nsz Git - libfirm/blob - ir/be/beprofile.c

   1 /*
   2  * Copyright (C) 1995-2007 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 /** vim: set sw=4 ts=4:
  21  * @file   beprofile.c
  22  * @date   2006-04-06
  23  * @author Adam M. Szalkowski
  24  * @cvs-id $Id$
  25  *
  26  * Code instrumentation and execution count profiling
  27  *
  28  * Copyright (C) 2006 Universitaet Karlsruhe
  29  * Released under the GPL
  30  */
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include <math.h>
  36
  37 #include "hashptr.h"
  38 #include "debug.h"
  39 #include "obst.h"
  40 #include "set.h"
  41 #include "list.h"
  42 #include "pmap.h"
  43
  44 #include "entity.h"
  45 #include "irprintf.h"
  46 #include "irgwalk.h"
  47 #include "irdump_t.h"
  48 #include "irnode_t.h"
  49 #include "ircons_t.h"
  50 #include "irloop_t.h"
  51 #include "iredges.h"
  52 #include "execfreq.h"
  53 #include "irvrfy.h"
  54 #include "type.h"
  55
  56 #include "be_t.h"
  57 #include "belive_t.h"
  58 #include "besched_t.h"
  59 #include "beirgmod.h"
  60 #include "bearch_t.h"
  61 #include "beabi.h"
  62 #include "benode_t.h"
  63 #include "beutil.h"
  64 #include "ircons.h"
  65 #include "irhooks.h"
  66 #include "iredges.h"
  67
  68 #include "bechordal_t.h"
  69
  70 #include "beprofile.h"
  71
  72 /** An entry in the id-to-location map */
  73 typedef struct loc_entry {
  74         ir_entity    *fname;   /**< the entity holding the file name */
  75         unsigned int lineno;   /**< line number */
  76 } loc_entry;
  77
  78 typedef struct _block_id_walker_data_t {
  79         tarval         **array;    /**< the entity the holds the block counts */
  80         unsigned int   id;         /**< current block id number */
  81         ir_node        *symconst;  /**< the SymConst representing array */
  82         pmap           *fname_map; /**< set containing all found filenames */
  83         loc_entry      *locs;      /**< locations */
  84         ir_type        *tp_char;   /**< the character type */
  85         unsigned       flags;      /**< profile flags */
  86 } block_id_walker_data_t;
  87
  88 typedef struct _execcount_t {
  89         unsigned int block;
  90         unsigned int count;
  91 } execcount_t;
  92
  93 static int
  94 cmp_execcount(const void * a, const void * b, size_t size)
  95 {
  96         return ((execcount_t*)a)->block != ((execcount_t*)b)->block;
  97 }
  98
  99 static void
 100 block_counter(ir_node * bb, void * data)
 101 {
 102         unsigned int  *count = data;
 103         *count = *count + 1;
 104 }
 105
 106 static unsigned int
 107 count_blocks(ir_graph * irg)
 108 {
 109         unsigned int count = 0;
 110
 111         irg_block_walk_graph(irg, block_counter, NULL, &count);
 112         return count;
 113 }
 114
 115 /* keep the execcounts here because they are only read once per compiler run */
 116 static set * profile = NULL;
 117 static hook_entry_t hook;
 118
 119 /**
 120  * Instrument a block with code needed for profiling
 121  */
 122 static void
 123 instrument_block(ir_node * bb, ir_node * address, unsigned int id)
 124 {
 125         ir_graph *irg = get_irn_irg(bb);
 126         ir_node  *start_block = get_irg_start_block(irg);
 127         ir_node  *load, *store, *offset, *add, *projm, *proji, *unknown;
 128         ir_node  *cnst;
 129
 130         /**
 131          * We can't instrument the start and end block as there are no real
 132          * instructions in these blocks
 133          */
 134         if(bb == start_block || bb == get_irg_end_block(irg))
 135                 return;
 136
 137         unknown = new_r_Unknown(irg, mode_M);
 138         cnst    = new_r_Const_long(irg, start_block, mode_Iu, get_mode_size_bytes(mode_Iu) * id);
 139         offset  = new_r_Add(irg, bb, address, cnst, mode_P);
 140         load    = new_r_Load(irg, bb, unknown, offset, mode_Iu);
 141         projm   = new_r_Proj(irg, bb, load, mode_M, pn_Load_M);
 142         proji   = new_r_Proj(irg, bb, load, mode_Iu, pn_Load_res);
 143         cnst    = new_r_Const_long(irg, start_block, mode_Iu, 1);
 144         add     = new_r_Add(irg, bb, proji, cnst, mode_Iu);
 145         store   = new_r_Store(irg, bb, projm, offset, add);
 146         projm   = new_r_Proj(irg, bb, store, mode_M, pn_Store_M);
