gcc/recog.h

   1 /* Declarations for interface to insn recognizer and insn-output.c.
   2    Copyright (C) 1987-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_RECOG_H
  21 #define GCC_RECOG_H
  22
  23 /* Random number that should be large enough for all purposes.  Also define
  24    a type that has at least MAX_RECOG_ALTERNATIVES + 1 bits, with the extra
  25    bit giving an invalid value that can be used to mean "uninitialized".  */
  26 #define MAX_RECOG_ALTERNATIVES 30
  27 typedef unsigned int alternative_mask;
  28
  29 /* A mask of all alternatives.  */
  30 #define ALL_ALTERNATIVES ((alternative_mask) -1)
  31
  32 /* A mask containing just alternative X.  */
  33 #define ALTERNATIVE_BIT(X) ((alternative_mask) 1 << (X))
  34
  35 /* Types of operands.  */
  36 enum op_type {
  37   OP_IN,
  38   OP_OUT,
  39   OP_INOUT
  40 };
  41
  42 struct operand_alternative
  43 {
  44   /* Pointer to the beginning of the constraint string for this alternative,
  45      for easier access by alternative number.  */
  46   const char *constraint;
  47
  48   /* The register class valid for this alternative (possibly NO_REGS).  */
  49   ENUM_BITFIELD (reg_class) cl : 16;
  50
  51   /* "Badness" of this alternative, computed from number of '?' and '!'
  52      characters in the constraint string.  */
  53   unsigned int reject : 16;
  54
  55   /* -1 if no matching constraint was found, or an operand number.  */
  56   int matches : 8;
  57   /* The same information, but reversed: -1 if this operand is not
  58      matched by any other, or the operand number of the operand that
  59      matches this one.  */
  60   int matched : 8;
  61
  62   /* Nonzero if '&' was found in the constraint string.  */
  63   unsigned int earlyclobber : 1;
  64   /* Nonzero if TARGET_MEM_CONSTRAINT was found in the constraint
  65      string.  */
  66   unsigned int memory_ok : 1;
  67   /* Nonzero if 'p' was found in the constraint string.  */
  68   unsigned int is_address : 1;
  69   /* Nonzero if 'X' was found in the constraint string, or if the constraint
  70      string for this alternative was empty.  */
  71   unsigned int anything_ok : 1;
  72
  73   unsigned int unused : 12;
  74 };
  75
  76 /* Return the class for operand I of alternative ALT, taking matching
  77    constraints into account.  */
  78
  79 static inline enum reg_class
  80 alternative_class (const operand_alternative *alt, int i)
  81 {
  82   return alt[i].matches >= 0 ? alt[alt[i].matches].cl : alt[i].cl;
  83 }
  84
  85 extern void init_recog (void);
  86 extern void init_recog_no_volatile (void);
  87 extern int check_asm_operands (rtx);
  88 extern int asm_operand_ok (rtx, const char *, const char **);
  89 extern bool validate_change (rtx, rtx *, rtx, bool);
  90 extern bool validate_unshare_change (rtx, rtx *, rtx, bool);
  91 extern bool canonicalize_change_group (rtx insn, rtx x);
  92 extern int insn_invalid_p (rtx_insn *, bool);
  93 extern int verify_changes (int);
  94 extern void confirm_change_group (void);
  95 extern int apply_change_group (void);
  96 extern int num_validated_changes (void);
  97 extern void cancel_changes (int);
  98 extern int constrain_operands (int, alternative_mask);
  99 extern int constrain_operands_cached (rtx_insn *, int);
 100 extern int memory_address_addr_space_p (enum machine_mode, rtx, addr_space_t);
 101 #define memory_address_p(mode,addr) \
 102         memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
 103 extern int strict_memory_address_addr_space_p (enum machine_mode, rtx,
 104                                                addr_space_t);
 105 #define strict_memory_address_p(mode,addr) \
 106         strict_memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
 107 extern int validate_replace_rtx_subexp (rtx, rtx, rtx, rtx *);
 108 extern int validate_replace_rtx (rtx, rtx, rtx);
 109 extern int validate_replace_rtx_part (rtx, rtx, rtx *, rtx);
 110 extern int validate_replace_rtx_part_nosimplify (rtx, rtx, rtx *, rtx);
 111 extern void validate_replace_rtx_group (rtx, rtx, rtx);
 112 extern void validate_replace_src_group (rtx, rtx, rtx);
 113 extern bool validate_simplify_insn (rtx insn);
 114 extern int num_changes_pending (void);
 115 #ifdef HAVE_cc0
 116 extern int next_insn_tests_no_inequality (rtx);
 117 #endif
 118 extern bool reg_fits_class_p (const_rtx, reg_class_t, int, enum machine_mode);
 119
 120 extern int offsettable_memref_p (rtx);
 121 extern int offsettable_nonstrict_memref_p (rtx);
 122 extern int offsettable_address_addr_space_p (int, enum machine_mode, rtx,
 123                                              addr_space_t);
 124 #define offsettable_address_p(strict,mode,addr) \
 125         offsettable_address_addr_space_p ((strict), (mode), (addr), \
 126                                           ADDR_SPACE_GENERIC)
 127 extern bool mode_dependent_address_p (rtx, addr_space_t);
 128
