mono/mini/dwarfwriter.c

   1 /*
   2  * dwarfwriter.c: Creation of DWARF debug information
   3  *
   4  * Author:
   5  *   Zoltan Varga (vargaz@gmail.com)
   6  *
   7  * (C) 2008-2009 Novell, Inc.
   8  */
   9
  10 #include "config.h"
  11
  12 #if !defined(DISABLE_AOT) && !defined(DISABLE_JIT)
  13 #include "dwarfwriter.h"
  14
  15 #include <sys/types.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #ifdef HAVE_STDINT_H
  19 #include <stdint.h>
  20 #endif
  21
  22 #include <mono/metadata/mono-endian.h>
  23 #include <mono/metadata/debug-mono-symfile.h>
  24 #include <mono/metadata/mono-debug-debugger.h>
  25 #include <mono/utils/mono-compiler.h>
  26
  27 #ifndef HOST_WIN32
  28 #include <mono/utils/freebsd-elf32.h>
  29 #include <mono/utils/freebsd-elf64.h>
  30 #endif
  31
  32 #include <mono/utils/freebsd-dwarf.h>
  33
  34 #define DW_AT_MIPS_linkage_name 0x2007
  35 #define DW_LNE_set_prologue_end 0x0a
  36
  37 typedef struct {
  38         MonoMethod *method;
  39         char *start_symbol, *end_symbol;
  40         guint8 *code;
  41         guint32 code_size;
  42 } MethodLineNumberInfo;
  43
  44 struct _MonoDwarfWriter
  45 {
  46         MonoImageWriter *w;
  47         GHashTable *class_to_die, *class_to_vtype_die, *class_to_pointer_die;
  48         GHashTable *class_to_reference_die;
  49         int fde_index, tdie_index, line_number_file_index, line_number_dir_index;
  50         GHashTable *file_to_index, *index_to_file, *dir_to_index;
  51         FILE *il_file;
  52         int il_file_line_index, loclist_index;
  53         GSList *cie_program;
  54         FILE *fp;
  55         const char *temp_prefix;
  56         gboolean emit_line;
  57         GSList *line_info;
  58         int cur_file_index;
  59 };
  60
  61 static void
  62 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
  63                                            char *start_symbol, char *end_symbol,
  64                                            guint8 *code, guint32 code_size,
  65                                            MonoDebugMethodJitInfo *debug_info);
  66
  67 /*
  68  * mono_dwarf_writer_create:
  69  *
  70  *   Create a DWARF writer object. WRITER is the underlying image writer this
  71  * writer will emit to. IL_FILE is the file where IL code will be dumped to for
  72  * methods which have no line number info. It can be NULL.
  73  */
  74 MonoDwarfWriter*
  75 mono_dwarf_writer_create (MonoImageWriter *writer, FILE *il_file, int il_file_start_line, gboolean emit_line_numbers)
  76 {
  77         MonoDwarfWriter *w = g_new0 (MonoDwarfWriter, 1);
  78
  79         w->w = writer;
  80         w->il_file = il_file;
  81         w->il_file_line_index = il_file_start_line;
  82
  83         w->emit_line = emit_line_numbers;
  84
  85         w->fp = mono_img_writer_get_fp (w->w);
  86         w->temp_prefix = mono_img_writer_get_temp_label_prefix (w->w);
  87
  88         w->class_to_die = g_hash_table_new (NULL, NULL);
  89         w->class_to_vtype_die = g_hash_table_new (NULL, NULL);
  90         w->class_to_pointer_die = g_hash_table_new (NULL, NULL);
  91         w->class_to_reference_die = g_hash_table_new (NULL, NULL);
  92         w->cur_file_index = -1;
  93
  94         return w;
  95 }
  96
  97 void
  98 mono_dwarf_writer_destroy (MonoDwarfWriter *w)
  99 {
 100         g_free (w);
 101 }
 102
 103 int
 104 mono_dwarf_writer_get_il_file_line_index (MonoDwarfWriter *w)
 105 {
 106         return w->il_file_line_index;
 107 }
 108
 109 /* Wrappers around the image writer functions */
 110
 111 static inline void
 112 emit_section_change (MonoDwarfWriter *w, const char *section_name, int subsection_index)
 113 {
 114         mono_img_writer_emit_section_change (w->w, section_name, subsection_index);
 115 }
 116
 117 static inline void
 118 emit_push_section (MonoDwarfWriter *w, const char *section_name, int subsection)
 119 {
 120         mono_img_writer_emit_push_section (w->w, section_name, subsection);
 121 }
 122
 123 static inline void
 124 emit_pop_section (MonoDwarfWriter *w)
 125 {
 126         mono_img_writer_emit_pop_section (w->w);
 127 }
 128
 129 static inline void
 130 emit_label (MonoDwarfWriter *w, const char *name)
 131 {
 132         mono_img_writer_emit_label (w->w, name);
 133 }
 134
 135 static inline void
 136 emit_bytes (MonoDwarfWriter *w, const guint8* buf, int size)
 137 {
 138         mono_img_writer_emit_bytes (w->w, buf, size);
 139 }
 140
 141 static inline void
 142 emit_string (MonoDwarfWriter *w, const char *value)
 143 {
 144         mono_img_writer_emit_string (w->w, value);
 145 }
 146
 147 static inline void
 148 emit_line (MonoDwarfWriter *w)
 149 {
 150         mono_img_writer_emit_line (w->w);
 151 }
 152
 153 static inline void
 154 emit_alignment (MonoDwarfWriter *w, int size)
 155 {
 156         mono_img_writer_emit_alignment (w->w, size);
 157 }
 158
 159 static inline void
 160 emit_pointer_unaligned (MonoDwarfWriter *w, const char *target)
 161 {
 162         mono_img_writer_emit_pointer_unaligned (w->w, target);
 163 }
 164
 165 static inline void
 166 emit_pointer (MonoDwarfWriter *w, const char *target)
 167 {
 168         mono_img_writer_emit_pointer (w->w, target);
 169 }
 170
 171 static inline void
 172 emit_int16 (MonoDwarfWriter *w, int value)
 173 {
 174         mono_img_writer_emit_int16 (w->w, value);
 175 }
 176
 177 static inline void
 178 emit_int32 (MonoDwarfWriter *w, int value)
 179 {
 180         mono_img_writer_emit_int32 (w->w, value);
 181 }
 182
 183 static inline void
 184 emit_symbol_diff (MonoDwarfWriter *w, const char *end, const char* start, int offset)
 185 {
 186         mono_img_writer_emit_symbol_diff (w->w, end, start, offset);
 187 }
 188
 189 static inline void
 190 emit_byte (MonoDwarfWriter *w, guint8 val)
 191 {
 192         mono_img_writer_emit_byte (w->w, val);
 193 }
 194
 195 static void
 196 emit_escaped_string (MonoDwarfWriter *w, char *value)
 197 {
 198         int i, len;
 199
 200         len = strlen (value);
 201         for (i = 0; i < len; ++i) {
 202                 char c = value [i];
 203                 if (!(isalnum (c))) {
 204                         switch (c) {
 205                         case '_':
 206                         case '-':
 207                         case ':':
 208                         case '.':
 209                         case ',':
 210                         case '/':
 211                         case '<':
 212                         case '>':
 213                         case '`':
 214                         case '(':
 215                         case ')':
 216                         case '[':
 217                         case ']':
 218                                 break;
 219                         default:
 220                                 value [i] = '_';
 221                                 break;
 222                         }
 223                 }
 224         }
 225         mono_img_writer_emit_string (w->w, value);
 226 }
 227
 228 static G_GNUC_UNUSED void
 229 emit_uleb128 (MonoDwarfWriter *w, guint32 value)
 230 {
 231         do {
 232                 guint8 b = value & 0x7f;
 233                 value >>= 7;
 234                 if (value != 0) /* more bytes to come */
 235                         b |= 0x80;
 236                 emit_byte (w, b);
 237         } while (value);
 238 }
 239
 240 static G_GNUC_UNUSED void
 241 emit_sleb128 (MonoDwarfWriter *w, gint64 value)
 242 {
 243         gboolean more = 1;
 244         gboolean negative = (value < 0);
 245         guint32 size = 64;
 246         guint8 byte;
 247
 248         while (more) {
 249                 byte = value & 0x7f;
 250                 value >>= 7;
 251                 /* the following is unnecessary if the
 252                  * implementation of >>= uses an arithmetic rather
 253                  * than logical shift for a signed left operand
 254                  */
 255                 if (negative)
 256                         /* sign extend */
 257                         value |= - ((gint64)1 <<(size - 7));
 258                 /* sign bit of byte is second high order bit (0x40) */
 259                 if ((value == 0 && !(byte & 0x40)) ||
 260                         (value == -1 && (byte & 0x40)))
 261                         more = 0;
 262                 else
 263                         byte |= 0x80;
 264                 emit_byte (w, byte);
 265         }
 266 }
 267
 268 static G_GNUC_UNUSED void
 269 encode_uleb128 (guint32 value, guint8 *buf, guint8 **endbuf)
 270 {
 271         guint8 *p = buf;
 272
 273         do {
 274                 guint8 b = value & 0x7f;
 275                 value >>= 7;
 276                 if (value != 0) /* more bytes to come */
 277                         b |= 0x80;
 278                 *p ++ = b;
 279         } while (value);
 280
 281         *endbuf = p;
 282 }
 283
 284 static G_GNUC_UNUSED void
 285 encode_sleb128 (gint32 value, guint8 *buf, guint8 **endbuf)
 286 {
 287         gboolean more = 1;
 288         gboolean negative = (value < 0);
 289         guint32 size = 32;
 290         guint8 byte;
 291         guint8 *p = buf;
 292
 293         while (more) {
 294                 byte = value & 0x7f;
 295                 value >>= 7;
 296                 /* the following is unnecessary if the
 297                  * implementation of >>= uses an arithmetic rather
 298                  * than logical shift for a signed left operand
 299                  */
 300                 if (negative)
 301                         /* sign extend */
 302                         value |= - (1 <<(size - 7));
 303                 /* sign bit of byte is second high order bit (0x40) */
 304                 if ((value == 0 && !(byte & 0x40)) ||
 305                         (value == -1 && (byte & 0x40)))
 306                         more = 0;
 307                 else
 308                         byte |= 0x80;
 309                 *p ++= byte;
