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, 2008, 2009, 2010 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 *, 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_addr_space_p (enum machine_mode, rtx, addr_space_t);
  88 #define memory_address_p(mode,addr) \
  89         memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
  90 extern int strict_memory_address_addr_space_p (enum machine_mode, rtx,
  91                                                addr_space_t);
  92 #define strict_memory_address_p(mode,addr) \
  93         strict_memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
  94 extern int validate_replace_rtx_subexp (rtx, rtx, rtx, rtx *);
  95 extern int validate_replace_rtx (rtx, rtx, rtx);
  96 extern int validate_replace_rtx_part (rtx, rtx, rtx *, rtx);
  97 extern int validate_replace_rtx_part_nosimplify (rtx, rtx, rtx *, rtx);
  98 extern void validate_replace_rtx_group (rtx, rtx, rtx);
  99 extern void validate_replace_src_group (rtx, rtx, rtx);
 100 extern bool validate_simplify_insn (rtx insn);
 101 extern int num_changes_pending (void);
 102 #ifdef HAVE_cc0
 103 extern int next_insn_tests_no_inequality (rtx);
 104 #endif
 105 extern int reg_fits_class_p (rtx, enum reg_class, int, enum machine_mode);
 106
 107 extern int offsettable_memref_p (rtx);
 108 extern int offsettable_nonstrict_memref_p (rtx);
 109 extern int offsettable_address_addr_space_p (int, enum machine_mode, rtx,
 110                                              addr_space_t);
 111 #define offsettable_address_p(strict,mode,addr) \
 112         offsettable_address_addr_space_p ((strict), (mode), (addr), \
 113                                           ADDR_SPACE_GENERIC)
 114 extern bool mode_dependent_address_p (rtx);
 115
 116 extern int recog (rtx, rtx, int *);
 117 #ifndef GENERATOR_FILE
 118 static inline int recog_memoized (rtx insn);
 119 #endif
 120 extern void add_clobbers (rtx, int);
 121 extern int added_clobbers_hard_reg_p (int);
 122 extern void insn_extract (rtx);
 123 extern void extract_insn (rtx);
 124 extern void extract_constrain_insn_cached (rtx);
 125 extern void extract_insn_cached (rtx);
 126 extern void preprocess_constraints (void);
 127 extern rtx peep2_next_insn (int);
 128 extern int peep2_regno_dead_p (int, int);
 129 extern int peep2_reg_dead_p (int, rtx);
 130 #ifdef CLEAR_HARD_REG_SET
 131 extern rtx peep2_find_free_register (int, int, const char *,
 132                                      enum machine_mode, HARD_REG_SET *);
 133 #endif
 134 extern rtx peephole2_insns (rtx, rtx, int *);
 135
 136 extern int store_data_bypass_p (rtx, rtx);
 137 extern int if_test_bypass_p (rtx, rtx);
 138
 139 #ifndef GENERATOR_FILE
 140 /* Try recognizing the instruction INSN,
 141    and return the code number that results.
 142    Remember the code so that repeated calls do not
 143    need to spend the time for actual rerecognition.
 144
 145    This function is the normal interface to instruction recognition.
 146    The automatically-generated function `recog' is normally called
 147    through this one.  */
 148
 149 static inline int
 150 recog_memoized (rtx insn)
 151 {
 152   if (INSN_CODE (insn) < 0)
 153     INSN_CODE (insn) = recog (PATTERN (insn), insn, 0);
 154   return INSN_CODE (insn);
 155 }
 156 #endif
 157
 158 /* Skip chars until the next ',' or the end of the string.  This is
 159    useful to skip alternatives in a constraint string.  */
 160 static inline const char *
 161 skip_alternative (const char *p)
 162 {
 163   const char *r = p;
 164   while (*r != '\0' && *r != ',')
 165     r++;
 166   if (*r == ',')
 167     r++;
 168   return r;
 169 }
 170
 171 /* Nonzero means volatile operands are recognized.  */
 172 extern int volatile_ok;
 173
 174 /* Set by constrain_operands to the number of the alternative that
 175    matched.  */
 176 extern int which_alternative;
 177
 178 /* The following vectors hold the results from insn_extract.  */
 179
 180 struct recog_data
 181 {
 182   /* It is very tempting to make the 5 operand related arrays into a
 183      structure and index on that.  However, to be source compatible
 184      with all of the existing md file insn constraints and output
 185      templates, we need `operand' as a flat array.  Without that
 186      member, making an array for the rest seems pointless.  */
