1 | /* |
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2 | * Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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3 | * |
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4 | * The contents of this file are covered under the licence agreement in the |
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5 | * file "LICENCE" distributed with Cforall. |
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6 | * |
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7 | * lex.ll -- |
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8 | * |
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9 | * Author : Peter A. Buhr |
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10 | * Created On : Sat Sep 22 08:58:10 2001 |
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11 | * Last Modified By : Peter A. Buhr |
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12 | * Last Modified On : Sat Feb 24 11:47:24 2024 |
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13 | * Update Count : 777 |
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14 | */ |
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15 | |
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16 | %option yylineno |
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17 | %option noyywrap |
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18 | %option nounput |
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19 | |
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20 | %{ |
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21 | // The lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been |
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22 | // performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g., |
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23 | // line-number directives) and C/C++ style comments, which are ignored. |
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24 | |
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25 | // *************************** Includes and Defines **************************** |
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26 | |
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27 | #ifdef __clang__ |
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28 | #pragma GCC diagnostic ignored "-Wnull-conversion" |
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29 | #endif |
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30 | |
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31 | // trigger before each matching rule's action |
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32 | #define YY_USER_ACTION \ |
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33 | yylloc.first_line = yylineno; \ |
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34 | yylloc.first_column = column; \ |
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35 | column += yyleng; \ |
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36 | yylloc.last_column = column; \ |
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37 | yylloc.last_line = yylineno; \ |
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38 | yylloc.filename = yyfilename ? yyfilename : ""; |
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39 | unsigned int column = 0; // position of the end of the last token parsed |
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40 | |
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41 | #include <string> |
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42 | #include <cstdio> // FILENAME_MAX |
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43 | using namespace std; |
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44 | |
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45 | #include "config.h" // configure info |
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46 | #include "DeclarationNode.h" // for DeclarationNode |
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47 | #include "ExpressionNode.h" // for LabelNode |
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48 | #include "InitializerNode.h" // for InitializerNode |
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49 | #include "ParseNode.h" |
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50 | #include "ParserTypes.h" // for Token |
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51 | #include "StatementNode.h" // for CondCtl, ForCtrl |
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52 | #include "TypedefTable.h" |
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53 | // This (generated) header must come late as it is missing includes. |
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54 | #include "parser.hh" // generated info |
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55 | |
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56 | string * build_postfix_name( string * name ); |
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57 | |
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58 | char *yyfilename; |
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59 | string *strtext; // accumulate parts of character and string constant value |
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60 | |
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61 | #define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x ) |
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62 | #define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x ) |
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63 | #define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x ) |
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64 | #define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x ) |
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65 | |
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66 | #define WHITE_RETURN(x) // do nothing |
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67 | #define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' ) |
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68 | #define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator |
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69 | #define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name |
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70 | #define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant |
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71 | #define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword |
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72 | #define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword |
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73 | #define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) ) |
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74 | |
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75 | #ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef |
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76 | #define FLOATXX(v) KEYWORD_RETURN(v); |
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77 | #else |
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78 | #define FLOATXX(v) IDENTIFIER_RETURN(); |
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79 | #endif // HAVE_KEYWORDS_FLOATXX |
