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         MonoDebugMethodJitInfo *debug_info;
  39 } MethodLineNumberInfo;
  40
  41 struct _MonoDwarfWriter
  42 {
  43         MonoImageWriter *w;
  44         GHashTable *class_to_die, *class_to_vtype_die, *class_to_pointer_die;
  45         GHashTable *class_to_reference_die;
  46         int fde_index, tdie_index, line_number_file_index, line_number_dir_index;
  47         GHashTable *file_to_index, *index_to_file, *dir_to_index;
  48         FILE *il_file;
  49         int il_file_line_index, loclist_index;
  50         GSList *cie_program;
  51         FILE *fp;
  52         const char *temp_prefix;
  53         gboolean emit_line, appending, collect_line_info;
  54         GSList *line_info;
  55         int cur_file_index;
  56 };
  57
  58 static void
  59 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
  60                                            char *start_symbol, char *end_symbol,
  61                                            guint8 *code, guint32 code_size,
  62                                            MonoDebugMethodJitInfo *debug_info);
  63
  64 /*
  65  * mono_dwarf_writer_create:
  66  *
  67  *   Create a DWARF writer object. WRITER is the underlying image writer this
  68  * writer will emit to. IL_FILE is the file where IL code will be dumped to for
  69  * methods which have no line number info. It can be NULL.
  70  * If APPENDING is TRUE, the output file will be in assembleable state after each
  71  * call to the _emit_ functions. This is used for XDEBUG. If APPENDING is FALSE,
  72  * a separate mono_dwarf_writer_close () call is needed to finish the emission of
  73  * debug information.
  74  */
  75 MonoDwarfWriter*
  76 mono_dwarf_writer_create (MonoImageWriter *writer, FILE *il_file, int il_file_start_line, gboolean appending, gboolean emit_line_numbers)
  77 {
  78         MonoDwarfWriter *w = g_new0 (MonoDwarfWriter, 1);
  79
  80         /*
  81          * The appending flag is needed because we use subsections to order things in
  82          * the debug info, and:
  83          * - apple's assembler doesn't support them
  84          * - the binary writer has problems with subsections+alignment
  85          * So instead of subsections, we use the _close () function in AOT mode,
  86          * which writes out things in order.
  87          */
  88
  89         w->w = writer;
  90         w->il_file = il_file;
  91         w->il_file_line_index = il_file_start_line;
  92         w->appending = appending;
  93
  94         if (appending)
  95                 g_assert (img_writer_subsections_supported (w->w));
  96
  97         w->emit_line = TRUE;
  98
  99         if (appending) {
 100                 if (!img_writer_subsections_supported (w->w))
 101                         /* Can't emit line number info without subsections */
 102                         w->emit_line = FALSE;
 103         } else {
 104                 /* Collect line number info and emit it at once */
 105                 w->collect_line_info = TRUE;
 106         }
 107
 108         if (!emit_line_numbers) {
 109                 w->emit_line = FALSE;
 110                 w->collect_line_info = FALSE;
 111         }
 112
 113         w->fp = img_writer_get_fp (w->w);
 114         w->temp_prefix = img_writer_get_temp_label_prefix (w->w);
 115
 116         w->class_to_die = g_hash_table_new (NULL, NULL);
 117         w->class_to_vtype_die = g_hash_table_new (NULL, NULL);
 118         w->class_to_pointer_die = g_hash_table_new (NULL, NULL);
 119         w->class_to_reference_die = g_hash_table_new (NULL, NULL);
 120         w->cur_file_index = -1;
 121
 122         return w;
 123 }
 124
 125 void
 126 mono_dwarf_writer_destroy (MonoDwarfWriter *w)
 127 {
 128         g_free (w);
 129 }
 130
 131 int
 132 mono_dwarf_writer_get_il_file_line_index (MonoDwarfWriter *w)
 133 {
 134         return w->il_file_line_index;
 135 }
 136
 137 /* Wrappers around the image writer functions */
 138
 139 static inline void
 140 emit_section_change (MonoDwarfWriter *w, const char *section_name, int subsection_index)
 141 {
 142         img_writer_emit_section_change (w->w, section_name, subsection_index);
 143 }
 144
 145 static inline void
 146 emit_push_section (MonoDwarfWriter *w, const char *section_name, int subsection)
 147 {
 148         img_writer_emit_push_section (w->w, section_name, subsection);
 149 }
 150
 151 static inline void
 152 emit_pop_section (MonoDwarfWriter *w)
 153 {
 154         img_writer_emit_pop_section (w->w);
 155 }
 156
 157 static inline void
 158 emit_local_symbol (MonoDwarfWriter *w, const char *name, const char *end_label, gboolean func)
 159 {
 160         img_writer_emit_local_symbol (w->w, name, end_label, func);
 161 }
 162
 163 static inline void
 164 emit_label (MonoDwarfWriter *w, const char *name)
 165 {
 166         img_writer_emit_label (w->w, name);
 167 }
 168
 169 static inline void
 170 emit_bytes (MonoDwarfWriter *w, const guint8* buf, int size)
 171 {
 172         img_writer_emit_bytes (w->w, buf, size);
 173 }
 174
 175 static inline void
 176 emit_string (MonoDwarfWriter *w, const char *value)
 177 {
 178         img_writer_emit_string (w->w, value);
 179 }
 180
 181 static inline void
 182 emit_line (MonoDwarfWriter *w)
 183 {
 184         img_writer_emit_line (w->w);
 185 }
 186
 187 static inline void
 188 emit_alignment (MonoDwarfWriter *w, int size)
 189 {
 190         img_writer_emit_alignment (w->w, size);
 191 }
 192
 193 static inline void
 194 emit_pointer_unaligned (MonoDwarfWriter *w, const char *target)
 195 {
 196         img_writer_emit_pointer_unaligned (w->w, target);
 197 }
 198
 199 static inline void
 200 emit_pointer (MonoDwarfWriter *w, const char *target)
 201 {
 202         img_writer_emit_pointer (w->w, target);
 203 }
 204
 205 static inline void
 206 emit_int16 (MonoDwarfWriter *w, int value)
 207 {
 208         img_writer_emit_int16 (w->w, value);
 209 }
 210
 211 static inline void
 212 emit_int32 (MonoDwarfWriter *w, int value)
 213 {
 214         img_writer_emit_int32 (w->w, value);
 215 }
 216
 217 static inline void
 218 emit_symbol_diff (MonoDwarfWriter *w, const char *end, const char* start, int offset)
 219 {
 220         img_writer_emit_symbol_diff (w->w, end, start, offset);
 221 }
 222
 223 static inline void
 224 emit_zero_bytes (MonoDwarfWriter *w, int num)
 225 {
 226         img_writer_emit_zero_bytes (w->w, num);
 227 }
 228
 229 static inline void
 230 emit_byte (MonoDwarfWriter *w, guint8 val)
 231 {
 232         img_writer_emit_byte (w->w, val);
 233 }
 234
 235 static G_GNUC_UNUSED void
 236 emit_uleb128 (MonoDwarfWriter *w, guint32 value)
 237 {
 238         do {
 239                 guint8 b = value & 0x7f;
 240                 value >>= 7;
 241                 if (value != 0) /* more bytes to come */
 242                         b |= 0x80;
 243                 emit_byte (w, b);
 244         } while (value);
 245 }
 246
 247 static G_GNUC_UNUSED void
 248 emit_sleb128 (MonoDwarfWriter *w, gint64 value)
 249 {
 250         gboolean more = 1;
 251         gboolean negative = (value < 0);
 252         guint32 size = 64;
 253         guint8 byte;
 254
 255         while (more) {
 256                 byte = value & 0x7f;
 257                 value >>= 7;
 258                 /* the following is unnecessary if the
 259                  * implementation of >>= uses an arithmetic rather
 260                  * than logical shift for a signed left operand
 261                  */
 262                 if (negative)
 263                         /* sign extend */
 264                         value |= - ((gint64)1 <<(size - 7));
 265                 /* sign bit of byte is second high order bit (0x40) */
 266                 if ((value == 0 && !(byte & 0x40)) ||
 267                         (value == -1 && (byte & 0x40)))
 268                         more = 0;
 269                 else
 270                         byte |= 0x80;
 271                 emit_byte (w, byte);
 272         }
 273 }
 274
 275 static G_GNUC_UNUSED void
 276 encode_uleb128 (guint32 value, guint8 *buf, guint8 **endbuf)
 277 {
 278         guint8 *p = buf;
 279
 280         do {
 281                 guint8 b = value & 0x7f;
 282                 value >>= 7;
 283                 if (value != 0) /* more bytes to come */
 284                         b |= 0x80;
 285                 *p ++ = b;
 286         } while (value);
 287
 288         *endbuf = p;
 289 }
 290
 291 static G_GNUC_UNUSED void
 292 encode_sleb128 (gint32 value, guint8 *buf, guint8 **endbuf)
 293 {
 294         gboolean more = 1;
 295         gboolean negative = (value < 0);
 296         guint32 size = 32;
 297         guint8 byte;
 298         guint8 *p = buf;
 299
 300         while (more) {
 301                 byte = value & 0x7f;
 302                 value >>= 7;
 303                 /* the following is unnecessary if the
 304                  * implementation of >>= uses an arithmetic rather
 305                  * than logical shift for a signed left operand
 306                  */
 307                 if (negative)
 308                         /* sign extend */
 309                         value |= - (1 <<(size - 7));
 310                 /* sign bit of byte is second high order bit (0x40) */
 311                 if ((value == 0 && !(byte & 0x40)) ||
 312                         (value == -1 && (byte & 0x40)))
 313                         more = 0;
 314                 else
 315                         byte |= 0x80;
 316                 *p ++= byte;
 317         }
 318
 319         *endbuf = p;
 320 }
 321
 322 static void
 323 emit_dwarf_abbrev (MonoDwarfWriter *w, int code, int tag, gboolean has_child,
 324                                    int *attrs, int attrs_len)
 325 {
 326         int i;
 327
 328         emit_uleb128 (w, code);
 329         emit_uleb128 (w, tag);
 330         emit_byte (w, has_child);
 331
 332         for (i = 0; i < attrs_len; i++)
 333                 emit_uleb128 (w, attrs [i]);
 334         emit_uleb128 (w, 0);
 335         emit_uleb128 (w, 0);
 336 }
 337
 338 static void
 339 emit_cie (MonoDwarfWriter *w)
 340 {
 341         emit_section_change (w, ".debug_frame", 0);
 342
 343         emit_alignment (w, 8);
 344
 345         /* Emit a CIE */
 346         emit_symbol_diff (w, ".Lcie0_end", ".Lcie0_start", 0); /* length */
 347         emit_label (w, ".Lcie0_start");
 348         emit_int32 (w, 0xffffffff); /* CIE id */
 349         emit_byte (w, 3); /* version */
