| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | # |
| 3 | /* |
| 4 | * pi - Pascal interpreter code translator |
| 5 | * |
| 6 | * Charles Haley, Bill Joy UCB |
| 7 | * Version 1.2 January 1979 |
| 8 | */ |
| 9 | |
| 10 | #include "0.h" |
| 11 | #include "tree.h" |
| 12 | #include "opcode.h" |
| 13 | |
| 14 | /* |
| 15 | * Funccod generates code for |
| 16 | * built in function calls and calls |
| 17 | * call to generate calls to user |
| 18 | * defined functions and procedures. |
| 19 | */ |
| 20 | funccod(r) |
| 21 | int *r; |
| 22 | { |
| 23 | struct nl *p; |
| 24 | register struct nl *p1; |
| 25 | register int *al; |
| 26 | register op; |
| 27 | int argc, *argv; |
| 28 | int tr[2], tr2[4]; |
| 29 | |
| 30 | /* |
| 31 | * Verify that the given name |
| 32 | * is defined and the name of |
| 33 | * a function. |
| 34 | */ |
| 35 | p = lookup(r[2]); |
| 36 | if (p == NIL) { |
| 37 | rvlist(r[3]); |
| 38 | return (NIL); |
| 39 | } |
| 40 | if (p->class != FUNC) { |
| 41 | error("%s is not a function", p->symbol); |
| 42 | rvlist(r[3]); |
| 43 | return (NIL); |
| 44 | } |
| 45 | argv = r[3]; |
| 46 | /* |
| 47 | * Call handles user defined |
| 48 | * procedures and functions |
| 49 | */ |
| 50 | if (bn != 0) |
| 51 | return (call(p, argv, FUNC, bn)); |
| 52 | /* |
| 53 | * Count the arguments |
| 54 | */ |
| 55 | argc = 0; |
| 56 | for (al = argv; al != NIL; al = al[2]) |
| 57 | argc++; |
| 58 | /* |
| 59 | * Built-in functions have |
| 60 | * their interpreter opcode |
| 61 | * associated with them. |
| 62 | */ |
| 63 | op = p->value[0] &~ NSTAND; |
| 64 | if (opt('s') && (p->value[0] & NSTAND)) { |
| 65 | standard(); |
| 66 | error("%s is a nonstandard function", p->symbol); |
| 67 | } |
| 68 | switch (op) { |
| 69 | /* |
| 70 | * Parameterless functions |
| 71 | */ |
| 72 | case O_CLCK: |
| 73 | case O_SCLCK: |
| 74 | case O_WCLCK: |
| 75 | case O_ARGC: |
| 76 | if (argc != 0) { |
| 77 | error("%s takes no arguments", p->symbol); |
| 78 | rvlist(argv); |
| 79 | return (NIL); |
| 80 | } |
| 81 | put1(op); |
| 82 | return (nl+T4INT); |
| 83 | case O_EOF: |
| 84 | case O_EOLN: |
| 85 | if (argc == 0) { |
| 86 | argv = tr; |
| 87 | tr[1] = tr2; |
| 88 | tr2[0] = T_VAR; |
| 89 | tr2[2] = input->symbol; |
| 90 | tr2[1] = tr2[3] = NIL; |
| 91 | argc = 1; |
| 92 | } else if (argc != 1) { |
| 93 | error("%s takes either zero or one argument", p->symbol); |
| 94 | rvlist(argv); |
| 95 | return (NIL); |
| 96 | } |
| 97 | } |
| 98 | /* |
| 99 | * All other functions take |
| 100 | * exactly one argument. |
| 101 | */ |
| 102 | if (argc != 1) { |
| 103 | error("%s takes exactly one argument", p->symbol); |
| 104 | rvlist(argv); |
| 105 | return (NIL); |
| 106 | } |
| 107 | /* |
| 108 | * Evaluate the argmument |
| 109 | */ |
| 110 | p1 = rvalue(argv[1], NIL); |
| 111 | if (p1 == NIL) |
| 112 | return (NIL); |
| 113 | switch (op) { |
| 114 | case O_EXP: |
| 115 | case O_SIN: |
| 116 | case O_COS: |
| 117 | case O_ATAN: |
| 118 | case O_LN: |
| 119 | case O_SQRT: |
| 120 | case O_RANDOM: |
| 121 | case O_EXPO: |
| 122 | case O_UNDEF: |
| 123 | if (isa(p1, "i")) |
| 124 | convert(p1, nl+TDOUBLE); |
| 125 | else if (isnta(p1, "d")) { |
| 126 | error("%s's argument must be integer or real, not %s", p->symbol, nameof(p1)); |
| 127 | return (NIL); |
