2011-03-17 Phil Muldoon <pmuldoon@redhat.com>

	    * python/py-symtab.c: Populate symtab_object_methods,
	    sal_object_methods.
	    (stpy_is_valid): New function.
	    (salpy_is_valid): Ditto.
	    * python/py-symbol.c: Declare symbol_object_methods.
	    Populate.
	    (sympy_is_valid): New function.
	    * python/py-objfile.c: Declare objfile_object_methods.
	    Populate.
	    (objfpy_is_valid): New function.
	    * python/py-inferior.c: Populate inferior_object_methods.
	    (infpy_is_valid): New function.
	    * python/py-infthread.c: Populate thread_object_methods.
	    (thpy_is_valid): New function.
	    * python/py-block.c: Declare block_object_methods.
	    Populate.  Declare
	    block_iterator_object_methods.  Populate.
	    (blpy_is_valid): New function.
	    (blpy_iter_is_valid): Ditto.

2010-03-17  Phil Muldoon  <pmuldoon@redhat.com>

	    * gdb.python/Makefile.in: Add py-objfile.
	    * gdb.python/py-objfile.exp: New file.
	    * gdb.python/py-objfile.c: New file.
	    * gdb.python/py-block.exp: Add is_valid tests.
	    * gdb.python/py-inferior.exp: Ditto.
	    * gdb.python/py-infthread.exp: Ditto.
	    * gdb.python/py-symbol.exp: Ditto.
	    * gdb.python/py-symtab.exp: Ditto.

2011-03-17  Phil Muldoon  <pmuldoon@redhat.com>

	    * gdb.texinfo (Blocks In Python): Add is_valid method
              description.
	      (Inferiors In Python): Likewise.
	      (Threads In Python): Likewise.
	      (Symbols In Python): Likewise.
	      (Objfiles In Python): Likewise.
	      (Symbol Tables In Python): Likewise.

6 files changed, 167 insertions, 5 deletions

diff --git a/gdb/python/py-block.c b/gdb/python/py-block.c
index 9d0d6cc..08d4455 100644
--- a/gdb/python/py-block.c
+++ b/gdb/python/py-block.c
@@ -263,6 +263,36 @@ blpy_block_syms_dealloc (PyObject *obj)
   Py_XDECREF (iter_obj->source);
 }
 
+/* Implementation of gdb.Block.is_valid (self) -> Boolean.
+   Returns True if this block object still exists in GDB.  */
+
+static PyObject *
+blpy_is_valid (PyObject *self, PyObject *args)
+{
+  struct block *block;
+
+  block = block_object_to_block (self);
+  if (block == NULL)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
+
+/* Implementation of gdb.BlockIterator.is_valid (self) -> Boolean.
+   Returns True if this block iterator object still exists in GDB  */
+
+static PyObject *
+blpy_iter_is_valid (PyObject *self, PyObject *args)
+{
+  block_syms_iterator_object *iter_obj =
+    (block_syms_iterator_object *) self;
+
+  if (iter_obj->source->block == NULL)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
+
 /* Return the innermost lexical block containing the specified pc value,
    or 0 if there is none.  */
 PyObject *
@@ -342,6 +372,13 @@ gdbpy_initialize_blocks (void)
 
 
 
+static PyMethodDef block_object_methods[] = {
+  { "is_valid", blpy_is_valid, METH_NOARGS,
+    "is_valid () -> Boolean.\n\
+Return true if this block is valid, false if not." },
+  {NULL}  /* Sentinel */
+};
+
 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 },
@@ -381,11 +418,18 @@ PyTypeObject block_object_type = {
   0,				  /* tp_weaklistoffset */
   blpy_iter,			  /* tp_iter */
   0,				  /* tp_iternext */
-  0,				  /* tp_methods */
+  block_object_methods,		  /* tp_methods */
   0,				  /* tp_members */
   block_object_getset		  /* tp_getset */
 };
 
