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 res = new_type_pointer(mangle_u(get_type_ident(tp), ptr_type_suffix), tp);
54 /* Update trout for pointertypes, so we can use it in next call. */
55 add_type_pointertype_to(tp, res);
58 res = find_pointer_type_to_type(tp);
59 if (res == firm_unknown_type)
60 res = new_type_pointer(mangle_u(get_type_ident(tp), ptr_type_suffix), tp);
66 /* Return a type that is a depth times pointer to type. */
67 static type *pointerize_type(type *tp, int depth) {
68 for (; depth > 0; --depth) {
69 tp = gen_pointer_type_to(tp);
75 static ir_node *normalize_values_type(type *totype, ir_node *pred) {
76 type *fromtype = get_irn_typeinfo_type(pred);
77 ir_node *new_cast = pred;
80 if (totype == fromtype) return pred; /* Case for optimization! */
82 while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
83 totype = get_pointer_points_to_type(totype);
84 fromtype = get_pointer_points_to_type(fromtype);
88 if (!is_Class_type(totype)) return pred;
89 if (!is_Class_type(fromtype)) return pred;
91 if ((get_class_supertype_index(totype, fromtype) != -1) ||
92 (get_class_supertype_index(fromtype, totype) != -1) ) {
93 /* It's just what we want ... */
97 set_cur_block(get_nodes_block(pred));
99 if (is_subclass_of(totype, fromtype)) {
101 while (get_class_subtype_index(fromtype, totype) == -1) {
102 /* Insert a cast to a subtype of fromtype. */
103 type *new_type = NULL;
105 int i, n_subtypes = get_class_n_subtypes(fromtype);
106 for (i = 0; i < n_subtypes && !new_type; ++i) {
107 type *new_sub = get_class_subtype(fromtype, i);
108 if (is_superclass_of(new_sub, totype))
113 new_type = pointerize_type(new_type, ref_depth);
114 new_cast = new_Cast(pred, new_type);
116 n_casts_normalized ++;
117 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
118 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
122 assert(is_superclass_of(totype, fromtype));
124 while (get_class_supertype_index(fromtype, totype) == -1) {
125 /* Insert a cast to a supertype of fromtype. */
126 type *new_type = NULL;
127 int i, n_supertypes = get_class_n_supertypes(fromtype);
128 for (i = 0; i < n_supertypes && !new_type; ++i) {
129 type *new_super = get_class_supertype(fromtype, i);
130 if (is_subclass_of(new_super, totype))
131 new_type = new_super;
135 new_type = pointerize_type(new_type, ref_depth);
136 new_cast = new_Cast(pred, new_type);
138 n_casts_normalized ++;
139 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
140 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
147 static void normalize_irn_class_cast(ir_node *n, void *env) {
149 if (get_irn_op(n) == op_Cast) {
150 ir_node *pred = get_Cast_op(n);
151 type *totype = get_Cast_type(n);
152 res = normalize_values_type(totype, pred);
154 } else if (get_irn_op(n) == op_Call) {
155 int i, n_params = get_Call_n_params(n);
156 type *tp = get_Call_type(n);
157 for (i = 0; i < n_params; ++i) {
158 res = normalize_values_type(get_method_param_type(tp, i), get_Call_param(n, i));
159 set_Call_param(n, i, res);
165 static void pure_normalize_irg_class_casts(ir_graph *irg) {
166 assert(get_irg_class_cast_state(irg) != ir_class_casts_any &&
167 "Cannot normalize irregular casts.");
168 if (get_irg_class_cast_state(irg) == ir_class_casts_normalized) {
169 verify_irg_class_cast_state(irg);
173 irg_walk_graph(irg, NULL, normalize_irn_class_cast, NULL);
174 set_irg_class_cast_state(irg, ir_class_casts_normalized);
178 void normalize_irg_class_casts(ir_graph *irg, gen_pointer_type_to_func gppt_fct) {
179 assert(get_irp_typeinfo_state() == ir_typeinfo_consistent);
181 if (gppt_fct) gen_pointer_type_to = gppt_fct;
183 if (!ptr_type_suffix)
184 ptr_type_suffix = new_id_from_str(PTR_TYPE_SUFFIX);
186 pure_normalize_irg_class_casts(irg);
188 gen_pointer_type_to = default_gen_pointer_type_to;
191 void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct) {
192 int i, n_irgs = get_irp_n_irgs();
193 if (gppt_fct) gen_pointer_type_to = gppt_fct;
195 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
196 simple_analyse_types();
198 for (i = 0; i < n_irgs; ++i) {
199 pure_normalize_irg_class_casts(get_irp_irg(i));
202 set_irp_class_cast_state(ir_class_casts_normalized);
203 gen_pointer_type_to = default_gen_pointer_type_to;
205 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
206 printf(" Cast normalization: %d Casts inserted.\n", n_casts_normalized);
212 /* - Cast optimization. ------------------------------------------- */
214 static void cancel_out_casts(ir_node *cast) {
215 ir_node *orig, *pred = get_Cast_op(cast);
216 type *tp_cast, *tp_pred, *tp_orig;
