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2009-03-11 Zoltan Varga <vargaz@gmail.com>
[mono-debugger.git] / mono / mini / dwarfwriter.c
blobb11079c0a85b57bf16b7dad9a57bd1f988d880d2
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 #include "dwarfwriter.h"
12
13 #include <sys/types.h>
14 #include <ctype.h>
15 #include <string.h>
16 #ifdef HAVE_STDINT_H
17 #include <stdint.h>
18 #endif
19
20 #include <mono/metadata/mono-endian.h>
21 #include <mono/metadata/debug-mono-symfile.h>
22 #include <mono/utils/mono-compiler.h>
23
24 #ifndef PLATFORM_WIN32
25 #include <mono/utils/freebsd-elf32.h>
26 #include <mono/utils/freebsd-elf64.h>
27 #endif
28
29 #include <mono/utils/freebsd-dwarf.h>
30
31 struct _MonoDwarfWriter
32 {
33 MonoImageWriter *w;
34 GHashTable *class_to_die;
35 int fde_index, tdie_index, line_number_file_index, line_number_dir_index;
36 GHashTable *file_to_index, *dir_to_index;
37 FILE *il_file;
38 int il_file_line_index, loclist_index;
39 GSList *cie_program;
40 };
41
42 /*
43 * mono_dwarf_writer_create:
44 *
45 * Create a DWARF writer object. WRITER is the underlying image writer this
46 * writer will emit to. IL_FILE is the file where IL code will be dumped to for
47 * methods which have no line number info. It can be NULL.
48 */
49 MonoDwarfWriter*
50 mono_dwarf_writer_create (MonoImageWriter *writer, FILE *il_file)
51 {
52 MonoDwarfWriter *w = g_new0 (MonoDwarfWriter, 1);
53
54 w->w = writer;
55 w->il_file = il_file;
56
57 return w;
58 }
59
60 void
61 mono_dwarf_writer_destroy (MonoDwarfWriter *w)
62 {
63 g_free (w);
64 }
65
66 /* Wrappers around the image writer functions */
67
68 static inline void
69 emit_section_change (MonoDwarfWriter *w, const char *section_name, int subsection_index)
70 {
71 img_writer_emit_section_change (w->w, section_name, subsection_index);
72 }
73
74 static inline void
75 emit_push_section (MonoDwarfWriter *w, const char *section_name, int subsection)
76 {
77 img_writer_emit_push_section (w->w, section_name, subsection);
78 }
79
80 static inline void
81 emit_pop_section (MonoDwarfWriter *w)
82 {
83 img_writer_emit_pop_section (w->w);
84 }
85
86 static inline void
87 emit_local_symbol (MonoDwarfWriter *w, const char *name, const char *end_label, gboolean func)
88 {
89 img_writer_emit_local_symbol (w->w, name, end_label, func);
90 }
91
92 static inline void
93 emit_label (MonoDwarfWriter *w, const char *name)
94 {
95 img_writer_emit_label (w->w, name);
96 }
97
98 static inline void
99 emit_bytes (MonoDwarfWriter *w, const guint8* buf, int size)
100 {
101 img_writer_emit_bytes (w->w, buf, size);
102 }
103
104 static inline void
105 emit_string (MonoDwarfWriter *w, const char *value)
106 {
107 img_writer_emit_string (w->w, value);
108 }
109
110 static inline void
111 emit_line (MonoDwarfWriter *w)
112 {
113 img_writer_emit_line (w->w);
114 }
115
116 static inline void
117 emit_alignment (MonoDwarfWriter *w, int size)
118 {
119 img_writer_emit_alignment (w->w, size);
120 }
121
122 static inline void
123 emit_pointer_unaligned (MonoDwarfWriter *w, const char *target)
124 {
125 img_writer_emit_pointer_unaligned (w->w, target);
126 }
127
128 static inline void
129 emit_pointer (MonoDwarfWriter *w, const char *target)
130 {
131 img_writer_emit_pointer (w->w, target);
132 }
133
134 static inline void
135 emit_int16 (MonoDwarfWriter *w, int value)
136 {
137 img_writer_emit_int16 (w->w, value);
138 }
139
140 static inline void
141 emit_int32 (MonoDwarfWriter *w, int value)
142 {
143 img_writer_emit_int32 (w->w, value);
144 }
145
146 static inline void
147 emit_symbol_diff (MonoDwarfWriter *w, const char *end, const char* start, int offset)
148 {
149 img_writer_emit_symbol_diff (w->w, end, start, offset);
150 }
151
152 static inline void
153 emit_zero_bytes (MonoDwarfWriter *w, int num)
154 {
155 img_writer_emit_zero_bytes (w->w, num);
156 }
157
158 static inline void
159 emit_byte (MonoDwarfWriter *w, guint8 val)
160 {
161 img_writer_emit_byte (w->w, val);
162 }
163
164 static G_GNUC_UNUSED void
165 emit_uleb128 (MonoDwarfWriter *w, guint32 value)
166 {
167 do {
168 guint8 b = value & 0x7f;
169 value >>= 7;
170 if (value != 0) /* more bytes to come */
171 b |= 0x80;
172 emit_byte (w, b);
173 } while (value);
174 }
175
176 static G_GNUC_UNUSED void
177 emit_sleb128 (MonoDwarfWriter *w, gint64 value)
178 {
179 gboolean more = 1;
180 gboolean negative = (value < 0);
181 guint32 size = 64;
182 guint8 byte;
183
184 while (more) {
185 byte = value & 0x7f;
186 value >>= 7;
187 /* the following is unnecessary if the
188 * implementation of >>= uses an arithmetic rather
189 * than logical shift for a signed left operand
190 */
191 if (negative)
192 /* sign extend */
193 value |= - ((gint64)1 <<(size - 7));
194 /* sign bit of byte is second high order bit (0x40) */
195 if ((value == 0 && !(byte & 0x40)) ||
196 (value == -1 && (byte & 0x40)))
197 more = 0;
198 else
199 byte |= 0x80;
200 emit_byte (w, byte);
201 }
202 }
203
204 static G_GNUC_UNUSED void
205 encode_uleb128 (guint32 value, guint8 *buf, guint8 **endbuf)
206 {
207 guint8 *p = buf;
208
209 do {
210 guint8 b = value & 0x7f;
211 value >>= 7;
212 if (value != 0) /* more bytes to come */
