mono/mini/dwarfwriter.c

   1 /*
   2  * dwarfwriter.c: Creation of DWARF debug information
   3  *
   4  * Author:
   5  *   Zoltan Varga (vargaz@gmail.com)
   6  *
   7  * (C) 2008-2009 Novell, Inc.
   8  */
   9
  10 #include "config.h"
  11
  12 #if !defined(DISABLE_AOT) && !defined(DISABLE_JIT)
  13 #include "dwarfwriter.h"
  14
  15 #include <sys/types.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #ifdef HAVE_STDINT_H
  19 #include <stdint.h>
  20 #endif
  21
  22 #include <mono/metadata/mono-endian.h>
  23 #include <mono/metadata/debug-mono-symfile.h>
  24 #include <mono/utils/mono-compiler.h>
  25
  26 #ifndef HOST_WIN32
  27 #include <mono/utils/freebsd-elf32.h>
  28 #include <mono/utils/freebsd-elf64.h>
  29 #endif
  30
  31 #include <mono/utils/freebsd-dwarf.h>
  32
  33 typedef struct {
  34         MonoMethod *method;
  35         char *start_symbol, *end_symbol;
  36         guint8 *code;
  37         guint32 code_size;
  38 } MethodLineNumberInfo;
  39
  40 struct _MonoDwarfWriter
  41 {
  42         MonoImageWriter *w;
  43         GHashTable *class_to_die, *class_to_vtype_die, *class_to_pointer_die;
  44         GHashTable *class_to_reference_die;
  45         int fde_index, tdie_index, line_number_file_index, line_number_dir_index;
  46         GHashTable *file_to_index, *index_to_file, *dir_to_index;
  47         FILE *il_file;
  48         int il_file_line_index, loclist_index;
  49         GSList *cie_program;
  50         FILE *fp;
  51         const char *temp_prefix;
  52         gboolean emit_line, appending, collect_line_info;
  53         GSList *line_info;
  54         int cur_file_index;
  55 };
  56
  57 static void
  58 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
  59                                            char *start_symbol, char *end_symbol,
  60                                            guint8 *code, guint32 code_size,
  61                                            MonoDebugMethodJitInfo *debug_info);
  62
  63 /*
  64  * mono_dwarf_writer_create:
  65  *
  66  *   Create a DWARF writer object. WRITER is the underlying image writer this
  67  * writer will emit to. IL_FILE is the file where IL code will be dumped to for
  68  * methods which have no line number info. It can be NULL.
  69  * If APPENDING is TRUE, the output file will be in assembleable state after each
  70  * call to the _emit_ functions. This is used for XDEBUG. If APPENDING is FALSE,
  71  * a separate mono_dwarf_writer_close () call is needed to finish the emission of
  72  * debug information.
  73  */
  74 MonoDwarfWriter*
  75 mono_dwarf_writer_create (MonoImageWriter *writer, FILE *il_file, int il_file_start_line, gboolean appending, gboolean emit_line_numbers)
  76 {
  77         MonoDwarfWriter *w = g_new0 (MonoDwarfWriter, 1);
  78
  79         /*
  80          * The appending flag is needed because we use subsections to order things in
  81          * the debug info, and:
  82          * - apple's assembler doesn't support them
  83          * - the binary writer has problems with subsections+alignment
  84          * So instead of subsections, we use the _close () function in AOT mode,
  85          * which writes out things in order.
  86          */
  87
  88         w->w = writer;
  89         w->il_file = il_file;
  90         w->il_file_line_index = il_file_start_line;
  91         w->appending = appending;
  92
  93         if (appending)
  94                 g_assert (img_writer_subsections_supported (w->w));
  95
  96         w->emit_line = TRUE;
  97
  98         if (appending) {
  99                 if (!img_writer_subsections_supported (w->w))
 100                         /* Can't emit line number info without subsections */
 101                         w->emit_line = FALSE;
 102         } else {
 103                 /* Collect line number info and emit it at once */
 104                 w->collect_line_info = TRUE;
 105         }
 106
 107         if (!emit_line_numbers) {
 108                 w->emit_line = FALSE;
 109                 w->collect_line_info = FALSE;
 110         }
 111
 112         w->fp = img_writer_get_fp (w->w);
 113         w->temp_prefix = img_writer_get_temp_label_prefix (w->w);
 114
 115         w->class_to_die = g_hash_table_new (NULL, NULL);
 116         w->class_to_vtype_die = g_hash_table_new (NULL, NULL);
 117         w->class_to_pointer_die = g_hash_table_new (NULL, NULL);
 118         w->class_to_reference_die = g_hash_table_new (NULL, NULL);
 119         w->cur_file_index = -1;
 120
 121         return w;
 122 }
 123
 124 void
 125 mono_dwarf_writer_destroy (MonoDwarfWriter *w)
 126 {
 127         g_free (w);
 128 }
 129
 130 int
 131 mono_dwarf_writer_get_il_file_line_index (MonoDwarfWriter *w)
 132 {
 133         return w->il_file_line_index;
 134 }
 135
 136 /* Wrappers around the image writer functions */
 137
 138 static inline void
 139 emit_section_change (MonoDwarfWriter *w, const char *section_name, int subsection_index)
 140 {
 141         img_writer_emit_section_change (w->w, section_name, subsection_index);
 142 }
 143
 144 static inline void
 145 emit_push_section (MonoDwarfWriter *w, const char *section_name, int subsection)
 146 {
 147         img_writer_emit_push_section (w->w, section_name, subsection);
 148 }
 149
 150 static inline void
 151 emit_pop_section (MonoDwarfWriter *w)
 152 {
 153         img_writer_emit_pop_section (w->w);
 154 }
 155
 156 static inline void
 157 emit_local_symbol (MonoDwarfWriter *w, const char *name, const char *end_label, gboolean func)
 158 {
 159         img_writer_emit_local_symbol (w->w, name, end_label, func);
 160 }
 161
 162 static inline void
 163 emit_label (MonoDwarfWriter *w, const char *name)
 164 {
 165         img_writer_emit_label (w->w, name);
 166 }
 167
 168 static inline void
 169 emit_bytes (MonoDwarfWriter *w, const guint8* buf, int size)
 170 {
 171         img_writer_emit_bytes (w->w, buf, size);
 172 }
 173
 174 static inline void
 175 emit_string (MonoDwarfWriter *w, const char *value)
 176 {
 177         img_writer_emit_string (w->w, value);
 178 }
 179
 180 static inline void
 181 emit_line (MonoDwarfWriter *w)
 182 {
 183         img_writer_emit_line (w->w);
 184 }
 185
 186 static inline void
 187 emit_alignment (MonoDwarfWriter *w, int size)
 188 {
 189         img_writer_emit_alignment (w->w, size);
 190 }
 191
 192 static inline void
 193 emit_pointer_unaligned (MonoDwarfWriter *w, const char *target)
 194 {
 195         img_writer_emit_pointer_unaligned (w->w, target);
 196 }
 197
 198 static inline void
 199 emit_pointer (MonoDwarfWriter *w, const char *target)
 200 {
 201         img_writer_emit_pointer (w->w, target);
 202 }
 203
 204 static inline void
 205 emit_int16 (MonoDwarfWriter *w, int value)
 206 {
 207         img_writer_emit_int16 (w->w, value);
 208 }
 209
 210 static inline void
 211 emit_int32 (MonoDwarfWriter *w, int value)
 212 {
 213         img_writer_emit_int32 (w->w, value);
 214 }
 215
 216 static inline void
 217 emit_symbol_diff (MonoDwarfWriter *w, const char *end, const char* start, int offset)
 218 {
 219         img_writer_emit_symbol_diff (w->w, end, start, offset);
 220 }
 221
 222 static inline void
 223 emit_zero_bytes (MonoDwarfWriter *w, int num)
 224 {
 225         img_writer_emit_zero_bytes (w->w, num);
 226 }
 227
 228 static inline void
 229 emit_byte (MonoDwarfWriter *w, guint8 val)
 230 {
 231         img_writer_emit_byte (w->w, val);
 232 }
 233
 234 static G_GNUC_UNUSED void
 235 emit_uleb128 (MonoDwarfWriter *w, guint32 value)
 236 {
 237         do {
 238                 guint8 b = value & 0x7f;
 239                 value >>= 7;
 240                 if (value != 0) /* more bytes to come */
 241                         b |= 0x80;
 242                 emit_byte (w, b);
 243         } while (value);
 244 }
 245
 246 static G_GNUC_UNUSED void
 247 emit_sleb128 (MonoDwarfWriter *w, gint64 value)
 248 {
 249         gboolean more = 1;
 250         gboolean negative = (value < 0);
 251         guint32 size = 64;
 252         guint8 byte;
 253
 254         while (more) {
 255                 byte = value & 0x7f;
 256                 value >>= 7;
 257                 /* the following is unnecessary if the
 258                  * implementation of >>= uses an arithmetic rather
 259                  * than logical shift for a signed left operand
 260                  */
 261                 if (negative)
 262                         /* sign extend */
 263                         value |= - ((gint64)1 <<(size - 7));
 264                 /* sign bit of byte is second high order bit (0x40) */
 265                 if ((value == 0 && !(byte & 0x40)) ||
 266                         (value == -1 && (byte & 0x40)))
 267                         more = 0;
 268                 else
 269                         byte |= 0x80;
 270                 emit_byte (w, byte);
 271         }
 272 }
 273
 274 static G_GNUC_UNUSED void
 275 encode_uleb128 (guint32 value, guint8 *buf, guint8 **endbuf)
 276 {
 277         guint8 *p = buf;
 278
 279         do {
 280                 guint8 b = value & 0x7f;
 281                 value >>= 7;
 282                 if (value != 0) /* more bytes to come */
 283                         b |= 0x80;
 284                 *p ++ = b;
 285         } while (value);
 286
 287         *endbuf = p;
 288 }
 289
 290 static G_GNUC_UNUSED void
 291 encode_sleb128 (gint32 value, guint8 *buf, guint8 **endbuf)
 292 {
 293         gboolean more = 1;
 294         gboolean negative = (value < 0);
 295         guint32 size = 32;
 296         guint8 byte;
 297         guint8 *p = buf;
 298
 299         while (more) {
 300                 byte = value & 0x7f;
 301                 value >>= 7;