 129 extern int recog (rtx, rtx, int *);
 130 #ifndef GENERATOR_FILE
 131 static inline int recog_memoized (rtx_insn *insn);
 132 #endif
 133 extern void add_clobbers (rtx, int);
 134 extern int added_clobbers_hard_reg_p (int);
 135 extern void insn_extract (rtx_insn *);
 136 extern void extract_insn (rtx_insn *);
 137 extern void extract_constrain_insn (rtx_insn *insn);
 138 extern void extract_constrain_insn_cached (rtx_insn *);
 139 extern void extract_insn_cached (rtx_insn *);
 140 extern void preprocess_constraints (int, int, const char **,
 141                                     operand_alternative *);
 142 extern const operand_alternative *preprocess_insn_constraints (int);
 143 extern void preprocess_constraints (rtx);
 144 extern rtx peep2_next_insn (int);
 145 extern int peep2_regno_dead_p (int, int);
 146 extern int peep2_reg_dead_p (int, rtx);
 147 #ifdef CLEAR_HARD_REG_SET
 148 extern rtx peep2_find_free_register (int, int, const char *,
 149                                      enum machine_mode, HARD_REG_SET *);
 150 #endif
 151 extern rtx peephole2_insns (rtx, rtx, int *);
 152
 153 extern int store_data_bypass_p (rtx_insn *, rtx_insn *);
 154 extern int if_test_bypass_p (rtx_insn *, rtx_insn *);
 155
 156 #ifndef GENERATOR_FILE
 157 /* Try recognizing the instruction INSN,
 158    and return the code number that results.
 159    Remember the code so that repeated calls do not
 160    need to spend the time for actual rerecognition.
 161
 162    This function is the normal interface to instruction recognition.
 163    The automatically-generated function `recog' is normally called
 164    through this one.  */
 165
 166 static inline int
 167 recog_memoized (rtx_insn *insn)
 168 {
 169   if (INSN_CODE (insn) < 0)
 170     INSN_CODE (insn) = recog (PATTERN (insn), insn, 0);
 171   return INSN_CODE (insn);
 172 }
 173 #endif
 174
 175 /* Skip chars until the next ',' or the end of the string.  This is
 176    useful to skip alternatives in a constraint string.  */
 177 static inline const char *
 178 skip_alternative (const char *p)
 179 {
 180   const char *r = p;
 181   while (*r != '\0' && *r != ',')
 182     r++;
 183   if (*r == ',')
 184     r++;
 185   return r;
 186 }
 187
 188 /* Nonzero means volatile operands are recognized.  */
 189 extern int volatile_ok;
 190
 191 /* Set by constrain_operands to the number of the alternative that
 192    matched.  */
 193 extern int which_alternative;
 194
 195 /* The following vectors hold the results from insn_extract.  */
 196
 197 struct recog_data_d
 198 {
 199   /* It is very tempting to make the 5 operand related arrays into a
 200      structure and index on that.  However, to be source compatible
 201      with all of the existing md file insn constraints and output
 202      templates, we need `operand' as a flat array.  Without that
 203      member, making an array for the rest seems pointless.  */
 204
 205   /* Gives value of operand N.  */
 206   rtx operand[MAX_RECOG_OPERANDS];
 207
 208   /* Gives location where operand N was found.  */
 209   rtx *operand_loc[MAX_RECOG_OPERANDS];
 210
 211   /* Gives the constraint string for operand N.  */
 212   const char *constraints[MAX_RECOG_OPERANDS];
 213
 214   /* Nonzero if operand N is a match_operator or a match_parallel.  */
 215   char is_operator[MAX_RECOG_OPERANDS];
 216
 217   /* Gives the mode of operand N.  */
 218   enum machine_mode operand_mode[MAX_RECOG_OPERANDS];
 219
 220   /* Gives the type (in, out, inout) for operand N.  */
 221   enum op_type operand_type[MAX_RECOG_OPERANDS];
 222
 223   /* Gives location where the Nth duplicate-appearance of an operand
 224      was found.  This is something that matched MATCH_DUP.  */
 225   rtx *dup_loc[MAX_DUP_OPERANDS];
 226
 227   /* Gives the operand number that was duplicated in the Nth
 228      duplicate-appearance of an operand.  */
 229   char dup_num[MAX_DUP_OPERANDS];
 230
 231   /* ??? Note that these are `char' instead of `unsigned char' to (try to)
 232      avoid certain lossage from K&R C, wherein `unsigned char' default
 233      promotes to `unsigned int' instead of `int' as in ISO C.  As of 1999,
 234      the most common places to bootstrap from K&R C are SunOS and HPUX,
 235      both of which have signed characters by default.  The only other
 236      supported natives that have both K&R C and unsigned characters are
 237      ROMP and Irix 3, and neither have been seen for a while, but do
 238      continue to consider unsignedness when performing arithmetic inside
 239      a comparison.  */
 240
 241   /* The number of operands of the insn.  */
 242   char n_operands;
 243
 244   /* The number of MATCH_DUPs in the insn.  */
 245   char n_dups;
 246
 247   /* The number of alternatives in the constraints for the insn.  */
 248   char n_alternatives;
 249
 250   /* True if insn is ASM_OPERANDS.  */
 251   bool is_asm;
 252
