1 | /* Generate from machine description: |
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2 | |
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3 | - some #define configuration flags. |
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4 | Copyright (C) 1987, 1991 Free Software Foundation, Inc. |
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5 | |
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6 | This file is part of GNU CC. |
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7 | |
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8 | GNU CC is free software; you can redistribute it and/or modify |
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9 | it under the terms of the GNU General Public License as published by |
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10 | the Free Software Foundation; either version 2, or (at your option) |
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11 | any later version. |
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12 | |
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13 | GNU CC is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License 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 GNU CC; see the file COPYING. If not, write to |
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20 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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21 | Boston, MA 02111-1307, USA. */ |
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22 | |
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23 | |
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24 | #include <stdio.h> |
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25 | #include "hconfig.h" |
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26 | #include "rtl.h" |
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27 | #include "obstack.h" |
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28 | |
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29 | static struct obstack obstack; |
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30 | struct obstack *rtl_obstack = &obstack; |
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31 | |
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32 | #define obstack_chunk_alloc xmalloc |
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33 | #define obstack_chunk_free free |
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34 | |
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35 | extern void free (); |
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36 | extern rtx read_rtx (); |
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37 | |
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38 | /* flags to determine output of machine description dependent #define's. */ |
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39 | static int max_recog_operands; /* Largest operand number seen. */ |
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40 | static int max_dup_operands; /* Largest number of match_dup in any insn. */ |
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41 | static int max_clobbers_per_insn; |
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42 | static int register_constraint_flag; |
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43 | static int have_cc0_flag; |
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44 | static int have_cmove_flag; |
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45 | static int have_lo_sum_flag; |
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46 | |
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47 | /* Maximum number of insns seen in a split. */ |
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48 | static int max_insns_per_split = 1; |
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49 | |
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50 | static int clobbers_seen_this_insn; |
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51 | static int dup_operands_seen_this_insn; |
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52 | |
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53 | char *xmalloc (); |
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54 | static void fatal (); |
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55 | void fancy_abort (); |
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56 | |
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57 | /* RECOG_P will be non-zero if this pattern was seen in a context where it will |
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58 | be used to recognize, rather than just generate an insn. |
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59 | |
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60 | NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC |
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61 | of a SET whose destination is not (pc). */ |
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62 | |
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63 | static void |
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64 | walk_insn_part (part, recog_p, non_pc_set_src) |
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65 | rtx part; |
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66 | int recog_p; |
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67 | int non_pc_set_src; |
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68 | { |
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69 | register int i, j; |
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70 | register RTX_CODE code; |
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71 | register char *format_ptr; |
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72 | |
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73 | if (part == 0) |
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74 | return; |
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75 | |
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76 | code = GET_CODE (part); |
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77 | switch (code) |
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78 | { |
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79 | case CLOBBER: |
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80 | clobbers_seen_this_insn++; |
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81 | break; |
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82 | |
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83 | case MATCH_OPERAND: |
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84 | if (XINT (part, 0) > max_recog_operands) |
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85 | max_recog_operands = XINT (part, 0); |
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86 | if (XSTR (part, 2) && *XSTR (part, 2)) |
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87 | register_constraint_flag = 1; |
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88 | return; |
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89 | |
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90 | case MATCH_OP_DUP: |
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91 | case MATCH_PAR_DUP: |
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92 | ++dup_operands_seen_this_insn; |
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93 | case MATCH_SCRATCH: |
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94 | case MATCH_PARALLEL: |
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95 | case MATCH_OPERATOR: |
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96 | if (XINT (part, 0) > max_recog_operands) |
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97 | max_recog_operands = XINT (part, 0); |
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98 | /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or |
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99 | MATCH_PARALLEL. */ |
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100 | break; |
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101 | |
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102 | case LABEL_REF: |
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103 | if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND) |
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104 | break; |
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105 | return; |
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106 | |
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107 | case MATCH_DUP: |
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108 | ++dup_operands_seen_this_insn; |
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109 | if (XINT (part, 0) > max_recog_operands) |
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110 | max_recog_operands = XINT (part, 0); |
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111 | return; |
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112 | |
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113 | case CC0: |
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114 | if (recog_p) |
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115 | have_cc0_flag = 1; |
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116 | return; |
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117 | |
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118 | case LO_SUM: |
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119 | if (recog_p) |
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120 | have_lo_sum_flag = 1; |
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121 | return; |
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122 | |
