X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fana%2Firouts.c;h=3ebce10d3a640b4590141a6de320f082098e8692;hb=4bad1346ff2abc3923beea23e5ac949acc7ca514;hp=df5a3332dbc8f9e4d6694adb753266b2ce1ebff4;hpb=2eac1656f9f2a371127b9a5fac43cbf0648002c0;p=libfirm

diff --git a/ir/ana/irouts.c b/ir/ana/irouts.c
index df5a3332d..3ebce10d3 100644
--- a/ir/ana/irouts.c
+++ b/ir/ana/irouts.c
@@ -10,76 +10,112 @@
  * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
  */
 
-
-
- /* 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).
-*
-*/
-
-/* $Id$ */
-
+ /**
+  * @file irouts.c Compute out edges for ir nodes (also called def-use edges).
+  *
+  * Copyright (C) 2002 by Universitaet Karlsruhe
+  * All rights reserved.
+  *
+  * Authors:  Goetz Lindenmaier
+  */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#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 */
+#include "irgraph_t.h"
+#include "irprog_t.h"
+#include "irgwalk.h"
+
+#ifdef DEBUG_libfirm
+/* Note:  ir_node.out_valid and ir_graph.n_outs are only present when DEBUG_libfirm is defined */
+/* Accesses to out_valid and n_outs are fenced out to avoid breakage
+   when compiling with neither DEBUG_libfirm or NDEBUG defined */
+#endif /* defined DEBUG_libfirm */
 
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
 /** Accessing the out datastructures                                 **/
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
+
+/** Clear the outs of a node */
+static void reset_outs (ir_node *node, void *unused)
+{
+  node->out = NULL;
+#ifdef DEBUG_libfirm
+  node->out_valid = 0;
+#endif /* defined DEBUG_libfirm */
+}
 
 /* returns the number of successors of the node: */
-INLINE int get_irn_n_outs    (ir_node *node) {
+int get_irn_n_outs    (ir_node *node) {
+  assert(node && node->kind == k_ir_node);
+#ifdef DEBUG_libfirm
+  /* assert (node->out_valid); */
+#endif /* defined DEBUG_libfirm */
   return (int)(node->out[0]);
 }
 
 /* Access successor n */
-INLINE ir_node *get_irn_out      (ir_node *node, int pos) {
-  assert(node);
+ir_node *get_irn_out      (ir_node *node, int pos) {
   assert(pos >= 0 && pos < get_irn_n_outs(node));
+#ifdef DEBUG_libfirm
+  /* assert (node->out_valid); */
+#endif /* defined DEBUG_libfirm */
   return node->out[pos+1];
 }
 
-INLINE void set_irn_out      (ir_node *node, int pos, ir_node *out) {
+void set_irn_out      (ir_node *node, int pos, ir_node *out) {
   assert(node && out);
   assert(pos >= 0 && pos < get_irn_n_outs(node));
+#ifdef DEBUG_libfirm
+  node->out_valid = 1;          /* assume that this function is used correctly */
+#endif /* defined DEBUG_libfirm */
   node->out[pos+1] = out;
 }
 
 
-INLINE int get_Block_n_cfg_outs (ir_node *bl) {
+int get_Block_n_cfg_outs (ir_node *bl) {
   int i, n_cfg_outs = 0;
   assert(bl && (get_irn_op(bl) == op_Block));
+#ifdef DEBUG_libfirm
+  assert (bl->out_valid);
+#endif /* defined DEBUG_libfirm */
   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++;
+        (get_irn_op(bl->out[i+1]) != op_End))
+      n_cfg_outs++;
   return n_cfg_outs;
 }
 
 
-INLINE ir_node *get_Block_cfg_out  (ir_node *bl, int pos) {
+ir_node *get_Block_cfg_out  (ir_node *bl, int pos) {
   int i, out_pos = 0;
   assert(bl && (get_irn_op(bl) == op_Block));
+#ifdef DEBUG_libfirm
+  assert (bl->out_valid);
+#endif /* defined DEBUG_libfirm */
   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)) {
+        (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];
+        ir_node *cfop = bl->out[i+1];
+        return cfop->out[0+1];
       } else {
-	out_pos++;
+        out_pos++;
       }
     }
   return NULL;
 }
 
