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Use gdbpy_ref in py-prettyprint.c 

This changes some spots in py-prettyprint.c to use gdbpy_ref.  It also
changes push_dummy_python_frame to be a class, rather than having it
create a cleanup.

2017-01-10  Tom Tromey  <tom@tromey.com>

	* python/py-prettyprint.c (print_stack_unless_memory_error)
	(print_string_repr, print_children): Use gdbpy_ref.
	(dummy_python_frame): New class.
	(dummy_python_frame::dummy_python_frame): Rename from
	push_dummy_python_frame.
	(py_restore_tstate): Remove.
This commit is contained in:
Tom Tromey 2016-11-12 12:07:16 -07:00
parent 3b4e0e01f8
commit 2bd5759dcb
2 changed files with 102 additions and 115 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2017-01-10 Tom Tromey <tom@tromey.com>
* python/py-prettyprint.c (print_stack_unless_memory_error)
(print_string_repr, print_children): Use gdbpy_ref.
(dummy_python_frame): New class.
(dummy_python_frame::dummy_python_frame): Rename from
push_dummy_python_frame.
(py_restore_tstate): Remove.
2017-01-10 Tom Tromey <tom@tromey.com>
* python/py-framefilter.c (py_print_frame): Use gdbpy_ref.

208
gdb/python/py-prettyprint.c
View File

@ -252,13 +252,13 @@ print_stack_unless_memory_error (struct ui_file *stream)
{
if (PyErr_ExceptionMatches (gdbpy_gdb_memory_error))
{
struct cleanup *cleanup;
PyObject *type, *value, *trace;
PyErr_Fetch (&type, &value, &trace);
cleanup = make_cleanup_py_decref (type);
make_cleanup_py_decref (value);
make_cleanup_py_decref (trace);
gdbpy_ref type_ref (type);
gdbpy_ref value_ref (value);
gdbpy_ref trace_ref (trace);
gdb::unique_xmalloc_ptr<char>
msg (gdbpy_exception_to_string (type, value));
@ -268,8 +268,6 @@ print_stack_unless_memory_error (struct ui_file *stream)
else
fprintf_filtered (stream, _("<error reading variable: %s>"),
msg.get ());
do_cleanups (cleanup);
}
else
gdbpy_print_stack ();
@ -286,17 +284,14 @@ print_string_repr (PyObject *printer, const char *hint,
struct gdbarch *gdbarch)
{
struct value *replacement = NULL;
PyObject *py_str = NULL;
enum string_repr_result result = string_repr_ok;
py_str = pretty_print_one_value (printer, &replacement);
if (py_str)
gdbpy_ref py_str (pretty_print_one_value (printer, &replacement));
if (py_str != NULL)
{
struct cleanup *cleanup = make_cleanup_py_decref (py_str);
if (py_str == Py_None)
result = string_repr_none;
else if (gdbpy_is_lazy_string (py_str))
else if (gdbpy_is_lazy_string (py_str.get ()))
{
CORE_ADDR addr;
long length;
@ -304,7 +299,7 @@ print_string_repr (PyObject *printer, const char *hint,
gdb::unique_xmalloc_ptr<char> encoding;
struct value_print_options local_opts = *options;
gdbpy_extract_lazy_string (py_str, &addr, &type,
gdbpy_extract_lazy_string (py_str.get (), &addr, &type,
&length, &encoding);
local_opts.addressprint = 0;
@ -313,22 +308,20 @@ print_string_repr (PyObject *printer, const char *hint,
}
else
{
PyObject *string;
string = python_string_to_target_python_string (py_str);
if (string)
gdbpy_ref string
(python_string_to_target_python_string (py_str.get ()));
if (string != NULL)
{
char *output;
long length;
struct type *type;
make_cleanup_py_decref (string);
#ifdef IS_PY3K
output = PyBytes_AS_STRING (string);
length = PyBytes_GET_SIZE (string);
output = PyBytes_AS_STRING (string.get ());
length = PyBytes_GET_SIZE (string.get ());
#else
output = PyString_AsString (string);
length = PyString_Size (string);
output = PyString_AsString (string.get ());
length = PyString_Size (string.get ());
#endif
type = builtin_type (gdbarch)->builtin_char;
@ -344,8 +337,6 @@ print_string_repr (PyObject *printer, const char *hint,
print_stack_unless_memory_error (stream);
}
}
do_cleanups (cleanup);
}
else if (replacement)
{
@ -364,80 +355,84 @@ print_string_repr (PyObject *printer, const char *hint,
}
#ifndef IS_PY3K
static void
py_restore_tstate (void *p)
{
PyFrameObject *frame = (PyFrameObject *) p;
PyThreadState *tstate = PyThreadState_GET ();
tstate->frame = frame;
}
/* Create a dummy PyFrameObject, needed to work around
a Python-2.4 bug with generators. */
static PyObject *
push_dummy_python_frame (void)
class dummy_python_frame
{
public:
dummy_python_frame ();
~dummy_python_frame ()
{
if (m_valid)
m_tstate->frame = m_saved_frame;
}
bool failed () const
{
return !m_valid;
}
private:
bool m_valid;
PyFrameObject *m_saved_frame;
gdbpy_ref m_frame;
PyThreadState *m_tstate;
};
dummy_python_frame::dummy_python_frame ()
: m_valid (false),
m_saved_frame (NULL),
m_tstate (NULL)
{
PyObject *empty_string, *null_tuple, *globals;
PyCodeObject *code;
PyFrameObject *frame;
PyThreadState *tstate;
empty_string = PyString_FromString ("");
if (!empty_string)
return NULL;
gdbpy_ref empty_string (PyString_FromString (""));
