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         if (!w->emit_line) {
 858                 emit_section_change (w, ".debug_line", 0);
 859                 emit_label (w, ".Ldebug_line_section_start");
 860                 emit_label (w, ".Ldebug_line_start");
 861         }
 862
 863         w->cie_program = base_unwind_program;
 864
 865         emit_section_change (w, ".debug_abbrev", 0);
 866         emit_dwarf_abbrev (w, ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, TRUE,
 867                                            compile_unit_attr, G_N_ELEMENTS (compile_unit_attr));
 868         emit_dwarf_abbrev (w, ABBREV_SUBPROGRAM, DW_TAG_subprogram, TRUE,
 869                                            subprogram_attr, G_N_ELEMENTS (subprogram_attr));
 870         emit_dwarf_abbrev (w, ABBREV_PARAM, DW_TAG_formal_parameter, FALSE,
 871                                            param_attr, G_N_ELEMENTS (param_attr));
 872         emit_dwarf_abbrev (w, ABBREV_PARAM_LOCLIST, DW_TAG_formal_parameter, FALSE,
 873                                            param_loclist_attr, G_N_ELEMENTS (param_loclist_attr));
 874         emit_dwarf_abbrev (w, ABBREV_BASE_TYPE, DW_TAG_base_type, FALSE,
 875                                            base_type_attr, G_N_ELEMENTS (base_type_attr));
 876         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE, DW_TAG_class_type, TRUE,
 877                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 878         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE_NOCHILDREN, DW_TAG_class_type, FALSE,
 879                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 880         emit_dwarf_abbrev (w, ABBREV_DATA_MEMBER, DW_TAG_member, FALSE,
 881                                            data_member_attr, G_N_ELEMENTS (data_member_attr));
 882         emit_dwarf_abbrev (w, ABBREV_TYPEDEF, DW_TAG_typedef, FALSE,
 883                                            typedef_attr, G_N_ELEMENTS (typedef_attr));
 884         emit_dwarf_abbrev (w, ABBREV_ENUM_TYPE, DW_TAG_enumeration_type, TRUE,
 885                                            enum_type_attr, G_N_ELEMENTS (enum_type_attr));
 886         emit_dwarf_abbrev (w, ABBREV_ENUMERATOR, DW_TAG_enumerator, FALSE,
 887                                            enumerator_attr, G_N_ELEMENTS (enumerator_attr));
 888         emit_dwarf_abbrev (w, ABBREV_NAMESPACE, DW_TAG_namespace, TRUE,
 889                                            namespace_attr, G_N_ELEMENTS (namespace_attr));
 890         emit_dwarf_abbrev (w, ABBREV_VARIABLE, DW_TAG_variable, FALSE,
 891                                            variable_attr, G_N_ELEMENTS (variable_attr));
 892         emit_dwarf_abbrev (w, ABBREV_VARIABLE_LOCLIST, DW_TAG_variable, FALSE,
 893                                            variable_loclist_attr, G_N_ELEMENTS (variable_loclist_attr));
 894         emit_dwarf_abbrev (w, ABBREV_POINTER_TYPE, DW_TAG_pointer_type, FALSE,
 895                                            pointer_type_attr, G_N_ELEMENTS (pointer_type_attr));
 896         emit_dwarf_abbrev (w, ABBREV_REFERENCE_TYPE, DW_TAG_reference_type, FALSE,
 897                                            reference_type_attr, G_N_ELEMENTS (reference_type_attr));
 898         emit_dwarf_abbrev (w, ABBREV_INHERITANCE, DW_TAG_inheritance, FALSE,
 899                                            inheritance_attr, G_N_ELEMENTS (inheritance_attr));
 900         emit_dwarf_abbrev (w, ABBREV_TRAMP_SUBPROGRAM, DW_TAG_subprogram, FALSE,
 901                                            tramp_subprogram_attr, G_N_ELEMENTS (tramp_subprogram_attr));
 902         emit_byte (w, 0);
 903
 904         emit_section_change (w, ".debug_info", 0);
 905         emit_label (w, ".Ldebug_info_start");
 906         emit_symbol_diff (w, ".Ldebug_info_end", ".Ldebug_info_begin", 0); /* length */
 907         emit_label (w, ".Ldebug_info_begin");
 908         emit_int16 (w, 0x2); /* DWARF version 2 */
 909         emit_int32 (w, 0); /* .debug_abbrev offset */
 910         emit_byte (w, sizeof (gpointer)); /* address size */
 911
 912         /* Compilation unit */
 913         emit_uleb128 (w, ABBREV_COMPILE_UNIT);
 914         build_info = mono_get_runtime_build_info ();
 915         s = g_strdup_printf ("Mono AOT Compiler %s", build_info);
 916         emit_string (w, s);
 917         g_free (build_info);
 918         g_free (s);
 919         emit_string (w, cu_name);
 920         emit_string (w, "");
 921         emit_byte (w, DW_LANG_C);
 922         emit_pointer_value (w, 0);
 923         emit_pointer_value (w, 0);
 924         /* offset into .debug_line section */
 925         emit_symbol_diff (w, ".Ldebug_line_start", ".Ldebug_line_section_start", 0);
 926
 927         /* Base types */
 928         for (i = 0; i < G_N_ELEMENTS (basic_types); ++i) {
 929                 emit_label (w, basic_types [i].die_name);
 930                 emit_uleb128 (w, ABBREV_BASE_TYPE);
 931                 emit_byte (w, basic_types [i].size);
 932                 emit_byte (w, basic_types [i].encoding);
 933                 emit_string (w, basic_types [i].name);
 934         }
 935
 936         emit_debug_info_end (w);
 937
 938         /* debug_loc section */
 939         emit_section_change (w, ".debug_loc", 0);
 940         emit_label (w, ".Ldebug_loc_start");
 941
 942         emit_cie (w);
 943 }
 944
 945 /*
 946  * mono_dwarf_writer_close:
 947  *
 948  *   Finalize the emitted debugging info.
