X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbeprofile.c;h=fd3165bc9ef1fefd31ef615ca6ee01fcecef7fd5;hb=48f0393daa5d5a14ed7e3e32ee2b090759c9371e;hp=791741e0108250e25425402d3eaa32f498890f5e;hpb=4d17ea74a9dc5f95f4e000c281d220667c340974;p=libfirm

diff --git a/ir/be/beprofile.c b/ir/be/beprofile.c
index 791741e01..fd3165bc9 100644
--- a/ir/be/beprofile.c
+++ b/ir/be/beprofile.c
@@ -2,6 +2,7 @@
  * @file   beprofile.c
  * @date   2006-04-06
  * @author Adam M. Szalkowski
+ * @cvs-id $Id$
  *
  * Code instrumentation and execution count profiling
  *
@@ -21,23 +22,18 @@
 #include "list.h"
 #include "pmap.h"
 
+#include "entity.h"
 #include "irprintf.h"
 #include "irgwalk.h"
 #include "irdump_t.h"
 #include "irnode_t.h"
 #include "ircons_t.h"
 #include "irloop_t.h"
-#include "phiclass_t.h"
 #include "iredges.h"
 #include "execfreq.h"
 #include "irvrfy.h"
-
-#include <lpp/lpp.h>
-#include <lpp/mps.h>
-#include <lpp/lpp_net.h>
-#include <lpp/lpp_cplex.h>
-//#include <lc_pset.h>
-//#include <libcore/lc_bitset.h>
+#include "type.h"
+#include "entity.h"
 
 #include "be_t.h"
 #include "belive_t.h"
@@ -47,9 +43,9 @@
 #include "beabi.h"
 #include "benode_t.h"
 #include "beutil.h"
-#include "bespillremat.h"
-#include "bespill.h"
-#include "bepressurestat.h"
+#include "ircons.h"
+#include "irhooks.h"
+#include "iredges.h"
 
 #include "bechordal_t.h"
 
@@ -58,11 +54,34 @@
 #include <libcore/lc_opts_enum.h>
 #endif /* WITH_LIBCORE */
 
-typedef struct _block_id_walker_data {
-	tarval        **array;
-	unsigned int    id;
-	const ir_node  *symconst;
-} block_id_walker_data;
+#include "beprofile.h"
+
+/** An entry in the id-to-location map */
+typedef struct loc_entry {
+	entity       *fname;   /**< the entity holding the file name */
+	unsigned int lineno;   /**< line number */
+} loc_entry;
+
+typedef struct _block_id_walker_data_t {
+	tarval         **array;    /**< the entity the holds the block counts */
+	unsigned int   id;         /**< current block id number */
+	ir_node        *symconst;  /**< the SymConst representing array */
+	pmap           *fname_map; /**< set containing all found filenames */
+	loc_entry      *locs;      /**< locations */
+	ir_type        *tp_char;   /**< the character type */
+	unsigned       flags;      /**< profile flags */
+} block_id_walker_data_t;
+
+typedef struct _execcount_t {
+	unsigned int block;
+	unsigned int count;
+} execcount_t;
+
+static int
+cmp_execcount(const void * a, const void * b, size_t size)
+{
+	return ((execcount_t*)a)->block != ((execcount_t*)b)->block;
+}
 
 static void
 block_counter(ir_node * bb, void * data)
@@ -72,7 +91,7 @@ block_counter(ir_node * bb, void * data)
 }
 
 static unsigned int
-count_blocks(const ir_graph * irg)
+count_blocks(ir_graph * irg)
 {
 	unsigned int count = 0;
 
