projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 3dfd7536 ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
| 2 | ||
| 3 | static char sccsid[] = "@(#)attributes.c 1.1 %G%"; | |
| 4 | ||
| 5 | /* | |
| 6 | * Functions to return the attributes of a symbol. | |
| 7 | */ | |
| 8 | ||
| 9 | #include "defs.h" | |
| 10 | #include "sym.h" | |
| 11 | #include "process.h" | |
| 12 | #include "btypes.h" | |
| 13 | #include "classes.h" | |
| 14 | #include "sym.rep" | |
| 15 | ||
| 16 | char *name(s) | |
| 17 | SYM *s; | |
| 18 | { | |
| 19 | return s->symbol; | |
| 20 | } | |
| 21 | ||
| 22 | int toknum(s) | |
| 23 | SYM *s; | |
| 24 | { | |
| 25 | return s->symvalue.token.toknum; | |
| 26 | } | |
| 27 | ||
| 28 | int tokval(s) | |
| 29 | SYM *s; | |
| 30 | { | |
| 31 | return s->symvalue.token.tokval; | |
| 32 | } | |
| 33 | ||
| 34 | ADDRESS codeloc(f) | |
| 35 | SYM *f; | |
| 36 | { | |
| 37 | if (f == NIL) { | |
| 38 | panic("codeloc: nil symbol"); | |
| 39 | } | |
| 40 | if (!isblock(f)) { | |
| 41 | panic("codeloc: %s is not a block", f->symbol); | |
| 42 | } | |
| 43 | return f->symvalue.funcv.codeloc; | |
| 44 | } | |
| 45 | ||
| 46 | /* | |
| 47 | * Rtype returns the "reduced type" given a variable. | |
| 48 | * The idea is to remove type names so we can check the class. | |
| 49 | */ | |
| 50 | ||
| 51 | SYM *rtype(t) | |
| 52 | register SYM *t; | |
| 53 | { | |
| 54 | while (t->class == TYPE) { | |
| 55 | t = t->type; | |
| 56 | } | |
| 57 | return t; | |
| 58 | } | |
| 59 | ||
| 60 | /* | |
| 61 | * Return the SYM that contains the given SYM. | |
| 62 | */ | |
| 63 | ||
| 64 | SYM *container(s) | |
| 65 | SYM *s; | |
| 66 | { | |
| 67 | return s->func; | |
| 68 | } | |
| 69 | ||
| 70 | /* | |
| 71 | * Return a pointer to the string for the name of the class that | |
| 72 | * the given symbol belongs to. | |
| 73 | */ | |
| 74 | ||
| 75 | LOCAL char *clname[] = { | |
| 76 | "bad use", "constant", "type", "variable", "array", "fileptr", | |
| 77 | "record", "field", "procedure", "function", "funcvar", | |
| 78 | "ref", "pointer", "file", "set", "range", "label", "withptr", | |
| 79 | "scalar", "string", "program", "improper", "variant", | |
| 80 | "procparam", "funcparam", | |
| 81 | }; | |
| 82 | ||
| 83 | char *classname(s) | |
| 84 | SYM *s; | |
| 85 | { | |
| 86 | return clname[s->class]; | |
| 87 | } | |
| 88 | ||
| 89 | /* | |
| 90 | * size finds the size in bytes of the given type | |
| 91 | */ | |
| 92 | ||
| 93 | #define MINCHAR -128 | |
| 94 | #define MAXCHAR 127 | |
| 95 | #define MINSHORT -32768 | |
| 96 | #define MAXSHORT 32767 | |
| 97 | ||
| 98 | int size(t) | |
| 99 | register SYM *t; | |
| 100 | { | |
| 101 | long lower, upper; | |
| 102 | ||
| 103 | t = rtype(t); | |
| 104 | if (t == t_real) { | |
| 105 | return sizeof(double); | |
| 106 | } | |
| 107 | switch(t->class) { | |
| 108 | case RANGE: | |
| 109 | lower = t->symvalue.rangev.lower; | |
| 110 | upper = t->symvalue.rangev.upper; | |
| 111 | if (lower >= MINCHAR && upper <= MAXCHAR) { | |
| 112 | return sizeof(char); | |
| 113 | } else if (lower >= MINSHORT && upper <= MAXSHORT) { | |
| 114 | return sizeof(short); | |
| 115 | } else { | |
| 116 | return sizeof(long); | |
| 117 | } | |
| 118 | /* NOTREACHED */ | |
| 119 | ||
| 120 | case ARRAY: { | |
| 121 | register int nel, elsize; | |
| 122 | register SYM *s; | |
| 123 | ||
| 124 | elsize = size(t->type); | |
| 125 | nel = 1; | |
| 126 | for (t = t->chain; t != NIL; t = t->chain) { | |
| 127 | s = rtype(t); | |
| 128 | lower = s->symvalue.rangev.lower; | |
| 129 | upper = s->symvalue.rangev.upper; | |
| 130 | nel *= (upper-lower+1); | |
| 131 | } | |
| 132 | return nel*elsize; | |
| 133 | } | |
| 134 | ||
| 135 | case CONST: | |
| 136 | case VAR: | |
| 137 | case FVAR: | |
| 138 | case FIELD: | |
| 139 | return size(t->type); | |
| 140 | ||
| 141 | case RECORD: | |
| 142 | return t->symvalue.offset; | |
| 143 | ||
| 144 | case PTR: | |
| 145 | case REF: | |
| 146 | case FILET: | |
| 147 | return sizeof(int); | |
| 148 | ||
| 149 | case SCAL: | |
| 150 | if (t->symvalue.iconval > 255) { | |
| 151 | return sizeof(short); | |
| 152 | } else { | |
| 153 | return sizeof(char); | |
| 154 | } | |
| 155 | /* NOTREACHED */ | |
| 156 | ||
| 157 | case FPROC: | |
| 158 | case FFUNC: | |
| 159 | return sizeof(ADDRESS *); | |
| 160 | ||
| 161 | default: | |
| 162 | if (t->class < BADUSE || t->class > FFUNC) { | |
| 163 | panic("size: bad class (%d)", t->class); | |
| 164 | } else { | |
| 165 | error("improper operation on a %s", classname(t)); | |
| 166 | } | |
| 167 | /* NOTREACHED */ | |
| 168 | } | |
| 169 | } |