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123 | case SET: |
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124 | walk_insn_part (SET_DEST (part), 0, recog_p); |
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125 | walk_insn_part (SET_SRC (part), recog_p, |
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126 | GET_CODE (SET_DEST (part)) != PC); |
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127 | return; |
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128 | |
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129 | case IF_THEN_ELSE: |
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130 | /* Only consider this machine as having a conditional move if the |
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131 | two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise, |
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132 | we have some specific IF_THEN_ELSE construct (like the doz |
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133 | instruction on the RS/6000) that can't be used in the general |
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134 | context we want it for. */ |
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135 | |
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136 | if (recog_p && non_pc_set_src |
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137 | && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND |
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138 | && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND) |
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139 | have_cmove_flag = 1; |
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140 | break; |
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141 | |
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142 | case REG: case CONST_INT: case SYMBOL_REF: |
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143 | case PC: |
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144 | return; |
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145 | } |
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146 | |
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147 | format_ptr = GET_RTX_FORMAT (GET_CODE (part)); |
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148 | |
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149 | for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++) |
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150 | switch (*format_ptr++) |
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151 | { |
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152 | case 'e': |
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153 | case 'u': |
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154 | walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src); |
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155 | break; |
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156 | case 'E': |
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157 | if (XVEC (part, i) != NULL) |
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158 | for (j = 0; j < XVECLEN (part, i); j++) |
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159 | walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src); |
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160 | break; |
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161 | } |
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162 | } |
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163 | |
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164 | static void |
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165 | gen_insn (insn) |
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166 | rtx insn; |
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167 | { |
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168 | int i; |
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169 | |
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170 | /* Walk the insn pattern to gather the #define's status. */ |
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171 | clobbers_seen_this_insn = 0; |
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172 | dup_operands_seen_this_insn = 0; |
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173 | if (XVEC (insn, 1) != 0) |
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174 | for (i = 0; i < XVECLEN (insn, 1); i++) |
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175 | walk_insn_part (XVECEXP (insn, 1, i), 1, 0); |
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176 | |
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177 | if (clobbers_seen_this_insn > max_clobbers_per_insn) |
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178 | max_clobbers_per_insn = clobbers_seen_this_insn; |
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179 | if (dup_operands_seen_this_insn > max_dup_operands) |
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180 | max_dup_operands = dup_operands_seen_this_insn; |
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181 | } |
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182 | |
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183 | /* Similar but scan a define_expand. */ |
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184 | |
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185 | static void |
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186 | gen_expand (insn) |
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187 | rtx insn; |
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188 | { |
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189 | int i; |
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190 | |
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191 | /* Walk the insn pattern to gather the #define's status. */ |
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192 | |
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193 | /* Note that we don't bother recording the number of MATCH_DUPs |
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194 | that occur in a gen_expand, because only reload cares about that. */ |
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195 | if (XVEC (insn, 1) != 0) |
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196 | for (i = 0; i < XVECLEN (insn, 1); i++) |
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197 | { |
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198 | /* Compute the maximum SETs and CLOBBERS |
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199 | in any one of the sub-insns; |
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200 | don't sum across all of them. */ |
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201 | clobbers_seen_this_insn = 0; |
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202 | |
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203 | walk_insn_part (XVECEXP (insn, 1, i), 0, 0); |
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204 | |
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205 | if (clobbers_seen_this_insn > max_clobbers_per_insn) |
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206 | max_clobbers_per_insn = clobbers_seen_this_insn; |
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207 | } |
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208 | } |
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209 | |
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210 | /* Similar but scan a define_split. */ |
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211 | |
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212 | static void |
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213 | gen_split (split) |
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214 | rtx split; |
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215 | { |
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216 | int i; |
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217 | |
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218 | /* Look through the patterns that are matched |
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219 | to compute the maximum operand number. */ |
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220 | for (i = 0; i < XVECLEN (split, 0); i++) |
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221 | walk_insn_part (XVECEXP (split, 0, i), 1, 0); |
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222 | /* Look at the number of insns this insn could split into. */ |
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223 | if (XVECLEN (split, 2) > max_insns_per_split) |
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224 | max_insns_per_split = XVECLEN (split, 2); |
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225 | } |
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226 | |
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227 | static void |
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228 | gen_peephole (peep) |
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229 | rtx peep; |
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230 | { |
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231 | int i; |
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232 | |
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233 | /* Look through the patterns that are matched |
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234 | to compute the maximum operand number. */ |
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235 | for (i = 0; i < XVECLEN (peep, 0); i++) |