 302                 /* the following is unnecessary if the
 303                  * implementation of >>= uses an arithmetic rather
 304                  * than logical shift for a signed left operand
 305                  */
 306                 if (negative)
 307                         /* sign extend */
 308                         value |= - (1 <<(size - 7));
 309                 /* sign bit of byte is second high order bit (0x40) */
 310                 if ((value == 0 && !(byte & 0x40)) ||
 311                         (value == -1 && (byte & 0x40)))
 312                         more = 0;
 313                 else
 314                         byte |= 0x80;
 315                 *p ++= byte;
 316         }
 317
 318         *endbuf = p;
 319 }
 320
 321 static void
 322 emit_dwarf_abbrev (MonoDwarfWriter *w, int code, int tag, gboolean has_child,
 323                                    int *attrs, int attrs_len)
 324 {
 325         int i;
 326
 327         emit_uleb128 (w, code);
 328         emit_uleb128 (w, tag);
 329         emit_byte (w, has_child);
 330
 331         for (i = 0; i < attrs_len; i++)
 332                 emit_uleb128 (w, attrs [i]);
 333         emit_uleb128 (w, 0);
 334         emit_uleb128 (w, 0);
 335 }
 336
 337 static void
 338 emit_cie (MonoDwarfWriter *w)
 339 {
 340         emit_section_change (w, ".debug_frame", 0);
 341
 342         emit_alignment (w, 8);
 343
 344         /* Emit a CIE */
 345         emit_symbol_diff (w, ".Lcie0_end", ".Lcie0_start", 0); /* length */
 346         emit_label (w, ".Lcie0_start");
 347         emit_int32 (w, 0xffffffff); /* CIE id */
 348         emit_byte (w, 3); /* version */
 349         emit_string (w, ""); /* augmention */
 350         emit_sleb128 (w, 1); /* code alignment factor */
 351         emit_sleb128 (w, mono_unwind_get_dwarf_data_align ()); /* data alignment factor */
 352         emit_uleb128 (w, mono_unwind_get_dwarf_pc_reg ());
 353
 354         w->cie_program = w->cie_program;
 355         if (w->cie_program) {
 356                 guint32 uw_info_len;
 357                 guint8 *uw_info = mono_unwind_ops_encode (w->cie_program, &uw_info_len);
 358                 emit_bytes (w, uw_info, uw_info_len);
 359                 g_free (uw_info);
 360         }
 361
 362         emit_alignment (w, sizeof (gpointer));
 363         emit_label (w, ".Lcie0_end");
 364 }
 365
 366 static void
 367 emit_pointer_value (MonoDwarfWriter *w, gpointer ptr)
 368 {
 369         gssize val = (gssize)ptr;
 370         emit_bytes (w, (guint8*)&val, sizeof (gpointer));
 371 }
 372
 373 static void
 374 emit_fde (MonoDwarfWriter *w, int fde_index, char *start_symbol, char *end_symbol,
 375                   guint8 *code, guint32 code_size, GSList *unwind_ops, gboolean use_cie)
 376 {
 377         char symbol1 [128];
 378         char symbol2 [128];
 379         GSList *l;
 380         guint8 *uw_info;
 381         guint32 uw_info_len;
 382
 383         emit_section_change (w, ".debug_frame", 0);
 384
 385         sprintf (symbol1, ".Lfde%d_start", fde_index);
 386         sprintf (symbol2, ".Lfde%d_end", fde_index);
 387         emit_symbol_diff (w, symbol2, symbol1, 0); /* length */
 388         emit_label (w, symbol1);
 389         emit_int32 (w, 0); /* CIE_pointer */
 390         if (start_symbol) {
 391                 emit_pointer (w, start_symbol); /* initial_location */
 392                 if (end_symbol)
 393                         emit_symbol_diff (w, end_symbol, start_symbol, 0); /* address_range */
 394                 else {
 395                         g_assert (code_size);
 396                         emit_int32 (w, code_size);
 397                 }
 398         } else {
 399                 emit_pointer_value (w, code);
 400                 emit_int32 (w, code_size);
 401         }
 402 #if SIZEOF_VOID_P == 8
 403         /* Upper 32 bits of code size */
 404         emit_int32 (w, 0);
 405 #endif
 406
 407         l = unwind_ops;
 408         if (w->cie_program) {
 409                 // FIXME: Check that the ops really begin with the CIE program */
 410                 int i;
 411
 412                 for (i = 0; i < g_slist_length (w->cie_program); ++i)
 413                         if (l)
 414                                 l = l->next;
 415         }
 416
 417         /* Convert the list of MonoUnwindOps to the format used by DWARF */
 418         uw_info = mono_unwind_ops_encode (l, &uw_info_len);
 419         emit_bytes (w, uw_info, uw_info_len);
 420         g_free (uw_info);
 421
 422         emit_alignment (w, sizeof (mgreg_t));
 423         emit_label (w, symbol2);
 424 }
 425
 426 /* Abbrevations */
 427 #define ABBREV_COMPILE_UNIT 1
 428 #define ABBREV_SUBPROGRAM 2
 429 #define ABBREV_PARAM 3
 430 #define ABBREV_BASE_TYPE 4
 431 #define ABBREV_STRUCT_TYPE 5
 432 #define ABBREV_DATA_MEMBER 6
 433 #define ABBREV_TYPEDEF 7
 434 #define ABBREV_ENUM_TYPE 8
 435 #define ABBREV_ENUMERATOR 9
 436 #define ABBREV_NAMESPACE 10
 437 #define ABBREV_VARIABLE 11
 438 #define ABBREV_VARIABLE_LOCLIST 12
 439 #define ABBREV_POINTER_TYPE 13
 440 #define ABBREV_REFERENCE_TYPE 14
 441 #define ABBREV_PARAM_LOCLIST 15
 442 #define ABBREV_INHERITANCE 16
 443 #define ABBREV_STRUCT_TYPE_NOCHILDREN 17
 444 #define ABBREV_TRAMP_SUBPROGRAM 18
 445
 446 static int compile_unit_attr [] = {
 447         DW_AT_producer     ,DW_FORM_string,
 448     DW_AT_name         ,DW_FORM_string,
 449     DW_AT_comp_dir     ,DW_FORM_string,
 450         DW_AT_language     ,DW_FORM_data1,
 451     DW_AT_low_pc       ,DW_FORM_addr,
 452     DW_AT_high_pc      ,DW_FORM_addr,
 453         DW_AT_stmt_list    ,DW_FORM_data4
 454 };
 455
 456 static int subprogram_attr [] = {
 457         DW_AT_name         , DW_FORM_string,
 458 #ifndef TARGET_IOS
 459         DW_AT_description  , DW_FORM_string,
 460 #endif
 461     DW_AT_low_pc       , DW_FORM_addr,
 462     DW_AT_high_pc      , DW_FORM_addr,
 463         DW_AT_frame_base   , DW_FORM_block1
 464 };
 465
 466 static int tramp_subprogram_attr [] = {
 467         DW_AT_name         , DW_FORM_string,
 468 #ifndef TARGET_IOS
 469         DW_AT_description  , DW_FORM_string,
 470 #endif
 471     DW_AT_low_pc       , DW_FORM_addr,
 472     DW_AT_high_pc      , DW_FORM_addr,
 473 };
 474
 475 static int param_attr [] = {
 476         DW_AT_name,     DW_FORM_string,
 477         DW_AT_type,     DW_FORM_ref4,
 478         DW_AT_location, DW_FORM_block1
 479 };
 480
 481 static int param_loclist_attr [] = {
 482         DW_AT_name,     DW_FORM_string,
 483         DW_AT_type,     DW_FORM_ref4,
 484         DW_AT_location, DW_FORM_data4
 485 };
 486
 487 static int base_type_attr [] = {
 488         DW_AT_byte_size,   DW_FORM_data1,
 489         DW_AT_encoding,    DW_FORM_data1,
 490         DW_AT_name,        DW_FORM_string
 491 };
 492
 493 static int struct_type_attr [] = {
 494         DW_AT_name,        DW_FORM_string,
 495         DW_AT_byte_size,   DW_FORM_udata,
 496 };
 497
 498 static int data_member_attr [] = {
 499         DW_AT_name,        DW_FORM_string,
 500         DW_AT_type,        DW_FORM_ref4,
 501         DW_AT_data_member_location, DW_FORM_block1
 502 };
 503
 504 static int typedef_attr [] = {
 505         DW_AT_name,        DW_FORM_string,
 506         DW_AT_type,        DW_FORM_ref4
 507 };
 508
 509 static int pointer_type_attr [] = {
 510         DW_AT_type,        DW_FORM_ref4,
 511 };
 512
 513 static int reference_type_attr [] = {
 514         DW_AT_type,        DW_FORM_ref4,
 515 };
 516
 517 static int enum_type_attr [] = {
 518         DW_AT_name,        DW_FORM_string,
 519         DW_AT_byte_size,   DW_FORM_udata,
 520         DW_AT_type,        DW_FORM_ref4,
 521 };
 522
 523 static int enumerator_attr [] = {
 524         DW_AT_name,        DW_FORM_string,
 525         DW_AT_const_value, DW_FORM_sdata,
 526 };
 527
 528 static int namespace_attr [] = {
 529         DW_AT_name,        DW_FORM_string,
 530 };
 531
 532 static int variable_attr [] = {
 533         DW_AT_name,     DW_FORM_string,
 534         DW_AT_type,     DW_FORM_ref4,
 535         DW_AT_location, DW_FORM_block1
 536 };
 537
 538 static int variable_loclist_attr [] = {
 539         DW_AT_name,     DW_FORM_string,
 540         DW_AT_type,     DW_FORM_ref4,
 541         DW_AT_location, DW_FORM_data4
 542 };
 543
 544 static int inheritance_attr [] = {
 545         DW_AT_type,        DW_FORM_ref4,
 546         DW_AT_data_member_location, DW_FORM_block1
 547 };
 548
 549 typedef struct DwarfBasicType {
 550         const char *die_name, *name;
 551         int type;
 552         int size;
 553         int encoding;
 554 } DwarfBasicType;
 555
 556 static DwarfBasicType basic_types [] = {
 557         { ".LDIE_I1", "sbyte", MONO_TYPE_I1, 1, DW_ATE_signed },
 558         { ".LDIE_U1", "byte", MONO_TYPE_U1, 1, DW_ATE_unsigned },
 559         { ".LDIE_I2", "short", MONO_TYPE_I2, 2, DW_ATE_signed },
 560         { ".LDIE_U2", "ushort", MONO_TYPE_U2, 2, DW_ATE_unsigned },
 561         { ".LDIE_I4", "int", MONO_TYPE_I4, 4, DW_ATE_signed },
 562         { ".LDIE_U4", "uint", MONO_TYPE_U4, 4, DW_ATE_unsigned },
 563         { ".LDIE_I8", "long", MONO_TYPE_I8, 8, DW_ATE_signed },
 564         { ".LDIE_U8", "ulong", MONO_TYPE_U8, 8, DW_ATE_unsigned },
 565         { ".LDIE_I", "intptr", MONO_TYPE_I, SIZEOF_VOID_P, DW_ATE_signed },
 566         { ".LDIE_U", "uintptr", MONO_TYPE_U, SIZEOF_VOID_P, DW_ATE_unsigned },
 567         { ".LDIE_R4", "float", MONO_TYPE_R4, 4, DW_ATE_float },
 568         { ".LDIE_R8", "double", MONO_TYPE_R8, 8, DW_ATE_float },
 569         { ".LDIE_BOOLEAN", "boolean", MONO_TYPE_BOOLEAN, 1, DW_ATE_boolean },
 570         { ".LDIE_CHAR", "char", MONO_TYPE_CHAR, 2, DW_ATE_unsigned_char },
