111
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1 /* Expression parser.
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145
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2 Copyright (C) 2000-2020 Free Software Foundation, Inc.
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111
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3 Contributed by Andy Vaught
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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 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "gfortran.h"
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25 #include "arith.h"
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26 #include "match.h"
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27
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28 static const char expression_syntax[] = N_("Syntax error in expression at %C");
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29
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30
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31 /* Match a user-defined operator name. This is a normal name with a
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32 few restrictions. The error_flag controls whether an error is
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33 raised if 'true' or 'false' are used or not. */
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34
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35 match
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36 gfc_match_defined_op_name (char *result, int error_flag)
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37 {
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38 static const char * const badops[] = {
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39 "and", "or", "not", "eqv", "neqv", "eq", "ne", "ge", "le", "lt", "gt",
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40 NULL
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41 };
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42
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43 char name[GFC_MAX_SYMBOL_LEN + 1];
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44 locus old_loc;
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45 match m;
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46 int i;
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47
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48 old_loc = gfc_current_locus;
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49
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50 m = gfc_match (" . %n .", name);
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51 if (m != MATCH_YES)
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52 return m;
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53
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54 /* .true. and .false. have interpretations as constants. Trying to
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55 use these as operators will fail at a later time. */
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56
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57 if (strcmp (name, "true") == 0 || strcmp (name, "false") == 0)
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58 {
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59 if (error_flag)
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60 goto error;
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61 gfc_current_locus = old_loc;
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62 return MATCH_NO;
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63 }
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64
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65 for (i = 0; badops[i]; i++)
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66 if (strcmp (badops[i], name) == 0)
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67 goto error;
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68
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69 for (i = 0; name[i]; i++)
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70 if (!ISALPHA (name[i]))
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71 {
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72 gfc_error ("Bad character %qc in OPERATOR name at %C", name[i]);
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73 return MATCH_ERROR;
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74 }
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75
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76 strcpy (result, name);
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77 return MATCH_YES;
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78
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79 error:
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80 gfc_error ("The name %qs cannot be used as a defined operator at %C",
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81 name);
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82
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83 gfc_current_locus = old_loc;
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84 return MATCH_ERROR;
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85 }
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86
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87
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88 /* Match a user defined operator. The symbol found must be an
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89 operator already. */
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90
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91 static match
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92 match_defined_operator (gfc_user_op **result)
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93 {
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94 char name[GFC_MAX_SYMBOL_LEN + 1];
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95 match m;
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96
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97 m = gfc_match_defined_op_name (name, 0);
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98 if (m != MATCH_YES)
