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1 | /* $RCSfile: cmd.h,v $$Revision: 4.0.1.1 $$Date: 91/06/07 10:28:50 $ |
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2 | * |
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3 | * Copyright (c) 1991, Larry Wall |
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4 | * |
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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. |
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7 | * |
8 | * $Log: cmd.h,v $ |
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9 | * Revision 4.0.1.1 91/06/07 10:28:50 lwall |
10 | * patch4: new copyright notice |
11 | * patch4: length($`), length($&), length($') now optimized to avoid string copy |
12 | * |
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13 | * Revision 4.0 91/03/20 01:04:34 lwall |
14 | * 4.0 baseline. |
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15 | * |
16 | */ |
17 | |
18 | #define C_NULL 0 |
19 | #define C_IF 1 |
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20 | #define C_ELSE 2 |
21 | #define C_WHILE 3 |
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22 | #define C_BLOCK 4 |
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23 | #define C_EXPR 5 |
24 | #define C_NEXT 6 |
25 | #define C_ELSIF 7 /* temporary--turns into an IF + ELSE */ |
26 | #define C_CSWITCH 8 /* created by switch optimization in block_head() */ |
27 | #define C_NSWITCH 9 /* likewise */ |
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28 | |
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29 | #ifdef DEBUGGING |
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30 | #ifndef DOINIT |
31 | extern char *cmdname[]; |
32 | #else |
33 | char *cmdname[] = { |
34 | "NULL", |
35 | "IF", |
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36 | "ELSE", |
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37 | "WHILE", |
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38 | "BLOCK", |
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39 | "EXPR", |
40 | "NEXT", |
41 | "ELSIF", |
42 | "CSWITCH", |
43 | "NSWITCH", |
44 | "10" |
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45 | }; |
46 | #endif |
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47 | #endif /* DEBUGGING */ |
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48 | |
49 | #define CF_OPTIMIZE 077 /* type of optimization */ |
50 | #define CF_FIRSTNEG 0100/* conditional is ($register NE 'string') */ |
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51 | #define CF_NESURE 0200 /* if short doesn't match we're sure */ |
52 | #define CF_EQSURE 0400 /* if short does match we're sure */ |
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53 | #define CF_COND 01000 /* test c_expr as conditional first, if not null. */ |
54 | /* Set for everything except do {} while currently */ |
55 | #define CF_LOOP 02000 /* loop on the c_expr conditional (loop modifiers) */ |
56 | #define CF_INVERT 04000 /* it's an "unless" or an "until" */ |
57 | #define CF_ONCE 010000 /* we've already pushed the label on the stack */ |
58 | #define CF_FLIP 020000 /* on a match do flipflop */ |
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59 | #define CF_TERM 040000 /* value of this cmd might be returned */ |
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60 | #define CF_DBSUB 0100000 /* this is an inserted cmd for debugging */ |
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61 | |
62 | #define CFT_FALSE 0 /* c_expr is always false */ |
63 | #define CFT_TRUE 1 /* c_expr is always true */ |
64 | #define CFT_REG 2 /* c_expr is a simple register */ |
65 | #define CFT_ANCHOR 3 /* c_expr is an anchored search /^.../ */ |
66 | #define CFT_STROP 4 /* c_expr is a string comparison */ |
67 | #define CFT_SCAN 5 /* c_expr is an unanchored search /.../ */ |
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68 | #define CFT_GETS 6 /* c_expr is <filehandle> */ |
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69 | #define CFT_EVAL 7 /* c_expr is not optimized, so call eval() */ |
70 | #define CFT_UNFLIP 8 /* 2nd half of range not optimized */ |
71 | #define CFT_CHOP 9 /* c_expr is a chop on a register */ |
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72 | #define CFT_ARRAY 10 /* this is a foreach loop */ |
73 | #define CFT_INDGETS 11 /* c_expr is <$variable> */ |
74 | #define CFT_NUMOP 12 /* c_expr is a numeric comparison */ |
