mono/metadata/method-builder.c

   1 /*
   2  * method-builder.c: Functions for creating IL methods at runtime.
   3  *
   4  * Author:
   5  *   Paolo Molaro (lupus@ximian.com)
   6  *
   7  * Copyright 2002-2003 Ximian, Inc (http://www.ximian.com)
   8  * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
   9  */
  10
  11 #include "config.h"
  12 #include "loader.h"
  13 #include "mono/metadata/method-builder.h"
  14 #include "mono/metadata/tabledefs.h"
  15 #include "mono/metadata/exception.h"
  16 #include "mono/metadata/appdomain.h"
  17 #include "mono/metadata/debug-helpers.h"
  18 #include "mono/metadata/metadata-internals.h"
  19 #include "mono/metadata/domain-internals.h"
  20 #include <string.h>
  21 #include <errno.h>
  22
  23 /* #define DEBUG_RUNTIME_CODE */
  24
  25 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
  26         a = i,
  27
  28 enum {
  29 #include "mono/cil/opcode.def"
  30         LAST = 0xff
  31 };
  32 #undef OPDEF
  33
  34 #ifdef DEBUG_RUNTIME_CODE
  35 static char*
  36 indenter (MonoDisHelper *dh, MonoMethod *method, guint32 ip_offset)
  37 {
  38         return g_strdup (" ");
  39 }
  40
  41 static MonoDisHelper marshal_dh = {
  42         "\n",
  43         "IL_%04x: ",
  44         "IL_%04x",
  45         indenter,
  46         NULL,
  47         NULL
  48 };
  49 #endif
  50
  51 static MonoMethodBuilder *
  52 mono_mb_new_base (MonoClass *klass, MonoWrapperType type)
  53 {
  54         MonoMethodBuilder *mb;
  55         MonoMethod *m;
  56
  57         g_assert (klass != NULL);
  58
  59         mb = g_new0 (MonoMethodBuilder, 1);
  60
  61         mb->method = m = (MonoMethod *)g_new0 (MonoMethodWrapper, 1);
  62
  63         m->klass = klass;
  64         m->inline_info = 1;
  65         m->wrapper_type = type;
  66
  67         mb->code_size = 40;
  68         mb->code = g_malloc (mb->code_size);
  69         /* placeholder for the wrapper always at index 1 */
  70         mono_mb_add_data (mb, NULL);
  71
  72         return mb;
  73 }
  74
  75 MonoMethodBuilder *
  76 mono_mb_new_no_dup_name (MonoClass *klass, const char *name, MonoWrapperType type)
  77 {
  78         MonoMethodBuilder *mb = mono_mb_new_base (klass, type);
  79         mb->name = (char*)name;
  80         mb->no_dup_name = TRUE;
  81         return mb;
  82 }
  83
  84 MonoMethodBuilder *
  85 mono_mb_new (MonoClass *klass, const char *name, MonoWrapperType type)
  86 {
  87         MonoMethodBuilder *mb = mono_mb_new_base (klass, type);
  88         mb->name = g_strdup (name);
  89         return mb;
  90 }
  91
  92 void
  93 mono_mb_free (MonoMethodBuilder *mb)
  94 {
  95         g_list_free (mb->locals_list);
  96         if (!mb->dynamic) {
  97                 g_free (mb->method);
  98                 if (!mb->no_dup_name)
  99                         g_free (mb->name);
 100                 g_free (mb->code);
 101         }
 102         g_free (mb);
 103 }
 104
 105 int
 106 mono_mb_add_local (MonoMethodBuilder *mb, MonoType *type)
 107 {
 108         int res;
 109
 110         g_assert (mb != NULL);
 111         g_assert (type != NULL);
 112
 113         res = mb->locals;
 114         mb->locals_list = g_list_append (mb->locals_list, type);
 115         mb->locals++;
 116
 117         return res;
 118 }
 119
 120 /**
 121  * mono_mb_create_method:
 122  *
 123  * Create a MonoMethod from this method builder.
 124  * Returns: the newly created method.
