nsz Git - libfirm/blob - 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 #include "config.h"
  28
  29 #include <stdarg.h>
  30 #include <stdio.h>
  31
  32 #include "lc_opts.h"
  33 #include "lc_opts_enum.h"
  34
  35 #include "obst.h"
  36 #include "bitset.h"
  37
  38 #include "irprog.h"
  39 #include "irgopt.h"
  40 #include "irgraph.h"
  41 #include "irdump.h"
  42 #include "irdom_t.h"
  43 #include "iredges_t.h"
  44 #include "irloop_t.h"
  45 #include "irtools.h"
  46 #include "irverify.h"
  47 #include "irprintf.h"
  48 #include "iroptimize.h"
  49 #include "firmstat.h"
  50 #include "execfreq.h"
  51 #include "irprofile.h"
  52 #include "irpass_t.h"
  53
  54 #include "bearch.h"
  55 #include "be_t.h"
  56 #include "bemodule.h"
  57 #include "beutil.h"
  58 #include "benode.h"
  59 #include "beirgmod.h"
  60 #include "besched.h"
  61 #include "belistsched.h"
  62 #include "belive_t.h"
  63 #include "bera.h"
  64 #include "bechordal_t.h"
  65 #include "beifg.h"
  66 #include "becopyopt.h"
  67 #include "becopystat.h"
  68 #include "bessadestr.h"
  69 #include "beabi.h"
  70 #include "belower.h"
  71 #include "beschedmris.h"
  72 #include "bestat.h"
  73 #include "beverify.h"
  74 #include "be_dbgout.h"
  75 #include "beirg.h"
  76 #include "bestack.h"
  77
  78 #define NEW_ID(s) new_id_from_chars(s, sizeof(s) - 1)
  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,                                 /* try to omit leaf frame pointer */
  91         0,                                 /* create PIC code */
  92         0,                                 /* create gprof compatible profiling code */
  93         BE_VERIFY_WARN,                    /* verification level: warn */
  94         BE_SCHED_LIST,                     /* scheduler: list scheduler */
  95         "linux",                           /* target OS name */
  96         "i44pc52.info.uni-karlsruhe.de",   /* ilp server */
  97         "cplex",                           /* ilp solver */
  98         0,                                 /* enable statistic event dumping */
  99         "",                                /* print stat events */
 100 };
 101
 102 /* config file. */
 103 static char config_file[256] = { 0 };
 104
 105 /* back end instruction set architecture to use */
 106 static const arch_isa_if_t *isa_if = NULL;
 107
 108 /* possible dumping options */
 109 static const lc_opt_enum_mask_items_t dump_items[] = {
 110         { "none",       DUMP_NONE },
 111         { "initial",    DUMP_INITIAL },
 112         { "abi",        DUMP_ABI    },
 113         { "sched",      DUMP_SCHED  },
 114         { "prepared",   DUMP_PREPARED },
 115         { "regalloc",   DUMP_RA },
 116         { "final",      DUMP_FINAL },
 117         { "be",         DUMP_BE },
 118         { "all",        2 * DUMP_BE - 1 },
 119         { NULL,         0 }
 120 };
 121
 122 /* verify options. */
 123 static const lc_opt_enum_int_items_t verify_items[] = {
 124         { "off",    BE_VERIFY_OFF    },
 125         { "warn",   BE_VERIFY_WARN   },
 126         { "assert", BE_VERIFY_ASSERT },
 127         { NULL,     0 }
 128 };
 129
 130 /* scheduling options. */
 131 static const lc_opt_enum_int_items_t sched_items[] = {
 132         { "list", BE_SCHED_LIST },
 133 #ifdef WITH_ILP
 134         { "ilp",  BE_SCHED_ILP  },
 135 #endif /* WITH_ILP */
 136         { NULL,   0 }
 137 };
 138
 139 static lc_opt_enum_mask_var_t dump_var = {
 140         &be_options.dump_flags, dump_items
 141 };
 142
 143 static lc_opt_enum_int_var_t verify_var = {
 144         &be_options.verify_option, verify_items
 145 };
 146
 147 static lc_opt_enum_int_var_t sched_var = {
 148         &be_options.scheduler, sched_items
 149 };
 150
 151 static const lc_opt_table_entry_t be_main_options[] = {
 152         LC_OPT_ENT_STR      ("config",     "read another config file containing backend options", config_file, sizeof(config_file)),
 153         LC_OPT_ENT_ENUM_MASK("dump",       "dump irg on several occasions",                       &dump_var),
 154         LC_OPT_ENT_BOOL     ("omitfp",     "omit frame pointer",                                  &be_options.omit_fp),
 155         LC_OPT_ENT_BOOL     ("omitleaffp", "omit frame pointer in leaf routines",                 &be_options.omit_leaf_fp),
 156         LC_OPT_ENT_BOOL     ("pic",        "create PIC code",                                     &be_options.pic),
 157         LC_OPT_ENT_BOOL     ("gprof",      "create gprof profiling code",                         &be_options.gprof),
 158         LC_OPT_ENT_ENUM_PTR ("verify",     "verify the backend irg",                              &verify_var),
 159         LC_OPT_ENT_BOOL     ("time",       "get backend timing statistics",                       &be_options.timing),
 160         LC_OPT_ENT_BOOL     ("profile",    "instrument the code for execution count profiling",   &be_options.opt_profile),
 161         LC_OPT_ENT_ENUM_PTR ("sched",      "select a scheduler",                                  &sched_var),