 949  */
 950 void
 951 mono_dwarf_writer_close (MonoDwarfWriter *w)
 952 {
 953         emit_section_change (w, ".debug_info", 0);
 954         emit_byte (w, 0); /* close COMPILE_UNIT */
 955         emit_label (w, ".Ldebug_info_end");
 956
 957         if (w->emit_line)
 958                 emit_all_line_number_info (w);
 959 }
 960
 961 static void emit_type (MonoDwarfWriter *w, MonoType *t);
 962 static const char* get_type_die (MonoDwarfWriter *w, MonoType *t);
 963
 964 static const char*
 965 get_class_die (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
 966 {
 967         GHashTable *cache;
 968
 969         if (vtype)
 970                 cache = w->class_to_vtype_die;
 971         else
 972                 cache = w->class_to_die;
 973
 974         return (const char *)g_hash_table_lookup (cache, klass);
 975 }
 976
 977 /* Returns the local symbol pointing to the emitted debug info */
 978 static char*
 979 emit_class_dwarf_info (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
 980 {
 981         char *die, *pointer_die, *reference_die;
 982         char *full_name, *p;
 983         gpointer iter;
 984         MonoClassField *field;
 985         const char *fdie;
 986         int k;
 987         gboolean emit_namespace = FALSE, has_children;
 988         GHashTable *cache;
 989
 990         if (vtype)
 991                 cache = w->class_to_vtype_die;
 992         else
 993                 cache = w->class_to_die;
 994
 995         die = (char *)g_hash_table_lookup (cache, klass);
 996         if (die)
 997                 return die;
 998
 999         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) ||
1000                   (klass->byval_arg.type >= MONO_TYPE_BOOLEAN && klass->byval_arg.type <= MONO_TYPE_R8 && !vtype)))
1001                 return NULL;
1002
1003         /*
1004          * FIXME: gdb can't handle namespaces in languages it doesn't know about.
1005          */
1006         /*
1007         if (klass->name_space && klass->name_space [0] != '\0')
1008                 emit_namespace = TRUE;
1009         */
1010         if (emit_namespace) {
1011                 emit_uleb128 (w, ABBREV_NAMESPACE);
1012                 emit_string (w, klass->name_space);
1013         }
1014
1015         full_name = g_strdup_printf ("%s%s%s", klass->name_space, klass->name_space ? "." : "", klass->name);
1016         /*
1017          * gdb doesn't support namespaces for non-C++ dwarf objects, so use _
1018          * to separate components.
1019          */
1020         for (p = full_name; *p; p ++)
1021                 if (*p == '.')
1022                         *p = '_';
1023
1024         die = g_strdup_printf (".LTDIE_%d", w->tdie_index);
1025         pointer_die = g_strdup_printf (".LTDIE_%d_POINTER", w->tdie_index);
1026         reference_die = g_strdup_printf (".LTDIE_%d_REFERENCE", w->tdie_index);
1027         w->tdie_index ++;
1028
1029         g_hash_table_insert (w->class_to_pointer_die, klass, pointer_die);
1030         g_hash_table_insert (w->class_to_reference_die, klass, reference_die);
1031         g_hash_table_insert (cache, klass, die);
1032
1033         if (klass->enumtype) {
1034                 int size = mono_class_value_size (mono_class_from_mono_type (mono_class_enum_basetype (klass)), NULL);
1035
1036                 emit_label (w, die);
1037
1038                 emit_uleb128 (w, ABBREV_ENUM_TYPE);
1039                 emit_string (w, full_name);
1040                 emit_uleb128 (w, size);
1041                 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
1042                         if (basic_types [k].type == mono_class_enum_basetype (klass)->type)
1043                                 break;
1044                 g_assert (k < G_N_ELEMENTS (basic_types));
1045                 emit_symbol_diff (w, basic_types [k].die_name, ".Ldebug_info_start", 0);
1046
1047                 /* Emit enum values */
1048                 iter = NULL;
1049                 while ((field = mono_class_get_fields (klass, &iter))) {
1050                         const char *p;
1051                         MonoTypeEnum def_type;
1052
1053                         if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC))
1054                                 continue;
1055                         if (mono_field_is_deleted (field))
1056                                 continue;
1057
1058                         emit_uleb128 (w, ABBREV_ENUMERATOR);
1059                         emit_string (w, mono_field_get_name (field));
1060
1061                         p = mono_class_get_field_default_value (field, &def_type);
1062                         /* len = */ mono_metadata_decode_blob_size (p, &p);
1063                         switch (mono_class_enum_basetype (klass)->type) {
1064                         case MONO_TYPE_U1:
1065                         case MONO_TYPE_I1:
1066                         case MONO_TYPE_BOOLEAN:
1067                                 emit_sleb128 (w, *p);
1068                                 break;
1069                         case MONO_TYPE_U2:
1070                         case MONO_TYPE_I2:
1071                         case MONO_TYPE_CHAR:
1072                                 emit_sleb128 (w, read16 (p));
1073                                 break;
1074                         case MONO_TYPE_U4:
1075                         case MONO_TYPE_I4:
1076                                 emit_sleb128 (w, read32 (p));
1077                                 break;
1078                         case MONO_TYPE_U8:
1079                         case MONO_TYPE_I8:
1080                                 emit_sleb128 (w, read64 (p));
1081                                 break;
1082                         case MONO_TYPE_I:
1083                         case MONO_TYPE_U:
1084 #if SIZEOF_VOID_P == 8
1085                                 emit_sleb128 (w, read64 (p));
1086 #else
1087                                 emit_sleb128 (w, read32 (p));
1088 #endif
1089                                 break;
1090                         default:
1091                                 g_assert_not_reached ();
1092                         }
1093                 }
1094
1095                 has_children = TRUE;
1096         } else {
1097                 guint8 buf [128];
1098                 guint8 *p;
1099                 char *parent_die;
1100
1101                 if (klass->parent)
1102                         parent_die = emit_class_dwarf_info (w, klass->parent, FALSE);
1103                 else
1104                         parent_die = NULL;
1105
1106                 /* Emit field types */
1107                 iter = NULL;
1108                 while ((field = mono_class_get_fields (klass, &iter))) {
