/* Python frame unwinder interface.
- Copyright (C) 2015-2016 Free Software Foundation, Inc.
+ Copyright (C) 2015-2020 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdb_obstack.h"
#include "gdbcmd.h"
#include "language.h"
-#include "observer.h"
+#include "observable.h"
#include "python-internal.h"
#include "regcache.h"
#include "valprint.h"
/* Saved registers array item. */
-typedef struct
+struct saved_reg
{
+ saved_reg (int n, gdbpy_ref<> &&v)
+ : number (n),
+ value (std::move (v))
+ {
+ }
+
int number;
- PyObject *value;
-} saved_reg;
-DEF_VEC_O (saved_reg);
+ gdbpy_ref<> value;
+};
/* The data we keep for the PyUnwindInfo: pending_frame, saved registers
and frame ID. */
struct frame_id frame_id;
/* Saved registers array. */
- VEC (saved_reg) *saved_regs;
+ std::vector<saved_reg> *saved_regs;
} unwind_info_object;
/* The data we keep for a frame we can unwind: frame ID and an array of
(register_number, register_value) pairs. */
-struct reg_info
-{
- /* Register number. */
- int number;
-
- /* Register data bytes pointer. */
- gdb_byte data[MAX_REGISTER_SIZE];
-};
-
typedef struct
{
/* Frame ID. */
/* Length of the `reg' array below. */
int reg_count;
- struct reg_info reg[];
+ cached_reg_t reg[];
} cached_frame_info;
extern PyTypeObject pending_frame_object_type
return 0;
if (gdbpy_is_string (pyo_reg_id))
{
- const char *reg_name = gdbpy_obj_to_string (pyo_reg_id);
+ gdb::unique_xmalloc_ptr<char> reg_name (gdbpy_obj_to_string (pyo_reg_id));
if (reg_name == NULL)
return 0;
- *reg_num = user_reg_map_name_to_regnum (gdbarch, reg_name,
- strlen (reg_name));
+ *reg_num = user_reg_map_name_to_regnum (gdbarch, reg_name.get (),
+ strlen (reg_name.get ()));
return *reg_num >= 0;
}
else if (PyInt_Check (pyo_reg_id))
int rc = 0;
struct value *value;
- TRY
+ try
{
if ((value = value_object_to_value (pyo_value)) != NULL)
{
rc = 1;
}
}
- CATCH (except, RETURN_MASK_ALL)
+ catch (const gdb_exception &except)
{
gdbpy_convert_exception (except);
}
- END_CATCH
return rc;
}
if (PyObject_HasAttrString (pyo, attr_name))
{
- PyObject *pyo_value = PyObject_GetAttrString (pyo, attr_name);
- struct value *value;
+ gdbpy_ref<> pyo_value (PyObject_GetAttrString (pyo, attr_name));
if (pyo_value != NULL && pyo_value != Py_None)
{
- rc = pyuw_value_obj_to_pointer (pyo_value, addr);
+ rc = pyuw_value_obj_to_pointer (pyo_value.get (), addr);
if (!rc)
PyErr_Format (
PyExc_ValueError,
_("The value of the '%s' attribute is not a pointer."),
attr_name);
}
- Py_XDECREF (pyo_value);
}
return rc;
}
static PyObject *
unwind_infopy_str (PyObject *self)
{
- struct ui_file *strfile = mem_fileopen ();
unwind_info_object *unwind_info = (unwind_info_object *) self;
- pending_frame_object *pending_frame
- = (pending_frame_object *) (unwind_info->pending_frame);
- PyObject *result;
+ string_file stb;
- fprintf_unfiltered (strfile, "Frame ID: ");
- fprint_frame_id (strfile, unwind_info->frame_id);
+ stb.puts ("Frame ID: ");
+ fprint_frame_id (&stb, unwind_info->frame_id);
{
- char *sep = "";
- int i;
+ const char *sep = "";
struct value_print_options opts;
- saved_reg *reg;
