gcc/gensupport.h

   1 /* Declarations for rtx-reader support for gen* routines.
   2    Copyright (C) 2000-2023 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_GENSUPPORT_H
  21 #define GCC_GENSUPPORT_H
  22
  23 #include "hash-set.h"
  24 #include "read-md.h"
  25
  26 struct obstack;
  27 extern struct obstack *rtl_obstack;
  28
  29 /* Information about an .md define_* rtx.  */
  30 class md_rtx_info {
  31 public:
  32   /* The rtx itself.  */
  33   rtx def;
  34
  35   /* The location of the first line of the rtx.  */
  36   file_location loc;
  37
  38   /* The unique number attached to the rtx.  Currently all define_insns,
  39      define_expands, define_splits, define_peepholes and define_peephole2s
  40      share the same insn_code index space.  */
  41   int index;
  42 };
  43
  44 #define OPTAB_CL(name, pat, c, b, l)            name,
  45 #define OPTAB_CX(name, pat)
  46 #define OPTAB_CD(name, pat)                     name,
  47 #define OPTAB_NL(name, pat, c, b, s, l)         name,
  48 #define OPTAB_NC(name, pat, c)                  name,
  49 #define OPTAB_NX(name, pat)
  50 #define OPTAB_VL(name, pat, c, b, s, l)         name,
  51 #define OPTAB_VC(name, pat, c)                  name,
  52 #define OPTAB_VX(name, pat)
  53 #define OPTAB_DC(name, pat, c)                  name,
  54 #define OPTAB_D(name, pat)                      name,
  55
  56 /* Enumerates all optabs.  */
  57 typedef enum optab_tag {
  58   unknown_optab,
  59 #include "optabs.def"
  60   NUM_OPTABS
  61 } optab;
  62
  63 #undef OPTAB_CL
  64 #undef OPTAB_CX
  65 #undef OPTAB_CD
  66 #undef OPTAB_NL
  67 #undef OPTAB_NC
  68 #undef OPTAB_NX
  69 #undef OPTAB_VL
  70 #undef OPTAB_VC
  71 #undef OPTAB_VX
  72 #undef OPTAB_DC
  73 #undef OPTAB_D
  74
  75 /* Describes one entry in optabs.def.  */
  76 struct optab_def
  77 {
  78   /* The name of the optab (e.g. "add_optab").  */
  79   const char *name;
  80
  81   /* The pattern that matching define_expands and define_insns have.
  82      See the comment at the head of optabs.def for details.  */
  83   const char *pattern;
  84
  85   /* The initializers (in the form of C code) for the libcall_basename,
  86      libcall_suffix and libcall_gen fields of (convert_)optab_libcall_d.  */
  87   const char *base;
  88   const char *suffix;
  89   const char *libcall;
  90
  91   /* The optab's enum value.  */
  92   unsigned int op;
  93
  94   /* The value returned by optab_to_code (OP).  */
  95   enum rtx_code fcode;
  96
  97   /* CODE if code_to_optab (CODE) should return OP, otherwise UNKNOWN.  */
  98   enum rtx_code rcode;
  99
 100   /* 1: conversion optabs with libcall data,
 101      2: conversion optabs without libcall data,
 102      3: non-conversion optabs with libcall data ("normal" and "overflow"
 103         optabs in the optabs.def comment)
 104      4: non-conversion optabs without libcall data ("direct" optabs).  */
 105   unsigned int kind;
 106 };
 107
 108 extern optab_def optabs[];
 109 extern unsigned int num_optabs;
 110
 111 /* Information about an instruction name that matches an optab pattern.  */
 112 struct optab_pattern
 113 {
 114   /* The name of the instruction.  */
 115   const char *name;
 116
 117   /* The matching optab.  */
 118   unsigned int op;
 119
 120   /* The optab modes.  M2 is only significant for conversion optabs;
 121      it is zero otherwise.  */
 122   unsigned int m1, m2;
 123
 124   /* An index that provides a lexicographical sort of (OP, M2, M1).