| 128 | } |
| 129 | put1(op); |
| 130 | if (op == O_UNDEF) |
| 131 | return (nl+TBOOL); |
| 132 | else if (op == O_EXPO) |
| 133 | return (nl+T4INT); |
| 134 | else |
| 135 | return (nl+TDOUBLE); |
| 136 | case O_SEED: |
| 137 | if (isnta(p1, "i")) { |
| 138 | error("seed's argument must be an integer, not %s", nameof(p1)); |
| 139 | return (NIL); |
| 140 | } |
| 141 | convert(p1, nl+T4INT); |
| 142 | put1(op); |
| 143 | return (nl+T4INT); |
| 144 | case O_ROUND: |
| 145 | case O_TRUNC: |
| 146 | if (isnta(p1, "d")) { |
| 147 | error("%s's argument must be a real, not %s", p->symbol, nameof(p1)); |
| 148 | return (NIL); |
| 149 | } |
| 150 | put1(op); |
| 151 | return (nl+T4INT); |
| 152 | case O_ABS2: |
| 153 | case O_SQR2: |
| 154 | if (isa(p1, "d")) { |
| 155 | put1(op + O_ABS8-O_ABS2); |
| 156 | return (nl+TDOUBLE); |
| 157 | } |
| 158 | if (isa(p1, "i")) { |
| 159 | put1(op + (width(p1) >> 2)); |
| 160 | return (nl+T4INT); |
| 161 | } |
| 162 | error("%s's argument must be an integer or real, not %s", p->symbol, nameof(p1)); |
| 163 | return (NIL); |
| 164 | case O_ORD2: |
| 165 | if (isa(p1, "bcis") || classify(p1) == TPTR) |
| 166 | switch (width(p1)) { |
| 167 | case 1: |
| 168 | return (nl+T1INT); |
| 169 | case 2: |
| 170 | return (nl+T2INT); |
| 171 | case 4: |
| 172 | return (nl+T4INT); |
| 173 | } |
| 174 | error("ord's argument must be of scalar type or a pointer, not %s", nameof(p1)); |
| 175 | return (NIL); |
| 176 | case O_SUCC2: |
| 177 | case O_PRED2: |
| 178 | if (isa(p1, "bcs")) { |
| 179 | put1(op); |
| 180 | return (p1); |
| 181 | } |
| 182 | if (isa(p1, "i")) { |
| 183 | if (width(p1) <= 2) |
| 184 | op =+ O_PRED24-O_PRED2; |
| 185 | else |
| 186 | op++; |
| 187 | put1(op); |
| 188 | return (nl+T4INT); |
| 189 | } |
| 190 | if (isa(p1, "id")) { |
| 191 | error("%s is forbidden for reals", p->symbol); |
| 192 | return (NIL); |
| 193 | } |
| 194 | error("%s's argument must be of scalar type, not %s", p->symbol, nameof(p1)); |
| 195 | return (NIL); |
| 196 | case O_ODD2: |
| 197 | if (isnta(p1, "i")) { |
| 198 | error("odd's argument must be an integer, not %s", nameof(p1)); |
| 199 | return (NIL); |
| 200 | } |
| 201 | put1(op + (width(p1) >> 2)); |
| 202 | return (nl+TBOOL); |
| 203 | case O_CHR2: |
| 204 | if (isnta(p1, "i")) { |
| 205 | error("chr's argument must be an integer, not %s", nameof(p1)); |
| 206 | return (NIL); |
| 207 | } |
| 208 | put1(op + (width(p1) >> 2)); |
| 209 | return (nl+TCHAR); |
| 210 | case O_CARD: |
| 211 | if (isnta(p1, "t")) { |
| 212 | error("Argument to card must be a set, not %s", nameof(p1)); |
| 213 | return (NIL); |
| 214 | } |
| 215 | put2(O_CARD, width(p1)); |
| 216 | return (nl+T2INT); |
| 217 | case O_EOLN: |
| 218 | if (!text(p1)) { |
| 219 | error("Argument to eoln must be a text file, not %s", nameof(p1)); |
| 220 | return (NIL); |
| 221 | } |
| 222 | put1(op); |
| 223 | return (nl+TBOOL); |
| 224 | case O_EOF: |
| 225 | if (p1->class != FILE) { |
| 226 | error("Argument to eof must be file, not %s", nameof(p1)); |
| 227 | return (NIL); |
| 228 | } |
| 229 | put1(op); |
| 230 | return (nl+TBOOL); |
| 231 | case 0: |
| 232 | error("%s is an unimplemented 6000-3.4 extension", p->symbol); |
| 233 | default: |
| 234 | panic("func1"); |
| 235 | } |
| 236 | } |