get_user_print_options (&opts);
- fprintf_unfiltered (strfile, "\nSaved registers: (");
- for (i = 0;
- i < VEC_iterate (saved_reg, unwind_info->saved_regs, i, reg);
- i++)
+ stb.printf ("\nSaved registers: (");
+ for (const saved_reg ® : *unwind_info->saved_regs)
{
- struct value *value = value_object_to_value (reg->value);
+ struct value *value = value_object_to_value (reg.value.get ());
- fprintf_unfiltered (strfile, "%s(%d, ", sep, reg->number);
+ stb.printf ("%s(%d, ", sep, reg.number);
if (value != NULL)
{
- TRY
+ try
{
- value_print (value, strfile, &opts);
- fprintf_unfiltered (strfile, ")");
+ value_print (value, &stb, &opts);
+ stb.puts (")");
}
- CATCH (except, RETURN_MASK_ALL)
+ catch (const gdb_exception &except)
{
GDB_PY_HANDLE_EXCEPTION (except);
}
- END_CATCH
}
else
- fprintf_unfiltered (strfile, "<BAD>)");
+ stb.puts ("<BAD>)");
sep = ", ";
}
- fprintf_unfiltered (strfile, ")");
+ stb.puts (")");
}
- {
- char *s = ui_file_xstrdup (strfile, NULL);
- result = PyString_FromString (s);
- xfree (s);
- }
- ui_file_delete (strfile);
- return result;
+ return PyString_FromString (stb.c_str ());
}
/* Create UnwindInfo instance for given PendingFrame and frame ID.
unwind_info->frame_id = frame_id;
Py_INCREF (pyo_pending_frame);
unwind_info->pending_frame = pyo_pending_frame;
- unwind_info->saved_regs = VEC_alloc (saved_reg, 4);
+ unwind_info->saved_regs = new std::vector<saved_reg>;
return (PyObject *) unwind_info;
}
}
}
{
- int i;
- saved_reg *reg;
-
- for (i = 0; VEC_iterate (saved_reg, unwind_info->saved_regs, i, reg); i++)
+ gdbpy_ref<> new_value = gdbpy_ref<>::new_reference (pyo_reg_value);
+ bool found = false;
+ for (saved_reg ® : *unwind_info->saved_regs)
{
- if (regnum == reg->number)
+ if (regnum == reg.number)
{
- Py_DECREF (reg->value);
+ found = true;
+ reg.value = std::move (new_value);
break;
}
}
- if (reg == NULL)
- {
- reg = VEC_safe_push (saved_reg, unwind_info->saved_regs, NULL);
- reg->number = regnum;
- }
- Py_INCREF (pyo_reg_value);
- reg->value = pyo_reg_value;
+ if (!found)
+ unwind_info->saved_regs->emplace_back (regnum, std::move (new_value));
}
Py_RETURN_NONE;
}
unwind_infopy_dealloc (PyObject *self)
{
unwind_info_object *unwind_info = (unwind_info_object *) self;
- int i;
- saved_reg *reg;
Py_XDECREF (unwind_info->pending_frame);
- for (i = 0; VEC_iterate (saved_reg, unwind_info->saved_regs, i, reg); i++)
- Py_DECREF (reg->value);
- VEC_free (saved_reg, unwind_info->saved_regs);
+ delete unwind_info->saved_regs;
Py_TYPE (self)->tp_free (self);
}
if (frame == NULL)
return PyString_FromString ("Stale PendingFrame instance");
- TRY
+ try
{
sp_str = core_addr_to_string_nz (get_frame_sp (frame));
pc_str = core_addr_to_string_nz (get_frame_pc (frame));
}
- CATCH (except, RETURN_MASK_ALL)
+ catch (const gdb_exception &except)
{
GDB_PY_HANDLE_EXCEPTION (except);
}
- END_CATCH
return PyString_FromFormat ("SP=%s,PC=%s", sp_str, pc_str);
}
return NULL;
}
- TRY
+ try
{
- val = get_frame_register_value (pending_frame->frame_info, regnum);
+ /* Fetch the value associated with a register, whether it's
+ a real register or a so called "user" register, like "pc",