 147         set_irn_link(bb, projm);
 148         set_irn_link(projm, load);
 149 }
 150
 151 typedef struct fix_env {
 152         ir_node *start_block;
 153         ir_node *end_block;
 154 } fix_env;
 155
 156 /**
 157  * SSA Construction for instrumentation code memory
 158  */
 159 static void
 160 fix_ssa(ir_node * bb, void * data)
 161 {
 162         fix_env *env = data;
 163         ir_node *mem;
 164         int     arity = get_Block_n_cfgpreds(bb);
 165
 166         /* start and end block are not instrumented, skip! */
 167         if (bb == env->start_block || bb == env->end_block)
 168                 return;
 169
 170         if (arity == 1) {
 171                 mem = get_irn_link(get_Block_cfgpred_block(bb, 0));
 172         } else {
 173                 int n;
 174                 ir_node **ins;
 175                 ir_graph *irg = current_ir_graph;
 176
 177                 NEW_ARR_A(ir_node*, ins, arity);
 178                 for (n = arity - 1; n >= 0; --n) {
 179                         ins[n] = get_irn_link(get_Block_cfgpred_block(bb, n));
 180                 }
 181                 mem = new_r_Phi(irg, bb, arity, ins, mode_M);
 182         }
 183         set_Load_mem(get_irn_link(get_irn_link(bb)), mem);
 184 }
 185
 186
 187 /**
 188  * Generates a new irg which calls the initializer
 189  *
 190  * Pseudocode:
 191  *       void __firmprof_initializer(void) { __init_firmprof(ent_filename, bblock_id, bblock_counts, n_blocks); }
 192  */
 193 static ir_graph *
 194 gen_initializer_irg(ir_entity * ent_filename, ir_entity * bblock_id, ir_entity * bblock_counts, int n_blocks)
 195 {
 196         ir_node *start_block;
 197
 198         ir_node   *ins[4];
 199         ident     *name = new_id_from_str("__firmprof_initializer");
 200         ir_entity *ent  = new_entity(get_glob_type(), name, new_type_method(name, 0, 0));
 201         ir_node   *ret, *call, *symconst;
 202         symconst_symbol sym;
 203
 204         ident     *init_name = new_id_from_str("__init_firmprof");
 205         ir_type   *init_type = new_type_method(init_name, 4, 0);
 206         ir_type   *uint, *uintptr, *string;
 207         ir_entity *init_ent;
 208         ir_graph  *irg;
 209         ir_node   *bb;
 210         ir_type   *empty_frame_type;
 211
 212         set_entity_ld_ident(ent, name);
 213
 214         uint    = new_type_primitive(new_id_from_str("__uint"), mode_Iu);
 215         uintptr = new_type_pointer(new_id_from_str("__uintptr"), uint, mode_P);
 216         string  = new_type_pointer(new_id_from_str("__charptr"), new_type_primitive(new_id_from_str("__char"), mode_Bs), mode_P);
 217
 218         set_method_param_type(init_type, 0, string);
 219         set_method_param_type(init_type, 1, uintptr);
 220         set_method_param_type(init_type, 2, uintptr);
 221         set_method_param_type(init_type, 3, uint);
 222         init_ent = new_entity(get_glob_type(), init_name, init_type);
 223         set_entity_ld_ident(init_ent, init_name);
 224
 225         irg = new_ir_graph(ent, 0);
 226         empty_frame_type = get_irg_frame_type(irg);
 227         set_type_size_bytes(empty_frame_type, 0);
 228
 229         bb = get_cur_block();
 230
 231         start_block = get_irg_start_block(irg);
 232
 233         sym.entity_p = init_ent;
 234         symconst     = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 235
 236         sym.entity_p = ent_filename;
 237         ins[0] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 238         sym.entity_p = bblock_id;
 239         ins[1] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 240         sym.entity_p = bblock_counts;
 241         ins[2] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 242         ins[3] = new_r_Const_long(irg, start_block, mode_Iu, n_blocks);
 243
 244         call = new_r_Call(irg, bb, get_irg_initial_mem(irg), symconst, 4, ins, init_type);
 245         ret = new_r_Return(irg, bb, new_r_Proj(irg, bb, call, mode_M, pn_Call_M_regular), 0, NULL);
 246         mature_immBlock(bb);
 247
 248         add_immBlock_pred(get_irg_end_block(irg), ret);
 249         mature_immBlock(get_irg_end_block(irg));
 250
 251         irg_finalize_cons(irg);
 252
 253         return irg;
 254 }
 255
 256 /**
 257  * Create the location data for the given debug info.
