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.
34 #include "tr_inheritance.h"
35 #include "irtypeinfo.h"
37 #include "irsimpletype.h"
43 /* - statistics ---------------------------------------------- */
45 static int n_casts_normalized = 0;
46 static int n_casts_removed = 0;
47 static int n_sels_concretized = 0;
49 /* - Cast normalization. ------------------------------------- */
51 static ir_type *default_gen_pointer_type_to(ir_type *tp);
53 #define PTR_TYPE_SUFFIX "cc_ptr_tp" /* class cast pointer type. */
54 static ident *ptr_type_suffix = NULL;
55 static gen_pointer_type_to_func gen_pointer_type_to = default_gen_pointer_type_to;
58 * Find a pointer type to a given type.
59 * Uses and updates trouts if available.
61 static ir_type *default_gen_pointer_type_to(ir_type *tp) {
63 if (get_trouts_state() == outs_consistent) {
64 if (get_type_n_pointertypes_to(tp) > 0) {
65 res = get_type_pointertype_to(tp, 0);
67 ir_mode *mode = is_Method_type(tp) ? mode_P_code : mode_P_data;
69 res = new_type_pointer(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode);
70 /* Update trout for pointer types, so we can use it in next call. */
71 add_type_pointertype_to(tp, res);
75 res = find_pointer_type_to_type(tp);
76 if (res == firm_unknown_type)
77 res = new_type_pointer(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode_P_data);
83 /** Return a type that is a depth times pointer to type. */
84 static ir_type *pointerize_type(ir_type *tp, int depth) {
85 for (; depth > 0; --depth) {
86 tp = gen_pointer_type_to(tp);
92 static ir_node *normalize_values_type(ir_type *totype, ir_node *pred) {
93 ir_type *fromtype = get_irn_typeinfo_type(pred);
94 ir_node *new_cast = pred;
97 if (totype == fromtype) return pred; /* Case for optimization! */
99 while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
100 totype = get_pointer_points_to_type(totype);
101 fromtype = get_pointer_points_to_type(fromtype);
105 if (!is_Class_type(totype)) return pred;
106 if (!is_Class_type(fromtype)) return pred;
108 if ((get_class_supertype_index(totype, fromtype) != -1) ||
109 (get_class_supertype_index(fromtype, totype) != -1) ) {
110 /* It's just what we want ... */
114 set_cur_block(get_nodes_block(pred));
116 if (is_SubClass_of(totype, fromtype)) {
118 while (get_class_subtype_index(fromtype, totype) == -1) {
119 /* Insert a cast to a subtype of fromtype. */
120 ir_type *new_type = NULL;
122 int i, n_subtypes = get_class_n_subtypes(fromtype);
123 for (i = 0; i < n_subtypes && !new_type; ++i) {
124 ir_type *new_sub = get_class_subtype(fromtype, i);
125 if (is_SuperClass_of(new_sub, totype))
130 new_type = pointerize_type(new_type, ref_depth);
131 new_cast = new_Cast(pred, new_type);
133 n_casts_normalized ++;
134 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
135 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
139 assert(is_SuperClass_of(totype, fromtype));
141 while (get_class_supertype_index(fromtype, totype) == -1) {
142 /* Insert a cast to a supertype of fromtype. */
143 ir_type *new_type = NULL;
144 int i, n_supertypes = get_class_n_supertypes(fromtype);
145 for (i = 0; i < n_supertypes && !new_type; ++i) {
146 ir_type *new_super = get_class_supertype(fromtype, i);
147 if (is_SubClass_of(new_super, totype))
148 new_type = new_super;
152 new_type = pointerize_type(new_type, ref_depth);
153 new_cast = new_Cast(pred, new_type);
155 n_casts_normalized ++;
156 set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
