492d29ea1c
This patch splits the TRY_CATCH macro into three, so that we go from
this:
~~~
volatile gdb_exception ex;
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
}
if (ex.reason < 0)
{
}
~~~
to this:
~~~
TRY
{
}
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
~~~
Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.
This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.
TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:
TRY
{
}
// some code here.
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
Just like it isn't valid to do that with C++'s native try/catch.
By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.
The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved. After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch]. The result was folded into this patch so that GDB
still builds at each incremental step.
END_CATCH is necessary for two reasons:
First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:
#define CATCH(EXCEPTION, mask) \
for (struct gdb_exception EXCEPTION; \
exceptions_state_mc_catch (&EXCEPTION, MASK); \
EXCEPTION = exception_none)
would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.
Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow. That will
be done in END_CATCH.
After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.
IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.
gdb/ChangeLog.
2015-03-07 Pedro Alves <palves@redhat.com>
* common/common-exceptions.c (struct catcher) <exception>: No
longer a pointer to volatile exception. Now an exception value.
<mask>: Delete field.
(exceptions_state_mc_init): Remove all parameters. Adjust.
(exceptions_state_mc): No longer pop the catcher here.
(exceptions_state_mc_catch): New function.
(throw_exception): Adjust.
* common/common-exceptions.h (exceptions_state_mc_init): Remove
all parameters.
(exceptions_state_mc_catch): Declare.
(TRY_CATCH): Rename to ...
(TRY): ... this. Remove EXCEPTION and MASK parameters.
(CATCH, END_CATCH): New.
All callers adjusted.
gdb/gdbserver/ChangeLog:
2015-03-07 Pedro Alves <palves@redhat.com>
Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
instead.
701 lines
16 KiB
C
701 lines
16 KiB
C
/* Python interface to objfiles.
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Copyright (C) 2008-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "python-internal.h"
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#include "charset.h"
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#include "objfiles.h"
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#include "language.h"
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#include "build-id.h"
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#include "elf-bfd.h"
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#include "symtab.h"
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typedef struct
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{
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PyObject_HEAD
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/* The corresponding objfile. */
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struct objfile *objfile;
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/* Dictionary holding user-added attributes.
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This is the __dict__ attribute of the object. */
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PyObject *dict;
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/* The pretty-printer list of functions. */
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PyObject *printers;
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/* The frame filter list of functions. */
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PyObject *frame_filters;
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/* The type-printer list. */
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PyObject *type_printers;
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/* The debug method matcher list. */
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PyObject *xmethods;
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} objfile_object;
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extern PyTypeObject objfile_object_type
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CPYCHECKER_TYPE_OBJECT_FOR_TYPEDEF ("objfile_object");
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static const struct objfile_data *objfpy_objfile_data_key;
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/* Require that OBJF be a valid objfile. */
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#define OBJFPY_REQUIRE_VALID(obj) \
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do { \
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if (!(obj)->objfile) \
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{ \
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PyErr_SetString (PyExc_RuntimeError, \
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_("Objfile no longer exists.")); \
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return NULL; \
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} \
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} while (0)
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/* An Objfile method which returns the objfile's file name, or None. */
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static PyObject *
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objfpy_get_filename (PyObject *self, void *closure)
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{
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objfile_object *obj = (objfile_object *) self;
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if (obj->objfile)
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return PyString_Decode (objfile_name (obj->objfile),
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strlen (objfile_name (obj->objfile)),
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host_charset (), NULL);
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Py_RETURN_NONE;
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}
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/* An Objfile method which returns the objfile's file name, as specified
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by the user, or None. */
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static PyObject *
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objfpy_get_username (PyObject *self, void *closure)
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{
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objfile_object *obj = (objfile_object *) self;
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if (obj->objfile)
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{
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const char *username = obj->objfile->original_name;
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return PyString_Decode (username, strlen (username),
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host_charset (), NULL);
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}
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Py_RETURN_NONE;
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}
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/* If SELF is a separate debug-info file, return the "backlink" field.
