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 /**
  21  * @file
  22  * @brief       Code instrumentation and execution count profiling.
  23  * @author      Adam M. Szalkowski
  24  * @date        06.04.2006
  25  * @version     $Id$
  26  */
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <math.h>
  32
  33 #include "hashptr.h"
  34 #include "debug.h"
  35 #include "obst.h"
  36 #include "set.h"
  37 #include "list.h"
  38 #include "pmap.h"
  39
  40 #include "irprintf.h"
  41 #include "irgwalk.h"
  42 #include "irdump_t.h"
  43 #include "irnode_t.h"
  44 #include "ircons_t.h"
  45 #include "irloop_t.h"
  46 #include "iredges.h"
  47 #include "execfreq.h"
  48 #include "irvrfy.h"
  49 #include "typerep.h"
  50
  51 #include "be_t.h"
  52 #include "belive_t.h"
  53 #include "besched_t.h"
  54 #include "beirgmod.h"
  55 #include "bearch_t.h"
  56 #include "beabi.h"
  57 #include "benode_t.h"
  58 #include "beutil.h"
  59 #include "ircons.h"
  60 #include "irhooks.h"
  61 #include "iredges.h"
  62
  63 #include "bechordal_t.h"
  64
  65 #include "beprofile.h"
  66
  67 /** An entry in the id-to-location map */
  68 typedef struct loc_entry {
  69         ir_entity    *fname;   /**< the entity holding the file name */
  70         unsigned int lineno;   /**< line number */
  71 } loc_entry;
  72
  73 typedef struct _block_id_walker_data_t {
  74         tarval         **array;    /**< the entity the holds the block counts */
  75         unsigned int   id;         /**< current block id number */
  76         ir_node        *symconst;  /**< the SymConst representing array */
  77         pmap           *fname_map; /**< set containing all found filenames */
  78         loc_entry      *locs;      /**< locations */
  79         ir_type        *tp_char;   /**< the character type */
  80         unsigned       flags;      /**< profile flags */
  81 } block_id_walker_data_t;
  82
  83 typedef struct _execcount_t {
  84         unsigned int block;
  85         unsigned int count;
  86 } execcount_t;
  87
  88 static int
  89 cmp_execcount(const void * a, const void * b, size_t size)
  90 {
  91         (void) size;
  92         return ((execcount_t*)a)->block != ((execcount_t*)b)->block;
  93 }
  94
  95 static void
  96 block_counter(ir_node * bb, void * data)
  97 {
  98         unsigned int  *count = data;
  99         (void) bb;
 100         *count = *count + 1;
 101 }
 102
 103 static unsigned int
 104 count_blocks(ir_graph * irg)
 105 {
 106         unsigned int count = 0;
 107
 108         irg_block_walk_graph(irg, block_counter, NULL, &count);
 109         return count;
 110 }
 111
 112 /* keep the execcounts here because they are only read once per compiler run */
 113 static set * profile = NULL;
 114 static hook_entry_t hook;
 115
 116 /**
 117  * Instrument a block with code needed for profiling
 118  */
 119 static void
 120 instrument_block(ir_node * bb, ir_node * address, unsigned int id)
 121 {
 122         ir_graph *irg = get_irn_irg(bb);
 123         ir_node  *start_block = get_irg_start_block(irg);
 124         ir_node  *load, *store, *offset, *add, *projm, *proji, *unknown;
 125         ir_node  *cnst;
 126
 127         /**
 128          * We can't instrument the end block as there are no real instructions there
 129          */
 130         if(bb == get_irg_end_block(irg))
 131                 return;
 132
 133         unknown = new_r_Unknown(irg, mode_M);
 134         cnst    = new_r_Const_long(irg, start_block, mode_Iu, get_mode_size_bytes(mode_Iu) * id);
 135         offset  = new_r_Add(irg, bb, address, cnst, mode_P);
 136         load    = new_r_Load(irg, bb, unknown, offset, mode_Iu);
 137         projm   = new_r_Proj(irg, bb, load, mode_M, pn_Load_M);
 138         proji   = new_r_Proj(irg, bb, load, mode_Iu, pn_Load_res);
 139         cnst    = new_r_Const_long(irg, start_block, mode_Iu, 1);
 140         add     = new_r_Add(irg, bb, proji, cnst, mode_Iu);
 141         store   = new_r_Store(irg, bb, projm, offset, add);
 142         projm   = new_r_Proj(irg, bb, store, mode_M, pn_Store_M);
 143         set_irn_link(bb, projm);
 144         set_irn_link(projm, load);
 145 }
 146
 147 typedef struct fix_env {
