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binutils-gdb/gdb/sparc-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

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/* Target-dependent code for SPARC.
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 SPARC_TDEP_H
#define SPARC_TDEP_H 1
#include "gdbarch.h"
#define SPARC_CORE_REGISTERS \
"g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7", \
"o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7", \
"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", \
"i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7"
class frame_info_ptr;
struct gdbarch;
struct regcache;
struct regset;
struct trad_frame_saved_reg;
/* Register offsets for the general-purpose register set. */
struct sparc_gregmap
{
int r_psr_offset;
int r_pc_offset;
int r_npc_offset;
int r_y_offset;
int r_wim_offset;
int r_tbr_offset;
int r_g1_offset;
int r_l0_offset;
int r_y_size;
};
struct sparc_fpregmap
{
int r_f0_offset;
int r_fsr_offset;
};
/* SPARC architecture-specific information. */
struct sparc_gdbarch_tdep : gdbarch_tdep_base
{
/* Register numbers for the PN and nPC registers. The definitions
for (64-bit) UltraSPARC differ from the (32-bit) SPARC
definitions. */
int pc_regnum = 0;
int npc_regnum = 0;
/* Register names specific for architecture (sparc32 vs. sparc64) */
const char * const *fpu_register_names = nullptr;
size_t fpu_registers_num = 0;
const char * const *cp0_register_names = nullptr;
size_t cp0_registers_num = 0;
/* Register sets. */
const struct regset *gregset = nullptr;
size_t sizeof_gregset = 0;
const struct regset *fpregset = nullptr;
size_t sizeof_fpregset = 0;
/* Offset of saved PC in jmp_buf. */
int jb_pc_offset = 0;
/* Size of an Procedure Linkage Table (PLT) entry, 0 if we shouldn't
treat the PLT special when doing prologue analysis. */
size_t plt_entry_size = 0;
/* Alternative location for trap return. Used for single-stepping. */
CORE_ADDR (*step_trap) (const frame_info_ptr &frame, unsigned long insn)
= nullptr;
/* ISA-specific data types. */
struct type *sparc_psr_type = nullptr;
struct type *sparc_fsr_type = nullptr;
struct type *sparc64_ccr_type = nullptr;
struct type *sparc64_pstate_type = nullptr;
struct type *sparc64_fsr_type = nullptr;
struct type *sparc64_fprs_type = nullptr;
};
/* Register numbers of various important registers. */
enum sparc_regnum
{
SPARC_G0_REGNUM = 0, /* %g0 */
SPARC_G1_REGNUM,
SPARC_G2_REGNUM,
SPARC_G3_REGNUM,
SPARC_G4_REGNUM,
SPARC_G5_REGNUM,
SPARC_G6_REGNUM,
SPARC_G7_REGNUM, /* %g7 */
SPARC_O0_REGNUM, /* %o0 */
SPARC_O1_REGNUM,
SPARC_O2_REGNUM,
SPARC_O3_REGNUM,
SPARC_O4_REGNUM,
SPARC_O5_REGNUM,
SPARC_SP_REGNUM, /* %sp (%o6) */
SPARC_O7_REGNUM, /* %o7 */
SPARC_L0_REGNUM, /* %l0 */
SPARC_L1_REGNUM,
SPARC_L2_REGNUM,
SPARC_L3_REGNUM,
SPARC_L4_REGNUM,
SPARC_L5_REGNUM,
SPARC_L6_REGNUM,
SPARC_L7_REGNUM, /* %l7 */
SPARC_I0_REGNUM, /* %i0 */
SPARC_I1_REGNUM,
SPARC_I2_REGNUM,
SPARC_I3_REGNUM,
SPARC_I4_REGNUM,
SPARC_I5_REGNUM,
SPARC_FP_REGNUM, /* %fp (%i6) */
SPARC_I7_REGNUM, /* %i7 */
SPARC_F0_REGNUM, /* %f0 */
SPARC_F1_REGNUM,
SPARC_F2_REGNUM,
SPARC_F3_REGNUM,
SPARC_F4_REGNUM,
SPARC_F5_REGNUM,
SPARC_F6_REGNUM,
SPARC_F7_REGNUM,
SPARC_F31_REGNUM /* %f31 */
= SPARC_F0_REGNUM + 31
};
enum sparc32_regnum
{
SPARC32_Y_REGNUM /* %y */
= SPARC_F31_REGNUM + 1,
SPARC32_PSR_REGNUM, /* %psr */
SPARC32_WIM_REGNUM, /* %wim */
SPARC32_TBR_REGNUM, /* %tbr */
SPARC32_PC_REGNUM, /* %pc */
