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);
74 static void normalize_irn_class_cast(ir_node *n, void *env) {
75 if (get_irn_op(n) != op_Cast) return;
78 type *fromtype = get_irn_typeinfo_type(get_Cast_op(n));
79 type *totype = get_Cast_type(n);
82 if (totype == fromtype) return; /* Case for optimization! */
84 while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
85 totype = get_pointer_points_to_type(totype);
86 fromtype = get_pointer_points_to_type(fromtype);
90 if (!is_Class_type(totype)) return;
91 if (!is_Class_type(fromtype)) return;
93 if ((get_class_supertype_index(totype, fromtype) != -1) ||
94 (get_class_supertype_index(fromtype, totype) != -1) ) {
95 /* It's just what we want ... */
99 set_cur_block(get_nodes_block(n));
101 if (is_subclass_of(totype, fromtype)) {
103 while (get_class_subtype_index(fromtype, totype) == -1) {
104 /* Insert a cast to a subtype of fromtype. */
105 type *new_type = NULL;
107 int i, n_subtypes = get_class_n_subtypes(fromtype);
108 for (i = 0; i < n_subtypes && !new_type; ++i) {
109 type *new_sub = get_class_subtype(fromtype, i);
110 if (is_superclass_of(new_sub, totype))
115 new_type = pointerize_type(new_type, ref_depth);
116 new_cast = new_Cast(get_Cast_op(n), new_type);
117 n_casts_normalized ++;
118 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
119 set_Cast_op(n, new_cast);
120 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
124 assert(is_superclass_of(totype, fromtype));
126 while (get_class_supertype_index(fromtype, totype) == -1) {
127 /* Insert a cast to a supertype of fromtype. */
128 type *new_type = NULL;
130 int i, n_supertypes = get_class_n_supertypes(fromtype);
131 for (i = 0; i < n_supertypes && !new_type; ++i) {
132 type *new_super = get_class_supertype(fromtype, i);
133 if (is_subclass_of(new_super, totype))
134 new_type = new_super;
138 new_type = pointerize_type(new_type, ref_depth);
139 new_cast = new_Cast(get_Cast_op(n), new_type);
140 n_casts_normalized ++;
141 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
142 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
143 set_Cast_op(n, new_cast);
149 static void pure_normalize_irg_class_casts(ir_graph *irg) {
150 assert(get_irg_class_cast_state(irg) != ir_class_casts_any &&
151 "Cannot normalize irregular casts.");
152 if (get_irg_class_cast_state(irg) == ir_class_casts_normalized) {
153 verify_irg_class_cast_state(irg);
157 irg_walk_graph(irg, NULL, normalize_irn_class_cast, NULL);
158 set_irg_class_cast_state(irg, ir_class_casts_normalized);
162 void normalize_irg_class_casts(ir_graph *irg, gen_pointer_type_to_func gppt_fct) {
163 assert(get_irp_typeinfo_state() == ir_typeinfo_consistent);
165 if (gppt_fct) gen_pointer_type_to = gppt_fct;
167 if (!ptr_type_suffix)
168 ptr_type_suffix = new_id_from_str(PTR_TYPE_SUFFIX);
170 pure_normalize_irg_class_casts(irg);
172 gen_pointer_type_to = default_gen_pointer_type_to;
175 void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct) {
176 int i, n_irgs = get_irp_n_irgs();
177 if (gppt_fct) gen_pointer_type_to = gppt_fct;
179 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
180 simple_analyse_types();
182 for (i = 0; i < n_irgs; ++i) {
183 pure_normalize_irg_class_casts(get_irp_irg(i));
186 set_irp_class_cast_state(ir_class_casts_normalized);
187 gen_pointer_type_to = default_gen_pointer_type_to;
189 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
190 printf(" Cast normalization: %d Casts inserted.\n", n_casts_normalized);
196 /* - Cast optimization. ------------------------------------------- */
198 static void cancel_out_casts(ir_node *cast) {
199 ir_node *orig, *pred = get_Cast_op(cast);
200 type *tp_cast, *tp_pred, *tp_orig;
203 if (get_irn_op(pred) != op_Cast) return;
204 orig = get_Cast_op(pred);
206 tp_cast = get_Cast_type(cast);
207 tp_pred = get_Cast_type(pred);
208 tp_orig = get_irn_typeinfo_type(orig);
210 while (is_Pointer_type(tp_cast) &&
211 is_Pointer_type(tp_pred) &&
212 is_Pointer_type(tp_orig) ) {
213 tp_cast = get_pointer_points_to_type(tp_cast);
214 tp_pred = get_pointer_points_to_type(tp_pred);
215 tp_orig = get_pointer_points_to_type(tp_orig);