 162         LC_OPT_ENT_STR      ("os",         "specify target operating system",                     &be_options.target_os, sizeof(be_options.target_os)),
 163 #ifdef FIRM_STATISTICS
 164         LC_OPT_ENT_BOOL     ("statev",     "dump statistic events",                               &be_options.statev),
 165         LC_OPT_ENT_STR      ("filtev",     "filter for stat events (regex if support is active",  &be_options.filtev, sizeof(be_options.filtev)),
 166 #endif
 167
 168 #ifdef WITH_ILP
 169         LC_OPT_ENT_STR ("ilp.server", "the ilp server name", be_options.ilp_server, sizeof(be_options.ilp_server)),
 170         LC_OPT_ENT_STR ("ilp.solver", "the ilp solver name", be_options.ilp_solver, sizeof(be_options.ilp_solver)),
 171 #endif /* WITH_ILP */
 172         LC_OPT_LAST
 173 };
 174
 175 static be_module_list_entry_t *isa_ifs = NULL;
 176
 177
 178 unsigned short asm_constraint_flags[256];
 179
 180 void be_init_default_asm_constraint_flags(void)
 181 {
 182         asm_constraint_flags['?'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 183         asm_constraint_flags['!'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 184         asm_constraint_flags['&'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT
 185                 | ASM_CONSTRAINT_FLAG_MODIFIER_EARLYCLOBBER;
 186         asm_constraint_flags['%'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT
 187                 | ASM_CONSTRAINT_FLAG_MODIFIER_COMMUTATIVE;
 188         asm_constraint_flags['!'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 189
 190         asm_constraint_flags['='] = ASM_CONSTRAINT_FLAG_MODIFIER_WRITE
 191                 | ASM_CONSTRAINT_FLAG_MODIFIER_NO_READ;
 192         asm_constraint_flags['+'] = ASM_CONSTRAINT_FLAG_MODIFIER_READ
 193                 | ASM_CONSTRAINT_FLAG_MODIFIER_WRITE;
 194
 195         asm_constraint_flags['i'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 196         asm_constraint_flags['s'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 197         asm_constraint_flags['E'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 198         asm_constraint_flags['F'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 199         asm_constraint_flags['G'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 200         asm_constraint_flags['H'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 201         asm_constraint_flags['I'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 202         asm_constraint_flags['J'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 203         asm_constraint_flags['K'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 204         asm_constraint_flags['L'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 205         asm_constraint_flags['M'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 206         asm_constraint_flags['N'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 207         asm_constraint_flags['O'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 208         asm_constraint_flags['P'] = ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 209
 210         asm_constraint_flags['m'] = ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP;
 211         asm_constraint_flags['o'] = ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP;
 212         asm_constraint_flags['V'] = ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP;
 213         asm_constraint_flags['<'] = ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP;
 214         asm_constraint_flags['>'] = ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP;
 215
 216         asm_constraint_flags['p'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 217         asm_constraint_flags['0'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 218         asm_constraint_flags['1'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 219         asm_constraint_flags['2'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 220         asm_constraint_flags['3'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 221         asm_constraint_flags['4'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 222         asm_constraint_flags['5'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 223         asm_constraint_flags['6'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 224         asm_constraint_flags['7'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 225         asm_constraint_flags['8'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 226         asm_constraint_flags['9'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER;
 227
 228         asm_constraint_flags['X'] = ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER
 229                 | ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP
 230                 | ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE;
 231
 232         /* these should have been catched by the parsing code already */