 253   /* In case we are caching, hold insn data was generated for.  */
 254   rtx insn;
 255 };
 256
 257 extern struct recog_data_d recog_data;
 258
 259 extern const operand_alternative *recog_op_alt;
 260
 261 /* Return a pointer to an array in which index OP describes the constraints
 262    on operand OP of the current instruction alternative (which_alternative).
 263    Only valid after calling preprocess_constraints and constrain_operands.  */
 264
 265 inline static const operand_alternative *
 266 which_op_alt ()
 267 {
 268   gcc_checking_assert (IN_RANGE (which_alternative, 0,
 269                                  recog_data.n_alternatives - 1));
 270   return &recog_op_alt[which_alternative * recog_data.n_operands];
 271 }
 272
 273 /* A table defined in insn-output.c that give information about
 274    each insn-code value.  */
 275
 276 typedef int (*insn_operand_predicate_fn) (rtx, enum machine_mode);
 277 typedef const char * (*insn_output_fn) (rtx *, rtx_insn *);
 278
 279 struct insn_gen_fn
 280 {
 281   typedef rtx (*f0) (void);
 282   typedef rtx (*f1) (rtx);
 283   typedef rtx (*f2) (rtx, rtx);
 284   typedef rtx (*f3) (rtx, rtx, rtx);
 285   typedef rtx (*f4) (rtx, rtx, rtx, rtx);
 286   typedef rtx (*f5) (rtx, rtx, rtx, rtx, rtx);
 287   typedef rtx (*f6) (rtx, rtx, rtx, rtx, rtx, rtx);
 288   typedef rtx (*f7) (rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 289   typedef rtx (*f8) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 290   typedef rtx (*f9) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 291   typedef rtx (*f10) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 292   typedef rtx (*f11) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 293   typedef rtx (*f12) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 294   typedef rtx (*f13) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 295   typedef rtx (*f14) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 296   typedef rtx (*f15) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 297   typedef rtx (*f16) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 298
 299   typedef f0 stored_funcptr;
 300
 301   rtx operator () (void) const { return ((f0)func) (); }
 302   rtx operator () (rtx a0) const { return ((f1)func) (a0); }
 303   rtx operator () (rtx a0, rtx a1) const { return ((f2)func) (a0, a1); }
 304   rtx operator () (rtx a0, rtx a1, rtx a2) const { return ((f3)func) (a0, a1, a2); }
 305   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3) const { return ((f4)func) (a0, a1, a2, a3); }
 306   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4) const { return ((f5)func) (a0, a1, a2, a3, a4); }
 307   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5) const { return ((f6)func) (a0, a1, a2, a3, a4, a5); }
 308   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6) const { return ((f7)func) (a0, a1, a2, a3, a4, a5, a6); }
 309   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7) const { return ((f8)func) (a0, a1, a2, a3, a4, a5, a6, a7); }
 310   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8) const { return ((f9)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8); }
 311   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8, rtx a9) const { return ((f10)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9); }
 312   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8, rtx a9, rtx a10) const { return ((f11)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10); }
 313   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8, rtx a9, rtx a10, rtx a11) const { return ((f12)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11); }
 314   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8, rtx a9, rtx a10, rtx a11, rtx a12) const { return ((f13)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12); }
 315   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8, rtx a9, rtx a10, rtx a11, rtx a12, rtx a13) const { return ((f14)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13); }
 316   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8, rtx a9, rtx a10, rtx a11, rtx a12, rtx a13, rtx a14) const { return ((f15)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14); }
 317   rtx operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5, rtx a6, rtx a7, rtx a8, rtx a9, rtx a10, rtx a11, rtx a12, rtx a13, rtx a14, rtx a15) const { return ((f16)func) (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15); }
 318
 319   // This is for compatibility of code that invokes functions like
 320   //   (*funcptr) (arg)
 321   insn_gen_fn operator * (void) const { return *this; }
 322
 323   // The wrapped function pointer must be public and there must not be any
 324   // constructors.  Otherwise the insn_data_d struct initializers generated
 325   // by genoutput.c will result in static initializer functions, which defeats
 326   // the purpose of the generated insn_data_d array.