219 if (!is_Class_type(tp_cast)) return;
220 if (!is_Class_type(tp_pred)) return;
221 if (!is_Class_type(tp_orig)) return;
223 if (is_subclass_of(tp_pred, tp_cast) && get_opt_suppress_downcast_optimization())
226 if (tp_cast == tp_orig) {
227 exchange(cast, orig);
228 n_casts_removed += 2;
232 if (!(is_subclass_of (tp_cast, tp_orig) || is_subclass_of (tp_orig, tp_cast)))
233 /* Avoid (B2)(A)(new B1()) --> (B2)(new B1()) */
236 if ((is_subclass_of (tp_cast, tp_pred) && is_superclass_of(tp_pred, tp_orig)) ||
237 (is_superclass_of(tp_cast, tp_pred) && is_subclass_of (tp_pred, tp_orig)) ) {
238 set_Cast_op (cast, orig);
243 static void concretize_selected_entity(ir_node *sel) {
244 ir_node *cast, *ptr = get_Sel_ptr(sel);
245 type *orig_tp, *cast_tp;
246 entity *new_ent, *sel_ent;
248 sel_ent = get_Sel_entity(sel);
249 cast = get_Sel_ptr(sel);
251 while (get_irn_op(cast) == op_Cast) {
252 cast_tp = get_Cast_type(cast);
253 ptr = get_Cast_op(cast);
254 orig_tp = get_irn_typeinfo_type(ptr);
256 if (!is_Pointer_type(orig_tp)) return;
257 if (!is_Pointer_type(cast_tp)) return;
258 orig_tp = get_pointer_points_to_type(orig_tp);
259 cast_tp = get_pointer_points_to_type(cast_tp);
260 if (!is_Class_type(orig_tp)) return;
261 if (!is_Class_type(cast_tp)) return;
263 /* We only want to contretize, but not generalize. */
264 if (!is_superclass_of(cast_tp, orig_tp)) return;
266 /* Hmm, we are not properly typed. */
267 if (get_class_member_index(cast_tp, sel_ent) == -1) return;
269 new_ent = resolve_ent_polymorphy(orig_tp, sel_ent);
271 /* New ent must be member of orig_tp. */
272 if (get_class_member_index(orig_tp, new_ent) == -1) return;
274 set_Sel_entity(sel, new_ent);
275 set_Sel_ptr(sel, ptr);
276 n_sels_concretized++;
283 static void concretize_Phi_type(ir_node *phi) {
284 int i, n_preds = get_Phi_n_preds(phi);
285 ir_node **pred = alloca(n_preds * sizeof(ir_node *));
287 type *totype, *fromtype;
289 if (n_preds == 0) return;
290 pred[0] = get_Phi_pred(phi, 0);
292 if (get_irn_op(pred[0]) != op_Cast) return;
294 if (!is_Cast_upcast(pred[0])) return;
296 fromtype = get_irn_typeinfo_type(get_Cast_op(pred[0]));
297 totype = get_Cast_type(pred[0]);
299 pred[0] = get_Cast_op(pred[0]);
300 for (i = 1; i < n_preds; ++i) {
301 pred[i] = get_Phi_pred(phi, i);
302 if (get_irn_op(pred[i]) != op_Cast) return;
303 if (get_irn_typeinfo_type(get_Cast_op(pred[i])) != fromtype) return;
304 pred[i] = get_Cast_op(pred[i]);
308 set_cur_block(get_nodes_block(phi));
309 new = new_Phi(n_preds, pred, get_irn_mode(phi));
310 set_irn_typeinfo_type(new, fromtype);
311 new = new_Cast(new, totype);
312 set_irn_typeinfo_type(new, totype);
316 void remove_Cmp_Null_cast(ir_node *cmp) {
317 ir_node *cast, *null, *new_null;
318 int cast_pos, null_pos;
321 cast = get_Cmp_left(cmp);
323 if (get_irn_op(cast) != op_Cast) {
326 cast = get_Cmp_right(cmp);
328 if (get_irn_op(cast) != op_Cast) return;
330 null = get_Cmp_right(cmp);
334 if (get_irn_op(null) != op_Const) return;
335 if (!mode_is_reference(get_irn_mode(null))) return;
336 if (get_Const_tarval(null) != get_mode_null(get_irn_mode(null))) return;
339 set_irn_n(cmp, cast_pos, get_Cast_op(cast));
340 fromtype = get_irn_typeinfo_type(get_Cast_op(cast));
341 new_null = new_Const_type(get_Const_tarval(null), fromtype);
342 set_irn_typeinfo_type(new_null, fromtype);
343 set_irn_n(cmp, null_pos, new_null);
347 static void irn_optimize_class_cast(ir_node *n, void *env) {
348 if (get_irn_op(n) == op_Cast)
350 else if (get_irn_op(n) == op_Sel)
351 concretize_selected_entity(n);
352 else if (get_irn_op(n) == op_Phi)
353 concretize_Phi_type(n);
354 else if (get_irn_op(n) == op_Cmp)
355 remove_Cmp_Null_cast(n);
358 void optimize_class_casts(void) {
359 int i, n_irgs = get_irp_n_irgs();
361 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
362 simple_analyse_types();
364 all_irg_walk(NULL, irn_optimize_class_cast, NULL);
366 set_trouts_inconsistent();
367 for (i = 0; i < n_irgs; ++i)
368 set_irg_outs_inconsistent(get_irp_irg(i));
370 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
371 printf(" Cast optimization: %d Casts removed, %d sels concretized.\n",
372 n_casts_removed, n_sels_concretized);