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80 | |
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81 | void rm_underscore() { |
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82 | // SKULLDUGGERY: remove underscores (ok to shorten?) |
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83 | yyleng = 0; |
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84 | for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string |
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85 | if ( yytext[i] != '_' ) { |
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86 | yytext[yyleng] = yytext[i]; |
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87 | yyleng += 1; |
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88 | } // if |
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89 | } // for |
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90 | yytext[yyleng] = '\0'; |
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91 | } // rm_underscore |
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92 | |
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93 | // Stop warning due to incorrectly generated flex code. |
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94 | #pragma GCC diagnostic ignored "-Wsign-compare" |
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95 | %} |
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96 | |
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97 | binary [0-1] |
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98 | octal [0-7] |
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99 | nonzero [1-9] |
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100 | decimal [0-9] |
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101 | hex [0-9a-fA-F] |
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102 | universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2})) |
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103 | |
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104 | // identifier, GCC: $ in identifier |
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105 | identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})* |
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106 | |
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107 | // numeric constants, CFA: '_' in constant |
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108 | hex_quad {hex}("_"?{hex}){3} |
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109 | size_opt (8|16|32|64|128)? |
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110 | // CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n' |
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111 | length ("ll"|"LL"|[lL]{size_opt})|("hh"|"HH"|[hHnN]) |
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112 | // CFA: size_t 'z', pointer 'p', which define a sign and length |
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113 | integer_suffix_opt ("_"?(([uU]({length}?[iI]?)|([iI]{length}))|([iI]({length}?[uU]?)|([uU]{length}))|({length}([iI]?[uU]?)|([uU][iI]))|[zZ]|[pP]))? |
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114 | |
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115 | octal_digits ({octal})|({octal}({octal}|"_")*{octal}) |
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116 | octal_prefix "0""_"? |
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117 | octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix_opt} |
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118 | |
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119 | nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal}) |
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120 | decimal_constant {nonzero_digits}{integer_suffix_opt} |
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121 | |
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122 | binary_digits ({binary})|({binary}({binary}|"_")*{binary}) |
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123 | binary_prefix "0"[bB]"_"? |
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124 | binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt} |
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125 | |
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126 | hex_digits ({hex})|({hex}({hex}|"_")*{hex}) |
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127 | hex_prefix "0"[xX]"_"? |
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128 | hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt} |
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129 | |
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130 | // GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL |
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131 | exponent "_"?[eE]"_"?[+-]?{decimal_digits} |
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132 | floating_size 16|32|32x|64|64x|80|128|128x |
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133 | floating_length ([fFdDlLwWqQ]|[fF]{floating_size}) |
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134 | floating_suffix ({floating_length}?[iI]?)|([iI]{floating_length}) |
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135 | decimal_floating_suffix [dD][fFdDlL] |
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136 | floating_suffix_opt ("_"?({floating_suffix}|{decimal_floating_suffix}))? |
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137 | decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal}) |
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138 | floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt} |
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139 | floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt} |
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140 | floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})|({decimal_digits}{floating_fraction}) |
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141 | |
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142 | binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits} |
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143 | hex_floating_suffix_opt ("_"?({floating_suffix}))? |
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144 | hex_floating_fraction ({hex_digits}?"."{hex_digits})|({hex_digits}".") |
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145 | hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})|({hex_digits}{binary_exponent})){hex_floating_suffix_opt} |
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146 | |
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147 | // character escape sequence, GCC: \e => esc character |
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148 | simple_escape "\\"[abefnrtv'"?\\] |
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149 | // ' stop editor highlighting |
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150 | octal_escape "\\"{octal}("_"?{octal}){0,2} |
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151 | hex_escape "\\""x""_"?{hex_digits} |
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152 | escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char} |
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153 | cwide_prefix "L"|"U"|"u" |
