nsz Git - libfirm/blob - ir/ir/irprofile.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       Code instrumentation and execution count profiling.
  23  * @author      Adam M. Szalkowski
  24  * @date        06.04.2006
  25  * @version     $Id$
  26  */
  27 #include "config.h"
  28
  29 #include <math.h>
  30
  31 #include "hashptr.h"
  32 #include "debug.h"
  33 #include "obst.h"
  34 #include "set.h"
  35 #include "list.h"
  36 #include "pmap.h"
  37 #include "array_t.h"
  38
  39 #include "irprintf.h"
  40 #include "irgwalk.h"
  41 #include "irdump_t.h"
  42 #include "irnode_t.h"
  43 #include "ircons_t.h"
  44 #include "execfreq.h"
  45 #include "typerep.h"
  46
  47 #include "dbginfo.h"
  48 #include "irhooks.h"
  49 #include "iredges.h"
  50
  51 #include "irprofile.h"
  52
  53 /** An entry in the id-to-location map */
  54 typedef struct loc_entry {
  55         ir_entity    *fname;   /**< the entity holding the file name */
  56         unsigned int lineno;   /**< line number */
  57 } loc_entry;
  58
  59 typedef struct _block_id_walker_data_t {
  60         tarval         **array;    /**< the entity the holds the block counts */
  61         unsigned int   id;         /**< current block id number */
  62         ir_node        *symconst;  /**< the SymConst representing array */
  63         pmap           *fname_map; /**< set containing all found filenames */
  64         loc_entry      *locs;      /**< locations */
  65         ir_type        *tp_char;   /**< the character type */
  66         unsigned       flags;      /**< profile flags */
  67 } block_id_walker_data_t;
  68
  69 typedef struct _execcount_t {
  70         unsigned long block;
  71         unsigned int count;
  72 } execcount_t;
  73
  74 /**
  75  * Compare two execcount_t entries.
  76  */
  77 static int cmp_execcount(const void *a, const void *b, size_t size) {
  78         const execcount_t *ea = a;
  79         const execcount_t *eb = b;
  80         (void) size;
  81         return ea->block != eb->block;
  82 }
  83
  84 /**
  85  * Block walker, count number of blocks.
  86  */
  87 static void block_counter(ir_node * bb, void * data) {
  88         unsigned int *count = data;
  89         (void) bb;
  90         *count = *count + 1;
  91 }
  92
  93 /**
  94  * Return the number of blocks the given graph.
  95  */
  96 static unsigned int count_blocks(ir_graph *irg) {
  97         unsigned int count = 0;
  98
  99         irg_block_walk_graph(irg, block_counter, NULL, &count);
 100         return count;
 101 }
 102
 103 /* keep the execcounts here because they are only read once per compiler run */
 104 static set * profile = NULL;
 105 static hook_entry_t hook;
 106
 107 /**
 108  * Instrument a block with code needed for profiling
 109  */
 110 static void
 111 instrument_block(ir_node *bb, ir_node *address, unsigned int id)
 112 {
 113         ir_graph *irg = get_irn_irg(bb);
 114         ir_node  *load, *store, *offset, *add, *projm, *proji, *unknown;
 115         ir_node  *cnst;
 116
 117         /**
 118          * We can't instrument the end block as there are no real instructions there
 119          */
 120         if(bb == get_irg_end_block(irg))
 121                 return;
 122
 123         unknown = new_r_Unknown(irg, mode_M);
 124         cnst    = new_r_Const_long(irg, mode_Iu, get_mode_size_bytes(mode_Iu) * id);
 125         offset  = new_r_Add(bb, address, cnst, get_modeP_data());
 126         load    = new_r_Load(bb, unknown, offset, mode_Iu, 0);
 127         projm   = new_r_Proj(bb, load, mode_M, pn_Load_M);
 128         proji   = new_r_Proj(bb, load, mode_Iu, pn_Load_res);
 129         cnst    = new_r_Const_long(irg, mode_Iu, 1);
 130         add     = new_r_Add(bb, proji, cnst, mode_Iu);
 131         store   = new_r_Store(bb, projm, offset, add, 0);
 132         projm   = new_r_Proj(bb, store, mode_M, pn_Store_M);