+static PyMethodDef block_iterator_object_methods[] = {
+  { "is_valid", blpy_iter_is_valid, METH_NOARGS,
+    "is_valid () -> Boolean.\n\
+Return true if this block iterator is valid, false if not." },
+  {NULL}  /* Sentinel */
+};
+
 static PyTypeObject block_syms_iterator_object_type = {
   PyObject_HEAD_INIT (NULL)
   0,				  /*ob_size*/
@@ -415,5 +459,5 @@ static PyTypeObject block_syms_iterator_object_type = {
   0,				  /*tp_weaklistoffset */
   blpy_block_syms_iter,           /*tp_iter */
   blpy_block_syms_iternext,	  /*tp_iternext */
-  0				  /*tp_methods */
+  block_iterator_object_methods   /*tp_methods */
 };
diff --git a/gdb/python/py-inferior.c b/gdb/python/py-inferior.c
index ee41ea7..b9df394 100644
--- a/gdb/python/py-inferior.c
+++ b/gdb/python/py-inferior.c
@@ -606,6 +606,20 @@ infpy_search_memory (PyObject *self, PyObject *args, PyObject *kw)
     Py_RETURN_NONE;
 }
 
+/* Implementation of gdb.Inferior.is_valid (self) -> Boolean.
+   Returns True if this inferior object still exists in GDB.  */
+
+static PyObject *
+infpy_is_valid (PyObject *self, PyObject *args)
+{
+  inferior_object *inf = (inferior_object *) self;
+
+  if (! inf->inferior)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
+
 
 /* Clear the INFERIOR pointer in an Inferior object and clear the
    thread list.  */
@@ -676,6 +690,9 @@ static PyGetSetDef inferior_object_getset[] =
 
 static PyMethodDef inferior_object_methods[] =
 {
+  { "is_valid", infpy_is_valid, METH_NOARGS,
+    "is_valid () -> Boolean.\n\
+Return true if this inferior is valid, false if not." },
   { "threads", infpy_threads, METH_NOARGS,
     "Return all the threads of this inferior." },
   { "read_memory", (PyCFunction) infpy_read_memory,
diff --git a/gdb/python/py-infthread.c b/gdb/python/py-infthread.c
index 059422d..b37c53c 100644
--- a/gdb/python/py-infthread.c
+++ b/gdb/python/py-infthread.c
@@ -222,7 +222,20 @@ thpy_is_exited (PyObject *self, PyObject *args)
   Py_RETURN_FALSE;
 }
 
+/* Implementation of gdb.InfThread.is_valid (self) -> Boolean.
+   Returns True if this inferior Thread object still exists
+   in GDB.  */
 
+static PyObject *
+thpy_is_valid (PyObject *self, PyObject *args)
+{
+  thread_object *thread_obj = (thread_object *) self;
+
+  if (! thread_obj->thread)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
 
 /* Implementation of gdb.selected_thread () -> gdb.InferiorThread.
    Returns the selected thread object.  */
@@ -269,6 +282,9 @@ static PyGetSetDef thread_object_getset[] =
 
 static PyMethodDef thread_object_methods[] =
 {
+  { "is_valid", thpy_is_valid, METH_NOARGS,
+    "is_valid () -> Boolean.\n\
+Return true if this inferior thread is valid, false if not." },
   { "switch", thpy_switch, METH_NOARGS,
     "switch ()\n\
 Makes this the GDB selected thread." },
diff --git a/gdb/python/py-objfile.c b/gdb/python/py-objfile.c
index 7f9d9ee..f9821f5 100644
--- a/gdb/python/py-objfile.c
+++ b/gdb/python/py-objfile.c
@@ -118,6 +118,20 @@ objfpy_set_printers (PyObject *o, PyObject *value, void *ignore)
   return 0;
 }
 
+/* Implementation of gdb.Objfile.is_valid (self) -> Boolean.
+   Returns True if this object file still exists in GDB.  */
+
+static PyObject *
+objfpy_is_valid (PyObject *self, PyObject *args)
+{
+  objfile_object *obj = (objfile_object *) self;
+
+  if (! obj->objfile)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
+
 
 
 /* Clear the OBJFILE pointer in an Objfile object and remove the
@@ -181,6 +195,15 @@ gdbpy_initialize_objfile (void)
 
 
 
+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." },
+
+  { NULL }
+};
+
 static PyGetSetDef objfile_getset[] =
 {
   { "filename", objfpy_get_filename, NULL,
@@ -220,7 +243,7 @@ static PyTypeObject objfile_object_type =
   0,				  /* tp_weaklistoffset */
   0,				  /* tp_iter */
   0,				  /* tp_iternext */
-  0,				  /* tp_methods */
+  objfile_object_methods,	  /* tp_methods */
   0,				  /* tp_members */
   objfile_getset,		  /* tp_getset */
   0,				  /* tp_base */
diff --git a/gdb/python/py-symbol.c b/gdb/python/py-symbol.c
index 2df2336..2c7900f 100644
--- a/gdb/python/py-symbol.c
+++ b/gdb/python/py-symbol.c
@@ -167,6 +167,21 @@ sympy_is_variable (PyObject *self, void *closure)
 			      || class == LOC_OPTIMIZED_OUT));
 }
 