 310         }
 311
 312         *endbuf = p;
 313 }
 314
 315 static void
 316 emit_dwarf_abbrev (MonoDwarfWriter *w, int code, int tag, gboolean has_child,
 317                                    int *attrs, int attrs_len)
 318 {
 319         int i;
 320
 321         emit_uleb128 (w, code);
 322         emit_uleb128 (w, tag);
 323         emit_byte (w, has_child);
 324
 325         for (i = 0; i < attrs_len; i++)
 326                 emit_uleb128 (w, attrs [i]);
 327         emit_uleb128 (w, 0);
 328         emit_uleb128 (w, 0);
 329 }
 330
 331 static void
 332 emit_cie (MonoDwarfWriter *w)
 333 {
 334         emit_section_change (w, ".debug_frame", 0);
 335
 336         emit_alignment (w, 8);
 337
 338         /* Emit a CIE */
 339         emit_symbol_diff (w, ".Lcie0_end", ".Lcie0_start", 0); /* length */
 340         emit_label (w, ".Lcie0_start");
 341         emit_int32 (w, 0xffffffff); /* CIE id */
 342         emit_byte (w, 3); /* version */
 343         emit_string (w, ""); /* augmention */
 344         emit_sleb128 (w, 1); /* code alignment factor */
 345         emit_sleb128 (w, mono_unwind_get_dwarf_data_align ()); /* data alignment factor */
 346         emit_uleb128 (w, mono_unwind_get_dwarf_pc_reg ());
 347
 348         w->cie_program = w->cie_program;
 349         if (w->cie_program) {
 350                 guint32 uw_info_len;
 351                 guint8 *uw_info = mono_unwind_ops_encode (w->cie_program, &uw_info_len);
 352                 emit_bytes (w, uw_info, uw_info_len);
 353                 g_free (uw_info);
 354         }
 355
 356         emit_alignment (w, sizeof (gpointer));
 357         emit_label (w, ".Lcie0_end");
 358 }
 359
 360 static void
 361 emit_pointer_value (MonoDwarfWriter *w, gpointer ptr)
 362 {
 363         gssize val = (gssize)ptr;
 364         emit_bytes (w, (guint8*)&val, sizeof (gpointer));
 365 }
 366
 367 static void
 368 emit_fde (MonoDwarfWriter *w, int fde_index, char *start_symbol, char *end_symbol,
 369                   guint8 *code, guint32 code_size, GSList *unwind_ops, gboolean use_cie)
 370 {
 371         char symbol1 [128];
 372         char symbol2 [128];
 373         GSList *l;
 374         guint8 *uw_info;
 375         guint32 uw_info_len;
 376
 377         emit_section_change (w, ".debug_frame", 0);
 378
 379         sprintf (symbol1, ".Lfde%d_start", fde_index);
 380         sprintf (symbol2, ".Lfde%d_end", fde_index);
 381         emit_symbol_diff (w, symbol2, symbol1, 0); /* length */
 382         emit_label (w, symbol1);
 383         emit_int32 (w, 0); /* CIE_pointer */
 384         if (start_symbol) {
 385                 emit_pointer (w, start_symbol); /* initial_location */
 386                 if (end_symbol)
 387                         emit_symbol_diff (w, end_symbol, start_symbol, 0); /* address_range */
 388                 else {
 389                         g_assert (code_size);
 390                         emit_int32 (w, code_size);
 391                 }
 392         } else {
 393                 emit_pointer_value (w, code);
 394                 emit_int32 (w, code_size);
 395         }
 396 #if SIZEOF_VOID_P == 8
 397         /* Upper 32 bits of code size */
 398         emit_int32 (w, 0);
 399 #endif
 400
 401         l = unwind_ops;
 402         if (w->cie_program) {
 403                 // FIXME: Check that the ops really begin with the CIE program */
 404                 int i;
 405
 406                 for (i = 0; i < g_slist_length (w->cie_program); ++i)
 407                         if (l)
 408                                 l = l->next;
 409         }
 410
 411         /* Convert the list of MonoUnwindOps to the format used by DWARF */
 412         uw_info = mono_unwind_ops_encode_full (l, &uw_info_len, FALSE);
 413         emit_bytes (w, uw_info, uw_info_len);
 414         g_free (uw_info);
 415
 416         emit_alignment (w, sizeof (mgreg_t));
 417         emit_label (w, symbol2);
 418 }
 419
 420 /* Abbrevations */
 421 #define ABBREV_COMPILE_UNIT 1
 422 #define ABBREV_SUBPROGRAM 2
 423 #define ABBREV_PARAM 3
 424 #define ABBREV_BASE_TYPE 4
 425 #define ABBREV_STRUCT_TYPE 5
 426 #define ABBREV_DATA_MEMBER 6
 427 #define ABBREV_TYPEDEF 7
 428 #define ABBREV_ENUM_TYPE 8
 429 #define ABBREV_ENUMERATOR 9
 430 #define ABBREV_NAMESPACE 10
 431 #define ABBREV_VARIABLE 11
 432 #define ABBREV_VARIABLE_LOCLIST 12
 433 #define ABBREV_POINTER_TYPE 13
 434 #define ABBREV_REFERENCE_TYPE 14
 435 #define ABBREV_PARAM_LOCLIST 15
 436 #define ABBREV_INHERITANCE 16
 437 #define ABBREV_STRUCT_TYPE_NOCHILDREN 17
 438 #define ABBREV_TRAMP_SUBPROGRAM 18
 439
 440 static int compile_unit_attr [] = {
 441         DW_AT_producer     ,DW_FORM_string,
 442     DW_AT_name         ,DW_FORM_string,
 443     DW_AT_comp_dir     ,DW_FORM_string,
 444         DW_AT_language     ,DW_FORM_data1,
 445     DW_AT_low_pc       ,DW_FORM_addr,
 446     DW_AT_high_pc      ,DW_FORM_addr,
 447         DW_AT_stmt_list    ,DW_FORM_data4
 448 };
 449
 450 static int subprogram_attr [] = {
 451         DW_AT_name         , DW_FORM_string,
 452         DW_AT_MIPS_linkage_name, DW_FORM_string,
 453         DW_AT_decl_file    , DW_FORM_udata,
 454         DW_AT_decl_line    , DW_FORM_udata,
 455 #ifndef TARGET_IOS
 456         DW_AT_description  , DW_FORM_string,
 457 #endif
 458     DW_AT_low_pc       , DW_FORM_addr,
 459     DW_AT_high_pc      , DW_FORM_addr,
 460         DW_AT_frame_base   , DW_FORM_block1
 461 };
 462
 463 static int tramp_subprogram_attr [] = {
 464         DW_AT_name         , DW_FORM_string,
 465     DW_AT_low_pc       , DW_FORM_addr,
 466     DW_AT_high_pc      , DW_FORM_addr,
 467 };
 468
 469 static int param_attr [] = {
 470         DW_AT_name,     DW_FORM_string,
 471         DW_AT_type,     DW_FORM_ref4,
 472         DW_AT_location, DW_FORM_block1
 473 };
 474
 475 static int param_loclist_attr [] = {
 476         DW_AT_name,     DW_FORM_string,
 477         DW_AT_type,     DW_FORM_ref4,
 478         DW_AT_location, DW_FORM_data4
 479 };
 480
 481 static int base_type_attr [] = {
 482         DW_AT_byte_size,   DW_FORM_data1,
 483         DW_AT_encoding,    DW_FORM_data1,
 484         DW_AT_name,        DW_FORM_string
 485 };
 486
 487 static int struct_type_attr [] = {
 488         DW_AT_name,        DW_FORM_string,
 489         DW_AT_byte_size,   DW_FORM_udata,
 490 };
 491
 492 static int data_member_attr [] = {
 493         DW_AT_name,        DW_FORM_string,
 494         DW_AT_type,        DW_FORM_ref4,
 495         DW_AT_data_member_location, DW_FORM_block1
 496 };
 497
 498 static int typedef_attr [] = {
 499         DW_AT_name,        DW_FORM_string,
 500         DW_AT_type,        DW_FORM_ref4
 501 };
 502
 503 static int pointer_type_attr [] = {
 504         DW_AT_type,        DW_FORM_ref4,
 505 };
 506
 507 static int reference_type_attr [] = {
 508         DW_AT_type,        DW_FORM_ref4,
 509 };
 510
 511 static int enum_type_attr [] = {
 512         DW_AT_name,        DW_FORM_string,
 513         DW_AT_byte_size,   DW_FORM_udata,
 514         DW_AT_type,        DW_FORM_ref4,
 515 };
 516
 517 static int enumerator_attr [] = {
 518         DW_AT_name,        DW_FORM_string,
 519         DW_AT_const_value, DW_FORM_sdata,
 520 };
 521
 522 static int namespace_attr [] = {
 523         DW_AT_name,        DW_FORM_string,
 524 };
 525
 526 static int variable_attr [] = {
 527         DW_AT_name,     DW_FORM_string,
 528         DW_AT_type,     DW_FORM_ref4,
 529         DW_AT_location, DW_FORM_block1
 530 };
 531
 532 static int variable_loclist_attr [] = {
 533         DW_AT_name,     DW_FORM_string,
 534         DW_AT_type,     DW_FORM_ref4,
 535         DW_AT_location, DW_FORM_data4
 536 };
 537
 538 static int inheritance_attr [] = {
 539         DW_AT_type,        DW_FORM_ref4,
 540         DW_AT_data_member_location, DW_FORM_block1
 541 };
 542
 543 typedef struct DwarfBasicType {
 544         const char *die_name, *name;
 545         int type;
 546         int size;
 547         int encoding;
 548 } DwarfBasicType;
 549
 550 static DwarfBasicType basic_types [] = {
 551         { ".LDIE_I1", "sbyte", MONO_TYPE_I1, 1, DW_ATE_signed },
 552         { ".LDIE_U1", "byte", MONO_TYPE_U1, 1, DW_ATE_unsigned },
 553         { ".LDIE_I2", "short", MONO_TYPE_I2, 2, DW_ATE_signed },
 554         { ".LDIE_U2", "ushort", MONO_TYPE_U2, 2, DW_ATE_unsigned },
 555         { ".LDIE_I4", "int", MONO_TYPE_I4, 4, DW_ATE_signed },
 556         { ".LDIE_U4", "uint", MONO_TYPE_U4, 4, DW_ATE_unsigned },
 557         { ".LDIE_I8", "long", MONO_TYPE_I8, 8, DW_ATE_signed },
 558         { ".LDIE_U8", "ulong", MONO_TYPE_U8, 8, DW_ATE_unsigned },
 559         { ".LDIE_I", "intptr", MONO_TYPE_I, SIZEOF_VOID_P, DW_ATE_signed },
 560         { ".LDIE_U", "uintptr", MONO_TYPE_U, SIZEOF_VOID_P, DW_ATE_unsigned },
 561         { ".LDIE_R4", "float", MONO_TYPE_R4, 4, DW_ATE_float },
 562         { ".LDIE_R8", "double", MONO_TYPE_R8, 8, DW_ATE_float },
 563         { ".LDIE_BOOLEAN", "boolean", MONO_TYPE_BOOLEAN, 1, DW_ATE_boolean },
 564         { ".LDIE_CHAR", "char", MONO_TYPE_CHAR, 2, DW_ATE_unsigned_char },
 565         { ".LDIE_STRING", "string", MONO_TYPE_STRING, sizeof (gpointer), DW_ATE_address },
 566         { ".LDIE_OBJECT", "object", MONO_TYPE_OBJECT, sizeof (gpointer), DW_ATE_address },
 567         { ".LDIE_SZARRAY", "object", MONO_TYPE_SZARRAY, sizeof (gpointer), DW_ATE_address },
 568 };
 569
 570 /* Constants for encoding line number special opcodes */
 571 #define OPCODE_BASE 13
 572 #define LINE_BASE -5
 573 #define LINE_RANGE 14
 574
 575 /* Subsections of the .debug_line section */
 576 #define LINE_SUBSECTION_HEADER 1
 577 #define LINE_SUBSECTION_INCLUDES 2
 578 #define LINE_SUBSECTION_FILES 3
 579 #define LINE_SUBSECTION_DATA 4
 580 #define LINE_SUBSECTION_END 5
 581
 582 static int
 583 emit_line_number_file_name (MonoDwarfWriter *w, const char *name,
 584                                                         gint64 last_mod_time, gint64 file_size)