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Otherwise return None. */
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static PyObject *
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objfpy_get_owner (PyObject *self, void *closure)
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{
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objfile_object *obj = (objfile_object *) self;
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struct objfile *objfile = obj->objfile;
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struct objfile *owner;
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OBJFPY_REQUIRE_VALID (obj);
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owner = objfile->separate_debug_objfile_backlink;
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if (owner != NULL)
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{
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PyObject *result = objfile_to_objfile_object (owner);
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Py_XINCREF (result);
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return result;
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}
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Py_RETURN_NONE;
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}
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/* An Objfile method which returns the objfile's build id, or None. */
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static PyObject *
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objfpy_get_build_id (PyObject *self, void *closure)
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{
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objfile_object *obj = (objfile_object *) self;
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struct objfile *objfile = obj->objfile;
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const struct elf_build_id *build_id = NULL;
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OBJFPY_REQUIRE_VALID (obj);
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TRY
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{
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build_id = build_id_bfd_get (objfile->obfd);
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}
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CATCH (except, RETURN_MASK_ALL)
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{
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GDB_PY_HANDLE_EXCEPTION (except);
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}
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END_CATCH
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if (build_id != NULL)
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{
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char *hex_form = make_hex_string (build_id->data, build_id->size);
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PyObject *result;
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result = PyString_Decode (hex_form, strlen (hex_form),
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host_charset (), NULL);
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xfree (hex_form);
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return result;
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}
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Py_RETURN_NONE;
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}
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/* An Objfile method which returns the objfile's progspace, or None. */
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static PyObject *
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objfpy_get_progspace (PyObject *self, void *closure)
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{
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objfile_object *obj = (objfile_object *) self;
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if (obj->objfile)
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{
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PyObject *pspace = pspace_to_pspace_object (obj->objfile->pspace);
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Py_XINCREF (pspace);
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return pspace;
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}
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Py_RETURN_NONE;
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}
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static void
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objfpy_dealloc (PyObject *o)
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{
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objfile_object *self = (objfile_object *) o;
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Py_XDECREF (self->dict);
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Py_XDECREF (self->printers);
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Py_XDECREF (self->frame_filters);
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Py_XDECREF (self->type_printers);
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Py_XDECREF (self->xmethods);
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Py_TYPE (self)->tp_free (self);
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}
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/* Initialize an objfile_object.
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The result is a boolean indicating success. */
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static int
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objfpy_initialize (objfile_object *self)
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{
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self->objfile = NULL;
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self->dict = NULL;
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self->printers = PyList_New (0);
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if (self->printers == NULL)
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return 0;
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self->frame_filters = PyDict_New ();
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if (self->frame_filters == NULL)
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return 0;
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self->type_printers = PyList_New (0);
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if (self->type_printers == NULL)
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return 0;
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self->xmethods = PyList_New (0);
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if (self->xmethods == NULL)
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return 0;
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return 1;
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}
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static PyObject *
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objfpy_new (PyTypeObject *type, PyObject *args, PyObject *keywords)
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{
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objfile_object *self = (objfile_object *) type->tp_alloc (type, 0);
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if (self)
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{
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if (!objfpy_initialize (self))
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{
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Py_DECREF (self);
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return NULL;
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}
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}
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return (PyObject *) self;
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}
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PyObject *
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objfpy_get_printers (PyObject *o, void *ignore)
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{
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objfile_object *self = (objfile_object *) o;
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Py_INCREF (self->printers);
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return self->printers;
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}
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static int
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objfpy_set_printers (PyObject *o, PyObject *value, void *ignore)
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{
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PyObject *tmp;
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objfile_object *self = (objfile_object *) o;
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if (! value)
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{
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PyErr_SetString (PyExc_TypeError,
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_("Cannot delete the pretty_printers attribute."));
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return -1;
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}
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if (! PyList_Check (value))
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{
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PyErr_SetString (PyExc_TypeError,
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_("The pretty_printers attribute must be a list."));
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return -1;
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}
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/* Take care in case the LHS and RHS are related somehow. */
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tmp = self->printers;
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Py_INCREF (value);
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self->printers = value;
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Py_XDECREF (tmp);
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return 0;
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}
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/* Return the Python dictionary attribute containing frame filters for
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this object file. */
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PyObject *
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objfpy_get_frame_filters (PyObject *o, void *ignore)
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{
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objfile_object *self = (objfile_object *) o;