 133         set_irn_link(bb, projm);
 134         set_irn_link(projm, load);
 135 }
 136
 137 typedef struct fix_env {
 138         ir_node *end_block;
 139 } fix_env;
 140
 141 /**
 142  * SSA Construction for instrumentation code memory
 143  */
 144 static void
 145 fix_ssa(ir_node * bb, void * data)
 146 {
 147         fix_env *env = data;
 148         ir_node *mem;
 149         int     arity = get_Block_n_cfgpreds(bb);
 150
 151         /* end block are not instrumented, skip! */
 152         if (bb == env->end_block)
 153                 return;
 154
 155         if (bb == get_irg_start_block(get_irn_irg(bb))) {
 156                 mem = get_irg_initial_mem(get_irn_irg(bb));
 157         } else if (arity == 1) {
 158                 mem = get_irn_link(get_Block_cfgpred_block(bb, 0));
 159         } else {
 160                 int n;
 161                 ir_node **ins;
 162
 163                 NEW_ARR_A(ir_node*, ins, arity);
 164                 for (n = arity - 1; n >= 0; --n) {
 165                         ins[n] = get_irn_link(get_Block_cfgpred_block(bb, n));
 166                 }
 167                 mem = new_r_Phi(bb, arity, ins, mode_M);
 168         }
 169         set_Load_mem(get_irn_link(get_irn_link(bb)), mem);
 170 }
 171
 172 static void add_constructor(ir_entity *method)
 173 {
 174     ir_type   *method_type  = get_entity_type(method);
 175     ir_type   *ptr_type     = new_type_pointer(method_type);
 176
 177     ir_type   *constructors = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
 178     ident     *ide          = id_unique("constructor_ptr.%u");
 179     ir_entity *ptr          = new_entity(constructors, ide, ptr_type);
 180         ir_graph  *irg          = get_const_code_irg();
 181     ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
 182                                                            method, NULL);
 183
 184     set_entity_compiler_generated(ptr, 1);
 185     set_entity_variability(ptr, variability_constant);
 186     set_atomic_ent_value(ptr, val);
 187 }
 188
 189 /**
 190  * Generates a new irg which calls the initializer
 191  *
 192  * Pseudocode:
 193  *       void __firmprof_initializer(void) { __init_firmprof(ent_filename, bblock_id, bblock_counts, n_blocks); }
 194  */
 195 static ir_graph *
 196 gen_initializer_irg(ir_entity *ent_filename, ir_entity *bblock_id, ir_entity *bblock_counts, int n_blocks)
 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(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(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(mode_Iu);
 215         uintptr = new_type_pointer(uint);
 216         string  = new_type_pointer(new_type_primitive(mode_Bs));
 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         set_type_state(empty_frame_type, layout_fixed);
 229
 230         bb = get_cur_block();
 231
 232         sym.entity_p = init_ent;
 233         symconst     = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
 234
 235         sym.entity_p = ent_filename;
 236         ins[0] = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
 237         sym.entity_p = bblock_id;
 238         ins[1] = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
 239         sym.entity_p = bblock_counts;
 240         ins[2] = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
 241         ins[3] = new_r_Const_long(irg, mode_Iu, n_blocks);
 242
 243         call = new_r_Call(bb, get_irg_initial_mem(irg), symconst, 4, ins, init_type);
 244         ret = new_r_Return(bb, new_r_Proj(bb, call, mode_M, pn_Call_M), 0, NULL);
 245         mature_immBlock(bb);
 246
 247         add_immBlock_pred(get_irg_end_block(irg), ret);
 248         mature_immBlock(get_irg_end_block(irg));
 249
 250         irg_finalize_cons(irg);
 251
 252         add_constructor(ent);
 253
 254         return irg;
 255 }
 256
 257 /**
 258  * Create the location data for the given debug info.
