#include "irgwalk.h"
#include "irnode.h"
#include "pmap.h"
+#include "obst.h"
#include "xmalloc.h"
#include "cdep.h"
#include "irprintf.h"
#include "irdump.h"
+typedef struct cdep_info {
+ pmap *cdep_map; /**< A map to find the list of all control dependence nodes for a block. */
+ struct obstack obst; /**< An obstack where all cdep data lives on. */
+} cdep_info;
-static pmap *cdep_map;
+static cdep_info *cdep_data;
-ir_cdep *find_cdep(const ir_node *block)
-{
- return pmap_get(cdep_map, (void *)block);
+/* 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);
}
-
-void exchange_cdep(ir_node *old, const ir_node *nw)
-{
+/* Replace the control dependence info of old by the info of nw. */
+void exchange_cdep(ir_node *old, const ir_node *nw) {
ir_cdep *cdep = find_cdep(nw);
-
- pmap_insert(cdep_map, old, cdep);
+ pmap_insert(cdep_data->cdep_map, old, cdep);
}
-
-static void add_cdep(ir_node* node, ir_node* dep_on)
-{
+/**
+ * Adds a control dependence from node to 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
if (dep == NULL) {
- ir_cdep *newdep = xmalloc(sizeof(*newdep));
+ ir_cdep *newdep = obstack_alloc(&cdep_data->obst, sizeof(*newdep));
newdep->node = dep_on;
newdep->next = NULL;
- pmap_insert(cdep_map, node, newdep);
+ pmap_insert(cdep_data->cdep_map, node, newdep);
} else {
ir_cdep *newdep;
if (dep->next == NULL) break;
dep = dep->next;
}
- newdep = xmalloc(sizeof(*newdep));
+ newdep = obstack_alloc(&cdep_data->obst, sizeof(*newdep));
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)
-{
+static void cdep_pre(ir_node *node, void *ctx) {
cdep_env *env = ctx;
unsigned int n;
unsigned int i;
return 0;
}
-
-void compute_cdep(ir_graph *irg)
-{
+/* Compute the control dependence graph for a graph. */
+void compute_cdep(ir_graph *irg) {
ir_node *start_block, *rem;
cdep_env env;
- cdep_map = pmap_create();
+ free_cdep(irg);
+ cdep_data = xmalloc(sizeof(*cdep_data));
+ obstack_init(&cdep_data->obst);
+
+ cdep_data->cdep_map = pmap_create();
assure_postdoms(irg);
set_Block_ipostdom(start_block, rem);
}
-
-void free_cdep(ir_graph *irg)
-{
+/* Free the control dependence info. */
+void free_cdep(ir_graph *irg) {
(void) irg;
- // TODO atm leaking more memory than a small memory leaking animal
+ if (cdep_data != NULL) {
+ pmap_destroy(cdep_data->cdep_map);
+ obstack_free(&cdep_data->obst, NULL);
+ xfree(cdep_data);
+ cdep_data = NULL;
+ }
}
-
-int is_cdep_on(const ir_node *dependee, const ir_node *candidate)
-{
+/* Check whether dependee is (directly) control dependent on 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) {
return 0;
}
-
-int is_iterated_cdep_on(ir_node *dependee, ir_node *candidate)
-{
+/* 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) {
return 0;
}
-
-ir_node *get_unique_cdep(const ir_node *block)
-{
+/* If block is control dependent on exactly one node, return this node, else NULL. */
+ir_node *get_unique_cdep(const ir_node *block) {
ir_cdep *cdep = find_cdep(block);
return cdep != NULL && cdep->next == NULL ? cdep->node : NULL;
}
-
-int has_multiple_cdep(const ir_node *block)
-{
+/* Check if the given block is control dependent of more than one node. */
+int has_multiple_cdep(const ir_node *block) {
ir_cdep *cdep = find_cdep(block);
return cdep != NULL && cdep->next != NULL;