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