X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=ir%2Fana%2Firouts.c;h=dcff5fb65ec73b138873bb9564e66c67fbf781e7;hb=e97a86a5e90141c2cb4ccdc34195cab035627c3f;hp=bc5cbce043b35624d3bf028cec3abeecc6994ee1;hpb=382defb529c86fac61baacb80ce2d6ce3d5f88a9;p=libfirm

diff --git a/ir/ana/irouts.c b/ir/ana/irouts.c
index bc5cbce04..dcff5fb65 100644
--- a/ir/ana/irouts.c
+++ b/ir/ana/irouts.c
@@ -1,151 +1,223 @@
- /* Copyright (C) 2002 by Universitaet Karlsruhe
-** All rights reserved.
-**
-** Authors:  Goetz Lindenmaier
-**
-** irouts.c --- Compute out edges for ir nodes (also called def-use
-** edges).
-**
-*/
-
-/* $Id$ */
-
+/*
+ * This file is part of libFirm.
+ * Copyright (C) 2012 University of Karlsruhe.
+ */
+
+/**
+ * @file
+ * @brief    Compute and access out edges (also called def-use edges).
+ * @author   Goetz Lindenmaier, Michael Beck
+ * @date     1.2002
+ */
+#include "config.h"
+
+#include <string.h>
+
+#include "xmalloc.h"
 #include "irouts.h"
 #include "irnode_t.h"
-#include "irgraph_t.h"     /* To access irg->outs field (which is private to this module)
-			      without public access routine */
-
-/**********************************************************************/
-/** Accessing the out datastructures                                 **/
-/**********************************************************************/
-
-/* returns the number of successors of the node: */
-INLINE int get_irn_n_outs    (ir_node *node) {
-  return (int)(node->out[0]);
+#include "irgraph_t.h"
+#include "irprog_t.h"
+#include "irgwalk.h"
+#include "util.h"
+#include "irprintf.h"
+#include "error.h"
+#include "ircons.h"
+
+unsigned get_irn_n_outs(const ir_node *node)
+{
+	return node->o.out->n_edges;
 }
 
-/* Access successor n */
-INLINE ir_node *get_irn_out      (ir_node *node, int pos) {
-  assert(node);
-  assert(pos >= 0 && pos < get_irn_n_outs(node));
-  return node->out[pos+1];
+ir_node *get_irn_out(const ir_node *def, unsigned pos)
+{
+	assert(pos < get_irn_n_outs(def));
+	return def->o.out->edges[pos].use;
 }
 
-INLINE void set_irn_out      (ir_node *node, int pos, ir_node *out) {
-  assert(node && out);
-  assert(pos >= 0 && pos < get_irn_n_outs(node));
-  node->out[pos+1] = out;
+ir_node *get_irn_out_ex(const ir_node *def, unsigned pos, int *in_pos)
+{
+	assert(pos < get_irn_n_outs(def));
+	*in_pos = def->o.out->edges[pos].pos;
+	return def->o.out->edges[pos].use;
 }
 
-
-INLINE int get_Block_n_cfg_outs (ir_node *bl) {
-  int i, n_cfg_outs = 0;
-  assert(bl && (get_irn_op(bl) == op_Block));
-  for (i = 0; i < (int)bl->out[0]; i++)
-    if ((get_irn_mode(bl->out[i+1]) == mode_X) &&
-	(get_irn_op(bl->out[i+1]) != op_End)) n_cfg_outs++;
-  return n_cfg_outs;
+void set_irn_out(ir_node *def, unsigned pos, ir_node *use, int in_pos)
+{
+	assert(use != NULL);
+	assert(pos < get_irn_n_outs(def));
+	def->o.out->edges[pos].use = use;
+	def->o.out->edges[pos].pos = in_pos;
 }
 
+unsigned get_Block_n_cfg_outs(const ir_node *bl)
+{
+	assert(is_Block(bl));
+	unsigned n_cfg_outs = 0;
+	for (unsigned i = 0; i < get_irn_n_outs(bl); ++i) {
+		const ir_node *succ = get_irn_out(bl, i);
+		if (get_irn_mode(succ) != mode_X)
+			continue;
+		if (is_End(succ) || is_Bad(succ))
+			continue;
+		n_cfg_outs += get_irn_n_outs(succ);
+	}
+	return n_cfg_outs;
+}
 
