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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_IS_POOL(frame))
  90                         break;
  91                 if (!ao_scheme_mark_memory(&ao_scheme_frame_vals_type, vals))
  92                         frame_vals_mark(vals);
  93                 frame = ao_scheme_poly_frame(frame->prev);
  94                 MDBG_MOVE("frame next %d\n", MDBG_OFFSET(frame));
  95                 if (!frame)
  96                         break;
  97                 if (ao_scheme_mark_memory(&ao_scheme_frame_type, frame))
  98                         break;
  99         }
 100 }
 101
 102 static void
 103 frame_move(void *addr)
 104 {
 105         struct ao_scheme_frame  *frame = addr;
 106
 107         for (;;) {
 108                 struct ao_scheme_frame          *prev;
 109                 struct ao_scheme_frame_vals     *vals;
 110                 int                             ret;
 111
 112                 MDBG_MOVE("frame move %d\n", MDBG_OFFSET(frame));
 113                 if (!AO_SCHEME_IS_POOL(frame))
 114                         break;
 115
 116                 vals = ao_scheme_poly_frame_vals(frame->vals);
 117                 if (!ao_scheme_move_memory(&ao_scheme_frame_vals_type, (void **) &vals))
 118                         frame_vals_move(vals);
 119                 if (vals != ao_scheme_poly_frame_vals(frame->vals))
 120                         frame->vals = ao_scheme_frame_vals_poly(vals);
 121
 122                 prev = ao_scheme_poly_frame(frame->prev);
 123                 if (!prev)
 124                         break;
 125                 ret = ao_scheme_move_memory(&ao_scheme_frame_type, (void **) &prev);
 126                 if (prev != ao_scheme_poly_frame(frame->prev)) {
 127                         MDBG_MOVE("frame prev moved from %d to %d\n",
 128                                   MDBG_OFFSET(ao_scheme_poly_frame(frame->prev)),
 129                                   MDBG_OFFSET(prev));
 130                         frame->prev = ao_scheme_frame_poly(prev);
 131                 }
 132                 if (ret)
 133                         break;
 134                 frame = prev;
 135         }
 136 }
 137
 138 const struct ao_scheme_type ao_scheme_frame_type = {
 139         .mark = frame_mark,
 140         .size = frame_size,
 141         .move = frame_move,
 142         .name = "frame",
 143 };
 144
 145 void
 146 ao_scheme_frame_write(ao_poly p)
 147 {
 148         struct ao_scheme_frame          *frame = ao_scheme_poly_frame(p);
 149         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 150         int                             f;
 151
 152         printf ("{");
 153         if (frame) {
 154                 if (frame->type & AO_SCHEME_FRAME_PRINT)
 155                         printf("recurse...");
 156                 else {
 157                         frame->type |= AO_SCHEME_FRAME_PRINT;
 158                         for (f = 0; f < frame->num; f++) {
 159                                 if (f != 0)
 160                                         printf(", ");
 161                                 ao_scheme_poly_write(vals->vals[f].atom);
 162                                 printf(" = ");
 163                                 ao_scheme_poly_write(vals->vals[f].val);
 164                         }
 165                         if (frame->prev)
 166                                 ao_scheme_poly_write(frame->prev);
 167                         frame->type &= ~AO_SCHEME_FRAME_PRINT;
 168                 }
 169         }
 170         printf("}");
 171 }
 172
 173 static int
 174 ao_scheme_frame_find(struct ao_scheme_frame *frame, int top, ao_poly atom)
 175 {
 176         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 177         int                             l = 0;
 178         int                             r = top - 1;
 179
 180         while (l <= r) {
 181                 int m = (l + r) >> 1;
 182                 if (vals->vals[m].atom < atom)
 183                         l = m + 1;
 184                 else
 185                         r = m - 1;
 186         }
 187         return l;
 188 }
 189
 190 ao_poly *
 191 ao_scheme_frame_ref(struct ao_scheme_frame *frame, ao_poly atom)
 192 {
 193         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 194         int                             l = ao_scheme_frame_find(frame, frame->num, atom);
 195
 196         if (l >= frame->num)
 197                 return NULL;
 198
 199         if (vals->vals[l].atom != atom)
 200                 return NULL;
 201         return &vals->vals[l].val;
 202 }
 203
 204 struct ao_scheme_frame  *ao_scheme_frame_free_list[AO_SCHEME_FRAME_FREE];
 205
 206 static struct ao_scheme_frame_vals *
 207 ao_scheme_frame_vals_new(int num)
 208 {
 209         struct ao_scheme_frame_vals     *vals;
 210
 211         vals = ao_scheme_alloc(frame_vals_num_size(num));
 212         if (!vals)
