimal_is_zero (value_contents (self_value->value),
+			     TYPE_LENGTH (type),
+			     gdbarch_byte_order (get_type_arch (type)));
+  else
+    {
+      PyErr_SetString (PyExc_TypeError, _("Attempted truth testing on invalid "
+					  "gdb.Value type."));
+      return 0;
+    }
+}
+
+/* Implements ~ for value objects.  */
+static PyObject *
+valpy_invert (PyObject *self)
+{
+  struct value *val = NULL;
+  volatile struct gdb_exception except;
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      val = value_complement (((value_object *) self)->value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return value_to_value_object (val);
+}
+
+/* Implements left shift for value objects.  */
+static PyObject *
+valpy_lsh (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_LSH, self, other);
+}
+
+/* Implements right shift for value objects.  */
+static PyObject *
+valpy_rsh (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_RSH, self, other);
+}
+
+/* Implements bitwise and for value objects.  */
+static PyObject *
+valpy_and (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_BITAND, self, other);
+}
+
+/* Implements bitwise or for value objects.  */
+static PyObject *
+valpy_or (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_BITOR, self, other);
+}
+
+/* Implements bitwise xor for value objects.  */
+static PyObject *
+valpy_xor (PyObject *self, PyObject *other)
+{
+  return valpy_binop (VALPY_BITXOR, self, other);
+}
+
+/* Implements comparison operations for value objects.  */
+static PyObject *
+valpy_richcompare (PyObject *self, PyObject *other, int op)
+{
+  int result = 0;
+  struct value *value_other;
+  volatile struct gdb_exception except;
+
+  if (other == Py_None)
+    /* Comparing with None is special.  From what I can tell, in Python
+       None is smaller than anything else.  */
+    switch (op) {
+      case Py_LT:
+      case Py_LE:
+      case Py_EQ:
+	Py_RETURN_FALSE;
+      case Py_NE:
+      case Py_GT:
+      case Py_GE:
+	Py_RETURN_TRUE;
+      default:
+	/* Can't happen.  */
+	PyErr_SetString (PyExc_NotImplementedError,
+			 "Invalid operation on gdb.Value.");
+	return NULL;
+    }
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      value_other = convert_value_from_python (other);
+      if (value_other == NULL)
+	{
+	  result = -1;
+	  break;
+	}
+
+      switch (op) {
+        case Py_LT:
+	  result = value_less (((value_object *) self)->value, value_other);
+	  break;
+	case Py_LE:
+	  result = value_less (((value_object *) self)->value, value_other)
+	    || value_equal (((value_object *) self)->value, value_other);
+	  break;
+	case Py_EQ:
+	  result = value_equal (((value_object *) self)->value, value_other);
+	  break;
+	case Py_NE:
+	  result = !value_equal (((value_object *) self)->value, value_other);
+	  break;
+        case Py_GT:
+	  result = value_less (value_other, ((value_object *) self)->value);
+	  break;
+	case Py_GE:
+	  result = value_less (value_other, ((value_object *) self)->value)
+	    || value_equal (((value_object *) self)->value, value_other);
+	  break;
+	default:
+	  /* Can't happen.  */
+	  PyErr_SetString (PyExc_NotImplementedError,
+			   "Invalid operation on gdb.Value.");
+	  result = -1;
+	  break;
+      }
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  /* In this case, the Python exception has already been set.  */
+  if (result < 0)
+    return NULL;
+
+  if (result == 1)
+    Py_RETURN_TRUE;
+
+  Py_RETURN_FALSE;
+}
+
+/* Helper function to determine if a type is "int-like".  */
+static int
+is_intlike (struct type *type, int ptr_ok)
+{
+  CHECK_TYPEDEF (type);
+  return (TYPE_CODE (type) == TYPE_CODE_INT
+	  || TYPE_CODE (type) == TYPE_CODE_ENUM
+	  || TYPE_CODE (type) == TYPE_CODE_BOOL
+	  || TYPE_CODE (type) == TYPE_CODE_CHAR
+	  || (ptr_ok && TYPE_CODE (type) == TYPE_CODE_PTR));
+}
+
+/* Implements conversion to int.  */
+static PyObject *
+valpy_int (PyObject *self)
+{
+  struct value *value = ((value_object *) self)->value;
+  struct type *type = value_type (value);
+  LONGEST l = 0;
+  volatile struct gdb_exception except;