 571         { ".LDIE_STRING", "string", MONO_TYPE_STRING, sizeof (gpointer), DW_ATE_address },
 572         { ".LDIE_OBJECT", "object", MONO_TYPE_OBJECT, sizeof (gpointer), DW_ATE_address },
 573         { ".LDIE_SZARRAY", "object", MONO_TYPE_SZARRAY, sizeof (gpointer), DW_ATE_address },
 574 };
 575
 576 /* Constants for encoding line number special opcodes */
 577 #define OPCODE_BASE 13
 578 #define LINE_BASE -5
 579 #define LINE_RANGE 14
 580
 581 /* Subsections of the .debug_line section */
 582 #define LINE_SUBSECTION_HEADER 1
 583 #define LINE_SUBSECTION_INCLUDES 2
 584 #define LINE_SUBSECTION_FILES 3
 585 #define LINE_SUBSECTION_DATA 4
 586 #define LINE_SUBSECTION_END 5
 587
 588 static int
 589 emit_line_number_file_name (MonoDwarfWriter *w, const char *name,
 590                                                         gint64 last_mod_time, gint64 file_size)
 591 {
 592         int index;
 593         int dir_index;
 594         char *basename = NULL;
 595
 596         if (!w->file_to_index)
 597                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 598
 599         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 600         if (index > 0)
 601                 return index;
 602
 603         if (g_path_is_absolute (name)) {
 604                 char *dir = g_path_get_dirname (name);
 605
 606                 if (!w->dir_to_index)
 607                         w->dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 608
 609                 dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (w->dir_to_index, dir));
 610                 if (dir_index == 0) {
 611                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 612                         emit_string (w, dir);
 613
 614                         dir_index = ++ w->line_number_dir_index;
 615                         g_hash_table_insert (w->dir_to_index, g_strdup (dir), GUINT_TO_POINTER (dir_index));
 616                 }
 617
 618                 g_free (dir);
 619
 620                 basename = g_path_get_basename (name);
 621         } else {
 622                 dir_index = 0;
 623         }
 624
 625         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 626
 627         if (basename)
 628                 emit_string (w, basename);
 629         else
 630                 emit_string (w, name);
 631         emit_uleb128 (w, dir_index);
 632         emit_byte (w, 0);
 633         emit_byte (w, 0);
 634
 635         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 636
 637         if (basename)
 638                 g_free (basename);
 639
 640         index = ++ w->line_number_file_index;
 641         g_hash_table_insert (w->file_to_index, g_strdup (name), GUINT_TO_POINTER (index));
 642
 643         return index;
 644 }
 645
 646 static int
 647 get_line_number_file_name (MonoDwarfWriter *w, const char *name)
 648 {
 649         int index;
 650
 651         g_assert (w->file_to_index);
 652         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 653         g_assert (index > 0);
 654         return index - 1;
 655 }
 656
 657 static int
 658 add_line_number_file_name (MonoDwarfWriter *w, const char *name,
 659                                                    gint64 last_mod_time, gint64 file_size)
 660 {
 661         int index;
 662         char *copy;
 663
 664         if (!w->file_to_index) {
 665                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 666                 w->index_to_file = g_hash_table_new (NULL, NULL);
 667         }
 668
 669         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 670         if (index > 0)
 671                 return index - 1;
 672         index = w->line_number_file_index;
 673         w->line_number_file_index ++;
 674         copy = g_strdup (name);
 675         g_hash_table_insert (w->file_to_index, copy, GUINT_TO_POINTER (index + 1));
 676         g_hash_table_insert (w->index_to_file, GUINT_TO_POINTER (index + 1), copy);
 677
 678         return index;
 679 }
 680
 681 static void
 682 emit_line_number_info_begin (MonoDwarfWriter *w)
 683 {
 684         /* Line number info header */
 685         /*
 686          * GAS seems to emit its own data to the end of the first subsection, so we use
 687          * subsections 1, 2 etc:
 688          * 1 - contains the header
 689          * 2 - contains the file names
 690          * 3 - contains the end of the header + the data
 691          * 4 - the end symbol
 692          */
 693         emit_section_change (w, ".debug_line", 0);
 694         emit_label (w, ".Ldebug_line_section_start");
 695         emit_section_change (w, ".debug_line", LINE_SUBSECTION_HEADER);
 696         emit_label (w, ".Ldebug_line_start");
 697         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 698         emit_int16 (w, 0x2); /* version */
 699         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 700         emit_byte (w, 1); /* minimum_instruction_length */
 701         emit_byte (w, 1); /* default_is_stmt */
 702         emit_byte (w, LINE_BASE); /* line_base */
 703         emit_byte (w, LINE_RANGE); /* line_range */
 704         emit_byte (w, OPCODE_BASE); /* opcode_base */
 705         emit_byte (w, 0); /* standard_opcode_lengths */
 706         emit_byte (w, 1);
 707         emit_byte (w, 1);
 708         emit_byte (w, 1);
 709         emit_byte (w, 1);
 710         emit_byte (w, 0);
 711         emit_byte (w, 0);
 712         emit_byte (w, 0);
 713         emit_byte (w, 1);
 714         emit_byte (w, 0);
 715         emit_byte (w, 0);
 716         emit_byte (w, 1);
 717
 718         /* Includes */
 719         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 720
 721         /* End of Includes */
 722         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 723         emit_byte (w, 0);
 724
 725         /* Files */
 726         emit_line_number_file_name (w, "xdb.il", 0, 0);
 727
 728         /* End of Files */
 729         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 730         emit_byte (w, 0);
 731
 732         emit_label (w, ".Ldebug_line_header_end");
 733
 734         /* Emit this into a separate subsection so it gets placed at the end */
 735         emit_section_change (w, ".debug_line", LINE_SUBSECTION_END);
 736
 737         emit_byte (w, 0);
 738         emit_byte (w, 1);
 739         emit_byte (w, DW_LNE_end_sequence);
 740
 741         emit_label (w, ".Ldebug_line_end");
 742 }
 743
 744 char *
 745 mono_dwarf_escape_path (const char *name)
 746 {
 747         if (strchr (name, '\\')) {
 748                 char *s;
 749                 int len, i, j;
 750
 751                 len = strlen (name);
 752                 s = g_malloc0 ((len + 1) * 2);
 753                 j = 0;
 754                 for (i = 0; i < len; ++i) {
 755                         if (name [i] == '\\') {
 756                                 s [j ++] = '\\';
 757                                 s [j ++] = '\\';
 758                         } else {
 759                                 s [j ++] = name [i];
 760                         }
 761                 }
 762                 return s;
 763         }
 764         return g_strdup (name);
 765 }
 766
 767 static void
 768 emit_all_line_number_info (MonoDwarfWriter *w)
 769 {
 770         int i;
 771         GHashTable *dir_to_index, *index_to_dir;
 772         GSList *l;
 773         GSList *info_list;
 774
 775         g_assert (w->collect_line_info);
 776
 777         add_line_number_file_name (w, "<unknown>", 0, 0);
 778
 779         /* Collect files */
 780         info_list = g_slist_reverse (w->line_info);
 781         for (l = info_list; l; l = l->next) {
 782                 MethodLineNumberInfo *info = l->data;
 783                 MonoDebugMethodInfo *minfo;
 784                 char *source_file;
 785                 GPtrArray *source_file_list;
 786
 787                 // FIXME: Free stuff
 788                 minfo = mono_debug_lookup_method (info->method);
 789                 if (!minfo)
 790                         continue;
 791
 792                 mono_debug_symfile_get_line_numbers_full (minfo, &source_file, &source_file_list, NULL, NULL, NULL, NULL, NULL);
 793                 for (i = 0; i < source_file_list->len; ++i) {
 794                         MonoDebugSourceInfo *sinfo = g_ptr_array_index (source_file_list, i);
 795                         add_line_number_file_name (w, sinfo->source_file, 0, 0);
 796                 }
 797         }
 798
 799         /* Preprocess files */
 800         dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 801         index_to_dir = g_hash_table_new (NULL, NULL);
 802         for (i = 0; i < w->line_number_file_index; ++i) {
 803                 char *name = g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 804                 char *copy;
 805                 int dir_index = 0;
 806
 807                 if (g_path_is_absolute (name)) {
 808                         char *dir = g_path_get_dirname (name);
 809
 810                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 811                         if (dir_index == 0) {
 812                                 dir_index = w->line_number_dir_index;
 813                                 w->line_number_dir_index ++;
 814                                 copy = g_strdup (dir);
 815                                 g_hash_table_insert (dir_to_index, copy, GUINT_TO_POINTER (dir_index + 1));
 816                                 g_hash_table_insert (index_to_dir, GUINT_TO_POINTER (dir_index + 1), copy);
 817                         } else {
 818                                 dir_index --;
 819                         }
 820
 821                         g_free (dir);
 822                 }
 823         }
 824
