2 * seq-points.c: Sequence Points functions
5 * Marcos Henrich (marcos.henrich@xamarin.com)
7 * Copyright 2014 Xamarin, Inc (http://www.xamarin.com)
8 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
12 #include "seq-points.h"
15 collect_pred_seq_points (MonoBasicBlock *bb, MonoInst *ins, GSList **next, int depth)
18 MonoBasicBlock *in_bb;
21 for (i = 0; i < bb->in_count; ++i) {
22 in_bb = bb->in_bb [i];
24 if (in_bb->last_seq_point) {
25 int src_index = in_bb->last_seq_point->backend.size;
26 int dst_index = ins->backend.size;
28 /* bb->in_bb might contain duplicates */
29 for (l = next [src_index]; l; l = l->next)
30 if (GPOINTER_TO_UINT (l->data) == dst_index)
33 next [src_index] = g_slist_append (next [src_index], GUINT_TO_POINTER (dst_index));
35 /* Have to look at its predecessors */
37 collect_pred_seq_points (in_bb, ins, next, depth + 1);
43 mono_save_seq_point_info (MonoCompile *cfg)
46 GSList *bb_seq_points, *l;
48 MonoDomain *domain = cfg->domain;
53 gboolean has_debug_data = cfg->gen_sdb_seq_points;
58 seq_points = g_new0 (SeqPoint, cfg->seq_points->len);
60 for (i = 0; i < cfg->seq_points->len; ++i) {
61 SeqPoint *sp = &seq_points [i];
62 MonoInst *ins = (MonoInst *)g_ptr_array_index (cfg->seq_points, i);
64 sp->il_offset = ins->inst_imm;
65 sp->native_offset = ins->inst_offset;
66 if (ins->flags & MONO_INST_NONEMPTY_STACK)
67 sp->flags |= MONO_SEQ_POINT_FLAG_NONEMPTY_STACK;
70 ins->backend.size = i;
75 * For each sequence point, compute the list of sequence points immediately
76 * following it, this is needed to implement 'step over' in the debugger agent.
78 next = g_new0 (GSList*, cfg->seq_points->len);
79 for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
80 bb_seq_points = g_slist_reverse (bb->seq_points);
82 for (l = bb_seq_points; l; l = l->next) {
83 MonoInst *ins = (MonoInst *)l->data;
85 if (ins->inst_imm == METHOD_ENTRY_IL_OFFSET || ins->inst_imm == METHOD_EXIT_IL_OFFSET)
86 /* Used to implement method entry/exit events */
88 if (ins->inst_offset == SEQ_POINT_NATIVE_OFFSET_DEAD_CODE)
92 /* Link with the previous seq point in the same bb */
93 next [last->backend.size] = g_slist_append (next [last->backend.size], GUINT_TO_POINTER (ins->backend.size));
95 /* Link with the last bb in the previous bblocks */
96 collect_pred_seq_points (bb, ins, next, 0);
102 /* The second case handles endfinally opcodes which are in a separate bb by themselves */
103 if ((bb->last_ins && bb->last_ins->opcode == OP_ENDFINALLY && bb->seq_points) || (bb->out_count == 1 && bb->out_bb [0]->code && bb->out_bb [0]->code->opcode == OP_ENDFINALLY)) {
105 MonoInst *endfinally_seq_point = NULL;
108 * The ENDFINALLY branches are not represented in the cfg, so link it with all seq points starting bbs.
