/*
- * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2011 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
* @brief Compute and access out edges (also called def-use edges).
* @author Goetz Lindenmaier, Michael Beck
* @date 1.2002
- * @version $Id$
*/
#include "config.h"
#include "irgraph_t.h"
#include "irprog_t.h"
#include "irgwalk.h"
-#include "irtools.h"
+#include "util.h"
#include "irprintf.h"
#include "error.h"
+#include "ircons.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 **/
-/*--------------------------------------------------------------------*/
-
-#ifdef DEBUG_libfirm
-/** Clear the outs of a node */
-static void reset_outs(ir_node *node, void *unused)
-{
- (void) unused;
- node->out = NULL;
- node->out_valid = 0;
-}
-#endif
-
-int get_irn_outs_computed(const ir_node *node)
+unsigned get_irn_n_outs(const ir_node *node)
{
- return node->out != NULL;
+ return node->o.out->n_edges;
}
-/* returns the number of successors of the node: */
-int get_irn_n_outs(const ir_node *node)
+ir_node *get_irn_out(const ir_node *def, unsigned pos)
{
- assert(node && node->kind == k_ir_node);
-#ifdef DEBUG_libfirm
- /* assert(node->out_valid); */
-#endif /* defined DEBUG_libfirm */
- /* we misuse the first for the size info of the out array */
- return node->out[0].pos;
+ assert(pos < get_irn_n_outs(def));
+ return def->o.out->edges[pos].use;
}
-/* Access successor n */
-ir_node *get_irn_out(const ir_node *def, int pos)
+ir_node *get_irn_out_ex(const ir_node *def, unsigned pos, int *in_pos)
{
- assert(pos >= 0 && pos < get_irn_n_outs(def));
-#ifdef DEBUG_libfirm
- /* assert(def->out_valid); */
-#endif /* defined DEBUG_libfirm */
- return def->out[pos+1].use;
+ assert(pos < get_irn_n_outs(def));
+ *in_pos = def->o.out->edges[pos].pos;
+ return def->o.out->edges[pos].use;
}
-/* Access successor n */
-ir_node *get_irn_out_ex(const ir_node *def, int pos, int *in_pos)
+void set_irn_out(ir_node *def, unsigned pos, ir_node *use, int in_pos)
{
- assert(pos >= 0 && pos < get_irn_n_outs(def));
-#ifdef DEBUG_libfirm
- /* assert(def->out_valid); */
-#endif /* defined DEBUG_libfirm */
- *in_pos = def->out[pos+1].pos;
- return def->out[pos+1].use;
+ 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;
}
-void set_irn_out(ir_node *def, int pos, ir_node *use, int in_pos)
+unsigned get_Block_n_cfg_outs(const ir_node *bl)
{
- assert(def && use);
- assert(pos >= 0 && pos < get_irn_n_outs(def));
-#ifdef DEBUG_libfirm
- def->out_valid = 1; /* assume that this function is used correctly */
-#endif /* defined DEBUG_libfirm */
- def->out[pos+1].use = use;
- def->out[pos+1].pos = in_pos;
-}
-
-/* Return the number of control flow successors, ignore keep-alives. */
-int get_Block_n_cfg_outs(const ir_node *bl)
-{
- int i, n_cfg_outs = 0;
- assert(bl && is_Block(bl));
-#ifdef DEBUG_libfirm
- assert(bl->out_valid);
-#endif /* defined DEBUG_libfirm */
- for (i = 1; i <= bl->out[0].pos; ++i) {
- ir_node *succ = bl->out[i].use;
- if (get_irn_mode(succ) == mode_X && !is_End(succ))
- n_cfg_outs += succ->out[0].pos;
+ 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;
}
-/* Return the number of control flow successors, honor keep-alives. */
-int get_Block_n_cfg_outs_ka(const ir_node *bl)
+unsigned get_Block_n_cfg_outs_ka(const ir_node *bl)
{
- int i, n_cfg_outs = 0;
- assert(bl && is_Block(bl));
-#ifdef DEBUG_libfirm
- assert(bl->out_valid);
-#endif /* defined DEBUG_libfirm */
- for (i = 1; i <= bl->out[0].pos; ++i) {
- ir_node *succ = bl->out[i].use;
- if (get_irn_mode(succ) == mode_X) {
-
- if (is_End(succ)) {
- /* ignore End if we are in the Endblock */
- if (get_nodes_block(succ) == bl)
- continue;
- else /* count Keep-alive as one */
- n_cfg_outs += 1;
- } else
- n_cfg_outs += succ->out[0].pos;
+ 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;
}
-/* Access predecessor n, ignore keep-alives. */
-ir_node *get_Block_cfg_out(const ir_node *bl, int pos)
+ir_node *get_Block_cfg_out(const ir_node *bl, unsigned pos)
{
- int i;
- assert(bl && is_Block(bl));
-#ifdef DEBUG_libfirm
- assert(bl->out_valid);
-#endif /* defined DEBUG_libfirm */
