annotate gcc/ada/par-ch2.adb @ 131:84e7813d76e9

gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
111
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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- P A R . C H 2 --
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6 -- --
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7 -- B o d y --
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8 -- --
131
84e7813d76e9 gcc-8.2
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9 -- Copyright (C) 1992-2018, Free Software Foundation, Inc. --
111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 pragma Style_Checks (All_Checks);
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27 -- Turn off subprogram body ordering check. Subprograms are in order
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28 -- by RM section rather than alphabetical
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29
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30 separate (Par)
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31 package body Ch2 is
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32
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33 -- Local functions, used only in this chapter
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34
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35 procedure Scan_Pragma_Argument_Association
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36 (Identifier_Seen : in out Boolean;
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37 Association : out Node_Id;
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38 Reserved_Words_OK : Boolean := False);
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39 -- Scans out a pragma argument association. Identifier_Seen is True on
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40 -- entry if a previous association had an identifier, and gets set True
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41 -- if the scanned association has an identifier (this is used to check the
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42 -- rule that no associations without identifiers can follow an association
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43 -- which has an identifier). The result is returned in Association. Flag
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44 -- For_Pragma_Restrictions should be set when arguments are being parsed
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45 -- for pragma Restrictions.
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46 --
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47 -- Note: We allow attribute forms Pre'Class, Post'Class, Invariant'Class,
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48 -- Type_Invariant'Class in place of a pragma argument identifier. Rather
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49 -- than handle this case specially, we replace such references with
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50 -- one of the special internal identifiers _Pre, _Post, _Invariant, or
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51 -- _Type_Invariant, and this procedure is where this replacement occurs.
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52
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53 ---------------------
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54 -- 2.3 Identifier --
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55 ---------------------
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56
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57 -- IDENTIFIER ::= LETTER {[UNDERLINE] LETTER_OR_DIGIT}
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58
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59 -- LETTER_OR_DIGIT ::= IDENTIFIER_LETTER | DIGIT
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60
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61 -- An IDENTIFIER shall not be a reserved word
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62
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63 -- Error recovery: can raise Error_Resync (cannot return Error)
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64
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65 function P_Identifier (C : Id_Check := None) return Node_Id is
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66 Ident_Node : Node_Id;
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67
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68 begin
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69 -- All set if we do indeed have an identifier
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70
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71 -- Code duplication, see Par_Ch3.P_Defining_Identifier???
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72
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73 if Token = Tok_Identifier then
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74 Check_Future_Keyword;
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75 Ident_Node := Token_Node;
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76 Scan; -- past Identifier
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77 return Ident_Node;
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78
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79 -- If we have a reserved identifier, manufacture an identifier with
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80 -- a corresponding name after posting an appropriate error message
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81
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82 elsif Is_Reserved_Identifier (C) then
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83 Scan_Reserved_Identifier (Force_Msg => False);
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84 Ident_Node := Token_Node;
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85 Scan; -- past the node
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86 return Ident_Node;
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87
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88 -- Otherwise we have junk that cannot be interpreted as an identifier
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89
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90 else
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91 T_Identifier; -- to give message
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92 raise Error_Resync;
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93 end if;
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94 end P_Identifier;
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95
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96 --------------------------
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97 -- 2.3 Letter Or Digit --
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98 --------------------------
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99
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100 -- Parsed by P_Identifier (2.3)
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101
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102 --------------------------
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103 -- 2.4 Numeric Literal --
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104 --------------------------
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105
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106 -- NUMERIC_LITERAL ::= DECIMAL_LITERAL | BASED_LITERAL
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107
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108 -- Numeric literal is returned by the scanner as either
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109 -- Tok_Integer_Literal or Tok_Real_Literal
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110
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111 ----------------------------
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112 -- 2.4.1 Decimal Literal --
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113 ----------------------------
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114
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115 -- DECIMAL_LITERAL ::= NUMERAL [.NUMERAL] [EXPONENT]
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116
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117 -- Handled by scanner as part of numeric literal handing (see 2.4)
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118
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119 --------------------
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120 -- 2.4.1 Numeral --
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121 --------------------