 585 {
 586         int index;
 587         int dir_index;
 588         char *basename = NULL;
 589
 590         if (!w->file_to_index)
 591                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 592
 593         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 594         if (index > 0)
 595                 return index;
 596
 597         if (g_path_is_absolute (name)) {
 598                 char *dir = g_path_get_dirname (name);
 599
 600                 if (!w->dir_to_index)
 601                         w->dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 602
 603                 dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (w->dir_to_index, dir));
 604                 if (dir_index == 0) {
 605                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 606                         emit_string (w, dir);
 607
 608                         dir_index = ++ w->line_number_dir_index;
 609                         g_hash_table_insert (w->dir_to_index, g_strdup (dir), GUINT_TO_POINTER (dir_index));
 610                 }
 611
 612                 g_free (dir);
 613
 614                 basename = g_path_get_basename (name);
 615         } else {
 616                 dir_index = 0;
 617         }
 618
 619         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 620
 621         if (basename)
 622                 emit_string (w, basename);
 623         else
 624                 emit_string (w, name);
 625         emit_uleb128 (w, dir_index);
 626         emit_byte (w, 0);
 627         emit_byte (w, 0);
 628
 629         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 630
 631         if (basename)
 632                 g_free (basename);
 633
 634         index = ++ w->line_number_file_index;
 635         g_hash_table_insert (w->file_to_index, g_strdup (name), GUINT_TO_POINTER (index));
 636
 637         return index;
 638 }
 639
 640 static int
 641 get_line_number_file_name (MonoDwarfWriter *w, const char *name)
 642 {
 643         int index;
 644
 645         g_assert (w->file_to_index);
 646         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 647         g_assert (index > 0);
 648         return index - 1;
 649 }
 650
 651 static int
 652 add_line_number_file_name (MonoDwarfWriter *w, const char *name,
 653                                                    gint64 last_mod_time, gint64 file_size)
 654 {
 655         int index;
 656         char *copy;
 657
 658         if (!w->file_to_index) {
 659                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 660                 w->index_to_file = g_hash_table_new (NULL, NULL);
 661         }
 662
 663         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 664         if (index > 0)
 665                 return index - 1;
 666         index = w->line_number_file_index;
 667         w->line_number_file_index ++;
 668         copy = g_strdup (name);
 669         g_hash_table_insert (w->file_to_index, copy, GUINT_TO_POINTER (index + 1));
 670         g_hash_table_insert (w->index_to_file, GUINT_TO_POINTER (index + 1), copy);
 671
 672         return index;
 673 }
 674
 675 char *
 676 mono_dwarf_escape_path (const char *name)
 677 {
 678         if (strchr (name, '\\')) {
 679                 char *s;
 680                 int len, i, j;
 681
 682                 len = strlen (name);
 683                 s = (char *)g_malloc0 ((len + 1) * 2);
 684                 j = 0;
 685                 for (i = 0; i < len; ++i) {
 686                         if (name [i] == '\\') {
 687                                 s [j ++] = '\\';
 688                                 s [j ++] = '\\';
 689                         } else {
 690                                 s [j ++] = name [i];
 691                         }
 692                 }
 693                 return s;
 694         }
 695         return g_strdup (name);
 696 }
 697
 698 static void
 699 emit_all_line_number_info (MonoDwarfWriter *w)
 700 {
 701         int i;
 702         GHashTable *dir_to_index, *index_to_dir;
 703         GSList *l;
 704         GSList *info_list;
 705
 706         add_line_number_file_name (w, "<unknown>", 0, 0);
 707
 708         /* Collect files */
 709         info_list = g_slist_reverse (w->line_info);
 710         for (l = info_list; l; l = l->next) {
 711                 MethodLineNumberInfo *info = (MethodLineNumberInfo *)l->data;
 712                 MonoDebugMethodInfo *minfo;
 713                 GPtrArray *source_file_list;
 714
 715                 // FIXME: Free stuff
 716                 minfo = mono_debug_lookup_method (info->method);
 717                 if (!minfo)
 718                         continue;
 719
 720                 mono_debug_get_seq_points (minfo, NULL, &source_file_list, NULL, NULL, NULL);
 721                 for (i = 0; i < source_file_list->len; ++i) {
 722                         MonoDebugSourceInfo *sinfo = (MonoDebugSourceInfo *)g_ptr_array_index (source_file_list, i);
 723                         add_line_number_file_name (w, sinfo->source_file, 0, 0);
 724                 }
 725         }
 726
 727         /* Preprocess files */
 728         dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 729         index_to_dir = g_hash_table_new (NULL, NULL);
 730         for (i = 0; i < w->line_number_file_index; ++i) {
 731                 char *name = (char *)g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 732                 char *copy;
 733                 int dir_index = 0;
 734
 735                 if (g_path_is_absolute (name)) {
 736                         char *dir = g_path_get_dirname (name);
 737
 738                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 739                         if (dir_index == 0) {
 740                                 dir_index = w->line_number_dir_index;
 741                                 w->line_number_dir_index ++;
 742                                 copy = g_strdup (dir);
 743                                 g_hash_table_insert (dir_to_index, copy, GUINT_TO_POINTER (dir_index + 1));
 744                                 g_hash_table_insert (index_to_dir, GUINT_TO_POINTER (dir_index + 1), copy);
 745                         } else {
 746                                 dir_index --;
 747                         }
 748
 749                         g_free (dir);
 750                 }
 751         }
 752
 753         /* Line number info header */
 754         emit_section_change (w, ".debug_line", 0);
 755         emit_label (w, ".Ldebug_line_section_start");
 756         emit_label (w, ".Ldebug_line_start");
 757         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 758         emit_int16 (w, 0x2); /* version */
 759         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 760         emit_byte (w, 1); /* minimum_instruction_length */
 761         emit_byte (w, 1); /* default_is_stmt */
 762         emit_byte (w, LINE_BASE); /* line_base */
 763         emit_byte (w, LINE_RANGE); /* line_range */
 764         emit_byte (w, OPCODE_BASE); /* opcode_base */
 765         emit_byte (w, 0); /* standard_opcode_lengths */
 766         emit_byte (w, 1);
 767         emit_byte (w, 1);
 768         emit_byte (w, 1);
 769         emit_byte (w, 1);
 770         emit_byte (w, 0);
 771         emit_byte (w, 0);
 772         emit_byte (w, 0);
 773         emit_byte (w, 1);
 774         emit_byte (w, 0);
 775         emit_byte (w, 0);
 776         emit_byte (w, 1);
 777
 778         /* Includes */
 779         emit_section_change (w, ".debug_line", 0);
 780         for (i = 0; i < w->line_number_dir_index; ++i) {
 781                 char *dir = (char *)g_hash_table_lookup (index_to_dir, GUINT_TO_POINTER (i + 1));
 782
 783                 emit_string (w, mono_dwarf_escape_path (dir));
 784         }
 785         /* End of Includes */
 786         emit_byte (w, 0);
 787
 788         /* Files */
 789         for (i = 0; i < w->line_number_file_index; ++i) {
 790                 char *name = (char *)g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 791                 char *basename = NULL, *dir;
 792                 int dir_index = 0;
 793
 794                 if (g_path_is_absolute (name)) {
 795                         dir = g_path_get_dirname (name);
 796
 797                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 798                         basename = g_path_get_basename (name);
 799                 }
 800
 801                 if (basename)
 802                         emit_string (w, basename);
 803                 else
 804                         emit_string (w, mono_dwarf_escape_path (name));
 805                 emit_uleb128 (w, dir_index);
 806                 emit_byte (w, 0);
 807                 emit_byte (w, 0);
 808         }
 809
 810         /* End of Files */
 811         emit_byte (w, 0);
 812
 813         emit_label (w, ".Ldebug_line_header_end");
 814
 815         /* Emit line number table */
 816         for (l = info_list; l; l = l->next) {
 817                 MethodLineNumberInfo *info = (MethodLineNumberInfo *)l->data;
 818                 MonoDebugMethodJitInfo *dmji;
 819
 820                 dmji = mono_debug_find_method (info->method, mono_domain_get ());
 821                 if (!dmji)
 822                         continue;
 823                 emit_line_number_info (w, info->method, info->start_symbol, info->end_symbol, info->code, info->code_size, dmji);
 824                 mono_debug_free_method_jit_info (dmji);
 825         }
 826         g_slist_free (info_list);
 827
 828         emit_byte (w, 0);
 829         emit_byte (w, 1);
 830         emit_byte (w, DW_LNE_end_sequence);
 831
 832         emit_label (w, ".Ldebug_line_end");
 833 }
 834
 835 /*
 836  * Some assemblers like apple's do not support subsections, so we can't place
 837  * .Ldebug_info_end at the end of the section using subsections. Instead, we
 838  * define it every time something gets added to the .debug_info section.