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99 return m;
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100
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101 *result = gfc_get_uop (name);
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102 return MATCH_YES;
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103 }
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104
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105
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106 /* Check to see if the given operator is next on the input. If this
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107 is not the case, the parse pointer remains where it was. */
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108
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109 static int
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110 next_operator (gfc_intrinsic_op t)
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111 {
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112 gfc_intrinsic_op u;
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113 locus old_loc;
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114
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115 old_loc = gfc_current_locus;
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116 if (gfc_match_intrinsic_op (&u) == MATCH_YES && t == u)
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117 return 1;
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118
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119 gfc_current_locus = old_loc;
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120 return 0;
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121 }
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122
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123
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124 /* Call the INTRINSIC_PARENTHESES function. This is both
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125 used explicitly, as below, or by resolve.c to generate
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126 temporaries. */
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127
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128 gfc_expr *
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129 gfc_get_parentheses (gfc_expr *e)
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130 {
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131 gfc_expr *e2;
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132
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133 e2 = gfc_get_operator_expr (&e->where, INTRINSIC_PARENTHESES, e, NULL);
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134 e2->ts = e->ts;
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135 e2->rank = e->rank;
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136
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137 return e2;
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138 }
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139
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140
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141 /* Match a primary expression. */
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142
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143 static match
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144 match_primary (gfc_expr **result)
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145 {
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146 match m;
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147 gfc_expr *e;
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148
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149 m = gfc_match_literal_constant (result, 0);
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150 if (m != MATCH_NO)
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151 return m;
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152
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153 m = gfc_match_array_constructor (result);
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154 if (m != MATCH_NO)
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155 return m;
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156
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157 m = gfc_match_rvalue (result);
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158 if (m != MATCH_NO)
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159 return m;
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160
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161 /* Match an expression in parentheses. */
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162 if (gfc_match_char ('(') != MATCH_YES)
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163 return MATCH_NO;
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164
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165 m = gfc_match_expr (&e);
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166 if (m == MATCH_NO)
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167 goto syntax;
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168 if (m == MATCH_ERROR)
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169 return m;
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170
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171 m = gfc_match_char (')');
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172 if (m == MATCH_NO)
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173 gfc_error ("Expected a right parenthesis in expression at %C");
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174
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175 /* Now we have the expression inside the parentheses, build the
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176 expression pointing to it. By 7.1.7.2, any expression in
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177 parentheses shall be treated as a data entity. */
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178 *result = gfc_get_parentheses (e);
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179
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180 if (m != MATCH_YES)
