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/utils/mono-compiler.h>
  25
  26 #ifndef HOST_WIN32
  27 #include <mono/utils/freebsd-elf32.h>
  28 #include <mono/utils/freebsd-elf64.h>
  29 #endif
  30
  31 #include <mono/utils/freebsd-dwarf.h>
  32
  33 typedef struct {
  34         MonoMethod *method;
  35         char *start_symbol, *end_symbol;
  36         guint8 *code;
  37         guint32 code_size;
  38 } MethodLineNumberInfo;
  39
  40 struct _MonoDwarfWriter
  41 {
  42         MonoImageWriter *w;
  43         GHashTable *class_to_die, *class_to_vtype_die, *class_to_pointer_die;
  44         GHashTable *class_to_reference_die;
  45         int fde_index, tdie_index, line_number_file_index, line_number_dir_index;
  46         GHashTable *file_to_index, *index_to_file, *dir_to_index;
  47         FILE *il_file;
  48         int il_file_line_index, loclist_index;
  49         GSList *cie_program;
  50         FILE *fp;
  51         const char *temp_prefix;
  52         gboolean emit_line, appending, collect_line_info;
  53         GSList *line_info;
  54         int cur_file_index;
  55 };
  56
  57 static void
  58 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
  59                                            char *start_symbol, char *end_symbol,
  60                                            guint8 *code, guint32 code_size,
  61                                            MonoDebugMethodJitInfo *debug_info);
  62
  63 /*
  64  * mono_dwarf_writer_create:
  65  *
  66  *   Create a DWARF writer object. WRITER is the underlying image writer this
  67  * writer will emit to. IL_FILE is the file where IL code will be dumped to for
  68  * methods which have no line number info. It can be NULL.
  69  * If APPENDING is TRUE, the output file will be in assembleable state after each
  70  * call to the _emit_ functions. This is used for XDEBUG. If APPENDING is FALSE,
  71  * a separate mono_dwarf_writer_close () call is needed to finish the emission of
  72  * debug information.
  73  */
  74 MonoDwarfWriter*
  75 mono_dwarf_writer_create (MonoImageWriter *writer, FILE *il_file, int il_file_start_line, gboolean appending, gboolean emit_line_numbers)
  76 {
  77         MonoDwarfWriter *w = g_new0 (MonoDwarfWriter, 1);
  78
  79         /*
  80          * The appending flag is needed because we use subsections to order things in
  81          * the debug info, and:
  82          * - apple's assembler doesn't support them
  83          * - the binary writer has problems with subsections+alignment
  84          * So instead of subsections, we use the _close () function in AOT mode,
  85          * which writes out things in order.
  86          */
  87
  88         w->w = writer;
  89         w->il_file = il_file;
  90         w->il_file_line_index = il_file_start_line;
  91         w->appending = appending;
  92
  93         if (appending)
  94                 g_assert (img_writer_subsections_supported (w->w));
  95
  96         w->emit_line = TRUE;
  97
  98         if (appending) {
  99                 if (!img_writer_subsections_supported (w->w))
 100                         /* Can't emit line number info without subsections */
 101                         w->emit_line = FALSE;
 102         } else {
 103                 /* Collect line number info and emit it at once */
 104                 w->collect_line_info = TRUE;
 105         }
 106
 107         if (!emit_line_numbers) {
 108                 w->emit_line = FALSE;
 109                 w->collect_line_info = FALSE;
 110         }
 111
 112         w->fp = img_writer_get_fp (w->w);
 113         w->temp_prefix = img_writer_get_temp_label_prefix (w->w);
 114
 115         w->class_to_die = g_hash_table_new (NULL, NULL);
 116         w->class_to_vtype_die = g_hash_table_new (NULL, NULL);
 117         w->class_to_pointer_die = g_hash_table_new (NULL, NULL);
 118         w->class_to_reference_die = g_hash_table_new (NULL, NULL);
 119         w->cur_file_index = -1;
 120
 121         return w;
 122 }
 123
 124 void
 125 mono_dwarf_writer_destroy (MonoDwarfWriter *w)
 126 {
 127         g_free (w);
 128 }
 129
 130 int
 131 mono_dwarf_writer_get_il_file_line_index (MonoDwarfWriter *w)
 132 {
 133         return w->il_file_line_index;
 134 }
 135
 136 /* Wrappers around the image writer functions */
 137
 138 static inline void
 139 emit_section_change (MonoDwarfWriter *w, const char *section_name, int subsection_index)
 140 {
 141         img_writer_emit_section_change (w->w, section_name, subsection_index);
 142 }
 143
 144 static inline void
 145 emit_push_section (MonoDwarfWriter *w, const char *section_name, int subsection)
 146 {
 147         img_writer_emit_push_section (w->w, section_name, subsection);
 148 }
 149
 150 static inline void
 151 emit_pop_section (MonoDwarfWriter *w)
 152 {
 153         img_writer_emit_pop_section (w->w);
 154 }
 155
 156 static inline void
 157 emit_local_symbol (MonoDwarfWriter *w, const char *name, const char *end_label, gboolean func)
 158 {
 159         img_writer_emit_local_symbol (w->w, name, end_label, func);
 160 }
 161
 162 static inline void
 163 emit_label (MonoDwarfWriter *w, const char *name)
 164 {
 165         img_writer_emit_label (w->w, name);
 166 }
 167
 168 static inline void
 169 emit_bytes (MonoDwarfWriter *w, const guint8* buf, int size)
 170 {
 171         img_writer_emit_bytes (w->w, buf, size);
 172 }
 173
 174 static inline void
 175 emit_string (MonoDwarfWriter *w, const char *value)
 176 {
 177         img_writer_emit_string (w->w, value);
 178 }
 179
 180 static inline void
 181 emit_line (MonoDwarfWriter *w)
 182 {
 183         img_writer_emit_line (w->w);
 184 }
 185
 186 static inline void
 187 emit_alignment (MonoDwarfWriter *w, int size)
 188 {
 189         img_writer_emit_alignment (w->w, size);
 190 }
 191
 192 static inline void
 193 emit_pointer_unaligned (MonoDwarfWriter *w, const char *target)
 194 {
 195         img_writer_emit_pointer_unaligned (w->w, target);
 196 }
 197
 198 static inline void
 199 emit_pointer (MonoDwarfWriter *w, const char *target)
 200 {
 201         img_writer_emit_pointer (w->w, target);
 202 }
 203
 204 static inline void
 205 emit_int16 (MonoDwarfWriter *w, int value)
 206 {
 207         img_writer_emit_int16 (w->w, value);
 208 }
 209
 210 static inline void
 211 emit_int32 (MonoDwarfWriter *w, int value)
 212 {
 213         img_writer_emit_int32 (w->w, value);
 214 }
 215
 216 static inline void
 217 emit_symbol_diff (MonoDwarfWriter *w, const char *end, const char* start, int offset)
 218 {
 219         img_writer_emit_symbol_diff (w->w, end, start, offset);
 220 }
 221
 222 static inline void
 223 emit_zero_bytes (MonoDwarfWriter *w, int num)
 224 {
 225         img_writer_emit_zero_bytes (w->w, num);
 226 }
 227
 228 static inline void
 229 emit_byte (MonoDwarfWriter *w, guint8 val)
 230 {
 231         img_writer_emit_byte (w->w, val);
 232 }
 233
 234 static G_GNUC_UNUSED void
 235 emit_uleb128 (MonoDwarfWriter *w, guint32 value)
 236 {
 237         do {
 238                 guint8 b = value & 0x7f;
 239                 value >>= 7;
 240                 if (value != 0) /* more bytes to come */
 241                         b |= 0x80;
 242                 emit_byte (w, b);
 243         } while (value);
 244 }
 245
 246 static G_GNUC_UNUSED void
 247 emit_sleb128 (MonoDwarfWriter *w, gint64 value)
 248 {
 249         gboolean more = 1;
 250         gboolean negative = (value < 0);
 251         guint32 size = 64;
 252         guint8 byte;
 253
 254         while (more) {
 255                 byte = value & 0x7f;
 256                 value >>= 7;
 257                 /* the following is unnecessary if the
 258                  * implementation of >>= uses an arithmetic rather
 259                  * than logical shift for a signed left operand
 260                  */
 261                 if (negative)
 262                         /* sign extend */
 263                         value |= - ((gint64)1 <<(size - 7));
 264                 /* sign bit of byte is second high order bit (0x40) */
 265                 if ((value == 0 && !(byte & 0x40)) ||
 266                         (value == -1 && (byte & 0x40)))
 267                         more = 0;
 268                 else
 269                         byte |= 0x80;
 270                 emit_byte (w, byte);
 271         }
 272 }
 273
 274 static G_GNUC_UNUSED void
 275 encode_uleb128 (guint32 value, guint8 *buf, guint8 **endbuf)
 276 {
 277         guint8 *p = buf;
 278
 279         do {
 280                 guint8 b = value & 0x7f;
 281                 value >>= 7;
 282                 if (value != 0) /* more bytes to come */
 283                         b |= 0x80;
 284                 *p ++ = b;
 285         } while (value);
 286
 287         *endbuf = p;
 288 }
 289
 290 static G_GNUC_UNUSED void
 291 encode_sleb128 (gint32 value, guint8 *buf, guint8 **endbuf)
 292 {
 293         gboolean more = 1;
 294         gboolean negative = (value < 0);
 295         guint32 size = 32;
 296         guint8 byte;
 297         guint8 *p = buf;
 298
 299         while (more) {
 300                 byte = value & 0x7f;
 301                 value >>= 7;
 302                 /* the following is unnecessary if the
 303                  * implementation of >>= uses an arithmetic rather
 304                  * than logical shift for a signed left operand
 305                  */
 306                 if (negative)
 307                         /* sign extend */
 308                         value |= - (1 <<(size - 7));
 309                 /* sign bit of byte is second high order bit (0x40) */
