From: Sebastian Hack <hack@ipd.info.uni-karlsruhe.de>
Date: Wed, 10 May 2006 16:34:43 +0000 (+0000)
Subject: Added index -> node map to irgs
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=6708a4bc2bbc035dcc84752a1e34c2edeef07c2d;p=libfirm

Added index -> node map to irgs

[r7719]
---

diff --git a/ir/ir/irgraph.c b/ir/ir/irgraph.c
index f9454a1e8..810007bcb 100644
--- a/ir/ir/irgraph.c
+++ b/ir/ir/irgraph.c
@@ -37,6 +37,8 @@
 #include "iredges_t.h"
 #include "type_t.h"
 
+#define INITIAL_IDX_IRN_MAP_SIZE 1024
+
 /**
  * Indicates, whether additional data can be registered to graphs.
  * If set to 1, this is not possible anymore.
@@ -138,6 +140,10 @@ new_r_ir_graph (entity *ent, int n_loc)
 
   edges_init_graph(res);
 
+  /* initialize the idx->node map. */
+  res->idx_irn_map = NEW_ARR_F(ir_node *, INITIAL_IDX_IRN_MAP_SIZE);
+  memset(res->idx_irn_map, 0, INITIAL_IDX_IRN_MAP_SIZE * sizeof(res->idx_irn_map[0]));
+
   /* inform statistics here, as blocks will be already build on this graph */
   hook_new_graph(res, ent);
 
@@ -267,6 +273,10 @@ ir_graph *new_const_code_irg(void) {
 
   res = alloc_graph();
 
+  /* initialize the idx->node map. */
+  res->idx_irn_map = NEW_ARR_F(ir_node *, INITIAL_IDX_IRN_MAP_SIZE);
+  memset(res->idx_irn_map, 0, INITIAL_IDX_IRN_MAP_SIZE * sizeof(res->idx_irn_map[0]));
+
   /* inform statistics here, as blocks will be already build on this graph */
   hook_new_graph(res, NULL);
 
diff --git a/ir/ir/irgraph_t.h b/ir/ir/irgraph_t.h
index 19aaef3c5..034d1afe6 100644
--- a/ir/ir/irgraph_t.h
+++ b/ir/ir/irgraph_t.h
@@ -141,7 +141,8 @@ struct ir_graph {
   unsigned long block_visited;       /**< same as visited, for a complete block */
   unsigned estimated_node_count;     /**< estimated number of nodes in this graph,
                                           updated after every walk */
-  irg_edge_info_t edge_info;  /**< edge info for automatic outs */
+  irg_edge_info_t edge_info;         /**< edge info for automatic outs */
+  ir_node **idx_irn_map;             /**< Array mapping node indexes to nodes. */
 
 #ifdef DEBUG_libfirm
   int             n_outs;            /**< Size wasted for outs */
@@ -524,11 +525,20 @@ _get_irg_estimated_node_cnt(const ir_graph *irg) {
 }
 
 /**
- * Returns the next IR node index for the given graph.
+ * Allocates a new idx in the irg for the node and adds the irn to the idx -> irn map.
+ * @param irg The graph.
+ * @param irn The node.
+ * @return    The index allocated for the node.
  */
 static INLINE unsigned
-get_irg_next_node_idx(ir_graph *irg) {
-  return irg->last_node_idx++;
+irg_register_node_idx(ir_graph *irg, ir_node *irn)
+{
+	unsigned idx = irg->last_node_idx++;
+	if(idx >= (unsigned) ARR_LEN(irg->idx_irn_map))
+		ARR_RESIZE(ir_node *, irg->idx_irn_map, idx + 1);
+
+	irg->idx_irn_map[idx] = irn;
+	return idx;
 }
 
 /**
@@ -537,9 +547,24 @@ get_irg_next_node_idx(ir_graph *irg) {
  */
 static INLINE void
 irg_kill_node(ir_graph *irg, ir_node *n) {
-  if (get_irn_idx(n) + 1 == irg->last_node_idx)
-    --irg->last_node_idx;
-  obstack_free(irg->obst, n);
+	unsigned idx = get_irn_idx(n);
+	if (idx + 1 == irg->last_node_idx)
+		--irg->last_node_idx;
+	irg->idx_irn_map[idx] = NULL;
+	obstack_free(irg->obst, n);
+}
+
+/**
+ * Get the node for an index.
+ * @param irg The graph.
+ * @param idx The index you want the node for.
+ * @return    The node with that index or NULL, if there is no node with that index.
+ * @note      The node you got might be dead.
+ */
+static INLINE ir_node *
+get_idx_irn(ir_graph *irg, unsigned idx) {
+	assert(idx < (unsigned) ARR_LEN(irg->idx_irn_map));
+	return irg->idx_irn_map[idx];
 }
 
 #define get_interprocedural_view()            _get_interprocedural_view()
diff --git a/ir/ir/irnode.c b/ir/ir/irnode.c
index 904bd7110..37f320e43 100644
--- a/ir/ir/irnode.c
+++ b/ir/ir/irnode.c
@@ -142,7 +142,7 @@ new_ir_node (dbg_info *db, ir_graph *irg, ir_node *block, ir_op *op, ir_mode *mo
   res->op       = op;
   res->mode     = mode;
   res->visited  = 0;
-  res->node_idx = get_irg_next_node_idx(irg);
+  res->node_idx = irg_register_node_idx(irg, res);
   res->link     = NULL;
   if (arity < 0) {
     res->in = NEW_ARR_F (ir_node *, 1);  /* 1: space for block */