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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>
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* Target-dependent header for the LoongArch architecture, for GDB.
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Copyright (C) 2022-2024 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 LOONGARCH_TDEP_H
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#define LOONGARCH_TDEP_H
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#include "gdbarch.h"
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#include "arch/loongarch.h"
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#include "regset.h"
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#include "elf/loongarch.h"
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#include "opcode/loongarch.h"
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/* Register set definitions. */
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extern const struct regset loongarch_gregset;
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extern const struct regset loongarch_fpregset;
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extern const struct regset loongarch_lsxregset;
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extern const struct regset loongarch_lasxregset;
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extern const struct regset loongarch_lbtregset;
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/* Target-dependent structure in gdbarch. */
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struct loongarch_gdbarch_tdep : gdbarch_tdep_base
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{
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/* Features about the abi that impact how the gdbarch is configured. */
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struct loongarch_gdbarch_features abi_features;
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/* Return the expected next PC if FRAME is stopped at a syscall instruction. */
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CORE_ADDR (*syscall_next_pc) (const frame_info_ptr &frame) = nullptr;
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};
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#endif /* LOONGARCH_TDEP_H */
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