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Py_INCREF (self->frame_filters);
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return self->frame_filters;
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}
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/* Set this object file's frame filters dictionary to FILTERS. */
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static int
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objfpy_set_frame_filters (PyObject *o, PyObject *filters, void *ignore)
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{
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PyObject *tmp;
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objfile_object *self = (objfile_object *) o;
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if (! filters)
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{
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PyErr_SetString (PyExc_TypeError,
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_("Cannot delete the frame filters attribute."));
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return -1;
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}
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if (! PyDict_Check (filters))
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{
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PyErr_SetString (PyExc_TypeError,
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_("The frame_filters attribute must be a dictionary."));
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return -1;
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}
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/* Take care in case the LHS and RHS are related somehow. */
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tmp = self->frame_filters;
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Py_INCREF (filters);
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self->frame_filters = filters;
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Py_XDECREF (tmp);
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return 0;
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}
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/* Get the 'type_printers' attribute. */
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static PyObject *
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objfpy_get_type_printers (PyObject *o, void *ignore)
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{
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objfile_object *self = (objfile_object *) o;
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Py_INCREF (self->type_printers);
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return self->type_printers;
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}
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/* Get the 'xmethods' attribute. */
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PyObject *
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objfpy_get_xmethods (PyObject *o, void *ignore)
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{
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objfile_object *self = (objfile_object *) o;
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Py_INCREF (self->xmethods);
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return self->xmethods;
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}
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/* Set the 'type_printers' attribute. */
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static int
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objfpy_set_type_printers (PyObject *o, PyObject *value, void *ignore)
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{
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PyObject *tmp;
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objfile_object *self = (objfile_object *) o;
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if (! value)
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{
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PyErr_SetString (PyExc_TypeError,
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_("Cannot delete the type_printers attribute."));
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return -1;
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}
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if (! PyList_Check (value))
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{
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PyErr_SetString (PyExc_TypeError,
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_("The type_printers attribute must be a list."));
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return -1;
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}
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/* Take care in case the LHS and RHS are related somehow. */
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tmp = self->type_printers;
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Py_INCREF (value);
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self->type_printers = value;
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Py_XDECREF (tmp);
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return 0;
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}
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/* Implementation of gdb.Objfile.is_valid (self) -> Boolean.
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Returns True if this object file still exists in GDB. */
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static PyObject *
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objfpy_is_valid (PyObject *self, PyObject *args)
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{
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objfile_object *obj = (objfile_object *) self;
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if (! obj->objfile)
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Py_RETURN_FALSE;
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Py_RETURN_TRUE;
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}
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/* Implementation of gdb.Objfile.add_separate_debug_file (self) -> Boolean. */
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static PyObject *
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objfpy_add_separate_debug_file (PyObject *self, PyObject *args, PyObject *kw)
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{
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static char *keywords[] = { "file_name", NULL };
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objfile_object *obj = (objfile_object *) self;
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const char *file_name;
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int symfile_flags = 0;
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OBJFPY_REQUIRE_VALID (obj);
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if (!PyArg_ParseTupleAndKeywords (args, kw, "s", keywords, &file_name))
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return NULL;
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TRY
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{
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bfd *abfd = symfile_bfd_open (file_name);
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symbol_file_add_separate (abfd, file_name, symfile_flags, obj->objfile);
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}
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CATCH (except, RETURN_MASK_ALL)
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{
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GDB_PY_HANDLE_EXCEPTION (except);
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}
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END_CATCH
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Py_RETURN_NONE;
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}
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/* Subroutine of gdbpy_lookup_objfile_by_build_id to simplify it.
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Return non-zero if STRING is a potentially valid build id. */
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static int
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objfpy_build_id_ok (const char *string)
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{
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size_t i, n = strlen (string);
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if (n % 2 != 0)
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return 0;
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for (i = 0; i < n; ++i)
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{
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if (!isxdigit (string[i]))
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return 0;
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}
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return 1;
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}
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/* Subroutine of gdbpy_lookup_objfile_by_build_id to simplify it.
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Returns non-zero if BUILD_ID matches STRING.
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It is assumed that objfpy_build_id_ok (string) returns TRUE. */
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static int
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objfpy_build_id_matches (const struct elf_build_id *build_id,
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const char *string)
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{
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size_t i;
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if (strlen (string) != 2 * build_id->size)
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return 0;
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for (i = 0; i < build_id->size; ++i)
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{
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char c1 = string[i * 2], c2 = string[i * 2 + 1];
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int byte = (host_hex_value (c1) << 4) | host_hex_value (c2);
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if (byte != build_id->data[i])
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return 0;
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}
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return 1;
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}
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/* Subroutine of gdbpy_lookup_objfile to simplify it.