 350         emit_string (w, ""); /* augmention */
 351         emit_sleb128 (w, 1); /* code alignment factor */
 352         emit_sleb128 (w, mono_unwind_get_dwarf_data_align ()); /* data alignment factor */
 353         emit_uleb128 (w, mono_unwind_get_dwarf_pc_reg ());
 354
 355         w->cie_program = w->cie_program;
 356         if (w->cie_program) {
 357                 guint32 uw_info_len;
 358                 guint8 *uw_info = mono_unwind_ops_encode (w->cie_program, &uw_info_len);
 359                 emit_bytes (w, uw_info, uw_info_len);
 360                 g_free (uw_info);
 361         }
 362
 363         emit_alignment (w, sizeof (gpointer));
 364         emit_label (w, ".Lcie0_end");
 365 }
 366
 367 static void
 368 emit_pointer_value (MonoDwarfWriter *w, gpointer ptr)
 369 {
 370         gssize val = (gssize)ptr;
 371         emit_bytes (w, (guint8*)&val, sizeof (gpointer));
 372 }
 373
 374 static void
 375 emit_fde (MonoDwarfWriter *w, int fde_index, char *start_symbol, char *end_symbol,
 376                   guint8 *code, guint32 code_size, GSList *unwind_ops, gboolean use_cie)
 377 {
 378         char symbol1 [128];
 379         char symbol2 [128];
 380         GSList *l;
 381         guint8 *uw_info;
 382         guint32 uw_info_len;
 383
 384         emit_section_change (w, ".debug_frame", 0);
 385
 386         sprintf (symbol1, ".Lfde%d_start", fde_index);
 387         sprintf (symbol2, ".Lfde%d_end", fde_index);
 388         emit_symbol_diff (w, symbol2, symbol1, 0); /* length */
 389         emit_label (w, symbol1);
 390         emit_int32 (w, 0); /* CIE_pointer */
 391         if (start_symbol) {
 392                 emit_pointer (w, start_symbol); /* initial_location */
 393                 if (end_symbol)
 394                         emit_symbol_diff (w, end_symbol, start_symbol, 0); /* address_range */
 395                 else {
 396                         g_assert (code_size);
 397                         emit_int32 (w, code_size);
 398                 }
 399         } else {
 400                 emit_pointer_value (w, code);
 401                 emit_int32 (w, code_size);
 402         }
 403 #if SIZEOF_VOID_P == 8
 404         /* Upper 32 bits of code size */
 405         emit_int32 (w, 0);
 406 #endif
 407
 408         l = unwind_ops;
 409         if (w->cie_program) {
 410                 // FIXME: Check that the ops really begin with the CIE program */
 411                 int i;
 412
 413                 for (i = 0; i < g_slist_length (w->cie_program); ++i)
 414                         if (l)
 415                                 l = l->next;
 416         }
 417
 418         /* Convert the list of MonoUnwindOps to the format used by DWARF */
 419         uw_info = mono_unwind_ops_encode (l, &uw_info_len);
 420         emit_bytes (w, uw_info, uw_info_len);
 421         g_free (uw_info);
 422
 423         emit_alignment (w, sizeof (mgreg_t));
 424         emit_label (w, symbol2);
 425 }
 426
 427 /* Abbrevations */
 428 #define ABBREV_COMPILE_UNIT 1
 429 #define ABBREV_SUBPROGRAM 2
 430 #define ABBREV_PARAM 3
 431 #define ABBREV_BASE_TYPE 4
 432 #define ABBREV_STRUCT_TYPE 5
 433 #define ABBREV_DATA_MEMBER 6
 434 #define ABBREV_TYPEDEF 7
 435 #define ABBREV_ENUM_TYPE 8
 436 #define ABBREV_ENUMERATOR 9
 437 #define ABBREV_NAMESPACE 10
 438 #define ABBREV_VARIABLE 11
 439 #define ABBREV_VARIABLE_LOCLIST 12
 440 #define ABBREV_POINTER_TYPE 13
 441 #define ABBREV_REFERENCE_TYPE 14
 442 #define ABBREV_PARAM_LOCLIST 15
 443 #define ABBREV_INHERITANCE 16
 444 #define ABBREV_STRUCT_TYPE_NOCHILDREN 17
 445 #define ABBREV_TRAMP_SUBPROGRAM 18
 446
 447 static int compile_unit_attr [] = {
 448         DW_AT_producer     ,DW_FORM_string,
 449     DW_AT_name         ,DW_FORM_string,
 450     DW_AT_comp_dir     ,DW_FORM_string,
 451         DW_AT_language     ,DW_FORM_data1,
 452     DW_AT_low_pc       ,DW_FORM_addr,
 453     DW_AT_high_pc      ,DW_FORM_addr,
 454         DW_AT_stmt_list    ,DW_FORM_data4
 455 };
 456
 457 static int subprogram_attr [] = {
 458         DW_AT_name         , DW_FORM_string,
 459 #ifndef TARGET_IOS
 460         DW_AT_description  , DW_FORM_string,
 461 #endif
 462     DW_AT_low_pc       , DW_FORM_addr,
 463     DW_AT_high_pc      , DW_FORM_addr,
 464         DW_AT_frame_base   , DW_FORM_block1
 465 };
 466
 467 static int tramp_subprogram_attr [] = {
 468         DW_AT_name         , DW_FORM_string,
 469 #ifndef TARGET_IOS
 470         DW_AT_description  , DW_FORM_string,
 471 #endif
 472     DW_AT_low_pc       , DW_FORM_addr,
 473     DW_AT_high_pc      , DW_FORM_addr,
 474 };
 475
 476 static int param_attr [] = {
 477         DW_AT_name,     DW_FORM_string,
 478         DW_AT_type,     DW_FORM_ref4,
 479         DW_AT_location, DW_FORM_block1
 480 };
 481
 482 static int param_loclist_attr [] = {
 483         DW_AT_name,     DW_FORM_string,
 484         DW_AT_type,     DW_FORM_ref4,
 485         DW_AT_location, DW_FORM_data4
 486 };
 487
 488 static int base_type_attr [] = {
 489         DW_AT_byte_size,   DW_FORM_data1,
 490         DW_AT_encoding,    DW_FORM_data1,
 491         DW_AT_name,        DW_FORM_string
 492 };
 493
 494 static int struct_type_attr [] = {
 495         DW_AT_name,        DW_FORM_string,
 496         DW_AT_byte_size,   DW_FORM_udata,
 497 };
 498
 499 static int data_member_attr [] = {
 500         DW_AT_name,        DW_FORM_string,
 501         DW_AT_type,        DW_FORM_ref4,
 502         DW_AT_data_member_location, DW_FORM_block1
 503 };
 504
 505 static int typedef_attr [] = {
 506         DW_AT_name,        DW_FORM_string,
 507         DW_AT_type,        DW_FORM_ref4
 508 };
 509
 510 static int pointer_type_attr [] = {
 511         DW_AT_type,        DW_FORM_ref4,
 512 };
 513
 514 static int reference_type_attr [] = {
 515         DW_AT_type,        DW_FORM_ref4,
 516 };
 517
 518 static int enum_type_attr [] = {
 519         DW_AT_name,        DW_FORM_string,
 520         DW_AT_byte_size,   DW_FORM_udata,
 521         DW_AT_type,        DW_FORM_ref4,
 522 };
 523
 524 static int enumerator_attr [] = {
 525         DW_AT_name,        DW_FORM_string,
 526         DW_AT_const_value, DW_FORM_sdata,
 527 };
 528
 529 static int namespace_attr [] = {
 530         DW_AT_name,        DW_FORM_string,
 531 };
 532
 533 static int variable_attr [] = {
 534         DW_AT_name,     DW_FORM_string,
 535         DW_AT_type,     DW_FORM_ref4,
 536         DW_AT_location, DW_FORM_block1
 537 };
 538
 539 static int variable_loclist_attr [] = {
 540         DW_AT_name,     DW_FORM_string,
 541         DW_AT_type,     DW_FORM_ref4,
 542         DW_AT_location, DW_FORM_data4
 543 };
 544
 545 static int inheritance_attr [] = {
 546         DW_AT_type,        DW_FORM_ref4,
 547         DW_AT_data_member_location, DW_FORM_block1
 548 };
 549
 550 typedef struct DwarfBasicType {
 551         const char *die_name, *name;
 552         int type;
 553         int size;
 554         int encoding;
 555 } DwarfBasicType;
 556
 557 static DwarfBasicType basic_types [] = {
 558         { ".LDIE_I1", "sbyte", MONO_TYPE_I1, 1, DW_ATE_signed },
 559         { ".LDIE_U1", "byte", MONO_TYPE_U1, 1, DW_ATE_unsigned },
 560         { ".LDIE_I2", "short", MONO_TYPE_I2, 2, DW_ATE_signed },
 561         { ".LDIE_U2", "ushort", MONO_TYPE_U2, 2, DW_ATE_unsigned },
 562         { ".LDIE_I4", "int", MONO_TYPE_I4, 4, DW_ATE_signed },
 563         { ".LDIE_U4", "uint", MONO_TYPE_U4, 4, DW_ATE_unsigned },
 564         { ".LDIE_I8", "long", MONO_TYPE_I8, 8, DW_ATE_signed },
 565         { ".LDIE_U8", "ulong", MONO_TYPE_U8, 8, DW_ATE_unsigned },
 566         { ".LDIE_I", "intptr", MONO_TYPE_I, SIZEOF_VOID_P, DW_ATE_signed },
 567         { ".LDIE_U", "uintptr", MONO_TYPE_U, SIZEOF_VOID_P, DW_ATE_unsigned },
 568         { ".LDIE_R4", "float", MONO_TYPE_R4, 4, DW_ATE_float },
 569         { ".LDIE_R8", "double", MONO_TYPE_R8, 8, DW_ATE_float },
 570         { ".LDIE_BOOLEAN", "boolean", MONO_TYPE_BOOLEAN, 1, DW_ATE_boolean },
 571         { ".LDIE_CHAR", "char", MONO_TYPE_CHAR, 2, DW_ATE_unsigned_char },
 572         { ".LDIE_STRING", "string", MONO_TYPE_STRING, sizeof (gpointer), DW_ATE_address },
 573         { ".LDIE_OBJECT", "object", MONO_TYPE_OBJECT, sizeof (gpointer), DW_ATE_address },
 574         { ".LDIE_SZARRAY", "object", MONO_TYPE_SZARRAY, sizeof (gpointer), DW_ATE_address },
 575 };
 576
 577 /* Constants for encoding line number special opcodes */
 578 #define OPCODE_BASE 13
 579 #define LINE_BASE -5
 580 #define LINE_RANGE 14
 581
 582 /* Subsections of the .debug_line section */
 583 #define LINE_SUBSECTION_HEADER 1
 584 #define LINE_SUBSECTION_INCLUDES 2
 585 #define LINE_SUBSECTION_FILES 3
 586 #define LINE_SUBSECTION_DATA 4
 587 #define LINE_SUBSECTION_END 5
 588
 589 static int
 590 emit_line_number_file_name (MonoDwarfWriter *w, const char *name,
 591                                                         gint64 last_mod_time, gint64 file_size)
 592 {
 593         int index;
 594         int dir_index;
 595         char *basename = NULL;
 596
 597         if (!w->file_to_index)
 598                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 599
 600         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 601         if (index > 0)
 602                 return index;
 603
 604         if (g_path_is_absolute (name)) {
 605                 char *dir = g_path_get_dirname (name);
 606
 607                 if (!w->dir_to_index)
 608                         w->dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 609
 610                 dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (w->dir_to_index, dir));
 611                 if (dir_index == 0) {
 612                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 613                         emit_string (w, dir);
 614
 615                         dir_index = ++ w->line_number_dir_index;
 616                         g_hash_table_insert (w->dir_to_index, g_strdup (dir), GUINT_TO_POINTER (dir_index));
 617                 }
 618
 619                 g_free (dir);
 620
 621                 basename = g_path_get_basename (name);
 622         } else {
 623                 dir_index = 0;
 624         }
 625
 626         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 627
 628         if (basename)
 629                 emit_string (w, basename);
 630         else
 631                 emit_string (w, name);
 632         emit_uleb128 (w, dir_index);
 633         emit_byte (w, 0);
 634         emit_byte (w, 0);
 635
 636         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 637
