3 * Sequence Points functions
6 * Marcos Henrich (marcos.henrich@xamarin.com)
8 * Copyright 2015 Xamarin, Inc (http://www.xamarin.com)
11 #include "seq-points-data.h"
16 /* When has_debug_data is set to false only il and native deltas are saved */
17 gboolean has_debug_data;
18 /* When alloc_data is set to true data allocation/deallocation is managed by this structure */
20 } SeqPointInfoInflated;
23 encode_var_int (guint8 *buf, guint8 **out_buf, int val)
28 guint8 byte = val & 0x7f;
29 g_assert (size < 4 && "value has more than 28 bits");
43 decode_var_int (guint8* buf, guint8 **out_buf)
49 b = *(p++); low = (b & 0x7f) ; if(!(b & 0x80)) goto done;
50 b = *(p++); low |= (b & 0x7f) << 7; if(!(b & 0x80)) goto done;
51 b = *(p++); low |= (b & 0x7f) << 14; if(!(b & 0x80)) goto done;
52 b = *(p++); low |= (b & 0x7f) << 21; if(!(b & 0x80)) goto done;
54 g_assert (FALSE && "value has more than 28 bits");
65 encode_zig_zag (int val)
67 return (val << 1) ^ (val >> 31);
71 decode_zig_zag (guint32 val)
74 return (n >> 1) ^ (-(n & 1));
77 static SeqPointInfoInflated
78 seq_point_info_inflate (MonoSeqPointInfo *info)
80 SeqPointInfoInflated info_inflated;
81 guint8 *ptr = (guint8*) info;
84 value = decode_var_int (ptr, &ptr);
86 info_inflated.len = value >> 2;
87 info_inflated.has_debug_data = (value & 1) != 0;
88 info_inflated.alloc_data = (value & 2) != 0;
90 if (info_inflated.alloc_data)
91 info_inflated.data = ptr;
93 memcpy (&info_inflated.data, ptr, sizeof (guint8*));
99 mono_seq_point_info_new (int len, gboolean alloc_data, guint8 *data, gboolean has_debug_data, int *out_size)
101 MonoSeqPointInfo *info;
114 buffer_len = encode_var_int (buffer, NULL, value);
116 *out_size = data_size = buffer_len + (alloc_data? len : sizeof (guint8*));
117 info_ptr = g_new0 (guint8, data_size);
118 info = (MonoSeqPointInfo*) info_ptr;
120 memcpy (info_ptr, buffer, buffer_len);
121 info_ptr += buffer_len;
124 memcpy (info_ptr, data, len);
126 memcpy (info_ptr, &data, sizeof (guint8*));
132 mono_seq_point_info_free (gpointer ptr)
134 MonoSeqPointInfo* info = (MonoSeqPointInfo*) ptr;
139 seq_point_read (SeqPoint* seq_point, guint8* ptr, guint8* buffer_ptr, gboolean has_debug_data)
144 value = decode_var_int (ptr, &ptr);
145 seq_point->il_offset += decode_zig_zag (value);
147 value = decode_var_int (ptr, &ptr);
148 seq_point->native_offset += decode_zig_zag (value);
150 if (has_debug_data) {
151 value = decode_var_int (ptr, &ptr);
152 seq_point->flags = value;
154 if (seq_point->flags & MONO_SEQ_POINT_FLAG_EXIT_IL)
155 seq_point->il_offset = METHOD_EXIT_IL_OFFSET;
157 value = decode_var_int (ptr, &ptr);
158 seq_point->next_len = value;
160 if (seq_point->next_len) {
161 // store next offset and skip it
162 seq_point->next_offset = ptr - buffer_ptr;
163 for (i = 0; i < seq_point->next_len; ++i)
164 decode_var_int (ptr, &ptr);
172 mono_seq_point_info_add_seq_point (GByteArray* array, SeqPoint *sp, SeqPoint *last_seq_point, GSList *next, gboolean has_debug_data)
174 int il_delta, native_delta;
180 if (!has_debug_data &&
181 (sp->il_offset == METHOD_ENTRY_IL_OFFSET || sp->il_offset == METHOD_EXIT_IL_OFFSET))
184 il_delta = sp->il_offset - last_seq_point->il_offset;
185 native_delta = sp->native_offset - last_seq_point->native_offset;
189 if (has_debug_data && sp->il_offset == METHOD_EXIT_IL_OFFSET) {
191 flags |= MONO_SEQ_POINT_FLAG_EXIT_IL;
194 len = encode_var_int (buffer, NULL, encode_zig_zag (il_delta));
195 g_byte_array_append (array, buffer, len);
197 len = encode_var_int (buffer, NULL, encode_zig_zag (native_delta));
198 g_byte_array_append (array, buffer, len);
200 if (has_debug_data) {
201 sp->next_offset = array->len;