 825         /* Line number info header */
 826         emit_section_change (w, ".debug_line", 0);
 827         emit_label (w, ".Ldebug_line_section_start");
 828         emit_label (w, ".Ldebug_line_start");
 829         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 830         emit_int16 (w, 0x2); /* version */
 831         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 832         emit_byte (w, 1); /* minimum_instruction_length */
 833         emit_byte (w, 1); /* default_is_stmt */
 834         emit_byte (w, LINE_BASE); /* line_base */
 835         emit_byte (w, LINE_RANGE); /* line_range */
 836         emit_byte (w, OPCODE_BASE); /* opcode_base */
 837         emit_byte (w, 0); /* standard_opcode_lengths */
 838         emit_byte (w, 1);
 839         emit_byte (w, 1);
 840         emit_byte (w, 1);
 841         emit_byte (w, 1);
 842         emit_byte (w, 0);
 843         emit_byte (w, 0);
 844         emit_byte (w, 0);
 845         emit_byte (w, 1);
 846         emit_byte (w, 0);
 847         emit_byte (w, 0);
 848         emit_byte (w, 1);
 849
 850         /* Includes */
 851         emit_section_change (w, ".debug_line", 0);
 852         for (i = 0; i < w->line_number_dir_index; ++i) {
 853                 char *dir = g_hash_table_lookup (index_to_dir, GUINT_TO_POINTER (i + 1));
 854
 855                 emit_string (w, mono_dwarf_escape_path (dir));
 856         }
 857         /* End of Includes */
 858         emit_byte (w, 0);
 859
 860         /* Files */
 861         for (i = 0; i < w->line_number_file_index; ++i) {
 862                 char *name = g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 863                 char *basename = NULL, *dir;
 864                 int dir_index = 0;
 865
 866                 if (g_path_is_absolute (name)) {
 867                         dir = g_path_get_dirname (name);
 868
 869                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 870                         basename = g_path_get_basename (name);
 871                 }
 872
 873                 if (basename)
 874                         emit_string (w, basename);
 875                 else
 876                         emit_string (w, mono_dwarf_escape_path (name));
 877                 emit_uleb128 (w, dir_index);
 878                 emit_byte (w, 0);
 879                 emit_byte (w, 0);
 880         }
 881
 882         /* End of Files */
 883         emit_byte (w, 0);
 884
 885         emit_label (w, ".Ldebug_line_header_end");
 886
 887         /* Emit line number table */
 888         for (l = info_list; l; l = l->next) {
 889                 MethodLineNumberInfo *info = l->data;
 890                 MonoDebugMethodJitInfo *dmji;
 891
 892                 dmji = mono_debug_find_method (info->method, mono_domain_get ());;
 893                 emit_line_number_info (w, info->method, info->start_symbol, info->end_symbol, info->code, info->code_size, dmji);
 894                 mono_debug_free_method_jit_info (dmji);
 895         }
 896         g_slist_free (info_list);
 897
 898         emit_byte (w, 0);
 899         emit_byte (w, 1);
 900         emit_byte (w, DW_LNE_end_sequence);
 901
 902         emit_label (w, ".Ldebug_line_end");
 903 }
 904
 905 /*
 906  * Some assemblers like apple's do not support subsections, so we can't place
 907  * .Ldebug_info_end at the end of the section using subsections. Instead, we
 908  * define it every time something gets added to the .debug_info section.
 909  * The apple assember seems to use the last definition.
 910  */
 911 static void
 912 emit_debug_info_end (MonoDwarfWriter *w)
 913 {
 914         /* This doesn't seem to work/required with recent iphone sdk versions */
 915 #if 0
 916         if (!img_writer_subsections_supported (w->w))
 917                 fprintf (w->fp, "\n.set %sdebug_info_end,.\n", w->temp_prefix);
 918 #endif
 919 }
 920
 921 void
 922 mono_dwarf_writer_emit_base_info (MonoDwarfWriter *w, GSList *base_unwind_program)
 923 {
 924         char *s, *build_info;
 925         int i;
 926
 927         w->cie_program = base_unwind_program;
 928
 929         emit_section_change (w, ".debug_abbrev", 0);
 930         emit_dwarf_abbrev (w, ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, TRUE,
 931                                            compile_unit_attr, G_N_ELEMENTS (compile_unit_attr));
 932         emit_dwarf_abbrev (w, ABBREV_SUBPROGRAM, DW_TAG_subprogram, TRUE,
 933                                            subprogram_attr, G_N_ELEMENTS (subprogram_attr));
 934         emit_dwarf_abbrev (w, ABBREV_PARAM, DW_TAG_formal_parameter, FALSE,
 935                                            param_attr, G_N_ELEMENTS (param_attr));
 936         emit_dwarf_abbrev (w, ABBREV_PARAM_LOCLIST, DW_TAG_formal_parameter, FALSE,
 937                                            param_loclist_attr, G_N_ELEMENTS (param_loclist_attr));
 938         emit_dwarf_abbrev (w, ABBREV_BASE_TYPE, DW_TAG_base_type, FALSE,
 939                                            base_type_attr, G_N_ELEMENTS (base_type_attr));
 940         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE, DW_TAG_class_type, TRUE,
 941                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 942         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE_NOCHILDREN, DW_TAG_class_type, FALSE,
 943                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 944         emit_dwarf_abbrev (w, ABBREV_DATA_MEMBER, DW_TAG_member, FALSE,
 945                                            data_member_attr, G_N_ELEMENTS (data_member_attr));
 946         emit_dwarf_abbrev (w, ABBREV_TYPEDEF, DW_TAG_typedef, FALSE,
 947                                            typedef_attr, G_N_ELEMENTS (typedef_attr));
 948         emit_dwarf_abbrev (w, ABBREV_ENUM_TYPE, DW_TAG_enumeration_type, TRUE,
 949                                            enum_type_attr, G_N_ELEMENTS (enum_type_attr));
 950         emit_dwarf_abbrev (w, ABBREV_ENUMERATOR, DW_TAG_enumerator, FALSE,
 951                                            enumerator_attr, G_N_ELEMENTS (enumerator_attr));
 952         emit_dwarf_abbrev (w, ABBREV_NAMESPACE, DW_TAG_namespace, TRUE,
 953                                            namespace_attr, G_N_ELEMENTS (namespace_attr));
 954         emit_dwarf_abbrev (w, ABBREV_VARIABLE, DW_TAG_variable, FALSE,
 955                                            variable_attr, G_N_ELEMENTS (variable_attr));
 956         emit_dwarf_abbrev (w, ABBREV_VARIABLE_LOCLIST, DW_TAG_variable, FALSE,
 957                                            variable_loclist_attr, G_N_ELEMENTS (variable_loclist_attr));
 958         emit_dwarf_abbrev (w, ABBREV_POINTER_TYPE, DW_TAG_pointer_type, FALSE,
 959                                            pointer_type_attr, G_N_ELEMENTS (pointer_type_attr));
 960         emit_dwarf_abbrev (w, ABBREV_REFERENCE_TYPE, DW_TAG_reference_type, FALSE,
 961                                            reference_type_attr, G_N_ELEMENTS (reference_type_attr));
 962         emit_dwarf_abbrev (w, ABBREV_INHERITANCE, DW_TAG_inheritance, FALSE,
 963                                            inheritance_attr, G_N_ELEMENTS (inheritance_attr));
 964         emit_dwarf_abbrev (w, ABBREV_TRAMP_SUBPROGRAM, DW_TAG_subprogram, FALSE,
 965                                            tramp_subprogram_attr, G_N_ELEMENTS (tramp_subprogram_attr));
 966         emit_byte (w, 0);
 967
 968         emit_section_change (w, ".debug_info", 0);
 969         emit_label (w, ".Ldebug_info_start");
 970         emit_symbol_diff (w, ".Ldebug_info_end", ".Ldebug_info_begin", 0); /* length */
 971         emit_label (w, ".Ldebug_info_begin");
 972         emit_int16 (w, 0x2); /* DWARF version 2 */
 973         emit_int32 (w, 0); /* .debug_abbrev offset */
 974         emit_byte (w, sizeof (gpointer)); /* address size */
 975
 976         if (img_writer_subsections_supported (w->w) && w->appending) {
 977                 /* Emit this into a separate section so it gets placed at the end */
 978                 emit_section_change (w, ".debug_info", 1);
 979                 emit_byte (w, 0); /* close COMPILE_UNIT */
 980                 emit_label (w, ".Ldebug_info_end");
 981                 emit_section_change (w, ".debug_info", 0);
 982         }
 983
 984         /* Compilation unit */
 985         emit_uleb128 (w, ABBREV_COMPILE_UNIT);
 986         build_info = mono_get_runtime_build_info ();
 987         s = g_strdup_printf ("Mono AOT Compiler %s", build_info);
 988         emit_string (w, s);
 989         g_free (build_info);
 990         g_free (s);
 991         emit_string (w, "JITted code");
 992         emit_string (w, "");
 993         emit_byte (w, DW_LANG_C);
 994         emit_pointer_value (w, 0);
 995         emit_pointer_value (w, 0);
 996         /* offset into .debug_line section */
 997         emit_symbol_diff (w, ".Ldebug_line_start", ".Ldebug_line_section_start", 0);
 998
 999         /* Base types */
1000         for (i = 0; i < G_N_ELEMENTS (basic_types); ++i) {
1001                 emit_label (w, basic_types [i].die_name);
1002                 emit_uleb128 (w, ABBREV_BASE_TYPE);
1003                 emit_byte (w, basic_types [i].size);
1004                 emit_byte (w, basic_types [i].encoding);
1005                 emit_string (w, basic_types [i].name);
1006         }
1007
1008         emit_debug_info_end (w);
1009
1010         /* debug_loc section */
1011         emit_section_change (w, ".debug_loc", 0);
1012         emit_label (w, ".Ldebug_loc_start");
1013
1014         /* debug_line section */
1015         /*
1016          * We emit some info even if emit_line is FALSE, as the
1017          * apple linker seems to require a .debug_line section.
