mono/monograph/monograph.c

   1 #include <glib.h>
   2 #include <string.h>
   3 #include "mono/metadata/class.h"
   4 #include "mono/metadata/assembly.h"
   5 #include "mono/metadata/tokentype.h"
   6 #include "mono/metadata/opcodes.h"
   7 #include "mono/metadata/tabledefs.h"
   8 #include "mono/metadata/cil-coff.h" /* MonoCLIImageInfo */
   9 #include "mono/metadata/mono-endian.h"
  10 #include "mono/metadata/appdomain.h" /* mono_init */
  11 #include "mono/metadata/debug-helpers.h"
  12
  13 static FILE *output;
  14 static int include_namespace = 0;
  15 static int max_depth = 6;
  16 static int verbose = 0;
  17 static char *graph_properties = "\tnode [fontsize=8.0]\n\tedge [len=2,color=red]\n";
  18
  19 static void
  20 output_type_edge (MonoClass *first, MonoClass *second) {
  21         if (include_namespace)
  22                 fprintf (output, "\t\"%s.%s\" -> \"%s.%s\"\n", first->name_space, first->name, second->name_space, second->name);
  23         else
  24                 fprintf (output, "\t\"%s\" -> \"%s\"\n", first->name, second->name);
  25 }
  26
  27 static void
  28 print_subtypes (MonoImage *image, MonoClass *class, int depth) {
  29         int i, index;
  30         MonoTableInfo *t;
  31         MonoClass *child;
  32
  33         if (depth++ > max_depth)
  34                 return;
  35
  36         t = &image->tables [MONO_TABLE_TYPEDEF];
  37
  38         index = mono_metadata_token_index (class->type_token);
  39         index <<= TYPEDEFORREF_BITS;
  40         index |= TYPEDEFORREF_TYPEDEF;
  41
  42         /* use a subgraph? */
  43         for (i = 0; i < t->rows; ++i) {
  44                 if (index == mono_metadata_decode_row_col (t, i, MONO_TYPEDEF_EXTENDS)) {
  45                         child = mono_class_get (image, MONO_TOKEN_TYPE_DEF | (i + 1));
  46                         output_type_edge (class, child);
  47                         print_subtypes (image, child, depth);
  48                 }
  49         }
  50 }
  51
  52 static void
  53 type_graph (MonoImage *image, char* cname) {
  54         MonoClass *class;
  55         MonoClass *parent;
  56         MonoClass *child;
  57         char *name_space;
  58         char *p;
  59         int depth = 0;
  60
  61         cname = g_strdup (cname);
  62         p = strrchr (cname, '.');
  63         if (p) {
  64                 name_space = cname;
  65                 *p++ = 0;
  66                 cname = p;
  67         } else {
  68                 name_space = "";
  69         }
  70         class = mono_class_from_name (image, name_space, cname);
  71         if (!class) {
  72                 g_print ("class %s.%s not found\n", name_space, cname);
  73                 exit (1);
  74         }
  75         fprintf (output, "digraph blah {\n");
  76         fprintf (output, "%s", graph_properties);
  77         child = class;
  78         /* go back and print the parents for the node as well: not sure it's a good idea */
  79         for (parent = class->parent; parent; parent = parent->parent) {
  80                 output_type_edge (parent, child);
  81                 child = parent;
  82         }
  83         print_subtypes (image, class, depth);
  84         fprintf (output, "}\n");
  85 }
  86
  87 static void
  88 interface_graph (MonoImage *image, char* cname) {
  89         MonoClass *class;
  90         MonoClass *child;
  91         char *name_space;
  92         char *p;
  93         guint32 cols [MONO_INTERFACEIMPL_SIZE];
  94         guint32 index, i, count = 0;
  95         MonoTableInfo *intf = &image->tables [MONO_TABLE_INTERFACEIMPL];
  96
  97         cname = g_strdup (cname);
  98         p = strrchr (cname, '.');
  99         if (p) {
 100                 name_space = cname;
 101                 *p++ = 0;
 102                 cname = p;
 103         } else {
 104                 name_space = "";
 105         }
 106         class = mono_class_from_name (image, name_space, cname);
 107         if (!class) {
 108                 g_print ("interface %s.%s not found\n", name_space, cname);
 109                 exit (1);
 110         }
 111         /* chek if it's really an interface... */
 112         fprintf (output, "digraph interface {\n");
 113         fprintf (output, "%s", graph_properties);
 114         /* TODO: handle inetrface defined in one image and class defined in another. */
 115         index = mono_metadata_token_index (class->type_token);
 116         index <<= TYPEDEFORREF_BITS;
 117         index |= TYPEDEFORREF_TYPEDEF;
 118         for (i = 0; i < intf->rows; ++i) {
 119                 mono_metadata_decode_row (intf, i, cols, MONO_INTERFACEIMPL_SIZE);
 120                 /*g_print ("index: %d [%d implements %d]\n", index, cols [MONO_INTERFACEIMPL_CLASS], cols [MONO_INTERFACEIMPL_INTERFACE]);*/
