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Re: [patch] Implement set/show callback functions in gdb.Parameter
- From: Phil Muldoon <pmuldoon at redhat dot com>
- To: gdb-patches at sourceware dot org
- Date: Mon, 28 Feb 2011 16:34:25 +0000
- Subject: Re: [patch] Implement set/show callback functions in gdb.Parameter
- References: <m3bp2dw9io.fsf@redhat.com>
- Reply-to: pmuldoon at redhat dot com
Phil Muldoon <pmuldoon@redhat.com> writes:
ping
> This patch allows the user to implement two methods in the gdb.Parameter
> object.
>
> get_set_string is called when the 'set' API of the gdb parameter is
> called. GDB will call this Python function, and use the output as the
> output from the 'set' command. Similar happens with get_show_string and
> 'show'. This allows us to remove the deprecated hooks we were calling
> with the old add_setshow_* library of parameters. It also allows the
> user to return data/information on the real-time state of the object as
> the callbacks are executed each time.
>
> Comments?
>
> Cheers
>
> Phil
>
> --
>
>
> 2011-02-15 Phil Muldoon <pmuldoon@redhat.com>
>
> * python/py-param.c (add_setshow_generic): Add set/show callback
> parameters. Register Python object context.
> (get_show_value): New function.
> (get_set_value): New function.
> (call_doc_function): New function.
> (get_doc_string): Move behind get_show_value/get_set_value.
>
> 2011-02-15 Phil Muldoon <pmuldoon@redhat.com>
>
> * gdb.texinfo (Parameters In Python): Document get_set_string and
> get_show_string methods.
>
> 2011-02-15 Phil Muldoon <pmuldoon@redhat.com>
>
> * gdb.python/py-parameter.exp: Update tests to the new Python
> parameter API. Add "no documentation" test. Add deprecated API
> backward compatibility test.
>
> --
>
> diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
> index bed074f..0ad1186 100644
> --- a/gdb/doc/gdb.texinfo
> +++ b/gdb/doc/gdb.texinfo
> @@ -22397,6 +22397,22 @@ parameter. It can be read and assigned to just as any other
> attribute. @value{GDBN} does validation when assignments are made.
> @end defivar
>
> +There are two methods that should be implemented in any Parameter
> +class. These are:
> +
> +@defop Operation {parameter} get_set_string (self)
> +@value{GDBN} will call this method when a parameter has been
> +invoked via the set API (for example, set foo off). The @code{value}
> +attribute has already been populated with the new value and may be
> +used in output. This method must return a string.
> +@end defop
> +
> +@defop Operation {parameter} get_show_string (self, svalue)
> +@value{GDBN} will call this method when the parameter has been
> +invoked via the show API (for example, show foo). The argument
> +@code{svalue} contains a string representing what @value{GDBN} has
> +stored for this parameter. This method must return a string.
> +@end defop
>
> When a new parameter is defined, its type must be specified. The
> available types are represented by constants defined in the @code{gdb}
> diff --git a/gdb/python/py-param.c b/gdb/python/py-param.c
> index 22aa91d..a1c7ddd 100644
> --- a/gdb/python/py-param.c
> +++ b/gdb/python/py-param.c
> @@ -26,6 +26,8 @@
> #include "gdbcmd.h"
> #include "cli/cli-decode.h"
> #include "completer.h"
> +#include "language.h"
> +#include "arch-utils.h"
>
> /* Parameter constants and their values. */
> struct parm_constant
> @@ -289,6 +291,165 @@ set_attr (PyObject *obj, PyObject *attr_name, PyObject *val)
> return PyObject_GenericSetAttr (obj, attr_name, val);
> }
>
> +/* A helper function which returns a documentation string for an
> + object. */
> +
> +static char *
> +get_doc_string (PyObject *object, PyObject *attr)
> +{
> + char *result = NULL;
> +
> + if (PyObject_HasAttr (object, attr))
> + {
> + PyObject *ds_obj = PyObject_GetAttr (object, attr);
> +
> + if (ds_obj && gdbpy_is_string (ds_obj))
> + {
> + result = python_string_to_host_string (ds_obj);
> + if (result == NULL)
> + gdbpy_print_stack ();
> + }
> + }
> + if (! result)
> + result = xstrdup (_("This command is not documented."));
> + return result;
> +}
> +
> +/* Helper function which will execute a METHOD in OBJ passing the
> + argument ARG. ARG can be NULL. METHOD should return a Python
> + string. If this function returns NULL, there has been an error and
