}
}
-#ifdef ENABLE_LIVENESS2
-
-#if 0
-#define LIVENESS_DEBUG(a) do { a; } while (0)
+#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)
{
}
#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, rem, 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 */
+
+ rem = max_vars % BITS_PER_CHUNK;
+ 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);
+}
+
projects / mono.git / blobdiff