-INLINE ir_node *get_Block_cfg_out  (ir_node *bl, int pos) {
-  int i, out_pos = 0;
-  assert(bl && (get_irn_op(bl) == op_Block));
-  for (i = 0; i < (int)bl->out[0]; i++)
-    if ((get_irn_mode(bl->out[i+1]) == mode_X)  &&
-	(get_irn_op(bl->out[i+1]) != op_End)) {
-      if (out_pos == pos) {
-	ir_node *cfop = bl->out[i+1];
-	return cfop->out[0+1];
-      } else {
-	out_pos++;
-      }
-    }
-  return NULL;
+unsigned get_Block_n_cfg_outs_ka(const ir_node *bl)
+{
+	assert(is_Block(bl));
+	unsigned n_cfg_outs = 0;
+	for (unsigned i = 0; i < get_irn_n_outs(bl); ++i) {
+		const ir_node *succ = get_irn_out(bl, i);
+		if (get_irn_mode(succ) != mode_X)
+			continue;
+		if (is_Bad(succ))
+			continue;
+		if (is_End(succ)) {
+			ir_node *end_bl = get_nodes_block(succ);
+			if (end_bl == bl)
+				continue;
+			++n_cfg_outs;
+			continue;
+		}
+		n_cfg_outs += get_irn_n_outs(succ);
+	}
+	return n_cfg_outs;
 }
 
-void irg_out_walk_2(ir_node *node,  irg_walk_func *pre,
-		    irg_walk_func *post, void *env) {
-  int i;
-  ir_node *succ;
+ir_node *get_Block_cfg_out(const ir_node *bl, unsigned pos)
+{
+	assert(is_Block(bl));
+	for (unsigned i = 0; i < get_irn_n_outs(bl); ++i) {
+		const ir_node *succ = get_irn_out(bl, i);
+		if (get_irn_mode(succ) != mode_X)
+			continue;
+		if (is_End(succ) || is_Bad(succ))
+			continue;
+
+		unsigned n_outs = get_irn_n_outs(succ);
+		if (pos < n_outs)
+			return get_irn_out(succ, pos);
+		else
+			pos -= n_outs;
+	}
+	return NULL;
+}
 
-  assert(node);
-  assert(get_irn_visited(node) < get_irg_visited(current_ir_graph));
+ir_node *get_Block_cfg_out_ka(const ir_node *bl, unsigned pos)
+{
+	assert(is_Block(bl));
+	for (unsigned i = 0; i < get_irn_n_outs(bl); ++i) {
+		const ir_node *succ = get_irn_out(bl, i);
+		if (get_irn_mode(succ) != mode_X)
+			continue;
+		if (is_Bad(succ))
+			continue;
+
+		if (is_End(succ)) {
+			ir_node *end_bl = get_nodes_block(succ);
+			if (end_bl == bl) {
+				/* ignore End if we are in the Endblock */
+				continue;
+			}
+			if (pos == 0) {
+				/* handle keep-alive here: return the Endblock instead of the End node */
+				return end_bl;
+			} else {
+				--pos;
+				continue;
+			}
+		}
+		unsigned n_outs = get_irn_n_outs(succ);
+		if (pos < n_outs)
+			return get_irn_out(succ, pos);
+		else
+			pos -= n_outs;
+	}
+	return NULL;
+}
 
-  set_irn_visited(node, get_irg_visited(current_ir_graph));
+static void irg_out_walk_2(ir_node *node, irg_walk_func *pre,
+                           irg_walk_func *post, void *env)
+{
+	assert(get_irn_visited(node) < get_irg_visited(current_ir_graph));
 
-  if (pre) pre(node, env);
+	set_irn_visited(node, get_irg_visited(current_ir_graph));
 
-  for (i = 0; i < get_irn_n_outs(node); i++) {
-    succ = get_irn_out(node, i);
-    if (get_irn_visited(succ) < get_irg_visited(current_ir_graph))
-      irg_out_walk_2(succ, pre, post, env);
-  }
+	if (pre) pre(node, env);
 
