+
+void
+mono_linterval_add_range (MonoCompile *cfg, MonoLiveInterval *interval, int from, int to)
+{
+ MonoLiveRange2 *prev_range, *next_range, *new_range;
+
+ g_assert (to >= from);
+
+ /* Optimize for extending the first interval backwards */
+ if (G_LIKELY (interval->range && (interval->range->from > from) && (interval->range->from == to))) {
+ interval->range->from = from;
+ return;
+ }
+
+ /* Find a place in the list for the new range */
+ prev_range = NULL;
+ next_range = interval->range;
+ while ((next_range != NULL) && (next_range->from <= from)) {
+ prev_range = next_range;
+ next_range = next_range->next;
+ }
+
+ if (prev_range && prev_range->to == from) {
+ /* Merge with previous */
+ prev_range->to = to;
+ } else if (next_range && next_range->from == to) {
+ /* Merge with previous */
+ next_range->from = from;
+ } else {
+ /* Insert it */
+ new_range = mono_mempool_alloc (cfg->mempool, sizeof (MonoLiveRange2));
+ new_range->from = from;
+ new_range->to = to;
+ new_range->next = NULL;
+
+ if (prev_range)
+ prev_range->next = new_range;
+ else
+ interval->range = new_range;
+ if (next_range)
+ new_range->next = next_range;
+ else
+ interval->last_range = new_range;
+ }
+
+ /* FIXME: Merge intersecting ranges */
+}
+
+void
+mono_linterval_print (MonoLiveInterval *interval)
+{
+ MonoLiveRange2 *range;
+
+ for (range = interval->range; range != NULL; range = range->next)
+ printf ("[%x-%x] ", range->from, range->to);
+}
+
+void
+mono_linterval_print_nl (MonoLiveInterval *interval)
+{
+ mono_linterval_print (interval);
+ printf ("\n");
+}
+
+/**
+ * mono_linterval_convers:
+ *
+ * Return whenever INTERVAL covers the position POS.
+ */
+gboolean
+mono_linterval_covers (MonoLiveInterval *interval, int pos)
+{
+ MonoLiveRange2 *range;
+
+ for (range = interval->range; range != NULL; range = range->next) {
+ if (pos >= range->from && pos <= range->to)
+ return TRUE;
+ if (range->from > pos)
+ return FALSE;
+ }
+
+ return FALSE;
+}
+
+/**
+ * mono_linterval_get_intersect_pos:
+ *
+ * Determine whenever I1 and I2 intersect, and if they do, return the first
+ * point of intersection. Otherwise, return -1.
+ */
+gint32
+mono_linterval_get_intersect_pos (MonoLiveInterval *i1, MonoLiveInterval *i2)
+{
+ MonoLiveRange2 *r1, *r2;
+
+ /* FIXME: Optimize this */
+ for (r1 = i1->range; r1 != NULL; r1 = r1->next) {
+ for (r2 = i2->range; r2 != NULL; r2 = r2->next) {
+ if (r2->to > r1->from && r2->from < r1->to) {
+ if (r2->from <= r1->from)
+ return r1->from;
+ else
+ return r2->from;
+ }
+ }
+ }
+
+ return -1;
+}
+
+/**
+ * mono_linterval_split
+ *
+ * Split L at POS and store the newly created intervals into L1 and L2. POS becomes
+ * part of L2.
