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   1 /*
   2  * Copyright © 2016 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include "ao_scheme.h"
  16
  17 static inline int
  18 frame_vals_num_size(int num)
  19 {
  20         return sizeof (struct ao_scheme_frame_vals) + num * sizeof (struct ao_scheme_val);
  21 }
  22
  23 static int
  24 frame_vals_size(void *addr)
  25 {
  26         struct ao_scheme_frame_vals     *vals = addr;
  27         return frame_vals_num_size(vals->size);
  28 }
  29
  30 static void
  31 frame_vals_mark(void *addr)
  32 {
  33         struct ao_scheme_frame_vals     *vals = addr;
  34         int                             f;
  35
  36         for (f = 0; f < vals->size; f++) {
  37                 struct ao_scheme_val    *v = &vals->vals[f];
  38
  39                 ao_scheme_poly_mark(v->val, 0);
  40                 MDBG_MOVE("frame mark atom %s %d val %d at %d    ",
  41                           ao_scheme_poly_atom(v->atom)->name,
  42                           MDBG_OFFSET(ao_scheme_ref(v->atom)),
  43                           MDBG_OFFSET(ao_scheme_ref(v->val)), f);
  44                 MDBG_DO(printf("\n"));
  45         }
  46 }
  47
  48 static void
  49 frame_vals_move(void *addr)
  50 {
  51         struct ao_scheme_frame_vals     *vals = addr;
  52         int                             f;
  53
  54         for (f = 0; f < vals->size; f++) {
  55                 struct ao_scheme_val    *v = &vals->vals[f];
  56
  57                 ao_scheme_poly_move(&v->atom, 0);
  58                 ao_scheme_poly_move(&v->val, 0);
  59                 MDBG_MOVE("frame move atom %s %d val %d at %d\n",
  60                           ao_scheme_poly_atom(v->atom)->name,
  61                           MDBG_OFFSET(ao_scheme_ref(v->atom)),
  62                           MDBG_OFFSET(ao_scheme_ref(v->val)), f);
  63         }
  64 }
  65
  66 const struct ao_scheme_type ao_scheme_frame_vals_type = {
  67         .mark = frame_vals_mark,
  68         .size = frame_vals_size,
  69         .move = frame_vals_move,
  70         .name = "frame_vals"
  71 };
  72
  73 static int
  74 frame_size(void *addr)
  75 {
  76         (void) addr;
  77         return sizeof (struct ao_scheme_frame);
  78 }
  79
  80 static void
  81 frame_mark(void *addr)
  82 {
  83         struct ao_scheme_frame  *frame = addr;
  84
  85         for (;;) {
  86                 struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
  87
  88                 MDBG_MOVE("frame mark %d\n", MDBG_OFFSET(frame));
  89                 if (!ao_scheme_mark_memory(&ao_scheme_frame_vals_type, vals))
  90                         frame_vals_mark(vals);
  91                 frame = ao_scheme_poly_frame(frame->prev);
  92                 MDBG_MOVE("frame next %d\n", MDBG_OFFSET(frame));
  93                 if (!frame)
  94                         break;
  95                 if (ao_scheme_mark_memory(&ao_scheme_frame_type, frame))
  96                         break;
  97         }
  98 }
  99
 100 static void
 101 frame_move(void *addr)
 102 {
 103         struct ao_scheme_frame  *frame = addr;
 104
 105         for (;;) {
 106                 struct ao_scheme_frame          *prev;
 107                 struct ao_scheme_frame_vals     *vals;
 108                 int                             ret;
 109
 110                 MDBG_MOVE("frame move %d\n", MDBG_OFFSET(frame));
 111                 vals = ao_scheme_poly_frame_vals(frame->vals);
 112                 if (!ao_scheme_move_memory(&ao_scheme_frame_vals_type, (void **) &vals))
 113                         frame_vals_move(vals);
 114                 if (vals != ao_scheme_poly_frame_vals(frame->vals))
 115                         frame->vals = ao_scheme_frame_vals_poly(vals);
 116
 117                 prev = ao_scheme_poly_frame(frame->prev);
 118                 if (!prev)
 119                         break;
 120                 ret = ao_scheme_move_memory(&ao_scheme_frame_type, (void **) &prev);
 121                 if (prev != ao_scheme_poly_frame(frame->prev)) {
 122                         MDBG_MOVE("frame prev moved from %d to %d\n",
 123                                   MDBG_OFFSET(ao_scheme_poly_frame(frame->prev)),
 124                                   MDBG_OFFSET(prev));