 310                 if ((value == 0 && !(byte & 0x40)) ||
 311                         (value == -1 && (byte & 0x40)))
 312                         more = 0;
 313                 else
 314                         byte |= 0x80;
 315                 *p ++= byte;
 316         }
 317
 318         *endbuf = p;
 319 }
 320
 321 static void
 322 emit_dwarf_abbrev (MonoDwarfWriter *w, int code, int tag, gboolean has_child,
 323                                    int *attrs, int attrs_len)
 324 {
 325         int i;
 326
 327         emit_uleb128 (w, code);
 328         emit_uleb128 (w, tag);
 329         emit_byte (w, has_child);
 330
 331         for (i = 0; i < attrs_len; i++)
 332                 emit_uleb128 (w, attrs [i]);
 333         emit_uleb128 (w, 0);
 334         emit_uleb128 (w, 0);
 335 }
 336
 337 static void
 338 emit_cie (MonoDwarfWriter *w)
 339 {
 340         emit_section_change (w, ".debug_frame", 0);
 341
 342         emit_alignment (w, 8);
 343
 344         /* Emit a CIE */
 345         emit_symbol_diff (w, ".Lcie0_end", ".Lcie0_start", 0); /* length */
 346         emit_label (w, ".Lcie0_start");
 347         emit_int32 (w, 0xffffffff); /* CIE id */
 348         emit_byte (w, 3); /* version */
 349         emit_string (w, ""); /* augmention */
 350         emit_sleb128 (w, 1); /* code alignment factor */
 351         emit_sleb128 (w, mono_unwind_get_dwarf_data_align ()); /* data alignment factor */
 352         emit_uleb128 (w, mono_unwind_get_dwarf_pc_reg ());
 353
 354         w->cie_program = w->cie_program;
 355         if (w->cie_program) {
 356                 guint32 uw_info_len;
 357                 guint8 *uw_info = mono_unwind_ops_encode (w->cie_program, &uw_info_len);
 358                 emit_bytes (w, uw_info, uw_info_len);
 359                 g_free (uw_info);
 360         }
 361
 362         emit_alignment (w, sizeof (gpointer));
 363         emit_label (w, ".Lcie0_end");
 364 }
 365
 366 static void
 367 emit_pointer_value (MonoDwarfWriter *w, gpointer ptr)
 368 {
 369         gssize val = (gssize)ptr;
 370         emit_bytes (w, (guint8*)&val, sizeof (gpointer));
 371 }
 372
 373 static void
 374 emit_fde (MonoDwarfWriter *w, int fde_index, char *start_symbol, char *end_symbol,
 375                   guint8 *code, guint32 code_size, GSList *unwind_ops, gboolean use_cie)
 376 {
 377         char symbol1 [128];
 378         char symbol2 [128];
 379         GSList *l;
 380         guint8 *uw_info;
 381         guint32 uw_info_len;
 382
 383         emit_section_change (w, ".debug_frame", 0);
 384
 385         sprintf (symbol1, ".Lfde%d_start", fde_index);
 386         sprintf (symbol2, ".Lfde%d_end", fde_index);
 387         emit_symbol_diff (w, symbol2, symbol1, 0); /* length */
 388         emit_label (w, symbol1);
 389         emit_int32 (w, 0); /* CIE_pointer */
 390         if (start_symbol) {
 391                 emit_pointer (w, start_symbol); /* initial_location */
 392                 if (end_symbol)
 393                         emit_symbol_diff (w, end_symbol, start_symbol, 0); /* address_range */
 394                 else {
 395                         g_assert (code_size);
 396                         emit_int32 (w, code_size);
 397                 }
 398         } else {
 399                 emit_pointer_value (w, code);
 400                 emit_int32 (w, code_size);
 401         }
 402 #if SIZEOF_VOID_P == 8
 403         /* Upper 32 bits of code size */
 404         emit_int32 (w, 0);
 405 #endif
 406
 407         l = unwind_ops;
 408         if (w->cie_program) {
 409                 // FIXME: Check that the ops really begin with the CIE program */
 410                 int i;
 411
 412                 for (i = 0; i < g_slist_length (w->cie_program); ++i)
 413                         if (l)
 414                                 l = l->next;
 415         }
 416
 417         /* Convert the list of MonoUnwindOps to the format used by DWARF */
 418         uw_info = mono_unwind_ops_encode (l, &uw_info_len);
 419         emit_bytes (w, uw_info, uw_info_len);
 420         g_free (uw_info);
 421
 422         emit_alignment (w, sizeof (mgreg_t));
 423         emit_label (w, symbol2);
 424 }
 425
 426 /* Abbrevations */
 427 #define ABBREV_COMPILE_UNIT 1
 428 #define ABBREV_SUBPROGRAM 2
 429 #define ABBREV_PARAM 3
 430 #define ABBREV_BASE_TYPE 4
 431 #define ABBREV_STRUCT_TYPE 5
 432 #define ABBREV_DATA_MEMBER 6
 433 #define ABBREV_TYPEDEF 7
 434 #define ABBREV_ENUM_TYPE 8
 435 #define ABBREV_ENUMERATOR 9
 436 #define ABBREV_NAMESPACE 10
 437 #define ABBREV_VARIABLE 11
 438 #define ABBREV_VARIABLE_LOCLIST 12
 439 #define ABBREV_POINTER_TYPE 13
 440 #define ABBREV_REFERENCE_TYPE 14
 441 #define ABBREV_PARAM_LOCLIST 15
 442 #define ABBREV_INHERITANCE 16
 443 #define ABBREV_STRUCT_TYPE_NOCHILDREN 17
 444 #define ABBREV_TRAMP_SUBPROGRAM 18
 445
 446 static int compile_unit_attr [] = {
 447         DW_AT_producer     ,DW_FORM_string,
 448     DW_AT_name         ,DW_FORM_string,
 449     DW_AT_comp_dir     ,DW_FORM_string,
 450         DW_AT_language     ,DW_FORM_data1,
 451     DW_AT_low_pc       ,DW_FORM_addr,
 452     DW_AT_high_pc      ,DW_FORM_addr,
 453         DW_AT_stmt_list    ,DW_FORM_data4
 454 };
 455
 456 static int subprogram_attr [] = {
 457         DW_AT_name         , DW_FORM_string,
 458 #ifndef TARGET_IOS
 459         DW_AT_description  , DW_FORM_string,
 460 #endif
 461     DW_AT_low_pc       , DW_FORM_addr,
 462     DW_AT_high_pc      , DW_FORM_addr,
 463         DW_AT_frame_base   , DW_FORM_block1
 464 };
 465
 466 static int tramp_subprogram_attr [] = {
 467         DW_AT_name         , DW_FORM_string,
 468     DW_AT_low_pc       , DW_FORM_addr,
 469     DW_AT_high_pc      , DW_FORM_addr,
 470 };
 471
 472 static int param_attr [] = {
 473         DW_AT_name,     DW_FORM_string,
 474         DW_AT_type,     DW_FORM_ref4,
 475         DW_AT_location, DW_FORM_block1
 476 };
 477
 478 static int param_loclist_attr [] = {
 479         DW_AT_name,     DW_FORM_string,
 480         DW_AT_type,     DW_FORM_ref4,
 481         DW_AT_location, DW_FORM_data4
 482 };
 483
 484 static int base_type_attr [] = {
 485         DW_AT_byte_size,   DW_FORM_data1,
 486         DW_AT_encoding,    DW_FORM_data1,
 487         DW_AT_name,        DW_FORM_string
 488 };
 489
 490 static int struct_type_attr [] = {
 491         DW_AT_name,        DW_FORM_string,
 492         DW_AT_byte_size,   DW_FORM_udata,
 493 };
 494
 495 static int data_member_attr [] = {
 496         DW_AT_name,        DW_FORM_string,
 497         DW_AT_type,        DW_FORM_ref4,
 498         DW_AT_data_member_location, DW_FORM_block1
 499 };
 500
 501 static int typedef_attr [] = {
 502         DW_AT_name,        DW_FORM_string,
 503         DW_AT_type,        DW_FORM_ref4
 504 };
 505
 506 static int pointer_type_attr [] = {
 507         DW_AT_type,        DW_FORM_ref4,
 508 };
 509
 510 static int reference_type_attr [] = {
 511         DW_AT_type,        DW_FORM_ref4,
 512 };
 513
 514 static int enum_type_attr [] = {
 515         DW_AT_name,        DW_FORM_string,
 516         DW_AT_byte_size,   DW_FORM_udata,
 517         DW_AT_type,        DW_FORM_ref4,
 518 };
 519
 520 static int enumerator_attr [] = {
 521         DW_AT_name,        DW_FORM_string,
 522         DW_AT_const_value, DW_FORM_sdata,
 523 };
 524
 525 static int namespace_attr [] = {
 526         DW_AT_name,        DW_FORM_string,
 527 };
 528
 529 static int variable_attr [] = {
 530         DW_AT_name,     DW_FORM_string,
 531         DW_AT_type,     DW_FORM_ref4,
 532         DW_AT_location, DW_FORM_block1
 533 };
 534
 535 static int variable_loclist_attr [] = {
 536         DW_AT_name,     DW_FORM_string,
 537         DW_AT_type,     DW_FORM_ref4,
 538         DW_AT_location, DW_FORM_data4
 539 };
 540
 541 static int inheritance_attr [] = {
 542         DW_AT_type,        DW_FORM_ref4,
 543         DW_AT_data_member_location, DW_FORM_block1
 544 };
 545
 546 typedef struct DwarfBasicType {
 547         const char *die_name, *name;
 548         int type;
 549         int size;
 550         int encoding;
 551 } DwarfBasicType;
 552
 553 static DwarfBasicType basic_types [] = {
 554         { ".LDIE_I1", "sbyte", MONO_TYPE_I1, 1, DW_ATE_signed },
 555         { ".LDIE_U1", "byte", MONO_TYPE_U1, 1, DW_ATE_unsigned },
 556         { ".LDIE_I2", "short", MONO_TYPE_I2, 2, DW_ATE_signed },
 557         { ".LDIE_U2", "ushort", MONO_TYPE_U2, 2, DW_ATE_unsigned },
 558         { ".LDIE_I4", "int", MONO_TYPE_I4, 4, DW_ATE_signed },
 559         { ".LDIE_U4", "uint", MONO_TYPE_U4, 4, DW_ATE_unsigned },
 560         { ".LDIE_I8", "long", MONO_TYPE_I8, 8, DW_ATE_signed },
 561         { ".LDIE_U8", "ulong", MONO_TYPE_U8, 8, DW_ATE_unsigned },
 562         { ".LDIE_I", "intptr", MONO_TYPE_I, SIZEOF_VOID_P, DW_ATE_signed },
 563         { ".LDIE_U", "uintptr", MONO_TYPE_U, SIZEOF_VOID_P, DW_ATE_unsigned },
 564         { ".LDIE_R4", "float", MONO_TYPE_R4, 4, DW_ATE_float },
 565         { ".LDIE_R8", "double", MONO_TYPE_R8, 8, DW_ATE_float },
 566         { ".LDIE_BOOLEAN", "boolean", MONO_TYPE_BOOLEAN, 1, DW_ATE_boolean },
 567         { ".LDIE_CHAR", "char", MONO_TYPE_CHAR, 2, DW_ATE_unsigned_char },
 568         { ".LDIE_STRING", "string", MONO_TYPE_STRING, sizeof (gpointer), DW_ATE_address },
 569         { ".LDIE_OBJECT", "object", MONO_TYPE_OBJECT, sizeof (gpointer), DW_ATE_address },
 570         { ".LDIE_SZARRAY", "object", MONO_TYPE_SZARRAY, sizeof (gpointer), DW_ATE_address },
 571 };
 572
 573 /* Constants for encoding line number special opcodes */