if (empty_string == NULL)
return;
null_tuple = PyTuple_New (0);
if (!null_tuple)
{
Py_DECREF (empty_string);
return NULL;
}
gdbpy_ref null_tuple (PyTuple_New (0));
if (null_tuple == NULL)
return;
code = PyCode_New (0, /* argcount */
0, /* nlocals */
0, /* stacksize */
0, /* flags */
empty_string, /* code */
null_tuple, /* consts */
null_tuple, /* names */
null_tuple, /* varnames */
code = PyCode_New (0, /* argcount */
0, /* locals */
0, /* stacksize */
0, /* flags */
empty_string.get (), /* code */
null_tuple.get (), /* consts */
null_tuple.get (), /* names */
null_tuple.get (), /* varnames */
#if PYTHON_API_VERSION >= 1010
null_tuple, /* freevars */
null_tuple, /* cellvars */
null_tuple.get (), /* freevars */
null_tuple.get (), /* cellvars */
#endif
empty_string, /* filename */
empty_string, /* name */
1, /* firstlineno */
empty_string /* lnotab */
);
empty_string.get (), /* filename */
empty_string.get (), /* name */
1, /* firstlineno */
empty_string.get () /* lnotab */
);
if (code == NULL)
return;
gdbpy_ref code_holder ((PyObject *) code);
Py_DECREF (empty_string);
Py_DECREF (null_tuple);
gdbpy_ref globals (PyDict_New ());
if (globals == NULL)
return;
if (!code)
return NULL;
m_tstate = PyThreadState_GET ();
frame = PyFrame_New (m_tstate, code, globals.get (), NULL);
if (frame == NULL)
return;
globals = PyDict_New ();
if (!globals)
{
Py_DECREF (code);
return NULL;
}
tstate = PyThreadState_GET ();
frame = PyFrame_New (tstate, code, globals, NULL);
Py_DECREF (globals);
Py_DECREF (code);
if (!frame)
return NULL;
tstate->frame = frame;
make_cleanup (py_restore_tstate, frame->f_back);
return (PyObject *) frame;
m_frame.reset ((PyObject *) frame);
m_tstate->frame = frame;
m_saved_frame = frame->f_back;
m_valid = true;
}
#endif
@ -453,11 +448,6 @@ print_children (PyObject *printer, const char *hint,
{
int is_map, is_array, done_flag, pretty;
unsigned int i;
PyObject *children, *iter;
#ifndef IS_PY3K
PyObject *frame;
#endif
struct cleanup *cleanups;
if (! PyObject_HasAttr (printer, gdbpy_children_cst))
return;
@ -467,23 +457,20 @@ print_children (PyObject *printer, const char *hint,
is_map = hint && ! strcmp (hint, "map");
is_array = hint && ! strcmp (hint, "array");
children = PyObject_CallMethodObjArgs (printer, gdbpy_children_cst,
NULL);
if (! children)
gdbpy_ref children (PyObject_CallMethodObjArgs (printer, gdbpy_children_cst,
NULL));
if (children == NULL)
{
print_stack_unless_memory_error (stream);
return;
}
cleanups = make_cleanup_py_decref (children);
iter = PyObject_GetIter (children);
if (!iter)
gdbpy_ref iter (PyObject_GetIter (children.get ()));
if (iter == NULL)
{
print_stack_unless_memory_error (stream);
goto done;
return;
}
make_cleanup_py_decref (iter);
/* Use the prettyformat_arrays option if we are printing an array,
and the pretty option otherwise. */
@ -501,23 +488,22 @@ print_children (PyObject *printer, const char *hint,
where it insists on having a non-NULL tstate->frame when
a generator is called. */
#ifndef IS_PY3K
frame = push_dummy_python_frame ();
if (!frame)
dummy_python_frame frame;
if (frame.failed ())
{
gdbpy_print_stack ();
goto done;
return;
}
make_cleanup_py_decref (frame);
#endif
done_flag = 0;
for (i = 0; i < options->print_max; ++i)
{
PyObject *py_v, *item = PyIter_Next (iter);
PyObject *py_v;
const char *name;
struct cleanup *inner_cleanup;
if (! item)
gdbpy_ref item (PyIter_Next (iter.get ()));
if (item == NULL)
{
if (PyErr_Occurred ())
print_stack_unless_memory_error (stream);
@ -528,16 +514,15 @@ print_children (PyObject *printer, const char *hint,
break;
}
if (! PyTuple_Check (item) || PyTuple_Size (item) != 2)
if (! PyTuple_Check (item.get ()) || PyTuple_Size (item.get ()) != 2)
{
PyErr_SetString (PyExc_TypeError,
_("Result of children iterator not a tuple"
" of two elements."));
gdbpy_print_stack ();
Py_DECREF (item);
continue;
}
if (! PyArg_ParseTuple (item, "sO", &name, &py_v))
if (! PyArg_ParseTuple (item.get (), "sO", &name, &py_v))
{
/* The user won't necessarily get a stack trace here, so provide
more context. */
@ -545,10 +530,8 @@ print_children (PyObject *printer, const char *hint,
fprintf_unfiltered (gdb_stderr,
_("Bad result from children iterator.\n"));
gdbpy_print_stack ();
Py_DECREF (item);
continue;
}
inner_cleanup = make_cleanup_py_decref (item);
/* Print initial "{". For other elements, there are three
cases:
@ -643,8 +626,6 @@ print_children (PyObject *printer, const char *hint,
if (is_map && i % 2 == 0)
fputs_filtered ("] = ", stream);
do_cleanups (inner_cleanup);
}
if (i)
@ -665,9 +646,6 @@ print_children (PyObject *printer, const char *hint,
}
fputs_filtered ("}", stream);
}
done:
do_cleanups (cleanups);
}
enum ext_lang_rc