updated cost model from gcc 4.3.0
[libfirm] / ir / be / bemain.c
1 /*
2  * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
3  *
4  * This file is part of libFirm.
5  *
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.
10  *
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.
14  *
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
17  * PURPOSE.
18  */
19
20 /**
21  * @file
22  * @brief       Main Backend driver.
23  * @author      Sebastian Hack
24  * @date        25.11.2004
25  * @version     $Id$
26  */
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include <stdarg.h>
32 #include <stdio.h>
33
34 #include "lc_opts.h"
35 #include "lc_opts_enum.h"
36
37 #include "obst.h"
38 #include "bitset.h"
39
40 #include "irprog.h"
41 #include "irgopt.h"
42 #include "irgraph.h"
43 #include "irdump.h"
44 #include "phiclass.h"
45 #include "irdom_t.h"
46 #include "iredges_t.h"
47 #include "irloop_t.h"
48 #include "irtools.h"
49 #include "irvrfy.h"
50 #include "irprintf.h"
51 #include "iroptimize.h"
52 #include "firmstat.h"
53 #include "execfreq.h"
54 #include "irprofile.h"
55
56 #include "bearch_t.h"
57 #include "be_t.h"
58 #include "bemodule.h"
59 #include "beutil.h"
60 #include "benode_t.h"
61 #include "beirgmod.h"
62 #include "besched_t.h"
63 #include "belistsched.h"
64 #include "belive_t.h"
65 #include "bera.h"
66 #include "bechordal_t.h"
67 #include "beifg.h"
68 #include "beifg_impl.h"
69 #include "becopyopt.h"
70 #include "becopystat.h"
71 #include "bessadestr.h"
72 #include "beabi.h"
73 #include "belower.h"
74 #include "beschedmris.h"
75 #include "bestat.h"
76 #include "beverify.h"
77 #include "be_dbgout.h"
78 #include "beirg_t.h"
79
80 #ifdef WITH_ILP
81 #include "beilpsched.h"
82 #endif /* WITH_ILP */
83
84 /* options visible for anyone */
85 static be_options_t be_options = {
86         DUMP_NONE,                         /* dump flags */
87         BE_TIME_OFF,                       /* no timing */
88         0,                                 /* no opt profile */
89         0,                                 /* try to omit frame pointer */
90         0,                                 /* create PIC code */
91         BE_VRFY_WARN,                      /* verification level: warn */
92         BE_SCHED_LIST,                     /* scheduler: list scheduler */
93         "linux",                           /* target OS name */
94         "i44pc52.info.uni-karlsruhe.de",   /* ilp server */
95         "cplex",                           /* ilp solver */
96         0,                                 /* enable statistic event dumping */
97         "",                                /* print stat events */
98 };
99
100 /* config file. */
101 static char config_file[256] = { 0 };
102
103 /* back end instruction set architecture to use */
104 static const arch_isa_if_t *isa_if = NULL;
105
106 /* possible dumping options */
107 static const lc_opt_enum_mask_items_t dump_items[] = {
108         { "none",       DUMP_NONE },
109         { "initial",    DUMP_INITIAL },
110         { "abi",        DUMP_ABI    },
111         { "sched",      DUMP_SCHED  },
112         { "prepared",   DUMP_PREPARED },
113         { "regalloc",   DUMP_RA },
114         { "final",      DUMP_FINAL },
115         { "be",         DUMP_BE },
116         { "all",        2 * DUMP_BE - 1 },
117         { NULL,         0 }
118 };
119
120 /* verify options. */
121 static const lc_opt_enum_int_items_t vrfy_items[] = {
122         { "off",    BE_VRFY_OFF    },
123         { "warn",   BE_VRFY_WARN   },
124         { "assert", BE_VRFY_ASSERT },
125         { NULL,     0 }
126 };
127
128 /* scheduling options. */
129 static const lc_opt_enum_int_items_t sched_items[] = {
130         { "list", BE_SCHED_LIST },
131 #ifdef WITH_ILP
132         { "ilp",  BE_SCHED_ILP  },
133 #endif /* WITH_ILP */
134         { NULL,   0 }
135 };
136
137 static lc_opt_enum_mask_var_t dump_var = {
138         &be_options.dump_flags, dump_items
139 };
140
141 static lc_opt_enum_int_var_t vrfy_var = {
142         &be_options.vrfy_option, vrfy_items
143 };
144
145 static lc_opt_enum_int_var_t sched_var = {
146         &be_options.scheduler, sched_items
147 };
148
149 static const lc_opt_table_entry_t be_main_options[] = {