 125  *
 126  * LOCKING: Takes the loader lock.
 127  */
 128 MonoMethod *
 129 mono_mb_create_method (MonoMethodBuilder *mb, MonoMethodSignature *signature, int max_stack)
 130 {
 131         MonoMethodHeader *header;
 132         MonoMethodWrapper *mw;
 133         MonoImage *image;
 134         MonoMethod *method;
 135         GList *l;
 136         int i;
 137
 138         g_assert (mb != NULL);
 139
 140         image = mb->method->klass->image;
 141
 142         mono_loader_lock (); /*FIXME I think this lock can go.*/
 143         if (mb->dynamic) {
 144                 method = mb->method;
 145                 mw = (MonoMethodWrapper*)method;
 146
 147                 method->name = mb->name;
 148                 method->dynamic = TRUE;
 149
 150                 mw->header = header = (MonoMethodHeader *)
 151                         g_malloc0 (MONO_SIZEOF_METHOD_HEADER + mb->locals * sizeof (MonoType *));
 152
 153                 header->code = mb->code;
 154
 155                 for (i = 0, l = mb->locals_list; l; l = l->next, i++) {
 156                         header->locals [i] = mono_metadata_type_dup (NULL, (MonoType*)l->data);
 157                 }
 158         } else {
 159                 /* Realloc the method info into a mempool */
 160
 161                 method = mono_image_alloc0 (image, sizeof (MonoMethodWrapper));
 162                 memcpy (method, mb->method, sizeof (MonoMethodWrapper));
 163                 mw = (MonoMethodWrapper*) method;
 164
 165                 if (mb->no_dup_name)
 166                         method->name = mb->name;
 167                 else
 168                         method->name = mono_image_strdup (image, mb->name);
 169
 170                 mw->header = header = (MonoMethodHeader *)
 171                         mono_image_alloc0 (image, MONO_SIZEOF_METHOD_HEADER + mb->locals * sizeof (MonoType *));
 172
 173                 header->code = mono_image_alloc (image, mb->pos);
 174                 memcpy ((char*)header->code, mb->code, mb->pos);
 175
 176                 for (i = 0, l = mb->locals_list; l; l = l->next, i++) {
 177                         header->locals [i] = (MonoType *)l->data;
 178                 }
 179         }
 180
 181         if (max_stack < 8)
 182                 max_stack = 8;
 183
 184         header->max_stack = max_stack;
 185
 186         method->signature = signature;
 187
 188         header->code_size = mb->pos;
 189         header->num_locals = mb->locals;
 190         header->init_locals = TRUE;
 191
 192         header->num_clauses = mb->num_clauses;
 193         header->clauses = mb->clauses;
 194
 195         method->skip_visibility = mb->skip_visibility;
 196
 197         i = g_list_length (mw->method_data);
 198         if (i) {
 199                 GList *tmp;
 200                 void **data;
 201                 l = g_list_reverse (mw->method_data);
 202                 if (method->dynamic)
 203                         data = g_malloc (sizeof (gpointer) * (i + 1));
 204                 else
 205                         data = mono_image_alloc (image, sizeof (gpointer) * (i + 1));
 206                 /* store the size in the first element */
 207                 data [0] = GUINT_TO_POINTER (i);
 208                 i = 1;
 209                 for (tmp = l; tmp; tmp = tmp->next) {
 210                         data [i++] = tmp->data;