 125                         frame->prev = ao_scheme_frame_poly(prev);
 126                 }
 127                 if (ret)
 128                         break;
 129                 frame = prev;
 130         }
 131 }
 132
 133 const struct ao_scheme_type ao_scheme_frame_type = {
 134         .mark = frame_mark,
 135         .size = frame_size,
 136         .move = frame_move,
 137         .name = "frame",
 138 };
 139
 140 int ao_scheme_frame_print_indent;
 141
 142 static void
 143 ao_scheme_frame_indent(int extra)
 144 {
 145         int                             i;
 146         putchar('\n');
 147         for (i = 0; i < ao_scheme_frame_print_indent+extra; i++)
 148                 putchar('\t');
 149 }
 150
 151 void
 152 ao_scheme_frame_write(ao_poly p, bool write)
 153 {
 154         struct ao_scheme_frame          *frame = ao_scheme_poly_frame(p);
 155         struct ao_scheme_frame          *clear = frame;
 156         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 157         int                             f;
 158         int                             written = 0;
 159
 160         ao_scheme_print_start();
 161         while (frame) {
 162                 if (written != 0)
 163                         printf(", ");
 164                 if (ao_scheme_print_mark_addr(frame)) {
 165                         printf("recurse...");
 166                         break;
 167                 }
 168
 169                 putchar('{');
 170                 written++;
 171                 for (f = 0; f < frame->num; f++) {
 172                         ao_scheme_frame_indent(1);
 173                         ao_scheme_poly_write(vals->vals[f].atom, write);
 174                         printf(" = ");
 175                         ao_scheme_poly_write(vals->vals[f].val, write);
 176                 }
 177                 frame = ao_scheme_poly_frame(frame->prev);
 178                 ao_scheme_frame_indent(0);
 179                 putchar('}');
 180         }
 181         if (ao_scheme_print_stop()) {
 182                 while (written--) {
 183                         ao_scheme_print_clear_addr(clear);
 184                         clear = ao_scheme_poly_frame(clear->prev);
 185                 }
 186         }
 187 }
 188
 189 static int
 190 ao_scheme_frame_find(struct ao_scheme_frame *frame, int top, ao_poly atom)
 191 {
 192         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 193         int                             l = 0;
 194         int                             r = top - 1;
 195
 196         while (l <= r) {
 197                 int m = (l + r) >> 1;
 198                 if (vals->vals[m].atom < atom)
 199                         l = m + 1;
 200                 else
 201                         r = m - 1;
 202         }
 203         return l;
 204 }
 205
 206 ao_poly *
 207 ao_scheme_frame_ref(struct ao_scheme_frame *frame, ao_poly atom)
 208 {
 209         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 210         int                             l = ao_scheme_frame_find(frame, frame->num, atom);
 211
 212         if (l >= frame->num)
 213                 return NULL;
 214
 215         if (vals->vals[l].atom != atom)
 216                 return NULL;
 217         return &vals->vals[l].val;
 218 }
 219
 220 struct ao_scheme_frame  *ao_scheme_frame_free_list[AO_SCHEME_FRAME_FREE];
 221
 222 static struct ao_scheme_frame_vals *
 223 ao_scheme_frame_vals_new(int num)
 224 {
 225         struct ao_scheme_frame_vals     *vals;
 226
 227         vals = ao_scheme_alloc(frame_vals_num_size(num));
 228         if (!vals)
 229                 return NULL;
 230         vals->type = AO_SCHEME_FRAME_VALS;
 231         vals->size = num;
 232         memset(vals->vals, '\0', num * sizeof (struct ao_scheme_val));
 233         return vals;
 234 }
 235
 236 struct ao_scheme_frame *
 237 ao_scheme_frame_new(int num)
 238 {
 239         struct ao_scheme_frame          *frame;
 240         struct ao_scheme_frame_vals     *vals;
 241
 242         if (num < AO_SCHEME_FRAME_FREE && (frame = ao_scheme_frame_free_list[num])) {
 243                 ao_scheme_frame_free_list[num] = ao_scheme_poly_frame(frame->prev);
 244                 vals = ao_scheme_poly_frame_vals(frame->vals);