 148         ir_node *end_block;
 149 } fix_env;
 150
 151 /**
 152  * SSA Construction for instrumentation code memory
 153  */
 154 static void
 155 fix_ssa(ir_node * bb, void * data)
 156 {
 157         fix_env *env = data;
 158         ir_node *mem;
 159         int     arity = get_Block_n_cfgpreds(bb);
 160
 161         /* start and end block are not instrumented, skip! */
 162         if (bb == env->end_block)
 163                 return;
 164
 165         if (bb == get_irg_start_block(get_irn_irg(bb))) {
 166                 mem = new_NoMem();
 167         } else if (arity == 1) {
 168                 mem = get_irn_link(get_Block_cfgpred_block(bb, 0));
 169         } else {
 170                 int n;
 171                 ir_node **ins;
 172                 ir_graph *irg = current_ir_graph;
 173
 174                 NEW_ARR_A(ir_node*, ins, arity);
 175                 for (n = arity - 1; n >= 0; --n) {
 176                         ins[n] = get_irn_link(get_Block_cfgpred_block(bb, n));
 177                 }
 178                 mem = new_r_Phi(irg, bb, arity, ins, mode_M);
 179         }
 180         set_Load_mem(get_irn_link(get_irn_link(bb)), mem);
 181 }
 182
 183
 184 /**
 185  * Generates a new irg which calls the initializer
 186  *
 187  * Pseudocode:
 188  *       void __firmprof_initializer(void) { __init_firmprof(ent_filename, bblock_id, bblock_counts, n_blocks); }
 189  */
 190 static ir_graph *
 191 gen_initializer_irg(ir_entity * ent_filename, ir_entity * bblock_id, ir_entity * bblock_counts, int n_blocks)
 192 {
 193         ir_node *start_block;
 194
 195         ir_node   *ins[4];
 196         ident     *name = new_id_from_str("__firmprof_initializer");
 197         ir_entity *ent  = new_entity(get_glob_type(), name, new_type_method(name, 0, 0));
 198         ir_node   *ret, *call, *symconst;
 199         symconst_symbol sym;
 200
 201         ident     *init_name = new_id_from_str("__init_firmprof");
 202         ir_type   *init_type = new_type_method(init_name, 4, 0);
 203         ir_type   *uint, *uintptr, *string;
 204         ir_entity *init_ent;
 205         ir_graph  *irg;
 206         ir_node   *bb;
 207         ir_type   *empty_frame_type;
 208
 209         set_entity_ld_ident(ent, name);
 210
 211         uint    = new_type_primitive(new_id_from_str("__uint"), mode_Iu);
 212         uintptr = new_type_pointer(new_id_from_str("__uintptr"), uint, mode_P);
 213         string  = new_type_pointer(new_id_from_str("__charptr"), new_type_primitive(new_id_from_str("__char"), mode_Bs), mode_P);
 214
 215         set_method_param_type(init_type, 0, string);
 216         set_method_param_type(init_type, 1, uintptr);
 217         set_method_param_type(init_type, 2, uintptr);
 218         set_method_param_type(init_type, 3, uint);
 219         init_ent = new_entity(get_glob_type(), init_name, init_type);
 220         set_entity_ld_ident(init_ent, init_name);
 221
 222         irg = new_ir_graph(ent, 0);
 223         empty_frame_type = get_irg_frame_type(irg);
 224         set_type_size_bytes(empty_frame_type, 0);
 225
 226         bb = get_cur_block();
 227
 228         start_block = get_irg_start_block(irg);
 229
 230         sym.entity_p = init_ent;
 231         symconst     = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 232
 233         sym.entity_p = ent_filename;
 234         ins[0] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 235         sym.entity_p = bblock_id;
 236         ins[1] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 237         sym.entity_p = bblock_counts;
 238         ins[2] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 239         ins[3] = new_r_Const_long(irg, start_block, mode_Iu, n_blocks);
 240
 241         call = new_r_Call(irg, bb, get_irg_initial_mem(irg), symconst, 4, ins, init_type);
 242         ret = new_r_Return(irg, bb, new_r_Proj(irg, bb, call, mode_M, pn_Call_M_regular), 0, NULL);
 243         mature_immBlock(bb);
 244
 245         add_immBlock_pred(get_irg_end_block(irg), ret);
 246         mature_immBlock(get_irg_end_block(irg));
 247
 248         irg_finalize_cons(irg);
 249
 250         return irg;
 251 }
 252
 253 /**
 254  * Create the location data for the given debug info.
