| | 1 | /* parser.h |
| | 2 | * |
| | 3 | * Copyright (c) 2006, 2007, 2009, 2010, 2011 Larry Wall and others |
| | 4 | * |
| | 5 | * You may distribute under the terms of either the GNU General Public |
| | 6 | * License or the Artistic License, as specified in the README file. |
| | 7 | * |
| | 8 | * This file defines the layout of the parser object used by the parser |
| | 9 | * and lexer (perly.c, toke.c). |
| | 10 | */ |
| | 11 | |
| | 12 | #define YYEMPTY (-2) |
| | 13 | |
| | 14 | typedef struct { |
| | 15 | YYSTYPE val; /* semantic value */ |
| | 16 | short state; |
| | 17 | I32 savestack_ix; /* size of savestack at this state */ |
| | 18 | CV *compcv; /* value of PL_compcv when this value was created */ |
| | 19 | #ifdef DEBUGGING |
| | 20 | const char *name; /* token/rule name for -Dpv */ |
| | 21 | #endif |
| | 22 | } yy_stack_frame; |
| | 23 | |
| | 24 | /* Fields that need to be shared with (i.e., visible to) inner lex- |
| | 25 | ing scopes. */ |
| | 26 | typedef struct yy_lexshared { |
| | 27 | struct yy_lexshared *ls_prev; |
| | 28 | SV *ls_linestr; /* mirrors PL_parser->linestr */ |
| | 29 | char *ls_bufptr; /* mirrors PL_parser->bufptr */ |
| | 30 | char *re_eval_start; /* start of "(?{..." text */ |
| | 31 | SV *re_eval_str; /* "(?{...})" text */ |
| | 32 | } LEXSHARED; |
| | 33 | |
| | 34 | typedef struct yy_parser { |
| | 35 | |
| | 36 | /* parser state */ |
| | 37 | |
| | 38 | struct yy_parser *old_parser; /* previous value of PL_parser */ |
| | 39 | YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */ |
| | 40 | int yychar; /* The lookahead symbol. */ |
| | 41 | |
| | 42 | /* Number of tokens to shift before error messages enabled. */ |
| | 43 | int yyerrstatus; |
| | 44 | |
| | 45 | int yylen; /* length of active reduction */ |
| | 46 | yy_stack_frame *stack; /* base of stack */ |
| | 47 | yy_stack_frame *stack_max1;/* (top-1)th element of allocated stack */ |
| | 48 | yy_stack_frame *ps; /* current stack frame */ |
| | 49 | |
| | 50 | /* lexer state */ |
| | 51 | |
| | 52 | I32 lex_brackets; /* square and curly bracket count */ |
| | 53 | I32 lex_casemods; /* casemod count */ |
| | 54 | char *lex_brackstack;/* what kind of brackets to pop */ |
| | 55 | char *lex_casestack; /* what kind of case mods in effect */ |
| | 56 | U8 lex_defer; /* state after determined token */ |
| | 57 | U8 lex_dojoin; /* doing an array interpolation |
| | 58 | 1 = @{...} 2 = ->@ */ |
| | 59 | U8 expect; /* how to interpret ambiguous tokens */ |
| | 60 | bool preambled; |
| | 61 | bool sub_no_recover; /* can't recover from a sublex error */ |
| | 62 | I32 lex_formbrack; /* bracket count at outer format level */ |
| | 63 | OP *lex_inpat; /* in pattern $) and $| are special */ |
| | 64 | OP *lex_op; /* extra info to pass back on op */ |
| | 65 | SV *lex_repl; /* runtime replacement from s/// */ |
| | 66 | U16 lex_inwhat; /* what kind of quoting are we in */ |
| | 67 | OPCODE last_lop_op; /* last named list or unary operator */ |
| | 68 | I32 lex_starts; /* how many interps done on level */ |
| | 69 | SV *lex_stuff; /* runtime pattern from m// or s/// */ |
| | 70 | I32 multi_start; /* 1st line of multi-line string */ |
| | 71 | I32 multi_end; /* last line of multi-line string */ |
| | 72 | UV multi_open; /* delimiter of said string */ |
| | 73 | UV multi_close; /* delimiter of said string */ |
| | 74 | bool lex_re_reparsing; /* we're doing G_RE_REPARSING */ |
| | 75 | U8 lex_super_state;/* lexer state to save */ |
| | 76 | U16 lex_sub_inwhat; /* "lex_inwhat" to use in sublex_push */ |
| | 77 | I32 lex_allbrackets;/* (), [], {}, ?: bracket count */ |
| | 78 | OP *lex_sub_op; /* current op in y/// or pattern */ |
| | 79 | SV *lex_sub_repl; /* repl of s/// used in sublex_push */ |
| | 80 | LEXSHARED *lex_shared; |
| | 81 | SV *linestr; /* current chunk of src text */ |
| | 82 | char *bufptr; /* carries the cursor (current parsing |
| | 83 | position) from one invocation of yylex |
| | 84 | to the next */ |
| | 85 | char *oldbufptr; /* in yylex, beginning of current token */ |
| | 86 | char *oldoldbufptr; /* in yylex, beginning of previous token */ |