 259  */
 260 static void create_location_data(dbg_info *dbg, block_id_walker_data_t *wd)
 261 {
 262         unsigned lineno;
 263         const char *fname = ir_retrieve_dbg_info(dbg, &lineno);
 264
 265         if (fname) {
 266                 pmap_entry *entry = pmap_find(wd->fname_map, (void *)fname);
 267                 ir_entity  *ent;
 268
 269                 if (! entry) {
 270                         static unsigned nr = 0;
 271                         ident   *id;
 272                         char    buf[128];
 273                         ir_type *arr;
 274                         int     i, len = strlen(fname) + 1;
 275                         tarval  **tarval_string;
 276
 277                         snprintf(buf, sizeof(buf), "firm_name_arr.%d", nr);
 278                         arr = new_type_array(1, wd->tp_char);
 279                         set_array_bounds_int(arr, 0, 0, len);
 280
 281                         snprintf(buf, sizeof(buf), "__firm_name.%d", nr++);
 282                         id = new_id_from_str(buf);
 283                         ent = new_entity(get_glob_type(), id, arr);
 284                         set_entity_ld_ident(ent, id);
 285
 286                         pmap_insert(wd->fname_map, (void *)fname, ent);
 287
 288                         /* initialize file name string constant */
 289                         tarval_string = ALLOCAN(tarval*, len);
 290                         for (i = 0; i < len; ++i) {
 291                                 tarval_string[i] = new_tarval_from_long(fname[i], mode_Bs);
 292                         }
 293                         set_entity_variability(ent, variability_constant);
 294                         set_array_entity_values(ent, tarval_string, len);
 295                 } else {
 296                         ent = entry->value;
 297                 }
 298                 wd->locs[wd->id].fname  = ent;
 299                 wd->locs[wd->id].lineno = lineno;
 300         } else {
 301                 wd->locs[wd->id].fname  = NULL;
 302                 wd->locs[wd->id].lineno = 0;
 303         }
 304 }
 305
 306 /**
 307  * Walker: assigns an ID to every block.
 308  * Builds the string table
 309  */
 310 static void
 311 block_id_walker(ir_node * bb, void * data)
 312 {
 313         block_id_walker_data_t *wd = data;
 314
 315         wd->array[wd->id] = new_tarval_from_long(get_irn_node_nr(bb), mode_Iu);
 316         instrument_block(bb, wd->symconst, wd->id);
 317
 318         if (wd->flags & profile_with_locations) {
 319                 dbg_info *dbg = get_irn_dbg_info(bb);
 320                 create_location_data(dbg, wd);
 321         }
 322         ++wd->id;
 323 }
 324
 325 #define IDENT(x)        new_id_from_chars(x, sizeof(x) - 1)
 326
 327 ir_graph *
 328 ir_profile_instrument(const char *filename, unsigned flags)
 329 {
 330         int n, i;
 331         int n_blocks = 0;
 332         ir_entity *bblock_id;
 333         ir_entity *bblock_counts;
 334         ir_entity *ent_filename;
 335         ir_entity *ent_locations = NULL;
 336         ir_entity *loc_lineno = NULL;
 337         ir_entity *loc_name = NULL;
 338         ir_entity *ent;
 339         ir_type *array_type;
 340         ir_type *uint_type;
 341         ir_type *string_type;
 342         ir_type *character_type;
 343         ir_type *loc_type = NULL;
 344         ir_type *charptr_type;
 345         ir_type *gtp;
 346         ir_node *start_block;
 347         tarval **tarval_array;
 348         tarval **tarval_string;
 349         tarval *tv;
 350         int filename_len = strlen(filename)+1;
 351         ident *cur_ident;
 352         unsigned align_l, align_n, size;
 353         ir_graph *rem;
 354         block_id_walker_data_t  wd;
 355         symconst_symbol sym;
 356
 357         /* count the number of block first */
 358         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 359                 ir_graph *irg = get_irp_irg(n);
 360
 361                 n_blocks += count_blocks(irg);
 362         }
 363
 364         /* create all the necessary types and entities. Note that the
 365            types must have a fixed layout, because we already running in the
 366            backend */
 367         uint_type      = new_type_primitive(mode_Iu);
 368         set_type_alignment_bytes(uint_type, get_type_size_bytes(uint_type));