 258  */
 259 static void create_location_data(dbg_info *dbg, block_id_walker_data_t *wd)
 260 {
 261         unsigned lineno;
 262         const char *fname = be_retrieve_dbg_info(dbg, &lineno);
 263
 264         if (fname) {
 265                 pmap_entry *entry = pmap_find(wd->fname_map, (void *)fname);
 266                 ir_entity  *ent;
 267
 268                 if (! entry) {
 269                         static unsigned nr = 0;
 270                         ident   *id;
 271                         char    buf[128];
 272                         ir_type *arr;
 273                         int     i, len = strlen(fname) + 1;
 274                         tarval  **tarval_string;
 275
 276                         snprintf(buf, sizeof(buf), "firm_name_arr.%d", nr);
 277                         arr = new_type_array(new_id_from_str(buf), 1, wd->tp_char);
 278                         set_array_bounds_int(arr, 0, 0, len);
 279
 280                         snprintf(buf, sizeof(buf), "__firm_name.%d", nr++);
 281                         id = new_id_from_str(buf);
 282                         ent = new_entity(get_glob_type(), id, arr);
 283                         set_entity_ld_ident(ent, id);
 284
 285                         pmap_insert(wd->fname_map, (void *)fname, ent);
 286
 287                         /* initialize file name string constant */
 288                         tarval_string = alloca(sizeof(*tarval_string) * (len));
 289                         for (i = 0; i < len; ++i) {
 290                                 tarval_string[i] = new_tarval_from_long(fname[i], mode_Bs);
 291                         }
 292                         set_entity_variability(ent, variability_constant);
 293                         set_array_entity_values(ent, tarval_string, len);
 294                 } else {
 295                         ent = entry->value;
 296                 }
 297                 wd->locs[wd->id].fname  = ent;
 298                 wd->locs[wd->id].lineno = lineno;
 299         } else {
 300                 wd->locs[wd->id].fname  = NULL;
 301                 wd->locs[wd->id].lineno = 0;
 302         }
 303 }
 304
 305 /**
 306  * Walker: assigns an ID to every block.
 307  * Builds the string table
 308  */
 309 static void
 310 block_id_walker(ir_node * bb, void * data)
 311 {
 312         block_id_walker_data_t *wd = data;
 313
 314         wd->array[wd->id] = new_tarval_from_long(get_irn_node_nr(bb), mode_Iu);
 315         instrument_block(bb, wd->symconst, wd->id);
 316
 317         if (wd->flags & profile_with_locations) {
 318                 dbg_info *dbg = get_irn_dbg_info(bb);
 319                 create_location_data(dbg, wd);
 320         }
 321         ++wd->id;
 322 }
 323
 324 #define IDENT(x)        new_id_from_chars(x, sizeof(x) - 1)
 325
 326 ir_graph *
 327 be_profile_instrument(const char *filename, unsigned flags)
 328 {
 329         int n, i;
 330         int n_blocks = 0;
 331         ir_entity *bblock_id;
 332         ir_entity *bblock_counts;
 333         ir_entity *ent_filename;
 334         ir_entity *ent_locations = NULL;
 335         ir_entity *loc_lineno = NULL;
 336         ir_entity *loc_name = NULL;
 337         ir_entity *ent;
 338         ir_type *array_type;
 339         ir_type *uint_type;
 340         ir_type *string_type;
 341         ir_type *character_type;
 342         ir_type *loc_type = NULL;
 343         ir_type *charptr_type;
 344         ir_type *gtp;
 345         tarval **tarval_array;
 346         tarval **tarval_string;
 347         tarval *tv;
 348         int filename_len = strlen(filename)+1;
 349         ident *cur_ident;
 350         int align_l, align_n, size;
 351         ir_graph *rem;
 352         block_id_walker_data_t  wd;
 353         symconst_symbol sym;
 354
 355         /* count the number of block first */
 356         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 357                 ir_graph *irg = get_irp_irg(n);
 358
 359                 n_blocks += count_blocks(irg);
 360         }
 361
 362         /* create all the necessary types and entities. Note that the
 363            types must have a fixed layout, because we already running in the
 364            backend */
 365         uint_type      = new_type_primitive(IDENT("__uint"), mode_Iu);
 366         set_type_alignment_bytes(uint_type, get_type_size_bytes(uint_type));
 367         array_type     = new_type_array(IDENT("__block_info_array"), 1, uint_type);