 839  * The apple assember seems to use the last definition.
 840  */
 841 static void
 842 emit_debug_info_end (MonoDwarfWriter *w)
 843 {
 844         /* This doesn't seem to work/required with recent iphone sdk versions */
 845 #if 0
 846         if (!mono_img_writer_subsections_supported (w->w))
 847                 fprintf (w->fp, "\n.set %sdebug_info_end,.\n", w->temp_prefix);
 848 #endif
 849 }
 850
 851 void
 852 mono_dwarf_writer_emit_base_info (MonoDwarfWriter *w, const char *cu_name, GSList *base_unwind_program)
 853 {
 854         char *s, *build_info;
 855         int i;
 856
 857         w->cie_program = base_unwind_program;
 858
 859         emit_section_change (w, ".debug_abbrev", 0);
 860         emit_dwarf_abbrev (w, ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, TRUE,
 861                                            compile_unit_attr, G_N_ELEMENTS (compile_unit_attr));
 862         emit_dwarf_abbrev (w, ABBREV_SUBPROGRAM, DW_TAG_subprogram, TRUE,
 863                                            subprogram_attr, G_N_ELEMENTS (subprogram_attr));
 864         emit_dwarf_abbrev (w, ABBREV_PARAM, DW_TAG_formal_parameter, FALSE,
 865                                            param_attr, G_N_ELEMENTS (param_attr));
 866         emit_dwarf_abbrev (w, ABBREV_PARAM_LOCLIST, DW_TAG_formal_parameter, FALSE,
 867                                            param_loclist_attr, G_N_ELEMENTS (param_loclist_attr));
 868         emit_dwarf_abbrev (w, ABBREV_BASE_TYPE, DW_TAG_base_type, FALSE,
 869                                            base_type_attr, G_N_ELEMENTS (base_type_attr));
 870         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE, DW_TAG_class_type, TRUE,
 871                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 872         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE_NOCHILDREN, DW_TAG_class_type, FALSE,
 873                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 874         emit_dwarf_abbrev (w, ABBREV_DATA_MEMBER, DW_TAG_member, FALSE,
 875                                            data_member_attr, G_N_ELEMENTS (data_member_attr));
 876         emit_dwarf_abbrev (w, ABBREV_TYPEDEF, DW_TAG_typedef, FALSE,
 877                                            typedef_attr, G_N_ELEMENTS (typedef_attr));
 878         emit_dwarf_abbrev (w, ABBREV_ENUM_TYPE, DW_TAG_enumeration_type, TRUE,
 879                                            enum_type_attr, G_N_ELEMENTS (enum_type_attr));
 880         emit_dwarf_abbrev (w, ABBREV_ENUMERATOR, DW_TAG_enumerator, FALSE,
 881                                            enumerator_attr, G_N_ELEMENTS (enumerator_attr));
 882         emit_dwarf_abbrev (w, ABBREV_NAMESPACE, DW_TAG_namespace, TRUE,
 883                                            namespace_attr, G_N_ELEMENTS (namespace_attr));
 884         emit_dwarf_abbrev (w, ABBREV_VARIABLE, DW_TAG_variable, FALSE,
 885                                            variable_attr, G_N_ELEMENTS (variable_attr));
 886         emit_dwarf_abbrev (w, ABBREV_VARIABLE_LOCLIST, DW_TAG_variable, FALSE,
 887                                            variable_loclist_attr, G_N_ELEMENTS (variable_loclist_attr));
 888         emit_dwarf_abbrev (w, ABBREV_POINTER_TYPE, DW_TAG_pointer_type, FALSE,
 889                                            pointer_type_attr, G_N_ELEMENTS (pointer_type_attr));
 890         emit_dwarf_abbrev (w, ABBREV_REFERENCE_TYPE, DW_TAG_reference_type, FALSE,
 891                                            reference_type_attr, G_N_ELEMENTS (reference_type_attr));
 892         emit_dwarf_abbrev (w, ABBREV_INHERITANCE, DW_TAG_inheritance, FALSE,
 893                                            inheritance_attr, G_N_ELEMENTS (inheritance_attr));
 894         emit_dwarf_abbrev (w, ABBREV_TRAMP_SUBPROGRAM, DW_TAG_subprogram, FALSE,
 895                                            tramp_subprogram_attr, G_N_ELEMENTS (tramp_subprogram_attr));
 896         emit_byte (w, 0);
 897
 898         emit_section_change (w, ".debug_info", 0);
 899         emit_label (w, ".Ldebug_info_start");
 900         emit_symbol_diff (w, ".Ldebug_info_end", ".Ldebug_info_begin", 0); /* length */
 901         emit_label (w, ".Ldebug_info_begin");
 902         emit_int16 (w, 0x2); /* DWARF version 2 */
 903         emit_int32 (w, 0); /* .debug_abbrev offset */
 904         emit_byte (w, sizeof (gpointer)); /* address size */
 905
 906         /* Compilation unit */
 907         emit_uleb128 (w, ABBREV_COMPILE_UNIT);
 908         build_info = mono_get_runtime_build_info ();
 909         s = g_strdup_printf ("Mono AOT Compiler %s", build_info);
 910         emit_string (w, s);
 911         g_free (build_info);
 912         g_free (s);
 913         emit_string (w, cu_name);
 914         emit_string (w, "");
 915         emit_byte (w, DW_LANG_C);
 916         emit_pointer_value (w, 0);
 917         emit_pointer_value (w, 0);
 918         /* offset into .debug_line section */
 919         if (w->emit_line)
 920                 emit_symbol_diff (w, ".Ldebug_line_start", ".Ldebug_line_section_start", 0);
 921         else
 922                 emit_pointer_value (w, 0);
 923
 924         /* Base types */
 925         for (i = 0; i < G_N_ELEMENTS (basic_types); ++i) {
 926                 emit_label (w, basic_types [i].die_name);
 927                 emit_uleb128 (w, ABBREV_BASE_TYPE);
 928                 emit_byte (w, basic_types [i].size);
 929                 emit_byte (w, basic_types [i].encoding);
 930                 emit_string (w, basic_types [i].name);
 931         }
 932
 933         emit_debug_info_end (w);
 934
 935         /* debug_loc section */
 936         emit_section_change (w, ".debug_loc", 0);
 937         emit_label (w, ".Ldebug_loc_start");
 938
 939         emit_cie (w);
 940 }
 941
 942 /*
 943  * mono_dwarf_writer_close:
 944  *
 945  *   Finalize the emitted debugging info.
 946  */
 947 void
 948 mono_dwarf_writer_close (MonoDwarfWriter *w)
 949 {
 950         emit_section_change (w, ".debug_info", 0);
 951         emit_byte (w, 0); /* close COMPILE_UNIT */
 952         emit_label (w, ".Ldebug_info_end");
 953
 954         if (w->emit_line)
 955                 emit_all_line_number_info (w);
 956 }
 957
 958 static void emit_type (MonoDwarfWriter *w, MonoType *t);
 959 static const char* get_type_die (MonoDwarfWriter *w, MonoType *t);
 960
 961 static const char*
 962 get_class_die (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
 963 {
 964         GHashTable *cache;
 965
 966         if (vtype)
 967                 cache = w->class_to_vtype_die;
 968         else
 969                 cache = w->class_to_die;
 970
 971         return (const char *)g_hash_table_lookup (cache, klass);
 972 }
 973
 974 /* Returns the local symbol pointing to the emitted debug info */
 975 static char*
 976 emit_class_dwarf_info (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
 977 {
 978         char *die, *pointer_die, *reference_die;
 979         char *full_name, *p;
 980         gpointer iter;
 981         MonoClassField *field;
 982         const char *fdie;
 983         int k;
 984         gboolean emit_namespace = FALSE, has_children;
 985         GHashTable *cache;
 986
 987         if (vtype)
 988                 cache = w->class_to_vtype_die;
 989         else
 990                 cache = w->class_to_die;
 991
 992         die = (char *)g_hash_table_lookup (cache, klass);
 993         if (die)
 994                 return die;
 995
 996         if (!((klass->byval_arg.type == MONO_TYPE_CLASS) || (klass->byval_arg.type == MONO_TYPE_OBJECT) || klass->byval_arg.type == MONO_TYPE_GENERICINST || klass->enumtype || (klass->byval_arg.type == MONO_TYPE_VALUETYPE && vtype) ||
 997                   (klass->byval_arg.type >= MONO_TYPE_BOOLEAN && klass->byval_arg.type <= MONO_TYPE_R8 && !vtype)))
 998                 return NULL;
 999
1000         /*
1001          * FIXME: gdb can't handle namespaces in languages it doesn't know about.
