1 /* Data structure definitions for a generic GCC target. 2 Copyright (C) 2001-2018 Free Software Foundation, Inc. 3 4 This program is free software; you can redistribute it and/or modify it 5 under the terms of the GNU General Public License as published by the 6 Free Software Foundation; either version 3, or (at your option) any 7 later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; see the file COPYING3. If not see 16 <http://www.gnu.org/licenses/>. 17 18 In other words, you are welcome to use, share and improve this program. 19 You are forbidden to forbid anyone else to use, share and improve 20 what you give them. Help stamp out software-hoarding! */ 21 22 23 /* This file contains a data structure that describes a GCC target. 24 At present it is incomplete, but in future it should grow to 25 contain most or all target machine and target O/S specific 26 information. 27 28 This structure has its initializer declared in target-def.h in the 29 form of large macro TARGET_INITIALIZER that expands to many smaller 30 macros. 31 32 The smaller macros each initialize one component of the structure, 33 and each has a default. Each target should have a file that 34 includes target.h and target-def.h, and overrides any inappropriate 35 defaults by undefining the relevant macro and defining a suitable 36 replacement. That file should then contain the definition of 37 "targetm" like so: 38 39 struct gcc_target targetm = TARGET_INITIALIZER; 40 41 Doing things this way allows us to bring together everything that 42 defines a GCC target. By supplying a default that is appropriate 43 to most targets, we can easily add new items without needing to 44 edit dozens of target configuration files. It should also allow us 45 to gradually reduce the amount of conditional compilation that is 46 scattered throughout GCC. */ 47 48 #ifndef GCC_TARGET_H 49 #define GCC_TARGET_H 50 51 #include "insn-codes.h" 52 #include "tm.h" 53 #include "hard-reg-set.h" 54 55 #if CHECKING_P 56 57 struct cumulative_args_t { void *magic; void *p; }; 58 59 #else /* !CHECKING_P */ 60 61 /* When using a GCC build compiler, we could use 62 __attribute__((transparent_union)) to get cumulative_args_t function 63 arguments passed like scalars where the ABI would mandate a less 64 efficient way of argument passing otherwise. However, that would come 65 at the cost of less type-safe !CHECKING_P compilation. */ 66 67 union cumulative_args_t { void *p; }; 68 69 #endif /* !CHECKING_P */ 70 71 /* Types used by the record_gcc_switches() target function. */ 72 enum print_switch_type 73 { 74 SWITCH_TYPE_PASSED, /* A switch passed on the command line. */ 75 SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */ 76 SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */ 77 SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */ 78 SWITCH_TYPE_LINE_END /* Please emit a line terminator. */ 79 }; 80 81 /* Types of memory operation understood by the "by_pieces" infrastructure. 82 Used by the TARGET_USE_BY_PIECES_INFRASTRUCTURE_P target hook and 83 internally by the functions in expr.c. */ 84 85 enum by_pieces_operation 86 { 87 CLEAR_BY_PIECES, 88 MOVE_BY_PIECES, 89 SET_BY_PIECES, 90 STORE_BY_PIECES, 91 COMPARE_BY_PIECES 92 }; 93 94 extern unsigned HOST_WIDE_INT by_pieces_ninsns (unsigned HOST_WIDE_INT, 95 unsigned int, 96 unsigned int, 97 by_pieces_operation); 98 99 typedef int (* print_switch_fn_type) (print_switch_type, const char *); 100 101 /* An example implementation for ELF targets. Defined in varasm.c */ 102 extern int elf_record_gcc_switches (print_switch_type type, const char *); 103 104 /* Some places still assume that all pointer or address modes are the 105 standard Pmode and ptr_mode. These optimizations become invalid if 106 the target actually supports multiple different modes. For now, 107 we disable such optimizations on such targets, using this function. */ 108 extern bool target_default_pointer_address_modes_p (void); 109 110 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default 