219 if (get_irn_op(pred) != op_Cast) return;
220 orig = get_Cast_op(pred);
222 tp_cast = get_Cast_type(cast);
223 tp_pred = get_Cast_type(pred);
224 tp_orig = get_irn_typeinfo_type(orig);
226 while (is_Pointer_type(tp_cast) &&
227 is_Pointer_type(tp_pred) &&
228 is_Pointer_type(tp_orig) ) {
229 tp_cast = get_pointer_points_to_type(tp_cast);
230 tp_pred = get_pointer_points_to_type(tp_pred);
231 tp_orig = get_pointer_points_to_type(tp_orig);
235 if (!is_Class_type(tp_cast)) return;
236 if (!is_Class_type(tp_pred)) return;
237 if (!is_Class_type(tp_orig)) return;
239 if (is_subclass_of(tp_pred, tp_cast) && get_opt_suppress_downcast_optimization())
242 if (tp_cast == tp_orig) {
243 exchange(cast, orig);
244 n_casts_removed += 2;
248 if (!(is_subclass_of (tp_cast, tp_orig) || is_subclass_of (tp_orig, tp_cast)))
249 /* Avoid (B2)(A)(new B1()) --> (B2)(new B1()) */
252 if ((is_subclass_of (tp_cast, tp_pred) && is_superclass_of(tp_pred, tp_orig)) ||
253 (is_superclass_of(tp_cast, tp_pred) && is_subclass_of (tp_pred, tp_orig)) ) {
254 set_Cast_op (cast, orig);
259 static void concretize_selected_entity(ir_node *sel) {
260 ir_node *cast, *ptr = get_Sel_ptr(sel);
261 type *orig_tp, *cast_tp;
262 entity *new_ent, *sel_ent;
264 sel_ent = get_Sel_entity(sel);
265 cast = get_Sel_ptr(sel);
267 while (get_irn_op(cast) == op_Cast) {
268 cast_tp = get_Cast_type(cast);
269 ptr = get_Cast_op(cast);
270 orig_tp = get_irn_typeinfo_type(ptr);
272 if (!is_Pointer_type(orig_tp)) return;
273 if (!is_Pointer_type(cast_tp)) return;
274 orig_tp = get_pointer_points_to_type(orig_tp);
275 cast_tp = get_pointer_points_to_type(cast_tp);
276 if (!is_Class_type(orig_tp)) return;
277 if (!is_Class_type(cast_tp)) return;
279 /* We only want to contretize, but not generalize. */
280 if (!is_superclass_of(cast_tp, orig_tp)) return;
282 /* Hmm, we are not properly typed. */
283 if (get_class_member_index(cast_tp, sel_ent) == -1) return;
285 new_ent = resolve_ent_polymorphy(orig_tp, sel_ent);
287 /* New ent must be member of orig_tp. */
288 if (get_class_member_index(orig_tp, new_ent) == -1) return;
290 set_Sel_entity(sel, new_ent);
291 set_Sel_ptr(sel, ptr);
292 n_sels_concretized++;
299 static void concretize_Phi_type(ir_node *phi) {
300 int i, n_preds = get_Phi_n_preds(phi);
301 ir_node **pred = alloca(n_preds * sizeof(ir_node *));
303 type *totype, *fromtype;
305 if (n_preds == 0) return;
306 pred[0] = get_Phi_pred(phi, 0);
308 if (get_irn_op(pred[0]) != op_Cast) return;
310 if (!is_Cast_upcast(pred[0])) return;
312 fromtype = get_irn_typeinfo_type(get_Cast_op(pred[0]));
313 totype = get_Cast_type(pred[0]);
315 pred[0] = get_Cast_op(pred[0]);
316 for (i = 1; i < n_preds; ++i) {
317 pred[i] = get_Phi_pred(phi, i);
318 if (get_irn_op(pred[i]) != op_Cast) return;
319 if (get_irn_typeinfo_type(get_Cast_op(pred[i])) != fromtype) return;
320 pred[i] = get_Cast_op(pred[i]);
324 set_cur_block(get_nodes_block(phi));
325 new = new_Phi(n_preds, pred, get_irn_mode(phi));
326 set_irn_typeinfo_type(new, fromtype);
327 new = new_Cast(new, totype);
328 set_irn_typeinfo_type(new, totype);
332 void remove_Cmp_Null_cast(ir_node *cmp) {
333 ir_node *cast, *null, *new_null;
334 int cast_pos, null_pos;
337 cast = get_Cmp_left(cmp);
339 if (get_irn_op(cast) != op_Cast) {
342 cast = get_Cmp_right(cmp);
344 if (get_irn_op(cast) != op_Cast) return;
346 null = get_Cmp_right(cmp);
350 if (get_irn_op(null) != op_Const) return;
351 if (!mode_is_reference(get_irn_mode(null))) return;
352 if (get_Const_tarval(null) != get_mode_null(get_irn_mode(null))) return;
355 set_irn_n(cmp, cast_pos, get_Cast_op(cast));
356 fromtype = get_irn_typeinfo_type(get_Cast_op(cast));
357 new_null = new_Const_type(get_Const_tarval(null), fromtype);
358 set_irn_typeinfo_type(new_null, fromtype);
359 set_irn_n(cmp, null_pos, new_null);
363 static void irn_optimize_class_cast(ir_node *n, void *env) {
364 if (get_irn_op(n) == op_Cast)
366 else if (get_irn_op(n) == op_Sel)
367 concretize_selected_entity(n);
368 else if (get_irn_op(n) == op_Phi)
369 concretize_Phi_type(n);
370 else if (get_irn_op(n) == op_Cmp)
371 remove_Cmp_Null_cast(n);
374 void optimize_class_casts(void) {
375 int i, n_irgs = get_irp_n_irgs();
377 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
378 simple_analyse_types();
380 all_irg_walk(NULL, irn_optimize_class_cast, NULL);
382 set_trouts_inconsistent();
383 for (i = 0; i < n_irgs; ++i)
384 set_irg_outs_inconsistent(get_irp_irg(i));
386 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
387 printf(" Cast optimization: %d Casts removed, %d sels concretized.\n",
388 n_casts_removed, n_sels_concretized);