 125      Used by genopinit.cc.  */
 126   unsigned int sort_num;
 127 };
 128
 129 extern rtx add_implicit_parallel (rtvec);
 130 extern rtx_reader *init_rtx_reader_args_cb (int, const char **,
 131                                             bool (*)(const char *));
 132 extern rtx_reader *init_rtx_reader_args (int, const char **);
 133 extern bool read_md_rtx (md_rtx_info *);
 134 extern unsigned int get_num_insn_codes ();
 135
 136 /* Set this to 0 to disable automatic elision of insn patterns which
 137    can never be used in this configuration.  See genconditions.cc.
 138    Must be set before calling init_md_reader.  */
 139 extern int insn_elision;
 140
 141 /* Return the C test that says whether a definition rtx can be used,
 142    or "" if it can be used unconditionally.  */
 143 extern const char *get_c_test (rtx);
 144
 145 /* If the C test passed as the argument can be evaluated at compile
 146    time, return its truth value; else return -1.  The test must have
 147    appeared somewhere in the machine description when genconditions
 148    was run.  */
 149 extern int maybe_eval_c_test (const char *);
 150
 151 /* Add an entry to the table of conditions.  Used by genconditions and
 152    by read-rtl.cc.  */
 153 extern void add_c_test (const char *, int);
 154
 155 /* This structure is used internally by gensupport.cc and genconditions.cc.  */
 156 struct c_test
 157 {
 158   const char *expr;
 159   int value;
 160 };
 161
 162 #ifdef __HASHTAB_H__
 163 extern hashval_t hash_c_test (const void *);
 164 extern int cmp_c_test (const void *, const void *);
 165 extern void traverse_c_tests (htab_trav, void *);
 166 #endif
 167
 168 /* Predicate handling: helper functions and data structures.  */
 169
 170 struct pred_data
 171 {
 172   struct pred_data *next;       /* for iterating over the set of all preds */
 173   const char *name;             /* predicate name */
 174   bool special;                 /* special handling of modes? */
 175
 176   /* data used primarily by genpreds.cc */
 177   const char *c_block;          /* C test block */
 178   rtx exp;                      /* RTL test expression */
 179
 180   /* data used primarily by genrecog.cc */
 181   enum rtx_code singleton;      /* if pred takes only one code, that code */
 182   int num_codes;                /* number of codes accepted */
 183   bool allows_non_lvalue;       /* if pred allows non-lvalue expressions */
 184   bool allows_non_const;        /* if pred allows non-const expressions */
 185   bool codes[NUM_RTX_CODE];     /* set of codes accepted */
 186 };
 187
 188 extern struct pred_data *first_predicate;
 189 extern struct pred_data *lookup_predicate (const char *);
 190 extern void add_predicate_code (struct pred_data *, enum rtx_code);
 191 extern void add_predicate (struct pred_data *);
 192
 193 #define FOR_ALL_PREDICATES(p) for (p = first_predicate; p; p = p->next)
 194
 195 struct pattern_stats
 196 {
 197   /* The largest match_operand, match_operator or match_parallel
 198      number found.  */
 199   int max_opno;
 200
 201   /* The largest match_dup, match_op_dup or match_par_dup number found.  */
 202   int max_dup_opno;
 203
 204   /* The smallest and largest match_scratch number found.  */
 205   int min_scratch_opno;
 206   int max_scratch_opno;
 207
 208   /* The number of times match_dup, match_op_dup or match_par_dup appears
 209      in the pattern.  */
 210   int num_dups;
 211
 212   /* The number of rtx arguments to the generator function.  */
 213   int num_generator_args;
 214
 215   /* The number of rtx operands in an insn.  */
 216   int num_insn_operands;
 217
 218   /* The number of operand variables that are needed.  */
 219   int num_operand_vars;
 220 };
 221
 222 extern hash_set<rtx> compact_syntax;
 223
 224 extern void get_pattern_stats (struct pattern_stats *ranges, rtvec vec);
 225 extern void compute_test_codes (rtx, file_location, char *);
 226 extern file_location get_file_location (rtx);
 227 extern const char *get_emit_function (rtx);
 228 extern bool needs_barrier_p (rtx);
 229 extern bool find_optab (optab_pattern *, const char *);
 230
 231 #endif /* GCC_GENSUPPORT_H */