-  if (post) post(node, env);
+	int n = get_irn_n_outs(node);
+	for (int i = 0; i < n; ++i) {
+		ir_node *succ = get_irn_out(node, i);
+		if (get_irn_visited(succ) < get_irg_visited(current_ir_graph))
+			irg_out_walk_2(succ, pre, post, env);
+	}
 
-  return;
+	if (post) post(node, env);
 }
 
-void irg_out_walk(ir_node *node,
-		  void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
-		  void *env) {
-  assert(node);
-  if (get_irg_outs_state(current_ir_graph) != no_outs) {
-    inc_irg_visited (current_ir_graph);
-    irg_out_walk_2(node, pre, post, env);
-  }
-  return;
+void irg_out_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+                  void *env)
+{
+	assert(node);
+	ir_graph *irg = get_irn_irg(node);
+	if (irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS)) {
+		inc_irg_visited(irg);
+		irg_out_walk_2(node, pre, post, env);
+	}
 }
 
-void irg_out_block_walk2(ir_node *bl,
-			void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
-			void *env) {
-  int i;
+static void irg_out_block_walk2(ir_node *bl, irg_walk_func *pre,
+                                irg_walk_func *post, void *env)
+{
+	if (Block_block_visited(bl))
+		return;
 
-  assert(get_irn_opcode(bl) == iro_Block);
+	mark_Block_block_visited(bl);
 
-  if(get_Block_block_visited(bl) < get_irg_block_visited(current_ir_graph)) {
-    set_Block_block_visited(bl, get_irg_block_visited(current_ir_graph));
+	if (pre)
+		pre(bl, env);
 
-    if(pre)
-      pre(bl, env);
+	int n = get_Block_n_cfg_outs(bl);
+	for (int i = 0; i < n; ++i) {
+		/* find the corresponding predecessor block. */
+		ir_node *pred = get_Block_cfg_out(bl, i);
+		/* recursion */
+		irg_out_block_walk2(pred, pre, post, env);
+	}
 
-    for(i = 0; i < get_Block_n_cfg_outs(bl); i++) {
-      /* find the corresponding predecessor block. */
-      ir_node *pred = get_Block_cfg_out(bl, i);
-      assert(get_irn_opcode(pred) == iro_Block);
-      /* recursion */
-      irg_out_block_walk2(pred, pre, post, env);
-    }
-
-    if(post)
-      post(bl, env);
-  }
-  return;
+	if (post)
+		post(bl, env);
 }
 
-/* Walks only over Block nodes in the graph.  Has it's own visited
-   flag, so that it can be interleaved with the other walker.         */
-void irg_out_block_walk(ir_node *node,
-			void (pre)(ir_node*, void*), void (post)(ir_node*, void*),
-			void *env) {
-
-  assert((get_irn_op(node) == op_Block) || (get_irn_mode(node) == mode_X));
+void irg_out_block_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+                        void *env)
+{
+	ir_graph *irg = get_irn_irg(node);
+	assert(is_Block(node) || (get_irn_mode(node) == mode_X));
 
-  inc_irg_block_visited(current_ir_graph);
+	ir_graph *rem = current_ir_graph;
+	current_ir_graph = irg;
 
-  if (get_irn_mode(node) == mode_X) node = node->out[1];
-  assert(get_irn_opcode(node)  == iro_Block);
+	inc_irg_block_visited(irg);
 
-  irg_out_block_walk2(node, pre, post, env);
-
-  return;
+	if (get_irn_mode(node) == mode_X) {
+		int n = get_irn_n_outs(node);
+		for (int i = 0; i < n; ++i) {
+			ir_node *succ = get_irn_out(node, i);
+			irg_out_block_walk2(succ, pre, post, env);
+		}
+	} else {
+		irg_out_block_walk2(node, pre, post, env);
+	}
 
