mono/mini/dwarfwriter.c

   1 /*
   2  * dwarfwriter.c: Creation of DWARF debug information
   3  *
   4  * Author:
   5  *   Zoltan Varga (vargaz@gmail.com)
   6  *
   7  * (C) 2008-2009 Novell, Inc.
   8  */
   9
  10 #include "config.h"
  11
  12 #if !defined(DISABLE_AOT) && !defined(DISABLE_JIT)
  13 #include "dwarfwriter.h"
  14
  15 #include <sys/types.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #ifdef HAVE_STDINT_H
  19 #include <stdint.h>
  20 #endif
  21
  22 #include <mono/metadata/mono-endian.h>
  23 #include <mono/metadata/debug-mono-symfile.h>
  24 #include <mono/metadata/mono-debug-debugger.h>
  25 #include <mono/utils/mono-compiler.h>
  26
  27 #ifndef HOST_WIN32
  28 #include <mono/utils/freebsd-elf32.h>
  29 #include <mono/utils/freebsd-elf64.h>
  30 #endif
  31
  32 #include <mono/utils/freebsd-dwarf.h>
  33
  34 #define DW_AT_MIPS_linkage_name 0x2007
  35 #define DW_LNE_set_prologue_end 0x0a
  36
  37 typedef struct {
  38         MonoMethod *method;
  39         char *start_symbol, *end_symbol;
  40         guint8 *code;
  41         guint32 code_size;
  42 } MethodLineNumberInfo;
  43
  44 struct _MonoDwarfWriter
  45 {
  46         MonoImageWriter *w;
  47         GHashTable *class_to_die, *class_to_vtype_die, *class_to_pointer_die;
  48         GHashTable *class_to_reference_die;
  49         int fde_index, tdie_index, line_number_file_index, line_number_dir_index;
  50         GHashTable *file_to_index, *index_to_file, *dir_to_index;
  51         FILE *il_file;
  52         int il_file_line_index, loclist_index;
  53         GSList *cie_program;
  54         FILE *fp;
  55         const char *temp_prefix;
  56         gboolean emit_line, appending, collect_line_info;
  57         GSList *line_info;
  58         int cur_file_index;
  59 };
  60
  61 static void
  62 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
  63                                            char *start_symbol, char *end_symbol,
  64                                            guint8 *code, guint32 code_size,
  65                                            MonoDebugMethodJitInfo *debug_info);
  66
  67 /*
  68  * mono_dwarf_writer_create:
  69  *
  70  *   Create a DWARF writer object. WRITER is the underlying image writer this
  71  * writer will emit to. IL_FILE is the file where IL code will be dumped to for
  72  * methods which have no line number info. It can be NULL.
  73  * If APPENDING is TRUE, the output file will be in assembleable state after each
  74  * call to the _emit_ functions. This is used for XDEBUG. If APPENDING is FALSE,
  75  * a separate mono_dwarf_writer_close () call is needed to finish the emission of
  76  * debug information.
  77  */
  78 MonoDwarfWriter*
  79 mono_dwarf_writer_create (MonoImageWriter *writer, FILE *il_file, int il_file_start_line, gboolean appending, gboolean emit_line_numbers)
  80 {
  81         MonoDwarfWriter *w = g_new0 (MonoDwarfWriter, 1);
  82
  83         /*
  84          * The appending flag is needed because we use subsections to order things in
  85          * the debug info, and:
  86          * - apple's assembler doesn't support them
  87          * - the binary writer has problems with subsections+alignment
  88          * So instead of subsections, we use the _close () function in AOT mode,
  89          * which writes out things in order.
  90          */
  91
  92         w->w = writer;
  93         w->il_file = il_file;
  94         w->il_file_line_index = il_file_start_line;
  95         w->appending = appending;
  96
  97         if (appending)
  98                 g_assert (mono_img_writer_subsections_supported (w->w));
  99
 100         w->emit_line = TRUE;
 101
 102         if (appending) {
 103                 if (!mono_img_writer_subsections_supported (w->w))
 104                         /* Can't emit line number info without subsections */
 105                         w->emit_line = FALSE;
 106         } else {
 107                 /* Collect line number info and emit it at once */
 108                 w->collect_line_info = TRUE;
 109         }
 110
 111         if (!emit_line_numbers) {
 112                 w->emit_line = FALSE;
 113                 w->collect_line_info = FALSE;
 114         }
 115
 116         w->fp = mono_img_writer_get_fp (w->w);
 117         w->temp_prefix = mono_img_writer_get_temp_label_prefix (w->w);
 118
 119         w->class_to_die = g_hash_table_new (NULL, NULL);
 120         w->class_to_vtype_die = g_hash_table_new (NULL, NULL);
 121         w->class_to_pointer_die = g_hash_table_new (NULL, NULL);
 122         w->class_to_reference_die = g_hash_table_new (NULL, NULL);
 123         w->cur_file_index = -1;
 124
 125         return w;
 126 }
 127
 128 void
 129 mono_dwarf_writer_destroy (MonoDwarfWriter *w)
 130 {
 131         g_free (w);
 132 }
 133
 134 int
 135 mono_dwarf_writer_get_il_file_line_index (MonoDwarfWriter *w)
 136 {
 137         return w->il_file_line_index;
 138 }
 139
 140 /* Wrappers around the image writer functions */
 141
 142 static inline void
 143 emit_section_change (MonoDwarfWriter *w, const char *section_name, int subsection_index)
 144 {
 145         mono_img_writer_emit_section_change (w->w, section_name, subsection_index);
 146 }
 147
 148 static inline void
 149 emit_push_section (MonoDwarfWriter *w, const char *section_name, int subsection)
 150 {
 151         mono_img_writer_emit_push_section (w->w, section_name, subsection);
 152 }
 153
 154 static inline void
 155 emit_pop_section (MonoDwarfWriter *w)
 156 {
 157         mono_img_writer_emit_pop_section (w->w);
 158 }
 159
 160 static inline void
 161 emit_label (MonoDwarfWriter *w, const char *name)
 162 {
 163         mono_img_writer_emit_label (w->w, name);
 164 }
 165
 166 static inline void
 167 emit_bytes (MonoDwarfWriter *w, const guint8* buf, int size)
 168 {
 169         mono_img_writer_emit_bytes (w->w, buf, size);
 170 }
 171
 172 static inline void
 173 emit_string (MonoDwarfWriter *w, const char *value)
 174 {
 175         mono_img_writer_emit_string (w->w, value);
 176 }
 177
 178 static inline void
 179 emit_line (MonoDwarfWriter *w)
 180 {
 181         mono_img_writer_emit_line (w->w);
 182 }
 183
 184 static inline void
 185 emit_alignment (MonoDwarfWriter *w, int size)
 186 {
 187         mono_img_writer_emit_alignment (w->w, size);
 188 }
 189
 190 static inline void
 191 emit_pointer_unaligned (MonoDwarfWriter *w, const char *target)
 192 {
 193         mono_img_writer_emit_pointer_unaligned (w->w, target);
 194 }
 195
 196 static inline void
 197 emit_pointer (MonoDwarfWriter *w, const char *target)
 198 {
 199         mono_img_writer_emit_pointer (w->w, target);
 200 }
 201
 202 static inline void
 203 emit_int16 (MonoDwarfWriter *w, int value)
 204 {
 205         mono_img_writer_emit_int16 (w->w, value);
 206 }
 207
 208 static inline void
 209 emit_int32 (MonoDwarfWriter *w, int value)
 210 {
 211         mono_img_writer_emit_int32 (w->w, value);
 212 }
 213
 214 static inline void
 215 emit_symbol_diff (MonoDwarfWriter *w, const char *end, const char* start, int offset)
 216 {
 217         mono_img_writer_emit_symbol_diff (w->w, end, start, offset);
 218 }
 219
 220 static inline void
 221 emit_byte (MonoDwarfWriter *w, guint8 val)
 222 {
 223         mono_img_writer_emit_byte (w->w, val);
 224 }
 225
 226 static void
 227 emit_escaped_string (MonoDwarfWriter *w, char *value)
 228 {
 229         int i, len;
 230
 231         len = strlen (value);
 232         for (i = 0; i < len; ++i) {
 233                 char c = value [i];
 234                 if (!(isalnum (c))) {
 235                         switch (c) {
 236                         case '_':
 237                         case '-':
 238                         case ':':
 239                         case '.':
 240                         case ',':
 241                         case '/':
 242                         case '<':
 243                         case '>':
 244                         case '`':
 245                         case '(':
 246                         case ')':
 247                         case '[':
 248                         case ']':
 249                                 break;
 250                         default:
 251                                 value [i] = '_';
 252                                 break;
 253                         }
 254                 }
 255         }
 256         mono_img_writer_emit_string (w->w, value);
 257 }
 258
 259 static G_GNUC_UNUSED void
 260 emit_uleb128 (MonoDwarfWriter *w, guint32 value)
 261 {
 262         do {
 263                 guint8 b = value & 0x7f;
 264                 value >>= 7;
 265                 if (value != 0) /* more bytes to come */
 266                         b |= 0x80;
 267                 emit_byte (w, b);
 268         } while (value);
 269 }
 270
 271 static G_GNUC_UNUSED void
 272 emit_sleb128 (MonoDwarfWriter *w, gint64 value)
 273 {
 274         gboolean more = 1;
 275         gboolean negative = (value < 0);
 276         guint32 size = 64;
 277         guint8 byte;
 278
 279         while (more) {
 280                 byte = value & 0x7f;
 281                 value >>= 7;
 282                 /* the following is unnecessary if the
 283                  * implementation of >>= uses an arithmetic rather
 284                  * than logical shift for a signed left operand
 285                  */
 286                 if (negative)
 287                         /* sign extend */
 288                         value |= - ((gint64)1 <<(size - 7));
 289                 /* sign bit of byte is second high order bit (0x40) */
 290                 if ((value == 0 && !(byte & 0x40)) ||
 291                         (value == -1 && (byte & 0x40)))
 292                         more = 0;
 293                 else
 294                         byte |= 0x80;
 295                 emit_byte (w, byte);
 296         }
 297 }
 298
 299 static G_GNUC_UNUSED void
 300 encode_uleb128 (guint32 value, guint8 *buf, guint8 **endbuf)
 301 {
 302         guint8 *p = buf;
 303
 304         do {
 305                 guint8 b = value & 0x7f;
 306                 value >>= 7;
 307                 if (value != 0) /* more bytes to come */
 308                         b |= 0x80;
 309                 *p ++ = b;
 310         } while (value);
 311
 312         *endbuf = p;
 313 }
 314
 315 static G_GNUC_UNUSED void
 316 encode_sleb128 (gint32 value, guint8 *buf, guint8 **endbuf)
 317 {
 318         gboolean more = 1;