 574 #define OPCODE_BASE 13
 575 #define LINE_BASE -5
 576 #define LINE_RANGE 14
 577
 578 /* Subsections of the .debug_line section */
 579 #define LINE_SUBSECTION_HEADER 1
 580 #define LINE_SUBSECTION_INCLUDES 2
 581 #define LINE_SUBSECTION_FILES 3
 582 #define LINE_SUBSECTION_DATA 4
 583 #define LINE_SUBSECTION_END 5
 584
 585 static int
 586 emit_line_number_file_name (MonoDwarfWriter *w, const char *name,
 587                                                         gint64 last_mod_time, gint64 file_size)
 588 {
 589         int index;
 590         int dir_index;
 591         char *basename = NULL;
 592
 593         if (!w->file_to_index)
 594                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 595
 596         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 597         if (index > 0)
 598                 return index;
 599
 600         if (g_path_is_absolute (name)) {
 601                 char *dir = g_path_get_dirname (name);
 602
 603                 if (!w->dir_to_index)
 604                         w->dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 605
 606                 dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (w->dir_to_index, dir));
 607                 if (dir_index == 0) {
 608                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 609                         emit_string (w, dir);
 610
 611                         dir_index = ++ w->line_number_dir_index;
 612                         g_hash_table_insert (w->dir_to_index, g_strdup (dir), GUINT_TO_POINTER (dir_index));
 613                 }
 614
 615                 g_free (dir);
 616
 617                 basename = g_path_get_basename (name);
 618         } else {
 619                 dir_index = 0;
 620         }
 621
 622         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 623
 624         if (basename)
 625                 emit_string (w, basename);
 626         else
 627                 emit_string (w, name);
 628         emit_uleb128 (w, dir_index);
 629         emit_byte (w, 0);
 630         emit_byte (w, 0);
 631
 632         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 633
 634         if (basename)
 635                 g_free (basename);
 636
 637         index = ++ w->line_number_file_index;
 638         g_hash_table_insert (w->file_to_index, g_strdup (name), GUINT_TO_POINTER (index));
 639
 640         return index;
 641 }
 642
 643 static int
 644 get_line_number_file_name (MonoDwarfWriter *w, const char *name)
 645 {
 646         int index;
 647
 648         g_assert (w->file_to_index);
 649         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 650         g_assert (index > 0);
 651         return index - 1;
 652 }
 653
 654 static int
 655 add_line_number_file_name (MonoDwarfWriter *w, const char *name,
 656                                                    gint64 last_mod_time, gint64 file_size)
 657 {
 658         int index;
 659         char *copy;
 660
 661         if (!w->file_to_index) {
 662                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 663                 w->index_to_file = g_hash_table_new (NULL, NULL);
 664         }
 665
 666         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 667         if (index > 0)
 668                 return index - 1;
 669         index = w->line_number_file_index;
 670         w->line_number_file_index ++;
 671         copy = g_strdup (name);
 672         g_hash_table_insert (w->file_to_index, copy, GUINT_TO_POINTER (index + 1));
 673         g_hash_table_insert (w->index_to_file, GUINT_TO_POINTER (index + 1), copy);
 674
 675         return index;
 676 }
 677
 678 static void
 679 emit_line_number_info_begin (MonoDwarfWriter *w)
 680 {
 681         /* Line number info header */
 682         /*
 683          * GAS seems to emit its own data to the end of the first subsection, so we use
 684          * subsections 1, 2 etc:
 685          * 1 - contains the header
 686          * 2 - contains the file names
 687          * 3 - contains the end of the header + the data
 688          * 4 - the end symbol
 689          */
 690         emit_section_change (w, ".debug_line", 0);
 691         emit_label (w, ".Ldebug_line_section_start");
 692         emit_section_change (w, ".debug_line", LINE_SUBSECTION_HEADER);
 693         emit_label (w, ".Ldebug_line_start");
 694         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 695         emit_int16 (w, 0x2); /* version */
 696         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 697         emit_byte (w, 1); /* minimum_instruction_length */
 698         emit_byte (w, 1); /* default_is_stmt */
 699         emit_byte (w, LINE_BASE); /* line_base */
 700         emit_byte (w, LINE_RANGE); /* line_range */
 701         emit_byte (w, OPCODE_BASE); /* opcode_base */
 702         emit_byte (w, 0); /* standard_opcode_lengths */
 703         emit_byte (w, 1);
 704         emit_byte (w, 1);
 705         emit_byte (w, 1);
 706         emit_byte (w, 1);
 707         emit_byte (w, 0);
 708         emit_byte (w, 0);
 709         emit_byte (w, 0);
 710         emit_byte (w, 1);
 711         emit_byte (w, 0);
 712         emit_byte (w, 0);
 713         emit_byte (w, 1);
 714
 715         /* Includes */
 716         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 717
 718         /* End of Includes */
 719         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 720         emit_byte (w, 0);
 721
 722         /* Files */
 723         emit_line_number_file_name (w, "xdb.il", 0, 0);
 724
 725         /* End of Files */
 726         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 727         emit_byte (w, 0);
 728
 729         emit_label (w, ".Ldebug_line_header_end");
 730
 731         /* Emit this into a separate subsection so it gets placed at the end */
 732         emit_section_change (w, ".debug_line", LINE_SUBSECTION_END);
 733
 734         emit_byte (w, 0);
 735         emit_byte (w, 1);
 736         emit_byte (w, DW_LNE_end_sequence);
 737
 738         emit_label (w, ".Ldebug_line_end");
 739 }
 740
 741 char *
 742 mono_dwarf_escape_path (const char *name)
 743 {
 744         if (strchr (name, '\\')) {
 745                 char *s;
 746                 int len, i, j;
 747
 748                 len = strlen (name);
 749                 s = g_malloc0 ((len + 1) * 2);
 750                 j = 0;
 751                 for (i = 0; i < len; ++i) {
 752                         if (name [i] == '\\') {
 753                                 s [j ++] = '\\';
 754                                 s [j ++] = '\\';
 755                         } else {
 756                                 s [j ++] = name [i];
 757                         }
 758                 }
 759                 return s;
 760         }
 761         return g_strdup (name);
 762 }
 763
 764 static void
 765 emit_all_line_number_info (MonoDwarfWriter *w)
 766 {
 767         int i;
 768         GHashTable *dir_to_index, *index_to_dir;
 769         GSList *l;
 770         GSList *info_list;
 771
 772         g_assert (w->collect_line_info);
 773
 774         add_line_number_file_name (w, "<unknown>", 0, 0);
 775
 776         /* Collect files */
 777         info_list = g_slist_reverse (w->line_info);
 778         for (l = info_list; l; l = l->next) {
 779                 MethodLineNumberInfo *info = l->data;
 780                 MonoDebugMethodInfo *minfo;
 781                 char *source_file;
 782                 GPtrArray *source_file_list;
 783
 784                 // FIXME: Free stuff
 785                 minfo = mono_debug_lookup_method (info->method);
 786                 if (!minfo)
 787                         continue;
 788
 789                 mono_debug_symfile_get_line_numbers_full (minfo, &source_file, &source_file_list, NULL, NULL, NULL, NULL, NULL);
 790                 for (i = 0; i < source_file_list->len; ++i) {
 791                         MonoDebugSourceInfo *sinfo = g_ptr_array_index (source_file_list, i);
 792                         add_line_number_file_name (w, sinfo->source_file, 0, 0);
 793                 }
 794         }
 795
 796         /* Preprocess files */
 797         dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 798         index_to_dir = g_hash_table_new (NULL, NULL);
 799         for (i = 0; i < w->line_number_file_index; ++i) {
 800                 char *name = g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 801                 char *copy;
 802                 int dir_index = 0;
 803
 804                 if (g_path_is_absolute (name)) {
 805                         char *dir = g_path_get_dirname (name);
 806
 807                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 808                         if (dir_index == 0) {
 809                                 dir_index = w->line_number_dir_index;
 810                                 w->line_number_dir_index ++;
 811                                 copy = g_strdup (dir);
 812                                 g_hash_table_insert (dir_to_index, copy, GUINT_TO_POINTER (dir_index + 1));
 813                                 g_hash_table_insert (index_to_dir, GUINT_TO_POINTER (dir_index + 1), copy);
 814                         } else {
 815                                 dir_index --;
 816                         }
 817
 818                         g_free (dir);
 819                 }
 820         }
 821
 822         /* Line number info header */
 823         emit_section_change (w, ".debug_line", 0);
 824         emit_label (w, ".Ldebug_line_section_start");
 825         emit_label (w, ".Ldebug_line_start");