 245         } else {
 246                 frame = ao_scheme_alloc(sizeof (struct ao_scheme_frame));
 247                 if (!frame)
 248                         return NULL;
 249                 frame->type = AO_SCHEME_FRAME;
 250                 frame->num = 0;
 251                 frame->prev = AO_SCHEME_NIL;
 252                 frame->vals = AO_SCHEME_NIL;
 253                 ao_scheme_frame_stash(0, frame);
 254                 vals = ao_scheme_frame_vals_new(num);
 255                 frame = ao_scheme_frame_fetch(0);
 256                 if (!vals)
 257                         return NULL;
 258                 frame->vals = ao_scheme_frame_vals_poly(vals);
 259                 frame->num = num;
 260         }
 261         frame->prev = AO_SCHEME_NIL;
 262         return frame;
 263 }
 264
 265 ao_poly
 266 ao_scheme_frame_mark(struct ao_scheme_frame *frame)
 267 {
 268         if (!frame)
 269                 return AO_SCHEME_NIL;
 270         frame->type |= AO_SCHEME_FRAME_MARK;
 271         return ao_scheme_frame_poly(frame);
 272 }
 273
 274 void
 275 ao_scheme_frame_free(struct ao_scheme_frame *frame)
 276 {
 277         if (frame && !ao_scheme_frame_marked(frame)) {
 278                 int     num = frame->num;
 279                 if (num < AO_SCHEME_FRAME_FREE) {
 280                         struct ao_scheme_frame_vals     *vals;
 281
 282                         vals = ao_scheme_poly_frame_vals(frame->vals);
 283                         memset(vals->vals, '\0', vals->size * sizeof (struct ao_scheme_val));
 284                         frame->prev = ao_scheme_frame_poly(ao_scheme_frame_free_list[num]);
 285                         ao_scheme_frame_free_list[num] = frame;
 286                 }
 287         }
 288 }
 289
 290 static struct ao_scheme_frame *
 291 ao_scheme_frame_realloc(struct ao_scheme_frame *frame, int new_num)
 292 {
 293         struct ao_scheme_frame_vals     *vals;
 294         struct ao_scheme_frame_vals     *new_vals;
 295         int                             copy;
 296
 297         if (new_num == frame->num)
 298                 return frame;
 299         ao_scheme_frame_stash(0, frame);
 300         new_vals = ao_scheme_frame_vals_new(new_num);
 301         frame = ao_scheme_frame_fetch(0);
 302         if (!new_vals)
 303                 return NULL;
 304         vals = ao_scheme_poly_frame_vals(frame->vals);
 305         copy = new_num;
 306         if (copy > frame->num)
 307                 copy = frame->num;
 308         memcpy(new_vals->vals, vals->vals, copy * sizeof (struct ao_scheme_val));
 309         frame->vals = ao_scheme_frame_vals_poly(new_vals);
 310         frame->num = new_num;
 311         return frame;
 312 }
 313
 314 void
 315 ao_scheme_frame_bind(struct ao_scheme_frame *frame, int num, ao_poly atom, ao_poly val)
 316 {
 317         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 318         int                             l = ao_scheme_frame_find(frame, num, atom);
 319
 320         memmove(&vals->vals[l+1],
 321                 &vals->vals[l],
 322                 (num - l) * sizeof (struct ao_scheme_val));
 323         vals->vals[l].atom = atom;
 324         vals->vals[l].val = val;
 325 }
 326
 327 ao_poly
 328 ao_scheme_frame_add(struct ao_scheme_frame *frame, ao_poly atom, ao_poly val)
 329 {
 330         ao_poly *ref = frame ? ao_scheme_frame_ref(frame, atom) : NULL;
 331
 332         if (!ref) {
 333                 int f = frame->num;
 334                 ao_scheme_poly_stash(0, atom);
 335                 ao_scheme_poly_stash(1, val);
 336                 frame = ao_scheme_frame_realloc(frame, f + 1);
 337                 val = ao_scheme_poly_fetch(1);
 338                 atom = ao_scheme_poly_fetch(0);
 339                 if (!frame)
 340                         return AO_SCHEME_NIL;
 341                 ao_scheme_frame_bind(frame, frame->num - 1, atom, val);
 342         } else
 343                 *ref = val;
 344         return val;
 345 }
 346
 347 struct ao_scheme_frame  *ao_scheme_frame_global;
 348 struct ao_scheme_frame  *ao_scheme_frame_current;
 349
 350 void
 351 ao_scheme_frame_init(void)
 352 {
 353         if (!ao_scheme_frame_global)
 354                 ao_scheme_frame_global = ao_scheme_frame_new(0);
 355 }