2 * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Run most simple type analyses.
23 * @author Goetz Lindenmaier
27 * Runs most simple type analyses.
29 * We compute type information for each node. It is derived from the
30 * types of the origines of values, e.g. parameter types can be derived
31 * from the method type.
32 * The type information so far is saved in the link field.
38 #include "irtypeinfo.h"
39 #include "irsimpletype.h"
48 #define VERBOSE_UNKNOWN_TYPE(s) printf s
50 static ir_type *phi_cycle_type = NULL;
53 /* ------------ Building and Removing the type information ----------- */
57 * init type link field so that types point to their pointers.
59 static void precompute_pointer_types(void) {
62 set_type_link(firm_unknown_type, firm_unknown_type);
63 set_type_link(firm_none_type, firm_unknown_type);
65 for (i = get_irp_n_types() - 1; i >= 0; --i)
66 set_type_link(get_irp_type(i), (void *)firm_unknown_type);
68 for (i = get_irp_n_types() - 1; i >= 0; --i) {
69 ir_type *tp = get_irp_type(i);
70 if (is_Pointer_type(tp))
71 set_type_link(get_pointer_points_to_type(tp), (void *)tp);
79 * Returns a pointer to type which was stored in the link field
82 static ir_type *find_pointer_type_to (ir_type *tp) {
84 return (ir_type *)get_type_link(tp);
86 if (get_type_n_pointertypes_to(tp) > 0)
87 return get_type_pointertype_to(tp, 0);
89 return firm_unknown_type;
93 static ir_type *compute_irn_type(ir_node *n);
96 * Try to determine a type for a Proj node.
97 * If a type cannot be determined, return @p firm_none_type.
99 static ir_type *find_type_for_Proj(ir_node *n) {
102 /* Avoid nested Tuples. */
103 ir_node *pred = skip_Tuple(get_Proj_pred(n));
104 ir_mode *m = get_irn_mode(n);
111 return firm_none_type;
113 switch (get_irn_opcode(pred)) {
116 /* Deal with Start / Call here: we need to know the Proj Nr. */
117 assert(get_irn_mode(pred) == mode_T);
118 pred_pred = get_Proj_pred(pred);
119 if (get_irn_op(pred_pred) == op_Start) {
120 ir_type *mtp = get_entity_type(get_irg_entity(get_irn_irg(pred_pred)));
121 tp = get_method_param_type(mtp, get_Proj_proj(n));
122 } else if (get_irn_op(pred_pred) == op_Call) {
123 ir_type *mtp = get_Call_type(pred_pred);
124 tp = get_method_res_type(mtp, get_Proj_proj(n));
125 } else if (get_irn_op(pred_pred) == op_Tuple) {
126 assert(0 && "Encountered nested Tuple");
128 VERBOSE_UNKNOWN_TYPE(("Proj %ld from Proj from ??: unknown type\n", get_irn_node_nr(n)));
129 tp = firm_unknown_type;
133 /* frame pointer, globals and tls */
134 switch (get_Proj_proj(n)) {
135 case pn_Start_P_frame_base:
136 tp = find_pointer_type_to(get_irg_frame_type(get_irn_irg(pred)));
138 case pn_Start_P_globals:
139 tp = find_pointer_type_to(get_glob_type());
142 tp = find_pointer_type_to(get_tls_type());
144 case pn_Start_P_value_arg_base:
145 VERBOSE_UNKNOWN_TYPE(("Value arg base proj %ld from Start: unknown type\n", get_irn_node_nr(n)));
146 tp = firm_unknown_type; /* find_pointer_type_to(get....(get_entity_type(get_irg_entity(get_irn_irg(pred))))); */
149 VERBOSE_UNKNOWN_TYPE(("Proj %ld %ld from Start: unknown type\n", get_Proj_proj(n), get_irn_node_nr(n)));
150 tp = firm_unknown_type;
154 /* value args pointer */
155 if (get_Proj_proj(n) == pn_Call_P_value_res_base) {
156 VERBOSE_UNKNOWN_TYPE(("Value res base Proj %ld from Call: unknown type\n", get_irn_node_nr(n)));
157 tp = firm_unknown_type; /* find_pointer_type_to(get....get_Call_type(pred)); */
159 VERBOSE_UNKNOWN_TYPE(("Proj %ld %ld from Call: unknown type\n", get_Proj_proj(n), get_irn_node_nr(n)));
160 tp = firm_unknown_type;
164 tp = compute_irn_type(get_Tuple_pred(pred, get_Proj_proj(n)));
167 tp = compute_irn_type(pred);
174 * Try to determine the type of a node.