+
+  CHECK_TYPEDEF (type);
+  if (!is_intlike (type, 0))
+    {
+      PyErr_SetString (PyExc_RuntimeError, "cannot convert value to int");
+      return NULL;
+    }
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      l = value_as_long (value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return PyInt_FromLong (l);
+}
+
+/* Implements conversion to long.  */
+static PyObject *
+valpy_long (PyObject *self)
+{
+  struct value *value = ((value_object *) self)->value;
+  struct type *type = value_type (value);
+  LONGEST l = 0;
+  volatile struct gdb_exception except;
+
+  if (!is_intlike (type, 1))
+    {
+      PyErr_SetString (PyExc_RuntimeError, "cannot convert value to long");
+      return NULL;
+    }
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      l = value_as_long (value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return PyLong_FromLong (l);
+}
+
+/* Implements conversion to float.  */
+static PyObject *
+valpy_float (PyObject *self)
+{
+  struct value *value = ((value_object *) self)->value;
+  struct type *type = value_type (value);
+  double d = 0;
+  volatile struct gdb_exception except;
+
+  CHECK_TYPEDEF (type);
+  if (TYPE_CODE (type) != TYPE_CODE_FLT)
+    {
+      PyErr_SetString (PyExc_RuntimeError, "cannot convert value to float");
+      return NULL;
+    }
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      d = value_as_double (value);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return PyFloat_FromDouble (d);
+}
+
+/* Returns an object for a value which is released from the all_values chain,
+   so its lifetime is not bound to the execution of a command.  */
+PyObject *
+value_to_value_object (struct value *val)
+{
+  value_object *val_obj;
+
+  val_obj = PyObject_New (value_object, &value_object_type);
+  if (val_obj != NULL)
+    {
+      val_obj->value = val;
+      value_incref (val);
+      val_obj->address = NULL;
+      val_obj->type = NULL;
+      note_value (val_obj);
+    }
+
+  return (PyObject *) val_obj;
+}
+
+/* Returns a borrowed reference to the struct value corresponding to
+   the given value object.  */
+struct value *
+value_object_to_value (PyObject *self)
+{
+  value_object *real;
+  if (! PyObject_TypeCheck (self, &value_object_type))
+    return NULL;
+  real = (value_object *) self;
+  return real->value;
+}
+
+/* Try to convert a Python value to a gdb value.  If the value cannot
+   be converted, set a Python exception and return NULL.  Returns a
+   reference to a new value on the all_values chain.  */
+
+struct value *
+convert_value_from_python (PyObject *obj)
+{
+  struct value *value = NULL; /* -Wall */
+  PyObject *target_str, *unicode_str;
+  struct cleanup *old;
+  volatile struct gdb_exception except;
+  int cmp;
+
+  gdb_assert (obj != NULL);
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      if (PyBool_Check (obj)) 
+	{
+	  cmp = PyObject_IsTrue (obj);
+	  if (cmp >= 0)
+	    value = value_from_longest (builtin_type_pybool, cmp);
+	}
+      else if (PyInt_Check (obj))
+	{
+	  long l = PyInt_AsLong (obj);
+
+	  if (! PyErr_Occurred ())
+	    value = value_from_longest (builtin_type_pyint, l);
+	}
+      else if (PyLong_Check (obj))
+	{
+	  LONGEST l = PyLong_AsLongLong (obj);
+
+	  if (! PyErr_Occurred ())
+	    value = value_from_longest (builtin_type_pylong, l);
+	}
+      else if (PyFloat_Check (obj))
+	{
+	  double d = PyFloat_AsDouble (obj);
+
+	  if (! PyErr_Occurred ())
+	    value = value_from_double (builtin_type_pyfloat, d);
+	}
+      else if (gdbpy_is_string (obj))
+	{
+	  char *s;
+
+	  s = python_string_to_target_string (obj);
+	  if (s != NULL)
+	    {
+	      old = make_cleanup (xfree, s);
+	      value = value_cstring (s, strlen (s), builtin_type_pychar);
+	      do_cleanups (old);
+	    }
+	}
+      else if (PyObject_TypeCheck (obj, &value_object_type))
+	value = value_copy (((value_object *) obj)->value);
+      else
+	PyErr_Format (PyExc_TypeError, _("Could not convert Python object: %s"),
+		      PyString_AsString (PyObject_Str (obj)));
+    }
+  if (except.reason < 0)
