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.
24 #include "tr_inheritance.h"
25 #include "irtypeinfo.h"
27 #include "irsimpletype.h"
33 /* - statistics ---------------------------------------------- */
35 static int n_casts_normalized = 0;
36 static int n_casts_removed = 0;
37 static int n_sels_concretized = 0;
39 /* - Cast normalization. ------------------------------------- */
41 static type *default_gen_pointer_type_to(type *tp);
43 #define PTR_TYPE_SUFFIX "cc_ptr_tp" /* class cast pointer type. */
44 static ident *ptr_type_suffix = NULL;
45 static gen_pointer_type_to_func gen_pointer_type_to = default_gen_pointer_type_to;
47 static type *default_gen_pointer_type_to(type *tp) {
49 if (get_trouts_state() == outs_consistent) {
50 if (get_type_n_pointertypes_to(tp) > 0) {
51 res = get_type_pointertype_to(tp, 0);
53 ir_mode *mode = mode_P_data;
55 if (is_Method_type(tp))
57 res = new_type_pointer_mode(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode);
58 /* Update trout for pointertypes, so we can use it in next call. */
59 add_type_pointertype_to(tp, res);
62 res = find_pointer_type_to_type(tp);
63 if (res == firm_unknown_type)
64 res = new_type_pointer_mode(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode_P_data);
70 /* Return a type that is a depth times pointer to type. */
71 static type *pointerize_type(type *tp, int depth) {
72 for (; depth > 0; --depth) {
73 tp = gen_pointer_type_to(tp);
79 static ir_node *normalize_values_type(type *totype, ir_node *pred) {
80 type *fromtype = get_irn_typeinfo_type(pred);
81 ir_node *new_cast = pred;
84 if (totype == fromtype) return pred; /* Case for optimization! */
86 while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
87 totype = get_pointer_points_to_type(totype);
88 fromtype = get_pointer_points_to_type(fromtype);
92 if (!is_Class_type(totype)) return pred;
93 if (!is_Class_type(fromtype)) return pred;
95 if ((get_class_supertype_index(totype, fromtype) != -1) ||
96 (get_class_supertype_index(fromtype, totype) != -1) ) {
97 /* It's just what we want ... */
101 set_cur_block(get_nodes_block(pred));
103 if (is_subclass_of(totype, fromtype)) {
105 while (get_class_subtype_index(fromtype, totype) == -1) {
106 /* Insert a cast to a subtype of fromtype. */
107 type *new_type = NULL;
109 int i, n_subtypes = get_class_n_subtypes(fromtype);
110 for (i = 0; i < n_subtypes && !new_type; ++i) {
111 type *new_sub = get_class_subtype(fromtype, i);
112 if (is_superclass_of(new_sub, totype))
117 new_type = pointerize_type(new_type, ref_depth);
118 new_cast = new_Cast(pred, new_type);
120 n_casts_normalized ++;
121 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
122 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
126 assert(is_superclass_of(totype, fromtype));
128 while (get_class_supertype_index(fromtype, totype) == -1) {
129 /* Insert a cast to a supertype of fromtype. */
130 type *new_type = NULL;
131 int i, n_supertypes = get_class_n_supertypes(fromtype);
132 for (i = 0; i < n_supertypes && !new_type; ++i) {
133 type *new_super = get_class_supertype(fromtype, i);
134 if (is_subclass_of(new_super, totype))
135 new_type = new_super;
139 new_type = pointerize_type(new_type, ref_depth);
140 new_cast = new_Cast(pred, new_type);
142 n_casts_normalized ++;
143 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