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181 {
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182 gfc_free_expr (*result);
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183 return MATCH_ERROR;
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184 }
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185
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186 return MATCH_YES;
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187
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188 syntax:
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189 gfc_error (expression_syntax);
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190 return MATCH_ERROR;
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191 }
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192
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193
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194 /* Match a level 1 expression. */
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195
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196 static match
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197 match_level_1 (gfc_expr **result)
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198 {
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199 gfc_user_op *uop;
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200 gfc_expr *e, *f;
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201 locus where;
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202 match m;
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203
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204 gfc_gobble_whitespace ();
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205 where = gfc_current_locus;
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206 uop = NULL;
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207 m = match_defined_operator (&uop);
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208 if (m == MATCH_ERROR)
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209 return m;
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210
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211 m = match_primary (&e);
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212 if (m != MATCH_YES)
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213 return m;
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214
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215 if (uop == NULL)
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216 *result = e;
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217 else
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218 {
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219 f = gfc_get_operator_expr (&where, INTRINSIC_USER, e, NULL);
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220 f->value.op.uop = uop;
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221 *result = f;
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222 }
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223
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224 return MATCH_YES;
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225 }
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226
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227
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228 /* As a GNU extension we support an expanded level-2 expression syntax.
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229 Via this extension we support (arbitrary) nesting of unary plus and
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230 minus operations following unary and binary operators, such as **.
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231 The grammar of section 7.1.1.3 is effectively rewritten as:
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232
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233 R704 mult-operand is level-1-expr [ power-op ext-mult-operand ]
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234 R704' ext-mult-operand is add-op ext-mult-operand
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235 or mult-operand
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236 R705 add-operand is add-operand mult-op ext-mult-operand
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237 or mult-operand
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238 R705' ext-add-operand is add-op ext-add-operand
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239 or add-operand
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240 R706 level-2-expr is [ level-2-expr ] add-op ext-add-operand
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241 or add-operand
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242 */
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243
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244 static match match_ext_mult_operand (gfc_expr **result);
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245 static match match_ext_add_operand (gfc_expr **result);
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246
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247 static int
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248 match_add_op (void)
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249 {
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250 if (next_operator (INTRINSIC_MINUS))
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251 return -1;
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252 if (next_operator (INTRINSIC_PLUS))
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253 return 1;
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254 return 0;
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255 }
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256
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257
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258 static match
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259 match_mult_operand (gfc_expr **result)
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260 {
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261 /* Workaround -Wmaybe-uninitialized false positive during
