5 * File name: ir/opt/tropt.c
6 * Purpose: Optimize the type representation.
7 * Author: Goetz Lindenmaier
11 * Copyright: (c) 2005 Universität Karlsruhe
12 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
14 * Perform optimizations of the type representation.
33 #include "tr_inheritance.h"
34 #include "irtypeinfo.h"
36 #include "irsimpletype.h"
42 /* - statistics ---------------------------------------------- */
44 static int n_casts_normalized = 0;
45 static int n_casts_removed = 0;
46 static int n_sels_concretized = 0;
48 /* - Cast normalization. ------------------------------------- */
50 static type *default_gen_pointer_type_to(type *tp);
52 #define PTR_TYPE_SUFFIX "cc_ptr_tp" /* class cast pointer type. */
53 static ident *ptr_type_suffix = NULL;
54 static gen_pointer_type_to_func gen_pointer_type_to = default_gen_pointer_type_to;
57 * Find a pointer type to a given type.
58 * Uses and updates trouts if available.
60 static type *default_gen_pointer_type_to(type *tp) {
62 if (get_trouts_state() == outs_consistent) {
63 if (get_type_n_pointertypes_to(tp) > 0) {
64 res = get_type_pointertype_to(tp, 0);
66 ir_mode *mode = is_Method_type(tp) ? mode_P_code : mode_P_data;
68 res = new_type_pointer(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode);
69 /* Update trout for pointer types, so we can use it in next call. */
70 add_type_pointertype_to(tp, res);
74 res = find_pointer_type_to_type(tp);
75 if (res == firm_unknown_type)
76 res = new_type_pointer(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode_P_data);
82 /** Return a type that is a depth times pointer to type. */
83 static type *pointerize_type(type *tp, int depth) {
84 for (; depth > 0; --depth) {
85 tp = gen_pointer_type_to(tp);
91 static ir_node *normalize_values_type(type *totype, ir_node *pred) {
92 type *fromtype = get_irn_typeinfo_type(pred);
93 ir_node *new_cast = pred;
96 if (totype == fromtype) return pred; /* Case for optimization! */
98 while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
99 totype = get_pointer_points_to_type(totype);
100 fromtype = get_pointer_points_to_type(fromtype);
104 if (!is_Class_type(totype)) return pred;
105 if (!is_Class_type(fromtype)) return pred;
107 if ((get_class_supertype_index(totype, fromtype) != -1) ||
108 (get_class_supertype_index(fromtype, totype) != -1) ) {
109 /* It's just what we want ... */
113 set_cur_block(get_nodes_block(pred));
115 if (is_subclass_of(totype, fromtype)) {
117 while (get_class_subtype_index(fromtype, totype) == -1) {
118 /* Insert a cast to a subtype of fromtype. */
119 type *new_type = NULL;
121 int i, n_subtypes = get_class_n_subtypes(fromtype);
122 for (i = 0; i < n_subtypes && !new_type; ++i) {
123 type *new_sub = get_class_subtype(fromtype, i);
124 if (is_superclass_of(new_sub, totype))
129 new_type = pointerize_type(new_type, ref_depth);
130 new_cast = new_Cast(pred, new_type);
132 n_casts_normalized ++;
133 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
134 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
138 assert(is_superclass_of(totype, fromtype));
140 while (get_class_supertype_index(fromtype, totype) == -1) {
141 /* Insert a cast to a supertype of fromtype. */
142 type *new_type = NULL;
143 int i, n_supertypes = get_class_n_supertypes(fromtype);
144 for (i = 0; i < n_supertypes && !new_type; ++i) {
145 type *new_super = get_class_supertype(fromtype, i);
146 if (is_subclass_of(new_super, totype))
147 new_type = new_super;
151 new_type = pointerize_type(new_type, ref_depth);