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236 | walk_insn_part (XVECEXP (peep, 0, i), 1, 0); |
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237 | } |
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238 | |
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239 | char * |
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240 | xmalloc (size) |
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241 | unsigned size; |
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242 | { |
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243 | register char *val = (char *) malloc (size); |
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244 | |
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245 | if (val == 0) |
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246 | fatal ("virtual memory exhausted"); |
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247 | |
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248 | return val; |
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249 | } |
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250 | |
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251 | char * |
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252 | xrealloc (ptr, size) |
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253 | char *ptr; |
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254 | unsigned size; |
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255 | { |
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256 | char *result = (char *) realloc (ptr, size); |
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257 | if (!result) |
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258 | fatal ("virtual memory exhausted"); |
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259 | return result; |
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260 | } |
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261 | |
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262 | static void |
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263 | fatal (s, a1, a2) |
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264 | char *s; |
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265 | { |
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266 | fprintf (stderr, "genconfig: "); |
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267 | fprintf (stderr, s, a1, a2); |
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268 | fprintf (stderr, "\n"); |
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269 | exit (FATAL_EXIT_CODE); |
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270 | } |
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271 | |
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272 | /* More 'friendly' abort that prints the line and file. |
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273 | config.h can #define abort fancy_abort if you like that sort of thing. */ |
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274 | |
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275 | void |
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276 | fancy_abort () |
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277 | { |
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278 | fatal ("Internal gcc abort."); |
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279 | } |
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280 | |
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281 | int |
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282 | main (argc, argv) |
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283 | int argc; |
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284 | char **argv; |
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285 | { |
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286 | rtx desc; |
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287 | FILE *infile; |
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288 | register int c; |
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289 | |
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290 | obstack_init (rtl_obstack); |
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291 | |
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292 | if (argc <= 1) |
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293 | fatal ("No input file name."); |
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294 | |
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295 | infile = fopen (argv[1], "r"); |
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296 | if (infile == 0) |
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297 | { |
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298 | perror (argv[1]); |
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299 | exit (FATAL_EXIT_CODE); |
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300 | } |
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301 | |
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302 | init_rtl (); |
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303 | |
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304 | printf ("/* Generated automatically by the program `genconfig'\n\ |
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305 | from the machine description file `md'. */\n\n"); |
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306 | |
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307 | /* Allow at least 10 operands for the sake of asm constructs. */ |
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308 | max_recog_operands = 9; /* We will add 1 later. */ |
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309 | max_dup_operands = 1; |
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310 | |
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311 | /* Read the machine description. */ |
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312 | |
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313 | while (1) |
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314 | { |
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315 | c = read_skip_spaces (infile); |
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316 | if (c == EOF) |
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317 | break; |
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318 | ungetc (c, infile); |
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319 | |
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320 | desc = read_rtx (infile); |
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321 | if (GET_CODE (desc) == DEFINE_INSN) |
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322 | gen_insn (desc); |
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323 | if (GET_CODE (desc) == DEFINE_EXPAND) |
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324 | gen_expand (desc); |
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325 | if (GET_CODE (desc) == DEFINE_SPLIT) |
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326 | gen_split (desc); |
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327 | if (GET_CODE (desc) == DEFINE_PEEPHOLE) |
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328 | gen_peephole (desc); |
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329 | } |
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330 | |
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331 | printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1); |
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332 | |
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333 | printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands); |
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334 | |
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335 | /* This is conditionally defined, in case the user writes code which emits |
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336 | more splits than we can readily see (and knows s/he does it). */ |
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337 | printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n", |
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338 | max_insns_per_split); |
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339 | |
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340 | if (register_constraint_flag) |
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341 | printf ("#define REGISTER_CONSTRAINTS\n"); |
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342 | |
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343 | if (have_cc0_flag) |
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344 | printf ("#define HAVE_cc0\n"); |
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345 | |
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346 | if (have_cmove_flag) |
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347 | printf ("#define HAVE_conditional_move\n"); |
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348 | |
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349 | if (have_lo_sum_flag) |
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350 | printf ("#define HAVE_lo_sum\n"); |
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351 | |
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352 | fflush (stdout); |
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353 | exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); |
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354 | /* NOTREACHED */ |
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355 | return 0; |
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356 | } |
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