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8480a37e14
We currently pass frames to function by value, as `frame_info_ptr`.
This is somewhat expensive:
- the size of `frame_info_ptr` is 64 bytes, which is a bit big to pass
by value
- the constructors and destructor link/unlink the object in the global
`frame_info_ptr::frame_list` list. This is an `intrusive_list`, so
it's not so bad: it's just assigning a few points, there's no memory
allocation as if it was `std::list`, but still it's useless to do
that over and over.
As suggested by Tom Tromey, change many function signatures to accept
`const frame_info_ptr &` instead of `frame_info_ptr`.
Some functions reassign their `frame_info_ptr` parameter, like:
void
the_func (frame_info_ptr frame)
{
for (; frame != nullptr; frame = get_prev_frame (frame))
{
...
}
}
I wondered what to do about them, do I leave them as-is or change them
(and need to introduce a separate local variable that can be
re-assigned). I opted for the later for consistency. It might not be
clear why some functions take `const frame_info_ptr &` while others take
`frame_info_ptr`. Also, if a function took a `frame_info_ptr` because
it did re-assign its parameter, I doubt that we would think to change it
to `const frame_info_ptr &` should the implementation change such that
it doesn't need to take `frame_info_ptr` anymore. It seems better to
have a simple rule and apply it everywhere.
Change-Id: I59d10addef687d157f82ccf4d54f5dde9a963fd0
Approved-By: Andrew Burgess <aburgess@redhat.com>
88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
/* Stack manipulation commands, for GDB the GNU Debugger.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef STACK_H
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#define STACK_H
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gdb::unique_xmalloc_ptr<char> find_frame_funname (const frame_info_ptr &frame,
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enum language *funlang,
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struct symbol **funcp);
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typedef gdb::function_view<void (const char *print_name, struct symbol *sym)>
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iterate_over_block_arg_local_vars_cb;
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void iterate_over_block_arg_vars (const struct block *block,
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iterate_over_block_arg_local_vars_cb cb);
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void iterate_over_block_local_vars (const struct block *block,
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iterate_over_block_arg_local_vars_cb cb);
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/* Initialize *WHAT to be a copy of the user desired print what frame info.
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If !WHAT.has_value (), the printing function chooses a default set of
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information to print, otherwise the printing function should print
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the relevant information. */
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void get_user_print_what_frame_info (std::optional<enum print_what> *what);
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/* Return true if we should display the address in addition to the location,
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because we are in the middle of a statement. */
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bool frame_show_address (const frame_info_ptr &frame, struct symtab_and_line sal);
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/* Forget the last sal we displayed. */
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void clear_last_displayed_sal (void);
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/* Is our record of the last sal we displayed valid? If not, the
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get_last_displayed_* functions will return NULL or 0, as appropriate. */
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bool last_displayed_sal_is_valid (void);
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/* Get the pspace of the last sal we displayed, if it's valid, otherwise
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return nullptr. */
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struct program_space* get_last_displayed_pspace (void);
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/* Get the address of the last sal we displayed, if it's valid, otherwise
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return an address of 0. */
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CORE_ADDR get_last_displayed_addr (void);
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/* Get the symtab of the last sal we displayed, if it's valid, otherwise
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return nullptr. */
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struct symtab* get_last_displayed_symtab (void);
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/* Get the line of the last sal we displayed, if it's valid, otherwise
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return 0. */
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int get_last_displayed_line (void);
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/* Get the last sal we displayed, if it's valid, otherwise return a
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symtab_and_line constructed in its default state. */
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symtab_and_line get_last_displayed_sal ();
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/* Completer for the "frame apply all" command. */
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void frame_apply_all_cmd_completer (struct cmd_list_element *ignore,
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completion_tracker &tracker,
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const char *text, const char */*word*/);
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#endif /* #ifndef STACK_H */
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