157 if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
164 static void normalize_irn_class_cast(ir_node *n, void *env) {
166 if (get_irn_op(n) == op_Cast) {
167 ir_node *pred = get_Cast_op(n);
168 ir_type *totype = get_Cast_type(n);
169 res = normalize_values_type(totype, pred);
171 } else if (get_irn_op(n) == op_Call) {
172 int i, n_params = get_Call_n_params(n);
173 ir_type *tp = get_Call_type(n);
174 for (i = 0; i < n_params; ++i) {
175 res = normalize_values_type(get_method_param_type(tp, i), get_Call_param(n, i));
176 set_Call_param(n, i, res);
182 static void pure_normalize_irg_class_casts(ir_graph *irg) {
183 assert(get_irg_class_cast_state(irg) != ir_class_casts_any &&
184 "Cannot normalize irregular casts.");
185 if (get_irg_class_cast_state(irg) == ir_class_casts_normalized) {
186 verify_irg_class_cast_state(irg);
190 irg_walk_graph(irg, NULL, normalize_irn_class_cast, NULL);
191 set_irg_class_cast_state(irg, ir_class_casts_normalized);
195 void normalize_irg_class_casts(ir_graph *irg, gen_pointer_type_to_func gppt_fct) {
196 assert(get_irp_typeinfo_state() == ir_typeinfo_consistent);
198 if (gppt_fct) gen_pointer_type_to = gppt_fct;
200 if (!ptr_type_suffix)
201 ptr_type_suffix = new_id_from_str(PTR_TYPE_SUFFIX);
203 pure_normalize_irg_class_casts(irg);
205 gen_pointer_type_to = default_gen_pointer_type_to;
208 void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct) {
209 int i, n_irgs = get_irp_n_irgs();
210 if (gppt_fct) gen_pointer_type_to = gppt_fct;
212 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
213 simple_analyse_types();
215 for (i = 0; i < n_irgs; ++i) {
216 pure_normalize_irg_class_casts(get_irp_irg(i));
219 set_irp_class_cast_state(ir_class_casts_normalized);
220 gen_pointer_type_to = default_gen_pointer_type_to;
222 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
223 printf(" Cast normalization: %d Casts inserted.\n", n_casts_normalized);
229 /* - Cast optimization. ------------------------------------------- */
234 * (T1)(T2)x<T1> -> x<T1>
236 * (T3)(T2)x<T1> -> (T3)x<T1>
240 static void cancel_out_casts(ir_node *cast) {
241 ir_node *orig, *pred = get_Cast_op(cast);
242 ir_type *tp_cast, *tp_pred, *tp_orig;
245 if (get_irn_op(pred) != op_Cast) return;
246 orig = get_Cast_op(pred);
248 tp_cast = get_Cast_type(cast);
249 tp_pred = get_Cast_type(pred);
250 tp_orig = get_irn_typeinfo_type(orig);
252 while (is_Pointer_type(tp_cast) &&
253 is_Pointer_type(tp_pred) &&
254 is_Pointer_type(tp_orig) ) {
255 tp_cast = get_pointer_points_to_type(tp_cast);
256 tp_pred = get_pointer_points_to_type(tp_pred);
257 tp_orig = get_pointer_points_to_type(tp_orig);
261 if (!is_Class_type(tp_cast)) return;
262 if (!is_Class_type(tp_pred)) return;
263 if (!is_Class_type(tp_orig)) return;
265 if (is_SubClass_of(tp_pred, tp_cast) && get_opt_suppress_downcast_optimization())
268 if (tp_cast == tp_orig) {
269 exchange(cast, orig);
270 n_casts_removed += 2;
274 if (!(is_SubClass_of (tp_cast, tp_orig) || is_SubClass_of (tp_orig, tp_cast))) {
275 /* Avoid (B2)(A)(new B1()) --> (B2)(new B1())
276 * if B1 =!> B2 and B2 =!> B1
281 if ((is_SubClass_of (tp_cast, tp_pred) && is_SuperClass_of(tp_pred, tp_orig)) ||
282 (is_SuperClass_of(tp_cast, tp_pred) && is_SubClass_of (tp_pred, tp_orig)) ) {
283 /* Cast --> Pred --> Orig */
284 set_Cast_op (cast, orig);
289 static void concretize_selected_entity(ir_node *sel) {
290 ir_node *cast, *ptr = get_Sel_ptr(sel);
