-/* Eindeutige Adresse zur Markierung von besuchten Knoten und zur
- * Darstellung der unbekannten Methode. */
+/* unambiguous address used as a mark. */
static void *MARK = &MARK;
static eset *entities = NULL;
*/
static void sel_methods_walker(ir_node * node, void *env) {
pmap *ldname_map = env;
+ entity **arr;
/* Call standard optimizations */
if (get_irn_op(node) == op_Sel) {
ir_node *new_node = optimize_in_place(node);
- if (node != new_node) exchange(node, new_node);
+ if (node != new_node)
+ exchange(node, new_node);
}
/* replace SymConst(name)-operations by SymConst(ent) */
assert(get_entity_peculiarity(ent) != peculiarity_inherited);
if (!eset_contains(entities, ent)) {
- /* Entity noch nicht behandelt. Alle (intern oder extern)
- * implementierten Methoden suchen, die diese Entity
- * überschreiben. Die Menge an entity.link speichern. */
+ /* Entity not yet handled. Find all (internal or external)
+ * implemented methods that overwrites this entity.
+ * This set is stored in the entity link. */
set_entity_link(ent, get_impl_methods(ent));
eset_insert(entities, ent);
}
/* -- As an add on we get an optimization that removes polymorphic calls.
- This optimization is more powerful than that in transform_node_Sel. -- */
- if (get_entity_link(ent) == NULL) {
- /* Die Sel-Operation kann nie einen Zeiger auf eine aufrufbare
- * Methode zurückgeben. Damit ist sie insbesondere nicht
- * ausführbar und nicht erreichbar. */
- /* It may be description: We call a method in a dead part of the program. */
+ This optimization is more powerful than that in transform_node_Sel(). -- */
+ arr = get_entity_link(ent);
+ if (arr == NULL) {
+ /*
+ * The Sel node never returns a pointer to a usable method.
+ * We could not call it, but it may be description:
+ * We call a method in a dead part of the program.
+ */
assert (get_entity_peculiarity(ent) == peculiarity_description);
- } else {
- entity ** arr = get_entity_link(ent);
- if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
- (ARR_LEN(arr) == 1 && arr[0] != NULL)) {
- ir_node *new_node;
- /* Die Sel-Operation kann immer nur _einen_ Wert auf eine
- * interne Methode zurückgeben. Wir können daher die
- * Sel-Operation durch eine Const- bzw. SymConst-Operation
- * ersetzen. */
- set_irg_current_block(current_ir_graph, get_nodes_block(node));
- assert(get_entity_peculiarity(get_SymConst_entity(get_atomic_ent_value(arr[0]))) ==
- peculiarity_existent);
- new_node = copy_const_value(get_atomic_ent_value(arr[0]));
- DBG_OPT_POLY(node, new_node);
- exchange (node, new_node);
- }
+ }
+ else if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
+ (ARR_LEN(arr) == 1 && arr[0] != NULL)) {
+ ir_node *new_node;
+
+ /*
+ * The Sel node returns only one possible method.
+ * So we could replace the Sel node by a SymConst.
+ * This method must exists.
+ */
+ set_irg_current_block(current_ir_graph, get_nodes_block(node));
+ assert(get_entity_peculiarity(get_SymConst_entity(get_atomic_ent_value(arr[0]))) ==
+ peculiarity_existent);
+ new_node = copy_const_value(get_irn_dbg_info(node), get_atomic_ent_value(arr[0]));
+ DBG_OPT_POLY(node, new_node);
+ exchange(node, new_node);
}
}
}
/** Initialize auxiliary data structures.
*
* Computes a set of entities that overwrite an entity and contain
- * an impelementation. The set is stored in the entity's link field.
+ * an implementation. The set is stored in the entity's link field.
*
* Further replaces Sel nodes where this set contains exactly one
* method by SymConst nodes.
entities = eset_create();
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
entity * ent = get_irg_entity(get_irp_irg(i));
- /* Nur extern sichtbare Methoden können überhaupt mit SymConst_ptr_name
- * aufgerufen werden. */
+ /* only external visible methods are allowed to call by a SymConst_ptr_name */
if (get_entity_visibility(ent) != visibility_local) {
pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
}
/**
* Returns an array of all methods that could be called at a Sel node.
