/* * Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo * * The contents of this file are covered under the licence agreement in the * file "LICENCE" distributed with Cforall. * * lex.ll -- * * Author : Peter A. Buhr * Created On : Sat Sep 22 08:58:10 2001 * Last Modified By : Peter A. Buhr * Last Modified On : Sun Dec 15 17:23:46 2024 * Update Count : 877 */ %option yylineno %option noyywrap %option nounput %{ // The lexer assumes the program has been preprocessed by cpp. Hence, all user level preprocessor directive have been // performed and removed from the source. The only exceptions are preprocessor directives passed to the compiler (e.g., // line-number directives) and C/C++ style comments, which are ignored. // *************************** Includes and Defines **************************** #ifdef __clang__ #pragma GCC diagnostic ignored "-Wnull-conversion" #endif // trigger before each matching rule's action #define YY_USER_ACTION \ yylloc.first_line = yylineno; \ yylloc.first_column = column; \ column += yyleng; \ yylloc.last_column = column; \ yylloc.last_line = yylineno; \ yylloc.filename = yyfilename ? yyfilename : ""; unsigned int column = 0; // position of the end of the last token parsed #include #include // FILENAME_MAX using namespace std; #include "config.h" // configure info #include "DeclarationNode.hpp" // for DeclarationNode #include "ExpressionNode.hpp" // for LabelNode #include "InitializerNode.hpp" // for InitializerNode #include "ParseNode.hpp" #include "ParserTypes.hpp" // for Token #include "StatementNode.hpp" // for CondCtrl, ForCtrl #include "TypedefTable.hpp" // This (generated) header must come late as it is missing includes. #include "parser.hh" // generated info string * build_postfix_name( string * name ); char *yyfilename; string *strtext; // accumulate parts of character and string constant value #define RETURN_LOCN(x) yylval.tok.loc.file = yyfilename; yylval.tok.loc.line = yylineno; return( x ) #define RETURN_VAL(x) yylval.tok.str = new string( yytext ); RETURN_LOCN( x ) #define RETURN_CHAR(x) yylval.tok.str = nullptr; RETURN_LOCN( x ) #define RETURN_STR(x) yylval.tok.str = strtext; RETURN_LOCN( x ) #define WHITE_RETURN(x) // do nothing #define NEWLINE_RETURN() column = 0; WHITE_RETURN( '\n' ) #define ASCIIOP_RETURN() RETURN_CHAR( (int)yytext[0] ) // single character operator #define NAMEDOP_RETURN(x) RETURN_CHAR( x ) // multichar operator, with a name #define NUMERIC_RETURN(x) rm_underscore(); RETURN_VAL( x ) // numeric constant #define KEYWORD_RETURN(x) RETURN_CHAR( x ) // keyword #define QKEYWORD_RETURN(x) RETURN_VAL(x); // quasi-keyword #define IDENTIFIER_RETURN() RETURN_VAL( typedefTable.isKind( yytext ) ) #ifdef HAVE_KEYWORDS_FLOATXX // GCC >= 7 => keyword, otherwise typedef #define FLOATXX(v) KEYWORD_RETURN(v); #else #define FLOATXX(v) IDENTIFIER_RETURN(); #endif // HAVE_KEYWORDS_FLOATXX void rm_underscore() { // SKULLDUGGERY: remove underscores (ok to shorten?) yyleng = 0; for ( int i = 0; yytext[i] != '\0'; i += 1 ) { // copying non-underscore characters to front of string if ( yytext[i] != '_' ) { yytext[yyleng] = yytext[i]; yyleng += 1; } // if } // for yytext[yyleng] = '\0'; } // rm_underscore // Stop warning due to incorrectly generated flex code. #pragma GCC diagnostic ignored "-Wsign-compare" %} binary [0-1] octal [0-7] nonzero [1-9] decimal [0-9] hex [0-9a-fA-F] universal_char "\\"((u"_"?