+ which maps to a real register. In the past,
+ get_frame_register_value() was used here, which did not
+ handle the user register case. */
+ val = value_of_register (regnum, pending_frame->frame_info);
if (val == NULL)
PyErr_Format (PyExc_ValueError,
"Cannot read register %d from frame.",
regnum);
}
- CATCH (except, RETURN_MASK_ALL)
+ catch (const gdb_exception &except)
{
GDB_PY_HANDLE_EXCEPTION (except);
}
- END_CATCH
return val == NULL ? NULL : value_to_value_object (val);
}
frame_id_build_special (sp, pc, special));
}
-/* Invalidate PendingFrame instance. */
-
-static void
-pending_frame_invalidate (void *pyo_pending_frame)
-{
- if (pyo_pending_frame != NULL)
- ((pending_frame_object *) pyo_pending_frame)->frame_info = NULL;
-}
-
/* frame_unwind.this_id method. */
static void
int regnum)
{
cached_frame_info *cached_frame = (cached_frame_info *) *cache_ptr;
- struct reg_info *reg_info = cached_frame->reg;
- struct reg_info *reg_info_end = reg_info + cached_frame->reg_count;
+ cached_reg_t *reg_info = cached_frame->reg;
+ cached_reg_t *reg_info_end = reg_info + cached_frame->reg_count;
TRACE_PY_UNWIND (1, "%s (frame=%p,...,reg=%d)\n", __FUNCTION__, this_frame,
regnum);
for (; reg_info < reg_info_end; ++reg_info)
{
- if (regnum == reg_info->number)
+ if (regnum == reg_info->num)
return frame_unwind_got_bytes (this_frame, regnum, reg_info->data);
}
void **cache_ptr)
{
struct gdbarch *gdbarch = (struct gdbarch *) (self->unwind_data);
- struct cleanup *cleanups = ensure_python_env (gdbarch, current_language);
- PyObject *pyo_execute;
- PyObject *pyo_pending_frame;
- PyObject *pyo_unwind_info;
cached_frame_info *cached_frame;
+ gdbpy_enter enter_py (gdbarch, current_language);
+
TRACE_PY_UNWIND (3, "%s (SP=%s, PC=%s)\n", __FUNCTION__,
paddress (gdbarch, get_frame_sp (this_frame)),
paddress (gdbarch, get_frame_pc (this_frame)));
/* Create PendingFrame instance to pass to sniffers. */
- pyo_pending_frame = (PyObject *) PyObject_New (pending_frame_object,
- &pending_frame_object_type);
+ pending_frame_object *pfo = PyObject_New (pending_frame_object,
+ &pending_frame_object_type);
+ gdbpy_ref<> pyo_pending_frame ((PyObject *) pfo);
if (pyo_pending_frame == NULL)
- goto error;
- ((pending_frame_object *) pyo_pending_frame)->gdbarch = gdbarch;
- ((pending_frame_object *) pyo_pending_frame)->frame_info = this_frame;
- make_cleanup_py_decref (pyo_pending_frame);
- make_cleanup (pending_frame_invalidate, (void *) pyo_pending_frame);
+ {
+ gdbpy_print_stack ();
+ return 0;
+ }
+ pfo->gdbarch = gdbarch;
+ scoped_restore invalidate_frame = make_scoped_restore (&pfo->frame_info,
+ this_frame);
/* Run unwinders. */
if (gdb_python_module == NULL
- || ! PyObject_HasAttrString (gdb_python_module, "execute_unwinders"))
+ || ! PyObject_HasAttrString (gdb_python_module, "_execute_unwinders"))
{
PyErr_SetString (PyExc_NameError,
- "Installation error: gdb.execute_unwinders function "
+ "Installation error: gdb._execute_unwinders function "
"is missing");
- goto error;
+ gdbpy_print_stack ();
+ return 0;
}
- pyo_execute = PyObject_GetAttrString (gdb_python_module, "execute_unwinders");