 319         gboolean negative = (value < 0);
 320         guint32 size = 32;
 321         guint8 byte;
 322         guint8 *p = buf;
 323
 324         while (more) {
 325                 byte = value & 0x7f;
 326                 value >>= 7;
 327                 /* the following is unnecessary if the
 328                  * implementation of >>= uses an arithmetic rather
 329                  * than logical shift for a signed left operand
 330                  */
 331                 if (negative)
 332                         /* sign extend */
 333                         value |= - (1 <<(size - 7));
 334                 /* sign bit of byte is second high order bit (0x40) */
 335                 if ((value == 0 && !(byte & 0x40)) ||
 336                         (value == -1 && (byte & 0x40)))
 337                         more = 0;
 338                 else
 339                         byte |= 0x80;
 340                 *p ++= byte;
 341         }
 342
 343         *endbuf = p;
 344 }
 345
 346 static void
 347 emit_dwarf_abbrev (MonoDwarfWriter *w, int code, int tag, gboolean has_child,
 348                                    int *attrs, int attrs_len)
 349 {
 350         int i;
 351
 352         emit_uleb128 (w, code);
 353         emit_uleb128 (w, tag);
 354         emit_byte (w, has_child);
 355
 356         for (i = 0; i < attrs_len; i++)
 357                 emit_uleb128 (w, attrs [i]);
 358         emit_uleb128 (w, 0);
 359         emit_uleb128 (w, 0);
 360 }
 361
 362 static void
 363 emit_cie (MonoDwarfWriter *w)
 364 {
 365         emit_section_change (w, ".debug_frame", 0);
 366
 367         emit_alignment (w, 8);
 368
 369         /* Emit a CIE */
 370         emit_symbol_diff (w, ".Lcie0_end", ".Lcie0_start", 0); /* length */
 371         emit_label (w, ".Lcie0_start");
 372         emit_int32 (w, 0xffffffff); /* CIE id */
 373         emit_byte (w, 3); /* version */
 374         emit_string (w, ""); /* augmention */
 375         emit_sleb128 (w, 1); /* code alignment factor */
 376         emit_sleb128 (w, mono_unwind_get_dwarf_data_align ()); /* data alignment factor */
 377         emit_uleb128 (w, mono_unwind_get_dwarf_pc_reg ());
 378
 379         w->cie_program = w->cie_program;
 380         if (w->cie_program) {
 381                 guint32 uw_info_len;
 382                 guint8 *uw_info = mono_unwind_ops_encode (w->cie_program, &uw_info_len);
 383                 emit_bytes (w, uw_info, uw_info_len);
 384                 g_free (uw_info);
 385         }
 386
 387         emit_alignment (w, sizeof (gpointer));
 388         emit_label (w, ".Lcie0_end");
 389 }
 390
 391 static void
 392 emit_pointer_value (MonoDwarfWriter *w, gpointer ptr)
 393 {
 394         gssize val = (gssize)ptr;
 395         emit_bytes (w, (guint8*)&val, sizeof (gpointer));
 396 }
 397
 398 static void
 399 emit_fde (MonoDwarfWriter *w, int fde_index, char *start_symbol, char *end_symbol,
 400                   guint8 *code, guint32 code_size, GSList *unwind_ops, gboolean use_cie)
 401 {
 402         char symbol1 [128];
 403         char symbol2 [128];
 404         GSList *l;
 405         guint8 *uw_info;
 406         guint32 uw_info_len;
 407
 408         emit_section_change (w, ".debug_frame", 0);
 409
 410         sprintf (symbol1, ".Lfde%d_start", fde_index);
 411         sprintf (symbol2, ".Lfde%d_end", fde_index);
 412         emit_symbol_diff (w, symbol2, symbol1, 0); /* length */
 413         emit_label (w, symbol1);
 414         emit_int32 (w, 0); /* CIE_pointer */
 415         if (start_symbol) {
 416                 emit_pointer (w, start_symbol); /* initial_location */
 417                 if (end_symbol)
 418                         emit_symbol_diff (w, end_symbol, start_symbol, 0); /* address_range */
 419                 else {
 420                         g_assert (code_size);
 421                         emit_int32 (w, code_size);
 422                 }
 423         } else {
 424                 emit_pointer_value (w, code);
 425                 emit_int32 (w, code_size);
 426         }
 427 #if SIZEOF_VOID_P == 8
 428         /* Upper 32 bits of code size */
 429         emit_int32 (w, 0);
 430 #endif
 431
 432         l = unwind_ops;
 433         if (w->cie_program) {
 434                 // FIXME: Check that the ops really begin with the CIE program */
 435                 int i;
 436
 437                 for (i = 0; i < g_slist_length (w->cie_program); ++i)
 438                         if (l)
 439                                 l = l->next;
 440         }
 441
 442         /* Convert the list of MonoUnwindOps to the format used by DWARF */
 443         uw_info = mono_unwind_ops_encode_full (l, &uw_info_len, FALSE);
 444         emit_bytes (w, uw_info, uw_info_len);
 445         g_free (uw_info);
 446
 447         emit_alignment (w, sizeof (mgreg_t));
 448         emit_label (w, symbol2);
 449 }
 450
 451 /* Abbrevations */
 452 #define ABBREV_COMPILE_UNIT 1
 453 #define ABBREV_SUBPROGRAM 2
 454 #define ABBREV_PARAM 3
 455 #define ABBREV_BASE_TYPE 4
 456 #define ABBREV_STRUCT_TYPE 5
 457 #define ABBREV_DATA_MEMBER 6
 458 #define ABBREV_TYPEDEF 7
 459 #define ABBREV_ENUM_TYPE 8
 460 #define ABBREV_ENUMERATOR 9
 461 #define ABBREV_NAMESPACE 10
 462 #define ABBREV_VARIABLE 11
 463 #define ABBREV_VARIABLE_LOCLIST 12
 464 #define ABBREV_POINTER_TYPE 13
 465 #define ABBREV_REFERENCE_TYPE 14
 466 #define ABBREV_PARAM_LOCLIST 15
 467 #define ABBREV_INHERITANCE 16
 468 #define ABBREV_STRUCT_TYPE_NOCHILDREN 17
 469 #define ABBREV_TRAMP_SUBPROGRAM 18
 470
 471 static int compile_unit_attr [] = {
 472         DW_AT_producer     ,DW_FORM_string,
 473     DW_AT_name         ,DW_FORM_string,
 474     DW_AT_comp_dir     ,DW_FORM_string,
 475         DW_AT_language     ,DW_FORM_data1,
 476     DW_AT_low_pc       ,DW_FORM_addr,
 477     DW_AT_high_pc      ,DW_FORM_addr,
 478         DW_AT_stmt_list    ,DW_FORM_data4
 479 };
 480
 481 static int subprogram_attr [] = {
 482         DW_AT_name         , DW_FORM_string,
 483         DW_AT_MIPS_linkage_name, DW_FORM_string,
 484         DW_AT_decl_file    , DW_FORM_udata,
 485         DW_AT_decl_line    , DW_FORM_udata,
 486 #ifndef TARGET_IOS
 487         DW_AT_description  , DW_FORM_string,
 488 #endif
 489     DW_AT_low_pc       , DW_FORM_addr,
 490     DW_AT_high_pc      , DW_FORM_addr,
 491         DW_AT_frame_base   , DW_FORM_block1
 492 };
 493
 494 static int tramp_subprogram_attr [] = {
 495         DW_AT_name         , DW_FORM_string,
 496     DW_AT_low_pc       , DW_FORM_addr,
 497     DW_AT_high_pc      , DW_FORM_addr,
 498 };
 499
 500 static int param_attr [] = {
 501         DW_AT_name,     DW_FORM_string,
 502         DW_AT_type,     DW_FORM_ref4,
 503         DW_AT_location, DW_FORM_block1
 504 };
 505
 506 static int param_loclist_attr [] = {
 507         DW_AT_name,     DW_FORM_string,
 508         DW_AT_type,     DW_FORM_ref4,
 509         DW_AT_location, DW_FORM_data4
 510 };
 511
 512 static int base_type_attr [] = {
 513         DW_AT_byte_size,   DW_FORM_data1,
 514         DW_AT_encoding,    DW_FORM_data1,
 515         DW_AT_name,        DW_FORM_string
 516 };
 517
 518 static int struct_type_attr [] = {
 519         DW_AT_name,        DW_FORM_string,
 520         DW_AT_byte_size,   DW_FORM_udata,
 521 };
 522
 523 static int data_member_attr [] = {
 524         DW_AT_name,        DW_FORM_string,
 525         DW_AT_type,        DW_FORM_ref4,
 526         DW_AT_data_member_location, DW_FORM_block1
 527 };
 528
 529 static int typedef_attr [] = {
 530         DW_AT_name,        DW_FORM_string,
 531         DW_AT_type,        DW_FORM_ref4
 532 };
 533
 534 static int pointer_type_attr [] = {
 535         DW_AT_type,        DW_FORM_ref4,
 536 };
 537
 538 static int reference_type_attr [] = {
 539         DW_AT_type,        DW_FORM_ref4,
 540 };
 541
 542 static int enum_type_attr [] = {
 543         DW_AT_name,        DW_FORM_string,
 544         DW_AT_byte_size,   DW_FORM_udata,
 545         DW_AT_type,        DW_FORM_ref4,
 546 };
 547
 548 static int enumerator_attr [] = {
 549         DW_AT_name,        DW_FORM_string,
 550         DW_AT_const_value, DW_FORM_sdata,
 551 };
 552
 553 static int namespace_attr [] = {
 554         DW_AT_name,        DW_FORM_string,
 555 };
 556
 557 static int variable_attr [] = {
 558         DW_AT_name,     DW_FORM_string,
 559         DW_AT_type,     DW_FORM_ref4,
 560         DW_AT_location, DW_FORM_block1
 561 };
 562
 563 static int variable_loclist_attr [] = {
 564         DW_AT_name,     DW_FORM_string,
 565         DW_AT_type,     DW_FORM_ref4,
 566         DW_AT_location, DW_FORM_data4
 567 };
 568
 569 static int inheritance_attr [] = {
 570         DW_AT_type,        DW_FORM_ref4,
 571         DW_AT_data_member_location, DW_FORM_block1
 572 };
 573
 574 typedef struct DwarfBasicType {
 575         const char *die_name, *name;
 576         int type;
 577         int size;
 578         int encoding;
 579 } DwarfBasicType;
 580
 581 static DwarfBasicType basic_types [] = {
 582         { ".LDIE_I1", "sbyte", MONO_TYPE_I1, 1, DW_ATE_signed },
 583         { ".LDIE_U1", "byte", MONO_TYPE_U1, 1, DW_ATE_unsigned },
 584         { ".LDIE_I2", "short", MONO_TYPE_I2, 2, DW_ATE_signed },
 585         { ".LDIE_U2", "ushort", MONO_TYPE_U2, 2, DW_ATE_unsigned },
 586         { ".LDIE_I4", "int", MONO_TYPE_I4, 4, DW_ATE_signed },
 587         { ".LDIE_U4", "uint", MONO_TYPE_U4, 4, DW_ATE_unsigned },
 588         { ".LDIE_I8", "long", MONO_TYPE_I8, 8, DW_ATE_signed },
 589         { ".LDIE_U8", "ulong", MONO_TYPE_U8, 8, DW_ATE_unsigned },
 590         { ".LDIE_I", "intptr", MONO_TYPE_I, SIZEOF_VOID_P, DW_ATE_signed },
 591         { ".LDIE_U", "uintptr", MONO_TYPE_U, SIZEOF_VOID_P, DW_ATE_unsigned },
 592         { ".LDIE_R4", "float", MONO_TYPE_R4, 4, DW_ATE_float },
 593         { ".LDIE_R8", "double", MONO_TYPE_R8, 8, DW_ATE_float },
 594         { ".LDIE_BOOLEAN", "boolean", MONO_TYPE_BOOLEAN, 1, DW_ATE_boolean },
 595         { ".LDIE_CHAR", "char", MONO_TYPE_CHAR, 2, DW_ATE_unsigned_char },
 596         { ".LDIE_STRING", "string", MONO_TYPE_STRING, sizeof (gpointer), DW_ATE_address },
 597         { ".LDIE_OBJECT", "object", MONO_TYPE_OBJECT, sizeof (gpointer), DW_ATE_address },
 598         { ".LDIE_SZARRAY", "object", MONO_TYPE_SZARRAY, sizeof (gpointer), DW_ATE_address },
 599 };
 600
 601 /* Constants for encoding line number special opcodes */
 602 #define OPCODE_BASE 13
 603 #define LINE_BASE -5
 604 #define LINE_RANGE 14
 605