150         LC_OPT_ENT_STR      ("config",   "read another config file containing backend options", config_file, sizeof(config_file)),
151         LC_OPT_ENT_ENUM_MASK("dump",     "dump irg on several occasions",                       &dump_var),
152         LC_OPT_ENT_BOOL     ("omitfp",   "omit frame pointer",                                  &be_options.omit_fp),
153         LC_OPT_ENT_BOOL     ("pic",      "create PIC code",                                     &be_options.pic),
154         LC_OPT_ENT_ENUM_PTR ("vrfy",     "verify the backend irg",                              &vrfy_var),
155         LC_OPT_ENT_BOOL     ("time",     "get backend timing statistics",                       &be_options.timing),
156         LC_OPT_ENT_BOOL     ("profile",  "instrument the code for execution count profiling",   &be_options.opt_profile),
157         LC_OPT_ENT_ENUM_PTR ("sched",    "select a scheduler",                                  &sched_var),
158         LC_OPT_ENT_STR      ("os",       "specify target operating system",                     &be_options.target_os, sizeof(be_options.target_os)),
159 #ifdef FIRM_STATISTICS
160         LC_OPT_ENT_BOOL     ("statev",   "dump statistic events",                               &be_options.statev),
161         LC_OPT_ENT_STR      ("filtev",   "filter for stat events (regex if support is active",  &be_options.printev, sizeof(be_options.printev)),
162 #endif
163
164 #ifdef WITH_ILP
165         LC_OPT_ENT_STR ("ilp.server", "the ilp server name", be_options.ilp_server, sizeof(be_options.ilp_server)),
166         LC_OPT_ENT_STR ("ilp.solver", "the ilp solver name", be_options.ilp_solver, sizeof(be_options.ilp_solver)),
167 #endif /* WITH_ILP */
168         LC_OPT_LAST
169 };
170
171 static be_module_list_entry_t *isa_ifs = NULL;
172
173 void be_register_isa_if(const char *name, const arch_isa_if_t *isa)
174 {
175         if(isa_if == NULL)
176                 isa_if = isa;
177
178         be_add_module_to_list(&isa_ifs, name, (void*) isa);
179 }
180
181 void be_opt_register(void)
182 {
183         lc_opt_entry_t *be_grp;
184         static int run_once = 0;
185
186         if (run_once) {
187                 return;
188         }
189         run_once     = 1;
190
191         be_init_modules();
192
193         be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
194         lc_opt_add_table(be_grp, be_main_options);
195
196         be_add_module_list_opt(be_grp, "isa", "the instruction set architecture",
197                                &isa_ifs, (void**) &isa_if);
198 }
199
200 /* Parse one argument. */
201 int be_parse_arg(const char *arg) {
202         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
203         if (strcmp(arg, "help") == 0 || (arg[0] == '?' && arg[1] == '\0')) {
204                 lc_opt_print_help(be_grp, stdout);
205                 return -1;
206         }
207         return lc_opt_from_single_arg(be_grp, NULL, arg, NULL);
208 }
209
210 /** The be parameters returned by default, all off. */
211 static const backend_params be_params = {
212         0,    /* need dword lowering */
213         0,    /* don't support inlien assembler yet */
214         NULL, /* no additional opcodes */
215         NULL, /* will be set later */
216         NULL, /* but yet no creator function */
217         NULL, /* context for create_intrinsic_fkt */
218         NULL, /* no if conversion settings */
219 };
220
221 /* Perform schedule verification if requested. */
222 static void be_sched_vrfy(be_irg_t *birg, int vrfy_opt) {
223         if (vrfy_opt == BE_VRFY_WARN) {
224                 be_verify_schedule(birg);
225         }
226         else if (vrfy_opt == BE_VRFY_ASSERT) {
227                 assert(be_verify_schedule(birg) && "Schedule verification failed.");
228         }
229 }
230
231 /* Initialize the Firm backend. Must be run BEFORE init_firm()! */
232 const backend_params *be_init(void)
233 {
234         be_opt_register();
235         be_init_modules();
236
237         if (isa_if->get_params)
238                 return isa_if->get_params();
239         return &be_params;
240 }
241
242 /**
243  * Initializes the main environment for the backend.