> + the appropriate exception set. */
> +static char *
> +call_doc_function (PyObject *obj, PyObject *method, PyObject *arg)
> +{
> + char *data = NULL;
> + struct cleanup *cleanup = make_cleanup (null_cleanup, NULL);
> + PyObject *result = PyObject_CallMethodObjArgs (obj, method, arg, NULL);
> +
> + if (! result)
> + return NULL;
> +
> + make_cleanup_py_decref (result);
> + if (gdbpy_is_string (result))
> + {
> + data = python_string_to_host_string (result);
> + if (data == NULL)
> + goto error;
> + }
> + else
> + {
> + PyErr_SetString (PyExc_RuntimeError,
> + _("Parameter must return a string value."));
> + goto error;
> + }
> +
> + do_cleanups (cleanup);
> + return data;
> +
> + error:
> + do_cleanups (cleanup);
> + return NULL;
> +}
> +
> +/* A callback function that is registered against the respective
> + add_setshow_* set_doc prototype. This function will either call
> + the Python function "get_set_string" or extract the Python
> + attribute "set_doc" and return the contents as a string. If
> + neither exist, insert a string indicating the Parameter is not
> + documented. */
> +static void
> +get_set_value (char *args, int from_tty,
> + struct cmd_list_element *c)
> +{
> + PyObject *obj = (PyObject *) get_cmd_context (c);
> + char *set_doc_string;
> + PyObject *set_doc_func = PyString_FromString ("get_set_string");
> + struct cleanup *cleanup = ensure_python_env (get_current_arch (),
> + current_language);
> +
> + make_cleanup_py_decref (set_doc_func);
> +
> + if (PyObject_HasAttr (obj, set_doc_func))
> + {
> + set_doc_string = call_doc_function (obj, set_doc_func, NULL);
> + if (! set_doc_string)
> + goto error;
> + }
> + else
> + {
> + /* We have to preserve the existing < GDB 7.3 API. If a
> + callback function does not exist, then attempt to read the
> + set_doc attribute. */
> + set_doc_string = get_doc_string (obj, set_doc_cst);
> + }
> +
> + make_cleanup (xfree, set_doc_string);
> + fprintf_filtered (gdb_stdout,"%s\n", set_doc_string);
> +
> + do_cleanups (cleanup);
> + return;
> +
> + error:
> + gdbpy_print_stack ();
> + do_cleanups (cleanup);
> + return;
> +}
> +
> +/* A callback function that is registered against the respective
> + add_setshow_* show_doc prototype. This function will either call
> + the Python function "get_show_string" or extract the Python
> + attribute "show_doc" and return the contents as a string. If
> + neither exist, insert a string indicating the Parameter is not
> + documented. */
> +static void
> +get_show_value (struct ui_file *file, int from_tty,
> + struct cmd_list_element *c,
> + const char *value)
> +{
> + PyObject *obj = (PyObject *) get_cmd_context (c);
> + char *show_doc_string = NULL;
> + PyObject *show_doc_func = PyString_FromString ("get_show_string");
> + struct cleanup *cleanup = ensure_python_env (get_current_arch (),
> + current_language);
> +
> + make_cleanup_py_decref (show_doc_func);
> +
> + if (PyObject_HasAttr (obj, show_doc_func))
> + {
> + PyObject *result;
> + PyObject *val_obj = PyString_FromString (value);
> +
> + if (! val_obj)
> + goto error;
> +
> + make_cleanup_py_decref (val_obj);
> +
> + show_doc_string = call_doc_function (obj, show_doc_func, val_obj);
> + if (! show_doc_string)
> + goto error;
> +
> + make_cleanup (xfree, show_doc_string);
> +
> + fprintf_filtered (file,"%s\n", show_doc_string);
> + }
> + else
> + {
> + /* We have to preserve the existing < GDB 7.3 API. If a
> + callback function does not exist, then attempt to read the
> + show_doc attribute. */
> + show_doc_string = get_doc_string (obj, show_doc_cst);
> + make_cleanup(xfree, show_doc_string);
> + fprintf_filtered (file,"%s %s\n", show_doc_string, value);
> + }
> +
> + do_cleanups (cleanup);
> + return;
> +
> + error:
> + gdbpy_print_stack ();
> + do_cleanups (cleanup);
> + return;
> +}
>
>
> /* A helper function that dispatches to the appropriate add_setshow
> @@ -300,74 +461,95 @@ add_setshow_generic (int parmclass, enum command_class cmdclass,
> struct cmd_list_element **set_list,
> struct cmd_list_element **show_list)
> {
> - switch (parmclass)
> - {
> - case var_boolean:
> - add_setshow_boolean_cmd (cmd_name, cmdclass, &self->value.intval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> + struct cmd_list_element *param = NULL;
> + char *tmp_name = NULL;