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75 | #define CFT_CCLASS 13 /* c_expr must start with one of these characters */ |
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76 | #define CFT_D0 14 /* no special breakpoint at this line */ |
77 | #define CFT_D1 15 /* possible special breakpoint at this line */ |
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78 | |
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79 | #ifdef DEBUGGING |
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80 | #ifndef DOINIT |
81 | extern char *cmdopt[]; |
82 | #else |
83 | char *cmdopt[] = { |
84 | "FALSE", |
85 | "TRUE", |
86 | "REG", |
87 | "ANCHOR", |
88 | "STROP", |
89 | "SCAN", |
90 | "GETS", |
91 | "EVAL", |
92 | "UNFLIP", |
93 | "CHOP", |
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94 | "ARRAY", |
95 | "INDGETS", |
96 | "NUMOP", |
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97 | "CCLASS", |
98 | "14" |
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99 | }; |
100 | #endif |
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101 | #endif /* DEBUGGING */ |
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102 | |
103 | struct acmd { |
104 | STAB *ac_stab; /* a symbol table entry */ |
105 | ARG *ac_expr; /* any associated expression */ |
106 | }; |
107 | |
108 | struct ccmd { |
109 | CMD *cc_true; /* normal code to do on if and while */ |
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110 | CMD *cc_alt; /* else cmd ptr or continue code */ |
111 | }; |
112 | |
113 | struct scmd { |
114 | CMD **sc_next; /* array of pointers to commands */ |
115 | short sc_offset; /* first value - 1 */ |
116 | short sc_max; /* last value + 1 */ |
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117 | }; |
118 | |
119 | struct cmd { |
120 | CMD *c_next; /* the next command at this level */ |
121 | ARG *c_expr; /* conditional expression */ |
122 | CMD *c_head; /* head of this command list */ |
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123 | STR *c_short; /* string to match as shortcut */ |
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124 | STAB *c_stab; /* a symbol table entry, mostly for fp */ |
125 | SPAT *c_spat; /* pattern used by optimization */ |
126 | char *c_label; /* label for this construct */ |
127 | union ucmd { |
128 | struct acmd acmd; /* normal command */ |
129 | struct ccmd ccmd; /* compound command */ |
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130 | struct scmd scmd; /* switch command */ |
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131 | } ucmd; |
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132 | short c_slen; /* len of c_short, if not null */ |
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133 | VOLATILE short c_flags; /* optimization flags--see above */ |
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134 | HASH *c_stash; /* package line was compiled in */ |
135 | STAB *c_filestab; /* file the following line # is from */ |
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136 | line_t c_line; /* line # of this command */ |
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137 | char c_type; /* what this command does */ |
138 | }; |
139 | |
140 | #define Nullcmd Null(CMD*) |
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141 | #define Nullcsv Null(CSV*) |
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142 | |
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143 | EXT CMD * VOLATILE main_root INIT(Nullcmd); |
144 | EXT CMD * VOLATILE eval_root INIT(Nullcmd); |
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145 | |
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146 | EXT CMD compiling; |
147 | EXT CMD * VOLATILE curcmd INIT(&compiling); |
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148 | EXT CSV * VOLATILE curcsv INIT(Nullcsv); |
149 | |
150 | struct callsave { |
151 | SUBR *sub; |
152 | STAB *stab; |
153 | CSV *curcsv; |
154 | CMD *curcmd; |
155 | ARRAY *savearray; |
156 | ARRAY *argarray; |
157 | long depth; |
158 | int wantarray; |
159 | char hasargs; |
160 | }; |
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161 | |
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162 | struct compcmd { |
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163 | CMD *comp_true; |
164 | CMD *comp_alt; |
165 | }; |
166 | |
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167 | void opt_arg(); |
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168 | ARG* evalstatic(); |
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169 | int cmd_exec(); |