1018          */
1019         if (!w->collect_line_info)
1020                 emit_line_number_info_begin (w);
1021
1022         emit_cie (w);
1023 }
1024
1025 /*
1026  * mono_dwarf_writer_close:
1027  *
1028  *   Finalize the emitted debugging info.
1029  */
1030 void
1031 mono_dwarf_writer_close (MonoDwarfWriter *w)
1032 {
1033         if (!w->appending) {
1034                 emit_section_change (w, ".debug_info", 0);
1035                 emit_byte (w, 0); /* close COMPILE_UNIT */
1036                 emit_label (w, ".Ldebug_info_end");
1037         }
1038
1039         if (w->collect_line_info)
1040                 emit_all_line_number_info (w);
1041 }
1042
1043 static void emit_type (MonoDwarfWriter *w, MonoType *t);
1044 static const char* get_type_die (MonoDwarfWriter *w, MonoType *t);
1045
1046 static const char*
1047 get_class_die (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1048 {
1049         GHashTable *cache;
1050
1051         if (vtype)
1052                 cache = w->class_to_vtype_die;
1053         else
1054                 cache = w->class_to_die;
1055
1056         return g_hash_table_lookup (cache, klass);
1057 }
1058
1059 /* Returns the local symbol pointing to the emitted debug info */
1060 static char*
1061 emit_class_dwarf_info (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1062 {
1063         char *die, *pointer_die, *reference_die;
1064         char *full_name, *p;
1065         gpointer iter;
1066         MonoClassField *field;
1067         const char *fdie;
1068         int k;
1069         gboolean emit_namespace = FALSE, has_children;
1070         GHashTable *cache;
1071
1072         if (vtype)
1073                 cache = w->class_to_vtype_die;
1074         else
1075                 cache = w->class_to_die;
1076
1077         die = g_hash_table_lookup (cache, klass);
1078         if (die)
1079                 return die;
1080
1081         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) ||
1082                   (klass->byval_arg.type >= MONO_TYPE_BOOLEAN && klass->byval_arg.type <= MONO_TYPE_R8 && !vtype)))
1083                 return NULL;
1084
1085         /*
1086          * FIXME: gdb can't handle namespaces in languages it doesn't know about.
1087          */
1088         /*
1089         if (klass->name_space && klass->name_space [0] != '\0')
1090                 emit_namespace = TRUE;
1091         */
1092         if (emit_namespace) {
1093                 emit_uleb128 (w, ABBREV_NAMESPACE);
1094                 emit_string (w, klass->name_space);
1095         }
1096
1097         full_name = g_strdup_printf ("%s%s%s", klass->name_space, klass->name_space ? "." : "", klass->name);
1098         /*
1099          * gdb doesn't support namespaces for non-C++ dwarf objects, so use _
1100          * to separate components.
1101          */
1102         for (p = full_name; *p; p ++)
1103                 if (*p == '.')
1104                         *p = '_';
1105
1106         die = g_strdup_printf (".LTDIE_%d", w->tdie_index);
1107         pointer_die = g_strdup_printf (".LTDIE_%d_POINTER", w->tdie_index);
1108         reference_die = g_strdup_printf (".LTDIE_%d_REFERENCE", w->tdie_index);
1109         w->tdie_index ++;
1110
1111         g_hash_table_insert (w->class_to_pointer_die, klass, pointer_die);
1112         g_hash_table_insert (w->class_to_reference_die, klass, reference_die);
1113         g_hash_table_insert (cache, klass, die);
1114
1115         if (klass->enumtype) {
1116                 int size = mono_class_value_size (mono_class_from_mono_type (mono_class_enum_basetype (klass)), NULL);
1117
1118                 emit_label (w, die);
1119
1120                 emit_uleb128 (w, ABBREV_ENUM_TYPE);
1121                 emit_string (w, full_name);
1122                 emit_uleb128 (w, size);
1123                 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
1124                         if (basic_types [k].type == mono_class_enum_basetype (klass)->type)
1125                                 break;
1126                 g_assert (k < G_N_ELEMENTS (basic_types));
1127                 emit_symbol_diff (w, basic_types [k].die_name, ".Ldebug_info_start", 0);
1128
1129                 /* Emit enum values */
1130                 iter = NULL;
1131                 while ((field = mono_class_get_fields (klass, &iter))) {
1132                         const char *p;
1133                         int len;
1134                         MonoTypeEnum def_type;
1135
1136                         if (strcmp ("value__", mono_field_get_name (field)) == 0)
1137                                 continue;
1138                         if (mono_field_is_deleted (field))
1139                                 continue;
1140
1141                         emit_uleb128 (w, ABBREV_ENUMERATOR);
1142                         emit_string (w, mono_field_get_name (field));
1143
1144                         p = mono_class_get_field_default_value (field, &def_type);
1145                         len = mono_metadata_decode_blob_size (p, &p);
1146                         switch (mono_class_enum_basetype (klass)->type) {
1147                         case MONO_TYPE_U1:
1148                         case MONO_TYPE_I1:
1149                         case MONO_TYPE_BOOLEAN:
1150                                 emit_sleb128 (w, *p);
1151                                 break;
1152                         case MONO_TYPE_U2:
1153                         case MONO_TYPE_I2:
1154                         case MONO_TYPE_CHAR:
1155                                 emit_sleb128 (w, read16 (p));
1156                                 break;
1157                         case MONO_TYPE_U4:
1158                         case MONO_TYPE_I4:
1159                                 emit_sleb128 (w, read32 (p));
1160                                 break;
1161                         case MONO_TYPE_U8:
1162                         case MONO_TYPE_I8:
1163                                 emit_sleb128 (w, read64 (p));
1164                                 break;
1165                         case MONO_TYPE_I:
1166                         case MONO_TYPE_U:
1167 #if SIZEOF_VOID_P == 8
1168                                 emit_sleb128 (w, read64 (p));
1169 #else
1170                                 emit_sleb128 (w, read32 (p));
1171 #endif
1172                                 break;
1173                         default:
1174                                 g_assert_not_reached ();
1175                         }
1176                 }
1177
1178                 has_children = TRUE;
1179         } else {
1180                 guint8 buf [128];
1181                 guint8 *p;
1182                 char *parent_die;
1183
1184                 if (klass->parent)
1185                         parent_die = emit_class_dwarf_info (w, klass->parent, FALSE);
1186                 else
1187                         parent_die = NULL;
1188
1189                 /* Emit field types */
1190                 iter = NULL;
1191                 while ((field = mono_class_get_fields (klass, &iter))) {
1192                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1193                                 continue;
1194
1195                         emit_type (w, field->type);
1196                 }
1197
1198                 iter = NULL;
1199                 has_children = parent_die || mono_class_get_fields (klass, &iter);
1200
1201                 emit_label (w, die);
1202
1203                 emit_uleb128 (w, has_children ? ABBREV_STRUCT_TYPE : ABBREV_STRUCT_TYPE_NOCHILDREN);
1204                 emit_string (w, full_name);
1205                 emit_uleb128 (w, klass->instance_size);
1206
1207                 if (parent_die) {
1208                         emit_uleb128 (w, ABBREV_INHERITANCE);
1209                         emit_symbol_diff (w, parent_die, ".Ldebug_info_start", 0);
1210
1211                         p = buf;
1212                         *p ++= DW_OP_plus_uconst;
1213                         encode_uleb128 (0, p, &p);
1214                         emit_byte (w, p - buf);
1215                         emit_bytes (w, buf, p - buf);
1216                 }
1217
1218                 /* Emit fields */
1219                 iter = NULL;
1220                 while ((field = mono_class_get_fields (klass, &iter))) {
1221                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1222                                 continue;
1223
1224                         fdie = get_type_die (w, field->type);
1225                         if (fdie) {
1226                                 emit_uleb128 (w, ABBREV_DATA_MEMBER);
1227                                 emit_string (w, field->name);
1228                                 emit_symbol_diff (w, fdie, ".Ldebug_info_start", 0);
1229                                 /* location */
1230                                 p = buf;
1231                                 *p ++= DW_OP_plus_uconst;
1232                                 if (klass->valuetype && vtype)
1233                                         encode_uleb128 (field->offset - sizeof (MonoObject), p, &p);
1234                                 else
1235                                         encode_uleb128 (field->offset, p, &p);
1236
1237                                 emit_byte (w, p - buf);
1238                                 emit_bytes (w, buf, p - buf);
1239                         }
1240                 }
1241         }
1242
1243         /* Type end */
1244         if (has_children)
1245                 emit_uleb128 (w, 0x0);
1246
1247         /* Add a typedef, so we can reference the type without a 'struct' in gdb */
1248         emit_uleb128 (w, ABBREV_TYPEDEF);
1249         emit_string (w, full_name);
1250         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1251
1252         /* Add a pointer type */
1253         emit_label (w, pointer_die);
1254
1255         emit_uleb128 (w, ABBREV_POINTER_TYPE);