 255  */
 256 static void create_location_data(dbg_info *dbg, block_id_walker_data_t *wd)
 257 {
 258         unsigned lineno;
 259         const char *fname = be_retrieve_dbg_info(dbg, &lineno);
 260
 261         if (fname) {
 262                 pmap_entry *entry = pmap_find(wd->fname_map, (void *)fname);
 263                 ir_entity  *ent;
 264
 265                 if (! entry) {
 266                         static unsigned nr = 0;
 267                         ident   *id;
 268                         char    buf[128];
 269                         ir_type *arr;
 270                         int     i, len = strlen(fname) + 1;
 271                         tarval  **tarval_string;
 272
 273                         snprintf(buf, sizeof(buf), "firm_name_arr.%d", nr);
 274                         arr = new_type_array(new_id_from_str(buf), 1, wd->tp_char);
 275                         set_array_bounds_int(arr, 0, 0, len);
 276
 277                         snprintf(buf, sizeof(buf), "__firm_name.%d", nr++);
 278                         id = new_id_from_str(buf);
 279                         ent = new_entity(get_glob_type(), id, arr);
 280                         set_entity_ld_ident(ent, id);
 281
 282                         pmap_insert(wd->fname_map, (void *)fname, ent);
 283
 284                         /* initialize file name string constant */
 285                         tarval_string = alloca(sizeof(*tarval_string) * (len));
 286                         for (i = 0; i < len; ++i) {
 287                                 tarval_string[i] = new_tarval_from_long(fname[i], mode_Bs);
 288                         }
 289                         set_entity_variability(ent, variability_constant);
 290                         set_array_entity_values(ent, tarval_string, len);
 291                 } else {
 292                         ent = entry->value;
 293                 }
 294                 wd->locs[wd->id].fname  = ent;
 295                 wd->locs[wd->id].lineno = lineno;
 296         } else {
 297                 wd->locs[wd->id].fname  = NULL;
 298                 wd->locs[wd->id].lineno = 0;
 299         }
 300 }
 301
 302 /**
 303  * Walker: assigns an ID to every block.
 304  * Builds the string table
 305  */
 306 static void
 307 block_id_walker(ir_node * bb, void * data)
 308 {
 309         block_id_walker_data_t *wd = data;
 310
 311         wd->array[wd->id] = new_tarval_from_long(get_irn_node_nr(bb), mode_Iu);
 312         instrument_block(bb, wd->symconst, wd->id);
 313
 314         if (wd->flags & profile_with_locations) {
 315                 dbg_info *dbg = get_irn_dbg_info(bb);
 316                 create_location_data(dbg, wd);
 317         }
 318         ++wd->id;
 319 }
 320
 321 #define IDENT(x)        new_id_from_chars(x, sizeof(x) - 1)
 322
 323 ir_graph *
 324 be_profile_instrument(const char *filename, unsigned flags)
 325 {
 326         int n, i;
 327         int n_blocks = 0;
 328         ir_entity *bblock_id;
 329         ir_entity *bblock_counts;
 330         ir_entity *ent_filename;
 331         ir_entity *ent_locations = NULL;
 332         ir_entity *loc_lineno = NULL;
 333         ir_entity *loc_name = NULL;
 334         ir_entity *ent;
 335         ir_type *array_type;
 336         ir_type *uint_type;
 337         ir_type *string_type;
 338         ir_type *character_type;
 339         ir_type *loc_type = NULL;
 340         ir_type *charptr_type;
 341         ir_type *gtp;
 342         ir_node *start_block;
 343         tarval **tarval_array;
 344         tarval **tarval_string;
 345         tarval *tv;
 346         int filename_len = strlen(filename)+1;
 347         ident *cur_ident;
 348         int align_l, align_n, size;
 349         ir_graph *rem;
 350         block_id_walker_data_t  wd;
 351         symconst_symbol sym;
 352
 353         /* count the number of block first */
 354         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 355                 ir_graph *irg = get_irp_irg(n);
 356
 357                 n_blocks += count_blocks(irg);
 358         }
 359
 360         /* create all the necessary types and entities. Note that the
 361            types must have a fixed layout, because we already running in the
 362            backend */
 363         uint_type      = new_type_primitive(IDENT("__uint"), mode_Iu);
 364         set_type_alignment_bytes(uint_type, get_type_size_bytes(uint_type));
 365