1109                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1110                                 continue;
1111
1112                         emit_type (w, field->type);
1113                 }
1114
1115                 iter = NULL;
1116                 has_children = parent_die || mono_class_get_fields (klass, &iter);
1117
1118                 emit_label (w, die);
1119
1120                 emit_uleb128 (w, has_children ? ABBREV_STRUCT_TYPE : ABBREV_STRUCT_TYPE_NOCHILDREN);
1121                 emit_string (w, full_name);
1122                 emit_uleb128 (w, klass->instance_size);
1123
1124                 if (parent_die) {
1125                         emit_uleb128 (w, ABBREV_INHERITANCE);
1126                         emit_symbol_diff (w, parent_die, ".Ldebug_info_start", 0);
1127
1128                         p = buf;
1129                         *p ++= DW_OP_plus_uconst;
1130                         encode_uleb128 (0, p, &p);
1131                         emit_byte (w, p - buf);
1132                         emit_bytes (w, buf, p - buf);
1133                 }
1134
1135                 /* Emit fields */
1136                 iter = NULL;
1137                 while ((field = mono_class_get_fields (klass, &iter))) {
1138                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1139                                 continue;
1140
1141                         fdie = get_type_die (w, field->type);
1142                         if (fdie) {
1143                                 emit_uleb128 (w, ABBREV_DATA_MEMBER);
1144                                 emit_string (w, field->name);
1145                                 emit_symbol_diff (w, fdie, ".Ldebug_info_start", 0);
1146                                 /* location */
1147                                 p = buf;
1148                                 *p ++= DW_OP_plus_uconst;
1149                                 if (klass->valuetype && vtype)
1150                                         encode_uleb128 (field->offset - sizeof (MonoObject), p, &p);
1151                                 else
1152                                         encode_uleb128 (field->offset, p, &p);
1153
1154                                 emit_byte (w, p - buf);
1155                                 emit_bytes (w, buf, p - buf);
1156                         }
1157                 }
1158         }
1159
1160         /* Type end */
1161         if (has_children)
1162                 emit_uleb128 (w, 0x0);
1163
1164         /* Add a typedef, so we can reference the type without a 'struct' in gdb */
1165         emit_uleb128 (w, ABBREV_TYPEDEF);
1166         emit_string (w, full_name);
1167         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1168
1169         /* Add a pointer type */
1170         emit_label (w, pointer_die);
1171
1172         emit_uleb128 (w, ABBREV_POINTER_TYPE);
1173         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1174
1175         /* Add a reference type */
1176         emit_label (w, reference_die);
1177
1178         emit_uleb128 (w, ABBREV_REFERENCE_TYPE);
1179         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1180
1181         g_free (full_name);
1182
1183         if (emit_namespace) {
1184                 /* Namespace end */
1185                 emit_uleb128 (w, 0x0);
1186         }
1187
1188         return die;
1189 }
1190
1191 static gboolean base_types_emitted [64];
1192
1193 static const char*
1194 get_type_die (MonoDwarfWriter *w, MonoType *t)
1195 {
1196         MonoClass *klass = mono_class_from_mono_type (t);
1197         int j;
1198         const char *tdie;
1199
1200         if (t->byref) {
1201                 if (t->type == MONO_TYPE_VALUETYPE) {
1202                         tdie = (const char *)g_hash_table_lookup (w->class_to_pointer_die, klass);
1203                 }
1204                 else {
1205                         tdie = get_class_die (w, klass, FALSE);
1206                         /* Should return a pointer type to a reference */
1207                 }
1208                 // FIXME:
1209                 t = &mono_defaults.int_class->byval_arg;
1210         }
1211         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1212                 if (basic_types [j].type == t->type)
1213                         break;
1214         if (j < G_N_ELEMENTS (basic_types)) {
1215                 tdie = basic_types [j].die_name;
1216         } else {
1217                 switch (t->type) {
1218                 case MONO_TYPE_CLASS:
1219                         tdie = (const char *)g_hash_table_lookup (w->class_to_reference_die, klass);
1220                         //tdie = ".LDIE_OBJECT";
1221                         break;
1222                 case MONO_TYPE_ARRAY:
1223                         tdie = ".LDIE_OBJECT";
1224                         break;
1225                 case MONO_TYPE_VALUETYPE:
1226                         if (klass->enumtype)
1227                                 tdie = get_class_die (w, klass, FALSE);
1228                         else
1229                                 tdie = ".LDIE_I4";
1230                         break;
1231                 case MONO_TYPE_GENERICINST:
1232                         if (!MONO_TYPE_ISSTRUCT (t)) {
1233                                 tdie = (const char *)g_hash_table_lookup (w->class_to_reference_die, klass);
1234                         } else {
1235                                 tdie = ".LDIE_I4";
1236                         }
1237                         break;
1238                 case MONO_TYPE_PTR:
1239                         tdie = ".LDIE_I";
1240                         break;
1241                 default:
1242                         tdie = ".LDIE_I4";
1243                         break;
1244                 }
1245         }
1246
1247         g_assert (tdie);
1248
1249         return tdie;
1250 }
1251
1252 static void
1253 emit_type (MonoDwarfWriter *w, MonoType *t)
1254 {
1255         MonoClass *klass = mono_class_from_mono_type (t);
1256         int j;
1257         const char *tdie;
1258
1259         if (t->byref) {
1260                 if (t->type == MONO_TYPE_VALUETYPE) {
1261                         tdie = emit_class_dwarf_info (w, klass, TRUE);
1262                         if (tdie)
1263                                 return;
1264                 }
1265                 else {
1266                         emit_class_dwarf_info (w, klass, FALSE);
1267                 }
1268                 // FIXME:
1269                 t = &mono_defaults.int_class->byval_arg;
1270         }
1271         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1272                 if (basic_types [j].type == t->type)
1273                         break;