+/* Implementation of gdb.Symbol.is_valid (self) -> Boolean.
+   Returns True if this Symbol still exists in GDB.  */
+
+static PyObject *
+sympy_is_valid (PyObject *self, PyObject *args)
+{
+  struct symbol *symbol = NULL;
+
+  symbol = symbol_object_to_symbol (self);
+  if (symbol == NULL)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
+
 /* 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
@@ -420,6 +435,13 @@ to display demangled or mangled names.", NULL },
   { NULL }  /* Sentinel */
 };
 
+static PyMethodDef symbol_object_methods[] = {
+  { "is_valid", sympy_is_valid, METH_NOARGS,
+    "is_valid () -> Boolean.\n\
+Return true if this symbol is valid, false if not." },
+  {NULL}  /* Sentinel */
+};
+
 PyTypeObject symbol_object_type = {
   PyObject_HEAD_INIT (NULL)
   0,				  /*ob_size*/
@@ -449,7 +471,7 @@ PyTypeObject symbol_object_type = {
   0,				  /*tp_weaklistoffset */
   0,				  /*tp_iter */
   0,				  /*tp_iternext */
-  0,				  /*tp_methods */
+  symbol_object_methods,	  /*tp_methods */
   0,				  /*tp_members */
   symbol_object_getset		  /*tp_getset */
 };
diff --git a/gdb/python/py-symtab.c b/gdb/python/py-symtab.c
index 5c1c6bb..107cdec 100644
--- a/gdb/python/py-symtab.c
+++ b/gdb/python/py-symtab.c
@@ -138,6 +138,21 @@ stpy_fullname (PyObject *self, PyObject *args)
   Py_RETURN_NONE;
 }
 
+/* Implementation of gdb.Symtab.is_valid (self) -> Boolean.
+   Returns True if this Symbol table still exists in GDB.  */
+
+static PyObject *
+stpy_is_valid (PyObject *self, PyObject *args)
+{
+  struct symtab *symtab = NULL;
+
+  symtab = symtab_object_to_symtab (self);
+  if (symtab == NULL)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
+
 static PyObject *
 salpy_str (PyObject *self)
 {
@@ -212,6 +227,21 @@ salpy_get_symtab (PyObject *self, void *closure)
   return (PyObject *) self_sal->symtab;
 }
 
+/* Implementation of gdb.Symtab_and_line.is_valid (self) -> Boolean.
+   Returns True if this Symbol table and line object still exists GDB.  */
+
+static PyObject *
+salpy_is_valid (PyObject *self, PyObject *args)
+{
+  struct symtab_and_line *sal;
+
+  sal = sal_object_to_symtab_and_line (self);
+  if (sal == NULL)
+    Py_RETURN_FALSE;
+
+  Py_RETURN_TRUE;
+}
+
 static void
 salpy_dealloc (PyObject *self)
 {
@@ -441,6 +471,9 @@ static PyGetSetDef symtab_object_getset[] = {
 };
 
 static PyMethodDef symtab_object_methods[] = {
+  { "is_valid", stpy_is_valid, METH_NOARGS,
+    "is_valid () -> Boolean.\n\
+Return true if this symbol table is valid, false if not." },
   { "fullname", stpy_fullname, METH_NOARGS,
     "fullname () -> String.\n\
 Return the symtab's full source filename." },
@@ -489,6 +522,13 @@ static PyGetSetDef sal_object_getset[] = {
   {NULL}  /* Sentinel */
 };
 
+static PyMethodDef sal_object_methods[] = {
+  { "is_valid", salpy_is_valid, METH_NOARGS,
+    "is_valid () -> Boolean.\n\
+Return true if this symbol table and line is valid, false if not." },
+  {NULL}  /* Sentinel */
+};
+
 static PyTypeObject sal_object_type = {
   PyObject_HEAD_INIT (NULL)
   0,				  /*ob_size*/
@@ -518,7 +558,7 @@ static PyTypeObject sal_object_type = {
   0,				  /*tp_weaklistoffset */
   0,				  /*tp_iter */
   0,				  /*tp_iternext */
-  0,				  /*tp_methods */
+  sal_object_methods,		  /*tp_methods */
   0,				  /*tp_members */
   sal_object_getset		  /*tp_getset */
 };