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122
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123 -- NUMERAL ::= DIGIT {[UNDERLINE] DIGIT}
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124
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125 -- Handled by scanner as part of numeric literal handling (see 2.4)
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126
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127 ---------------------
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128 -- 2.4.1 Exponent --
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129 ---------------------
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130
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131 -- EXPONENT ::= E [+] NUMERAL | E - NUMERAL
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132
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133 -- Handled by scanner as part of numeric literal handling (see 2.4)
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134
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135 --------------------------
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136 -- 2.4.2 Based Literal --
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137 --------------------------
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138
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139 -- BASED_LITERAL ::=
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140 -- BASE # BASED_NUMERAL [.BASED_NUMERAL] # [EXPONENT]
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141
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142 -- Handled by scanner as part of numeric literal handling (see 2.4)
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143
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144 -----------------
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145 -- 2.4.2 Base --
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146 -----------------
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147
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148 -- BASE ::= NUMERAL
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149
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150 -- Handled by scanner as part of numeric literal handling (see 2.4)
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151
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152 --------------------------
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153 -- 2.4.2 Based Numeral --
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154 --------------------------
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155
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156 -- BASED_NUMERAL ::=
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157 -- EXTENDED_DIGIT {[UNDERLINE] EXTENDED_DIGIT}
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158
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159 -- Handled by scanner as part of numeric literal handling (see 2.4)
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160
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161 ---------------------------
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162 -- 2.4.2 Extended Digit --
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163 ---------------------------
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164
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165 -- EXTENDED_DIGIT ::= DIGIT | A | B | C | D | E | F
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166
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167 -- Handled by scanner as part of numeric literal handling (see 2.4)
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168
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169 ----------------------------
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170 -- 2.5 Character Literal --
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171 ----------------------------
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172
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173 -- CHARACTER_LITERAL ::= ' GRAPHIC_CHARACTER '
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174
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175 -- Handled by the scanner and returned as Tok_Char_Literal
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176
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177 -------------------------
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178 -- 2.6 String Literal --
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179 -------------------------
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180
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181 -- STRING LITERAL ::= "{STRING_ELEMENT}"
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182
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183 -- Handled by the scanner and returned as Tok_String_Literal
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184 -- or if the string looks like an operator as Tok_Operator_Symbol.
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185
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186 -------------------------
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187 -- 2.6 String Element --
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188 -------------------------
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189
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190 -- STRING_ELEMENT ::= "" | non-quotation_mark_GRAPHIC_CHARACTER
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191
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192 -- A STRING_ELEMENT is either a pair of quotation marks ("),
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193 -- or a single GRAPHIC_CHARACTER other than a quotation mark.
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194
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195 -- Handled by scanner as part of string literal handling (see 2.4)
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196
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197 ------------------
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198 -- 2.7 Comment --
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199 ------------------
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200
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201 -- A COMMENT starts with two adjacent hyphens and extends up to the
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202 -- end of the line. A COMMENT may appear on any line of a program.
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203
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204 -- Handled by the scanner which simply skips past encountered comments
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205
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206 -----------------
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207 -- 2.8 Pragma --
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208 -----------------
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209
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210 -- PRAGMA ::= pragma IDENTIFIER
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211 -- [(PRAGMA_ARGUMENT_ASSOCIATION {, PRAGMA_ARGUMENT_ASSOCIATION})];
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212
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213 -- The caller has checked that the initial token is PRAGMA
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214
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215 -- Error recovery: cannot raise Error_Resync
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216
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217 -- One special piece of processing is needed in this routine. As described
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218 -- in the section on "Handling semicolon used in place of IS" in module
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219 -- Parse, the parser detects the case of missing subprogram bodies to
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220 -- allow recovery from this syntactic error. Pragma INTERFACE (and, for
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221 -- Ada 95, pragma IMPORT) can appear in place of the body. The parser must
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222 -- recognize the use of these two pragmas in this context, otherwise it
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223 -- will think there are missing bodies, and try to change ; to IS, when
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224 -- in fact the bodies ARE present, supplied by these pragmas.