 369
 370         array_type     = new_type_array(1, uint_type);
 371         set_array_bounds_int(array_type, 0, 0, n_blocks);
 372         set_type_size_bytes(array_type, n_blocks * get_mode_size_bytes(mode_Iu));
 373         set_type_alignment_bytes(array_type, get_mode_size_bytes(mode_Iu));
 374         set_type_state(array_type, layout_fixed);
 375
 376         character_type = new_type_primitive(mode_Bs);
 377         string_type    = new_type_array(1, character_type);
 378         set_array_bounds_int(string_type, 0, 0, filename_len);
 379         set_type_size_bytes(string_type, filename_len);
 380         set_type_alignment_bytes(string_type, 1);
 381         set_type_state(string_type, layout_fixed);
 382
 383         gtp            = get_glob_type();
 384
 385         cur_ident      = IDENT("__FIRMPROF__BLOCK_IDS");
 386         bblock_id      = new_entity(gtp, cur_ident, array_type);
 387         set_entity_ld_ident(bblock_id, cur_ident);
 388         set_entity_variability(bblock_id, variability_initialized);
 389
 390         cur_ident      = IDENT("__FIRMPROF__BLOCK_COUNTS");
 391         bblock_counts  = new_entity(gtp, cur_ident, array_type);
 392         set_entity_ld_ident(bblock_counts, cur_ident);
 393         set_entity_variability(bblock_counts, variability_initialized);
 394
 395         cur_ident      = IDENT("__FIRMPROF__FILE_NAME");
 396         ent_filename   = new_entity(gtp, cur_ident, string_type);
 397         set_entity_ld_ident(ent_filename, cur_ident);
 398
 399         if (flags & profile_with_locations) {
 400                 loc_type       = new_type_struct(IDENT("__location"));
 401                 loc_lineno     = new_entity(loc_type, IDENT("lineno"), uint_type);
 402                 align_l        = get_type_alignment_bytes(uint_type);
 403                 size           = get_type_size_bytes(uint_type);
 404                 set_entity_offset(loc_lineno, 0);
 405
 406                 charptr_type   = new_type_pointer(character_type);
 407                 align_n        = get_type_size_bytes(charptr_type);
 408                 set_type_alignment_bytes(charptr_type, align_n);
 409                 loc_name       = new_entity(loc_type, IDENT("name"), charptr_type);
 410                 size           = (size + align_n - 1) & ~(align_n - 1);
 411                 set_entity_offset(loc_name, size);
 412                 size          += align_n;
 413
 414                 if (align_n > align_l)
 415                         align_l = align_n;
 416                 size = (size + align_l - 1) & ~(align_l - 1);
 417                 set_type_size_bytes(loc_type, size);
 418                 set_type_state(loc_type, layout_fixed);
 419
 420                 loc_type = new_type_array(1, loc_type);
 421                 set_array_bounds_int(string_type, 0, 0, n_blocks);
 422
 423                 cur_ident     = IDENT("__FIRMPROF__LOCATIONS");
 424                 ent_locations = new_entity(gtp, cur_ident, loc_type);
 425                 set_entity_ld_ident(ent_locations, cur_ident);
 426         }
 427
 428         /* initialize count array */
 429         NEW_ARR_A(tarval *, tarval_array, n_blocks);
 430         tv = get_tarval_null(mode_Iu);
 431         for (i = 0; i < n_blocks; ++i) {
 432                 tarval_array[i] = tv;
 433         }
 434         set_array_entity_values(bblock_counts, tarval_array, n_blocks);
 435
 436         /* initialize function name string constant */
 437         tarval_string = ALLOCAN(tarval*, filename_len);
 438         for (i = 0; i < filename_len; ++i) {
 439                 tarval_string[i] = new_tarval_from_long(filename[i], mode_Bs);
 440         }
 441         set_entity_variability(ent_filename, variability_constant);
 442         set_array_entity_values(ent_filename, tarval_string, filename_len);
 443
 444         /* initialize block id array and instrument blocks */
 445         wd.array     = tarval_array;
 446         wd.id        = 0;
 447         wd.tp_char   = character_type;
 448         wd.flags     = flags;
 449         if (flags & profile_with_locations) {
 450                 wd.fname_map = pmap_create();
 451                 NEW_ARR_A(loc_entry, wd.locs, n_blocks);
 452         }
 453
 454         for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 455                 ir_graph      *irg = get_irp_irg(n);
