420 lines
11 KiB
C
420 lines
11 KiB
C
/* Python interface to blocks.
|
||
|
||
Copyright (C) 2008, 2009, 2010 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 "block.h"
|
||
#include "dictionary.h"
|
||
#include "symtab.h"
|
||
#include "python-internal.h"
|
||
#include "objfiles.h"
|
||
#include "symtab.h"
|
||
|
||
typedef struct blpy_block_object {
|
||
PyObject_HEAD
|
||
/* The GDB block structure that represents a frame's code block. */
|
||
struct block *block;
|
||
/* The backing object file. There is no direct relationship in GDB
|
||
between a block and an object file. When a block is created also
|
||
store a pointer to the object file for later use. */
|
||
struct objfile *objfile;
|
||
/* Keep track of all blocks with a doubly-linked list. Needed for
|
||
block invalidation if the source object file has been freed. */
|
||
struct blpy_block_object *prev;
|
||
struct blpy_block_object *next;
|
||
} block_object;
|
||
|
||
typedef struct {
|
||
PyObject_HEAD
|
||
/* The block dictionary of symbols. */
|
||
struct dictionary *dict;
|
||
/* The iterator for that dictionary. */
|
||
struct dict_iterator iter;
|
||
/* Has the iterator been initialized flag. */
|
||
int initialized_p;
|
||
/* Pointer back to the original source block object. Needed to
|
||
check if the block is still valid, and has not been invalidated
|
||
when an object file has been freed. */
|
||
struct blpy_block_object *source;
|
||
} block_syms_iterator_object;
|
||
|
||
/* Require a valid block. All access to block_object->block should be
|
||
gated by this call. */
|
||
#define BLPY_REQUIRE_VALID(block_obj, block) \
|
||
do { \
|
||
block = block_object_to_block (block_obj); \
|
||
if (block == NULL) \
|
||
{ \
|
||
PyErr_SetString (PyExc_RuntimeError, \
|
||
_("Block is invalid.")); \
|
||
return NULL; \
|
||
} \
|
||
} while (0)
|
||
|
||
/* Require a valid block. This macro is called during block iterator
|
||
creation, and at each next call. */
|
||
#define BLPY_ITER_REQUIRE_VALID(block_obj) \
|
||
do { \
|
||
if (block_obj->block == NULL) \
|
||
{ \
|
||
PyErr_SetString (PyExc_RuntimeError, \
|
||
_("Source block for iterator is invalid.")); \
|
||
return NULL; \
|
||
} \
|
||
} while (0)
|
||
|
||
static PyTypeObject block_syms_iterator_object_type;
|
||
static const struct objfile_data *blpy_objfile_data_key;
|
||
|
||
static PyObject *
|
||
blpy_iter (PyObject *self)
|
||
{
|
||
block_syms_iterator_object *block_iter_obj;
|
||
struct block *block = NULL;
|
||
|
||
BLPY_REQUIRE_VALID (self, block);
|
||
|
||
block_iter_obj = PyObject_New (block_syms_iterator_object,
|
||
&block_syms_iterator_object_type);
|
||
if (block_iter_obj == NULL)
|
||
return NULL;
|
||
|
||
block_iter_obj->dict = BLOCK_DICT (block);
|
||
block_iter_obj->initialized_p = 0;
|
||
Py_INCREF (self);
|
||
block_iter_obj->source = (block_object *) self;
|
||
|
||
return (PyObject *) block_iter_obj;
|
||
}
|
||
|
||
static PyObject *
|
||
blpy_get_start (PyObject *self, void *closure)
|
||
{
|
||
struct block *block = NULL;
|
||
|
||
BLPY_REQUIRE_VALID (self, block);
|
||
|
||
return PyLong_FromUnsignedLongLong (BLOCK_START (block));
|
||
}
|
||
|
||
static PyObject *
|
||
blpy_get_end (PyObject *self, void *closure)
|
||
{
|
||
struct block *block = NULL;
|
||
|
||
BLPY_REQUIRE_VALID (self, block);
|
||
|
||
return PyLong_FromUnsignedLongLong (BLOCK_END (block));
|
||
}
|
||
|
||
static PyObject *
|
||
blpy_get_function (PyObject *self, void *closure)
|
||
{
|
||
struct symbol *sym;
|
||
struct block *block = NULL;
|
||
|
||
BLPY_REQUIRE_VALID (self, block);
|
||
|
||
sym = BLOCK_FUNCTION (block);
|
||
if (sym)
|
||
return symbol_to_symbol_object (sym);
|
||
|
||
Py_RETURN_NONE;
|
||
}
|
||
|
||
static PyObject *
|
||
blpy_get_superblock (PyObject *self, void *closure)
|
||
{
|
||
struct block *block = NULL;
|
||
struct block *super_block = NULL;
|
||
block_object *self_obj = (block_object *) self;
|
||
|
||
BLPY_REQUIRE_VALID (self, block);
|
||
|
||
super_block = BLOCK_SUPERBLOCK (block);
|
||
if (super_block)
