1 /* Generate attribute information (insn-attr.h) from machine description. 2 Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008 3 Free Software Foundation, Inc. 4 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu) 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 23 #include "bconfig.h" 24 #include "system.h" 25 #include "coretypes.h" 26 #include "tm.h" 27 #include "rtl.h" 28 #include "errors.h" 29 #include "gensupport.h" 30 31 32 static void write_upcase (const char *); 33 static void gen_attr (rtx); 34 35 static void 36 write_upcase (const char *str) 37 { 38 for (; *str; str++) 39 putchar (TOUPPER(*str)); 40 } 41 42 static void 43 gen_attr (rtx attr) 44 { 45 const char *p, *tag; 46 int is_const = GET_CODE (XEXP (attr, 2)) == CONST; 47 48 printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0)); 49 50 /* If numeric attribute, don't need to write an enum. */ 51 p = XSTR (attr, 1); 52 if (*p == '\0') 53 printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0), 54 (is_const ? "void" : "rtx")); 55 else 56 { 57 printf ("enum attr_%s {", XSTR (attr, 0)); 58 59 while ((tag = scan_comma_elt (&p)) != 0) 60 { 61 write_upcase (XSTR (attr, 0)); 62 putchar ('_'); 63 while (tag != p) 64 putchar (TOUPPER (*tag++)); 65 if (*p == ',') 66 fputs (", ", stdout); 67 } 68 69 fputs ("};\n", stdout); 70 printf ("extern enum attr_%s get_attr_%s (%s);\n\n", 71 XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx")); 72 } 73 74 /* If `length' attribute, write additional function definitions and define 75 variables used by `insn_current_length'. */ 76 if (! strcmp (XSTR (attr, 0), "length")) 77 { 78 puts ("\ 79 extern void shorten_branches (rtx);\n\ 80 extern int insn_default_length (rtx);\n\ 81 extern int insn_min_length (rtx);\n\ 82 extern int insn_variable_length_p (rtx);\n\ 83 extern int insn_current_length (rtx);\n\n\ 84 #include \"insn-addr.h\"\n"); 85 } 86 } 87 88 int 89 main (int argc, char **argv) 90 { 91 rtx desc; 92 int have_delay = 0; 93 int have_annul_true = 0; 94 int have_annul_false = 0; 95 int num_insn_reservations = 0; 96 int i; 97 98 progname = "genattr"; 99 100 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE) 101 return (FATAL_EXIT_CODE); 102 103 puts ("/* Generated automatically by the program `genattr'"); 104 puts (" from the machine description file `md'. */\n"); 105 puts ("#ifndef GCC_INSN_ATTR_H"); 106 puts ("#define GCC_INSN_ATTR_H\n"); 107 108 /* For compatibility, define the attribute `alternative', which is just 109 a reference to the variable `which_alternative'. */ 110 111 puts ("#define HAVE_ATTR_alternative"); 112 puts ("#define get_attr_alternative(insn) which_alternative"); 113 114 /* Read the machine description. */ 115 116 while (1) 117 { 118 int line_no, insn_code_number; 119 120 desc = read_md_rtx (&line_no, &insn_code_number); 121 if (desc == NULL) 122 break; 123 124 if (GET_CODE (desc) == DEFINE_ATTR) 125 gen_attr (desc); 126 127 else if (GET_CODE (desc) == DEFINE_DELAY) 128 { 129 if (! have_delay) 130 { 131 printf ("#define DELAY_SLOTS\n"); 132 printf ("extern int num_delay_slots (rtx);\n"); 133 printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n"); 134 printf ("extern int const_num_delay_slots (rtx);\n\n"); 135 have_delay = 1; 136 } 137 138 for (i = 0; i < XVECLEN (desc, 1); i += 3) 139 { 140 if (XVECEXP (desc, 1, i + 1) && ! have_annul_true) 141 { 142 printf ("#define ANNUL_IFTRUE_SLOTS\n"); 143 printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n"); 144 have_annul_true = 1; 145 } 146 147 if (XVECEXP (desc, 1, i + 2) && ! have_annul_false) 