+ */
+void
+mono_linterval_split (MonoCompile *cfg, MonoLiveInterval *interval, MonoLiveInterval **i1, MonoLiveInterval **i2, int pos)
+{
+ MonoLiveRange2 *r;
+
+ g_assert (pos > interval->range->from && pos <= interval->last_range->to);
+
+ *i1 = mono_mempool_alloc0 (cfg->mempool, sizeof (MonoLiveInterval));
+ *i2 = mono_mempool_alloc0 (cfg->mempool, sizeof (MonoLiveInterval));
+
+ for (r = interval->range; r; r = r->next) {
+ if (pos > r->to) {
+ /* Add it to the first child */
+ mono_linterval_add_range (cfg, *i1, r->from, r->to);
+ } else if (pos > r->from && pos <= r->to) {
+ /* Split at pos */
+ mono_linterval_add_range (cfg, *i1, r->from, pos - 1);
+ mono_linterval_add_range (cfg, *i2, pos, r->to);
+ } else {
+ /* Add it to the second child */
+ mono_linterval_add_range (cfg, *i2, r->from, r->to);
+ }
+ }
+}
+
+#if 1
+#define LIVENESS_DEBUG(a) do { if (cfg->verbose_level > 1) do { a; } while (0); } while (0)
+#define ENABLE_LIVENESS_DEBUG 1
+#else
+#define LIVENESS_DEBUG(a)
+#endif
+
+#ifdef ENABLE_LIVENESS2
+
+static inline void
+update_liveness2 (MonoCompile *cfg, MonoInst *ins, gboolean set_volatile, int inst_num, gint32 *last_use)
+{
+ const char *spec = INS_INFO (ins->opcode);
+ int sreg;
+ int num_sregs, i;
+ int sregs [MONO_MAX_SRC_REGS];
+
+ LIVENESS_DEBUG (printf ("\t%x: ", inst_num); mono_print_ins (ins));
+
+ if (ins->opcode == OP_NOP)
+ return;
+
+ /* DREG */
+ if ((spec [MONO_INST_DEST] != ' ') && get_vreg_to_inst (cfg, ins->dreg)) {
+ MonoInst *var = get_vreg_to_inst (cfg, ins->dreg);
+ int idx = var->inst_c0;
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+
+ if (MONO_IS_STORE_MEMBASE (ins)) {
+ if (last_use [idx] == 0) {
+ LIVENESS_DEBUG (printf ("\tlast use of R%d set to %x\n", ins->dreg, inst_num));
+ last_use [idx] = inst_num;
+ }
+ } else {
+ if (last_use [idx] > 0) {
+ LIVENESS_DEBUG (printf ("\tadd range to R%d: [%x, %x)\n", ins->dreg, inst_num, last_use [idx]));
+ mono_linterval_add_range (cfg, vi->interval, inst_num, last_use [idx]);
+ last_use [idx] = 0;
+ }
+ else {
+ /* Try dead code elimination */
+ if ((var != cfg->ret) && !(var->flags & (MONO_INST_VOLATILE|MONO_INST_INDIRECT)) && ((ins->opcode == OP_ICONST) || (ins->opcode == OP_I8CONST) || (ins->opcode == OP_R8CONST)) && !(var->flags & MONO_INST_VOLATILE)) {
+ LIVENESS_DEBUG (printf ("\tdead def of R%d, eliminated\n", ins->dreg));
+ ins->opcode = OP_NOP;
+ ins->dreg = -1;
+ MONO_INST_NULLIFY_SREGS (ins);
+ return;
+ }
+
+ LIVENESS_DEBUG (printf ("\tdead def of R%d, add range to R%d: [%x, %x]\n", ins->dreg, ins->dreg, inst_num, inst_num + 1));
+ mono_linterval_add_range (cfg, vi->interval, inst_num, inst_num + 1);
+ }
+ }
+ }
+
+ /* SREGs */
+ num_sregs = mono_inst_get_src_registers (ins, sregs);
+ for (i = 0; i < num_sregs; ++i) {
+ sreg = sregs [i];
+ if ((spec [MONO_INST_SRC1 + i] != ' ') && get_vreg_to_inst (cfg, sreg)) {
+ MonoInst *var = get_vreg_to_inst (cfg, sreg);
+ int idx = var->inst_c0;
+
+ if (last_use [idx] == 0) {
+ LIVENESS_DEBUG (printf ("\tlast use of R%d set to %x\n", sreg, inst_num));
+ last_use [idx] = inst_num;
+ }
+ }
+ }
+}
+
+static void
+mono_analyze_liveness2 (MonoCompile *cfg)
+{
+ int bnum, idx, i, j, nins, max, max_vars, block_from, block_to, pos, reverse_len;
+ gint32 *last_use;
+ static guint32 disabled = -1;
+ MonoInst **reverse;
+
+ if (disabled == -1)
+ disabled = g_getenv ("DISABLED") != NULL;
+
+ if (disabled)
+ return;
+
+ LIVENESS_DEBUG (printf ("LIVENESS 2 %s\n", mono_method_full_name (cfg->method, TRUE)));
+
+ /*
+ if (strstr (cfg->method->name, "test_") != cfg->method->name)
+ return;
+ */
+
+ max_vars = cfg->num_varinfo;
+ last_use = g_new0 (gint32, max_vars);
+
+ reverse_len = 1024;
+ reverse = mono_mempool_alloc (cfg->mempool, sizeof (MonoInst*) * reverse_len);
+
+ for (idx = 0; idx < max_vars; ++idx) {
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+
+ vi->interval = mono_mempool_alloc0 (cfg->mempool, sizeof (MonoLiveInterval));
+ }
+
+ /*
+ * Process bblocks in reverse order, so the addition of new live ranges
+ * to the intervals is faster.