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154 | swide_prefix {cwide_prefix}|"u8" |
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155 | |
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156 | // display/white-space characters |
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157 | h_tab [\011] |
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158 | form_feed [\014] |
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159 | v_tab [\013] |
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160 | c_return [\015] |
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161 | h_white [ ]|{h_tab} |
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162 | |
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163 | // overloadable operators |
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164 | op_unary_only "~"|"!" |
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165 | op_unary_binary "+"|"-"|"*" |
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166 | op_unary_pre_post "++"|"--" |
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167 | op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post} |
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168 | |
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169 | op_binary_only "/"|"%"|"\\"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"\\="|"&="|"|="|"^="|"<<="|">>=" |
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170 | op_binary_over {op_unary_binary}|{op_binary_only} |
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171 | // op_binary_not_over "?"|"->"|"."|"&&"|"||"|"@=" |
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172 | // operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over} |
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173 | |
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174 | %x COMMENT |
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175 | %x BKQUOTE |
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176 | %x QUOTE |
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177 | %x STRING |
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178 | |
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179 | %% |
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180 | /* line directives */ |
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181 | ^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["].*"\n" { |
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182 | /* " stop editor highlighting */ |
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183 | static char filename[FILENAME_MAX]; // temporarily store current source-file name |
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184 | char *end_num; |
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185 | char *begin_string, *end_string; |
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186 | long lineno, length; |
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187 | lineno = strtol( yytext + 1, &end_num, 0 ); |
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188 | begin_string = strchr( end_num, '"' ); |
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189 | if ( begin_string ) { // file name ? |
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190 | end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter |
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191 | assert( end_string ); // closing quote ? |
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192 | length = end_string - begin_string - 1; // file-name length without quotes or sentinel |
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193 | assert( length < FILENAME_MAX ); // room for sentinel ? |
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194 | memcpy( &filename, begin_string + 1, length ); // copy file name from yytext |
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195 | filename[ length ] = '\0'; // terminate string with sentinel |
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196 | //cout << "file " << filename << " line " << lineno << endl; |
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197 | yylineno = lineno; |
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198 | yyfilename = filename; |
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199 | } // if |
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200 | } |
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201 | |
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202 | /* preprocessor-style directives */ |
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203 | ^{h_white}*"#"[^\n]*"\n" { RETURN_VAL( DIRECTIVE ); } |
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204 | |
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205 | /* ignore C style comments (ALSO HANDLED BY CPP) */ |
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206 | "/*" { BEGIN COMMENT; } |
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207 | <COMMENT>.|\n ; |
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208 | <COMMENT>"*/" { BEGIN 0; } |
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209 | |
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210 | /* ignore C++ style comments (ALSO HANDLED BY CPP) */ |
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211 | "//"[^\n]*"\n" ; |
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212 | |
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213 | /* ignore whitespace */ |
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214 | {h_white}+ { WHITE_RETURN(' '); } |
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215 | ({v_tab}|{c_return}|{form_feed})+ { WHITE_RETURN(' '); } |
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216 | ({h_white}|{v_tab}|{c_return}|{form_feed})*"\n" { NEWLINE_RETURN(); } |
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217 | |
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218 | /* keywords */ |
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219 | alignas { KEYWORD_RETURN(ALIGNAS); } // CFA |
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220 | _Alignas { KEYWORD_RETURN(ALIGNAS); } // C11 |
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221 | alignof { KEYWORD_RETURN(ALIGNOF); } // CFA |
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222 | _Alignof { KEYWORD_RETURN(ALIGNOF); } // C11 |
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223 | __alignof { KEYWORD_RETURN(ALIGNOF); } // GCC |
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224 | __alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC |
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225 | and { QKEYWORD_RETURN(WAND); } // CFA |
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226 | asm { KEYWORD_RETURN(ASM); } |
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227 | __asm { KEYWORD_RETURN(ASM); } // GCC |
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228 | __asm__ { KEYWORD_RETURN(ASM); } // GCC |
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229 | _Atomic { KEYWORD_RETURN(ATOMIC); } // C11 |
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230 | __attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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231 | __attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC |
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232 | auto { KEYWORD_RETURN(AUTO); } |
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233 | __auto_type { KEYWORD_RETURN(AUTO_TYPE); } |
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234 | basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA |
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235 | _Bool { KEYWORD_RETURN(BOOL); } // C99 |
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236 | break { KEYWORD_RETURN(BREAK); } |
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237 | case { KEYWORD_RETURN(CASE); } |
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238 | catch { QKEYWORD_RETURN(CATCH); } // CFA |
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239 | catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA |
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240 | char { KEYWORD_RETURN(CHAR); } |
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241 | choose { KEYWORD_RETURN(CHOOSE); } // CFA |
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242 | coerce { KEYWORD_RETURN(COERCE); } // CFA |
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243 | corun { KEYWORD_RETURN(CORUN); } // CFA |
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244 | cofor { KEYWORD_RETURN(COFOR); } // CFA |
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245 | _Complex { KEYWORD_RETURN(COMPLEX); } // C99 |
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246 | __complex { KEYWORD_RETURN(COMPLEX); } // GCC |
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247 | __complex__ { KEYWORD_RETURN(COMPLEX); } // GCC |
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248 | const { KEYWORD_RETURN(CONST); } |
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249 | __const { KEYWORD_RETURN(CONST); } // GCC |
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250 | __const__ { KEYWORD_RETURN(CONST); } // GCC |
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251 | continue { KEYWORD_RETURN(CONTINUE); } |
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252 | coroutine { KEYWORD_RETURN(COROUTINE); } // CFA |
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253 | _Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC |
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254 | _Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC |
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255 | _Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC |
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256 | default { KEYWORD_RETURN(DEFAULT); } |
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257 | disable { KEYWORD_RETURN(DISABLE); } // CFA |
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258 | do { KEYWORD_RETURN(DO); } |
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259 | double { KEYWORD_RETURN(DOUBLE); } |
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260 | dtype { KEYWORD_RETURN(DTYPE); } // CFA |
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261 | else { KEYWORD_RETURN(ELSE); } |
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262 | enable { KEYWORD_RETURN(ENABLE); } // CFA |
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263 | enum { KEYWORD_RETURN(ENUM); } |
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264 | exception { KEYWORD_RETURN(EXCEPTION); } // CFA |
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265 | __extension__ { KEYWORD_RETURN(EXTENSION); } // GCC |
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266 | extern { KEYWORD_RETURN(EXTERN); } |
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267 | fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA |
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268 | fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA |
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269 | finally { QKEYWORD_RETURN(FINALLY); } // CFA |
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270 | fixup { QKEYWORD_RETURN(FIXUP); } // CFA |
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271 | float { KEYWORD_RETURN(FLOAT); } |
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272 | __float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC |
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273 | float80 { KEYWORD_RETURN(uuFLOAT80); } // GCC |
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274 | __float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC |
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275 | float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC |
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276 | _Float16 { FLOATXX(uFLOAT16); } // GCC |
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277 | _Float32 { FLOATXX(uFLOAT32); } // GCC |
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278 | _Float32x { FLOATXX(uFLOAT32X); } // GCC |
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279 | _Float64 { FLOATXX(uFLOAT64); } // GCC |
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280 | _Float64x { FLOATXX(uFLOAT64X); } // GCC |
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281 | _Float128 { FLOATXX(uFLOAT128); } // GCC |
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282 | _Float128x { FLOATXX(uFLOAT128); } // GCC |
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283 | for { KEYWORD_RETURN(FOR); } |
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284 | forall { KEYWORD_RETURN(FORALL); } // CFA |
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285 | fortran { KEYWORD_RETURN(FORTRAN); } |
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286 | ftype { KEYWORD_RETURN(FTYPE); } // CFA |
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287 | generator { KEYWORD_RETURN(GENERATOR); } // CFA |
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288 | _Generic { KEYWORD_RETURN(GENERIC); } // C11 |
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289 | goto { KEYWORD_RETURN(GOTO); } |
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290 | if { KEYWORD_RETURN(IF); } |
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291 | _Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99 |
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292 | __imag { KEYWORD_RETURN(IMAGINARY); } // GCC |
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293 | __imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC |
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294 | inline { KEYWORD_RETURN(INLINE); } // C99 |
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295 | __inline { KEYWORD_RETURN(INLINE); } // GCC |
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296 | __inline__ { KEYWORD_RETURN(INLINE); } // GCC |
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297 | int { KEYWORD_RETURN(INT); } |
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298 | int128 { KEYWORD_RETURN(INT128); } // CFA |
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299 | __int128 { KEYWORD_RETURN(INT128); } // GCC |
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300 | __int128_t { KEYWORD_RETURN(INT128); } // GCC |
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301 | __label__ { KEYWORD_RETURN(LABEL); } // GCC |
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302 | long { KEYWORD_RETURN(LONG); } |