 606 /* Subsections of the .debug_line section */
 607 #define LINE_SUBSECTION_HEADER 1
 608 #define LINE_SUBSECTION_INCLUDES 2
 609 #define LINE_SUBSECTION_FILES 3
 610 #define LINE_SUBSECTION_DATA 4
 611 #define LINE_SUBSECTION_END 5
 612
 613 static int
 614 emit_line_number_file_name (MonoDwarfWriter *w, const char *name,
 615                                                         gint64 last_mod_time, gint64 file_size)
 616 {
 617         int index;
 618         int dir_index;
 619         char *basename = NULL;
 620
 621         if (!w->file_to_index)
 622                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 623
 624         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 625         if (index > 0)
 626                 return index;
 627
 628         if (g_path_is_absolute (name)) {
 629                 char *dir = g_path_get_dirname (name);
 630
 631                 if (!w->dir_to_index)
 632                         w->dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 633
 634                 dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (w->dir_to_index, dir));
 635                 if (dir_index == 0) {
 636                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
 637                         emit_string (w, dir);
 638
 639                         dir_index = ++ w->line_number_dir_index;
 640                         g_hash_table_insert (w->dir_to_index, g_strdup (dir), GUINT_TO_POINTER (dir_index));
 641                 }
 642
 643                 g_free (dir);
 644
 645                 basename = g_path_get_basename (name);
 646         } else {
 647                 dir_index = 0;
 648         }
 649
 650         emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
 651
 652         if (basename)
 653                 emit_string (w, basename);
 654         else
 655                 emit_string (w, name);
 656         emit_uleb128 (w, dir_index);
 657         emit_byte (w, 0);
 658         emit_byte (w, 0);
 659
 660         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
 661
 662         if (basename)
 663                 g_free (basename);
 664
 665         index = ++ w->line_number_file_index;
 666         g_hash_table_insert (w->file_to_index, g_strdup (name), GUINT_TO_POINTER (index));
 667
 668         return index;
 669 }
 670
 671 static int
 672 get_line_number_file_name (MonoDwarfWriter *w, const char *name)
 673 {
 674         int index;
 675
 676         g_assert (w->file_to_index);
 677         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 678         g_assert (index > 0);
 679         return index - 1;
 680 }
 681
 682 static int
 683 add_line_number_file_name (MonoDwarfWriter *w, const char *name,
 684                                                    gint64 last_mod_time, gint64 file_size)
 685 {
 686         int index;
 687         char *copy;
 688
 689         if (!w->file_to_index) {
 690                 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 691                 w->index_to_file = g_hash_table_new (NULL, NULL);
 692         }
 693
 694         index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
 695         if (index > 0)
 696                 return index - 1;
 697         index = w->line_number_file_index;
 698         w->line_number_file_index ++;
 699         copy = g_strdup (name);
 700         g_hash_table_insert (w->file_to_index, copy, GUINT_TO_POINTER (index + 1));
 701         g_hash_table_insert (w->index_to_file, GUINT_TO_POINTER (index + 1), copy);
 702
 703         return index;
 704 }
 705
 706 char *
 707 mono_dwarf_escape_path (const char *name)
 708 {
 709         if (strchr (name, '\\')) {
 710                 char *s;
 711                 int len, i, j;
 712
 713                 len = strlen (name);
 714                 s = (char *)g_malloc0 ((len + 1) * 2);
 715                 j = 0;
 716                 for (i = 0; i < len; ++i) {
 717                         if (name [i] == '\\') {
 718                                 s [j ++] = '\\';
 719                                 s [j ++] = '\\';
 720                         } else {
 721                                 s [j ++] = name [i];
 722                         }
 723                 }
 724                 return s;
 725         }
 726         return g_strdup (name);
 727 }
 728
 729 static void
 730 emit_all_line_number_info (MonoDwarfWriter *w)
 731 {
 732         int i;
 733         GHashTable *dir_to_index, *index_to_dir;
 734         GSList *l;
 735         GSList *info_list;
 736
 737         g_assert (w->collect_line_info);
 738
 739         add_line_number_file_name (w, "<unknown>", 0, 0);
 740
 741         /* Collect files */
 742         info_list = g_slist_reverse (w->line_info);
 743         for (l = info_list; l; l = l->next) {
 744                 MethodLineNumberInfo *info = (MethodLineNumberInfo *)l->data;
 745                 MonoDebugMethodInfo *minfo;
 746                 GPtrArray *source_file_list;
 747
 748                 // FIXME: Free stuff
 749                 minfo = mono_debug_lookup_method (info->method);
 750                 if (!minfo)
 751                         continue;
 752
 753                 mono_debug_get_seq_points (minfo, NULL, &source_file_list, NULL, NULL, NULL);
 754                 for (i = 0; i < source_file_list->len; ++i) {
 755                         MonoDebugSourceInfo *sinfo = (MonoDebugSourceInfo *)g_ptr_array_index (source_file_list, i);
 756                         add_line_number_file_name (w, sinfo->source_file, 0, 0);
 757                 }
 758         }
 759
 760         /* Preprocess files */
 761         dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
 762         index_to_dir = g_hash_table_new (NULL, NULL);
 763         for (i = 0; i < w->line_number_file_index; ++i) {
 764                 char *name = (char *)g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 765                 char *copy;
 766                 int dir_index = 0;
 767
 768                 if (g_path_is_absolute (name)) {
 769                         char *dir = g_path_get_dirname (name);
 770
 771                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 772                         if (dir_index == 0) {
 773                                 dir_index = w->line_number_dir_index;
 774                                 w->line_number_dir_index ++;
 775                                 copy = g_strdup (dir);
 776                                 g_hash_table_insert (dir_to_index, copy, GUINT_TO_POINTER (dir_index + 1));
 777                                 g_hash_table_insert (index_to_dir, GUINT_TO_POINTER (dir_index + 1), copy);
 778                         } else {
 779                                 dir_index --;
 780                         }
 781
 782                         g_free (dir);
 783                 }
 784         }
 785
 786         /* Line number info header */
 787         emit_section_change (w, ".debug_line", 0);
 788         emit_label (w, ".Ldebug_line_section_start");
 789         emit_label (w, ".Ldebug_line_start");
 790         emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
 791         emit_int16 (w, 0x2); /* version */
 792         emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
 793         emit_byte (w, 1); /* minimum_instruction_length */
 794         emit_byte (w, 1); /* default_is_stmt */
 795         emit_byte (w, LINE_BASE); /* line_base */
 796         emit_byte (w, LINE_RANGE); /* line_range */
 797         emit_byte (w, OPCODE_BASE); /* opcode_base */
 798         emit_byte (w, 0); /* standard_opcode_lengths */
 799         emit_byte (w, 1);
 800         emit_byte (w, 1);
 801         emit_byte (w, 1);
 802         emit_byte (w, 1);
 803         emit_byte (w, 0);
 804         emit_byte (w, 0);
 805         emit_byte (w, 0);
 806         emit_byte (w, 1);
 807         emit_byte (w, 0);
 808         emit_byte (w, 0);
 809         emit_byte (w, 1);
 810
 811         /* Includes */
 812         emit_section_change (w, ".debug_line", 0);
 813         for (i = 0; i < w->line_number_dir_index; ++i) {
 814                 char *dir = (char *)g_hash_table_lookup (index_to_dir, GUINT_TO_POINTER (i + 1));
 815
 816                 emit_string (w, mono_dwarf_escape_path (dir));
 817         }
 818         /* End of Includes */
 819         emit_byte (w, 0);
 820
 821         /* Files */
 822         for (i = 0; i < w->line_number_file_index; ++i) {
 823                 char *name = (char *)g_hash_table_lookup (w->index_to_file, GUINT_TO_POINTER (i + 1));
 824                 char *basename = NULL, *dir;
 825                 int dir_index = 0;
 826
 827                 if (g_path_is_absolute (name)) {
 828                         dir = g_path_get_dirname (name);
 829
 830                         dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (dir_to_index, dir));
 831                         basename = g_path_get_basename (name);
 832                 }
 833
 834                 if (basename)
 835                         emit_string (w, basename);
 836                 else
 837                         emit_string (w, mono_dwarf_escape_path (name));
 838                 emit_uleb128 (w, dir_index);
 839                 emit_byte (w, 0);
 840                 emit_byte (w, 0);
 841         }
 842
 843         /* End of Files */
 844         emit_byte (w, 0);
 845
 846         emit_label (w, ".Ldebug_line_header_end");
 847
 848         /* Emit line number table */
 849         for (l = info_list; l; l = l->next) {
 850                 MethodLineNumberInfo *info = (MethodLineNumberInfo *)l->data;
 851                 MonoDebugMethodJitInfo *dmji;
 852
 853                 dmji = mono_debug_find_method (info->method, mono_domain_get ());
 854                 if (!dmji)
 855                         continue;
 856                 emit_line_number_info (w, info->method, info->start_symbol, info->end_symbol, info->code, info->code_size, dmji);
 857                 mono_debug_free_method_jit_info (dmji);
 858         }
 859         g_slist_free (info_list);
 860
 861         emit_byte (w, 0);
 862         emit_byte (w, 1);
 863         emit_byte (w, DW_LNE_end_sequence);
 864
 865         emit_label (w, ".Ldebug_line_end");
 866 }
 867
 868 /*
 869  * Some assemblers like apple's do not support subsections, so we can't place
 870  * .Ldebug_info_end at the end of the section using subsections. Instead, we
 871  * define it every time something gets added to the .debug_info section.