> +
> + switch (parmclass) { case var_boolean:
> +
> + add_setshow_boolean_cmd (cmd_name, cmdclass,
> + &self->value.intval, set_doc, show_doc,
> + help_doc, get_set_value, get_show_value,
> + set_list, show_list);
> +
> break;
>
> case var_auto_boolean:
> add_setshow_auto_boolean_cmd (cmd_name, cmdclass,
> &self->value.autoboolval,
> set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> + get_set_value, get_show_value,
> + set_list, show_list);
> break;
>
> case var_uinteger:
> - add_setshow_uinteger_cmd (cmd_name, cmdclass, &self->value.uintval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> + add_setshow_uinteger_cmd (cmd_name, cmdclass,
> + &self->value.uintval, set_doc, show_doc,
> + help_doc, get_set_value, get_show_value,
> + set_list, show_list);
> break;
>
> case var_integer:
> - add_setshow_integer_cmd (cmd_name, cmdclass, &self->value.intval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> - break;
> + add_setshow_integer_cmd (cmd_name, cmdclass,
> + &self->value.intval, set_doc, show_doc,
> + help_doc, get_set_value, get_show_value,
> + set_list, show_list); break;
>
> case var_string:
> - add_setshow_string_cmd (cmd_name, cmdclass, &self->value.stringval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> - break;
> + add_setshow_string_cmd (cmd_name, cmdclass,
> + &self->value.stringval, set_doc, show_doc,
> + help_doc, get_set_value, get_show_value,
> + set_list, show_list); break;
>
> case var_string_noescape:
> add_setshow_string_noescape_cmd (cmd_name, cmdclass,
> &self->value.stringval,
> set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> + get_set_value, get_show_value,
> + set_list, show_list);
> +
> break;
>
> case var_optional_filename:
> add_setshow_optional_filename_cmd (cmd_name, cmdclass,
> - &self->value.stringval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> + &self->value.stringval, set_doc,
> + show_doc, help_doc, get_set_value,
> + get_show_value, set_list,
> + show_list);
> break;
>
> case var_filename:
> - add_setshow_filename_cmd (cmd_name, cmdclass, &self->value.stringval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> - break;
> + add_setshow_filename_cmd (cmd_name, cmdclass,
> + &self->value.stringval, set_doc, show_doc,
> + help_doc, get_set_value, get_show_value,
> + set_list, show_list); break;
>
> case var_zinteger:
> - add_setshow_zinteger_cmd (cmd_name, cmdclass, &self->value.intval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> + add_setshow_zinteger_cmd (cmd_name, cmdclass,
> + &self->value.intval, set_doc, show_doc,
> + help_doc, get_set_value, get_show_value,
> + set_list, show_list);
> break;
>
> case var_enum:
> add_setshow_enum_cmd (cmd_name, cmdclass, self->enumeration,
> - &self->value.cstringval,
> - set_doc, show_doc, help_doc,
> - NULL, NULL, set_list, show_list);
> + &self->value.cstringval, set_doc, show_doc,
> + help_doc, get_set_value, get_show_value,
> + set_list, show_list);
> /* Initialize the value, just in case. */
> self->value.cstringval = self->enumeration[0];
> break;
> }
> +
> + /* Lookup created parameter, and register Python object against the
> + parameter context. Perform this task against both lists. */
> + tmp_name = cmd_name;
> + param = lookup_cmd (&tmp_name, *show_list, "", 0, 1);
> + if (param)
> + set_cmd_context (param, self);
> +
> + tmp_name = cmd_name;
> + param = lookup_cmd (&tmp_name, *set_list, "", 0, 1);
> + if (param)
> + set_cmd_context (param, self);
> }
>
> /* A helper which computes enum values. Returns 1 on success. Returns 0 on
> @@ -435,29 +617,6 @@ compute_enum_values (parmpy_object *self, PyObject *enum_values)
> return 1;
> }
>
> -/* A helper function which returns a documentation string for an
> - object. */
> -static char *
> -get_doc_string (PyObject *object, PyObject *attr)
> -{
> - char *result = NULL;
> -
> - if (PyObject_HasAttr (object, attr))
> - {
> - PyObject *ds_obj = PyObject_GetAttr (object, attr);
> -
> - if (ds_obj && gdbpy_is_string (ds_obj))
> - {
> - result = python_string_to_host_string (ds_obj);
> - if (result == NULL)
> - gdbpy_print_stack ();
> - }
> - }
> - if (! result)
> - result = xstrdup (_("This command is not documented."));
> - return result;
> -}
> -
> /* Object initializer; sets up gdb-side structures for command.