 233         asm_constraint_flags['#']  = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 234         asm_constraint_flags['*']  = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 235         asm_constraint_flags[' ']  = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 236         asm_constraint_flags['\t'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 237         asm_constraint_flags['\n'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 238         asm_constraint_flags['\r'] = ASM_CONSTRAINT_FLAG_NO_SUPPORT;
 239 }
 240
 241 asm_constraint_flags_t be_parse_asm_constraints(const char *constraint)
 242 {
 243         asm_constraint_flags_t  flags = 0;
 244         const char             *c;
 245         asm_constraint_flags_t  tflags;
 246
 247         for (c = constraint; *c != '\0'; ++c) {
 248                 switch (*c) {
 249                 case '#':
 250                         /* 'comment' stuff */
 251                         while (*c != 0 && *c != ',')
 252                                 ++c;
 253                         break;
 254                 case '*':
 255                         /* 'comment' character */
 256                         ++c;
 257                         break;
 258                 case ' ':
 259                 case '\t':
 260                 case '\n':
 261                 case '\r':
 262                         break;
 263                 default:
 264                         tflags = asm_constraint_flags[(int) *c];
 265                         if (tflags != 0) {
 266                                 flags |= tflags;
 267                         } else {
 268                                 flags |= isa_if->parse_asm_constraint(&c);
 269                         }
 270                         break;
 271                 }
 272         }
 273
 274         if ((
 275                 flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE &&
 276                 flags & ASM_CONSTRAINT_FLAG_MODIFIER_NO_WRITE
 277             ) || (
 278                 flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ &&
 279                 flags & ASM_CONSTRAINT_FLAG_MODIFIER_NO_READ
 280             )) {
 281                 flags |= ASM_CONSTRAINT_FLAG_INVALID;
 282         }
 283         if (!(flags & (ASM_CONSTRAINT_FLAG_MODIFIER_READ     |
 284                        ASM_CONSTRAINT_FLAG_MODIFIER_WRITE    |
 285                        ASM_CONSTRAINT_FLAG_MODIFIER_NO_WRITE |
 286                        ASM_CONSTRAINT_FLAG_MODIFIER_NO_READ)
 287             )) {
 288                 flags |= ASM_CONSTRAINT_FLAG_MODIFIER_READ;
 289         }
 290
 291         return flags;
 292 }
 293
 294 int be_is_valid_clobber(const char *clobber)
 295 {
 296         /* memory is a valid clobber. (the frontend has to detect this case too,
 297          * because it has to add memory edges to the asm) */
 298         if (strcmp(clobber, "memory") == 0)
 299                 return 1;
 300         /* cc (condition code) is always valid */
 301         if (strcmp(clobber, "cc") == 0)
 302                 return 1;
 303
 304         return isa_if->is_valid_clobber(clobber);
 305 }
 306
 307 void be_register_isa_if(const char *name, const arch_isa_if_t *isa)
 308 {
 309         if (isa_if == NULL)
 310                 isa_if = isa;
 311
 312         be_add_module_to_list(&isa_ifs, name, (void*) isa);
 313 }
 314
 315 void be_opt_register(void)
 316 {
 317         lc_opt_entry_t *be_grp;
 318         static int run_once = 0;
 319
 320         if (run_once)
 321                 return;
 322         run_once = 1;
 323
 324         be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
 325         lc_opt_add_table(be_grp, be_main_options);
 326
 327         be_add_module_list_opt(be_grp, "isa", "the instruction set architecture",
 328                                &isa_ifs, (void**) &isa_if);
 329
 330         be_init_modules();
 331 }
 332
 333 /* Parse one argument. */
 334 int be_parse_arg(const char *arg)
 335 {
 336         lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
 337         if (strcmp(arg, "help") == 0 || (arg[0] == '?' && arg[1] == '\0')) {
 338                 lc_opt_print_help_for_entry(be_grp, '-', stdout);
 339                 return -1;
 340         }
 341         return lc_opt_from_single_arg(be_grp, NULL, arg, NULL);
 342 }
 343
 344 /* Perform schedule verification if requested. */
 345 static void be_sched_verify(ir_graph *irg, int verify_opt)
 346 {
 347         if (verify_opt == BE_VERIFY_WARN) {
 348                 be_verify_schedule(irg);
 349         } else if (verify_opt == BE_VERIFY_ASSERT) {
 350                 assert(be_verify_schedule(irg) && "Schedule verification failed.");
 351         }
 352 }
 353
 354 /* Initialize the Firm backend. Must be run first in init_firm()! */
 355 void firm_be_init(void)
 356 {
 357         be_opt_register();
 358         be_init_modules();
 359 }
 360
 361 /* Finalize the Firm backend. */
 362 void firm_be_finish(void)
 363 {
 364         be_quit_modules();
 365 }
 366
 367 /* Returns the backend parameter */
 368 const backend_params *be_get_backend_param(void)
 369 {
 370         return isa_if->get_params();
 371 }
 372
 373 /**
 374  * Initializes the main environment for the backend.