 826         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 827         emit_int16 (w, 0x2); /* version */
 828         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 829         emit_byte (w, 1); /* minimum_instruction_length */
 830         emit_byte (w, 1); /* default_is_stmt */
 831         emit_byte (w, LINE_BASE); /* line_base */
 832         emit_byte (w, LINE_RANGE); /* line_range */
 833         emit_byte (w, OPCODE_BASE); /* opcode_base */
 834         emit_byte (w, 0); /* standard_opcode_lengths */
 835         emit_byte (w, 1);
 836         emit_byte (w, 1);
 837         emit_byte (w, 1);
 838         emit_byte (w, 1);
 839         emit_byte (w, 0);
 840         emit_byte (w, 0);
 841         emit_byte (w, 0);
 842         emit_byte (w, 1);
 843         emit_byte (w, 0);
 844         emit_byte (w, 0);
 845         emit_byte (w, 1);
 846
 847         /* Includes */
 848         emit_section_change (w, ".debug_line", 0);
 849         for (i = 0; i < w->line_number_dir_index; ++i) {
 850                 char *dir = g_hash_table_lookup (index_to_dir, GUINT_TO_POINTER (i + 1));
 851
 852                 emit_string (w, mono_dwarf_escape_path (dir));
 853         }
 854         /* End of Includes */
 855         emit_byte (w, 0);
 856
 857         /* Files */
 858         for (i = 0; i < w->line_number_file_index; ++i) {
 859                 char *name = g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 860                 char *basename = NULL, *dir;
 861                 int dir_index = 0;
 862
 863                 if (g_path_is_absolute (name)) {
 864                         dir = g_path_get_dirname (name);
 865
 866                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 867                         basename = g_path_get_basename (name);
 868                 }
 869
 870                 if (basename)
 871                         emit_string (w, basename);
 872                 else
 873                         emit_string (w, mono_dwarf_escape_path (name));
 874                 emit_uleb128 (w, dir_index);
 875                 emit_byte (w, 0);
 876                 emit_byte (w, 0);
 877         }
 878
 879         /* End of Files */
 880         emit_byte (w, 0);
 881
 882         emit_label (w, ".Ldebug_line_header_end");
 883
 884         /* Emit line number table */
 885         for (l = info_list; l; l = l->next) {
 886                 MethodLineNumberInfo *info = l->data;
 887                 MonoDebugMethodJitInfo *dmji;
 888
 889                 dmji = mono_debug_find_method (info->method, mono_domain_get ());;
 890                 emit_line_number_info (w, info->method, info->start_symbol, info->end_symbol, info->code, info->code_size, dmji);
 891                 mono_debug_free_method_jit_info (dmji);
 892         }
 893         g_slist_free (info_list);
 894
 895         emit_byte (w, 0);
 896         emit_byte (w, 1);
 897         emit_byte (w, DW_LNE_end_sequence);
 898
 899         emit_label (w, ".Ldebug_line_end");
 900 }
 901
 902 /*
 903  * Some assemblers like apple's do not support subsections, so we can't place
 904  * .Ldebug_info_end at the end of the section using subsections. Instead, we
 905  * define it every time something gets added to the .debug_info section.
 906  * The apple assember seems to use the last definition.
 907  */
 908 static void
 909 emit_debug_info_end (MonoDwarfWriter *w)
 910 {
 911         /* This doesn't seem to work/required with recent iphone sdk versions */
 912 #if 0
 913         if (!img_writer_subsections_supported (w->w))
 914                 fprintf (w->fp, "\n.set %sdebug_info_end,.\n", w->temp_prefix);
 915 #endif
 916 }
 917
 918 void
 919 mono_dwarf_writer_emit_base_info (MonoDwarfWriter *w, GSList *base_unwind_program)
 920 {
 921         char *s, *build_info;
 922         int i;
 923
 924         w->cie_program = base_unwind_program;
 925
 926         emit_section_change (w, ".debug_abbrev", 0);
 927         emit_dwarf_abbrev (w, ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, TRUE,
 928                                            compile_unit_attr, G_N_ELEMENTS (compile_unit_attr));
 929         emit_dwarf_abbrev (w, ABBREV_SUBPROGRAM, DW_TAG_subprogram, TRUE,
 930                                            subprogram_attr, G_N_ELEMENTS (subprogram_attr));
 931         emit_dwarf_abbrev (w, ABBREV_PARAM, DW_TAG_formal_parameter, FALSE,
 932                                            param_attr, G_N_ELEMENTS (param_attr));
 933         emit_dwarf_abbrev (w, ABBREV_PARAM_LOCLIST, DW_TAG_formal_parameter, FALSE,
 934                                            param_loclist_attr, G_N_ELEMENTS (param_loclist_attr));
 935         emit_dwarf_abbrev (w, ABBREV_BASE_TYPE, DW_TAG_base_type, FALSE,
 936                                            base_type_attr, G_N_ELEMENTS (base_type_attr));
 937         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE, DW_TAG_class_type, TRUE,
 938                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 939         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE_NOCHILDREN, DW_TAG_class_type, FALSE,
 940                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 941         emit_dwarf_abbrev (w, ABBREV_DATA_MEMBER, DW_TAG_member, FALSE,
 942                                            data_member_attr, G_N_ELEMENTS (data_member_attr));
 943         emit_dwarf_abbrev (w, ABBREV_TYPEDEF, DW_TAG_typedef, FALSE,
 944                                            typedef_attr, G_N_ELEMENTS (typedef_attr));
 945         emit_dwarf_abbrev (w, ABBREV_ENUM_TYPE, DW_TAG_enumeration_type, TRUE,
 946                                            enum_type_attr, G_N_ELEMENTS (enum_type_attr));
 947         emit_dwarf_abbrev (w, ABBREV_ENUMERATOR, DW_TAG_enumerator, FALSE,
 948                                            enumerator_attr, G_N_ELEMENTS (enumerator_attr));
 949         emit_dwarf_abbrev (w, ABBREV_NAMESPACE, DW_TAG_namespace, TRUE,
 950                                            namespace_attr, G_N_ELEMENTS (namespace_attr));
 951         emit_dwarf_abbrev (w, ABBREV_VARIABLE, DW_TAG_variable, FALSE,
 952                                            variable_attr, G_N_ELEMENTS (variable_attr));
 953         emit_dwarf_abbrev (w, ABBREV_VARIABLE_LOCLIST, DW_TAG_variable, FALSE,
 954                                            variable_loclist_attr, G_N_ELEMENTS (variable_loclist_attr));
 955         emit_dwarf_abbrev (w, ABBREV_POINTER_TYPE, DW_TAG_pointer_type, FALSE,
 956                                            pointer_type_attr, G_N_ELEMENTS (pointer_type_attr));
 957         emit_dwarf_abbrev (w, ABBREV_REFERENCE_TYPE, DW_TAG_reference_type, FALSE,
 958                                            reference_type_attr, G_N_ELEMENTS (reference_type_attr));
 959         emit_dwarf_abbrev (w, ABBREV_INHERITANCE, DW_TAG_inheritance, FALSE,
 960                                            inheritance_attr, G_N_ELEMENTS (inheritance_attr));
 961         emit_dwarf_abbrev (w, ABBREV_TRAMP_SUBPROGRAM, DW_TAG_subprogram, FALSE,
 962                                            tramp_subprogram_attr, G_N_ELEMENTS (tramp_subprogram_attr));
 963         emit_byte (w, 0);
 964
 965         emit_section_change (w, ".debug_info", 0);
 966         emit_label (w, ".Ldebug_info_start");
 967         emit_symbol_diff (w, ".Ldebug_info_end", ".Ldebug_info_begin", 0); /* length */
 968         emit_label (w, ".Ldebug_info_begin");
 969         emit_int16 (w, 0x2); /* DWARF version 2 */
 970         emit_int32 (w, 0); /* .debug_abbrev offset */
 971         emit_byte (w, sizeof (gpointer)); /* address size */
 972
 973         if (img_writer_subsections_supported (w->w) && w->appending) {
 974                 /* Emit this into a separate section so it gets placed at the end */
 975                 emit_section_change (w, ".debug_info", 1);
 976                 emit_byte (w, 0); /* close COMPILE_UNIT */
 977                 emit_label (w, ".Ldebug_info_end");
 978                 emit_section_change (w, ".debug_info", 0);
 979         }
 980
 981         /* Compilation unit */
 982         emit_uleb128 (w, ABBREV_COMPILE_UNIT);
 983         build_info = mono_get_runtime_build_info ();
 984         s = g_strdup_printf ("Mono AOT Compiler %s", build_info);
 985         emit_string (w, s);
 986         g_free (build_info);
 987         g_free (s);
 988         emit_string (w, "JITted code");
 989         emit_string (w, "");
 990         emit_byte (w, DW_LANG_C);
 991         emit_pointer_value (w, 0);
 992         emit_pointer_value (w, 0);
 993         /* offset into .debug_line section */
 994         if (w->emit_line)
 995                 emit_symbol_diff (w, ".Ldebug_line_start", ".Ldebug_line_section_start", 0);
 996         else
 997                 emit_pointer_value (w, 0);
 998
 999         /* Base types */
1000         for (i = 0; i < G_N_ELEMENTS (basic_types); ++i) {
1001                 emit_label (w, basic_types [i].die_name);
1002                 emit_uleb128 (w, ABBREV_BASE_TYPE);
1003                 emit_byte (w, basic_types [i].size);
1004                 emit_byte (w, basic_types [i].encoding);
1005                 emit_string (w, basic_types [i].name);
1006         }
1007
1008         emit_debug_info_end (w);
1009
1010         /* debug_loc section */
1011         emit_section_change (w, ".debug_loc", 0);
1012         emit_label (w, ".Ldebug_loc_start");
1013
1014         emit_cie (w);
1015 }
1016
1017 /*
1018  * mono_dwarf_writer_close:
1019  *
1020  *   Finalize the emitted debugging info.