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Look up an objfile by its file name. */
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static struct objfile *
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objfpy_lookup_objfile_by_name (const char *name)
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{
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struct objfile *objfile;
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ALL_OBJFILES (objfile)
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{
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const char *filename;
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|
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if ((objfile->flags & OBJF_NOT_FILENAME) != 0)
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continue;
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/* Don't return separate debug files. */
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if (objfile->separate_debug_objfile_backlink != NULL)
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continue;
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filename = objfile_filename (objfile);
|
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if (filename != NULL && compare_filenames_for_search (filename, name))
|
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return objfile;
|
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if (compare_filenames_for_search (objfile->original_name, name))
|
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return objfile;
|
||
}
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|
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return NULL;
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}
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|
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/* Subroutine of gdbpy_lookup_objfile to simplify it.
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Look up an objfile by its build id. */
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static struct objfile *
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objfpy_lookup_objfile_by_build_id (const char *build_id)
|
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{
|
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struct objfile *objfile;
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|
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ALL_OBJFILES (objfile)
|
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{
|
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const struct elf_build_id *obfd_build_id;
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|
||
if (objfile->obfd == NULL)
|
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continue;
|
||
/* Don't return separate debug files. */
|
||
if (objfile->separate_debug_objfile_backlink != NULL)
|
||
continue;
|
||
obfd_build_id = build_id_bfd_get (objfile->obfd);
|
||
if (obfd_build_id == NULL)
|
||
continue;
|
||
if (objfpy_build_id_matches (obfd_build_id, build_id))
|
||
return objfile;
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Implementation of gdb.lookup_objfile. */
|
||
|
||
PyObject *
|
||
gdbpy_lookup_objfile (PyObject *self, PyObject *args, PyObject *kw)
|
||
{
|
||
static char *keywords[] = { "name", "by_build_id", NULL };
|
||
const char *name;
|
||
PyObject *by_build_id_obj = NULL;
|
||
int by_build_id;
|
||
struct objfile *objfile;
|
||
|
||
if (! PyArg_ParseTupleAndKeywords (args, kw, "s|O!", keywords,
|
||
&name, &PyBool_Type, &by_build_id_obj))
|
||
return NULL;
|
||
|
||
by_build_id = 0;
|
||
if (by_build_id_obj != NULL)
|
||
{
|
||
int cmp = PyObject_IsTrue (by_build_id_obj);
|
||
|
||
if (cmp < 0)
|
||
return NULL;
|
||
by_build_id = cmp;
|
||
}
|
||
|
||
if (by_build_id)
|
||
{
|
||
if (!objfpy_build_id_ok (name))
|
||
{
|
||
PyErr_SetString (PyExc_TypeError, _("Not a valid build id."));
|
||
return NULL;
|
||
}
|
||
objfile = objfpy_lookup_objfile_by_build_id (name);
|
||
}
|
||
else
|
||
objfile = objfpy_lookup_objfile_by_name (name);
|
||
|
||
if (objfile != NULL)
|
||
{
|
||
PyObject *result = objfile_to_objfile_object (objfile);
|
||
|
||
Py_XINCREF (result);
|
||
return result;
|
||
}
|
||
|
||
PyErr_SetString (PyExc_ValueError, _("Objfile not found."));
|
||
return NULL;
|