 872  * The apple assember seems to use the last definition.
 873  */
 874 static void
 875 emit_debug_info_end (MonoDwarfWriter *w)
 876 {
 877         /* This doesn't seem to work/required with recent iphone sdk versions */
 878 #if 0
 879         if (!mono_img_writer_subsections_supported (w->w))
 880                 fprintf (w->fp, "\n.set %sdebug_info_end,.\n", w->temp_prefix);
 881 #endif
 882 }
 883
 884 void
 885 mono_dwarf_writer_emit_base_info (MonoDwarfWriter *w, const char *cu_name, GSList *base_unwind_program)
 886 {
 887         char *s, *build_info;
 888         int i;
 889
 890         w->cie_program = base_unwind_program;
 891
 892         emit_section_change (w, ".debug_abbrev", 0);
 893         emit_dwarf_abbrev (w, ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, TRUE,
 894                                            compile_unit_attr, G_N_ELEMENTS (compile_unit_attr));
 895         emit_dwarf_abbrev (w, ABBREV_SUBPROGRAM, DW_TAG_subprogram, TRUE,
 896                                            subprogram_attr, G_N_ELEMENTS (subprogram_attr));
 897         emit_dwarf_abbrev (w, ABBREV_PARAM, DW_TAG_formal_parameter, FALSE,
 898                                            param_attr, G_N_ELEMENTS (param_attr));
 899         emit_dwarf_abbrev (w, ABBREV_PARAM_LOCLIST, DW_TAG_formal_parameter, FALSE,
 900                                            param_loclist_attr, G_N_ELEMENTS (param_loclist_attr));
 901         emit_dwarf_abbrev (w, ABBREV_BASE_TYPE, DW_TAG_base_type, FALSE,
 902                                            base_type_attr, G_N_ELEMENTS (base_type_attr));
 903         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE, DW_TAG_class_type, TRUE,
 904                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 905         emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE_NOCHILDREN, DW_TAG_class_type, FALSE,
 906                                            struct_type_attr, G_N_ELEMENTS (struct_type_attr));
 907         emit_dwarf_abbrev (w, ABBREV_DATA_MEMBER, DW_TAG_member, FALSE,
 908                                            data_member_attr, G_N_ELEMENTS (data_member_attr));
 909         emit_dwarf_abbrev (w, ABBREV_TYPEDEF, DW_TAG_typedef, FALSE,
 910                                            typedef_attr, G_N_ELEMENTS (typedef_attr));
 911         emit_dwarf_abbrev (w, ABBREV_ENUM_TYPE, DW_TAG_enumeration_type, TRUE,
 912                                            enum_type_attr, G_N_ELEMENTS (enum_type_attr));
 913         emit_dwarf_abbrev (w, ABBREV_ENUMERATOR, DW_TAG_enumerator, FALSE,
 914                                            enumerator_attr, G_N_ELEMENTS (enumerator_attr));
 915         emit_dwarf_abbrev (w, ABBREV_NAMESPACE, DW_TAG_namespace, TRUE,
 916                                            namespace_attr, G_N_ELEMENTS (namespace_attr));
 917         emit_dwarf_abbrev (w, ABBREV_VARIABLE, DW_TAG_variable, FALSE,
 918                                            variable_attr, G_N_ELEMENTS (variable_attr));
 919         emit_dwarf_abbrev (w, ABBREV_VARIABLE_LOCLIST, DW_TAG_variable, FALSE,
 920                                            variable_loclist_attr, G_N_ELEMENTS (variable_loclist_attr));
 921         emit_dwarf_abbrev (w, ABBREV_POINTER_TYPE, DW_TAG_pointer_type, FALSE,
 922                                            pointer_type_attr, G_N_ELEMENTS (pointer_type_attr));
 923         emit_dwarf_abbrev (w, ABBREV_REFERENCE_TYPE, DW_TAG_reference_type, FALSE,
 924                                            reference_type_attr, G_N_ELEMENTS (reference_type_attr));
 925         emit_dwarf_abbrev (w, ABBREV_INHERITANCE, DW_TAG_inheritance, FALSE,
 926                                            inheritance_attr, G_N_ELEMENTS (inheritance_attr));
 927         emit_dwarf_abbrev (w, ABBREV_TRAMP_SUBPROGRAM, DW_TAG_subprogram, FALSE,
 928                                            tramp_subprogram_attr, G_N_ELEMENTS (tramp_subprogram_attr));
 929         emit_byte (w, 0);
 930
 931         emit_section_change (w, ".debug_info", 0);
 932         emit_label (w, ".Ldebug_info_start");
 933         emit_symbol_diff (w, ".Ldebug_info_end", ".Ldebug_info_begin", 0); /* length */
 934         emit_label (w, ".Ldebug_info_begin");
 935         emit_int16 (w, 0x2); /* DWARF version 2 */
 936         emit_int32 (w, 0); /* .debug_abbrev offset */
 937         emit_byte (w, sizeof (gpointer)); /* address size */
 938
 939         if (mono_img_writer_subsections_supported (w->w) && w->appending) {
 940                 /* Emit this into a separate section so it gets placed at the end */
 941                 emit_section_change (w, ".debug_info", 1);
 942                 emit_byte (w, 0); /* close COMPILE_UNIT */
 943                 emit_label (w, ".Ldebug_info_end");
 944                 emit_section_change (w, ".debug_info", 0);
 945         }
 946
 947         /* Compilation unit */
 948         emit_uleb128 (w, ABBREV_COMPILE_UNIT);
 949         build_info = mono_get_runtime_build_info ();
 950         s = g_strdup_printf ("Mono AOT Compiler %s", build_info);
 951         emit_string (w, s);
 952         g_free (build_info);
 953         g_free (s);
 954         emit_string (w, cu_name);
 955         emit_string (w, "");
 956         emit_byte (w, DW_LANG_C);
 957         emit_pointer_value (w, 0);
 958         emit_pointer_value (w, 0);
 959         /* offset into .debug_line section */
 960         if (w->emit_line)
 961                 emit_symbol_diff (w, ".Ldebug_line_start", ".Ldebug_line_section_start", 0);
 962         else
 963                 emit_pointer_value (w, 0);
 964
 965         /* Base types */
 966         for (i = 0; i < G_N_ELEMENTS (basic_types); ++i) {
 967                 emit_label (w, basic_types [i].die_name);
 968                 emit_uleb128 (w, ABBREV_BASE_TYPE);
 969                 emit_byte (w, basic_types [i].size);
 970                 emit_byte (w, basic_types [i].encoding);
 971                 emit_string (w, basic_types [i].name);
 972         }
 973
 974         emit_debug_info_end (w);
 975
 976         /* debug_loc section */
 977         emit_section_change (w, ".debug_loc", 0);
 978         emit_label (w, ".Ldebug_loc_start");
 979
 980         emit_cie (w);
 981 }
 982
 983 /*
 984  * mono_dwarf_writer_close:
 985  *
 986  *   Finalize the emitted debugging info.