 375  *
 376  * @param env          an empty environment
 377  * @param file_handle  the file handle where the output will be written to
 378  */
 379 static be_main_env_t *be_init_env(be_main_env_t *env, FILE *file_handle)
 380 {
 381         memset(env, 0, sizeof(*env));
 382         env->options              = &be_options;
 383         env->ent_trampoline_map   = pmap_create();
 384         env->pic_trampolines_type = new_type_class(NEW_ID("$PIC_TRAMPOLINE_TYPE"));
 385         env->ent_pic_symbol_map   = pmap_create();
 386         env->pic_symbols_type     = new_type_struct(NEW_ID("$PIC_SYMBOLS_TYPE"));
 387
 388         remove_irp_type(env->pic_trampolines_type);
 389         remove_irp_type(env->pic_symbols_type);
 390         set_class_final(env->pic_trampolines_type, 1);
 391
 392         memset(asm_constraint_flags, 0, sizeof(asm_constraint_flags));
 393         env->arch_env = arch_env_init(isa_if, file_handle, env);
 394
 395         be_dbg_open();
 396         return env;
 397 }
 398
 399 /**
 400  * Called when the be_main_env_t can be destroyed.
 401  */
 402 static void be_done_env(be_main_env_t *env)
 403 {
 404         arch_env_done(env->arch_env);
 405         be_dbg_close();
 406
 407         pmap_destroy(env->ent_trampoline_map);
 408         pmap_destroy(env->ent_pic_symbol_map);
 409         free_type(env->pic_trampolines_type);
 410         free_type(env->pic_symbols_type);
 411 }
 412
 413 /**
 414  * A wrapper around a firm dumper. Dumps only, if
 415  * flags are enabled.
 416  *
 417  * @param mask    a bitmask containing the reason what will be dumped
 418  * @param irg     the IR graph to dump
 419  * @param suffix  the suffix for the dumper
 420  * @param dumper  the dumper to be called
 421  */
 422 static void dump(int mask, ir_graph *irg, const char *suffix)
 423 {
 424         if (be_options.dump_flags & mask)
 425                 dump_ir_graph(irg, suffix);
 426 }
 427
 428 /**
 429  * Prepare a backend graph for code generation and initialize its irg
 430  */
 431 static void initialize_birg(be_irg_t *birg, ir_graph *irg, be_main_env_t *env)
 432 {
 433         /* don't duplicate locals in backend when dumping... */
 434         ir_remove_dump_flags(ir_dump_flag_consts_local);
 435
 436         dump(DUMP_INITIAL, irg, "begin");
 437
 438         irg->be_data = birg;
 439
 440         memset(birg, 0, sizeof(*birg));
 441         birg->irg = irg;
 442         birg->main_env = env;
 443         obstack_init(&birg->obst);
 444
 445         edges_deactivate_kind(irg, EDGE_KIND_DEP);
 446         edges_activate_kind(irg, EDGE_KIND_DEP);
 447
 448         /* set the current graph (this is important for several firm functions) */
 449         current_ir_graph = irg;
 450
 451         /* we do this before critical edge split. As this produces less returns,
 452            because sometimes (= 164.gzip) multiple returns are slower */
 453         normalize_n_returns(irg);
 454
 455         /* Remove critical edges */
 456         remove_critical_cf_edges_ex(irg, /*ignore_exception_edges=*/0);
 457
 458         /* Ensure, that the ir_edges are computed. */
 459         edges_assure(irg);
 460
 461         set_irg_phase_state(irg, phase_backend);
 462         be_info_init_irg(irg);
 463
 464         dump(DUMP_INITIAL, irg, "prepared");
 465 }
 466
 467 #define BE_TIMER_ONLY(code)   do { if (be_timing) { code; } } while (0)
 468
 469 int be_timing;
 470
 471 static const char *get_timer_name(be_timer_id_t id)
 472 {
 473         switch (id) {
 474         case T_ABI:            return "abi";
 475         case T_CODEGEN:        return "codegen";
 476         case T_RA_PREPARATION: return "ra_preparation";
 477         case T_SCHED:          return "sched";
 478         case T_CONSTR:         return "constr";
 479         case T_FINISH:         return "finish";
 480         case T_EMIT:           return "emit";
 481         case T_VERIFY:         return "verify";
 482         case T_OTHER:          return "other";
 483         case T_HEIGHTS:        return "heights";
 484         case T_LIVE:           return "live";
 485         case T_EXECFREQ:       return "execfreq";
 486         case T_SSA_CONSTR:     return "ssa_constr";
 487         case T_RA_PROLOG:      return "ra_prolog";
 488         case T_RA_EPILOG:      return "ra_epilog";
 489         case T_RA_CONSTR:      return "ra_constr";
 490         case T_RA_SPILL:       return "ra_spill";
 491         case T_RA_SPILL_APPLY: return "ra_spill_apply";
 492         case T_RA_COLOR:       return "ra_color";
 493         case T_RA_IFG:         return "ra_ifg";
 494         case T_RA_COPYMIN:     return "ra_copymin";
 495         case T_RA_SSA:         return "ra_ssa";
 496         case T_RA_OTHER:       return "ra_other";
 497         }
 498         return "unknown";
 499 }
 500 ir_timer_t *be_timers[T_LAST+1];
 501
 502 /**
 503  * The Firm backend main loop.
