gcc/genattr.c

   1 /* Generate attribute information (insn-attr.h) from machine description.
   2    Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007
   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 ("\n#if AUTOMATON_ALTS\n");
 188       printf ("/* The following function returns number of alternative\n");
 189       printf ("   reservations of given insn.  It may be used for better\n");
 190       printf ("   insns scheduling heuristics. */\n");
 191       printf ("extern int insn_alts (rtx);\n\n");
 192       printf ("#endif\n\n");
 193       printf ("/* Maximal possible number of insns waiting results being\n");
 194       printf ("   produced by insns whose execution is not finished. */\n");
 195       printf ("extern const int max_insn_queue_index;\n\n");
 196       printf ("/* Pointer to data describing current state of DFA.  */\n");
 197       printf ("typedef void *state_t;\n\n");
 198       printf ("/* Size of the data in bytes.  */\n");
 199       printf ("extern int state_size (void);\n\n");
 200       printf ("/* Initiate given DFA state, i.e. Set up the state\n");
 201       printf ("   as all functional units were not reserved.  */\n");
 202       printf ("extern void state_reset (state_t);\n");
 203       printf ("/* The following function returns negative value if given\n");
 204       printf ("   insn can be issued in processor state described by given\n");
 205       printf ("   DFA state.  In this case, the DFA state is changed to\n");
 206       printf ("   reflect the current and future reservations by given\n");
 207       printf ("   insn.  Otherwise the function returns minimal time\n");
 208       printf ("   delay to issue the insn.  This delay may be zero\n");
 209       printf ("   for superscalar or VLIW processors.  If the second\n");
 210       printf ("   parameter is NULL the function changes given DFA state\n");
 211       printf ("   as new processor cycle started.  */\n");
 212       printf ("extern int state_transition (state_t, rtx);\n");
 213       printf ("\n#if AUTOMATON_STATE_ALTS\n");
 214       printf ("/* The following function returns number of possible\n");
 215       printf ("   alternative reservations of given insn in given\n");
 216       printf ("   DFA state.  It may be used for better insns scheduling\n");
 217       printf ("   heuristics.  By default the function is defined if\n");
 218       printf ("   macro AUTOMATON_STATE_ALTS is defined because its\n");
 219       printf ("   implementation may require much memory.  */\n");
 220       printf ("extern int state_alts (state_t, rtx);\n");
 221       printf ("#endif\n\n");
 222       printf ("extern int min_issue_delay (state_t, rtx);\n");
 223       printf ("/* The following function returns nonzero if no one insn\n");
 224       printf ("   can be issued in current DFA state. */\n");
 225       printf ("extern int state_dead_lock_p (state_t);\n");
 226       printf ("/* The function returns minimal delay of issue of the 2nd\n");
 227       printf ("   insn after issuing the 1st insn in given DFA state.\n");
 228       printf ("   The 1st insn should be issued in given state (i.e.\n");
 229       printf ("    state_transition should return negative value for\n");
 230       printf ("    the insn and the state).  Data dependencies between\n");
 231       printf ("    the insns are ignored by the function.  */\n");
 232       printf
 233         ("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
 234       printf ("/* The following function outputs reservations for given\n");
 235       printf ("   insn as they are described in the corresponding\n");
 236       printf ("   define_insn_reservation.  */\n");
 237       printf ("extern void print_reservation (FILE *, rtx);\n");
 238       printf ("\n#if CPU_UNITS_QUERY\n");
 239       printf ("/* The following function returns code of functional unit\n");
 240       printf ("   with given name (see define_cpu_unit). */\n");
 241       printf ("extern int get_cpu_unit_code (const char *);\n");
 242       printf ("/* The following function returns nonzero if functional\n");
 243       printf ("   unit with given code is currently reserved in given\n");
 244       printf ("   DFA state.  */\n");
 245       printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
 246       printf ("#endif\n\n");
 247       printf ("/* The following function returns true if insn\n");
 248       printf ("   has a dfa reservation.  */\n");
 249       printf ("extern bool insn_has_dfa_reservation_p (rtx);\n\n");
 250       printf ("/* Clean insn code cache.  It should be called if there\n");
 251       printf ("   is a chance that condition value in a\n");
 252       printf ("   define_insn_reservation will be changed after\n");
 253       printf ("   last call of dfa_start.  */\n");
 254       printf ("extern void dfa_clean_insn_cache (void);\n\n");
 255       printf ("extern void dfa_clear_single_insn_cache (rtx);\n\n");
 256       printf ("/* Initiate and finish work with DFA.  They should be\n");
 257       printf ("   called as the first and the last interface\n");
 258       printf ("   functions.  */\n");
 259       printf ("extern void dfa_start (void);\n");
 260       printf ("extern void dfa_finish (void);\n");
 261     }
 262   else
 263     {
 264       /* Otherwise we do no scheduling, but we need these typedefs
 265          in order to avoid uglifying other code with more ifdefs.  */
 266       printf ("typedef void *state_t;\n\n");
 267     }
 268
 269   /* Output flag masks for use by reorg.
 270
 271      Flags are used to hold branch direction and prediction information
 272      for use by eligible_for_...  */
 273   printf("\n#define ATTR_FLAG_forward\t0x1\n");
 274   printf("#define ATTR_FLAG_backward\t0x2\n");
 275   printf("#define ATTR_FLAG_likely\t0x4\n");
 276   printf("#define ATTR_FLAG_very_likely\t0x8\n");
 277   printf("#define ATTR_FLAG_unlikely\t0x10\n");
 278   printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
 279
 280   puts("\n#endif /* GCC_INSN_ATTR_H */");
 281
 282   if (ferror (stdout) || fflush (stdout) || fclose (stdout))
 283     return FATAL_EXIT_CODE;
 284
 285   return SUCCESS_EXIT_CODE;
 286 }