 638         if (basename)
 639                 g_free (basename);
 640
 641         index = ++ w->line_number_file_index;
 642         g_hash_table_insert (w->file_to_index, g_strdup (name), GUINT_TO_POINTER (index));
 643
 644         return index;
 645 }
 646
 647 static int
 648 get_line_number_file_name (MonoDwarfWriter *w, const char *name)
 649 {
 650         int index;
 651
 652         g_assert (w->file_to_index);
 653         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 654         g_assert (index > 0);
 655         return index - 1;
 656 }
 657
 658 static int
 659 add_line_number_file_name (MonoDwarfWriter *w, const char *name,
 660                                                    gint64 last_mod_time, gint64 file_size)
 661 {
 662         int index;
 663         char *copy;
 664
 665         if (!w->file_to_index) {
 666                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 667                 w->index_to_file = g_hash_table_new (NULL, NULL);
 668         }
 669
 670         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 671         if (index > 0)
 672                 return index - 1;
 673         index = w->line_number_file_index;
 674         w->line_number_file_index ++;
 675         copy = g_strdup (name);
 676         g_hash_table_insert (w->file_to_index, copy, GUINT_TO_POINTER (index + 1));
 677         g_hash_table_insert (w->index_to_file, GUINT_TO_POINTER (index + 1), copy);
 678
 679         return index;
 680 }
 681
 682 static void
 683 emit_line_number_info_begin (MonoDwarfWriter *w)
 684 {
 685         /* Line number info header */
 686         /*
 687          * GAS seems to emit its own data to the end of the first subsection, so we use
 688          * subsections 1, 2 etc:
 689          * 1 - contains the header
 690          * 2 - contains the file names
 691          * 3 - contains the end of the header + the data
 692          * 4 - the end symbol
 693          */
 694         emit_section_change (w, ".debug_line", 0);
 695         emit_label (w, ".Ldebug_line_section_start");
 696         emit_section_change (w, ".debug_line", LINE_SUBSECTION_HEADER);
 697         emit_label (w, ".Ldebug_line_start");
 698         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 699         emit_int16 (w, 0x2); /* version */
 700         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 701         emit_byte (w, 1); /* minimum_instruction_length */
 702         emit_byte (w, 1); /* default_is_stmt */
 703         emit_byte (w, LINE_BASE); /* line_base */
 704         emit_byte (w, LINE_RANGE); /* line_range */
 705         emit_byte (w, OPCODE_BASE); /* opcode_base */
 706         emit_byte (w, 0); /* standard_opcode_lengths */
 707         emit_byte (w, 1);
 708         emit_byte (w, 1);
 709         emit_byte (w, 1);
 710         emit_byte (w, 1);
 711         emit_byte (w, 0);
 712         emit_byte (w, 0);
 713         emit_byte (w, 0);
 714         emit_byte (w, 1);
 715         emit_byte (w, 0);
 716         emit_byte (w, 0);
 717         emit_byte (w, 1);
 718
 719         /* Includes */
 720         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 721
 722         /* End of Includes */
 723         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 724         emit_byte (w, 0);
 725
 726         /* Files */
 727         emit_line_number_file_name (w, "xdb.il", 0, 0);
 728
 729         /* End of Files */
 730         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 731         emit_byte (w, 0);
 732
 733         emit_label (w, ".Ldebug_line_header_end");
 734
 735         /* Emit this into a separate subsection so it gets placed at the end */
 736         emit_section_change (w, ".debug_line", LINE_SUBSECTION_END);
 737
 738         emit_byte (w, 0);
 739         emit_byte (w, 1);
 740         emit_byte (w, DW_LNE_end_sequence);
 741
 742         emit_label (w, ".Ldebug_line_end");
 743 }
 744
 745 char *
 746 mono_dwarf_escape_path (const char *name)
 747 {
 748         if (strchr (name, '\\')) {
 749                 char *s;
 750                 int len, i, j;
 751
 752                 len = strlen (name);
 753                 s = g_malloc0 ((len + 1) * 2);
 754                 j = 0;
 755                 for (i = 0; i < len; ++i) {
 756                         if (name [i] == '\\') {
 757                                 s [j ++] = '\\';
 758                                 s [j ++] = '\\';
 759                         } else {
 760                                 s [j ++] = name [i];
 761                         }
 762                 }
 763                 return s;
 764         }
 765         return g_strdup (name);
 766 }
 767
 768 static void
 769 emit_all_line_number_info (MonoDwarfWriter *w)
 770 {
 771         int i;
 772         GHashTable *dir_to_index, *index_to_dir;
 773         GSList *l;
 774         GSList *info_list;
 775
 776         g_assert (w->collect_line_info);
 777
 778         add_line_number_file_name (w, "<unknown>", 0, 0);
 779
 780         /* Collect files */
 781         info_list = g_slist_reverse (w->line_info);
 782         for (l = info_list; l; l = l->next) {
 783                 MethodLineNumberInfo *info = l->data;
 784                 MonoDebugMethodInfo *minfo;
 785                 char *source_file;
 786                 GPtrArray *source_file_list;
 787
 788                 // FIXME: Free stuff
 789                 minfo = mono_debug_lookup_method (info->method);
 790                 if (!minfo)
 791                         continue;
 792
 793                 mono_debug_symfile_get_line_numbers_full (minfo, &source_file, &source_file_list, NULL, NULL, NULL, NULL, NULL);
 794                 for (i = 0; i < source_file_list->len; ++i) {
 795                         MonoDebugSourceInfo *sinfo = g_ptr_array_index (source_file_list, i);
 796                         add_line_number_file_name (w, sinfo->source_file, 0, 0);
 797                 }
 798         }
 799
 800         /* Preprocess files */
 801         dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 802         index_to_dir = g_hash_table_new (NULL, NULL);
 803         for (i = 0; i < w->line_number_file_index; ++i) {
 804                 char *name = g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 805                 char *copy;
 806                 int dir_index = 0;
 807
 808                 if (g_path_is_absolute (name)) {
 809                         char *dir = g_path_get_dirname (name);
 810
 811                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 812                         if (dir_index == 0) {
 813                                 dir_index = w->line_number_dir_index;
 814                                 w->line_number_dir_index ++;
 815                                 copy = g_strdup (dir);
 816                                 g_hash_table_insert (dir_to_index, copy, GUINT_TO_POINTER (dir_index + 1));
 817                                 g_hash_table_insert (index_to_dir, GUINT_TO_POINTER (dir_index + 1), copy);
 818                         } else {
 819                                 dir_index --;
 820                         }
 821
 822                         g_free (dir);
 823                 }
 824         }
 825
 826         /* Line number info header */
 827         emit_section_change (w, ".debug_line", 0);
 828         emit_label (w, ".Ldebug_line_section_start");
 829         emit_label (w, ".Ldebug_line_start");
 830         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 831         emit_int16 (w, 0x2); /* version */
 832         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 833         emit_byte (w, 1); /* minimum_instruction_length */
 834         emit_byte (w, 1); /* default_is_stmt */
 835         emit_byte (w, LINE_BASE); /* line_base */
 836         emit_byte (w, LINE_RANGE); /* line_range */
 837         emit_byte (w, OPCODE_BASE); /* opcode_base */
 838         emit_byte (w, 0); /* standard_opcode_lengths */
 839         emit_byte (w, 1);
 840         emit_byte (w, 1);
 841         emit_byte (w, 1);
 842         emit_byte (w, 1);
 843         emit_byte (w, 0);
 844         emit_byte (w, 0);
 845         emit_byte (w, 0);
 846         emit_byte (w, 1);
 847         emit_byte (w, 0);
 848         emit_byte (w, 0);
 849         emit_byte (w, 1);
 850
 851         /* Includes */
 852         emit_section_change (w, ".debug_line", 0);
 853         for (i = 0; i < w->line_number_dir_index; ++i) {
 854                 char *dir = g_hash_table_lookup (index_to_dir, GUINT_TO_POINTER (i + 1));
 855
 856                 emit_string (w, mono_dwarf_escape_path (dir));
 857         }
 858         /* End of Includes */
 859         emit_byte (w, 0);
 860
 861         /* Files */
 862         for (i = 0; i < w->line_number_file_index; ++i) {
 863                 char *name = g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 864                 char *basename = NULL, *dir;
 865                 int dir_index = 0;
 866
 867                 if (g_path_is_absolute (name)) {
 868                         dir = g_path_get_dirname (name);
 869
 870                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 871                         basename = g_path_get_basename (name);
 872                 }
 873
 874                 if (basename)
 875                         emit_string (w, basename);
 876                 else
 877                         emit_string (w, mono_dwarf_escape_path (name));
 878                 emit_uleb128 (w, dir_index);
 879                 emit_byte (w, 0);
 880                 emit_byte (w, 0);
 881         }
 882
 883         /* End of Files */
 884         emit_byte (w, 0);
 885
 886         emit_label (w, ".Ldebug_line_header_end");
 887
 888         /* Emit line number table */
 889         for (l = info_list; l; l = l->next) {
 890                 MethodLineNumberInfo *info = l->data;
 891
 892                 emit_line_number_info (w, info->method, info->start_symbol, info->end_symbol, info->code, info->code_size, info->debug_info);
 893         }
 894         g_slist_free (info_list);
 895
 896         emit_byte (w, 0);
 897         emit_byte (w, 1);
 898         emit_byte (w, DW_LNE_end_sequence);
 899
 900         emit_label (w, ".Ldebug_line_end");
 901 }
 902
 903 /*
 904  * Some assemblers like apple's do not support subsections, so we can't place
 905  * .Ldebug_info_end at the end of the section using subsections. Instead, we
 906  * define it every time something gets added to the .debug_info section.