1274         if (j < G_N_ELEMENTS (basic_types)) {
1275                 /* Emit a boxed version of base types */
1276                 if (j < 64 && !base_types_emitted [j]) {
1277                         emit_class_dwarf_info (w, klass, FALSE);
1278                         base_types_emitted [j] = TRUE;
1279                 }
1280         } else {
1281                 switch (t->type) {
1282                 case MONO_TYPE_CLASS:
1283                         emit_class_dwarf_info (w, klass, FALSE);
1284                         break;
1285                 case MONO_TYPE_ARRAY:
1286                         break;
1287                 case MONO_TYPE_VALUETYPE:
1288                         if (klass->enumtype)
1289                                 emit_class_dwarf_info (w, klass, FALSE);
1290                         break;
1291                 case MONO_TYPE_GENERICINST:
1292                         if (!MONO_TYPE_ISSTRUCT (t))
1293                                 emit_class_dwarf_info (w, klass, FALSE);
1294                         break;
1295                 case MONO_TYPE_PTR:
1296                         break;
1297                 default:
1298                         break;
1299                 }
1300         }
1301 }
1302
1303 static void
1304 emit_var_type (MonoDwarfWriter *w, MonoType *t)
1305 {
1306         const char *tdie;
1307
1308         tdie = get_type_die (w, t);
1309
1310         emit_symbol_diff (w, tdie, ".Ldebug_info_start", 0);
1311 }
1312
1313 static void
1314 encode_var_location (MonoDwarfWriter *w, MonoInst *ins, guint8 *p, guint8 **endp)
1315 {
1316         /* location */
1317         /* FIXME: This needs a location list, since the args can go from reg->stack */
1318         if (!ins || ins->flags & MONO_INST_IS_DEAD) {
1319                 /* gdb treats this as optimized out */
1320         } else if (ins->opcode == OP_REGVAR) {
1321                 *p = DW_OP_reg0 + mono_hw_reg_to_dwarf_reg (ins->dreg);
1322                 p ++;
1323         } else if (ins->opcode == OP_REGOFFSET) {
1324                 *p ++= DW_OP_breg0 + mono_hw_reg_to_dwarf_reg (ins->inst_basereg);
1325                 encode_sleb128 (ins->inst_offset, p, &p);
1326         } else {
1327                 // FIXME:
1328                 *p ++ = DW_OP_reg0;
1329         }
1330
1331         *endp = p;
1332 }
1333
1334 static void
1335 emit_loclist (MonoDwarfWriter *w, MonoInst *ins,
1336                           guint8 *loclist_begin_addr, guint8 *loclist_end_addr,
1337                           guint8 *expr, guint32 expr_len)
1338 {
1339         char label [128];
1340
1341         emit_push_section (w, ".debug_loc", 0);
1342         sprintf (label, ".Lloclist_%d", w->loclist_index ++ );
1343         emit_label (w, label);
1344
1345         emit_pointer_value (w, loclist_begin_addr);
1346         emit_pointer_value (w, loclist_end_addr);
1347         emit_byte (w, expr_len % 256);
1348         emit_byte (w, expr_len / 256);
1349         emit_bytes (w, expr, expr_len);
1350
1351         emit_pointer_value (w, NULL);
1352         emit_pointer_value (w, NULL);
1353
1354         emit_pop_section (w);
1355         emit_symbol_diff (w, label, ".Ldebug_loc_start", 0);
1356 }
1357
1358 /*
1359  * MonoDisHelper->tokener doesn't take an IP argument, and we can't add one since
1360  * it is a public header.
1361  */
1362 static const guint8 *token_handler_ip;
1363
1364 static char*
1365 token_handler (MonoDisHelper *dh, MonoMethod *method, guint32 token)
1366 {
1367         MonoError error;
1368         char *res, *desc;
1369         MonoMethod *cmethod;
1370         MonoClass *klass;
1371         MonoClassField *field;
1372         gpointer data = NULL;
1373
1374         if (method->wrapper_type)
1375                 data = mono_method_get_wrapper_data (method, token);
1376
1377         switch (*token_handler_ip) {
1378         case CEE_ISINST:
1379         case CEE_CASTCLASS:
1380         case CEE_LDELEMA:
1381                 if (method->wrapper_type) {
1382                         klass = (MonoClass *)data;
1383                 } else {
1384                         klass = mono_class_get_checked (method->klass->image, token, &error);
1385                         g_assert (mono_error_ok (&error)); /* FIXME error handling */
1386                 }
1387                 res = g_strdup_printf ("<%s>", klass->name);
1388                 break;
1389         case CEE_NEWOBJ:
1390         case CEE_CALL:
1391         case CEE_CALLVIRT:
1392                 if (method->wrapper_type) {
1393                         cmethod = (MonoMethod *)data;
1394                 } else {
1395                         MonoError error;
1396                         cmethod = mono_get_method_checked (method->klass->image, token, NULL, NULL, &error);
1397                         if (!cmethod)
1398                                 g_error ("Could not load method due to %s", mono_error_get_message (&error)); /* FIXME don't swallow the error */
1399                 }
1400                 desc = mono_method_full_name (cmethod, TRUE);
1401                 res = g_strdup_printf ("<%s>", desc);
1402                 g_free (desc);
1403                 break;
1404         case CEE_CALLI:
1405                 if (method->wrapper_type) {
1406                         desc = mono_signature_get_desc ((MonoMethodSignature *)data, FALSE);
1407                         res = g_strdup_printf ("<%s>", desc);
1408                         g_free (desc);
1409                 } else {
1410                         res = g_strdup_printf ("<0x%08x>", token);
1411                 }
1412                 break;
1413         case CEE_LDFLD:
1414         case CEE_LDSFLD:
1415         case CEE_STFLD:
1416         case CEE_STSFLD:
1417                 if (method->wrapper_type) {
1418                         field = (MonoClassField *)data;
1419                 } else {
1420                         field = mono_field_from_token_checked (method->klass->image, token, &klass, NULL,  &error);
1421                         g_assert (mono_error_ok (&error)); /* FIXME error handling */
1422                 }
1423                 desc = mono_field_full_name (field);
1424                 res = g_strdup_printf ("<%s>", desc);
1425                 g_free (desc);
1426                 break;
1427         default:
1428                 res = g_strdup_printf ("<0x%08x>", token);
1429                 break;
1430         }
1431
1432         return res;
1433 }
1434
1435 /*
1436  * disasm_ins:
1437  *
1438  *   Produce a disassembled form of the IL instruction at IP. This is an extension
1439  * of mono_disasm_code_one () which can disasm tokens, handle wrapper methods, and
1440  * CEE_MONO_ opcodes.
