1 /* Data structure definitions for a generic GCC target. 2 Copyright (C) 2001-2013 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 53 #ifdef ENABLE_CHECKING 54 55 typedef struct { void *magic; void *p; } cumulative_args_t; 56 57 #else /* !ENABLE_CHECKING */ 58 59 /* When using a GCC build compiler, we could use 60 __attribute__((transparent_union)) to get cumulative_args_t function 61 arguments passed like scalars where the ABI would mandate a less 62 efficient way of argument passing otherwise. However, that would come 63 at the cost of less type-safe !ENABLE_CHECKING compilation. */ 64 65 typedef union { void *p; } cumulative_args_t; 66 67 #endif /* !ENABLE_CHECKING */ 68 69 /* Types used by the record_gcc_switches() target function. */ 70 typedef enum 71 { 72 SWITCH_TYPE_PASSED, /* A switch passed on the command line. */ 73 SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */ 74 SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */ 75 SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */ 76 SWITCH_TYPE_LINE_END /* Please emit a line terminator. */ 77 } 78 print_switch_type; 79 80 typedef int (* print_switch_fn_type) (print_switch_type, const char *); 81 82 /* An example implementation for ELF targets. Defined in varasm.c */ 83 extern int elf_record_gcc_switches (print_switch_type type, const char *); 84 85 /* Some places still assume that all pointer or address modes are the 86 standard Pmode and ptr_mode. These optimizations become invalid if 87 the target actually supports multiple different modes. For now, 88 we disable such optimizations on such targets, using this function. */ 89 extern bool target_default_pointer_address_modes_p (void); 90 91 struct stdarg_info; 92 struct spec_info_def; 93 struct hard_reg_set_container; 94 95 /* The struct used by the secondary_reload target hook. */ 96 typedef struct secondary_reload_info 97 { 98 /* icode is actually an enum insn_code, but we don't want to force every 99 file that includes target.h to include optabs.h . */ 100 int icode; 101 int extra_cost; /* Cost for using (a) scratch register(s) to be taken 102 into account by copy_cost. */ 103 /* The next two members are for the use of the backward 104 compatibility hook. */ 105 struct secondary_reload_info *prev_sri; 106 int t_icode; /* Actually an enum insn_code - see above. */ 107 } secondary_reload_info; 108 109 /* This is defined in sched-int.h . */ 110 struct _dep; 111 112 /* This is defined in ddg.h . */ 113 struct ddg; 114 115 /* This is defined in cfgloop.h . */ 116 struct loop; 117 118 /* This is defined in tree-ssa-alias.h. */ 119 struct ao_ref_s; 120 121 /* This is defined in tree-vectorizer.h. */ 122 struct _stmt_vec_info; 123 124 /* These are defined in tree-vect-stmts.c. */ 125 extern tree stmt_vectype (struct _stmt_vec_info *); 126 extern bool stmt_in_inner_loop_p (struct _stmt_vec_info *); 127 128 /* Assembler instructions for creating various kinds of integer object. */ 129 130 struct asm_int_op 131 { 132 const char *hi; 133 const char *si; 134 const char *di; 135 const char *ti; 136 }; 137 138 /* Types of costs for vectorizer cost model. */ 139 enum vect_cost_for_stmt 140 { 141 scalar_stmt, 142 scalar_load, 143 scalar_store, 144 vector_stmt, 145 vector_load, 146 unaligned_load, 147 unaligned_store, 148 vector_store, 149 vec_to_scalar, 150 scalar_to_vec, 151 cond_branch_not_taken, 152 cond_branch_taken, 153 vec_perm, 154 vec_promote_demote, 155 vec_construct 156 }; 157 158 /* Separate locations for which the vectorizer cost model should 159 track costs. */ 160 enum vect_cost_model_location { 161 vect_prologue = 0, 162 vect_body = 1, 163 vect_epilogue = 2 164 }; 165 166 /* The target structure. This holds all the backend hooks. */ 167 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME; 168 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS; 169 #define DEFHOOK_UNDOC DEFHOOK 170 #define HOOKSTRUCT(FRAGMENT) FRAGMENT 171 172 #include "target.def" 173 174 extern struct gcc_target targetm; 175 176 #ifdef GCC_TM_H 177 178 #ifndef CUMULATIVE_ARGS_MAGIC 179 #define CUMULATIVE_ARGS_MAGIC ((void *) &targetm.calls) 180 #endif 181 182 static inline CUMULATIVE_ARGS * 183 get_cumulative_args (cumulative_args_t arg) 184 { 185 #ifdef ENABLE_CHECKING 186 gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC); 187 #endif /* ENABLE_CHECKING */ 188 return (CUMULATIVE_ARGS *) arg.p; 189 } 190 191 static inline cumulative_args_t 192 pack_cumulative_args (CUMULATIVE_ARGS *arg) 193 { 194 cumulative_args_t ret; 195 196 #ifdef ENABLE_CHECKING 197 ret.magic = CUMULATIVE_ARGS_MAGIC; 198 #endif /* ENABLE_CHECKING */ 199 ret.p = (void *) arg; 200 return ret; 201 } 202 #endif /* GCC_TM_H */ 203 204 #endif /* GCC_TARGET_H */ 205
