X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firgmod.h;h=57f2e1dd625f80ea0301c2effee22f1ef40f9bff;hb=0e9428a1fd32b6084e0c561fa8056912069613d9;hp=1d54b30df364e0f0b438868ca2ea26d1b91a5407;hpb=45a9397451c25fb527c32c87f64ffefc72015c81;p=libfirm

diff --git a/ir/ir/irgmod.h b/ir/ir/irgmod.h
index 1d54b30df..57f2e1dd6 100644
--- a/ir/ir/irgmod.h
+++ b/ir/ir/irgmod.h
@@ -6,16 +6,43 @@
 ** irgmod.h: ir graph modification
 */
 
-# include "irnode.h"
+# ifndef _IRGMOD_H_
+# define _IRGMOD_H_
 
+# include "irnode.h"
 
-/* Turns a node into a "useless" Tuple.  The Tuple just forms a tuple
-   from several inputs.  The tuples predecessors have to be
-   set by hand.
+/* Turns a node into a "useless" Tuple.  The Tuple node just forms a tuple
+   from several inputs.  The predecessors of the tuple have to be
+   set by hand.  The block predecessor automatically remains the same.
    This is useful if a node returning a tuple is removed, but the Projs
    extracting values from the tuple are not available. */
 void turn_into_tuple (ir_node *node, int arity);
 
-/* Exchanges two nodes by conserving edges leaving old (i.e., pointers)
-   pointing to old. */
+/* Exchanges two nodes by conserving edges leaving old (i.e., pointers
+   pointing to old).  Turns the old node into an Id. Requires that
+   current_ir_graph is set properly. */
 inline void exchange (ir_node *old, ir_node *new);
+
+/* Walks over the passed ir graph and collects all Phi nodes as a
+   list built with the link field in their corresponding block.
+   Further it collects all Proj nodes in a list of the node producing
+   the tuple. In case of nested tuples the Projs are collected in the
+   node producing the outermost Tuple. */
+void collect_phiprojs(ir_graph *irg);
+
+/* Parts a block into two.  This is useful to insert other blocks within a
+   given block.
+   Adds a new block (new_block) in the control flow before the block
+   (old_block) of node.  Moves node and its predecessors from old_block to
+   new_block.  Moves all Projs that depend on moved nodes and are in old_block
+   to new_block. Moves all Phi nodes from old_block to new_block.  To achieve
+   this the routine assumes that all Phi nodes are in a list (using the link
+   field) in the link field of old_block.  Further it assumes that all Proj nodes
+   are accessible by the link field of the nodes producing the Tuple. This
+   can be established by collect_phiprojs().  part_block conserves this property.
+   Adds a Jmp node to new_block that jumps to old_block.
+   Assumes that node is contained in current_ir_graph.  Sets current_block in
+   this ir_graph to new_block. */
+void part_block(ir_node *node);
+
+#endif /* ifndef _IRGMOD_H_ */