{hex_quad})|(U"_"?{hex_quad}{2})) // identifier, GCC: $ in identifier identifier ([a-zA-Z_$]|{universal_char})([0-9a-zA-Z_$]|{universal_char})* // numeric constants, CFA: '_' in constant hex_quad {hex}("_"?{hex}){3} size_opt (8|16|32|64|128)? // CFA: explicit l8/l16/l32/l64/l128, char 'hh', short 'h', int 'n' length ("ll"|"LL"|[lL]{size_opt})|("hh"|"HH"|[hHnN]) // CFA: size_t 'z', pointer 'p', which define a sign and length integer_suffix_opt ("_"?(([uU]({length}?[iI]?)|([iI]{length}))|([iI]({length}?[uU]?)|([uU]{length}))|({length}([iI]?[uU]?)|([uU][iI]))|[zZ]|[pP]))? octal_digits ({octal})|({octal}({octal}|"_")*{octal}) octal_prefix "0""_"? octal_constant (("0")|({octal_prefix}{octal_digits})){integer_suffix_opt} nonzero_digits ({nonzero})|({nonzero}({decimal}|"_")*{decimal}) decimal_constant {nonzero_digits}{integer_suffix_opt} binary_digits ({binary})|({binary}({binary}|"_")*{binary}) binary_prefix "0"[bB]"_"? binary_constant {binary_prefix}{binary_digits}{integer_suffix_opt} hex_digits ({hex})|({hex}({hex}|"_")*{hex}) hex_prefix "0"[xX]"_"? hex_constant {hex_prefix}{hex_digits}{integer_suffix_opt} // GCC: floating D (double), imaginary iI, and decimal floating DF, DD, DL exponent "_"?[eE]"_"?[+-]?{decimal_digits} floating_size 16|32|32x|64|64x|80|128|128x floating_length ([fFdDlLwWqQ]|[fF]{floating_size}) floating_suffix ({floating_length}?[iI]?)|([iI]{floating_length}) decimal_floating_suffix [dD][fFdDlL] floating_suffix_opt ("_"?({floating_suffix}|{decimal_floating_suffix}))? decimal_digits ({decimal})|({decimal}({decimal}|"_")*{decimal}) floating_decimal {decimal_digits}"."{exponent}?{floating_suffix_opt} floating_fraction "."{decimal_digits}{exponent}?{floating_suffix_opt} floating_constant ({decimal_digits}{exponent}{floating_suffix_opt})|({decimal_digits}{floating_fraction}) binary_exponent "_"?[pP]"_"?[+-]?{decimal_digits} hex_floating_suffix_opt ("_"?({floating_suffix}))? hex_floating_fraction ({hex_digits}?"."{hex_digits})|({hex_digits}".") hex_floating_constant {hex_prefix}(({hex_floating_fraction}{binary_exponent})|({hex_digits}{binary_exponent})){hex_floating_suffix_opt} // character escape sequence, GCC: \e => esc character simple_escape "\\"[abefnrtv'"?\\] // " stop editor highlighting octal_escape "\\"{octal}("_"?{octal}){0,2} hex_escape "\\""x""_"?{hex_digits} escape_seq {simple_escape}|{octal_escape}|{hex_escape}|{universal_char} cwide_prefix "L"|"U"|"u" swide_prefix {cwide_prefix}|"u8" // display/white-space characters h_tab "\t" form_feed "\f" v_tab "\v" new_line "\n" c_return "\r" h_white " "|{h_tab} v_white {v_tab}|{c_return}|{form_feed} hv_white {h_white}|{v_tab}|{new_line}|{c_return}|{form_feed} // overloadable operators op_unary_only "~"|"!" op_unary_binary "+"|"-"|"*" op_unary_pre_post "++"|"--" op_unary {op_unary_only}|{op_unary_binary}|{op_unary_pre_post} op_binary_only "/"|"%"|"\\"|"^"|"&"|"|"|"<"|">"|"="|"=="|"!