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262 profiledbootstrap by initializing them. */
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263 gfc_expr *e = NULL, *exp, *r;
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264 locus where;
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265 match m;
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266
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267 m = match_level_1 (&e);
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268 if (m != MATCH_YES)
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269 return m;
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270
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271 if (!next_operator (INTRINSIC_POWER))
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272 {
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273 *result = e;
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274 return MATCH_YES;
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275 }
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276
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277 where = gfc_current_locus;
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278
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279 m = match_ext_mult_operand (&exp);
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280 if (m == MATCH_NO)
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281 gfc_error ("Expected exponent in expression at %C");
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282 if (m != MATCH_YES)
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283 {
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284 gfc_free_expr (e);
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285 return MATCH_ERROR;
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286 }
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287
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288 r = gfc_power (e, exp);
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289 if (r == NULL)
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290 {
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291 gfc_free_expr (e);
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292 gfc_free_expr (exp);
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293 return MATCH_ERROR;
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294 }
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295
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296 r->where = where;
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297 *result = r;
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298
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299 return MATCH_YES;
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300 }
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301
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302
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303 static match
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304 match_ext_mult_operand (gfc_expr **result)
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305 {
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306 gfc_expr *all, *e;
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307 locus where;
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308 match m;
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309 int i;
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310
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311 where = gfc_current_locus;
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312 i = match_add_op ();
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313
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314 if (i == 0)
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315 return match_mult_operand (result);
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316
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317 if (gfc_notification_std (GFC_STD_GNU) == ERROR)
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318 {
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319 gfc_error ("Extension: Unary operator following "
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320 "arithmetic operator (use parentheses) at %C");
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321 return MATCH_ERROR;
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322 }
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323 else
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324 gfc_warning (0, "Extension: Unary operator following "
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325 "arithmetic operator (use parentheses) at %C");
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326
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327 m = match_ext_mult_operand (&e);
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328 if (m != MATCH_YES)
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329 return m;
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330
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331 if (i == -1)
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332 all = gfc_uminus (e);
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333 else
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334 all = gfc_uplus (e);
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335
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336 if (all == NULL)
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337 {
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338 gfc_free_expr (e);
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339 return MATCH_ERROR;
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340 }
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341
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342 all->where = where;
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343 *result = all;
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344 return MATCH_YES;
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345 }
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346
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347
