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/* Python interface to symbols.

   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 "exceptions.h"

#include "frame.h"

#include "symtab.h"

#include "python-internal.h"

#include "objfiles.h"

typedef struct sympy_symbol_object {

  PyObject_HEAD

  /* The GDB symbol structure this object is wrapping.  */

  struct symbol *symbol;

  /* A symbol object is associated with an objfile, so keep track with

     doubly-linked list, rooted in the objfile.  This lets us

     invalidate the underlying struct symbol when the objfile is

     deleted.  */

  struct sympy_symbol_object *prev;

  struct sympy_symbol_object *next;

} symbol_object;

/* Require a valid symbol.  All access to symbol_object->symbol should be

   gated by this call.  */

#define SYMPY_REQUIRE_VALID(symbol_obj, symbol)         \

  do {                                                  \

    symbol = symbol_object_to_symbol (symbol_obj);      \

    if (symbol == NULL)                                 \

      {                                                 \

        PyErr_SetString (PyExc_RuntimeError,            \

                         _("Symbol is invalid."));      \

        return NULL;                                    \

      }                                                 \

  } while (0)

static const struct objfile_data *sympy_objfile_data_key;

static PyObject *

sympy_str (PyObject *self)

{

  PyObject *result;

  struct symbol *symbol = NULL;

  SYMPY_REQUIRE_VALID (self, symbol);

  result = PyString_FromString (SYMBOL_PRINT_NAME (symbol));

  return result;

}

static PyObject *

sympy_get_symtab (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  SYMPY_REQUIRE_VALID (self, symbol);

  return symtab_to_symtab_object (SYMBOL_SYMTAB (symbol));

}

static PyObject *

sympy_get_name (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  SYMPY_REQUIRE_VALID (self, symbol);

  return PyString_FromString (SYMBOL_NATURAL_NAME (symbol));

}

static PyObject *

sympy_get_linkage_name (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  SYMPY_REQUIRE_VALID (self, symbol);

  return PyString_FromString (SYMBOL_LINKAGE_NAME (symbol));

}

static PyObject *

sympy_get_print_name (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  SYMPY_REQUIRE_VALID (self, symbol);

  return sympy_str (self);

}

static PyObject *

sympy_get_addr_class (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  SYMPY_REQUIRE_VALID (self, symbol);

  return PyInt_FromLong (SYMBOL_CLASS (symbol));

}

static PyObject *

sympy_is_argument (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  SYMPY_REQUIRE_VALID (self, symbol);

  return PyBool_FromLong (SYMBOL_IS_ARGUMENT (symbol));

}

static PyObject *

sympy_is_constant (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  enum address_class class;

  SYMPY_REQUIRE_VALID (self, symbol);

  class = SYMBOL_CLASS (symbol);

  return PyBool_FromLong (class == LOC_CONST || class == LOC_CONST_BYTES);

}

static PyObject *

sympy_is_function (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  enum address_class class;

  SYMPY_REQUIRE_VALID (self, symbol);

  class = SYMBOL_CLASS (symbol);

  return PyBool_FromLong (class == LOC_BLOCK);

}

static PyObject *

sympy_is_variable (PyObject *self, void *closure)

{

  struct symbol *symbol = NULL;

  enum address_class class;

  SYMPY_REQUIRE_VALID (self, symbol);

  class = SYMBOL_CLASS (symbol);

  return PyBool_FromLong (!SYMBOL_IS_ARGUMENT (symbol)

                          && (class == LOC_LOCAL || class == LOC_REGISTER

                              || class == LOC_STATIC || class == LOC_COMPUTED

                              || class == LOC_OPTIMIZED_OUT));

}

/* Given a symbol, and a symbol_object that has previously been

   allocated and initialized, populate the symbol_object with the

   struct symbol data.  Also, register the symbol_object life-cycle

   with the life-cycle of the the object file associated with this

   symbol, if needed.  */

static void

set_symbol (symbol_object *obj, struct symbol *symbol)

{

  obj->symbol = symbol;

  obj->prev = NULL;

  if (SYMBOL_SYMTAB (symbol))