||
}
|
||
|
||
|
||
|
||
/* Clear the OBJFILE pointer in an Objfile object and remove the
|
||
reference. */
|
||
static void
|
||
py_free_objfile (struct objfile *objfile, void *datum)
|
||
{
|
||
struct cleanup *cleanup;
|
||
objfile_object *object = datum;
|
||
|
||
cleanup = ensure_python_env (get_objfile_arch (objfile), current_language);
|
||
object->objfile = NULL;
|
||
Py_DECREF ((PyObject *) object);
|
||
do_cleanups (cleanup);
|
||
}
|
||
|
||
/* Return a borrowed reference to the Python object of type Objfile
|
||
representing OBJFILE. If the object has already been created,
|
||
return it. Otherwise, create it. Return NULL and set the Python
|
||
error on failure. */
|
||
|
||
PyObject *
|
||
objfile_to_objfile_object (struct objfile *objfile)
|
||
{
|
||
objfile_object *object;
|
||
|
||
object = objfile_data (objfile, objfpy_objfile_data_key);
|
||
if (!object)
|
||
{
|
||
object = PyObject_New (objfile_object, &objfile_object_type);
|
||
if (object)
|
||
{
|
||
if (!objfpy_initialize (object))
|
||
{
|
||
Py_DECREF (object);
|
||
return NULL;
|
||
}
|
||
|
||
object->objfile = objfile;
|
||
set_objfile_data (objfile, objfpy_objfile_data_key, object);
|
||
}
|
||
}
|
||
|
||
return (PyObject *) object;
|
||
}
|
||
|
||
int
|
||
gdbpy_initialize_objfile (void)
|
||
{
|
||
objfpy_objfile_data_key
|
||
= register_objfile_data_with_cleanup (NULL, py_free_objfile);
|
||
|
||
if (PyType_Ready (&objfile_object_type) < 0)
|
||
return -1;
|
||
|
||
return gdb_pymodule_addobject (gdb_module, "Objfile",
|
||
(PyObject *) &objfile_object_type);
|
||
}
|
||
|
||
|
||
|
||
static PyMethodDef objfile_object_methods[] =
|
||
{
|
||
{ "is_valid", objfpy_is_valid, METH_NOARGS,
|
||
"is_valid () -> Boolean.\n\
|
||
Return true if this object file is valid, false if not." },
|
||
|
||
{ "add_separate_debug_file", (PyCFunction) objfpy_add_separate_debug_file,
|
||
METH_VARARGS | METH_KEYWORDS,
|
||
"add_separate_debug_file (file_name).\n\
|
||
Add FILE_NAME to the list of files containing debug info for the objfile." },
|
||
|
||
{ NULL }
|
||
};
|
||
|
||
static PyGetSetDef objfile_getset[] =
|
||
{
|
||
{ "__dict__", gdb_py_generic_dict, NULL,
|
||
"The __dict__ for this objfile.", &objfile_object_type },
|
||
{ "filename", objfpy_get_filename, NULL,
|
||
"The objfile's filename, or None.", NULL },
|
||
{ "username", objfpy_get_username, NULL,
|
||
"The name of the objfile as provided by the user, or None.", NULL },
|
||
{ "owner", objfpy_get_owner, NULL,
|
||
"The objfile owner of separate debug info objfiles, or None.",
|
||
NULL },
|
||
{ "build_id", objfpy_get_build_id, NULL,
|
||
"The objfile's build id, or None.", NULL },
|
||
{ "progspace", objfpy_get_progspace, NULL,
|
||
"The objfile's progspace, or None.", NULL },
|
||
{ "pretty_printers", objfpy_get_printers, objfpy_set_printers,
|
||
"Pretty printers.", NULL },
|
||
{ "frame_filters", objfpy_get_frame_filters,
|
||
objfpy_set_frame_filters, "Frame Filters.", NULL },
|
||
{ "type_printers", objfpy_get_type_printers, objfpy_set_type_printers,
|
||
"Type printers.", NULL },
|
||
{ "xmethods", objfpy_get_xmethods, NULL,
|
||
"Debug methods.", NULL },
|
||
{ NULL }
|
||
};
|
||
|
||
PyTypeObject objfile_object_type =
|
||
{
|
||
PyVarObject_HEAD_INIT (NULL, 0)
|
||
"gdb.Objfile", /*tp_name*/
|
||
sizeof (objfile_object), /*tp_basicsize*/
|
||
0, /*tp_itemsize*/
|
||
objfpy_dealloc, /*tp_dealloc*/
|
||
0, /*tp_print*/
|
||
0, /*tp_getattr*/
|
||
0, /*tp_setattr*/
|
||
0, /*tp_compare*/
|
||
0, /*tp_repr*/
|
||
0, /*tp_as_number*/
|
||
0, /*tp_as_sequence*/
|
||
0, /*tp_as_mapping*/
|
||
0, /*tp_hash */
|
||
0, /*tp_call*/
|
||
0, /*tp_str*/
|
||
0, /*tp_getattro*/
|
||
0, /*tp_setattro*/
|
||
0, /*tp_as_buffer*/
|
||
Py_TPFLAGS_DEFAULT, /*tp_flags*/
|
||
"GDB objfile object", /* tp_doc */
|
||
0, /* tp_traverse */
|
||
0, /* tp_clear */
|
||
0, /* tp_richcompare */
|
||
0, /* tp_weaklistoffset */
|
||
0, /* tp_iter */
|
||
0, /* tp_iternext */
|
||
objfile_object_methods, /* tp_methods */
|
||
0, /* tp_members */
|
||
objfile_getset, /* tp_getset */
|
||
0, /* tp_base */
|
||
0, /* tp_dict */
|
||
0, /* tp_descr_get */
|
||
0, /* tp_descr_set */
|
||
offsetof (objfile_object, dict), /* tp_dictoffset */
|
||
0, /* tp_init */
|
||
0, /* tp_alloc */
|
||
objfpy_new, /* tp_new */
|
||
};
|