144 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
151 static void normalize_irn_class_cast(ir_node *n, void *env) {
153 if (get_irn_op(n) == op_Cast) {
154 ir_node *pred = get_Cast_op(n);
155 type *totype = get_Cast_type(n);
156 res = normalize_values_type(totype, pred);
158 } else if (get_irn_op(n) == op_Call) {
159 int i, n_params = get_Call_n_params(n);
160 type *tp = get_Call_type(n);
161 for (i = 0; i < n_params; ++i) {
162 res = normalize_values_type(get_method_param_type(tp, i), get_Call_param(n, i));
163 set_Call_param(n, i, res);
169 static void pure_normalize_irg_class_casts(ir_graph *irg) {
170 assert(get_irg_class_cast_state(irg) != ir_class_casts_any &&
171 "Cannot normalize irregular casts.");
172 if (get_irg_class_cast_state(irg) == ir_class_casts_normalized) {
173 verify_irg_class_cast_state(irg);
177 irg_walk_graph(irg, NULL, normalize_irn_class_cast, NULL);
178 set_irg_class_cast_state(irg, ir_class_casts_normalized);
182 void normalize_irg_class_casts(ir_graph *irg, gen_pointer_type_to_func gppt_fct) {
183 assert(get_irp_typeinfo_state() == ir_typeinfo_consistent);
185 if (gppt_fct) gen_pointer_type_to = gppt_fct;
187 if (!ptr_type_suffix)
188 ptr_type_suffix = new_id_from_str(PTR_TYPE_SUFFIX);
190 pure_normalize_irg_class_casts(irg);
192 gen_pointer_type_to = default_gen_pointer_type_to;
195 void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct) {
196 int i, n_irgs = get_irp_n_irgs();
197 if (gppt_fct) gen_pointer_type_to = gppt_fct;
199 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
200 simple_analyse_types();
202 for (i = 0; i < n_irgs; ++i) {
203 pure_normalize_irg_class_casts(get_irp_irg(i));
206 set_irp_class_cast_state(ir_class_casts_normalized);
207 gen_pointer_type_to = default_gen_pointer_type_to;
209 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
210 printf(" Cast normalization: %d Casts inserted.\n", n_casts_normalized);
216 /* - Cast optimization. ------------------------------------------- */
218 static void cancel_out_casts(ir_node *cast) {
219 ir_node *orig, *pred = get_Cast_op(cast);
220 type *tp_cast, *tp_pred, *tp_orig;
223 if (get_irn_op(pred) != op_Cast) return;
224 orig = get_Cast_op(pred);
226 tp_cast = get_Cast_type(cast);
227 tp_pred = get_Cast_type(pred);
228 tp_orig = get_irn_typeinfo_type(orig);
230 while (is_Pointer_type(tp_cast) &&
231 is_Pointer_type(tp_pred) &&
232 is_Pointer_type(tp_orig) ) {
233 tp_cast = get_pointer_points_to_type(tp_cast);
234 tp_pred = get_pointer_points_to_type(tp_pred);
235 tp_orig = get_pointer_points_to_type(tp_orig);
239 if (!is_Class_type(tp_cast)) return;
240 if (!is_Class_type(tp_pred)) return;
241 if (!is_Class_type(tp_orig)) return;
243 if (is_subclass_of(tp_pred, tp_cast) && get_opt_suppress_downcast_optimization())
246 if (tp_cast == tp_orig) {
247 exchange(cast, orig);
248 n_casts_removed += 2;
252 if (!(is_subclass_of (tp_cast, tp_orig) || is_subclass_of (tp_orig, tp_cast)))
253 /* Avoid (B2)(A)(new B1()) --> (B2)(new B1()) */
256 if ((is_subclass_of (tp_cast, tp_pred) && is_superclass_of(tp_pred, tp_orig)) ||
257 (is_superclass_of(tp_cast, tp_pred) && is_subclass_of (tp_pred, tp_orig)) ) {
258 set_Cast_op (cast, orig);
263 static void concretize_selected_entity(ir_node *sel) {
264 ir_node *cast, *ptr = get_Sel_ptr(sel);
265 type *orig_tp, *cast_tp;
266 entity *new_ent, *sel_ent;
268 sel_ent = get_Sel_entity(sel);