 368         set_array_bounds_int(array_type, 0, 0, n_blocks);
 369
 370         character_type = new_type_primitive(IDENT("__char"), mode_Bs);
 371         string_type    = new_type_array(IDENT("__filename"), 1, character_type);
 372         set_array_bounds_int(string_type, 0, 0, filename_len);
 373
 374         gtp            = get_glob_type();
 375
 376         cur_ident      = IDENT("__FIRMPROF__BLOCK_IDS");
 377         bblock_id      = new_entity(gtp, cur_ident, array_type);
 378         set_entity_ld_ident(bblock_id, cur_ident);
 379         set_entity_variability(bblock_id, variability_initialized);
 380
 381         cur_ident      = IDENT("__FIRMPROF__BLOCK_COUNTS");
 382         bblock_counts  = new_entity(gtp, cur_ident, array_type);
 383         set_entity_ld_ident(bblock_counts, cur_ident);
 384         set_entity_variability(bblock_counts, variability_initialized);
 385
 386         cur_ident      = IDENT("__FIRMPROF__FILE_NAME");
 387         ent_filename   = new_entity(gtp, cur_ident, string_type);
 388         set_entity_ld_ident(ent_filename, cur_ident);
 389
 390         if (flags & profile_with_locations) {
 391                 loc_type       = new_type_struct(IDENT("__location"));
 392                 loc_lineno     = new_entity(loc_type, IDENT("lineno"), uint_type);
 393                 align_l        = get_type_alignment_bytes(uint_type);
 394                 size           = get_type_size_bytes(uint_type);
 395                 set_entity_offset(loc_lineno, 0);
 396
 397                 charptr_type   = new_type_pointer(IDENT("__charptr"), character_type, mode_P_data);
 398                 align_n        = get_type_size_bytes(charptr_type);
 399                 set_type_alignment_bytes(charptr_type, align_n);
 400                 loc_name       = new_entity(loc_type, IDENT("name"), charptr_type);
 401                 size           = (size + align_n - 1) & -align_n;
 402                 set_entity_offset(loc_name, size);
 403                 size          += align_n;
 404
 405                 if (align_n > align_l)
 406                         align_l = align_n;
 407                 size = (size + align_l - 1) & -align_l;
 408                 set_type_size_bytes(loc_type, size);
 409                 set_type_state(loc_type, layout_fixed);
 410
 411                 loc_type = new_type_array(IDENT("__locarray"), 1, loc_type);
 412                 set_array_bounds_int(string_type, 0, 0, n_blocks);
 413
 414                 cur_ident      = IDENT("__FIRMPROF__LOCATIONS");
 415                 ent_locations   = new_entity(gtp, cur_ident, loc_type);
 416                 set_entity_ld_ident(ent_locations, cur_ident);
 417         }
 418
 419         /* initialize count array */
 420         NEW_ARR_A(tarval *, tarval_array, n_blocks);
 421         tv = get_tarval_null(mode_Iu);
 422         for (i = 0; i < n_blocks; ++i) {
 423                 tarval_array[i] = tv;
 424         }
 425         set_array_entity_values(bblock_counts, tarval_array, n_blocks);
 426
 427         /* initialize function name string constant */
 428         tarval_string = alloca(sizeof(*tarval_string) * (filename_len));
 429         for (i = 0; i < filename_len; ++i) {
 430                 tarval_string[i] = new_tarval_from_long(filename[i], mode_Bs);
 431         }
 432         set_entity_variability(ent_filename, variability_constant);
 433         set_array_entity_values(ent_filename, tarval_string, filename_len);
 434
 435         /* initialize block id array and instrument blocks */
 436         wd.array     = tarval_array;
 437         wd.id        = 0;
 438         wd.tp_char   = character_type;
 439         wd.flags     = flags;
 440         if (flags & profile_with_locations) {
 441                 wd.fname_map = pmap_create();
 442                 NEW_ARR_A(loc_entry, wd.locs, n_blocks);
 443         }
 444
 445         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 446                 ir_graph      *irg = get_irp_irg(n);
 447                 int            i;
 448                 ir_node       *endbb = get_irg_end_block(irg);
 449                 fix_env       env;
 450
 451                 set_current_ir_graph(irg);
 452
 453                 /* generate a symbolic constant pointing to the count array */
 454                 sym.entity_p = bblock_counts;
 455                 wd.symconst  = new_r_SymConst(irg, get_irg_start_block(irg), sym, symconst_addr_ent);
 456