 907  * The apple assember seems to use the last definition.
 908  */
 909 static void
 910 emit_debug_info_end (MonoDwarfWriter *w)
 911 {
 912         /* This doesn't seem to work/required with recent iphone sdk versions */
 913 #if 0
 914         if (!img_writer_subsections_supported (w->w))
 915                 fprintf (w->fp, "\n.set %sdebug_info_end,.\n", w->temp_prefix);
 916 #endif
 917 }
 918
 919 void
 920 mono_dwarf_writer_emit_base_info (MonoDwarfWriter *w, GSList *base_unwind_program)
 921 {
 922         char *s, *build_info;
 923         int i;
 924
 925         w->cie_program = base_unwind_program;
 926
 927         emit_section_change (w, ".debug_abbrev", 0);
 928         emit_dwarf_abbrev (w, ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, TRUE,
 929                                            compile_unit_attr, G_N_ELEMENTS (compile_unit_attr));
 930         emit_dwarf_abbrev (w, ABBREV_SUBPROGRAM, DW_TAG_subprogram, TRUE,
 931                                            subprogram_attr, G_N_ELEMENTS (subprogram_attr));
 932         emit_dwarf_abbrev (w, ABBREV_PARAM, DW_TAG_formal_parameter, FALSE,
 933                                            param_attr, G_N_ELEMENTS (param_attr));
 934         emit_dwarf_abbrev (w, ABBREV_PARAM_LOCLIST, DW_TAG_formal_parameter, FALSE,
 935                                            param_loclist_attr, G_N_ELEMENTS (param_loclist_attr));
 936         emit_dwarf_abbrev (w, ABBREV_BASE_TYPE, DW_TAG_base_type, FALSE,
 937                                            base_type_attr, G_N_ELEMENTS (base_type_attr));
 938         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE, DW_TAG_class_type, TRUE,
 939                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 940         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE_NOCHILDREN, DW_TAG_class_type, FALSE,
 941                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 942         emit_dwarf_abbrev (w, ABBREV_DATA_MEMBER, DW_TAG_member, FALSE,
 943                                            data_member_attr, G_N_ELEMENTS (data_member_attr));
 944         emit_dwarf_abbrev (w, ABBREV_TYPEDEF, DW_TAG_typedef, FALSE,
 945                                            typedef_attr, G_N_ELEMENTS (typedef_attr));
 946         emit_dwarf_abbrev (w, ABBREV_ENUM_TYPE, DW_TAG_enumeration_type, TRUE,
 947                                            enum_type_attr, G_N_ELEMENTS (enum_type_attr));
 948         emit_dwarf_abbrev (w, ABBREV_ENUMERATOR, DW_TAG_enumerator, FALSE,
 949                                            enumerator_attr, G_N_ELEMENTS (enumerator_attr));
 950         emit_dwarf_abbrev (w, ABBREV_NAMESPACE, DW_TAG_namespace, TRUE,
 951                                            namespace_attr, G_N_ELEMENTS (namespace_attr));
 952         emit_dwarf_abbrev (w, ABBREV_VARIABLE, DW_TAG_variable, FALSE,
 953                                            variable_attr, G_N_ELEMENTS (variable_attr));
 954         emit_dwarf_abbrev (w, ABBREV_VARIABLE_LOCLIST, DW_TAG_variable, FALSE,
 955                                            variable_loclist_attr, G_N_ELEMENTS (variable_loclist_attr));
 956         emit_dwarf_abbrev (w, ABBREV_POINTER_TYPE, DW_TAG_pointer_type, FALSE,
 957                                            pointer_type_attr, G_N_ELEMENTS (pointer_type_attr));
 958         emit_dwarf_abbrev (w, ABBREV_REFERENCE_TYPE, DW_TAG_reference_type, FALSE,
 959                                            reference_type_attr, G_N_ELEMENTS (reference_type_attr));
 960         emit_dwarf_abbrev (w, ABBREV_INHERITANCE, DW_TAG_inheritance, FALSE,
 961                                            inheritance_attr, G_N_ELEMENTS (inheritance_attr));
 962         emit_dwarf_abbrev (w, ABBREV_TRAMP_SUBPROGRAM, DW_TAG_subprogram, FALSE,
 963                                            tramp_subprogram_attr, G_N_ELEMENTS (tramp_subprogram_attr));
 964         emit_byte (w, 0);
 965
 966         emit_section_change (w, ".debug_info", 0);
 967         emit_label (w, ".Ldebug_info_start");
 968         emit_symbol_diff (w, ".Ldebug_info_end", ".Ldebug_info_begin", 0); /* length */
 969         emit_label (w, ".Ldebug_info_begin");
 970         emit_int16 (w, 0x2); /* DWARF version 2 */
 971         emit_int32 (w, 0); /* .debug_abbrev offset */
 972         emit_byte (w, sizeof (gpointer)); /* address size */
 973
 974         if (img_writer_subsections_supported (w->w) && w->appending) {
 975                 /* Emit this into a separate section so it gets placed at the end */
 976                 emit_section_change (w, ".debug_info", 1);
 977                 emit_byte (w, 0); /* close COMPILE_UNIT */
 978                 emit_label (w, ".Ldebug_info_end");
 979                 emit_section_change (w, ".debug_info", 0);
 980         }
 981
 982         /* Compilation unit */
 983         emit_uleb128 (w, ABBREV_COMPILE_UNIT);
 984         build_info = mono_get_runtime_build_info ();
 985         s = g_strdup_printf ("Mono AOT Compiler %s", build_info);
 986         emit_string (w, s);
 987         g_free (build_info);
 988         g_free (s);
 989         emit_string (w, "JITted code");
 990         emit_string (w, "");
 991         emit_byte (w, DW_LANG_C);
 992         emit_pointer_value (w, 0);
 993         emit_pointer_value (w, 0);
 994         /* offset into .debug_line section */
 995         emit_symbol_diff (w, ".Ldebug_line_start", ".Ldebug_line_section_start", 0);
 996
 997         /* Base types */
 998         for (i = 0; i < G_N_ELEMENTS (basic_types); ++i) {
 999                 emit_label (w, basic_types [i].die_name);
1000                 emit_uleb128 (w, ABBREV_BASE_TYPE);
1001                 emit_byte (w, basic_types [i].size);
1002                 emit_byte (w, basic_types [i].encoding);
1003                 emit_string (w, basic_types [i].name);
1004         }
1005
1006         emit_debug_info_end (w);
1007
1008         /* debug_loc section */
1009         emit_section_change (w, ".debug_loc", 0);
1010         emit_label (w, ".Ldebug_loc_start");
1011
1012         /* debug_line section */
1013         /*
1014          * We emit some info even if emit_line is FALSE, as the
1015          * apple linker seems to require a .debug_line section.
1016          */
1017         if (!w->collect_line_info)
1018                 emit_line_number_info_begin (w);
1019
1020         emit_cie (w);
1021 }
1022
1023 /*
1024  * mono_dwarf_writer_close:
1025  *
1026  *   Finalize the emitted debugging info.