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348 static match
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349 match_add_operand (gfc_expr **result)
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350 {
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351 gfc_expr *all, *e, *total;
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352 locus where, old_loc;
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353 match m;
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354 gfc_intrinsic_op i;
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355
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356 m = match_mult_operand (&all);
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357 if (m != MATCH_YES)
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358 return m;
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359
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360 for (;;)
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361 {
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362 /* Build up a string of products or quotients. */
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363
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364 old_loc = gfc_current_locus;
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365
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366 if (next_operator (INTRINSIC_TIMES))
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367 i = INTRINSIC_TIMES;
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368 else
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369 {
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370 if (next_operator (INTRINSIC_DIVIDE))
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371 i = INTRINSIC_DIVIDE;
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372 else
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373 break;
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374 }
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375
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376 where = gfc_current_locus;
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377
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378 m = match_ext_mult_operand (&e);
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379 if (m == MATCH_NO)
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380 {
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381 gfc_current_locus = old_loc;
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382 break;
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383 }
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384
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385 if (m == MATCH_ERROR)
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386 {
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387 gfc_free_expr (all);
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388 return MATCH_ERROR;
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389 }
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390
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391 if (i == INTRINSIC_TIMES)
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392 total = gfc_multiply (all, e);
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393 else
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394 total = gfc_divide (all, e);
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395
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396 if (total == NULL)
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397 {
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398 gfc_free_expr (all);
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399 gfc_free_expr (e);
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400 return MATCH_ERROR;
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401 }
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402
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403 all = total;
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404 all->where = where;
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405 }
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406
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407 *result = all;
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408 return MATCH_YES;
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409 }
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410
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411
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412 static match
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413 match_ext_add_operand (gfc_expr **result)
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414 {
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415 gfc_expr *all, *e;
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416 locus where;
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417 match m;
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418 int i;
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419
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420 where = gfc_current_locus;
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421 i = match_add_op ();
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422
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423 if (i == 0)
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424 return match_add_operand (result);
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425
|
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426 if (gfc_notification_std (GFC_STD_GNU) == ERROR)
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427 {
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428 gfc_error ("Extension: Unary operator following "
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429 "arithmetic operator (use parentheses) at %C");
|
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430 return MATCH_ERROR;
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431 }
|
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432 else
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433 gfc_warning (0, "Extension: Unary operator following "
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434 "arithmetic operator (use parentheses) at %C");
