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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>
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
/* Frame unwinder for ia64 frames with libunwind frame information.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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Contributed by Jeff Johnston.
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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 IA64_LIBUNWIND_TDEP_H
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#define IA64_LIBUNWIND_TDEP_H 1
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class frame_info_ptr;
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struct frame_id;
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struct regcache;
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struct gdbarch;
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struct frame_unwind;
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/* IA-64 is the only target that currently uses libunwind. If some
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other target wants to use it, we will need to do some abstracting
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in order to make it possible to have more than one
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ia64-libunwind-tdep instance. Including "libunwind.h" is wrong as
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that ends up including the libunwind-$(arch).h for the host gdb is
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running on. */
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#include "libunwind-ia64.h"
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#include "gdbarch.h"
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struct libunwind_descr
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{
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int (*gdb2uw) (int) = nullptr;
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int (*uw2gdb) (int) = nullptr;
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int (*is_fpreg) (int) = nullptr;
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void *accessors = nullptr;
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void *special_accessors = nullptr;
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};
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int libunwind_frame_sniffer (const struct frame_unwind *self,
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const frame_info_ptr &this_frame,
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void **this_cache);
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int libunwind_sigtramp_frame_sniffer (const struct frame_unwind *self,
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const frame_info_ptr &this_frame,
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void **this_cache);
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void libunwind_frame_set_descr (struct gdbarch *arch,
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struct libunwind_descr *descr);
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void libunwind_frame_this_id (const frame_info_ptr &this_frame, void **this_cache,
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struct frame_id *this_id);
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struct value *libunwind_frame_prev_register (const frame_info_ptr &this_frame,
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void **this_cache, int regnum);
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void libunwind_frame_dealloc_cache (frame_info_ptr self, void *cache);
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int libunwind_is_initialized (void);
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int libunwind_search_unwind_table (void *as, long ip, void *di,
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void *pi, int need_unwind_info, void *args);
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unw_word_t libunwind_find_dyn_list (unw_addr_space_t, unw_dyn_info_t *,
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void *);
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int libunwind_get_reg_special (struct gdbarch *gdbarch,
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readable_regcache *regcache,
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int regnum, void *buf);
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#endif /* IA64_LIBUNWIND_TDEP_H */
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