* This array contains every entry only once.
+ *
+ * @param sel the Sel node
*/
static entity ** get_Sel_arr(ir_node * sel) {
static entity ** NULL_ARRAY = NULL;
/**
* Returns the number of possible called methods at a Sel node.
+ *
+ * @param sel the Sel node
*/
static int get_Sel_n_methods(ir_node * sel) {
return ARR_LEN(get_Sel_arr(sel));
case iro_Start:
case iro_Alloc:
case iro_Load:
- /* nothing: Die Operationen werden in "free_ana_walker" selbst
+ /* nothing: Die Operationen werden in free_ana_walker() selbst
* behandelt. */
break;
set_irn_link(node, NULL);
}
-
-static void free_mark(ir_node * node, eset * set) {
+/**
+ * Called for predecessors nodes of "interesting" ones.
+ * Interesting ones include all nodes that can somehow make
+ * a method visible.
+ *
+ * If a method (or a set of methods in case of polymorph calls) gets visible,
+ * add it to the set of 'free' methods
+ *
+ * @param node the current visited node
+ * @param set the set of all free methods
+ */
+static void free_mark(ir_node *node, eset * set) {
int i;
- if (get_irn_link(node) == MARK) {
+ if (get_irn_link(node) == MARK)
return; /* already visited */
- }
+
set_irn_link(node, MARK);
+
switch (get_irn_opcode(node)) {
case iro_Sel: {
entity * ent = get_Sel_entity(node);
set_irn_link(node, NULL);
}
-
-static void free_ana_walker(ir_node * node, eset * set) {
+/**
+ * post-walker. Find method addresses.
+ */
+static void free_ana_walker(ir_node *node, void *env) {
+ eset *set = env;
int i;
+
if (get_irn_link(node) == MARK) {
- /* bereits in einem Zyklus besucht. */
+ /* already visited */
return;
}
switch (get_irn_opcode(node)) {
* Verräter ist. */
case iro_Call:
set_irn_link(node, MARK);
- for (i = get_Call_arity(node) - 1; i >= 0; --i) {
- ir_node * pred = get_Call_param(node, i);
+ for (i = get_Call_n_params(node) - 1; i >= 0; --i) {
+ ir_node *pred = get_Call_param(node, i);
if (mode_is_reference(get_irn_mode(pred))) {
free_mark(pred, set);
}
set_irn_link(node, NULL);
}
-/* Die Datenstrukturen für sel-Methoden (sel_methods) muß vor dem
+/**
+ * Add all method addresses in global initializers to the set.
+ *
+ * @note
+ * We do NOT check the type here, just it it's an entity address.
+ * The reason for this is code like:
+ *
+ * void *p = function;
+ *
+ * which is sometimes used to anchor functions.
+ */
+static void add_method_address(entity *ent, eset *set)
+{
+ ir_node *n;
+ type *tp;
+ int i;
+
+ /* do not check uninitialized values */
+ if (get_entity_variability(ent) == variability_uninitialized)
+ return;
+
+ if (is_atomic_entity(ent)) {
+ tp = get_entity_type(ent);
+
+ /* ignore methods: these of course reference it's address */
+ if (is_Method_type(tp))
+ return;
+
+ /* let's check if it's the address of a function */
+ n = get_atomic_ent_value(ent);
+ if (get_irn_op(n) == op_SymConst) {
+ if (get_SymConst_kind(n) == symconst_addr_ent) {
+ ent = get_SymConst_entity(n);
+
+ if (is_Method_type(get_entity_type(ent)))
+ eset_insert(set, ent);
+ }
+ }
+ }
+ else {
+ for (i = get_compound_ent_n_values(ent) - 1; i >= 0; --i) {
+ n = get_compound_ent_value(ent, i);
+
+ /* let's check if it's the address of a function */
+ if (get_irn_op(n) == op_SymConst) {
+ if (get_SymConst_kind(n) == symconst_addr_ent) {
+ entity *ent = get_SymConst_entity(n);
+
+ if (is_Method_type(get_entity_type(ent)))
+ eset_insert(set, ent);
+ }
+ }
+ }
+ }
+}
+
+/**
+ * returns a list of 'free' methods, i.e., the methods that can be called
+ * from external or via function pointers.
