0
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1 /* Generate attribute information (insn-attr.h) from machine description.
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2 Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008
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3 Free Software Foundation, Inc.
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4 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22
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23 #include "bconfig.h"
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24 #include "system.h"
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25 #include "coretypes.h"
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26 #include "tm.h"
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27 #include "rtl.h"
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28 #include "errors.h"
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29 #include "gensupport.h"
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30
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31
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32 static void write_upcase (const char *);
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33 static void gen_attr (rtx);
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34
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35 static void
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36 write_upcase (const char *str)
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37 {
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38 for (; *str; str++)
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39 putchar (TOUPPER(*str));
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40 }
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41
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42 static void
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43 gen_attr (rtx attr)
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44 {
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45 const char *p, *tag;
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46 int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
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47
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48 printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
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49
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50 /* If numeric attribute, don't need to write an enum. */
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51 p = XSTR (attr, 1);
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52 if (*p == '\0')
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53 printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
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54 (is_const ? "void" : "rtx"));
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55 else
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56 {
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57 printf ("enum attr_%s {", XSTR (attr, 0));
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58
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59 while ((tag = scan_comma_elt (&p)) != 0)
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60 {
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61 write_upcase (XSTR (attr, 0));
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62 putchar ('_');
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63 while (tag != p)
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64 putchar (TOUPPER (*tag++));
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65 if (*p == ',')
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66 fputs (", ", stdout);
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67 }
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68
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69 fputs ("};\n", stdout);
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70 printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
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71 XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
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72 }
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73
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74 /* If `length' attribute, write additional function definitions and define
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75 variables used by `insn_current_length'. */
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76 if (! strcmp (XSTR (attr, 0), "length"))
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77 {
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78 puts ("\
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79 extern void shorten_branches (rtx);\n\
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80 extern int insn_default_length (rtx);\n\
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81 extern int insn_min_length (rtx);\n\
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82 extern int insn_variable_length_p (rtx);\n\
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83 extern int insn_current_length (rtx);\n\n\
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84 #include \"insn-addr.h\"\n");
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85 }
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86 }
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87
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88 int
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89 main (int argc, char **argv)
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90 {
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91 rtx desc;
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92 int have_delay = 0;
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93 int have_annul_true = 0;
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94 int have_annul_false = 0;
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95 int num_insn_reservations = 0;
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96 int i;
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97
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98 progname = "genattr";
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99
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100 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
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101 return (FATAL_EXIT_CODE);
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102
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103 puts ("/* Generated automatically by the program `genattr'");
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104 puts (" from the machine description file `md'. */\n");
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105 puts ("#ifndef GCC_INSN_ATTR_H");
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106 puts ("#define GCC_INSN_ATTR_H\n");
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107
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108 /* For compatibility, define the attribute `alternative', which is just
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109 a reference to the variable `which_alternative'. */
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110
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111 puts ("#define HAVE_ATTR_alternative");
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112 puts ("#define get_attr_alternative(insn) which_alternative");
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113
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114 /* Read the machine description. */
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115
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116 while (1)
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117 {
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118 int line_no, insn_code_number;
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119
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120 desc = read_md_rtx (&line_no, &insn_code_number);
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121 if (desc == NULL)
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122 break;
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123
