1  /* Definitions for code generation pass of GNU compiler.
       2     Copyright (C) 2001-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of GCC.
       5  
       6  GCC is free software; you can redistribute it and/or modify
       7  it under the terms of the GNU General Public License as published by
       8  the Free Software Foundation; either version 3, or (at your option)
       9  any later version.
      10  
      11  GCC is distributed in the hope that it will be useful,
      12  but WITHOUT ANY WARRANTY; without even the implied warranty of
      13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14  GNU General Public License for more details.
      15  
      16  You should have received a copy of the GNU General Public License
      17  along with GCC; see the file COPYING3.  If not see
      18  <http://www.gnu.org/licenses/>.  */
      19  
      20  #ifndef GCC_LIBFUNCS_H
      21  #define GCC_LIBFUNCS_H
      22  
      23  
      24  /* Enumeration of indexes into libfunc_table.  */
      25  enum libfunc_index
      26  {
      27    LTI_unwind_sjlj_register,
      28    LTI_unwind_sjlj_unregister,
      29    LTI_synchronize,
      30    LTI_MAX
      31  };
      32  
      33  /* Information about an optab-related libfunc.  The op field is logically
      34     an enum optab_d, and the mode fields are logically machine_mode.
      35     However, in the absence of forward-declared enums, there's no practical
      36     benefit of pulling in the defining headers.
      37  
      38     We use the same hashtable for normal optabs and conversion optabs.  In
      39     the first case mode2 is forced to VOIDmode.  */
      40  
      41  struct GTY((for_user)) libfunc_entry {
      42    int op, mode1, mode2;
      43    rtx libfunc;
      44  };
      45  
      46  /* Descriptor for libfunc_entry.  */
      47  
      48  struct libfunc_hasher : ggc_ptr_hash<libfunc_entry>
      49  {
      50    static hashval_t hash (libfunc_entry *);
      51    static bool equal (libfunc_entry *, libfunc_entry *);
      52  };
      53  
      54  /* Target-dependent globals.  */
      55  struct GTY(()) target_libfuncs {
      56    /* SYMBOL_REF rtx's for the library functions that are called
      57       implicitly and not via optabs.  */
      58    rtx x_libfunc_table[LTI_MAX];
      59  
      60    /* Hash table used to convert declarations into nodes.  */
      61    hash_table<libfunc_hasher> *GTY(()) x_libfunc_hash;
      62  };
      63  
      64  extern GTY(()) struct target_libfuncs default_target_libfuncs;
      65  #if SWITCHABLE_TARGET
      66  extern struct target_libfuncs *this_target_libfuncs;
      67  #else
      68  #define this_target_libfuncs (&default_target_libfuncs)
      69  #endif
      70  
      71  #define libfunc_table \
      72    (this_target_libfuncs->x_libfunc_table)
      73  
      74  /* Accessor macros for libfunc_table.  */
      75  
      76  #define unwind_sjlj_register_libfunc (libfunc_table[LTI_unwind_sjlj_register])
      77  #define unwind_sjlj_unregister_libfunc \
      78    (libfunc_table[LTI_unwind_sjlj_unregister])
      79  #define synchronize_libfunc	(libfunc_table[LTI_synchronize])
      80  
      81  /* In explow.cc */
      82  extern void set_stack_check_libfunc (const char *);
      83  
      84  #endif /* GCC_LIBFUNCS_H */