244  *
245  * @param env          an empty environment
246  * @param file_handle  the file handle where the output will be written to
247  */
248 static be_main_env_t *be_init_env(be_main_env_t *env, FILE *file_handle)
249 {
250         memset(env, 0, sizeof(*env));
251         obstack_init(&env->obst);
252         env->arch_env = obstack_alloc(&env->obst, sizeof(env->arch_env[0]));
253         env->options  = &be_options;
254         env->ent_trampoline_map = pmap_create();
255         env->pic_trampolines_type
256                 = new_type_class(new_id_from_str("$PIC_TRAMPOLINE_TYPE"));
257         env->ent_pic_symbol_map = pmap_create();
258         env->pic_symbols_type
259                 = new_type_struct(new_id_from_str("$PIC_SYMBOLS_TYPE"));
260
261         remove_irp_type(env->pic_trampolines_type);
262         remove_irp_type(env->pic_symbols_type);
263         set_class_final(env->pic_trampolines_type, 1);
264
265         arch_env_init(env->arch_env, isa_if, file_handle, env);
266
267         /* Register the irn handler of the architecture */
268         if (arch_isa_get_irn_handler(env->arch_env->isa))
269                 arch_env_push_irn_handler(env->arch_env, arch_isa_get_irn_handler(env->arch_env->isa));
270
271         /*
272          * Register the node handler of the back end infrastructure.
273          * This irn handler takes care of the platform independent
274          * spill, reload and perm nodes.
275          */
276         arch_env_push_irn_handler(env->arch_env, &be_node_irn_handler);
277         env->phi_handler = be_phi_handler_new(env->arch_env);
278         arch_env_push_irn_handler(env->arch_env, env->phi_handler);
279
280         be_dbg_open();
281         return env;
282 }
283
284 static void be_done_env(be_main_env_t *env)
285 {
286         env->arch_env->isa->impl->done(env->arch_env->isa);
287         be_dbg_close();
288         be_phi_handler_free(env->phi_handler);
289         obstack_free(&env->obst, NULL);
290
291         pmap_destroy(env->ent_trampoline_map);
292         pmap_destroy(env->ent_pic_symbol_map);
293         free_type(env->pic_trampolines_type);
294         free_type(env->pic_symbols_type);
295 }
296
297 /**
298  * A wrapper around a firm dumper. Dumps only, if
299  * flags are enabled.
300  *
301  * @param mask    a bitmask containing the reason what will be dumped
302  * @param irg     the IR graph to dump
303  * @param suffix  the suffix for the dumper
304  * @param dumper  the dumper to be called
305  */
306 static void dump(int mask, ir_graph *irg, const char *suffix,
307                  void (*dumper)(ir_graph *, const char *))
308 {
309         if(be_options.dump_flags & mask)
310                 be_dump(irg, suffix, dumper);
311 }
312
313 /**
314  * Prepare a backend graph for code generation and initialize its birg
315  */
316 static void initialize_birg(be_irg_t *birg, ir_graph *irg, be_main_env_t *env)
317 {
318         memset(birg, 0, sizeof(*birg));
319         birg->irg = irg;
320         birg->main_env = env;
321
322         edges_deactivate_kind(irg, EDGE_KIND_DEP);
323         edges_activate_kind(irg, EDGE_KIND_DEP);
324
325         dump(DUMP_INITIAL, irg, "-begin", dump_ir_block_graph);
326
327         be_stat_init_irg(env->arch_env, irg);
328         be_do_stat_nodes(irg, "01 Begin");
329
330         /* set the current graph (this is important for several firm functions) */
331         current_ir_graph = irg;
332
333         /* Normalize proj nodes. */
334         normalize_proj_nodes(irg);
335
336         /* we do this before critical edge split. As this produces less returns,
337            because sometimes (= 164.gzip) multiple returns are slower */
338         normalize_n_returns(irg);
339
340         /* Remove critical edges */
341         remove_critical_cf_edges(irg);
342
343         /* Ensure, that the ir_edges are computed. */
344         edges_assure(irg);
345
346         set_irg_phase_state(irg, phase_backend);
347
348         dump(DUMP_INITIAL, irg, "-prepared", dump_ir_block_graph);
349 }
350
351 #define BE_TIMER_ONLY(code)   do { if (be_timing) { code; } } while(0)
352
353 int be_timing;
354 ir_timer_t *t_abi;
355 ir_timer_t *t_codegen;
356 ir_timer_t *t_sched;