 504  * Do architecture specific lowering for all graphs
 505  * and call the architecture specific code generator.
 506  *
 507  * @param file_handle   the file handle the output will be written to
 508  * @param cup_name      name of the compilation unit
 509  */
 510 static void be_main_loop(FILE *file_handle, const char *cup_name)
 511 {
 512         static const char suffix[] = ".prof";
 513
 514         int           i, num_birgs, stat_active = 0;
 515         be_main_env_t env;
 516         char          prof_filename[256];
 517         be_irg_t      *birgs;
 518         ir_graph      **irg_list, **backend_irg_list;
 519         arch_env_t    *arch_env;
 520
 521         be_timing = (be_options.timing == BE_TIME_ON);
 522
 523         if (be_timing) {
 524                 for (i = 0; i < T_LAST+1; ++i) {
 525                         be_timers[i] = ir_timer_new();
 526                 }
 527         }
 528
 529         be_init_env(&env, file_handle);
 530         env.cup_name = cup_name;
 531
 532         be_dbg_so(cup_name);
 533         be_dbg_types();
 534
 535         arch_env = env.arch_env;
 536
 537         /* backend may provide an ordered list of irgs where code should be
 538          * generated for */
 539         irg_list         = NEW_ARR_F(ir_graph *, 0);
 540         backend_irg_list = arch_env_get_backend_irg_list(arch_env, &irg_list);
 541
 542         /* we might need 1 birg more for instrumentation constructor */
 543         num_birgs = backend_irg_list ? ARR_LEN(backend_irg_list) : get_irp_n_irgs();
 544         birgs     = ALLOCAN(be_irg_t, num_birgs + 1);
 545
 546         be_info_init();
 547
 548         /* First: initialize all birgs */
 549         for (i = 0; i < num_birgs; ++i) {
 550                 ir_graph *irg = backend_irg_list ? backend_irg_list[i] : get_irp_irg(i);
 551                 initialize_birg(&birgs[i], irg, &env);
 552         }
 553         arch_env_handle_intrinsics(arch_env);
 554         DEL_ARR_F(irg_list);
 555
 556         /*
 557                 Get the filename for the profiling data.
 558                 Beware: '\0' is already included in sizeof(suffix)
 559         */
 560         memset(prof_filename, 0, sizeof(prof_filename));
 561         strncpy(prof_filename, cup_name, sizeof(prof_filename) - sizeof(suffix));
 562         strcat(prof_filename, suffix);
 563
 564         /*
 565                 Next: Either instruments all irgs with profiling code
 566                 or try to read in profile data for current translation unit.