175 * If a type cannot be determined, return @p firm_none_type.
177 static ir_type *find_type_for_node(ir_node *n) {
178 ir_type *tp = firm_unknown_type;
179 ir_type *tp1 = NULL, *tp2 = NULL;
180 ir_node *a = NULL, *b = NULL;
186 tp1 = compute_irn_type(a);
189 a = get_binop_left(n);
190 b = get_binop_right(n);
191 tp1 = compute_irn_type(a);
192 tp2 = compute_irn_type(b);
195 switch (get_irn_opcode(n)) {
198 assert(0 && "op_InstOf not supported");
203 /* Check returned type. */
206 ir_type *meth_type = get_entity_type(get_irg_entity(current_ir_graph));
207 for (i = 0; i < get_method_n_ress(meth_type); i++) {
208 ir_type *res_type = get_method_res_type(meth_type, i);
209 ir_type *ana_res_type = get_irn_type(get_Return_res(n, i));
210 if (ana_res_type == firm_unknown_type) continue;
211 if (res_type != ana_res_type && "return value has wrong type") {
213 assert(res_type == ana_res_type && "return value has wrong type");
238 /* compute the type */
239 case iro_Const: tp = get_Const_type(n); break;
241 tp = get_SymConst_value_type(n); break;
243 tp = find_pointer_type_to(get_entity_type(get_Sel_entity(n))); break;
244 /* asymmetric binops */
251 tp = get_Cast_type(n); break;
254 int n_preds = get_Phi_n_preds(n);
259 /* initialize this Phi */
260 set_irn_typeinfo_type(n, phi_cycle_type);
262 /* find a first real type */
263 for (i = 0; i < n_preds; ++i) {
264 tp1 = compute_irn_type(get_Phi_pred(n, i));
265 assert(tp1 != initial_type);
266 if ((tp1 != phi_cycle_type) && (tp1 != firm_none_type))
270 /* find a second real type */
272 for (; (i < n_preds); ++i) {
273 tp2 = compute_irn_type(get_Phi_pred(n, i));
274 if ((tp2 == phi_cycle_type) || (tp2 == firm_none_type)) {
278 if (tp2 != tp1) break;
281 /* printf("Types in Phi %s and %s \n", get_type_name(tp1), get_type_name(tp2)); */
283 if (tp1 == tp2) { tp = tp1; break; }
285 if (get_firm_verbosity() > 55) { // Do not commit 55! should be 1.