+ gdbpy_ref<> pyo_execute (PyObject_GetAttrString (gdb_python_module,
+ "_execute_unwinders"));
if (pyo_execute == NULL)
- goto error;
- make_cleanup_py_decref (pyo_execute);
- pyo_unwind_info
- = PyObject_CallFunctionObjArgs (pyo_execute, pyo_pending_frame, NULL);
+ {
+ gdbpy_print_stack ();
+ return 0;
+ }
+
+ gdbpy_ref<> pyo_unwind_info
+ (PyObject_CallFunctionObjArgs (pyo_execute.get (),
+ pyo_pending_frame.get (), NULL));
if (pyo_unwind_info == NULL)
- goto error;
- make_cleanup_py_decref (pyo_unwind_info);
+ {
+ /* If the unwinder is cancelled due to a Ctrl-C, then propagate
+ the Ctrl-C as a GDB exception instead of swallowing it. */
+ gdbpy_print_stack_or_quit ();
+ return 0;
+ }
if (pyo_unwind_info == Py_None)
- goto cannot_unwind;
+ return 0;
/* Received UnwindInfo, cache data. */
- if (PyObject_IsInstance (pyo_unwind_info,
+ if (PyObject_IsInstance (pyo_unwind_info.get (),
(PyObject *) &unwind_info_object_type) <= 0)
error (_("A Unwinder should return gdb.UnwindInfo instance."));
{
- unwind_info_object *unwind_info = (unwind_info_object *) pyo_unwind_info;
- int reg_count = VEC_length (saved_reg, unwind_info->saved_regs);
- saved_reg *reg;
- int i;
+ unwind_info_object *unwind_info =
+ (unwind_info_object *) pyo_unwind_info.get ();
+ int reg_count = unwind_info->saved_regs->size ();
cached_frame
= ((cached_frame_info *)
cached_frame->reg_count = reg_count;
/* Populate registers array. */
- for (i = 0; VEC_iterate (saved_reg, unwind_info->saved_regs, i, reg); i++)
+ for (int i = 0; i < unwind_info->saved_regs->size (); ++i)
{
- struct value *value = value_object_to_value (reg->value);
+ saved_reg *reg = &(*unwind_info->saved_regs)[i];
+
+ struct value *value = value_object_to_value (reg->value.get ());
size_t data_size = register_size (gdbarch, reg->number);
- cached_frame->reg[i].number = reg->number;
+ cached_frame->reg[i].num = reg->number;
/* `value' validation was done before, just assert. */
gdb_assert (value != NULL);
gdb_assert (data_size == TYPE_LENGTH (value_type (value)));
- gdb_assert (data_size <= MAX_REGISTER_SIZE);
+ cached_frame->reg[i].data = (gdb_byte *) xmalloc (data_size);
memcpy (cached_frame->reg[i].data, value_contents (value), data_size);
}
}
*cache_ptr = cached_frame;
- do_cleanups (cleanups);
return 1;
-
- error:
- gdbpy_print_stack ();
- /* Fallthrough. */
- cannot_unwind:
- do_cleanups (cleanups);
- return 0;
}
/* Frame cache release shim. */
pyuw_dealloc_cache (struct frame_info *this_frame, void *cache)
{
TRACE_PY_UNWIND (3, "%s: enter", __FUNCTION__);
+ cached_frame_info *cached_frame = (cached_frame_info *) cache;
+
+ for (int i = 0; i < cached_frame->reg_count; i++)
+ xfree (cached_frame->reg[i].data);
+
xfree (cache);
}
&setdebuglist, &showdebuglist);
pyuw_gdbarch_data
= gdbarch_data_register_post_init (pyuw_gdbarch_data_init);
- observer_attach_architecture_changed (pyuw_on_new_gdbarch);
+ gdb::observers::architecture_changed.attach (pyuw_on_new_gdbarch);
if (PyType_Ready (&pending_frame_object_type) < 0)
return -1;
projects / deliverable / binutils-gdb.git / blobdiff