+ *
+ * Die Datenstrukturen für sel-Methoden (sel_methods) muß vor dem
* Aufruf von "get_free_methods" aufgebaut sein. Die (internen)
* SymConst(name)-Operationen müssen in passende SymConst(ent)-Operationen
* umgewandelt worden sein, d.h. SymConst-Operationen verweisen immer
- * auf eine echt externe Methode. */
+ * auf eine echt externe Methode.
+ */
static entity ** get_free_methods(void)
{
- eset * set = eset_create();
+ eset *free_set = eset_create();
int i;
- entity ** arr = NEW_ARR_F(entity *, 0);
- entity * ent;
+ entity **arr = NEW_ARR_F(entity *, 0);
+ entity *ent;
+ ir_graph *irg;
+ type *glob;
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- ir_graph * irg = get_irp_irg(i);
- entity * ent = get_irg_entity(irg);
+ irg = get_irp_irg(i);
+ ent = get_irg_entity(irg);
/* insert "external visible" methods. */
if (get_entity_visibility(ent) != visibility_local) {
- eset_insert(set, ent);
+ eset_insert(free_set, ent);
}
/* Finde alle Methoden die in dieser Methode extern sichtbar werden,
z.B. da die Adresse einer Methode abgespeichert wird. */
- irg_walk_graph(irg, NULL, (irg_walk_func *) free_ana_walker, set);
+ irg_walk_graph(irg, NULL, free_ana_walker, free_set);
}
/* insert sticky methods, too */
for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
- entity * ent = get_irg_entity(get_irp_irg(i));
- /* insert "external visible" methods. */
+ ent = get_irg_entity(get_irp_irg(i));
+ /* insert "sticky" methods. */
if (get_entity_stickyness (ent) == stickyness_sticky) {
- eset_insert(set, ent);
+ eset_insert(free_set, ent);
}
}
- /* Hauptprogramm ist auch dann frei, wenn es nicht "external
- * visible" ist. */
- if (get_irp_main_irg()) {
- eset_insert(set, get_irg_entity(get_irp_main_irg()));
+ /* insert all methods the initializes global variables */
+ glob = get_glob_type();
+ for (i = get_class_n_members(glob) - 1; i >= 0; --i) {
+ ent = get_class_member(glob, i);
+
+ add_method_address(ent, free_set);
}
- /* Wandle Menge in Feld um. Effizienter. */
- for (ent = eset_first(set); ent; ent = eset_next(set)) {
+
+ /* the main program is even then "free", if it's not external visible. */
+ irg = get_irp_main_irg();
+ if (irg)
+ eset_insert(free_set, get_irg_entity(irg));
+
+ /* Finally, transform the set into an array. */
+ for (ent = eset_first(free_set); ent; ent = eset_next(free_set)) {
ARR_APP1(entity *, arr, ent);
}
- eset_destroy(set);
+ eset_destroy(free_set);
return arr;
}
}
void free_irp_callee_info(void) {
- int i, n_irgs = get_irp_n_irgs();
- for (i = 0; i < n_irgs; ++i) {
+ int i;
+ for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
free_callee_info(get_irp_irg(i));
}
}
* This optimization performs the following transformations for
* all ir graphs:
* - All SymConst operations that refer to intern methods are replaced
- * by Const operations refering to the corresponding entity.
+ * by Const operations referring to the corresponding entity.
* - Sel nodes, that select entities that are not overwritten are
- * replaced by Const nodes refering to the selected entity.
+ * replaced by Const nodes referring to the selected entity.
* - Sel nodes, for which no method exists at all are replaced by Bad
* nodes.
* - Sel nodes with a pointer input that is an Alloc node are replaced
- * by Const nodes refering to the entity that implements the method in
+ * by Const nodes referring to the entity that implements the method in
* the type given by the Alloc node.
*/
void opt_call_addrs(void) {
projects / libfirm / blobdiff