 211                 }
 212                 g_list_free (l);
 213
 214                 mw->method_data = data;
 215         }
 216         /*{
 217                 static int total_code = 0;
 218                 static int total_alloc = 0;
 219                 total_code += mb->pos;
 220                 total_alloc += mb->code_size;
 221                 g_print ("code size: %d of %d (allocated: %d)\n", mb->pos, total_code, total_alloc);
 222         }*/
 223
 224 #ifdef DEBUG_RUNTIME_CODE
 225         printf ("RUNTIME CODE FOR %s\n", mono_method_full_name (method, TRUE));
 226         printf ("%s\n", mono_disasm_code (&marshal_dh, method, mb->code, mb->code + mb->pos));
 227 #endif
 228
 229         mono_loader_unlock ();
 230         return method;
 231 }
 232
 233 guint32
 234 mono_mb_add_data (MonoMethodBuilder *mb, gpointer data)
 235 {
 236         MonoMethodWrapper *mw;
 237
 238         g_assert (mb != NULL);
 239
 240         mw = (MonoMethodWrapper *)mb->method;
 241
 242         /* one O(n) is enough */
 243         mw->method_data = g_list_prepend (mw->method_data, data);
 244
 245         return g_list_length (mw->method_data);
 246 }
 247
 248 void
 249 mono_mb_patch_addr (MonoMethodBuilder *mb, int pos, int value)
 250 {
 251         mb->code [pos] = value & 0xff;
 252         mb->code [pos + 1] = (value >> 8) & 0xff;
 253         mb->code [pos + 2] = (value >> 16) & 0xff;
 254         mb->code [pos + 3] = (value >> 24) & 0xff;
 255 }
 256
 257 void
 258 mono_mb_patch_addr_s (MonoMethodBuilder *mb, int pos, gint8 value)
 259 {
 260         *((gint8 *)(&mb->code [pos])) = value;
 261 }
 262
 263 void
 264 mono_mb_emit_byte (MonoMethodBuilder *mb, guint8 op)
 265 {
 266         if (mb->pos >= mb->code_size) {
 267                 mb->code_size += mb->code_size >> 1;
 268                 mb->code = g_realloc (mb->code, mb->code_size);
 269         }
 270
 271         mb->code [mb->pos++] = op;
 272 }
 273
 274 void
 275 mono_mb_emit_ldflda (MonoMethodBuilder *mb, gint32 offset)
 276 {
 277         mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
 278         mono_mb_emit_byte (mb, CEE_MONO_OBJADDR);
 279
 280         if (offset) {
 281                 mono_mb_emit_icon (mb, offset);
 282                 mono_mb_emit_byte (mb, CEE_ADD);
 283         }
 284 }
 285
 286 void
 287 mono_mb_emit_i4 (MonoMethodBuilder *mb, gint32 data)
 288 {
 289         if ((mb->pos + 4) >= mb->code_size) {
 290                 mb->code_size += mb->code_size >> 1;
 291                 mb->code = g_realloc (mb->code, mb->code_size);
 292         }
 293
 294         mono_mb_patch_addr (mb, mb->pos, data);
 295         mb->pos += 4;
 296 }
 297
 298 void
 299 mono_mb_emit_i2 (MonoMethodBuilder *mb, gint16 data)
 300 {
 301         if ((mb->pos + 2) >= mb->code_size) {
 302                 mb->code_size += mb->code_size >> 1;
 303                 mb->code = g_realloc (mb->code, mb->code_size);
 304         }
 305
 306         mb->code [mb->pos] = data & 0xff;
 307         mb->code [mb->pos + 1] = (data >> 8) & 0xff;
 308         mb->pos += 2;
 309 }
 310
 311 void
 312 mono_mb_emit_op (MonoMethodBuilder *mb, guint8 op, gpointer data)
 313 {
 314         mono_mb_emit_byte (mb, op);
 315         mono_mb_emit_i4 (mb, mono_mb_add_data (mb, data));
 316 }
 317
 318 void
 319 mono_mb_emit_ldstr (MonoMethodBuilder *mb, char *str)
 320 {
