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1 /* Process machine description and calculate constant conditions.
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2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007
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3 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 /* In a machine description, all of the insn patterns - define_insn,
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22 define_expand, define_split, define_peephole, define_peephole2 -
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23 contain an optional C expression which makes the final decision
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24 about whether or not this pattern is usable. That expression may
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25 turn out to be always false when the compiler is built. If it is,
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26 most of the programs that generate code from the machine
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27 description can simply ignore the entire pattern. */
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28
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29 #include "bconfig.h"
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30 #include "system.h"
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31 #include "coretypes.h"
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32 #include "tm.h"
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33 #include "rtl.h"
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34 #include "errors.h"
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35 #include "hashtab.h"
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36 #include "gensupport.h"
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37
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38 /* so we can include except.h in the generated file. */
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39 static int saw_eh_return;
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40
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41 static void write_header (void);
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42 static void write_conditions (void);
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43 static int write_one_condition (void **, void *);
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44
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45 /* Generate the header for insn-conditions.c. */
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46
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47 static void
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48 write_header (void)
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49 {
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50 puts ("\
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51 /* Generated automatically by the program `genconditions' from the target\n\
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52 machine description file. */\n\
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53 \n\
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54 #include \"bconfig.h\"\n\
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55 #include \"system.h\"\n\
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56 \n\
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57 /* It is necessary, but not entirely safe, to include the headers below\n\
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58 in a generator program. As a defensive measure, don't do so when the\n\
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59 table isn't going to have anything in it. */\n\
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60 #if GCC_VERSION >= 3001\n\
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61 \n\
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62 /* Do not allow checking to confuse the issue. */\n\
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63 #undef ENABLE_CHECKING\n\
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64 #undef ENABLE_TREE_CHECKING\n\
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65 #undef ENABLE_RTL_CHECKING\n\
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66 #undef ENABLE_RTL_FLAG_CHECKING\n\
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67 #undef ENABLE_GC_CHECKING\n\
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68 #undef ENABLE_GC_ALWAYS_COLLECT\n\
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69 \n\
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70 #include \"coretypes.h\"\n\
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71 #include \"tm.h\"\n\
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72 #include \"insn-constants.h\"\n\
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73 #include \"rtl.h\"\n\
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74 #include \"tm_p.h\"\n\
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75 #include \"function.h\"\n\
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76 \n\
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77 /* Fake - insn-config.h doesn't exist yet. */\n\
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78 #define MAX_RECOG_OPERANDS 10\n\
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79 #define MAX_DUP_OPERANDS 10\n\
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80 #define MAX_INSNS_PER_SPLIT 5\n\
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81 \n\
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82 #include \"regs.h\"\n\
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83 #include \"recog.h\"\n\
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84 #include \"output.h\"\n\
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85 #include \"flags.h\"\n\
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86 #include \"hard-reg-set.h\"\n\
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87 #include \"resource.h\"\n\
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88 #include \"toplev.h\"\n\
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89 #include \"reload.h\"\n\
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90 #include \"tm-constrs.h\"\n");
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91
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92 if (saw_eh_return)
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93 puts ("#define HAVE_eh_return 1");
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94 puts ("#include \"except.h\"\n");
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95
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96 puts ("\
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97 /* Dummy external declarations. */\n\
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98 extern rtx insn;\n\
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99 extern rtx ins1;\n\
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100 extern rtx operands[];\n\
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101 \n\
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102 #endif /* gcc >= 3.0.1 */\n");
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103 }
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104
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105 /* Write out one entry in the conditions table, using the data pointed
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106 to by SLOT. Each entry looks like this:
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107
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108 { "! optimize_size && ! TARGET_READ_MODIFY_WRITE",
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109 __builtin_constant_p (! optimize_size && ! TARGET_READ_MODIFY_WRITE)
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110 ? (int) (! optimize_size && ! TARGET_READ_MODIFY_WRITE)
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111 : -1) }, */
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112
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113 static int
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114 write_one_condition (void **slot, void * ARG_UNUSED (dummy))
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115 {
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116 const struct c_test *test = * (const struct c_test **) slot;
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117 const char *p;
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118
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119 print_rtx_ptr_loc (test->expr);
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120 fputs (" { \"", stdout);
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121 for (p = test->expr; *p; p++)
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122 {
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123 switch (*p)
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124 {
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125 case '\n': fputs ("\\n\\", stdout); break;
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126 case '\\':
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127 case '\"': putchar ('\\'); break;
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128 default: break;
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129 }
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130 putchar (*p);
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131 }
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132
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133 fputs ("\",\n __builtin_constant_p ", stdout);
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134 print_c_condition (test->expr);
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135 fputs ("\n ? (int) ", stdout);
