gcc/recog.h

   1 /* Declarations for interface to insn recognizer and insn-output.c.
   2    Copyright (C) 1987, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004,
   3    2005, 2006, 2007 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* Random number that should be large enough for all purposes.  */
  22 #define MAX_RECOG_ALTERNATIVES 30
  23
  24 /* Types of operands.  */
  25 enum op_type {
  26   OP_IN,
  27   OP_OUT,
  28   OP_INOUT
  29 };
  30
  31 struct operand_alternative
  32 {
  33   /* Pointer to the beginning of the constraint string for this alternative,
  34      for easier access by alternative number.  */
  35   const char *constraint;
  36
  37   /* The register class valid for this alternative (possibly NO_REGS).  */
  38   enum reg_class cl;
  39
  40   /* "Badness" of this alternative, computed from number of '?' and '!'
  41      characters in the constraint string.  */
  42   unsigned int reject;
  43
  44   /* -1 if no matching constraint was found, or an operand number.  */
  45   int matches;
  46   /* The same information, but reversed: -1 if this operand is not
  47      matched by any other, or the operand number of the operand that
  48      matches this one.  */
  49   int matched;
  50
  51   /* Nonzero if '&' was found in the constraint string.  */
  52   unsigned int earlyclobber:1;
  53   /* Nonzero if TARGET_MEM_CONSTRAINT was found in the constraint
  54      string.  */
  55   unsigned int memory_ok:1;
  56   /* Nonzero if 'o' was found in the constraint string.  */
  57   unsigned int offmem_ok:1;
  58   /* Nonzero if 'V' was found in the constraint string.  */
  59   unsigned int nonoffmem_ok:1;
  60   /* Nonzero if '<' was found in the constraint string.  */
  61   unsigned int decmem_ok:1;
  62   /* Nonzero if '>' was found in the constraint string.  */
  63   unsigned int incmem_ok:1;
  64   /* Nonzero if 'p' was found in the constraint string.  */
  65   unsigned int is_address:1;
  66   /* Nonzero if 'X' was found in the constraint string, or if the constraint
  67      string for this alternative was empty.  */
  68   unsigned int anything_ok:1;
  69 };
  70
  71
  72 extern void init_recog (void);
  73 extern void init_recog_no_volatile (void);
  74 extern int check_asm_operands (rtx);
  75 extern int asm_operand_ok (rtx, const char *);
  76 extern bool validate_change (rtx, rtx *, rtx, bool);
  77 extern bool validate_unshare_change (rtx, rtx *, rtx, bool);
  78 extern bool canonicalize_change_group (rtx insn, rtx x);
  79 extern int insn_invalid_p (rtx);
  80 extern int verify_changes (int);
  81 extern void confirm_change_group (void);
  82 extern int apply_change_group (void);
  83 extern int num_validated_changes (void);
  84 extern void cancel_changes (int);
  85 extern int constrain_operands (int);
  86 extern int constrain_operands_cached (int);
  87 extern int memory_address_p (enum machine_mode, rtx);
  88 extern int strict_memory_address_p (enum machine_mode, rtx);
  89 extern int validate_replace_rtx (rtx, rtx, rtx);
  90 extern void validate_replace_rtx_group (rtx, rtx, rtx);
  91 extern void validate_replace_src_group (rtx, rtx, rtx);
  92 extern bool validate_simplify_insn (rtx insn);
  93 extern int num_changes_pending (void);
  94 #ifdef HAVE_cc0
  95 extern int next_insn_tests_no_inequality (rtx);
  96 #endif
  97 extern int reg_fits_class_p (rtx, enum reg_class, int, enum machine_mode);
  98
  99 extern int offsettable_memref_p (rtx);
 100 extern int offsettable_nonstrict_memref_p (rtx);
 101 extern int offsettable_address_p (int, enum machine_mode, rtx);
 102 extern int mode_dependent_address_p (rtx);
 103
 104 extern int recog (rtx, rtx, int *);
 105 #ifndef GENERATOR_FILE
 106 static inline int recog_memoized (rtx insn);
 107 #endif
 108 extern void add_clobbers (rtx, int);
 109 extern int added_clobbers_hard_reg_p (int);
 110 extern void insn_extract (rtx);
 111 extern void extract_insn (rtx);
 112 extern void extract_constrain_insn_cached (rtx);
 113 extern void extract_insn_cached (rtx);
 114 extern void preprocess_constraints (void);
 115 extern rtx peep2_next_insn (int);
 116 extern int peep2_regno_dead_p (int, int);
 117 extern int peep2_reg_dead_p (int, rtx);
 118 #ifdef CLEAR_HARD_REG_SET
 119 extern rtx peep2_find_free_register (int, int, const char *,
 120                                      enum machine_mode, HARD_REG_SET *);
 121 #endif
 122 extern rtx peephole2_insns (rtx, rtx, int *);
 123
 124 extern int store_data_bypass_p (rtx, rtx);
 125 extern int if_test_bypass_p (rtx, rtx);
 126
 127 #ifndef GENERATOR_FILE
 128 /* Try recognizing the instruction INSN,
 129    and return the code number that results.
 130    Remember the code so that repeated calls do not
 131    need to spend the time for actual rerecognition.