 213                 return NULL;
 214         vals->type = AO_SCHEME_FRAME_VALS;
 215         vals->size = num;
 216         memset(vals->vals, '\0', num * sizeof (struct ao_scheme_val));
 217         return vals;
 218 }
 219
 220 struct ao_scheme_frame *
 221 ao_scheme_frame_new(int num)
 222 {
 223         struct ao_scheme_frame          *frame;
 224         struct ao_scheme_frame_vals     *vals;
 225
 226         if (num < AO_SCHEME_FRAME_FREE && (frame = ao_scheme_frame_free_list[num])) {
 227                 ao_scheme_frame_free_list[num] = ao_scheme_poly_frame(frame->prev);
 228                 vals = ao_scheme_poly_frame_vals(frame->vals);
 229         } else {
 230                 frame = ao_scheme_alloc(sizeof (struct ao_scheme_frame));
 231                 if (!frame)
 232                         return NULL;
 233                 frame->type = AO_SCHEME_FRAME;
 234                 frame->num = 0;
 235                 frame->prev = AO_SCHEME_NIL;
 236                 frame->vals = AO_SCHEME_NIL;
 237                 ao_scheme_frame_stash(0, frame);
 238                 vals = ao_scheme_frame_vals_new(num);
 239                 frame = ao_scheme_frame_fetch(0);
 240                 if (!vals)
 241                         return NULL;
 242                 frame->vals = ao_scheme_frame_vals_poly(vals);
 243                 frame->num = num;
 244         }
 245         frame->prev = AO_SCHEME_NIL;
 246         return frame;
 247 }
 248
 249 ao_poly
 250 ao_scheme_frame_mark(struct ao_scheme_frame *frame)
 251 {
 252         if (!frame)
 253                 return AO_SCHEME_NIL;
 254         frame->type |= AO_SCHEME_FRAME_MARK;
 255         return ao_scheme_frame_poly(frame);
 256 }
 257
 258 void
 259 ao_scheme_frame_free(struct ao_scheme_frame *frame)
 260 {
 261         if (frame && !ao_scheme_frame_marked(frame)) {
 262                 int     num = frame->num;
 263                 if (num < AO_SCHEME_FRAME_FREE) {
 264                         struct ao_scheme_frame_vals     *vals;
 265
 266                         vals = ao_scheme_poly_frame_vals(frame->vals);
 267                         memset(vals->vals, '\0', vals->size * sizeof (struct ao_scheme_val));
 268                         frame->prev = ao_scheme_frame_poly(ao_scheme_frame_free_list[num]);
 269                         ao_scheme_frame_free_list[num] = frame;
 270                 }
 271         }
 272 }
 273
 274 static struct ao_scheme_frame *
 275 ao_scheme_frame_realloc(struct ao_scheme_frame *frame, int new_num)
 276 {
 277         struct ao_scheme_frame_vals     *vals;
 278         struct ao_scheme_frame_vals     *new_vals;
 279         int                             copy;
 280
 281         if (new_num == frame->num)
 282                 return frame;
 283         ao_scheme_frame_stash(0, frame);
 284         new_vals = ao_scheme_frame_vals_new(new_num);
 285         frame = ao_scheme_frame_fetch(0);
 286         if (!new_vals)
 287                 return NULL;
 288         vals = ao_scheme_poly_frame_vals(frame->vals);
 289         copy = new_num;
 290         if (copy > frame->num)
 291                 copy = frame->num;
 292         memcpy(new_vals->vals, vals->vals, copy * sizeof (struct ao_scheme_val));
 293         frame->vals = ao_scheme_frame_vals_poly(new_vals);
 294         frame->num = new_num;
 295         return frame;
 296 }
 297
 298 void
 299 ao_scheme_frame_bind(struct ao_scheme_frame *frame, int num, ao_poly atom, ao_poly val)
 300 {
 301         struct ao_scheme_frame_vals     *vals = ao_scheme_poly_frame_vals(frame->vals);
 302         int                             l = ao_scheme_frame_find(frame, num, atom);
 303
 304         memmove(&vals->vals[l+1],
 305                 &vals->vals[l],
 306                 (num - l) * sizeof (struct ao_scheme_val));
 307         vals->vals[l].atom = atom;
 308         vals->vals[l].val = val;
 309 }
 310
 311 ao_poly
 312 ao_scheme_frame_add(struct ao_scheme_frame *frame, ao_poly atom, ao_poly val)
 313 {
 314         ao_poly *ref = frame ? ao_scheme_frame_ref(frame, atom) : NULL;
 315
 316         if (!ref) {
 317                 int f = frame->num;
 318                 ao_scheme_poly_stash(0, atom);
 319                 ao_scheme_poly_stash(1, val);
 320                 frame = ao_scheme_frame_realloc(frame, f + 1);
 321                 val = ao_scheme_poly_fetch(1);
 322                 atom = ao_scheme_poly_fetch(0);
 323                 if (!frame)
 324                         return AO_SCHEME_NIL;
 325                 ao_scheme_frame_bind(frame, frame->num - 1, atom, val);
 326         } else
 327                 *ref = val;
 328         return val;
 329 }
 330
 331 struct ao_scheme_frame  *ao_scheme_frame_global;
 332 struct ao_scheme_frame  *ao_scheme_frame_current;
 333
 334 void
 335 ao_scheme_frame_init(void)
 336 {
 337         if (!ao_scheme_frame_global)
 338                 ao_scheme_frame_global = ao_scheme_frame_new(0);
 339 }