357 ir_timer_t *t_constr;
358 ir_timer_t *t_finish;
359 ir_timer_t *t_emit;
360 ir_timer_t *t_other;
361 ir_timer_t *t_verify;
362 ir_timer_t *t_heights;
363 ir_timer_t *t_live;
364 ir_timer_t *t_execfreq;
365 ir_timer_t *t_ssa_constr;
366 ir_timer_t *t_ra_constr;
367 ir_timer_t *t_ra_prolog;
368 ir_timer_t *t_ra_epilog;
369 ir_timer_t *t_ra_spill;
370 ir_timer_t *t_ra_spill_apply;
371 ir_timer_t *t_ra_color;
372 ir_timer_t *t_ra_ifg;
373 ir_timer_t *t_ra_copymin;
374 ir_timer_t *t_ra_ssa;
375 ir_timer_t *t_ra_other;
376
377 /**
378  * The Firm backend main loop.
379  * Do architecture specific lowering for all graphs
380  * and call the architecture specific code generator.
381  *
382  * @param file_handle   the file handle the output will be written to
383  * @param cup_name      name of the compilation unit
384  */
385 static void be_main_loop(FILE *file_handle, const char *cup_name)
386 {
387         int i;
388         arch_isa_t *isa;
389         be_main_env_t env;
390         char prof_filename[256];
391         static const char suffix[] = ".prof";
392         be_irg_t *birgs;
393         int num_birgs;
394         ir_graph **irg_list, **backend_irg_list;
395
396         be_timing = (be_options.timing == BE_TIME_ON);
397
398         if (be_timing) {
399                 t_abi        = ir_timer_register("time_beabi",    "be abi introduction");
400                 t_codegen    = ir_timer_register("time_codegen",     "codegeneration");
401                 t_sched      = ir_timer_register("time_sched",       "scheduling");
402                 t_constr     = ir_timer_register("time_constr",   "assure constraints");
403                 t_finish     = ir_timer_register("time_finish",      "graph finish");
404                 t_emit       = ir_timer_register("time_emiter",      "code emiter");
405                 t_verify     = ir_timer_register("time_verify",   "graph verification");
406                 t_other      = ir_timer_register("time_other",       "other");
407                 t_heights    = ir_timer_register("time_heights",     "heights");
408                 t_live       = ir_timer_register("time_liveness",    "be liveness");
409                 t_execfreq   = ir_timer_register("time_execfreq",    "execfreq");
410                 t_ssa_constr = ir_timer_register("time_ssa_constr",  "ssa reconstruction");
411                 t_ra_prolog  = ir_timer_register("time_ra_prolog",   "regalloc prolog");
412                 t_ra_epilog  = ir_timer_register("time_ra_epilog",   "regalloc epilog");
413                 t_ra_constr  = ir_timer_register("time_ra_constr",   "regalloc constraints");
414                 t_ra_spill   = ir_timer_register("time_ra_spill",    "spiller");
415                 t_ra_spill_apply
416                         = ir_timer_register("time_ra_spill_apply", "apply spills");
417                 t_ra_color   = ir_timer_register("time_ra_color",    "graph coloring");
418                 t_ra_ifg     = ir_timer_register("time_ra_ifg",      "interference graph");
419                 t_ra_copymin = ir_timer_register("time_ra_copymin",  "copy minimization");
420                 t_ra_ssa     = ir_timer_register("time_ra_ssadestr", "ssa destruction");
421                 t_ra_other   = ir_timer_register("time_ra_other",    "regalloc other");
422         }
423
424         be_init_env(&env, file_handle);
425         env.cup_name = cup_name;
426
427         isa = arch_env_get_isa(env.arch_env);
428
429         be_dbg_so(cup_name);
430         be_dbg_types();
431
432         /* backend may provide an ordered list of irgs where code should be generated for */
433         irg_list         = NEW_ARR_F(ir_graph *, 0);
434         backend_irg_list = arch_isa_get_backend_irg_list(isa, &irg_list);
435
436         /* we might need 1 birg more for instrumentation constructor */
437         num_birgs = backend_irg_list ? ARR_LEN(backend_irg_list) : get_irp_n_irgs();
438         birgs     = alloca(sizeof(birgs[0]) * (num_birgs + 1));
439
440         /* First: initialize all birgs */
441         for(i = 0; i < num_birgs; ++i) {
442                 ir_graph *irg = backend_irg_list ? backend_irg_list[i] : get_irp_irg(i);
443                 initialize_birg(&birgs[i], irg, &env);