 987  */
 988 void
 989 mono_dwarf_writer_close (MonoDwarfWriter *w)
 990 {
 991         if (!w->appending) {
 992                 emit_section_change (w, ".debug_info", 0);
 993                 emit_byte (w, 0); /* close COMPILE_UNIT */
 994                 emit_label (w, ".Ldebug_info_end");
 995         }
 996
 997         if (w->collect_line_info)
 998                 emit_all_line_number_info (w);
 999 }
1000
1001 static void emit_type (MonoDwarfWriter *w, MonoType *t);
1002 static const char* get_type_die (MonoDwarfWriter *w, MonoType *t);
1003
1004 static const char*
1005 get_class_die (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1006 {
1007         GHashTable *cache;
1008
1009         if (vtype)
1010                 cache = w->class_to_vtype_die;
1011         else
1012                 cache = w->class_to_die;
1013
1014         return (const char *)g_hash_table_lookup (cache, klass);
1015 }
1016
1017 /* Returns the local symbol pointing to the emitted debug info */
1018 static char*
1019 emit_class_dwarf_info (MonoDwarfWriter *w, MonoClass *klass, gboolean vtype)
1020 {
1021         char *die, *pointer_die, *reference_die;
1022         char *full_name, *p;
1023         gpointer iter;
1024         MonoClassField *field;
1025         const char *fdie;
1026         int k;
1027         gboolean emit_namespace = FALSE, has_children;
1028         GHashTable *cache;
1029
1030         if (vtype)
1031                 cache = w->class_to_vtype_die;
1032         else
1033                 cache = w->class_to_die;
1034
1035         die = (char *)g_hash_table_lookup (cache, klass);
1036         if (die)
1037                 return die;
1038
1039         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) ||
1040                   (klass->byval_arg.type >= MONO_TYPE_BOOLEAN && klass->byval_arg.type <= MONO_TYPE_R8 && !vtype)))
1041                 return NULL;
1042
1043         /*
1044          * FIXME: gdb can't handle namespaces in languages it doesn't know about.
1045          */
1046         /*
1047         if (klass->name_space && klass->name_space [0] != '\0')
1048                 emit_namespace = TRUE;
1049         */
1050         if (emit_namespace) {
1051                 emit_uleb128 (w, ABBREV_NAMESPACE);
1052                 emit_string (w, klass->name_space);
1053         }
1054
1055         full_name = g_strdup_printf ("%s%s%s", klass->name_space, klass->name_space ? "." : "", klass->name);
1056         /*
1057          * gdb doesn't support namespaces for non-C++ dwarf objects, so use _
1058          * to separate components.
1059          */
1060         for (p = full_name; *p; p ++)
1061                 if (*p == '.')
1062                         *p = '_';
1063
1064         die = g_strdup_printf (".LTDIE_%d", w->tdie_index);
1065         pointer_die = g_strdup_printf (".LTDIE_%d_POINTER", w->tdie_index);
1066         reference_die = g_strdup_printf (".LTDIE_%d_REFERENCE", w->tdie_index);
1067         w->tdie_index ++;
1068
1069         g_hash_table_insert (w->class_to_pointer_die, klass, pointer_die);
1070         g_hash_table_insert (w->class_to_reference_die, klass, reference_die);
1071         g_hash_table_insert (cache, klass, die);
1072
1073         if (klass->enumtype) {
1074                 int size = mono_class_value_size (mono_class_from_mono_type (mono_class_enum_basetype (klass)), NULL);
1075
1076                 emit_label (w, die);
1077
1078                 emit_uleb128 (w, ABBREV_ENUM_TYPE);
1079                 emit_string (w, full_name);
1080                 emit_uleb128 (w, size);
1081                 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
1082                         if (basic_types [k].type == mono_class_enum_basetype (klass)->type)
1083                                 break;
1084                 g_assert (k < G_N_ELEMENTS (basic_types));
1085                 emit_symbol_diff (w, basic_types [k].die_name, ".Ldebug_info_start", 0);
1086
1087                 /* Emit enum values */
1088                 iter = NULL;
1089                 while ((field = mono_class_get_fields (klass, &iter))) {
1090                         const char *p;
1091                         MonoTypeEnum def_type;
1092
1093                         if (!(field->type->attrs & FIELD_ATTRIBUTE_STATIC))
1094                                 continue;
1095                         if (mono_field_is_deleted (field))
1096                                 continue;
1097
1098                         emit_uleb128 (w, ABBREV_ENUMERATOR);
1099                         emit_string (w, mono_field_get_name (field));
1100
1101                         p = mono_class_get_field_default_value (field, &def_type);
1102                         /* len = */ mono_metadata_decode_blob_size (p, &p);
1103                         switch (mono_class_enum_basetype (klass)->type) {
1104                         case MONO_TYPE_U1:
1105                         case MONO_TYPE_I1:
1106                         case MONO_TYPE_BOOLEAN:
1107                                 emit_sleb128 (w, *p);
1108                                 break;
1109                         case MONO_TYPE_U2:
1110                         case MONO_TYPE_I2:
1111                         case MONO_TYPE_CHAR:
1112                                 emit_sleb128 (w, read16 (p));
1113                                 break;
1114                         case MONO_TYPE_U4:
1115                         case MONO_TYPE_I4:
1116                                 emit_sleb128 (w, read32 (p));
1117                                 break;
1118                         case MONO_TYPE_U8:
1119                         case MONO_TYPE_I8:
1120                                 emit_sleb128 (w, read64 (p));
1121                                 break;
1122                         case MONO_TYPE_I:
1123                         case MONO_TYPE_U:
1124 #if SIZEOF_VOID_P == 8
1125                                 emit_sleb128 (w, read64 (p));
1126 #else
1127                                 emit_sleb128 (w, read32 (p));
1128 #endif
1129                                 break;
1130                         default:
1131                                 g_assert_not_reached ();
1132                         }
1133                 }
1134
1135                 has_children = TRUE;
1136         } else {
1137                 guint8 buf [128];
1138                 guint8 *p;
1139                 char *parent_die;
1140
1141                 if (klass->parent)
1142                         parent_die = emit_class_dwarf_info (w, klass->parent, FALSE);
1143                 else
1144                         parent_die = NULL;
1145
1146                 /* Emit field types */
1147                 iter = NULL;
1148                 while ((field = mono_class_get_fields (klass, &iter))) {
1149                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1150                                 continue;
1151
1152                         emit_type (w, field->type);
1153                 }
1154
1155                 iter = NULL;
1156                 has_children = parent_die || mono_class_get_fields (klass, &iter);
1157
1158                 emit_label (w, die);
1159
1160                 emit_uleb128 (w, has_children ? ABBREV_STRUCT_TYPE : ABBREV_STRUCT_TYPE_NOCHILDREN);
1161                 emit_string (w, full_name);
1162                 emit_uleb128 (w, klass->instance_size);
1163
1164                 if (parent_die) {
1165                         emit_uleb128 (w, ABBREV_INHERITANCE);
1166                         emit_symbol_diff (w, parent_die, ".Ldebug_info_start", 0);
1167
1168                         p = buf;
1169                         *p ++= DW_OP_plus_uconst;
1170                         encode_uleb128 (0, p, &p);
1171                         emit_byte (w, p - buf);
1172                         emit_bytes (w, buf, p - buf);
1173                 }
1174
1175                 /* Emit fields */
1176                 iter = NULL;
1177                 while ((field = mono_class_get_fields (klass, &iter))) {
1178                         if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
1179                                 continue;
1180
1181                         fdie = get_type_die (w, field->type);
1182                         if (fdie) {
1183                                 emit_uleb128 (w, ABBREV_DATA_MEMBER);
1184                                 emit_string (w, field->name);
1185                                 emit_symbol_diff (w, fdie, ".Ldebug_info_start", 0);
1186                                 /* location */
1187                                 p = buf;
1188                                 *p ++= DW_OP_plus_uconst;
1189                                 if (klass->valuetype && vtype)
1190                                         encode_uleb128 (field->offset - sizeof (MonoObject), p, &p);
1191                                 else
1192                                         encode_uleb128 (field->offset, p, &p);
1193
1194                                 emit_byte (w, p - buf);
1195                                 emit_bytes (w, buf, p - buf);
1196                         }
1197                 }
1198         }
1199
1200         /* Type end */
1201         if (has_children)
1202                 emit_uleb128 (w, 0x0);
1203
1204         /* Add a typedef, so we can reference the type without a 'struct' in gdb */
1205         emit_uleb128 (w, ABBREV_TYPEDEF);
1206         emit_string (w, full_name);
1207         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1208
1209         /* Add a pointer type */
1210         emit_label (w, pointer_die);
1211
1212         emit_uleb128 (w, ABBREV_POINTER_TYPE);
1213         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1214
1215         /* Add a reference type */
1216         emit_label (w, reference_die);
1217
1218         emit_uleb128 (w, ABBREV_REFERENCE_TYPE);
1219         emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
1220
1221         g_free (full_name);
1222
1223         if (emit_namespace) {
1224                 /* Namespace end */
1225                 emit_uleb128 (w, 0x0);
