#include "mini.h"
#include "inssel.h"
+#include "aliasing.h"
//#define DEBUG_LIVENESS
-
extern guint8 mono_burg_arity [];
/* mono_bitset_mp_new:
return mono_bitset_mem_new (mem, max_size, MONO_BITSET_DONT_FREE);
}
-#ifdef DEBUG_LIVENESS
-static void
+G_GNUC_UNUSED static void
mono_bitset_print (MonoBitSet *set)
{
int i;
printf ("%d, ", i);
}
- printf ("}");
+ printf ("}\n");
}
-#endif
-static void
+static inline void
update_live_range (MonoCompile *cfg, int idx, int block_dfn, int tree_pos)
{
MonoLiveRange *range = &MONO_VARINFO (cfg, idx)->range;
if (arity > 1)
update_gen_kill_set (cfg, bb, inst->inst_i1, inst_num);
- if (inst->ssa_op == MONO_SSA_LOAD) {
- int idx = inst->inst_i0->inst_c0;
- MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
- g_assert (idx < max_vars);
- update_live_range (cfg, idx, bb->dfn, inst_num);
- if (!mono_bitset_test (bb->kill_set, idx))
- mono_bitset_set (bb->gen_set, idx);
- vi->spill_costs += 1 + (bb->nesting * 2);
- } else if (inst->ssa_op == MONO_SSA_STORE) {
- int idx = inst->inst_i0->inst_c0;
- MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
- g_assert (idx < max_vars);
- g_assert (inst->inst_i1->opcode != OP_PHI);
-
- update_live_range (cfg, idx, bb->dfn, inst_num);
- mono_bitset_set (bb->kill_set, idx);
- vi->spill_costs += 1 + (bb->nesting * 2);
+ if ((inst->ssa_op & MONO_SSA_LOAD_STORE) || (inst->opcode == OP_DUMMY_STORE)) {
+ MonoLocalVariableList* affected_variables;
+ MonoLocalVariableList local_affected_variable;
+
+ if (cfg->aliasing_info == NULL) {
+ if ((inst->ssa_op == MONO_SSA_LOAD) || (inst->ssa_op == MONO_SSA_STORE) || (inst->opcode == OP_DUMMY_STORE)) {
+ local_affected_variable.variable_index = inst->inst_i0->inst_c0;
+ local_affected_variable.next = NULL;
+ affected_variables = &local_affected_variable;
+ } else {
+ affected_variables = NULL;
+ }
+ } else {
+ affected_variables = mono_aliasing_get_affected_variables_for_inst_traversing_code (cfg->aliasing_info, inst);
+ }
+
+ if (inst->ssa_op & MONO_SSA_LOAD) {
+ MonoLocalVariableList* affected_variable = affected_variables;
+ while (affected_variable != NULL) {
+ int idx = affected_variable->variable_index;
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+ g_assert (idx < max_vars);
+ if ((bb->region != -1) && !MONO_BBLOCK_IS_IN_REGION (bb, MONO_REGION_TRY)) {
+ /*
+ * Variables used in exception regions can't be allocated to
+ * registers.
+ */
+ cfg->varinfo [vi->idx]->flags |= MONO_INST_VOLATILE;
+ }
+ update_live_range (cfg, idx, bb->dfn, inst_num);
+ if (!mono_bitset_test (bb->kill_set, idx))
+ mono_bitset_set (bb->gen_set, idx);
+ if (inst->ssa_op == MONO_SSA_LOAD)
+ vi->spill_costs += 1 + (bb->nesting * 2);
+
+ affected_variable = affected_variable->next;
+ }
+ } else if ((inst->ssa_op == MONO_SSA_STORE) || (inst->opcode == OP_DUMMY_STORE)) {
+ MonoLocalVariableList* affected_variable = affected_variables;
+ while (affected_variable != NULL) {
+ int idx = affected_variable->variable_index;
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+ g_assert (idx < max_vars);
+ //if (arity > 0)
+ //g_assert (inst->inst_i1->opcode != OP_PHI);
+ if ((bb->region != -1) && !MONO_BBLOCK_IS_IN_REGION (bb, MONO_REGION_TRY)) {
+ /*
+ * Variables used in exception regions can't be allocated to
+ * registers.