+	current_ir_graph = rem;
 }
 
-/**********************************************************************/
-/** Building and Removing the out datasturcture                      **/
+/*--------------------------------------------------------------------*/
+/** Building and Removing the out datastructure                      **/
 /**                                                                  **/
 /** The outs of a graph are allocated in a single, large array.      **/
 /** This allows to allocate and deallocate the memory for the outs   **/
@@ -160,113 +232,133 @@ void irg_out_block_walk(ir_node *node,
 /** Then the large array is allocated.  The second iteration chops   **/
 /** the large array into smaller parts, sets the out edges and       **/
 /** recounts the out edges.                                          **/
-/**********************************************************************/
-
-
-/* Returns the amount of out edges for not yet visited successors. */
-static int count_outs(ir_node *n) {
-  int start, i, res;
-  ir_node *succ;
-
-  set_irn_visited(n, get_irg_visited(current_ir_graph));
-  n->out = (ir_node **) 1;     /* Space for array size. */
-
-  if ((get_irn_op(n) == op_Block)) start = 0; else start = -1;
-  res = get_irn_arity(n) - start +1;  /* --1 or --0; 1 for array size. */
-  for (i = start; i < get_irn_arity(n); i++) {
-    /* Optimize Tuples.  They annoy if walking the cfg. */
-    succ = skip_Tuple(get_irn_n(n, i));
-    set_irn_n(n, i, succ);
-    /* count outs for successors */
-    if (get_irn_visited(succ) < get_irg_visited(current_ir_graph))
-      res += count_outs(succ);
-    /* Count my outs */
-    succ->out = (ir_node **)( (int)succ->out +1);
-  }
-  return res;
+/** Removes Tuple nodes!                                             **/
+/*--------------------------------------------------------------------*/
+
+
+/** Returns the amount of out edges for not yet visited successors. */
+static void count_outs_node(ir_node *n)
+{
+	if (irn_visited_else_mark(n))
+		return;
+
+	/* initialize our counter */
+	n->o.n_outs = 0;
+
+	int start     = is_Block(n) ? 0 : -1;
+	int irn_arity = get_irn_arity(n);
+	for (int i = start; i < irn_arity; ++i) {
+		ir_node *def = get_irn_n(n, i);
+		/* optimize Tuples */
+		ir_node *skipped = skip_Tuple(def);
+		if (skipped != def)
+			set_irn_n(n, i, skipped);
+
+		count_outs_node(skipped);
+		++skipped->o.n_outs;
+	}
 }
 
-static ir_node **set_out_edges(ir_node *n, ir_node **free) {
-  int n_outs, start, i;
-  ir_node *succ;
-
-  set_irn_visited(n, get_irg_visited(current_ir_graph));
-
-  /* Allocate my array */
-  n_outs = (int) n->out;
-  n->out = free;
-  free = &free[n_outs];
-  /* We count the successors again, the space will be sufficient.
-     We use this counter to remember the position for the next back
-     edge. */
-  n->out[0] = (ir_node *)0;
-
-  if (get_irn_op(n) == op_Block) start = 0; else start = -1;
-  for (i = start; i < get_irn_arity(n); i++) {
-    succ = get_irn_n(n, i);
-    /* Recursion */
-    if (get_irn_visited(succ) < get_irg_visited(current_ir_graph))
-      free = set_out_edges(succ, free);
-    /* Remember our back edge */
-    succ->out[get_irn_n_outs(succ)+1] = n;
-    succ->out[0] = (ir_node *) (get_irn_n_outs(succ) + 1);
-  }
-  return free;
-}
 
-static INLINE void fix_start_proj(ir_graph *irg) {
-  ir_node *proj = NULL, *startbl;
-  int i;
-  if (get_Block_n_cfg_outs(get_irg_start_block(irg))) {
-    startbl = get_irg_start_block(irg);
-    for (i = 0; i < get_irn_n_outs(startbl); i++)
-      if (get_irn_mode(get_irn_out(startbl, i)) == mode_X)
-	proj = get_irn_out(startbl, i);
-    if (get_irn_out(proj, 0) == startbl) {
-      assert(get_irn_n_outs(proj) == 2);
-      set_irn_out(proj, 0, get_irn_out(proj, 1));
-      set_irn_out(proj, 1, startbl);
-    }
-  }
+/** Returns the amount of out edges for not yet visited successors.
+ *  This version handles some special nodes like irg_frame, irg_args etc. */
+static void count_outs(ir_graph *irg)
+{
+	inc_irg_visited(irg);
+	count_outs_node(get_irg_end(irg));
+	for (int i = anchor_first; i <= anchor_last; ++i) {
+		ir_node *n = get_irg_anchor(irg, i);
+		if (irn_visited_else_mark(n))
+			continue;
+		n->o.n_outs = 0;
+	}
 }
 