1226         }
1227
1228         return die;
1229 }
1230
1231 static gboolean base_types_emitted [64];
1232
1233 static const char*
1234 get_type_die (MonoDwarfWriter *w, MonoType *t)
1235 {
1236         MonoClass *klass = mono_class_from_mono_type (t);
1237         int j;
1238         const char *tdie;
1239
1240         if (t->byref) {
1241                 if (t->type == MONO_TYPE_VALUETYPE) {
1242                         tdie = (const char *)g_hash_table_lookup (w->class_to_pointer_die, klass);
1243                 }
1244                 else {
1245                         tdie = get_class_die (w, klass, FALSE);
1246                         /* Should return a pointer type to a reference */
1247                 }
1248                 // FIXME:
1249                 t = &mono_defaults.int_class->byval_arg;
1250         }
1251         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1252                 if (basic_types [j].type == t->type)
1253                         break;
1254         if (j < G_N_ELEMENTS (basic_types)) {
1255                 tdie = basic_types [j].die_name;
1256         } else {
1257                 switch (t->type) {
1258                 case MONO_TYPE_CLASS:
1259                         tdie = (const char *)g_hash_table_lookup (w->class_to_reference_die, klass);
1260                         //tdie = ".LDIE_OBJECT";
1261                         break;
1262                 case MONO_TYPE_ARRAY:
1263                         tdie = ".LDIE_OBJECT";
1264                         break;
1265                 case MONO_TYPE_VALUETYPE:
1266                         if (klass->enumtype)
1267                                 tdie = get_class_die (w, klass, FALSE);
1268                         else
1269                                 tdie = ".LDIE_I4";
1270                         break;
1271                 case MONO_TYPE_GENERICINST:
1272                         if (!MONO_TYPE_ISSTRUCT (t)) {
1273                                 tdie = (const char *)g_hash_table_lookup (w->class_to_reference_die, klass);
1274                         } else {
1275                                 tdie = ".LDIE_I4";
1276                         }
1277                         break;
1278                 case MONO_TYPE_PTR:
1279                         tdie = ".LDIE_I";
1280                         break;
1281                 default:
1282                         tdie = ".LDIE_I4";
1283                         break;
1284                 }
1285         }
1286
1287         g_assert (tdie);
1288
1289         return tdie;
1290 }
1291
1292 static void
1293 emit_type (MonoDwarfWriter *w, MonoType *t)
1294 {
1295         MonoClass *klass = mono_class_from_mono_type (t);
1296         int j;
1297         const char *tdie;
1298
1299         if (t->byref) {
1300                 if (t->type == MONO_TYPE_VALUETYPE) {
1301                         tdie = emit_class_dwarf_info (w, klass, TRUE);
1302                         if (tdie)
1303                                 return;
1304                 }
1305                 else {
1306                         emit_class_dwarf_info (w, klass, FALSE);
1307                 }
1308                 // FIXME:
1309                 t = &mono_defaults.int_class->byval_arg;
1310         }
1311         for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
1312                 if (basic_types [j].type == t->type)
1313                         break;
1314         if (j < G_N_ELEMENTS (basic_types)) {
1315                 /* Emit a boxed version of base types */
1316                 if (j < 64 && !base_types_emitted [j]) {
1317                         emit_class_dwarf_info (w, klass, FALSE);
1318                         base_types_emitted [j] = TRUE;
1319                 }
1320         } else {
1321                 switch (t->type) {
1322                 case MONO_TYPE_CLASS:
1323                         emit_class_dwarf_info (w, klass, FALSE);
1324                         break;
1325                 case MONO_TYPE_ARRAY:
1326                         break;
1327                 case MONO_TYPE_VALUETYPE:
1328                         if (klass->enumtype)
1329                                 emit_class_dwarf_info (w, klass, FALSE);
1330                         break;
1331                 case MONO_TYPE_GENERICINST:
1332                         if (!MONO_TYPE_ISSTRUCT (t))
1333                                 emit_class_dwarf_info (w, klass, FALSE);
1334                         break;
1335                 case MONO_TYPE_PTR:
1336                         break;
1337                 default:
1338                         break;
1339                 }
1340         }
1341 }
1342
1343 static void
1344 emit_var_type (MonoDwarfWriter *w, MonoType *t)
1345 {
1346         const char *tdie;
1347
1348         tdie = get_type_die (w, t);
1349
1350         emit_symbol_diff (w, tdie, ".Ldebug_info_start", 0);
1351 }
1352
1353 static void
1354 encode_var_location (MonoDwarfWriter *w, MonoInst *ins, guint8 *p, guint8 **endp)
1355 {
1356         /* location */
1357         /* FIXME: This needs a location list, since the args can go from reg->stack */
1358         if (!ins || ins->flags & MONO_INST_IS_DEAD) {
1359                 /* gdb treats this as optimized out */
1360         } else if (ins->opcode == OP_REGVAR) {
1361                 *p = DW_OP_reg0 + mono_hw_reg_to_dwarf_reg (ins->dreg);
1362                 p ++;
1363         } else if (ins->opcode == OP_REGOFFSET) {
1364                 *p ++= DW_OP_breg0 + mono_hw_reg_to_dwarf_reg (ins->inst_basereg);
1365                 encode_sleb128 (ins->inst_offset, p, &p);
1366         } else {
1367                 // FIXME:
1368                 *p ++ = DW_OP_reg0;
1369         }
1370
1371         *endp = p;
1372 }
1373
1374 static void
1375 emit_loclist (MonoDwarfWriter *w, MonoInst *ins,
1376                           guint8 *loclist_begin_addr, guint8 *loclist_end_addr,
1377                           guint8 *expr, guint32 expr_len)
1378 {
1379         char label [128];
1380
1381         emit_push_section (w, ".debug_loc", 0);
1382         sprintf (label, ".Lloclist_%d", w->loclist_index ++ );
1383         emit_label (w, label);
1384
1385         emit_pointer_value (w, loclist_begin_addr);
1386         emit_pointer_value (w, loclist_end_addr);
1387         emit_byte (w, expr_len % 256);
1388         emit_byte (w, expr_len / 256);
1389         emit_bytes (w, expr, expr_len);
1390
1391         emit_pointer_value (w, NULL);
1392         emit_pointer_value (w, NULL);
1393
1394         emit_pop_section (w);
1395         emit_symbol_diff (w, label, ".Ldebug_loc_start", 0);
1396 }
1397
1398 /*
1399  * MonoDisHelper->tokener doesn't take an IP argument, and we can't add one since
1400  * it is a public header.
1401  */
1402 static const guint8 *token_handler_ip;
1403
1404 static char*
1405 token_handler (MonoDisHelper *dh, MonoMethod *method, guint32 token)
1406 {
1407         MonoError error;
1408         char *res, *desc;
1409         MonoMethod *cmethod;
1410         MonoClass *klass;
1411         MonoClassField *field;
1412         gpointer data = NULL;
1413
1414         if (method->wrapper_type)
1415                 data = mono_method_get_wrapper_data (method, token);
1416
1417         switch (*token_handler_ip) {
1418         case CEE_ISINST:
1419         case CEE_CASTCLASS:
1420         case CEE_LDELEMA:
1421                 if (method->wrapper_type) {
1422                         klass = (MonoClass *)data;
1423                 } else {
1424                         klass = mono_class_get_checked (method->klass->image, token, &error);
1425                         g_assert (mono_error_ok (&error)); /* FIXME error handling */
1426                 }
1427                 res = g_strdup_printf ("<%s>", klass->name);
1428                 break;
1429         case CEE_NEWOBJ:
1430         case CEE_CALL:
1431         case CEE_CALLVIRT:
1432                 if (method->wrapper_type) {
1433                         cmethod = (MonoMethod *)data;
1434                 } else {
1435                         MonoError error;
1436                         cmethod = mono_get_method_checked (method->klass->image, token, NULL, NULL, &error);
1437                         if (!cmethod)
1438                                 g_error ("Could not load method due to %s", mono_error_get_message (&error)); /* FIXME don't swallow the error */
1439                 }
1440                 desc = mono_method_full_name (cmethod, TRUE);
1441                 res = g_strdup_printf ("<%s>", desc);
1442                 g_free (desc);
1443                 break;
1444         case CEE_CALLI:
1445                 if (method->wrapper_type) {
1446                         desc = mono_signature_get_desc ((MonoMethodSignature *)data, FALSE);
1447                         res = g_strdup_printf ("<%s>", desc);
1448                         g_free (desc);
1449                 } else {
1450                         res = g_strdup_printf ("<0x%08x>", token);
1451                 }
1452                 break;
1453         case CEE_LDFLD:
1454         case CEE_LDSFLD:
1455         case CEE_STFLD:
1456         case CEE_STSFLD:
1457                 if (method->wrapper_type) {
1458                         field = (MonoClassField *)data;
1459                 } else {
1460                         field = mono_field_from_token_checked (method->klass->image, token, &klass, NULL,  &error);
1461                         g_assert (mono_error_ok (&error)); /* FIXME error handling */
1462                 }
1463                 desc = mono_field_full_name (field);
1464                 res = g_strdup_printf ("<%s>", desc);
1465                 g_free (desc);
1466                 break;
1467         default:
1468                 res = g_strdup_printf ("<0x%08x>", token);
1469                 break;
1470         }
1471
1472         return res;
1473 }
1474
1475 /*
1476  * disasm_ins:
1477  *
1478  *   Produce a disassembled form of the IL instruction at IP. This is an extension
1479  * of mono_disasm_code_one () which can disasm tokens, handle wrapper methods, and
1480  * CEE_MONO_ opcodes.
