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annotate gcc/target.h @ 67:f6334be47118

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update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
author nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 22 Mar 2011 17:18:12 +0900
parents b7f97abdc517
children 04ced10e8804
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1 /* Data structure definitions for a generic GCC target.
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2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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3 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify it
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6 under the terms of the GNU General Public License as published by the
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7 Free Software Foundation; either version 3, or (at your option) any
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8 later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; see the file COPYING3. If not see
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17 <http://www.gnu.org/licenses/>.
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18
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19 In other words, you are welcome to use, share and improve this program.
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20 You are forbidden to forbid anyone else to use, share and improve
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21 what you give them. Help stamp out software-hoarding! */
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22
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23
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24 /* This file contains a data structure that describes a GCC target.
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25 At present it is incomplete, but in future it should grow to
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26 contain most or all target machine and target O/S specific
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27 information.
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28
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29 This structure has its initializer declared in target-def.h in the
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30 form of large macro TARGET_INITIALIZER that expands to many smaller
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31 macros.
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32
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33 The smaller macros each initialize one component of the structure,
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34 and each has a default. Each target should have a file that
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35 includes target.h and target-def.h, and overrides any inappropriate
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36 defaults by undefining the relevant macro and defining a suitable
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37 replacement. That file should then contain the definition of
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38 "targetm" like so:
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39
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40 struct gcc_target targetm = TARGET_INITIALIZER;
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41
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42 Doing things this way allows us to bring together everything that
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43 defines a GCC target. By supplying a default that is appropriate
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44 to most targets, we can easily add new items without needing to
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45 edit dozens of target configuration files. It should also allow us
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46 to gradually reduce the amount of conditional compilation that is
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47 scattered throughout GCC. */
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48
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49 #ifndef GCC_TARGET_H
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50 #define GCC_TARGET_H
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51
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52 #include "tm.h"
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53 #include "insn-modes.h"
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54
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55 /* Types used by the record_gcc_switches() target function. */
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56 typedef enum
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57 {
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58 SWITCH_TYPE_PASSED, /* A switch passed on the command line. */
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59 SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */
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60 SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */
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61 SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */
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62 SWITCH_TYPE_LINE_END /* Please emit a line terminator. */
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63 }
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64 print_switch_type;
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65
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66 typedef int (* print_switch_fn_type) (print_switch_type, const char *);
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67
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68 /* An example implementation for ELF targets. Defined in varasm.c */
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69 extern int elf_record_gcc_switches (print_switch_type type, const char *);
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70
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71 /* Some places still assume that all pointer or address modes are the
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72 standard Pmode and ptr_mode. These optimizations become invalid if
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73 the target actually supports multiple different modes. For now,
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74 we disable such optimizations on such targets, using this function. */
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75 extern bool target_default_pointer_address_modes_p (void);
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76
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77 struct stdarg_info;
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78 struct spec_info_def;
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79
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80 /* The struct used by the secondary_reload target hook. */
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81 typedef struct secondary_reload_info
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82 {
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83 /* icode is actually an enum insn_code, but we don't want to force every
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84 file that includes target.h to include optabs.h . */
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85 int icode;
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86 int extra_cost; /* Cost for using (a) scratch register(s) to be taken
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87 into account by copy_cost. */
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88 /* The next two members are for the use of the backward
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89 compatibility hook. */
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90 struct secondary_reload_info *prev_sri;
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91 int t_icode; /* Actually an enum insn_code - see above. */
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92 } secondary_reload_info;
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93
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94 /* This is defined in sched-int.h . */
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95 struct _dep;
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96
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97 /* This is defined in ddg.h . */
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98 struct ddg;
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99
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100 /* This is defined in cfgloop.h . */
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101 struct loop;
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102
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103 /* This is defined in tree-ssa-alias.h. */
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104 struct ao_ref_s;
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105
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106 /* Assembler instructions for creating various kinds of integer object. */
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107
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108 struct asm_int_op
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109 {
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110 const char *hi;
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111 const char *si;
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112 const char *di;
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113 const char *ti;
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114 };
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115
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116 /* Types of costs for vectorizer cost model. */
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117 enum vect_cost_for_stmt
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118 {
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119 scalar_stmt,
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120 scalar_load,
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121 scalar_store,
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122 vector_stmt,
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123 vector_load,
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124 unaligned_load,
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125 unaligned_store,
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126 vector_store,
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127 vec_to_scalar,
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128 scalar_to_vec,
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129 cond_branch_not_taken,
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130 cond_branch_taken,
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131 vec_perm
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132 };
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133
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134 /* Sets of optimization levels at which an option may be enabled by
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135 default_options_optimization. */
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136 enum opt_levels
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137 {
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138 OPT_LEVELS_NONE, /* No levels (mark end of array). */
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139 OPT_LEVELS_ALL, /* All levels (used by targets to disable options
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140 enabled in target-independent code). */
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141 OPT_LEVELS_0_ONLY, /* -O0 only. */
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142 OPT_LEVELS_1_PLUS, /* -O1 and above, including -Os. */
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143 OPT_LEVELS_1_PLUS_SPEED_ONLY, /* -O1 and above, but not -Os. */
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144 OPT_LEVELS_2_PLUS, /* -O2 and above, including -Os. */
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145 OPT_LEVELS_2_PLUS_SPEED_ONLY, /* -O2 and above, but not -Os. */
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146 OPT_LEVELS_3_PLUS, /* -O3 and above. */
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147 OPT_LEVELS_3_PLUS_AND_SIZE, /* -O3 and above and -Os. */
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148 OPT_LEVELS_SIZE, /* -Os only. */
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149 OPT_LEVELS_FAST /* -Ofast only. */
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150 };
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151
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152 /* Description of options to enable by default at given levels. */
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153 struct default_options
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154 {
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155 /* The levels at which to enable the option. */
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156 enum opt_levels levels;
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157
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158 /* The option index and argument or enabled/disabled sense of the
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159 option, as passed to handle_generated_option. If ARG is NULL and
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160 the option allows a negative form, the option is considered to be
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161 passed in negative form when the optimization level is not one of
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162 those in LEVELS (in order to handle changes to the optimization
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163 level with the "optimize" attribute). */
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164 size_t opt_index;
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165 const char *arg;
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166 int value;
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167 };
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168
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169 /* The target structure. This holds all the backend hooks. */
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170 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME;
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171 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS;
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172 #define DEFHOOK_UNDOC DEFHOOK
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173 #define HOOKSTRUCT(FRAGMENT) FRAGMENT
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174
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175 #include "target.def"
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176
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177 extern struct gcc_target targetm;
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178
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179 /* Each target can provide their own. */
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180 extern struct gcc_targetcm targetcm;
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181
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182 #endif /* GCC_TARGET_H */