X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbelive.c;h=74dcf43d09e4233eef4b3796adfbb4e2cbc7ebc7;hb=8544304305897e5f2b5752fc243fd45c4f95a38c;hp=ae17a63381c7b1ba6e16d819c005df386279f856;hpb=e03dd955762d16d38fdec0e2d7c24bf36d0ecc2e;p=libfirm

diff --git a/ir/be/belive.c b/ir/be/belive.c
index ae17a6338..74dcf43d0 100644
--- a/ir/be/belive.c
+++ b/ir/be/belive.c
@@ -14,6 +14,9 @@
 
 #include "beutil.h"
 #include "belive_t.h"
+#include "besched_t.h"
+
+#define DBG_MODULE "firm.be.liveness"
 
 FIRM_IMPL2(is_live_in, int, const ir_node *, const ir_node *)
 FIRM_IMPL2(is_live_out, int, const ir_node *, const ir_node *)
@@ -27,16 +30,25 @@ void be_liveness_init(void)
   live_irg_data_offset = register_additional_graph_data(sizeof(irn_live_t));
 }
 
+/**
+ * Mark a node as live-in in a block.
+ */
 static INLINE void mark_live_in(ir_node *block, const ir_node *irn)
 {
   _get_or_set_live(block, irn, live_state_in);
 }
 
+/**
+ * Mark a node as live-out in a block.
+ */
 static INLINE void mark_live_out(ir_node *block, const ir_node *irn)
 {
   _get_or_set_live(block, irn, live_state_out | live_state_end);
 }
 
+/**
+ * Mark a node as live-end in a block.
+ */
 static INLINE void mark_live_end(ir_node *block, const ir_node *irn)
 {
   _get_or_set_live(block, irn, live_state_end);
@@ -143,6 +155,9 @@ static void liveness_for_node(ir_node *irn, void *env)
   del_pset(visited);
 }
 
+/**
+ * Compare two live entries.
+ */
 static int cmp_irn_live(const void *a, const void *b, size_t size)
 {
   const irn_live_t *p = a;
@@ -151,17 +166,61 @@ static int cmp_irn_live(const void *a, const void *b, size_t size)
   return !(p->block == q->block && p->irn == q->irn);
 }
 
+static int (*old_dump_block_func)(ir_node *self, FILE *F, dump_reason_t reason) = NULL;
+
+static int dump_block_func(ir_node *self, FILE *F, dump_reason_t reason)
+{
+	switch(reason) {
+	case dump_node_opcode_txt:
+		fprintf(F, get_irn_opname(self));
+		break;
+	case dump_node_mode_txt:
+		fprintf(F, get_irn_modename(self));
+		break;
+	case dump_node_nodeattr_txt:
+		break;
+	case dump_node_info_txt:
+		if(!get_irg_live_info(get_irn_irg(self))->live)
+			return 0;
+#if 0
+		fprintf(F, "liveness information:\n");
+		{
+			irn_live_t *li;
+			live_foreach(self, li) {
+				ir_fprintf(F, "%+F", li->irn);
+				if(live_is_in(li))
+					fprintf(F, " in");
+				if(live_is_end(li))
+					fprintf(F, " end");
+				if(live_is_out(li))
+					fprintf(F, " out");
+
+				fprintf(F, "\n");
+			}
+		}
+#endif
+	}
+
+	return 0;
+}
+
+/* Compute the inter block liveness for a graph. */
 void be_liveness(ir_graph *irg)
 {
   irg_live_info_t *live_info = get_irg_live_info(irg);
   if(live_info->live)
     del_set(live_info->live);
 
-
   live_info->live = new_set(cmp_irn_live, 8192);
   irg_walk_graph(irg, liveness_for_node, NULL, NULL);
+
+  old_dump_block_func     = op_Block->ops.dump_node;
+  op_Block->ops.dump_node = dump_block_func;
 }
 
+/**
+ * Pre-walker: dump liveness data to a file
+ */
 static void dump_liveness_walker(ir_node *bl, void *data)
 {
 	FILE *f = data;
@@ -185,11 +244,28 @@ static void dump_liveness_walker(ir_node *bl, void *data)
 	}
 }
 
+/* Dump the liveness information for a graph. */
 void be_liveness_dump(ir_graph *irg, FILE *f)
 {
 	irg_block_walk_graph(irg, dump_liveness_walker, NULL, f);
 }
 
+/* Dump the liveness information for a graph. */
+void be_liveness_dumpto(ir_graph *irg, const char *cls_name)
+{
+	FILE *f;
+	char buf[128];
+	ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", irg, cls_name);
+	if((f = fopen(buf, "wt")) != NULL) {
+		be_liveness_dump(irg, f);
+		fclose(f);
+	}
+}
+
+/**
+ * Walker: checks the every predecessors of a node dominate
+ * the note.
+ */
 static void dom_check(ir_node *irn, void *data)
 {
 	if(!is_Block(irn) && irn != get_irg_end(get_irn_irg(irn))) {
@@ -212,7 +288,64 @@ static void dom_check(ir_node *irn, void *data)
 	}
 }
 
+/* Check, if the SSA dominance property is fulfilled. */
 void be_check_dominance(ir_graph *irg)
 {
 	irg_walk_graph(irg, dom_check, NULL, NULL);
 }
+
+pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live)
+{
+	int i, n;
+	ir_node *x;
+	FIRM_DBG_REGISTER(firm_dbg_module_t *dbg, DBG_MODULE);
+
+	DBG((dbg, LEVEL_1, "%+F\n", irn));
+	for(x = pset_first(live); x; x = pset_next(live))
+		DBG((dbg, LEVEL_1, "\tlive: %+F\n", x));
+
+	if(arch_irn_consider_in_reg_alloc(arch_env, cls, irn))
+		pset_remove_ptr(live, irn);
+
+	for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+		ir_node *op = get_irn_n(irn, i);
+
+		if(arch_irn_consider_in_reg_alloc(arch_env, cls, op))
+			pset_insert_ptr(live, op);
+	}
+
+	return live;
+}
+
+pset *be_liveness_end_of_block(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live)
+{
+	irn_live_t *li;
+
+	live_foreach(bl, li) {
+		ir_node *irn = (ir_node *) li->irn;
+		if(live_is_end(li) && arch_irn_consider_in_reg_alloc(arch_env, cls, irn))
+			pset_insert_ptr(live, irn);
+	}
+
+	return live;
+}
+
+pset *be_liveness_nodes_live_at(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live)
+{
+	const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
+	ir_node *irn;
+
+	be_liveness_end_of_block(arch_env, cls, bl, live);
+	sched_foreach_reverse(bl, irn) {
+		/*
+		 * If we encounter the node we want to insert the Perm after,
+		 * exit immediately, so that this node is still live
+		 */
+		if(irn == pos)
+			return live;
+
+		be_liveness_transfer(arch_env, cls, irn, live);
+	}
+
+	return live;
+}