 327   stored_funcptr func;
 328 };
 329
 330 struct insn_operand_data
 331 {
 332   const insn_operand_predicate_fn predicate;
 333
 334   const char *const constraint;
 335
 336   ENUM_BITFIELD(machine_mode) const mode : 16;
 337
 338   const char strict_low;
 339
 340   const char is_operator;
 341
 342   const char eliminable;
 343
 344   const char allows_mem;
 345 };
 346
 347 /* Legal values for insn_data.output_format.  Indicate what type of data
 348    is stored in insn_data.output.  */
 349 #define INSN_OUTPUT_FORMAT_NONE         0       /* abort */
 350 #define INSN_OUTPUT_FORMAT_SINGLE       1       /* const char * */
 351 #define INSN_OUTPUT_FORMAT_MULTI        2       /* const char * const * */
 352 #define INSN_OUTPUT_FORMAT_FUNCTION     3       /* const char * (*)(...) */
 353
 354 struct insn_data_d
 355 {
 356   const char *const name;
 357 #if HAVE_DESIGNATED_UNION_INITIALIZERS
 358   union {
 359     const char *single;
 360     const char *const *multi;
 361     insn_output_fn function;
 362   } output;
 363 #else
 364   struct {
 365     const char *single;
 366     const char *const *multi;
 367     insn_output_fn function;
 368   } output;
 369 #endif
 370   const insn_gen_fn genfun;
 371   const struct insn_operand_data *const operand;
 372
 373   const char n_generator_args;
 374   const char n_operands;
 375   const char n_dups;
 376   const char n_alternatives;
 377   const char output_format;
 378 };
 379
 380 extern const struct insn_data_d insn_data[];
 381 extern int peep2_current_count;
 382
 383 #ifndef GENERATOR_FILE
 384 #include "insn-codes.h"
 385
 386 /* An enum of boolean attributes that may only depend on the current
 387    subtarget, not on things like operands or compiler phase.  */
 388 enum bool_attr {
 389   BA_ENABLED,
 390   BA_PREFERRED_FOR_SPEED,
 391   BA_PREFERRED_FOR_SIZE,
 392   BA_LAST = BA_PREFERRED_FOR_SIZE
 393 };
 394
 395 /* Target-dependent globals.  */
 396 struct target_recog {
 397   bool x_initialized;
 398   alternative_mask x_bool_attr_masks[LAST_INSN_CODE][BA_LAST + 1];
 399   operand_alternative *x_op_alt[LAST_INSN_CODE];
 400 };
 401
 402 extern struct target_recog default_target_recog;
 403 #if SWITCHABLE_TARGET
 404 extern struct target_recog *this_target_recog;
 405 #else
 406 #define this_target_recog (&default_target_recog)
 407 #endif
 408
 409 alternative_mask get_enabled_alternatives (rtx_insn *);
 410 alternative_mask get_preferred_alternatives (rtx_insn *);
 411 alternative_mask get_preferred_alternatives (rtx_insn *, basic_block);
 412 bool check_bool_attrs (rtx_insn *);
 413
 414 void recog_init ();
 415 #endif
 416
 417 #endif /* GCC_RECOG_H */