1027  */
1028 void
1029 mono_dwarf_writer_close (MonoDwarfWriter *w)
1030 {
1031         if (!w->appending) {
1032                 emit_section_change (w, ".debug_info", 0);
1033                 emit_byte (w, 0); /* close COMPILE_UNIT */
1034                 emit_label (w, ".Ldebug_info_end");
1035         }
1036
1037         if (w->collect_line_info)
1038                 emit_all_line_number_info (w);
1039 }
1040
1041 static void emit_type (MonoDwarfWriter *w, MonoType *t);
1042 static const char* get_type_die (MonoDwarfWriter *w, MonoType *t);
1043
1044 static const char*
1045 get_class_die (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1046 {
1047         GHashTable *cache;
1048
1049         if (vtype)
1050                 cache = w->class_to_vtype_die;
1051         else
1052                 cache = w->class_to_die;
1053
1054         return g_hash_table_lookup (cache, klass);
1055 }
1056
1057 /* Returns the local symbol pointing to the emitted debug info */
1058 static char*
1059 emit_class_dwarf_info (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1060 {
1061         char *die, *pointer_die, *reference_die;
1062         char *full_name, *p;
1063         gpointer iter;
1064         MonoClassField *field;
1065         const char *fdie;
1066         int k;
1067         gboolean emit_namespace = FALSE, has_children;
1068         GHashTable *cache;
1069
1070         if (vtype)
1071                 cache = w->class_to_vtype_die;
1072         else
1073                 cache = w->class_to_die;
1074
1075         die = g_hash_table_lookup (cache, klass);
1076         if (die)
1077                 return die;
1078
1079         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) ||
1080                   (klass->byval_arg.type >= MONO_TYPE_BOOLEAN && klass->byval_arg.type <= MONO_TYPE_R8 && !vtype)))
1081                 return NULL;
1082
1083         /*
1084          * FIXME: gdb can't handle namespaces in languages it doesn't know about.
1085          */
1086         /*
1087         if (klass->name_space && klass->name_space [0] != '\0')
1088                 emit_namespace = TRUE;
1089         */
1090         if (emit_namespace) {
1091                 emit_uleb128 (w, ABBREV_NAMESPACE);
1092                 emit_string (w, klass->name_space);
1093         }
1094
1095         full_name = g_strdup_printf ("%s%s%s", klass->name_space, klass->name_space ? "." : "", klass->name);
1096         /*
1097          * gdb doesn't support namespaces for non-C++ dwarf objects, so use _
1098          * to separate components.
1099          */
1100         for (p = full_name; *p; p ++)
1101                 if (*p == '.')
1102                         *p = '_';
1103
1104         die = g_strdup_printf (".LTDIE_%d", w->tdie_index);
1105         pointer_die = g_strdup_printf (".LTDIE_%d_POINTER", w->tdie_index);
1106         reference_die = g_strdup_printf (".LTDIE_%d_REFERENCE", w->tdie_index);
1107         w->tdie_index ++;
1108
1109         g_hash_table_insert (w->class_to_pointer_die, klass, pointer_die);
1110         g_hash_table_insert (w->class_to_reference_die, klass, reference_die);
1111         g_hash_table_insert (cache, klass, die);
1112
1113         if (klass->enumtype) {
1114                 int size = mono_class_value_size (mono_class_from_mono_type (mono_class_enum_basetype (klass)), NULL);
1115
1116                 emit_label (w, die);
1117
1118                 emit_uleb128 (w, ABBREV_ENUM_TYPE);
1119                 emit_string (w, full_name);
1120                 emit_uleb128 (w, size);
1121                 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
1122                         if (basic_types [k].type == mono_class_enum_basetype (klass)->type)
1123                                 break;
1124                 g_assert (k < G_N_ELEMENTS (basic_types));
1125                 emit_symbol_diff (w, basic_types [k].die_name, ".Ldebug_info_start", 0);
1126
1127                 /* Emit enum values */
1128                 iter = NULL;
1129                 while ((field = mono_class_get_fields (klass, &iter))) {
1130                         const char *p;
1131                         int len;
1132                         MonoTypeEnum def_type;
1133
1134                         if (strcmp ("value__", mono_field_get_name (field)) == 0)
1135                                 continue;
1136                         if (mono_field_is_deleted (field))
1137                                 continue;
1138
1139                         emit_uleb128 (w, ABBREV_ENUMERATOR);
1140                         emit_string (w, mono_field_get_name (field));
1141
1142                         p = mono_class_get_field_default_value (field, &def_type);
1143                         len = mono_metadata_decode_blob_size (p, &p);
1144                         switch (mono_class_enum_basetype (klass)->type) {
1145                         case MONO_TYPE_U1:
1146                         case MONO_TYPE_I1:
1147                         case MONO_TYPE_BOOLEAN:
1148                                 emit_sleb128 (w, *p);
1149                                 break;
1150                         case MONO_TYPE_U2:
1151                         case MONO_TYPE_I2:
1152                         case MONO_TYPE_CHAR:
1153                                 emit_sleb128 (w, read16 (p));
1154                                 break;
1155                         case MONO_TYPE_U4:
1156                         case MONO_TYPE_I4:
1157                                 emit_sleb128 (w, read32 (p));
1158                                 break;
1159                         case MONO_TYPE_U8:
1160                         case MONO_TYPE_I8:
1161                                 emit_sleb128 (w, read64 (p));
1162                                 break;
1163                         case MONO_TYPE_I:
1164                         case MONO_TYPE_U:
1165 #if SIZEOF_VOID_P == 8
1166                                 emit_sleb128 (w, read64 (p));
1167 #else
1168                                 emit_sleb128 (w, read32 (p));
1169 #endif
1170                                 break;
1171                         default:
1172                                 g_assert_not_reached ();
1173                         }
1174                 }
1175
1176                 has_children = TRUE;
1177         } else {
1178                 guint8 buf [128];
1179                 guint8 *p;
1180                 char *parent_die;
1181
1182                 if (klass->parent)
1183                         parent_die = emit_class_dwarf_info (w, klass->parent, FALSE);
1184                 else
1185                         parent_die = NULL;
1186
1187                 /* Emit field types */
1188                 iter = NULL;
1189                 while ((field = mono_class_get_fields (klass, &iter))) {
1190                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1191                                 continue;
1192
1193                         emit_type (w, field->type);
1194                 }
1195
1196                 iter = NULL;
1197                 has_children = parent_die || mono_class_get_fields (klass, &iter);
1198
1199                 emit_label (w, die);
1200
1201                 emit_uleb128 (w, has_children ? ABBREV_STRUCT_TYPE : ABBREV_STRUCT_TYPE_NOCHILDREN);
1202                 emit_string (w, full_name);
1203                 emit_uleb128 (w, klass->instance_size);
1204
1205                 if (parent_die) {
1206                         emit_uleb128 (w, ABBREV_INHERITANCE);
1207                         emit_symbol_diff (w, parent_die, ".Ldebug_info_start", 0);
1208
1209                         p = buf;
1210                         *p ++= DW_OP_plus_uconst;
1211                         encode_uleb128 (0, p, &p);
1212                         emit_byte (w, p - buf);
1213                         emit_bytes (w, buf, p - buf);
1214                 }
1215
1216                 /* Emit fields */
1217                 iter = NULL;
1218                 while ((field = mono_class_get_fields (klass, &iter))) {
1219                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1220                                 continue;
1221
1222                         fdie = get_type_die (w, field->type);
1223                         if (fdie) {
1224                                 emit_uleb128 (w, ABBREV_DATA_MEMBER);
1225                                 emit_string (w, field->name);
1226                                 emit_symbol_diff (w, fdie, ".Ldebug_info_start", 0);
1227                                 /* location */
1228                                 p = buf;
1229                                 *p ++= DW_OP_plus_uconst;
1230                                 if (klass->valuetype && vtype)
1231                                         encode_uleb128 (field->offset - sizeof (MonoObject), p, &p);
1232                                 else
1233                                         encode_uleb128 (field->offset, p, &p);
1234
1235                                 emit_byte (w, p - buf);
1236                                 emit_bytes (w, buf, p - buf);
1237                         }
1238                 }
1239         }
1240
1241         /* Type end */
1242         if (has_children)
1243                 emit_uleb128 (w, 0x0);
1244
1245         /* Add a typedef, so we can reference the type without a 'struct' in gdb */
1246         emit_uleb128 (w, ABBREV_TYPEDEF);
1247         emit_string (w, full_name);
1248         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1249
1250         /* Add a pointer type */
1251         emit_label (w, pointer_die);
1252
1253         emit_uleb128 (w, ABBREV_POINTER_TYPE);
1254         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1255
1256         /* Add a reference type */