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225
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226 function P_Pragma (Skipping : Boolean := False) return Node_Id is
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227 procedure Skip_Pragma_Semicolon;
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228 -- Skip past semicolon at end of pragma
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229
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230 ---------------------------
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231 -- Skip_Pragma_Semicolon --
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232 ---------------------------
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233
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234 procedure Skip_Pragma_Semicolon is
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235 begin
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236 -- If skipping the pragma, ignore a missing semicolon
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237
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238 if Token /= Tok_Semicolon and then Skipping then
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239 null;
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240
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241 -- Otherwise demand a semicolon
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242
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243 else
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244 T_Semicolon;
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245 end if;
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246 end Skip_Pragma_Semicolon;
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247
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248 -- Local variables
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249
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250 Interface_Check_Required : Boolean := False;
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251 -- Set True if check of pragma INTERFACE is required
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252
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253 Import_Check_Required : Boolean := False;
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254 -- Set True if check of pragma IMPORT is required
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255
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256 Arg_Count : Nat := 0;
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257 -- Number of argument associations processed
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258
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259 Identifier_Seen : Boolean := False;
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260 -- Set True if an identifier is encountered for a pragma argument. Used
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261 -- to check that there are no more arguments without identifiers.
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262
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263 Assoc_Node : Node_Id;
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264 Ident_Node : Node_Id;
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265 Prag_Name : Name_Id;
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266 Prag_Node : Node_Id;
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267 Result : Node_Id;
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268 Semicolon_Loc : Source_Ptr;
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269
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270 -- Start of processing for P_Pragma
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271
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272 begin
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273 Inside_Pragma := True;
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274 Prag_Node := New_Node (N_Pragma, Token_Ptr);
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275 Scan; -- past PRAGMA
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276 Prag_Name := Token_Name;
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277
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278 if Style_Check then
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279 Style.Check_Pragma_Name;
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280 end if;
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281
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282 -- Ada 2005 (AI-284): INTERFACE is a new reserved word but it is
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283 -- allowed as a pragma name.
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284
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285 if Is_Reserved_Keyword (Token) then
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286 Prag_Name := Keyword_Name (Token);
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287 Ident_Node := Make_Identifier (Token_Ptr, Prag_Name);
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288 Scan; -- past the keyword
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289 else
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290 Ident_Node := P_Identifier;
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291 end if;
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292
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293 Set_Pragma_Identifier (Prag_Node, Ident_Node);
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294
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295 -- See if special INTERFACE/IMPORT check is required
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296
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297 if SIS_Entry_Active then
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298 Interface_Check_Required := (Prag_Name = Name_Interface);
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299 Import_Check_Required := (Prag_Name = Name_Import);
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300 else
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301 Interface_Check_Required := False;
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302 Import_Check_Required := False;
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303 end if;
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304
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305 -- Set global to indicate if we are within a Depends pragma
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306
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307 if Chars (Ident_Node) = Name_Depends
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308 or else Chars (Ident_Node) = Name_Refined_Depends
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309 then
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310 Inside_Depends := True;
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311 end if;
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312
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313 -- Scan arguments. We assume that arguments are present if there is
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314 -- a left paren, or if a semicolon is missing and there is another
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315 -- token on the same line as the pragma name.
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316
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317 if Token = Tok_Left_Paren
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318 or else (Token /= Tok_Semicolon
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319 and then not Token_Is_At_Start_Of_Line)
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320 then
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321 Set_Pragma_Argument_Associations (Prag_Node, New_List);
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322 T_Left_Paren;
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323
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324 loop
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325 Arg_Count := Arg_Count + 1;
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326
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327 Scan_Pragma_Argument_Association
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328 (Identifier_Seen => Identifier_Seen,
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329 Association => Assoc_Node,
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330 Reserved_Words_OK =>
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331 Nam_In (Prag_Name, Name_Restriction_Warnings,
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332 Name_Restrictions));
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333
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334 if Arg_Count = 2
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335 and then (Interface_Check_Required or else Import_Check_Required)
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336 then
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337 -- Here is where we cancel the SIS active status if this pragma
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338 -- supplies a body for the currently active subprogram spec.
