gcc/builtins.h

   1 /* Expand builtin functions.
   2    Copyright (C) 1988-2023 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 it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 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_BUILTINS_H
  21 #define GCC_BUILTINS_H
  22
  23 #include <mpc.h>
  24
  25 /* Target-dependent globals.  */
  26 struct target_builtins {
  27   /* For each register that may be used for calling a function, this
  28      gives a mode used to copy the register's value.  VOIDmode indicates
  29      the register is not used for calling a function.  If the machine
  30      has register windows, this gives only the outbound registers.
  31      INCOMING_REGNO gives the corresponding inbound register.  */
  32   fixed_size_mode_pod x_apply_args_mode[FIRST_PSEUDO_REGISTER];
  33
  34   /* For each register that may be used for returning values, this gives
  35      a mode used to copy the register's value.  VOIDmode indicates the
  36      register is not used for returning values.  If the machine has
  37      register windows, this gives only the outbound registers.
  38      INCOMING_REGNO gives the corresponding inbound register.  */
  39   fixed_size_mode_pod x_apply_result_mode[FIRST_PSEUDO_REGISTER];
  40 };
  41
  42 extern struct target_builtins default_target_builtins;
  43 #if SWITCHABLE_TARGET
  44 extern struct target_builtins *this_target_builtins;
  45 #else
  46 #define this_target_builtins (&default_target_builtins)
  47 #endif
  48
  49 /* Non-zero if __builtin_constant_p should be folded right away.  */
  50 extern bool force_folding_builtin_constant_p;
  51
  52 extern bool called_as_built_in (tree);
  53 extern bool get_object_alignment_1 (tree, unsigned int *,
  54                                     unsigned HOST_WIDE_INT *);
  55 extern bool get_object_alignment_2 (tree, unsigned int *,
  56                                     unsigned HOST_WIDE_INT *, bool);
  57 extern unsigned int get_object_alignment (tree);
  58 extern bool get_pointer_alignment_1 (tree, unsigned int *,
  59                                      unsigned HOST_WIDE_INT *);
  60 extern unsigned int get_pointer_alignment (tree);
  61 extern unsigned string_length (const void*, unsigned, unsigned);
  62
  63 struct c_strlen_data
  64 {
  65   /* [MINLEN, MAXBOUND, MAXLEN] is a range describing the length of
  66      one or more strings of possibly unknown length.  For a single
  67      string of known length the range is a constant where
  68      MINLEN == MAXBOUND == MAXLEN holds.
  69      For other strings, MINLEN is the length of the shortest known
  70      string.  MAXBOUND is the length of a string that could be stored
  71      in the largest array referenced by the expression.  MAXLEN is
  72      the length of the longest sequence of non-zero bytes
  73      in an object referenced by the expression.  For such strings,
  74      MINLEN <= MAXBOUND <= MAXLEN holds.  For example, given:
  75        struct A { char a[7], b[]; };
  76        extern struct A *p;
  77        n = strlen (p->a);
  78      the computed range will be [0, 6, ALL_ONES].
  79      However, for a conditional expression involving a string
  80      of known length and an array of unknown bound such as
  81        n = strlen (i ? p->b : "123");
  82      the range will be [3, 3, ALL_ONES].
  83      MINLEN != 0 && MAXLEN == ALL_ONES indicates that MINLEN is
  84      the length of the shortest known string and implies that
  85      the shortest possible string referenced by the expression may
  86      actually be the empty string.  This distinction is useful for
  87      diagnostics.  get_range_strlen() return value distinguishes
  88      between these two cases.
  89      As the tighter (and more optimistic) bound, MAXBOUND is suitable
  90      for diagnostics but not for optimization.
  91      As the more conservative bound, MAXLEN is intended to be used
  92      for optimization.  */
  93   tree minlen;
  94   tree maxlen;
  95   tree maxbound;
  96   /* When non-null, DECL refers to the declaration known to store
  97      an unterminated constant character array, as in:
  98      const char s[] = { 'a', 'b', 'c' };
  99      It is used to diagnose uses of such arrays in functions such as
 100      strlen() that expect a nul-terminated string as an argument.  */
 101   tree decl;
 102   /* Non-constant offset from the beginning of a string not accounted
 103      for in the length range.  Used to improve diagnostics.  */
 104   tree off;
 105 };
 106
 107 extern tree c_strlen (tree, int, c_strlen_data * = NULL, unsigned = 1);
 108 extern rtx c_readstr (const char *, scalar_int_mode, bool = true);
 109 extern void expand_builtin_setjmp_setup (rtx, rtx);
 110 extern void expand_builtin_setjmp_receiver (rtx);
 111 extern void expand_builtin_update_setjmp_buf (rtx);
 112 extern tree mathfn_built_in (tree, enum built_in_function fn);
 113 extern tree mathfn_built_in (tree, combined_fn);
 114 extern tree mathfn_built_in_type (combined_fn);
 115 extern rtx builtin_strncpy_read_str (void *, void *, HOST_WIDE_INT,
 116                                      fixed_size_mode);
 117 extern rtx builtin_memset_read_str (void *, void *, HOST_WIDE_INT,
 118                                     fixed_size_mode);
 119 extern rtx expand_builtin_memset (tree, rtx, machine_mode);
 120 extern rtx expand_builtin_saveregs (void);
 121 extern tree std_build_builtin_va_list (void);
 122 extern tree std_fn_abi_va_list (tree);
 123 extern tree std_canonical_va_list_type (tree);
 124 extern void std_expand_builtin_va_start (tree, rtx);
 125 extern void expand_builtin_trap (void);
 126 extern void expand_ifn_atomic_bit_test_and (gcall *);
 127 extern void expand_ifn_atomic_compare_exchange (gcall *);
 128 extern void expand_ifn_atomic_op_fetch_cmp_0 (gcall *);
 129 extern rtx expand_builtin (tree, rtx, rtx, machine_mode, int);
 130 extern enum built_in_function builtin_mathfn_code (const_tree);
 131 extern tree fold_builtin_expect (location_t, tree, tree, tree, tree);
 132 extern bool avoid_folding_inline_builtin (tree);
 133 extern tree fold_call_expr (location_t, tree, bool);
 134 extern tree fold_builtin_call_array (location_t, tree, tree, int, tree *);
 135 extern bool validate_gimple_arglist (const gcall *, ...);
 136 extern rtx default_expand_builtin (tree, rtx, rtx, machine_mode, int);
 137 extern void maybe_emit_call_builtin___clear_cache (rtx, rtx);
 138 extern bool fold_builtin_next_arg (tree, bool);
 139 extern tree do_mpc_arg2 (tree, tree, tree, int, int (*)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t));
 140 extern tree fold_call_stmt (gcall *, bool);
 141 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 142 extern bool is_simple_builtin (tree);
 143 extern bool is_inexpensive_builtin (tree);
 144 extern bool readonly_data_expr (tree exp);
 145 extern bool init_target_chars (void);
 146 extern unsigned HOST_WIDE_INT target_newline;
 147 extern unsigned HOST_WIDE_INT target_percent;
 148 extern char target_percent_s[3];
 149 extern char target_percent_c[3];
 150 extern char target_percent_s_newline[4];
 151 extern bool target_char_cst_p (tree t, char *p);
 152 extern rtx get_memory_rtx (tree exp, tree len);
 153
 154 extern internal_fn associated_internal_fn (combined_fn, tree);
 155 extern internal_fn associated_internal_fn (tree);
 156 extern internal_fn replacement_internal_fn (gcall *);
 157
 158 extern bool builtin_with_linkage_p (tree);
 159
 160 #endif /* GCC_BUILTINS_H */