>
> Use: __init__(NAME, CMDCLASS, PARMCLASS, [ENUM])
> diff --git a/gdb/testsuite/gdb.python/py-parameter.exp b/gdb/testsuite/gdb.python/py-parameter.exp
> index 261c0d5..63f4ff2 100644
> --- a/gdb/testsuite/gdb.python/py-parameter.exp
> +++ b/gdb/testsuite/gdb.python/py-parameter.exp
> @@ -38,8 +38,15 @@ gdb_py_test_multiple "Simple gdb booleanparameter" \
> "python" "" \
> "class TestParam (gdb.Parameter):" "" \
> " \"\"\"When enabled, test param does something useful. When disabled, does nothing.\"\"\"" "" \
> - " show_doc = \"Show whether the state of the Test Parameter does something useful\"" ""\
> - " set_doc = \"Set whether the state of the Test Parameter does something useful\"" "" \
> + " show_doc = \"Show the state of the boolean test-param\"" ""\
> + " set_doc = \"Set the state of the boolean test-param\"" "" \
> + " def get_show_string (self, pvalue):" ""\
> + " return \"The state of the Test Parameter is \" + pvalue" ""\
> + " def get_set_string (self):" ""\
> + " val = \"on\"" ""\
> + " if (self.value == False):" ""\
> + " val = \"off\"" ""\
> + " return \"Test Parameter has been set to \" + val" ""\
> " def __init__ (self, name):" "" \
> " super (TestParam, self).__init__ (name, gdb.COMMAND_DATA, gdb.PARAM_BOOLEAN)" "" \
> " self.value = True" "" \
> @@ -47,13 +54,14 @@ gdb_py_test_multiple "Simple gdb booleanparameter" \
> "end"
>
> gdb_test "python print test_param.value" "True" "Test parameter value"
> -gdb_test "show print test-param" "Whether the state of the Test Parameter does something useful is on.*" "Show parameter on"
> -gdb_py_test_silent_cmd "set print test-param off" "Turn off parameter" 1
> -gdb_test "show print test-param" "Whether the state of the Test Parameter does something useful is off.*" "Show parameter off"
> +gdb_test "show print test-param" "The state of the Test Parameter is on.*" "Show parameter on"
> +gdb_test "set print test-param off" "Test Parameter has been set to off" "Turn off parameter"
> +gdb_test "show print test-param" "The state of the Test Parameter is off.*" "Show parameter off"
> gdb_test "python print test_param.value" "False" "Test parameter value"
> -gdb_test "help show print test-param" "Show whether the state of the Test Parameter does something useful.*" "Test show help"
> -gdb_test "help set print test-param" "Set whether the state of the Test Parameter does something useful.*" "Test set help"
> -gdb_test "help set print" "set print test-param -- Set whether the state of the Test Parameter.*" "Test general help"
> +gdb_test "help show print test-param" "Show the state of the boolean test-param.*" "Test show help"
> +gdb_test "help set print test-param" "Set the state of the boolean test-param.*" "Test set help"
> +gdb_test "help set print" "set print test-param -- Set the state of the boolean test-param.*" "Test general help"
> +
>
> # Test an enum parameter.
