Add support for Python 3.

* NEWS: Mention Python 3 support.
* varobj.c (value_get_print_value): Use
python_string_to_target_string.
* python/py-block.c: Use PyVarObject_HEAD_INIT in initialization
of type objects.
* python/py-breakpoint.c: Ditto.
* python/py-cmd.c:  Ditto.
* python/py-event.c: Ditto.
* python/py-event.h: Ditto.
* python/py-evtregistry.c: Ditto.
* python/py-finishbreakpoint.c: Ditto.
* python/py-frame.c: Ditto.
* python/py-function.c: Ditto.
* python/py-infthread.c: Ditto.
* python/py-lazy-string.c: Ditto.
* python/py-progspace.c: Ditto.
* /python/py-symbol.c: Ditto.
* python/py-evts.c:  (gdbpy_initialize_py_events): Add module
initialization for Python 3.
* python/py-inferior.c: Use PyVarObject_HEAD_INIT in initialization
of type objects.
(infpy_read_memory): Return memoryview object if Python 3.
(infpy_write_memory): Use "s*" operand parsing code for Python 3.
(infpy_search_memory): Ditto.
(get_buffer): New function for Python 3.
* python/py-objfile.c: Use PyVarObject_HEAD_INIT in initialization
of type objects.
(objfpy_dealloc): Use Py_TYPE to call tp_free.
* python/py-param.c: Use PyVarObject_HEAD_INIT in initialization
of type objects.
(get_attr): Use PyUnicode_CompareWithASCIIString if Python 3.
(set_attr): Ditto.
* python/py-prettyprint.c (print_string_repr): use PyBytes methods
instead of PyString methods if Python 3.
(print_children): Skip push_dummy_python_frame call if Python 3.
* python/py-symtab.c: Use PyVarObject_HEAD_INIT in initialization
of type objects.
(salpy_dealloc): Use Py_TYPE to call tp_free.
* python/py-type.c: Use PyVarObject_HEAD_INIT in initialization
of type objects.
(field_dealloc): Use Py_TYPE to call tp_free.
(typy_dealloc): Ditto.
(type_object_as_number): Adjust struct initializations for
differences in layout for Python 2 vs. Python 3.
* python/py-utils.c (python_string_to_unicode): Omit non-Unicode
string case for Python 3.
(unicode_to_encoded_python_string): Shorten code (no functional
change).
(python_string_to_target_python_string): Comment that in Python 3
returned value is a Python "bytes" type.
(gdbpy_is_string): Omit non-Unicode string check in Python 3.
(gdb_py_object_from_longest): Omit non-long integer case in Python
3.
(gdb_py_object_from_ulongest): Ditto.
* python/py-value.c: Use PyVarObject_HEAD_INIT in initialization
of type objects.
(valpy_dealloc): Use Py_TYPE to call tp_free.
(valpy_int): Omit function if Python 3.
(convert_value_from_python): Use "%S" format (Python object as a
string) if Python 3.
(value_object_as_number): Adjust struct initializations for
differences in layout for Python 2 vs. Python 3.
* python/python-config.py: Adjust syntax for Python 3
compatibility.
Include "sys.abiflags" string as part of python library name, if
that attribute exists (Python 3).
* python/python-internal.h (IS_PY3): Define if Python 3.
(Py_TPFLAGS_HAVE_ITER, Py_TPFLAGS_CHECKTYPES): Define with
placeholder value if Python 3.
(PyInt_Check, PyInt_FromLong, PyInt_AsLong, PyString_FromString,
PyString_Decode, PyString_FromFormat, PyString_Check): Define as
analogous Python 3 API function if Python 3.
(PyVarObject_HEAD_INIT): Define if not already defined.
(Py_TYPE): Ditto.
* python/python.c (eval_python_command): Omit Py_FlushLine call if
Python 3.
Check return values of all Python API calls for error.
Supply dummy "python" and "python-interactive" commands if Python
initialization failed.
(_initialize_python): Convert argc to wchar_t** if Python 3.
Add module initialization for Python 3.
(finish_python_initialization): Pass wchar_t * argument to
PySys_SetPath if Python 3.
* python/lib/gdb/__init__.py: Define "reload" if Python 3.
(_GdbFile): New class for common output file behavior.
(GdbOutFile): Subclass from _GdbFile.
(GdbOutputErrorFile): Ditto.
(auto_load_packages): Adjust syntax for Python 3 compatibility.
* python/lib/gdb/printing.py: Define basestr and int if Python 3.
* python/lib/gdb/prompt.py: Use sorted() function rather than
sort() method.
* python/lib/gdb/command/explore.py: Define raw_input if Python 3.
Adjust syntax for Python 3 compatibility.
* python/lib/gdb/command/pretty_printers.py: Use sorted() function
rather than sort() method.
Adjust syntax for Python 3 compatibility.
* python/lib/gdb/command/type_printers.py: Ditto.
* doc/gdb.texinfo (Inferior.read_memory): Mention that the return
value is a memoryview object if Python 3.

