src/backends/jvm/generator-jvm-basic.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <stdarg.h>
   4 #include <stdbool.h>
   5 #include <string.h>
   6 #include <assert.h>
   7
   8 #include <gc.h>
   9
  10 #include "../../../include/oberon.h"
  11 #include "../../oberon-internals.h"
  12 #include "generator-jvm.h"
  13 #include "generator-jvm-basic.h"
  14
  15 char *
  16 new_string(const char * format, ...)
  17 {
  18         va_list ptr;
  19         va_start(ptr, format);
  20
  21         char buf[1024];
  22         vsnprintf(buf, 1024, format, ptr);
  23
  24         va_end(ptr);
  25
  26         char * result;
  27         int size;
  28
  29         size = strlen(buf);
  30         result = GC_MALLOC(size + 1);
  31         memset(result, 0, size);
  32         strncpy(result, buf, size);
  33
  34         return result;
  35 }
  36
  37 void
  38 gen_error(const char * fmt, ...)
  39 {
  40         va_list ptr;
  41         va_start(ptr, fmt);
  42         fprintf(stderr, "generator: ");
  43         vfprintf(stderr, fmt, ptr);
  44         fprintf(stderr, "\n");
  45         va_end(ptr);
  46         exit(1);
  47 }
  48
  49 char *
  50 jvm_get_descriptor(oberon_type_t * type)
  51 {
  52         char * desc;
  53
  54         switch(type -> class)
  55         {
  56                 case OBERON_TYPE_VOID:
  57                         return new_string("V");
  58                         break;
  59                 case OBERON_TYPE_INTEGER:
  60                         switch(type -> size)
  61                         {
  62                                 case 1:
  63                                         return new_string("B");
  64                                         break;
  65                                 case 2:
  66                                         return new_string("S");
  67                                         break;
  68                                 case 4:
  69                                         return new_string("I");
  70                                         break;
  71                                 case 8:
  72                                         return new_string("J");
  73                                         break;
  74                                 default:
  75                                         gen_error("jvm_get_descriptor: unsupported int size %i", type -> size);
  76                                         break;
  77                         }
  78                         break;
  79                 case OBERON_TYPE_REAL:
  80                         switch(type -> size)
  81                         {
  82                                 case 4:
  83                                         return new_string("F");
  84                                         break;
  85                                 case 8:
  86                                         return new_string("D");
  87                                         break;
  88                                 default:
  89                                         gen_error("jvm_get_descriptor: unsupported float size %i", type -> size);
  90                                         break;
  91                         }
  92                         break;
  93                 case OBERON_TYPE_BOOLEAN:
  94                         return new_string("Z");
  95                         break;
  96                 case OBERON_TYPE_POINTER:
  97                         return jvm_get_descriptor(type -> base);
  98                         break;
  99                 case OBERON_TYPE_PROCEDURE:
 100                 case OBERON_TYPE_RECORD:
 101                         desc = jvm_get_class_full_name(type);
 102                         return new_string("L%s;", desc);
 103                         break;
 104                 case OBERON_TYPE_ARRAY:
 105                         desc = jvm_get_descriptor(type -> base);
 106                         return new_string("[%s", desc);
 107                         break;
 108                 default:
 109                         gen_error("jvm_get_descriptor: unsupported type class %i", type -> class);
 110                         break;
 111         }
 112
 113         return NULL;
 114 }
 115
 116 char
 117 jvm_get_prefix(oberon_type_t * type)
 118 {
 119         int size = type -> size;
 120         switch(type -> class)
 121         {
 122                 case OBERON_TYPE_BOOLEAN:
 123                 case OBERON_TYPE_INTEGER:
 124                         return (size <= 4) ? ('i') : ('l');
 125                         break;
 126                 case OBERON_TYPE_PROCEDURE:
 127                 case OBERON_TYPE_ARRAY:
 128                 case OBERON_TYPE_RECORD:
 129                 case OBERON_TYPE_POINTER:
 130                         return 'a';
 131                         break;
 132                 case OBERON_TYPE_REAL:
 133                         return (size <= 4) ? ('f') : ('d');
 134                         break;
 135         }
 136
 137         gen_error("jvm_get_prefix: wat");
 138         return '!';
 139 }
 140
 141 char
 142 jvm_get_postfix(oberon_type_t * type)
 143 {
 144         int size = type -> size;
 145         switch(type -> class)
 146         {
 147                 case OBERON_TYPE_BOOLEAN:
 148                         return 'b';
 149                         break;
 150                 case OBERON_TYPE_INTEGER:
 151                         switch(size)
 152                         {
 153                                 case 1:
 154                                         return 'b';
 155                                         break;
 156                                 case 2:
 157                                         return 's';
 158                                         break;
 159                                 case 4:
 160                                         return 'i';
 161                                         break;
 162                                 case 8:
 163                                         return 'l';
 164                                         break;
 165                                 default:
 166                                         gen_error("jvm_get_postfix: int wat");
 167                                         break;
 168                         }
 169                         break;
 170                 case OBERON_TYPE_PROCEDURE:
 171                 case OBERON_TYPE_ARRAY:
 172                 case OBERON_TYPE_RECORD:
 173                 case OBERON_TYPE_POINTER:
 174                         return 'a';
 175                         break;
 176                 case OBERON_TYPE_REAL:
 177                         return (size <= 4) ? ('f') : ('d');
 178                         break;
 179                 default:
 180                         gen_error("jvm_get_postfix: wat");
 181                         break;
 182         }
 183
 184         return '!';
 185 }
 186
 187 char *
 188 jvm_get_field_full_name(oberon_object_t * x)
 189 {
 190         switch(x -> class)
 191         {
 192                 case OBERON_CLASS_VAR:
 193                 case OBERON_CLASS_PROC:
 194                         return new_string("%s/%s", x -> module -> name, x -> name);
 195                 case OBERON_CLASS_FIELD:;
 196                         char * rec_name = jvm_get_class_full_name(x -> parent_type);
 197                         return new_string("%s/%s", rec_name, x -> name);
 198                 case OBERON_CLASS_MODULE:
 199                         return new_string(x -> module -> name);
 200                 default:
 201                         gen_error("jvm_get_field_full_name: wat");
 202                         break;
 203         }
 204
 205         return NULL;
 206 }
 207
 208 char *
 209 jvm_get_class_full_name(oberon_type_t * type)
 210 {
 211         int rec_id;
 212         char * name = NULL;
 213
 214         switch(type -> class)
 215         {
 216                 case OBERON_TYPE_PROCEDURE:
 217                         name = new_string("SYSTEM$PROCEDURE");
 218
 219                         char * desc;
 220                         desc = jvm_get_descriptor(type -> base);
 221                         name = new_string("%s$%s", name, desc);
 222
 223                         int num = type -> num_decl;
 224                         oberon_object_t * arg = type -> decl;
 225                         for(int i = 0; i < num; i++)
 226                         {
 227                                 desc = jvm_get_descriptor(arg -> type);
 228                                 name = new_string("%s%s", name, desc);
 229                                 arg = arg -> next;
 230                         }
 231
 232                         break;
 233                 case OBERON_TYPE_RECORD:
 234                         rec_id = type -> gen_type -> rec_id;