 567         */
 568         if (be_options.opt_profile) {
 569                 ir_graph *prof_init_irg = ir_profile_instrument(prof_filename, profile_default);
 570                 initialize_birg(&birgs[num_birgs], prof_init_irg, &env);
 571                 num_birgs++;
 572         } else {
 573                 ir_profile_read(prof_filename);
 574         }
 575
 576 #ifdef FIRM_STATISTICS
 577         stat_active = stat_is_active();
 578 #endif /* FIRM_STATISTICS */
 579
 580         /* For all graphs */
 581         for (i = 0; i < num_birgs; ++i) {
 582                 be_irg_t *birg = &birgs[i];
 583                 ir_graph *irg  = birg->irg;
 584                 optimization_state_t state;
 585                 const arch_code_generator_if_t *cg_if;
 586
 587                 /* set the current graph (this is important for several firm functions) */
 588                 current_ir_graph = irg;
 589
 590                 stat_ev_if {
 591                         stat_ev_ctx_push_fobj("bemain_irg", irg);
 592                         be_stat_ev("bemain_insns_start", be_count_insns(irg));
 593                         be_stat_ev("bemain_blocks_start", be_count_blocks(irg));
 594                 }
 595
 596                 /* stop and reset timers */
 597                 be_timer_push(T_OTHER);
 598
 599                 /* Verify the initial graph */
 600                 be_timer_push(T_VERIFY);
 601                 if (be_options.verify_option == BE_VERIFY_WARN) {
 602                         irg_verify(irg, VERIFY_ENFORCE_SSA);
 603                         be_check_dominance(irg);
 604                 } else if (be_options.verify_option == BE_VERIFY_ASSERT) {
 605                         assert(irg_verify(irg, VERIFY_ENFORCE_SSA) && "irg verification failed");
 606                         assert(be_check_dominance(irg) && "Dominance verification failed");
 607                 }
 608                 be_timer_pop(T_VERIFY);
 609
 610                 /* Get the code generator interface. */
 611                 cg_if = arch_env_get_code_generator_if(arch_env);
 612
 613                 /* get a code generator for this graph. */
 614                 birg->cg = cg_if->init(irg);
 615
 616                 /* some transformations need to be done before abi introduce */
 617                 assert(birg->cg->impl->before_abi == NULL || !arch_env->custom_abi);
 618                 arch_code_generator_before_abi(birg->cg);
 619
 620                 /* implement the ABI conventions. */
 621                 be_timer_push(T_ABI);
 622                 be_abi_introduce(irg);
 623                 be_timer_pop(T_ABI);
 624
 625                 if (!arch_env->custom_abi) {
 626                         dump(DUMP_ABI, irg, "abi");
 627                 }
 628
 629                 /* we have to do cfopt+remove_critical_edges as we can't have Bad-blocks
 630                  * or critical edges in the backend */
 631                 optimize_cf(irg);
 632                 remove_critical_cf_edges(irg);
 633
 634                 /* We often have dead code reachable through out-edges here. So for
 635                  * now we rebuild edges (as we need correct user count for code
 636                  * selection) */
 637                 edges_deactivate(irg);
 638                 edges_activate(irg);
 639
 640                 dump(DUMP_PREPARED, irg, "before-code-selection");
 641
 642                 if (be_options.verify_option == BE_VERIFY_WARN) {
 643                         be_check_dominance(irg);
 644                 } else if (be_options.verify_option == BE_VERIFY_ASSERT) {
 645                         assert(be_check_dominance(irg) && "Dominance verification failed");
 646                 }
 647
 648                 /* perform codeselection */
 649                 be_timer_push(T_CODEGEN);
 650                 arch_code_generator_prepare_graph(birg->cg);
 651                 be_timer_pop(T_CODEGEN);
 652
 653                 if (be_options.verify_option == BE_VERIFY_WARN) {
 654                         be_check_dominance(irg);
 655                 } else if (be_options.verify_option == BE_VERIFY_ASSERT) {
 656                         assert(be_check_dominance(irg) && "Dominance verification failed");
 657                 }
 658
 659                 be_timer_push(T_EXECFREQ);
 660                 /**
 661                  * Create execution frequencies from profile data or estimate some
 662                  */
 663                 if (ir_profile_has_data())
 664                         birg->exec_freq = ir_create_execfreqs_from_profile(irg);
 665                 else {
 666                         /* TODO: edges are corrupt for EDGE_KIND_BLOCK after the local
 667                          * optimize graph phase merges blocks in the x86 backend */
 668                         edges_deactivate(irg);
 669                         birg->exec_freq = compute_execfreq(irg, 10);
 670                 }
 671                 be_timer_pop(T_EXECFREQ);
 672
 673
 674                 /* disabled for now, fails for EmptyFor.c and XXEndless.c */
 675                 /* be_live_chk_compare(irg); */
 676
 677                 /* schedule the irg */
 678                 be_timer_push(T_SCHED);
 679                 switch (be_options.scheduler) {
 680                         default:
 681                                 fprintf(stderr, "Warning: invalid scheduler (%d) selected, falling back to list scheduler.\n", be_options.scheduler);
 682                         case BE_SCHED_LIST:
 683                                 list_sched(irg);
 684                                 break;
 685 #ifdef WITH_ILP
 686                         case BE_SCHED_ILP:
 687                                 be_ilp_sched(irg);
 688                                 break;
 689 #endif /* WITH_ILP */
 690                 };
 691                 be_timer_pop(T_SCHED);
 692
 693                 dump(DUMP_SCHED, irg, "sched");
 694
 695                 /* check schedule */
 696                 be_timer_push(T_VERIFY);
 697                 be_sched_verify(irg, be_options.verify_option);
 698                 be_timer_pop(T_VERIFY);
 699
 700                 /* introduce patterns to assure constraints */
 701                 be_timer_push(T_CONSTR);
 702                 /* we switch off optimizations here, because they might cause trouble */
 703                 save_optimization_state(&state);
 704                 set_optimize(0);
 705                 set_opt_normalize(0);
 706                 set_opt_cse(0);
 707
 708                 /* add Keeps for should_be_different constrained nodes  */
 709                 /* beware: needs schedule due to usage of be_ssa_constr */
 710                 assure_constraints(irg);
 711                 be_timer_pop(T_CONSTR);
 712
 713                 dump(DUMP_SCHED, irg, "assured");
 714
 715                 /* stuff needs to be done after scheduling but before register allocation */
 716                 be_timer_push(T_RA_PREPARATION);
 717                 arch_code_generator_before_ra(birg->cg);
 718                 be_timer_pop(T_RA_PREPARATION);
 719
 720                 /* connect all stack modifying nodes together (see beabi.c) */
 721                 be_timer_push(T_ABI);
 722                 be_abi_fix_stack_nodes(irg);
 723                 be_timer_pop(T_ABI);
 724
 725                 dump(DUMP_SCHED, irg, "fix_stack");
 726
 727                 /* check schedule */
 728                 be_timer_push(T_VERIFY);
 729                 be_sched_verify(irg, be_options.verify_option);
 730                 be_timer_pop(T_VERIFY);
 731
 732                 stat_ev_if {
 733                         stat_ev_dbl("bemain_costs_before_ra",
 734                                         be_estimate_irg_costs(irg, birg->exec_freq));
 735                         be_stat_ev("bemain_insns_before_ra", be_count_insns(irg));
 736                         be_stat_ev("bemain_blocks_before_ra", be_count_blocks(irg));
 737                 }
 738
 739                 /* Do register allocation */
 740                 be_allocate_registers(irg);
 741
 742 #ifdef FIRM_STATISTICS
 743                 stat_ev_dbl("bemain_costs_before_ra", be_estimate_irg_costs(irg, birg->exec_freq));
 744 #endif
 745
 746                 dump(DUMP_RA, irg, "ra");
 747
 748                 /* let the code generator prepare the graph for emitter */
 749                 be_timer_push(T_FINISH);
 750                 arch_code_generator_after_ra(birg->cg);
 751                 be_timer_pop(T_FINISH);
 752
 753                 /* fix stack offsets */
 754                 be_timer_push(T_ABI);
 755                 be_abi_fix_stack_nodes(irg);
 756                 be_remove_dead_nodes_from_schedule(irg);
 757                 be_abi_fix_stack_bias(irg);
 758                 be_timer_pop(T_ABI);
 759
 760                 dump(DUMP_SCHED, irg, "fix_stack_after_ra");
 761
 762                 be_timer_push(T_FINISH);
 763                 arch_code_generator_finish(birg->cg);
 764                 be_timer_pop(T_FINISH);
 765
 766                 dump(DUMP_FINAL, irg, "finish");
 767
 768                 stat_ev_if {
 769                         be_stat_ev("bemain_insns_finish", be_count_insns(irg));
 770                         be_stat_ev("bemain_blocks_finish", be_count_blocks(irg));
 771                 }
 772
 773                 /* check schedule and register allocation */
 774                 be_timer_push(T_VERIFY);
 775                 if (be_options.verify_option == BE_VERIFY_WARN) {
 776                         irg_verify(irg, VERIFY_ENFORCE_SSA);
 777                         be_check_dominance(irg);
 778                         be_verify_schedule(irg);
 779                         be_verify_register_allocation(irg);
 780                 } else if (be_options.verify_option == BE_VERIFY_ASSERT) {
 781                         assert(irg_verify(irg, VERIFY_ENFORCE_SSA) && "irg verification failed");
 782                         assert(be_check_dominance(irg) && "Dominance verification failed");
 783                         assert(be_verify_schedule(irg) && "Schedule verification failed");
 784                         assert(be_verify_register_allocation(irg)
 785                                && "register allocation verification failed");
 786
 787                 }
 788                 be_timer_pop(T_VERIFY);
 789
 790                 /* emit assembler code */
 791                 be_timer_push(T_EMIT);
 792                 arch_code_generator_done(birg->cg);
 793                 be_timer_pop(T_EMIT);
 794
 795                 dump(DUMP_FINAL, irg, "end");
 796
