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1 /* Generate code to allocate RTL structures.
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2 Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 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 it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 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
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22 #include "bconfig.h"
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23 #include "system.h"
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24
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25 struct rtx_definition
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26 {
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27 const char *const enumname, *const name, *const format;
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28 };
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29
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30 /* rtl.def needs CONST_DOUBLE_FORMAT, but we don't care what
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31 CONST_DOUBLE_FORMAT is because we're not going to be generating
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32 anything for CONST_DOUBLE anyway. */
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33 #define CONST_DOUBLE_FORMAT ""
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34
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35 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { #ENUM, NAME, FORMAT },
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36
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37 static const struct rtx_definition defs[] =
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38 {
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39 #include "rtl.def" /* rtl expressions are documented here */
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40 };
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41 #define NUM_RTX_CODE ARRAY_SIZE(defs)
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42
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43 static const char *formats[NUM_RTX_CODE];
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44
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45 static const char *type_from_format (int);
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46 static const char *accessor_from_format (int);
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47 static int special_format (const char *);
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48 static int special_rtx (int);
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49 static int excluded_rtx (int);
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50 static void find_formats (void);
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51 static void gendecl (const char *);
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52 static void genmacro (int);
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53 static void gendef (const char *);
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54 static void genlegend (void);
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55 static void genheader (void);
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56 static void gencode (void);
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57
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58 /* Decode a format letter into a C type string. */
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59
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60 static const char *
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61 type_from_format (int c)
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62 {
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63 switch (c)
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64 {
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65 case 'i':
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66 return "int ";
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67
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68 case 'w':
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69 return "HOST_WIDE_INT ";
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70
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71 case 's':
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72 return "const char *";
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73
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74 case 'e': case 'u':
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75 return "rtx ";
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76
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77 case 'E':
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78 return "rtvec ";
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79 case 'b':
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80 return "struct bitmap_head_def *"; /* bitmap - typedef not available */
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81 case 't':
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82 return "union tree_node *"; /* tree - typedef not available */
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83 case 'B':
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84 return "struct basic_block_def *"; /* basic block - typedef not available */
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85 default:
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86 gcc_unreachable ();
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87 }
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88 }
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89
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90 /* Decode a format letter into the proper accessor function. */
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91
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92 static const char *
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93 accessor_from_format (int c)
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94 {
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95 switch (c)
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96 {
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97 case 'i':
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98 return "XINT";
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99
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100 case 'w':
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101 return "XWINT";
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102
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103 case 's':
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104 return "XSTR";
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105
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106 case 'e': case 'u':
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107 return "XEXP";
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108
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109 case 'E':
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110 return "XVEC";
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111
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112 case 'b':
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113 return "XBITMAP";
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114
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115 case 't':
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116 return "XTREE";
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117
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118 case 'B':
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119 return "XBBDEF";
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120
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121 default:
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122 gcc_unreachable ();
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123 }
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124 }
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125
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126 /* Return nonzero if we should ignore FMT, an RTL format, when making
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127 the list of formats we write routines to create. */
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128
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129 static int
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130 special_format (const char *fmt)
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131 {
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132 return (strchr (fmt, '*') != 0
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133 || strchr (fmt, 'V') != 0
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134 || strchr (fmt, 'S') != 0
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135 || strchr (fmt, 'n') != 0);
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136 }
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137
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138 /* Return nonzero if the RTL code given by index IDX is one that we should
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139 generate a gen_rtx_raw_FOO macro for, not gen_rtx_FOO (because gen_rtx_FOO
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140 is a wrapper in emit-rtl.c). */
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141
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142 static int
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143 special_rtx (int idx)
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144 {
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145 return (strcmp (defs[idx].enumname, "CONST_INT") == 0
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146 || strcmp (defs[idx].enumname, "REG") == 0
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147 || strcmp (defs[idx].enumname, "SUBREG") == 0
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148 || strcmp (defs[idx].enumname, "MEM") == 0
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149 || strcmp (defs[idx].enumname, "CONST_VECTOR") == 0);
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150 }
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151
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152 /* Return nonzero if the RTL code given by index IDX is one that we should
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153 generate no macro for at all (because gen_rtx_FOO is never used or
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154 cannot have the obvious interface). */
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155
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156 static int
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157 excluded_rtx (int idx)
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158 {
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159 return ((strcmp (defs[idx].enumname, "CONST_DOUBLE") == 0)
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160 || (strcmp (defs[idx].enumname, "CONST_FIXED") == 0));
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161 }
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162
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163 /* Place a list of all format specifiers we use into the array FORMAT. */
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164
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165 static void
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166 find_formats (void)
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167 {
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168 unsigned int i;
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169
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170 for (i = 0; i < NUM_RTX_CODE; i++)
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171 {
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172 const char **f;
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173
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174 if (special_format (defs[i].format))
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175 continue;
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176
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177 for (f = formats; *f; f++)
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178 if (! strcmp (*f, defs[i].format))
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179 break;
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180
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181 if (*f == 0)
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182 *f = defs[i].format;
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183 }
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184 }
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185
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186 /* Write the declarations for the routine to allocate RTL with FORMAT. */
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187
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188 static void
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189 gendecl (const char *format)
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190 {
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191 const char *p;
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192 int i, pos;
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193
