1 /* Data structure definitions for a generic GCC target. 2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 3 2011, 2012 4 Free Software Foundation, Inc. 5 6 This program is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published by the 8 Free Software Foundation; either version 3, or (at your option) any 9 later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. 19 20 In other words, you are welcome to use, share and improve this program. 21 You are forbidden to forbid anyone else to use, share and improve 22 what you give them. Help stamp out software-hoarding! */ 23 24 25 /* This file contains a data structure that describes a GCC target. 26 At present it is incomplete, but in future it should grow to 27 contain most or all target machine and target O/S specific 28 information. 29 30 This structure has its initializer declared in target-def.h in the 31 form of large macro TARGET_INITIALIZER that expands to many smaller 32 macros. 33 34 The smaller macros each initialize one component of the structure, 35 and each has a default. Each target should have a file that 36 includes target.h and target-def.h, and overrides any inappropriate 37 defaults by undefining the relevant macro and defining a suitable 38 replacement. That file should then contain the definition of 39 "targetm" like so: 40 41 struct gcc_target targetm = TARGET_INITIALIZER; 42 43 Doing things this way allows us to bring together everything that 44 defines a GCC target. By supplying a default that is appropriate 45 to most targets, we can easily add new items without needing to 46 edit dozens of target configuration files. It should also allow us 47 to gradually reduce the amount of conditional compilation that is 48 scattered throughout GCC. */ 49 50 #ifndef GCC_TARGET_H 51 #define GCC_TARGET_H 52 53 #include "insn-modes.h" 54 55 #ifdef ENABLE_CHECKING 56 57 typedef struct { void *magic; void *p; } cumulative_args_t; 58 59 #else /* !ENABLE_CHECKING */ 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 !ENABLE_CHECKING compilation. */ 66 67 typedef union { void *p; } cumulative_args_t; 68 69 #endif /* !ENABLE_CHECKING */ 70 71 /* Types used by the record_gcc_switches() target function. */ 72 typedef enum 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 print_switch_type; 81 82 typedef int (* print_switch_fn_type) (print_switch_type, const char *); 83 84 /* An example implementation for ELF targets. Defined in varasm.c */ 85 extern int elf_record_gcc_switches (print_switch_type type, const char *); 86 87 /* Some places still assume that all pointer or address modes are the 88 standard Pmode and ptr_mode. These optimizations become invalid if 89 the target actually supports multiple different modes. For now, 90 we disable such optimizations on such targets, using this function. */ 91 extern bool target_default_pointer_address_modes_p (void); 92 93 struct stdarg_info; 94 struct spec_info_def; 95 struct hard_reg_set_container; 96 97 /* The struct used by the secondary_reload target hook. */ 98 typedef struct secondary_reload_info 99 { 100 /* icode is actually an enum insn_code, but we don't want to force every 101 file that includes target.h to include optabs.h . */ 102 int icode; 103 int extra_cost; /* Cost for using (a) scratch register(s) to be taken 104 into account by copy_cost. */ 105 /* The next two members are for the use of the backward 106 compatibility hook. */ 107 struct secondary_reload_info *prev_sri; 108 int t_icode; /* Actually an enum insn_code - see above. */ 109 } secondary_reload_info; 110 111 /* This is defined in sched-int.h . */ 112 struct _dep; 113 114 /* This is defined in ddg.h . */ 115 struct ddg; 116 117 /* This is defined in cfgloop.h . */ 118 struct loop; 119 120 /* This is defined in tree-ssa-alias.h. */ 121 struct ao_ref_s; 122 123 /* Assembler instructions for creating various kinds of integer object. */ 124 125 struct asm_int_op 126 { 127 const char *hi; 128 const char *si; 129 const char *di; 130 const char *ti; 131 }; 132 133 /* Types of costs for vectorizer cost model. */ 134 enum vect_cost_for_stmt 135 { 136 scalar_stmt, 137 scalar_load, 138 scalar_store, 139 vector_stmt, 140 vector_load, 141 unaligned_load, 142 unaligned_store, 143 vector_store, 144 vec_to_scalar, 145 scalar_to_vec, 146 cond_branch_not_taken, 147 cond_branch_taken, 148 vec_perm, 149 vec_promote_demote 150 }; 151 152 /* The target structure. This holds all the backend hooks. */ 153 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME; 154 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS; 155 #define DEFHOOK_UNDOC DEFHOOK 156 #define HOOKSTRUCT(FRAGMENT) FRAGMENT 157 158 #include "target.def" 159 160 extern struct gcc_target targetm; 161 162 #ifdef GCC_TM_H 163 164 #ifndef CUMULATIVE_ARGS_MAGIC 165 #define CUMULATIVE_ARGS_MAGIC ((void *) &targetm.calls) 166 #endif 167 168 static inline CUMULATIVE_ARGS * 169 get_cumulative_args (cumulative_args_t arg) 170 { 171 #ifdef ENABLE_CHECKING 172 gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC); 173 #endif /* ENABLE_CHECKING */ 174 return (CUMULATIVE_ARGS *) arg.p; 175 } 176 177 static inline cumulative_args_t 178 pack_cumulative_args (CUMULATIVE_ARGS *arg) 179 { 180 cumulative_args_t ret; 181 182 #ifdef ENABLE_CHECKING 183 ret.magic = CUMULATIVE_ARGS_MAGIC; 184 #endif /* ENABLE_CHECKING */ 185 ret.p = (void *) arg; 186 return ret; 187 } 188 #endif /* GCC_TM_H */ 189 190 #endif /* GCC_TARGET_H */ 191