1257         emit_label (w, reference_die);
1258
1259         emit_uleb128 (w, ABBREV_REFERENCE_TYPE);
1260         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1261
1262         g_free (full_name);
1263
1264         if (emit_namespace) {
1265                 /* Namespace end */
1266                 emit_uleb128 (w, 0x0);
1267         }
1268
1269         return die;
1270 }
1271
1272 static gboolean base_types_emitted [64];
1273
1274 static const char*
1275 get_type_die (MonoDwarfWriter *w, MonoType *t)
1276 {
1277         MonoClass *klass = mono_class_from_mono_type (t);
1278         int j;
1279         const char *tdie;
1280
1281         if (t->byref) {
1282                 if (t->type == MONO_TYPE_VALUETYPE) {
1283                         tdie = g_hash_table_lookup (w->class_to_pointer_die, klass);
1284                 }
1285                 else {
1286                         tdie = get_class_die (w, klass, FALSE);
1287                         /* Should return a pointer type to a reference */
1288                 }
1289                 // FIXME:
1290                 t = &mono_defaults.int_class->byval_arg;
1291         }
1292         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1293                 if (basic_types [j].type == t->type)
1294                         break;
1295         if (j < G_N_ELEMENTS (basic_types)) {
1296                 tdie = basic_types [j].die_name;
1297         } else {
1298                 switch (t->type) {
1299                 case MONO_TYPE_CLASS:
1300                         tdie = g_hash_table_lookup (w->class_to_reference_die, klass);
1301                         //tdie = ".LDIE_OBJECT";
1302                         break;
1303                 case MONO_TYPE_ARRAY:
1304                         tdie = ".LDIE_OBJECT";
1305                         break;
1306                 case MONO_TYPE_VALUETYPE:
1307                         if (klass->enumtype)
1308                                 tdie = get_class_die (w, klass, FALSE);
1309                         else
1310                                 tdie = ".LDIE_I4";
1311                         break;
1312                 case MONO_TYPE_GENERICINST:
1313                         if (!MONO_TYPE_ISSTRUCT (t)) {
1314                                 tdie = g_hash_table_lookup (w->class_to_reference_die, klass);
1315                         } else {
1316                                 tdie = ".LDIE_I4";
1317                         }
1318                         break;
1319                 case MONO_TYPE_PTR:
1320                         tdie = ".LDIE_I";
1321                         break;
1322                 default:
1323                         tdie = ".LDIE_I4";
1324                         break;
1325                 }
1326         }
1327
1328         g_assert (tdie);
1329
1330         return tdie;
1331 }
1332
1333 static void
1334 emit_type (MonoDwarfWriter *w, MonoType *t)
1335 {
1336         MonoClass *klass = mono_class_from_mono_type (t);
1337         int j;
1338         const char *tdie;
1339
1340         if (t->byref) {
1341                 if (t->type == MONO_TYPE_VALUETYPE) {
1342                         tdie = emit_class_dwarf_info (w, klass, TRUE);
1343                         if (tdie)
1344                                 return;
1345                 }
1346                 else {
1347                         emit_class_dwarf_info (w, klass, FALSE);
1348                 }
1349                 // FIXME:
1350                 t = &mono_defaults.int_class->byval_arg;
1351         }
1352         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1353                 if (basic_types [j].type == t->type)
1354                         break;
1355         if (j < G_N_ELEMENTS (basic_types)) {
1356                 /* Emit a boxed version of base types */
1357                 if (j < 64 && !base_types_emitted [j]) {
1358                         emit_class_dwarf_info (w, klass, FALSE);
1359                         base_types_emitted [j] = TRUE;
1360                 }
1361         } else {
1362                 switch (t->type) {
1363                 case MONO_TYPE_CLASS:
1364                         emit_class_dwarf_info (w, klass, FALSE);
1365                         break;
1366                 case MONO_TYPE_ARRAY:
1367                         break;
1368                 case MONO_TYPE_VALUETYPE:
1369                         if (klass->enumtype)
1370                                 emit_class_dwarf_info (w, klass, FALSE);
1371                         break;
1372                 case MONO_TYPE_GENERICINST:
1373                         if (!MONO_TYPE_ISSTRUCT (t))
1374                                 emit_class_dwarf_info (w, klass, FALSE);
1375                         break;
1376                 case MONO_TYPE_PTR:
1377                         break;
1378                 default:
1379                         break;
1380                 }
1381         }
1382 }
1383
1384 static void
1385 emit_var_type (MonoDwarfWriter *w, MonoType *t)
1386 {
1387         const char *tdie;
1388
1389         tdie = get_type_die (w, t);
1390
1391         emit_symbol_diff (w, tdie, ".Ldebug_info_start", 0);
1392 }
1393
1394 static void
1395 encode_var_location (MonoDwarfWriter *w, MonoInst *ins, guint8 *p, guint8 **endp)
1396 {
1397         /* location */
1398         /* FIXME: This needs a location list, since the args can go from reg->stack */
1399         if (!ins || ins->flags & MONO_INST_IS_DEAD) {
1400                 /* gdb treats this as optimized out */
1401         } else if (ins->opcode == OP_REGVAR) {
1402                 *p = DW_OP_reg0 + mono_hw_reg_to_dwarf_reg (ins->dreg);
1403                 p ++;
1404         } else if (ins->opcode == OP_REGOFFSET) {
1405                 *p ++= DW_OP_breg0 + mono_hw_reg_to_dwarf_reg (ins->inst_basereg);
1406                 encode_sleb128 (ins->inst_offset, p, &p);
1407         } else {
1408                 // FIXME:
1409                 *p ++ = DW_OP_reg0;
1410         }
1411
1412         *endp = p;
1413 }
1414
1415 static void
1416 emit_loclist (MonoDwarfWriter *w, MonoInst *ins,
1417                           guint8 *loclist_begin_addr, guint8 *loclist_end_addr,
1418                           guint8 *expr, guint32 expr_len)
1419 {
1420         char label [128];
1421
1422         emit_push_section (w, ".debug_loc", 0);
1423         sprintf (label, ".Lloclist_%d", w->loclist_index ++ );
1424         emit_label (w, label);
1425
1426         emit_pointer_value (w, loclist_begin_addr);
1427         emit_pointer_value (w, loclist_end_addr);
1428         emit_byte (w, expr_len % 256);
1429         emit_byte (w, expr_len / 256);
1430         emit_bytes (w, expr, expr_len);
1431
1432         emit_pointer_value (w, NULL);
1433         emit_pointer_value (w, NULL);
1434
1435         emit_pop_section (w);
1436         emit_symbol_diff (w, label, ".Ldebug_loc_start", 0);
1437 }
1438
1439 /*
1440  * MonoDisHelper->tokener doesn't take an IP argument, and we can't add one since
1441  * it is a public header.
1442  */
1443 static const guint8 *token_handler_ip;
1444
1445 static char*
1446 token_handler (MonoDisHelper *dh, MonoMethod *method, guint32 token)
1447 {
1448         char *res, *desc;
1449         MonoMethod *cmethod;
1450         MonoClass *klass;
1451         MonoClassField *field;
1452         gpointer data = NULL;
1453
1454         if (method->wrapper_type)
1455                 data = mono_method_get_wrapper_data (method, token);
1456
1457         switch (*token_handler_ip) {
1458         case CEE_ISINST:
1459         case CEE_CASTCLASS:
1460         case CEE_LDELEMA:
1461                 if (method->wrapper_type)
1462                         klass = data;
1463                 else
1464                         klass = mono_class_get_full (method->klass->image, token, NULL);
1465                 res = g_strdup_printf ("<%s>", klass->name);
1466                 break;
1467         case CEE_NEWOBJ:
1468         case CEE_CALL:
1469         case CEE_CALLVIRT:
1470                 if (method->wrapper_type)
1471                         cmethod = data;
1472                 else
1473                         cmethod = mono_get_method_full (method->klass->image, token, NULL, NULL);
1474                 desc = mono_method_full_name (cmethod, TRUE);
1475                 res = g_strdup_printf ("<%s>", desc);
1476                 g_free (desc);
1477                 break;
1478         case CEE_CALLI:
1479                 if (method->wrapper_type) {
1480                         desc = mono_signature_get_desc (data, FALSE);
1481                         res = g_strdup_printf ("<%s>", desc);
1482                         g_free (desc);
1483                 } else {
1484                         res = g_strdup_printf ("<0x%08x>", token);
1485                 }
1486                 break;
1487         case CEE_LDFLD:
1488         case CEE_LDSFLD:
1489         case CEE_STFLD:
1490         case CEE_STSFLD:
1491                 if (method->wrapper_type)
1492                         field = data;
1493                 else
1494                         field = mono_field_from_token (method->klass->image, token, &klass, NULL);
1495                 desc = mono_field_full_name (field);
1496                 res = g_strdup_printf ("<%s>", desc);
1497                 g_free (desc);
1498                 break;
1499         default:
1500                 res = g_strdup_printf ("<0x%08x>", token);
1501                 break;
1502         }
1503
1504         return res;
1505 }
1506
1507 /*
1508  * disasm_ins:
1509  *
1510  *   Produce a disassembled form of the IL instruction at IP. This is an extension
1511  * of mono_disasm_code_one () which can disasm tokens, handle wrapper methods, and
1512  * CEE_MONO_ opcodes.