 121                 if (index == cols [MONO_INTERFACEIMPL_INTERFACE]) {
 122                         child = mono_class_get (image, MONO_TOKEN_TYPE_DEF | cols [MONO_INTERFACEIMPL_CLASS]);
 123                         output_type_edge (class, child);
 124                         count++;
 125                 }
 126         }
 127         fprintf (output, "}\n");
 128         if (verbose && !count)
 129                 g_print ("No class implements %s.%s\n", class->name_space, class->name);
 130
 131 }
 132
 133 static char *
 134 get_signature (MonoMethod *method) {
 135         GString *res;
 136         static GHashTable *hash = NULL;
 137         char *result;
 138
 139         if (!hash)
 140                 hash = g_hash_table_new (g_direct_hash, g_direct_equal);
 141         if ((result = g_hash_table_lookup (hash, method)))
 142                 return result;
 143
 144         res = g_string_new ("");
 145         if (include_namespace && *(method->klass->name_space))
 146                 g_string_sprintfa (res, "%s.", method->klass->name_space);
 147         result = mono_signature_get_desc (method->signature, include_namespace);
 148         g_string_sprintfa (res, "%s:%s(%s)", method->klass->name, method->name, result);
 149         g_free (result);
 150         g_hash_table_insert (hash, method, res->str);
 151
 152         result = res->str;
 153         g_string_free (res, FALSE);
 154         return result;
 155
 156 }
 157
 158 static void
 159 output_method_edge (MonoMethod *first, MonoMethod *second) {
 160         char * f = get_signature (first);
 161         char * s = get_signature (second);
 162
 163         fprintf (output, "\t\"%s\" -> \"%s\"\n", f, s);
 164 }
 165
 166 /*
 167  * We need to handle virtual calls is derived types.
 168  * We could check what types implement the method and
 169  * disassemble all of them: this can make the graph to explode.
 170  * We could try and keep track of the 'this' pointer type and
 171  * consider only the methods in the classes derived from that:
 172  * this can reduce the graph complexity somewhat (and it would
 173  * be the more correct approach).
 174  */
 175 static void
 176 print_method (MonoMethod *method, int depth) {
 177         const MonoOpcode *opcode;
 178         MonoMethodHeader *header;
 179         GHashTable *hash;
 180         const unsigned char *ip;
 181         int i;
 182
 183         if (depth++ > max_depth)
 184                 return;
 185         if (method->info) /* avoid recursion */
 186                 return;
 187         method->info = method;
 188
 189         if (method->iflags & (METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL | METHOD_IMPL_ATTRIBUTE_RUNTIME))
 190                 return;
 191         if (method->flags & (METHOD_ATTRIBUTE_PINVOKE_IMPL | METHOD_ATTRIBUTE_ABSTRACT))
 192                 return;
 193
 194         header = ((MonoMethodNormal *)method)->header;
 195         ip = header->code;
 196
 197         hash = g_hash_table_new (g_direct_hash, g_direct_equal);
 198
 199         while (ip < (header->code + header->code_size)) {
 200                 if (*ip == 0xfe) {
 201                         ++ip;
 202                         i = *ip + 256;
 203                 } else {
 204                         i = *ip;
 205                 }
 206
 207                 opcode = &mono_opcodes [i];
 208
 209                 switch (opcode->argument) {
 210                 case MonoInlineNone:
 211                         ++ip;
 212                         break;
 213                 case MonoInlineType:
 214                 case MonoInlineField:
 215                 case MonoInlineTok:
 216                 case MonoInlineString:
 217                 case MonoInlineSig:
 218                 case MonoShortInlineR:
 219                 case MonoInlineI:
 220                 case MonoInlineBrTarget:
 221                         ip += 5;
 222                         break;
 223                 case MonoInlineVar:
 224                         ip += 3;
 225                         break;
 226                 case MonoShortInlineVar:
 227                 case MonoShortInlineI:
 228                 case MonoShortInlineBrTarget:
 229                         ip += 2;
 230                         break;
 231                 case MonoInlineSwitch: {
 232                         gint32 n;
 233                         ++ip;
 234                         n = read32 (ip);
 235                         ip += 4;
 236                         ip += 4 * n;
 237                         break;
 238                 }
 239                 case MonoInlineR:
 240                 case MonoInlineI8:
 241                         ip += 9;
 242                         break;
 243                 case MonoInlineMethod: {
 244                         guint32 token;
