node_is_in_irgs_storage() function added

[r968]

diff --git a/ir/ir/irgraph.c b/ir/ir/irgraph.c
index c394b63..c4d6c20 100644 (file)
--- a/ir/ir/irgraph.c
+++ b/ir/ir/irgraph.c
@@ -422,6 +422,27 @@ struct obstack *get_irg_obstack(ir_graph *irg) {
   return irg->obst;
 }
 
+/*
+ * Returns true if the node n is allocated on the storage of graph irg.
+ *
+ * Implementation is GLIBC specific as is uses the internal _obstack_chunk implementation.
+ */
+int node_is_in_irgs_storage(ir_graph *irg, ir_node *n)
+{
+  struct _obstack_chunk        *p;
+
+  /*
+   * checks wheater the ir_node pointer i on the obstack.
+   * A more sophisticated chaeck would test the "whole" ir_node
+   */
+  for (p = irg->obst->chunk; p; p = p->prev) {
+    if (((char *)p->contents <= (char *)n) && ((char *)n < (char *)p->limit))
+      return 1;
+  }
+
+  return 0;
+}
+
 irg_phase_state
 get_irg_phase_state (ir_graph *irg) {
   return irg->phase_state;

diff --git a/ir/ir/irgraph_t.h b/ir/ir/irgraph_t.h
index af39b5a..6aeb1b7 100644 (file)
--- a/ir/ir/irgraph_t.h
+++ b/ir/ir/irgraph_t.h
@@ -84,10 +84,24 @@ void init_irgraph(void);
    Must look like a correct irg, spare everything else. */
 ir_graph *new_const_code_irg(void);
 
+/**
+ * Set the pinned state of a graph.
+ *
+ * @irg                the IR graph
+ * @p          new pin state
+ */
 INLINE void
 set_irg_pinned (ir_graph *irg, op_pinned p);
 
 /** Returns the obstack associated with the graph. */
 struct obstack *get_irg_obstack(ir_graph *irg);
 
+/**
+ * Returns true if the node n is allocated on the storage of graph irg.
+ *
+ * @param irg  the IR graph
+ * @param n    the IR node
+ */
+int node_is_in_irgs_storage(ir_graph *irg, ir_node *n);
+
 # endif /* _IRGRAPH_T_H_ */