-void irg_out_walk_2(ir_node *node,  irg_walk_func *pre,
-		    irg_walk_func *post, void *env) {
+static void irg_out_walk_2(ir_node *node,  irg_walk_func *pre,
+            irg_walk_func *post, void *env) {
   int i;
   ir_node *succ;
 
@@ -102,23 +138,21 @@ void irg_out_walk_2(ir_node *node,  irg_walk_func *pre,
 }
 
 void irg_out_walk(ir_node *node,
-			irg_walk_func *pre, irg_walk_func *post,
-			void *env) {
+            irg_walk_func *pre, irg_walk_func *post,
+            void *env) {
   assert(node);
-  if (get_irg_outs_state(current_ir_graph) != no_outs) {
+  if (get_irg_outs_state(current_ir_graph) != outs_none) {
     inc_irg_visited (current_ir_graph);
     irg_out_walk_2(node, pre, post, env);
   }
   return;
 }
 
-void irg_out_block_walk2(ir_node *bl,
-			irg_walk_func *pre, irg_walk_func *post,
-			void *env) {
+static void irg_out_block_walk2(ir_node *bl,
+            irg_walk_func *pre, irg_walk_func *post,
+            void *env) {
   int i;
 
-  assert(get_irn_opcode(bl) == iro_Block);
-
   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));
 
@@ -128,7 +162,6 @@ void irg_out_block_walk2(ir_node *bl,
     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);
     }
@@ -142,15 +175,14 @@ void irg_out_block_walk2(ir_node *bl,
 /* 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,
-			irg_walk_func *pre, irg_walk_func *post,
-			void *env) {
+            irg_walk_func *pre, irg_walk_func *post,
+            void *env) {
 
   assert((get_irn_op(node) == op_Block) || (get_irn_mode(node) == mode_X));
 
   inc_irg_block_visited(current_ir_graph);
 
   if (get_irn_mode(node) == mode_X) node = node->out[1];
-  assert(get_irn_opcode(node)  == iro_Block);
 
   irg_out_block_walk2(node, pre, post, env);
 
@@ -158,7 +190,7 @@ void irg_out_block_walk(ir_node *node,
 
 }
 
-/**********************************************************************/
+/*--------------------------------------------------------------------*/
 /** Building and Removing the out datasturcture                      **/
 /**                                                                  **/
 /** The outs of a graph are allocated in a single, large array.      **/
@@ -174,34 +206,46 @@ 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.                                          **/
-/**********************************************************************/
+/** Removes Tuple nodes!                                             **/
+/*--------------------------------------------------------------------*/
 
 
-/* Returns the amount of out edges for not yet visited successors. */
+/** 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;
+  int start, i, res, irn_arity;
 
   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++) {
+  start = is_Block(n) ? 0 : -1;
+  irn_arity = get_irn_arity(n);
+  res = irn_arity - start + 1;  /* --1 or --0; 1 for array size. */
+
+  for (i = start; i < irn_arity; i++) {
     /* Optimize Tuples.  They annoy if walking the cfg. */
-    succ = skip_Tuple(get_irn_n(n, i));
+    ir_node *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))
+    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);
+    succ->out = (ir_node **)( (int)succ->out + 1);
   }
   return res;
 }
 