213 b |= 0x80;
214 *p ++ = b;
215 } while (value);
216
217 *endbuf = p;
218 }
219
220 static G_GNUC_UNUSED void
221 encode_sleb128 (gint32 value, guint8 *buf, guint8 **endbuf)
222 {
223 gboolean more = 1;
224 gboolean negative = (value < 0);
225 guint32 size = 32;
226 guint8 byte;
227 guint8 *p = buf;
228
229 while (more) {
230 byte = value & 0x7f;
231 value >>= 7;
232 /* the following is unnecessary if the
233 * implementation of >>= uses an arithmetic rather
234 * than logical shift for a signed left operand
235 */
236 if (negative)
237 /* sign extend */
238 value |= - (1 <<(size - 7));
239 /* sign bit of byte is second high order bit (0x40) */
240 if ((value == 0 && !(byte & 0x40)) ||
241 (value == -1 && (byte & 0x40)))
242 more = 0;
243 else
244 byte |= 0x80;
245 *p ++= byte;
246 }
247
248 *endbuf = p;
249 }
250
251 static void
252 emit_dwarf_abbrev (MonoDwarfWriter *w, int code, int tag, gboolean has_child,
253 int *attrs, int attrs_len)
254 {
255 int i;
256
257 emit_uleb128 (w, code);
258 emit_uleb128 (w, tag);
259 emit_byte (w, has_child);
260
261 for (i = 0; i < attrs_len; i++)
262 emit_uleb128 (w, attrs [i]);
263 emit_uleb128 (w, 0);
264 emit_uleb128 (w, 0);
265 }
266
267 static void
268 emit_cie (MonoDwarfWriter *w)
269 {
270 emit_section_change (w, ".debug_frame", 0);
271
272 emit_alignment (w, 8);
273
274 /* Emit a CIE */
275 emit_symbol_diff (w, ".Lcie0_end", ".", -4); /* length */
276 emit_int32 (w, 0xffffffff); /* CIE id */
277 emit_byte (w, 3); /* version */
278 emit_string (w, ""); /* augmention */
279 emit_sleb128 (w, 1); /* code alignment factor */
280 emit_sleb128 (w, mono_unwind_get_dwarf_data_align ()); /* data alignment factor */
281 emit_uleb128 (w, mono_unwind_get_dwarf_pc_reg ());
282
283 w->cie_program = w->cie_program;
284 if (w->cie_program) {
285 guint32 uw_info_len;
286 guint8 *uw_info = mono_unwind_ops_encode (w->cie_program, &uw_info_len);
287 emit_bytes (w, uw_info, uw_info_len);
288 g_free (uw_info);
289 }
290
291 emit_alignment (w, sizeof (gpointer));
292 emit_label (w, ".Lcie0_end");
293 }
294
295 static void
296 emit_pointer_value (MonoDwarfWriter *w, gpointer ptr)
297 {
298 gssize val = (gssize)ptr;
299 emit_bytes (w, (guint8*)&val, sizeof (gpointer));
300 }
301
302 static void
303 emit_fde (MonoDwarfWriter *w, int fde_index, char *start_symbol, char *end_symbol,
304 guint8 *code, guint32 code_size, GSList *unwind_ops, gboolean use_cie)
305 {
306 char symbol [128];
307 GSList *l;
308 guint8 *uw_info;
309 guint32 uw_info_len;
310
311 emit_section_change (w, ".debug_frame", 0);
312
313 sprintf (symbol, ".Lfde%d_end", fde_index);
314 emit_symbol_diff (w, symbol, ".", -4); /* length */
315 emit_int32 (w, 0); /* CIE_pointer */
316 if (start_symbol) {
317 emit_pointer (w, start_symbol); /* initial_location */
318 if (end_symbol)
319 emit_symbol_diff (w, end_symbol, start_symbol, 0); /* address_range */
320 else {
321 g_assert (code_size);
322 emit_int32 (w, code_size);
323 }
324 } else {
325 emit_pointer_value (w, code);
326 emit_int32 (w, code_size);
327 }
328 #if SIZEOF_VOID_P == 8
329 /* Upper 32 bits of code size */
330 emit_int32 (w, 0);
331 #endif
332
333 l = unwind_ops;
334 if (w->cie_program) {
335 // FIXME: Check that the ops really begin with the CIE program */
336 int i;
337
338 for (i = 0; i < g_slist_length (w->cie_program); ++i)
339 l = l->next;
340 }
341
342 /* Convert the list of MonoUnwindOps to the format used by DWARF */
343 uw_info = mono_unwind_ops_encode (l, &uw_info_len);
344 emit_bytes (w, uw_info, uw_info_len);
345 g_free (uw_info);
346
347 emit_alignment (w, sizeof (gpointer));
348 sprintf (symbol, ".Lfde%d_end", fde_index);
349 emit_label (w, symbol);
350 }
351
352 /* Abbrevations */
353 #define ABBREV_COMPILE_UNIT 1
354 #define ABBREV_SUBPROGRAM 2
355 #define ABBREV_PARAM 3
356 #define ABBREV_BASE_TYPE 4
357 #define ABBREV_STRUCT_TYPE 5
358 #define ABBREV_DATA_MEMBER 6
359 #define ABBREV_TYPEDEF 7
360 #define ABBREV_ENUM_TYPE 8
361 #define ABBREV_ENUMERATOR 9
362 #define ABBREV_NAMESPACE 10
363 #define ABBREV_VARIABLE 11
364 #define ABBREV_VARIABLE_LOCLIST 12
365
366 static int compile_unit_attr [] = {
367 DW_AT_producer ,DW_FORM_string,
368 DW_AT_name ,DW_FORM_string,
369 DW_AT_comp_dir ,DW_FORM_string,
370 DW_AT_language ,DW_FORM_data1,
371 DW_AT_low_pc ,DW_FORM_addr,
372 DW_AT_high_pc ,DW_FORM_addr,
373 DW_AT_stmt_list ,DW_FORM_data4
374 };
375
376 static int subprogram_attr [] = {
377 DW_AT_name , DW_FORM_string,
378 DW_AT_low_pc , DW_FORM_addr,
379 DW_AT_high_pc , DW_FORM_addr,
380 DW_AT_frame_base , DW_FORM_block1
381 };
382
383 static int param_attr [] = {
384 DW_AT_name, DW_FORM_string,
385 DW_AT_type, DW_FORM_ref4,
386 DW_AT_location, DW_FORM_block1
387 };
388
389 static int base_type_attr [] = {
390 DW_AT_byte_size, DW_FORM_data1,
391 DW_AT_encoding, DW_FORM_data1,
392 DW_AT_name, DW_FORM_string
393 };
394
395 static int struct_type_attr [] = {
396 DW_AT_name, DW_FORM_string,
397 DW_AT_byte_size, DW_FORM_udata,
398 };
399
400 static int data_member_attr [] = {
401 DW_AT_name, DW_FORM_string,
402 DW_AT_type, DW_FORM_ref4,
403 DW_AT_data_member_location, DW_FORM_block1
404 };
405
406 static int typedef_attr [] = {