 321         mono_mb_emit_op (mb, CEE_LDSTR, str);
 322 }
 323
 324 void
 325 mono_mb_emit_ldarg (MonoMethodBuilder *mb, guint argnum)
 326 {
 327         if (argnum < 4) {
 328                 mono_mb_emit_byte (mb, CEE_LDARG_0 + argnum);
 329         } else if (argnum < 256) {
 330                 mono_mb_emit_byte (mb, CEE_LDARG_S);
 331                 mono_mb_emit_byte (mb, argnum);
 332         } else {
 333                 mono_mb_emit_byte (mb, CEE_PREFIX1);
 334                 mono_mb_emit_byte (mb, CEE_LDARG);
 335                 mono_mb_emit_i2 (mb, argnum);
 336         }
 337 }
 338
 339 void
 340 mono_mb_emit_ldarg_addr (MonoMethodBuilder *mb, guint argnum)
 341 {
 342         if (argnum < 256) {
 343                 mono_mb_emit_byte (mb, CEE_LDARGA_S);
 344                 mono_mb_emit_byte (mb, argnum);
 345         } else {
 346                 mono_mb_emit_byte (mb, CEE_PREFIX1);
 347                 mono_mb_emit_byte (mb, CEE_LDARGA);
 348                 mono_mb_emit_i2 (mb, argnum);
 349         }
 350 }
 351
 352 void
 353 mono_mb_emit_ldloc_addr (MonoMethodBuilder *mb, guint locnum)
 354 {
 355         if (locnum < 256) {
 356                 mono_mb_emit_byte (mb, CEE_LDLOCA_S);
 357                 mono_mb_emit_byte (mb, locnum);
 358         } else {
 359                 mono_mb_emit_byte (mb, CEE_PREFIX1);
 360                 mono_mb_emit_byte (mb, CEE_LDLOCA);
 361                 mono_mb_emit_i2 (mb, locnum);
 362         }
 363 }
 364
 365 void
 366 mono_mb_emit_ldloc (MonoMethodBuilder *mb, guint num)
 367 {
 368         if (num < 4) {
 369                 mono_mb_emit_byte (mb, CEE_LDLOC_0 + num);
 370         } else if (num < 256) {
 371                 mono_mb_emit_byte (mb, CEE_LDLOC_S);
 372                 mono_mb_emit_byte (mb, num);
 373         } else {
 374                 mono_mb_emit_byte (mb, CEE_PREFIX1);
 375                 mono_mb_emit_byte (mb, CEE_LDLOC);
 376                 mono_mb_emit_i2 (mb, num);
 377         }
 378 }
 379
 380 void
 381 mono_mb_emit_stloc (MonoMethodBuilder *mb, guint num)
 382 {
 383         if (num < 4) {
 384                 mono_mb_emit_byte (mb, CEE_STLOC_0 + num);
 385         } else if (num < 256) {
 386                 mono_mb_emit_byte (mb, CEE_STLOC_S);
 387                 mono_mb_emit_byte (mb, num);
 388         } else {
 389                 mono_mb_emit_byte (mb, CEE_PREFIX1);
 390                 mono_mb_emit_byte (mb, CEE_STLOC);
 391                 mono_mb_emit_i2 (mb, num);
 392         }
 393 }
 394
 395 void
 396 mono_mb_emit_icon (MonoMethodBuilder *mb, gint32 value)
 397 {
 398         if (value >= -1 && value < 8) {
 399                 mono_mb_emit_byte (mb, CEE_LDC_I4_0 + value);
 400         } else if (value >= -128 && value <= 127) {
 401                 mono_mb_emit_byte (mb, CEE_LDC_I4_S);
 402                 mono_mb_emit_byte (mb, value);
 403         } else {
 404                 mono_mb_emit_byte (mb, CEE_LDC_I4);
 405                 mono_mb_emit_i4 (mb, value);
 406         }
 407 }
 408
 409 int
 410 mono_mb_get_label (MonoMethodBuilder *mb)
 411 {
 412         return mb->pos;
 413 }
 414
 415 int
 416 mono_mb_get_pos (MonoMethodBuilder *mb)
 417 {
 418         return mb->pos;
 419 }
 420
 421 guint32
 422 mono_mb_emit_branch (MonoMethodBuilder *mb, guint8 op)
 423 {
 424         guint32 res;
 425         mono_mb_emit_byte (mb, op);