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124 if (GET_CODE (desc) == DEFINE_ATTR)
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125 gen_attr (desc);
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126
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127 else if (GET_CODE (desc) == DEFINE_DELAY)
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128 {
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129 if (! have_delay)
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130 {
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131 printf ("#define DELAY_SLOTS\n");
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132 printf ("extern int num_delay_slots (rtx);\n");
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133 printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n");
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134 printf ("extern int const_num_delay_slots (rtx);\n\n");
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135 have_delay = 1;
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136 }
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137
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138 for (i = 0; i < XVECLEN (desc, 1); i += 3)
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139 {
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140 if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
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141 {
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142 printf ("#define ANNUL_IFTRUE_SLOTS\n");
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143 printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n");
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144 have_annul_true = 1;
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145 }
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146
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147 if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
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148 {
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149 printf ("#define ANNUL_IFFALSE_SLOTS\n");
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150 printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n");
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151 have_annul_false = 1;
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152 }
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153 }
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154 }
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155
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156 else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
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157 num_insn_reservations++;
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158 }
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159
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160 if (num_insn_reservations > 0)
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161 {
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162 /* Output interface for pipeline hazards recognition based on
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163 DFA (deterministic finite state automata. */
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164 printf ("\n#define INSN_SCHEDULING\n");
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165 printf ("\n/* DFA based pipeline interface. */");
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166 printf ("\n#ifndef AUTOMATON_ALTS\n");
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167 printf ("#define AUTOMATON_ALTS 0\n");
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168 printf ("#endif\n\n");
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169 printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
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170 printf ("#define AUTOMATON_STATE_ALTS 0\n");
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171 printf ("#endif\n\n");
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172 printf ("#ifndef CPU_UNITS_QUERY\n");
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173 printf ("#define CPU_UNITS_QUERY 0\n");
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174 printf ("#endif\n\n");
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175 /* Interface itself: */
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176 printf ("/* Internal insn code number used by automata. */\n");
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177 printf ("extern int internal_dfa_insn_code (rtx);\n\n");
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178 printf ("/* Insn latency time defined in define_insn_reservation. */\n");
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179 printf ("extern int insn_default_latency (rtx);\n\n");
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180 printf ("/* Return nonzero if there is a bypass for given insn\n");
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181 printf (" which is a data producer. */\n");
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182 printf ("extern int bypass_p (rtx);\n\n");
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183 printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
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184 printf (" Use the function if bypass_p returns nonzero for\n");
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185 printf (" the 1st insn. */\n");
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186 printf ("extern int insn_latency (rtx, rtx);\n\n");
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187 printf ("/* Maximal insn latency time possible of all bypasses for this insn.\n");
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188 printf (" Use the function if bypass_p returns nonzero for\n");
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189 printf (" the 1st insn. */\n");
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190 printf ("extern int maximal_insn_latency (rtx);\n\n");
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191 printf ("\n#if AUTOMATON_ALTS\n");
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192 printf ("/* The following function returns number of alternative\n");
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193 printf (" reservations of given insn. It may be used for better\n");
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194 printf (" insns scheduling heuristics. */\n");
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195 printf ("extern int insn_alts (rtx);\n\n");
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196 printf ("#endif\n\n");
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197 printf ("/* Maximal possible number of insns waiting results being\n");
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198 printf (" produced by insns whose execution is not finished. */\n");
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199 printf ("extern const int max_insn_queue_index;\n\n");
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200 printf ("/* Pointer to data describing current state of DFA. */\n");
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201 printf ("typedef void *state_t;\n\n");
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202 printf ("/* Size of the data in bytes. */\n");
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203 printf ("extern int state_size (void);\n\n");
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204 printf ("/* Initiate given DFA state, i.e. Set up the state\n");
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205 printf (" as all functional units were not reserved. */\n");
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206 printf ("extern void state_reset (state_t);\n");
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207 printf ("/* The following function returns negative value if given\n");
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208 printf (" insn can be issued in processor state described by given\n");
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209 printf (" DFA state. In this case, the DFA state is changed to\n");
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210 printf (" reflect the current and future reservations by given\n");