|
||
return block_to_block_object (super_block, self_obj->objfile);
|
||
|
||
Py_RETURN_NONE;
|
||
}
|
||
|
||
static void
|
||
blpy_dealloc (PyObject *obj)
|
||
{
|
||
block_object *block = (block_object *) obj;
|
||
|
||
if (block->prev)
|
||
block->prev->next = block->next;
|
||
else if (block->objfile)
|
||
{
|
||
set_objfile_data (block->objfile, blpy_objfile_data_key,
|
||
block->next);
|
||
}
|
||
if (block->next)
|
||
block->next->prev = block->prev;
|
||
block->block = NULL;
|
||
}
|
||
|
||
/* Given a block, and a block_object that has previously been
|
||
allocated and initialized, populate the block_object with the
|
||
struct block data. Also, register the block_object life-cycle
|
||
with the life-cycle of the the object file associated with this
|
||
block, if needed. */
|
||
static void
|
||
set_block (block_object *obj, struct block *block,
|
||
struct objfile *objfile)
|
||
{
|
||
obj->block = block;
|
||
obj->prev = NULL;
|
||
if (objfile)
|
||
{
|
||
obj->objfile = objfile;
|
||
obj->next = objfile_data (objfile, blpy_objfile_data_key);
|
||
if (obj->next)
|
||
obj->next->prev = obj;
|
||
set_objfile_data (objfile, blpy_objfile_data_key, obj);
|
||
}
|
||
else
|
||
obj->next = NULL;
|
||
}
|
||
|
||
/* Create a new block object (gdb.Block) that encapsulates the struct
|
||
block object from GDB. */
|
||
PyObject *
|
||
block_to_block_object (struct block *block, struct objfile *objfile)
|
||
{
|
||
block_object *block_obj;
|
||
|
||
block_obj = PyObject_New (block_object, &block_object_type);
|
||
if (block_obj)
|
||
set_block (block_obj, block, objfile);
|
||
|
||
return (PyObject *) block_obj;
|
||
}
|
||
|
||
/* Return struct block reference that is wrapped by this object. */
|
||
struct block *
|
||
block_object_to_block (PyObject *obj)
|
||
{
|
||
if (! PyObject_TypeCheck (obj, &block_object_type))
|
||
return NULL;
|
||
return ((block_object *) obj)->block;
|
||
}
|
||
|
||
/* Return a reference to the block iterator. */
|
||
static PyObject *
|
||
blpy_block_syms_iter (PyObject *self)
|
||
{
|
||
block_syms_iterator_object *iter_obj = (block_syms_iterator_object *) self;
|
||
|
||
BLPY_ITER_REQUIRE_VALID (iter_obj->source);
|
||
|
||
Py_INCREF (self);
|
||
return self;
|
||
}
|
||
|
||
/* Return the next symbol in the iteration through the block's
|
||
dictionary. */
|
||
static PyObject *
|
||
blpy_block_syms_iternext (PyObject *self)
|
||
{
|
||
block_syms_iterator_object *iter_obj = (block_syms_iterator_object *) self;
|
||
struct symbol *sym;
|
||
|
||
BLPY_ITER_REQUIRE_VALID (iter_obj->source);
|
||
|
||
if (!iter_obj->initialized_p)
|
||
{
|
||
sym = dict_iterator_first (iter_obj->dict, &(iter_obj->iter));
|
||
iter_obj->initialized_p = 1;
|
||
}
|
||
else
|
||
sym = dict_iterator_next (&(iter_obj->iter));
|
||
|
||
if (sym == NULL)
|
||
{
|
||
PyErr_SetString (PyExc_StopIteration, _("Symbol is null."));
|
||
return NULL;
|
||
}
|
||
|
||
return symbol_to_symbol_object (sym);
|
||
}
|
||
|
||
static void
|
||
blpy_block_syms_dealloc (PyObject *obj)
|
||
{
|
||
block_syms_iterator_object *iter_obj = (block_syms_iterator_object *) obj;
|
||
|
||
Py_XDECREF (iter_obj->source);
|
||
}
|
||
|
||
/* Return the innermost lexical block containing the specified pc value,
|
||
or 0 if there is none. */
|
||
PyObject *
|
||
gdbpy_block_for_pc (PyObject *self, PyObject *args)
|
||
{
|
||
unsigned PY_LONG_LONG pc;
|
||
struct block *block;
|
||
struct obj_section *section;
|
||
struct symtab *symtab;
|
||
|
||
if (!PyArg_ParseTuple (args, "K", &pc))
|
||
return NULL;
|
||
|
||
section = find_pc_mapped_section (pc);
|
||
symtab = find_pc_sect_symtab (pc, section);
|
||
if (!symtab || symtab->objfile == NULL)
|
||
{
|
||
PyErr_SetString (PyExc_RuntimeError,
|
||
_("Cannot locate object file for block."));
|
||
return NULL;
|
||
}
|
||
|
||
block = block_for_pc (pc);
|
||
if (block)
|
||
return block_to_block_object (block, symtab->objfile);
|
||
|
||
Py_RETURN_NONE;
|
||
}
|
||
|
||
/* This function is called when an objfile is about to be freed.