152 new_cast = new_Cast(pred, new_type);
154 n_casts_normalized ++;
155 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
156 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
163 static void normalize_irn_class_cast(ir_node *n, void *env) {
165 if (get_irn_op(n) == op_Cast) {
166 ir_node *pred = get_Cast_op(n);
167 type *totype = get_Cast_type(n);
168 res = normalize_values_type(totype, pred);
170 } else if (get_irn_op(n) == op_Call) {
171 int i, n_params = get_Call_n_params(n);
172 type *tp = get_Call_type(n);
173 for (i = 0; i < n_params; ++i) {
174 res = normalize_values_type(get_method_param_type(tp, i), get_Call_param(n, i));
175 set_Call_param(n, i, res);
181 static void pure_normalize_irg_class_casts(ir_graph *irg) {
182 assert(get_irg_class_cast_state(irg) != ir_class_casts_any &&
183 "Cannot normalize irregular casts.");
184 if (get_irg_class_cast_state(irg) == ir_class_casts_normalized) {
185 verify_irg_class_cast_state(irg);
189 irg_walk_graph(irg, NULL, normalize_irn_class_cast, NULL);
190 set_irg_class_cast_state(irg, ir_class_casts_normalized);
194 void normalize_irg_class_casts(ir_graph *irg, gen_pointer_type_to_func gppt_fct) {
195 assert(get_irp_typeinfo_state() == ir_typeinfo_consistent);
197 if (gppt_fct) gen_pointer_type_to = gppt_fct;
199 if (!ptr_type_suffix)
200 ptr_type_suffix = new_id_from_str(PTR_TYPE_SUFFIX);
202 pure_normalize_irg_class_casts(irg);
204 gen_pointer_type_to = default_gen_pointer_type_to;
207 void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct) {
208 int i, n_irgs = get_irp_n_irgs();
209 if (gppt_fct) gen_pointer_type_to = gppt_fct;
211 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
212 simple_analyse_types();
214 for (i = 0; i < n_irgs; ++i) {
215 pure_normalize_irg_class_casts(get_irp_irg(i));
218 set_irp_class_cast_state(ir_class_casts_normalized);
219 gen_pointer_type_to = default_gen_pointer_type_to;
221 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
222 printf(" Cast normalization: %d Casts inserted.\n", n_casts_normalized);
228 /* - Cast optimization. ------------------------------------------- */
233 * (T1)(T2)x<T1> -> x<T1>
235 * (T3)(T2)x<T1> -> (T3)x<T1>
239 static void cancel_out_casts(ir_node *cast) {
240 ir_node *orig, *pred = get_Cast_op(cast);
241 type *tp_cast, *tp_pred, *tp_orig;
244 if (get_irn_op(pred) != op_Cast) return;
245 orig = get_Cast_op(pred);
247 tp_cast = get_Cast_type(cast);
248 tp_pred = get_Cast_type(pred);
249 tp_orig = get_irn_typeinfo_type(orig);
251 while (is_Pointer_type(tp_cast) &&
252 is_Pointer_type(tp_pred) &&
253 is_Pointer_type(tp_orig) ) {
254 tp_cast = get_pointer_points_to_type(tp_cast);
255 tp_pred = get_pointer_points_to_type(tp_pred);
256 tp_orig = get_pointer_points_to_type(tp_orig);
260 if (!is_Class_type(tp_cast)) return;
261 if (!is_Class_type(tp_pred)) return;
262 if (!is_Class_type(tp_orig)) return;
264 if (is_subclass_of(tp_pred, tp_cast) && get_opt_suppress_downcast_optimization())
267 if (tp_cast == tp_orig) {
268 exchange(cast, orig);
269 n_casts_removed += 2;
273 if (!(is_subclass_of (tp_cast, tp_orig) || is_subclass_of (tp_orig, tp_cast))) {
274 /* Avoid (B2)(A)(new B1()) --> (B2)(new B1())
275 * if B1 =!> B2 and B2 =!> B1
280 if ((is_subclass_of (tp_cast, tp_pred) && is_superclass_of(tp_pred, tp_orig)) ||
281 (is_superclass_of(tp_cast, tp_pred) && is_subclass_of (tp_pred, tp_orig)) ) {
282 /* Cast --> Pred --> Orig */
283 set_Cast_op (cast, orig);
288 static void concretize_selected_entity(ir_node *sel) {