1481  */
1482 static char*
1483 disasm_ins (MonoMethod *method, const guchar *ip, const guint8 **endip)
1484 {
1485         MonoError error;
1486         char *dis;
1487         MonoDisHelper dh;
1488         MonoMethodHeader *header = mono_method_get_header_checked (method, &error);
1489         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1490
1491         memset (&dh, 0, sizeof (dh));
1492         dh.newline = "";
1493         dh.label_format = "IL_%04x: ";
1494         dh.label_target = "IL_%04x";
1495         dh.tokener = token_handler;
1496
1497         token_handler_ip = ip;
1498         if (*ip == MONO_CUSTOM_PREFIX) {
1499                 guint32 token;
1500                 gpointer data;
1501
1502                 switch (ip [1]) {
1503                 case CEE_MONO_ICALL: {
1504                         MonoJitICallInfo *info;
1505
1506                         token = read32 (ip + 2);
1507                         data = mono_method_get_wrapper_data (method, token);
1508                         info = mono_find_jit_icall_by_addr (data);
1509                         g_assert (info);
1510
1511                         dis = g_strdup_printf ("IL_%04x: mono_icall <%s>", (int)(ip - header->code), info->name);
1512                         ip += 6;
1513                         break;
1514                 }
1515                 case CEE_MONO_CLASSCONST: {
1516                         token = read32 (ip + 2);
1517                         data = mono_method_get_wrapper_data (method, token);
1518
1519                         dis = g_strdup_printf ("IL_%04x: mono_classconst <%s>", (int)(ip - header->code), ((MonoClass*)data)->name);
1520                         ip += 6;
1521                         break;
1522                 }
1523                 default:
1524                         dis = mono_disasm_code_one (&dh, method, ip, &ip);
1525                 }
1526         } else {
1527                 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1528         }
1529         token_handler_ip = NULL;
1530
1531         *endip = ip;
1532         mono_metadata_free_mh (header);
1533         return dis;
1534 }
1535
1536 static gint32
1537 il_offset_from_address (MonoMethod *method, MonoDebugMethodJitInfo *jit,
1538                                                 guint32 native_offset)
1539 {
1540         int i;
1541
1542         if (!jit->line_numbers)
1543                 return -1;
1544
1545         for (i = jit->num_line_numbers - 1; i >= 0; i--) {
1546                 MonoDebugLineNumberEntry lne = jit->line_numbers [i];
1547
1548                 if (lne.native_offset <= native_offset)
1549                         return lne.il_offset;
1550         }
1551
1552         return -1;
1553 }
1554
1555 static int max_special_addr_diff = 0;
1556
1557 static inline void
1558 emit_advance_op (MonoDwarfWriter *w, int line_diff, int addr_diff)
1559 {
1560         gint64 opcode = 0;
1561
1562         /* Use a special opcode if possible */
1563         if (line_diff - LINE_BASE >= 0 && line_diff - LINE_BASE < LINE_RANGE) {
1564                 if (max_special_addr_diff == 0)
1565                         max_special_addr_diff = (255 - OPCODE_BASE) / LINE_RANGE;
1566
1567                 if (addr_diff > max_special_addr_diff && (addr_diff < 2 * max_special_addr_diff)) {
1568                         emit_byte (w, DW_LNS_const_add_pc);
1569                         addr_diff -= max_special_addr_diff;
1570                 }
1571
1572                 opcode = (line_diff - LINE_BASE) + (LINE_RANGE * addr_diff) + OPCODE_BASE;
1573                 if (opcode > 255)
1574                         opcode = 0;
1575         }
1576
1577         if (opcode != 0) {
1578                 emit_byte (w, opcode);
1579         } else {
1580                 //printf ("large: %d %d %d\n", line_diff, addr_diff, max_special_addr_diff);
1581                 emit_byte (w, DW_LNS_advance_line);
1582                 emit_sleb128 (w, line_diff);
1583                 emit_byte (w, DW_LNS_advance_pc);
1584                 emit_sleb128 (w, addr_diff);
1585                 emit_byte (w, DW_LNS_copy);
1586         }
1587 }
1588
1589 static gint
1590 compare_lne (MonoDebugLineNumberEntry *a, MonoDebugLineNumberEntry *b)
1591 {
1592         if (a->native_offset == b->native_offset)
1593                 return a->il_offset - b->il_offset;
1594         else
1595                 return a->native_offset - b->native_offset;
1596 }
1597
1598 static void
1599 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method,
1600                                            char *start_symbol, char *end_symbol,
1601                                            guint8 *code, guint32 code_size,
1602                                            MonoDebugMethodJitInfo *debug_info)
1603 {
1604         MonoError error;
1605         guint32 prev_line = 0;
1606         guint32 prev_native_offset = 0;
1607         int i, file_index, il_offset, prev_il_offset;
1608         gboolean first = TRUE;
1609         MonoDebugSourceLocation *loc;
1610         char *prev_file_name = NULL;
1611         MonoMethodHeader *header = mono_method_get_header_checked (method, &error);
1612         MonoDebugMethodInfo *minfo;
1613         MonoDebugLineNumberEntry *ln_array;
1614         int *native_to_il_offset = NULL;
1615
1616         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1617
1618         if (!w->emit_line) {
1619                 mono_metadata_free_mh (header);
1620                 return;
1621         }
1622
1623         minfo = mono_debug_lookup_method (method);
1624
1625         /* Compute the native->IL offset mapping */
1626
1627         g_assert (code_size);
1628
1629         ln_array = g_new0 (MonoDebugLineNumberEntry, debug_info->num_line_numbers);
1630         memcpy (ln_array, debug_info->line_numbers, debug_info->num_line_numbers * sizeof (MonoDebugLineNumberEntry));
1631
1632         qsort (ln_array, debug_info->num_line_numbers, sizeof (MonoDebugLineNumberEntry), (int (*)(const void *, const void *))compare_lne);
1633
1634         native_to_il_offset = g_new0 (int, code_size + 1);
1635
1636         for (i = 0; i < debug_info->num_line_numbers; ++i) {
1637                 int j;
1638                 MonoDebugLineNumberEntry *lne = &ln_array [i];
1639
1640                 if (i == 0) {
1641                         for (j = 0; j < lne->native_offset; ++j)
1642                                 native_to_il_offset [j] = -1;
1643                 }
1644
1645                 if (i < debug_info->num_line_numbers - 1) {
1646                         MonoDebugLineNumberEntry *lne_next = &ln_array [i + 1];
1647
1648                         for (j = lne->native_offset; j < lne_next->native_offset; ++j)
1649                                 native_to_il_offset [j] = lne->il_offset;
1650                 } else {
1651                         for (j = lne->native_offset; j < code_size; ++j)
1652                                 native_to_il_offset [j] = lne->il_offset;
1653                 }
1654         }
1655         g_free (ln_array);
1656
1657         prev_line = 1;
1658         prev_il_offset = -1;
1659
1660         w->cur_file_index = -1;
1661         for (i = 0; i < code_size; ++i) {
1662                 int line_diff, addr_diff;
1663
1664                 if (!minfo)
1665                         continue;
1666
1667                 if (!debug_info->line_numbers)
1668                         continue;
1669
1670                 if (native_to_il_offset)
1671                         il_offset = native_to_il_offset [i];
1672                 else
1673                         il_offset = il_offset_from_address (method, debug_info, i);
1674                 /*
1675                 il_offset = il_offset_from_address (method, debug_info, i);
1676
1677                 g_assert (il_offset == native_to_il_offset [i]);
1678                 */
1679
1680                 il_offset = native_to_il_offset [i];
1681                 if (il_offset < 0)
1682                         continue;
1683
1684                 if (il_offset == prev_il_offset)
1685                         continue;
1686
1687                 prev_il_offset = il_offset;
1688
1689                 loc = mono_debug_symfile_lookup_location (minfo, il_offset);
1690                 if (!loc)
1691                         continue;
1692                 if (!loc->source_file) {
1693                         mono_debug_symfile_free_location (loc);
1694                         continue;
1695                 }
1696
1697                 line_diff = (gint32)loc->row - (gint32)prev_line;
1698                 addr_diff = i - prev_native_offset;
1699
1700                 if (first) {
1701                         emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1702
1703                         emit_byte (w, 0);
1704                         emit_byte (w, sizeof (gpointer) + 1);
1705                         emit_byte (w, DW_LNE_set_address);
1706                         if (start_symbol)
1707                                 emit_pointer_unaligned (w, start_symbol);
1708                         else
1709                                 emit_pointer_value (w, code);
1710                         first = FALSE;
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                                 if (w->cur_file_index != file_index) {
1725                                         emit_byte (w, DW_LNS_set_file);
1726                                         emit_uleb128 (w, file_index);
1727                                         emit_byte (w, DW_LNS_copy);
1728                                         w->cur_file_index = file_index;
1729                                 }
1730                         }
1731                 }
1732
1733                 if (loc->row != prev_line) {
1734                         if (prev_native_offset == 0)
1735                                 emit_byte (w, DW_LNE_set_prologue_end);
1736
1737                         //printf ("X: %p(+0x%x) %d %s:%d(+%d)\n", code + i, addr_diff, loc->il_offset, loc->source_file, loc->row, line_diff);
1738                         emit_advance_op (w, line_diff, addr_diff);
1739
1740                         prev_line = loc->row;
1741                         prev_native_offset = i;
1742                 }
1743
1744                 mono_debug_symfile_free_location (loc);
1745                 first = FALSE;
1746         }
1747
1748         g_free (native_to_il_offset);
1749         g_free (prev_file_name);
1750
1751         if (!first) {
1752                 emit_byte (w, DW_LNS_advance_pc);
1753                 emit_sleb128 (w, code_size - prev_native_offset);
1754                 emit_byte (w, DW_LNS_copy);
1755
1756                 emit_byte (w, 0);
1757                 emit_byte (w, 1);
1758                 emit_byte (w, DW_LNE_end_sequence);
1759         } else if (!start_symbol) {
1760                 /* No debug info, XDEBUG mode */
1761                 char *name, *dis;
1762                 const guint8 *ip = header->code;
1763                 int prev_line, prev_native_offset;
1764                 int *il_to_line;
1765
1766                 /*
1767                  * Emit the IL code into a temporary file and emit line number info
1768                  * referencing that file.
1769                  */
1770
1771                 name = mono_method_full_name (method, TRUE);
1772                 fprintf (w->il_file, "// %s\n", name);
1773                 w->il_file_line_index ++;
1774                 g_free (name);
1775
1776                 il_to_line = g_new0 (int, header->code_size);
1777
1778                 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1779                 emit_byte (w, 0);
1780                 emit_byte (w, sizeof (gpointer) + 1);
1781                 emit_byte (w, DW_LNE_set_address);
1782                 emit_pointer_value (w, code);
1783
1784                 // FIXME: Optimize this
1785                 while (ip < header->code + header->code_size) {
1786                         int il_offset = ip - header->code;
1787
1788                         /* Emit IL */
1789                         w->il_file_line_index ++;
1790
1791                         dis = disasm_ins (method, ip, &ip);
1792                         fprintf (w->il_file, "%s\n", dis);
1793                         g_free (dis);
1794
1795                         il_to_line [il_offset] = w->il_file_line_index;
1796                 }
1797
1798                 /* Emit line number info */
1799                 prev_line = 1;
1800                 prev_native_offset = 0;
1801                 for (i = 0; i < debug_info->num_line_numbers; ++i) {
1802                         MonoDebugLineNumberEntry *lne = &debug_info->line_numbers [i];
1803                         int line;
1804
1805                         if (lne->il_offset >= header->code_size)
1806                                 continue;
1807                         line = il_to_line [lne->il_offset];
1808                         if (!line) {
1809                                 /*
1810                                  * This seems to happen randomly, it looks like il_offset points
1811                                  * into the middle of an instruction.
