/*
- * Copyright (C) 1995-2007 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 $Id$
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
-#ifdef HAVE_STRING_H
#include <string.h>
-#endif
#include "xmalloc.h"
#include "irouts.h"
#include "irgraph_t.h"
#include "irprog_t.h"
#include "irgwalk.h"
-#include "irtools.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 */
+#include "util.h"
+#include "irprintf.h"
+#include "error.h"
+#include "ircons.h"
/*--------------------------------------------------------------------*/
/** Accessing the out datastructures **/
#ifdef DEBUG_libfirm
/** Clear the outs of a node */
-static void reset_outs(ir_node *node, void *unused) {
+static void reset_outs(ir_node *node, void *unused)
+{
(void) unused;
node->out = NULL;
node->out_valid = 0;
}
#endif
-/* returns the number of successors of the node: */
-int get_irn_n_outs(ir_node *node) {
+int get_irn_outs_computed(const ir_node *node)
+{
+ return node->out != NULL;
+}
+
+int get_irn_n_outs(const ir_node *node)
+{
assert(node && node->kind == k_ir_node);
#ifdef DEBUG_libfirm
- /* assert(node->out_valid); */
+ assert(node->out_valid);
#endif /* defined DEBUG_libfirm */
- return PTR_TO_INT(node->out[0]);
+ /* we misuse the first for the size info of the out array */
+ return node->out[0].pos;
}
-/* Access successor n */
-ir_node *get_irn_out(ir_node *node, int pos) {
- assert(pos >= 0 && pos < get_irn_n_outs(node));
+ir_node *get_irn_out(const ir_node *def, int pos)
+{
+ assert(pos >= 0 && pos < get_irn_n_outs(def));
#ifdef DEBUG_libfirm
- /* assert(node->out_valid); */
+ assert(def->out_valid);
#endif /* defined DEBUG_libfirm */
-return node->out[pos+1];
+ return def->out[pos+1].use;
}
-void set_irn_out(ir_node *node, int pos, ir_node *out) {
- assert(node && out);
- assert(pos >= 0 && pos < get_irn_n_outs(node));
+ir_node *get_irn_out_ex(const ir_node *def, int pos, int *in_pos)
+{
+ assert(pos >= 0 && pos < get_irn_n_outs(def));
#ifdef DEBUG_libfirm
- node->out_valid = 1; /* assume that this function is used correctly */
+ assert(def->out_valid);
#endif /* defined DEBUG_libfirm */
- node->out[pos+1] = out;
+ *in_pos = def->out[pos+1].pos;
+ return def->out[pos+1].use;
}
-/* Return the number of control flow successors, ignore keep-alives. */
-int get_Block_n_cfg_outs(ir_node *bl) {
+void set_irn_out(ir_node *def, int pos, ir_node *use, int in_pos)
+{
+ assert(def && use);
+ assert(pos >= 0 && pos < get_irn_n_outs(def));
+#ifdef DEBUG_libfirm
+ assert(def->out_valid);
+#endif /* defined DEBUG_libfirm */
+ def->out[pos+1].use = use;
+ def->out[pos+1].pos = in_pos;
+}
+
+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 <= PTR_TO_INT(bl->out[0]); ++i)
- if ((get_irn_mode(bl->out[i]) == mode_X) &&
- (get_irn_op(bl->out[i]) != op_End))
- ++n_cfg_outs;
+ 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) && !is_Bad(succ))
+ n_cfg_outs += succ->out[0].pos;
+ }
return n_cfg_outs;
}
-/* Return the number of control flow successors, honor keep-alives. */
-int get_Block_n_cfg_outs_ka(ir_node *bl) {
+int 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 <= PTR_TO_INT(bl->out[0]); ++i)
- if (get_irn_mode(bl->out[i]) == mode_X) {
- /* ignore End if we are in the Endblock */
- if (get_irn_op(bl->out[i]) == op_End &&
- get_irn_n(bl->out[i], -1) == bl)
+ 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_Bad(succ))
continue;
- else
- ++n_cfg_outs;
+ 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;
}
+ }
return n_cfg_outs;
}
-/* Access predecessor n, ignore keep-alives. */
-ir_node *get_Block_cfg_out(ir_node *bl, int pos) {
- int i, out_pos = 0;
+ir_node *get_Block_cfg_out(const ir_node *bl, int pos)
+{
+ int i;
assert(bl && is_Block(bl));
#ifdef DEBUG_libfirm
- assert (bl->out_valid);
+ assert(bl->out_valid);
#endif /* defined DEBUG_libfirm */
- for (i = 1; i <= PTR_TO_INT(bl->out[0]); ++i)
- if ((get_irn_mode(bl->out[i]) == mode_X) &&
- (get_irn_op(bl->out[i]) != op_End)) {
- if (out_pos == pos) {
- ir_node *cfop = bl->out[i];
- return cfop->out[1];
- } else
- ++out_pos;