SPARC32_NPC_REGNUM, /* %npc */
SPARC32_FSR_REGNUM, /* %fsr */
SPARC32_CSR_REGNUM, /* %csr */
};
/* Pseudo registers. */
enum sparc32_pseudo_regnum
{
SPARC32_D0_REGNUM = 0, /* %d0 */
SPARC32_D30_REGNUM /* %d30 */
= SPARC32_D0_REGNUM + 15
};
struct sparc_frame_cache
{
/* Base address. */
CORE_ADDR base;
CORE_ADDR pc;
/* Do we have a frame? */
int frameless_p;
/* The offset from the base register to the CFA. */
int frame_offset;
/* Mask of `local' and `in' registers saved in the register save area. */
unsigned short int saved_regs_mask;
/* Mask of `out' registers copied or renamed to their `in' sibling. */
unsigned char copied_regs_mask;
/* Do we have a Structure, Union or Quad-Precision return value? */
int struct_return_p;
/* Table of saved registers. */
struct trad_frame_saved_reg *saved_regs;
};
/* Fetch the instruction at PC. */
extern unsigned long sparc_fetch_instruction (CORE_ADDR pc);
/* Fetch StackGhost Per-Process XOR cookie. */
extern ULONGEST sparc_fetch_wcookie (struct gdbarch *gdbarch);
/* Record the effect of a SAVE instruction on CACHE. */
extern void sparc_record_save_insn (struct sparc_frame_cache *cache);
/* Do a full analysis of the prologue at PC and update CACHE accordingly. */
extern CORE_ADDR sparc_analyze_prologue (struct gdbarch *gdbarch,
CORE_ADDR pc, CORE_ADDR current_pc,
struct sparc_frame_cache *cache);
extern struct sparc_frame_cache *
sparc_frame_cache (const frame_info_ptr &this_frame, void **this_cache);
extern struct sparc_frame_cache *
sparc32_frame_cache (const frame_info_ptr &this_frame, void **this_cache);
extern int
sparc_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc);
extern void sparc_supply_rwindow (struct regcache *regcache,
CORE_ADDR sp, int regnum);
extern void sparc_collect_rwindow (const struct regcache *regcache,
CORE_ADDR sp, int regnum);
/* Register offsets for SunOS 4. */
extern const struct sparc_gregmap sparc32_sunos4_gregmap;
extern const struct sparc_fpregmap sparc32_sunos4_fpregmap;
extern const struct sparc_fpregmap sparc32_bsd_fpregmap;
extern void sparc32_supply_gregset (const struct sparc_gregmap *gregmap,
struct regcache *regcache,
int regnum, const void *gregs);
extern void sparc32_collect_gregset (const struct sparc_gregmap *gregmap,
const struct regcache *regcache,
int regnum, void *gregs);
extern void sparc32_supply_fpregset (const struct sparc_fpregmap *fpregmap,
struct regcache *regcache,
int regnum, const void *fpregs);
extern void sparc32_collect_fpregset (const struct sparc_fpregmap *fpregmap,
const struct regcache *regcache,
int regnum, void *fpregs);
extern int sparc_is_annulled_branch_insn (CORE_ADDR pc);
/* Functions and variables exported from sparc-sol2-tdep.c. */
/* Register offsets for Solaris 2. */
extern const struct sparc_gregmap sparc32_sol2_gregmap;
extern const struct sparc_fpregmap sparc32_sol2_fpregmap;
/* Functions and variables exported from sparc-netbsd-tdep.c. */
/* Register offsets for NetBSD. */
extern const struct sparc_gregmap sparc32nbsd_gregmap;
/* Return the address of a system call's alternative return
address. */
extern CORE_ADDR sparcnbsd_step_trap (const frame_info_ptr &frame,
unsigned long insn);
extern void sparc32nbsd_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch);
extern struct trad_frame_saved_reg *
sparc32nbsd_sigcontext_saved_regs (const frame_info_ptr &next_frame);
#endif /* sparc-tdep.h */
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