+ */
+ for (bnum = cfg->num_bblocks - 1; bnum >= 0; --bnum) {
+ MonoBasicBlock *bb = cfg->bblocks [bnum];
+ MonoInst *ins;
+
+ block_from = (bb->dfn << 16) + 1; /* so pos > 0 */
+ if (bnum < cfg->num_bblocks - 1)
+ /* Beginning of the next bblock */
+ block_to = (cfg->bblocks [bnum + 1]->dfn << 16) + 1;
+ else
+ block_to = (bb->dfn << 16) + 0xffff;
+
+ LIVENESS_DEBUG (printf ("LIVENESS BLOCK BB%d:\n", bb->block_num));
+
+ memset (last_use, 0, max_vars * sizeof (gint32));
+
+ /* For variables in bb->live_out, set last_use to block_to */
+
+ max = ((max_vars + (BITS_PER_CHUNK -1)) / BITS_PER_CHUNK);
+ for (j = 0; j < max; ++j) {
+ gsize bits_out;
+ int k;
+
+ bits_out = mono_bitset_get_fast (bb->live_out_set, j);
+ k = (j * BITS_PER_CHUNK);
+ while (bits_out) {
+ if (bits_out & 1) {
+ LIVENESS_DEBUG (printf ("Var R%d live at exit, set last_use to %x\n", cfg->varinfo [k]->dreg, block_to));
+ last_use [k] = block_to;
+ }
+ bits_out >>= 1;
+ k ++;
+ }
+ }
+
+ if (cfg->ret)
+ last_use [cfg->ret->inst_c0] = block_to;
+
+ for (nins = 0, pos = block_from, ins = bb->code; ins; ins = ins->next, ++nins, ++pos) {
+ if (nins >= reverse_len) {
+ int new_reverse_len = reverse_len * 2;
+ MonoInst **new_reverse = mono_mempool_alloc (cfg->mempool, sizeof (MonoInst*) * new_reverse_len);
+ memcpy (new_reverse, reverse, sizeof (MonoInst*) * reverse_len);
+ reverse = new_reverse;
+ reverse_len = new_reverse_len;
+ }
+
+ reverse [nins] = ins;
+ }
+
+ /* Process instructions backwards */
+ for (i = nins - 1; i >= 0; --i) {
+ MonoInst *ins = (MonoInst*)reverse [i];
+
+ update_liveness2 (cfg, ins, FALSE, pos, last_use);
+
+ pos --;
+ }
+
+ for (idx = 0; idx < max_vars; ++idx) {
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+
+ if (last_use [idx] != 0) {
+ /* Live at exit, not written -> live on enter */
+ LIVENESS_DEBUG (printf ("Var R%d live at enter, add range to R%d: [%x, %x)\n", cfg->varinfo [idx]->dreg, cfg->varinfo [idx]->dreg, block_from, last_use [idx]));
+ mono_linterval_add_range (cfg, vi->interval, block_from, last_use [idx]);
+ }
+ }
+ }
+
+ /*
+ * Arguments need to have their live ranges extended to the beginning of
+ * the method to account for the arg reg/memory -> global register copies
+ * in the prolog (bug #74992).
