/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
/**
* @file
* @brief Implementation of cdep
+ * @author Christoph Mallon
* @version $Id$
*/
#include <assert.h>
#include "pmap.h"
#include "obst.h"
#include "xmalloc.h"
-#include "cdep.h"
+#include "cdep_t.h"
#include "irprintf.h"
#include "irdump.h"
static cdep_info *cdep_data;
+ir_node *(get_cdep_node)(const ir_cdep *cdep)
+{
+ return _get_cdep_node(cdep);
+}
+
+ir_cdep *(get_cdep_next)(const ir_cdep *cdep)
+{
+ return _get_cdep_next(cdep);
+}
+
/* Return a list of all control dependences of a block. */
-ir_cdep *find_cdep(const ir_node *block) {
- return pmap_get(cdep_data->cdep_map, (void *)block);
+ir_cdep *find_cdep(const ir_node *block)
+{
+ assert(is_Block(block));
+ return (ir_cdep*) pmap_get(cdep_data->cdep_map, block);
}
-/* Replace the control dependence info of old by the info of nw. */
-void exchange_cdep(ir_node *old, const ir_node *nw) {
+void exchange_cdep(ir_node *old, const ir_node *nw)
+{
ir_cdep *cdep = find_cdep(nw);
+ assert(is_Block(old));
pmap_insert(cdep_data->cdep_map, old, cdep);
}
/**
* Adds a control dependence from node to dep_on.
*/
-static void add_cdep(ir_node *node, ir_node *dep_on) {
+static void add_cdep(ir_node *node, ir_node *dep_on)
+{
ir_cdep *dep = find_cdep(node);
-#if 0
- ir_fprintf(stderr, "Adding cdep of %+F on %+F\n", node, dep_on);
-#endif
+ assert(is_Block(dep_on));
if (dep == NULL) {
- ir_cdep *newdep = obstack_alloc(&cdep_data->obst, sizeof(*newdep));
+ ir_cdep *newdep = OALLOC(&cdep_data->obst, ir_cdep);
newdep->node = dep_on;
newdep->next = NULL;
ir_cdep *newdep;
for (;;) {
- if (dep->node == dep_on) return;
+ if (get_cdep_node(dep) == dep_on) return;
if (dep->next == NULL) break;
dep = dep->next;
}
- newdep = obstack_alloc(&cdep_data->obst, sizeof(*newdep));
+ newdep = OALLOC(&cdep_data->obst, ir_cdep);
newdep->node = dep_on;
newdep->next = NULL;
dep->next = newdep;
/**
* Pre-block-walker: calculate the control dependence
*/
-static void cdep_pre(ir_node *node, void *ctx) {
- cdep_env *env = ctx;
- unsigned int n;
- unsigned int i;
+static void cdep_pre(ir_node *node, void *ctx)
+{
+ cdep_env *env = (cdep_env*) ctx;
+ int i;
/* special case:
* start and end block have no control dependency
if (node == env->start_block) return;
if (node == env->end_block) return;
- n = get_Block_n_cfgpreds(node);
- for (i = 0; i < n; i++) {
+ for (i = get_Block_n_cfgpreds(node) - 1; i >= 0; --i) {
ir_node *pred = get_Block_cfgpred_block(node, i);
ir_node *pdom;
ir_node *dependee;
{
ir_cdep *cd;
-#if 0
- ir_node *pdom = get_Block_ipostdom(block);
- if (pdom != NULL) {
- fprintf(
- F,
- "edge:{sourcename:\"n%ld\" targetname:\"n%ld\" color:gold}\n",
- get_irn_node_nr(pdom), get_irn_node_nr(block)
- );
- }
-#endif
-
for (cd = find_cdep(block); cd != NULL; cd = cd->next) {
fprintf(
F,
return 0;
}
-/* Compute the control dependence graph for a graph. */
-void compute_cdep(ir_graph *irg) {
- ir_node *start_block, *rem;
+void compute_cdep(ir_graph *irg)
+{
+ ir_node *rem;
cdep_env env;
free_cdep(irg);
- cdep_data = xmalloc(sizeof(*cdep_data));
+ cdep_data = XMALLOC(cdep_info);
obstack_init(&cdep_data->obst);
cdep_data->cdep_map = pmap_create();
the ipdom of the startblock is the end block.
Firm does NOT add the phantom edge from Start to End.
*/
- start_block = get_irg_start_block(irg);
- rem = get_Block_ipostdom(start_block);
- set_Block_ipostdom(start_block, get_irg_end_block(irg));
-
env.start_block = get_irg_start_block(irg);
env.end_block = get_irg_end_block(irg);
+
+ rem = get_Block_ipostdom(env.start_block);
+ set_Block_ipostdom(env.start_block, env.end_block);
+
irg_block_walk_graph(irg, cdep_pre, NULL, &env);
#if 0
#endif
/* restore the post dominator relation */
- set_Block_ipostdom(start_block, rem);
+ set_Block_ipostdom(env.start_block, rem);
}
-/* Free the control dependence info. */
-void free_cdep(ir_graph *irg) {
+void free_cdep(ir_graph *irg)
+{
(void) irg;
if (cdep_data != NULL) {
pmap_destroy(cdep_data->cdep_map);
}
}
-/* Check whether dependee is (directly) control dependent on candidate. */
-int is_cdep_on(const ir_node *dependee, const ir_node *candidate) {
+int is_cdep_on(const ir_node *dependee, const ir_node *candidate)
+{
const ir_cdep *dep;
for (dep = find_cdep(dependee); dep != NULL; dep = dep->next) {
- if (dep->node == candidate) return 1;
+ if (get_cdep_node(dep) == candidate) return 1;
}
return 0;
}
-/* Check whether dependee is (possible iterated) control dependent on candidate. */
-int is_iterated_cdep_on(ir_node *dependee, ir_node *candidate) {
- const ir_cdep *dep;
-
- while ((dep = find_cdep(dependee)) != NULL) {
- if (dep->next != NULL) return 0;
- if (dep->node == candidate) return 1;
- dependee = dep->node;
- }
- return 0;
-}
-
-/* If block is control dependent on exactly one node, return this node, else NULL. */
-ir_node *get_unique_cdep(const ir_node *block) {
+ir_node *get_unique_cdep(const ir_node *block)
+{
ir_cdep *cdep = find_cdep(block);
- return cdep != NULL && cdep->next == NULL ? cdep->node : NULL;
+ return cdep != NULL && cdep->next == NULL ? get_cdep_node(cdep) : NULL;
}
-/* Check if the given block is control dependent of more than one node. */
-int has_multiple_cdep(const ir_node *block) {
+int has_multiple_cdep(const ir_node *block)
+{
ir_cdep *cdep = find_cdep(block);
return cdep != NULL && cdep->next != NULL;
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