 245                         MonoMethod *called;
 246                         ip++;
 247                         token = read32 (ip);
 248                         ip += 4;
 249                         called = mono_get_method (method->klass->image, token, NULL);
 250                         if (!called)
 251                                 break; /* warn? */
 252                         if (g_hash_table_lookup (hash, called))
 253                                 break;
 254                         g_hash_table_insert (hash, called, called);
 255                         output_method_edge (method, called);
 256                         print_method (called, depth);
 257                         break;
 258                 }
 259                 default:
 260                         g_assert_not_reached ();
 261                 }
 262         }
 263         g_hash_table_destroy (hash);
 264 }
 265
 266 static void
 267 method_graph (MonoImage *image, char *name) {
 268         int depth = 0;
 269         MonoMethod *method = NULL;
 270
 271         if (!name) {
 272                 guint32 token = ((MonoCLIImageInfo*)image->image_info)->cli_cli_header.ch_entry_point;
 273                 if (!token || !(method = mono_get_method (image, token, NULL))) {
 274                         g_print ("Cannot find entry point in %s: specify an explict method name.\n", image->name);
 275                         exit (1);
 276                 }
 277         } else {
 278                 /* search the method */
 279                 MonoMethodDesc *desc;
 280
 281                 desc = mono_method_desc_new (name, include_namespace);
 282                 if (!desc) {
 283                         g_print ("Invalid method name %s\n", name);
 284                         exit (1);
 285                 }
 286                 method = mono_method_desc_search_in_image (desc, image);
 287                 if (!method) {
 288                         g_print ("Cannot find method %s\n", name);
 289                         exit (1);
 290                 }
 291         }
 292         fprintf (output, "digraph blah {\n");
 293         fprintf (output, "%s", graph_properties);
 294
 295         print_method (method, depth);
 296
 297         fprintf (output, "}\n");
 298 }
 299
 300 typedef struct MonoBasicBlock MonoBasicBlock;
 301
 302 struct MonoBasicBlock {
 303         const unsigned char* cil_code;
 304         gint32 cil_length;
 305         gint dfn;
 306         GList *in_bb;
 307         GList *out_bb;
 308 };
 309
 310 static const unsigned char *debug_start;
 311
 312 static void
 313 link_bblock (MonoBasicBlock *from, MonoBasicBlock* to)
 314 {
 315         from->out_bb = g_list_prepend (from->out_bb, to);
 316         to->in_bb = g_list_prepend (to->in_bb, from);
 317         /*fprintf (stderr, "linking IL_%04x to IL_%04x\n", from->cil_code-debug_start, to->cil_code-debug_start);*/
 318 }
 319
 320 static int
 321 compare_bblock (void *a, void *b)
 322 {
 323         MonoBasicBlock **ab = a;
 324         MonoBasicBlock **bb = b;
 325
 326         return (*ab)->cil_code - (*bb)->cil_code;
 327 }
 328
 329 static GPtrArray*
 330 mono_method_find_bblocks (MonoMethodHeader *header)
 331 {
 332         const unsigned char *ip, *end, *start;
 333         const MonoOpcode *opcode;
 334         int i, block_end = 0;
 335         GPtrArray *result = g_ptr_array_new ();
 336         GHashTable *table = g_hash_table_new (g_direct_hash, g_direct_equal);
 337         MonoBasicBlock *entry_bb, *end_bb, *bb, *target;
 338
 339         ip = header->code;
 340         end = ip + header->code_size;
 341         debug_start = ip;
 342
 343         entry_bb = g_new0 (MonoBasicBlock, 1);
 344         end_bb = g_new0 (MonoBasicBlock, 1);
 345         g_ptr_array_add (result, entry_bb);
 346         g_ptr_array_add (result, end_bb);
 347
 348         bb = g_new0 (MonoBasicBlock, 1);
 349         bb->cil_code = ip;
 350         g_ptr_array_add (result, bb);
 351         link_bblock (entry_bb, bb);
 352         g_hash_table_insert (table, (char*)ip, bb);
 353         block_end = TRUE;
 354
 355         /* handle exception code blocks... */
 356         while (ip < end) {
 357                 start = ip;
 358                 if ((target = g_hash_table_lookup (table, ip)) && target != bb) {
 359                         link_bblock (bb, target);
 360                         bb = target;
 361                         block_end = FALSE;
 362                 }
 363                 if (block_end) {
 364                         /*fprintf (stderr, "processing bbclok at IL_%04x\n", ip - header->code);*/
 365                         if (!(bb = g_hash_table_lookup (table, ip))) {
 366                                 bb = g_new0 (MonoBasicBlock, 1);
 367                                 bb->cil_code = ip;