444         }
445         DEL_ARR_F(irg_list);
446
447         /*
448                 Get the filename for the profiling data.
449                 Beware: '\0' is already included in sizeof(suffix)
450         */
451         memset(prof_filename, 0, sizeof(prof_filename));
452         strncpy(prof_filename, cup_name, sizeof(prof_filename) - sizeof(suffix));
453         strcat(prof_filename, suffix);
454
455         /*
456                 Next: Either instruments all irgs with profiling code
457                 or try to read in profile data for current translation unit.
458         */
459         if (be_options.opt_profile) {
460                 ir_graph *prof_init_irg = ir_profile_instrument(prof_filename, profile_default);
461                 initialize_birg(&birgs[num_birgs], prof_init_irg, &env);
462                 num_birgs++;
463         } else {
464                 ir_profile_read(prof_filename);
465         }
466
467         /* For all graphs */
468         for (i = 0; i < num_birgs; ++i) {
469                 be_irg_t *birg = &birgs[i];
470                 ir_graph *irg  = birg->irg;
471                 optimization_state_t state;
472                 const arch_code_generator_if_t *cg_if;
473
474                 /* set the current graph (this is important for several firm functions) */
475                 current_ir_graph = irg;
476
477                 be_sched_init_phase(irg);
478
479                 /* reset the phi handler. */
480                 be_phi_handler_reset(env.phi_handler);
481
482                 stat_ev_ctx_push_fobj("bemain_irg", irg);
483
484                 /* stop and reset timers */
485                 BE_TIMER_PUSH(t_other);   /* t_other */
486
487                 /* Verify the initial graph */
488                 BE_TIMER_PUSH(t_verify);
489                 if (be_options.vrfy_option == BE_VRFY_WARN) {
490                         irg_verify(irg, VRFY_ENFORCE_SSA);
491                         be_check_dominance(irg);
492                 } else if (be_options.vrfy_option == BE_VRFY_ASSERT) {
493                         assert(irg_verify(irg, VRFY_ENFORCE_SSA) && "irg verification failed");
494                         assert(be_check_dominance(irg) && "Dominance verification failed");
495                 }
496                 BE_TIMER_POP(t_verify);
497
498                 /* Get the code generator interface. */
499                 cg_if = isa->impl->get_code_generator_if(isa);
500
501                 /* get a code generator for this graph. */
502                 birg->cg = cg_if->init(birg);
503
504                 /* some transformations need to be done before abi introduce */
505                 arch_code_generator_before_abi(birg->cg);
506
507                 /* implement the ABI conventions. */
508                 BE_TIMER_PUSH(t_abi);
509                 birg->abi = be_abi_introduce(birg);
510                 BE_TIMER_POP(t_abi);
511
512                 dump(DUMP_ABI, irg, "-abi", dump_ir_block_graph);
513                 be_do_stat_nodes(irg, "02 Abi");
514
515                 if (be_options.vrfy_option == BE_VRFY_WARN) {
516                         be_check_dominance(irg);
517                         be_verify_out_edges(irg);
518                 } else if (be_options.vrfy_option == BE_VRFY_ASSERT) {
519                         assert(be_verify_out_edges(irg));
520                         assert(be_check_dominance(irg) && "Dominance verification failed");
521                 }
522
523                 /* generate code */
524                 stat_ev_ctx_push_str("bemain_phase", "prepare");
525                 BE_TIMER_PUSH(t_codegen);
526                 arch_code_generator_prepare_graph(birg->cg);
527                 BE_TIMER_POP(t_codegen);
528                 stat_ev_ctx_pop("bemain_phase");
529
530                 /* reset the phi handler. */
531                 be_phi_handler_reset(env.phi_handler);
532
533                 be_do_stat_nodes(irg, "03 Prepare");
534
535                 dump(DUMP_PREPARED, irg, "-prepared", dump_ir_block_graph);
536
537                 if (be_options.vrfy_option == BE_VRFY_WARN) {