+ */
+ cfg->varinfo [vi->idx]->flags |= MONO_INST_VOLATILE;
+ }
+ update_live_range (cfg, idx, bb->dfn, inst_num);
+ mono_bitset_set (bb->kill_set, idx);
+ if (inst->ssa_op == MONO_SSA_STORE)
+ vi->spill_costs += 1 + (bb->nesting * 2);
+
+ affected_variable = affected_variable->next;
+ }
+ }
+ } else if (inst->opcode == CEE_JMP) {
+ /* Keep arguments live! */
+ int i;
+ for (i = 0; i < cfg->num_varinfo; i++) {
+ if (cfg->varinfo [i]->opcode == OP_ARG) {
+ if (!mono_bitset_test (bb->kill_set, i))
+ mono_bitset_set (bb->gen_set, i);
+ }
+ }
+ }
+}
+
+static void
+update_volatile (MonoCompile *cfg, MonoBasicBlock *bb, MonoInst *inst, int inst_num)
+{
+ int arity = mono_burg_arity [inst->opcode];
+ int max_vars = cfg->num_varinfo;
+
+ if (arity)
+ update_volatile (cfg, bb, inst->inst_i0, inst_num);
+
+ if (arity > 1)
+ update_volatile (cfg, bb, inst->inst_i1, inst_num);
+
+ if (inst->ssa_op & MONO_SSA_LOAD_STORE) {
+ MonoLocalVariableList* affected_variables;
+ MonoLocalVariableList local_affected_variable;
+
+ if (cfg->aliasing_info == NULL) {
+ if ((inst->ssa_op == MONO_SSA_LOAD) || (inst->ssa_op == MONO_SSA_STORE)) {
+ local_affected_variable.variable_index = inst->inst_i0->inst_c0;
+ local_affected_variable.next = NULL;
+ affected_variables = &local_affected_variable;
+ } else {
+ affected_variables = NULL;
+ }
+ } else {
+ affected_variables = mono_aliasing_get_affected_variables_for_inst_traversing_code (cfg->aliasing_info, inst);
+ }
+
+ while (affected_variables != NULL) {
+ int idx = affected_variables->variable_index;
+ MonoMethodVar *vi = MONO_VARINFO (cfg, idx);
+ g_assert (idx < max_vars);
+ cfg->varinfo [vi->idx]->flags |= MONO_INST_VOLATILE;
+
+ affected_variables = affected_variables->next;
+ }
}
}
+static void
+visit_bb (MonoCompile *cfg, MonoBasicBlock *bb, GSList **visited)
+{
+ int i, tree_num;
+ MonoInst *inst;
+
+ if (g_slist_find (*visited, bb))
+ return;
+
+ if (cfg->aliasing_info != NULL)
+ mono_aliasing_initialize_code_traversal (cfg->aliasing_info, bb);
+
+ for (tree_num = 0, inst = bb->code; inst; inst = inst->next, tree_num++) {
+ update_volatile (cfg, bb, inst, tree_num);
+ }
+
+ *visited = g_slist_append (*visited, bb);
+
+ /*
+ * Need to visit all bblocks reachable from this one since they can be
+ * reached during exception handling.
+ */
+ for (i = 0; i < bb->out_count; ++i) {
+ visit_bb (cfg, bb->out_bb [i], visited);
+ }
+}
+
+static void
+handle_exception_clauses (MonoCompile *cfg)
+{
+ MonoBasicBlock *bb;
+ GSList *visited = NULL;
+
+ /*
+ * Variables in exception handler register cannot be allocated to registers
+ * so make them volatile. See bug #42136. This will not be neccessary when
+ * the back ends could guarantee that the variables will be in the
+ * correct registers when a handler is called.
+ * This includes try blocks too, since a variable in a try block might be
+ * accessed after an exception handler has been run.