 368                                 g_ptr_array_add (result, bb);
 369                                 g_hash_table_insert (table, (char*)ip, bb);
 370                         }
 371                         block_end = FALSE;
 372                 }
 373                 if (*ip == 0xfe) {
 374                         ++ip;
 375                         i = *ip + 256;
 376                 } else {
 377                         i = *ip;
 378                 }
 379
 380                 opcode = &mono_opcodes [i];
 381                 switch (opcode->flow_type) {
 382                 case MONO_FLOW_RETURN:
 383                         link_bblock (bb, end_bb);
 384                 case MONO_FLOW_ERROR:
 385                         block_end = 1;
 386                         break;
 387                 case MONO_FLOW_BRANCH: /* we handle branch when checking the argument type */
 388                 case MONO_FLOW_COND_BRANCH:
 389                 case MONO_FLOW_CALL:
 390                 case MONO_FLOW_NEXT:
 391                 case MONO_FLOW_META:
 392                         break;
 393                 default:
 394                         g_assert_not_reached ();
 395                 }
 396                 switch (opcode->argument) {
 397                 case MonoInlineNone:
 398                         ++ip;
 399                         break;
 400                 case MonoInlineType:
 401                 case MonoInlineField:
 402                 case MonoInlineMethod:
 403                 case MonoInlineTok:
 404                 case MonoInlineString:
 405                 case MonoInlineSig:
 406                 case MonoShortInlineR:
 407                 case MonoInlineI:
 408                         ip += 5;
 409                         break;
 410                 case MonoInlineVar:
 411                         ip += 3;
 412                         break;
 413                 case MonoShortInlineVar:
 414                 case MonoShortInlineI:
 415                         ip += 2;
 416                         break;
 417                 case MonoShortInlineBrTarget:
 418                 case MonoInlineBrTarget:
 419                         ip++;
 420                         if (opcode->argument == MonoShortInlineBrTarget) {
 421                                 i = (signed char)*ip;
 422                                 ip++;
 423                         } else {
 424                                 i = (gint32) read32 (ip);
 425                                 ip += 4;
 426                         }
 427                         if (opcode->flow_type == MONO_FLOW_COND_BRANCH) {
 428                                 if (!(target = g_hash_table_lookup (table, ip))) {
 429                                         target = g_new0 (MonoBasicBlock, 1);
 430                                         target->cil_code = ip;
 431                                         g_ptr_array_add (result, target);
 432                                         g_hash_table_insert (table, (char*)ip, target);
 433                                 }
 434                                 link_bblock (bb, target);
 435                         }
 436                         if (!(target = g_hash_table_lookup (table, ip + i))) {
 437                                 target = g_new0 (MonoBasicBlock, 1);
 438                                 target->cil_code = ip + i;
 439                                 g_ptr_array_add (result, target);
 440                                 g_hash_table_insert (table, (char*)ip + i, target);
 441                         }
 442                         link_bblock (bb, target);
 443                         block_end = 1;
 444                         break;
 445                 case MonoInlineSwitch: {
 446                         gint32 n;
 447                         char *itarget, *st;
 448                         ++ip;
 449                         n = read32 (ip);
 450                         ip += 4;
 451                         st = (char*)ip + 4 * n;
 452
 453                         for (i = 0; i < n; i++) {
 454                                 itarget = st + read32 (ip);
 455                                 ip += 4;
 456                                 if (!(target = g_hash_table_lookup (table, itarget))) {
 457                                         target = g_new0 (MonoBasicBlock, 1);
 458                                         target->cil_code = itarget;
 459                                         g_ptr_array_add (result, target);
 460                                         g_hash_table_insert (table, itarget, target);
 461                                 }
 462                                 link_bblock (bb, target);
 463                         }
 464                         /*
 465                          * Note: the code didn't set block_end in switch.