538                         be_check_dominance(irg);
539                         be_verify_out_edges(irg);
540                 } else if (be_options.vrfy_option == BE_VRFY_ASSERT) {
541                         assert(be_verify_out_edges(irg));
542                         assert(be_check_dominance(irg) && "Dominance verification failed");
543                 }
544
545                 BE_TIMER_PUSH(t_execfreq);
546                 /**
547                  * Create execution frequencies from profile data or estimate some
548                  */
549                 if (ir_profile_has_data())
550                         birg->exec_freq = ir_create_execfreqs_from_profile(irg);
551                 else
552                         birg->exec_freq = compute_execfreq(irg, 10);
553                 BE_TIMER_POP(t_execfreq);
554
555
556                 /* disabled for now, fails for EmptyFor.c and XXEndless.c */
557                 /* be_live_chk_compare(birg); */
558
559                 /* let backend prepare scheduling */
560                 stat_ev_ctx_push_str("bemain_phase", "before_sched");
561                 BE_TIMER_PUSH(t_codegen);
562                 arch_code_generator_before_sched(birg->cg);
563                 BE_TIMER_POP(t_codegen);
564                 stat_ev_ctx_pop("bemain_phase");
565
566                 /* schedule the irg */
567                 BE_TIMER_PUSH(t_sched);
568                 switch (be_options.scheduler) {
569                         default:
570                                 fprintf(stderr, "Warning: invalid scheduler (%d) selected, falling back to list scheduler.\n", be_options.scheduler);
571                         case BE_SCHED_LIST:
572                                 list_sched(birg, &be_options);
573                                 break;
574 #ifdef WITH_ILP
575                         case BE_SCHED_ILP:
576                                 be_ilp_sched(birg, &be_options);
577                                 break;
578 #endif /* WITH_ILP */
579                 };
580                 BE_TIMER_POP(t_sched);
581
582                 dump(DUMP_SCHED, irg, "-sched", dump_ir_block_graph_sched);
583
584                 /* check schedule */
585                 BE_TIMER_PUSH(t_verify);
586                 be_sched_vrfy(birg, be_options.vrfy_option);
587                 BE_TIMER_POP(t_verify);
588
589                 be_do_stat_nodes(irg, "04 Schedule");
590
591                 /* introduce patterns to assure constraints */
592                 BE_TIMER_PUSH(t_constr);
593                 /* we switch off optimizations here, because they might cause trouble */
594                 save_optimization_state(&state);
595                 set_optimize(0);
596                 set_opt_normalize(0);
597                 set_opt_cse(0);
598
599                 assert(!get_opt_cse());
600
601                 /* add Keeps for should_be_different constrained nodes  */
602                 /* beware: needs schedule due to usage of be_ssa_constr */
603                 assure_constraints(birg);
604                 BE_TIMER_POP(t_constr);
605
606                 dump(DUMP_SCHED, irg, "-assured", dump_ir_block_graph_sched);
607                 be_do_stat_nodes(irg, "05 Constraints");
608
609                 /* stuff needs to be done after scheduling but before register allocation */
610                 BE_TIMER_PUSH(t_codegen);
611                 arch_code_generator_before_ra(birg->cg);
612                 BE_TIMER_POP(t_codegen);
613
614                 /* connect all stack modifying nodes together (see beabi.c) */
615                 BE_TIMER_PUSH(t_abi);
616                 be_abi_fix_stack_nodes(birg->abi);
617                 BE_TIMER_POP(t_abi);
618
619                 dump(DUMP_SCHED, irg, "-fix_stack", dump_ir_block_graph_sched);
620
621                 /* check schedule */
622                 BE_TIMER_PUSH(t_verify);
623                 be_sched_vrfy(birg, be_options.vrfy_option);
624                 BE_TIMER_POP(t_verify);
625
626                 /* do some statistics */
627                 //be_do_stat_reg_pressure(birg);