1513  */
1514 static char*
1515 disasm_ins (MonoMethod *method, const guchar *ip, const guint8 **endip)
1516 {
1517         char *dis;
1518         MonoDisHelper dh;
1519         MonoMethodHeader *header = mono_method_get_header (method);
1520
1521         memset (&dh, 0, sizeof (dh));
1522         dh.newline = "";
1523         dh.label_format = "IL_%04x: ";
1524         dh.label_target = "IL_%04x";
1525         dh.tokener = token_handler;
1526
1527         token_handler_ip = ip;
1528         if (*ip == MONO_CUSTOM_PREFIX) {
1529                 guint32 token;
1530                 gpointer data;
1531
1532                 switch (ip [1]) {
1533                 case CEE_MONO_ICALL: {
1534                         MonoJitICallInfo *info;
1535
1536                         token = read32 (ip + 2);
1537                         data = mono_method_get_wrapper_data (method, token);
1538                         info = mono_find_jit_icall_by_addr (data);
1539                         g_assert (info);
1540
1541                         dis = g_strdup_printf ("IL_%04x: mono_icall <%s>", (int)(ip - header->code), info->name);
1542                         ip += 6;
1543                         break;
1544                 }
1545                 case CEE_MONO_CLASSCONST: {
1546                         token = read32 (ip + 2);
1547                         data = mono_method_get_wrapper_data (method, token);
1548
1549                         dis = g_strdup_printf ("IL_%04x: mono_classconst <%s>", (int)(ip - header->code), ((MonoClass*)data)->name);
1550                         ip += 6;
1551                         break;
1552                 }
1553                 default:
1554                         dis = mono_disasm_code_one (&dh, method, ip, &ip);
1555                 }
1556         } else {
1557                 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1558         }
1559         token_handler_ip = NULL;
1560
1561         *endip = ip;
1562         mono_metadata_free_mh (header);
1563         return dis;
1564 }
1565
1566 static gint32
1567 il_offset_from_address (MonoMethod *method, MonoDebugMethodJitInfo *jit,
1568                                                 guint32 native_offset)
1569 {
1570         int i;
1571
1572         if (!jit->line_numbers)
1573                 return -1;
1574
1575         for (i = jit->num_line_numbers - 1; i >= 0; i--) {
1576                 MonoDebugLineNumberEntry lne = jit->line_numbers [i];
1577
1578                 if (lne.native_offset <= native_offset)
1579                         return lne.il_offset;
1580         }
1581
1582         return -1;
1583 }
1584
1585 static int max_special_addr_diff = 0;
1586
1587 static inline void
1588 emit_advance_op (MonoDwarfWriter *w, int line_diff, int addr_diff)
1589 {
1590         gint64 opcode = 0;
1591
1592         /* Use a special opcode if possible */
1593         if (line_diff - LINE_BASE >= 0 && line_diff - LINE_BASE < LINE_RANGE) {
1594                 if (max_special_addr_diff == 0)
1595                         max_special_addr_diff = (255 - OPCODE_BASE) / LINE_RANGE;
1596
1597                 if (addr_diff > max_special_addr_diff && (addr_diff < 2 * max_special_addr_diff)) {
1598                         emit_byte (w, DW_LNS_const_add_pc);
1599                         addr_diff -= max_special_addr_diff;
1600                 }
1601
1602                 opcode = (line_diff - LINE_BASE) + (LINE_RANGE * addr_diff) + OPCODE_BASE;
1603                 if (opcode > 255)
1604                         opcode = 0;
1605         }
1606
1607         if (opcode != 0) {
1608                 emit_byte (w, opcode);
1609         } else {
1610                 //printf ("large: %d %d %d\n", line_diff, addr_diff, max_special_addr_diff);
1611                 emit_byte (w, DW_LNS_advance_line);
1612                 emit_sleb128 (w, line_diff);
1613                 emit_byte (w, DW_LNS_advance_pc);
1614                 emit_sleb128 (w, addr_diff);
1615                 emit_byte (w, DW_LNS_copy);
1616         }
1617 }
1618
1619 static gint
1620 compare_lne (MonoDebugLineNumberEntry *a, MonoDebugLineNumberEntry *b)
1621 {
1622         if (a->native_offset == b->native_offset)
1623                 return a->il_offset - b->il_offset;
1624         else
1625                 return a->native_offset - b->native_offset;
1626 }
1627
1628 static void
1629 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
1630                                            char *start_symbol, char *end_symbol,
1631                                            guint8 *code, guint32 code_size,
1632                                            MonoDebugMethodJitInfo *debug_info)
1633 {
1634         guint32 prev_line = 0;
1635         guint32 prev_native_offset = 0;
1636         int i, file_index, il_offset, prev_il_offset;
1637         gboolean first = TRUE;
1638         MonoDebugSourceLocation *loc;
1639         char *prev_file_name = NULL;
1640         MonoMethodHeader *header = mono_method_get_header (method);
1641         MonoDebugMethodInfo *minfo;
1642         MonoDebugLineNumberEntry *ln_array;
1643         int *native_to_il_offset = NULL;
1644
1645         if (!w->emit_line) {
1646                 mono_metadata_free_mh (header);
1647                 return;
1648         }
1649
1650         minfo = mono_debug_lookup_method (method);
1651
1652         /* Compute the native->IL offset mapping */
1653
1654         g_assert (code_size);
1655
1656         ln_array = g_new0 (MonoDebugLineNumberEntry, debug_info->num_line_numbers);
1657         memcpy (ln_array, debug_info->line_numbers, debug_info->num_line_numbers * sizeof (MonoDebugLineNumberEntry));
1658
1659         qsort (ln_array, debug_info->num_line_numbers, sizeof (MonoDebugLineNumberEntry), (gpointer)compare_lne);
1660
1661         native_to_il_offset = g_new0 (int, code_size + 1);
1662
1663         for (i = 0; i < debug_info->num_line_numbers; ++i) {
1664                 int j;
1665                 MonoDebugLineNumberEntry *lne = &ln_array [i];
1666
1667                 if (i == 0) {
1668                         for (j = 0; j < lne->native_offset; ++j)
1669                                 native_to_il_offset [j] = -1;
1670                 }
1671
1672                 if (i < debug_info->num_line_numbers - 1) {
1673                         MonoDebugLineNumberEntry *lne_next = &ln_array [i + 1];
1674
1675                         for (j = lne->native_offset; j < lne_next->native_offset; ++j)
1676                                 native_to_il_offset [j] = lne->il_offset;
1677                 } else {
1678                         for (j = lne->native_offset; j < code_size; ++j)
1679                                 native_to_il_offset [j] = lne->il_offset;
1680                 }
1681         }
1682         g_free (ln_array);
1683
1684         prev_line = 1;
1685         prev_il_offset = -1;
1686
1687         for (i = 0; i < code_size; ++i) {
1688                 int line_diff, addr_diff;
1689
1690                 if (!minfo)
1691                         continue;
1692
1693                 if (!debug_info->line_numbers)
1694                         continue;
1695
1696                 if (native_to_il_offset)
1697                         il_offset = native_to_il_offset [i];
1698                 else
1699                         il_offset = il_offset_from_address (method, debug_info, i);
1700                 /*
1701                 il_offset = il_offset_from_address (method, debug_info, i);
1702
1703                 g_assert (il_offset == native_to_il_offset [i]);
1704                 */
1705
1706                 il_offset = native_to_il_offset [i];
1707                 if (il_offset < 0)
1708                         continue;
1709
1710                 if (il_offset == prev_il_offset)
1711                         continue;
1712
1713                 prev_il_offset = il_offset;
1714
1715                 loc = mono_debug_symfile_lookup_location (minfo, il_offset);
1716                 if (!(loc && loc->source_file))
1717                         continue;
1718
1719                 line_diff = (gint32)loc->row - (gint32)prev_line;
1720                 addr_diff = i - prev_native_offset;
1721
1722                 if (first) {
1723                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1724
1725                         emit_byte (w, 0);
1726                         emit_byte (w, sizeof (gpointer) + 1);
1727                         emit_byte (w, DW_LNE_set_address);
1728                         if (start_symbol)
1729                                 emit_pointer_unaligned (w, start_symbol);
1730                         else
1731                                 emit_pointer_value (w, code);
1732
1733                         /*
1734                          * The prolog+initlocals region does not have a line number, this
1735                          * makes them belong to the first line of the method.
1736                          */
1737                         emit_byte (w, DW_LNS_advance_line);
1738                         //printf ("FIRST: %d %d %d\n", prev_line, loc->row, il_offset);
1739                         emit_sleb128 (w, (gint32)loc->row - (gint32)prev_line);
1740                         prev_line = loc->row;
1741                         prev_native_offset = i;
1742                         first = FALSE;
1743                 }
1744
1745                 if (loc->row != prev_line) {
1746                         if (!prev_file_name || strcmp (loc->source_file, prev_file_name) != 0) {
1747                                 /* Add an entry to the file table */
1748                                 /* FIXME: Avoid duplicates */
1749                                 if (w->collect_line_info)
1750                                         file_index = get_line_number_file_name (w, loc->source_file) + 1;
1751                                 else
1752                                         file_index = emit_line_number_file_name (w, loc->source_file, 0, 0);
1753                                 g_free (prev_file_name);
1754                                 prev_file_name = g_strdup (loc->source_file);
1755
1756                                 if (w->cur_file_index != file_index) {
1757                                         emit_byte (w, DW_LNS_set_file);
1758                                         emit_uleb128 (w, file_index);
1759                                         emit_byte (w, DW_LNS_copy);
1760                                         w->cur_file_index = file_index;
1761                                 }
1762                         }
1763                         //printf ("X: %p(+0x%x) %d %s:%d(+%d)\n", code + i, addr_diff, loc->il_offset, loc->source_file, loc->row, line_diff);
1764                         emit_advance_op (w, line_diff, addr_diff);
1765
1766                         prev_line = loc->row;
1767                         prev_native_offset = i;
1768                 }
1769
1770                 mono_debug_symfile_free_location (loc);
1771         }
1772
1773         g_free (native_to_il_offset);
1774         g_free (prev_file_name);
1775
1776         if (!first) {
1777                 emit_byte (w, DW_LNS_advance_pc);
1778                 emit_sleb128 (w, code_size - prev_native_offset);
1779                 emit_byte (w, DW_LNS_copy);
1780
1781                 emit_byte (w, 0);
1782                 emit_byte (w, 1);
1783                 emit_byte (w, DW_LNE_end_sequence);
1784         } else if (!start_symbol) {
1785                 /* No debug info, XDEBUG mode */
1786                 char *name, *dis;
1787                 const guint8 *ip = header->code;
1788                 int prev_line, prev_native_offset;
1789                 int *il_to_line;
1790
1791                 /*
1792                  * Emit the IL code into a temporary file and emit line number info
1793                  * referencing that file.
1794                  */
1795
1796                 name = mono_method_full_name (method, TRUE);
1797                 fprintf (w->il_file, "// %s\n", name);
1798                 w->il_file_line_index ++;
1799                 g_free (name);
1800
1801                 il_to_line = g_new0 (int, header->code_size);
1802
1803                 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1804                 emit_byte (w, 0);
1805                 emit_byte (w, sizeof (gpointer) + 1);
1806                 emit_byte (w, DW_LNE_set_address);
1807                 emit_pointer_value (w, code);
1808
1809                 // FIXME: Optimize this
1810                 while (ip < header->code + header->code_size) {
1811                         int il_offset = ip - header->code;
1812
1813                         /* Emit IL */
1814                         w->il_file_line_index ++;
1815
1816                         dis = disasm_ins (method, ip, &ip);
1817                         fprintf (w->il_file, "%s\n", dis);
1818                         g_free (dis);
1819
1820                         il_to_line [il_offset] = w->il_file_line_index;
1821                 }
1822
1823                 /* Emit line number info */
1824                 prev_line = 1;
1825                 prev_native_offset = 0;
1826                 for (i = 0; i < debug_info->num_line_numbers; ++i) {
1827                         MonoDebugLineNumberEntry *lne = &debug_info->line_numbers [i];
1828                         int line;
1829
1830                         if (lne->il_offset >= header->code_size)
1831                                 continue;
1832                         line = il_to_line [lne->il_offset];
1833                         if (!line) {
1834                                 /*
1835                                  * This seems to happen randomly, it looks like il_offset points
1836                                  * into the middle of an instruction.