 187
 188   /* Gives value of operand N.  */
 189   rtx operand[MAX_RECOG_OPERANDS];
 190
 191   /* Gives location where operand N was found.  */
 192   rtx *operand_loc[MAX_RECOG_OPERANDS];
 193
 194   /* Gives the constraint string for operand N.  */
 195   const char *constraints[MAX_RECOG_OPERANDS];
 196
 197   /* Nonzero if operand N is a match_operator or a match_parallel.  */
 198   char is_operator[MAX_RECOG_OPERANDS];
 199
 200   /* Gives the mode of operand N.  */
 201   enum machine_mode operand_mode[MAX_RECOG_OPERANDS];
 202
 203   /* Gives the type (in, out, inout) for operand N.  */
 204   enum op_type operand_type[MAX_RECOG_OPERANDS];
 205
 206   /* Gives location where the Nth duplicate-appearance of an operand
 207      was found.  This is something that matched MATCH_DUP.  */
 208   rtx *dup_loc[MAX_DUP_OPERANDS];
 209
 210   /* Gives the operand number that was duplicated in the Nth
 211      duplicate-appearance of an operand.  */
 212   char dup_num[MAX_DUP_OPERANDS];
 213
 214   /* ??? Note that these are `char' instead of `unsigned char' to (try to)
 215      avoid certain lossage from K&R C, wherein `unsigned char' default
 216      promotes to `unsigned int' instead of `int' as in ISO C.  As of 1999,
 217      the most common places to bootstrap from K&R C are SunOS and HPUX,
 218      both of which have signed characters by default.  The only other
 219      supported natives that have both K&R C and unsigned characters are
 220      ROMP and Irix 3, and neither have been seen for a while, but do
 221      continue to consider unsignedness when performing arithmetic inside
 222      a comparison.  */
 223
 224   /* The number of operands of the insn.  */
 225   char n_operands;
 226
 227   /* The number of MATCH_DUPs in the insn.  */
 228   char n_dups;
 229
 230   /* The number of alternatives in the constraints for the insn.  */
 231   char n_alternatives;
 232
 233   /* Specifies whether an insn alternative is enabled using the
 234      `enabled' attribute in the insn pattern definition.  For back
 235      ends not using the `enabled' attribute the array fields are
 236      always set to `true' in expand_insn.  */
 237   bool alternative_enabled_p [MAX_RECOG_ALTERNATIVES];
 238
 239   /* In case we are caching, hold insn data was generated for.  */
 240   rtx insn;
 241 };
 242
 243 extern struct recog_data recog_data;
 244
 245 /* Contains a vector of operand_alternative structures for every operand.
 246    Set up by preprocess_constraints.  */
 247 extern struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES];
 248
 249 /* A table defined in insn-output.c that give information about
 250    each insn-code value.  */
 251
 252 typedef int (*insn_operand_predicate_fn) (rtx, enum machine_mode);
 253 typedef const char * (*insn_output_fn) (rtx *, rtx);
 254 typedef rtx (*insn_gen_fn) (rtx, ...);
 255
 256 struct insn_operand_data
 257 {
 258   const insn_operand_predicate_fn predicate;
 259
 260   const char *const constraint;
 261
 262   ENUM_BITFIELD(machine_mode) const mode : 16;
 263
 264   const char strict_low;
 265
 266   const char is_operator;
 267
 268   const char eliminable;
 269 };
 270
 271 /* Legal values for insn_data.output_format.  Indicate what type of data
 272    is stored in insn_data.output.  */
 273 #define INSN_OUTPUT_FORMAT_NONE         0       /* abort */
 274 #define INSN_OUTPUT_FORMAT_SINGLE       1       /* const char * */
 275 #define INSN_OUTPUT_FORMAT_MULTI        2       /* const char * const * */
 276 #define INSN_OUTPUT_FORMAT_FUNCTION     3       /* const char * (*)(...) */
 277
 278 struct insn_data
 279 {
 280   const char *const name;
 281 #if HAVE_DESIGNATED_INITIALIZERS
 282   union {
 283     const char *single;
 284     const char *const *multi;
 285     insn_output_fn function;
 286   } output;
 287 #else
 288   struct {
 289     const char *single;
 290     const char *const *multi;
 291     insn_output_fn function;
 292   } output;
 293 #endif
 294   const insn_gen_fn genfun;
 295   const struct insn_operand_data *const operand;
 296
 297   const char n_operands;
 298   const char n_dups;
 299   const char n_alternatives;
 300   const char output_format;
 301 };
 302
 303 extern const struct insn_data insn_data[];
 304 extern int peep2_current_count;