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   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 validate_change              PROTO((rtx, rtx *, rtx, int));
  74 extern int apply_change_group           PROTO((void));
  75 extern int num_validated_changes        PROTO((void));
  76 extern void cancel_changes              PROTO((int));
  77 extern int constrain_operands           PROTO((int));
  78 extern int memory_address_p             PROTO((enum machine_mode, rtx));
  79 extern int strict_memory_address_p      PROTO((enum machine_mode, rtx));
  80 extern int validate_replace_rtx         PROTO((rtx, rtx, rtx));
  81 extern void validate_replace_rtx_group  PROTO((rtx, rtx, rtx));
  82 extern int validate_replace_src         PROTO((rtx, rtx, rtx));
  83 #ifdef HAVE_cc0
  84 extern int next_insn_tests_no_inequality PROTO ((rtx));
  85 #endif
  86 extern int reg_fits_class_p             PROTO((rtx, enum reg_class, int,
  87                                                enum machine_mode));
  88 extern rtx *find_single_use             PROTO((rtx, rtx, rtx *));
  89
  90 extern int general_operand              PROTO((rtx, enum machine_mode));
  91 extern int address_operand              PROTO((rtx, enum machine_mode));
  92 extern int register_operand             PROTO((rtx, enum machine_mode));
  93 extern int scratch_operand              PROTO((rtx, enum machine_mode));
  94 extern int immediate_operand            PROTO((rtx, enum machine_mode));
  95 extern int const_int_operand            PROTO((rtx, enum machine_mode));
  96 extern int const_double_operand         PROTO((rtx, enum machine_mode));
  97 extern int nonimmediate_operand         PROTO((rtx, enum machine_mode));
  98 extern int nonmemory_operand            PROTO((rtx, enum machine_mode));
  99 extern int push_operand                 PROTO((rtx, enum machine_mode));
 100 extern int memory_operand               PROTO((rtx, enum machine_mode));
 101 extern int indirect_operand             PROTO((rtx, enum machine_mode));
 102 extern int mode_independent_operand     PROTO((rtx, enum machine_mode));
 103 extern int comparison_operator          PROTO((rtx, enum machine_mode));
 104
 105 extern int offsettable_memref_p         PROTO((rtx));
 106 extern int offsettable_nonstrict_memref_p       PROTO((rtx));
 107 extern int offsettable_address_p        PROTO((int, enum machine_mode, rtx));
 108 extern int mode_dependent_address_p     PROTO((rtx));
 109
 110 extern int recog                        PROTO((rtx, rtx, int *));
 111 extern void add_clobbers                PROTO((rtx, int));
 112 extern void insn_extract                PROTO((rtx));
 113 extern void extract_insn                PROTO((rtx));
 114 extern void preprocess_constraints      PROTO((void));
 115
 116 /* Nonzero means volatile operands are recognized.  */
 117 extern int volatile_ok;
 118
 119 /* Set by constrain_operands to the number of the alternative that
 120    matched.  */
 121 extern int which_alternative;
 122
 123 /* The following vectors hold the results from insn_extract.  */
 124
 125 /* Indexed by N, gives value of operand N.  */
 126 extern rtx recog_operand[];
 127
 128 /* Indexed by N, gives location where operand N was found.  */
 129 extern rtx *recog_operand_loc[];
 130
 131 /* Indexed by N, gives location where the Nth duplicate-appearance of
 132    an operand was found.  This is something that matched MATCH_DUP.  */
 133 extern rtx *recog_dup_loc[];
 134
 135 /* Indexed by N, gives the operand number that was duplicated in the
 136    Nth duplicate-appearance of an operand.  */
 137 extern char recog_dup_num[];
 138
 139 /* The next variables are set up by extract_insn.  */
 140
 141 /* The number of operands of the insn.  */
 142 extern int recog_n_operands;
 143
 144 /* The number of MATCH_DUPs in the insn.  */
 145 extern int recog_n_dups;
 146
 147 /* The number of alternatives in the constraints for the insn.  */
 148 extern int recog_n_alternatives;
 149
 150 /* Indexed by N, gives the mode of operand N.  */
 151 extern enum machine_mode recog_operand_mode[];
 152
 153 /* Indexed by N, gives the constraint string for operand N.  */
 154 extern char *recog_constraints[];
 155
 156 /* Indexed by N, gives the type (in, out, inout) for operand N.  */
 157 extern enum op_type recog_op_type[];
 158
 159 #ifndef REGISTER_CONSTRAINTS
 160 /* Indexed by N, nonzero if operand N should be an address.  */
 161 extern char recog_operand_address_p[];
 162 #endif
 163
 164 /* Contains a vector of operand_alternative structures for every operand.
 165    Set up by preprocess_constraints.  */
 166 struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES];
 167
 168 /* Access the output function for CODE.  */
 169
 170 #define OUT_FCN(CODE) (*insn_outfun[(int) (CODE)])
 171
 172 /* Tables defined in insn-output.c that give information about
 173    each insn-code value.  */
 174
 175 /* These are vectors indexed by insn-code.  Details in genoutput.c.  */
 176
 177 extern char *const insn_template[];
 178
 179 extern char *(*const insn_outfun[]) ();
 180
 181 extern const int insn_n_operands[];
 182
 183 extern const int insn_n_dups[];
 184
 185 /* Indexed by insn code number, gives # of constraint alternatives.  */
 186
 187 extern const int insn_n_alternatives[];
 188
 189 /* These are two-dimensional arrays indexed first by the insn-code
 190    and second by the operand number.  Details in genoutput.c.  */
 191
 192 #ifdef REGISTER_CONSTRAINTS  /* Avoid undef sym in certain broken linkers.  */
 193 extern char *const insn_operand_constraint[][MAX_RECOG_OPERANDS];
 194 #endif
 195
 196 #ifndef REGISTER_CONSTRAINTS  /* Avoid undef sym in certain broken linkers.  */
 197 extern const char insn_operand_address_p[][MAX_RECOG_OPERANDS];
 198 #endif
 199
 200 extern const enum machine_mode insn_operand_mode[][MAX_RECOG_OPERANDS];
 201
 202 extern const char insn_operand_strict_low[][MAX_RECOG_OPERANDS];
 203
 204 extern int (*const insn_operand_predicate[][MAX_RECOG_OPERANDS]) ();
 205
 206 extern char * insn_name[];