1002          */
1003         /*
1004         if (klass->name_space && klass->name_space [0] != '\0')
1005                 emit_namespace = TRUE;
1006         */
1007         if (emit_namespace) {
1008                 emit_uleb128 (w, ABBREV_NAMESPACE);
1009                 emit_string (w, klass->name_space);
1010         }
1011
1012         full_name = g_strdup_printf ("%s%s%s", klass->name_space, klass->name_space ? "." : "", klass->name);
1013         /*
1014          * gdb doesn't support namespaces for non-C++ dwarf objects, so use _
1015          * to separate components.
1016          */
1017         for (p = full_name; *p; p ++)
1018                 if (*p == '.')
1019                         *p = '_';
1020
1021         die = g_strdup_printf (".LTDIE_%d", w->tdie_index);
1022         pointer_die = g_strdup_printf (".LTDIE_%d_POINTER", w->tdie_index);
1023         reference_die = g_strdup_printf (".LTDIE_%d_REFERENCE", w->tdie_index);
1024         w->tdie_index ++;
1025
1026         g_hash_table_insert (w->class_to_pointer_die, klass, pointer_die);
1027         g_hash_table_insert (w->class_to_reference_die, klass, reference_die);
1028         g_hash_table_insert (cache, klass, die);
1029
1030         if (klass->enumtype) {
1031                 int size = mono_class_value_size (mono_class_from_mono_type (mono_class_enum_basetype (klass)), NULL);
1032
1033                 emit_label (w, die);
1034
1035                 emit_uleb128 (w, ABBREV_ENUM_TYPE);
1036                 emit_string (w, full_name);
1037                 emit_uleb128 (w, size);
1038                 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
1039                         if (basic_types [k].type == mono_class_enum_basetype (klass)->type)
1040                                 break;
1041                 g_assert (k < G_N_ELEMENTS (basic_types));
1042                 emit_symbol_diff (w, basic_types [k].die_name, ".Ldebug_info_start", 0);
1043
1044                 /* Emit enum values */
1045                 iter = NULL;
1046                 while ((field = mono_class_get_fields (klass, &iter))) {
1047                         const char *p;
1048                         MonoTypeEnum def_type;
1049
1050                         if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC))
1051                                 continue;
1052                         if (mono_field_is_deleted (field))
1053                                 continue;
1054
1055                         emit_uleb128 (w, ABBREV_ENUMERATOR);
1056                         emit_string (w, mono_field_get_name (field));
1057
1058                         p = mono_class_get_field_default_value (field, &def_type);
1059                         /* len = */ mono_metadata_decode_blob_size (p, &p);
1060                         switch (mono_class_enum_basetype (klass)->type) {
1061                         case MONO_TYPE_U1:
1062                         case MONO_TYPE_I1:
1063                         case MONO_TYPE_BOOLEAN:
1064                                 emit_sleb128 (w, *p);
1065                                 break;
1066                         case MONO_TYPE_U2:
1067                         case MONO_TYPE_I2:
1068                         case MONO_TYPE_CHAR:
1069                                 emit_sleb128 (w, read16 (p));
1070                                 break;
1071                         case MONO_TYPE_U4:
1072                         case MONO_TYPE_I4:
1073                                 emit_sleb128 (w, read32 (p));
1074                                 break;
1075                         case MONO_TYPE_U8:
1076                         case MONO_TYPE_I8:
1077                                 emit_sleb128 (w, read64 (p));
1078                                 break;
1079                         case MONO_TYPE_I:
1080                         case MONO_TYPE_U:
1081 #if SIZEOF_VOID_P == 8
1082                                 emit_sleb128 (w, read64 (p));
1083 #else
1084                                 emit_sleb128 (w, read32 (p));
1085 #endif
1086                                 break;
1087                         default:
1088                                 g_assert_not_reached ();
1089                         }
1090                 }
1091
1092                 has_children = TRUE;
1093         } else {
1094                 guint8 buf [128];
1095                 guint8 *p;
1096                 char *parent_die;
1097
1098                 if (klass->parent)
1099                         parent_die = emit_class_dwarf_info (w, klass->parent, FALSE);
1100                 else
1101                         parent_die = NULL;
1102
1103                 /* Emit field types */
1104                 iter = NULL;
1105                 while ((field = mono_class_get_fields (klass, &iter))) {
1106                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1107                                 continue;
1108
1109                         emit_type (w, field->type);
1110                 }
1111
1112                 iter = NULL;
1113                 has_children = parent_die || mono_class_get_fields (klass, &iter);
1114
1115                 emit_label (w, die);
1116
1117                 emit_uleb128 (w, has_children ? ABBREV_STRUCT_TYPE : ABBREV_STRUCT_TYPE_NOCHILDREN);
1118                 emit_string (w, full_name);
1119                 emit_uleb128 (w, klass->instance_size);
1120
1121                 if (parent_die) {
1122                         emit_uleb128 (w, ABBREV_INHERITANCE);
1123                         emit_symbol_diff (w, parent_die, ".Ldebug_info_start", 0);
1124
1125                         p = buf;
1126                         *p ++= DW_OP_plus_uconst;
1127                         encode_uleb128 (0, p, &p);
1128                         emit_byte (w, p - buf);
1129                         emit_bytes (w, buf, p - buf);
1130                 }
1131
1132                 /* Emit fields */
1133                 iter = NULL;
1134                 while ((field = mono_class_get_fields (klass, &iter))) {
1135                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1136                                 continue;
1137
1138                         fdie = get_type_die (w, field->type);
1139                         if (fdie) {
1140                                 emit_uleb128 (w, ABBREV_DATA_MEMBER);
1141                                 emit_string (w, field->name);
1142                                 emit_symbol_diff (w, fdie, ".Ldebug_info_start", 0);
1143                                 /* location */
1144                                 p = buf;
1145                                 *p ++= DW_OP_plus_uconst;
1146                                 if (klass->valuetype && vtype)
1147                                         encode_uleb128 (field->offset - sizeof (MonoObject), p, &p);
1148                                 else
1149                                         encode_uleb128 (field->offset, p, &p);
1150
1151                                 emit_byte (w, p - buf);
1152                                 emit_bytes (w, buf, p - buf);
1153                         }
1154                 }
1155         }
1156
1157         /* Type end */
1158         if (has_children)
1159                 emit_uleb128 (w, 0x0);
1160
1161         /* Add a typedef, so we can reference the type without a 'struct' in gdb */
1162         emit_uleb128 (w, ABBREV_TYPEDEF);
1163         emit_string (w, full_name);
1164         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1165
1166         /* Add a pointer type */
1167         emit_label (w, pointer_die);
1168
1169         emit_uleb128 (w, ABBREV_POINTER_TYPE);
1170         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1171
1172         /* Add a reference type */
1173         emit_label (w, reference_die);
1174
1175         emit_uleb128 (w, ABBREV_REFERENCE_TYPE);
1176         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1177
1178         g_free (full_name);
1179
1180         if (emit_namespace) {
1181                 /* Namespace end */
1182                 emit_uleb128 (w, 0x0);
1183         }
1184
1185         return die;
1186 }
1187
1188 static gboolean base_types_emitted [64];
1189
1190 static const char*
1191 get_type_die (MonoDwarfWriter *w, MonoType *t)
1192 {
1193         MonoClass *klass = mono_class_from_mono_type (t);
1194         int j;
1195         const char *tdie;
1196
1197         if (t->byref) {
1198                 if (t->type == MONO_TYPE_VALUETYPE) {
1199                         tdie = (const char *)g_hash_table_lookup (w->class_to_pointer_die, klass);
1200                 }
1201                 else {
1202                         tdie = get_class_die (w, klass, FALSE);
1203                         /* Should return a pointer type to a reference */
1204                 }
1205                 // FIXME:
1206                 t = &mono_defaults.int_class->byval_arg;
1207         }
1208         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1209                 if (basic_types [j].type == t->type)
1210                         break;
1211         if (j < G_N_ELEMENTS (basic_types)) {
1212                 tdie = basic_types [j].die_name;
1213         } else {
1214                 switch (t->type) {
1215                 case MONO_TYPE_CLASS:
1216                         tdie = (const char *)g_hash_table_lookup (w->class_to_reference_die, klass);
1217                         //tdie = ".LDIE_OBJECT";
1218                         break;
1219                 case MONO_TYPE_ARRAY:
1220                         tdie = ".LDIE_OBJECT";
1221                         break;
1222                 case MONO_TYPE_VALUETYPE:
1223                         if (klass->enumtype)
1224                                 tdie = get_class_die (w, klass, FALSE);
1225                         else
1226                                 tdie = ".LDIE_I4";
1227                         break;
1228                 case MONO_TYPE_GENERICINST:
1229                         if (!MONO_TYPE_ISSTRUCT (t)) {
1230                                 tdie = (const char *)g_hash_table_lookup (w->class_to_reference_die, klass);
1231                         } else {
1232                                 tdie = ".LDIE_I4";
1233                         }
1234                         break;
1235                 case MONO_TYPE_PTR:
1236                         tdie = ".LDIE_I";
1237                         break;
1238                 default:
1239                         tdie = ".LDIE_I4";
1240                         break;
1241                 }
1242         }
1243
1244         g_assert (tdie);
1245
1246         return tdie;
