gcc/recog.h

   1 /* Declarations for interface to insn recognizer and insn-output.c.
   2    Copyright (C) 1987-2018 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 35
  27 typedef uint64_t 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 *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 (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 (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_insn *, rtx *);
 108 extern int validate_replace_rtx (rtx, rtx, rtx_insn *);
 109 extern int validate_replace_rtx_part (rtx, rtx, rtx *, rtx_insn *);
 110 extern int validate_replace_rtx_part_nosimplify (rtx, rtx, rtx *, rtx_insn *);
 111 extern void validate_replace_rtx_group (rtx, rtx, rtx_insn *);
 112 extern void validate_replace_src_group (rtx, rtx, rtx_insn *);
 113 extern bool validate_simplify_insn (rtx_insn *insn);
 114 extern int num_changes_pending (void);
 115 extern int next_insn_tests_no_inequality (rtx_insn *);
 116 extern bool reg_fits_class_p (const_rtx, reg_class_t, int, machine_mode);
 117
 118 extern int offsettable_memref_p (rtx);
 119 extern int offsettable_nonstrict_memref_p (rtx);
 120 extern int offsettable_address_addr_space_p (int, machine_mode, rtx,
 121                                              addr_space_t);
 122 #define offsettable_address_p(strict,mode,addr) \
 123         offsettable_address_addr_space_p ((strict), (mode), (addr), \
 124                                           ADDR_SPACE_GENERIC)
 125 extern bool mode_dependent_address_p (rtx, addr_space_t);
 126
 127 extern int recog (rtx, rtx_insn *, int *);
 128 #ifndef GENERATOR_FILE
 129 static inline int recog_memoized (rtx_insn *insn);
 130 #endif
 131 extern void add_clobbers (rtx, int);
 132 extern int added_clobbers_hard_reg_p (int);
 133 extern void insn_extract (rtx_insn *);
 134 extern void extract_insn (rtx_insn *);
 135 extern void extract_constrain_insn (rtx_insn *insn);
 136 extern void extract_constrain_insn_cached (rtx_insn *);
 137 extern void extract_insn_cached (rtx_insn *);
 138 extern void preprocess_constraints (int, int, const char **,
 139                                     operand_alternative *, rtx **);
 140 extern const operand_alternative *preprocess_insn_constraints (unsigned int);
 141 extern void preprocess_constraints (rtx_insn *);
 142 extern rtx_insn *peep2_next_insn (int);
 143 extern int peep2_regno_dead_p (int, int);
 144 extern int peep2_reg_dead_p (int, rtx);
 145 #ifdef CLEAR_HARD_REG_SET
 146 extern rtx peep2_find_free_register (int, int, const char *,
 147                                      machine_mode, HARD_REG_SET *);
 148 #endif
 149 extern rtx_insn *peephole2_insns (rtx, rtx_insn *, int *);
 150
 151 extern int store_data_bypass_p (rtx_insn *, rtx_insn *);
 152 extern int if_test_bypass_p (rtx_insn *, rtx_insn *);
 153
 154 #ifndef GENERATOR_FILE
 155 /* Try recognizing the instruction INSN,
 156    and return the code number that results.
 157    Remember the code so that repeated calls do not
 158    need to spend the time for actual rerecognition.