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339
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340 if Nkind (Expression (Assoc_Node)) in N_Direct_Name
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341 and then Chars (Expression (Assoc_Node)) = Chars (SIS_Labl)
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342 then
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343 SIS_Entry_Active := False;
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344 end if;
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345 end if;
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346
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parents:
diff changeset
347 Append (Assoc_Node, Pragma_Argument_Associations (Prag_Node));
kono
parents:
diff changeset
348 exit when Token /= Tok_Comma;
kono
parents:
diff changeset
349 Scan; -- past comma
kono
parents:
diff changeset
350 end loop;
kono
parents:
diff changeset
351
kono
parents:
diff changeset
352 -- If we have := for pragma Debug, it is worth special casing the
kono
parents:
diff changeset
353 -- error message (it is easy to think of pragma Debug as taking a
kono
parents:
diff changeset
354 -- statement, and an assignment statement is the most likely
kono
parents:
diff changeset
355 -- candidate for this error)
kono
parents:
diff changeset
356
kono
parents:
diff changeset
357 if Token = Tok_Colon_Equal and then Prag_Name = Name_Debug then
kono
parents:
diff changeset
358 Error_Msg_SC ("argument for pragma Debug must be procedure call");
kono
parents:
diff changeset
359 Resync_To_Semicolon;
kono
parents:
diff changeset
360
kono
parents:
diff changeset
361 -- Normal case, we expect a right paren here
kono
parents:
diff changeset
362
kono
parents:
diff changeset
363 else
kono
parents:
diff changeset
364 T_Right_Paren;
kono
parents:
diff changeset
365 end if;
kono
parents:
diff changeset
366 end if;
kono
parents:
diff changeset
367
kono
parents:
diff changeset
368 Semicolon_Loc := Token_Ptr;
kono
parents:
diff changeset
369
kono
parents:
diff changeset
370 -- Cancel indication of being within a pragma or in particular a Depends
kono
parents:
diff changeset
371 -- pragma.
kono
parents:
diff changeset
372
kono
parents:
diff changeset
373 Inside_Depends := False;
kono
parents:
diff changeset
374 Inside_Pragma := False;
kono
parents:
diff changeset
375
kono
parents:
diff changeset
376 -- Now we have two tasks left, we need to scan out the semicolon
kono
parents:
diff changeset
377 -- following the pragma, and we have to call Par.Prag to process
kono
parents:
diff changeset
378 -- the pragma. Normally we do them in this order, however, there
kono
parents:
diff changeset
379 -- is one exception namely pragma Style_Checks where we like to
kono
parents:
diff changeset
380 -- skip the semicolon after processing the pragma, since that way
kono
parents:
diff changeset
381 -- the style checks for the scanning of the semicolon follow the
kono
parents:
diff changeset
382 -- settings of the pragma.
kono
parents:
diff changeset
383
kono
parents:
diff changeset
384 -- You might think we could just unconditionally do things in
kono
parents:
diff changeset
385 -- the opposite order, but there are other pragmas, notably the
kono
parents:
diff changeset
386 -- case of pragma Source_File_Name, which assume the semicolon
kono
parents:
diff changeset
387 -- is already scanned out.
kono
parents:
diff changeset
388
kono
parents:
diff changeset
389 if Prag_Name = Name_Style_Checks then
kono
parents:
diff changeset
390 Result := Par.Prag (Prag_Node, Semicolon_Loc);
kono
parents:
diff changeset
391 Skip_Pragma_Semicolon;
kono
parents:
diff changeset
392 return Result;
kono
parents:
diff changeset
393 else
kono
parents:
diff changeset
394 Skip_Pragma_Semicolon;
kono
parents:
diff changeset
395 return Par.Prag (Prag_Node, Semicolon_Loc);
kono
parents:
diff changeset
396 end if;
kono
parents:
diff changeset
397
kono
parents:
diff changeset
398 exception
kono
parents:
diff changeset
399 when Error_Resync =>
kono
parents:
diff changeset
400 Resync_Past_Semicolon;
kono
parents:
diff changeset
401 Inside_Depends := False;
kono
parents:
diff changeset
402 Inside_Pragma := False;
kono
parents:
diff changeset
403 return Error;
kono
parents:
diff changeset
404 end P_Pragma;
kono
parents:
diff changeset
405
kono
parents:
diff changeset
406 -- This routine is called if a pragma is encountered in an inappropriate
kono
parents:
diff changeset
407 -- position, the pragma is scanned out and control returns to continue.