1441  */
1442 static char*
1443 disasm_ins (MonoMethod *method, const guchar *ip, const guint8 **endip)
1444 {
1445         MonoError error;
1446         char *dis;
1447         MonoDisHelper dh;
1448         MonoMethodHeader *header = mono_method_get_header_checked (method, &error);
1449         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1450
1451         memset (&dh, 0, sizeof (dh));
1452         dh.newline = "";
1453         dh.label_format = "IL_%04x: ";
1454         dh.label_target = "IL_%04x";
1455         dh.tokener = token_handler;
1456
1457         token_handler_ip = ip;
1458         if (*ip == MONO_CUSTOM_PREFIX) {
1459                 guint32 token;
1460                 gpointer data;
1461
1462                 switch (ip [1]) {
1463                 case CEE_MONO_ICALL: {
1464                         MonoJitICallInfo *info;
1465
1466                         token = read32 (ip + 2);
1467                         data = mono_method_get_wrapper_data (method, token);
1468                         info = mono_find_jit_icall_by_addr (data);
1469                         g_assert (info);
1470
1471                         dis = g_strdup_printf ("IL_%04x: mono_icall <%s>", (int)(ip - header->code), info->name);
1472                         ip += 6;
1473                         break;
1474                 }
1475                 case CEE_MONO_CLASSCONST: {
1476                         token = read32 (ip + 2);
1477                         data = mono_method_get_wrapper_data (method, token);
1478
1479                         dis = g_strdup_printf ("IL_%04x: mono_classconst <%s>", (int)(ip - header->code), ((MonoClass*)data)->name);
1480                         ip += 6;
1481                         break;
1482                 }
1483                 default:
1484                         dis = mono_disasm_code_one (&dh, method, ip, &ip);
1485                 }
1486         } else {
1487                 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1488         }
1489         token_handler_ip = NULL;
1490
1491         *endip = ip;
1492         mono_metadata_free_mh (header);
1493         return dis;
1494 }
1495
1496 static gint32
1497 il_offset_from_address (MonoMethod *method, MonoDebugMethodJitInfo *jit,
1498                                                 guint32 native_offset)
1499 {
1500         int i;
1501
1502         if (!jit->line_numbers)
1503                 return -1;
1504
1505         for (i = jit->num_line_numbers - 1; i >= 0; i--) {
1506                 MonoDebugLineNumberEntry lne = jit->line_numbers [i];
1507
1508                 if (lne.native_offset <= native_offset)
1509                         return lne.il_offset;
1510         }
1511
1512         return -1;
1513 }
1514
1515 static int max_special_addr_diff = 0;
1516
1517 static inline void
1518 emit_advance_op (MonoDwarfWriter *w, int line_diff, int addr_diff)
1519 {
1520         gint64 opcode = 0;
1521
1522         /* Use a special opcode if possible */
1523         if (line_diff - LINE_BASE >= 0 && line_diff - LINE_BASE < LINE_RANGE) {
1524                 if (max_special_addr_diff == 0)
1525                         max_special_addr_diff = (255 - OPCODE_BASE) / LINE_RANGE;
1526
1527                 if (addr_diff > max_special_addr_diff && (addr_diff < 2 * max_special_addr_diff)) {
1528                         emit_byte (w, DW_LNS_const_add_pc);
1529                         addr_diff -= max_special_addr_diff;
1530                 }
1531
1532                 opcode = (line_diff - LINE_BASE) + (LINE_RANGE * addr_diff) + OPCODE_BASE;
1533                 if (opcode > 255)
1534                         opcode = 0;
1535         }
1536
1537         if (opcode != 0) {
1538                 emit_byte (w, opcode);
1539         } else {
1540                 //printf ("large: %d %d %d\n", line_diff, addr_diff, max_special_addr_diff);
1541                 emit_byte (w, DW_LNS_advance_line);
1542                 emit_sleb128 (w, line_diff);
1543                 emit_byte (w, DW_LNS_advance_pc);
1544                 emit_sleb128 (w, addr_diff);
1545                 emit_byte (w, DW_LNS_copy);
1546         }
1547 }
1548
1549 static gint
1550 compare_lne (MonoDebugLineNumberEntry *a, MonoDebugLineNumberEntry *b)
1551 {
1552         if (a->native_offset == b->native_offset)
1553                 return a->il_offset - b->il_offset;
1554         else
1555                 return a->native_offset - b->native_offset;
1556 }
1557
1558 static void
1559 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
1560                                            char *start_symbol, char *end_symbol,
1561                                            guint8 *code, guint32 code_size,
1562                                            MonoDebugMethodJitInfo *debug_info)
1563 {
1564         MonoError error;
1565         guint32 prev_line = 0;
1566         guint32 prev_native_offset = 0;
1567         int i, file_index, il_offset, prev_il_offset;
1568         gboolean first = TRUE;
1569         MonoDebugSourceLocation *loc;
1570         char *prev_file_name = NULL;
1571         MonoMethodHeader *header = mono_method_get_header_checked (method, &error);
1572         MonoDebugMethodInfo *minfo;
1573         MonoDebugLineNumberEntry *ln_array;
1574         int *native_to_il_offset = NULL;
1575
1576         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1577
1578         if (!w->emit_line) {
1579                 mono_metadata_free_mh (header);
1580                 return;
1581         }
1582
1583         minfo = mono_debug_lookup_method (method);
1584
1585         /* Compute the native->IL offset mapping */
1586
1587         g_assert (code_size);
1588
1589         ln_array = g_new0 (MonoDebugLineNumberEntry, debug_info->num_line_numbers);
1590         memcpy (ln_array, debug_info->line_numbers, debug_info->num_line_numbers * sizeof (MonoDebugLineNumberEntry));
