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_field_full_name(oberon_object_t * x)
 143 {
 144         switch(x -> class)
 145         {
 146                 case OBERON_CLASS_VAR:
 147                         return new_string("%s/%s", x -> module -> name, x -> name);
 148                 case OBERON_CLASS_FIELD:;
 149                         char * rec_name = jvm_get_class_full_name(x -> parent_type);
 150                         return new_string("%s/%s", rec_name, x -> name);
 151                 case OBERON_CLASS_MODULE:
 152                         return new_string(x -> module -> name);
 153                 default:
 154                         gen_error("jvm_get_field_full_name: wat");
 155                         break;
 156         }
 157
 158         return NULL;
 159 }
 160
 161 char *
 162 jvm_get_class_full_name(oberon_type_t * type)
 163 {
 164         int rec_id;
 165         char * name = NULL;
 166
 167         switch(type -> class)
 168         {
 169                 case OBERON_TYPE_PROCEDURE:
 170                         name = new_string("SYSTEM$PROCEDURE");
 171
 172                         char * desc;
 173                         desc = jvm_get_descriptor(type -> base);
 174                         name = new_string("%s$%s", name, desc);
 175
 176                         int num = type -> num_decl;
 177                         oberon_object_t * arg = type -> decl;
 178                         for(int i = 0; i < num; i++)
 179                         {
 180                                 desc = jvm_get_descriptor(arg -> type);
 181                                 name = new_string("%s%s", name, desc);
 182                                 arg = arg -> next;
 183                         }
 184
 185                         break;
 186                 case OBERON_TYPE_RECORD:
 187                         rec_id = type -> gen_type -> rec_id;
 188                         name = new_string("%s$RECORD%i", type -> module -> name, rec_id);
 189                         break;
 190                 default:
 191                         gen_error("jvm_get_class_full_name: unk type class %i", type -> class);
 192                         break;
 193         }
 194
 195         return name;
 196 }
 197
 198 char *
 199 jvm_get_procedure_signature(oberon_type_t * proc)
 200 {
 201         char * signature;
 202         char * desc;
 203
 204         signature = new_string("(");
 205
 206         int num = proc -> num_decl;
 207         oberon_object_t * arg = proc -> decl;
 208         for(int i = 0; i < num; i++)
 209         {
 210                 desc = jvm_get_descriptor(arg -> type);
 211                 signature = new_string("%s%s", signature, desc);
 212                 arg = arg -> next;
 213         }
 214
 215         desc = jvm_get_descriptor(proc -> base);
 216         signature = new_string("%s)%s", signature, desc);
 217
 218         return signature;
 219 }
 220
 221 int
 222 jvm_cell_size_for_type(oberon_type_t * type)
 223 {
 224         if(type -> class == OBERON_TYPE_INTEGER
 225                 || type -> class == OBERON_TYPE_REAL)
 226         {
 227                 if(type -> size > 4)
 228                 {
 229                         return 2;
 230                 }
 231         }
 232
 233         return 1;
 234 }
 235
 236 int
 237 jvm_cell_size_for_prefix(char prefix)
 238 {
 239         switch(prefix)
 240         {
 241                 case 'a':
 242                 case 'b':
 243                 case 's':
 244                 case 'i':
 245                 case 'z':
 246                 case 'f':
 247                         return 1;
 248                 case 'l':
 249                 case 'd':
 250                         return 2;
 251                 default:
 252                         gen_error("jvm_cell_size_for_prefix: unk prefix %c", prefix);
 253         }
 254
 255         return -666;
 256 }
 257
 258 bool
 259 jvm_is_wide_type(oberon_type_t * type)
 260 {
 261         int cell;
 262         cell = jvm_cell_size_for_type(type);
 263         assert(cell <= 2);
 264         return (cell == 2);
 265 }
 266
 267 bool
 268 jvm_is_free_register(struct gen_register_file * rf, int i, bool wide)
 269 {
 270         if(wide)
 271         {
 272                 assert(i + 1 < MAX_REGISTERS);
 273                 return !(rf -> reg[i].used || rf -> reg[i + 1].used);
 274         }
 275         else
 276         {
 277                 assert(i < MAX_REGISTERS);
 278                 return !(rf -> reg[i].used);
 279         }
 280 }
 281
 282 int
 283 jvm_alloc_register_untyped(struct gen_register_file * rf, bool wide)
 284 {
 285         int i = 0;
 286         while(i < MAX_REGISTERS && !jvm_is_free_register(rf, i, wide))
 287         {
 288                 i += 1;
 289         }
 290
 291         if(wide)
 292         {
 293                 assert(i + 1 <= MAX_REGISTERS);
 294                 rf -> num_used += 2;
 295                 rf -> reg[i].used = true;
 296                 rf -> reg[i + 1].used = true;
 297                 rf -> reg[i].used = true;
 298                 rf -> reg[i + 1].wide = false;
 299         }
 300         else
 301         {
 302                 assert(i <= MAX_REGISTERS);
 303                 rf -> num_used += 1;
 304                 rf -> reg[i].used = true;
 305                 rf -> reg[i].wide = false;
 306         }
 307
 308         if(rf -> num_used > rf -> max_used)
 309         {
 310                 rf -> max_used = rf -> num_used;
 311         }
 312
 313         return i;
 314 }
 315
 316 int
 317 jvm_alloc_register(struct gen_register_file * rf, oberon_type_t * type)
 318 {
 319         bool wide;
 320         wide = jvm_is_wide_type(type);
 321         return jvm_alloc_register_untyped(rf, wide);
 322 }
 323
 324 char
 325 jvm_get_type_of_prefix(char prefix)
 326 {
 327         switch(prefix)
 328         {
 329                 case 'b':
 330                         return 'B';
 331                 case 'c':
 332                         return 'C';
 333                 case 'd':
 334                         return 'D';
 335                 case 'f':
 336                         return 'F';
 337                 case 'i':
 338                         return 'I';
 339                 case 'l':
 340                         return 'J';
 341         }
 342
 343         assert(0);
 344 }