gcc/recog.h

   1 /* Declarations for interface to insn recognizer and insn-output.c.
   2    Copyright (C) 1987, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  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 class;
  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 'm' was found in the constraint string.  */
  54   unsigned int memory_ok:1;
  55   /* Nonzero if 'o' was found in the constraint string.  */
  56   unsigned int offmem_ok:1;
  57   /* Nonzero if 'V' was found in the constraint string.  */
  58   unsigned int nonoffmem_ok:1;
  59   /* Nonzero if '<' was found in the constraint string.  */
  60   unsigned int decmem_ok:1;
  61   /* Nonzero if '>' was found in the constraint string.  */
  62   unsigned int incmem_ok:1;
  63   /* Nonzero if 'X' was found in the constraint string, or if the constraint
  64      string for this alternative was empty.  */
  65   unsigned int anything_ok:1;
  66 };
  67
  68
  69 extern void init_recog                  PROTO((void));
  70 extern void init_recog_no_volatile      PROTO((void));
  71 extern int recog_memoized               PROTO((rtx));
  72 extern int check_asm_operands           PROTO((rtx));
  73 extern int asm_operand_ok               PROTO((rtx, const char *));
  74 extern int validate_change              PROTO((rtx, rtx *, rtx, int));
  75 extern int apply_change_group           PROTO((void));
  76 extern int num_validated_changes        PROTO((void));
  77 extern void cancel_changes              PROTO((int));
  78 extern int constrain_operands           PROTO((int));
  79 extern int memory_address_p             PROTO((enum machine_mode, rtx));
  80 extern int strict_memory_address_p      PROTO((enum machine_mode, rtx));
  81 extern int validate_replace_rtx         PROTO((rtx, rtx, rtx));
  82 extern void validate_replace_rtx_group  PROTO((rtx, rtx, rtx));
  83 extern int validate_replace_src         PROTO((rtx, rtx, rtx));
  84 #ifdef HAVE_cc0
  85 extern int next_insn_tests_no_inequality PROTO ((rtx));
  86 #endif
  87 extern int reg_fits_class_p             PROTO((rtx, enum reg_class, int,
  88                                                enum machine_mode));
  89 extern rtx *find_single_use             PROTO((rtx, rtx, rtx *));
  90
  91 extern int general_operand              PROTO((rtx, enum machine_mode));
  92 extern int address_operand              PROTO((rtx, enum machine_mode));
  93 extern int register_operand             PROTO((rtx, enum machine_mode));
  94 extern int scratch_operand              PROTO((rtx, enum machine_mode));
  95 extern int immediate_operand            PROTO((rtx, enum machine_mode));
  96 extern int const_int_operand            PROTO((rtx, enum machine_mode));
  97 extern int const_double_operand         PROTO((rtx, enum machine_mode));
  98 extern int nonimmediate_operand         PROTO((rtx, enum machine_mode));
  99 extern int nonmemory_operand            PROTO((rtx, enum machine_mode));
 100 extern int push_operand                 PROTO((rtx, enum machine_mode));
 101 extern int pop_operand                  PROTO((rtx, enum machine_mode));
 102 extern int memory_operand               PROTO((rtx, enum machine_mode));
 103 extern int indirect_operand             PROTO((rtx, enum machine_mode));
 104 extern int mode_independent_operand     PROTO((rtx, enum machine_mode));
 105 extern int comparison_operator          PROTO((rtx, enum machine_mode));
 106
 107 extern int offsettable_memref_p         PROTO((rtx));
 108 extern int offsettable_nonstrict_memref_p       PROTO((rtx));
 109 extern int offsettable_address_p        PROTO((int, enum machine_mode, rtx));
 110 extern int mode_dependent_address_p     PROTO((rtx));
 111
 112 extern int recog                        PROTO((rtx, rtx, int *));
 113 extern void add_clobbers                PROTO((rtx, int));
 114 extern void insn_extract                PROTO((rtx));
 115 extern void extract_insn                PROTO((rtx));
 116 extern void preprocess_constraints      PROTO((void));
 117 extern rtx recog_next_insn              PROTO((rtx, int));
 118 extern void peephole2_optimize          PROTO((FILE *));
 119 extern rtx peephole2_insns              PROTO((rtx, rtx, rtx *));