407 DW_AT_name, DW_FORM_string,
408 DW_AT_type, DW_FORM_ref4
409 };
410
411 static int enum_type_attr [] = {
412 DW_AT_name, DW_FORM_string,
413 DW_AT_byte_size, DW_FORM_udata,
414 DW_AT_type, DW_FORM_ref4,
415 };
416
417 static int enumerator_attr [] = {
418 DW_AT_name, DW_FORM_string,
419 DW_AT_const_value, DW_FORM_sdata,
420 };
421
422 static int namespace_attr [] = {
423 DW_AT_name, DW_FORM_string,
424 };
425
426 static int variable_attr [] = {
427 DW_AT_name, DW_FORM_string,
428 DW_AT_type, DW_FORM_ref4,
429 DW_AT_location, DW_FORM_block1
430 };
431
432 static int variable_loclist_attr [] = {
433 DW_AT_name, DW_FORM_string,
434 DW_AT_type, DW_FORM_ref4,
435 DW_AT_location, DW_FORM_data4
436 };
437
438 typedef struct DwarfBasicType {
439 const char *die_name, *name;
440 int type;
441 int size;
442 int encoding;
443 } DwarfBasicType;
444
445 static DwarfBasicType basic_types [] = {
446 { ".LDIE_I1", "sbyte", MONO_TYPE_I1, 1, DW_ATE_signed },
447 { ".LDIE_U1", "byte", MONO_TYPE_U1, 1, DW_ATE_unsigned },
448 { ".LDIE_I2", "short", MONO_TYPE_I2, 2, DW_ATE_signed },
449 { ".LDIE_U2", "ushort", MONO_TYPE_U2, 2, DW_ATE_unsigned },
450 { ".LDIE_I4", "int", MONO_TYPE_I4, 4, DW_ATE_signed },
451 { ".LDIE_U4", "uint", MONO_TYPE_U4, 4, DW_ATE_unsigned },
452 { ".LDIE_I8", "long", MONO_TYPE_I8, 8, DW_ATE_signed },
453 { ".LDIE_U8", "ulong", MONO_TYPE_U8, 8, DW_ATE_unsigned },
454 { ".LDIE_I", "intptr", MONO_TYPE_I, SIZEOF_VOID_P, DW_ATE_signed },
455 { ".LDIE_U", "uintptr", MONO_TYPE_U, SIZEOF_VOID_P, DW_ATE_unsigned },
456 { ".LDIE_R4", "float", MONO_TYPE_R4, 4, DW_ATE_float },
457 { ".LDIE_R8", "double", MONO_TYPE_R8, 8, DW_ATE_float },
458 { ".LDIE_BOOLEAN", "boolean", MONO_TYPE_BOOLEAN, 1, DW_ATE_boolean },
459 { ".LDIE_CHAR", "char", MONO_TYPE_CHAR, 2, DW_ATE_unsigned_char },
460 { ".LDIE_STRING", "string", MONO_TYPE_STRING, sizeof (gpointer), DW_ATE_address },
461 { ".LDIE_OBJECT", "object", MONO_TYPE_OBJECT, sizeof (gpointer), DW_ATE_address },
462 { ".LDIE_SZARRAY", "object", MONO_TYPE_SZARRAY, sizeof (gpointer), DW_ATE_address },
463 };
464
465 /* Constants for encoding line number special opcodes */
466 #define OPCODE_BASE 13
467 #define LINE_BASE -5
468 #define LINE_RANGE 14
469
470 /* Subsections of the .debug_line section */
471 #define LINE_SUBSECTION_HEADER 1
472 #define LINE_SUBSECTION_INCLUDES 2
473 #define LINE_SUBSECTION_FILES 3
474 #define LINE_SUBSECTION_DATA 4
475 #define LINE_SUBSECTION_END 5
476
477 static int
478 emit_line_number_file_name (MonoDwarfWriter *w, const char *name,
479 gint64 last_mod_time, gint64 file_size)
480 {
481 int index;
482 int dir_index;
483 char *basename = NULL;
484
485 if (!w->file_to_index)
486 w->file_to_index = g_hash_table_new (g_str_hash, g_str_equal);
487
488 index = GPOINTER_TO_UINT (g_hash_table_lookup (w->file_to_index, name));
489 if (index > 0)
490 return index;
491
492 if (g_path_is_absolute (name)) {
493 char *dir = g_path_get_dirname (name);
494
495 if (!w->dir_to_index)
496 w->dir_to_index = g_hash_table_new (g_str_hash, g_str_equal);
497
498 dir_index = GPOINTER_TO_UINT (g_hash_table_lookup (w->dir_to_index, dir));
499 if (dir_index == 0) {
500 emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
501 emit_string (w, dir);
502
503 dir_index = ++ w->line_number_dir_index;
504 g_hash_table_insert (w->dir_to_index, g_strdup (dir), GUINT_TO_POINTER (dir_index));
505 }
506
507 g_free (dir);
508
509 basename = g_path_get_basename (name);
510 } else {
511 dir_index = 0;
512 }
513
514 emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
515
516 if (basename)
517 emit_string (w, basename);
518 else
519 emit_string (w, name);
520 emit_uleb128 (w, dir_index);
521 emit_byte (w, 0);
522 emit_byte (w, 0);
523
524 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
525
526 if (basename)
527 g_free (basename);
528
529 index = ++ w->line_number_file_index;
530 g_hash_table_insert (w->file_to_index, g_strdup (name), GUINT_TO_POINTER (index));
531
532 return index;
533 }
534
535 static void
536 emit_line_number_info_begin (MonoDwarfWriter *w)
537 {
538 if (!w->il_file) {
539 /* FIXME: This doesn't seem to work with !xdebug */
540 emit_section_change (w, ".debug_line", 0);
541 emit_label (w, ".Ldebug_line_start");
542 emit_label (w, ".Ldebug_line_section_start");
543 return;
544 }
545
546 /* Line number info header */
547 /*
548 * GAS seems to emit its own data to the end of the first subsection, so we use
549 * subsections 1, 2 etc:
550 * 1 - contains the header
551 * 2 - contains the file names
552 * 3 - contains the end of the header + the data
553 * 4 - the end symbol
554 */
555 emit_section_change (w, ".debug_line", 0);
556 emit_label (w, ".Ldebug_line_section_start");
557 emit_section_change (w, ".debug_line", LINE_SUBSECTION_HEADER);
558 emit_label (w, ".Ldebug_line_start");
559 emit_symbol_diff (w, ".Ldebug_line_end", ".", -4); /* length */
560 emit_int16 (w, 0x2); /* version */
561 emit_symbol_diff (w, ".Ldebug_line_header_end", ".", -4); /* header_length */
562 emit_byte (w, 1); /* minimum_instruction_length */
563 emit_byte (w, 1); /* default_is_stmt */
564 emit_byte (w, LINE_BASE); /* line_base */
