1 /* Data structure definitions for a generic GCC target. 2 Copyright (C) 2001-2015 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-modes.h" 52 #include "insn-codes.h" 53 #include "wide-int.h" 54 #include "tm.h" 55 #include "hard-reg-set.h" 56 57 #ifdef ENABLE_CHECKING 58 59 struct cumulative_args_t { void *magic; void *p; }; 60 61 #else /* !ENABLE_CHECKING */ 62 63 /* When using a GCC build compiler, we could use 64 __attribute__((transparent_union)) to get cumulative_args_t function 65 arguments passed like scalars where the ABI would mandate a less 66 efficient way of argument passing otherwise. However, that would come 67 at the cost of less type-safe !ENABLE_CHECKING compilation. */ 68 69 union cumulative_args_t { void *p; }; 70 71 #endif /* !ENABLE_CHECKING */ 72 73 /* Types used by the record_gcc_switches() target function. */ 74 enum print_switch_type 75 { 76 SWITCH_TYPE_PASSED, /* A switch passed on the command line. */ 77 SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */ 78 SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */ 79 SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */ 80 SWITCH_TYPE_LINE_END /* Please emit a line terminator. */ 81 }; 82 83 /* Types of memory operation understood by the "by_pieces" infrastructure. 84 Used by the TARGET_USE_BY_PIECES_INFRASTRUCTURE_P target hook. */ 85 86 enum by_pieces_operation 87 { 88 CLEAR_BY_PIECES, 89 MOVE_BY_PIECES, 90 SET_BY_PIECES, 91 STORE_BY_PIECES 92 }; 93 94 typedef int (* print_switch_fn_type) (print_switch_type, const char *); 95 96 /* An example implementation for ELF targets. Defined in varasm.c */ 97 extern int elf_record_gcc_switches (print_switch_type type, const char *); 98 99 /* Some places still assume that all pointer or address modes are the 100 standard Pmode and ptr_mode. These optimizations become invalid if 101 the target actually supports multiple different modes. For now, 102 we disable such optimizations on such targets, using this function. */ 103 extern bool target_default_pointer_address_modes_p (void); 104 105 /* For hooks which use the MOVE_RATIO macro, this gives the legacy default 106 behaviour. */ 107 extern unsigned int get_move_ratio (bool); 108 109 struct stdarg_info; 110 struct spec_info_def; 111 struct hard_reg_set_container; 112 struct cgraph_node; 113 struct cgraph_simd_clone; 114 115 /* The struct used by the secondary_reload target hook. */ 116 struct secondary_reload_info 117 { 118 /* icode is actually an enum insn_code, but we don't want to force every 119 file that includes target.h to include optabs.h . */ 120 int icode; 121 int extra_cost; /* Cost for using (a) scratch register(s) to be taken 122 into account by copy_cost. */ 123 /* The next two members are for the use of the backward 124 compatibility hook. */ 125 struct secondary_reload_info *prev_sri; 126 int t_icode; /* Actually an enum insn_code - see above. */ 127 }; 128 129 /* This is defined in sched-int.h . */ 130 struct _dep; 131 132 /* This is defined in ddg.h . */ 133 struct ddg; 134 135 /* This is defined in cfgloop.h . */ 136 struct loop; 137 138 /* This is defined in tree-ssa-alias.h. */ 139 struct ao_ref; 140 141 /* This is defined in tree-vectorizer.h. */ 142 struct _stmt_vec_info; 143 144 /* These are defined in tree-vect-stmts.c. */ 145 extern tree stmt_vectype (struct _stmt_vec_info *); 146 extern bool stmt_in_inner_loop_p (struct _stmt_vec_info *); 147 148 /* Assembler instructions for creating various kinds of integer object. */ 149 150 struct asm_int_op 151 { 152 const char *hi; 153 const char *si; 154 const char *di; 155 const char *ti; 156 }; 157 158 /* Types of costs for vectorizer cost model. */ 159 enum vect_cost_for_stmt 160 { 161 scalar_stmt, 162 scalar_load, 163 scalar_store, 164 vector_stmt, 165 vector_load, 166 unaligned_load, 167 unaligned_store, 168 vector_store, 169 vec_to_scalar, 170 scalar_to_vec, 171 cond_branch_not_taken, 172 cond_branch_taken, 173 vec_perm, 174 vec_promote_demote, 175 vec_construct 176 }; 177 178 /* Separate locations for which the vectorizer cost model should 179 track costs. */ 180 enum vect_cost_model_location { 181 vect_prologue = 0, 182 vect_body = 1, 183 vect_epilogue = 2 184 }; 185 186 /* The target structure. This holds all the backend hooks. */ 187 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME; 188 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS; 189 #define DEFHOOK_UNDOC DEFHOOK 190 #define HOOKSTRUCT(FRAGMENT) FRAGMENT 191 192 #include "target.def" 193 194 extern struct gcc_target targetm; 195 196 #ifdef GCC_TM_H 197 198 #ifndef CUMULATIVE_ARGS_MAGIC 199 #define CUMULATIVE_ARGS_MAGIC ((void *) &targetm.calls) 200 #endif 201 202 static inline CUMULATIVE_ARGS * 203 get_cumulative_args (cumulative_args_t arg) 204 { 205 #ifdef ENABLE_CHECKING 206 gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC); 207 #endif /* ENABLE_CHECKING */ 208 return (CUMULATIVE_ARGS *) arg.p; 209 } 210 211 static inline cumulative_args_t 212 pack_cumulative_args (CUMULATIVE_ARGS *arg) 213 { 214 cumulative_args_t ret; 215 216 #ifdef ENABLE_CHECKING 217 ret.magic = CUMULATIVE_ARGS_MAGIC; 218 #endif /* ENABLE_CHECKING */ 219 ret.p = (void *) arg; 220 return ret; 221 } 222 #endif /* GCC_TM_H */ 223 224 #endif /* GCC_TARGET_H */ 225