Converted documentation to doxygen.

[libfirm] / ir / ir / irgmod.c

diff --git a/ir/ir/irgmod.c b/ir/ir/irgmod.c
index 8721103..5ec25d3 100644 (file)
--- a/ir/ir/irgmod.c
+++ b/ir/ir/irgmod.c
@@ -1,13 +1,26 @@
+
 /* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
-** All rights reserved.
-**
-** Authors: Martin Trapp, Christian Schaefer
-**
-** irgmod: ir graph modification
+* All rights reserved.
+*
+* Authors: Martin Trapp, Christian Schaefer
+*
+* irgmod: ir graph modification
 */
 
+/* $Id$ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+# include "irvrfy.h"
+# include "irflag.h"
+# include "irgwalk.h"
+# include "irnode_t.h"
+# include "irgraph_t.h"
 # include "irgmod.h"
 # include "array.h"
+# include "ircons.h"
 
 /* Turns a node into a "useless" Tuple.  The Tuple just forms a tuple
    from several inputs.
@@ -31,13 +44,124 @@ turn_into_tuple (ir_node *node, int arity)
 /* Insert irnode `new' in place of irnode `old'
    Since `new' may be bigger than `old' replace `old'
    by an op_Id which is smaller than everything */
-inline void
-exchange (ir_node *old, ir_node *new)
+INLINE void
+exchange (ir_node *old, ir_node *nw)
 {
   ir_node *block = old->in[0];
 
   old->op = op_Id;
   old->in = NEW_ARR_D (ir_node *, current_ir_graph->obst, 2);
   old->in[0] = block;
-  old->in[1] = new;
+  old->in[1] = nw;
+}
+
+/**********************************************************************/
+/*  Functionality for collect_phis                                     */
+/**********************************************************************/
+
+static void
+clear_link (ir_node *n, void *env) {
+  set_irn_link(n, NULL);
+}
+
+static void
+collect (ir_node *n, void *env) {
+  ir_node *pred;
+  if (get_irn_op(n) == op_Phi) {
+    set_irn_link(n, get_irn_link(get_nodes_Block(n)));
+    set_irn_link(get_nodes_Block(n), n);
+  }
+  if (get_irn_op(n) == op_Proj) {
+    pred = n;
+    while (get_irn_op(pred) == op_Proj)
+      pred = get_Proj_pred(pred);
+    set_irn_link(n, get_irn_link(pred));
+    set_irn_link(pred, n);
+  }
+}
+
+void collect_phiprojs(ir_graph *irg) {
+  ir_graph *rem;
+
+  /* Remember external state of current_ir_graph. */
+  rem = current_ir_graph;
+  current_ir_graph = irg;
+
+  irg_walk(get_irg_end(current_ir_graph), clear_link, collect, NULL);
+
+  current_ir_graph = rem;
+}
+
+
+/**********************************************************************/
+/*  Funcionality for part_block                                       */
+/**********************************************************************/
+
+/* Moves node and all predecessors of node from from_bl to to_bl.
+   Does not move predecessors of Phi nodes (or block nodes). */
+
+static void move (ir_node *node, ir_node *from_bl, ir_node *to_bl) {
+  int i;
+  ir_node *proj, *pred;
+
+  /* move this node */
+  set_nodes_Block(node, to_bl);
+
+  /* move its projs */
+  if (get_irn_mode(node) == mode_T) {
+    proj = get_irn_link(node);
+    while (proj) {
+      if (get_nodes_Block(proj) == from_bl)
+       set_nodes_Block(proj, to_bl);
+      proj = get_irn_link(proj);
+    }
+  }
+
+  /* recursion ... */
+  if (get_irn_op(node) == op_Phi) return;
+
+  for (i = 0; i < get_irn_arity(node); i++) {
+    pred = get_irn_n(node, i);
+    if (get_nodes_Block(pred) == from_bl)
+      move(pred, from_bl, to_bl);
+  }
+}
+
+void part_block(ir_node *node) {
+  ir_node *new_block;
+  ir_node *old_block;
+  ir_node *phi;
+
+  /* Turn off optimizations so that blocks are not merged again. */
+  int rem_opt = get_optimize();
+  set_optimize(0);
+
+  /* Transform the control flow */
+  old_block = get_nodes_Block(node);
+  new_block = new_Block(get_Block_n_cfgpreds(old_block),
+                       get_Block_cfgpred_arr(old_block));
+  set_irg_current_block(current_ir_graph, new_block);
+  {
+    ir_node *in[1];
+    in[0] = new_Jmp();
+    set_irn_in(old_block, 1, in);
+    irn_vrfy_irg(old_block, current_ir_graph);
+  }
+
+  /* move node and its predecessors to new_block */
+  move(node, old_block, new_block);
+
+  /* move Phi nodes to new_block */
+  phi = get_irn_link(old_block);
+  set_irn_link(new_block, phi);
+  set_irn_link(old_block, NULL);
+  while (phi) {
+    if(get_nodes_Block(phi) == old_block);   /* @@@ inlinening chokes on phis that don't
+                                              obey this condition.  How do they get into
+                                              the list??? Example: InterfaceIII */
+      set_nodes_Block(phi, new_block);
+    phi = get_irn_link(phi);
+  }
+
+  set_optimize(rem_opt);
 }