mono/dis/dis-cil.c

   1 /*
   2  * dis-cil.c: Disassembles CIL byte codes
   3  *
   4  * Author:
   5  *   Miguel de Icaza (miguel@ximian.com)
   6  *
   7  * (C) 2001 Ximian, Inc.
   8  */
   9 #include <config.h>
  10 #include <glib.h>
  11 #include <stdio.h>
  12 #include <math.h>
  13 #ifdef  HAVE_WCHAR_H
  14 #include <wchar.h>
  15 #endif
  16 #include "meta.h"
  17 #include "get.h"
  18 #include "dump.h"
  19 #include "dis-cil.h"
  20 #include "mono/metadata/opcodes.h"
  21 #include "mono/utils/mono-compiler.h"
  22
  23 #ifndef HAVE_ISINF
  24
  25 #ifdef HAVE_IEEEFP_H
  26 #include <ieeefp.h>
  27 int isinf (double);
  28 int
  29 isinf (double num)
  30 {
  31         fpclass_t klass;
  32
  33         klass = fpclass (num);
  34         if (klass == FP_NINF)
  35                 return -1;
  36
  37         if (klass == FP_PINF)
  38                 return 1;
  39
  40         return 0;
  41 }
  42 #else
  43 #error "Don't know how to implement isinf for this platform."
  44 #endif
  45
  46 #endif
  47
  48 #define CODE_INDENT g_assert (indent_level < 512); \
  49         indent[indent_level*2] = ' ';   \
  50         indent[indent_level*2+1] = ' '; \
  51         ++indent_level; \
  52         indent[indent_level*2] = 0;
  53 #define CODE_UNINDENT g_assert (indent_level);  \
  54         --indent_level; \
  55         indent[indent_level*2] = 0;
  56
  57 void
  58 dissasemble_cil (MonoImage *m, MonoMethodHeader *mh, MonoGenericContext *context)
  59 {
  60         const unsigned char *start = mh->code;
  61         int size = mh->code_size;
  62         const unsigned char *end = start + size;
  63         const unsigned char *ptr = start;
  64         const MonoOpcode *entry;
  65         char indent[1024];
  66         int i, indent_level = 0;
  67         gboolean in_fault = 0;
  68         const char *clause_names[] = {"catch", "filter", "finally", "", "fault"};
  69         gboolean *trys = NULL;
  70         indent [0] = 0;
  71
  72 #ifdef DEBUG
  73         for (i = 0; i < mh->num_clauses; ++i) {
  74 #define clause mh->clauses [i]
  75                g_print ("/* out clause %d: from %d len=%d, handler at %d, %d */\n",
  76                         clause.flags, clause.try_offset, clause.try_len, clause.handler_offset, clause.handler_len);
  77 #undef clause
  78         }
  79 #endif
  80
  81        if (mh->num_clauses) {
  82                trys = g_malloc0 (sizeof (gboolean) * mh->num_clauses);
  83                trys [0] = 1;
  84                for (i=1; i < mh->num_clauses; ++i) {
  85 #define pcl mh->clauses [i-1]
  86 #define cl mh->clauses [i]
  87                        if (pcl.try_offset != cl.try_offset || pcl.try_len != cl.try_len)
  88                                trys [i] = 1;
  89 #undef pcl
  90 #undef cl
  91                }
  92        }
  93
  94         while (ptr < end){
  95                 for (i = mh->num_clauses - 1; i >= 0 ; --i) {
  96                         if (ptr == start + mh->clauses[i].try_offset && trys [i]) {
  97                                 fprintf (output, "\t%s.try { // %d\n", indent, i);
  98                                 CODE_INDENT;
  99                         }
 100
 101                         if (ptr == start + mh->clauses[i].handler_offset) {
 102                                 if (mh->clauses[i].flags == MONO_EXCEPTION_CLAUSE_FILTER) {
 103                                         CODE_UNINDENT;
 104                                         fprintf (output, "\t%s} { // %d\n", indent, i);
 105                                 } else {
 106                                         char * klass = mh->clauses[i].flags ? g_strdup ("") :
 107                                                 dis_stringify_object_with_class (m, mh->clauses[i].data.catch_class,
 108                                                                                  FALSE, FALSE);
 109                                         fprintf (output, "\t%s%s %s { // %d\n", indent,
 110                                                         clause_names [mh->clauses[i].flags], klass, i);
 111                                         g_free (klass);
 112                                 }
 113                                 CODE_INDENT;
 114                                 if (mh->clauses[i].flags == MONO_EXCEPTION_CLAUSE_FAULT)
 115                                         in_fault = 1;
 116                         }
 117                         if (mh->clauses[i].flags == MONO_EXCEPTION_CLAUSE_FILTER && ptr == start + mh->clauses[i].data.filter_offset) {