1247 }
1248
1249 static void
1250 emit_type (MonoDwarfWriter *w, MonoType *t)
1251 {
1252         MonoClass *klass = mono_class_from_mono_type (t);
1253         int j;
1254         const char *tdie;
1255
1256         if (t->byref) {
1257                 if (t->type == MONO_TYPE_VALUETYPE) {
1258                         tdie = emit_class_dwarf_info (w, klass, TRUE);
1259                         if (tdie)
1260                                 return;
1261                 }
1262                 else {
1263                         emit_class_dwarf_info (w, klass, FALSE);
1264                 }
1265                 // FIXME:
1266                 t = &mono_defaults.int_class->byval_arg;
1267         }
1268         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1269                 if (basic_types [j].type == t->type)
1270                         break;
1271         if (j < G_N_ELEMENTS (basic_types)) {
1272                 /* Emit a boxed version of base types */
1273                 if (j < 64 && !base_types_emitted [j]) {
1274                         emit_class_dwarf_info (w, klass, FALSE);
1275                         base_types_emitted [j] = TRUE;
1276                 }
1277         } else {
1278                 switch (t->type) {
1279                 case MONO_TYPE_CLASS:
1280                         emit_class_dwarf_info (w, klass, FALSE);
1281                         break;
1282                 case MONO_TYPE_ARRAY:
1283                         break;
1284                 case MONO_TYPE_VALUETYPE:
1285                         if (klass->enumtype)
1286                                 emit_class_dwarf_info (w, klass, FALSE);
1287                         break;
1288                 case MONO_TYPE_GENERICINST:
1289                         if (!MONO_TYPE_ISSTRUCT (t))
1290                                 emit_class_dwarf_info (w, klass, FALSE);
1291                         break;
1292                 case MONO_TYPE_PTR:
1293                         break;
1294                 default:
1295                         break;
1296                 }
1297         }
1298 }
1299
1300 static void
1301 emit_var_type (MonoDwarfWriter *w, MonoType *t)
1302 {
1303         const char *tdie;
1304
1305         tdie = get_type_die (w, t);
1306
1307         emit_symbol_diff (w, tdie, ".Ldebug_info_start", 0);
1308 }
1309
1310 static void
1311 encode_var_location (MonoDwarfWriter *w, MonoInst *ins, guint8 *p, guint8 **endp)
1312 {
1313         /* location */
1314         /* FIXME: This needs a location list, since the args can go from reg->stack */
1315         if (!ins || ins->flags & MONO_INST_IS_DEAD) {
1316                 /* gdb treats this as optimized out */
1317         } else if (ins->opcode == OP_REGVAR) {
1318                 *p = DW_OP_reg0 + mono_hw_reg_to_dwarf_reg (ins->dreg);
1319                 p ++;
1320         } else if (ins->opcode == OP_REGOFFSET) {
1321                 *p ++= DW_OP_breg0 + mono_hw_reg_to_dwarf_reg (ins->inst_basereg);
1322                 encode_sleb128 (ins->inst_offset, p, &p);
1323         } else {
1324                 // FIXME:
1325                 *p ++ = DW_OP_reg0;
1326         }
1327
1328         *endp = p;
1329 }
1330
1331 static void
1332 emit_loclist (MonoDwarfWriter *w, MonoInst *ins,
1333                           guint8 *loclist_begin_addr, guint8 *loclist_end_addr,
1334                           guint8 *expr, guint32 expr_len)
1335 {
1336         char label [128];
1337
1338         emit_push_section (w, ".debug_loc", 0);
1339         sprintf (label, ".Lloclist_%d", w->loclist_index ++ );
1340         emit_label (w, label);
1341
1342         emit_pointer_value (w, loclist_begin_addr);
1343         emit_pointer_value (w, loclist_end_addr);
1344         emit_byte (w, expr_len % 256);
1345         emit_byte (w, expr_len / 256);
1346         emit_bytes (w, expr, expr_len);
1347
1348         emit_pointer_value (w, NULL);
1349         emit_pointer_value (w, NULL);
1350
1351         emit_pop_section (w);
1352         emit_symbol_diff (w, label, ".Ldebug_loc_start", 0);
1353 }
1354
1355 /*
1356  * MonoDisHelper->tokener doesn't take an IP argument, and we can't add one since
1357  * it is a public header.
1358  */
1359 static const guint8 *token_handler_ip;
1360
1361 static char*
1362 token_handler (MonoDisHelper *dh, MonoMethod *method, guint32 token)
1363 {
1364         MonoError error;
1365         char *res, *desc;
1366         MonoMethod *cmethod;
1367         MonoClass *klass;
1368         MonoClassField *field;
1369         gpointer data = NULL;
1370
1371         if (method->wrapper_type)
1372                 data = mono_method_get_wrapper_data (method, token);
1373
1374         switch (*token_handler_ip) {
1375         case CEE_ISINST:
1376         case CEE_CASTCLASS:
1377         case CEE_LDELEMA:
1378                 if (method->wrapper_type) {
1379                         klass = (MonoClass *)data;
1380                 } else {
1381                         klass = mono_class_get_checked (method->klass->image, token, &error);
1382                         g_assert (mono_error_ok (&error)); /* FIXME error handling */
1383                 }
1384                 res = g_strdup_printf ("<%s>", klass->name);
1385                 break;
1386         case CEE_NEWOBJ:
1387         case CEE_CALL:
1388         case CEE_CALLVIRT:
1389                 if (method->wrapper_type) {
1390                         cmethod = (MonoMethod *)data;
1391                 } else {
1392                         MonoError error;
1393                         cmethod = mono_get_method_checked (method->klass->image, token, NULL, NULL, &error);
1394                         if (!cmethod)
1395                                 g_error ("Could not load method due to %s", mono_error_get_message (&error)); /* FIXME don't swallow the error */
1396                 }
1397                 desc = mono_method_full_name (cmethod, TRUE);
1398                 res = g_strdup_printf ("<%s>", desc);
1399                 g_free (desc);
1400                 break;
1401         case CEE_CALLI:
1402                 if (method->wrapper_type) {
1403                         desc = mono_signature_get_desc ((MonoMethodSignature *)data, FALSE);
1404                         res = g_strdup_printf ("<%s>", desc);
1405                         g_free (desc);
1406                 } else {
1407                         res = g_strdup_printf ("<0x%08x>", token);
1408                 }
1409                 break;
1410         case CEE_LDFLD:
1411         case CEE_LDSFLD:
1412         case CEE_STFLD:
1413         case CEE_STSFLD:
1414                 if (method->wrapper_type) {
1415                         field = (MonoClassField *)data;
1416                 } else {
1417                         field = mono_field_from_token_checked (method->klass->image, token, &klass, NULL,  &error);
1418                         g_assert (mono_error_ok (&error)); /* FIXME error handling */
1419                 }
1420                 desc = mono_field_full_name (field);
1421                 res = g_strdup_printf ("<%s>", desc);
1422                 g_free (desc);
1423                 break;
1424         default:
1425                 res = g_strdup_printf ("<0x%08x>", token);
1426                 break;
1427         }
1428
1429         return res;
1430 }
1431
1432 /*
1433  * disasm_ins:
1434  *
1435  *   Produce a disassembled form of the IL instruction at IP. This is an extension
1436  * of mono_disasm_code_one () which can disasm tokens, handle wrapper methods, and
1437  * CEE_MONO_ opcodes.
1438  */
1439 static char*
1440 disasm_ins (MonoMethod *method, const guchar *ip, const guint8 **endip)
1441 {
1442         MonoError error;
1443         char *dis;
1444         MonoDisHelper dh;
1445         MonoMethodHeader *header = mono_method_get_header_checked (method, &error);
1446         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1447
1448         memset (&dh, 0, sizeof (dh));
1449         dh.newline = "";
1450         dh.label_format = "IL_%04x: ";
1451         dh.label_target = "IL_%04x";
1452         dh.tokener = token_handler;
1453
1454         token_handler_ip = ip;
1455         if (*ip == MONO_CUSTOM_PREFIX) {
1456                 guint32 token;
1457                 gpointer data;
1458
1459                 switch (ip [1]) {
1460                 case CEE_MONO_ICALL: {
1461                         MonoJitICallInfo *info;
1462
1463                         token = read32 (ip + 2);
1464                         data = mono_method_get_wrapper_data (method, token);
1465                         info = mono_find_jit_icall_by_addr (data);
1466                         g_assert (info);
1467
1468                         dis = g_strdup_printf ("IL_%04x: mono_icall <%s>", (int)(ip - header->code), info->name);
1469                         ip += 6;
1470                         break;
1471                 }
1472                 case CEE_MONO_CLASSCONST: {
1473                         token = read32 (ip + 2);
1474                         data = mono_method_get_wrapper_data (method, token);
1475
1476                         dis = g_strdup_printf ("IL_%04x: mono_classconst <%s>", (int)(ip - header->code), ((MonoClass*)data)->name);
1477                         ip += 6;
1478                         break;
1479                 }
1480                 default:
1481                         dis = mono_disasm_code_one (&dh, method, ip, &ip);
1482                 }
1483         } else {
1484                 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1485         }
1486         token_handler_ip = NULL;
1487
1488         *endip = ip;
1489         mono_metadata_free_mh (header);
1490         return dis;
1491 }
1492
1493 static gint32
1494 il_offset_from_address (MonoMethod *method, MonoDebugMethodJitInfo *jit,
1495                                                 guint32 native_offset)
1496 {
1497         int i;
1498
1499         if (!jit->line_numbers)
1500                 return -1;
1501
1502         for (i = jit->num_line_numbers - 1; i >= 0; i--) {
1503                 MonoDebugLineNumberEntry lne = jit->line_numbers [i];
1504
1505                 if (lne.native_offset <= native_offset)
1506                         return lne.il_offset;
1507         }
1508
1509         return -1;
1510 }
1511
1512 static int max_special_addr_diff = 0;
1513
1514 static inline void
1515 emit_advance_op (MonoDwarfWriter *w, int line_diff, int addr_diff)
1516 {
1517         gint64 opcode = 0;
1518
1519         /* Use a special opcode if possible */
1520         if (line_diff - LINE_BASE >= 0 && line_diff - LINE_BASE < LINE_RANGE) {