 456                 int            i;
 457                 ir_node       *endbb = get_irg_end_block(irg);
 458                 fix_env       env;
 459
 460                 set_current_ir_graph(irg);
 461
 462                 /* generate a symbolic constant pointing to the count array */
 463                 sym.entity_p = bblock_counts;
 464                 wd.symconst  = new_r_SymConst(irg, mode_P_data, sym, symconst_addr_ent);
 465
 466                 irg_block_walk_graph(irg, block_id_walker, NULL, &wd);
 467                 start_block = get_irg_start_block(irg);
 468                 env.end_block   = get_irg_end_block(irg);
 469                 irg_block_walk_graph(irg, fix_ssa, NULL, &env);
 470                 for (i = get_Block_n_cfgpreds(endbb) - 1; i >= 0; --i) {
 471                         ir_node *node = skip_Proj(get_Block_cfgpred(endbb, i));
 472                         ir_node *bb   = get_Block_cfgpred_block(endbb, i);
 473                         ir_node *sync;
 474                         ir_node *ins[2];
 475
 476                         switch (get_irn_opcode(node)) {
 477                         case iro_Return:
 478                                 ins[0] = get_irn_link(bb);
 479                                 ins[1] = get_Return_mem(node);
 480                                 sync   = new_r_Sync(bb, 2, ins);
 481                                 set_Return_mem(node, sync);
 482                                 break;
 483                         case iro_Raise:
 484                                 ins[0] = get_irn_link(bb);
 485                                 ins[1] = get_Raise_mem(node);
 486                                 sync   = new_r_Sync(bb, 2, ins);
 487                                 set_Raise_mem(node, sync);
 488                                 break;
 489                         default:
 490                                 /* a fragile's op exception. There should be another path to End,
 491                                    so ignore it */
 492                                 assert(is_fragile_op(node) && "unexpected End control flow predecessor");
 493                         }
 494                 }
 495         }
 496         set_array_entity_values(bblock_id, tarval_array, n_blocks);
 497
 498         if (flags & profile_with_locations) {
 499                 /* build the initializer for the locations */
 500                 rem = current_ir_graph;
 501                 current_ir_graph = get_const_code_irg();
 502                 ent = get_array_element_entity(loc_type);
 503                 set_entity_variability(ent_locations, variability_constant);
 504                 for (i = 0; i < n_blocks; ++i) {
 505                         compound_graph_path *path;
 506                         tarval *tv;
 507                         ir_node *n;
 508
 509                         /* lineno */
 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_lineno);
 514                         tv = new_tarval_from_long(wd.locs[i].lineno, mode_Iu);
 515                         add_compound_ent_value_w_path(ent_locations, new_Const(tv), path);
 516
 517                         /* name */
 518                         path = new_compound_graph_path(loc_type, 2);
 519                         set_compound_graph_path_array_index(path, 0, i);
 520                         set_compound_graph_path_node(path, 0, ent);
 521                         set_compound_graph_path_node(path, 1, loc_name);
 522                         if (wd.locs[i].fname) {
 523                                 sym.entity_p = wd.locs[i].fname;
 524                                 n = new_SymConst(mode_P_data, sym, symconst_addr_ent);
 525                         } else {
 526                                 n = new_Const(get_mode_null(mode_P_data));
 527                         }
 528                         add_compound_ent_value_w_path(ent_locations, n, path);
 529                 }
 530                 pmap_destroy(wd.fname_map);
 531         }
 532         return gen_initializer_irg(ent_filename, bblock_id, bblock_counts, n_blocks);
 533 }
 534
 535 static void
 536 profile_node_info(void *ctx, FILE *f, const ir_node *irn)
 537 {
 538         (void) ctx;
 539         if(is_Block(irn)) {
