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1 684 jeremybenn
/* Declarations for interface to insn recognizer and insn-output.c.
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   Copyright (C) 1987, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004,
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   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.  */
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#ifndef GCC_RECOG_H
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#define GCC_RECOG_H
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/* Random number that should be large enough for all purposes.  */
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#define MAX_RECOG_ALTERNATIVES 30
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/* Types of operands.  */
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enum op_type {
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  OP_IN,
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  OP_OUT,
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  OP_INOUT
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};
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struct operand_alternative
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{
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  /* Pointer to the beginning of the constraint string for this alternative,
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     for easier access by alternative number.  */
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  const char *constraint;
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  /* The register class valid for this alternative (possibly NO_REGS).  */
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  enum reg_class cl;
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  /* "Badness" of this alternative, computed from number of '?' and '!'
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     characters in the constraint string.  */
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  unsigned int reject;
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  /* -1 if no matching constraint was found, or an operand number.  */
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  int matches;
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  /* The same information, but reversed: -1 if this operand is not
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     matched by any other, or the operand number of the operand that
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     matches this one.  */
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  int matched;
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  /* Nonzero if '&' was found in the constraint string.  */
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  unsigned int earlyclobber:1;
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  /* Nonzero if TARGET_MEM_CONSTRAINT was found in the constraint
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     string.  */
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  unsigned int memory_ok:1;
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  /* Nonzero if 'o' was found in the constraint string.  */
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  unsigned int offmem_ok:1;
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  /* Nonzero if 'V' was found in the constraint string.  */
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  unsigned int nonoffmem_ok:1;
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  /* Nonzero if '<' was found in the constraint string.  */
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  unsigned int decmem_ok:1;
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  /* Nonzero if '>' was found in the constraint string.  */
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  unsigned int incmem_ok:1;
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  /* Nonzero if 'p' was found in the constraint string.  */
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  unsigned int is_address:1;
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  /* Nonzero if 'X' was found in the constraint string, or if the constraint
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     string for this alternative was empty.  */
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  unsigned int anything_ok:1;
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};
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extern void init_recog (void);
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extern void init_recog_no_volatile (void);
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extern int check_asm_operands (rtx);
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extern int asm_operand_ok (rtx, const char *, const char **);
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extern bool validate_change (rtx, rtx *, rtx, bool);
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extern bool validate_unshare_change (rtx, rtx *, rtx, bool);
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extern bool canonicalize_change_group (rtx insn, rtx x);
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extern int insn_invalid_p (rtx);
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extern int verify_changes (int);
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extern void confirm_change_group (void);
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extern int apply_change_group (void);
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extern int num_validated_changes (void);
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extern void cancel_changes (int);
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extern int constrain_operands (int);
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extern int constrain_operands_cached (int);
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extern int memory_address_addr_space_p (enum machine_mode, rtx, addr_space_t);
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#define memory_address_p(mode,addr) \
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        memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
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extern int strict_memory_address_addr_space_p (enum machine_mode, rtx,
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                                               addr_space_t);
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#define strict_memory_address_p(mode,addr) \
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        strict_memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
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extern int validate_replace_rtx_subexp (rtx, rtx, rtx, rtx *);
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extern int validate_replace_rtx (rtx, rtx, rtx);
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extern int validate_replace_rtx_part (rtx, rtx, rtx *, rtx);
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extern int validate_replace_rtx_part_nosimplify (rtx, rtx, rtx *, rtx);
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extern void validate_replace_rtx_group (rtx, rtx, rtx);
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extern void validate_replace_src_group (rtx, rtx, rtx);
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extern bool validate_simplify_insn (rtx insn);
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extern int num_changes_pending (void);
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#ifdef HAVE_cc0
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extern int next_insn_tests_no_inequality (rtx);
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#endif
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extern bool reg_fits_class_p (const_rtx, reg_class_t, int, enum machine_mode);
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extern int offsettable_memref_p (rtx);
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extern int offsettable_nonstrict_memref_p (rtx);
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extern int offsettable_address_addr_space_p (int, enum machine_mode, rtx,
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                                             addr_space_t);
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#define offsettable_address_p(strict,mode,addr) \
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        offsettable_address_addr_space_p ((strict), (mode), (addr), \
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                                          ADDR_SPACE_GENERIC)
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extern bool mode_dependent_address_p (rtx);
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extern int recog (rtx, rtx, int *);
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#ifndef GENERATOR_FILE
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static inline int recog_memoized (rtx insn);
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#endif
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extern void add_clobbers (rtx, int);
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extern int added_clobbers_hard_reg_p (int);
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extern void insn_extract (rtx);
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extern void extract_insn (rtx);
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extern void extract_constrain_insn_cached (rtx);
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extern void extract_insn_cached (rtx);
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extern void preprocess_constraints (void);
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extern rtx peep2_next_insn (int);
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extern int peep2_regno_dead_p (int, int);
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extern int peep2_reg_dead_p (int, rtx);
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#ifdef CLEAR_HARD_REG_SET
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extern rtx peep2_find_free_register (int, int, const char *,
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                                     enum machine_mode, HARD_REG_SET *);
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#endif
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extern rtx peephole2_insns (rtx, rtx, int *);
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extern int store_data_bypass_p (rtx, rtx);
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extern int if_test_bypass_p (rtx, rtx);
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#ifndef GENERATOR_FILE
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/* Try recognizing the instruction INSN,
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   and return the code number that results.
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   Remember the code so that repeated calls do not
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   need to spend the time for actual rerecognition.
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   This function is the normal interface to instruction recognition.
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   The automatically-generated function `recog' is normally called
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   through this one.  */
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static inline int
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recog_memoized (rtx insn)
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{
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  if (INSN_CODE (insn) < 0)
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    INSN_CODE (insn) = recog (PATTERN (insn), insn, 0);
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  return INSN_CODE (insn);
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}
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#endif
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/* Skip chars until the next ',' or the end of the string.  This is
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   useful to skip alternatives in a constraint string.  */
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static inline const char *
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skip_alternative (const char *p)
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{
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  const char *r = p;
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  while (*r != '\0' && *r != ',')
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    r++;
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  if (*r == ',')
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    r++;
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  return r;
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}
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/* Nonzero means volatile operands are recognized.  */
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extern int volatile_ok;
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/* Set by constrain_operands to the number of the alternative that
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   matched.  */
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extern int which_alternative;
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/* The following vectors hold the results from insn_extract.  */
182
 