1021  */
1022 void
1023 mono_dwarf_writer_close (MonoDwarfWriter *w)
1024 {
1025         if (!w->appending) {
1026                 emit_section_change (w, ".debug_info", 0);
1027                 emit_byte (w, 0); /* close COMPILE_UNIT */
1028                 emit_label (w, ".Ldebug_info_end");
1029         }
1030
1031         if (w->collect_line_info)
1032                 emit_all_line_number_info (w);
1033 }
1034
1035 static void emit_type (MonoDwarfWriter *w, MonoType *t);
1036 static const char* get_type_die (MonoDwarfWriter *w, MonoType *t);
1037
1038 static const char*
1039 get_class_die (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1040 {
1041         GHashTable *cache;
1042
1043         if (vtype)
1044                 cache = w->class_to_vtype_die;
1045         else
1046                 cache = w->class_to_die;
1047
1048         return g_hash_table_lookup (cache, klass);
1049 }
1050
1051 /* Returns the local symbol pointing to the emitted debug info */
1052 static char*
1053 emit_class_dwarf_info (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1054 {
1055         char *die, *pointer_die, *reference_die;
1056         char *full_name, *p;
1057         gpointer iter;
1058         MonoClassField *field;
1059         const char *fdie;
1060         int k;
1061         gboolean emit_namespace = FALSE, has_children;
1062         GHashTable *cache;
1063
1064         if (vtype)
1065                 cache = w->class_to_vtype_die;
1066         else
1067                 cache = w->class_to_die;
1068
1069         die = g_hash_table_lookup (cache, klass);
1070         if (die)
1071                 return die;
1072
1073         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) ||
1074                   (klass->byval_arg.type >= MONO_TYPE_BOOLEAN && klass->byval_arg.type <= MONO_TYPE_R8 && !vtype)))
1075                 return NULL;
1076
1077         /*
1078          * FIXME: gdb can't handle namespaces in languages it doesn't know about.
1079          */
1080         /*
1081         if (klass->name_space && klass->name_space [0] != '\0')
1082                 emit_namespace = TRUE;
1083         */
1084         if (emit_namespace) {
1085                 emit_uleb128 (w, ABBREV_NAMESPACE);
1086                 emit_string (w, klass->name_space);
1087         }
1088
1089         full_name = g_strdup_printf ("%s%s%s", klass->name_space, klass->name_space ? "." : "", klass->name);
1090         /*
1091          * gdb doesn't support namespaces for non-C++ dwarf objects, so use _
1092          * to separate components.
1093          */
1094         for (p = full_name; *p; p ++)
1095                 if (*p == '.')
1096                         *p = '_';
1097
1098         die = g_strdup_printf (".LTDIE_%d", w->tdie_index);
1099         pointer_die = g_strdup_printf (".LTDIE_%d_POINTER", w->tdie_index);
1100         reference_die = g_strdup_printf (".LTDIE_%d_REFERENCE", w->tdie_index);
1101         w->tdie_index ++;
1102
1103         g_hash_table_insert (w->class_to_pointer_die, klass, pointer_die);
1104         g_hash_table_insert (w->class_to_reference_die, klass, reference_die);
1105         g_hash_table_insert (cache, klass, die);
1106
1107         if (klass->enumtype) {
1108                 int size = mono_class_value_size (mono_class_from_mono_type (mono_class_enum_basetype (klass)), NULL);
1109
1110                 emit_label (w, die);
1111
1112                 emit_uleb128 (w, ABBREV_ENUM_TYPE);
1113                 emit_string (w, full_name);
1114                 emit_uleb128 (w, size);
1115                 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
1116                         if (basic_types [k].type == mono_class_enum_basetype (klass)->type)
1117                                 break;
1118                 g_assert (k < G_N_ELEMENTS (basic_types));
1119                 emit_symbol_diff (w, basic_types [k].die_name, ".Ldebug_info_start", 0);
1120
1121                 /* Emit enum values */
1122                 iter = NULL;
1123                 while ((field = mono_class_get_fields (klass, &iter))) {
1124                         const char *p;
1125                         int len;
1126                         MonoTypeEnum def_type;
1127
1128                         if (strcmp ("value__", mono_field_get_name (field)) == 0)
1129                                 continue;
1130                         if (mono_field_is_deleted (field))
1131                                 continue;
1132
1133                         emit_uleb128 (w, ABBREV_ENUMERATOR);
1134                         emit_string (w, mono_field_get_name (field));
1135
1136                         p = mono_class_get_field_default_value (field, &def_type);
1137                         len = mono_metadata_decode_blob_size (p, &p);
1138                         switch (mono_class_enum_basetype (klass)->type) {
1139                         case MONO_TYPE_U1:
1140                         case MONO_TYPE_I1:
1141                         case MONO_TYPE_BOOLEAN:
1142                                 emit_sleb128 (w, *p);
1143                                 break;
1144                         case MONO_TYPE_U2:
1145                         case MONO_TYPE_I2:
1146                         case MONO_TYPE_CHAR:
1147                                 emit_sleb128 (w, read16 (p));
1148                                 break;
1149                         case MONO_TYPE_U4:
1150                         case MONO_TYPE_I4:
1151                                 emit_sleb128 (w, read32 (p));
1152                                 break;
1153                         case MONO_TYPE_U8:
1154                         case MONO_TYPE_I8:
1155                                 emit_sleb128 (w, read64 (p));
1156                                 break;
1157                         case MONO_TYPE_I:
1158                         case MONO_TYPE_U:
1159 #if SIZEOF_VOID_P == 8
1160                                 emit_sleb128 (w, read64 (p));
1161 #else
1162                                 emit_sleb128 (w, read32 (p));
1163 #endif
1164                                 break;
1165                         default:
1166                                 g_assert_not_reached ();
1167                         }
1168                 }
1169
1170                 has_children = TRUE;
1171         } else {
1172                 guint8 buf [128];
1173                 guint8 *p;
1174                 char *parent_die;
1175
1176                 if (klass->parent)
1177                         parent_die = emit_class_dwarf_info (w, klass->parent, FALSE);
1178                 else
1179                         parent_die = NULL;
1180
1181                 /* Emit field types */
1182                 iter = NULL;
1183                 while ((field = mono_class_get_fields (klass, &iter))) {
1184                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1185                                 continue;
1186
1187                         emit_type (w, field->type);
1188                 }
1189
1190                 iter = NULL;
1191                 has_children = parent_die || mono_class_get_fields (klass, &iter);
1192
1193                 emit_label (w, die);
1194
1195                 emit_uleb128 (w, has_children ? ABBREV_STRUCT_TYPE : ABBREV_STRUCT_TYPE_NOCHILDREN);
1196                 emit_string (w, full_name);
1197                 emit_uleb128 (w, klass->instance_size);
1198
1199                 if (parent_die) {
1200                         emit_uleb128 (w, ABBREV_INHERITANCE);
1201                         emit_symbol_diff (w, parent_die, ".Ldebug_info_start", 0);
1202
1203                         p = buf;
1204                         *p ++= DW_OP_plus_uconst;
1205                         encode_uleb128 (0, p, &p);
1206                         emit_byte (w, p - buf);
1207                         emit_bytes (w, buf, p - buf);
1208                 }
1209
1210                 /* Emit fields */
1211                 iter = NULL;
1212                 while ((field = mono_class_get_fields (klass, &iter))) {
1213                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1214                                 continue;
1215
1216                         fdie = get_type_die (w, field->type);
1217                         if (fdie) {
1218                                 emit_uleb128 (w, ABBREV_DATA_MEMBER);
1219                                 emit_string (w, field->name);
1220                                 emit_symbol_diff (w, fdie, ".Ldebug_info_start", 0);
1221                                 /* location */
1222                                 p = buf;
1223                                 *p ++= DW_OP_plus_uconst;
1224                                 if (klass->valuetype && vtype)
1225                                         encode_uleb128 (field->offset - sizeof (MonoObject), p, &p);
1226                                 else
1227                                         encode_uleb128 (field->offset, p, &p);
1228
1229                                 emit_byte (w, p - buf);
1230                                 emit_bytes (w, buf, p - buf);
1231                         }
1232                 }
1233         }
1234
1235         /* Type end */
1236         if (has_children)
1237                 emit_uleb128 (w, 0x0);
1238
1239         /* Add a typedef, so we can reference the type without a 'struct' in gdb */
1240         emit_uleb128 (w, ABBREV_TYPEDEF);
1241         emit_string (w, full_name);
1242         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1243
1244         /* Add a pointer type */
1245         emit_label (w, pointer_die);
1246
1247         emit_uleb128 (w, ABBREV_POINTER_TYPE);
1248         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1249
1250         /* Add a reference type */