1521                 if (max_special_addr_diff == 0)
1522                         max_special_addr_diff = (255 - OPCODE_BASE) / LINE_RANGE;
1523
1524                 if (addr_diff > max_special_addr_diff && (addr_diff < 2 * max_special_addr_diff)) {
1525                         emit_byte (w, DW_LNS_const_add_pc);
1526                         addr_diff -= max_special_addr_diff;
1527                 }
1528
1529                 opcode = (line_diff - LINE_BASE) + (LINE_RANGE * addr_diff) + OPCODE_BASE;
1530                 if (opcode > 255)
1531                         opcode = 0;
1532         }
1533
1534         if (opcode != 0) {
1535                 emit_byte (w, opcode);
1536         } else {
1537                 //printf ("large: %d %d %d\n", line_diff, addr_diff, max_special_addr_diff);
1538                 emit_byte (w, DW_LNS_advance_line);
1539                 emit_sleb128 (w, line_diff);
1540                 emit_byte (w, DW_LNS_advance_pc);
1541                 emit_sleb128 (w, addr_diff);
1542                 emit_byte (w, DW_LNS_copy);
1543         }
1544 }
1545
1546 static gint
1547 compare_lne (MonoDebugLineNumberEntry *a, MonoDebugLineNumberEntry *b)
1548 {
1549         if (a->native_offset == b->native_offset)
1550                 return a->il_offset - b->il_offset;
1551         else
1552                 return a->native_offset - b->native_offset;
1553 }
1554
1555 static void
1556 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
1557                                            char *start_symbol, char *end_symbol,
1558                                            guint8 *code, guint32 code_size,
1559                                            MonoDebugMethodJitInfo *debug_info)
1560 {
1561         MonoError error;
1562         guint32 prev_line = 0;
1563         guint32 prev_native_offset = 0;
1564         int i, file_index, il_offset, prev_il_offset;
1565         gboolean first = TRUE;
1566         MonoDebugSourceLocation *loc;
1567         char *prev_file_name = NULL;
1568         MonoMethodHeader *header = mono_method_get_header_checked (method, &error);
1569         MonoDebugMethodInfo *minfo;
1570         MonoDebugLineNumberEntry *ln_array;
1571         int *native_to_il_offset = NULL;
1572
1573         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1574
1575         if (!w->emit_line) {
1576                 mono_metadata_free_mh (header);
1577                 return;
1578         }
1579
1580         minfo = mono_debug_lookup_method (method);
1581
1582         /* Compute the native->IL offset mapping */
1583
1584         g_assert (code_size);
1585
1586         ln_array = g_new0 (MonoDebugLineNumberEntry, debug_info->num_line_numbers);
1587         memcpy (ln_array, debug_info->line_numbers, debug_info->num_line_numbers * sizeof (MonoDebugLineNumberEntry));
1588
1589         qsort (ln_array, debug_info->num_line_numbers, sizeof (MonoDebugLineNumberEntry), (int (*)(const void *, const void *))compare_lne);
1590
1591         native_to_il_offset = g_new0 (int, code_size + 1);
1592
1593         for (i = 0; i < debug_info->num_line_numbers; ++i) {
1594                 int j;
1595                 MonoDebugLineNumberEntry *lne = &ln_array [i];
1596
1597                 if (i == 0) {
1598                         for (j = 0; j < lne->native_offset; ++j)
1599                                 native_to_il_offset [j] = -1;
1600                 }
1601
1602                 if (i < debug_info->num_line_numbers - 1) {
1603                         MonoDebugLineNumberEntry *lne_next = &ln_array [i + 1];
1604
1605                         for (j = lne->native_offset; j < lne_next->native_offset; ++j)
1606                                 native_to_il_offset [j] = lne->il_offset;
1607                 } else {
1608                         for (j = lne->native_offset; j < code_size; ++j)
1609                                 native_to_il_offset [j] = lne->il_offset;
1610                 }
1611         }
1612         g_free (ln_array);
1613
1614         prev_line = 1;
1615         prev_il_offset = -1;
1616
1617         w->cur_file_index = -1;
1618         for (i = 0; i < code_size; ++i) {
1619                 int line_diff, addr_diff;
1620
1621                 if (!minfo)
1622                         continue;
1623
1624                 if (!debug_info->line_numbers)
1625                         continue;
1626
1627                 if (native_to_il_offset)
1628                         il_offset = native_to_il_offset [i];
1629                 else
1630                         il_offset = il_offset_from_address (method, debug_info, i);
1631                 /*
1632                 il_offset = il_offset_from_address (method, debug_info, i);
1633
1634                 g_assert (il_offset == native_to_il_offset [i]);
1635                 */
1636
1637                 il_offset = native_to_il_offset [i];
1638                 if (il_offset < 0)
1639                         continue;
1640
1641                 if (il_offset == prev_il_offset)
1642                         continue;
1643
1644                 prev_il_offset = il_offset;
1645
1646                 loc = mono_debug_symfile_lookup_location (minfo, il_offset);
1647                 if (!loc)
1648                         continue;
1649                 if (!loc->source_file) {
1650                         mono_debug_symfile_free_location (loc);
1651                         continue;
1652                 }
1653
1654                 line_diff = (gint32)loc->row - (gint32)prev_line;
1655                 addr_diff = i - prev_native_offset;
1656
1657                 if (first) {
1658                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1659
1660                         emit_byte (w, 0);
1661                         emit_byte (w, sizeof (gpointer) + 1);
1662                         emit_byte (w, DW_LNE_set_address);
1663                         if (start_symbol)
1664                                 emit_pointer_unaligned (w, start_symbol);
1665                         else
1666                                 emit_pointer_value (w, code);
1667                         first = FALSE;
1668                 }
1669
1670                 if (loc->row != prev_line) {
1671                         if (!prev_file_name || strcmp (loc->source_file, prev_file_name) != 0) {
1672                                 /* Add an entry to the file table */
1673                                 /* FIXME: Avoid duplicates */
1674                                 file_index = get_line_number_file_name (w, loc->source_file) + 1;
1675                                 g_free (prev_file_name);
1676                                 prev_file_name = g_strdup (loc->source_file);
1677
1678                                 if (w->cur_file_index != file_index) {
1679                                         emit_byte (w, DW_LNS_set_file);
1680                                         emit_uleb128 (w, file_index);
1681                                         emit_byte (w, DW_LNS_copy);
1682                                         w->cur_file_index = file_index;
1683                                 }
1684                         }
1685                 }
1686
1687                 if (loc->row != prev_line) {
1688                         if (prev_native_offset == 0)
1689                                 emit_byte (w, DW_LNE_set_prologue_end);
1690
1691                         //printf ("X: %p(+0x%x) %d %s:%d(+%d)\n", code + i, addr_diff, loc->il_offset, loc->source_file, loc->row, line_diff);
1692                         emit_advance_op (w, line_diff, addr_diff);
1693
1694                         prev_line = loc->row;
1695                         prev_native_offset = i;
1696                 }
1697
1698                 mono_debug_symfile_free_location (loc);
1699                 first = FALSE;
1700         }
1701
1702         g_free (native_to_il_offset);
1703         g_free (prev_file_name);
1704
1705         if (!first) {
1706                 emit_byte (w, DW_LNS_advance_pc);
1707                 emit_sleb128 (w, code_size - prev_native_offset);
1708                 emit_byte (w, DW_LNS_copy);
1709
1710                 emit_byte (w, 0);
1711                 emit_byte (w, 1);
1712                 emit_byte (w, DW_LNE_end_sequence);
1713         } else if (!start_symbol) {
1714                 /* No debug info, XDEBUG mode */
1715                 char *name, *dis;
1716                 const guint8 *ip = header->code;
1717                 int prev_line, prev_native_offset;
1718                 int *il_to_line;
1719
1720                 /*
1721                  * Emit the IL code into a temporary file and emit line number info
1722                  * referencing that file.
1723                  */
1724
1725                 name = mono_method_full_name (method, TRUE);
1726                 fprintf (w->il_file, "// %s\n", name);
1727                 w->il_file_line_index ++;
1728                 g_free (name);
1729
1730                 il_to_line = g_new0 (int, header->code_size);
1731
1732                 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1733                 emit_byte (w, 0);
1734                 emit_byte (w, sizeof (gpointer) + 1);
1735                 emit_byte (w, DW_LNE_set_address);
1736                 emit_pointer_value (w, code);
1737
1738                 // FIXME: Optimize this
1739                 while (ip < header->code + header->code_size) {
1740                         int il_offset = ip - header->code;
1741
1742                         /* Emit IL */
1743                         w->il_file_line_index ++;
1744
1745                         dis = disasm_ins (method, ip, &ip);
1746                         fprintf (w->il_file, "%s\n", dis);
1747                         g_free (dis);
1748
1749                         il_to_line [il_offset] = w->il_file_line_index;
1750                 }
1751
1752                 /* Emit line number info */
1753                 prev_line = 1;
1754                 prev_native_offset = 0;
1755                 for (i = 0; i < debug_info->num_line_numbers; ++i) {
1756                         MonoDebugLineNumberEntry *lne = &debug_info->line_numbers [i];
1757                         int line;
1758
1759                         if (lne->il_offset >= header->code_size)
1760                                 continue;
1761                         line = il_to_line [lne->il_offset];
1762                         if (!line) {
1763                                 /*
1764                                  * This seems to happen randomly, it looks like il_offset points
1765                                  * into the middle of an instruction.
