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Re: [PATCH] Don't prune program spaces when doing "maintenance info program-spaces"
- From: Doug Evans <dje at google dot com>
- To: Simon Marchi <simon dot marchi at ericsson dot com>
- Cc: gdb-patches <gdb-patches at sourceware dot org>
- Date: Wed, 24 Sep 2014 15:48:38 -0700
- Subject: Re: [PATCH] Don't prune program spaces when doing "maintenance info program-spaces"
- Authentication-results: sourceware.org; auth=none
- References: <1411582288-20967-1-git-send-email-simon dot marchi at ericsson dot com>
On Wed, Sep 24, 2014 at 11:11 AM, Simon Marchi
> While debugging a program spaces issue, I found that "maintenance info
> program-spaces" pruned the program spaces prior to printing them. I
> don't think a command to inspect the state of the program (especially
> a maintenance one) should modify the state. All it can do is potentially
> hide bugs.
> * progspace.c (print_program_space): Add "prune" parameter.
> (maintenance_info_program_spaces_command): Update call to
> print_program_space with new parameter.
> gdb/progspace.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
> diff --git a/gdb/progspace.c b/gdb/progspace.c
> index a74b6ab..aef2d4e 100644
> --- a/gdb/progspace.c
> +++ b/gdb/progspace.c
> @@ -272,18 +272,19 @@ prune_program_spaces (void)
> /* Prints the list of program spaces and their details on UIOUT. If
> REQUESTED is not -1, it's the ID of the pspace that should be
> - printed. Otherwise, all spaces are printed. */
> + printed. Otherwise, all spaces are printed. If PRUNE is true,
> + prune the unused program spaces prior to printing them, so they
> + won't be displayed. */
> static void
> -print_program_space (struct ui_out *uiout, int requested)
> +print_program_space (struct ui_out *uiout, int requested, int prune)
> struct program_space *pspace;
> int count = 0;
> struct cleanup *old_chain;
> - /* Might as well prune away unneeded ones, so the user doesn't even
> - seem them. */
> - prune_program_spaces ();
> + if (prune)
> + prune_program_spaces ();
> /* Compute number of pspaces we will print. */
> ALL_PSPACES (pspace)
> @@ -385,7 +386,7 @@ maintenance_info_program_spaces_command (char *args, int from_tty)
> error (_("program space ID %d not known."), requested);
> - print_program_space (current_uiout, requested);
> + print_program_space (current_uiout, requested, 0 /* prune */);
> /* Simply returns the count of program spaces. */
I agree we want to, in general, avoid side-effects in info commands
(even more so in maint info commands).
OTOH, as a reader of this code I wouldn't expect a print routine to
have side-effects either.
IOW, how about move the call to prune_program_spaces to whatever
caller wants it.
btw, is part of this patch missing?
Is there intended to be another caller of print_program_spaces that
passes prune = 1?