1251         emit_label (w, reference_die);
1252
1253         emit_uleb128 (w, ABBREV_REFERENCE_TYPE);
1254         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1255
1256         g_free (full_name);
1257
1258         if (emit_namespace) {
1259                 /* Namespace end */
1260                 emit_uleb128 (w, 0x0);
1261         }
1262
1263         return die;
1264 }
1265
1266 static gboolean base_types_emitted [64];
1267
1268 static const char*
1269 get_type_die (MonoDwarfWriter *w, MonoType *t)
1270 {
1271         MonoClass *klass = mono_class_from_mono_type (t);
1272         int j;
1273         const char *tdie;
1274
1275         if (t->byref) {
1276                 if (t->type == MONO_TYPE_VALUETYPE) {
1277                         tdie = g_hash_table_lookup (w->class_to_pointer_die, klass);
1278                 }
1279                 else {
1280                         tdie = get_class_die (w, klass, FALSE);
1281                         /* Should return a pointer type to a reference */
1282                 }
1283                 // FIXME:
1284                 t = &mono_defaults.int_class->byval_arg;
1285         }
1286         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1287                 if (basic_types [j].type == t->type)
1288                         break;
1289         if (j < G_N_ELEMENTS (basic_types)) {
1290                 tdie = basic_types [j].die_name;
1291         } else {
1292                 switch (t->type) {
1293                 case MONO_TYPE_CLASS:
1294                         tdie = g_hash_table_lookup (w->class_to_reference_die, klass);
1295                         //tdie = ".LDIE_OBJECT";
1296                         break;
1297                 case MONO_TYPE_ARRAY:
1298                         tdie = ".LDIE_OBJECT";
1299                         break;
1300                 case MONO_TYPE_VALUETYPE:
1301                         if (klass->enumtype)
1302                                 tdie = get_class_die (w, klass, FALSE);
1303                         else
1304                                 tdie = ".LDIE_I4";
1305                         break;
1306                 case MONO_TYPE_GENERICINST:
1307                         if (!MONO_TYPE_ISSTRUCT (t)) {
1308                                 tdie = g_hash_table_lookup (w->class_to_reference_die, klass);
1309                         } else {
1310                                 tdie = ".LDIE_I4";
1311                         }
1312                         break;
1313                 case MONO_TYPE_PTR:
1314                         tdie = ".LDIE_I";
1315                         break;
1316                 default:
1317                         tdie = ".LDIE_I4";
1318                         break;
1319                 }
1320         }
1321
1322         g_assert (tdie);
1323
1324         return tdie;
1325 }
1326
1327 static void
1328 emit_type (MonoDwarfWriter *w, MonoType *t)
1329 {
1330         MonoClass *klass = mono_class_from_mono_type (t);
1331         int j;
1332         const char *tdie;
1333
1334         if (t->byref) {
1335                 if (t->type == MONO_TYPE_VALUETYPE) {
1336                         tdie = emit_class_dwarf_info (w, klass, TRUE);
1337                         if (tdie)
1338                                 return;
1339                 }
1340                 else {
1341                         emit_class_dwarf_info (w, klass, FALSE);
1342                 }
1343                 // FIXME:
1344                 t = &mono_defaults.int_class->byval_arg;
1345         }
1346         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1347                 if (basic_types [j].type == t->type)
1348                         break;
1349         if (j < G_N_ELEMENTS (basic_types)) {
1350                 /* Emit a boxed version of base types */
1351                 if (j < 64 && !base_types_emitted [j]) {
1352                         emit_class_dwarf_info (w, klass, FALSE);
1353                         base_types_emitted [j] = TRUE;
1354                 }
1355         } else {
1356                 switch (t->type) {
1357                 case MONO_TYPE_CLASS:
1358                         emit_class_dwarf_info (w, klass, FALSE);
1359                         break;
1360                 case MONO_TYPE_ARRAY:
1361                         break;
1362                 case MONO_TYPE_VALUETYPE:
1363                         if (klass->enumtype)
1364                                 emit_class_dwarf_info (w, klass, FALSE);
1365                         break;
1366                 case MONO_TYPE_GENERICINST:
1367                         if (!MONO_TYPE_ISSTRUCT (t))
1368                                 emit_class_dwarf_info (w, klass, FALSE);
1369                         break;
1370                 case MONO_TYPE_PTR:
1371                         break;
1372                 default:
1373                         break;
1374                 }
1375         }
1376 }
1377
1378 static void
1379 emit_var_type (MonoDwarfWriter *w, MonoType *t)
1380 {
1381         const char *tdie;
1382
1383         tdie = get_type_die (w, t);
1384
1385         emit_symbol_diff (w, tdie, ".Ldebug_info_start", 0);
1386 }
1387
1388 static void
1389 encode_var_location (MonoDwarfWriter *w, MonoInst *ins, guint8 *p, guint8 **endp)
1390 {
1391         /* location */
1392         /* FIXME: This needs a location list, since the args can go from reg->stack */
1393         if (!ins || ins->flags & MONO_INST_IS_DEAD) {
1394                 /* gdb treats this as optimized out */
1395         } else if (ins->opcode == OP_REGVAR) {
1396                 *p = DW_OP_reg0 + mono_hw_reg_to_dwarf_reg (ins->dreg);
1397                 p ++;
1398         } else if (ins->opcode == OP_REGOFFSET) {
1399                 *p ++= DW_OP_breg0 + mono_hw_reg_to_dwarf_reg (ins->inst_basereg);
1400                 encode_sleb128 (ins->inst_offset, p, &p);
1401         } else {
1402                 // FIXME:
1403                 *p ++ = DW_OP_reg0;
1404         }
1405
1406         *endp = p;
1407 }
1408
1409 static void
1410 emit_loclist (MonoDwarfWriter *w, MonoInst *ins,
1411                           guint8 *loclist_begin_addr, guint8 *loclist_end_addr,
1412                           guint8 *expr, guint32 expr_len)
1413 {
1414         char label [128];
1415
1416         emit_push_section (w, ".debug_loc", 0);
1417         sprintf (label, ".Lloclist_%d", w->loclist_index ++ );
1418         emit_label (w, label);
1419
1420         emit_pointer_value (w, loclist_begin_addr);
1421         emit_pointer_value (w, loclist_end_addr);
1422         emit_byte (w, expr_len % 256);
1423         emit_byte (w, expr_len / 256);
1424         emit_bytes (w, expr, expr_len);
1425
1426         emit_pointer_value (w, NULL);
1427         emit_pointer_value (w, NULL);
1428
1429         emit_pop_section (w);
1430         emit_symbol_diff (w, label, ".Ldebug_loc_start", 0);
1431 }
1432
1433 /*
1434  * MonoDisHelper->tokener doesn't take an IP argument, and we can't add one since
1435  * it is a public header.
1436  */
1437 static const guint8 *token_handler_ip;
1438
1439 static char*
1440 token_handler (MonoDisHelper *dh, MonoMethod *method, guint32 token)
1441 {
1442         char *res, *desc;
1443         MonoMethod *cmethod;
1444         MonoClass *klass;
1445         MonoClassField *field;
1446         gpointer data = NULL;
1447
1448         if (method->wrapper_type)
1449                 data = mono_method_get_wrapper_data (method, token);
1450
1451         switch (*token_handler_ip) {
1452         case CEE_ISINST:
1453         case CEE_CASTCLASS:
1454         case CEE_LDELEMA:
1455                 if (method->wrapper_type)
1456                         klass = data;
1457                 else
1458                         klass = mono_class_get_full (method->klass->image, token, NULL);
1459                 res = g_strdup_printf ("<%s>", klass->name);
1460                 break;
1461         case CEE_NEWOBJ:
1462         case CEE_CALL:
1463         case CEE_CALLVIRT:
1464                 if (method->wrapper_type)
1465                         cmethod = data;
1466                 else
1467                         cmethod = mono_get_method_full (method->klass->image, token, NULL, NULL);
1468                 desc = mono_method_full_name (cmethod, TRUE);
1469                 res = g_strdup_printf ("<%s>", desc);
1470                 g_free (desc);
1471                 break;
1472         case CEE_CALLI:
1473                 if (method->wrapper_type) {
1474                         desc = mono_signature_get_desc (data, FALSE);
1475                         res = g_strdup_printf ("<%s>", desc);
1476                         g_free (desc);
1477                 } else {
1478                         res = g_strdup_printf ("<0x%08x>", token);
1479                 }
1480                 break;
1481         case CEE_LDFLD:
1482         case CEE_LDSFLD:
1483         case CEE_STFLD:
1484         case CEE_STSFLD:
1485                 if (method->wrapper_type)
1486                         field = data;
1487                 else
1488                         field = mono_field_from_token (method->klass->image, token, &klass, NULL);
1489                 desc = mono_field_full_name (field);
1490                 res = g_strdup_printf ("<%s>", desc);
1491                 g_free (desc);
1492                 break;
1493         default:
1494                 res = g_strdup_printf ("<0x%08x>", token);
1495                 break;
1496         }
1497
1498         return res;
1499 }
1500
1501 /*
1502  * disasm_ins:
1503  *
1504  *   Produce a disassembled form of the IL instruction at IP. This is an extension
1505  * of mono_disasm_code_one () which can disasm tokens, handle wrapper methods, and
1506  * CEE_MONO_ opcodes.