="|"<<"|">>"|"<="|">="|"+="|"-="|"*="|"/="|"%="|"\\="|"&="|"|="|"^="|"<<="|">>=" op_binary_over {op_unary_binary}|{op_binary_only} // op_binary_not_over "?"|"->"|"."|"&&"|"||"|"@=" // operator {op_unary_pre_post}|{op_binary_over}|{op_binary_not_over} // C23 attributes, CPP also handles missing quote delimiter attr_string "\""([^\"\\\n]|{escape_seq})*["\n] attr_arg_opt ({hv_white}*"("({hv_white}*{attr_string}{hv_white}*)+")")? attributes "deprecated"{attr_arg_opt}|"fallthrough"|"nodiscard"{attr_arg_opt}|"maybe_unused"|"noreturn"|"_Noreturn"|"unsequenced"|"unused"|"reproducible"|{identifier}{hv_white}*"::"{hv_white}*{identifier} %x COMMENT %x QUOTE %x STRING %% /* line directives */ ^{h_white}*"#"{h_white}*[0-9]+{h_white}*["][^"\n]+["].*"\n" { /* " stop editor highlighting */ static char filename[FILENAME_MAX]; // temporarily store current source-file name char *end_num; char *begin_string, *end_string; long lineno, length; lineno = strtol( yytext + 1, &end_num, 0 ); begin_string = strchr( end_num, '"' ); if ( begin_string ) { // file name ? end_string = strchr( begin_string + 1, '"' ); // look for ending delimiter assert( end_string ); // closing quote ? length = end_string - begin_string - 1; // file-name length without quotes or sentinel assert( length < FILENAME_MAX ); // room for sentinel ? memcpy( &filename, begin_string + 1, length ); // copy file name from yytext filename[ length ] = '\0'; // terminate string with sentinel //cout << "file " << filename << " line " << lineno << endl; yylineno = lineno; yyfilename = filename; } // if } /* preprocessor-style directives */ ^{h_white}*"#"[^\n]*"\n" { RETURN_VAL( DIRECTIVE ); } /* ignore C style comments (ALSO HANDLED BY CPP) */ "/*" { BEGIN COMMENT; } .|\n ; "*/" { BEGIN 0; } /* ignore C++ style comments (ALSO HANDLED BY CPP) */ "//"[^\n]*"\n" ; /* ignore whitespace */ ({h_white}|{v_white})+ { WHITE_RETURN(' '); } // do nothing "\n" { NEWLINE_RETURN(); } // reset column counter /* keywords */ alignas { KEYWORD_RETURN(ALIGNAS); } // CFA _Alignas { KEYWORD_RETURN(ALIGNAS); } // C11 alignof { KEYWORD_RETURN(ALIGNOF); } // CFA _Alignof { KEYWORD_RETURN(ALIGNOF); } // C11 __alignof { KEYWORD_RETURN(ALIGNOF); } // GCC __alignof__ { KEYWORD_RETURN(ALIGNOF); } // GCC and { QKEYWORD_RETURN(WAND); } // CFA asm { KEYWORD_RETURN(ASM); } __asm { KEYWORD_RETURN(ASM); } // GCC __asm__ { KEYWORD_RETURN(ASM); } // GCC _Atomic { KEYWORD_RETURN(ATOMIC); } // C11 __attribute { KEYWORD_RETURN(ATTRIBUTE); } // GCC __attribute__ { KEYWORD_RETURN(ATTRIBUTE); } // GCC auto { KEYWORD_RETURN(AUTO); } __auto_type { KEYWORD_RETURN(AUTO_TYPE); } basetypeof { KEYWORD_RETURN(BASETYPEOF); } // CFA _Bool { KEYWORD_RETURN(BOOL); } // C99 __SVBool_t { KEYWORD_RETURN(SVBOOL); } // gcc (ARM) break { KEYWORD_RETURN(BREAK); } case { KEYWORD_RETURN(CASE); } catch { QKEYWORD_RETURN(CATCH); } // CFA catchResume { QKEYWORD_RETURN(CATCHRESUME); } // CFA char { KEYWORD_RETURN(CHAR); } choose { KEYWORD_RETURN(CHOOSE); } // CFA coerce { KEYWORD_RETURN(COERCE); } // CFA corun { KEYWORD_RETURN(CORUN); } // CFA cofor { KEYWORD_RETURN(COFOR); } // CFA _Complex { KEYWORD_RETURN(COMPLEX); } // C99 __complex { KEYWORD_RETURN(COMPLEX); } // GCC __complex__ { KEYWORD_RETURN(COMPLEX); } // GCC const { KEYWORD_RETURN(CONST); } __const { KEYWORD_RETURN(CONST); } // GCC __const__ { KEYWORD_RETURN(CONST); } // GCC continue { KEYWORD_RETURN(CONTINUE); } coroutine { KEYWORD_RETURN(COROUTINE); } // CFA _Decimal32 { KEYWORD_RETURN(DECIMAL32); } // GCC _Decimal64 { KEYWORD_RETURN(DECIMAL64); } // GCC _Decimal128 { KEYWORD_RETURN(DECIMAL128); } // GCC default { KEYWORD_RETURN(DEFAULT); } disable { KEYWORD_RETURN(DISABLE); } // CFA do { KEYWORD_RETURN(DO); } double { KEYWORD_RETURN(DOUBLE); } dtype { KEYWORD_RETURN(DTYPE); } // CFA else { KEYWORD_RETURN(ELSE); } enable { KEYWORD_RETURN(ENABLE); } // CFA enum { KEYWORD_RETURN(ENUM); } exception { KEYWORD_RETURN(EXCEPTION); } // CFA __extension__ { KEYWORD_RETURN(EXTENSION); } // GCC extern { KEYWORD_RETURN(EXTERN); } fallthrough { KEYWORD_RETURN(FALLTHROUGH); } // CFA fallthru { KEYWORD_RETURN(FALLTHRU); } // CFA finally { QKEYWORD_RETURN(FINALLY); } // CFA fixup { QKEYWORD_RETURN(FIXUP); } // CFA float { KEYWORD_RETURN(FLOAT); } __float80 { KEYWORD_RETURN(FLOAT80); } // GCC float80 { KEYWORD_RETURN(FLOAT80); } // GCC __float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC float128 { KEYWORD_RETURN(uuFLOAT128); } // GCC _Float16 { FLOATXX(FLOAT16); } // GCC _Float32 { FLOATXX(FLOAT32); } // GCC _Float32x { FLOATXX(FLOAT32X); } // GCC _Float64 { FLOATXX(FLOAT64); } // GCC _Float64x { FLOATXX(FLOAT64X); } // GCC _Float128 { FLOATXX(FLOAT128); } // GCC _Float128x { FLOATXX(FLOAT128X); } // GCC __Float32x4_t { FLOATXX(FLOAT32X4); } // GCC (ARM) __Float64x2_t { FLOATXX(FLOAT64X2); } // GCC (ARM) __SVFloat32_t { FLOATXX(SVFLOAT32); } // GCC (ARM) __SVFloat64_t { FLOATXX(SVFLOAT64); } // GCC (ARM) for { KEYWORD_RETURN(FOR); } forall { KEYWORD_RETURN(FORALL); } // CFA fortran { KEYWORD_RETURN(FORTRAN); } ftype { KEYWORD_RETURN(FTYPE); } // CFA generator { KEYWORD_RETURN(GENERATOR); } // CFA _Generic { KEYWORD_RETURN(GENERIC); } // C11 goto { KEYWORD_RETURN(GOTO); } if { KEYWORD_RETURN(IF); } _Imaginary { KEYWORD_RETURN(IMAGINARY); } // C99 __imag { KEYWORD_RETURN(IMAGINARY); } // GCC __imag__ { KEYWORD_RETURN(IMAGINARY); } // GCC inline { KEYWORD_RETURN(INLINE); } // C99 __inline { KEYWORD_RETURN(INLINE); } // GCC __inline__ { KEYWORD_RETURN(INLINE); } // GCC int { KEYWORD_RETURN(INT); } int128 { KEYWORD_RETURN(INT128); } // CFA __int128 { KEYWORD_RETURN(INT128); } // GCC __int128_t { KEYWORD_RETURN(INT128); } // GCC __label__ { KEYWORD_RETURN(LABEL); } // GCC long { KEYWORD_RETURN(LONG); } monitor { KEYWORD_RETURN(MONITOR); } // CFA mutex { KEYWORD_RETURN(MUTEX); } // CFA _Noreturn { KEYWORD_RETURN(NORETURN); } // C11 __builtin_offsetof { KEYWORD_RETURN(OFFSETOF); } // GCC one_t { NUMERIC_RETURN(ONE_T); } // CFA or { QKEYWORD_RETURN(WOR); } // CFA otype { KEYWORD_RETURN(OTYPE); } // CFA recover { QKEYWORD_RETURN(RECOVER); } // CFA register { KEYWORD_RETURN(REGISTER); } report { KEYWORD_RETURN(THROWRESUME); } // CFA restrict { KEYWORD_RETURN(RESTRICT); } // C99 __restrict { KEYWORD_RETURN(RESTRICT); } // GCC __restrict__ { KEYWORD_RETURN(RESTRICT); } // GCC return { KEYWORD_RETURN(RETURN); } /* resume { KEYWORD_RETURN(RESUME); } // CFA */ short { KEYWORD_RETURN(SHORT); } signed { KEYWORD_RETURN(SIGNED); } __signed { KEYWORD_RETURN(SIGNED); } // GCC __signed__ { KEYWORD_RETURN(SIGNED); } // GCC sizeof { KEYWORD_RETURN(SIZEOF); } countof { KEYWORD_RETURN(COUNTOF); } // GCC static { KEYWORD_RETURN(STATIC); } _Static_assert { KEYWORD_RETURN(STATICASSERT); } // C11 static_assert { KEYWORD_RETURN(STATICASSERT); } // C23 struct { KEYWORD_RETURN(STRUCT); } suspend { KEYWORD_RETURN(SUSPEND); } // CFA switch { KEYWORD_RETURN(SWITCH); } thread { KEYWORD_RETURN(THREAD); } // C11 __thread { KEYWORD_RETURN(THREADLOCALGCC); } // GCC _Thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C11 thread_local { KEYWORD_RETURN(THREADLOCALC11); } // C23 throw { KEYWORD_RETURN(THROW); } // CFA throwResume { KEYWORD_RETURN(THROWRESUME); } // CFA timeout { QKEYWORD_RETURN(TIMEOUT); } // CFA trait { KEYWORD_RETURN(TRAIT); } // CFA try { KEYWORD_RETURN(TRY); } // CFA ttype { KEYWORD_RETURN(TTYPE); } // CFA typedef { KEYWORD_RETURN(TYPEDEF); } typeof { KEYWORD_RETURN(TYPEOF); } // GCC __typeof { KEYWORD_RETURN(TYPEOF); } // GCC __typeof__ { KEYWORD_RETURN(TYPEOF); } // GCC typeid { KEYWORD_RETURN(TYPEID); } // GCC union { KEYWORD_RETURN(UNION); } __uint128_t { KEYWORD_RETURN(UINT128); } // GCC unsigned { KEYWORD_RETURN(UNSIGNED); } __builtin_va_arg { KEYWORD_RETURN(VA_ARG); } // GCC __builtin_va_list { KEYWORD_RETURN(VA_LIST); } // GCC virtual { KEYWORD_RETURN(VIRTUAL); } // CFA void { KEYWORD_RETURN(VOID); } volatile { KEYWORD_RETURN(VOLATILE); } __volatile { KEYWORD_RETURN(VOLATILE); } // GCC __volatile__ { KEYWORD_RETURN(VOLATILE); } // GCC vtable { KEYWORD_RETURN(VTABLE); } // CFA waitfor { KEYWORD_RETURN(WAITFOR); } // CFA waituntil { KEYWORD_RETURN(WAITUNTIL); } // CFA when { KEYWORD_RETURN(WHEN); } // CFA while { KEYWORD_RETURN(WHILE); } with { KEYWORD_RETURN(WITH); } // CFA zero_t { NUMERIC_RETURN(ZERO_T); } // CFA /* identifier */ {identifier} { IDENTIFIER_RETURN(); } "``"{identifier} { // CFA yytext[yyleng] = '\0'; yytext += 2; // SKULLDUGGERY: remove backquotes (ok to shorten?) IDENTIFIER_RETURN(); } /* C23 attributes */ "[["{hv_white}*{attributes}({hv_white}*","{hv_white}*{attributes})*{hv_white}*"]]" { strtext = new string( &yytext[2], yyleng - 4 ); // remove delimiters "[[" and "]]" RETURN_STR(C23_ATTRIBUTE); } /* numeric constants */ {binary_constant} { NUMERIC_RETURN(INTEGERconstant); } {octal_constant} { NUMERIC_RETURN(INTEGERconstant); } {decimal_constant} { NUMERIC_RETURN(INTEGERconstant); } {hex_constant} { NUMERIC_RETURN(INTEGERconstant); } {floating_decimal} { NUMERIC_RETURN(FLOATING_DECIMALconstant); } // must