Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 1 | /* Integer object implementation */ |
| 2 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 3 | #include "allobjects.h" |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 4 | |
| 5 | /* Standard Booleans */ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 6 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 7 | intobject FalseObject = { |
| 8 | OB_HEAD_INIT(&Inttype) |
| 9 | 0 |
| 10 | }; |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 11 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 12 | intobject TrueObject = { |
| 13 | OB_HEAD_INIT(&Inttype) |
| 14 | 1 |
| 15 | }; |
| 16 | |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 17 | static object * |
| 18 | err_ovf() |
| 19 | { |
Guido van Rossum | 5c52b6a | 1990-10-21 22:11:03 +0000 | [diff] [blame] | 20 | err_setstr(OverflowError, "integer overflow"); |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 21 | return NULL; |
| 22 | } |
| 23 | |
| 24 | static object * |
| 25 | err_zdiv() |
| 26 | { |
Guido van Rossum | 5c52b6a | 1990-10-21 22:11:03 +0000 | [diff] [blame] | 27 | err_setstr(ZeroDivisionError, "integer division by zero"); |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 28 | return NULL; |
| 29 | } |
| 30 | |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 31 | /* Integers are quite normal objects, to make object handling uniform. |
| 32 | (Using odd pointers to represent integers would save much space |
| 33 | but require extra checks for this special case throughout the code.) |
| 34 | Since, a typical Python program spends much of its time allocating |
| 35 | and deallocating integers, these operations should be very fast. |
| 36 | Therefore we use a dedicated allocation scheme with a much lower |
| 37 | overhead (in space and time) than straight malloc(): a simple |
| 38 | dedicated free list, filled when necessary with memory from malloc(). |
| 39 | */ |
| 40 | |
| 41 | #define BLOCK_SIZE 1000 /* 1K less typical malloc overhead */ |
| 42 | #define N_INTOBJECTS (BLOCK_SIZE / sizeof(intobject)) |
| 43 | |
| 44 | static intobject * |
| 45 | fill_free_list() |
| 46 | { |
| 47 | intobject *p, *q; |
| 48 | p = NEW(intobject, N_INTOBJECTS); |
| 49 | if (p == NULL) |
| 50 | return (intobject *)err_nomem(); |
| 51 | q = p + N_INTOBJECTS; |
| 52 | while (--q > p) |
| 53 | *(intobject **)q = q-1; |
| 54 | *(intobject **)q = NULL; |
| 55 | return p + N_INTOBJECTS - 1; |
| 56 | } |
| 57 | |
| 58 | static intobject *free_list = NULL; |
| 59 | |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 60 | object * |
| 61 | newintobject(ival) |
| 62 | long ival; |
| 63 | { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 64 | register intobject *v; |
| 65 | if (free_list == NULL) { |
| 66 | if ((free_list = fill_free_list()) == NULL) |
| 67 | return NULL; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 68 | } |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 69 | v = free_list; |
| 70 | free_list = *(intobject **)free_list; |
| 71 | NEWREF(v); |
| 72 | v->ob_type = &Inttype; |
| 73 | v->ob_ival = ival; |
| 74 | return (object *) v; |
| 75 | } |
| 76 | |
| 77 | static void |
| 78 | int_dealloc(v) |
| 79 | intobject *v; |
| 80 | { |
| 81 | *(intobject **)v = free_list; |
| 82 | free_list = v; |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | long |
| 86 | getintvalue(op) |
| 87 | register object *op; |
| 88 | { |
| 89 | if (!is_intobject(op)) { |
Guido van Rossum | 5c52b6a | 1990-10-21 22:11:03 +0000 | [diff] [blame] | 90 | err_badcall(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 91 | return -1; |
| 92 | } |
| 93 | else |
| 94 | return ((intobject *)op) -> ob_ival; |
| 95 | } |
| 96 | |
| 97 | /* Methods */ |
| 98 | |
| 99 | static void |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 100 | int_print(v, fp, flags) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 101 | intobject *v; |
| 102 | FILE *fp; |
| 103 | int flags; |
| 104 | { |
| 105 | fprintf(fp, "%ld", v->ob_ival); |
| 106 | } |
| 107 | |
| 108 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 109 | int_repr(v) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 110 | intobject *v; |
| 111 | { |
| 112 | char buf[20]; |
| 113 | sprintf(buf, "%ld", v->ob_ival); |
| 114 | return newstringobject(buf); |
| 115 | } |
| 116 | |
| 117 | static int |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 118 | int_compare(v, w) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 119 | intobject *v, *w; |
| 120 | { |
| 121 | register long i = v->ob_ival; |
| 122 | register long j = w->ob_ival; |
| 123 | return (i < j) ? -1 : (i > j) ? 1 : 0; |
| 124 | } |
| 125 | |
| 126 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 127 | int_add(v, w) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 128 | intobject *v; |
| 129 | register object *w; |
| 130 | { |
| 131 | register long a, b, x; |
| 132 | if (!is_intobject(w)) { |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 133 | err_badarg(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 134 | return NULL; |
| 135 | } |
| 136 | a = v->ob_ival; |
| 137 | b = ((intobject *)w) -> ob_ival; |
| 138 | x = a + b; |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 139 | if ((x^a) < 0 && (x^b) < 0) |
| 140 | return err_ovf(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 141 | return newintobject(x); |
| 142 | } |
| 143 | |
| 144 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 145 | int_sub(v, w) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 146 | intobject *v; |
| 147 | register object *w; |
| 148 | { |
| 149 | register long a, b, x; |