 426         res = mb->pos;
 427         mono_mb_emit_i4 (mb, 0);
 428         return res;
 429 }
 430
 431 guint32
 432 mono_mb_emit_short_branch (MonoMethodBuilder *mb, guint8 op)
 433 {
 434         guint32 res;
 435         mono_mb_emit_byte (mb, op);
 436         res = mb->pos;
 437         mono_mb_emit_byte (mb, 0);
 438
 439         return res;
 440 }
 441
 442 void
 443 mono_mb_emit_branch_label (MonoMethodBuilder *mb, guint8 op, guint32 label)
 444 {
 445         mono_mb_emit_byte (mb, op);
 446         mono_mb_emit_i4 (mb, label - (mb->pos + 4));
 447 }
 448
 449 void
 450 mono_mb_patch_branch (MonoMethodBuilder *mb, guint32 pos)
 451 {
 452         mono_mb_patch_addr (mb, pos, mb->pos - (pos + 4));
 453 }
 454
 455 void
 456 mono_mb_patch_short_branch (MonoMethodBuilder *mb, guint32 pos)
 457 {
 458         mono_mb_patch_addr_s (mb, pos, mb->pos - (pos + 1));
 459 }
 460
 461 void
 462 mono_mb_emit_ptr (MonoMethodBuilder *mb, gpointer ptr)
 463 {
 464         mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
 465         mono_mb_emit_op (mb, CEE_MONO_LDPTR, ptr);
 466 }
 467
 468 void
 469 mono_mb_emit_calli (MonoMethodBuilder *mb, MonoMethodSignature *sig)
 470 {
 471         mono_mb_emit_op (mb, CEE_CALLI, sig);
 472 }
 473
 474 void
 475 mono_mb_emit_managed_call (MonoMethodBuilder *mb, MonoMethod *method, MonoMethodSignature *opt_sig)
 476 {
 477         mono_mb_emit_op (mb, CEE_CALL, method);
 478 }
 479
 480 void
 481 mono_mb_emit_native_call (MonoMethodBuilder *mb, MonoMethodSignature *sig, gpointer func)
 482 {
 483         mono_mb_emit_ptr (mb, func);
 484         mono_mb_emit_calli (mb, sig);
 485 }
 486
 487 void
 488 mono_mb_emit_icall (MonoMethodBuilder *mb, gpointer func)
 489 {
 490         mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
 491         mono_mb_emit_op (mb, CEE_MONO_ICALL, func);
 492 }
 493
 494 void
 495 mono_mb_emit_exception_full (MonoMethodBuilder *mb, const char *exc_nspace, const char *exc_name, const char *msg)
 496 {
 497         MonoMethod *ctor = NULL;
 498
 499         MonoClass *mme = mono_class_from_name (mono_defaults.corlib, exc_nspace, exc_name);
 500         mono_class_init (mme);
 501         ctor = mono_class_get_method_from_name (mme, ".ctor", 0);
 502         g_assert (ctor);
 503         mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
 504         if (msg != NULL) {
 505                 mono_mb_emit_byte (mb, CEE_DUP);
 506                 mono_mb_emit_ldflda (mb, G_STRUCT_OFFSET (MonoException, message));
 507                 mono_mb_emit_ldstr (mb, (char*)msg);
 508                 mono_mb_emit_byte (mb, CEE_STIND_REF);
 509         }
 510         mono_mb_emit_byte (mb, CEE_THROW);
 511 }
 512
 513 void
 514 mono_mb_emit_exception (MonoMethodBuilder *mb, const char *exc_name, const char *msg)
 515 {
 516         mono_mb_emit_exception_full (mb, "System", exc_name, msg);
 517 }
 518
 519 void
 520 mono_mb_emit_add_to_local (MonoMethodBuilder *mb, guint16 local, gint32 incr)
 521 {
 522         mono_mb_emit_ldloc (mb, local);
 523         mono_mb_emit_icon (mb, incr);
 524         mono_mb_emit_byte (mb, CEE_ADD);
 525         mono_mb_emit_stloc (mb, local);
 526 }
 527
 528 void
 529 mono_mb_set_clauses (MonoMethodBuilder *mb, int num_clauses, MonoExceptionClause *clauses)
 530 {
 531         mb->num_clauses = num_clauses;
 532         mb->clauses = clauses;
 533 }