+ */
+ for (bb = cfg->bb_entry; bb; bb = bb->next_bb) {
+
+ if (bb->region == -1 || MONO_BBLOCK_IS_IN_REGION (bb, MONO_REGION_TRY))
+ continue;
+
+ visit_bb (cfg, bb, &visited);
+ }
+ g_slist_free (visited);
+}
+
/* generic liveness analysis code. CFG specific parts are
* in update_gen_kill_set()
*/
void
mono_analyze_liveness (MonoCompile *cfg)
{
- MonoBitSet *old_live_in_set, *old_live_out_set;
+ MonoBitSet *old_live_in_set, *old_live_out_set, *tmp_in_set;
gboolean changes;
int i, j, max_vars = cfg->num_varinfo;
+ int iterations, out_iter, in_iter;
+ gboolean *changed_in, *changed_out, *new_changed_in, *in_worklist;
+ MonoBasicBlock **worklist;
+ guint32 l_begin, l_end;
+ static int count = 0;
#ifdef DEBUG_LIVENESS
- printf ("LIVENLESS %s\n", mono_method_full_name (cfg->method, TRUE));
+ printf ("LIVENESS %s\n", mono_method_full_name (cfg->method, TRUE));
#endif
g_assert (!(cfg->comp_done & MONO_COMP_LIVENESS));
bb->live_in_set = mono_bitset_mp_new (cfg->mempool, max_vars);
bb->live_out_set = mono_bitset_mp_new (cfg->mempool, max_vars);
}
+ for (i = 0; i < max_vars; i ++) {
+ MONO_VARINFO (cfg, i)->range.first_use.abs_pos = ~ 0;
+ MONO_VARINFO (cfg, i)->range.last_use .abs_pos = 0;
+ MONO_VARINFO (cfg, i)->spill_costs = 0;
+ }
for (i = 0; i < cfg->num_bblocks; ++i) {
MonoBasicBlock *bb = cfg->bblocks [i];
MonoInst *inst;
int tree_num;
+ if (cfg->aliasing_info != NULL)
+ mono_aliasing_initialize_code_traversal (cfg->aliasing_info, bb);
+
for (tree_num = 0, inst = bb->code; inst; inst = inst->next, tree_num++) {
- //mono_print_tree (inst); printf ("\n");
+#ifdef DEBUG_LIVENESS
+ mono_print_tree (inst); printf ("\n");
+#endif
update_gen_kill_set (cfg, bb, inst, tree_num);
}
printf ("BB%d, ", bb->out_bb [j]->block_num);
printf (")\n");
- printf ("GEN BB%d: ", bb->block_num); mono_bitset_print (bb->gen_set); printf ("\n");
- printf ("KILL BB%d: ", bb->block_num); mono_bitset_print (bb->kill_set); printf ("\n");
+ printf ("GEN BB%d: ", bb->block_num); mono_bitset_print (bb->gen_set);
+ printf ("KILL BB%d: ", bb->block_num); mono_bitset_print (bb->kill_set);
#endif
}
old_live_in_set = mono_bitset_new (max_vars, 0);
old_live_out_set = mono_bitset_new (max_vars, 0);
-
- do {
- changes = FALSE;
+ tmp_in_set = mono_bitset_new (max_vars, 0);
+ changed_in = g_new0 (gboolean, cfg->num_bblocks + 1);
+ changed_out = g_new0 (gboolean, cfg->num_bblocks + 1);
+ in_worklist = g_new0 (gboolean, cfg->num_bblocks + 1);
+ new_changed_in = g_new0 (gboolean, cfg->num_bblocks + 1);
+
+ for (i = 0; i < cfg->num_bblocks + 1; ++i) {
+ changed_in [i] = TRUE;
+ changed_out [i] = TRUE;
+ }
- for (i = cfg->num_bblocks - 1; i >= 0; i--) {
- MonoBasicBlock *bb = cfg->bblocks [i];
+ count ++;
- mono_bitset_copyto (bb->live_in_set, old_live_in_set);
- mono_bitset_copyto (bb->live_out_set, old_live_out_set);
+ worklist = g_new0 (MonoBasicBlock *, cfg->num_bblocks + 1);
+ l_begin = 0;
+ l_end = 0;
- mono_bitset_copyto (bb->live_out_set, bb->live_in_set);
- mono_bitset_sub (bb->live_in_set, bb->kill_set);
- mono_bitset_union (bb->live_in_set, bb->gen_set);
+ for (i = cfg->num_bblocks - 1; i >= 0; i--) {
+ MonoBasicBlock *bb = cfg->bblocks [i];
- mono_bitset_clear_all (bb->live_out_set);
-
- for (j = 0; j < bb->out_count; j++)
- mono_bitset_union (bb->live_out_set, bb->out_bb [j]->live_in_set);
+ worklist [l_end ++] = bb;
+ in_worklist [bb->dfn] = TRUE;
+ }
- if (!(mono_bitset_equal (old_live_in_set, bb->live_in_set) &&
- mono_bitset_equal (old_live_out_set, bb->live_out_set)))
- changes = TRUE;
+ iterations = 0;
+ out_iter = 0;
+ in_iter = 0;
+ do {
+ changes = FALSE;
+ iterations ++;
+
+ while (l_begin != l_end) {
+ MonoBasicBlock *bb = worklist [l_begin ++];
+
+ in_worklist [bb->dfn] = FALSE;
+
+ if (l_begin == cfg->num_bblocks + 1)
+ l_begin = 0;
+
+ if (bb->out_count > 0) {
+ out_iter ++;
+ mono_bitset_copyto (bb->live_out_set, old_live_out_set);
+
+ for (j = 0; j < bb->out_count; j++) {
+ MonoBasicBlock *out_bb = bb->out_bb [j];
+
+ mono_bitset_copyto (out_bb->live_out_set, tmp_in_set);
+ mono_bitset_sub (tmp_in_set, out_bb->kill_set);
+ mono_bitset_union (tmp_in_set, out_bb->gen_set);
+
+ mono_bitset_union (bb->live_out_set, tmp_in_set);
+
+ }
+
+ changed_out [bb->dfn] = !mono_bitset_equal (old_live_out_set, bb->live_out_set);
+ if (changed_out [bb->dfn]) {
+ for (j = 0; j < bb->in_count; j++) {
+ MonoBasicBlock *in_bb = bb->in_bb [j];
+ /*
+ * Some basic blocks do not seem to be in the
+ * cfg->bblocks array...