1591
1592         qsort (ln_array, debug_info->num_line_numbers, sizeof (MonoDebugLineNumberEntry), (int (*)(const void *, const void *))compare_lne);
1593
1594         native_to_il_offset = g_new0 (int, code_size + 1);
1595
1596         for (i = 0; i < debug_info->num_line_numbers; ++i) {
1597                 int j;
1598                 MonoDebugLineNumberEntry *lne = &ln_array [i];
1599
1600                 if (i == 0) {
1601                         for (j = 0; j < lne->native_offset; ++j)
1602                                 native_to_il_offset [j] = -1;
1603                 }
1604
1605                 if (i < debug_info->num_line_numbers - 1) {
1606                         MonoDebugLineNumberEntry *lne_next = &ln_array [i + 1];
1607
1608                         for (j = lne->native_offset; j < lne_next->native_offset; ++j)
1609                                 native_to_il_offset [j] = lne->il_offset;
1610                 } else {
1611                         for (j = lne->native_offset; j < code_size; ++j)
1612                                 native_to_il_offset [j] = lne->il_offset;
1613                 }
1614         }
1615         g_free (ln_array);
1616
1617         prev_line = 1;
1618         prev_il_offset = -1;
1619
1620         w->cur_file_index = -1;
1621         for (i = 0; i < code_size; ++i) {
1622                 int line_diff, addr_diff;
1623
1624                 if (!minfo)
1625                         continue;
1626
1627                 if (!debug_info->line_numbers)
1628                         continue;
1629
1630                 if (native_to_il_offset)
1631                         il_offset = native_to_il_offset [i];
1632                 else
1633                         il_offset = il_offset_from_address (method, debug_info, i);
1634                 /*
1635                 il_offset = il_offset_from_address (method, debug_info, i);
1636
1637                 g_assert (il_offset == native_to_il_offset [i]);
1638                 */
1639
1640                 il_offset = native_to_il_offset [i];
1641                 if (il_offset < 0)
1642                         continue;
1643
1644                 if (il_offset == prev_il_offset)
1645                         continue;
1646
1647                 prev_il_offset = il_offset;
1648
1649                 loc = mono_debug_symfile_lookup_location (minfo, il_offset);
1650                 if (!loc)
1651                         continue;
1652                 if (!loc->source_file) {
1653                         mono_debug_symfile_free_location (loc);
1654                         continue;
1655                 }
1656
1657                 line_diff = (gint32)loc->row - (gint32)prev_line;
1658                 addr_diff = i - prev_native_offset;
1659
1660                 if (first) {
1661                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1662
1663                         emit_byte (w, 0);
1664                         emit_byte (w, sizeof (gpointer) + 1);
1665                         emit_byte (w, DW_LNE_set_address);
1666                         if (start_symbol)
1667                                 emit_pointer_unaligned (w, start_symbol);
1668                         else
1669                                 emit_pointer_value (w, code);
1670                         first = FALSE;
1671                 }
1672
1673                 if (loc->row != prev_line) {
1674                         if (!prev_file_name || strcmp (loc->source_file, prev_file_name) != 0) {
1675                                 /* Add an entry to the file table */
1676                                 /* FIXME: Avoid duplicates */
1677                                 file_index = get_line_number_file_name (w, loc->source_file) + 1;
1678                                 g_free (prev_file_name);
1679                                 prev_file_name = g_strdup (loc->source_file);
1680
1681                                 if (w->cur_file_index != file_index) {
1682                                         emit_byte (w, DW_LNS_set_file);
1683                                         emit_uleb128 (w, file_index);
1684                                         emit_byte (w, DW_LNS_copy);
1685                                         w->cur_file_index = file_index;
1686                                 }
1687                         }
1688                 }
1689
1690                 if (loc->row != prev_line) {
1691                         if (prev_native_offset == 0)
1692                                 emit_byte (w, DW_LNE_set_prologue_end);
1693
1694                         //printf ("X: %p(+0x%x) %d %s:%d(+%d)\n", code + i, addr_diff, loc->il_offset, loc->source_file, loc->row, line_diff);
1695                         emit_advance_op (w, line_diff, addr_diff);
1696
1697                         prev_line = loc->row;
1698                         prev_native_offset = i;
1699                 }
1700
1701                 mono_debug_symfile_free_location (loc);
1702                 first = FALSE;
1703         }
1704
1705         g_free (native_to_il_offset);
1706         g_free (prev_file_name);
1707
1708         if (!first) {
1709                 emit_byte (w, DW_LNS_advance_pc);
1710                 emit_sleb128 (w, code_size - prev_native_offset);
1711                 emit_byte (w, DW_LNS_copy);
1712
1713                 emit_byte (w, 0);
1714                 emit_byte (w, 1);
1715                 emit_byte (w, DW_LNE_end_sequence);
1716         } else if (!start_symbol) {
1717                 /* No debug info, XDEBUG mode */
1718                 char *name, *dis;
1719                 const guint8 *ip = header->code;
1720                 int prev_line, prev_native_offset;
1721                 int *il_to_line;
1722
1723                 /*
1724                  * Emit the IL code into a temporary file and emit line number info
1725                  * referencing that file.