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struct recog_data
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{
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  /* It is very tempting to make the 5 operand related arrays into a
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     structure and index on that.  However, to be source compatible
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     with all of the existing md file insn constraints and output
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     templates, we need `operand' as a flat array.  Without that
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     member, making an array for the rest seems pointless.  */
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  /* Gives value of operand N.  */
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  rtx operand[MAX_RECOG_OPERANDS];
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  /* Gives location where operand N was found.  */
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  rtx *operand_loc[MAX_RECOG_OPERANDS];
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  /* Gives the constraint string for operand N.  */
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  const char *constraints[MAX_RECOG_OPERANDS];
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  /* Nonzero if operand N is a match_operator or a match_parallel.  */
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  char is_operator[MAX_RECOG_OPERANDS];
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  /* Gives the mode of operand N.  */
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  enum machine_mode operand_mode[MAX_RECOG_OPERANDS];
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  /* Gives the type (in, out, inout) for operand N.  */
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  enum op_type operand_type[MAX_RECOG_OPERANDS];
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  /* Gives location where the Nth duplicate-appearance of an operand
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     was found.  This is something that matched MATCH_DUP.  */
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  rtx *dup_loc[MAX_DUP_OPERANDS];
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  /* Gives the operand number that was duplicated in the Nth
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     duplicate-appearance of an operand.  */
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  char dup_num[MAX_DUP_OPERANDS];
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  /* ??? Note that these are `char' instead of `unsigned char' to (try to)
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     avoid certain lossage from K&R C, wherein `unsigned char' default
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     promotes to `unsigned int' instead of `int' as in ISO C.  As of 1999,
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     the most common places to bootstrap from K&R C are SunOS and HPUX,
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     both of which have signed characters by default.  The only other
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     supported natives that have both K&R C and unsigned characters are
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     ROMP and Irix 3, and neither have been seen for a while, but do
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     continue to consider unsignedness when performing arithmetic inside
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     a comparison.  */
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  /* The number of operands of the insn.  */
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  char n_operands;
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230
  /* The number of MATCH_DUPs in the insn.  */
231
  char n_dups;
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233
  /* The number of alternatives in the constraints for the insn.  */
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  char n_alternatives;
235
 
236
  /* True if insn is ASM_OPERANDS.  */
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  bool is_asm;
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  /* Specifies whether an insn alternative is enabled using the
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     `enabled' attribute in the insn pattern definition.  For back
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     ends not using the `enabled' attribute the array fields are
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     always set to `true' in expand_insn.  */
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  bool alternative_enabled_p [MAX_RECOG_ALTERNATIVES];
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  /* In case we are caching, hold insn data was generated for.  */
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  rtx insn;
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};
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extern struct recog_data recog_data;
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/* Contains a vector of operand_alternative structures for every operand.
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   Set up by preprocess_constraints.  */
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extern struct operand_alternative recog_op_alt[MAX_RECOG_OPERANDS][MAX_RECOG_ALTERNATIVES];
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/* A table defined in insn-output.c that give information about
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   each insn-code value.  */
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typedef int (*insn_operand_predicate_fn) (rtx, enum machine_mode);
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typedef const char * (*insn_output_fn) (rtx *, rtx);
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typedef rtx (*insn_gen_fn) (rtx, ...);
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262
struct insn_operand_data
263
{
264
  const insn_operand_predicate_fn predicate;
265
 
266
  const char *const constraint;
267
 
268
  ENUM_BITFIELD(machine_mode) const mode : 16;
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270
  const char strict_low;
271
 
272
  const char is_operator;
273
 
274
  const char eliminable;
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276
  const char allows_mem;
277
};
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/* Legal values for insn_data.output_format.  Indicate what type of data
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   is stored in insn_data.output.  */
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#define INSN_OUTPUT_FORMAT_NONE         0        /* abort */
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#define INSN_OUTPUT_FORMAT_SINGLE       1       /* const char * */
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#define INSN_OUTPUT_FORMAT_MULTI        2       /* const char * const * */
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#define INSN_OUTPUT_FORMAT_FUNCTION     3       /* const char * (*)(...) */
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286
struct insn_data_d
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{
288
  const char *const name;
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#if HAVE_DESIGNATED_UNION_INITIALIZERS
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  union {
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    const char *single;
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    const char *const *multi;
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    insn_output_fn function;
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  } output;
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#else
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  struct {
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    const char *single;
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    const char *const *multi;
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    insn_output_fn function;
300
  } output;
301
#endif
302
  const insn_gen_fn genfun;
303
  const struct insn_operand_data *const operand;
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  const char n_generator_args;
306
  const char n_operands;
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  const char n_dups;
308
  const char n_alternatives;
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  const char output_format;
310
};
311
 
312
extern const struct insn_data_d insn_data[];
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extern int peep2_current_count;
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#endif /* GCC_RECOG_H */

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