628
629 #ifdef FIRM_STATISTICS
630                 stat_ev_dbl("costs_before_ra", be_estimate_irg_costs(irg, env.arch_env, birg->exec_freq));
631 #endif
632
633                 /* Do register allocation */
634                 be_allocate_registers(birg);
635
636 #ifdef FIRM_STATISTICS
637                 stat_ev_dbl("costs_before_ra", be_estimate_irg_costs(irg, env.arch_env, birg->exec_freq));
638 #endif
639
640                 dump(DUMP_RA, irg, "-ra", dump_ir_block_graph_sched);
641                 be_do_stat_nodes(irg, "06 Register Allocation");
642
643                 /* let the code generator prepare the graph for emitter */
644                 BE_TIMER_PUSH(t_finish);
645                 arch_code_generator_after_ra(birg->cg);
646                 BE_TIMER_POP(t_finish);
647
648                 /* fix stack offsets */
649                 BE_TIMER_PUSH(t_abi);
650                 be_abi_fix_stack_nodes(birg->abi);
651                 be_remove_dead_nodes_from_schedule(birg);
652                 be_abi_fix_stack_bias(birg->abi);
653                 BE_TIMER_POP(t_abi);
654
655                 dump(DUMP_SCHED, irg, "-fix_stack_after_ra", dump_ir_block_graph_sched);
656
657                 BE_TIMER_PUSH(t_finish);
658                 arch_code_generator_finish(birg->cg);
659                 BE_TIMER_POP(t_finish);
660
661                 dump(DUMP_FINAL, irg, "-finish", dump_ir_block_graph_sched);
662
663                 /* check schedule and register allocation */
664                 BE_TIMER_PUSH(t_verify);
665                 if (be_options.vrfy_option == BE_VRFY_WARN) {
666                         irg_verify(irg, VRFY_ENFORCE_SSA);
667                         be_check_dominance(irg);
668                         be_verify_out_edges(irg);
669                         be_verify_schedule(birg);
670                         be_verify_register_allocation(birg);
671                 } else if (be_options.vrfy_option == BE_VRFY_ASSERT) {
672                         assert(irg_verify(irg, VRFY_ENFORCE_SSA) && "irg verification failed");
673                         assert(be_verify_out_edges(irg) && "out edge verification failed");
674                         assert(be_check_dominance(irg) && "Dominance verification failed");
675                         assert(be_verify_schedule(birg) && "Schedule verification failed");
676                         assert(be_verify_register_allocation(birg)
677                                && "register allocation verification failed");
678
679                 }
680                 BE_TIMER_POP(t_verify);
681
682                 /* emit assembler code */
683                 BE_TIMER_PUSH(t_emit);
684                 arch_code_generator_done(birg->cg);
685                 BE_TIMER_POP(t_emit);
686
687                 dump(DUMP_FINAL, irg, "-end", dump_ir_block_graph_sched);
688
689                 BE_TIMER_PUSH(t_abi);
690                 be_abi_free(birg->abi);
691                 BE_TIMER_POP(t_abi);
692
693                 be_do_stat_nodes(irg, "07 Final");
694                 restore_optimization_state(&state);
695
696                 BE_TIMER_POP(t_other);
697
698 #define STOP_AND_RESET_TIMER(timer) do { ir_timer_stop(timer); ir_timer_reset(timer); } while(0)
699
700 #define LC_EMIT(timer)  \
701                 stat_ev_if {    \
702                         stat_ev_dbl(ir_timer_get_name(timer), ir_timer_elapsed_msec(timer));  \
703                 } else { \
704                         printf("%-20s: %8.3lf msec\n", ir_timer_get_description(timer), (double)ir_timer_elapsed_usec(timer) / 1000.0); \
705                 } \
706                 STOP_AND_RESET_TIMER(timer);
707
708                 BE_TIMER_ONLY(
709                         stat_ev_if {
710                         } else {
711                                 printf("==>> IRG %s <<==\n", get_entity_name(get_irg_entity(irg)));
712                         }
713                         LC_EMIT(t_abi);
714                         LC_EMIT(t_codegen);
715                         LC_EMIT(t_sched);
716                         LC_EMIT(t_live);