1766                                  */
1767                                 continue;
1768                                 /*
1769                                 printf ("%s\n", mono_method_full_name (method, TRUE));
1770                                 printf ("%d %d\n", lne->il_offset, header->code_size);
1771                                 g_assert (line);
1772                                 */
1773                         }
1774
1775                         if (line - prev_line != 0) {
1776                                 emit_advance_op (w, line - prev_line, (gint32)lne->native_offset - prev_native_offset);
1777
1778                                 prev_line = line;
1779                                 prev_native_offset = lne->native_offset;
1780                         }
1781                 }
1782
1783                 emit_byte (w, DW_LNS_advance_pc);
1784                 emit_sleb128 (w, code_size - prev_native_offset);
1785                 emit_byte (w, DW_LNS_copy);
1786
1787                 emit_byte (w, 0);
1788                 emit_byte (w, 1);
1789                 emit_byte (w, DW_LNE_end_sequence);
1790
1791                 fflush (w->il_file);
1792                 g_free (il_to_line);
1793         }
1794         mono_metadata_free_mh (header);
1795 }
1796
1797 static MonoMethodVar*
1798 find_vmv (MonoCompile *cfg, MonoInst *ins)
1799 {
1800         int j;
1801
1802         if (cfg->varinfo) {
1803                 for (j = 0; j < cfg->num_varinfo; ++j) {
1804                         if (cfg->varinfo [j] == ins)
1805                                 break;
1806                 }
1807
1808                 if (j < cfg->num_varinfo) {
1809                         return MONO_VARINFO (cfg, j);
1810                 }
1811         }
1812
1813         return NULL;
1814 }
1815
1816 void
1817 mono_dwarf_writer_emit_method (MonoDwarfWriter *w, MonoCompile *cfg, MonoMethod *method, char *start_symbol, char *end_symbol, char *linkage_name,
1818                                                            guint8 *code, guint32 code_size, MonoInst **args, MonoInst **locals, GSList *unwind_info, MonoDebugMethodJitInfo *debug_info)
1819 {
1820         MonoError error;
1821         char *name;
1822         MonoMethodSignature *sig;
1823         MonoMethodHeader *header;
1824         char **names;
1825         MonoDebugLocalsInfo *locals_info;
1826         MonoDebugMethodInfo *minfo;
1827         MonoDebugSourceLocation *loc = NULL;
1828         int i;
1829         guint8 buf [128];
1830         guint8 *p;
1831
1832         emit_section_change (w, ".debug_info", 0);
1833
1834         sig = mono_method_signature (method);
1835         header = mono_method_get_header_checked (method, &error);
1836         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1837
1838         /* Parameter types */
1839         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1840                 MonoType *t;
1841
1842                 if (i == 0 && sig->hasthis) {
1843                         if (method->klass->valuetype)
1844                                 t = &method->klass->this_arg;
1845                         else
1846                                 t = &method->klass->byval_arg;
1847                 } else {
1848                         t = sig->params [i - sig->hasthis];
1849                 }
1850
1851                 emit_type (w, t);
1852         }
1853         //emit_type (w, &mono_defaults.int32_class->byval_arg);
1854
1855         /* Local types */
1856         for (i = 0; i < header->num_locals; ++i) {
1857                 emit_type (w, header->locals [i]);
1858         }
1859
1860         minfo = mono_debug_lookup_method (method);
1861         if (minfo)
1862                 loc = mono_debug_symfile_lookup_location (minfo, 0);
1863
1864         /* Subprogram */
1865         names = g_new0 (char *, sig->param_count);
1866         mono_method_get_param_names (method, (const char **) names);
1867
1868         emit_uleb128 (w, ABBREV_SUBPROGRAM);
1869         /* DW_AT_name */
1870         name = mono_method_full_name (method, FALSE);
1871         emit_escaped_string (w, name);
1872         /* DW_AT_MIPS_linkage_name */
1873         if (linkage_name)
1874                 emit_string (w, linkage_name);
1875         else
1876                 emit_string (w, "");
1877         /* DW_AT_decl_file/DW_AT_decl_line */
1878         if (loc) {
1879                 int file_index = add_line_number_file_name (w, loc->source_file, 0, 0);
1880                 emit_uleb128 (w, file_index + 1);
1881                 emit_uleb128 (w, loc->row);
1882
1883                 mono_debug_symfile_free_location (loc);
1884                 loc = NULL;
1885         } else {
1886                 emit_uleb128 (w, 0);
1887                 emit_uleb128 (w, 0);
1888         }
1889 #ifndef TARGET_IOS
1890         emit_string (w, name);
1891 #endif
1892         g_free (name);
1893         if (start_symbol) {
1894                 emit_pointer_unaligned (w, start_symbol);
1895                 emit_pointer_unaligned (w, end_symbol);
1896         } else {
1897                 emit_pointer_value (w, code);
1898                 emit_pointer_value (w, code + code_size);
1899         }
1900         /* frame_base */
1901         emit_byte (w, 2);
1902         emit_byte (w, DW_OP_breg6);
1903         emit_byte (w, 16);
1904
1905         /* Parameters */
1906         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1907                 MonoInst *arg = args ? args [i] : NULL;
1908                 MonoType *t;
1909                 const char *pname;
1910                 char pname_buf [128];
1911                 MonoMethodVar *vmv = NULL;
1912                 gboolean need_loclist = FALSE;
1913
1914                 vmv = find_vmv (cfg, arg);
1915                 if (code && vmv && (vmv->live_range_start || vmv->live_range_end))
1916                         need_loclist = TRUE;
1917
1918                 if (i == 0 && sig->hasthis) {
1919                         if (method->klass->valuetype)
1920                                 t = &method->klass->this_arg;
1921                         else
1922                                 t = &method->klass->byval_arg;
1923                         pname = "this";
1924                 } else {
1925                         t = sig->params [i - sig->hasthis];
1926                         pname = names [i - sig->hasthis];
1927                 }
1928
1929                 emit_uleb128 (w, need_loclist ? ABBREV_PARAM_LOCLIST : ABBREV_PARAM);
1930                 /* name */
1931                 if (pname[0] == '\0') {
1932                         sprintf (pname_buf, "param%d", i - sig->hasthis);
1933                         pname = pname_buf;
1934                 }
1935                 emit_string (w, pname);
1936                 /* type */
1937                 if (!arg || arg->flags & MONO_INST_IS_DEAD)
1938                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1939                 else
1940                         emit_var_type (w, t);
1941
1942                 p = buf;
1943                 encode_var_location (w, arg, p, &p);
1944                 if (need_loclist) {
1945                         vmv->live_range_start = 0;
1946                         if (vmv->live_range_end == 0)
1947                                 /* FIXME: Uses made in calls are not recorded */
1948                                 vmv->live_range_end = code_size;
1949                         emit_loclist (w, arg, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
1950                 } else {
1951                         emit_byte (w, p - buf);
1952                         emit_bytes (w, buf, p - buf);
1953                 }
1954         }
1955         g_free (names);
1956
1957         /* Locals */
1958         locals_info = mono_debug_lookup_locals (method);
1959
1960         for (i = 0; i < header->num_locals; ++i) {
1961                 MonoInst *ins = locals [i];
1962                 char name_buf [128];
1963                 int j;
1964                 MonoMethodVar *vmv = NULL;
1965                 gboolean need_loclist = FALSE;
1966                 char *lname;
1967
1968                 /* ins->dreg no longer contains the original vreg */
1969                 vmv = find_vmv (cfg, ins);
1970                 if (code && vmv) {
1971                         if (vmv->live_range_start) {
1972                                 /* This variable has a precise live range */
1973                                 need_loclist = TRUE;
1974                         }
1975                 }
1976
1977                 emit_uleb128 (w, need_loclist ? ABBREV_VARIABLE_LOCLIST : ABBREV_VARIABLE);
1978                 /* name */
1979                 lname = NULL;
1980                 if (locals_info) {
1981                         for (j = 0; j < locals_info->num_locals; ++j)
1982                                 if (locals_info->locals [j].index == i)
1983                                         break;
1984                         if (j < locals_info->num_locals)
1985                                 lname = locals_info->locals [j].name;
1986                 }
1987                 if (lname) {
1988                         emit_string (w, lname);
1989                 } else {
1990                         sprintf (name_buf, "V_%d", i);
1991                         emit_string (w, name_buf);
1992                 }
1993                 /* type */
1994                 if (!ins || ins->flags & MONO_INST_IS_DEAD)
1995                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1996                 else
1997                         emit_var_type (w, header->locals [i]);
1998
1999                 p = buf;
2000                 encode_var_location (w, ins, p, &p);
2001
2002                 if (need_loclist) {
2003                         if (vmv->live_range_end == 0)
2004                                 /* FIXME: Uses made in calls are not recorded */
2005                                 vmv->live_range_end = code_size;
2006                         emit_loclist (w, ins, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
2007                 } else {
2008                         emit_byte (w, p - buf);
2009                         emit_bytes (w, buf, p - buf);
2010                 }
2011         }
2012
2013         if (locals_info)
2014                 mono_debug_free_locals (locals_info);
2015
2016         /* Subprogram end */
2017         emit_uleb128 (w, 0x0);
2018
2019         emit_line (w);
2020
2021         emit_debug_info_end (w);
2022
2023         /* Emit unwind info */
2024         if (unwind_info) {
2025                 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, TRUE);
2026                 w->fde_index ++;
2027         }
2028
2029         /* Save the information needed to emit the line number info later at once */
2030         /* != could happen when using --regression */
2031         if (debug_info && (debug_info->code_start == code)) {
2032                 MethodLineNumberInfo *info;
2033
2034                 info = g_new0 (MethodLineNumberInfo, 1);
2035                 info->method = method;
2036                 info->start_symbol = g_strdup (start_symbol);
2037                 info->end_symbol = g_strdup (end_symbol);
2038                 info->code = code;
2039                 info->code_size = code_size;
2040                 w->line_info = g_slist_prepend (w->line_info, info);
2041         }
2042
2043         emit_line (w);
2044         mono_metadata_free_mh (header);
2045 }
2046
2047 void
2048 mono_dwarf_writer_emit_trampoline (MonoDwarfWriter *w, const char *tramp_name, char *start_symbol, char *end_symbol, guint8 *code, guint32 code_size, GSList *unwind_info)
2049 {
2050         emit_section_change (w, ".debug_info", 0);
2051
2052         /* Subprogram */
2053         emit_uleb128 (w, ABBREV_TRAMP_SUBPROGRAM);
2054         emit_string (w, tramp_name);
2055         emit_pointer_value (w, code);
2056         emit_pointer_value (w, code + code_size);
2057
2058         /* Subprogram end */
2059         emit_uleb128 (w, 0x0);
2060
2061         emit_debug_info_end (w);
2062
2063         /* Emit unwind info */
2064         emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, FALSE);
2065         w->fde_index ++;
2066 }
2067 #endif /* End of: !defined(DISABLE_AOT) && !defined(DISABLE_JIT) */