 466                          */
 467                         break;
 468                 }
 469                 case MonoInlineR:
 470                 case MonoInlineI8:
 471                         ip += 9;
 472                         break;
 473                 default:
 474                         g_assert_not_reached ();
 475                 }
 476
 477         }
 478         g_hash_table_destroy (table);
 479         qsort (result->pdata, result->len, sizeof (gpointer), compare_bblock);
 480         /* skip entry and end */
 481         bb = target = NULL;
 482         for (i = 2; i < result->len; ++i) {
 483                 bb = (MonoBasicBlock*)g_ptr_array_index (result, i);
 484                 if (target)
 485                         target->cil_length = bb->cil_code - target->cil_code;
 486                 target = bb;
 487                 /*fprintf (stderr, "bblock %d at IL_%04x:\n", i, bb->cil_code - header->code);*/
 488         }
 489         bb->cil_length = header->code + header->code_size - bb->cil_code;
 490         return result;
 491 }
 492
 493 static char*
 494 indenter (MonoDisHelper *dh, MonoMethod *method, guint32 ip_offset)
 495 {
 496         return g_strdup (" ");
 497 }
 498
 499 static MonoDisHelper graph_dh = {
 500         "\\l",
 501         NULL,
 502         "IL_%04x",
 503         indenter,
 504         NULL,
 505         NULL
 506 };
 507
 508 static void
 509 df_visit (MonoBasicBlock *bb, int *dfn, const unsigned char* code)
 510 {
 511         GList *tmp;
 512         MonoBasicBlock *next;
 513
 514         if (bb->dfn)
 515                 return;
 516         ++(*dfn);
 517         bb->dfn = *dfn;
 518         for (tmp = bb->out_bb; tmp; tmp = tmp->next) {
 519                 next = tmp->data;
 520                 if (!next->dfn) {
 521                         if (!bb->cil_code)
 522                                 fprintf (output, "\t\"DF entry\" -> \"IL_%04x (%d)\"\n", next->cil_code - code, *dfn + 1);
 523                         else
 524                                 fprintf (output, "\t\"IL_%04x (%d)\" -> \"IL_%04x (%d)\"\n", bb->cil_code - code, bb->dfn, next->cil_code - code, *dfn + 1);
 525                         df_visit (next, dfn, code);
 526                 }
 527         }
 528 }
 529
 530 static void
 531 print_method_cfg (MonoMethod *method) {
 532         GPtrArray *bblocks;
 533         GList *tmp;
 534         MonoBasicBlock *bb, *target;
 535         MonoMethodHeader *header;
 536         int i, dfn;
 537         char *code;
 538
 539         header = ((MonoMethodNormal*)method)->header;
 540         bblocks = mono_method_find_bblocks (header);
 541         for (i = 0; i < bblocks->len; ++i) {
 542                 bb = (MonoBasicBlock*)g_ptr_array_index (bblocks, i);
 543                 if (i == 0)
 544                         fprintf (output, "\tB%p [shape=record,label=\"entry\"]\n", bb);
 545                 else if (i == 1)
 546                         fprintf (output, "\tB%p [shape=record,label=\"end\"]\n", bb);
 547                 else {
 548                         code = mono_disasm_code (&graph_dh, method, bb->cil_code, bb->cil_code + bb->cil_length);
 549                         fprintf (output, "\tB%p [shape=record,label=\"IL_%04x\\n%s\"]\n", bb, bb->cil_code - header->code, code);
 550                         g_free (code);
 551                 }
 552         }
 553         for (i = 0; i < bblocks->len; ++i) {
 554                 bb = (MonoBasicBlock*)g_ptr_array_index (bblocks, i);
 555                 for (tmp = bb->out_bb; tmp; tmp = tmp->next) {
 556                         target = tmp->data;
 557                         fprintf (output, "\tB%p -> B%p\n", bb, target);
 558                 }
 559         }
 560 #if 0
 561         for (i = 0; i < bblocks->len; ++i) {
 562                 bb = (MonoBasicBlock*)g_ptr_array_index (bblocks, i);
 563                 bb->dfn = 0;
 564         }
 565         dfn = 0;
 566         for (i = 0; i < bblocks->len; ++i) {
 567                 bb = (MonoBasicBlock*)g_ptr_array_index (bblocks, i);
 568                 df_visit (bb, &dfn, header->code);
 569         }
 570 #endif
 571 }
 572
 573 /*
 574  * TODO: change to create the DF tree, dominance relation etc.