 159
 160    This function is the normal interface to instruction recognition.
 161    The automatically-generated function `recog' is normally called
 162    through this one.  */
 163
 164 static inline int
 165 recog_memoized (rtx_insn *insn)
 166 {
 167   if (INSN_CODE (insn) < 0)
 168     INSN_CODE (insn) = recog (PATTERN (insn), insn, 0);
 169   return INSN_CODE (insn);
 170 }
 171 #endif
 172
 173 /* Skip chars until the next ',' or the end of the string.  This is
 174    useful to skip alternatives in a constraint string.  */
 175 static inline const char *
 176 skip_alternative (const char *p)
 177 {
 178   const char *r = p;
 179   while (*r != '\0' && *r != ',')
 180     r++;
 181   if (*r == ',')
 182     r++;
 183   return r;
 184 }
 185
 186 /* Nonzero means volatile operands are recognized.  */
 187 extern int volatile_ok;
 188
 189 /* Set by constrain_operands to the number of the alternative that
 190    matched.  */
 191 extern int which_alternative;
 192
 193 /* The following vectors hold the results from insn_extract.  */
 194
 195 struct recog_data_d
 196 {
 197   /* It is very tempting to make the 5 operand related arrays into a
 198      structure and index on that.  However, to be source compatible
 199      with all of the existing md file insn constraints and output
 200      templates, we need `operand' as a flat array.  Without that
 201      member, making an array for the rest seems pointless.  */
 202
 203   /* Gives value of operand N.  */
 204   rtx operand[MAX_RECOG_OPERANDS];
 205
 206   /* Gives location where operand N was found.  */
 207   rtx *operand_loc[MAX_RECOG_OPERANDS];
 208
 209   /* Gives the constraint string for operand N.  */
 210   const char *constraints[MAX_RECOG_OPERANDS];
 211
 212   /* Nonzero if operand N is a match_operator or a match_parallel.  */
 213   char is_operator[MAX_RECOG_OPERANDS];
 214
 215   /* Gives the mode of operand N.  */
 216   machine_mode operand_mode[MAX_RECOG_OPERANDS];
 217
 218   /* Gives the type (in, out, inout) for operand N.  */
 219   enum op_type operand_type[MAX_RECOG_OPERANDS];
 220
 221   /* Gives location where the Nth duplicate-appearance of an operand
 222      was found.  This is something that matched MATCH_DUP.  */
 223   rtx *dup_loc[MAX_DUP_OPERANDS];
 224
 225   /* Gives the operand number that was duplicated in the Nth
 226      duplicate-appearance of an operand.  */
 227   char dup_num[MAX_DUP_OPERANDS];
 228
 229   /* ??? Note that these are `char' instead of `unsigned char' to (try to)
 230      avoid certain lossage from K&R C, wherein `unsigned char' default
 231      promotes to `unsigned int' instead of `int' as in ISO C.  As of 1999,
 232      the most common places to bootstrap from K&R C are SunOS and HPUX,
 233      both of which have signed characters by default.  The only other
 234      supported natives that have both K&R C and unsigned characters are
 235      ROMP and Irix 3, and neither have been seen for a while, but do
 236      continue to consider unsignedness when performing arithmetic inside
 237      a comparison.  */
 238
 239   /* The number of operands of the insn.  */
 240   char n_operands;
 241
 242   /* The number of MATCH_DUPs in the insn.  */
 243   char n_dups;
 244
 245   /* The number of alternatives in the constraints for the insn.  */
 246   char n_alternatives;
 247
 248   /* True if insn is ASM_OPERANDS.  */
 249   bool is_asm;
 250
 251   /* In case we are caching, hold insn data was generated for.  */
 252   rtx_insn *insn;
 253 };
 254
 255 extern struct recog_data_d recog_data;
 256
 257 extern const operand_alternative *recog_op_alt;
 258
 259 /* Return a pointer to an array in which index OP describes the constraints
 260    on operand OP of the current instruction alternative (which_alternative).
 261    Only valid after calling preprocess_constraints and constrain_operands.  */
 262
 263 inline static const operand_alternative *
 264 which_op_alt ()
 265 {
 266   gcc_checking_assert (IN_RANGE (which_alternative, 0,
 267                                  recog_data.n_alternatives - 1));
 268   return &recog_op_alt[which_alternative * recog_data.n_operands];
 269 }
 270
 271 /* A table defined in insn-output.c that give information about
 272    each insn-code value.  */
 273
 274 typedef int (*insn_operand_predicate_fn) (rtx, machine_mode);
 275 typedef const char * (*insn_output_fn) (rtx *, rtx_insn *);
 276
 277 struct insn_gen_fn
 278 {
 279   typedef rtx_insn * (*f0) (void);
 280   typedef rtx_insn * (*f1) (rtx);
 281   typedef rtx_insn * (*f2) (rtx, rtx);
 282   typedef rtx_insn * (*f3) (rtx, rtx, rtx);
 283   typedef rtx_insn * (*f4) (rtx, rtx, rtx, rtx);
 284   typedef rtx_insn * (*f5) (rtx, rtx, rtx, rtx, rtx);
 285   typedef rtx_insn * (*f6) (rtx, rtx, rtx, rtx, rtx, rtx);