1256         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1257
1258         /* Add a reference type */
1259         emit_label (w, reference_die);
1260
1261         emit_uleb128 (w, ABBREV_REFERENCE_TYPE);
1262         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1263
1264         g_free (full_name);
1265
1266         if (emit_namespace) {
1267                 /* Namespace end */
1268                 emit_uleb128 (w, 0x0);
1269         }
1270
1271         return die;
1272 }
1273
1274 static gboolean base_types_emitted [64];
1275
1276 static const char*
1277 get_type_die (MonoDwarfWriter *w, MonoType *t)
1278 {
1279         MonoClass *klass = mono_class_from_mono_type (t);
1280         int j;
1281         const char *tdie;
1282
1283         if (t->byref) {
1284                 if (t->type == MONO_TYPE_VALUETYPE) {
1285                         tdie = g_hash_table_lookup (w->class_to_pointer_die, klass);
1286                 }
1287                 else {
1288                         tdie = get_class_die (w, klass, FALSE);
1289                         /* Should return a pointer type to a reference */
1290                 }
1291                 // FIXME:
1292                 t = &mono_defaults.int_class->byval_arg;
1293         }
1294         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1295                 if (basic_types [j].type == t->type)
1296                         break;
1297         if (j < G_N_ELEMENTS (basic_types)) {
1298                 tdie = basic_types [j].die_name;
1299         } else {
1300                 switch (t->type) {
1301                 case MONO_TYPE_CLASS:
1302                         tdie = g_hash_table_lookup (w->class_to_reference_die, klass);
1303                         //tdie = ".LDIE_OBJECT";
1304                         break;
1305                 case MONO_TYPE_ARRAY:
1306                         tdie = ".LDIE_OBJECT";
1307                         break;
1308                 case MONO_TYPE_VALUETYPE:
1309                         if (klass->enumtype)
1310                                 tdie = get_class_die (w, klass, FALSE);
1311                         else
1312                                 tdie = ".LDIE_I4";
1313                         break;
1314                 case MONO_TYPE_GENERICINST:
1315                         if (!MONO_TYPE_ISSTRUCT (t)) {
1316                                 tdie = g_hash_table_lookup (w->class_to_reference_die, klass);
1317                         } else {
1318                                 tdie = ".LDIE_I4";
1319                         }
1320                         break;
1321                 case MONO_TYPE_PTR:
1322                         tdie = ".LDIE_I";
1323                         break;
1324                 default:
1325                         tdie = ".LDIE_I4";
1326                         break;
1327                 }
1328         }
1329
1330         g_assert (tdie);
1331
1332         return tdie;
1333 }
1334
1335 static void
1336 emit_type (MonoDwarfWriter *w, MonoType *t)
1337 {
1338         MonoClass *klass = mono_class_from_mono_type (t);
1339         int j;
1340         const char *tdie;
1341
1342         if (t->byref) {
1343                 if (t->type == MONO_TYPE_VALUETYPE) {
1344                         tdie = emit_class_dwarf_info (w, klass, TRUE);
1345                         if (tdie)
1346                                 return;
1347                 }
1348                 else {
1349                         emit_class_dwarf_info (w, klass, FALSE);
1350                 }
1351                 // FIXME:
1352                 t = &mono_defaults.int_class->byval_arg;
1353         }
1354         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1355                 if (basic_types [j].type == t->type)
1356                         break;
1357         if (j < G_N_ELEMENTS (basic_types)) {
1358                 /* Emit a boxed version of base types */
1359                 if (j < 64 && !base_types_emitted [j]) {
1360                         emit_class_dwarf_info (w, klass, FALSE);
1361                         base_types_emitted [j] = TRUE;
1362                 }
1363         } else {
1364                 switch (t->type) {
1365                 case MONO_TYPE_CLASS:
1366                         emit_class_dwarf_info (w, klass, FALSE);
1367                         break;
1368                 case MONO_TYPE_ARRAY:
1369                         break;
1370                 case MONO_TYPE_VALUETYPE:
1371                         if (klass->enumtype)
1372                                 emit_class_dwarf_info (w, klass, FALSE);
1373                         break;
1374                 case MONO_TYPE_GENERICINST:
1375                         if (!MONO_TYPE_ISSTRUCT (t))
1376                                 emit_class_dwarf_info (w, klass, FALSE);
1377                         break;
1378                 case MONO_TYPE_PTR:
1379                         break;
1380                 default:
1381                         break;
1382                 }
1383         }
1384 }
1385
1386 static void
1387 emit_var_type (MonoDwarfWriter *w, MonoType *t)
1388 {
1389         const char *tdie;
1390
1391         tdie = get_type_die (w, t);
1392
1393         emit_symbol_diff (w, tdie, ".Ldebug_info_start", 0);
1394 }
1395
1396 static void
1397 encode_var_location (MonoDwarfWriter *w, MonoInst *ins, guint8 *p, guint8 **endp)
1398 {
1399         /* location */
1400         /* FIXME: This needs a location list, since the args can go from reg->stack */
1401         if (!ins || ins->flags & MONO_INST_IS_DEAD) {
1402                 /* gdb treats this as optimized out */
1403         } else if (ins->opcode == OP_REGVAR) {
1404                 *p = DW_OP_reg0 + mono_hw_reg_to_dwarf_reg (ins->dreg);
1405                 p ++;
1406         } else if (ins->opcode == OP_REGOFFSET) {
1407                 *p ++= DW_OP_breg0 + mono_hw_reg_to_dwarf_reg (ins->inst_basereg);
1408                 encode_sleb128 (ins->inst_offset, p, &p);
1409         } else {
1410                 // FIXME:
1411                 *p ++ = DW_OP_reg0;
1412         }
1413
1414         *endp = p;
1415 }
1416
1417 static void
1418 emit_loclist (MonoDwarfWriter *w, MonoInst *ins,
1419                           guint8 *loclist_begin_addr, guint8 *loclist_end_addr,
1420                           guint8 *expr, guint32 expr_len)
1421 {
1422         char label [128];
1423
1424         emit_push_section (w, ".debug_loc", 0);
1425         sprintf (label, ".Lloclist_%d", w->loclist_index ++ );
1426         emit_label (w, label);
1427
1428         emit_pointer_value (w, loclist_begin_addr);
1429         emit_pointer_value (w, loclist_end_addr);
1430         emit_byte (w, expr_len % 256);
1431         emit_byte (w, expr_len / 256);
1432         emit_bytes (w, expr, expr_len);
1433
1434         emit_pointer_value (w, NULL);
1435         emit_pointer_value (w, NULL);
1436
1437         emit_pop_section (w);
1438         emit_symbol_diff (w, label, ".Ldebug_loc_start", 0);
1439 }
1440
1441 /*
1442  * MonoDisHelper->tokener doesn't take an IP argument, and we can't add one since
1443  * it is a public header.
1444  */
1445 static const guint8 *token_handler_ip;
1446
1447 static char*
1448 token_handler (MonoDisHelper *dh, MonoMethod *method, guint32 token)
1449 {
1450         char *res, *desc;
1451         MonoMethod *cmethod;
1452         MonoClass *klass;
1453         MonoClassField *field;
1454         gpointer data = NULL;
1455
1456         if (method->wrapper_type)
1457                 data = mono_method_get_wrapper_data (method, token);
1458
1459         switch (*token_handler_ip) {
1460         case CEE_ISINST:
1461         case CEE_CASTCLASS:
1462         case CEE_LDELEMA:
1463                 if (method->wrapper_type)
1464                         klass = data;
1465                 else
1466                         klass = mono_class_get_full (method->klass->image, token, NULL);
1467                 res = g_strdup_printf ("<%s>", klass->name);
1468                 break;
1469         case CEE_NEWOBJ:
1470         case CEE_CALL:
1471         case CEE_CALLVIRT:
1472                 if (method->wrapper_type)
1473                         cmethod = data;
1474                 else
1475                         cmethod = mono_get_method_full (method->klass->image, token, NULL, NULL);
1476                 desc = mono_method_full_name (cmethod, TRUE);
1477                 res = g_strdup_printf ("<%s>", desc);
1478                 g_free (desc);
1479                 break;
1480         case CEE_CALLI:
1481                 if (method->wrapper_type) {
1482                         desc = mono_signature_get_desc (data, FALSE);
1483                         res = g_strdup_printf ("<%s>", desc);
1484                         g_free (desc);
1485                 } else {
1486                         res = g_strdup_printf ("<0x%08x>", token);
1487                 }
1488                 break;
1489         case CEE_LDFLD:
1490         case CEE_LDSFLD:
1491         case CEE_STFLD:
1492         case CEE_STSFLD:
1493                 if (method->wrapper_type)
1494                         field = data;
1495                 else
1496                         field = mono_field_from_token (method->klass->image, token, &klass, NULL);
1497                 desc = mono_field_full_name (field);
1498                 res = g_strdup_printf ("<%s>", desc);
1499                 g_free (desc);
1500                 break;
1501         default:
1502                 res = g_strdup_printf ("<0x%08x>", token);
1503                 break;
1504         }
1505
1506         return res;
1507 }
1508
1509 /*
1510  * disasm_ins:
1511  *
1512  *   Produce a disassembled form of the IL instruction at IP. This is an extension
1513  * of mono_disasm_code_one () which can disasm tokens, handle wrapper methods, and
1514  * CEE_MONO_ opcodes.