| | 87 | char *bufend; |
| | 88 | char *linestart; /* beginning of most recently read line */ |
| | 89 | char *last_uni; /* position of last named-unary op */ |
| | 90 | char *last_lop; /* position of last list operator */ |
| | 91 | /* copline is used to pass a specific line number to newSTATEOP. It |
| | 92 | is a one-time line number, as newSTATEOP invalidates it (sets it to |
| | 93 | NOLINE) after using it. The purpose of this is to report line num- |
| | 94 | bers in multiline constructs using the number of the first line. */ |
| | 95 | line_t copline; |
| | 96 | U16 in_my; /* we're compiling a "my"/"our" declaration */ |
| | 97 | U8 lex_state; /* next token is determined */ |
| | 98 | U8 error_count; /* how many compile errors so far, max 10 */ |
| | 99 | U8 sub_error_count; /* the number of errors before sublexing */ |
| | 100 | HV *in_my_stash; /* declared class of this "my" declaration */ |
| | 101 | PerlIO *rsfp; /* current source file pointer */ |
| | 102 | AV *rsfp_filters; /* holds chain of active source filters */ |
| | 103 | |
| | 104 | YYSTYPE nextval[5]; /* value of next token, if any */ |
| | 105 | I32 nexttype[5]; /* type of next token */ |
| | 106 | U8 nexttoke; |
| | 107 | U8 form_lex_state; /* remember lex_state when parsing fmt */ |
| | 108 | U8 lex_fakeeof; /* precedence at which to fake EOF */ |
| | 109 | U8 lex_flags; |
| | 110 | COP *saved_curcop; /* the previous PL_curcop */ |
| | 111 | char tokenbuf[256]; |
| | 112 | line_t herelines; /* number of lines in here-doc */ |
| | 113 | line_t preambling; /* line # when processing $ENV{PERL5DB} */ |
| | 114 | |
| | 115 | bool sig_seen; /* the currently parsing sub has a signature */ |
| | 116 | /* these are valid while parsing a subroutine signature */ |
| | 117 | IV sig_elems; /* number of signature elements seen so far */ |
| | 118 | IV sig_optelems; /* number of optional signature elems seen */ |
| | 119 | char sig_slurpy; /* the sigil of the slurpy var (or null) */ |
| | 120 | |
| | 121 | bool recheck_utf8_validity; |
| | 122 | |
| | 123 | PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */ |
| | 124 | PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */ |
| | 125 | PERL_BITFIELD16 saw_infix_sigil:1; /* saw & or * or % operator */ |
| | 126 | PERL_BITFIELD16 parsed_sub:1; /* last thing parsed was a sub */ |
| | 127 | } yy_parser; |
| | 128 | |
| | 129 | /* flags for lexer API */ |
| | 130 | #define LEX_STUFF_UTF8 0x00000001 |
| | 131 | #define LEX_KEEP_PREVIOUS 0x00000002 |
| | 132 | |
| | 133 | #ifdef PERL_CORE |
| | 134 | # define LEX_START_SAME_FILTER 0x00000001 |
| | 135 | # define LEX_IGNORE_UTF8_HINTS 0x00000002 |
| | 136 | # define LEX_EVALBYTES 0x00000004 |
| | 137 | # define LEX_START_COPIED 0x00000008 |
| | 138 | # define LEX_DONT_CLOSE_RSFP 0x00000010 |
| | 139 | # define LEX_START_FLAGS \ |
| | 140 | (LEX_START_SAME_FILTER|LEX_START_COPIED \ |
| | 141 | |LEX_IGNORE_UTF8_HINTS|LEX_EVALBYTES|LEX_DONT_CLOSE_RSFP) |
| | 142 | #endif |
| | 143 | |
| | 144 | /* flags for parser API */ |
| | 145 | #define PARSE_OPTIONAL 0x00000001 |
| | 146 | |
| | 147 | /* values for lex_fakeeof */ |
| | 148 | enum { |
| | 149 | LEX_FAKEEOF_NEVER, /* don't fake EOF */ |
| | 150 | LEX_FAKEEOF_CLOSING, /* fake EOF at unmatched closing punctuation */ |
| | 151 | LEX_FAKEEOF_NONEXPR, /* ... and at token that can't be in expression */ |
| | 152 | LEX_FAKEEOF_LOWLOGIC, /* ... and at low-precedence logic operator */ |
| | 153 | LEX_FAKEEOF_COMMA, /* ... and at comma */ |
| | 154 | LEX_FAKEEOF_ASSIGN, /* ... and at assignment operator */ |
| | 155 | LEX_FAKEEOF_IFELSE, /* ... and at ?: operator */ |
| | 156 | LEX_FAKEEOF_RANGE, /* ... and at range operator */ |
| | 157 | LEX_FAKEEOF_LOGIC, /* ... and at logic operator */ |
| | 158 | LEX_FAKEEOF_BITWISE, /* ... and at bitwise operator */ |
| | 159 | LEX_FAKEEOF_COMPARE, /* ... and at comparison operator */ |
| | 160 | LEX_FAKEEOF_MAX |
| | 161 | }; |
| | 162 | |
| | 163 | /* |
| | 164 | * ex: set ts=8 sts=4 sw=4 et: |
| | 165 | */ |
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