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binutils-gdb/gdb/sparc64-tdep.h
Simon Marchi 8480a37e14 gdb: pass frames as const frame_info_ptr &
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>
2024-02-20 10:42:25 -05:00

141 lines
4.3 KiB
C++

/* Target-dependent code for UltraSPARC.
Copyright (C) 2003-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef SPARC64_TDEP_H
#define SPARC64_TDEP_H 1
class frame_info_ptr;
struct gdbarch;
struct regcache;
struct sparc_gregmap;
struct trad_frame_saved_reg;
#include "sparc-tdep.h"
/* The stack pointer is offset from the stack frame by a BIAS of 2047
(0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
hosts, so undefine it first. */
#undef BIAS
#define BIAS 2047
/* Register offsets for the general-purpose register set. */
/* UltraSPARC doesn't have %psr. */
#define r_tstate_offset r_psr_offset
/* UltraSPARC doesn't have %wim either. */
#define r_fprs_offset r_wim_offset
/* Register numbers of various important registers. */
enum sparc64_regnum
{
SPARC64_F32_REGNUM /* %f32 */
= SPARC_F0_REGNUM + 32,
SPARC64_F62_REGNUM /* %f62 */
= SPARC64_F32_REGNUM + 15,
SPARC64_PC_REGNUM, /* %pc */
SPARC64_NPC_REGNUM, /* %npc */
SPARC64_STATE_REGNUM,
SPARC64_FSR_REGNUM, /* %fsr */
SPARC64_FPRS_REGNUM, /* %fprs */
SPARC64_Y_REGNUM, /* %y */
};
/* Pseudo registers. */
enum sparc64_pseudo_regnum
{
SPARC64_CWP_REGNUM = 0, /* %cwp */
SPARC64_PSTATE_REGNUM, /* %pstate */
SPARC64_ASI_REGNUM, /* %asi */
SPARC64_CCR_REGNUM, /* %ccr */
SPARC64_D0_REGNUM, /* %d0 */
SPARC64_D10_REGNUM /* %d10 */
= SPARC64_D0_REGNUM + 5,
SPARC64_D30_REGNUM /* %d30 */
= SPARC64_D0_REGNUM + 15,
SPARC64_D32_REGNUM /* %d32 */
= SPARC64_D0_REGNUM + 16,
SPARC64_D62_REGNUM /* %d62 */
= SPARC64_D0_REGNUM + 31,
SPARC64_Q0_REGNUM, /* %q0 */
SPARC64_Q8_REGNUM /* %q8 */
= SPARC64_Q0_REGNUM + 2,
SPARC64_Q28_REGNUM /* %q28 */
= SPARC64_Q0_REGNUM + 7,
SPARC64_Q32_REGNUM /* %q32 */
= SPARC64_Q0_REGNUM + 8,
SPARC64_Q60_REGNUM /* %q60 */
= SPARC64_Q0_REGNUM + 15
};
/* Processor state bits. */
#define SPARC64_PSTATE_AG 0x001
#define SPARC64_PSTATE_IE 0x002
#define SPARC64_PSTATE_PRIV 0x004
#define SPARC64_PSTATE_AM 0x008
#define SPARC64_PSTATE_PEF 0x010
#define SPARC64_PSTATE_RED 0x020
#define SPARC64_PSTATE_TLE 0x100
#define SPARC64_PSTATE_CLE 0x200
#define SPARC64_PSTATE_PID0 0x400
#define SPARC64_PSTATE_PID1 0x800
extern void sparc64_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch);
extern void sparc64_supply_gregset (const struct sparc_gregmap *gregmap,
struct regcache *regcache,
int regnum, const void *gregs);
extern void sparc64_collect_gregset (const struct sparc_gregmap *gregmap,
const struct regcache *regcache,
int regnum, void *gregs);
extern void sparc64_supply_fpregset (const struct sparc_fpregmap *fpregmap,
struct regcache *regcache,
int regnum, const void *fpregs);
extern void sparc64_collect_fpregset (const struct sparc_fpregmap *fpregmap,
const struct regcache *regcache,
int regnum, void *fpregs);
/* Functions and variables exported from sparc64-sol2-tdep.c. */
/* Register offsets for Solaris 2. */
extern const struct sparc_gregmap sparc64_sol2_gregmap;
extern const struct sparc_fpregmap sparc64_sol2_fpregmap;
/* Variables exported from sparc64-fbsd-tdep.c. */
/* Register offsets for FreeBSD/sparc64. */
extern const struct sparc_gregmap sparc64fbsd_gregmap;
/* Functions and variables exported from sparc64-netbsd-tdep.c. */
/* Register offsets for NetBSD/sparc64. */
extern const struct sparc_gregmap sparc64nbsd_gregmap;
extern struct trad_frame_saved_reg *
sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr,
const frame_info_ptr &next_frame);
extern const struct sparc_fpregmap sparc64_bsd_fpregmap;
extern void sparc64_forget_process (pid_t pid);
#endif /* sparc64-tdep.h */