111 behavior. */ 112 extern unsigned int get_move_ratio (bool); 113 114 struct stdarg_info; 115 struct spec_info_def; 116 struct hard_reg_set_container; 117 struct cgraph_node; 118 struct cgraph_simd_clone; 119 120 /* The struct used by the secondary_reload target hook. */ 121 struct secondary_reload_info 122 { 123 /* icode is actually an enum insn_code, but we don't want to force every 124 file that includes target.h to include optabs.h . */ 125 int icode; 126 int extra_cost; /* Cost for using (a) scratch register(s) to be taken 127 into account by copy_cost. */ 128 /* The next two members are for the use of the backward 129 compatibility hook. */ 130 struct secondary_reload_info *prev_sri; 131 int t_icode; /* Actually an enum insn_code - see above. */ 132 }; 133 134 /* This is defined in sched-int.h . */ 135 struct _dep; 136 137 /* This is defined in ddg.h . */ 138 struct ddg; 139 140 /* This is defined in cfgloop.h . */ 141 struct loop; 142 143 /* This is defined in ifcvt.h. */ 144 struct noce_if_info; 145 146 /* This is defined in tree-ssa-alias.h. */ 147 struct ao_ref; 148 149 /* This is defined in tree-vectorizer.h. */ 150 struct _stmt_vec_info; 151 152 /* These are defined in tree-vect-stmts.c. */ 153 extern tree stmt_vectype (struct _stmt_vec_info *); 154 extern bool stmt_in_inner_loop_p (struct _stmt_vec_info *); 155 156 /* Assembler instructions for creating various kinds of integer object. */ 157 158 struct asm_int_op 159 { 160 const char *hi; 161 const char *si; 162 const char *di; 163 const char *ti; 164 }; 165 166 /* Types of costs for vectorizer cost model. */ 167 enum vect_cost_for_stmt 168 { 169 scalar_stmt, 170 scalar_load, 171 scalar_store, 172 vector_stmt, 173 vector_load, 174 vector_gather_load, 175 unaligned_load, 176 unaligned_store, 177 vector_store, 178 vector_scatter_store, 179 vec_to_scalar, 180 scalar_to_vec, 181 cond_branch_not_taken, 182 cond_branch_taken, 183 vec_perm, 184 vec_promote_demote, 185 vec_construct 186 }; 187 188 /* Separate locations for which the vectorizer cost model should 189 track costs. */ 190 enum vect_cost_model_location { 191 vect_prologue = 0, 192 vect_body = 1, 193 vect_epilogue = 2 194 }; 195 196 class vec_perm_indices; 197 198 /* The type to use for lists of vector sizes. */ 199 typedef vec<poly_uint64> vector_sizes; 200 201 /* Same, but can be used to construct local lists that are 202 automatically freed. */ 203 typedef auto_vec<poly_uint64, 8> auto_vector_sizes; 204 205 /* The target structure. This holds all the backend hooks. */ 206 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME; 207 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS; 208 #define DEFHOOK_UNDOC DEFHOOK 209 #define HOOKSTRUCT(FRAGMENT) FRAGMENT 210 211 #include "target.def" 212 213 extern struct gcc_target targetm; 214 215 /* Return an estimate of the runtime value of X, for use in things 216 like cost calculations or profiling frequencies. Note that this 217 function should never be used in situations where the actual 218 runtime value is needed for correctness, since the function only 219 provides a rough guess. */ 220 221 static inline HOST_WIDE_INT 222 estimated_poly_value (poly_int64 x) 223 { 224 if (NUM_POLY_INT_COEFFS == 1) 225 return x.coeffs[0]; 226 else 227 return targetm.estimated_poly_value (x); 228 } 229 230 #ifdef GCC_TM_H 231 232 #ifndef CUMULATIVE_ARGS_MAGIC 233 #define CUMULATIVE_ARGS_MAGIC ((void *) &targetm.calls) 234 #endif 235 236 static inline CUMULATIVE_ARGS * 237 get_cumulative_args (cumulative_args_t arg) 238 { 239 #if CHECKING_P 240 gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC); 241 #endif /* CHECKING_P */ 242 return (CUMULATIVE_ARGS *) arg.p; 243 } 244 245 static inline cumulative_args_t 246 pack_cumulative_args (CUMULATIVE_ARGS *arg) 247 { 248 cumulative_args_t ret; 249 250 #if CHECKING_P 251 ret.magic = CUMULATIVE_ARGS_MAGIC; 252 #endif /* CHECKING_P */ 253 ret.p = (void *) arg; 254 return ret; 255 } 256 #endif /* GCC_TM_H */ 257 258 #endif /* GCC_TARGET_H */ 259