565 emit_byte (w, LINE_RANGE); /* line_range */
566 emit_byte (w, OPCODE_BASE); /* opcode_base */
567 emit_byte (w, 0); /* standard_opcode_lengths */
568 emit_byte (w, 1);
569 emit_byte (w, 1);
570 emit_byte (w, 1);
571 emit_byte (w, 1);
572 emit_byte (w, 0);
573 emit_byte (w, 0);
574 emit_byte (w, 0);
575 emit_byte (w, 1);
576 emit_byte (w, 0);
577 emit_byte (w, 0);
578 emit_byte (w, 1);
579
580 /* Includes */
581 emit_section_change (w, ".debug_line", LINE_SUBSECTION_INCLUDES);
582
583 /* End of Includes */
584 emit_section_change (w, ".debug_line", LINE_SUBSECTION_FILES);
585 emit_byte (w, 0);
586
587 /* Files */
588 emit_line_number_file_name (w, "xdb.il", 0, 0);
589
590 /* End of Files */
591 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
592 emit_byte (w, 0);
593
594 emit_label (w, ".Ldebug_line_header_end");
595
596 /* Emit this into a separate subsection so it gets placed at the end */
597 emit_section_change (w, ".debug_line", LINE_SUBSECTION_END);
598
599 emit_byte (w, 0);
600 emit_byte (w, 1);
601 emit_byte (w, DW_LNE_end_sequence);
602
603 emit_label (w, ".Ldebug_line_end");
604 }
605
606 void
607 mono_dwarf_writer_emit_base_info (MonoDwarfWriter *w, GSList *base_unwind_program)
608 {
609 char *s, *build_info;
610 int i;
611
612 w->cie_program = base_unwind_program;
613
614 emit_section_change (w, ".debug_abbrev", 0);
615 emit_dwarf_abbrev (w, ABBREV_COMPILE_UNIT, DW_TAG_compile_unit, TRUE,
616 compile_unit_attr, G_N_ELEMENTS (compile_unit_attr));
617 emit_dwarf_abbrev (w, ABBREV_SUBPROGRAM, DW_TAG_subprogram, TRUE,
618 subprogram_attr, G_N_ELEMENTS (subprogram_attr));
619 emit_dwarf_abbrev (w, ABBREV_PARAM, DW_TAG_formal_parameter, FALSE,
620 param_attr, G_N_ELEMENTS (param_attr));
621 emit_dwarf_abbrev (w, ABBREV_BASE_TYPE, DW_TAG_base_type, FALSE,
622 base_type_attr, G_N_ELEMENTS (base_type_attr));
623 emit_dwarf_abbrev (w, ABBREV_STRUCT_TYPE, DW_TAG_class_type, TRUE,
624 struct_type_attr, G_N_ELEMENTS (struct_type_attr));
625 emit_dwarf_abbrev (w, ABBREV_DATA_MEMBER, DW_TAG_member, FALSE,
626 data_member_attr, G_N_ELEMENTS (data_member_attr));
627 emit_dwarf_abbrev (w, ABBREV_TYPEDEF, DW_TAG_typedef, FALSE,
628 typedef_attr, G_N_ELEMENTS (typedef_attr));
629 emit_dwarf_abbrev (w, ABBREV_ENUM_TYPE, DW_TAG_enumeration_type, TRUE,
630 enum_type_attr, G_N_ELEMENTS (enum_type_attr));
631 emit_dwarf_abbrev (w, ABBREV_ENUMERATOR, DW_TAG_enumerator, FALSE,
632 enumerator_attr, G_N_ELEMENTS (enumerator_attr));
633 emit_dwarf_abbrev (w, ABBREV_NAMESPACE, DW_TAG_namespace, TRUE,
634 namespace_attr, G_N_ELEMENTS (namespace_attr));
635 emit_dwarf_abbrev (w, ABBREV_VARIABLE, DW_TAG_variable, FALSE,
636 variable_attr, G_N_ELEMENTS (variable_attr));
637 emit_dwarf_abbrev (w, ABBREV_VARIABLE_LOCLIST, DW_TAG_variable, FALSE,
638 variable_loclist_attr, G_N_ELEMENTS (variable_loclist_attr));
639 emit_byte (w, 0);
640
641 emit_section_change (w, ".debug_info", 0);
642 emit_label (w, ".Ldebug_info_start");
643 emit_symbol_diff (w, ".Ldebug_info_end", ".", -4); /* length */
644 emit_int16 (w, 0x2); /* DWARF version 2 */
645 emit_int32 (w, 0); /* .debug_abbrev offset */
646 emit_byte (w, sizeof (gpointer)); /* address size */
647
648 /* Emit this into a separate section so it gets placed at the end */
649 emit_section_change (w, ".debug_info", 1);
650 emit_int32 (w, 0); /* close everything */
651 emit_label (w, ".Ldebug_info_end");
652 emit_section_change (w, ".debug_info", 0);
653
654 /* Compilation unit */
655 emit_uleb128 (w, ABBREV_COMPILE_UNIT);
656 build_info = mono_get_runtime_build_info ();
657 s = g_strdup_printf ("Mono AOT Compiler %s", build_info);
658 emit_string (w, s);
659 g_free (build_info);
660 g_free (s);
661 emit_string (w, "JITted code");
662 emit_string (w, "");
663 emit_byte (w, DW_LANG_C);
664 emit_pointer_value (w, 0);
665 emit_pointer_value (w, 0);
666 /* offset into .debug_line section */
667 emit_symbol_diff (w, ".Ldebug_line_start", ".Ldebug_line_section_start", 0);
668
669 /* Base types */
670 for (i = 0; i < G_N_ELEMENTS (basic_types); ++i) {
671 emit_label (w, basic_types [i].die_name);
672 emit_uleb128 (w, ABBREV_BASE_TYPE);
673 emit_byte (w, basic_types [i].size);
674 emit_byte (w, basic_types [i].encoding);
675 emit_string (w, basic_types [i].name);
676 }
677
678 /* debug_loc section */
679 emit_section_change (w, ".debug_loc", 0);
680 emit_label (w, ".Ldebug_loc_start");
681
682 /* debug_line section */
683 emit_line_number_info_begin (w);
684
685 emit_cie (w);
686 }
687
688 /* Returns the local symbol pointing to the emitted debug info */
689 static char*
690 emit_class_dwarf_info (MonoDwarfWriter *w, MonoClass *klass)
691 {
692 char *die;
693 char *full_name;
694 gpointer iter;
695 MonoClassField *field;
696 const char *fdie;
697 int k;
698 gboolean emit_namespace = FALSE;
699
700 // FIXME: Appdomains
701 if (!w->class_to_die)
702 w->class_to_die = g_hash_table_new (NULL, NULL);
703
704 die = g_hash_table_lookup (w->class_to_die, klass);
705 if (die)
706 return die;
707
708 if (!((klass->byval_arg.type == MONO_TYPE_CLASS) || klass->enumtype))
709 return NULL;
710
711 /*
712 * FIXME: gdb can't handle namespaces in languages it doesn't know about.