202 sp->next_len = g_slist_length (next);
204 len = encode_var_int (buffer, NULL, flags);
205 g_byte_array_append (array, buffer, len);
207 len = encode_var_int (buffer, NULL, sp->next_len);
208 g_byte_array_append (array, buffer, len);
210 for (l = next; l; l = l->next) {
211 int next_index = GPOINTER_TO_UINT (l->data);
213 int len = encode_var_int (buffer, NULL, next_index);
214 g_byte_array_append (array, buffer, len);
222 mono_seq_point_find_next_by_native_offset (MonoSeqPointInfo* info, int native_offset, SeqPoint* seq_point)
225 mono_seq_point_iterator_init (&it, info);
226 while (mono_seq_point_iterator_next (&it)) {
227 if (it.seq_point.native_offset >= native_offset) {
228 memcpy (seq_point, &it.seq_point, sizeof (SeqPoint));
237 mono_seq_point_find_prev_by_native_offset (MonoSeqPointInfo* info, int native_offset, SeqPoint* seq_point)
239 SeqPoint prev_seq_point;
240 gboolean is_first = TRUE;
242 mono_seq_point_iterator_init (&it, info);
243 while (mono_seq_point_iterator_next (&it) && it.seq_point.native_offset <= native_offset) {
244 memcpy (&prev_seq_point, &it.seq_point, sizeof (SeqPoint));
248 if (!is_first && prev_seq_point.native_offset <= native_offset) {
249 memcpy (seq_point, &prev_seq_point, sizeof (SeqPoint));
257 mono_seq_point_find_by_il_offset (MonoSeqPointInfo* info, int il_offset, SeqPoint* seq_point)
260 mono_seq_point_iterator_init (&it, info);
261 while (mono_seq_point_iterator_next (&it)) {
262 if (it.seq_point.il_offset == il_offset) {
263 memcpy (seq_point, &it.seq_point, sizeof (SeqPoint));
272 mono_seq_point_init_next (MonoSeqPointInfo* info, SeqPoint sp, SeqPoint* next)
277 GArray* seq_points = g_array_new (FALSE, TRUE, sizeof (SeqPoint));
278 SeqPointInfoInflated info_inflated = seq_point_info_inflate (info);
280 g_assert (info_inflated.has_debug_data);
282 mono_seq_point_iterator_init (&it, info);
283 while (mono_seq_point_iterator_next (&it))
284 g_array_append_vals (seq_points, &it.seq_point, 1);
286 ptr = info_inflated.data + sp.next_offset;
287 for (i = 0; i < sp.next_len; i++) {
289 next_index = decode_var_int (ptr, &ptr);
290 g_assert (next_index < seq_points->len);
291 memcpy (&next[i], seq_points->data + next_index * sizeof (SeqPoint), sizeof (SeqPoint));
294 g_array_free (seq_points, TRUE);
298 mono_seq_point_iterator_next (SeqPointIterator* it)
300 if (it->ptr >= it->end)
303 it->ptr += seq_point_read (&it->seq_point, it->ptr, it->begin, it->has_debug_data);
309 mono_seq_point_iterator_init (SeqPointIterator* it, MonoSeqPointInfo* info)
311 SeqPointInfoInflated info_inflated = seq_point_info_inflate (info);
312 it->ptr = info_inflated.data;
313 it->begin = info_inflated.data;
314 it->end = it->begin + info_inflated.len;
315 it->has_debug_data = info_inflated.has_debug_data;
316 memset(&it->seq_point, 0, sizeof(SeqPoint));
320 mono_seq_point_info_write (MonoSeqPointInfo* info, guint8* buffer)
322 guint8* buffer0 = buffer;
323 SeqPointInfoInflated info_inflated = seq_point_info_inflate (info);
325 encode_var_int (buffer, &buffer, info_inflated.has_debug_data);
327 //Write sequence points
328 encode_var_int (buffer, &buffer, info_inflated.len);
329 memcpy (buffer, info_inflated.data, info_inflated.len);
330 buffer += info_inflated.len;
332 return buffer - buffer0;
336 mono_seq_point_info_read (MonoSeqPointInfo** info, guint8* buffer, gboolean copy)
338 guint8* buffer0 = buffer;
340 gboolean has_debug_data;
342 has_debug_data = decode_var_int (buffer, &buffer);
344 size = decode_var_int (buffer, &buffer);
345 (*info) = mono_seq_point_info_new (size, copy, buffer, has_debug_data, &info_size);
348 return buffer - buffer0;
352 * Returns the maximum size of mono_seq_point_info_write.
