mono/mini/dwarfwriter.c

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