 457                 irg_block_walk_graph(irg, block_id_walker, NULL, &wd);
 458                 env.start_block = get_irg_start_block(irg);
 459                 env.end_block   = get_irg_end_block(irg);
 460                 set_irn_link(env.start_block, get_irg_no_mem(irg));
 461                 irg_block_walk_graph(irg, fix_ssa, NULL, &env);
 462                 for (i = get_Block_n_cfgpreds(endbb) - 1; i >= 0; --i) {
 463                         ir_node *node = skip_Proj(get_Block_cfgpred(endbb, i));
 464                         ir_node *bb   = get_Block_cfgpred_block(endbb, i);
 465                         ir_node *sync;
 466                         ir_node *ins[2];
 467
 468                         switch (get_irn_opcode(node)) {
 469                         case iro_Return:
 470                                 ins[0] = get_irn_link(bb);
 471                                 ins[1] = get_Return_mem(node);
 472                                 sync   = new_r_Sync(irg, bb, 2, ins);
 473                                 set_Return_mem(node, sync);
 474                                 break;
 475                         case iro_Raise:
 476                                 ins[0] = get_irn_link(bb);
 477                                 ins[1] = get_Raise_mem(node);
 478                                 sync   = new_r_Sync(irg, bb, 2, ins);
 479                                 set_Raise_mem(node, sync);
 480                                 break;
 481                         default:
 482                                 /* a fragile's op exception. There should be another path to End,
 483                                    so ignore it */
 484                                 assert(is_fragile_op(node) && "unexpected End control flow predecessor");
 485                         }
 486                 }
 487         }
 488         set_array_entity_values(bblock_id, tarval_array, n_blocks);
 489
 490         if (flags & profile_with_locations) {
 491                 /* build the initializer for the locations */
 492                 rem = current_ir_graph;
 493                 current_ir_graph = get_const_code_irg();
 494                 ent = get_array_element_entity(loc_type);
 495                 set_entity_variability(ent_locations, variability_constant);
 496                 for (i = 0; i < n_blocks; ++i) {
 497                         compound_graph_path *path;
 498                         tarval *tv;
 499                         ir_node *n;
 500
 501                         /* lineno */
 502                         path = new_compound_graph_path(loc_type, 2);
 503                         set_compound_graph_path_array_index(path, 0, i);
 504                         set_compound_graph_path_node(path, 0, ent);
 505                         set_compound_graph_path_node(path, 1, loc_lineno);
 506                         tv = new_tarval_from_long(wd.locs[i].lineno, mode_Iu);
 507                         add_compound_ent_value_w_path(ent_locations, new_Const(mode_Iu, tv), path);
 508
 509                         /* name */
 510                         path = new_compound_graph_path(loc_type, 2);
 511                         set_compound_graph_path_array_index(path, 0, i);
 512                         set_compound_graph_path_node(path, 0, ent);
 513                         set_compound_graph_path_node(path, 1, loc_name);
 514                         if (wd.locs[i].fname) {
 515                                 sym.entity_p = wd.locs[i].fname;
 516                                 n = new_SymConst(sym, symconst_addr_ent);
 517                         } else {
 518                                 n = new_Const(mode_P_data, get_mode_null(mode_P_data));
 519                         }
 520                         add_compound_ent_value_w_path(ent_locations, n, path);
 521                 }
 522                 pmap_destroy(wd.fname_map);
 523         }
 524         return gen_initializer_irg(ent_filename, bblock_id, bblock_counts, n_blocks);
 525 }
 526
 527 static void
 528 profile_node_info(void *ctx, FILE *f, const ir_node *irn)
 529 {
 530         if(is_Block(irn)) {
 531                 fprintf(f, "profiled execution count: %u\n", be_profile_get_block_execcount(irn));
 532         }
 533 }
 534
 535 static void
 536 register_vcg_hook(void)
 537 {
 538         memset(&hook, 0, sizeof(hook));
 539         hook.hook._hook_node_info = profile_node_info;
 540         register_hook(hook_node_info, &hook);
 541 }