 118                                 fprintf (output, "\t%s%s {\n", indent, clause_names[1]);
 119                                 CODE_INDENT;
 120                         }
 121                 }
 122                 fprintf (output, "\t%sIL_%04x: ", indent, (int) (ptr - start));
 123                 i = *ptr;
 124                 if (*ptr == 0xfe){
 125                         ptr++;
 126                         i = *ptr + 256;
 127                 }
 128                 entry = &mono_opcodes [i];
 129
 130                 if (in_fault && entry->opval == 0xDC)
 131                         fprintf (output, " %s", "endfault");
 132                 else
 133                         fprintf (output, " %s ", mono_opcode_name (i));
 134                 ptr++;
 135                 switch (entry->argument){
 136                 case MonoInlineBrTarget: {
 137                         gint target = read32 (ptr);
 138                         fprintf (output, "IL_%04x\n", ((int) (ptr - start)) + 4 + target);
 139                         ptr += 4;
 140                         break;
 141                 }
 142
 143                 case MonoInlineField: {
 144                         guint32 token = read32 (ptr);
 145                         char *s;
 146
 147                         s = get_field (m, token, context);
 148                         fprintf (output, "%s", s);
 149                         g_free (s);
 150                         ptr += 4;
 151                         break;
 152                 }
 153
 154                 case MonoInlineI: {
 155                         int value = read32 (ptr);
 156
 157                         fprintf (output, "%d", value);
 158                         ptr += 4;
 159                         break;
 160                 }
 161
 162                 case MonoInlineI8: {
 163                         gint64 top = read64 (ptr);
 164
 165                         fprintf (output, "0x%llx", (long long) top);
 166                         ptr += 8;
 167                         break;
 168                 }
 169
 170                 case MonoInlineMethod: {
 171                         guint32 token = read32 (ptr);
 172                         char *s;
 173
 174                         s = get_method (m, token, context);
 175                         fprintf (output, "%s", s);
 176                         g_free (s);
 177                         ptr += 4;
 178                         break;
 179                 }
 180
 181                 case MonoInlineNone:
 182                         break;
 183
 184                 case MonoInlineR: {
 185                         double r;
 186                         int inf;
 187                         readr8 (ptr, &r);
 188                         inf = isinf (r);
 189                         if (inf == -1)
 190                                 fprintf (output, "(00 00 00 00 00 00 f0 ff)"); /* negative infinity */
 191                         else if (inf == 1)
 192                                 fprintf (output, "(00 00 00 00 00 00 f0 7f)"); /* positive infinity */
 193                         else if (isnan (r))
 194                                 fprintf (output, "(00 00 00 00 00 00 f8 ff)"); /* NaN */
 195                         else
 196                                 fprintf (output, "%.20g", r);
 197                         ptr += 8;
 198                         break;
 199                 }
 200
 201                 case MonoInlineSig: {
 202                         guint32 token = read32 (ptr);
 203                         fprintf (output, "signature-0x%08x", token);
 204                         ptr += 4;
 205                         break;
 206                 }
 207
 208                 case MonoInlineString: {
 209                         guint32 token = read32 (ptr);
 210                         const char *us_ptr = mono_metadata_user_string (m, token & 0xffffff);
 211                         int len = mono_metadata_decode_blob_size (us_ptr, (const char**)&us_ptr);
 212
 213                         char *s = get_encoded_user_string_or_bytearray (us_ptr, len);
 214
 215                         /*
 216                          * See section 23.1.4 on the encoding of the #US heap
 217                          */
 218                         fprintf (output, "%s", s);
 219                         g_free (s);
 220                         ptr += 4;
 221                         break;
 222                 }
 223
 224                 case MonoInlineSwitch: {
 225                         guint32 count = read32 (ptr);