|
||
Invalidate the block as further actions on the block would result
|
||
in bad data. All access to obj->symbol should be gated by
|
||
BLPY_REQUIRE_VALID which will raise an exception on invalid
|
||
blocks. */
|
||
static void
|
||
del_objfile_blocks (struct objfile *objfile, void *datum)
|
||
{
|
||
block_object *obj = datum;
|
||
|
||
while (obj)
|
||
{
|
||
block_object *next = obj->next;
|
||
|
||
obj->block = NULL;
|
||
obj->objfile = NULL;
|
||
obj->next = NULL;
|
||
obj->prev = NULL;
|
||
|
||
obj = next;
|
||
}
|
||
}
|
||
|
||
void
|
||
gdbpy_initialize_blocks (void)
|
||
{
|
||
block_object_type.tp_new = PyType_GenericNew;
|
||
if (PyType_Ready (&block_object_type) < 0)
|
||
return;
|
||
|
||
block_syms_iterator_object_type.tp_new = PyType_GenericNew;
|
||
if (PyType_Ready (&block_syms_iterator_object_type) < 0)
|
||
return;
|
||
|
||
/* Register an objfile "free" callback so we can properly
|
||
invalidate blocks when an object file is about to be
|
||
deleted. */
|
||
blpy_objfile_data_key
|
||
= register_objfile_data_with_cleanup (NULL, del_objfile_blocks);
|
||
|
||
Py_INCREF (&block_object_type);
|
||
PyModule_AddObject (gdb_module, "Block", (PyObject *) &block_object_type);
|
||
|
||
Py_INCREF (&block_syms_iterator_object_type);
|
||
PyModule_AddObject (gdb_module, "BlockIterator",
|
||
(PyObject *) &block_syms_iterator_object_type);
|
||
}
|
||
|
||
|
||
|
||
static PyGetSetDef block_object_getset[] = {
|
||
{ "start", blpy_get_start, NULL, "Start address of the block.", NULL },
|
||
{ "end", blpy_get_end, NULL, "End address of the block.", NULL },
|
||
{ "function", blpy_get_function, NULL,
|
||
"Symbol that names the block, or None.", NULL },
|
||
{ "superblock", blpy_get_superblock, NULL,
|
||
"Block containing the block, or None.", NULL },
|
||
{ NULL } /* Sentinel */
|
||
};
|
||
|
||
PyTypeObject block_object_type = {
|
||
PyObject_HEAD_INIT (NULL)
|
||
0, /*ob_size*/
|
||
"gdb.Block", /*tp_name*/
|
||
sizeof (block_object), /*tp_basicsize*/
|
||
0, /*tp_itemsize*/
|
||
blpy_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 | Py_TPFLAGS_HAVE_ITER, /*tp_flags*/
|
||
"GDB block object", /* tp_doc */
|
||
0, /* tp_traverse */
|
||
0, /* tp_clear */
|
||
0, /* tp_richcompare */
|
||
0, /* tp_weaklistoffset */
|
||
blpy_iter, /* tp_iter */
|
||
0, /* tp_iternext */
|
||
0, /* tp_methods */
|
||
0, /* tp_members */
|
||
block_object_getset /* tp_getset */
|
||
};
|
||
|
||
static PyTypeObject block_syms_iterator_object_type = {
|
||
PyObject_HEAD_INIT (NULL)
|
||
0, /*ob_size*/
|
||
"gdb.BlockIterator", /*tp_name*/
|
||
sizeof (block_syms_iterator_object), /*tp_basicsize*/
|
||
0, /*tp_itemsize*/
|
||
blpy_block_syms_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 | Py_TPFLAGS_HAVE_ITER, /*tp_flags*/
|
||
"GDB block syms iterator object", /*tp_doc */
|
||
0, /*tp_traverse */
|
||
0, /*tp_clear */
|
||
0, /*tp_richcompare */
|
||
0, /*tp_weaklistoffset */
|
||
blpy_block_syms_iter, /*tp_iter */
|
||
blpy_block_syms_iternext, /*tp_iternext */
|
||
0 /*tp_methods */
|
||
};
|