kono
parents:
diff changeset
408
kono
parents:
diff changeset
409 -- The caller has checked that the initial token is pragma
kono
parents:
diff changeset
410
kono
parents:
diff changeset
411 -- Error recovery: cannot raise Error_Resync
kono
parents:
diff changeset
412
kono
parents:
diff changeset
413 procedure P_Pragmas_Misplaced is
kono
parents:
diff changeset
414 begin
kono
parents:
diff changeset
415 while Token = Tok_Pragma loop
kono
parents:
diff changeset
416 Error_Msg_SC ("pragma not allowed here");
kono
parents:
diff changeset
417 Discard_Junk_Node (P_Pragma (Skipping => True));
kono
parents:
diff changeset
418 end loop;
kono
parents:
diff changeset
419 end P_Pragmas_Misplaced;
kono
parents:
diff changeset
420
kono
parents:
diff changeset
421 -- This function is called to scan out an optional sequence of pragmas.
kono
parents:
diff changeset
422 -- If no pragmas are found, then No_List is returned.
kono
parents:
diff changeset
423
kono
parents:
diff changeset
424 -- Error recovery: Cannot raise Error_Resync
kono
parents:
diff changeset
425
kono
parents:
diff changeset
426 function P_Pragmas_Opt return List_Id is
kono
parents:
diff changeset
427 L : List_Id;
kono
parents:
diff changeset
428
kono
parents:
diff changeset
429 begin
kono
parents:
diff changeset
430 if Token = Tok_Pragma then
kono
parents:
diff changeset
431 L := New_List;
kono
parents:
diff changeset
432 P_Pragmas_Opt (L);
kono
parents:
diff changeset
433 return L;
kono
parents:
diff changeset
434
kono
parents:
diff changeset
435 else
kono
parents:
diff changeset
436 return No_List;
kono
parents:
diff changeset
437 end if;
kono
parents:
diff changeset
438 end P_Pragmas_Opt;
kono
parents:
diff changeset
439
kono
parents:
diff changeset
440 -- This procedure is called to scan out an optional sequence of pragmas.
kono
parents:
diff changeset
441 -- Any pragmas found are appended to the list provided as an argument.
kono
parents:
diff changeset
442
kono
parents:
diff changeset
443 -- Error recovery: Cannot raise Error_Resync
kono
parents:
diff changeset
444
kono
parents:
diff changeset
445 procedure P_Pragmas_Opt (List : List_Id) is
kono
parents:
diff changeset
446 P : Node_Id;
kono
parents:
diff changeset
447
kono
parents:
diff changeset
448 begin
kono
parents:
diff changeset
449 while Token = Tok_Pragma loop
kono
parents:
diff changeset
450 P := P_Pragma;
kono
parents:
diff changeset
451
kono
parents:
diff changeset
452 if Nkind (P) /= N_Error
kono
parents:
diff changeset
453 and then Nam_In (Pragma_Name_Unmapped (P), Name_Assert, Name_Debug)
kono
parents:
diff changeset
454 then
kono
parents:
diff changeset
455 Error_Msg_Name_1 := Pragma_Name_Unmapped (P);
kono
parents:
diff changeset
456 Error_Msg_N
kono
parents:
diff changeset
457 ("pragma% must be in declaration/statement context", P);
kono
parents:
diff changeset
458 else
kono
parents:
diff changeset
459 Append (P, List);
kono
parents:
diff changeset
460 end if;
kono
parents:
diff changeset
461 end loop;
kono
parents:
diff changeset
462 end P_Pragmas_Opt;
kono
parents:
diff changeset
463
kono
parents:
diff changeset
464 --------------------------------------
kono
parents:
diff changeset
465 -- 2.8 Pragma_Argument Association --
kono
parents:
diff changeset
466 --------------------------------------
kono
parents:
diff changeset
467
kono
parents:
diff changeset
468 -- PRAGMA_ARGUMENT_ASSOCIATION ::=
kono
parents:
diff changeset
469 -- [pragma_argument_IDENTIFIER =>] NAME
kono
parents:
diff changeset
470 -- | [pragma_argument_IDENTIFIER =>] EXPRESSION
kono
parents:
diff changeset
471
kono
parents:
diff changeset
472 -- In Ada 2012, there are two more possibilities:
kono
parents:
diff changeset
473
kono
parents:
diff changeset
474 -- PRAGMA_ARGUMENT_ASSOCIATION ::=
kono
parents:
diff changeset
475 -- [pragma_argument_ASPECT_MARK =>] NAME
kono
parents:
diff changeset
476 -- | [pragma_argument_ASPECT_MARK =>] EXPRESSION
kono
parents:
diff changeset
477
kono
parents:
diff changeset
478 -- where the interesting allowed cases (which do not fit the syntax of the
kono
parents:
diff changeset
479 -- first alternative above) are
kono
parents:
diff changeset
480
kono
parents:
diff changeset
481 -- ASPECT_MARK ::=
kono
parents:
diff changeset
482 -- Pre'Class | Post'Class | Invariant'Class | Type_Invariant'Class
kono
parents:
diff changeset
483
kono
parents:
diff changeset
484 -- We allow this special usage in all Ada modes, but it would be a pain to
kono
parents:
diff changeset
485 -- allow these aspects to pervade the pragma syntax, and the representation
kono
parents:
diff changeset
486 -- of pragma nodes internally. So what we do is to replace these
kono
parents:
diff changeset
487 -- ASPECT_MARK forms with identifiers whose name is one of the special
kono
parents:
diff changeset
488 -- internal names _Pre, _Post, _Invariant, or _Type_Invariant.