 797                 be_timer_push(T_ABI);
 798                 be_abi_free(irg);
 799                 be_timer_pop(T_ABI);
 800
 801                 restore_optimization_state(&state);
 802
 803                 be_timer_pop(T_OTHER);
 804
 805                 if (be_timing) {
 806                         int t;
 807                         if (stat_ev_enabled) {
 808                                 for (t = 0; t < T_LAST+1; ++t) {
 809                                         char buf[128];
 810                                         snprintf(buf, sizeof(buf), "bemain_time_%s",
 811                                                  get_timer_name(t));
 812                                         stat_ev_dbl(buf, ir_timer_elapsed_usec(be_timers[i]));
 813                                 }
 814                         } else {
 815                                 printf("==>> IRG %s <<==\n",
 816                                        get_entity_name(get_irg_entity(irg)));
 817                                 for (t = 0; t < T_LAST+1; ++t) {
 818                                         double val = ir_timer_elapsed_usec(be_timers[t]) / 1000.0;
 819                                         printf("%-20s: %8.3lf msec\n", get_timer_name(t), val);
 820                                 }
 821                         }
 822                         for (t = 0; t < T_LAST+1; ++t) {
 823                                 ir_timer_stop(be_timers[t]);
 824                                 ir_timer_reset(be_timers[t]);
 825                         }
 826                 }
 827
 828                 be_free_birg(irg);
 829                 stat_ev_ctx_pop("bemain_irg");
 830         }
 831         ir_profile_free();
 832         be_done_env(&env);
 833
 834         be_info_free();
 835 }
 836
 837 /* Main interface to the frontend. */
 838 void be_main(FILE *file_handle, const char *cup_name)
 839 {
 840         ir_timer_t *t = NULL;
 841
 842         /* The user specified another config file to read. do that now. */
 843         if (config_file[0] != '\0') {
 844                 FILE *f = fopen(config_file, "rt");
 845
 846                 if (f != NULL) {
 847                         lc_opt_from_file(config_file, f, NULL);
 848                         fclose(f);
 849                 } else {
 850                         fprintf(stderr, "Warning: Cannot open config file '%s'\n", config_file);
 851                 }
 852         }
 853
 854         if (be_options.timing == BE_TIME_ON) {
 855                 t = ir_timer_new();
 856
 857                 if (ir_timer_enter_high_priority()) {
 858                         fprintf(stderr, "Warning: Could not enter high priority mode.\n");
 859                 }
 860
 861                 ir_timer_reset_and_start(t);
 862         }
 863
 864 #ifdef FIRM_STATISTICS
 865         if (be_options.statev) {
 866                 const char *dot = strrchr(cup_name, '.');
 867                 const char *pos = dot ? dot : cup_name + strlen(cup_name);
 868                 char       *buf = ALLOCAN(char, pos - cup_name + 1);
 869                 strncpy(buf, cup_name, pos - cup_name);
 870                 buf[pos - cup_name] = '\0';
 871
 872                 be_options.statev = 1;
 873                 stat_ev_begin(buf, be_options.filtev);
 874                 stat_ev_ctx_push_str("bemain_compilation_unit", cup_name);
 875         }
 876 #endif
 877
 878         be_main_loop(file_handle, cup_name);
 879
 880         if (be_options.timing == BE_TIME_ON) {
 881                 ir_timer_stop(t);
 882                 ir_timer_leave_high_priority();
 883                 stat_ev_if {
 884                         stat_ev_dbl("bemain_backend_time", ir_timer_elapsed_msec(t));
 885                 } else {
 886                         double val = ir_timer_elapsed_usec(t) / 1000.0;
 887                         printf("%-20s: %8.3lf msec\n", "BEMAINLOOP", val);
 888                 }
 889         }
 890
 891 #ifdef FIRM_STATISTICS
 892         if (be_options.statev) {
 893                 stat_ev_ctx_pop("bemain_compilation_unit");
 894                 stat_ev_end();
 895         }
 896 #endif
 897 }
 898
 899 static int do_lower_for_target(ir_prog *irp, void *context)
 900 {
 901         const backend_params *be_params = be_get_backend_param();
 902         be_params->lower_for_target();
 903         (void) context;
 904         (void) irp;
 905         return 0;
 906 }
 907
 908 ir_prog_pass_t *lower_for_target_pass(const char *name)
 909 {
 910         ir_prog_pass_t *pass = XMALLOCZ(ir_prog_pass_t);
 911         return def_prog_pass_constructor(pass,
 912                                          name ? name : "lower_for_target",
 913                                          do_lower_for_target);
 914 }
 915
 916 unsigned be_put_ignore_regs(const ir_graph *irg,
 917                             const arch_register_class_t *cls, bitset_t *bs)
 918 {
 919         if (bs == NULL)
 920                 bs = bitset_alloca(cls->n_regs);
 921         else
 922                 bitset_clear_all(bs);
 923
 924         assert(bitset_size(bs) == cls->n_regs);
 925         arch_put_non_ignore_regs(cls, bs);
 926         bitset_flip_all(bs);
 927         be_abi_put_ignore_regs(be_get_irg_abi(irg), cls, bs);
 928
 929         return bitset_popcount(bs);
 930 }