 235                         name = new_string("%s$RECORD%i", type -> module -> name, rec_id);
 236                         break;
 237                 default:
 238                         gen_error("jvm_get_class_full_name: unk type class %i", type -> class);
 239                         break;
 240         }
 241
 242         return name;
 243 }
 244
 245 char *
 246 jvm_get_procedure_signature(oberon_type_t * proc)
 247 {
 248         char * signature;
 249         char * desc;
 250
 251         signature = new_string("(");
 252
 253         int num = proc -> num_decl;
 254         oberon_object_t * arg = proc -> decl;
 255         for(int i = 0; i < num; i++)
 256         {
 257                 desc = jvm_get_descriptor(arg -> type);
 258                 signature = new_string("%s%s", signature, desc);
 259                 arg = arg -> next;
 260         }
 261
 262         desc = jvm_get_descriptor(proc -> base);
 263         signature = new_string("%s)%s", signature, desc);
 264
 265         return signature;
 266 }
 267
 268 int
 269 jvm_cell_size_for_type(oberon_type_t * type)
 270 {
 271         if(type -> class == OBERON_TYPE_INTEGER
 272                 || type -> class == OBERON_TYPE_REAL)
 273         {
 274                 if(type -> size > 4)
 275                 {
 276                         return 2;
 277                 }
 278         }
 279
 280         return 1;
 281 }
 282
 283 int
 284 jvm_cell_size_for_postfix(char postfix)
 285 {
 286         switch(postfix)
 287         {
 288                 case 'a':
 289                 case 'b':
 290                 case 's':
 291                 case 'i':
 292                 case 'f':
 293                         return 1;
 294                 case 'l':
 295                 case 'd':
 296                         return 2;
 297                 default:
 298                         gen_error("jvm_cell_size_for_postfix: unk postfix %c", postfix);
 299         }
 300
 301         return -666;
 302 }
 303
 304 bool
 305 jvm_is_wide_type(oberon_type_t * type)
 306 {
 307         int cell;
 308         cell = jvm_cell_size_for_type(type);
 309         assert(cell <= 2);
 310         return (cell == 2);
 311 }
 312
 313 bool
 314 jvm_is_free_register(struct gen_register_file * rf, int i, bool wide)
 315 {
 316         if(wide)
 317         {
 318                 assert(i + 1 < MAX_REGISTERS);
 319                 return !(rf -> reg[i].used || rf -> reg[i + 1].used);
 320         }
 321         else
 322         {
 323                 assert(i < MAX_REGISTERS);
 324                 return !(rf -> reg[i].used);
 325         }
 326 }
 327
 328 int
 329 jvm_alloc_register_untyped(struct gen_register_file * rf, bool wide)
 330 {
 331         int i = 0;
 332         while(i < MAX_REGISTERS && !jvm_is_free_register(rf, i, wide))
 333         {
 334                 i += 1;
 335         }
 336
 337         if(wide)
 338         {
 339                 assert(i + 1 <= MAX_REGISTERS);
 340                 rf -> num_used += 2;
 341                 rf -> reg[i].used = true;
 342                 rf -> reg[i + 1].used = true;
 343                 rf -> reg[i].used = true;
 344                 rf -> reg[i + 1].wide = false;
 345         }
 346         else
 347         {
 348                 assert(i <= MAX_REGISTERS);
 349                 rf -> num_used += 1;
 350                 rf -> reg[i].used = true;
 351                 rf -> reg[i].wide = false;
 352         }
 353
 354         if(rf -> num_used > rf -> max_used)
 355         {
 356                 rf -> max_used = rf -> num_used;
 357         }
 358
 359         return i;
 360 }
 361
 362 int
 363 jvm_alloc_register(struct gen_register_file * rf, oberon_type_t * type)
 364 {
 365         bool wide;
 366         wide = jvm_is_wide_type(type);
 367         return jvm_alloc_register_untyped(rf, wide);
 368 }
 369
 370 char
 371 jvm_get_type_of_prefix(char prefix)
 372 {
 373         switch(prefix)
 374         {
 375                 case 'b':
 376                         return 'B';
 377                 case 'c':
 378                         return 'C';
 379                 case 'd':
 380                         return 'D';
 381                 case 'f':
 382                         return 'F';
 383                 case 'i':
 384                         return 'I';
 385                 case 'l':
 386                         return 'J';
 387         }
 388
 389         assert(0);
 390 }