+ 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) && !is_Bad(succ)) {
+ int n_outs = succ->out[0].pos;
+ if (pos < n_outs)
+ return succ->out[pos + 1].use;
+ else
+ pos -= n_outs;
}
+ }
return NULL;
}
-/* Access predecessor n, honor keep-alives. */
-ir_node *get_Block_cfg_out_ka(ir_node *bl, int pos) {
- int i, out_pos = 0;
+ir_node *get_Block_cfg_out_ka(const ir_node *bl, int 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 <= PTR_TO_INT(bl->out[0]); ++i)
- if (get_irn_mode(bl->out[i]) == mode_X) {
- /* ignore End if we are in the Endblock */
- if (get_irn_op(bl->out[i]) == op_End &&
- get_irn_n(bl->out[i], -1) == bl)
+ 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_Bad(succ))
continue;
- if (out_pos == pos) {
- ir_node *cfop = bl->out[i];
- /* handle keep-alive here */
- if (get_irn_op(cfop) == op_End)
- return get_irn_n(cfop, -1);
- return cfop->out[1];
- } else
- ++out_pos;
+ 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;
+ } else {
+ n_outs = succ->out[0].pos;
+ if (pos < n_outs)
+ return succ->out[pos + 1].use;
+ 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) {
+ irg_walk_func *post, void *env)
+{
int i, n;
ir_node *succ;
}
if (post) post(node, env);
-
- return;
}
-void irg_out_walk(ir_node *node,
- irg_walk_func *pre, irg_walk_func *post,
- void *env) {
+void irg_out_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+ 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);
}
- return;
}
-static 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, n;
- if (Block_not_block_visited(bl)) {
+ if (!Block_block_visited(bl)) {
mark_Block_block_visited(bl);
if (pre)
}
}
-/* 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) {
+void irg_out_block_walk(ir_node *node, irg_walk_func *pre, irg_walk_func *post,
+ void *env)
+{
assert(is_Block(node) || (get_irn_mode(node) == mode_X));
inc_irg_block_visited(current_ir_graph);
- if (get_irn_mode(node) == mode_X)
- node = node->out[1];
+ if (get_irn_mode(node) == mode_X) {
+ int i, n;
- irg_out_block_walk2(node, pre, post, env);
+ for (i = 0, n = get_irn_n_outs(node); 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);
+ }
}
/*--------------------------------------------------------------------*/
-/** 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 **/
/** Returns the amount of out edges for not yet visited successors. */
-static int _count_outs(ir_node *n) {
+static int _count_outs(ir_node *n)
+{
int start, i, res, irn_arity;
mark_irn_visited(n);
- n->out = (ir_node **) 1; /* Space for array size. */
+ n->out = (ir_def_use_edge*) INT_TO_PTR(1); /* Space for array size. */
start = is_Block(n) ? 0 : -1;
irn_arity = get_irn_arity(n);
for (i = start; i < irn_arity; ++i) {
/* Optimize Tuples. They annoy if walking the cfg. */
- ir_node *pred = skip_Tuple(get_irn_n(n, i));
- set_irn_n(n, i, pred);
+ 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 outs for successors */
- if (irn_not_visited(pred))
- res += _count_outs(pred);
+ /* count Def-Use edges for predecessors */
+ if (!irn_visited(skipped_pred))
+ res += _count_outs(skipped_pred);
- /* Count my outs */
- pred->out = (ir_node **)INT_TO_PTR(PTR_TO_INT(pred->out) + 1);
+ /*count my Def-Use edges */
+ skipped_pred->out = (ir_def_use_edge*) INT_TO_PTR(PTR_TO_INT(skipped_pred->out) + 1);
}
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) {
+static int count_outs(ir_graph *irg)
+{
ir_node *n;
- int res;
+ int i, res;
inc_irg_visited(irg);
res = _count_outs(get_irg_end(irg));
- /* now handle special nodes */
- n = get_irg_frame(irg);
- if (irn_not_visited(n)) {
- n->out = (ir_node **)1;
- ++res;
- }
-
- n = get_irg_args(irg);
- if (irn_not_visited(n)) {
- n->out = (ir_node **)1;
- ++res;
+ /* Now handle anchored nodes. We need the out count of those
+ even if they are not visible. */
+ for (i = anchor_last; i >= anchor_first; --i) {
+ n = get_irg_anchor(irg, i);
+ if (!irn_visited_else_mark(n)) {
+ n->out = (ir_def_use_edge*) INT_TO_PTR(1);
+ ++res;
+ }
}
-
return res;
}
/**
* Enter memory for the outs to a node.