269 cast = get_Sel_ptr(sel);
271 while (get_irn_op(cast) == op_Cast) {
272 cast_tp = get_Cast_type(cast);
273 ptr = get_Cast_op(cast);
274 orig_tp = get_irn_typeinfo_type(ptr);
276 if (!is_Pointer_type(orig_tp)) return;
277 if (!is_Pointer_type(cast_tp)) return;
278 orig_tp = get_pointer_points_to_type(orig_tp);
279 cast_tp = get_pointer_points_to_type(cast_tp);
280 if (!is_Class_type(orig_tp)) return;
281 if (!is_Class_type(cast_tp)) return;
283 /* We only want to contretize, but not generalize. */
284 if (!is_superclass_of(cast_tp, orig_tp)) return;
286 /* Hmm, we are not properly typed. */
287 if (get_class_member_index(cast_tp, sel_ent) == -1) return;
289 new_ent = resolve_ent_polymorphy(orig_tp, sel_ent);
291 /* New ent must be member of orig_tp. */
292 if (get_class_member_index(orig_tp, new_ent) == -1) return;
294 set_Sel_entity(sel, new_ent);
295 set_Sel_ptr(sel, ptr);
296 n_sels_concretized++;
303 static void concretize_Phi_type(ir_node *phi) {
304 int i, n_preds = get_Phi_n_preds(phi);
305 ir_node **pred = alloca(n_preds * sizeof(ir_node *));
307 type *totype, *fromtype;
309 if (n_preds == 0) return;
310 pred[0] = get_Phi_pred(phi, 0);
312 if (get_irn_op(pred[0]) != op_Cast) return;
314 if (!is_Cast_upcast(pred[0])) return;
316 fromtype = get_irn_typeinfo_type(get_Cast_op(pred[0]));
317 totype = get_Cast_type(pred[0]);
319 pred[0] = get_Cast_op(pred[0]);
320 for (i = 1; i < n_preds; ++i) {
321 pred[i] = get_Phi_pred(phi, i);
322 if (get_irn_op(pred[i]) != op_Cast) return;
323 if (get_irn_typeinfo_type(get_Cast_op(pred[i])) != fromtype) return;
324 pred[i] = get_Cast_op(pred[i]);
328 set_cur_block(get_nodes_block(phi));
329 new = new_Phi(n_preds, pred, get_irn_mode(phi));
330 set_irn_typeinfo_type(new, fromtype);
331 new = new_Cast(new, totype);
332 set_irn_typeinfo_type(new, totype);
336 void remove_Cmp_Null_cast(ir_node *cmp) {
337 ir_node *cast, *null, *new_null;
338 int cast_pos, null_pos;
341 cast = get_Cmp_left(cmp);
343 if (get_irn_op(cast) != op_Cast) {
346 cast = get_Cmp_right(cmp);
348 if (get_irn_op(cast) != op_Cast) return;
350 null = get_Cmp_right(cmp);
354 if (get_irn_op(null) != op_Const) return;
355 if (!mode_is_reference(get_irn_mode(null))) return;
356 if (get_Const_tarval(null) != get_mode_null(get_irn_mode(null))) return;
359 set_irn_n(cmp, cast_pos, get_Cast_op(cast));
360 fromtype = get_irn_typeinfo_type(get_Cast_op(cast));
361 new_null = new_Const_type(get_Const_tarval(null), fromtype);
362 set_irn_typeinfo_type(new_null, fromtype);
363 set_irn_n(cmp, null_pos, new_null);
367 static void irn_optimize_class_cast(ir_node *n, void *env) {
368 if (get_irn_op(n) == op_Cast)
370 else if (get_irn_op(n) == op_Sel)
371 concretize_selected_entity(n);
372 else if (get_irn_op(n) == op_Phi)
373 concretize_Phi_type(n);
374 else if (get_irn_op(n) == op_Cmp)
375 remove_Cmp_Null_cast(n);
378 void optimize_class_casts(void) {
379 int i, n_irgs = get_irp_n_irgs();
381 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
382 simple_analyse_types();
384 all_irg_walk(NULL, irn_optimize_class_cast, NULL);
386 set_trouts_inconsistent();
387 for (i = 0; i < n_irgs; ++i)
388 set_irg_outs_inconsistent(get_irp_irg(i));
390 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
391 printf(" Cast optimization: %d Casts removed, %d sels concretized.\n",
392 n_casts_removed, n_sels_concretized);