 132
 133    This function is the normal interface to instruction recognition.
 134    The automatically-generated function `recog' is normally called
 135    through this one.  */
 136
 137 static inline int
 138 recog_memoized (rtx insn)
 139 {
 140   if (INSN_CODE (insn) < 0)
 141     INSN_CODE (insn) = recog (PATTERN (insn), insn, 0);
 142   return INSN_CODE (insn);
 143 }
 144 #endif
 145
 146 /* Skip chars until the next ',' or the end of the string.  This is
 147    useful to skip alternatives in a constraint string.  */
 148 static inline const char *
 149 skip_alternative (const char *p)
 150 {
 151   const char *r = p;
 152   while (*r != '\0' && *r != ',')
 153     r++;
 154   if (*r == ',')
 155     r++;
 156   return r;
 157 }
 158
 159 /* Nonzero means volatile operands are recognized.  */
 160 extern int volatile_ok;
 161
 162 /* Set by constrain_operands to the number of the alternative that
 163    matched.  */
 164 extern int which_alternative;
 165
 166 /* The following vectors hold the results from insn_extract.  */
 167
 168 struct recog_data
 169 {
 170   /* It is very tempting to make the 5 operand related arrays into a
 171      structure and index on that.  However, to be source compatible
 172      with all of the existing md file insn constraints and output
 173      templates, we need `operand' as a flat array.  Without that
 174      member, making an array for the rest seems pointless.  */
 175
 176   /* Gives value of operand N.  */
 177   rtx operand[MAX_RECOG_OPERANDS];
 178
 179   /* Gives location where operand N was found.  */
 180   rtx *operand_loc[MAX_RECOG_OPERANDS];
 181
 182   /* Gives the constraint string for operand N.  */
 183   const char *constraints[MAX_RECOG_OPERANDS];
 184
 185   /* Gives the mode of operand N.  */
 186   enum machine_mode operand_mode[MAX_RECOG_OPERANDS];
 187
 188   /* Gives the type (in, out, inout) for operand N.  */
 189   enum op_type operand_type[MAX_RECOG_OPERANDS];
 190
 191   /* Gives location where the Nth duplicate-appearance of an operand
 192      was found.  This is something that matched MATCH_DUP.  */
 193   rtx *dup_loc[MAX_DUP_OPERANDS];
 194
 195   /* Gives the operand number that was duplicated in the Nth
 196      duplicate-appearance of an operand.  */
 197   char dup_num[MAX_DUP_OPERANDS];
 198
 199   /* ??? Note that these are `char' instead of `unsigned char' to (try to)
 200      avoid certain lossage from K&R C, wherein `unsigned char' default
 201      promotes to `unsigned int' instead of `int' as in ISO C.  As of 1999,
 202      the most common places to bootstrap from K&R C are SunOS and HPUX,
 203      both of which have signed characters by default.  The only other
 204      supported natives that have both K&R C and unsigned characters are
 205      ROMP and Irix 3, and neither have been seen for a while, but do
 206      continue to consider unsignedness when performing arithmetic inside
 207      a comparison.  */
 208
 209   /* The number of operands of the insn.  */
 210   char n_operands;
 211
 212   /* The number of MATCH_DUPs in the insn.  */
 213   char n_dups;
 214
 215   /* The number of alternatives in the constraints for the insn.  */
 216   char n_alternatives;
 217
 218   /* Specifies whether an insn alternative is enabled using the
 219      `enabled' attribute in the insn pattern definition.  For back
 220      ends not using the `enabled' attribute the array fields are
 221      always set to `true' in expand_insn.  */
 222   bool alternative_enabled_p [MAX_RECOG_ALTERNATIVES];
 223
 224   /* In case we are caching, hold insn data was generated for.  */
 225   rtx insn;
 226 };
 227
 228 extern struct recog_data recog_data;
 229
 230 /* Contains a vector of operand_alternative structures for every operand.
 231    Set up by preprocess_constraints.  */
 232 extern struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES];
 233
 234 /* A table defined in insn-output.c that give information about
 235    each insn-code value.  */
 236
 237 typedef int (*insn_operand_predicate_fn) (rtx, enum machine_mode);
 238 typedef const char * (*insn_output_fn) (rtx *, rtx);
 239 typedef rtx (*insn_gen_fn) (rtx, ...);
 240
 241 struct insn_operand_data
 242 {
 243   const insn_operand_predicate_fn predicate;
 244
 245   const char *const constraint;
 246
 247   ENUM_BITFIELD(machine_mode) const mode : 16;
 248
 249   const char strict_low;
 250
 251   const char eliminable;
 252 };
 253
 254 /* Legal values for insn_data.output_format.  Indicate what type of data
 255    is stored in insn_data.output.  */
 256 #define INSN_OUTPUT_FORMAT_NONE         0       /* abort */
 257 #define INSN_OUTPUT_FORMAT_SINGLE       1       /* const char * */
 258 #define INSN_OUTPUT_FORMAT_MULTI        2       /* const char * const * */
 259 #define INSN_OUTPUT_FORMAT_FUNCTION     3       /* const char * (*)(...) */
 260
 261 struct insn_data
 262 {
 263   const char *const name;
 264 #if HAVE_DESIGNATED_INITIALIZERS
 265   union {
 266     const char *single;
 267     const char *const *multi;
 268     insn_output_fn function;
 269   } output;
 270 #else
 271   struct {
 272     const char *single;
 273     const char *const *multi;
 274     insn_output_fn function;
 275   } output;
 276 #endif
 277   const insn_gen_fn genfun;
 278   const struct insn_operand_data *const operand;
 279
 280   const char n_operands;
 281   const char n_dups;
 282   const char n_alternatives;
 283   const char output_format;
 284 };
 285
 286 extern const struct insn_data insn_data[];
 287 extern int peep2_current_count;