1726                  */
1727
1728                 name = mono_method_full_name (method, TRUE);
1729                 fprintf (w->il_file, "// %s\n", name);
1730                 w->il_file_line_index ++;
1731                 g_free (name);
1732
1733                 il_to_line = g_new0 (int, header->code_size);
1734
1735                 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1736                 emit_byte (w, 0);
1737                 emit_byte (w, sizeof (gpointer) + 1);
1738                 emit_byte (w, DW_LNE_set_address);
1739                 emit_pointer_value (w, code);
1740
1741                 // FIXME: Optimize this
1742                 while (ip < header->code + header->code_size) {
1743                         int il_offset = ip - header->code;
1744
1745                         /* Emit IL */
1746                         w->il_file_line_index ++;
1747
1748                         dis = disasm_ins (method, ip, &ip);
1749                         fprintf (w->il_file, "%s\n", dis);
1750                         g_free (dis);
1751
1752                         il_to_line [il_offset] = w->il_file_line_index;
1753                 }
1754
1755                 /* Emit line number info */
1756                 prev_line = 1;
1757                 prev_native_offset = 0;
1758                 for (i = 0; i < debug_info->num_line_numbers; ++i) {
1759                         MonoDebugLineNumberEntry *lne = &debug_info->line_numbers [i];
1760                         int line;
1761
1762                         if (lne->il_offset >= header->code_size)
1763                                 continue;
1764                         line = il_to_line [lne->il_offset];
1765                         if (!line) {
1766                                 /*
1767                                  * This seems to happen randomly, it looks like il_offset points
1768                                  * into the middle of an instruction.
1769                                  */
1770                                 continue;
1771                                 /*
1772                                 printf ("%s\n", mono_method_full_name (method, TRUE));
1773                                 printf ("%d %d\n", lne->il_offset, header->code_size);
1774                                 g_assert (line);
1775                                 */
1776                         }
1777
1778                         if (line - prev_line != 0) {
1779                                 emit_advance_op (w, line - prev_line, (gint32)lne->native_offset - prev_native_offset);
1780
1781                                 prev_line = line;
1782                                 prev_native_offset = lne->native_offset;
1783                         }
1784                 }
1785
1786                 emit_byte (w, DW_LNS_advance_pc);
1787                 emit_sleb128 (w, code_size - prev_native_offset);
1788                 emit_byte (w, DW_LNS_copy);
1789
1790                 emit_byte (w, 0);
1791                 emit_byte (w, 1);
1792                 emit_byte (w, DW_LNE_end_sequence);
1793
1794                 fflush (w->il_file);
1795                 g_free (il_to_line);
1796         }
1797         mono_metadata_free_mh (header);
1798 }
1799
1800 static MonoMethodVar*
1801 find_vmv (MonoCompile *cfg, MonoInst *ins)
1802 {
1803         int j;
1804
1805         if (cfg->varinfo) {
1806                 for (j = 0; j < cfg->num_varinfo; ++j) {
1807                         if (cfg->varinfo [j] == ins)
1808                                 break;
1809                 }
1810
1811                 if (j < cfg->num_varinfo) {
1812                         return MONO_VARINFO (cfg, j);
1813                 }
1814         }
1815
1816         return NULL;
1817 }
1818
1819 void
1820 mono_dwarf_writer_emit_method (MonoDwarfWriter *w, MonoCompile *cfg, MonoMethod *method, char *start_symbol, char *end_symbol, char *linkage_name,
1821                                                            guint8 *code, guint32 code_size, MonoInst **args, MonoInst **locals, GSList *unwind_info, MonoDebugMethodJitInfo *debug_info)
1822 {
1823         MonoError error;
1824         char *name;
1825         MonoMethodSignature *sig;
1826         MonoMethodHeader *header;
1827         char **names;
1828         MonoDebugLocalsInfo *locals_info;
1829         MonoDebugMethodInfo *minfo;
1830         MonoDebugSourceLocation *loc = NULL;
1831         int i;
1832         guint8 buf [128];
1833         guint8 *p;
1834
1835         emit_section_change (w, ".debug_info", 0);
1836
1837         sig = mono_method_signature (method);
1838         header = mono_method_get_header_checked (method, &error);
1839         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1840
1841         /* Parameter types */
1842         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1843                 MonoType *t;
1844
1845                 if (i == 0 && sig->hasthis) {
1846                         if (method->klass->valuetype)
1847                                 t = &method->klass->this_arg;
1848                         else
1849                                 t = &method->klass->byval_arg;
1850                 } else {
1851                         t = sig->params [i - sig->hasthis];
1852                 }
1853
1854                 emit_type (w, t);
1855         }
1856         //emit_type (w, &mono_defaults.int32_class->byval_arg);
1857
1858         /* Local types */
1859         for (i = 0; i < header->num_locals; ++i) {
1860                 emit_type (w, header->locals [i]);
1861         }
1862
1863         minfo = mono_debug_lookup_method (method);
1864         if (minfo)
1865                 loc = mono_debug_symfile_lookup_location (minfo, 0);
1866
1867         /* Subprogram */
1868         names = g_new0 (char *, sig->param_count);
1869         mono_method_get_param_names (method, (const char **) names);
1870
1871         emit_uleb128 (w, ABBREV_SUBPROGRAM);
1872         /* DW_AT_name */
1873         name = mono_method_full_name (method, FALSE);
1874         emit_escaped_string (w, name);
1875         /* DW_AT_MIPS_linkage_name */
1876         if (linkage_name)
1877                 emit_string (w, linkage_name);
1878         else
1879                 emit_string (w, "");
1880         /* DW_AT_decl_file/DW_AT_decl_line */
1881         if (loc) {
1882                 int file_index = add_line_number_file_name (w, loc->source_file, 0, 0);
1883                 emit_uleb128 (w, file_index + 1);
1884                 emit_uleb128 (w, loc->row);
1885
1886                 mono_debug_symfile_free_location (loc);
1887                 loc = NULL;
1888         } else {
1889                 emit_uleb128 (w, 0);
1890                 emit_uleb128 (w, 0);
1891         }
1892 #ifndef TARGET_IOS
1893         emit_string (w, name);
1894 #endif
1895         g_free (name);
1896         if (start_symbol) {
1897                 emit_pointer_unaligned (w, start_symbol);
1898                 emit_pointer_unaligned (w, end_symbol);
1899         } else {
1900                 emit_pointer_value (w, code);