 286   typedef rtx_insn * (*f7) (rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 287   typedef rtx_insn * (*f8) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 288   typedef rtx_insn * (*f9) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 289   typedef rtx_insn * (*f10) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 290   typedef rtx_insn * (*f11) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 291   typedef rtx_insn * (*f12) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 292   typedef rtx_insn * (*f13) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 293   typedef rtx_insn * (*f14) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 294   typedef rtx_insn * (*f15) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 295   typedef rtx_insn * (*f16) (rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx, rtx);
 296
 297   typedef void (*stored_funcptr) (void);
 298
 299   rtx_insn * operator () (void) const { return ((f0)func) (); }
 300   rtx_insn * operator () (rtx a0) const { return ((f1)func) (a0); }
 301   rtx_insn * operator () (rtx a0, rtx a1) const { return ((f2)func) (a0, a1); }
 302   rtx_insn * operator () (rtx a0, rtx a1, rtx a2) const { return ((f3)func) (a0, a1, a2); }
 303   rtx_insn * operator () (rtx a0, rtx a1, rtx a2, rtx a3) const { return ((f4)func) (a0, a1, a2, a3); }
 304   rtx_insn * operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4) const { return ((f5)func) (a0, a1, a2, a3, a4); }
 305   rtx_insn * operator () (rtx a0, rtx a1, rtx a2, rtx a3, rtx a4, rtx a5) const { return ((f6)func) (a0, a1, a2, a3, a4, a5); }
 306   rtx_insn * 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); }
 307   rtx_insn * 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); }
 308   rtx_insn * 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); }
 309   rtx_insn * 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); }
 310   rtx_insn * 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); }
 311   rtx_insn * 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); }
 312   rtx_insn * 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); }
 313   rtx_insn * 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); }
 314   rtx_insn * 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); }
 315   rtx_insn * 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); }
 316
 317   // This is for compatibility of code that invokes functions like
 318   //   (*funcptr) (arg)
 319   insn_gen_fn operator * (void) const { return *this; }
 320
 321   // The wrapped function pointer must be public and there must not be any
 322   // constructors.  Otherwise the insn_data_d struct initializers generated
 323   // by genoutput.c will result in static initializer functions, which defeats
 324   // the purpose of the generated insn_data_d array.
 325   stored_funcptr func;
 326 };
 327
 328 struct insn_operand_data
 329 {
 330   const insn_operand_predicate_fn predicate;
 331
 332   const char *const constraint;
 333
 334   ENUM_BITFIELD(machine_mode) const mode : 16;
 335
 336   const char strict_low;
 337
 338   const char is_operator;
 339
 340   const char eliminable;
 341
 342   const char allows_mem;
 343 };
 344
 345 /* Legal values for insn_data.output_format.  Indicate what type of data
 346    is stored in insn_data.output.  */
 347 #define INSN_OUTPUT_FORMAT_NONE         0       /* abort */
 348 #define INSN_OUTPUT_FORMAT_SINGLE       1       /* const char * */
 349 #define INSN_OUTPUT_FORMAT_MULTI        2       /* const char * const * */
 350 #define INSN_OUTPUT_FORMAT_FUNCTION     3       /* const char * (*)(...) */
 351
 352 struct insn_data_d
 353 {
 354   const char *const name;
 355 #if HAVE_DESIGNATED_UNION_INITIALIZERS
 356   union {
 357     const char *single;
 358     const char *const *multi;
 359     insn_output_fn function;
 360   } output;
 361 #else
 362   struct {
 363     const char *single;
 364     const char *const *multi;
 365     insn_output_fn function;
 366   } output;
 367 #endif
 368   const insn_gen_fn genfun;
 369   const struct insn_operand_data *const operand;
 370
 371   const char n_generator_args;
 372   const char n_operands;
 373   const char n_dups;
 374   const char n_alternatives;
 375   const char output_format;
 376 };
 377
 378 extern const struct insn_data_d insn_data[];
 379 extern int peep2_current_count;
 380
 381 #ifndef GENERATOR_FILE
 382 #include "insn-codes.h"
 383
 384 /* An enum of boolean attributes that may only depend on the current
 385    subtarget, not on things like operands or compiler phase.  */
 386 enum bool_attr {
 387   BA_ENABLED,
 388   BA_PREFERRED_FOR_SPEED,
 389   BA_PREFERRED_FOR_SIZE,
 390   BA_LAST = BA_PREFERRED_FOR_SIZE
 391 };
 392
 393 /* Target-dependent globals.  */
 394 struct target_recog {
 395   bool x_initialized;
 396   alternative_mask x_bool_attr_masks[NUM_INSN_CODES][BA_LAST + 1];
 397   operand_alternative *x_op_alt[NUM_INSN_CODES];
 398 };
 399
 400 extern struct target_recog default_target_recog;
 401 #if SWITCHABLE_TARGET
 402 extern struct target_recog *this_target_recog;
 403 #else
 404 #define this_target_recog (&default_target_recog)
 405 #endif
 406
 407 alternative_mask get_enabled_alternatives (rtx_insn *);
 408 alternative_mask get_preferred_alternatives (rtx_insn *);
 409 alternative_mask get_preferred_alternatives (rtx_insn *, basic_block);
 410 bool check_bool_attrs (rtx_insn *);
 411
 412 void recog_init ();
 413 #endif
 414
 415 #endif /* GCC_RECOG_H */