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Fix "set" handling of Python parameters 

It's long bothered me that setting a Python parameter from the CLI
will print the "set" help text by default.  I think usually "set"
commands should be silent.  And, while you can modify this behavior a
bit by providing a "get_set_string" method, if this method returns an
empty string, a blank line will be printed.

This patch removes the "help" behavior and changes the get_set_string
behavior to avoid printing a blank line.  The code has a comment about
preserving API behavior, but I don't think this is truly important;
and in any case the workaround -- implementing get_set_string -- is
trivial.

Regression tested on x86-64 Fedora 26.

2018-04-26  Tom Tromey  <tom@tromey.com>

	* NEWS: Mention new "set" behavior.
	* python/py-param.c (get_set_value): Don't print an empty string.
	Don't call get_doc_string.

gdb/doc/ChangeLog
2018-04-26  Tom Tromey  <tom@tromey.com>

	* python.texi (Parameters In Python): Update get_set_string
	documentation.
This commit is contained in:
Tom Tromey 2018-04-26 16:51:40 -06:00
parent 7729052b53
commit 984ee559a2
4 changed files with 17 additions and 16 deletions
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4
gdb/NEWS
View File

@ -46,6 +46,10 @@ set|show record btrace cpu
gdb.set_convenience_variable can be used to get and set the value
of convenience variables.
** A gdb.Parameter will no longer print the "set" help text on an
ordinary "set"; instead by default a "set" will be silent unless
the get_set_string method returns a non-empty string.
* New targets
RiscV ELF riscv*-*-elf

14
gdb/doc/python.texi
View File

@ -3748,14 +3748,16 @@ parameter. It can be read and assigned to just as any other
attribute. @value{GDBN} does validation when assignments are made.
@end defvar
There are two methods that should be implemented in any
@code{Parameter} class. These are:
There are two methods that may be implemented in any @code{Parameter}
class. These are:
@defun Parameter.get_set_string (self)
@value{GDBN} will call this method when a @var{parameter}'s value has
been changed via the @code{set} API (for example, @kbd{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.
If this method exists, @value{GDBN} will call it when a
@var{parameter}'s value has been changed via the @code{set} API (for
example, @kbd{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. If the returned string is not empty,
@value{GDBN} will present it to the user.
@end defun
@defun Parameter.get_show_string (self, svalue)

11
gdb/python/py-param.c
View File

@ -401,15 +401,10 @@ get_set_value (const char *args, int from_tty,
return;
}
}
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);
}
fprintf_filtered (gdb_stdout, "%s\n", set_doc_string.get ());
const char *str = set_doc_string.get ();
if (str != nullptr && str[0] != '\0')
fprintf_filtered (gdb_stdout, "%s\n", str);
}
/* A callback function that is registered against the respective

4
gdb/testsuite/gdb.python/py-parameter.exp
View File

@ -151,7 +151,7 @@ gdb_py_test_multiple "Simple gdb booleanparameter" \
"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_no_output "set print test-nodoc-param off" "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"
@ -173,7 +173,7 @@ gdb_py_test_multiple "Simple gdb booleanparameter" \
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_no_output "set print test-param off" "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"