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136 print_c_condition (test->expr);
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137 fputs ("\n : -1 },\n", stdout);
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138 return 1;
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139 }
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140
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141 /* Write out the complete conditions table, its size, and a flag
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142 indicating that gensupport.c can now do insn elision. */
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143 static void
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144 write_conditions (void)
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145 {
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146 puts ("\
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147 /* Structure definition duplicated from gensupport.h rather than\n\
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148 drag in that file and its dependencies. */\n\
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149 struct c_test\n\
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150 {\n\
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151 const char *expr;\n\
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152 int value;\n\
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153 };\n\
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154 \n\
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155 /* This table lists each condition found in the machine description.\n\
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156 Each condition is mapped to its truth value (0 or 1), or -1 if that\n\
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157 cannot be calculated at compile time.\n\
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158 If we don't have __builtin_constant_p, or it's not acceptable in array\n\
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159 initializers, fall back to assuming that all conditions potentially\n\
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160 vary at run time. It works in 3.0.1 and later; 3.0 only when not\n\
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161 optimizing. */\n\
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162 \n\
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163 #if GCC_VERSION >= 3001\n\
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164 static const struct c_test insn_conditions[] = {\n");
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165
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166 traverse_c_tests (write_one_condition, 0);
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167
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168 puts ("\n};\n#endif /* gcc >= 3.0.1 */\n");
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169 }
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170
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171 /* Emit code which will convert the C-format table to a
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172 (define_conditions) form, which the MD reader can understand.
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173 The result will be added to the set of files scanned by
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174 'downstream' generators. */
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175 static void
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176 write_writer (void)
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177 {
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178 puts ("int\n"
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179 "main(void)\n"
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180 "{\n"
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181 " unsigned int i;\n"
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182 " const char *p;\n"
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183 " puts (\"(define_conditions [\");\n"
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184 "#if GCC_VERSION >= 3001\n"
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185 " for (i = 0; i < ARRAY_SIZE (insn_conditions); i++)\n"
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186 " {\n"
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187 " printf (\" (%d \\\"\", insn_conditions[i].value);\n"
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188 " for (p = insn_conditions[i].expr; *p; p++)\n"
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189 " {\n"
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190 " switch (*p)\n"
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191 " {\n"
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192 " case '\\\\':\n"
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193 " case '\\\"': putchar ('\\\\'); break;\n"
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194 " default: break;\n"
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195 " }\n"
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196 " putchar (*p);\n"
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197 " }\n"
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198 " puts (\"\\\")\");\n"
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199 " }\n"
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200 "#endif /* gcc >= 3.0.1 */\n"
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201 " puts (\"])\");\n"
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202 " fflush (stdout);\n"
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203 "return ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE;\n"
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204 "}");
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205 }
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206
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207 int
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208 main (int argc, char **argv)
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209 {
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210 rtx desc;
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211 int pattern_lineno; /* not used */
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212 int code;
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213
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214 progname = "genconditions";
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215
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216 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
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217 return (FATAL_EXIT_CODE);
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218
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219 /* Read the machine description. */
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220 while (1)
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221 {
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222 desc = read_md_rtx (&pattern_lineno, &code);
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223 if (desc == NULL)
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224 break;
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225
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226 /* N.B. define_insn_and_split, define_cond_exec are handled
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227 entirely within read_md_rtx; we never see them. */
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228 switch (GET_CODE (desc))
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229 {
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230 default:
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231 break;
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232
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233 case DEFINE_INSN:
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234 case DEFINE_EXPAND:
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235 add_c_test (XSTR (desc, 2), -1);
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236 /* except.h needs to know whether there is an eh_return
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237 pattern in the machine description. */
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238 if (!strcmp (XSTR (desc, 0), "eh_return"))
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239 saw_eh_return = 1;
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240 break;
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241
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242 case DEFINE_SPLIT:
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243 case DEFINE_PEEPHOLE:
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244 case DEFINE_PEEPHOLE2:
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245 add_c_test (XSTR (desc, 1), -1);
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246 break;
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247 }
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248 }
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249
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250 write_header ();
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251 write_conditions ();
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252 write_writer ();
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253
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254 fflush (stdout);
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255 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
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256 }
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