- for (i = 1; i <= bl->out[0].pos; ++i) {
- ir_node *succ = bl->out[i].use;
- if (get_irn_mode(succ) == mode_X && !is_End(succ)) {
- int n_outs = succ->out[0].pos;
- if (pos < n_outs)
- return succ->out[pos + 1].use;
- else
- pos -= n_outs;
- }
+ 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;
}
-/* Access predecessor n, honor keep-alives. */
-ir_node *get_Block_cfg_out_ka(const ir_node *bl, int pos)
+ir_node *get_Block_cfg_out_ka(const ir_node *bl, unsigned pos)
{
- int i, n_outs;
- assert(bl && is_Block(bl));
-#ifdef DEBUG_libfirm
- assert (bl->out_valid);
-#endif /* defined DEBUG_libfirm */
- for (i = 1; i <= bl->out[0].pos; ++i) {
- ir_node *succ = bl->out[i].use;
- if (get_irn_mode(succ) == mode_X) {
- 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;
+ 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 {
- n_outs = succ->out[0].pos;
- if (pos < n_outs)
- return succ->out[pos + 1].use;
- else
- pos -= n_outs;
+ --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;
}
static void irg_out_walk_2(ir_node *node, irg_walk_func *pre,
irg_walk_func *post, void *env)
{
- int i, n;
- ir_node *succ;
-
- assert(node);
assert(get_irn_visited(node) < get_irg_visited(current_ir_graph));
set_irn_visited(node, get_irg_visited(current_ir_graph));
if (pre) pre(node, env);
- for (i = 0, n = get_irn_n_outs(node); i < n; ++i) {
- succ = get_irn_out(node, i);
+ 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);
}
void *env)
{
assert(node);
- if (get_irg_outs_state(current_ir_graph) != outs_none) {
- inc_irg_visited (current_ir_graph);
+ 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);
}
}
static void irg_out_block_walk2(ir_node *bl, irg_walk_func *pre,
irg_walk_func *post, void *env)
{
- int i, n;
+ if (Block_block_visited(bl))
+ return;
- if (!Block_block_visited(bl)) {
- mark_Block_block_visited(bl);
+ mark_Block_block_visited(bl);
- if (pre)
- pre(bl, env);
-
- for (i = 0, n = get_Block_n_cfg_outs(bl); 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);
- }
+ if (pre)
+ pre(bl, env);
- if (post)
- post(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);
}
+
+ 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, 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;
+
+ inc_irg_block_visited(irg);
if (get_irn_mode(node) == mode_X) {
- int i, n;
-
- for (i = 0, n = get_irn_n_outs(node); i < n; ++i) {
+ 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 {
+ } else {
irg_out_block_walk2(node, pre, post, env);
}
+
+ current_ir_graph = rem;
}
/*--------------------------------------------------------------------*/
/** Returns the amount of out edges for not yet visited successors. */
-static int _count_outs(ir_node *n)
+static void count_outs_node(ir_node *n)
{
- int start, i, res, irn_arity;
-
- mark_irn_visited(n);
- n->out = INT_TO_PTR(1); /* Space for array size. */
-
- 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. */
- ir_node *pred = get_irn_n(n, i);
- ir_node *skipped_pred = skip_Tuple(pred);
-
- if (skipped_pred != pred) {
- set_irn_n(n, i, skipped_pred);
- }
-
- /* count Def-Use edges for predecessors */
- if (!irn_visited(skipped_pred))
- res += _count_outs(skipped_pred);
-
- /*count my Def-Use edges */
- skipped_pred->out = INT_TO_PTR(PTR_TO_INT(skipped_pred->out) + 1);
+ 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;
}
- return res;
}
/** Returns the amount of out edges for not yet visited successors.
- * This version handles some special nodes like irg_frame, irg_args etc.
- */
-static int count_outs(ir_graph *irg)
+ * This version handles some special nodes like irg_frame, irg_args etc. */
+static void count_outs(ir_graph *irg)
{
- ir_node *n;
- int i, res;
-
inc_irg_visited(irg);
- res = _count_outs(get_irg_end(irg));
-
- /* Now handle anchored nodes. We need the out count of those
- even if they are not visible. */
- for (i = anchor_last - 1; i >= 0; --i) {
- n = get_irg_anchor(irg, i);
- if (!irn_visited_else_mark(n)) {
- n->out = INT_TO_PTR(1);
- ++res;
- }
+ 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;
}
- return res;
}
-/**
- * Enter memory for the outs to a node.