355 mono_seq_point_info_get_write_size (MonoSeqPointInfo* info)
357 SeqPointInfoInflated info_inflated = seq_point_info_inflate (info);
359 //4 is the maximum size required to store the size of the data.
360 //1 is the byte used to store has_debug_data.
361 int size = 4 + 1 + info_inflated.len;
367 * SeqPointData struct and functions
368 * This is used to store/load/use sequence point from a file
372 mono_seq_point_data_init (SeqPointData *data, int entry_capacity)
374 data->entry_count = 0;
375 data->entry_capacity = entry_capacity;
376 data->entries = (SeqPointDataEntry *)g_malloc (sizeof (SeqPointDataEntry) * entry_capacity);
380 mono_seq_point_data_free (SeqPointData *data)
383 for (i=0; i<data->entry_count; i++) {
384 if (data->entries [i].free_seq_points)
385 g_free (data->entries [i].seq_points);
387 g_free (data->entries);
391 mono_seq_point_data_read (SeqPointData *data, char *path)
393 guint8 *buffer, *buffer_orig;
398 f = fopen (path, "r");
402 fseek(f, 0, SEEK_END);
404 fseek(f, 0, SEEK_SET);
406 buffer_orig = buffer = (guint8 *)g_malloc (fsize + 1);
407 fread(buffer_orig, fsize, 1, f);
410 entry_count = decode_var_int (buffer, &buffer);
411 mono_seq_point_data_init (data, entry_count);
412 data->entry_count = entry_count;
414 for (i=0; i<entry_count; i++) {
415 data->entries [i].method_token = decode_var_int (buffer, &buffer);
416 data->entries [i].method_index = decode_var_int (buffer, &buffer);
417 buffer += mono_seq_point_info_read (&data->entries [i].seq_points, buffer, TRUE);
418 data->entries [i].free_seq_points = TRUE;
421 g_free (buffer_orig);
426 mono_seq_point_data_write (SeqPointData *data, char *path)
428 guint8 *buffer, *buffer_orig;
432 f = fopen (path, "w+");
436 for (i=0; i<data->entry_count; i++) {
437 size += mono_seq_point_info_get_write_size (data->entries [i].seq_points);
439 // Add size of entry_count and native_base_offsets
440 size += 4 + data->entry_count * 4;
442 buffer_orig = buffer = (guint8 *)g_malloc (size);
444 encode_var_int (buffer, &buffer, data->entry_count);
446 for (i=0; i<data->entry_count; i++) {
447 encode_var_int (buffer, &buffer, data->entries [i].method_token);
448 encode_var_int (buffer, &buffer, data->entries [i].method_index);
449 buffer += mono_seq_point_info_write (data->entries [i].seq_points, buffer);
452 fwrite (buffer_orig, 1, buffer - buffer_orig, f);
453 g_free (buffer_orig);
460 mono_seq_point_data_add (SeqPointData *data, guint32 method_token, guint32 method_index, MonoSeqPointInfo* info)
464 g_assert (data->entry_count < data->entry_capacity);
465 i = data->entry_count++;
466 data->entries [i].seq_points = info;
467 data->entries [i].method_token = method_token;
468 data->entries [i].method_index = method_index;
469 data->entries [i].free_seq_points = FALSE;
473 mono_seq_point_data_get (SeqPointData *data, guint32 method_token, guint32 method_index, MonoSeqPointInfo** info)
477 for (i=0; i<data->entry_count; i++) {
478 if (data->entries [i].method_token == method_token && (method_index == 0xffffff || data->entries [i].method_index == method_index)) {
479 (*info) = data->entries [i].seq_points;
487 mono_seq_point_data_get_il_offset (char *path, guint32 method_token, guint32 method_index, guint32 native_offset, guint32 *il_offset)
489 SeqPointData sp_data;
490 MonoSeqPointInfo *seq_points;
493 if (!mono_seq_point_data_read (&sp_data, path))
496 if (!mono_seq_point_data_get (&sp_data, method_token, method_index, &seq_points))
499 if (!mono_seq_point_find_prev_by_native_offset (seq_points, native_offset, &sp))
502 *il_offset = sp.il_offset;