kono
parents:
diff changeset
489
kono
parents:
diff changeset
490 -- Error recovery: cannot raise Error_Resync
kono
parents:
diff changeset
491
kono
parents:
diff changeset
492 procedure Scan_Pragma_Argument_Association
kono
parents:
diff changeset
493 (Identifier_Seen : in out Boolean;
kono
parents:
diff changeset
494 Association : out Node_Id;
kono
parents:
diff changeset
495 Reserved_Words_OK : Boolean := False)
kono
parents:
diff changeset
496 is
kono
parents:
diff changeset
497 function P_Expression_Or_Reserved_Word return Node_Id;
kono
parents:
diff changeset
498 -- Parse an expression or, if the token is one of the following reserved
kono
parents:
diff changeset
499 -- words, construct an identifier with proper Chars field.
kono
parents:
diff changeset
500 -- Access
kono
parents:
diff changeset
501 -- Delta
kono
parents:
diff changeset
502 -- Digits
kono
parents:
diff changeset
503 -- Mod
kono
parents:
diff changeset
504 -- Range
kono
parents:
diff changeset
505
kono
parents:
diff changeset
506 -----------------------------------
kono
parents:
diff changeset
507 -- P_Expression_Or_Reserved_Word --
kono
parents:
diff changeset
508 -----------------------------------
kono
parents:
diff changeset
509
kono
parents:
diff changeset
510 function P_Expression_Or_Reserved_Word return Node_Id is
kono
parents:
diff changeset
511 Word : Node_Id;
kono
parents:
diff changeset
512 Word_Id : Name_Id;
kono
parents:
diff changeset
513
kono
parents:
diff changeset
514 begin
kono
parents:
diff changeset
515 Word_Id := No_Name;
kono
parents:
diff changeset
516
kono
parents:
diff changeset
517 if Token = Tok_Access then
kono
parents:
diff changeset
518 Word_Id := Name_Access;
kono
parents:
diff changeset
519 Scan; -- past ACCESS
kono
parents:
diff changeset
520
kono
parents:
diff changeset
521 elsif Token = Tok_Delta then
kono
parents:
diff changeset
522 Word_Id := Name_Delta;
kono
parents:
diff changeset
523 Scan; -- past DELTA
kono
parents:
diff changeset
524
kono
parents:
diff changeset
525 elsif Token = Tok_Digits then
kono
parents:
diff changeset
526 Word_Id := Name_Digits;
kono
parents:
diff changeset
527 Scan; -- past DIGITS
kono
parents:
diff changeset
528
kono
parents:
diff changeset
529 elsif Token = Tok_Mod then
kono
parents:
diff changeset
530 Word_Id := Name_Mod;
kono
parents:
diff changeset
531 Scan; -- past MOD
kono
parents:
diff changeset
532
kono
parents:
diff changeset
533 elsif Token = Tok_Range then
kono
parents:
diff changeset
534 Word_Id := Name_Range;
kono
parents:
diff changeset
535 Scan; -- post RANGE
kono
parents:
diff changeset
536 end if;
kono
parents:
diff changeset
537
kono
parents:
diff changeset
538 if Word_Id = No_Name then
kono
parents:
diff changeset
539 return P_Expression;
kono
parents:
diff changeset
540 else
kono
parents:
diff changeset
541 Word := New_Node (N_Identifier, Token_Ptr);
kono
parents:
diff changeset
542 Set_Chars (Word, Word_Id);
kono
parents:
diff changeset
543 return Word;
kono
parents:
diff changeset
544 end if;
kono
parents:
diff changeset
545 end P_Expression_Or_Reserved_Word;
kono
parents:
diff changeset
546
kono
parents:
diff changeset
547 -- Local variables
kono
parents:
diff changeset
548
kono
parents:
diff changeset
549 Expression_Node : Node_Id;
kono
parents:
diff changeset
550 Identifier_Node : Node_Id;
kono
parents:
diff changeset
551 Identifier_OK : Boolean;
kono
parents:
diff changeset
552 Scan_State : Saved_Scan_State;
kono
parents:
diff changeset
553
kono
parents:
diff changeset
554 -- Start of processing for Scan_Pragma_Argument_Association
kono
parents:
diff changeset
555
kono
parents:
diff changeset
556 begin
kono
parents:
diff changeset
557 Association := New_Node (N_Pragma_Argument_Association, Token_Ptr);
kono
parents:
diff changeset
558 Set_Chars (Association, No_Name);
kono
parents:
diff changeset
559 Identifier_OK := False;
kono
parents:
diff changeset
560
kono
parents:
diff changeset
561 -- Argument starts with identifier
kono
parents:
diff changeset
562
kono
parents:
diff changeset
563 if Token = Tok_Identifier then
kono
parents:
diff changeset
564 Identifier_Node := Token_Node;
kono
parents:
diff changeset
565 Save_Scan_State (Scan_State); -- at Identifier
kono
parents:
diff changeset
566 Scan; -- past Identifier
kono
parents:
diff changeset
567
kono
parents:
diff changeset
568 if Token = Tok_Arrow then
kono
parents:
diff changeset
569 Scan; -- past arrow
kono
parents:
diff changeset
570 Identifier_OK := True;
kono
parents:
diff changeset
571
kono
parents:
diff changeset
572 -- Case of one of the special aspect forms
kono
parents:
diff changeset
573
kono
parents:
diff changeset
574 elsif Token = Tok_Apostrophe then
kono
parents:
diff changeset
575 Scan; -- past apostrophe
kono
parents:
diff changeset
576
kono
parents:
diff changeset
577 -- We have apostrophe, so check for identifier'Class
kono
parents:
diff changeset
578
kono
parents:
diff changeset
579 if Token /= Tok_Identifier or else Token_Name /= Name_Class then
kono
parents:
diff changeset
580 null;
kono
parents:
diff changeset
581
kono
parents:
diff changeset
582 -- We have identifier'Class, check for arrow
kono
parents:
diff changeset
583
kono
parents:
diff changeset
584 else
kono
parents:
diff changeset
585 Scan; -- Past Class
kono
parents:
diff changeset
586
kono
parents:
diff changeset
587 if Token /= Tok_Arrow then
kono
parents:
diff changeset
588 null;
kono
parents:
diff changeset
589
kono
parents:
diff changeset
590 -- Here we have scanned identifier'Class =>
kono
parents:
diff changeset
591
kono
parents:
diff changeset
592 else
kono
parents:
diff changeset
593 Identifier_OK := True;
kono
parents:
diff changeset
594 Scan; -- past arrow
kono
parents:
diff changeset
595
kono
parents:
diff changeset
596 case Chars (Identifier_Node) is
kono
parents:
diff changeset
597 when Name_Pre =>
kono
parents:
diff changeset
598 Set_Chars (Identifier_Node, Name_uPre);
kono
parents:
diff changeset
599
kono
parents:
diff changeset
600 when Name_Post =>
kono
parents:
diff changeset
601 Set_Chars (Identifier_Node, Name_uPost);
kono
parents:
diff changeset
602
kono
parents:
diff changeset
603 when Name_Type_Invariant =>
kono
parents:
diff changeset
604 Set_Chars (Identifier_Node, Name_uType_Invariant);
kono
parents:
diff changeset
605
kono
parents:
diff changeset
606 when Name_Invariant =>
kono
parents:
diff changeset
607 Set_Chars (Identifier_Node, Name_uInvariant);
kono
parents:
diff changeset
608
kono
parents:
diff changeset
609 -- If it is X'Class => for some invalid X, we will give
kono
parents:
diff changeset
610 -- an error, and forget that 'Class was present, which
kono
parents:
diff changeset
611 -- will give better error recovery. We could do a spell
kono
parents:
diff changeset
612 -- check here, but it seems too much work.