| 150 | if (!is_intobject(w)) { |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 151 | err_badarg(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 152 | return NULL; |
| 153 | } |
| 154 | a = v->ob_ival; |
| 155 | b = ((intobject *)w) -> ob_ival; |
| 156 | x = a - b; |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 157 | if ((x^a) < 0 && (x^~b) < 0) |
| 158 | return err_ovf(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 159 | return newintobject(x); |
| 160 | } |
| 161 | |
| 162 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 163 | int_mul(v, w) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 164 | intobject *v; |
| 165 | register object *w; |
| 166 | { |
| 167 | register long a, b; |
| 168 | double x; |
| 169 | if (!is_intobject(w)) { |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 170 | err_badarg(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 171 | return NULL; |
| 172 | } |
| 173 | a = v->ob_ival; |
| 174 | b = ((intobject *)w) -> ob_ival; |
| 175 | x = (double)a * (double)b; |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 176 | if (x > 0x7fffffff || x < (double) (long) 0x80000000) |
| 177 | return err_ovf(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 178 | return newintobject(a * b); |
| 179 | } |
| 180 | |
| 181 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 182 | int_div(v, w) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 183 | intobject *v; |
| 184 | register object *w; |
| 185 | { |
| 186 | if (!is_intobject(w)) { |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 187 | err_badarg(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 188 | return NULL; |
| 189 | } |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 190 | if (((intobject *)w) -> ob_ival == 0) |
Guido van Rossum | abbda16 | 1990-10-26 14:58:41 +0000 | [diff] [blame] | 191 | return err_zdiv(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 192 | return newintobject(v->ob_ival / ((intobject *)w) -> ob_ival); |
| 193 | } |
| 194 | |
| 195 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 196 | int_rem(v, w) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 197 | intobject *v; |
| 198 | register object *w; |
| 199 | { |
| 200 | if (!is_intobject(w)) { |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 201 | err_badarg(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 202 | return NULL; |
| 203 | } |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 204 | if (((intobject *)w) -> ob_ival == 0) |
Guido van Rossum | abbda16 | 1990-10-26 14:58:41 +0000 | [diff] [blame] | 205 | return err_zdiv(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 206 | return newintobject(v->ob_ival % ((intobject *)w) -> ob_ival); |
| 207 | } |
| 208 | |
| 209 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 210 | int_pow(v, w) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 211 | intobject *v; |
| 212 | register object *w; |
| 213 | { |
| 214 | register long iv, iw, ix; |
| 215 | register int neg; |
| 216 | if (!is_intobject(w)) { |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 217 | err_badarg(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 218 | return NULL; |
| 219 | } |
| 220 | iv = v->ob_ival; |
| 221 | iw = ((intobject *)w)->ob_ival; |
| 222 | neg = 0; |
| 223 | if (iw < 0) |
| 224 | neg = 1, iw = -iw; |
| 225 | ix = 1; |
| 226 | for (; iw > 0; iw--) |
| 227 | ix = ix * iv; |
| 228 | if (neg) { |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 229 | if (ix == 0) |
Guido van Rossum | abbda16 | 1990-10-26 14:58:41 +0000 | [diff] [blame] | 230 | return err_zdiv(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 231 | ix = 1/ix; |
| 232 | } |
| 233 | /* XXX How to check for overflow? */ |
| 234 | return newintobject(ix); |
| 235 | } |
| 236 | |
| 237 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 238 | int_neg(v) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 239 | intobject *v; |
| 240 | { |
| 241 | register long a, x; |
| 242 | a = v->ob_ival; |
| 243 | x = -a; |
Guido van Rossum | 165e67e | 1990-10-14 20:02:26 +0000 | [diff] [blame] | 244 | if (a < 0 && x < 0) |
| 245 | return err_ovf(); |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 246 | return newintobject(x); |
| 247 | } |
| 248 | |
| 249 | static object * |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 250 | int_pos(v) |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 251 | intobject *v; |
| 252 | { |
| 253 | INCREF(v); |
| 254 | return (object *)v; |
| 255 | } |
| 256 | |
| 257 | static number_methods int_as_number = { |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 258 | int_add, /*tp_add*/ |
| 259 | int_sub, /*tp_subtract*/ |
| 260 | int_mul, /*tp_multiply*/ |
| 261 | int_div, /*tp_divide*/ |
| 262 | int_rem, /*tp_remainder*/ |
| 263 | int_pow, /*tp_power*/ |
| 264 | int_neg, /*tp_negate*/ |
| 265 | int_pos, /*tp_plus*/ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 266 | }; |
| 267 | |
| 268 | typeobject Inttype = { |
| 269 | OB_HEAD_INIT(&Typetype) |
| 270 | 0, |
| 271 | "int", |
| 272 | sizeof(intobject), |
| 273 | 0, |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 274 | int_dealloc, /*tp_dealloc*/ |
| 275 | int_print, /*tp_print*/ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 276 | 0, /*tp_getattr*/ |
| 277 | 0, /*tp_setattr*/ |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame^] | 278 | int_compare, /*tp_compare*/ |
| 279 | int_repr, /*tp_repr*/ |
Guido van Rossum | 85a5fbb | 1990-10-14 12:07:46 +0000 | [diff] [blame] | 280 | &int_as_number, /*tp_as_number*/ |
| 281 | 0, /*tp_as_sequence*/ |
| 282 | 0, /*tp_as_mapping*/ |
| 283 | }; |