gcc/gensupport.h

   1 /* Declarations for rtx-reader support for gen* routines.
   2    Copyright (C) 2000-2015 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 struct obstack;
  24 extern struct obstack *rtl_obstack;
  25
  26 extern rtx add_implicit_parallel (rtvec);
  27 extern bool init_rtx_reader_args_cb (int, char **, bool (*)(const char *));
  28 extern bool init_rtx_reader_args (int, char **);
  29 extern rtx read_md_rtx (int *, int *);
  30
  31 /* Set this to 0 to disable automatic elision of insn patterns which
  32    can never be used in this configuration.  See genconditions.c.
  33    Must be set before calling init_md_reader.  */
  34 extern int insn_elision;
  35
  36 /* If the C test passed as the argument can be evaluated at compile
  37    time, return its truth value; else return -1.  The test must have
  38    appeared somewhere in the machine description when genconditions
  39    was run.  */
  40 extern int maybe_eval_c_test (const char *);
  41
  42 /* Add an entry to the table of conditions.  Used by genconditions and
  43    by read-rtl.c.  */
  44 extern void add_c_test (const char *, int);
  45
  46 /* This structure is used internally by gensupport.c and genconditions.c.  */
  47 struct c_test
  48 {
  49   const char *expr;
  50   int value;
  51 };
  52
  53 #ifdef __HASHTAB_H__
  54 extern hashval_t hash_c_test (const void *);
  55 extern int cmp_c_test (const void *, const void *);
  56 extern void traverse_c_tests (htab_trav, void *);
  57 #endif
  58
  59 /* Predicate handling: helper functions and data structures.  */
  60
  61 struct pred_data
  62 {
  63   struct pred_data *next;       /* for iterating over the set of all preds */
  64   const char *name;             /* predicate name */
  65   bool special;                 /* special handling of modes? */
  66
  67   /* data used primarily by genpreds.c */
  68   const char *c_block;          /* C test block */
  69   rtx exp;                      /* RTL test expression */
  70
  71   /* data used primarily by genrecog.c */
  72   enum rtx_code singleton;      /* if pred takes only one code, that code */
  73   int num_codes;                /* number of codes accepted */
  74   bool allows_non_lvalue;       /* if pred allows non-lvalue expressions */
  75   bool allows_non_const;        /* if pred allows non-const expressions */
  76   bool codes[NUM_RTX_CODE];     /* set of codes accepted */
  77 };
  78
  79 extern struct pred_data *first_predicate;
  80 extern struct pred_data *lookup_predicate (const char *);
  81 extern void add_predicate_code (struct pred_data *, enum rtx_code);
  82 extern void add_predicate (struct pred_data *);
  83
  84 #define FOR_ALL_PREDICATES(p) for (p = first_predicate; p; p = p->next)
  85
  86 struct pattern_stats
  87 {
  88   /* The largest match_operand, match_operator or match_parallel
  89      number found.  */
  90   int max_opno;
  91
  92   /* The largest match_dup, match_op_dup or match_par_dup number found.  */
  93   int max_dup_opno;
  94
  95   /* The largest match_scratch number found.  */
  96   int max_scratch_opno;
  97
  98   /* The number of times match_dup, match_op_dup or match_par_dup appears
  99      in the pattern.  */
 100   int num_dups;
 101
 102   /* The number of rtx arguments to the generator function.  */
 103   int num_generator_args;
 104
 105   /* The number of rtx operands in an insn.  */
 106   int num_insn_operands;
 107
 108   /* The number of operand variables that are needed.  */
 109   int num_operand_vars;
 110 };
 111
 112 extern void get_pattern_stats (struct pattern_stats *ranges, rtvec vec);
 113 extern void compute_test_codes (rtx, int, char *);
 114 extern const char *get_emit_function (rtx);
 115 extern bool needs_barrier_p (rtx);
 116
 117 #endif /* GCC_GENSUPPORT_H */