gdb/

	* python/py-breakpoint.c (bppy_set_condition): New comment.
	* python/py-cmd.c (cmdpy_function): Call also gdbpy_print_stack for
	failed PyUnicode_Decode.
	(cmdpy_completer): Skip element for failed
	python_string_to_host_string.
	(cmdpy_init): Return -1 on failed python_string_to_host_string.
	* python/py-frame.c (frapy_read_var): Extend the function comment.
	* python/py-function.c (fnpy_init): Return -1 on failed
	python_string_to_host_string.
	* python/py-inferior.c (infpy_read_memory, infpy_write_memory): Extend
	the function comment.
	(infpy_search_memory): Extend the function comment.  Remove the
	PyErr_SetString call on already set error state.
	* python/py-param.c (set_parameter_value): Extend the function
	comment.  Return -1 on failed python_string_to_host_string, twice.
	(set_attr): Extend the function comment.
	(compute_enum_values): Extend the function comment.  New variable
	back_to.  Protect self->enumeration by BACK_TO cleanups.  Return 0 on
	failed python_string_to_host_string.
	(get_doc_string): Call gdbpy_print_stack on failed
	python_string_to_host_string.
	(parmpy_init): Extend the function comment.
	* python/py-prettyprint.c (pretty_print_one_value): Likewise.
	(gdbpy_get_display_hint, print_children): Call gdbpy_print_stack on
	failed python_string_to_host_string.
	* python/py-value.c (valpy_new, valpy_getitem, valpy_call)
	(valpy_binop, valpy_richcompare): Extend the function comment.
	* python/python.c
	(struct python_env) <error_type, error_value, error_traceback>: New
	fields.
	(restore_python_env): Handle PyErr_Occurred.  Call PyErr_Restore.
	(ensure_python_env): Call PyErr_Fetch.
	* varobj.c (update_dynamic_varobj_children): Call gdbpy_print_stack on
	failed convert_value_from_python.
	(value_get_print_value): Call gdbpy_print_stack on failed
	python_string_to_target_python_string.

gdb/testsuite/
	* gdb.python/py-error.exp: New file.
	* gdb.python/py-error.py: New file.

1 files changed, 8 insertions, 5 deletions

diff --git a/gdb/python/py-value.c b/gdb/python/py-value.c
index 0aeea7cb532..4445655638c 100644
--- a/gdb/python/py-value.c
+++ b/gdb/python/py-value.c
@@ -119,7 +119,8 @@ note_value (value_object *value_obj)
   values_in_python = value_obj;
 }
 
-/* Called when a new gdb.Value object needs to be allocated.  */
+/* Called when a new gdb.Value object needs to be allocated.  Returns NULL on
+   error, with a python exception set.  */
 static PyObject *
 valpy_new (PyTypeObject *subtype, PyObject *args, PyObject *keywords)
 {
@@ -438,7 +439,7 @@ valpy_length (PyObject *self)
 }
 
 /* Given string name of an element inside structure, return its value
-   object.  */
+   object.  Returns NULL on error, with a python exception set.  */
 static PyObject *
 valpy_getitem (PyObject *self, PyObject *key)
 {
@@ -499,7 +500,7 @@ valpy_setitem (PyObject *self, PyObject *key, PyObject *value)
 }
 
 /* Called by the Python interpreter to perform an inferior function
-   call on the value.  */
+   call on the value.  Returns NULL on error, with a python exception set.  */
 static PyObject *
 valpy_call (PyObject *self, PyObject *args, PyObject *keywords)
 {
@@ -619,7 +620,8 @@ enum valpy_opcode
   ((TYPE_CODE (TYPE) == TYPE_CODE_REF) ? (TYPE_TARGET_TYPE (TYPE)) : (TYPE))
 
 /* Returns a value object which is the result of applying the operation
-   specified by OPCODE to the given arguments.  */
+   specified by OPCODE to the given arguments.  Returns NULL on error, with
+   a python exception set.  */
 static PyObject *
 valpy_binop (enum valpy_opcode opcode, PyObject *self, PyObject *other)
 {
@@ -871,7 +873,8 @@ valpy_xor (PyObject *self, PyObject *other)
   return valpy_binop (VALPY_BITXOR, self, other);
 }
 
-/* Implements comparison operations for value objects.  */
+/* Implements comparison operations for value objects.  Returns NULL on error,
+   with a python exception set.  */
 static PyObject *
 valpy_richcompare (PyObject *self, PyObject *other, int op)
 {