-void compute_outs(ir_graph *irg) {
-  ir_graph *rem = current_ir_graph;
-  int n_out_edges = 0;
-
-  current_ir_graph = irg;
-
-  /* Update graph state */
-  assert(get_irg_phase_state(current_ir_graph) != phase_building);
-  current_ir_graph->outs_state = outs_consistent;
+static void set_out_edges_node(ir_node *node, struct obstack *obst)
+{
+	if (irn_visited_else_mark(node))
+		return;
+
+	/* Allocate my array */
+	unsigned n_outs = node->o.n_outs;
+	node->o.out          = OALLOCF(obst, ir_def_use_edges, edges, n_outs);
+	node->o.out->n_edges = 0;
+
+	/* add def->use edges from my predecessors to me */
+	int start     = is_Block(node) ? 0 : -1;
+	int irn_arity = get_irn_arity(node);
+	for (int i = start; i < irn_arity; ++i) {
+		ir_node *def = get_irn_n(node, i);
+
+		/* recurse, ensures that out array of pred is already allocated */
+		set_out_edges_node(def, obst);
+
+		/* Remember this Def-Use edge */
+		unsigned pos = def->o.out->n_edges++;
+		def->o.out->edges[pos].use = node;
+		def->o.out->edges[pos].pos = i;
+	}
+}
 
-  /* This first iteration counts the overall number of out edges and the
-     number of out edges for each node. */
-  inc_irg_visited(irg);
-  n_out_edges = count_outs(get_irg_end(irg));
+static void set_out_edges(ir_graph *irg)
+{
+	struct obstack *obst = &irg->out_obst;
+
+	obstack_init(obst);
+	irg->out_obst_allocated = true;
+
+	inc_irg_visited(irg);
+	set_out_edges_node(get_irg_end(irg), obst);
+	for (int i = anchor_first; i <= anchor_last; ++i) {
+		ir_node *n = get_irg_anchor(irg, i);
+		if (irn_visited_else_mark(n))
+			continue;
+		n->o.out          = OALLOCF(obst, ir_def_use_edges, edges, 0);
+		n->o.out->n_edges = 0;
+	}
+}
 
-  /* allocate memory for all out edges. */
-  irg->outs = (ir_node **) malloc (n_out_edges * sizeof(ir_node *));
+void compute_irg_outs(ir_graph *irg)
+{
+	free_irg_outs(irg);
 
-  /* The second iteration splits the irg->outs array into smaller arrays
-     for each node and writes the back edges into this array. */
-  inc_irg_visited(irg);
-  set_out_edges(get_irg_end(irg), irg->outs);
+	/* This first iteration counts the overall number of out edges and the
+	   number of out edges for each node. */
+	count_outs(irg);
 
-  /* We want that the out of ProjX from Start contains the next block at
-     position 1, the Start block at position 2.  This is necessary for
-     the out block walker. */
-  fix_start_proj(irg);
+	/* The second iteration splits the irg->outs array into smaller arrays
+	   for each node and writes the back edges into this array. */
+	set_out_edges(irg);
 
-  current_ir_graph = rem;
+	add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS
+	                      | IR_GRAPH_PROPERTY_NO_TUPLES);
 }
 
-void free_outs(ir_graph *irg) {
-
-  /* Update graph state */
-  assert(get_irg_phase_state(current_ir_graph) != phase_building);
-  current_ir_graph->outs_state = no_outs;
+void assure_irg_outs(ir_graph *irg)
+{
+	if (!irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS))
+		compute_irg_outs(irg);
+}
 
-  if (irg->outs) free(irg->outs);
-  irg->outs = NULL;
+#ifdef DEBUG_libfirm
+/** Clear the outs of a node */
+static void reset_outs(ir_node *node, void *unused)
+{
+	(void) unused;
+	node->o.out = NULL;
+}
+#endif
+
+void free_irg_outs(ir_graph *irg)
+{
+	if (irg->out_obst_allocated) {
+		obstack_free(&irg->out_obst, NULL);
+		irg->out_obst_allocated = false;
+	}
+
+#ifdef DEBUG_libfirm
+	/* when debugging, *always* reset all nodes' outs!  irg->outs might
+	   have been lying to us */
+	irg_walk_graph (irg, reset_outs, NULL, NULL);
+#endif
 }