    {

      obj->next = objfile_data (SYMBOL_SYMTAB (symbol)->objfile,

                                sympy_objfile_data_key);

      if (obj->next)

        obj->next->prev = obj;

      set_objfile_data (SYMBOL_SYMTAB (symbol)->objfile,

                        sympy_objfile_data_key, obj);

    }

  else

    obj->next = NULL;

}

/* Create a new symbol object (gdb.Symbol) that encapsulates the struct

   symbol object from GDB.  */

PyObject *

symbol_to_symbol_object (struct symbol *sym)

{

  symbol_object *sym_obj;

  sym_obj = PyObject_New (symbol_object, &symbol_object_type);

  if (sym_obj)

    set_symbol (sym_obj, sym);

  return (PyObject *) sym_obj;

}

/* Return the symbol that is wrapped by this symbol object.  */

struct symbol *

symbol_object_to_symbol (PyObject *obj)

{

  if (! PyObject_TypeCheck (obj, &symbol_object_type))

    return NULL;

  return ((symbol_object *) obj)->symbol;

}

static void

sympy_dealloc (PyObject *obj)

{

  symbol_object *sym_obj = (symbol_object *) obj;

  if (sym_obj->prev)

    sym_obj->prev->next = sym_obj->next;

  else if (SYMBOL_SYMTAB (sym_obj->symbol))

    {

      set_objfile_data (SYMBOL_SYMTAB (sym_obj->symbol)->objfile,

                        sympy_objfile_data_key, sym_obj->next);

    }

  if (sym_obj->next)

    sym_obj->next->prev = sym_obj->prev;

  sym_obj->symbol = NULL;

}

/* Implementation of

   gdb.lookup_symbol (name [, block] [, domain]) -> (symbol, is_field_of_this)

   A tuple with 2 elements is always returned.  The first is the symbol

   object or None, the second is a boolean with the value of

   is_a_field_of_this (see comment in lookup_symbol_in_language).  */

PyObject *

gdbpy_lookup_symbol (PyObject *self, PyObject *args, PyObject *kw)

{

  int domain = VAR_DOMAIN, is_a_field_of_this = 0;

  const char *name;

  static char *keywords[] = { "name", "block", "domain", NULL };

  struct symbol *symbol;

  PyObject *block_obj = NULL, *ret_tuple, *sym_obj, *bool_obj;

  struct block *block = NULL;

  if (! PyArg_ParseTupleAndKeywords (args, kw, "s|O!i", keywords, &name,

                                     &block_object_type, &block_obj, &domain))

    return NULL;

  if (block_obj)

    block = block_object_to_block (block_obj);

  else

    {

      struct frame_info *selected_frame;

      volatile struct gdb_exception except;

      TRY_CATCH (except, RETURN_MASK_ALL)

        {

          selected_frame  = get_selected_frame (_("No frame selected."));

          block = block_for_pc (get_frame_address_in_block (selected_frame));

        }

      GDB_PY_HANDLE_EXCEPTION (except);

    }

  symbol = lookup_symbol (name, block, domain, &is_a_field_of_this);

  ret_tuple = PyTuple_New (2);

  if (!ret_tuple)

    return NULL;

  if (symbol)

    {

      sym_obj = symbol_to_symbol_object (symbol);

      if (!sym_obj)

        {

          Py_DECREF (ret_tuple);

          return NULL;

        }

    }

  else

    {

      sym_obj = Py_None;

      Py_INCREF (Py_None);

    }

  PyTuple_SET_ITEM (ret_tuple, 0, sym_obj);

  bool_obj = is_a_field_of_this? Py_True : Py_False;

  Py_INCREF (bool_obj);

  PyTuple_SET_ITEM (ret_tuple, 1, bool_obj);

  return ret_tuple;

}

/* This function is called when an objfile is about to be freed.