713 */
714 /*
715 if (klass->name_space && klass->name_space [0] != '\0')
716 emit_namespace = TRUE;
717 */
718 if (emit_namespace) {
719 emit_uleb128 (w, ABBREV_NAMESPACE);
720 emit_string (w, klass->name_space);
721 }
722
723 full_name = g_strdup_printf ("%s%s%s", klass->name_space, klass->name_space ? "." : "", klass->name);
724
725 die = g_strdup_printf (".LTDIE_%d", w->tdie_index);
726 emit_label (w, die);
727
728 if (klass->enumtype) {
729 int size = mono_class_value_size (mono_class_from_mono_type (mono_class_enum_basetype (klass)), NULL);
730
731 emit_uleb128 (w, ABBREV_ENUM_TYPE);
732 emit_string (w, full_name);
733 emit_uleb128 (w, size);
734 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
735 if (basic_types [k].type == mono_class_enum_basetype (klass)->type)
736 break;
737 g_assert (k < G_N_ELEMENTS (basic_types));
738 emit_symbol_diff (w, basic_types [k].die_name, ".Ldebug_info_start", 0);
739
740 /* Emit enum values */
741 iter = NULL;
742 while ((field = mono_class_get_fields (klass, &iter))) {
743 const char *p;
744 int len;
745 MonoTypeEnum def_type;
746
747 if (strcmp ("value__", mono_field_get_name (field)) == 0)
748 continue;
749 if (mono_field_is_deleted (field))
750 continue;
751
752 emit_uleb128 (w, ABBREV_ENUMERATOR);
753 emit_string (w, mono_field_get_name (field));
754
755 p = mono_class_get_field_default_value (field, &def_type);
756 len = mono_metadata_decode_blob_size (p, &p);
757 switch (mono_class_enum_basetype (klass)->type) {
758 case MONO_TYPE_U1:
759 case MONO_TYPE_I1:
760 case MONO_TYPE_BOOLEAN:
761 emit_sleb128 (w, *p);
762 break;
763 case MONO_TYPE_U2:
764 case MONO_TYPE_I2:
765 case MONO_TYPE_CHAR:
766 emit_sleb128 (w, read16 (p));
767 break;
768 case MONO_TYPE_U4:
769 case MONO_TYPE_I4:
770 emit_sleb128 (w, read32 (p));
771 break;
772 case MONO_TYPE_U8:
773 case MONO_TYPE_I8:
774 emit_sleb128 (w, read64 (p));
775 break;
776 case MONO_TYPE_I:
777 case MONO_TYPE_U:
778 #if SIZEOF_VOID_P == 8
779 emit_sleb128 (w, read64 (p));
780 #else
781 emit_sleb128 (w, read32 (p));
782 #endif
783 break;
784 default:
785 g_assert_not_reached ();
786 }
787 }
788 } else {
789 emit_uleb128 (w, ABBREV_STRUCT_TYPE);
790 emit_string (w, full_name);
791 emit_uleb128 (w, klass->instance_size);
792
793 /* Emit fields */
794 iter = NULL;
795 while ((field = mono_class_get_fields (klass, &iter))) {
796 guint8 buf [128];
797 guint8 *p;
798
799 if (field->type->attrs & FIELD_ATTRIBUTE_STATIC)
800 continue;
801
802 for (k = 0; k < G_N_ELEMENTS (basic_types); ++k)
803 if (basic_types [k].type == field->type->type)
804 break;
805 if (k < G_N_ELEMENTS (basic_types) && field->type->type != MONO_TYPE_SZARRAY && field->type->type != MONO_TYPE_CLASS) {
806 fdie = basic_types [k].die_name;
807
808 emit_uleb128 (w, ABBREV_DATA_MEMBER);
809 emit_string (w, field->name);
810 emit_symbol_diff (w, fdie, ".Ldebug_info_start", 0);
811 /* location */
812 p = buf;
813 *p ++= DW_OP_plus_uconst;
814 encode_uleb128 (field->offset, p, &p);
815
816 emit_byte (w, p - buf);
817 emit_bytes (w, buf, p - buf);
818 }
819 }
820 }
821
822 /* Type end */
823 emit_uleb128 (w, 0x0);
824
825 /* Add a typedef, so we can reference the type without a 'struct' in gdb */
826 emit_uleb128 (w, ABBREV_TYPEDEF);
827 emit_string (w, full_name);
828 emit_symbol_diff (w, die, ".Ldebug_info_start", 0);
829
830 g_free (full_name);
831 w->tdie_index ++;
832
833
834 if (emit_namespace) {
835 /* Namespace end */
836 emit_uleb128 (w, 0x0);
837 }
838
839 g_hash_table_insert (w->class_to_die, klass, die);
840 return die;
841 }
842
843 static void
844 emit_var_type (MonoDwarfWriter *w, MonoType *t)
845 {
846 MonoClass *klass = mono_class_from_mono_type (t);
847 int j;
848 const char *tdie;
849
850 for (j = 0; j < G_N_ELEMENTS (basic_types); ++j)
851 if (basic_types [j].type == t->type)
852 break;
853 if (j < G_N_ELEMENTS (basic_types))
854 tdie = basic_types [j].die_name;
855 else {
856 switch (t->type) {
857 case MONO_TYPE_CLASS:
858 case MONO_TYPE_ARRAY:
859 tdie = ".LDIE_OBJECT";
860 break;
861 case MONO_TYPE_VALUETYPE:
862 if (klass->enumtype)
863 tdie = emit_class_dwarf_info (w, klass);
864 else
865 tdie = ".LDIE_I4";
866 break;
867 default:
868 tdie = ".LDIE_I4";
869 break;
870 }
871 }
872 if (t->byref)
873 // FIXME:
874 tdie = ".LDIE_I4";
875 emit_symbol_diff (w, tdie, ".Ldebug_info_start", 0);
876 }
877
878 static void
879 encode_var_location (MonoDwarfWriter *w, MonoInst *ins, guint8 *p, guint8 **endp)
880 {
881 /* location */
882 /* FIXME: This needs a location list, since the args can go from reg->stack */
883 if (!ins || ins->flags & MONO_INST_IS_DEAD) {
884 /* gdb treats this as optimized out */
885 } else if (ins->opcode == OP_REGVAR) {
886 *p = DW_OP_reg0 + mono_hw_reg_to_dwarf_reg (ins->dreg);
887 p ++;
888 } else if (ins->opcode == OP_REGOFFSET) {
889 *p ++= DW_OP_breg0 + mono_hw_reg_to_dwarf_reg (ins->inst_basereg);
890 encode_sleb128 (ins->inst_offset, p, &p);
891 } else {
892 // FIXME:
893 *p ++ = DW_OP_reg0;
894 }
895
896 *endp = p;
897 }
898
899 static void
900 emit_loclist (MonoDwarfWriter *w, MonoInst *ins,
901 guint8 *loclist_begin_addr, guint8 *loclist_end_addr,
902 guint8 *expr, guint32 expr_len)
903 {
904 char label [128];
905
906 emit_push_section (w, ".debug_loc", 0);
907 sprintf (label, ".Lloclist_%d", w->loclist_index ++ );
908 emit_label (w, label);
909
910 emit_pointer_value (w, loclist_begin_addr);
911 emit_pointer_value (w, loclist_end_addr);
912 emit_byte (w, expr_len % 256);
913 emit_byte (w, expr_len / 256);
914 emit_bytes (w, expr, expr_len);
915
916 emit_pointer_value (w, NULL);
917 emit_pointer_value (w, NULL);
918
919 emit_pop_section (w);
920 emit_symbol_diff (w, label, ".Ldebug_loc_start", 0);
921 }
922
923 /*
924 * MonoDisHelper->tokener doesn't take an IP argument, and we can't add one since
925 * it is a public header.