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435
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436 m = match_ext_add_operand (&e);
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437 if (m != MATCH_YES)
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438 return m;
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439
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440 if (i == -1)
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441 all = gfc_uminus (e);
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442 else
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443 all = gfc_uplus (e);
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444
|
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445 if (all == NULL)
|
|
446 {
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447 gfc_free_expr (e);
|
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448 return MATCH_ERROR;
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|
449 }
|
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450
|
|
451 all->where = where;
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452 *result = all;
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453 return MATCH_YES;
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454 }
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455
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456
|
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457 /* Match a level 2 expression. */
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458
|
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459 static match
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460 match_level_2 (gfc_expr **result)
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461 {
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462 gfc_expr *all, *e, *total;
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463 locus where;
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464 match m;
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465 int i;
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466
|
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467 where = gfc_current_locus;
|
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468 i = match_add_op ();
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469
|
|
470 if (i != 0)
|
|
471 {
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472 m = match_ext_add_operand (&e);
|
|
473 if (m == MATCH_NO)
|
|
474 {
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475 gfc_error (expression_syntax);
|
|
476 m = MATCH_ERROR;
|
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477 }
|
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478 }
|
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479 else
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480 m = match_add_operand (&e);
|
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481
|
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482 if (m != MATCH_YES)
|
|
483 return m;
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484
|
|
485 if (i == 0)
|
|
486 all = e;
|
|
487 else
|
|
488 {
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|
489 if (i == -1)
|
|
490 all = gfc_uminus (e);
|
|
491 else
|
|
492 all = gfc_uplus (e);
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|
493
|
|
494 if (all == NULL)
|
|
495 {
|
|
496 gfc_free_expr (e);
|
|
497 return MATCH_ERROR;
|
|
498 }
|
|
499 }
|
|
500
|
|
501 all->where = where;
|
|
502
|
|
503 /* Append add-operands to the sum. */
|
|
504
|
|
505 for (;;)
|
|
506 {
|
|
507 where = gfc_current_locus;
|
|
508 i = match_add_op ();
|
|
509 if (i == 0)
|
|
510 break;
|
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511
|
|
512 m = match_ext_add_operand (&e);
|
|
513 if (m == MATCH_NO)
|
|
514 gfc_error (expression_syntax);
|
|
515 if (m != MATCH_YES)
|
|
516 {
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|
517 gfc_free_expr (all);
|
|
518 return MATCH_ERROR;
|
|
519 }
|
|
520
|
|
521 if (i == -1)
|
|
522 total = gfc_subtract (all, e);
|
|
523 else
|
|
524 total = gfc_add (all, e);
|
|
525
|
|
526 if (total == NULL)
|
|
527 {
|
|
528 gfc_free_expr (all);
|
|
529 gfc_free_expr (e);
|
|
530 return MATCH_ERROR;
|
|
531 }
|
|
532
|
|
533 all = total;
|
|
534 all->where = where;
|
|
535 }
|
|
536
|
|
537 *result = all;
|
|
538 return MATCH_YES;
|
|
539 }
|
|
540
|
|
541
|
|
542 /* Match a level three expression. */
|
|
543
|
|
544 static match
|
|
545 match_level_3 (gfc_expr **result)
|
|
546 {
|
|
547 gfc_expr *all, *e, *total = NULL;
|
|
548 locus where;
|
|
549 match m;
|
|
550
|
|
551 m = match_level_2 (&all);
|
|
552 if (m != MATCH_YES)
|
|
553 return m;
|
|
554
|
|
555 for (;;)
|
|
556 {
|
|
557 if (!next_operator (INTRINSIC_CONCAT))
|
|
558 break;
|
|
559
|
|
560 where = gfc_current_locus;
|
|
561
|
|
562 m = match_level_2 (&e);
|
|
563 if (m == MATCH_NO)
|
|
564 gfc_error (expression_syntax);
|
|
565 if (m != MATCH_YES)
|
|
566 {
|
|
567 gfc_free_expr (all);
|
|
568 return MATCH_ERROR;
|
|
569 }
|
|
570
|
|
571 total = gfc_concat (all, e);
|
|
572 if (total == NULL)
|
|
573 {
|
|
574 gfc_free_expr (all);
|
|
575 gfc_free_expr (e);
|
|
576 return MATCH_ERROR;
|
|
577 }
|
|
578
|
|
579 all = total;
|
|
580 all->where = where;
|
|
581 }
|
|
582
|
|
583 *result = all;
|
|
584 return MATCH_YES;
|
|
585 }
|
|
586
|
|
587
|
|
588 /* Match a level 4 expression. */
|
|
589
|
|
590 static match
|
|
591 match_level_4 (gfc_expr **result)
|
|
592 {
|
|
593 gfc_expr *left, *right, *r;
|
|
594 gfc_intrinsic_op i;
|
|
595 locus old_loc;
|
|
596 locus where;
|
|
597 match m;
|
|
598
|
|
599 m = match_level_3 (&left);
|
|
600 if (m != MATCH_YES)
|
|
601 return m;
|
|
602
|
|
603 old_loc = gfc_current_locus;
|
|
604
|
|
605 if (gfc_match_intrinsic_op (&i) != MATCH_YES)
|
|
606 {
|
|
607 *result = left;
|
|
608 return MATCH_YES;
|
|
609 }
|
|
610
|
|
611 if (i != INTRINSIC_EQ && i != INTRINSIC_NE && i != INTRINSIC_GE
|
|
612 && i != INTRINSIC_LE && i != INTRINSIC_LT && i != INTRINSIC_GT
|
|
613 && i != INTRINSIC_EQ_OS && i != INTRINSIC_NE_OS && i != INTRINSIC_GE_OS
|
|
614 && i != INTRINSIC_LE_OS && i != INTRINSIC_LT_OS && i != INTRINSIC_GT_OS)