 575  */
 576 static void
 577 method_cfg (MonoImage *image, char *name) {
 578         MonoMethod *method = NULL;
 579         static char *cfg_graph_properties = "\tnode [fontsize=8.0]\n\tedge [len=1.5,color=red]\n";
 580
 581         if (!name) {
 582                 guint32 token = ((MonoCLIImageInfo*)image->image_info)->cli_cli_header.ch_entry_point;
 583                 if (!token || !(method = mono_get_method (image, token, NULL))) {
 584                         g_print ("Cannot find entry point in %s: specify an explict method name.\n", image->name);
 585                         exit (1);
 586                 }
 587         } else {
 588                 /* search the method */
 589                 MonoMethodDesc *desc;
 590
 591                 desc = mono_method_desc_new (name, include_namespace);
 592                 if (!desc) {
 593                         g_print ("Invalid method name %s\n", name);
 594                         exit (1);
 595                 }
 596                 method = mono_method_desc_search_in_image (desc, image);
 597                 if (!method) {
 598                         g_print ("Cannot find method %s\n", name);
 599                         exit (1);
 600                 }
 601         }
 602         fprintf (output, "digraph blah {\n");
 603         fprintf (output, "%s", cfg_graph_properties);
 604
 605         print_method_cfg (method);
 606
 607         fprintf (output, "}\n");
 608 }
 609
 610 static void
 611 usage () {
 612         printf ("monograph 0.2 Copyright (c) 2002 Ximian, Inc\n");
 613         printf ("Create call graph or type hierarchy information from CIL assemblies.\n");
 614         printf ("Usage: monograph [options] [assembly [typename|methodname]]\n");
 615         printf ("Valid options are:\n");
 616         printf ("\t-c|--call             output call graph instead of type hierarchy\n");
 617         printf ("\t-C|--control-flow     output control flow of methodname\n");
 618         printf ("\t-d|--depth num        max depth recursion (default: 6)\n");
 619         printf ("\t-o|--output filename  write graph to file filename (default: stdout)\n");
 620         printf ("\t-f|--fullname         include namespace in type and method names\n");
 621         printf ("\t-n|--neato            invoke neato directly\n");
 622         printf ("\t-v|--verbose          verbose operation\n");
 623         printf ("The default assembly is corlib.dll. The default method for\n");
 624         printf ("the --call and --control-flow options is the entrypoint.\n");
 625         printf ("When the --neato option is used the output type info is taken\n");
 626         printf ("from the output filename extension. You need the graphviz package installed\n");
 627         printf ("to be able to use this option.\n");
 628         printf ("Sample runs:\n");
 629         printf ("\tmonograph -n -o vt.png corlib.dll System.ValueType\n");
 630         printf ("\tmonograph -n -o expr.png mcs.exe Mono.CSharp.Expression\n");
 631         printf ("\tmonograph -n -o cfg.png -C mcs.exe Driver:Main\n");
 632         printf ("\tmonograph -d 3 -n -o callgraph.png -c mis.exe\n");
 633         exit (1);
 634 }
 635
 636 enum {
 637         GRAPH_TYPES,
 638         GRAPH_CALL,
 639         GRAPH_INTERFACE,
 640         GRAPH_CONTROL_FLOW
 641 };
 642
 643 /*
 644  * TODO:
 645  * * virtual method calls as explained above
 646  * * maybe track field references
 647  * * track what exceptions a method could throw?
 648  * * for some inputs neato appears to hang or take a long time: kill it?
 649  * * allow passing additional command-line arguments to neato
 650  * * allow setting different graph/node/edge options directly
 651  * * option to avoid specialname methods
 652  * * make --neato option the default?
 653  * * use multiple classes/method roots?
 654  * * write a manpage
 655  * * reverse call graph: given a method what methods call it?