+ */
+ if (in_bb->live_in_set)
+ if (!in_worklist [in_bb->dfn]) {
+ worklist [l_end ++] = in_bb;
+ if (l_end == cfg->num_bblocks + 1)
+ l_end = 0;
+ in_worklist [in_bb->dfn] = TRUE;
+ }
+ }
+
+ changes = TRUE;
+ }
+ }
}
-
} while (changes);
+ //printf ("IT: %d %d %d.\n", iterations, in_iter, out_iter);
+
mono_bitset_free (old_live_in_set);
mono_bitset_free (old_live_out_set);
+ mono_bitset_free (tmp_in_set);
- for (i = 0; i < cfg->num_bblocks; ++i) {
+ g_free (changed_in);
+ g_free (changed_out);
+ g_free (new_changed_in);
+ g_free (worklist);
+ g_free (in_worklist);
+
+ for (i = cfg->num_bblocks - 1; i >= 0; i--) {
MonoBasicBlock *bb = cfg->bblocks [i];
- for (j = max_vars - 1; j >= 0; j--) {
-
- if (mono_bitset_test (bb->live_in_set, j))
- update_live_range (cfg, j, bb->dfn, 0);
+ mono_bitset_copyto (bb->live_out_set, bb->live_in_set);
+ mono_bitset_sub (bb->live_in_set, bb->kill_set);
+ mono_bitset_union (bb->live_in_set, bb->gen_set);
+ }
+
+ /*
+ * This code can be slow for large methods so inline the calls to
+ * mono_bitset_test.
+ */
+ for (i = 0; i < cfg->num_bblocks; ++i) {
+ MonoBasicBlock *bb = cfg->bblocks [i];
+ guint32 rem;
+
+ rem = max_vars % 32;
+ for (j = 0; j < (max_vars / 32) + 1; ++j) {
+ guint32 bits_in;
+ guint32 bits_out;
+ int k, nbits;
+
+ if (j > (max_vars / 32))
+ break;
+ else
+ if (j == (max_vars / 32))
+ nbits = rem;
+ else
+ nbits = 32;
+
+ bits_in = mono_bitset_test_bulk (bb->live_in_set, j * 32);
+ bits_out = mono_bitset_test_bulk (bb->live_out_set, j * 32);
+ for (k = 0; k < nbits; ++k) {
+ if (bits_in & (1 << k))
+ update_live_range (cfg, (j * 32) + k, bb->dfn, 0);
+ if (bits_out & (1 << k))
+ update_live_range (cfg, (j * 32) + k, bb->dfn, 0xffff);
+ }
+ }
+ }
- if (mono_bitset_test (bb->live_out_set, j))
- update_live_range (cfg, j, bb->dfn, 0xffff);
- }
- }
+ /* todo: remove code when we have verified that the liveness for try/catch blocks
+ * works perfectly
+ */
+ /*
+ * Currently, this can't be commented out since exception blocks are not
+ * processed during liveness analysis.
+ */
+ handle_exception_clauses (cfg);
+
+ /*
+ * 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)
+ vi->range.first_use.abs_pos = 0;
+ }
#ifdef DEBUG_LIVENESS
for (i = cfg->num_bblocks - 1; i >= 0; i--) {
printf ("LIVE IN BB%d: ", bb->block_num);
mono_bitset_print (bb->live_in_set);
- printf ("\n");
printf ("LIVE OUT BB%d: ", bb->block_num);
mono_bitset_print (bb->live_out_set);
- printf ("\n");
}
#endif
}
-
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