1837                                  */
1838                                 continue;
1839                                 /*
1840                                 printf ("%s\n", mono_method_full_name (method, TRUE));
1841                                 printf ("%d %d\n", lne->il_offset, header->code_size);
1842                                 g_assert (line);
1843                                 */
1844                         }
1845
1846                         if (line - prev_line != 0) {
1847                                 emit_advance_op (w, line - prev_line, (gint32)lne->native_offset - prev_native_offset);
1848
1849                                 prev_line = line;
1850                                 prev_native_offset = lne->native_offset;
1851                         }
1852                 }
1853
1854                 emit_byte (w, DW_LNS_advance_pc);
1855                 emit_sleb128 (w, code_size - prev_native_offset);
1856                 emit_byte (w, DW_LNS_copy);
1857
1858                 emit_byte (w, 0);
1859                 emit_byte (w, 1);
1860                 emit_byte (w, DW_LNE_end_sequence);
1861
1862                 fflush (w->il_file);
1863                 g_free (il_to_line);
1864         }
1865         mono_metadata_free_mh (header);
1866 }
1867
1868 static MonoMethodVar*
1869 find_vmv (MonoCompile *cfg, MonoInst *ins)
1870 {
1871         int j;
1872
1873         if (cfg->varinfo) {
1874                 for (j = 0; j < cfg->num_varinfo; ++j) {
1875                         if (cfg->varinfo [j] == ins)
1876                                 break;
1877                 }
1878
1879                 if (j < cfg->num_varinfo) {
1880                         return MONO_VARINFO (cfg, j);
1881                 }
1882         }
1883
1884         return NULL;
1885 }
1886
1887 void
1888 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)
1889 {
1890         char *name;
1891         MonoMethodSignature *sig;
1892         MonoMethodHeader *header;
1893         char **names;
1894         MonoDebugLocalsInfo *locals_info;
1895         int i;
1896         guint8 buf [128];
1897         guint8 *p;
1898
1899         emit_section_change (w, ".debug_info", 0);
1900
1901         sig = mono_method_signature (method);
1902         header = mono_method_get_header (method);
1903
1904         /* Parameter types */
1905         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1906                 MonoType *t;
1907
1908                 if (i == 0 && sig->hasthis) {
1909                         if (method->klass->valuetype)
1910                                 t = &method->klass->this_arg;
1911                         else
1912                                 t = &method->klass->byval_arg;
1913                 } else {
1914                         t = sig->params [i - sig->hasthis];
1915                 }
1916
1917                 emit_type (w, t);
1918         }
1919         //emit_type (w, &mono_defaults.int32_class->byval_arg);
1920
1921         /* Local types */
1922         for (i = 0; i < header->num_locals; ++i) {
1923                 emit_type (w, header->locals [i]);
1924         }
1925
1926         /* Subprogram */
1927         names = g_new0 (char *, sig->param_count);
1928         mono_method_get_param_names (method, (const char **) names);
1929
1930         emit_uleb128 (w, ABBREV_SUBPROGRAM);
1931         name = mono_method_full_name (method, FALSE);
1932         emit_string (w, name);
1933 #ifndef TARGET_IOS
1934         emit_string (w, name);
1935 #endif
1936         g_free (name);
1937         if (start_symbol) {
1938                 emit_pointer_unaligned (w, start_symbol);
1939                 emit_pointer_unaligned (w, end_symbol);
1940         } else {
1941                 emit_pointer_value (w, code);
1942                 emit_pointer_value (w, code + code_size);
1943         }
1944         /* frame_base */
1945         emit_byte (w, 2);
1946         emit_byte (w, DW_OP_breg6);
1947         emit_byte (w, 16);
1948
1949         /* Parameters */
1950         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1951                 MonoInst *arg = args ? args [i] : NULL;
1952                 MonoType *t;
1953                 const char *pname;
1954                 char pname_buf [128];
1955                 MonoMethodVar *vmv = NULL;
1956                 gboolean need_loclist = FALSE;
1957
1958                 vmv = find_vmv (cfg, arg);
1959                 if (code && vmv && (vmv->live_range_start || vmv->live_range_end))
1960                         need_loclist = TRUE;
1961
1962                 if (i == 0 && sig->hasthis) {
1963                         if (method->klass->valuetype)
1964                                 t = &method->klass->this_arg;
1965                         else
1966                                 t = &method->klass->byval_arg;
1967                         pname = "this";
1968                 } else {
1969                         t = sig->params [i - sig->hasthis];
1970                         pname = names [i - sig->hasthis];
1971                 }
1972
1973                 emit_uleb128 (w, need_loclist ? ABBREV_PARAM_LOCLIST : ABBREV_PARAM);
1974                 /* name */
1975                 if (pname[0] == '\0') {
1976                         sprintf (pname_buf, "param%d", i - sig->hasthis);
1977                         pname = pname_buf;
1978                 }
1979                 emit_string (w, pname);
1980                 /* type */
1981                 if (!arg || arg->flags & MONO_INST_IS_DEAD)
1982                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1983                 else
1984                         emit_var_type (w, t);
1985
1986                 p = buf;
1987                 encode_var_location (w, arg, p, &p);
1988                 if (need_loclist) {
1989                         vmv->live_range_start = 0;
1990                         if (vmv->live_range_end == 0)
1991                                 /* FIXME: Uses made in calls are not recorded */
1992                                 vmv->live_range_end = code_size;
1993                         emit_loclist (w, arg, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
1994                 } else {
1995                         emit_byte (w, p - buf);
1996                         emit_bytes (w, buf, p - buf);
1997                 }
1998         }
1999         g_free (names);
2000
2001         /* Locals */
2002         locals_info = mono_debug_lookup_locals (method);
2003
2004         for (i = 0; i < header->num_locals; ++i) {
2005                 MonoInst *ins = locals [i];
2006                 char name_buf [128];
2007                 int j;
2008                 MonoMethodVar *vmv = NULL;
2009                 gboolean need_loclist = FALSE;
2010                 char *lname;
2011
2012                 /* ins->dreg no longer contains the original vreg */
2013                 vmv = find_vmv (cfg, ins);
2014                 if (code && vmv) {
2015                         if (vmv->live_range_start) {
2016                                 /* This variable has a precise live range */
2017                                 need_loclist = TRUE;
2018                         }
2019                 }
2020
2021                 emit_uleb128 (w, need_loclist ? ABBREV_VARIABLE_LOCLIST : ABBREV_VARIABLE);
2022                 /* name */
2023                 lname = NULL;
2024                 if (locals_info) {
2025                         for (j = 0; j < locals_info->num_locals; ++j)
2026                                 if (locals_info->locals [j].index == i)
2027                                         break;
2028                         if (j < locals_info->num_locals)
2029                                 lname = locals_info->locals [j].name;
2030                 }
2031                 if (lname) {
2032                         emit_string (w, lname);
2033                 } else {
2034                         sprintf (name_buf, "V_%d", i);
2035                         emit_string (w, name_buf);
2036                 }
2037                 /* type */
2038                 if (!ins || ins->flags & MONO_INST_IS_DEAD)
2039                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
2040                 else
2041                         emit_var_type (w, header->locals [i]);
2042
2043                 p = buf;
2044                 encode_var_location (w, ins, p, &p);
2045
2046                 if (need_loclist) {
2047                         if (vmv->live_range_end == 0)
2048                                 /* FIXME: Uses made in calls are not recorded */
2049                                 vmv->live_range_end = code_size;
2050                         emit_loclist (w, ins, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
2051                 } else {
2052                         emit_byte (w, p - buf);
2053                         emit_bytes (w, buf, p - buf);
2054                 }
2055         }
2056
2057         if (locals_info)
2058                 mono_debug_symfile_free_locals (locals_info);
2059
2060         /* Subprogram end */
2061         emit_uleb128 (w, 0x0);
2062
2063         emit_line (w);
2064
2065         emit_debug_info_end (w);
2066
2067         /* Emit unwind info */
2068         if (unwind_info) {
2069                 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, TRUE);
2070                 w->fde_index ++;
2071         }
2072
2073         /* Emit line number info */
2074         /* != could happen when using --regression */
2075         if (debug_info && (debug_info->code_start == code)) {
2076                 if (w->collect_line_info) {
2077                         MethodLineNumberInfo *info;
2078
2079                         /* Save the information needed to emit the line number info later at once */
2080                         info = g_new0 (MethodLineNumberInfo, 1);
2081                         info->method = method;
2082                         info->start_symbol = g_strdup (start_symbol);
2083                         info->end_symbol = g_strdup (end_symbol);
2084                         info->code = code;
2085                         info->code_size = code_size;
2086                         info->debug_info = debug_info;
2087                         w->line_info = g_slist_prepend (w->line_info, info);
2088                 } else {
2089                         emit_line_number_info (w, method, start_symbol, end_symbol, code, code_size, debug_info);
2090                 }
2091         }
2092
2093         emit_line (w);
2094         mono_metadata_free_mh (header);
2095 }
2096
2097 void
2098 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)
2099 {
2100         emit_section_change (w, ".debug_info", 0);
2101
2102         /* Subprogram */
2103         emit_uleb128 (w, ABBREV_TRAMP_SUBPROGRAM);
2104         emit_string (w, tramp_name);
2105         emit_pointer_value (w, code);
2106         emit_pointer_value (w, code + code_size);
2107
2108         /* Subprogram end */
2109         emit_uleb128 (w, 0x0);
2110
2111         emit_debug_info_end (w);
2112
2113         /* Emit unwind info */
2114         emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, FALSE);
2115         w->fde_index ++;
2116 }
2117 #endif /* End of: !defined(DISABLE_AOT) && !defined(DISABLE_JIT) */