gdb/python/python.c

@@ -70,9 +70,14 @@ static const char *gdbpy_should_print_stack = python_excp_message;
 #include "gdbthread.h"
 #include "observer.h"
 #include "interps.h"
+#include "event-top.h"
 
 static PyMethodDef GdbMethods[];
 
+#ifdef IS_PY3K
+static struct PyModuleDef GdbModuleDef;
+#endif
+
 PyObject *gdb_module;
 PyObject *gdb_python_module;
 
@@ -198,8 +203,10 @@ eval_python_command (const char *command)
     return -1;
 
   Py_DECREF (v);
+#ifndef IS_PY3K
   if (Py_FlushLine ())
     PyErr_Clear ();
+#endif
 
   return 0;
 }
@@ -1431,6 +1438,13 @@ _initialize_python (void)
 {
   char *cmd_name;
   struct cmd_list_element *cmd;
+  char *progname;
+#ifdef IS_PY3K
+  int i;
+  size_t progsize, count;
+  char *oldloc;
+  wchar_t *progname_copy;
+#endif
 
   add_com ("python-interactive", class_obscure,
 	   python_interactive_command,
@@ -1510,14 +1524,50 @@ message == an error message without a stack will be printed."),
      /foo/bin/python
      /foo/lib/pythonX.Y/...
      This must be done before calling Py_Initialize.  */
-  Py_SetProgramName (concat (ldirname (python_libdir), SLASH_STRING, "bin",
-			     SLASH_STRING, "python", NULL));
+  progname = concat (ldirname (python_libdir), SLASH_STRING, "bin",
+		     SLASH_STRING, "python", NULL);
+#ifdef IS_PY3K
+  oldloc = setlocale (LC_ALL, NULL);
+  setlocale (LC_ALL, "");
+  progsize = strlen (progname);
+  if (progsize == (size_t) -1)
+    {
+      fprintf (stderr, "Could not convert python path to string\n");
+      return;
+    }
+  progname_copy = PyMem_Malloc ((progsize + 1) * sizeof (wchar_t));
+  if (!progname_copy)
+    {
+      fprintf (stderr, "out of memory\n");
+      return;
+    }
+  count = mbstowcs (progname_copy, progname, progsize + 1);
+  if (count == (size_t) -1)
+    {
+      fprintf (stderr, "Could not convert python path to string\n");
+      return;
+    }
+  setlocale (LC_ALL, oldloc);
+
+  /* Note that Py_SetProgramName expects the string it is passed to
+     remain alive for the duration of the program's execution, so
+     it is not freed after this call.  */
+  Py_SetProgramName (progname_copy);
+#else
+  Py_SetProgramName (progname);
+#endif
 #endif
 
   Py_Initialize ();
   PyEval_InitThreads ();
 
+#ifdef IS_PY3K
+  gdb_module = PyModule_Create (&GdbModuleDef);
+  /* Add _gdb module to the list of known built-in modules.  */
+  _PyImport_FixupBuiltin (gdb_module, "_gdb");
+#else
   gdb_module = Py_InitModule ("_gdb", GdbMethods);
+#endif
 
   /* The casts to (char*) are for python 2.4.  */
   PyModule_AddStringConstant (gdb_module, "VERSION", (char*) version);
@@ -1612,7 +1662,17 @@ finish_python_initialization (void)
 
   sys_path = PySys_GetObject ("path");
 
-  if (sys_path && PyList_Check (sys_path))
+  /* If sys.path is not defined yet, define it first.  */
+  if (!(sys_path && PyList_Check (sys_path)))
+    {
+#ifdef IS_PY3K
+      PySys_SetPath (L"");
+#else
+      PySys_SetPath ("");
+#endif
+      sys_path = PySys_GetObject ("path");
+    }
+  if (sys_path && PyList_Check (sys_path))  
     {
       PyObject *pythondir;
       int err;
@@ -1628,7 +1688,7 @@ finish_python_initialization (void)
       Py_DECREF (pythondir);
     }
   else
-    PySys_SetPath (gdb_pythondir);
+    goto fail;
 
   /* Import the gdb module to finish the initialization, and
      add it to __main__ for convenience.  */
@@ -1768,4 +1828,18 @@ Return a tuple containing all inferiors." },
   {NULL, NULL, 0, NULL}
 };
 
+#ifdef IS_PY3K
+static struct PyModuleDef GdbModuleDef =
+{
+  PyModuleDef_HEAD_INIT,
+  "_gdb",
+  NULL,
+  -1, 
+  GdbMethods,
+  NULL,
+  NULL,
+  NULL,
+  NULL
+};
+#endif
 #endif /* HAVE_PYTHON */