*
- * @param n current node
+ * @param use 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, irn_arity;
- ir_node *pred;
+static ir_def_use_edge *_set_out_edges(ir_node *use, ir_def_use_edge *free)
+{
+ int start, i, irn_arity, pos;
+ size_t n_outs;
- set_irn_visited(n, get_irg_visited(current_ir_graph));
+ mark_irn_visited(use);
/* Allocate my array */
- n_outs = PTR_TO_INT(n->out);
- n->out = free;
+ n_outs = PTR_TO_INT(use->out);
+ use->out = free;
#ifdef DEBUG_libfirm
- n->out_valid = 1;
+ 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. */
- n->out[0] = (ir_node *)0;
+ use->out[0].pos = 0;
- start = is_Block(n) ? 0 : -1;
- irn_arity = get_irn_arity(n);
+ start = is_Block(use) ? 0 : -1;
+ irn_arity = get_irn_arity(use);
for (i = start; i < irn_arity; ++i) {
- pred = get_irn_n(n, i);
+ ir_node *def = get_irn_n(use, i);
+
/* Recursion */
- if (get_irn_visited(pred) < get_irg_visited(current_ir_graph))
- free = _set_out_edges(pred, free);
- /* Remember our back edge */
- pred->out[get_irn_n_outs(pred)+1] = n;
- pred->out[0] = INT_TO_PTR(get_irn_n_outs(pred) + 1);
+ if (!irn_visited(def))
+ free = _set_out_edges(def, free);
+
+ /* 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;
}
return free;
}
*
* @return The next free address
*/
-static ir_node **set_out_edges(ir_graph *irg, ir_node **free) {
- ir_node *n, *special[2];
- int i, n_outs;
+static ir_def_use_edge *set_out_edges(ir_graph *irg, ir_def_use_edge *free)
+{
+ ir_node *n;
+ int i;
inc_irg_visited(irg);
free = _set_out_edges(get_irg_end(irg), free);
- /* handle special nodes */
- special[0] = get_irg_frame(irg);
- special[1] = get_irg_args(irg);
-
- for (i = 1; i >= 0; --i) {
- n = special[i];
-
- if (get_irn_visited(n) < get_irg_visited(current_ir_graph)) {
- n_outs = PTR_TO_INT(n->out);
+ /* handle anchored nodes */
+ for (i = anchor_last; i >= anchor_first; --i) {
+ n = get_irg_anchor(irg, i);
+ if (!irn_visited_else_mark(n)) {
+ size_t n_outs = PTR_TO_INT(n->out);
n->out = free;
#ifdef DEBUG_libfirm
n->out_valid = 1;
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;
- ir_node *startbl = get_irg_start_block(irg);
- int i;
-
- if (get_Block_n_cfg_outs(startbl)) {
- for (i = get_irn_n_outs(startbl) - 1; i >= 0; --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));
- set_irn_out(proj, 1, startbl);
- }
- }
-}
-
-/* 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_node **end = NULL; /* Only for debugging */
+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(current_ir_graph);
/* 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 = xcalloc(n_out_edges, sizeof(irg->outs[0]));
+ irg->outs = XMALLOCNZ(ir_def_use_edge, n_out_edges);
#ifdef DEBUG_libfirm
irg->n_outs = n_out_edges;
#endif /* defined DEBUG_libfirm */
/* 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
- the out block walker. */
- fix_start_proj(irg);
-
- current_ir_graph->outs_state = outs_consistent;
+ add_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_OUTS);
current_ir_graph = rem;
}
-void assure_irg_outs(ir_graph *irg) {
- if (get_irg_outs_state(irg) != outs_consistent)
+void assure_irg_outs(ir_graph *irg)
+{
+ 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)
+void compute_irp_outs(void)
+{
+ size_t i, n;
+ for (i = 0, n = get_irp_n_irgs(); i < n; ++i)
compute_irg_outs(get_irp_irg(i));
}
-void free_irp_outs(void) {
- int i;
- for (i = get_irp_n_irgs() -1; i >= 0; --i)
+void free_irp_outs(void)
+{
+ size_t i, n;
+ for (i = 0, n = get_irp_n_irgs(); i < n; ++i)
free_irg_outs(get_irp_irg(i));
}
-
-/*------------------------------------------------------------*
- * 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) {
- (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_TO_PTR(PTR_TO_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 = PTR_TO_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;
- (void) env;
-
- for (i = start; i < arity; ++i) {
- succ = get_irn_n(node, i);
- succ->out[get_irn_n_outs(succ)+1] = node;
- succ->out[0] = INT_TO_PTR(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_irg_outs(ir_graph *irg) {
+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
projects / libfirm / blobdiff