> gdb_py_test_multiple "enum gdb parameter" \
> @@ -62,6 +70,10 @@ gdb_py_test_multiple "enum gdb parameter" \
> " \"\"\"When set, test param does something useful. When disabled, does nothing.\"\"\"" "" \
> " show_doc = \"Show the state of the enum\"" ""\
> " set_doc = \"Set the state of the enum\"" "" \
> + " def get_show_string (self, pvalue):" ""\
> + " return \"The state of the enum is \" + pvalue" ""\
> + " def get_set_string (self):" ""\
> + " return \"The state of the enum has been set to \" + self.value" ""\
> " def __init__ (self, name):" "" \
> " super (TestEnumParam, self).__init__ (name, gdb.COMMAND_DATA, gdb.PARAM_ENUM, \[\"one\", \"two\"\])" "" \
> " self.value = \"one\"" "" \
> @@ -69,9 +81,9 @@ gdb_py_test_multiple "enum gdb parameter" \
> "end"
>
> gdb_test "python print test_enum_param.value" "one" "Test enum parameter value"
> -gdb_test "show print test-enum-param" "The state of the enum is \"one\".*" "Show parameter is initial value"
> -gdb_py_test_silent_cmd "set print test-enum-param two" "Set parameter to enum value" 1
> -gdb_test "show print test-enum-param" "The state of the enum is \"two\".*" "Show parameter is new value"
> +gdb_test "show print test-enum-param" "The state of the enum is one.*" "Show parameter is initial value"
> +gdb_test "set print test-enum-param two" "The state of the enum has been set to two" "Set enum to two"
> +gdb_test "show print test-enum-param" "The state of the enum is two.*" "Show parameter is new value"
> gdb_test "python print test_enum_param.value" "two" "Test enum parameter value"
> gdb_test "set print test-enum-param three" "Undefined item: \"three\".*" "Set invalid enum parameter"
>
> @@ -82,6 +94,10 @@ gdb_py_test_multiple "file gdb parameter" \
> " \"\"\"When set, test param does something useful. When disabled, does nothing.\"\"\"" "" \
> " show_doc = \"Show the name of the file\"" ""\
> " set_doc = \"Set the name of the file\"" "" \
> + " def get_show_string (self, pvalue):" ""\
> + " return \"The name of the file is \" + pvalue" ""\
> + " def get_set_string (self):" ""\
> + " return \"The name of the file has been changed to \" + self.value" ""\
> " def __init__ (self, name):" "" \
> " super (TestFileParam, self).__init__ (name, gdb.COMMAND_FILES, gdb.PARAM_FILENAME)" "" \
> " self.value = \"foo.txt\"" "" \
> @@ -89,28 +105,73 @@ gdb_py_test_multiple "file gdb parameter" \
> "end"
>
> gdb_test "python print test_file_param.value" "foo.txt" "Test file parameter value"
> -gdb_test "show test-file-param" "The name of the file is \"foo.txt\".*" "Show initial file value"
> -gdb_py_test_silent_cmd "set test-file-param bar.txt" "Set new file parameter" 1
> -gdb_test "show test-file-param" "The name of the file is \"bar.txt\".*" "Show new file value"
> +gdb_test "show test-file-param" "The name of the file is foo.txt.*" "Show initial file value"
> +gdb_test "set test-file-param bar.txt" "The name of the file has been changed to bar.txt" "Set new file parameter" 1
> +gdb_test "show test-file-param" "The name of the file is bar.txt.*" "Show new file value"
> gdb_test "python print test_file_param.value" "bar.txt" "Test new file parameter value"
> gdb_test "set test-file-param" "Argument required.*"
>
> -# Test a file parameter.
> -gdb_py_test_multiple "file gdb parameter" \
> +# Test a parameter that is not documented.
