mono/mini/dwarfwriter.c

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