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Avoid redundant copies in string evals
[perl5.git] / parser.h
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1/* parser.h
2 *
bc641c27 3 * Copyright (c) 2006, 2007, Larry Wall and others
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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
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12#define YYEMPTY (-2)
13
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14typedef struct {
15 YYSTYPE val; /* semantic value */
16 short state;
33703721 17 I32 savestack_ix; /* size of savestack at this state */
8c63ea58 18 CV *compcv; /* value of PL_compcv when this value was created */
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19#ifdef DEBUGGING
20 const char *name; /* token/rule name for -Dpv */
21#endif
22} yy_stack_frame;
23
22735491 24typedef struct yy_parser {
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25
26 /* parser state */
27
22735491 28 struct yy_parser *old_parser; /* previous value of PL_parser */
5912531f 29 YYSTYPE yylval; /* value of lookahead symbol, set by yylex() */
9bd87817 30 int yychar; /* The lookahead symbol. */
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31
32 /* Number of tokens to shift before error messages enabled. */
33 int yyerrstatus;
34
35 int stack_size;
36 int yylen; /* length of active reduction */
22735491 37 yy_stack_frame *stack; /* base of stack */
5912531f 38 yy_stack_frame *ps; /* current stack frame */
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39
40 /* lexer state */
41
78cdf107 42 I32 lex_brackets; /* square and curly bracket count */
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43 I32 lex_casemods; /* casemod count */
44 char *lex_brackstack;/* what kind of brackets to pop */
45 char *lex_casestack; /* what kind of case mods in effect */
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46 U8 lex_defer; /* state after determined token */
47 bool lex_dojoin; /* doing an array interpolation */
48 U8 lex_expect; /* expect after determined token */
53a7735b 49 U8 expect; /* how to interpret ambiguous tokens */
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50 I32 lex_formbrack; /* bracket count at outer format level */
51 OP *lex_inpat; /* in pattern $) and $| are special */
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52 OP *lex_op; /* extra info to pass back on op */
53 SV *lex_repl; /* runtime replacement from s/// */
651b5b28 54 U16 lex_inwhat; /* what kind of quoting are we in */
f06b5848 55 OPCODE last_lop_op; /* last list operator */
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56 I32 lex_starts; /* how many interps done on level */
57 SV *lex_stuff; /* runtime pattern from m// or s/// */
58 I32 multi_start; /* 1st line of multi-line string */
670a9cb2 59 I32 multi_end; /* last line of multi-line string */
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60 char multi_open; /* delimiter of said string */
61 char multi_close; /* delimiter of said string */
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62 char pending_ident; /* pending identifier lookup */
63 bool preambled;
78cdf107 64 I32 lex_allbrackets;/* (), [], {}, ?: bracket count */
199e78b7 65 SUBLEXINFO sublex_info;
bdc0bf6f 66 SV *linestr; /* current chunk of src text */
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67 char *bufptr;
68 char *oldbufptr;
69 char *oldoldbufptr;
70 char *bufend;
71 char *linestart; /* beginning of most recently read line */
72 char *last_uni; /* position of last named-unary op */
73 char *last_lop; /* position of last list operator */
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74 line_t copline; /* current line number */
75 U16 in_my; /* we're compiling a "my"/"our" declaration */
bc177e6b 76 U8 lex_state; /* next token is determined */
1f0c31d7 77 U8 error_count; /* how many compile errors so far, max 10 */
12bd6ede 78 HV *in_my_stash; /* declared class of this "my" declaration */
2f9285f8 79 PerlIO *rsfp; /* current source file pointer */
5486870f 80 AV *rsfp_filters; /* holds chain of active source filters */
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81
82#ifdef PERL_MAD
83 SV *endwhite;
84 I32 faketokens;
85 I32 lasttoke;
86 SV *nextwhite;
87 I32 realtokenstart;
88 SV *skipwhite;
89 SV *thisclose;
90 MADPROP * thismad;
91 SV *thisopen;
92 SV *thisstuff;
93 SV *thistoken;
94 SV *thiswhite;
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95
96/* What we know when we're in LEX_KNOWNEXT state. */
97 NEXTTOKE nexttoke[5]; /* value of next token, if any */
98 I32 curforce;
99#else
100 YYSTYPE nextval[5]; /* value of next token, if any */
101 I32 nexttype[5]; /* type of next token */
102 I32 nexttoke;
199e78b7 103#endif
fb205e7a 104
7c4baf47 105 COP *saved_curcop; /* the previous PL_curcop */
14047fc9 106 char tokenbuf[256];
7c4baf47 107
78cdf107 108 U8 lex_fakeeof; /* precedence at which to fake EOF */
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109 PERL_BITFIELD16 lex_flags:14;
110 PERL_BITFIELD16 in_pod:1; /* lexer is within a =pod section */
111 PERL_BITFIELD16 filtered:1; /* source filters in evalbytes */
5912531f 112} yy_parser;
5912531f 113
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114/* flags for lexer API */
115#define LEX_STUFF_UTF8 0x00000001
116#define LEX_KEEP_PREVIOUS 0x00000002
17e00314 117
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118#ifdef PERL_CORE
119# define LEX_START_SAME_FILTER 0x00000001
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120# define LEX_IGNORE_UTF8_HINTS 0x00000002
121# define LEX_EVALBYTES 0x00000004
0abcdfa4 122# define LEX_START_COPIED 0x00000008
60d63348 123# define LEX_START_FLAGS \
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124 (LEX_START_SAME_FILTER|LEX_START_COPIED \
125 |LEX_IGNORE_UTF8_HINTS|LEX_EVALBYTES)
27fcb6ee 126#endif
f0e67a1d 127
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128/* flags for parser API */
129#define PARSE_OPTIONAL 0x00000001
130
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131/* values for lex_fakeeof */
132enum {
133 LEX_FAKEEOF_NEVER, /* don't fake EOF */
134 LEX_FAKEEOF_CLOSING, /* fake EOF at unmatched closing punctuation */
135 LEX_FAKEEOF_NONEXPR, /* ... and at token that can't be in expression */
136 LEX_FAKEEOF_LOWLOGIC, /* ... and at low-precedence logic operator */
137 LEX_FAKEEOF_COMMA, /* ... and at comma */
138 LEX_FAKEEOF_ASSIGN, /* ... and at assignment operator */
139 LEX_FAKEEOF_IFELSE, /* ... and at ?: operator */
140 LEX_FAKEEOF_RANGE, /* ... and at range operator */
141 LEX_FAKEEOF_LOGIC, /* ... and at logic operator */
142 LEX_FAKEEOF_BITWISE, /* ... and at bitwise operator */
143 LEX_FAKEEOF_COMPARE, /* ... and at comparison operator */
144 LEX_FAKEEOF_MAX
145};
146
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147/*
148 * Local variables:
149 * c-indentation-style: bsd
150 * c-basic-offset: 4
151 * indent-tabs-mode: t
152 * End:
153 *
154 * ex: set ts=8 sts=4 sw=4 noet:
155 */