+/**
+ * Enter memory for the outs to a node.
+ *
+ * @param n      current node
+ * @param free   current free address in the chunk allocated for the outs
+ *
+ * @return The next free address
+ */
 static ir_node **set_out_edges(ir_node *n, ir_node **free) {
-  int n_outs, start, i;
+  int n_outs, start, i, irn_arity;
   ir_node *succ;
 
   set_irn_visited(n, get_irg_visited(current_ir_graph));
@@ -209,14 +253,19 @@ static ir_node **set_out_edges(ir_node *n, ir_node **free) {
   /* Allocate my array */
   n_outs = (int) n->out;
   n->out = free;
-  free = &free[n_outs];
+#ifdef DEBUG_libfirm
+  n->out_valid = 1;
+#endif /* defined DEBUG_libfirm */
+  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++) {
+  start = is_Block(n) ? 0 : -1;
+  irn_arity = get_irn_arity(n);
+
+  for (i = start; i < irn_arity; i++) {
     succ = get_irn_n(n, i);
     /* Recursion */
     if (get_irn_visited(succ) < get_irg_visited(current_ir_graph))
@@ -228,14 +277,21 @@ static ir_node **set_out_edges(ir_node *n, ir_node **free) {
   return free;
 }
 
+/* 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. */
 static INLINE void fix_start_proj(ir_graph *irg) {
-  ir_node *proj = NULL, *startbl;
+  ir_node *proj    = NULL;
+  ir_node *startbl = get_irg_start_block(irg);
   int i;
-  if (get_Block_n_cfg_outs(get_irg_start_block(irg))) {
-    startbl = get_irg_start_block(irg);
+
+  if (get_Block_n_cfg_outs(startbl)) {
     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_mode(get_irn_out(startbl, i)) == mode_X) {
+        proj = get_irn_out(startbl, i);
+        break;
+      }
+
     if (get_irn_out(proj, 0) == startbl) {
       assert(get_irn_n_outs(proj) == 2);
       set_irn_out(proj, 0, get_irn_out(proj, 1));
@@ -244,14 +300,19 @@ static INLINE void fix_start_proj(ir_graph *irg) {
   }
 }
 
+/* compute the outs for a given graph */
 void compute_outs(ir_graph *irg) {
   ir_graph *rem = current_ir_graph;
   int n_out_edges = 0;
+  ir_node **end = NULL;         /* Only for debugging */
 
   current_ir_graph = irg;
 
   /* Update graph state */
   assert(get_irg_phase_state(current_ir_graph) != phase_building);
+
+  if (current_ir_graph->outs_state != outs_none)
+    free_outs(current_ir_graph);
   current_ir_graph->outs_state = outs_consistent;
 
   /* This first iteration counts the overall number of out edges and the
@@ -260,12 +321,18 @@ void compute_outs(ir_graph *irg) {
   n_out_edges = count_outs(get_irg_end(irg));
 
   /* allocate memory for all out edges. */
-  irg->outs = (ir_node **) malloc (n_out_edges * sizeof(ir_node *));
+  irg->outs = xcalloc(n_out_edges, sizeof(irg->outs[0]));
+#ifdef DEBUG_libfirm
+  irg->n_outs = n_out_edges;
+#endif /* defined DEBUG_libfirm */
 
   /* 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);
+  end = set_out_edges(get_irg_end(irg), irg->outs);
+
+  /* Check how much memory we have used */
+  assert (end == (irg->outs + n_out_edges));
 
   /* 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
@@ -275,12 +342,169 @@ void compute_outs(ir_graph *irg) {
   current_ir_graph = rem;
 }
 