 656  */
 657 int
 658 main (int argc, char *argv[]) {
 659         MonoAssembly *assembly;
 660         char *cname = NULL;
 661         char *aname = NULL;
 662         char *outputfile = NULL;
 663         int graphtype = GRAPH_TYPES;
 664         int callneato = 0;
 665         int i;
 666
 667         mono_init (argv [0]);
 668         output = stdout;
 669
 670         for (i = 1; i < argc; ++i) {
 671                 if (argv [i] [0] != '-')
 672                         break;
 673                 if (strcmp (argv [i], "--call") == 0 || strcmp (argv [i], "-c") == 0) {
 674                         graphtype = GRAPH_CALL;
 675                 } else if (strcmp (argv [i], "--control-flow") == 0 || strcmp (argv [i], "-C") == 0) {
 676                         graphtype = GRAPH_CONTROL_FLOW;
 677                 } else if (strcmp (argv [i], "--interface") == 0 || strcmp (argv [i], "-i") == 0) {
 678                         graphtype = GRAPH_INTERFACE;
 679                 } else if (strcmp (argv [i], "--fullname") == 0 || strcmp (argv [i], "-f") == 0) {
 680                         include_namespace = 1;
 681                 } else if (strcmp (argv [i], "--neato") == 0 || strcmp (argv [i], "-n") == 0) {
 682                         callneato = 1;
 683                 } else if (strcmp (argv [i], "--verbose") == 0 || strcmp (argv [i], "-v") == 0) {
 684                         verbose++;
 685                 } else if (strcmp (argv [i], "--output") == 0 || strcmp (argv [i], "-o") == 0) {
 686                         if (i + 1 >= argc)
 687                                 usage ();
 688                         outputfile = argv [++i];
 689                 } else if (strcmp (argv [i], "--depth") == 0 || strcmp (argv [i], "-d") == 0) {
 690                         if (i + 1 >= argc)
 691                                 usage ();
 692                         max_depth = atoi (argv [++i]);
 693                 } else {
 694                         usage ();
 695                 }
 696
 697         }
 698         if (argc > i)
 699                 aname = argv [i];
 700         if (argc > i + 1)
 701                 cname = argv [i + 1];
 702         if (!aname)
 703                 aname = "corlib.dll";
 704         if (!cname && (graphtype == GRAPH_TYPES))
 705                 cname = "System.Object";
 706
 707         assembly = mono_assembly_open (aname, NULL, NULL);
 708         if (!assembly) {
 709                 g_print ("cannot open assembly %s\n", aname);
 710                 exit (1);
 711         }
 712
 713         if (callneato) {
 714                 GString *command = g_string_new ("neato");
 715                 char *type = NULL;
 716
 717                 if (outputfile) {
 718                         type = strrchr (outputfile, '.');
 719                         g_string_sprintfa (command, " -o %s", outputfile);
 720                 }
 721                 if (type)
 722                         g_string_sprintfa (command, " -T%s", type + 1);
 723                 output = popen (command->str, "w");
 724                 if (!output) {
 725                         g_print ("Cannot run neato: you may need to install the graphviz package.\n");
 726                         exit (1);
 727                 }
 728         } else if (outputfile) {
 729                 output = fopen (outputfile, "w");
 730                 if (!output) {
 731                         g_print ("Cannot open file: %s\n", outputfile);
 732                         exit (1);
 733                 }
 734         }
 735         /* if it looks like a method name, we want a callgraph. */
 736         if (cname && strchr (cname, ':') && graphtype == GRAPH_TYPES)
 737                 graphtype = GRAPH_CALL;
 738
 739         switch (graphtype) {
 740         case GRAPH_TYPES:
 741                 type_graph (assembly->image, cname);
 742                 break;
 743         case GRAPH_CALL:
 744                 method_graph (assembly->image, cname);
 745                 break;
 746         case GRAPH_INTERFACE:
 747                 interface_graph (assembly->image, cname);
 748                 break;
 749         case GRAPH_CONTROL_FLOW:
 750                 method_cfg (assembly->image, cname);
 751                 break;
 752         default:
 753                 g_error ("wrong graph type");
 754         }
 755
 756         if (callneato) {
 757                 if (verbose)
 758                         g_print ("waiting for neato.\n");
 759                 pclose (output);
 760         } else if (outputfile)
 761                 fclose (output);
 762         return 0;
 763 }
 764
 765