mono/mini/dwarfwriter.c

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