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303 | monitor { KEYWORD_RETURN(MONITOR); } // CFA |
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304 | mutex { KEYWORD_RETURN(MUTEX); } // CFA |
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305 | _Noreturn { KEYWORD_RETURN(NORETURN); } // C11 |
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306 | __builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC |
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307 | one_t { NUMERIC_RETURN(ONE_T); } // CFA |
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308 | or { QKEYWORD_RETURN(WOR); } // CFA |
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309 | otype { KEYWORD_RETURN(OTYPE); } // CFA |
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310 | recover { QKEYWORD_RETURN(RECOVER); } // CFA |
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311 | register { KEYWORD_RETURN(REGISTER); } |
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312 | report { KEYWORD_RETURN(THROWRESUME); } // CFA |
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313 | restrict { KEYWORD_RETURN(RESTRICT); } // C99 |
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314 | __restrict { KEYWORD_RETURN(RESTRICT); } // GCC |
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315 | __restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC |
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316 | return { KEYWORD_RETURN(RETURN); } |
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317 | /* resume { KEYWORD_RETURN(RESUME); } // CFA */ |
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318 | short { KEYWORD_RETURN(SHORT); } |
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319 | signed { KEYWORD_RETURN(SIGNED); } |
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320 | __signed { KEYWORD_RETURN(SIGNED); } // GCC |
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321 | __signed__ { KEYWORD_RETURN(SIGNED); } // GCC |
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322 | sizeof { KEYWORD_RETURN(SIZEOF); } |
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323 | static { KEYWORD_RETURN(STATIC); } |
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324 | _Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11 |
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325 | static_assert { KEYWORD_RETURN(STATICASSERT); } // C23 |
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326 | struct { KEYWORD_RETURN(STRUCT); } |
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327 | suspend { KEYWORD_RETURN(SUSPEND); } // CFA |
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328 | switch { KEYWORD_RETURN(SWITCH); } |
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329 | thread { KEYWORD_RETURN(THREAD); } // C11 |
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330 | __thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC |
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331 | _Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11 |
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332 | thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C23 |
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333 | throw { KEYWORD_RETURN(THROW); } // CFA |
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334 | throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA |
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335 | timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA |
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336 | trait { KEYWORD_RETURN(TRAIT); } // CFA |
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337 | try { KEYWORD_RETURN(TRY); } // CFA |
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338 | ttype { KEYWORD_RETURN(TTYPE); } // CFA |
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339 | typedef { KEYWORD_RETURN(TYPEDEF); } |
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340 | typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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341 | __typeof { KEYWORD_RETURN(TYPEOF); } // GCC |
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342 | __typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC |
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343 | typeid { KEYWORD_RETURN(TYPEID); } // GCC |
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344 | union { KEYWORD_RETURN(UNION); } |
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345 | __uint128_t { KEYWORD_RETURN(UINT128); } // GCC |
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346 | unsigned { KEYWORD_RETURN(UNSIGNED); } |
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347 | __builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC |
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348 | __builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC |
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349 | virtual { KEYWORD_RETURN(VIRTUAL); } // CFA |
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350 | void { KEYWORD_RETURN(VOID); } |
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351 | volatile { KEYWORD_RETURN(VOLATILE); } |
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352 | __volatile { KEYWORD_RETURN(VOLATILE); } // GCC |
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353 | __volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC |
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354 | vtable { KEYWORD_RETURN(VTABLE); } // CFA |
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355 | waitfor { KEYWORD_RETURN(WAITFOR); } // CFA |
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356 | waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA |
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357 | when { KEYWORD_RETURN(WHEN); } // CFA |
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358 | while { KEYWORD_RETURN(WHILE); } |
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359 | with { KEYWORD_RETURN(WITH); } // CFA |
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360 | zero_t { NUMERIC_RETURN(ZERO_T); } // CFA |
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361 | |
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362 | /* identifier */ |
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363 | {identifier} { IDENTIFIER_RETURN(); } |
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364 | "``"{identifier} { // CFA |
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365 | yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?) |
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366 | IDENTIFIER_RETURN(); |
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367 | } |
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368 | |
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369 | /* numeric constants */ |
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370 | {binary_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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371 | {octal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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372 | {decimal_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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373 | {hex_constant} { NUMERIC_RETURN(INTEGERconstant); } |