1515  */
1516 static char*
1517 disasm_ins (MonoMethod *method, const guchar *ip, const guint8 **endip)
1518 {
1519         char *dis;
1520         MonoDisHelper dh;
1521         MonoMethodHeader *header = mono_method_get_header (method);
1522
1523         memset (&dh, 0, sizeof (dh));
1524         dh.newline = "";
1525         dh.label_format = "IL_%04x: ";
1526         dh.label_target = "IL_%04x";
1527         dh.tokener = token_handler;
1528
1529         token_handler_ip = ip;
1530         if (*ip == MONO_CUSTOM_PREFIX) {
1531                 guint32 token;
1532                 gpointer data;
1533
1534                 switch (ip [1]) {
1535                 case CEE_MONO_ICALL: {
1536                         MonoJitICallInfo *info;
1537
1538                         token = read32 (ip + 2);
1539                         data = mono_method_get_wrapper_data (method, token);
1540                         info = mono_find_jit_icall_by_addr (data);
1541                         g_assert (info);
1542
1543                         dis = g_strdup_printf ("IL_%04x: mono_icall <%s>", (int)(ip - header->code), info->name);
1544                         ip += 6;
1545                         break;
1546                 }
1547                 case CEE_MONO_CLASSCONST: {
1548                         token = read32 (ip + 2);
1549                         data = mono_method_get_wrapper_data (method, token);
1550
1551                         dis = g_strdup_printf ("IL_%04x: mono_classconst <%s>", (int)(ip - header->code), ((MonoClass*)data)->name);
1552                         ip += 6;
1553                         break;
1554                 }
1555                 default:
1556                         dis = mono_disasm_code_one (&dh, method, ip, &ip);
1557                 }
1558         } else {
1559                 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1560         }
1561         token_handler_ip = NULL;
1562
1563         *endip = ip;
1564         mono_metadata_free_mh (header);
1565         return dis;
1566 }
1567
1568 static gint32
1569 il_offset_from_address (MonoMethod *method, MonoDebugMethodJitInfo *jit,
1570                                                 guint32 native_offset)
1571 {
1572         int i;
1573
1574         if (!jit->line_numbers)
1575                 return -1;
1576
1577         for (i = jit->num_line_numbers - 1; i >= 0; i--) {
1578                 MonoDebugLineNumberEntry lne = jit->line_numbers [i];
1579
1580                 if (lne.native_offset <= native_offset)
1581                         return lne.il_offset;
1582         }
1583
1584         return -1;
1585 }
1586
1587 static int max_special_addr_diff = 0;
1588
1589 static inline void
1590 emit_advance_op (MonoDwarfWriter *w, int line_diff, int addr_diff)
1591 {
1592         gint64 opcode = 0;
1593
1594         /* Use a special opcode if possible */
1595         if (line_diff - LINE_BASE >= 0 && line_diff - LINE_BASE < LINE_RANGE) {
1596                 if (max_special_addr_diff == 0)
1597                         max_special_addr_diff = (255 - OPCODE_BASE) / LINE_RANGE;
1598
1599                 if (addr_diff > max_special_addr_diff && (addr_diff < 2 * max_special_addr_diff)) {
1600                         emit_byte (w, DW_LNS_const_add_pc);
1601                         addr_diff -= max_special_addr_diff;
1602                 }
1603
1604                 opcode = (line_diff - LINE_BASE) + (LINE_RANGE * addr_diff) + OPCODE_BASE;
1605                 if (opcode > 255)
1606                         opcode = 0;
1607         }
1608
1609         if (opcode != 0) {
1610                 emit_byte (w, opcode);
1611         } else {
1612                 //printf ("large: %d %d %d\n", line_diff, addr_diff, max_special_addr_diff);
1613                 emit_byte (w, DW_LNS_advance_line);
1614                 emit_sleb128 (w, line_diff);
1615                 emit_byte (w, DW_LNS_advance_pc);
1616                 emit_sleb128 (w, addr_diff);
1617                 emit_byte (w, DW_LNS_copy);
1618         }
1619 }
1620
1621 static gint
1622 compare_lne (MonoDebugLineNumberEntry *a, MonoDebugLineNumberEntry *b)
1623 {
1624         if (a->native_offset == b->native_offset)
1625                 return a->il_offset - b->il_offset;
1626         else
1627                 return a->native_offset - b->native_offset;
1628 }
1629
1630 static void
1631 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
1632                                            char *start_symbol, char *end_symbol,
1633                                            guint8 *code, guint32 code_size,
1634                                            MonoDebugMethodJitInfo *debug_info)
1635 {
1636         guint32 prev_line = 0;
1637         guint32 prev_native_offset = 0;
1638         int i, file_index, il_offset, prev_il_offset;
1639         gboolean first = TRUE;
1640         MonoDebugSourceLocation *loc;
1641         char *prev_file_name = NULL;
1642         MonoMethodHeader *header = mono_method_get_header (method);
1643         MonoDebugMethodInfo *minfo;
1644         MonoDebugLineNumberEntry *ln_array;
1645         int *native_to_il_offset = NULL;
1646
1647         if (!w->emit_line) {
1648                 mono_metadata_free_mh (header);
1649                 return;
1650         }
1651
1652         minfo = mono_debug_lookup_method (method);
1653
1654         /* Compute the native->IL offset mapping */
1655
1656         g_assert (code_size);
1657
1658         ln_array = g_new0 (MonoDebugLineNumberEntry, debug_info->num_line_numbers);
1659         memcpy (ln_array, debug_info->line_numbers, debug_info->num_line_numbers * sizeof (MonoDebugLineNumberEntry));
1660
1661         qsort (ln_array, debug_info->num_line_numbers, sizeof (MonoDebugLineNumberEntry), (gpointer)compare_lne);
1662
1663         native_to_il_offset = g_new0 (int, code_size + 1);
1664
1665         for (i = 0; i < debug_info->num_line_numbers; ++i) {
1666                 int j;
1667                 MonoDebugLineNumberEntry *lne = &ln_array [i];
1668
1669                 if (i == 0) {
1670                         for (j = 0; j < lne->native_offset; ++j)
1671                                 native_to_il_offset [j] = -1;
1672                 }
1673
1674                 if (i < debug_info->num_line_numbers - 1) {
1675                         MonoDebugLineNumberEntry *lne_next = &ln_array [i + 1];
1676
1677                         for (j = lne->native_offset; j < lne_next->native_offset; ++j)
1678                                 native_to_il_offset [j] = lne->il_offset;
1679                 } else {
1680                         for (j = lne->native_offset; j < code_size; ++j)
1681                                 native_to_il_offset [j] = lne->il_offset;
1682                 }
1683         }
1684         g_free (ln_array);
1685
1686         prev_line = 1;
1687         prev_il_offset = -1;
1688
1689         for (i = 0; i < code_size; ++i) {
1690                 int line_diff, addr_diff;
1691
1692                 if (!minfo)
1693                         continue;
1694
1695                 if (!debug_info->line_numbers)
1696                         continue;
1697
1698                 if (native_to_il_offset)
1699                         il_offset = native_to_il_offset [i];
1700                 else
1701                         il_offset = il_offset_from_address (method, debug_info, i);
1702                 /*
1703                 il_offset = il_offset_from_address (method, debug_info, i);
1704
1705                 g_assert (il_offset == native_to_il_offset [i]);
1706                 */
1707
1708                 il_offset = native_to_il_offset [i];
1709                 if (il_offset < 0)
1710                         continue;
1711
1712                 if (il_offset == prev_il_offset)
1713                         continue;
1714
1715                 prev_il_offset = il_offset;
1716
1717                 loc = mono_debug_symfile_lookup_location (minfo, il_offset);
1718                 if (!(loc && loc->source_file))
1719                         continue;
1720
1721                 line_diff = (gint32)loc->row - (gint32)prev_line;
1722                 addr_diff = i - prev_native_offset;
1723
1724                 if (first) {
1725                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1726
1727                         emit_byte (w, 0);
1728                         emit_byte (w, sizeof (gpointer) + 1);
1729                         emit_byte (w, DW_LNE_set_address);
1730                         if (start_symbol)
1731                                 emit_pointer_unaligned (w, start_symbol);
1732                         else
1733                                 emit_pointer_value (w, code);
1734
1735                         /*
1736                          * The prolog+initlocals region does not have a line number, this
1737                          * makes them belong to the first line of the method.
1738                          */
1739                         emit_byte (w, DW_LNS_advance_line);
1740                         //printf ("FIRST: %d %d %d\n", prev_line, loc->row, il_offset);
1741                         emit_sleb128 (w, (gint32)loc->row - (gint32)prev_line);
1742                         prev_line = loc->row;
1743                         prev_native_offset = i;
1744                         first = FALSE;
1745                 }
1746
1747                 if (loc->row != prev_line) {
1748                         if (!prev_file_name || strcmp (loc->source_file, prev_file_name) != 0) {
1749                                 /* Add an entry to the file table */
1750                                 /* FIXME: Avoid duplicates */
1751                                 if (w->collect_line_info)
1752                                         file_index = get_line_number_file_name (w, loc->source_file) + 1;
1753                                 else
1754                                         file_index = emit_line_number_file_name (w, loc->source_file, 0, 0);
1755                                 g_free (prev_file_name);
1756                                 prev_file_name = g_strdup (loc->source_file);
1757
1758                                 if (w->cur_file_index != file_index) {
1759                                         emit_byte (w, DW_LNS_set_file);
1760                                         emit_uleb128 (w, file_index);
1761                                         emit_byte (w, DW_LNS_copy);
1762                                         w->cur_file_index = file_index;
1763                                 }
1764                         }
1765                         //printf ("X: %p(+0x%x) %d %s:%d(+%d)\n", code + i, addr_diff, loc->il_offset, loc->source_file, loc->row, line_diff);
1766                         emit_advance_op (w, line_diff, addr_diff);
1767
1768                         prev_line = loc->row;
1769                         prev_native_offset = i;
1770                 }
1771
1772                 mono_debug_symfile_free_location (loc);
1773         }
1774
1775         g_free (native_to_il_offset);
1776         g_free (prev_file_name);
1777
1778         if (!first) {
1779                 emit_byte (w, DW_LNS_advance_pc);
1780                 emit_sleb128 (w, code_size - prev_native_offset);
1781                 emit_byte (w, DW_LNS_copy);
1782
1783                 emit_byte (w, 0);
1784                 emit_byte (w, 1);
1785                 emit_byte (w, DW_LNE_end_sequence);
1786         } else if (!start_symbol) {
1787                 /* No debug info, XDEBUG mode */
1788                 char *name, *dis;
1789                 const guint8 *ip = header->code;
1790                 int prev_line, prev_native_offset;
1791                 int *il_to_line;
1792
1793                 /*
1794                  * Emit the IL code into a temporary file and emit line number info
1795                  * referencing that file.
1796                  */
1797
1798                 name = mono_method_full_name (method, TRUE);
1799                 fprintf (w->il_file, "// %s\n", name);
1800                 w->il_file_line_index ++;
1801                 g_free (name);
1802
1803                 il_to_line = g_new0 (int, header->code_size);
1804
1805                 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1806                 emit_byte (w, 0);
1807                 emit_byte (w, sizeof (gpointer) + 1);
1808                 emit_byte (w, DW_LNE_set_address);
1809                 emit_pointer_value (w, code);
1810
1811                 // FIXME: Optimize this
1812                 while (ip < header->code + header->code_size) {
1813                         int il_offset = ip - header->code;
1814
1815                         /* Emit IL */
1816                         w->il_file_line_index ++;
1817
1818                         dis = disasm_ins (method, ip, &ip);
1819                         fprintf (w->il_file, "%s\n", dis);
1820                         g_free (dis);
1821
1822                         il_to_line [il_offset] = w->il_file_line_index;
1823                 }
1824
1825                 /* Emit line number info */
1826                 prev_line = 1;
1827                 prev_native_offset = 0;
1828                 for (i = 0; i < debug_info->num_line_numbers; ++i) {
1829                         MonoDebugLineNumberEntry *lne = &debug_info->line_numbers [i];
1830                         int line;
1831
1832                         if (lne->il_offset >= header->code_size)
1833                                 continue;
1834                         line = il_to_line [lne->il_offset];
1835                         if (!line) {
1836                                 /*
1837                                  * This seems to happen randomly, it looks like il_offset points
1838                                  * into the middle of an instruction.