+    {
+      PyErr_Format (except.reason == RETURN_QUIT
+		    ? PyExc_KeyboardInterrupt : PyExc_RuntimeError,
+		    "%s", except.message);
+      return NULL;
+    }
+
+  return value;
+}
+
+/* Returns value object in the ARGth position in GDB's history.  */
+PyObject *
+gdbpy_history (PyObject *self, PyObject *args)
+{
+  int i;
+  struct value *res_val = NULL;	  /* Initialize to appease gcc warning.  */
+  volatile struct gdb_exception except;
+
+  if (!PyArg_ParseTuple (args, "i", &i))
+    return NULL;
+
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      res_val = access_value_history (i);
+    }
+  GDB_PY_HANDLE_EXCEPTION (except);
+
+  return value_to_value_object (res_val);
+}
+
+void
+gdbpy_initialize_values (void)
+{
+  if (PyType_Ready (&value_object_type) < 0)
+    return;
+
+  Py_INCREF (&value_object_type);
+  PyModule_AddObject (gdb_module, "Value", (PyObject *) &value_object_type);
+
+  values_in_python = NULL;
+}
+
+
+
+static PyGetSetDef value_object_getset[] = {
+  { "address", valpy_get_address, NULL, "The address of the value.",
+    NULL },
+  { "is_optimized_out", valpy_get_is_optimized_out, NULL,
+    "Boolean telling whether the value is optimized out (i.e., not available).",
+    NULL },
+  { "type", valpy_get_type, NULL, "Type of the value.", NULL },
+  {NULL}  /* Sentinel */
+};
+
+static PyMethodDef value_object_methods[] = {
+  { "cast", valpy_cast, METH_VARARGS, "Cast the value to the supplied type." },
+  { "dereference", valpy_dereference, METH_NOARGS, "Dereferences the value." },
+  { "string", (PyCFunction) valpy_string, METH_VARARGS | METH_KEYWORDS,
+    "string ([encoding] [, errors] [, length]) -> string\n\
+Return Unicode string representation of the value." },
+  {NULL}  /* Sentinel */
+};
+
+static PyNumberMethods value_object_as_number = {
+  valpy_add,
+  valpy_subtract,
+  valpy_multiply,
+  valpy_divide,
+  valpy_remainder,
+  NULL,			      /* nb_divmod */
+  valpy_power,		      /* nb_power */
+  valpy_negative,	      /* nb_negative */
+  valpy_positive,	      /* nb_positive */
+  valpy_absolute,	      /* nb_absolute */
+  valpy_nonzero,	      /* nb_nonzero */
+  valpy_invert,		      /* nb_invert */
+  valpy_lsh,		      /* nb_lshift */
+  valpy_rsh,		      /* nb_rshift */
+  valpy_and,		      /* nb_and */
+  valpy_xor,		      /* nb_xor */
+  valpy_or,		      /* nb_or */
+  NULL,			      /* nb_coerce */
+  valpy_int,		      /* nb_int */
+  valpy_long,		      /* nb_long */
+  valpy_float,		      /* nb_float */
+  NULL,			      /* nb_oct */
+  NULL			      /* nb_hex */
+};
+
+static PyMappingMethods value_object_as_mapping = {
+  valpy_length,
+  valpy_getitem,
+  valpy_setitem
+};
+
+PyTypeObject value_object_type = {
+  PyObject_HEAD_INIT (NULL)
+  0,				  /*ob_size*/
+  "gdb.Value",			  /*tp_name*/
+  sizeof (value_object),	  /*tp_basicsize*/
+  0,				  /*tp_itemsize*/
+  valpy_dealloc,		  /*tp_dealloc*/
+  0,				  /*tp_print*/
+  0,				  /*tp_getattr*/
+  0,				  /*tp_setattr*/
+  0,				  /*tp_compare*/
+  0,				  /*tp_repr*/
+  &value_object_as_number,	  /*tp_as_number*/
+  0,				  /*tp_as_sequence*/
+  &value_object_as_mapping,	  /*tp_as_mapping*/
+  0,				  /*tp_hash */
+  0,				  /*tp_call*/
+  valpy_str,			  /*tp_str*/
+  0,				  /*tp_getattro*/
+  0,				  /*tp_setattro*/
+  0,				  /*tp_as_buffer*/
+  Py_TPFLAGS_DEFAULT | Py_TPFLAGS_CHECKTYPES,	/*tp_flags*/
+  "GDB value object",		  /* tp_doc */
+  0,				  /* tp_traverse */
+  0,				  /* tp_clear */
+  valpy_richcompare,		  /* tp_richcompare */
+  0,				  /* tp_weaklistoffset */
+  0,				  /* tp_iter */
+  0,				  /* tp_iternext */
+  value_object_methods,		  /* tp_methods */
+  0,				  /* tp_members */
+  value_object_getset,		  /* tp_getset */
+  0,				  /* tp_base */
+  0,				  /* tp_dict */
+  0,				  /* tp_descr_get */
+  0,				  /* tp_descr_set */
+  0,				  /* tp_dictoffset */
+  0,				  /* tp_init */
+  0,				  /* tp_alloc */
+  valpy_new			  /* tp_new */
+};
+
+#else
+
+void
+preserve_python_values (struct objfile *objfile, htab_t copied_types)
+{
+  /* Nothing.  */
+}
+
+#endif /* HAVE_PYTHON */