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 #include "read-md.h"
  24
  25 struct obstack;
  26 extern struct obstack *rtl_obstack;
  27
  28 /* Information about an .md define_* rtx.  */
  29 struct md_rtx_info {
  30   /* The rtx itself.  */
  31   rtx def;
  32
  33   /* The location of the first line of the rtx.  */
  34   file_location loc;
  35
  36   /* The unique number attached to the rtx.  Currently all define_insns,
  37      define_expands, define_splits, define_peepholes and define_peephole2s
  38      share the same insn_code index space.  */
  39   int index;
  40 };
  41
  42 extern rtx add_implicit_parallel (rtvec);
  43 extern bool init_rtx_reader_args_cb (int, char **, bool (*)(const char *));
  44 extern bool init_rtx_reader_args (int, char **);
  45 extern bool read_md_rtx (md_rtx_info *);
  46
  47 /* Set this to 0 to disable automatic elision of insn patterns which
  48    can never be used in this configuration.  See genconditions.c.
  49    Must be set before calling init_md_reader.  */
  50 extern int insn_elision;
  51
  52 /* If the C test passed as the argument can be evaluated at compile
  53    time, return its truth value; else return -1.  The test must have
  54    appeared somewhere in the machine description when genconditions
  55    was run.  */
  56 extern int maybe_eval_c_test (const char *);
  57
  58 /* Add an entry to the table of conditions.  Used by genconditions and
  59    by read-rtl.c.  */
  60 extern void add_c_test (const char *, int);
  61
  62 /* This structure is used internally by gensupport.c and genconditions.c.  */
  63 struct c_test
  64 {
  65   const char *expr;
  66   int value;
  67 };
  68
  69 #ifdef __HASHTAB_H__
  70 extern hashval_t hash_c_test (const void *);
  71 extern int cmp_c_test (const void *, const void *);
  72 extern void traverse_c_tests (htab_trav, void *);
  73 #endif
  74
  75 /* Predicate handling: helper functions and data structures.  */
  76
  77 struct pred_data
  78 {
  79   struct pred_data *next;       /* for iterating over the set of all preds */
  80   const char *name;             /* predicate name */
  81   bool special;                 /* special handling of modes? */
  82
  83   /* data used primarily by genpreds.c */
  84   const char *c_block;          /* C test block */
  85   rtx exp;                      /* RTL test expression */
  86
  87   /* data used primarily by genrecog.c */
  88   enum rtx_code singleton;      /* if pred takes only one code, that code */
  89   int num_codes;                /* number of codes accepted */
  90   bool allows_non_lvalue;       /* if pred allows non-lvalue expressions */
  91   bool allows_non_const;        /* if pred allows non-const expressions */
  92   bool codes[NUM_RTX_CODE];     /* set of codes accepted */
  93 };
  94
  95 extern struct pred_data *first_predicate;
  96 extern struct pred_data *lookup_predicate (const char *);
  97 extern void add_predicate_code (struct pred_data *, enum rtx_code);
  98 extern void add_predicate (struct pred_data *);
  99
 100 #define FOR_ALL_PREDICATES(p) for (p = first_predicate; p; p = p->next)
 101
 102 struct pattern_stats
 103 {
 104   /* The largest match_operand, match_operator or match_parallel
 105      number found.  */
 106   int max_opno;
 107
 108   /* The largest match_dup, match_op_dup or match_par_dup number found.  */
 109   int max_dup_opno;
 110
 111   /* The largest match_scratch number found.  */
 112   int max_scratch_opno;
 113
 114   /* The number of times match_dup, match_op_dup or match_par_dup appears
 115      in the pattern.  */
 116   int num_dups;
 117
 118   /* The number of rtx arguments to the generator function.  */
 119   int num_generator_args;
 120
 121   /* The number of rtx operands in an insn.  */
 122   int num_insn_operands;
 123
 124   /* The number of operand variables that are needed.  */
 125   int num_operand_vars;
 126 };
 127
 128 extern void get_pattern_stats (struct pattern_stats *ranges, rtvec vec);
 129 extern void compute_test_codes (rtx, file_location, char *);
 130 extern const char *get_emit_function (rtx);
 131 extern bool needs_barrier_p (rtx);
 132
 133 #endif /* GCC_GENSUPPORT_H */