appear before floating_constant {floating_fraction} { NUMERIC_RETURN(FLOATING_FRACTIONconstant); } // must appear before floating_constant {floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } {hex_floating_constant} { NUMERIC_RETURN(FLOATINGconstant); } /* character constant, allows empty value, CPP also handles missing quote delimiter */ ({cwide_prefix}[_]?)?['] { BEGIN QUOTE; rm_underscore(); strtext = new string( yytext, yyleng ); } [^'\\\n]* { strtext->append( yytext, yyleng ); } ['\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(CHARACTERconstant); } /* ' stop editor highlighting */ /* string constant, CPP also handles missing quote delimiter */ ({swide_prefix}[_]?)?["] { BEGIN STRING; rm_underscore(); strtext = new string( yytext, yyleng ); } [^"\\\n]* { strtext->append( yytext, yyleng ); } ["\n] { BEGIN 0; strtext->append( yytext, yyleng ); RETURN_STR(STRINGliteral); } /* " stop editor highlighting */ /* common character/string constant */ {escape_seq} { rm_underscore(); strtext->append( yytext, yyleng ); } "\\"{h_white}*"\n" {} // continuation (ALSO HANDLED BY CPP) "\\" { strtext->append( yytext, yyleng ); } // unknown escape character /* punctuation */ "@" { ASCIIOP_RETURN(); } "`" { ASCIIOP_RETURN(); } "[" { ASCIIOP_RETURN(); } "]" { ASCIIOP_RETURN(); } "(" { ASCIIOP_RETURN(); } ")" { ASCIIOP_RETURN(); } "{" { ASCIIOP_RETURN(); } "}" { ASCIIOP_RETURN(); } "," { ASCIIOP_RETURN(); } // also operator ":" { ASCIIOP_RETURN(); } ";" { ASCIIOP_RETURN(); } "." { ASCIIOP_RETURN(); } // also operator "@[" { NAMEDOP_RETURN(ATTR); } // CFA, attribute shorthand "..." { NAMEDOP_RETURN(ELLIPSIS); } /* alternative C99 brackets, "<:" & "<:<:" handled by preprocessor */ "<:" { RETURN_VAL('['); } ":>" { RETURN_VAL(']'); } "<%" { RETURN_VAL('{'); } "%>" { RETURN_VAL('}'); } /* operators */ "!" { ASCIIOP_RETURN(); } "+" { ASCIIOP_RETURN(); } "-" { ASCIIOP_RETURN(); } "*" { ASCIIOP_RETURN(); } "\\" { ASCIIOP_RETURN(); } // CFA, exponentiation "/" { ASCIIOP_RETURN(); } "%" { ASCIIOP_RETURN(); } "^" { ASCIIOP_RETURN(); } "~" { ASCIIOP_RETURN(); } "&" { ASCIIOP_RETURN(); } "|" { ASCIIOP_RETURN(); } "<" { ASCIIOP_RETURN(); } ">" { ASCIIOP_RETURN(); } "=" { ASCIIOP_RETURN(); } "?" { ASCIIOP_RETURN(); } "++" { NAMEDOP_RETURN(ICR); } "--" { NAMEDOP_RETURN(DECR); } "==" { NAMEDOP_RETURN(EQ); } "!=" { NAMEDOP_RETURN(NE); } "<<" { NAMEDOP_RETURN(LS); } ">>" { NAMEDOP_RETURN(RS); } "<=" { NAMEDOP_RETURN(LE); } ">=" { NAMEDOP_RETURN(GE); } "&&" { NAMEDOP_RETURN(ANDAND); } "||" { NAMEDOP_RETURN(OROR); } "->" { NAMEDOP_RETURN(ARROW); } "+=" { NAMEDOP_RETURN(PLUSassign); } "-=" { NAMEDOP_RETURN(MINUSassign); } "\\=" { NAMEDOP_RETURN(EXPassign); } // CFA, exponentiation "*=" { NAMEDOP_RETURN(MULTassign); } "/=" { NAMEDOP_RETURN(DIVassign); } "%=" { NAMEDOP_RETURN(MODassign); } "&=" { NAMEDOP_RETURN(ANDassign); } "|=" { NAMEDOP_RETURN(ORassign); } "^=" { NAMEDOP_RETURN(ERassign); } "<<=" { NAMEDOP_RETURN(LSassign); } ">>=" { NAMEDOP_RETURN(RSassign); } "@=" { NAMEDOP_RETURN(ATassign); } // CFA "+~" { NAMEDOP_RETURN(ErangeUp); } // CFA "~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA "+~=" { NAMEDOP_RETURN(ErangeUpEq); } // CFA "-~" { NAMEDOP_RETURN(ErangeDown); } // CFA "-~=" { NAMEDOP_RETURN(ErangeDownEq); } // CFA /* CFA, operator identifier */ {op_unary}"?" { IDENTIFIER_RETURN(); } // unary "?"