 366         array_type     = new_type_array(IDENT("__block_info_array"), 1, uint_type);
 367         set_array_bounds_int(array_type, 0, 0, n_blocks);
 368         set_type_size_bytes(array_type, n_blocks * get_mode_size_bytes(mode_Iu));
 369         set_type_alignment_bytes(array_type, get_mode_size_bytes(mode_Iu));
 370         set_type_state(array_type, layout_fixed);
 371
 372         character_type = new_type_primitive(IDENT("__char"), mode_Bs);
 373         string_type    = new_type_array(IDENT("__filename"), 1, character_type);
 374         set_array_bounds_int(string_type, 0, 0, filename_len);
 375         set_type_size_bytes(string_type, filename_len);
 376         set_type_alignment_bytes(string_type, 1);
 377         set_type_state(string_type, layout_fixed);
 378
 379         gtp            = get_glob_type();
 380
 381         cur_ident      = IDENT("__FIRMPROF__BLOCK_IDS");
 382         bblock_id      = new_entity(gtp, cur_ident, array_type);
 383         set_entity_ld_ident(bblock_id, cur_ident);
 384         set_entity_variability(bblock_id, variability_initialized);
 385
 386         cur_ident      = IDENT("__FIRMPROF__BLOCK_COUNTS");
 387         bblock_counts  = new_entity(gtp, cur_ident, array_type);
 388         set_entity_ld_ident(bblock_counts, cur_ident);
 389         set_entity_variability(bblock_counts, variability_initialized);
 390
 391         cur_ident      = IDENT("__FIRMPROF__FILE_NAME");
 392         ent_filename   = new_entity(gtp, cur_ident, string_type);
 393         set_entity_ld_ident(ent_filename, cur_ident);
 394
 395         if (flags & profile_with_locations) {
 396                 loc_type       = new_type_struct(IDENT("__location"));
 397                 loc_lineno     = new_entity(loc_type, IDENT("lineno"), uint_type);
 398                 align_l        = get_type_alignment_bytes(uint_type);
 399                 size           = get_type_size_bytes(uint_type);
 400                 set_entity_offset(loc_lineno, 0);
 401
 402                 charptr_type   = new_type_pointer(IDENT("__charptr"), character_type, mode_P_data);
 403                 align_n        = get_type_size_bytes(charptr_type);
 404                 set_type_alignment_bytes(charptr_type, align_n);
 405                 loc_name       = new_entity(loc_type, IDENT("name"), charptr_type);
 406                 size           = (size + align_n - 1) & -align_n;
 407                 set_entity_offset(loc_name, size);
 408                 size          += align_n;
 409
 410                 if (align_n > align_l)
 411                         align_l = align_n;
 412                 size = (size + align_l - 1) & -align_l;
 413                 set_type_size_bytes(loc_type, size);
 414                 set_type_state(loc_type, layout_fixed);
 415
 416                 loc_type = new_type_array(IDENT("__locarray"), 1, loc_type);
 417                 set_array_bounds_int(string_type, 0, 0, n_blocks);
 418
 419                 cur_ident      = IDENT("__FIRMPROF__LOCATIONS");
 420                 ent_locations   = new_entity(gtp, cur_ident, loc_type);
 421                 set_entity_ld_ident(ent_locations, cur_ident);
 422         }
 423
 424         /* initialize count array */
 425         NEW_ARR_A(tarval *, tarval_array, n_blocks);
 426         tv = get_tarval_null(mode_Iu);
 427         for (i = 0; i < n_blocks; ++i) {
 428                 tarval_array[i] = tv;
 429         }
 430         set_array_entity_values(bblock_counts, tarval_array, n_blocks);
 431
 432         /* initialize function name string constant */
 433         tarval_string = alloca(sizeof(*tarval_string) * (filename_len));
 434         for (i = 0; i < filename_len; ++i) {
 435                 tarval_string[i] = new_tarval_from_long(filename[i], mode_Bs);
 436         }
 437         set_entity_variability(ent_filename, variability_constant);
 438         set_array_entity_values(ent_filename, tarval_string, filename_len);
 439
 440         /* initialize block id array and instrument blocks */
 441         wd.array     = tarval_array;
 442         wd.id        = 0;
 443         wd.tp_char   = character_type;
 444         wd.flags     = flags;
 445         if (flags & profile_with_locations) {
 446                 wd.fname_map = pmap_create();
 447                 NEW_ARR_A(loc_entry, wd.locs, n_blocks);
 448         }
 449
 450         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 451                 ir_graph      *irg = get_irp_irg(n);