> +gdb_py_test_multiple "Simple gdb booleanparameter" \
> "python" "" \
> - "class TestFileParam (gdb.Parameter):" "" \
> - " \"\"\"When set, test param does something useful. When disabled, does nothing.\"\"\"" "" \
> - " show_doc = \"Show the name of the file\"" ""\
> - " set_doc = \"Set the name of the file\"" "" \
> + "class TestUndocParam (gdb.Parameter):" "" \
> + " def get_show_string (self, pvalue):" ""\
> + " return \"The state of the Test Parameter is \" + pvalue" ""\
> + " def get_set_string (self):" ""\
> + " val = \"on\"" ""\
> + " if (self.value == False):" ""\
> + " val = \"off\"" ""\
> + " return \"Test Parameter has been set to \" + val" ""\
> " def __init__ (self, name):" "" \
> - " super (TestFileParam, self).__init__ (name, gdb.COMMAND_FILES, gdb.PARAM_FILENAME)" "" \
> - " self.value = \"foo.txt\"" "" \
> - "test_file_param = TestFileParam ('test-file-param')" ""\
> + " super (TestUndocParam, self).__init__ (name, gdb.COMMAND_DATA, gdb.PARAM_BOOLEAN)" "" \
> + " self.value = True" "" \
> + "test_undoc_param = TestUndocParam ('print test-undoc-param')" ""\
> "end"
>
> -gdb_test "python print test_file_param.value" "foo.txt" "Test parameter value"
> -gdb_test "show test-file-param" "The name of the file is \"foo.txt\".*" "Show parameter on"
> -gdb_py_test_silent_cmd "set test-file-param bar.txt" "Turn off parameter" 1
> -gdb_test "show test-file-param" "The name of the file is \"bar.txt\".*" "Show parameter on"
> -gdb_test "python print test_file_param.value" "bar.txt" "Test parameter value"
> -gdb_test "set test-file-param" "Argument required.*"
> +gdb_test "show print test-undoc-param" "The state of the Test Parameter is on.*" "Show parameter on"
> +gdb_test "set print test-undoc-param off" "Test Parameter has been set to off" "Turn off parameter"
> +gdb_test "show print test-undoc-param" "The state of the Test Parameter is off.*" "Show parameter off"
> +gdb_test "python print test_undoc_param.value" "False" "Test parameter value"
> +gdb_test "help show print test-undoc-param" "This command is not documented.*" "Test show help"
> +gdb_test "help set print test-undoc-param" "This command is not documented.*" "Test set help"
> +gdb_test "help set print" "set print test-undoc-param -- This command is not documented.*" "Test general help"
> +
> +# Test a parameter that is not documented in any way..
> +gdb_py_test_multiple "Simple gdb booleanparameter" \
> + "python" "" \
> + "class TestNodocParam (gdb.Parameter):" "" \
> + " def __init__ (self, name):" "" \
> + " super (TestNodocParam, self).__init__ (name, gdb.COMMAND_DATA, gdb.PARAM_BOOLEAN)" "" \
> + " self.value = True" "" \
> + "test_nodoc_param = TestNodocParam ('print test-nodoc-param')" ""\
> + "end"
> +
> +gdb_test "show print test-nodoc-param" "This command is not documented.*" "Show parameter on"
> +gdb_test "set print test-nodoc-param off" "This command is not documented.*" "Turn off parameter"
> +gdb_test "show print test-nodoc-param" "This command is not documented.*.*" "Show parameter off"
> +gdb_test "python print test_nodoc_param.value" "False" "Test parameter value"
> +gdb_test "help show print test-nodoc-param" "This command is not documented.*" "Test show help"
> +gdb_test "help set print test-nodoc-param" "This command is not documented.*" "Test set help"
> +gdb_test "help set print" "set print test-nodoc-param -- This command is not documented.*" "Test general help"
> +
> +# Test deprecated API. Do not use in your own implementations.
> +gdb_py_test_multiple "Simple gdb booleanparameter" \
> + "python" "" \
> + "class TestParam (gdb.Parameter):" "" \
> + " \"\"\"When enabled, test param does something useful. When disabled, does nothing.\"\"\"" "" \
> + " show_doc = \"State of the Test Parameter\"" ""\
> + " set_doc = \"Set the state of the Test Parameter\"" "" \
> + " def __init__ (self, name):" "" \
> + " super (TestParam, self).__init__ (name, gdb.COMMAND_DATA, gdb.PARAM_BOOLEAN)" "" \
> + " self.value = True" "" \
> + "test_param = TestParam ('print test-param')" ""\
> + "end"
> +
> +gdb_test "python print test_param.value" "True" "Test parameter value"
> +gdb_test "show print test-param" "State of the Test Parameter on.*" "Show parameter on"
> +gdb_test "set print test-param off" "Set the state of the Test Parameter.*" "Turn off parameter"
> +gdb_test "show print test-param" "State of the Test Parameter off.*" "Show parameter off"
> +gdb_test "python print test_param.value" "False" "Test parameter value"
> +gdb_test "help show print test-param" "State of the Test Parameter.*" "Test show help"
> +gdb_test "help set print test-param" "Set the state of the Test Parameter.*" "Test set help"
> +gdb_test "help set print" "set print test-param -- Set the state of the Test Parameter.*" "Test general help"