({op_unary_pre_post}|"()"|"[?]"|"{}") { IDENTIFIER_RETURN(); } "^?{}" { IDENTIFIER_RETURN(); } "?`"{identifier} { // postfix operator yylval.tok.str = new string( &yytext[2] ); // remove ?` yylval.tok.str = build_postfix_name( yylval.tok.str ); // add prefix RETURN_LOCN( typedefTable.isKind( *yylval.tok.str ) ); } "?"{op_binary_over}"?" { IDENTIFIER_RETURN(); } // binary /* This rule handles ambiguous cases with operator identifiers, e.g., "int *?*?()", where the string "*?*?" can be lexed as "*?"/"*?" or "*"/"?*?". Since it is common practise to put a unary operator juxtaposed to an identifier, e.g., "*i", users will be annoyed if they cannot do this with respect to operator identifiers. Therefore, there is a lexical look-ahead for the second case, with backtracking to return the leading unary operator and then reparsing the trailing operator identifier. Otherwise a space is needed between the unary operator and operator identifier to disambiguate this common case. A similar issue occurs with the dereference, *?(...), and routine-call, ?()(...) identifiers. The ambiguity occurs when the deference operator has no parameters, *?() and *?()(...), requiring arbitrary whitespace look-ahead for the routine-call parameter-list to disambiguate. However, the dereference operator must have a parameter/argument to dereference *?(...). Hence, always interpreting the string *?() as * ?() does not preclude any meaningful program. The remaining cases are with the increment/decrement operators and conditional expression: i++? ...(...); i?++ ...(...); requiring arbitrary whitespace look-ahead for the operator parameter-list, even though that interpretation is an incorrect expression (juxtaposed identifiers). Therefore, it is necessary to disambiguate these cases with a space: i++ ? i : 0; i? ++i : 0; */ {op_unary}"?"({op_unary_pre_post}|"()"|"[?]"|{op_binary_over}"?") { // 1 or 2 character unary operator ? int i = yytext[1] == '?' ? 1 : 2; yyless( i ); // put back characters up to first '?' if ( i > 1 ) { NAMEDOP_RETURN( yytext[0] == '+' ? ICR : DECR ); } else { ASCIIOP_RETURN(); } // if } /* unknown character */ . { yyerror( "unknown character" ); } %% // ----end of lexer---- void yyerror( const char * errmsg ) { SemanticErrorThrow = true; cerr << (yyfilename ? yyfilename : "*unknown file*") << ':' << yylineno << ':' << column - yyleng + 1 << ": " << ErrorHelpers::error_str() << errmsg << " before token \"" << (yytext[0] == '\0' ? "EOF" : yytext) << '"' << endl; } // Local Variables: // // mode: c++ // // tab-width: 4 // // compile-command: "make install" // // End: //