1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
|
/* Copyright (C) 2001-2012 Artifex Software, Inc.
All Rights Reserved.
This software is provided AS-IS with no warranty, either express or
implied.
This software is distributed under license and may not be copied,
modified or distributed except as expressly authorized under the terms
of the license contained in the file LICENSE in this distribution.
Refer to licensing information at http://www.artifex.com or contact
Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, San Rafael,
CA 94903, U.S.A., +1(415)492-9861, for further information.
*/
/* Arithmetic operators */
#include "math_.h"
#include "ghost.h"
#include "oper.h"
#include "store.h"
/****** NOTE: none of the arithmetic operators ******/
/****** currently check for floating exceptions ******/
/*
* Many of the procedures in this file are public only so they can be
* called from the FunctionType 4 interpreter (zfunc4.c).
*/
/* Define max and min values for what will fit in value.intval. */
#define MIN_INTVAL 0x80000000
#define MAX_INTVAL 0x7fffffff
/* <num1> <num2> add <sum> */
/* We make this into a separate procedure because */
/* the interpreter will almost always call it directly. */
int
zop_add(register os_ptr op)
{
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
switch (r_type(op - 1)) {
default:
return_op_typecheck(op - 1);
case t_real:
op[-1].value.realval += op->value.realval;
break;
case t_integer:
make_real(op - 1, (double)op[-1].value.intval + op->value.realval);
}
break;
case t_integer:
switch (r_type(op - 1)) {
default:
return_op_typecheck(op - 1);
case t_real:
op[-1].value.realval += (double)op->value.intval;
break;
case t_integer: {
int int2 = op->value.intval;
if (((op[-1].value.intval += int2) ^ int2) < 0 &&
((op[-1].value.intval - int2) ^ int2) >= 0
) { /* Overflow, convert to real */
make_real(op - 1, (double)(op[-1].value.intval - int2) + int2);
}
}
}
}
return 0;
}
int
zadd(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
int code = zop_add(op);
if (code == 0) {
pop(1);
}
return code;
}
/* <num1> <num2> div <real_quotient> */
int
zdiv(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
os_ptr op1 = op - 1;
/* We can't use the non_int_cases macro, */
/* because we have to check explicitly for op == 0. */
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
if (op->value.realval == 0)
return_error(e_undefinedresult);
switch (r_type(op1)) {
default:
return_op_typecheck(op1);
case t_real:
op1->value.realval /= op->value.realval;
break;
case t_integer:
make_real(op1, (double)op1->value.intval / op->value.realval);
}
break;
case t_integer:
if (op->value.intval == 0)
return_error(e_undefinedresult);
switch (r_type(op1)) {
default:
return_op_typecheck(op1);
case t_real:
op1->value.realval /= (double)op->value.intval;
break;
case t_integer:
make_real(op1, (double)op1->value.intval / (double)op->value.intval);
}
}
pop(1);
return 0;
}
/* <num1> <num2> mul <product> */
int
zmul(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
switch (r_type(op - 1)) {
default:
return_op_typecheck(op - 1);
case t_real:
op[-1].value.realval *= op->value.realval;
break;
case t_integer:
make_real(op - 1, (double)op[-1].value.intval * op->value.realval);
}
break;
case t_integer:
switch (r_type(op - 1)) {
default:
return_op_typecheck(op - 1);
case t_real:
op[-1].value.realval *= (double)op->value.intval;
break;
case t_integer: {
double ab = (double)op[-1].value.intval * op->value.intval;
if (ab > 2147483647.) /* (double)0x7fffffff */
make_real(op - 1, ab);
else if (ab < -2147483648.) /* (double)(int)0x80000000 */
make_real(op - 1, ab);
else
op[-1].value.intval = (int)ab;
}
}
}
pop(1);
return 0;
}
/* <num1> <num2> sub <difference> */
/* We make this into a separate procedure because */
/* the interpreter will almost always call it directly. */
int
zop_sub(register os_ptr op)
{
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
switch (r_type(op - 1)) {
default:
return_op_typecheck(op - 1);
case t_real:
op[-1].value.realval -= op->value.realval;
break;
case t_integer:
make_real(op - 1, (double)op[-1].value.intval - op->value.realval);
}
break;
case t_integer:
switch (r_type(op - 1)) {
default:
return_op_typecheck(op - 1);
case t_real:
op[-1].value.realval -= (double)op->value.intval;
break;
case t_integer: {
int int1 = op[-1].value.intval;
if ((int1 ^ (op[-1].value.intval = int1 - op->value.intval)) < 0 &&
(int1 ^ op->value.intval) < 0
) { /* Overflow, convert to real */
make_real(op - 1, (float)int1 - op->value.intval);
}
}
}
}
return 0;
}
int
zsub(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
int code = zop_sub(op);
if (code == 0) {
pop(1);
}
return code;
}
/* <num1> <num2> idiv <int_quotient> */
int
zidiv(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
check_type(*op, t_integer);
check_type(op[-1], t_integer);
if ((op->value.intval == 0) || (op[-1].value.intval == MIN_INTVAL && op->value.intval == -1)) {
/* Anomalous boundary case: -MININT / -1, fail. */
return_error(e_undefinedresult);
}
op[-1].value.intval /= op->value.intval;
pop(1);
return 0;
}
/* <int1> <int2> mod <remainder> */
int
zmod(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
check_type(*op, t_integer);
check_type(op[-1], t_integer);
if (op->value.intval == 0)
return_error(e_undefinedresult);
op[-1].value.intval %= op->value.intval;
pop(1);
return 0;
}
/* <num1> neg <num2> */
int
zneg(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
op->value.realval = -op->value.realval;
break;
case t_integer:
if (op->value.intval == MIN_INTVAL)
make_real(op, -(float)MIN_INTVAL);
else
op->value.intval = -op->value.intval;
}
return 0;
}
/* <num1> abs <num2> */
int
zabs(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
if (op->value.realval >= 0)
return 0;
break;
case t_integer:
if (op->value.intval >= 0)
return 0;
break;
}
return zneg(i_ctx_p);
}
/* <num1> ceiling <num2> */
int
zceiling(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
op->value.realval = ceil(op->value.realval);
case t_integer:;
}
return 0;
}
/* <num1> floor <num2> */
int
zfloor(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
op->value.realval = floor(op->value.realval);
case t_integer:;
}
return 0;
}
/* <num1> round <num2> */
int
zround(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
op->value.realval = floor(op->value.realval + 0.5);
case t_integer:;
}
return 0;
}
/* <num1> truncate <num2> */
int
ztruncate(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
switch (r_type(op)) {
default:
return_op_typecheck(op);
case t_real:
op->value.realval =
(op->value.realval < 0.0 ?
ceil(op->value.realval) :
floor(op->value.realval));
case t_integer:;
}
return 0;
}
/* Non-standard operators */
/* <int1> <int2> .bitadd <sum> */
static int
zbitadd(i_ctx_t *i_ctx_p)
{
os_ptr op = osp;
check_type(*op, t_integer);
check_type(op[-1], t_integer);
op[-1].value.intval += op->value.intval;
pop(1);
return 0;
}
/* ------ Initialization table ------ */
const op_def zarith_op_defs[] =
{
{"1abs", zabs},
{"2add", zadd},
{"2.bitadd", zbitadd},
{"1ceiling", zceiling},
{"2div", zdiv},
{"2idiv", zidiv},
{"1floor", zfloor},
{"2mod", zmod},
{"2mul", zmul},
{"1neg", zneg},
{"1round", zround},
{"2sub", zsub},
{"1truncate", ztruncate},
op_def_end(0)
};
|