1507  */
1508 static char*
1509 disasm_ins (MonoMethod *method, const guchar *ip, const guint8 **endip)
1510 {
1511         char *dis;
1512         MonoDisHelper dh;
1513         MonoMethodHeader *header = mono_method_get_header (method);
1514
1515         memset (&dh, 0, sizeof (dh));
1516         dh.newline = "";
1517         dh.label_format = "IL_%04x: ";
1518         dh.label_target = "IL_%04x";
1519         dh.tokener = token_handler;
1520
1521         token_handler_ip = ip;
1522         if (*ip == MONO_CUSTOM_PREFIX) {
1523                 guint32 token;
1524                 gpointer data;
1525
1526                 switch (ip [1]) {
1527                 case CEE_MONO_ICALL: {
1528                         MonoJitICallInfo *info;
1529
1530                         token = read32 (ip + 2);
1531                         data = mono_method_get_wrapper_data (method, token);
1532                         info = mono_find_jit_icall_by_addr (data);
1533                         g_assert (info);
1534
1535                         dis = g_strdup_printf ("IL_%04x: mono_icall <%s>", (int)(ip - header->code), info->name);
1536                         ip += 6;
1537                         break;
1538                 }
1539                 case CEE_MONO_CLASSCONST: {
1540                         token = read32 (ip + 2);
1541                         data = mono_method_get_wrapper_data (method, token);
1542
1543                         dis = g_strdup_printf ("IL_%04x: mono_classconst <%s>", (int)(ip - header->code), ((MonoClass*)data)->name);
1544                         ip += 6;
1545                         break;
1546                 }
1547                 default:
1548                         dis = mono_disasm_code_one (&dh, method, ip, &ip);
1549                 }
1550         } else {
1551                 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1552         }
1553         token_handler_ip = NULL;
1554
1555         *endip = ip;
1556         mono_metadata_free_mh (header);
1557         return dis;
1558 }
1559
1560 static gint32
1561 il_offset_from_address (MonoMethod *method, MonoDebugMethodJitInfo *jit,
1562                                                 guint32 native_offset)
1563 {
1564         int i;
1565
1566         if (!jit->line_numbers)
1567                 return -1;
1568
1569         for (i = jit->num_line_numbers - 1; i >= 0; i--) {
1570                 MonoDebugLineNumberEntry lne = jit->line_numbers [i];
1571
1572                 if (lne.native_offset <= native_offset)
1573                         return lne.il_offset;
1574         }
1575
1576         return -1;
1577 }
1578
1579 static int max_special_addr_diff = 0;
1580
1581 static inline void
1582 emit_advance_op (MonoDwarfWriter *w, int line_diff, int addr_diff)
1583 {
1584         gint64 opcode = 0;
1585
1586         /* Use a special opcode if possible */
1587         if (line_diff - LINE_BASE >= 0 && line_diff - LINE_BASE < LINE_RANGE) {
1588                 if (max_special_addr_diff == 0)
1589                         max_special_addr_diff = (255 - OPCODE_BASE) / LINE_RANGE;
1590
1591                 if (addr_diff > max_special_addr_diff && (addr_diff < 2 * max_special_addr_diff)) {
1592                         emit_byte (w, DW_LNS_const_add_pc);
1593                         addr_diff -= max_special_addr_diff;
1594                 }
1595
1596                 opcode = (line_diff - LINE_BASE) + (LINE_RANGE * addr_diff) + OPCODE_BASE;
1597                 if (opcode > 255)
1598                         opcode = 0;
1599         }
1600
1601         if (opcode != 0) {
1602                 emit_byte (w, opcode);
1603         } else {
1604                 //printf ("large: %d %d %d\n", line_diff, addr_diff, max_special_addr_diff);
1605                 emit_byte (w, DW_LNS_advance_line);
1606                 emit_sleb128 (w, line_diff);
1607                 emit_byte (w, DW_LNS_advance_pc);
1608                 emit_sleb128 (w, addr_diff);
1609                 emit_byte (w, DW_LNS_copy);
1610         }
1611 }
1612
1613 static gint
1614 compare_lne (MonoDebugLineNumberEntry *a, MonoDebugLineNumberEntry *b)
1615 {
1616         if (a->native_offset == b->native_offset)
1617                 return a->il_offset - b->il_offset;
1618         else
1619                 return a->native_offset - b->native_offset;
1620 }
1621
1622 static void
1623 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
1624                                            char *start_symbol, char *end_symbol,
1625                                            guint8 *code, guint32 code_size,
1626                                            MonoDebugMethodJitInfo *debug_info)
1627 {
1628         guint32 prev_line = 0;
1629         guint32 prev_native_offset = 0;
1630         int i, file_index, il_offset, prev_il_offset;
1631         gboolean first = TRUE;
1632         MonoDebugSourceLocation *loc;
1633         char *prev_file_name = NULL;
1634         MonoMethodHeader *header = mono_method_get_header (method);
1635         MonoDebugMethodInfo *minfo;
1636         MonoDebugLineNumberEntry *ln_array;
1637         int *native_to_il_offset = NULL;
1638
1639         if (!w->emit_line) {
1640                 mono_metadata_free_mh (header);
1641                 return;
1642         }
1643
1644         minfo = mono_debug_lookup_method (method);
1645
1646         /* Compute the native->IL offset mapping */
1647
1648         g_assert (code_size);
1649
1650         ln_array = g_new0 (MonoDebugLineNumberEntry, debug_info->num_line_numbers);
1651         memcpy (ln_array, debug_info->line_numbers, debug_info->num_line_numbers * sizeof (MonoDebugLineNumberEntry));
1652
1653         qsort (ln_array, debug_info->num_line_numbers, sizeof (MonoDebugLineNumberEntry), (gpointer)compare_lne);
1654
1655         native_to_il_offset = g_new0 (int, code_size + 1);
1656
1657         for (i = 0; i < debug_info->num_line_numbers; ++i) {
1658                 int j;
1659                 MonoDebugLineNumberEntry *lne = &ln_array [i];
1660
1661                 if (i == 0) {
1662                         for (j = 0; j < lne->native_offset; ++j)
1663                                 native_to_il_offset [j] = -1;
1664                 }
1665
1666                 if (i < debug_info->num_line_numbers - 1) {
1667                         MonoDebugLineNumberEntry *lne_next = &ln_array [i + 1];
1668
1669                         for (j = lne->native_offset; j < lne_next->native_offset; ++j)
1670                                 native_to_il_offset [j] = lne->il_offset;
1671                 } else {
1672                         for (j = lne->native_offset; j < code_size; ++j)
1673                                 native_to_il_offset [j] = lne->il_offset;
1674                 }
1675         }
1676         g_free (ln_array);
1677
1678         prev_line = 1;
1679         prev_il_offset = -1;
1680
1681         for (i = 0; i < code_size; ++i) {
1682                 int line_diff, addr_diff;
1683
1684                 if (!minfo)
1685                         continue;
1686
1687                 if (!debug_info->line_numbers)
1688                         continue;
1689
1690                 if (native_to_il_offset)
1691                         il_offset = native_to_il_offset [i];
1692                 else
1693                         il_offset = il_offset_from_address (method, debug_info, i);
1694                 /*
1695                 il_offset = il_offset_from_address (method, debug_info, i);
1696
1697                 g_assert (il_offset == native_to_il_offset [i]);
1698                 */
1699
1700                 il_offset = native_to_il_offset [i];
1701                 if (il_offset < 0)
1702                         continue;
1703
1704                 if (il_offset == prev_il_offset)
1705                         continue;
1706
1707                 prev_il_offset = il_offset;
1708
1709                 loc = mono_debug_symfile_lookup_location (minfo, il_offset);
1710                 if (!(loc && loc->source_file))
1711                         continue;
1712
1713                 line_diff = (gint32)loc->row - (gint32)prev_line;
1714                 addr_diff = i - prev_native_offset;
1715
1716                 if (first) {
1717                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1718
1719                         emit_byte (w, 0);
1720                         emit_byte (w, sizeof (gpointer) + 1);
1721                         emit_byte (w, DW_LNE_set_address);
1722                         if (start_symbol)
1723                                 emit_pointer_unaligned (w, start_symbol);
1724                         else
1725                                 emit_pointer_value (w, code);
1726
1727                         /*
1728                          * The prolog+initlocals region does not have a line number, this
1729                          * makes them belong to the first line of the method.
1730                          */
1731                         emit_byte (w, DW_LNS_advance_line);
1732                         //printf ("FIRST: %d %d %d\n", prev_line, loc->row, il_offset);
1733                         emit_sleb128 (w, (gint32)loc->row - (gint32)prev_line);
1734                         prev_line = loc->row;
1735                         prev_native_offset = i;
1736                         first = FALSE;
1737                 }
1738
1739                 if (loc->row != prev_line) {
1740                         if (!prev_file_name || strcmp (loc->source_file, prev_file_name) != 0) {
1741                                 /* Add an entry to the file table */
1742                                 /* FIXME: Avoid duplicates */
1743                                 if (w->collect_line_info)
1744                                         file_index = get_line_number_file_name (w, loc->source_file) + 1;
1745                                 else
1746                                         file_index = emit_line_number_file_name (w, loc->source_file, 0, 0);
1747                                 g_free (prev_file_name);
1748                                 prev_file_name = g_strdup (loc->source_file);
1749
1750                                 if (w->cur_file_index != file_index) {
1751                                         emit_byte (w, DW_LNS_set_file);
1752                                         emit_uleb128 (w, file_index);
1753                                         emit_byte (w, DW_LNS_copy);
1754                                         w->cur_file_index = file_index;
1755                                 }
1756                         }
1757                         //printf ("X: %p(+0x%x) %d %s:%d(+%d)\n", code + i, addr_diff, loc->il_offset, loc->source_file, loc->row, line_diff);
1758                         emit_advance_op (w, line_diff, addr_diff);
1759
1760                         prev_line = loc->row;
1761                         prev_native_offset = i;
1762                 }
1763
1764                 mono_debug_symfile_free_location (loc);
1765         }
1766
1767         g_free (native_to_il_offset);
1768         g_free (prev_file_name);
1769
1770         if (!first) {
1771                 emit_byte (w, DW_LNS_advance_pc);
1772                 emit_sleb128 (w, code_size - prev_native_offset);
1773                 emit_byte (w, DW_LNS_copy);
1774
1775                 emit_byte (w, 0);
1776                 emit_byte (w, 1);
1777                 emit_byte (w, DW_LNE_end_sequence);
1778         } else if (!start_symbol) {
1779                 /* No debug info, XDEBUG mode */
1780                 char *name, *dis;
1781                 const guint8 *ip = header->code;
1782                 int prev_line, prev_native_offset;
1783                 int *il_to_line;
1784
1785                 /*
1786                  * Emit the IL code into a temporary file and emit line number info
1787                  * referencing that file.
1788                  */
1789
1790                 name = mono_method_full_name (method, TRUE);
1791                 fprintf (w->il_file, "// %s\n", name);
1792                 w->il_file_line_index ++;
1793                 g_free (name);
1794
1795                 il_to_line = g_new0 (int, header->code_size);
1796
1797                 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1798                 emit_byte (w, 0);
1799                 emit_byte (w, sizeof (gpointer) + 1);
1800                 emit_byte (w, DW_LNE_set_address);
1801                 emit_pointer_value (w, code);
1802
1803                 // FIXME: Optimize this
1804                 while (ip < header->code + header->code_size) {
1805                         int il_offset = ip - header->code;
1806
1807                         /* Emit IL */
1808                         w->il_file_line_index ++;
1809
1810                         dis = disasm_ins (method, ip, &ip);
1811                         fprintf (w->il_file, "%s\n", dis);
1812                         g_free (dis);
1813
1814                         il_to_line [il_offset] = w->il_file_line_index;
1815                 }
1816
1817                 /* Emit line number info */
1818                 prev_line = 1;
1819                 prev_native_offset = 0;
1820                 for (i = 0; i < debug_info->num_line_numbers; ++i) {
1821                         MonoDebugLineNumberEntry *lne = &debug_info->line_numbers [i];
1822                         int line;
1823
1824                         if (lne->il_offset >= header->code_size)
1825                                 continue;
1826                         line = il_to_line [lne->il_offset];
1827                         if (!line) {
1828                                 /*
1829                                  * This seems to happen randomly, it looks like il_offset points
1830                                  * into the middle of an instruction.