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374 | {floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant |
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375 | {floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant |
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376 | {floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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377 | {hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } |
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378 | |
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379 | /* character constant, allows empty value */ |
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380 | ({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); } |
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381 | <QUOTE>[^'\\\n]* { strtext->append( yytext, yyleng ); } |
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382 | <QUOTE>['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); } |
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383 | /* ' stop editor highlighting */ |
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384 | |
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385 | /* string constant */ |
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386 | ({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); } |
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387 | <STRING>[^"\\\n]* { strtext->append( yytext, yyleng ); } |
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388 | <STRING>["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); } |
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389 | /* " stop editor highlighting */ |
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390 | |
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391 | /* common character/string constant */ |
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392 | <QUOTE,STRING>{escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); } |
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393 | <QUOTE,STRING>"\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP) |
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394 | <QUOTE,STRING>"\\" { strtext->append( yytext, yyleng ); } // unknown escape character |
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395 | |
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396 | /* punctuation */ |
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397 | "@" { ASCIIOP_RETURN(); } |
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398 | "`" { ASCIIOP_RETURN(); } |
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399 | "[" { ASCIIOP_RETURN(); } |
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400 | "]" { ASCIIOP_RETURN(); } |
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401 | "(" { ASCIIOP_RETURN(); } |
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402 | ")" { ASCIIOP_RETURN(); } |
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403 | "{" { ASCIIOP_RETURN(); } |
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404 | "}" { ASCIIOP_RETURN(); } |
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405 | "," { ASCIIOP_RETURN(); } // also operator |
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406 | ":" { ASCIIOP_RETURN(); } |
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407 | ";" { ASCIIOP_RETURN(); } |
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408 | "." { ASCIIOP_RETURN(); } // also operator |
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409 | "@@" { NAMEDOP_RETURN(ATTR); } // CFA, attribute shorthand |
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410 | "..." { NAMEDOP_RETURN(ELLIPSIS); } |
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411 | |
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412 | /* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */ |
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413 | "<:" { RETURN_VAL('['); } |
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414 | ":>" { RETURN_VAL(']'); } |
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415 | "<%" { RETURN_VAL('{'); } |
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416 | "%>" { RETURN_VAL('}'); } |
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417 | |
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418 | /* operators */ |
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419 | "!" { ASCIIOP_RETURN(); } |
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420 | "+" { ASCIIOP_RETURN(); } |
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421 | "-" { ASCIIOP_RETURN(); } |
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422 | "*" { ASCIIOP_RETURN(); } |
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423 | "\\" { ASCIIOP_RETURN(); } // CFA, exponentiation |
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424 | "/" { ASCIIOP_RETURN(); } |
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425 | "%" { ASCIIOP_RETURN(); } |
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426 | "^" { ASCIIOP_RETURN(); } |
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427 | "~" { ASCIIOP_RETURN(); } |
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428 | "&" { ASCIIOP_RETURN(); } |
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429 | "|" { ASCIIOP_RETURN(); } |
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430 | "<" { ASCIIOP_RETURN(); } |
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431 | ">" { ASCIIOP_RETURN(); } |
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432 | "=" { ASCIIOP_RETURN(); } |
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433 | "?" { ASCIIOP_RETURN(); } |
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434 | |
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435 | "++" { NAMEDOP_RETURN(ICR); } |
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436 | "--" { NAMEDOP_RETURN(DECR); } |
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437 | "==" { NAMEDOP_RETURN(EQ); } |
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438 | "!=" { NAMEDOP_RETURN(NE); } |
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439 | "<<" { NAMEDOP_RETURN(LS); } |
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440 | ">>" { NAMEDOP_RETURN(RS); } |
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441 | "<=" { NAMEDOP_RETURN(LE); } |
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442 | ">=" { NAMEDOP_RETURN(GE); } |
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443 | "&&" { NAMEDOP_RETURN(ANDAND); } |
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444 | "||" { NAMEDOP_RETURN(OROR); } |
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445 | "->" { NAMEDOP_RETURN(ARROW); } |
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446 | "+=" { NAMEDOP_RETURN(PLUSassign); } |
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447 | "-=" { NAMEDOP_RETURN(MINUSassign); } |
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448 | "\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation |
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449 | "*=" { NAMEDOP_RETURN(MULTassign); } |
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450 | "/=" { NAMEDOP_RETURN(DIVassign); } |