- *
- * @param use current node
- * @param free current free address in the chunk allocated for the outs
- *
- * @return The next free address
- */
-static ir_def_use_edge *_set_out_edges(ir_node *use, ir_def_use_edge *free)
+static void set_out_edges_node(ir_node *node, struct obstack *obst)
{
- int n_outs, start, i, irn_arity, pos;
-
- mark_irn_visited(use);
+ if (irn_visited_else_mark(node))
+ return;
/* Allocate my array */
- n_outs = PTR_TO_INT(use->out);
- use->out = free;
-#ifdef DEBUG_libfirm
- use->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. */
- use->out[0].pos = 0;
-
- start = is_Block(use) ? 0 : -1;
- irn_arity = get_irn_arity(use);
+ 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;
- for (i = start; i < irn_arity; ++i) {
- ir_node *def = get_irn_n(use, i);
+ /* 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);
- /* Recursion */
- if (!irn_visited(def))
- free = _set_out_edges(def, free);
+ /* recurse, ensures that out array of pred is already allocated */
+ set_out_edges_node(def, obst);
/* Remember this Def-Use edge */
- pos = def->out[0].pos + 1;
- def->out[pos].use = use;
- def->out[pos].pos = i;
-
- /* increase the number of Def-Use edges so far */
- def->out[0].pos = pos;
+ unsigned pos = def->o.out->n_edges++;
+ def->o.out->edges[pos].use = node;
+ def->o.out->edges[pos].pos = i;
}
- return free;
}
-/**
- * Enter memory for the outs to a node. Handles special nodes
- *
- * @param irg the graph
- * @param free current free address in the chunk allocated for the outs
- *
- * @return The next free address
- */
-static ir_def_use_edge *set_out_edges(ir_graph *irg, ir_def_use_edge *free)
+static void set_out_edges(ir_graph *irg)
{
- ir_node *n;
- int i, n_outs;
+ struct obstack *obst = &irg->out_obst;
+
+ obstack_init(obst);
+ irg->out_obst_allocated = true;
inc_irg_visited(irg);
- free = _set_out_edges(get_irg_end(irg), free);
-
- /* handle anchored nodes */
- for (i = anchor_last - 1; i >= 0; --i) {
- n = get_irg_anchor(irg, i);
- if (!irn_visited_else_mark(n)) {
- n_outs = PTR_TO_INT(n->out);
- n->out = free;
-#ifdef DEBUG_libfirm
- n->out_valid = 1;
-#endif /* defined DEBUG_libfirm */
- free += n_outs;
- }
+ 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;
}
-
- return free;
}
-/* compute the outs for a given graph */
void compute_irg_outs(ir_graph *irg)
{
- ir_graph *rem = current_ir_graph;
- int n_out_edges = 0;
- ir_def_use_edge *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_irg_outs(current_ir_graph);
+ free_irg_outs(irg);
/* This first iteration counts the overall number of out edges and the
number of out edges for each node. */
- n_out_edges = count_outs(irg);
-
- /* allocate memory for all out edges. */
- irg->outs = XMALLOCNZ(ir_def_use_edge, n_out_edges);
-#ifdef DEBUG_libfirm
- irg->n_outs = n_out_edges;
-#endif /* defined DEBUG_libfirm */
+ count_outs(irg);
/* The second iteration splits the irg->outs array into smaller arrays
for each node and writes the back edges into this array. */
- end = set_out_edges(irg, irg->outs);
-
- /* Check how much memory we have used */
- assert (end == (irg->outs + n_out_edges));
+ set_out_edges(irg);
- current_ir_graph->outs_state = outs_consistent;
- current_ir_graph = rem;
+ add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS
+ | IR_GRAPH_PROPERTY_NO_TUPLES);
}
void assure_irg_outs(ir_graph *irg)
{
- if (get_irg_outs_state(irg) != outs_consistent)
+ if (!irg_has_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS))
compute_irg_outs(irg);
}
-void compute_irp_outs(void)
-{
- int i;
- for (i = get_irp_n_irgs() -1; i >= 0; --i)
- compute_irg_outs(get_irp_irg(i));
-}
-
-void free_irp_outs(void)
+#ifdef DEBUG_libfirm
+/** Clear the outs of a node */
+static void reset_outs(ir_node *node, void *unused)
{
- int i;
- for (i = get_irp_n_irgs() -1; i >= 0; --i)
- free_irg_outs(get_irp_irg(i));
+ (void) unused;
+ node->o.out = NULL;
}
+#endif
void free_irg_outs(ir_graph *irg)
{
- /* 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->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 /* defined DEBUG_libfirm */
+#endif
}
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