+ */
+ for (i = 0; i < max_vars; i ++) {
+ MonoMethodVar *vi = MONO_VARINFO (cfg, i);
+ if (cfg->varinfo [vi->idx]->opcode == OP_ARG)
+ mono_linterval_add_range (cfg, vi->interval, 0, 1);
+ }
+
+#if 0
+ for (idx = 0; idx < max_vars; ++idx) {
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+
+ LIVENESS_DEBUG (printf ("LIVENESS R%d: ", cfg->varinfo [idx]->dreg));
+ LIVENESS_DEBUG (mono_linterval_print (vi->interval));
+ LIVENESS_DEBUG (printf ("\n"));
+ }
+#endif
+
+ g_free (last_use);
+}
+
+#endif
+
+#define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
+
+static inline void
+update_liveness_gc (MonoCompile *cfg, MonoBasicBlock *bb, MonoInst *ins, gint32 *last_use, MonoMethodVar **vreg_to_varinfo, GSList **callsites)
+{
+ if (ins->opcode == OP_GC_LIVENESS_DEF || ins->opcode == OP_GC_LIVENESS_USE) {
+ int vreg = ins->inst_c1;
+ MonoMethodVar *vi = vreg_to_varinfo [vreg];
+ int idx = vi->idx;
+ int pc_offset = ins->backend.pc_offset;
+
+ LIVENESS_DEBUG (printf ("\t%x: ", pc_offset); mono_print_ins (ins));
+
+ if (ins->opcode == OP_GC_LIVENESS_DEF) {
+ if (last_use [idx] > 0) {
+ LIVENESS_DEBUG (printf ("\tadd range to R%d: [%x, %x)\n", vreg, pc_offset, last_use [idx]));
+ last_use [idx] = 0;
+ }
+ } else {
+ if (last_use [idx] == 0) {
+ LIVENESS_DEBUG (printf ("\tlast use of R%d set to %x\n", vreg, pc_offset));
+ last_use [idx] = pc_offset;
+ }
+ }
+ } else if (ins->opcode == OP_GC_PARAM_SLOT_LIVENESS_DEF) {
+ GCCallSite *last;
+
+ /* Add it to the last callsite */
+ g_assert (*callsites);
+ last = (*callsites)->data;
+ last->param_slots = g_slist_prepend_mempool (cfg->mempool, last->param_slots, ins);
+ } else if (ins->flags & MONO_INST_GC_CALLSITE) {
+ GCCallSite *callsite = mono_mempool_alloc0 (cfg->mempool, sizeof (GCCallSite));
+ int i;
+
+ LIVENESS_DEBUG (printf ("\t%x: ", ins->backend.pc_offset); mono_print_ins (ins));
+ LIVENESS_DEBUG (printf ("\t\tlive: "));
+
+ callsite->bb = bb;
+ callsite->liveness = mono_mempool_alloc0 (cfg->mempool, ALIGN_TO (cfg->num_varinfo, 8) / 8);
+ callsite->pc_offset = ins->backend.pc_offset;
+ for (i = 0; i < cfg->num_varinfo; ++i) {
+ if (last_use [i] != 0) {
+ LIVENESS_DEBUG (printf ("R%d", MONO_VARINFO (cfg, i)->vreg));
+ callsite->liveness [i / 8] |= (1 << (i % 8));
+ }
+ }
+ LIVENESS_DEBUG (printf ("\n"));
+ *callsites = g_slist_prepend_mempool (cfg->mempool, *callsites, callsite);
+ }
+}
+
+static inline int
+get_vreg_from_var (MonoCompile *cfg, MonoInst *var)
+{
+ if (var->opcode == OP_REGVAR)
+ /* dreg contains a hreg, but inst_c0 still contains the var index */
+ return MONO_VARINFO (cfg, var->inst_c0)->vreg;
+ else
+ /* dreg still contains the vreg */
+ return var->dreg;
+}
+
+/*
+ * mono_analyze_liveness_gc:
+ *
+ * Compute liveness bitmaps for each call site.