kono
parents:
diff changeset
613
kono
parents:
diff changeset
614 when others =>
kono
parents:
diff changeset
615 Error_Msg_SC ("invalid aspect id for pragma");
kono
parents:
diff changeset
616 end case;
kono
parents:
diff changeset
617 end if;
kono
parents:
diff changeset
618 end if;
kono
parents:
diff changeset
619 end if;
kono
parents:
diff changeset
620
kono
parents:
diff changeset
621 -- Identifier was present
kono
parents:
diff changeset
622
kono
parents:
diff changeset
623 if Identifier_OK then
kono
parents:
diff changeset
624 Set_Chars (Association, Chars (Identifier_Node));
kono
parents:
diff changeset
625 Identifier_Seen := True;
kono
parents:
diff changeset
626
kono
parents:
diff changeset
627 -- Identifier not present after all
kono
parents:
diff changeset
628
kono
parents:
diff changeset
629 else
kono
parents:
diff changeset
630 Restore_Scan_State (Scan_State); -- to Identifier
kono
parents:
diff changeset
631 end if;
kono
parents:
diff changeset
632 end if;
kono
parents:
diff changeset
633
kono
parents:
diff changeset
634 -- Diagnose error of "positional" argument for pragma appearing after
kono
parents:
diff changeset
635 -- a "named" argument (quotes here are because that's not quite accurate
kono
parents:
diff changeset
636 -- Ada RM terminology).
kono
parents:
diff changeset
637
kono
parents:
diff changeset
638 -- Since older GNAT versions did not generate this error, disable this
kono
parents:
diff changeset
639 -- message in Relaxed_RM_Semantics mode to help legacy code using e.g.
kono
parents:
diff changeset
640 -- codepeer.
kono
parents:
diff changeset
641
kono
parents:
diff changeset
642 if Identifier_Seen
kono
parents:
diff changeset
643 and not Identifier_OK
kono
parents:
diff changeset
644 and not Relaxed_RM_Semantics
kono
parents:
diff changeset
645 then
kono
parents:
diff changeset
646 Error_Msg_SC ("|pragma argument identifier required here");
kono
parents:
diff changeset
647 Error_Msg_SC ("\since previous argument had identifier (RM 2.8(4))");
kono
parents:
diff changeset
648 end if;
kono
parents:
diff changeset
649
kono
parents:
diff changeset
650 if Identifier_OK then
kono
parents:
diff changeset
651
kono
parents:
diff changeset
652 -- Certain pragmas such as Restriction_Warnings and Restrictions
kono
parents:
diff changeset
653 -- allow reserved words to appear as expressions when checking for
kono
parents:
diff changeset
654 -- prohibited uses of attributes.
kono
parents:
diff changeset
655
kono
parents:
diff changeset
656 if Reserved_Words_OK
kono
parents:
diff changeset
657 and then Chars (Identifier_Node) = Name_No_Use_Of_Attribute
kono
parents:
diff changeset
658 then
kono
parents:
diff changeset
659 Expression_Node := P_Expression_Or_Reserved_Word;
kono
parents:
diff changeset
660 else
kono
parents:
diff changeset
661 Expression_Node := P_Expression;
kono
parents:
diff changeset
662 end if;
kono
parents:
diff changeset
663 else
kono
parents:
diff changeset
664 Expression_Node := P_Expression_If_OK;
kono
parents:
diff changeset
665 end if;
kono
parents:
diff changeset
666
kono
parents:
diff changeset
667 Set_Expression (Association, Expression_Node);
kono
parents:
diff changeset
668 end Scan_Pragma_Argument_Association;
kono
parents:
diff changeset
669
kono
parents:
diff changeset
670 end Ch2;