926 */
927 static const guint8 *token_handler_ip;
928
929 static char*
930 token_handler (MonoDisHelper *dh, MonoMethod *method, guint32 token)
931 {
932 char *res, *desc;
933 MonoMethod *cmethod;
934 MonoClass *klass;
935 gpointer data = NULL;
936
937 if (method->wrapper_type)
938 data = mono_method_get_wrapper_data (method, token);
939
940 switch (*token_handler_ip) {
941 case CEE_ISINST:
942 case CEE_LDELEMA:
943 if (method->wrapper_type)
944 klass = data;
945 else
946 klass = mono_class_get_full (method->klass->image, token, NULL);
947 res = g_strdup_printf ("<%s>", klass->name);
948 break;
949 case CEE_NEWOBJ:
950 case CEE_CALL:
951 case CEE_CALLVIRT:
952 if (method->wrapper_type)
953 cmethod = data;
954 else
955 cmethod = mono_get_method_full (method->klass->image, token, NULL, NULL);
956 desc = mono_method_full_name (cmethod, TRUE);
957 res = g_strdup_printf ("<%s>", desc);
958 g_free (desc);
959 break;
960 case CEE_CALLI:
961 if (method->wrapper_type) {
962 desc = mono_signature_get_desc (data, FALSE);
963 res = g_strdup_printf ("<%s>", desc);
964 g_free (desc);
965 } else {
966 res = g_strdup_printf ("<0x%08x>", token);
967 }
968 break;
969 default:
970 res = g_strdup_printf ("<0x%08x>", token);
971 break;
972 }
973
974 return res;
975 }
976
977 /*
978 * disasm_ins:
979 *
980 * Produce a disassembled form of the IL instruction at IP. This is an extension
981 * of mono_disasm_code_one () which can disasm tokens, handle wrapper methods, and
982 * CEE_MONO_ opcodes.
983 */
984 static char*
985 disasm_ins (MonoMethod *method, const guchar *ip, const guint8 **endip)
986 {
987 char *dis;
988 MonoDisHelper dh;
989 MonoMethodHeader *header = mono_method_get_header (method);
990
991 memset (&dh, 0, sizeof (dh));
992 dh.newline = "";
993 dh.label_format = "IL_%04x: ";
994 dh.label_target = "IL_%04x";
995 dh.tokener = token_handler;
996
997 token_handler_ip = ip;
998 if (*ip == MONO_CUSTOM_PREFIX) {
999 guint32 token;
1000 gpointer data;
1001
1002 switch (ip [1]) {
1003 case CEE_MONO_ICALL: {
1004 MonoJitICallInfo *info;
1005
1006 token = read32 (ip + 2);
1007 data = mono_method_get_wrapper_data (method, token);
1008 info = mono_find_jit_icall_by_addr (data);
1009 g_assert (info);
1010
1011 dis = g_strdup_printf ("IL_%04x: mono_icall <%s>", (int)(ip - header->code), info->name);
1012 ip += 6;
1013 break;
1014 }
1015 case CEE_MONO_CLASSCONST: {
1016 token = read32 (ip + 2);
1017 data = mono_method_get_wrapper_data (method, token);
1018
1019 dis = g_strdup_printf ("IL_%04x: mono_classconst <%s>", (int)(ip - header->code), ((MonoClass*)data)->name);
1020 ip += 6;
1021 break;
1022 }
1023 default:
1024 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1025 }
1026 } else {
1027 dis = mono_disasm_code_one (&dh, method, ip, &ip);
1028 }
1029 token_handler_ip = NULL;
1030
1031 *endip = ip;
1032 return dis;
1033 }
1034
1035 static gint32
1036 il_offset_from_address (MonoMethod *method, MonoDebugMethodJitInfo *jit,
1037 guint32 native_offset)
1038 {
1039 int i;
1040
1041 if (!jit->line_numbers)
1042 return -1;
1043
1044 for (i = jit->num_line_numbers - 1; i >= 0; i--) {
1045 MonoDebugLineNumberEntry lne = jit->line_numbers [i];
1046
1047 if (lne.native_offset <= native_offset)
1048 return lne.il_offset;
1049 }
1050
1051 return -1;
1052 }
1053
1054 static int max_special_addr_diff = 0;
1055
1056 static inline void
1057 emit_advance_op (MonoDwarfWriter *w, int line_diff, int addr_diff)
1058 {
1059 gint64 opcode = 0;
1060
1061 /* Use a special opcode if possible */
1062 if (line_diff - LINE_BASE >= 0 && line_diff - LINE_BASE < LINE_RANGE) {
1063 if (max_special_addr_diff == 0)
1064 max_special_addr_diff = (255 - OPCODE_BASE) / LINE_RANGE;
1065
1066 if (addr_diff > max_special_addr_diff && (addr_diff < 2 * max_special_addr_diff)) {
1067 emit_byte (w, DW_LNS_const_add_pc);
1068 addr_diff -= max_special_addr_diff;
1069 }
1070
1071 opcode = (line_diff - LINE_BASE) + (LINE_RANGE * addr_diff) + OPCODE_BASE;
1072 if (opcode > 255)
1073 opcode = 0;
1074 }
1075
1076 if (opcode != 0) {
1077 emit_byte (w, opcode);
1078 } else {
1079 emit_byte (w, DW_LNS_advance_line);
1080 emit_sleb128 (w, line_diff);
1081 emit_byte (w, DW_LNS_advance_pc);
1082 emit_sleb128 (w, addr_diff);
1083 emit_byte (w, DW_LNS_copy);
1084 }
1085 }
1086
1087 static void
1088 emit_line_number_info (MonoDwarfWriter *w, MonoMethod *method, guint8 *code,
1089 guint32 code_size, MonoDebugMethodJitInfo *debug_info)
1090 {
1091 guint32 prev_line = 0;
1092 guint32 prev_native_offset = 0;
1093 int i, file_index, il_offset, prev_il_offset;
1094 gboolean first = TRUE;
1095 MonoDebugSourceLocation *loc;
1096 char *prev_file_name = NULL;
1097 MonoMethodHeader *header = mono_method_get_header (method);
1098 MonoDebugMethodInfo *minfo;
1099
1100 if (!code)
1101 // FIXME: The set_address op below only works with xdebug
1102 return;
1103
1104 minfo = mono_debug_lookup_method (method);
1105