   Invalidate the symbol as further actions on the symbol would result

   in bad data.  All access to obj->symbol should be gated by

   SYMPY_REQUIRE_VALID which will raise an exception on invalid

   symbols.  */

static void

del_objfile_symbols (struct objfile *objfile, void *datum)

{

  symbol_object *obj = datum;

  while (obj)

    {

      symbol_object *next = obj->next;

      obj->symbol = NULL;

      obj->next = NULL;

      obj->prev = NULL;

      obj = next;

    }

}

void

gdbpy_initialize_symbols (void)

{

  if (PyType_Ready (&symbol_object_type) < 0)

    return;

  /* Register an objfile "free" callback so we can properly

     invalidate symbol when an object file that is about to be

     deleted.  */

  sympy_objfile_data_key

    = register_objfile_data_with_cleanup (NULL, del_objfile_symbols);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_UNDEF", LOC_UNDEF);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_CONST", LOC_CONST);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_STATIC", LOC_STATIC);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_REGISTER", LOC_REGISTER);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_ARG", LOC_ARG);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_REF_ARG", LOC_REF_ARG);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_LOCAL", LOC_LOCAL);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_TYPEDEF", LOC_TYPEDEF);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_LABEL", LOC_LABEL);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_BLOCK", LOC_BLOCK);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_CONST_BYTES",

                           LOC_CONST_BYTES);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_UNRESOLVED", LOC_UNRESOLVED);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_OPTIMIZED_OUT",

                           LOC_OPTIMIZED_OUT);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_COMPUTED", LOC_COMPUTED);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LOC_REGPARM_ADDR",

                           LOC_REGPARM_ADDR);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_UNDEF_DOMAIN", UNDEF_DOMAIN);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_VAR_DOMAIN", VAR_DOMAIN);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_STRUCT_DOMAIN", STRUCT_DOMAIN);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_LABEL_DOMAIN", LABEL_DOMAIN);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_VARIABLES_DOMAIN",

                           VARIABLES_DOMAIN);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_FUNCTIONS_DOMAIN",

                           FUNCTIONS_DOMAIN);

  PyModule_AddIntConstant (gdb_module, "SYMBOL_TYPES_DOMAIN", TYPES_DOMAIN);

  Py_INCREF (&symbol_object_type);

  PyModule_AddObject (gdb_module, "Symbol", (PyObject *) &symbol_object_type);

}

static PyGetSetDef symbol_object_getset[] = {

  { "symtab", sympy_get_symtab, NULL,

    "Symbol table in which the symbol appears.", NULL },

  { "name", sympy_get_name, NULL,

    "Name of the symbol, as it appears in the source code.", NULL },

  { "linkage_name", sympy_get_linkage_name, NULL,

    "Name of the symbol, as used by the linker (i.e., may be mangled).", NULL },

  { "print_name", sympy_get_print_name, NULL,

    "Name of the symbol in a form suitable for output.\n\

This is either name or linkage_name, depending on whether the user asked GDB\n\

to display demangled or mangled names.", NULL },

  { "addr_class", sympy_get_addr_class, NULL, "Address class of the symbol." },

  { "is_argument", sympy_is_argument, NULL,

    "True if the symbol is an argument of a function." },

  { "is_constant", sympy_is_constant, NULL,

    "True if the symbol is a constant." },

  { "is_function", sympy_is_function, NULL,

    "True if the symbol is a function or method." },

  { "is_variable", sympy_is_variable, NULL,

    "True if the symbol is a variable." },

  { NULL }  /* Sentinel */

};

PyTypeObject symbol_object_type = {

  PyObject_HEAD_INIT (NULL)

  0,                               /*ob_size*/

  "gdb.Symbol",                   /*tp_name*/

  sizeof (symbol_object),         /*tp_basicsize*/

  0,                               /*tp_itemsize*/

  sympy_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*/

  sympy_str,                      /*tp_str*/

  0,                               /*tp_getattro*/

  0,                               /*tp_setattro*/

  0,                               /*tp_as_buffer*/

  Py_TPFLAGS_DEFAULT,             /*tp_flags*/

  "GDB symbol object",            /*tp_doc */

  0,                               /*tp_traverse */

  0,                               /*tp_clear */

  0,                               /*tp_richcompare */

  0,                               /*tp_weaklistoffset */

  0,                               /*tp_iter */

  0,                               /*tp_iternext */

  0,                               /*tp_methods */

  0,                               /*tp_members */

  symbol_object_getset            /*tp_getset */

};