1 /* Expand builtin functions. 2 Copyright (C) 1988-2020 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 unsigned int get_object_alignment (tree); 56 extern bool get_pointer_alignment_1 (tree, unsigned int *, 57 unsigned HOST_WIDE_INT *); 58 extern unsigned int get_pointer_alignment (tree); 59 extern unsigned string_length (const void*, unsigned, unsigned); 60 61 struct c_strlen_data 62 { 63 /* [MINLEN, MAXBOUND, MAXLEN] is a range describing the length of 64 one or more strings of possibly unknown length. For a single 65 string of known length the range is a constant where 66 MINLEN == MAXBOUND == MAXLEN holds. 67 For other strings, MINLEN is the length of the shortest known 68 string. MAXBOUND is the length of a string that could be stored 69 in the largest array referenced by the expression. MAXLEN is 70 the length of the longest sequence of non-zero bytes 71 in an object referenced by the expression. For such strings, 72 MINLEN <= MAXBOUND <= MAXLEN holds. For example, given: 73 struct A { char a[7], b[]; }; 74 extern struct A *p; 75 n = strlen (p->a); 76 the computed range will be [0, 6, ALL_ONES]. 77 However, for a conditional expression involving a string 78 of known length and an array of unknown bound such as 79 n = strlen (i ? p->b : "123"); 80 the range will be [3, 3, ALL_ONES]. 81 MINLEN != 0 && MAXLEN == ALL_ONES indicates that MINLEN is 82 the length of the shortest known string and implies that 83 the shortest possible string referenced by the expression may 84 actually be the empty string. This distinction is useful for 85 diagnostics. get_range_strlen() return value distinguishes 86 between these two cases. 87 As the tighter (and more optimistic) bound, MAXBOUND is suitable 88 for diagnostics but not for optimization. 89 As the more conservative bound, MAXLEN is intended to be used 90 for optimization. */ 91 tree minlen; 92 tree maxlen; 93 tree maxbound; 94 /* When non-null, DECL refers to the declaration known to store 95 an unterminated constant character array, as in: 96 const char s[] = { 'a', 'b', 'c' }; 97 It is used to diagnose uses of such arrays in functions such as 98 strlen() that expect a nul-terminated string as an argument. */ 99 tree decl; 100 /* Non-constant offset from the beginning of a string not accounted 101 for in the length range. Used to improve diagnostics. */ 102 tree off; 103 }; 104 105 extern tree c_strlen (tree, int, c_strlen_data * = NULL, unsigned = 1); 106 extern rtx c_readstr (const char *, scalar_int_mode, bool = true); 107 extern void expand_builtin_setjmp_setup (rtx, rtx); 108 extern void expand_builtin_setjmp_receiver (rtx); 109 extern void expand_builtin_update_setjmp_buf (rtx); 110 extern tree mathfn_built_in (tree, enum built_in_function fn); 111 extern tree mathfn_built_in (tree, combined_fn); 112 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, scalar_int_mode); 113 extern rtx builtin_memset_read_str (void *, HOST_WIDE_INT, scalar_int_mode); 114 extern rtx expand_builtin_saveregs (void); 115 extern tree std_build_builtin_va_list (void); 116 extern tree std_fn_abi_va_list (tree); 117 extern tree std_canonical_va_list_type (tree); 118 extern void std_expand_builtin_va_start (tree, rtx); 119 extern void expand_builtin_trap (void); 120 extern void expand_ifn_atomic_bit_test_and (gcall *); 121 extern void expand_ifn_atomic_compare_exchange (gcall *); 122 extern rtx expand_builtin (tree, rtx, rtx, machine_mode, int); 123 extern enum built_in_function builtin_mathfn_code (const_tree); 124 extern tree fold_builtin_expect (location_t, tree, tree, tree, tree); 125 extern bool avoid_folding_inline_builtin (tree); 126 extern tree fold_call_expr (location_t, tree, bool); 127 extern tree fold_builtin_call_array (location_t, tree, tree, int, tree *); 128 extern bool validate_gimple_arglist (const gcall *, ...); 129 extern rtx default_expand_builtin (tree, rtx, rtx, machine_mode, int); 130 extern bool fold_builtin_next_arg (tree, bool); 131 extern tree do_mpc_arg2 (tree, tree, tree, int, int (*)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t)); 132 extern tree fold_call_stmt (gcall *, bool); 133 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec); 134 extern bool is_simple_builtin (tree); 135 extern bool is_inexpensive_builtin (tree); 136 137 class vr_values; 138 tree gimple_call_alloc_size (gimple *, wide_int[2] = NULL, 139 const vr_values * = NULL); 140 extern tree compute_objsize (tree, int, tree * = NULL, tree * = NULL, 141 const vr_values * = NULL); 142 143 extern bool readonly_data_expr (tree exp); 144 extern bool init_target_chars (void); 145 extern unsigned HOST_WIDE_INT target_newline; 146 extern unsigned HOST_WIDE_INT target_percent; 147 extern char target_percent_s[3]; 148 extern char target_percent_c[3]; 149 extern char target_percent_s_newline[4]; 150 extern bool target_char_cst_p (tree t, char *p); 151 152 extern internal_fn associated_internal_fn (tree); 153 extern internal_fn replacement_internal_fn (gcall *); 154 155 bool check_nul_terminated_array (tree, tree, tree = NULL_TREE); 156 extern void warn_string_no_nul (location_t, const char *, tree, tree); 157 extern tree unterminated_array (tree, tree * = NULL, bool * = NULL); 158 extern bool builtin_with_linkage_p (tree); 159 extern bool check_access (tree, tree, tree, tree, tree, tree, tree); 160 161 162 #endif /* GCC_BUILTINS_H */ 163