286 VERBOSE_UNKNOWN_TYPE(("Phi %ld with two different types: %s, %s: unknown type.\n", get_irn_node_nr(n),
287 get_type_name(tp1), get_type_name(tp2)));
289 tp = firm_unknown_type; /* Test for supertypes? */
292 ir_node *a = get_Load_ptr(n);
294 tp = get_entity_type(get_Sel_entity(a));
295 else if (is_Pointer_type(compute_irn_type(a))) {
296 tp = get_pointer_points_to_type(get_irn_typeinfo_type(a));
297 if (is_Array_type(tp))
298 tp = get_array_element_type(tp);
300 VERBOSE_UNKNOWN_TYPE(("Load %ld with typeless address. result: unknown type\n", get_irn_node_nr(n)));
304 tp = find_pointer_type_to(get_Alloc_type(n)); break;
306 tp = find_type_for_Proj(n); break;
308 tp = compute_irn_type(get_Id_pred(n)); break;
310 tp = firm_unknown_type; break;
312 assert(0 && "Filter not implemented"); break;
314 /* catch special cases with fallthrough to binop/unop cases in default. */
316 if (mode_is_int(get_irn_mode(n)) &&
317 mode_is_reference(get_irn_mode(a)) &&
318 mode_is_reference(get_irn_mode(b)) ) {
319 VERBOSE_UNKNOWN_TYPE(("Sub %ld ptr - ptr = int: unknown type\n", get_irn_node_nr(n)));
320 tp = firm_unknown_type; break;
322 } /* fall through to Add. */
324 if (mode_is_reference(get_irn_mode(n)) &&
325 mode_is_reference(get_irn_mode(a)) &&
326 mode_is_int(get_irn_mode(b)) ) {
329 if (mode_is_reference(get_irn_mode(n)) &&
330 mode_is_int(get_irn_mode(a)) &&
331 mode_is_reference(get_irn_mode(b)) ) {
337 if (get_irn_mode(n) != get_irn_mode(a)) {
338 VERBOSE_UNKNOWN_TYPE(("Mul %ld int1 * int1 = int2: unknown type\n", get_irn_node_nr(n)));
339 tp = firm_unknown_type; break;
345 b = get_Mux_false(n);
346 tp1 = compute_irn_type(a);
347 tp2 = compute_irn_type(b);
352 int i, n_conds = get_Psi_n_conds(n);
353 tp1 = compute_irn_type(get_Psi_default(n));
355 for (i = 0; i < n_conds; ++i) {
356 tp2 = compute_irn_type(get_Psi_val(n, i));
364 tp = compute_irn_type(get_Bound_index(n));
367 tp = compute_irn_type(get_Confirm_value(n));
370 /* Conv is a unop, but changing the mode implies
371 changing the type. */
378 /* It's not proper to walk past a Conv, so this case is handled above. */
388 if((tp1 == phi_cycle_type) || (tp2 == phi_cycle_type)) {
392 if (get_firm_verbosity() > 55) {
393 VERBOSE_UNKNOWN_TYPE(("Binop %ld with two different types: %s, %s: unknown type \n", get_irn_node_nr(n),
394 get_type_name(tp1), get_type_name(tp2)));
396 tp = firm_unknown_type;
400 panic(" not implemented: %+F", n);
401 } break; /* default */
407 /** Compute the type of an IR node. */
408 static ir_type *compute_irn_type(ir_node *n) {
409 ir_type *tp = get_irn_typeinfo_type(n);
411 if (tp == initial_type) {
412 tp = find_type_for_node(n);
413 set_irn_typeinfo_type(n, tp);
420 * Post-Walker: computes the type for every node
421 * and store it into a map.
422 * Post-walking ensures that the types for all predecessor
423 * nodes are already computed.
425 static void compute_type(ir_node *n, void *env) {
427 ir_type *tp = get_irn_typeinfo_type(n);
429 if (tp == phi_cycle_type) {
430 /* printf(" recomputing for phi_cycle_type "); DDMN(n); */
431 set_irn_typeinfo_type(n, initial_type);
437 * Compute the types for all nodes of a graph.
439 static void analyse_irg (ir_graph *irg) {
440 set_irg_typeinfo_state(irg, ir_typeinfo_consistent);
441 irg_walk_graph(irg, NULL, compute_type, NULL);
445 * Initialize the analysis by creating a phi_cycle_type and
446 * computing pointer types for all class and struct types.
448 static void init_irsimpletype(void) {
451 phi_cycle_type = new_type_class(new_id_from_str("phi_cycle_type"));
452 precompute_pointer_types();
455 /* Computes type information for each node in all ir graphs. */
456 void simple_analyse_types(void) {
459 for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
460 ir_graph *irg = get_irp_irg(i);
463 set_irp_typeinfo_state(ir_typeinfo_consistent);
466 void free_simple_type_information(void) {
469 if (phi_cycle_type) {
470 free_type(phi_cycle_type);
471 phi_cycle_type = NULL;
473 set_irp_typeinfo_state(ir_typeinfo_none);