291 ir_type *orig_tp, *cast_tp;
292 ir_entity *new_ent, *sel_ent;
294 sel_ent = get_Sel_entity(sel);
295 cast = get_Sel_ptr(sel);
297 while (get_irn_op(cast) == op_Cast) {
298 cast_tp = get_Cast_type(cast);
299 ptr = get_Cast_op(cast);
300 orig_tp = get_irn_typeinfo_type(ptr);
302 if (!is_Pointer_type(orig_tp)) return;
303 if (!is_Pointer_type(cast_tp)) return;
304 orig_tp = get_pointer_points_to_type(orig_tp);
305 cast_tp = get_pointer_points_to_type(cast_tp);
306 if (!is_Class_type(orig_tp)) return;
307 if (!is_Class_type(cast_tp)) return;
309 /* We only want to concretize, but not generalize. */
310 if (!is_SuperClass_of(cast_tp, orig_tp)) return;
312 /* Hmm, we are not properly typed. */
313 if (get_class_member_index(cast_tp, sel_ent) == -1) return;
315 new_ent = resolve_ent_polymorphy(orig_tp, sel_ent);
317 /* New ent must be member of orig_tp. */
318 if (get_class_member_index(orig_tp, new_ent) == -1) return;
320 set_Sel_entity(sel, new_ent);
321 set_Sel_ptr(sel, ptr);
322 n_sels_concretized++;
329 static void concretize_Phi_type(ir_node *phi) {
330 int i, n_preds = get_Phi_n_preds(phi);
331 ir_node **pred = alloca(n_preds * sizeof(ir_node *));
333 ir_type *totype, *fromtype;
335 if (n_preds == 0) return;
336 pred[0] = get_Phi_pred(phi, 0);
338 if (get_irn_op(pred[0]) != op_Cast) return;
340 if (!is_Cast_upcast(pred[0])) return;
342 fromtype = get_irn_typeinfo_type(get_Cast_op(pred[0]));
343 totype = get_Cast_type(pred[0]);
345 pred[0] = get_Cast_op(pred[0]);
346 for (i = 1; i < n_preds; ++i) {
347 pred[i] = get_Phi_pred(phi, i);
348 if (get_irn_op(pred[i]) != op_Cast) return;
349 if (get_irn_typeinfo_type(get_Cast_op(pred[i])) != fromtype) return;
350 pred[i] = get_Cast_op(pred[i]);
354 set_cur_block(get_nodes_block(phi));
355 new = new_Phi(n_preds, pred, get_irn_mode(phi));
356 set_irn_typeinfo_type(new, fromtype);
357 new = new_Cast(new, totype);
358 set_irn_typeinfo_type(new, totype);
362 void remove_Cmp_Null_cast(ir_node *cmp) {
363 ir_node *cast, *null, *new_null;
364 int cast_pos, null_pos;
367 cast = get_Cmp_left(cmp);
369 if (get_irn_op(cast) != op_Cast) {
372 cast = get_Cmp_right(cmp);
374 if (get_irn_op(cast) != op_Cast) return;
376 null = get_Cmp_right(cmp);
380 if (get_irn_op(null) != op_Const) return;
381 if (!mode_is_reference(get_irn_mode(null))) return;
382 if (get_Const_tarval(null) != get_mode_null(get_irn_mode(null))) return;
385 set_irn_n(cmp, cast_pos, get_Cast_op(cast));
386 fromtype = get_irn_typeinfo_type(get_Cast_op(cast));
387 new_null = new_Const_type(get_Const_tarval(null), fromtype);
388 set_irn_typeinfo_type(new_null, fromtype);
389 set_irn_n(cmp, null_pos, new_null);
396 static void irn_optimize_class_cast(ir_node *n, void *env) {
397 if (get_irn_op(n) == op_Cast)
399 else if (get_irn_op(n) == op_Sel)
400 concretize_selected_entity(n);
401 else if (get_irn_op(n) == op_Phi)
402 concretize_Phi_type(n);
403 else if (get_irn_op(n) == op_Cmp)
404 remove_Cmp_Null_cast(n);
407 void optimize_class_casts(void) {
408 int i, n_irgs = get_irp_n_irgs();
410 if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
411 simple_analyse_types();
413 all_irg_walk(NULL, irn_optimize_class_cast, NULL);
415 set_trouts_inconsistent();
416 for (i = 0; i < n_irgs; ++i)
417 set_irg_outs_inconsistent(get_irp_irg(i));
419 if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
420 printf(" Cast optimization: %d Casts removed, %d Sels concretized.\n",
421 n_casts_removed, n_sels_concretized);