 540                 fprintf(f, "profiled execution count: %u\n", ir_profile_get_block_execcount(irn));
 541         }
 542 }
 543
 544 static void
 545 register_vcg_hook(void)
 546 {
 547         memset(&hook, 0, sizeof(hook));
 548         hook.hook._hook_node_info = profile_node_info;
 549         register_hook(hook_node_info, &hook);
 550 }
 551
 552 static void
 553 unregister_vcg_hook(void)
 554 {
 555         unregister_hook(hook_node_info, &hook);
 556 }
 557
 558 /**
 559  * Reads the corresponding profile info file if it exists and returns a
 560  * profile info struct
 561  */
 562 void
 563 ir_profile_read(const char *filename)
 564 {
 565         FILE   *f;
 566         char    buf[8];
 567         size_t  ret;
 568
 569         f = fopen(filename, "r");
 570         if(f == NULL) {
 571                 return;
 572         }
 573         printf("found profile data '%s'.\n", filename);
 574
 575         /* check magic */
 576         ret = fread(buf, 8, 1, f);
 577         if(ret == 0 || strncmp(buf, "firmprof", 8) != 0) {
 578                 return;
 579         }
 580
 581         if(profile) ir_profile_free();
 582         profile = new_set(cmp_execcount, 16);
 583
 584         do {
 585                 execcount_t  query;
 586                 ret = fread(&query, sizeof(unsigned int), 2, f);
 587
 588                 if(ret != 2) break;
 589
 590                 set_insert(profile, &query, sizeof(query), query.block);
 591         } while(1);
 592
 593         fclose(f);
 594         register_vcg_hook();
 595 }
 596
 597 /**
 598  * Frees the profile info
 599  */
 600 void
 601 ir_profile_free(void)
 602 {
 603         if(profile) {
 604                 unregister_vcg_hook();
 605                 del_set(profile);
 606         }
 607 }
 608
 609 /**
 610  * Tells whether profile module has acquired data
 611  */
 612 int
 613 ir_profile_has_data(void)
 614 {
 615         return (profile != NULL);
 616 }
 617
 618 /**
 619  * Get block execution count as determined be profiling
 620  */
 621 unsigned int
 622 ir_profile_get_block_execcount(const ir_node *block)
 623 {
 624         execcount_t *ec, query;
 625
 626         if(!profile)
 627                 return 1;
 628
 629         query.block = get_irn_node_nr(block);
 630         ec = set_find(profile, &query, sizeof(query), get_irn_node_nr(block));
 631
 632         if(ec != NULL) {
 633                 return ec->count;
 634         } else {
 635                 ir_fprintf(stderr, "Warning: Profile contains no data for %+F\n",
 636                            block);
 637                 return 1;
 638         }
 639 }
 640
 641 typedef struct _intialize_execfreq_env_t {
 642         ir_graph *irg;
 643         ir_exec_freq *execfreqs;
 644         double freq_factor;
 645 } initialize_execfreq_env_t;
 646
 647 // minimal execution frequency (an execfreq of 0 confuses algos)
 648 static const double MIN_EXECFREQ = 0.00001;
 649
 650 static void initialize_execfreq(ir_node *block, void *data) {
 651         initialize_execfreq_env_t *env = data;
 652         double freq;
 653
 654         if(block == get_irg_start_block(env->irg)
 655            || block == get_irg_end_block(env->irg)) {
 656                 freq = 1.0;
 657         } else {
 658                 freq = ir_profile_get_block_execcount(block);
 659                 freq *= env->freq_factor;
 660                 if(freq < MIN_EXECFREQ)
 661                         freq = MIN_EXECFREQ;
 662         }
 663
 664         set_execfreq(env->execfreqs, block, freq);
 665 }
 666
 667 ir_exec_freq *ir_create_execfreqs_from_profile(ir_graph *irg)
 668 {
 669         ir_node *start_block;
 670         initialize_execfreq_env_t env;
 671         unsigned count;
 672
 673         env.irg = irg;
 674         env.execfreqs = create_execfreq(irg);
 675         start_block = get_irg_start_block(irg);
 676
 677         count = ir_profile_get_block_execcount(start_block);
 678         if(count == 0) {
 679                 // the function was never executed, so fallback to estimated freqs
 680                 free_execfreq(env.execfreqs);
 681
 682                 return compute_execfreq(irg, 10);
 683         }
 684
 685         env.freq_factor = 1.0 / count;
 686         irg_block_walk_graph(irg, initialize_execfreq, NULL, &env);
 687
 688         return env.execfreqs;
 689 }