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1 | /* $Header: cmd.h,v 3.0.1.1 89/10/26 23:05:43 lwall Locked $ |
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2 | * |
3 | * Copyright (c) 1989, Larry Wall |
4 | * |
5 | * You may distribute under the terms of the GNU General Public License |
6 | * as specified in the README file that comes with the perl 3.0 kit. |
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7 | * |
8 | * $Log: cmd.h,v $ |
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9 | * Revision 3.0.1.1 89/10/26 23:05:43 lwall |
10 | * patch1: unless was broken when run under the debugger |
11 | * |
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12 | * Revision 3.0 89/10/18 15:09:15 lwall |
13 | * 3.0 baseline |
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14 | * |
15 | */ |
16 | |
17 | #define C_NULL 0 |
18 | #define C_IF 1 |
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19 | #define C_ELSE 2 |
20 | #define C_WHILE 3 |
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21 | #define C_BLOCK 4 |
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22 | #define C_EXPR 5 |
23 | #define C_NEXT 6 |
24 | #define C_ELSIF 7 /* temporary--turns into an IF + ELSE */ |
25 | #define C_CSWITCH 8 /* created by switch optimization in block_head() */ |
26 | #define C_NSWITCH 9 /* likewise */ |
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27 | |
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28 | #ifdef DEBUGGING |
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29 | #ifndef DOINIT |
30 | extern char *cmdname[]; |
31 | #else |
32 | char *cmdname[] = { |
33 | "NULL", |
34 | "IF", |
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35 | "ELSE", |
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36 | "WHILE", |
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37 | "BLOCK", |
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38 | "EXPR", |
39 | "NEXT", |
40 | "ELSIF", |
41 | "CSWITCH", |
42 | "NSWITCH", |
43 | "10" |
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44 | }; |
45 | #endif |
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46 | #endif /* DEBUGGING */ |
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47 | |
48 | #define CF_OPTIMIZE 077 /* type of optimization */ |
49 | #define CF_FIRSTNEG 0100/* conditional is ($register NE 'string') */ |
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50 | #define CF_NESURE 0200 /* if short doesn't match we're sure */ |
51 | #define CF_EQSURE 0400 /* if short does match we're sure */ |
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52 | #define CF_COND 01000 /* test c_expr as conditional first, if not null. */ |
53 | /* Set for everything except do {} while currently */ |
54 | #define CF_LOOP 02000 /* loop on the c_expr conditional (loop modifiers) */ |
55 | #define CF_INVERT 04000 /* it's an "unless" or an "until" */ |
56 | #define CF_ONCE 010000 /* we've already pushed the label on the stack */ |
57 | #define CF_FLIP 020000 /* on a match do flipflop */ |
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58 | #define CF_TERM 040000 /* value of this cmd might be returned */ |
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59 | #define CF_DBSUB 0100000 /* this is an inserted cmd for debugging */ |
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60 | |
61 | #define CFT_FALSE 0 /* c_expr is always false */ |
62 | #define CFT_TRUE 1 /* c_expr is always true */ |
63 | #define CFT_REG 2 /* c_expr is a simple register */ |
64 | #define CFT_ANCHOR 3 /* c_expr is an anchored search /^.../ */ |
65 | #define CFT_STROP 4 /* c_expr is a string comparison */ |
66 | #define CFT_SCAN 5 /* c_expr is an unanchored search /.../ */ |
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67 | #define CFT_GETS 6 /* c_expr is <filehandle> */ |
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68 | #define CFT_EVAL 7 /* c_expr is not optimized, so call eval() */ |
69 | #define CFT_UNFLIP 8 /* 2nd half of range not optimized */ |
70 | #define CFT_CHOP 9 /* c_expr is a chop on a register */ |
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71 | #define CFT_ARRAY 10 /* this is a foreach loop */ |
72 | #define CFT_INDGETS 11 /* c_expr is <$variable> */ |
73 | #define CFT_NUMOP 12 /* c_expr is a numeric comparison */ |
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74 | #define CFT_CCLASS 13 /* c_expr must start with one of these characters */ |
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75 | |
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76 | #ifdef DEBUGGING |
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77 | #ifndef DOINIT |
78 | extern char *cmdopt[]; |
79 | #else |
80 | char *cmdopt[] = { |
81 | "FALSE", |
82 | "TRUE", |
83 | "REG", |
84 | "ANCHOR", |
85 | "STROP", |
86 | "SCAN", |
87 | "GETS", |
88 | "EVAL", |
89 | "UNFLIP", |
90 | "CHOP", |
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91 | "ARRAY", |
92 | "INDGETS", |
93 | "NUMOP", |
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94 | "CCLASS", |
95 | "14" |
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96 | }; |
97 | #endif |
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98 | #endif /* DEBUGGING */ |
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99 | |
100 | struct acmd { |
101 | STAB *ac_stab; /* a symbol table entry */ |
102 | ARG *ac_expr; /* any associated expression */ |
103 | }; |
104 | |
105 | struct ccmd { |
106 | CMD *cc_true; /* normal code to do on if and while */ |
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107 | CMD *cc_alt; /* else cmd ptr or continue code */ |
108 | }; |
109 | |
110 | struct scmd { |
111 | CMD **sc_next; /* array of pointers to commands */ |
112 | short sc_offset; /* first value - 1 */ |
113 | short sc_max; /* last value + 1 */ |
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114 | }; |
115 | |
116 | struct cmd { |
117 | CMD *c_next; /* the next command at this level */ |
118 | ARG *c_expr; /* conditional expression */ |
119 | CMD *c_head; /* head of this command list */ |
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120 | STR *c_short; /* string to match as shortcut */ |
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121 | STAB *c_stab; /* a symbol table entry, mostly for fp */ |
122 | SPAT *c_spat; /* pattern used by optimization */ |
123 | char *c_label; /* label for this construct */ |
124 | union ucmd { |
125 | struct acmd acmd; /* normal command */ |
126 | struct ccmd ccmd; /* compound command */ |
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127 | struct scmd scmd; /* switch command */ |
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128 | } ucmd; |
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129 | short c_slen; /* len of c_short, if not null */ |
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130 | short c_flags; /* optimization flags--see above */ |
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131 | char *c_file; /* file the following line # is from */ |
132 | line_t c_line; /* line # of this command */ |
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133 | char c_type; /* what this command does */ |
134 | }; |
135 | |
136 | #define Nullcmd Null(CMD*) |
137 | |
138 | EXT CMD *main_root INIT(Nullcmd); |
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139 | EXT CMD *eval_root INIT(Nullcmd); |
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140 | |
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141 | struct compcmd { |
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142 | CMD *comp_true; |
143 | CMD *comp_alt; |
144 | }; |
145 | |
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146 | void opt_arg(); |
147 | void evalstatic(); |
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148 | int cmd_exec(); |