110 l = g_slist_last (bb->seq_points);
112 endfinally_seq_point = (MonoInst *)l->data;
114 for (bb2 = cfg->bb_entry; bb2; bb2 = bb2->next_bb) {
115 GSList *l = g_slist_last (bb2->seq_points);
118 MonoInst *ins = (MonoInst *)l->data;
120 if (!(ins->inst_imm == METHOD_ENTRY_IL_OFFSET || ins->inst_imm == METHOD_EXIT_IL_OFFSET) && ins != endfinally_seq_point)
121 next [endfinally_seq_point->backend.size] = g_slist_append (next [endfinally_seq_point->backend.size], GUINT_TO_POINTER (ins->backend.size));
128 if (cfg->verbose_level > 2) {
129 printf ("\nSEQ POINT MAP: \n");
131 for (i = 0; i < cfg->seq_points->len; ++i) {
132 SeqPoint *sp = &seq_points [i];
138 printf ("\tIL0x%x[0x%0x] ->", sp->il_offset, sp->native_offset);
139 for (l = next [i]; l; l = l->next) {
140 int next_index = GPOINTER_TO_UINT (l->data);
141 printf (" IL0x%x", seq_points [next_index].il_offset);
148 array = g_byte_array_new ();
150 { /* Add sequence points to seq_point_info */
151 SeqPoint zero_seq_point = {0};
152 SeqPoint* last_seq_point = &zero_seq_point;
154 for (i = 0; i < cfg->seq_points->len; ++i) {
155 SeqPoint *sp = &seq_points [i];
156 GSList* next_list = NULL;
161 if (mono_seq_point_info_add_seq_point (array, sp, last_seq_point, next_list, has_debug_data))
165 g_slist_free (next [i]);
172 cfg->seq_point_info = mono_seq_point_info_new (array->len, TRUE, array->data, has_debug_data, &seq_info_size);
173 mono_jit_stats.allocated_seq_points_size += seq_info_size;
175 g_byte_array_free (array, TRUE);
177 // FIXME: dynamic methods
178 if (!cfg->compile_aot) {
179 mono_domain_lock (domain);
180 // FIXME: How can the lookup succeed ?
181 if (!g_hash_table_lookup (domain_jit_info (domain)->seq_points, cfg->method_to_register))
182 g_hash_table_insert (domain_jit_info (domain)->seq_points, cfg->method_to_register, cfg->seq_point_info);
183 mono_domain_unlock (domain);
186 g_ptr_array_free (cfg->seq_points, TRUE);
187 cfg->seq_points = NULL;
191 mono_get_seq_points (MonoDomain *domain, MonoMethod *method)
193 MonoSeqPointInfo *seq_points;
194 MonoMethod *declaring_generic_method = NULL, *shared_method = NULL;
196 if (method->is_inflated) {
197 declaring_generic_method = mono_method_get_declaring_generic_method (method);
198 shared_method = mini_get_shared_method (method);
202 seq_points = (MonoSeqPointInfo *)g_hash_table_lookup (domain_jit_info (domain)->seq_points, method);
203 if (!seq_points && method->is_inflated) {
204 /* generic sharing + aot */
205 seq_points = (MonoSeqPointInfo *)g_hash_table_lookup (domain_jit_info (domain)->seq_points, declaring_generic_method);
207 seq_points = (MonoSeqPointInfo *)g_hash_table_lookup (domain_jit_info (domain)->seq_points, shared_method);
209 mono_loader_unlock ();
215 * mono_find_next_seq_point_for_native_offset:
217 * Find the first sequence point after NATIVE_OFFSET.
220 mono_find_next_seq_point_for_native_offset (MonoDomain *domain, MonoMethod *method, gint32 native_offset, MonoSeqPointInfo **info, SeqPoint* seq_point)
222 MonoSeqPointInfo *seq_points;
224 seq_points = mono_get_seq_points (domain, method);
233 return mono_seq_point_find_next_by_native_offset (seq_points, native_offset, seq_point);
237 * mono_find_prev_seq_point_for_native_offset:
239 * Find the first sequence point before NATIVE_OFFSET.
242 mono_find_prev_seq_point_for_native_offset (MonoDomain *domain, MonoMethod *method, gint32 native_offset, MonoSeqPointInfo **info, SeqPoint* seq_point)
244 MonoSeqPointInfo *seq_points;
246 seq_points = mono_get_seq_points (domain, method);
255 return mono_seq_point_find_prev_by_native_offset (seq_points, native_offset, seq_point);
259 * mono_find_seq_point:
261 * Find the sequence point corresponding to the IL offset IL_OFFSET, which
262 * should be the location of a sequence point.
265 mono_find_seq_point (MonoDomain *domain, MonoMethod *method, gint32 il_offset, MonoSeqPointInfo **info, SeqPoint *seq_point)
267 MonoSeqPointInfo *seq_points;
269 seq_points = mono_get_seq_points (domain, method);
278 return mono_seq_point_find_by_il_offset (seq_points, il_offset, seq_point);
282 mono_bb_deduplicate_op_il_seq_points (MonoCompile *cfg, MonoBasicBlock *bb)
284 MonoInst *ins, *n, *prev;
286 MONO_BB_FOR_EACH_INS_SAFE (bb, n, ins) {
287 if (ins->opcode != OP_IL_SEQ_POINT)
290 prev = mono_inst_prev (ins, FILTER_NOP);
292 if (!prev || ins == prev || prev->opcode != OP_IL_SEQ_POINT)
295 MONO_REMOVE_INS (bb, prev);