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211 printf (" insn. Otherwise the function returns minimal time\n");
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212 printf (" delay to issue the insn. This delay may be zero\n");
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213 printf (" for superscalar or VLIW processors. If the second\n");
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214 printf (" parameter is NULL the function changes given DFA state\n");
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215 printf (" as new processor cycle started. */\n");
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216 printf ("extern int state_transition (state_t, rtx);\n");
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217 printf ("\n#if AUTOMATON_STATE_ALTS\n");
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218 printf ("/* The following function returns number of possible\n");
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219 printf (" alternative reservations of given insn in given\n");
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220 printf (" DFA state. It may be used for better insns scheduling\n");
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221 printf (" heuristics. By default the function is defined if\n");
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222 printf (" macro AUTOMATON_STATE_ALTS is defined because its\n");
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223 printf (" implementation may require much memory. */\n");
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224 printf ("extern int state_alts (state_t, rtx);\n");
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225 printf ("#endif\n\n");
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226 printf ("extern int min_issue_delay (state_t, rtx);\n");
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227 printf ("/* The following function returns nonzero if no one insn\n");
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228 printf (" can be issued in current DFA state. */\n");
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229 printf ("extern int state_dead_lock_p (state_t);\n");
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230 printf ("/* The function returns minimal delay of issue of the 2nd\n");
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231 printf (" insn after issuing the 1st insn in given DFA state.\n");
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232 printf (" The 1st insn should be issued in given state (i.e.\n");
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233 printf (" state_transition should return negative value for\n");
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234 printf (" the insn and the state). Data dependencies between\n");
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235 printf (" the insns are ignored by the function. */\n");
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236 printf
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237 ("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
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238 printf ("/* The following function outputs reservations for given\n");
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239 printf (" insn as they are described in the corresponding\n");
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240 printf (" define_insn_reservation. */\n");
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241 printf ("extern void print_reservation (FILE *, rtx);\n");
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242 printf ("\n#if CPU_UNITS_QUERY\n");
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243 printf ("/* The following function returns code of functional unit\n");
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244 printf (" with given name (see define_cpu_unit). */\n");
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245 printf ("extern int get_cpu_unit_code (const char *);\n");
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246 printf ("/* The following function returns nonzero if functional\n");
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247 printf (" unit with given code is currently reserved in given\n");
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248 printf (" DFA state. */\n");
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249 printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
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250 printf ("#endif\n\n");
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251 printf ("/* The following function returns true if insn\n");
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252 printf (" has a dfa reservation. */\n");
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253 printf ("extern bool insn_has_dfa_reservation_p (rtx);\n\n");
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254 printf ("/* Clean insn code cache. It should be called if there\n");
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255 printf (" is a chance that condition value in a\n");
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256 printf (" define_insn_reservation will be changed after\n");
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257 printf (" last call of dfa_start. */\n");
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258 printf ("extern void dfa_clean_insn_cache (void);\n\n");
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259 printf ("extern void dfa_clear_single_insn_cache (rtx);\n\n");
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260 printf ("/* Initiate and finish work with DFA. They should be\n");
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261 printf (" called as the first and the last interface\n");
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262 printf (" functions. */\n");
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263 printf ("extern void dfa_start (void);\n");
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264 printf ("extern void dfa_finish (void);\n");
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265 }
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266 else
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267 {
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268 /* Otherwise we do no scheduling, but we need these typedefs
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269 in order to avoid uglifying other code with more ifdefs. */
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270 printf ("typedef void *state_t;\n\n");
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271 }
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272
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273 /* Output flag masks for use by reorg.
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274
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275 Flags are used to hold branch direction and prediction information
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276 for use by eligible_for_... */
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277 printf("\n#define ATTR_FLAG_forward\t0x1\n");
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278 printf("#define ATTR_FLAG_backward\t0x2\n");
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279 printf("#define ATTR_FLAG_likely\t0x4\n");
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280 printf("#define ATTR_FLAG_very_likely\t0x8\n");
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281 printf("#define ATTR_FLAG_unlikely\t0x10\n");
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282 printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
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283
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284 puts("\n#endif /* GCC_INSN_ATTR_H */");
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285
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286 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
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287 return FATAL_EXIT_CODE;
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288
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289 return SUCCESS_EXIT_CODE;
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290 }
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