1839                                  */
1840                                 continue;
1841                                 /*
1842                                 printf ("%s\n", mono_method_full_name (method, TRUE));
1843                                 printf ("%d %d\n", lne->il_offset, header->code_size);
1844                                 g_assert (line);
1845                                 */
1846                         }
1847
1848                         if (line - prev_line != 0) {
1849                                 emit_advance_op (w, line - prev_line, (gint32)lne->native_offset - prev_native_offset);
1850
1851                                 prev_line = line;
1852                                 prev_native_offset = lne->native_offset;
1853                         }
1854                 }
1855
1856                 emit_byte (w, DW_LNS_advance_pc);
1857                 emit_sleb128 (w, code_size - prev_native_offset);
1858                 emit_byte (w, DW_LNS_copy);
1859
1860                 emit_byte (w, 0);
1861                 emit_byte (w, 1);
1862                 emit_byte (w, DW_LNE_end_sequence);
1863
1864                 fflush (w->il_file);
1865                 g_free (il_to_line);
1866         }
1867         mono_metadata_free_mh (header);
1868 }
1869
1870 static MonoMethodVar*
1871 find_vmv (MonoCompile *cfg, MonoInst *ins)
1872 {
1873         int j;
1874
1875         if (cfg->varinfo) {
1876                 for (j = 0; j < cfg->num_varinfo; ++j) {
1877                         if (cfg->varinfo [j] == ins)
1878                                 break;
1879                 }
1880
1881                 if (j < cfg->num_varinfo) {
1882                         return MONO_VARINFO (cfg, j);
1883                 }
1884         }
1885
1886         return NULL;
1887 }
1888
1889 void
1890 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)
1891 {
1892         char *name;
1893         MonoMethodSignature *sig;
1894         MonoMethodHeader *header;
1895         char **names;
1896         MonoDebugLocalsInfo *locals_info;
1897         int i;
1898         guint8 buf [128];
1899         guint8 *p;
1900
1901         emit_section_change (w, ".debug_info", 0);
1902
1903         sig = mono_method_signature (method);
1904         header = mono_method_get_header (method);
1905
1906         /* Parameter types */
1907         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1908                 MonoType *t;
1909
1910                 if (i == 0 && sig->hasthis) {
1911                         if (method->klass->valuetype)
1912                                 t = &method->klass->this_arg;
1913                         else
1914                                 t = &method->klass->byval_arg;
1915                 } else {
1916                         t = sig->params [i - sig->hasthis];
1917                 }
1918
1919                 emit_type (w, t);
1920         }
1921         //emit_type (w, &mono_defaults.int32_class->byval_arg);
1922
1923         /* Local types */
1924         for (i = 0; i < header->num_locals; ++i) {
1925                 emit_type (w, header->locals [i]);
1926         }
1927
1928         /* Subprogram */
1929         names = g_new0 (char *, sig->param_count);
1930         mono_method_get_param_names (method, (const char **) names);
1931
1932         emit_uleb128 (w, ABBREV_SUBPROGRAM);
1933         name = mono_method_full_name (method, FALSE);
1934         emit_string (w, name);
1935 #ifndef TARGET_IOS
1936         emit_string (w, name);
1937 #endif
1938         g_free (name);
1939         if (start_symbol) {
1940                 emit_pointer_unaligned (w, start_symbol);
1941                 emit_pointer_unaligned (w, end_symbol);
1942         } else {
1943                 emit_pointer_value (w, code);
1944                 emit_pointer_value (w, code + code_size);
1945         }
1946         /* frame_base */
1947         emit_byte (w, 2);
1948         emit_byte (w, DW_OP_breg6);
1949         emit_byte (w, 16);
1950
1951         /* Parameters */
1952         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1953                 MonoInst *arg = args ? args [i] : NULL;
1954                 MonoType *t;
1955                 const char *pname;
1956                 char pname_buf [128];
1957                 MonoMethodVar *vmv = NULL;
1958                 gboolean need_loclist = FALSE;
1959
1960                 vmv = find_vmv (cfg, arg);
1961                 if (code && vmv && (vmv->live_range_start || vmv->live_range_end))
1962                         need_loclist = TRUE;
1963
1964                 if (i == 0 && sig->hasthis) {
1965                         if (method->klass->valuetype)
1966                                 t = &method->klass->this_arg;
1967                         else
1968                                 t = &method->klass->byval_arg;
1969                         pname = "this";
1970                 } else {
1971                         t = sig->params [i - sig->hasthis];
1972                         pname = names [i - sig->hasthis];
1973                 }
1974
1975                 emit_uleb128 (w, need_loclist ? ABBREV_PARAM_LOCLIST : ABBREV_PARAM);
1976                 /* name */
1977                 if (pname[0] == '\0') {
1978                         sprintf (pname_buf, "param%d", i - sig->hasthis);
1979                         pname = pname_buf;
1980                 }
1981                 emit_string (w, pname);
1982                 /* type */
1983                 if (!arg || arg->flags & MONO_INST_IS_DEAD)
1984                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1985                 else
1986                         emit_var_type (w, t);
1987
1988                 p = buf;
1989                 encode_var_location (w, arg, p, &p);
1990                 if (need_loclist) {
1991                         vmv->live_range_start = 0;
1992                         if (vmv->live_range_end == 0)
1993                                 /* FIXME: Uses made in calls are not recorded */
1994                                 vmv->live_range_end = code_size;
1995                         emit_loclist (w, arg, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
1996                 } else {
1997                         emit_byte (w, p - buf);
1998                         emit_bytes (w, buf, p - buf);
1999                 }
2000         }
2001         g_free (names);
2002
2003         /* Locals */
2004         locals_info = mono_debug_lookup_locals (method);
2005
2006         for (i = 0; i < header->num_locals; ++i) {
2007                 MonoInst *ins = locals [i];
2008                 char name_buf [128];
2009                 int j;
2010                 MonoMethodVar *vmv = NULL;
2011                 gboolean need_loclist = FALSE;
2012                 char *lname;
2013
2014                 /* ins->dreg no longer contains the original vreg */
2015                 vmv = find_vmv (cfg, ins);
2016                 if (code && vmv) {
2017                         if (vmv->live_range_start) {
2018                                 /* This variable has a precise live range */
2019                                 need_loclist = TRUE;
2020                         }
2021                 }
2022
2023                 emit_uleb128 (w, need_loclist ? ABBREV_VARIABLE_LOCLIST : ABBREV_VARIABLE);
2024                 /* name */
2025                 lname = NULL;
2026                 if (locals_info) {
2027                         for (j = 0; j < locals_info->num_locals; ++j)
2028                                 if (locals_info->locals [j].index == i)
2029                                         break;
2030                         if (j < locals_info->num_locals)
2031                                 lname = locals_info->locals [j].name;
2032                 }
2033                 if (lname) {
2034                         emit_string (w, lname);
2035                 } else {
2036                         sprintf (name_buf, "V_%d", i);
2037                         emit_string (w, name_buf);
2038                 }
2039                 /* type */
2040                 if (!ins || ins->flags & MONO_INST_IS_DEAD)
2041                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
2042                 else
2043                         emit_var_type (w, header->locals [i]);
2044
2045                 p = buf;
2046                 encode_var_location (w, ins, p, &p);
2047
2048                 if (need_loclist) {
2049                         if (vmv->live_range_end == 0)
2050                                 /* FIXME: Uses made in calls are not recorded */
2051                                 vmv->live_range_end = code_size;
2052                         emit_loclist (w, ins, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
2053                 } else {
2054                         emit_byte (w, p - buf);
2055                         emit_bytes (w, buf, p - buf);
2056                 }
2057         }
2058
2059         if (locals_info)
2060                 mono_debug_symfile_free_locals (locals_info);
2061
2062         /* Subprogram end */
2063         emit_uleb128 (w, 0x0);
2064
2065         emit_line (w);
2066
2067         emit_debug_info_end (w);
2068
2069         /* Emit unwind info */
2070         if (unwind_info) {
2071                 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, TRUE);
2072                 w->fde_index ++;
2073         }
2074
2075         /* Emit line number info */
2076         /* != could happen when using --regression */
2077         if (debug_info && (debug_info->code_start == code)) {
2078                 if (w->collect_line_info) {
2079                         MethodLineNumberInfo *info;
2080
2081                         /* Save the information needed to emit the line number info later at once */
2082                         info = g_new0 (MethodLineNumberInfo, 1);
2083                         info->method = method;
2084                         info->start_symbol = g_strdup (start_symbol);
2085                         info->end_symbol = g_strdup (end_symbol);
2086                         info->code = code;
2087                         info->code_size = code_size;
2088                         w->line_info = g_slist_prepend (w->line_info, info);
2089                 } else {
2090                         emit_line_number_info (w, method, start_symbol, end_symbol, code, code_size, debug_info);
2091                 }
2092         }
2093
2094         emit_line (w);
2095         mono_metadata_free_mh (header);
2096 }
2097
2098 void
2099 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)
2100 {
2101         emit_section_change (w, ".debug_info", 0);
2102
2103         /* Subprogram */
2104         emit_uleb128 (w, ABBREV_TRAMP_SUBPROGRAM);
2105         emit_string (w, tramp_name);
2106         emit_pointer_value (w, code);
2107         emit_pointer_value (w, code + code_size);
2108
2109         /* Subprogram end */
2110         emit_uleb128 (w, 0x0);
2111
2112         emit_debug_info_end (w);
2113
2114         /* Emit unwind info */
2115         emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, FALSE);
2116         w->fde_index ++;
2117 }
2118 #endif /* End of: !defined(DISABLE_AOT) && !defined(DISABLE_JIT) */