gcc/rtlhash.c

   1 /* RTL hash functions.
   2    Copyright (C) 1987-2017 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 #include "config.h"
  21 #include "system.h"
  22 #include "coretypes.h"
  23 #include "tm.h"
  24 #include "rtl.h"
  25 #include "rtlhash.h"
  26
  27 namespace inchash
  28 {
  29
  30 /* Iteratively hash rtx X into HSTATE.  */
  31
  32 void
  33 add_rtx (const_rtx x, hash &hstate)
  34 {
  35   enum rtx_code code;
  36   machine_mode mode;
  37   int i, j;
  38   const char *fmt;
  39
  40   if (x == NULL_RTX)
  41     return;
  42   code = GET_CODE (x);
  43   hstate.add_object (code);
  44   mode = GET_MODE (x);
  45   hstate.add_object (mode);
  46   switch (code)
  47     {
  48     case REG:
  49       hstate.add_int (REGNO (x));
  50       return;
  51     case CONST_INT:
  52       hstate.add_object (INTVAL (x));
  53       return;
  54     case CONST_WIDE_INT:
  55       for (i = 0; i < CONST_WIDE_INT_NUNITS (x); i++)
  56         hstate.add_object (CONST_WIDE_INT_ELT (x, i));
  57       return;
  58     case SYMBOL_REF:
  59       if (XSTR (x, 0))
  60         hstate.add (XSTR (x, 0), strlen (XSTR (x, 0)) + 1);
  61       return;
  62     case LABEL_REF:
  63     case DEBUG_EXPR:
  64     case VALUE:
  65     case SCRATCH:
  66     case CONST_DOUBLE:
  67     case CONST_FIXED:
  68     case DEBUG_IMPLICIT_PTR:
  69     case DEBUG_PARAMETER_REF:
  70       return;
  71     default:
  72       break;
  73     }
  74
  75   fmt = GET_RTX_FORMAT (code);
  76   for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
  77     switch (fmt[i])
  78       {
  79       case 'w':
  80         hstate.add_object (XWINT (x, i));
  81         break;
  82       case 'n':
  83       case 'i':
  84         hstate.add_object (XINT (x, i));
  85         break;
  86       case 'V':
  87       case 'E':
  88         j = XVECLEN (x, i);
  89         hstate.add_int (j);
  90         for (j = 0; j < XVECLEN (x, i); j++)
  91           inchash::add_rtx (XVECEXP (x, i, j), hstate);
  92         break;
  93       case 'e':
  94         inchash::add_rtx (XEXP (x, i), hstate);
  95         break;
  96       case 'S':
  97       case 's':
  98         if (XSTR (x, i))
  99           hstate.add (XSTR (x, 0), strlen (XSTR (x, 0)) + 1);
 100         break;
 101       default:
 102         break;
 103       }
 104 }
 105
 106 }