1/* Data structure definitions for a generic GCC target. 2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 3 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify it 6 under the terms of the GNU General Public License as published by the 7 Free Software Foundation; either version 3, or (at your option) any 8 later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; see the file COPYING3. If not see 17 <http://www.gnu.org/licenses/>. 18 19 In other words, you are welcome to use, share and improve this program. 20 You are forbidden to forbid anyone else to use, share and improve 21 what you give them. Help stamp out software-hoarding! */ 22 23 24/* This file contains a data structure that describes a GCC target. 25 At present it is incomplete, but in future it should grow to 26 contain most or all target machine and target O/S specific 27 information. 28 29 This structure has its initializer declared in target-def.h in the 30 form of large macro TARGET_INITIALIZER that expands to many smaller 31 macros. 32 33 The smaller macros each initialize one component of the structure, 34 and each has a default. Each target should have a file that 35 includes target.h and target-def.h, and overrides any inappropriate 36 defaults by undefining the relevant macro and defining a suitable 37 replacement. That file should then contain the definition of 38 "targetm" like so: 39 40 struct gcc_target targetm = TARGET_INITIALIZER; 41 42 Doing things this way allows us to bring together everything that 43 defines a GCC target. By supplying a default that is appropriate 44 to most targets, we can easily add new items without needing to 45 edit dozens of target configuration files. It should also allow us 46 to gradually reduce the amount of conditional compilation that is 47 scattered throughout GCC. */ 48 49#ifndef GCC_TARGET_H 50#define GCC_TARGET_H 51 52#include "tm.h" 53#include "insn-modes.h" 54 55/* Types used by the record_gcc_switches() target function. */ 56typedef enum 57{ 58 SWITCH_TYPE_PASSED, /* A switch passed on the command line. */ 59 SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */ 60 SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */ 61 SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */ 62 SWITCH_TYPE_LINE_END /* Please emit a line terminator. */ 63} 64print_switch_type; 65 66typedef int (* print_switch_fn_type) (print_switch_type, const char *); 67 68/* An example implementation for ELF targets. Defined in varasm.c */ 69extern int elf_record_gcc_switches (print_switch_type type, const char *); 70 71/* Some places still assume that all pointer or address modes are the 72 standard Pmode and ptr_mode. These optimizations become invalid if 73 the target actually supports multiple different modes. For now, 74 we disable such optimizations on such targets, using this function. */ 75extern bool target_default_pointer_address_modes_p (void); 76 77struct stdarg_info; 78struct spec_info_def; 79 80/* The struct used by the secondary_reload target hook. */ 81typedef struct secondary_reload_info 82{ 83 /* icode is actually an enum insn_code, but we don't want to force every 84 file that includes target.h to include optabs.h . */ 85 int icode; 86 int extra_cost; /* Cost for using (a) scratch register(s) to be taken 87 into account by copy_cost. */ 88 /* The next two members are for the use of the backward 89 compatibility hook. */ 90 struct secondary_reload_info *prev_sri; 91 int t_icode; /* Actually an enum insn_code - see above. */ 92} secondary_reload_info; 93 94/* This is defined in sched-int.h . */ 95struct _dep; 96 97/* This is defined in ddg.h . */ 98struct ddg; 99 100/* This is defined in cfgloop.h . */ 101struct loop; 102 103/* This is defined in tree-ssa-alias.h. */ 104struct ao_ref_s; 105 106/* Assembler instructions for creating various kinds of integer object. */ 107 108struct asm_int_op 109{ 110 const char *hi; 111 const char *si; 112 const char *di; 113 const char *ti; 114}; 115 116/* Types of costs for vectorizer cost model. */ 117enum vect_cost_for_stmt 118{ 119 scalar_stmt, 120 scalar_load, 121 scalar_store, 122 vector_stmt, 123 vector_load, 124 unaligned_load, 125 unaligned_store, 126 vector_store, 127 vec_to_scalar, 128 scalar_to_vec, 129 cond_branch_not_taken, 130 cond_branch_taken, 131 vec_perm 132}; 133 134/* Sets of optimization levels at which an option may be enabled by 135 default_options_optimization. */ 136enum opt_levels 137{ 138 OPT_LEVELS_NONE, /* No levels (mark end of array). */ 139 OPT_LEVELS_ALL, /* All levels (used by targets to disable options 140 enabled in target-independent code). */ 141 OPT_LEVELS_0_ONLY, /* -O0 only. */ 142 OPT_LEVELS_1_PLUS, /* -O1 and above, including -Os. */ 143 OPT_LEVELS_1_PLUS_SPEED_ONLY, /* -O1 and above, but not -Os. */ 144 OPT_LEVELS_2_PLUS, /* -O2 and above, including -Os. */ 145 OPT_LEVELS_2_PLUS_SPEED_ONLY, /* -O2 and above, but not -Os. */ 146 OPT_LEVELS_3_PLUS, /* -O3 and above. */ 147 OPT_LEVELS_3_PLUS_AND_SIZE, /* -O3 and above and -Os. */ 148 OPT_LEVELS_SIZE, /* -Os only. */ 149 OPT_LEVELS_FAST /* -Ofast only. */ 150}; 151 152/* Description of options to enable by default at given levels. */ 153struct default_options 154{ 155 /* The levels at which to enable the option. */ 156 enum opt_levels levels; 157 158 /* The option index and argument or enabled/disabled sense of the 159 option, as passed to handle_generated_option. If ARG is NULL and 160 the option allows a negative form, the option is considered to be 161 passed in negative form when the optimization level is not one of 162 those in LEVELS (in order to handle changes to the optimization 163 level with the "optimize" attribute). */ 164 size_t opt_index; 165 const char *arg; 166 int value; 167}; 168 169/* The target structure. This holds all the backend hooks. */ 170#define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME; 171#define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS; 172#define DEFHOOK_UNDOC DEFHOOK 173#define HOOKSTRUCT(FRAGMENT) FRAGMENT 174 175#include "target.def" 176 177extern struct gcc_target targetm; 178 179/* Each target can provide their own. */ 180extern struct gcc_targetcm targetcm; 181 182#endif /* GCC_TARGET_H */ 183