1106 /* FIXME: Avoid quadratic behavior */
1107
1108 prev_line = 1;
1109 prev_il_offset = -1;
1110
1111 for (i = 0; i < code_size; ++i) {
1112 if (!minfo)
1113 continue;
1114
1115 if (!debug_info->line_numbers)
1116 continue;
1117
1118 /*
1119 * FIXME: Its hard to optimize this, since the line number info is not
1120 * sorted by il offset or native offset
1121 */
1122 il_offset = il_offset_from_address (method, debug_info, i);
1123
1124 if (il_offset < 0)
1125 continue;
1126
1127 if (il_offset == prev_il_offset)
1128 continue;
1129
1130 prev_il_offset = il_offset;
1131
1132 loc = mono_debug_symfile_lookup_location (minfo, il_offset);
1133
1134 if (loc) {
1135 int line_diff = (gint32)loc->row - (gint32)prev_line;
1136 int addr_diff = i - prev_native_offset;
1137
1138 if (first) {
1139 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1140
1141 emit_byte (w, 0);
1142 emit_byte (w, sizeof (gpointer) + 1);
1143 emit_byte (w, DW_LNE_set_address);
1144 emit_pointer_value (w, code);
1145
1146 /*
1147 * The prolog+initlocals region does not have a line number, this
1148 * makes them belong to the first line of the method.
1149 */
1150 emit_byte (w, DW_LNS_advance_line);
1151 emit_sleb128 (w, (gint32)loc->row - (gint32)prev_line);
1152 prev_line = loc->row;
1153 }
1154
1155 if (loc->row != prev_line) {
1156 if (!prev_file_name || strcmp (loc->source_file, prev_file_name) != 0) {
1157 /* Add an entry to the file table */
1158 /* FIXME: Avoid duplicates */
1159 file_index = emit_line_number_file_name (w, loc->source_file, 0, 0);
1160 g_free (prev_file_name);
1161 prev_file_name = g_strdup (loc->source_file);
1162
1163 emit_byte (w, DW_LNS_set_file);
1164 emit_uleb128 (w, file_index);
1165 emit_byte (w, DW_LNS_copy);
1166 }
1167
1168 //printf ("X: %p(+0x%x) %d %s:%d(+%d)\n", code + i, addr_diff, loc->il_offset, loc->source_file, loc->row, line_diff);
1169
1170 emit_advance_op (w, line_diff, addr_diff);
1171
1172 prev_line = loc->row;
1173 prev_native_offset = i;
1174 }
1175
1176 first = FALSE;
1177 g_free (loc);
1178 }
1179 }
1180
1181 g_free (prev_file_name);
1182
1183 if (!first) {
1184 emit_byte (w, DW_LNS_advance_pc);
1185 emit_sleb128 (w, code_size - prev_native_offset);
1186 emit_byte (w, DW_LNS_copy);
1187
1188 emit_byte (w, 0);
1189 emit_byte (w, 1);
1190 emit_byte (w, DW_LNE_end_sequence);
1191 } else if (code) {
1192 /* No debug info, XDEBUG mode */
1193 char *name, *dis;
1194 const guint8 *ip = header->code;
1195 int prev_line, prev_native_offset;
1196 int *il_to_line;
1197
1198 /*
1199 * Emit the IL code into a temporary file and emit line number info
1200 * referencing that file.
1201 */
1202
1203 name = mono_method_full_name (method, TRUE);
1204 fprintf (w->il_file, "// %s\n", name);
1205 w->il_file_line_index ++;
1206 g_free (name);
1207
1208 il_to_line = g_new0 (int, header->code_size);
1209
1210 emit_section_change (w, ".debug_line", LINE_SUBSECTION_DATA);
1211 emit_byte (w, 0);
1212 emit_byte (w, sizeof (gpointer) + 1);
1213 emit_byte (w, DW_LNE_set_address);
1214 emit_pointer_value (w, code);
1215
1216 // FIXME: Optimize this
1217 while (ip < header->code + header->code_size) {
1218 int il_offset = ip - header->code;
1219
1220 /* Emit IL */
1221 w->il_file_line_index ++;
1222
1223 dis = disasm_ins (method, ip, &ip);
1224 fprintf (w->il_file, "%s\n", dis);
1225 g_free (dis);
1226
1227 il_to_line [il_offset] = w->il_file_line_index;
1228 }
1229
1230 /* Emit line number info */
1231 prev_line = 1;
1232 prev_native_offset = 0;
1233 for (i = 0; i < debug_info->num_line_numbers; ++i) {
1234 MonoDebugLineNumberEntry *lne = &debug_info->line_numbers [i];
1235 int line;
1236
1237 if (lne->il_offset >= header->code_size)
1238 continue;
1239 line = il_to_line [lne->il_offset];
1240 if (!line) {
1241 /* To help debugging */
1242 printf ("%s\n", mono_method_full_name (method, TRUE));
1243 printf ("%d %d\n", lne->il_offset, header->code_size);
1244 g_assert (line);
1245 }
1246
1247 if (line - prev_line != 0) {
1248 emit_advance_op (w, line - prev_line, (gint32)lne->native_offset - prev_native_offset);
1249
1250 prev_line = line;
1251 prev_native_offset = lne->native_offset;
1252 }
1253 }
1254
1255 emit_byte (w, DW_LNS_advance_pc);
1256 emit_sleb128 (w, code_size - prev_native_offset);
1257 emit_byte (w, DW_LNS_copy);
1258
1259 emit_byte (w, 0);
1260 emit_byte (w, 1);
1261 emit_byte (w, DW_LNE_end_sequence);
1262
1263 fflush (w->il_file);
1264 g_free (il_to_line);
1265 }
1266 }
1267
1268 void
1269 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)
1270 {
1271 char *name;
1272 MonoMethodSignature *sig;
1273 MonoMethodHeader *header;
1274 char **names, **tdies, **local_tdies;
1275 char **local_names;
1276 int *local_indexes;
1277 int i, num_locals;
1278 guint8 buf [128];
1279 guint8 *p;
1280
1281 emit_section_change (w, ".debug_info", 0);
1282
1283 sig = mono_method_signature (method);
1284 header = mono_method_get_header (method);
1285
1286 /* Parameter types */