1901                 emit_pointer_value (w, code + code_size);
1902         }
1903         /* frame_base */
1904         emit_byte (w, 2);
1905         emit_byte (w, DW_OP_breg6);
1906         emit_byte (w, 16);
1907
1908         /* Parameters */
1909         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1910                 MonoInst *arg = args ? args [i] : NULL;
1911                 MonoType *t;
1912                 const char *pname;
1913                 char pname_buf [128];
1914                 MonoMethodVar *vmv = NULL;
1915                 gboolean need_loclist = FALSE;
1916
1917                 vmv = find_vmv (cfg, arg);
1918                 if (code && vmv && (vmv->live_range_start || vmv->live_range_end))
1919                         need_loclist = TRUE;
1920
1921                 if (i == 0 && sig->hasthis) {
1922                         if (method->klass->valuetype)
1923                                 t = &method->klass->this_arg;
1924                         else
1925                                 t = &method->klass->byval_arg;
1926                         pname = "this";
1927                 } else {
1928                         t = sig->params [i - sig->hasthis];
1929                         pname = names [i - sig->hasthis];
1930                 }
1931
1932                 emit_uleb128 (w, need_loclist ? ABBREV_PARAM_LOCLIST : ABBREV_PARAM);
1933                 /* name */
1934                 if (pname[0] == '\0') {
1935                         sprintf (pname_buf, "param%d", i - sig->hasthis);
1936                         pname = pname_buf;
1937                 }
1938                 emit_string (w, pname);
1939                 /* type */
1940                 if (!arg || arg->flags & MONO_INST_IS_DEAD)
1941                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1942                 else
1943                         emit_var_type (w, t);
1944
1945                 p = buf;
1946                 encode_var_location (w, arg, p, &p);
1947                 if (need_loclist) {
1948                         vmv->live_range_start = 0;
1949                         if (vmv->live_range_end == 0)
1950                                 /* FIXME: Uses made in calls are not recorded */
1951                                 vmv->live_range_end = code_size;
1952                         emit_loclist (w, arg, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
1953                 } else {
1954                         emit_byte (w, p - buf);
1955                         emit_bytes (w, buf, p - buf);
1956                 }
1957         }
1958         g_free (names);
1959
1960         /* Locals */
1961         locals_info = mono_debug_lookup_locals (method);
1962
1963         for (i = 0; i < header->num_locals; ++i) {
1964                 MonoInst *ins = locals [i];
1965                 char name_buf [128];
1966                 int j;
1967                 MonoMethodVar *vmv = NULL;
1968                 gboolean need_loclist = FALSE;
1969                 char *lname;
1970
1971                 /* ins->dreg no longer contains the original vreg */
1972                 vmv = find_vmv (cfg, ins);
1973                 if (code && vmv) {
1974                         if (vmv->live_range_start) {
1975                                 /* This variable has a precise live range */
1976                                 need_loclist = TRUE;
1977                         }
1978                 }
1979
1980                 emit_uleb128 (w, need_loclist ? ABBREV_VARIABLE_LOCLIST : ABBREV_VARIABLE);
1981                 /* name */
1982                 lname = NULL;
1983                 if (locals_info) {
1984                         for (j = 0; j < locals_info->num_locals; ++j)
1985                                 if (locals_info->locals [j].index == i)
1986                                         break;
1987                         if (j < locals_info->num_locals)
1988                                 lname = locals_info->locals [j].name;
1989                 }
1990                 if (lname) {
1991                         emit_string (w, lname);
1992                 } else {
1993                         sprintf (name_buf, "V_%d", i);
1994                         emit_string (w, name_buf);
1995                 }
1996                 /* type */
1997                 if (!ins || ins->flags & MONO_INST_IS_DEAD)
1998                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1999                 else
2000                         emit_var_type (w, header->locals [i]);
2001
2002                 p = buf;
2003                 encode_var_location (w, ins, p, &p);
2004
2005                 if (need_loclist) {
2006                         if (vmv->live_range_end == 0)
2007                                 /* FIXME: Uses made in calls are not recorded */
2008                                 vmv->live_range_end = code_size;
2009                         emit_loclist (w, ins, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
2010                 } else {
2011                         emit_byte (w, p - buf);
2012                         emit_bytes (w, buf, p - buf);
2013                 }
2014         }
2015
2016         if (locals_info)
2017                 mono_debug_free_locals (locals_info);
2018
2019         /* Subprogram end */
2020         emit_uleb128 (w, 0x0);
2021
2022         emit_line (w);
2023
2024         emit_debug_info_end (w);
2025
2026         /* Emit unwind info */
2027         if (unwind_info) {
2028                 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, TRUE);
2029                 w->fde_index ++;
2030         }
2031
2032         /* Save the information needed to emit the line number info later at once */
2033         /* != could happen when using --regression */
2034         if (debug_info && (debug_info->code_start == code)) {
2035                 MethodLineNumberInfo *info;
2036
2037                 info = g_new0 (MethodLineNumberInfo, 1);
2038                 info->method = method;
2039                 info->start_symbol = g_strdup (start_symbol);
2040                 info->end_symbol = g_strdup (end_symbol);
2041                 info->code = code;
2042                 info->code_size = code_size;
2043                 w->line_info = g_slist_prepend (w->line_info, info);
2044         }
2045
2046         emit_line (w);
2047         mono_metadata_free_mh (header);
2048 }
2049
2050 void
2051 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)
2052 {
2053         emit_section_change (w, ".debug_info", 0);
2054
2055         /* Subprogram */
2056         emit_uleb128 (w, ABBREV_TRAMP_SUBPROGRAM);
2057         emit_string (w, tramp_name);
2058         emit_pointer_value (w, code);
2059         emit_pointer_value (w, code + code_size);
2060
2061         /* Subprogram end */
2062         emit_uleb128 (w, 0x0);
2063
2064         emit_debug_info_end (w);
2065
2066         /* Emit unwind info */
2067         emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, FALSE);
2068         w->fde_index ++;
2069 }
2070 #endif /* End of: !defined(DISABLE_AOT) && !defined(DISABLE_JIT) */