1812                                  */
1813                                 continue;
1814                                 /*
1815                                 printf ("%s\n", mono_method_full_name (method, TRUE));
1816                                 printf ("%d %d\n", lne->il_offset, header->code_size);
1817                                 g_assert (line);
1818                                 */
1819                         }
1820
1821                         if (line - prev_line != 0) {
1822                                 emit_advance_op (w, line - prev_line, (gint32)lne->native_offset - prev_native_offset);
1823
1824                                 prev_line = line;
1825                                 prev_native_offset = lne->native_offset;
1826                         }
1827                 }
1828
1829                 emit_byte (w, DW_LNS_advance_pc);
1830                 emit_sleb128 (w, code_size - prev_native_offset);
1831                 emit_byte (w, DW_LNS_copy);
1832
1833                 emit_byte (w, 0);
1834                 emit_byte (w, 1);
1835                 emit_byte (w, DW_LNE_end_sequence);
1836
1837                 fflush (w->il_file);
1838                 g_free (il_to_line);
1839         }
1840         mono_metadata_free_mh (header);
1841 }
1842
1843 static MonoMethodVar*
1844 find_vmv (MonoCompile *cfg, MonoInst *ins)
1845 {
1846         int j;
1847
1848         if (cfg->varinfo) {
1849                 for (j = 0; j < cfg->num_varinfo; ++j) {
1850                         if (cfg->varinfo [j] == ins)
1851                                 break;
1852                 }
1853
1854                 if (j < cfg->num_varinfo) {
1855                         return MONO_VARINFO (cfg, j);
1856                 }
1857         }
1858
1859         return NULL;
1860 }
1861
1862 void
1863 mono_dwarf_writer_emit_method (MonoDwarfWriter *w, MonoCompile *cfg, MonoMethod *method, char *start_symbol, char *end_symbol, char *linkage_name,
1864                                                            guint8 *code, guint32 code_size, MonoInst **args, MonoInst **locals, GSList *unwind_info, MonoDebugMethodJitInfo *debug_info)
1865 {
1866         MonoError error;
1867         char *name;
1868         MonoMethodSignature *sig;
1869         MonoMethodHeader *header;
1870         char **names;
1871         MonoDebugLocalsInfo *locals_info;
1872         MonoDebugMethodInfo *minfo;
1873         MonoDebugSourceLocation *loc = NULL;
1874         int i;
1875         guint8 buf [128];
1876         guint8 *p;
1877
1878         emit_section_change (w, ".debug_info", 0);
1879
1880         sig = mono_method_signature (method);
1881         header = mono_method_get_header_checked (method, &error);
1882         mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1883
1884         /* Parameter types */
1885         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1886                 MonoType *t;
1887
1888                 if (i == 0 && sig->hasthis) {
1889                         if (method->klass->valuetype)
1890                                 t = &method->klass->this_arg;
1891                         else
1892                                 t = &method->klass->byval_arg;
1893                 } else {
1894                         t = sig->params [i - sig->hasthis];
1895                 }
1896
1897                 emit_type (w, t);
1898         }
1899         //emit_type (w, &mono_defaults.int32_class->byval_arg);
1900
1901         /* Local types */
1902         for (i = 0; i < header->num_locals; ++i) {
1903                 emit_type (w, header->locals [i]);
1904         }
1905
1906         minfo = mono_debug_lookup_method (method);
1907         if (minfo)
1908                 loc = mono_debug_symfile_lookup_location (minfo, 0);
1909
1910         /* Subprogram */
1911         names = g_new0 (char *, sig->param_count);
1912         mono_method_get_param_names (method, (const char **) names);
1913
1914         emit_uleb128 (w, ABBREV_SUBPROGRAM);
1915         /* DW_AT_name */
1916         name = mono_method_full_name (method, FALSE);
1917         emit_escaped_string (w, name);
1918         /* DW_AT_MIPS_linkage_name */
1919         if (linkage_name)
1920                 emit_string (w, linkage_name);
1921         else
1922                 emit_string (w, "");
1923         /* DW_AT_decl_file/DW_AT_decl_line */
1924         if (loc) {
1925                 int file_index = add_line_number_file_name (w, loc->source_file, 0, 0);
1926                 emit_uleb128 (w, file_index + 1);
1927                 emit_uleb128 (w, loc->row);
1928
1929                 mono_debug_symfile_free_location (loc);
1930                 loc = NULL;
1931         } else {
1932                 emit_uleb128 (w, 0);
1933                 emit_uleb128 (w, 0);
1934         }
1935 #ifndef TARGET_IOS
1936         emit_string (w, name);
1937 #endif
1938         g_free (name);
1939         if (start_symbol) {
1940                 emit_pointer_unaligned (w, start_symbol);
1941                 emit_pointer_unaligned (w, end_symbol);
1942         } else {
1943                 emit_pointer_value (w, code);
1944                 emit_pointer_value (w, code + code_size);
1945         }
1946         /* frame_base */
1947         emit_byte (w, 2);
1948         emit_byte (w, DW_OP_breg6);
1949         emit_byte (w, 16);
1950
1951         /* Parameters */
1952         for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1953                 MonoInst *arg = args ? args [i] : NULL;
1954                 MonoType *t;
1955                 const char *pname;
1956                 char pname_buf [128];
1957                 MonoMethodVar *vmv = NULL;
1958                 gboolean need_loclist = FALSE;
1959
1960                 vmv = find_vmv (cfg, arg);
1961                 if (code && vmv && (vmv->live_range_start || vmv->live_range_end))
1962                         need_loclist = TRUE;
1963
1964                 if (i == 0 && sig->hasthis) {
1965                         if (method->klass->valuetype)
1966                                 t = &method->klass->this_arg;
1967                         else
1968                                 t = &method->klass->byval_arg;
1969                         pname = "this";
1970                 } else {
1971                         t = sig->params [i - sig->hasthis];
1972                         pname = names [i - sig->hasthis];
1973                 }
1974
1975                 emit_uleb128 (w, need_loclist ? ABBREV_PARAM_LOCLIST : ABBREV_PARAM);
1976                 /* name */
1977                 if (pname[0] == '\0') {
1978                         sprintf (pname_buf, "param%d", i - sig->hasthis);
1979                         pname = pname_buf;
1980                 }
1981                 emit_string (w, pname);
1982                 /* type */
1983                 if (!arg || arg->flags & MONO_INST_IS_DEAD)
1984                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1985                 else
1986                         emit_var_type (w, t);
1987
1988                 p = buf;
1989                 encode_var_location (w, arg, p, &p);
1990                 if (need_loclist) {
1991                         vmv->live_range_start = 0;
1992                         if (vmv->live_range_end == 0)
1993                                 /* FIXME: Uses made in calls are not recorded */
1994                                 vmv->live_range_end = code_size;
1995                         emit_loclist (w, arg, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
1996                 } else {
1997                         emit_byte (w, p - buf);
1998                         emit_bytes (w, buf, p - buf);
1999                 }
2000         }
2001         g_free (names);
2002
2003         /* Locals */
2004         locals_info = mono_debug_lookup_locals (method);
2005
2006         for (i = 0; i < header->num_locals; ++i) {
2007                 MonoInst *ins = locals [i];
2008                 char name_buf [128];
2009                 int j;
2010                 MonoMethodVar *vmv = NULL;
2011                 gboolean need_loclist = FALSE;
2012                 char *lname;
2013
2014                 /* ins->dreg no longer contains the original vreg */
2015                 vmv = find_vmv (cfg, ins);
2016                 if (code && vmv) {
2017                         if (vmv->live_range_start) {
2018                                 /* This variable has a precise live range */
2019                                 need_loclist = TRUE;
2020                         }
2021                 }
2022
2023                 emit_uleb128 (w, need_loclist ? ABBREV_VARIABLE_LOCLIST : ABBREV_VARIABLE);
2024                 /* name */
2025                 lname = NULL;
2026                 if (locals_info) {
2027                         for (j = 0; j < locals_info->num_locals; ++j)
2028                                 if (locals_info->locals [j].index == i)
2029                                         break;
2030                         if (j < locals_info->num_locals)
2031                                 lname = locals_info->locals [j].name;
2032                 }
2033                 if (lname) {
2034                         emit_string (w, lname);
2035                 } else {
2036                         sprintf (name_buf, "V_%d", i);
2037                         emit_string (w, name_buf);
2038                 }
2039                 /* type */
2040                 if (!ins || ins->flags & MONO_INST_IS_DEAD)
2041                         emit_var_type (w, &mono_defaults.int32_class->byval_arg);
2042                 else
2043                         emit_var_type (w, header->locals [i]);
2044
2045                 p = buf;
2046                 encode_var_location (w, ins, p, &p);
2047
2048                 if (need_loclist) {
2049                         if (vmv->live_range_end == 0)
2050                                 /* FIXME: Uses made in calls are not recorded */
2051                                 vmv->live_range_end = code_size;
2052                         emit_loclist (w, ins, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
2053                 } else {
2054                         emit_byte (w, p - buf);
2055                         emit_bytes (w, buf, p - buf);
2056                 }
2057         }
2058
2059         if (locals_info)
2060                 mono_debug_free_locals (locals_info);
2061
2062         /* Subprogram end */
2063         emit_uleb128 (w, 0x0);
2064
2065         emit_line (w);
2066
2067         emit_debug_info_end (w);
2068
2069         /* Emit unwind info */
2070         if (unwind_info) {
2071                 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, TRUE);
2072                 w->fde_index ++;
2073         }
2074
2075         /* Emit line number info */
2076         /* != could happen when using --regression */
2077         if (debug_info && (debug_info->code_start == code)) {
2078                 if (w->collect_line_info) {
2079                         MethodLineNumberInfo *info;
2080
2081                         /* Save the information needed to emit the line number info later at once */
2082                         info = g_new0 (MethodLineNumberInfo, 1);
2083                         info->method = method;
2084                         info->start_symbol = g_strdup (start_symbol);
2085                         info->end_symbol = g_strdup (end_symbol);
2086                         info->code = code;
2087                         info->code_size = code_size;
2088                         w->line_info = g_slist_prepend (w->line_info, info);
2089                 } else {
2090                         emit_line_number_info (w, method, start_symbol, end_symbol, code, code_size, debug_info);
2091                 }
2092         }
2093
2094         emit_line (w);
2095         mono_metadata_free_mh (header);
2096 }
2097
2098 void
2099 mono_dwarf_writer_emit_trampoline (MonoDwarfWriter *w, const char *tramp_name, char *start_symbol, char *end_symbol, guint8 *code, guint32 code_size, GSList *unwind_info)
2100 {
2101         emit_section_change (w, ".debug_info", 0);
2102
2103         /* Subprogram */
2104         emit_uleb128 (w, ABBREV_TRAMP_SUBPROGRAM);
2105         emit_string (w, tramp_name);
2106         emit_pointer_value (w, code);
2107         emit_pointer_value (w, code + code_size);
2108
2109         /* Subprogram end */
2110         emit_uleb128 (w, 0x0);
2111
2112         emit_debug_info_end (w);
2113
2114         /* Emit unwind info */
2115         emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, FALSE);
2116         w->fde_index ++;
2117 }
2118 #endif /* End of: !defined(DISABLE_AOT) && !defined(DISABLE_JIT) */