1287 tdies = g_new0 (char *, sig->param_count + sig->hasthis);
1288 for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1289 MonoType *t;
1290
1291 if (i == 0 && sig->hasthis) {
1292 t = &method->klass->this_arg;
1293 } else {
1294 t = sig->params [i - sig->hasthis];
1295 }
1296
1297 emit_class_dwarf_info (w, mono_class_from_mono_type (t));
1298 }
1299
1300 /* Local types */
1301 local_tdies = g_new0 (char *, header->num_locals);
1302 for (i = 0; i < header->num_locals; ++i) {
1303 emit_class_dwarf_info (w, mono_class_from_mono_type (header->locals [i]));
1304 }
1305
1306 /* Subprogram */
1307 names = g_new0 (char *, sig->param_count);
1308 mono_method_get_param_names (method, (const char **) names);
1309
1310 emit_uleb128 (w, ABBREV_SUBPROGRAM);
1311 name = mono_method_full_name (method, FALSE);
1312 emit_string (w, name);
1313 g_free (name);
1314 if (start_symbol) {
1315 emit_pointer_unaligned (w, start_symbol);
1316 emit_pointer_unaligned (w, end_symbol);
1317 } else {
1318 emit_pointer_value (w, code);
1319 emit_pointer_value (w, code + code_size);
1320 }
1321 /* frame_base */
1322 emit_byte (w, 2);
1323 emit_byte (w, DW_OP_breg6);
1324 emit_byte (w, 16);
1325
1326 /* Parameters */
1327 for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
1328 MonoInst *arg = args ? args [i] : NULL;
1329 MonoType *t;
1330 const char *pname;
1331 char pname_buf [128];
1332
1333 if (i == 0 && sig->hasthis) {
1334 t = &mono_defaults.object_class->byval_arg;
1335 pname = "this";
1336 } else {
1337 t = sig->params [i - sig->hasthis];
1338 pname = names [i - sig->hasthis];
1339 }
1340
1341 emit_uleb128 (w, ABBREV_PARAM);
1342 /* name */
1343 if (pname[0] == '\0') {
1344 sprintf (pname_buf, "param%d", i - sig->hasthis);
1345 pname = pname_buf;
1346 }
1347 emit_string (w, pname);
1348 /* type */
1349 if (!arg || arg->flags & MONO_INST_IS_DEAD)
1350 emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1351 else
1352 emit_var_type (w, t);
1353
1354 p = buf;
1355 encode_var_location (w, arg, p, &p);
1356 emit_byte (w, p - buf);
1357 emit_bytes (w, buf, p - buf);
1358 }
1359 g_free (names);
1360
1361 /* Locals */
1362 num_locals = mono_debug_lookup_locals (method, &local_names, &local_indexes);
1363
1364 for (i = 0; i < header->num_locals; ++i) {
1365 MonoInst *ins = locals [i];
1366 char name_buf [128];
1367 int j;
1368 MonoMethodVar *vmv = NULL;
1369 gboolean need_loclist = FALSE;
1370
1371 /* ins->dreg no longer contains the original vreg */
1372 if (cfg->varinfo) {
1373 for (j = 0; j < cfg->num_varinfo; ++j) {
1374 if (cfg->varinfo [j] == ins)
1375 break;
1376 }
1377
1378 if (code && j < cfg->num_varinfo) {
1379 vmv = MONO_VARINFO (cfg, j);
1380 if (vmv->live_range_start) {
1381 /* This variable has a precise live range */
1382 need_loclist = TRUE;
1383 }
1384 }
1385 }
1386
1387 if (need_loclist)
1388 emit_uleb128 (w, ABBREV_VARIABLE_LOCLIST);
1389 else
1390 emit_uleb128 (w, ABBREV_VARIABLE);
1391 /* name */
1392 for (j = 0; j < num_locals; ++j)
1393 if (local_indexes [j] == i)
1394 break;
1395 if (j < num_locals) {
1396 emit_string (w, local_names [j]);
1397 } else {
1398 sprintf (name_buf, "V_%d", i);
1399 emit_string (w, name_buf);
1400 }
1401 /* type */
1402 if (!ins || ins->flags & MONO_INST_IS_DEAD)
1403 emit_var_type (w, &mono_defaults.int32_class->byval_arg);
1404 else
1405 emit_var_type (w, header->locals [i]);
1406
1407 p = buf;
1408 encode_var_location (w, ins, p, &p);
1409
1410 if (need_loclist) {
1411 if (vmv->live_range_end == 0)
1412 /* FIXME: Uses made in calls are not recorded */
1413 vmv->live_range_end = code_size;
1414 emit_loclist (w, ins, code + vmv->live_range_start, code + vmv->live_range_end, buf, p - buf);
1415 } else {
1416 emit_byte (w, p - buf);
1417 emit_bytes (w, buf, p - buf);
1418 }
1419 }
1420
1421 g_free (local_names);
1422 g_free (local_indexes);
1423
1424 /* Subprogram end */
1425 emit_uleb128 (w, 0x0);
1426
1427 emit_line (w);
1428
1429 /* Emit unwind info */
1430 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, TRUE);
1431 w->fde_index ++;
1432
1433 /* Emit line number info */
1434 if (code && debug_info)
1435 emit_line_number_info (w, method, code, code_size, debug_info);
1436
1437 emit_line (w);
1438 }
1439
1440 void
1441 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)
1442 {
1443 emit_section_change (w, ".debug_info", 0);
1444
1445 /* Subprogram */
1446 emit_uleb128 (w, ABBREV_SUBPROGRAM);
1447 emit_string (w, tramp_name);
1448 emit_pointer_value (w, code);
1449 emit_pointer_value (w, code + code_size);
1450 /* frame_base */
1451 emit_byte (w, 2);
1452 emit_byte (w, DW_OP_breg6);
1453 emit_byte (w, 16);
1454
1455 /* Subprogram end */
1456 emit_uleb128 (w, 0x0);
1457
1458 /* Emit unwind info */
1459 emit_fde (w, w->fde_index, start_symbol, end_symbol, code, code_size, unwind_info, FALSE);
1460 w->fde_index ++;
1461 }
Mono Debugger - Cloned from the original SVN repository at mono-cvs.ximian.com