 120
 121 /* Nonzero means volatile operands are recognized.  */
 122 extern int volatile_ok;
 123
 124 /* Set by constrain_operands to the number of the alternative that
 125    matched.  */
 126 extern int which_alternative;
 127
 128 /* The following vectors hold the results from insn_extract.  */
 129
 130 struct recog_data
 131 {
 132   /* It is very tempting to make the 5 operand related arrays into a
 133      structure and index on that.  However, to be source compatible
 134      with all of the existing md file insn constraints and output
 135      templates, we need `operand' as a flat array.  Without that
 136      member, making an array for the rest seems pointless.  */
 137
 138   /* Gives value of operand N.  */
 139   rtx operand[MAX_RECOG_OPERANDS];
 140
 141   /* Gives location where operand N was found.  */
 142   rtx *operand_loc[MAX_RECOG_OPERANDS];
 143
 144   /* Gives the constraint string for operand N.  */
 145   const char *constraints[MAX_RECOG_OPERANDS];
 146
 147   /* Gives the mode of operand N.  */
 148   enum machine_mode operand_mode[MAX_RECOG_OPERANDS];
 149
 150   /* Gives the type (in, out, inout) for operand N.  */
 151   enum op_type operand_type[MAX_RECOG_OPERANDS];
 152
 153   /* Gives location where the Nth duplicate-appearance of an operand
 154      was found.  This is something that matched MATCH_DUP.  */
 155   rtx *dup_loc[MAX_DUP_OPERANDS];
 156
 157   /* Gives the operand number that was duplicated in the Nth
 158      duplicate-appearance of an operand.  */
 159   char dup_num[MAX_DUP_OPERANDS];
 160
 161   /* ??? Note that these are `char' instead of `unsigned char' to (try to)
 162      avoid certain lossage from K&R C, wherein `unsigned char' default
 163      promotes to `unsigned int' instead of `int' as in ISO C.  As of 1999,
 164      the most common places to bootstrap from K&R C are SunOS and HPUX,
 165      both of which have signed characters by default.  The only other
 166      supported natives that have both K&R C and unsigned characters are
 167      ROMP and Irix 3, and neither have been seen for a while, but do
 168      continue to consider unsignedness when performing arithmetic inside
 169      a comparison.  */
 170
 171   /* The number of operands of the insn.  */
 172   char n_operands;
 173
 174   /* The number of MATCH_DUPs in the insn.  */
 175   char n_dups;
 176
 177   /* The number of alternatives in the constraints for the insn.  */
 178   char n_alternatives;
 179 };
 180
 181 extern struct recog_data recog_data;
 182
 183 /* Contains a vector of operand_alternative structures for every operand.
 184    Set up by preprocess_constraints.  */
 185 extern struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES];
 186
 187 /* Access the output function for CODE.  */
 188
 189 #define OUT_FCN(CODE) (*insn_data[(int) (CODE)].outfun)
 190
 191 /* A table defined in insn-output.c that give information about
 192    each insn-code value.  */
 193
 194 typedef int (*insn_operand_predicate_fn) PROTO ((rtx, enum machine_mode));
 195 typedef const char * (*insn_output_fn) PROTO ((rtx *, rtx));
 196 #ifndef NO_MD_PROTOTYPES
 197 typedef rtx (*insn_gen_fn) PROTO ((rtx, ...));
 198 #else
 199 typedef rtx (*insn_gen_fn) ();
 200 #endif
 201
 202 struct insn_operand_data
 203 {
 204   insn_operand_predicate_fn predicate;
 205
 206   const char *constraint;
 207
 208   enum machine_mode mode;
 209
 210   char strict_low;
 211 };
 212
 213 /* Legal values for insn_data.output_format.  Indicate what type of data
 214    is stored in insn_data.output.  */
 215 #define INSN_OUTPUT_FORMAT_NONE         0       /* abort */
 216 #define INSN_OUTPUT_FORMAT_SINGLE       1       /* const char * */
 217 #define INSN_OUTPUT_FORMAT_MULTI        2       /* const char * const * */
 218 #define INSN_OUTPUT_FORMAT_FUNCTION     3       /* const char * (*)(...) */
 219
 220 struct insn_data
 221 {
 222   const char *name;
 223   const PTR output;
 224   insn_gen_fn genfun;
 225   const struct insn_operand_data *operand;
 226
 227   char n_operands;
 228   char n_dups;
 229   char n_alternatives;
 230   char output_format;
 231 };
 232
 233 extern const struct insn_data insn_data[];