 452                 int            i;
 453                 ir_node       *endbb = get_irg_end_block(irg);
 454                 fix_env       env;
 455
 456                 set_current_ir_graph(irg);
 457
 458                 /* generate a symbolic constant pointing to the count array */
 459                 sym.entity_p = bblock_counts;
 460                 wd.symconst  = new_r_SymConst(irg, get_irg_start_block(irg), sym, symconst_addr_ent);
 461
 462                 irg_block_walk_graph(irg, block_id_walker, NULL, &wd);
 463                 start_block = get_irg_start_block(irg);
 464                 env.end_block   = get_irg_end_block(irg);
 465                 irg_block_walk_graph(irg, fix_ssa, NULL, &env);
 466                 for (i = get_Block_n_cfgpreds(endbb) - 1; i >= 0; --i) {
 467                         ir_node *node = skip_Proj(get_Block_cfgpred(endbb, i));
 468                         ir_node *bb   = get_Block_cfgpred_block(endbb, i);
 469                         ir_node *sync;
 470                         ir_node *ins[2];
 471
 472                         switch (get_irn_opcode(node)) {
 473                         case iro_Return:
 474                                 ins[0] = get_irn_link(bb);
 475                                 ins[1] = get_Return_mem(node);
 476                                 sync   = new_r_Sync(irg, bb, 2, ins);
 477                                 set_Return_mem(node, sync);
 478                                 break;
 479                         case iro_Raise:
 480                                 ins[0] = get_irn_link(bb);
 481                                 ins[1] = get_Raise_mem(node);
 482                                 sync   = new_r_Sync(irg, bb, 2, ins);
 483                                 set_Raise_mem(node, sync);
 484                                 break;
 485                         default:
 486                                 /* a fragile's op exception. There should be another path to End,
 487                                    so ignore it */
 488                                 assert(is_fragile_op(node) && "unexpected End control flow predecessor");
 489                         }
 490                 }
 491         }
 492         set_array_entity_values(bblock_id, tarval_array, n_blocks);
 493
 494         if (flags & profile_with_locations) {
 495                 /* build the initializer for the locations */
 496                 rem = current_ir_graph;
 497                 current_ir_graph = get_const_code_irg();
 498                 ent = get_array_element_entity(loc_type);
 499                 set_entity_variability(ent_locations, variability_constant);
 500                 for (i = 0; i < n_blocks; ++i) {
 501                         compound_graph_path *path;
 502                         tarval *tv;
 503                         ir_node *n;
 504
 505                         /* lineno */
 506                         path = new_compound_graph_path(loc_type, 2);
 507                         set_compound_graph_path_array_index(path, 0, i);
 508                         set_compound_graph_path_node(path, 0, ent);
 509                         set_compound_graph_path_node(path, 1, loc_lineno);
 510                         tv = new_tarval_from_long(wd.locs[i].lineno, mode_Iu);
 511                         add_compound_ent_value_w_path(ent_locations, new_Const(mode_Iu, tv), path);
 512
 513                         /* name */
 514                         path = new_compound_graph_path(loc_type, 2);
 515                         set_compound_graph_path_array_index(path, 0, i);
 516                         set_compound_graph_path_node(path, 0, ent);
 517                         set_compound_graph_path_node(path, 1, loc_name);
 518                         if (wd.locs[i].fname) {
 519                                 sym.entity_p = wd.locs[i].fname;
 520                                 n = new_SymConst(sym, symconst_addr_ent);
 521                         } else {
 522                                 n = new_Const(mode_P_data, get_mode_null(mode_P_data));
 523                         }
 524                         add_compound_ent_value_w_path(ent_locations, n, path);
 525                 }
 526                 pmap_destroy(wd.fname_map);
 527         }
 528         return gen_initializer_irg(ent_filename, bblock_id, bblock_counts, n_blocks);
 529 }
 530
 531 static void
 532 profile_node_info(void *ctx, FILE *f, const ir_node *irn)