|
|
615 {
|
|
616 gfc_current_locus = old_loc;
|
|
617 *result = left;
|
|
618 return MATCH_YES;
|
|
619 }
|
|
620
|
|
621 where = gfc_current_locus;
|
|
622
|
|
623 m = match_level_3 (&right);
|
|
624 if (m == MATCH_NO)
|
|
625 gfc_error (expression_syntax);
|
|
626 if (m != MATCH_YES)
|
|
627 {
|
|
628 gfc_free_expr (left);
|
|
629 return MATCH_ERROR;
|
|
630 }
|
|
631
|
|
632 switch (i)
|
|
633 {
|
|
634 case INTRINSIC_EQ:
|
|
635 case INTRINSIC_EQ_OS:
|
|
636 r = gfc_eq (left, right, i);
|
|
637 break;
|
|
638
|
|
639 case INTRINSIC_NE:
|
|
640 case INTRINSIC_NE_OS:
|
|
641 r = gfc_ne (left, right, i);
|
|
642 break;
|
|
643
|
|
644 case INTRINSIC_LT:
|
|
645 case INTRINSIC_LT_OS:
|
|
646 r = gfc_lt (left, right, i);
|
|
647 break;
|
|
648
|
|
649 case INTRINSIC_LE:
|
|
650 case INTRINSIC_LE_OS:
|
|
651 r = gfc_le (left, right, i);
|
|
652 break;
|
|
653
|
|
654 case INTRINSIC_GT:
|
|
655 case INTRINSIC_GT_OS:
|
|
656 r = gfc_gt (left, right, i);
|
|
657 break;
|
|
658
|
|
659 case INTRINSIC_GE:
|
|
660 case INTRINSIC_GE_OS:
|
|
661 r = gfc_ge (left, right, i);
|
|
662 break;
|
|
663
|
|
664 default:
|
|
665 gfc_internal_error ("match_level_4(): Bad operator");
|
|
666 }
|
|
667
|
|
668 if (r == NULL)
|
|
669 {
|
|
670 gfc_free_expr (left);
|
|
671 gfc_free_expr (right);
|
|
672 return MATCH_ERROR;
|
|
673 }
|
|
674
|
|
675 r->where = where;
|
|
676 *result = r;
|
|
677
|
|
678 return MATCH_YES;
|
|
679 }
|
|
680
|
|
681
|
|
682 static match
|
|
683 match_and_operand (gfc_expr **result)
|
|
684 {
|
|
685 gfc_expr *e, *r;
|
|
686 locus where;
|
|
687 match m;
|
|
688 int i;
|
|
689
|
|
690 i = next_operator (INTRINSIC_NOT);
|
|
691 where = gfc_current_locus;
|
|
692
|
|
693 m = match_level_4 (&e);
|
|
694 if (m != MATCH_YES)
|
|
695 return m;
|
|
696
|
|
697 r = e;
|
|
698 if (i)
|
|
699 {
|
|
700 r = gfc_not (e);
|
|
701 if (r == NULL)
|
|
702 {
|
|
703 gfc_free_expr (e);
|
|
704 return MATCH_ERROR;
|
|
705 }
|
|
706 }
|
|
707
|
|
708 r->where = where;
|
|
709 *result = r;
|
|
710
|
|
711 return MATCH_YES;
|
|
712 }
|
|
713
|
|
714
|
|
715 static match
|
|
716 match_or_operand (gfc_expr **result)
|
|
717 {
|
|
718 gfc_expr *all, *e, *total;
|
|
719 locus where;
|
|
720 match m;
|
|
721
|
|
722 m = match_and_operand (&all);
|
|
723 if (m != MATCH_YES)
|
|
724 return m;
|
|
725
|
|
726 for (;;)
|
|
727 {
|
|
728 if (!next_operator (INTRINSIC_AND))
|
|
729 break;
|
|
730 where = gfc_current_locus;
|
|
731
|
|
732 m = match_and_operand (&e);
|
|
733 if (m == MATCH_NO)
|
|
734 gfc_error (expression_syntax);
|
|
735 if (m != MATCH_YES)
|
|
736 {
|
|
737 gfc_free_expr (all);
|
|
738 return MATCH_ERROR;
|
|
739 }
|
|
740
|
|
741 total = gfc_and (all, e);
|
|
742 if (total == NULL)
|
|
743 {
|
|
744 gfc_free_expr (all);
|
|
745 gfc_free_expr (e);
|
|
746 return MATCH_ERROR;
|
|
747 }
|
|
748
|
|
749 all = total;
|
|
750 all->where = where;
|
|
751 }
|
|
752
|
|
753 *result = all;
|
|
754 return MATCH_YES;
|
|
755 }
|
|
756
|
|
757
|
|
758 static match
|
|
759 match_equiv_operand (gfc_expr **result)
|
|
760 {
|
|
761 gfc_expr *all, *e, *total;
|
|
762 locus where;
|
|
763 match m;
|
|
764
|
|
765 m = match_or_operand (&all);
|
|
766 if (m != MATCH_YES)
|
|
767 return m;
|
|
768
|
|
769 for (;;)
|
|
770 {
|
|
771 if (!next_operator (INTRINSIC_OR))
|
|
772 break;
|
|
773 where = gfc_current_locus;
|
|
774
|
|
775 m = match_or_operand (&e);
|
|
776 if (m == MATCH_NO)
|
|
777 gfc_error (expression_syntax);
|
|
778 if (m != MATCH_YES)
|
|
779 {
|
|
780 gfc_free_expr (all);
|
|
781 return MATCH_ERROR;
|
|
782 }
|
|
783
|
|
784 total = gfc_or (all, e);
|
|
785 if (total == NULL)
|
|
786 {
|
|
787 gfc_free_expr (all);
|
|
788 gfc_free_expr (e);
|
|
789 return MATCH_ERROR;
|
|
790 }
|
|
791
|
|
792 all = total;
|
|
793 all->where = where;
|
|
794 }
|
|
795
|
|
796 *result = all;
|
|
797 return MATCH_YES;
|
|
798 }
|
|
799
|
|
800
|
|
801 /* Match a level 5 expression. */
|
|
802
|
|
803 static match
|
|
804 match_level_5 (gfc_expr **result)
|
|
805 {
|
|
806 gfc_expr *all, *e, *total;
|
|
807 locus where;
|
|
808 match m;
|
|
809 gfc_intrinsic_op i;
|
|
810
|
|
811 m = match_equiv_operand (&all);
|
|
812 if (m != MATCH_YES)
|
|
813 return m;
|
|
814
|
|
815 for (;;)
|
|
816 {
|
|
817 if (next_operator (INTRINSIC_EQV))
|
|
818 i = INTRINSIC_EQV;
|
|
819 else
|
|
820 {
|
|
821 if (next_operator (INTRINSIC_NEQV))
|
|
822 i = INTRINSIC_NEQV;
|
|
823 else
|
|
824 break;
|
|
825 }
|
|
826
|
|
827 where = gfc_current_locus;
|
|
828
|
|
829 m = match_equiv_operand (&e);
|
|
830 if (m == MATCH_NO)
|
|
831 gfc_error (expression_syntax);
|
|
832 if (m != MATCH_YES)
|
|
833 {
|
|
834 gfc_free_expr (all);
|
|
835 return MATCH_ERROR;
|
|
836 }
|
|
837
|
|
838 if (i == INTRINSIC_EQV)
|
|
839 total = gfc_eqv (all, e);
|
|
840 else
|
|
841 total = gfc_neqv (all, e);
|
|
842
|
|
843 if (total == NULL)
|
|
844 {
|
|
845 gfc_free_expr (all);
|
|
846 gfc_free_expr (e);
|
|
847 return MATCH_ERROR;
|
|
848 }
|
|
849
|
|
850 all = total;
|
|
851 all->where = where;
|
|
852 }
|
|
853
|
|
854 *result = all;
|
|
855 return MATCH_YES;
|
|
856 }
|
|
857
|
|
858
|
|
859 /* Match an expression. At this level, we are stringing together
|
|
860 level 5 expressions separated by binary operators. */
|
|
861
|
|
862 match
|
|
863 gfc_match_expr (gfc_expr **result)
|
|
864 {
|
|
865 gfc_expr *all, *e;
|
|
866 gfc_user_op *uop;
|
|
867 locus where;
|
|
868 match m;
|
|
869
|
|
870 m = match_level_5 (&all);
|
|
871 if (m != MATCH_YES)
|
|
872 return m;
|
|
873
|
|
874 for (;;)
|
|
875 {
|
|
876 uop = NULL;
|
|
877 m = match_defined_operator (&uop);
|
|
878 if (m == MATCH_NO)
|
|
879 break;
|
|
880 if (m == MATCH_ERROR)
|
|
881 {
|
|
882 gfc_free_expr (all);
|
|
883 return MATCH_ERROR;
|
|
884 }
|
|
885
|
|
886 where = gfc_current_locus;
|
|
887
|
|
888 m = match_level_5 (&e);
|
|
889 if (m == MATCH_NO)
|
|
890 gfc_error (expression_syntax);
|
|
891 if (m != MATCH_YES)
|
|
892 {
|
|
893 gfc_free_expr (all);
|
|
894 return MATCH_ERROR;
|
|
895 }
|
|
896
|
|
897 all = gfc_get_operator_expr (&where, INTRINSIC_USER, all, e);
|
|
898 all->value.op.uop = uop;
|
|
899 }
|
|
900
|
|
901 *result = all;
|
|
902 return MATCH_YES;
|
|
903 }
|