289 ir_node *cast, *ptr = get_Sel_ptr(sel);
290 type *orig_tp, *cast_tp;
291 entity *new_ent, *sel_ent;
293 sel_ent = get_Sel_entity(sel);
294 cast = get_Sel_ptr(sel);
296 while (get_irn_op(cast) == op_Cast) {
297 cast_tp = get_Cast_type(cast);
298 ptr = get_Cast_op(cast);
299 orig_tp = get_irn_typeinfo_type(ptr);
301 if (!is_Pointer_type(orig_tp)) return;
302 if (!is_Pointer_type(cast_tp)) return;
303 orig_tp = get_pointer_points_to_type(orig_tp);
304 cast_tp = get_pointer_points_to_type(cast_tp);
305 if (!is_Class_type(orig_tp)) return;
306 if (!is_Class_type(cast_tp)) return;
308 /* We only want to concretize, but not generalize. */
309 if (!is_superclass_of(cast_tp, orig_tp)) return;
311 /* Hmm, we are not properly typed. */
312 if (get_class_member_index(cast_tp, sel_ent) == -1) return;
314 new_ent = resolve_ent_polymorphy(orig_tp, sel_ent);
316 /* New ent must be member of orig_tp. */
317 if (get_class_member_index(orig_tp, new_ent) == -1) return;
319 set_Sel_entity(sel, new_ent);
320 set_Sel_ptr(sel, ptr);
321 n_sels_concretized++;
328 static void concretize_Phi_type(ir_node *phi) {
329 int i, n_preds = get_Phi_n_preds(phi);
330 ir_node **pred = alloca(n_preds * sizeof(ir_node *));
332 type *totype, *fromtype;
334 if (n_preds == 0) return;
335 pred[0] = get_Phi_pred(phi, 0);
337 if (get_irn_op(pred[0]) != op_Cast) return;
339 if (!is_Cast_upcast(pred[0])) return;
341 fromtype = get_irn_typeinfo_type(get_Cast_op(pred[0]));
342 totype = get_Cast_type(pred[0]);
344 pred[0] = get_Cast_op(pred[0]);
345 for (i = 1; i < n_preds; ++i) {
346 pred[i] = get_Phi_pred(phi, i);
347 if (get_irn_op(pred[i]) != op_Cast) return;
348 if (get_irn_typeinfo_type(get_Cast_op(pred[i])) != fromtype) return;
349 pred[i] = get_Cast_op(pred[i]);
353 set_cur_block(get_nodes_block(phi));
354 new = new_Phi(n_preds, pred, get_irn_mode(phi));
355 set_irn_typeinfo_type(new, fromtype);
356 new = new_Cast(new, totype);
357 set_irn_typeinfo_type(new, totype);
361 void remove_Cmp_Null_cast(ir_node *cmp) {
362 ir_node *cast, *null, *new_null;
363 int cast_pos, null_pos;
366 cast = get_Cmp_left(cmp);
368 if (get_irn_op(cast) != op_Cast) {
371 cast = get_Cmp_right(cmp);
373 if (get_irn_op(cast) != op_Cast) return;
375 null = get_Cmp_right(cmp);
379 if (get_irn_op(null) != op_Const) return;
380 if (!mode_is_reference(get_irn_mode(null))) return;
381 if (get_Const_tarval(null) != get_mode_null(get_irn_mode(null))) return;
384 set_irn_n(cmp, cast_pos, get_Cast_op(cast));
385 fromtype = get_irn_typeinfo_type(get_Cast_op(cast));
386 new_null = new_Const_type(get_Const_tarval(null), fromtype);
387 set_irn_typeinfo_type(new_null, fromtype);
388 set_irn_n(cmp, null_pos, new_null);
395 static void irn_optimize_class_cast(ir_node *n, void *env) {
396 if (get_irn_op(n) == op_Cast)
398 else if (get_irn_op(n) == op_Sel)
399 concretize_selected_entity(n);
400 else if (get_irn_op(n) == op_Phi)
401 concretize_Phi_type(n);
402 else if (get_irn_op(n) == op_Cmp)
403 remove_Cmp_Null_cast(n);
406 void optimize_class_casts(void) {
407 int i, n_irgs = get_irp_n_irgs();
409 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
410 simple_analyse_types();
412 all_irg_walk(NULL, irn_optimize_class_cast, NULL);
414 set_trouts_inconsistent();
415 for (i = 0; i < n_irgs; ++i)
416 set_irg_outs_inconsistent(get_irp_irg(i));
418 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
419 printf(" Cast optimization: %d Casts removed, %d sels concretized.\n",
420 n_casts_removed, n_sels_concretized);