148 { 149 printf ("#define ANNUL_IFFALSE_SLOTS\n"); 150 printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n"); 151 have_annul_false = 1; 152 } 153 } 154 } 155 156 else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION) 157 num_insn_reservations++; 158 } 159 160 if (num_insn_reservations > 0) 161 { 162 /* Output interface for pipeline hazards recognition based on 163 DFA (deterministic finite state automata. */ 164 printf ("\n#define INSN_SCHEDULING\n"); 165 printf ("\n/* DFA based pipeline interface. */"); 166 printf ("\n#ifndef AUTOMATON_ALTS\n"); 167 printf ("#define AUTOMATON_ALTS 0\n"); 168 printf ("#endif\n\n"); 169 printf ("\n#ifndef AUTOMATON_STATE_ALTS\n"); 170 printf ("#define AUTOMATON_STATE_ALTS 0\n"); 171 printf ("#endif\n\n"); 172 printf ("#ifndef CPU_UNITS_QUERY\n"); 173 printf ("#define CPU_UNITS_QUERY 0\n"); 174 printf ("#endif\n\n"); 175 /* Interface itself: */ 176 printf ("/* Internal insn code number used by automata. */\n"); 177 printf ("extern int internal_dfa_insn_code (rtx);\n\n"); 178 printf ("/* Insn latency time defined in define_insn_reservation. */\n"); 179 printf ("extern int insn_default_latency (rtx);\n\n"); 180 printf ("/* Return nonzero if there is a bypass for given insn\n"); 181 printf (" which is a data producer. */\n"); 182 printf ("extern int bypass_p (rtx);\n\n"); 183 printf ("/* Insn latency time on data consumed by the 2nd insn.\n"); 184 printf (" Use the function if bypass_p returns nonzero for\n"); 185 printf (" the 1st insn. */\n"); 186 printf ("extern int insn_latency (rtx, rtx);\n\n"); 187 printf ("/* Maximal insn latency time possible of all bypasses for this insn.\n"); 188 printf (" Use the function if bypass_p returns nonzero for\n"); 189 printf (" the 1st insn. */\n"); 190 printf ("extern int maximal_insn_latency (rtx);\n\n"); 191 printf ("\n#if AUTOMATON_ALTS\n"); 192 printf ("/* The following function returns number of alternative\n"); 193 printf (" reservations of given insn. It may be used for better\n"); 194 printf (" insns scheduling heuristics. */\n"); 195 printf ("extern int insn_alts (rtx);\n\n"); 196 printf ("#endif\n\n"); 197 printf ("/* Maximal possible number of insns waiting results being\n"); 198 printf (" produced by insns whose execution is not finished. */\n"); 199 printf ("extern const int max_insn_queue_index;\n\n"); 200 printf ("/* Pointer to data describing current state of DFA. */\n"); 201 printf ("typedef void *state_t;\n\n"); 202 printf ("/* Size of the data in bytes. */\n"); 203 printf ("extern int state_size (void);\n\n"); 204 printf ("/* Initiate given DFA state, i.e. Set up the state\n"); 205 printf (" as all functional units were not reserved. */\n"); 206 printf ("extern void state_reset (state_t);\n"); 207 printf ("/* The following function returns negative value if given\n"); 208 printf (" insn can be issued in processor state described by given\n"); 209 printf (" DFA state. In this case, the DFA state is changed to\n"); 210 printf (" reflect the current and future reservations by given\n"); 211 printf (" insn. Otherwise the function returns minimal time\n"); 212 printf (" delay to issue the insn. This delay may be zero\n"); 213 printf (" for superscalar or VLIW processors. If the second\n"); 214 printf (" parameter is NULL the function changes given DFA state\n"); 215 printf (" as new processor cycle started. */\n"); 216 printf ("extern int state_transition (state_t, rtx);\n"); 217 printf ("\n#if AUTOMATON_STATE_ALTS\n"); 218 printf ("/* The following function returns number of possible\n"); 219 printf (" alternative reservations of given insn in given\n"); 220 printf (" DFA state. It may be used for better insns scheduling\n"); 221 printf (" heuristics. By default the function is defined if\n"); 222 printf (" macro AUTOMATON_STATE_ALTS is defined because its\n"); 223 printf (" implementation may require much memory. */\n"); 224 printf ("extern int state_alts (state_t, rtx);\n"); 225 printf ("#endif\n\n"); 226 printf ("extern int min_issue_delay (state_t, rtx);\n"); 227 printf ("/* The following function returns nonzero if no one insn\n"); 228 printf (" can be issued in current DFA state. */\n"); 229 printf ("extern int state_dead_lock_p (state_t);\n"); 230 printf ("/* The function returns minimal delay of issue of the 2nd\n"); 231 printf (" insn after issuing the 1st insn in given DFA state.\n"); 232 printf (" The 1st insn should be issued in given state (i.e.\n"); 233 printf (" state_transition should return negative value for\n"); 234 printf (" the insn and the state). Data dependencies between\n"); 235 printf (" the insns are ignored by the function. */\n"); 236 printf 237 ("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n"); 238 printf ("/* The following function outputs reservations for given\n"); 239 printf (" insn as they are described in the corresponding\n"); 240 printf (" define_insn_reservation. */\n"); 241 printf ("extern void print_reservation (FILE *, rtx);\n"); 242 printf ("\n#if CPU_UNITS_QUERY\n"); 243 printf ("/* The following function returns code of functional unit\n"); 244 printf (" with given name (see define_cpu_unit). */\n"); 245 printf ("extern int get_cpu_unit_code (const char *);\n"); 246 printf ("/* The following function returns nonzero if functional\n"); 247 printf (" unit with given code is currently reserved in given\n"); 248 printf (" DFA state. */\n"); 249 printf ("extern int cpu_unit_reservation_p (state_t, int);\n"); 250 printf ("#endif\n\n"); 251 printf ("/* The following function returns true if insn\n"); 252 printf (" has a dfa reservation. */\n"); 253 printf ("extern bool insn_has_dfa_reservation_p (rtx);\n\n"); 254 printf ("/* Clean insn code cache. It should be called if there\n"); 255 printf (" is a chance that condition value in a\n"); 256 printf (" define_insn_reservation will be changed after\n"); 257 printf (" last call of dfa_start. */\n"); 258 printf ("extern void dfa_clean_insn_cache (void);\n\n"); 259 printf ("extern void dfa_clear_single_insn_cache (rtx);\n\n"); 260 printf ("/* Initiate and finish work with DFA. They should be\n"); 261 printf (" called as the first and the last interface\n"); 262 printf (" functions. */\n"); 263 printf ("extern void dfa_start (void);\n"); 264 printf ("extern void dfa_finish (void);\n"); 265 } 266 else 267 { 268 /* Otherwise we do no scheduling, but we need these typedefs 269 in order to avoid uglifying other code with more ifdefs. */ 270 printf ("typedef void *state_t;\n\n"); 271 } 272 273 /* Output flag masks for use by reorg. 274 275 Flags are used to hold branch direction and prediction information 276 for use by eligible_for_... */ 277 printf("\n#define ATTR_FLAG_forward\t0x1\n"); 278 printf("#define ATTR_FLAG_backward\t0x2\n"); 279 printf("#define ATTR_FLAG_likely\t0x4\n"); 280 printf("#define ATTR_FLAG_very_likely\t0x8\n"); 281 printf("#define ATTR_FLAG_unlikely\t0x10\n"); 282 printf("#define ATTR_FLAG_very_unlikely\t0x20\n"); 283 284 puts("\n#endif /* GCC_INSN_ATTR_H */"); 285 286 if (ferror (stdout) || fflush (stdout) || fclose (stdout)) 287 return FATAL_EXIT_CODE; 288 289 return SUCCESS_EXIT_CODE; 290 } 291