+
+
+
+/*------------------------------------------------------------*
+ *  This computes the outedges for in interprocedural graph.  *
+ *  There is one quirk:                                       *
+ *  The number of the outedges for each node is saved in      *
+ *  the first member of the ir_node** array. Maybe we should  *
+ *  change this to make it more portable...                   *
+ *------------------------------------------------------------*/
+
+
+/**
+ * Inits the number of outedges for each node
+ * before counting.
+ */
+static void init_count(ir_node * node, void *env) {
+  node->out = (ir_node **) 1; /* 1 for the array size */
+}
+
+
+/**
+ * Adjusts the out edge count for its predecessors
+ * and adds the current arity to the overall count,
+ * which is saved in "env"
+ */
+static void node_arity_count(ir_node * node, void * env)
+{
+  int *anz = (int *) env, arity, n_outs, i, start;
+  ir_node *succ;
+
+  arity = get_irn_arity(node);
+  start = (is_Block(node)) ? 0 : -1;
+
+  n_outs = 1 + arity + (-start);  // ((is_Block(node)) ? 0 : 1);   // Why + 1??
+  *anz += n_outs;
+
+  for(i = start; i < arity; i++) {
+    succ = get_irn_n(node, i);
+    succ->out = (ir_node **)((int)succ->out + 1);
+  }
+}
+
+
+/*
+ * Inits all nodes for setting the outedges
+ * Returns the overall count of edges
+ */
+int count_ip_outs(void) {
+
+  int res = 0;
+
+  cg_walk(init_count, node_arity_count, &res);
+
+  return(res);
+}
+
+static int dummy_count = 0, global_count; /* Only for debugging */
+
+/**
+ * For each node: Sets the pointer to array
+ * in which the outedges are written later.
+ * The current array start is transported in env
+ */
+static void set_array_pointer(ir_node *node, void *env) {
+
+  int n_outs;
+  ir_node ***free = (ir_node ***) env;
+
+  /* Allocate my array */
+  n_outs = (int) node -> out;  /* We wrote the count here in count_ip_outs */
+  dummy_count += n_outs;
+  assert(dummy_count <= global_count && "More outedges than initially counted!");
+  node -> 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. */
+  node -> out[0] = (ir_node *) 0;
+}
+
+
+/**
+ * Adds an outedge from the predecessor to the
+ * current node.
+ */
+static void set_out_pointer(ir_node * node, void * env) {
+  int i, arity = get_irn_arity(node);
+  ir_node *succ;
+  int start = (!is_Block(node)) ? -1 : 0;
+
+  for(i = start; i < arity; i++) {
+    succ = get_irn_n(node, i);
+    succ->out[get_irn_n_outs(succ)+1] = node;
+    succ->out[0] = (ir_node *) (get_irn_n_outs(succ) + 1);
+  }
+}
+
+
+/*
+ * Sets the outedges for all nodes.
+ */
+void set_ip_outs(void)
+{
+  ir_node **outedge_array = get_irp_ip_outedges();
+  cg_walk(set_array_pointer, set_out_pointer, (void *) &outedge_array);
+}
+
+
+
+/*
+ * Counts the outedges, allocates memory to save the
+ * outedges and fills this outedge array in interprocedural
+ * view!
+ */
+void compute_ip_outs(void) {
+
+  int n_out_edges;
+  ir_node **out_edges;
+
+  assert(get_irp_ip_view_state() == ip_view_valid &&
+     "Cannot construct outs for invalid ip view.");
+
+  if (irp->outs_state != outs_none) {
+    free_ip_outs();
+  }
+
+  global_count = n_out_edges = count_ip_outs();
+  out_edges = xcalloc(n_out_edges, sizeof(out_edges[0]));
+  set_irp_ip_outedges(out_edges);
+  set_ip_outs();
+}
+
+void free_ip_outs(void)
+{
+  ir_node **out_edges = get_irp_ip_outedges();
+  if (out_edges != NULL) {
+    free(out_edges);
+    set_irp_ip_outedges(NULL);
+  }
+  irp->outs_state = outs_none;
+}
+
+
 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;
+  /*   current_ir_graph->outs_state = outs_none; */
+  irg->outs_state = outs_none;
+
+  if (irg->outs) {
+#ifdef DEBUG_libfirm
+    memset(irg->outs, 0, irg->n_outs);
+#endif /* defined DEBUG_libfirm */
+    free(irg->outs);
+    irg->outs = NULL;
+#ifdef DEBUG_libfirm
+    irg->n_outs = 0;
+#endif /* defined DEBUG_libfirm */
+  }
 
-  if (irg->outs) free(irg->outs);
-  irg->outs = NULL;
+#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 /* defined DEBUG_libfirm */
 }