 542
 543 static void
 544 unregister_vcg_hook(void)
 545 {
 546         unregister_hook(hook_node_info, &hook);
 547 }
 548
 549 /**
 550  * Reads the corresponding profile info file if it exists and returns a
 551  * profile info struct
 552  */
 553 void
 554 be_profile_read(const char *filename)
 555 {
 556         FILE   *f;
 557         char    buf[8];
 558         size_t  ret;
 559
 560         f = fopen(filename, "r");
 561         if(f == NULL) {
 562                 return;
 563         }
 564         printf("found profile data '%s'.\n", filename);
 565
 566         /* check magic */
 567         ret = fread(buf, 8, 1, f);
 568         if(ret == 0 || strncmp(buf, "firmprof", 8) != 0) {
 569                 return;
 570         }
 571
 572         if(profile) be_profile_free();
 573         profile = new_set(cmp_execcount, 16);
 574
 575         do {
 576                 execcount_t  query;
 577                 ret = fread(&query, sizeof(unsigned int), 2, f);
 578
 579                 if(ret != 2) break;
 580
 581                 set_insert(profile, &query, sizeof(query), query.block);
 582         } while(1);
 583
 584         fclose(f);
 585         register_vcg_hook();
 586 }
 587
 588 /**
 589  * Frees the profile info
 590  */
 591 void
 592 be_profile_free(void)
 593 {
 594         if(profile) {
 595                 unregister_vcg_hook();
 596                 del_set(profile);
 597         }
 598 }
 599
 600 /**
 601  * Tells whether profile module has acquired data
 602  */
 603 int
 604 be_profile_has_data(void)
 605 {
 606         return (profile != NULL);
 607 }
 608
 609 /**
 610  * Get block execution count as determined be profiling
 611  */
 612 unsigned int
 613 be_profile_get_block_execcount(const ir_node *block)
 614 {
 615         execcount_t *ec, query;
 616
 617         if(!profile)
 618                 return 1;
 619
 620         query.block = get_irn_node_nr(block);
 621         ec = set_find(profile, &query, sizeof(query), get_irn_node_nr(block));
 622
 623         if(ec != NULL) {
 624                 return ec->count;
 625         } else {
 626                 ir_fprintf(stderr, "Warning: Profile contains no data for %+F\n",
 627                            block);
 628                 return 1;
 629         }
 630 }
 631
 632 typedef struct _intialize_execfreq_env_t {
 633         ir_graph *irg;
 634         ir_exec_freq *execfreqs;
 635         double freq_factor;
 636 } initialize_execfreq_env_t;
 637
 638 // minimal execution frequency (an execfreq of 0 confuses algos)
 639 static const double MIN_EXECFREQ = 0.00001;
 640
 641 static void initialize_execfreq(ir_node *block, void *data) {
 642         initialize_execfreq_env_t *env = data;
 643         double freq;
 644
 645         if(block == get_irg_start_block(env->irg)
 646            || block == get_irg_end_block(env->irg)) {
 647                 freq = 1.0;
 648         } else {
 649                 freq = be_profile_get_block_execcount(block);
 650                 freq *= env->freq_factor;
 651                 if(freq < MIN_EXECFREQ)
 652                         freq = MIN_EXECFREQ;
 653         }
 654
 655         set_execfreq(env->execfreqs, block, freq);
 656 }
 657
 658 ir_exec_freq *be_create_execfreqs_from_profile(ir_graph *irg)
 659 {
 660         ir_node *block2 = NULL;
 661         ir_node *start_block;
 662         const ir_edge_t *edge;
 663         initialize_execfreq_env_t env;
 664         unsigned count;
 665
 666         env.irg = irg;
 667         env.execfreqs = create_execfreq(irg);
 668
 669         // find the successor to the start block
 670         start_block = get_irg_start_block(irg);
 671         foreach_block_succ(start_block, edge) {
 672                 ir_node *succ = get_edge_src_irn(edge);
 673                 if(succ != start_block) {
 674                         block2 = succ;
 675                         break;
 676                 }
 677         }
 678         assert(block2 != NULL);
 679
 680         count = be_profile_get_block_execcount(block2);
 681         if(count == 0) {
 682                 // the function was never executed, so fallback to estimated freqs
 683                 free_execfreq(env.execfreqs);
 684
 685                 return compute_execfreq(irg, 10);
 686         }
 687
 688         env.freq_factor = 1.0 / count;
 689         irg_block_walk_graph(irg, initialize_execfreq, NULL, &env);
 690
 691         return env.execfreqs;
 692 }