+ * This function is a modified version of mono_analyze_liveness2 ().
+ */
+void
+mono_analyze_liveness_gc (MonoCompile *cfg)
+{
+ int idx, i, j, nins, max, max_vars, block_from, block_to, pos, reverse_len;
+ gint32 *last_use;
+ MonoInst **reverse;
+ MonoMethodVar **vreg_to_varinfo = NULL;
+ MonoBasicBlock *bb;
+ GSList *callsites;
+
+ LIVENESS_DEBUG (printf ("\n------------ GC LIVENESS: ----------\n"));
+
+ max_vars = cfg->num_varinfo;
+ last_use = g_new0 (gint32, max_vars);
+
+ /*
+ * var->inst_c0 no longer contains the variable index, so compute a mapping now.
+ */
+ vreg_to_varinfo = g_new0 (MonoMethodVar*, cfg->next_vreg);
+ for (idx = 0; idx < max_vars; ++idx) {
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+
+ vreg_to_varinfo [vi->vreg] = vi;
+ }
+
+ reverse_len = 1024;
+ reverse = mono_mempool_alloc (cfg->mempool, sizeof (MonoInst*) * reverse_len);
+
+ for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
+ MonoInst *ins;
+
+ block_from = bb->real_native_offset;
+ block_to = bb->native_offset + bb->native_length;
+
+ LIVENESS_DEBUG (printf ("GC LIVENESS BB%d:\n", bb->block_num));
+
+ if (!bb->code)
+ continue;
+
+ memset (last_use, 0, max_vars * sizeof (gint32));
+
+ /* For variables in bb->live_out, set last_use to block_to */
+
+ max = ((max_vars + (BITS_PER_CHUNK -1)) / BITS_PER_CHUNK);
+ for (j = 0; j < max; ++j) {
+ gsize bits_out;
+ int k;
+
+ if (!bb->live_out_set)
+ /* The variables used in this bblock are volatile anyway */
+ continue;
+
+ bits_out = mono_bitset_get_fast (bb->live_out_set, j);
+ k = (j * BITS_PER_CHUNK);
+ while (bits_out) {
+ if ((bits_out & 1) && cfg->varinfo [k]->flags & MONO_INST_GC_TRACK) {
+ int vreg = get_vreg_from_var (cfg, cfg->varinfo [k]);
+ LIVENESS_DEBUG (printf ("Var R%d live at exit, last_use set to %x.\n", vreg, block_to));
+ last_use [k] = block_to;
+ }
+ bits_out >>= 1;
+ k ++;
+ }
+ }
+
+ for (nins = 0, pos = block_from, ins = bb->code; ins; ins = ins->next, ++nins, ++pos) {
+ if (nins >= reverse_len) {
+ int new_reverse_len = reverse_len * 2;
+ MonoInst **new_reverse = mono_mempool_alloc (cfg->mempool, sizeof (MonoInst*) * new_reverse_len);
+ memcpy (new_reverse, reverse, sizeof (MonoInst*) * reverse_len);
+ reverse = new_reverse;
+ reverse_len = new_reverse_len;
+ }
+
+ reverse [nins] = ins;
+ }
+
+ /* Process instructions backwards */
+ callsites = NULL;
+ for (i = nins - 1; i >= 0; --i) {
+ MonoInst *ins = (MonoInst*)reverse [i];
+
+ update_liveness_gc (cfg, bb, ins, last_use, vreg_to_varinfo, &callsites);
+ }
+ /* The callsites should already be sorted by pc offset because we added them backwards */
+ bb->gc_callsites = callsites;
+ }
+
+ g_free (last_use);
+ g_free (vreg_to_varinfo);
+}
+
+#endif /* DISABLE_JIT */