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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>
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/* Definitions for inline frame support.
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Copyright (C) 2008-2024 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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#if !defined (INLINE_FRAME_H)
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#define INLINE_FRAME_H 1
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class frame_info_ptr;
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struct frame_unwind;
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struct bpstat;
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struct process_stratum_target;
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/* The inline frame unwinder. */
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extern const struct frame_unwind inline_frame_unwind;
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/* Skip all inlined functions whose call sites are at the current PC.
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If non-NULL, STOP_CHAIN is used to determine whether a stop was caused by
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a user breakpoint. In that case, do not skip that inlined frame. This
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allows the inlined frame to be treated as if it were non-inlined from the
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user's perspective. GDB will stop "in" the inlined frame instead of
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the caller. */
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void skip_inline_frames (thread_info *thread, struct bpstat *stop_chain);
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/* Forget about any hidden inlined functions in PTID, which is new or
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about to be resumed. PTID may be minus_one_ptid (all processes of
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TARGET) or a PID (all threads in this process of TARGET). */
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void clear_inline_frame_state (process_stratum_target *target, ptid_t ptid);
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/* Forget about any hidden inlined functions in THREAD, which is new
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or about to be resumed. */
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void clear_inline_frame_state (thread_info *thread);
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/* Step into an inlined function by unhiding it. */
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void step_into_inline_frame (thread_info *thread);
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/* Return the number of hidden functions inlined into the current
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frame. */
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int inline_skipped_frames (thread_info *thread);
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/* If one or more inlined functions are hidden, return the symbol for
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the function inlined into the current frame. */
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struct symbol *inline_skipped_symbol (thread_info *thread);
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/* Return the number of functions inlined into THIS_FRAME. Some of
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the callees may not have associated frames (see
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skip_inline_frames). */
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int frame_inlined_callees (const frame_info_ptr &this_frame);
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#endif /* !defined (INLINE_FRAME_H) */
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