717                         LC_EMIT(t_heights);
718                         LC_EMIT(t_ssa_constr);
719                         LC_EMIT(t_constr);
720                         LC_EMIT(t_execfreq);
721                         LC_EMIT(t_ra_prolog);
722                         LC_EMIT(t_ra_spill);
723                         LC_EMIT(t_ra_spill_apply);
724                         LC_EMIT(t_ra_constr);
725                         LC_EMIT(t_ra_color);
726                         LC_EMIT(t_ra_ifg);
727                         LC_EMIT(t_ra_copymin);
728                         LC_EMIT(t_ra_ssa);
729                         LC_EMIT(t_ra_epilog);
730                         LC_EMIT(t_ra_other);
731                         LC_EMIT(t_finish);
732                         LC_EMIT(t_emit);
733                         LC_EMIT(t_verify);
734                         LC_EMIT(t_other);
735                 );
736 #undef LC_EMIT
737
738                 be_sched_free_phase(irg);
739
740                 be_free_birg(birg);
741
742         /* switched off due to statistics (statistic module needs all irgs) */
743 #if 0   /* STA needs irgs */
744 #ifdef FIRM_STATISTICS
745                 if (! stat_is_active())
746 #endif /* FIRM_STATISTICS */
747                         free_ir_graph(irg);
748 #endif /* if 0 */
749                 stat_ev_ctx_pop("bemain_irg");
750         }
751         ir_profile_free();
752         be_done_env(&env);
753 }
754
755 /* Main interface to the frontend. */
756 void be_main(FILE *file_handle, const char *cup_name)
757 {
758         ir_timer_t *t = NULL;
759
760         /* The user specified another config file to read. do that now. */
761         if(strlen(config_file) > 0) {
762                 FILE *f;
763
764                 if((f = fopen(config_file, "rt")) != NULL) {
765                         lc_opt_from_file(config_file, f, NULL);
766                         fclose(f);
767                 }
768         }
769
770         if (be_options.timing == BE_TIME_ON) {
771                 t = ir_timer_register("bemain", "measure complete bemain loop");
772
773                 if (ir_timer_enter_high_priority()) {
774                         fprintf(stderr, "Warning: Could not enter high priority mode.\n");
775                 }
776
777                 ir_timer_reset_and_start(t);
778         }
779
780 #ifdef FIRM_STATISTICS
781         if (be_options.statev) {
782                 const char *dot = strrchr(cup_name, '.');
783                 const char *pos = dot ? dot : cup_name + strlen(cup_name);
784                 char       *buf = alloca(pos - cup_name + 1);
785                 strncpy(buf, cup_name, pos - cup_name);
786                 buf[pos - cup_name] = '\0';
787
788                 be_options.statev = 1;
789                 stat_ev_begin(buf, be_options.printev);
790         }
791 #endif
792
793         /* never build code for pseudo irgs */
794         set_visit_pseudo_irgs(0);
795
796         be_node_init();
797
798         be_main_loop(file_handle, cup_name);
799
800         if (be_options.timing == BE_TIME_ON) {
801                 ir_timer_stop(t);
802                 ir_timer_leave_high_priority();
803                 stat_ev_if {
804                         stat_ev_dbl("backend_time", ir_timer_elapsed_msec(t));
805                 } else {
806                         printf("%-20s: %lu msec\n", "BEMAINLOOP", ir_timer_elapsed_msec(t));
807                 }
808         }
809
810 #ifdef FIRM_STATISTICS
811         if (be_options.statev)
812                 stat_ev_end();
813 #endif
814 }
815
816 unsigned be_put_ignore_regs(const be_irg_t *birg, const arch_register_class_t *cls, bitset_t *bs)
817 {
818         if (bs == NULL)
819                 bs = bitset_alloca(cls->n_regs);
820         else
821                 bitset_clear_all(bs);
822
823         assert(bitset_size(bs) == (unsigned)cls->n_regs);
824         arch_put_non_ignore_regs(birg->main_env->arch_env, cls, bs);
825         bitset_flip_all(bs);
826         be_abi_put_ignore_regs(birg->abi, cls, bs);
827
828         return bitset_popcnt(bs);
829 }