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451 | "%=" { NAMEDOP_RETURN(MODassign); } |
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452 | "&=" { NAMEDOP_RETURN(ANDassign); } |
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453 | "|=" { NAMEDOP_RETURN(ORassign); } |
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454 | "^=" { NAMEDOP_RETURN(ERassign); } |
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455 | "<<=" { NAMEDOP_RETURN(LSassign); } |
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456 | ">>=" { NAMEDOP_RETURN(RSassign); } |
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457 | |
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458 | "@=" { NAMEDOP_RETURN(ATassign); } // CFA |
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459 | "~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA |
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460 | "-~" { NAMEDOP_RETURN(ErangeDown); } // CFA |
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461 | "-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA |
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462 | |
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463 | /* CFA, operator identifier */ |
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464 | {op_unary}"?" { IDENTIFIER_RETURN(); } // unary |
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465 | "?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); } |
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466 | "^?{}" { IDENTIFIER_RETURN(); } |
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467 | "?`"{identifier} { // postfix operator |
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468 | yylval.tok.str = new string( &yytext[2] ); // remove ?` |
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469 | yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix |
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470 | RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) ); |
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471 | } |
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472 | "?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary |
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473 | /* |
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474 | This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" can be |
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475 | lexed as "*?"/"*?" or "*"/"?*?". Since it is common practise to put a unary operator juxtaposed to an identifier, |
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476 | e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is |
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477 | a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then |
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478 | reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator |
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479 | identifier to disambiguate this common case. |
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480 | |
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481 | A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity |
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482 | occurs when the deference operator has no parameters, *?() and *?()(...), requiring arbitrary whitespace |
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483 | look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a |
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484 | parameter/argument to dereference *?(...). Hence, always interpreting the string *?() as * ?() does not preclude |
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485 | any meaningful program. |
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486 | |
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487 | The remaining cases are with the increment/decrement operators and conditional expression: |
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488 | |
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489 | i++? ...(...); |
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490 | i?++ ...(...); |
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491 | |
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492 | requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an |
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493 | incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a |
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494 | space: |
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495 | |
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496 | i++ ? i : 0; |
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497 | i? ++i : 0; |
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498 | */ |
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499 | {op_unary}"?"({op_unary_pre_post}|"()"|"[?]"|{op_binary_over}"?") { |
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500 | // 1 or 2 character unary operator ? |
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501 | int i = yytext[1] == '?' ? 1 : 2; |
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502 | yyless( i ); // put back characters up to first '?' |
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503 | if ( i > 1 ) { |
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504 | NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR ); |
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505 | } else { |
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506 | ASCIIOP_RETURN(); |
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507 | } // if |
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508 | } |
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509 | |
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510 | /* unknown character */ |
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511 | . { yyerror( "unknown character" ); } |
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512 | |
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513 | %% |
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514 | |
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515 | // ----end of lexer---- |
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516 | |
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517 | void yyerror( const char * errmsg ) { |
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518 | SemanticErrorThrow = true; |
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519 | cerr << (yyfilename ? yyfilename : "*unknown file*") << ':' << yylineno << ':' << column - yyleng + 1 |
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520 | << ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl; |
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521 | } |
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522 | |
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523 | // Local Variables: // |
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524 | // mode: c++ // |
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525 | // tab-width: 4 // |
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526 | // compile-command: "make install" // |
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527 | // End: // |
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