1831                                  */
1832                                 continue;
1833                                 /*
1834                                 printf ("%s\n", mono_method_full_name (method, TRUE));
1835                                 printf ("%d %d\n", lne->il_offset, header->code_size);
1836                                 g_assert (line);
1837                                 */
1838                         }
1839
1840                         if (line - prev_line != 0) {
1841                                 emit_advance_op (w, line - prev_line, (gint32)lne->native_offset - prev_native_offset);
1842
1843                                 prev_line = line;
1844                                 prev_native_offset = lne->native_offset;
1845                         }
1846                 }
1847
1848                 emit_byte (w, DW_LNS_advance_pc);
1849                 emit_sleb128 (w, code_size - prev_native_offset);
1850                 emit_byte (w, DW_LNS_copy);
1851
1852                 emit_byte (w, 0);
1853                 emit_byte (w, 1);
1854                 emit_byte (w, DW_LNE_end_sequence);
1855
1856                 fflush (w->il_file);
1857                 g_free (il_to_line);
1858         }
1859         mono_metadata_free_mh (header);
1860 }
1861
1862 static MonoMethodVar*
1863 find_vmv (MonoCompile *cfg, MonoInst *ins)
1864 {
1865         int j;
1866
1867         if (cfg->varinfo) {
1868                 for (j = 0; j < cfg->num_varinfo; ++j) {
1869                         if (cfg->varinfo [j] == ins)
1870                                 break;
1871                 }
1872
1873                 if (j < cfg->num_varinfo) {
1874                         return MONO_VARINFO (cfg, j);
1875                 }
1876         }
1877
1878         return NULL;
1879 }
1880
1881 void
1882 mono_dwarf_writer_emit_method (MonoDwarfWriter *w, MonoCompile *cfg, MonoMethod *method, char *start_symbol, char *end_symbol, guint8 *code, guint32 code_size, MonoInst **args, MonoInst **locals, GSList *unwind_info, MonoDebugMethodJitInfo *debug_info)
1883 {
1884         char *name;
1885         MonoMethodSignature *sig;
1886         MonoMethodHeader *header;
1887         char **names;
1888         MonoDebugLocalsInfo *locals_info;
1889         int i;
1890         guint8 buf [128];
1891         guint8 *p;
1892
1893         emit_section_change (w, ".debug_info", 0);
1894
1895         sig = mono_method_signature (method);
1896         header = mono_method_get_header (method);
1897
1898         /* Parameter types */
1899         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1900                 MonoType *t;
1901
1902                 if (i == 0 && sig->hasthis) {
1903                         if (method->klass->valuetype)
1904                                 t = &method->klass->this_arg;
1905                         else
1906                                 t = &method->klass->byval_arg;
1907                 } else {
1908                         t = sig->params [i - sig->hasthis];
1909                 }
1910
1911                 emit_type (w, t);
1912         }
1913         //emit_type (w, &mono_defaults.int32_class->byval_arg);
1914
1915         /* Local types */
1916         for (i = 0; i < header->num_locals; ++i) {
1917                 emit_type (w, header->locals [i]);
1918         }
1919
1920         /* Subprogram */
1921         names = g_new0 (char *, sig->param_count);
1922         mono_method_get_param_names (method, (const char **) names);
1923
1924         emit_uleb128 (w, ABBREV_SUBPROGRAM);
1925         name = mono_method_full_name (method, FALSE);
1926         emit_string (w, name);
1927 #ifndef TARGET_IOS
1928         emit_string (w, name);
1929 #endif
1930         g_free (name);
1931         if (start_symbol) {
1932                 emit_pointer_unaligned (w, start_symbol);
1933                 emit_pointer_unaligned (w, end_symbol);
1934         } else {
1935                 emit_pointer_value (w, code);
1936                 emit_pointer_value (w, code + code_size);
1937         }
1938         /* frame_base */
1939         emit_byte (w, 2);
1940         emit_byte (w, DW_OP_breg6);
1941         emit_byte (w, 16);
1942
1943         /* Parameters */
1944         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1945                 MonoInst *arg = args ? args [i] : NULL;
1946                 MonoType *t;
1947                 const char *pname;
1948                 char pname_buf [128];
1949                 MonoMethodVar *vmv = NULL;
1950                 gboolean need_loclist = FALSE;
1951
1952                 vmv = find_vmv (cfg, arg);
1953                 if (code && vmv && (vmv->live_range_start || vmv->live_range_end))
1954                         need_loclist = TRUE;
1955
1956                 if (i == 0 && sig->hasthis) {
1957                         if (method->klass->valuetype)
1958                                 t = &method->klass->this_arg;
1959                         else
1960                                 t = &method->klass->byval_arg;
1961                         pname = "this";
1962                 } else {
1963                         t = sig->params [i - sig->hasthis];
1964                         pname = names [i - sig->hasthis];
1965                 }
1966
1967                 emit_uleb128 (w, need_loclist ? ABBREV_PARAM_LOCLIST : ABBREV_PARAM);
1968                 /* name */
1969                 if (pname[0] == '\0') {
1970                         sprintf (pname_buf, "param%d", i - sig->hasthis);
1971                         pname = pname_buf;
1972                 }
1973                 emit_string (w, pname);
1974                 /* type */
1975                 if (!arg || arg->flags & MONO_INST_IS_DEAD)
1976                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1977                 else
1978                         emit_var_type (w, t);
1979
1980                 p = buf;
1981                 encode_var_location (w, arg, p, &p);
1982                 if (need_loclist) {
1983                         vmv->live_range_start = 0;
1984                         if (vmv->live_range_end == 0)
1985                                 /* FIXME: Uses made in calls are not recorded */
1986                                 vmv->live_range_end = code_size;
1987                         emit_loclist (w, arg, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
1988                 } else {
1989                         emit_byte (w, p - buf);
1990                         emit_bytes (w, buf, p - buf);
1991                 }
1992         }
1993         g_free (names);
1994
1995         /* Locals */
1996         locals_info = mono_debug_lookup_locals (method);
1997
1998         for (i = 0; i < header->num_locals; ++i) {
1999                 MonoInst *ins = locals [i];
2000                 char name_buf [128];
2001                 int j;
2002                 MonoMethodVar *vmv = NULL;
2003                 gboolean need_loclist = FALSE;
2004                 char *lname;
2005
2006                 /* ins->dreg no longer contains the original vreg */
2007                 vmv = find_vmv (cfg, ins);
2008                 if (code && vmv) {
2009                         if (vmv->live_range_start) {
2010                                 /* This variable has a precise live range */
2011                                 need_loclist = TRUE;
2012                         }
2013                 }
2014
2015                 emit_uleb128 (w, need_loclist ? ABBREV_VARIABLE_LOCLIST : ABBREV_VARIABLE);
2016                 /* name */
2017                 lname = NULL;
2018                 if (locals_info) {
2019                         for (j = 0; j < locals_info->num_locals; ++j)
2020                                 if (locals_info->locals [j].index == i)
2021                                         break;
2022                         if (j < locals_info->num_locals)
2023                                 lname = locals_info->locals [j].name;
2024                 }
2025                 if (lname) {
2026                         emit_string (w, lname);
2027                 } else {
2028                         sprintf (name_buf, "V_%d", i);
2029                         emit_string (w, name_buf);
2030                 }
2031                 /* type */
2032                 if (!ins || ins->flags & MONO_INST_IS_DEAD)
2033                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
2034                 else
2035                         emit_var_type (w, header->locals [i]);
2036
2037                 p = buf;
2038                 encode_var_location (w, ins, p, &p);
2039
2040                 if (need_loclist) {
2041                         if (vmv->live_range_end == 0)
2042                                 /* FIXME: Uses made in calls are not recorded */
2043                                 vmv->live_range_end = code_size;
2044                         emit_loclist (w, ins, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
2045                 } else {
2046                         emit_byte (w, p - buf);
2047                         emit_bytes (w, buf, p - buf);
2048                 }
2049         }
2050
2051         if (locals_info)
2052                 mono_debug_symfile_free_locals (locals_info);
2053
2054         /* Subprogram end */
2055         emit_uleb128 (w, 0x0);
2056
2057         emit_line (w);
2058
2059         emit_debug_info_end (w);
2060
2061         /* Emit unwind info */
2062         if (unwind_info) {
2063                 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, TRUE);
2064                 w->fde_index ++;
2065         }
2066
2067         /* Emit line number info */
2068         /* != could happen when using --regression */
2069         if (debug_info && (debug_info->code_start == code)) {
2070                 if (w->collect_line_info) {
2071                         MethodLineNumberInfo *info;
2072
2073                         /* Save the information needed to emit the line number info later at once */
2074                         info = g_new0 (MethodLineNumberInfo, 1);
2075                         info->method = method;
2076                         info->start_symbol = g_strdup (start_symbol);
2077                         info->end_symbol = g_strdup (end_symbol);
2078                         info->code = code;
2079                         info->code_size = code_size;
2080                         w->line_info = g_slist_prepend (w->line_info, info);
2081                 } else {
2082                         emit_line_number_info (w, method, start_symbol, end_symbol, code, code_size, debug_info);
2083                 }
2084         }
2085
2086         emit_line (w);
2087         mono_metadata_free_mh (header);
2088 }
2089
2090 void
2091 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)
2092 {
2093         emit_section_change (w, ".debug_info", 0);
2094
2095         /* Subprogram */
2096         emit_uleb128 (w, ABBREV_TRAMP_SUBPROGRAM);
2097         emit_string (w, tramp_name);
2098         emit_pointer_value (w, code);
2099         emit_pointer_value (w, code + code_size);
2100
2101         /* Subprogram end */
2102         emit_uleb128 (w, 0x0);
2103
2104         emit_debug_info_end (w);
2105
2106         /* Emit unwind info */
2107         emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, FALSE);
2108         w->fde_index ++;
2109 }
2110 #endif /* End of: !defined(DISABLE_AOT) && !defined(DISABLE_JIT) */