 533 {
 534         (void) ctx;
 535         if(is_Block(irn)) {
 536                 fprintf(f, "profiled execution count: %u\n", be_profile_get_block_execcount(irn));
 537         }
 538 }
 539
 540 static void
 541 register_vcg_hook(void)
 542 {
 543         memset(&hook, 0, sizeof(hook));
 544         hook.hook._hook_node_info = profile_node_info;
 545         register_hook(hook_node_info, &hook);
 546 }
 547
 548 static void
 549 unregister_vcg_hook(void)
 550 {
 551         unregister_hook(hook_node_info, &hook);
 552 }
 553
 554 /**
 555  * Reads the corresponding profile info file if it exists and returns a
 556  * profile info struct
 557  */
 558 void
 559 be_profile_read(const char *filename)
 560 {
 561         FILE   *f;
 562         char    buf[8];
 563         size_t  ret;
 564
 565         f = fopen(filename, "r");
 566         if(f == NULL) {
 567                 return;
 568         }
 569         printf("found profile data '%s'.\n", filename);
 570
 571         /* check magic */
 572         ret = fread(buf, 8, 1, f);
 573         if(ret == 0 || strncmp(buf, "firmprof", 8) != 0) {
 574                 return;
 575         }
 576
 577         if(profile) be_profile_free();
 578         profile = new_set(cmp_execcount, 16);
 579
 580         do {
 581                 execcount_t  query;
 582                 ret = fread(&query, sizeof(unsigned int), 2, f);
 583
 584                 if(ret != 2) break;
 585
 586                 set_insert(profile, &query, sizeof(query), query.block);
 587         } while(1);
 588
 589         fclose(f);
 590         register_vcg_hook();
 591 }
 592
 593 /**
 594  * Frees the profile info
 595  */
 596 void
 597 be_profile_free(void)
 598 {
 599         if(profile) {
 600                 unregister_vcg_hook();
 601                 del_set(profile);
 602         }
 603 }
 604
 605 /**
 606  * Tells whether profile module has acquired data
 607  */
 608 int
 609 be_profile_has_data(void)
 610 {
 611         return (profile != NULL);
 612 }
 613
 614 /**
 615  * Get block execution count as determined be profiling
 616  */
 617 unsigned int
 618 be_profile_get_block_execcount(const ir_node *block)
 619 {
 620         execcount_t *ec, query;
 621
 622         if(!profile)
 623                 return 1;
 624
 625         query.block = get_irn_node_nr(block);
 626         ec = set_find(profile, &query, sizeof(query), get_irn_node_nr(block));
 627
 628         if(ec != NULL) {
 629                 return ec->count;
 630         } else {
 631                 ir_fprintf(stderr, "Warning: Profile contains no data for %+F\n",
 632                            block);
 633                 return 1;
 634         }
 635 }
 636
 637 typedef struct _intialize_execfreq_env_t {
 638         ir_graph *irg;
 639         ir_exec_freq *execfreqs;
 640         double freq_factor;
 641 } initialize_execfreq_env_t;
 642
 643 // minimal execution frequency (an execfreq of 0 confuses algos)
 644 static const double MIN_EXECFREQ = 0.00001;
 645
 646 static void initialize_execfreq(ir_node *block, void *data) {
 647         initialize_execfreq_env_t *env = data;
 648         double freq;
 649
 650         if(block == get_irg_start_block(env->irg)
 651            || block == get_irg_end_block(env->irg)) {
 652                 freq = 1.0;
 653         } else {
 654                 freq = be_profile_get_block_execcount(block);
 655                 freq *= env->freq_factor;
 656                 if(freq < MIN_EXECFREQ)
 657                         freq = MIN_EXECFREQ;
 658         }
 659
 660         set_execfreq(env->execfreqs, block, freq);
 661 }
 662
 663 ir_exec_freq *be_create_execfreqs_from_profile(ir_graph *irg)
 664 {
 665         ir_node *start_block;
 666         initialize_execfreq_env_t env;
 667         unsigned count;
 668
 669         env.irg = irg;
 670         env.execfreqs = create_execfreq(irg);
 671         start_block = get_irg_start_block(irg);
 672
 673         count = be_profile_get_block_execcount(start_block);
 674         if(count == 0) {
 675                 // the function was never executed, so fallback to estimated freqs
 676                 free_execfreq(env.execfreqs);
 677
 678                 return compute_execfreq(irg, 10);
 679         }
 680
 681         env.freq_factor = 1.0 / count;
 682         irg_block_walk_graph(irg, initialize_execfreq, NULL, &env);
 683
 684         return env.execfreqs;
 685 }