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194 printf ("extern rtx gen_rtx_fmt_%s_stat\t (RTX_CODE, ", format);
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195 printf ("enum machine_mode mode");
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196
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197 /* Write each parameter that is needed and start a new line when the line
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198 would overflow. */
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199 for (p = format, i = 0, pos = 75; *p != 0; p++)
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200 if (*p != '0')
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201 {
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202 int ourlen = strlen (type_from_format (*p)) + 6 + (i > 9);
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203
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204 printf (",");
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205 if (pos + ourlen > 76)
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206 printf ("\n\t\t\t\t "), pos = 39;
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207
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208 printf (" %sarg%d", type_from_format (*p), i++);
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209 pos += ourlen;
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210 }
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211 printf (" MEM_STAT_DECL");
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212
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213 printf (");\n");
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214 printf ("#define gen_rtx_fmt_%s(c, m", format);
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215 for (p = format, i = 0; *p != 0; p++)
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216 if (*p != '0')
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217 printf (", p%i",i++);
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218 printf (")\\\n gen_rtx_fmt_%s_stat (c, m", format);
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219 for (p = format, i = 0; *p != 0; p++)
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220 if (*p != '0')
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221 printf (", p%i",i++);
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222 printf (" MEM_STAT_INFO)\n\n");
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223 }
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224
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225 /* Generate macros to generate RTL of code IDX using the functions we
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226 write. */
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227
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228 static void
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229 genmacro (int idx)
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230 {
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231 const char *p;
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232 int i;
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233
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234 /* We write a macro that defines gen_rtx_RTLCODE to be an equivalent to
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235 gen_rtx_fmt_FORMAT where FORMAT is the RTX_FORMAT of RTLCODE. */
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236
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237 if (excluded_rtx (idx))
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238 /* Don't define a macro for this code. */
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239 return;
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240
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241 printf ("#define gen_rtx_%s%s(MODE",
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242 special_rtx (idx) ? "raw_" : "", defs[idx].enumname);
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243
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244 for (p = defs[idx].format, i = 0; *p != 0; p++)
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245 if (*p != '0')
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246 printf (", ARG%d", i++);
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247
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248 printf (") \\\n gen_rtx_fmt_%s (%s, (MODE)",
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249 defs[idx].format, defs[idx].enumname);
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250
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251 for (p = defs[idx].format, i = 0; *p != 0; p++)
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252 if (*p != '0')
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253 printf (", (ARG%d)", i++);
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254
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255 puts (")");
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256 }
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257
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258 /* Generate the code for the function to generate RTL whose
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259 format is FORMAT. */
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260
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261 static void
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262 gendef (const char *format)
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263 {
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264 const char *p;
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265 int i, j;
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266
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267 /* Start by writing the definition of the function name and the types
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268 of the arguments. */
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269
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270 printf ("rtx\ngen_rtx_fmt_%s_stat (RTX_CODE code, enum machine_mode mode", format);
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271 for (p = format, i = 0; *p != 0; p++)
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272 if (*p != '0')
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273 printf (",\n\t%sarg%d", type_from_format (*p), i++);
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274
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275 puts (" MEM_STAT_DECL)");
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276
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277 /* Now write out the body of the function itself, which allocates
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278 the memory and initializes it. */
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279 puts ("{");
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280 puts (" rtx rt;");
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281 puts (" rt = rtx_alloc_stat (code PASS_MEM_STAT);\n");
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282
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283 puts (" PUT_MODE (rt, mode);");
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284
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285 for (p = format, i = j = 0; *p ; ++p, ++i)
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286 if (*p != '0')
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287 printf (" %s (rt, %d) = arg%d;\n", accessor_from_format (*p), i, j++);
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288 else
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289 printf (" X0EXP (rt, %d) = NULL_RTX;\n", i);
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290
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291 puts ("\n return rt;\n}\n");
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292 }
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293
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294 /* Generate the documentation header for files we write. */
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295
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296 static void
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297 genlegend (void)
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298 {
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299 puts ("/* Generated automatically by gengenrtl from rtl.def. */\n");
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300 }
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301
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302 /* Generate the text of the header file we make, genrtl.h. */
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303
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304 static void
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305 genheader (void)
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306 {
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307 unsigned int i;
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308 const char **fmt;
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309
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310 puts ("#ifndef GCC_GENRTL_H");
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311 puts ("#define GCC_GENRTL_H\n");
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312 puts ("#include \"statistics.h\"\n");
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313
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314 for (fmt = formats; *fmt; ++fmt)
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315 gendecl (*fmt);
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316
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317 putchar ('\n');
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318
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319 for (i = 0; i < NUM_RTX_CODE; i++)
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320 if (! special_format (defs[i].format))
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321 genmacro (i);
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322
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323 puts ("\n#endif /* GCC_GENRTL_H */");
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324 }
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325
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326 /* Generate the text of the code file we write, genrtl.c. */
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327
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328 static void
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329 gencode (void)
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330 {
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331 const char **fmt;
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332
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333 puts ("#include \"config.h\"");
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334 puts ("#include \"system.h\"");
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335 puts ("#include \"coretypes.h\"");
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336 puts ("#include \"tm.h\"");
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337 puts ("#include \"obstack.h\"");
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338 puts ("#include \"rtl.h\"");
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339 puts ("#include \"ggc.h\"\n");
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340
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341 for (fmt = formats; *fmt != 0; fmt++)
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342 gendef (*fmt);
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343 }
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344
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345 /* This is the main program. We accept only one argument, "-h", which
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346 says we are writing the genrtl.h file. Otherwise we are writing the
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347 genrtl.c file. */
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348
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349 int
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350 main (int argc, char **argv)
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351 {
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352 find_formats ();
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353 genlegend ();
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354
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355 if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'h')
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356 genheader ();
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357 else
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358 gencode ();
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359
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360 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
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361 return FATAL_EXIT_CODE;
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362
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363 return SUCCESS_EXIT_CODE;
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364 }
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