 226                         const unsigned char *endswitch;
 227                         guint32 n;
 228
 229                         ptr += 4;
 230                         endswitch = ptr + sizeof (guint32) * count;
 231                         fprintf (output, count > 0 ? "(\n" : "( )");
 232                         CODE_INDENT;
 233                         for (n = 0; n < count; n++){
 234                                 fprintf (output, "\t%sIL_%04x%s", indent,
 235                                                  (int)(endswitch-start+read32 (ptr)),
 236                                                  n == count - 1 ? ")" : ",\n");
 237                                 ptr += 4;
 238                         }
 239                         CODE_UNINDENT;
 240                         break;
 241                 }
 242
 243                 case MonoInlineTok: {
 244                         guint32 token = read32 (ptr);
 245                         char *s;
 246
 247                         s = get_token (m, token, context);
 248                         fprintf (output, "%s", s);
 249                         g_free (s);
 250
 251                         ptr += 4;
 252                         break;
 253                 }
 254
 255                 case MonoInlineType: {
 256                         guint32 token = read32 (ptr);
 257                         char *s = get_token_type (m, token, context);
 258                         fprintf (output, "%s", s);
 259                         g_free (s);
 260                         ptr += 4;
 261                         break;
 262                 }
 263
 264                 case MonoInlineVar: {
 265                         guint16 var_idx = read16 (ptr);
 266
 267                         fprintf (output, "%d\n", var_idx);
 268                         ptr += 2;
 269                         break;
 270                 }
 271
 272                 case MonoShortInlineBrTarget: {
 273                         signed char x = *ptr;
 274
 275                         fprintf (output, "IL_%04x\n", (int)(ptr - start + 1 + x));
 276                         ptr++;
 277                         break;
 278                 }
 279
 280                 case MonoShortInlineI: {
 281                         char x = *ptr;
 282
 283                         fprintf (output, "0x%02x", x);
 284                         ptr++;
 285                         break;
 286                 }
 287
 288                 case MonoShortInlineR: {
 289                         float f;
 290                         int inf;
 291
 292                         readr4 (ptr, &f);
 293
 294                         inf = isinf (f);
 295                         if (inf == -1)
 296                                 fprintf (output, "(00 00 80 ff)"); /* negative infinity */
 297                         else if (inf == 1)
 298                                 fprintf (output, "(00 00 80 7f)"); /* positive infinity */
 299                         else if (isnan (f))
 300                                 fprintf (output, "(00 00 c0 ff)"); /* NaN */
 301                         else
 302                                 fprintf (output, "%.20g", (double) f);
 303                         ptr += 4;
 304                         break;
 305                 }
 306
 307                 case MonoShortInlineVar: {
 308                         unsigned char x = *ptr;
 309
 310                         fprintf (output, "%d", (int) x);
 311                         ptr++;
 312                         break;
 313                 }
 314                 default:
 315                         break;
 316                 }
 317
 318                 fprintf (output, "\n");
 319                 for (i = 0; i < mh->num_clauses; ++i) {
 320                         if (ptr == start + mh->clauses[i].try_offset + mh->clauses[i].try_len && trys [i]) {
 321                                 CODE_UNINDENT;
 322                                 fprintf (output, "\t%s} // end .try %d\n", indent, i);
 323                         }
 324                         if (ptr == start + mh->clauses[i].handler_offset + mh->clauses[i].handler_len) {
 325                                 CODE_UNINDENT;
 326                                 fprintf (output, "\t%s} // end handler %d\n", indent, i);
 327                                 if (mh->clauses[i].flags == MONO_EXCEPTION_CLAUSE_FAULT)
 328                                         in_fault = 0;
 329                         }
 330                 }
 331         }
 332         if (trys)
 333                 g_free (trys);
 334 }