@@ -80,135 +99,581 @@ count_blocks(const ir_graph * irg)
 	return count;
 }
 
+/* keep the execcounts here because they are only read once per compiler run */
+static set * profile = NULL;
+static hook_entry_t hook;
+
 /**
  * Instrument a block with code needed for profiling
  */
 static void
-instrument_block(const ir_node * bb, const ir_node * address, unsigned int id)
+instrument_block(ir_node * bb, ir_node * address, unsigned int id)
 {
-	ir_node  *load, *store, *offset, *add, *projm, *proji;
+	ir_graph *irg = get_irn_irg(bb);
+	ir_node  *start_block = get_irg_start_block(irg);
+	ir_node  *load, *store, *offset, *add, *projm, *proji, *unknown;
+	ir_node  *cnst;
+
+	/**
+	 * We can't instrument the start and end block as there are no real
+	 * instructions in these blocks
+	 */
+	if(bb == start_block || bb == get_irg_end_block(irg))
+		return;
+
+	unknown = new_r_Unknown(irg, mode_M);
+	cnst    = new_r_Const_long(irg, start_block, mode_Iu, get_mode_size_bytes(mode_Iu) * id);
+	offset  = new_r_Add(irg, bb, address, cnst, mode_P);
+	load    = new_r_Load(irg, bb, unknown, offset, mode_Iu);
+	projm   = new_r_Proj(irg, bb, load, mode_M, pn_Load_M);
+	proji   = new_r_Proj(irg, bb, load, mode_Iu, pn_Load_res);
+	cnst    = new_r_Const_long(irg, start_block, mode_Iu, 1);
+	add     = new_r_Add(irg, bb, proji, cnst, mode_Iu);
+	store   = new_r_Store(irg, bb, projm, offset, add);
+	projm   = new_r_Proj(irg, bb, store, mode_M, pn_Store_M);
+	set_irn_link(bb, projm);
+	set_irn_link(projm, load);
+}
+
+typedef struct fix_env {
+	ir_node *start_block;
+	ir_node *end_block;
+} fix_env;
 
-	offset = new_r_Add(get_irn_irg(bb), bb, address, new_Const_long(mode_Is, get_mode_size_bytes(mode_Iu)*id), mode_P);
-	load = new_r_Load(get_irn_irg(bb), bb, new_NoMem(), offset, mode_Iu);
-	projm = new_r_Proj(get_irn_irg(bb), bb, load, mode_M, 0);
-	proji = new_r_Proj(get_irn_irg(bb), bb, load, mode_Iu, 2);
-	add = new_r_Add(get_irn_irg(bb), bb, proji, new_Const_long(mode_Iu, 1), mode_Iu);
-	store = new_r_Store(get_irn_irg(bb), bb, projm, offset, add);
-	keep_alive(new_r_Proj(get_irn_irg(bb), bb, load, mode_M, 0));
+/**
+ * SSA Construction for instrumentation code memory
+ */
+static void
+fix_ssa(ir_node * bb, void * data)
+{
+	fix_env *env = data;
+	ir_node *mem;
+	int     arity = get_Block_n_cfgpreds(bb);
+
+	/* start and end block are not instrumented, skip! */
+	if (bb == env->start_block || bb == env->end_block)
+		return;
+
+	if (arity == 1) {
+		mem = get_irn_link(get_Block_cfgpred_block(bb, 0));
+	} else {
+		int n;
+		ir_node **ins;
+		ir_graph *irg = current_ir_graph;
+
+		NEW_ARR_A(ir_node*, ins, arity);
+		for (n = arity - 1; n >= 0; --n) {
+			ins[n] = get_irn_link(get_Block_cfgpred_block(bb, n));
+		}
+		mem = new_r_Phi(irg, bb, arity, ins, mode_M);
+	}
+	set_Load_mem(get_irn_link(get_irn_link(bb)), mem);
 }
 
+
 /**
  * Generates a new irg which calls the initializer
+ *
+ * Pseudocode:
+ *	 void __firmprof_initializer(void) { __init_firmprof(ent_filename, bblock_id, bblock_counts, n_blocks); }
  */
 static ir_graph *
-gen_initializer_irg(entity * bblock_id, entitiy * bblock_counts, entity * bblock_count)
+gen_initializer_irg(entity * ent_filename, entity * bblock_id, entity * bblock_counts, int n_blocks)
 {
-	ir_graph  *irg;
-	ir_node   *ins[3] = {bblock_id, bblock_counts, bblock_count};
+	ir_node *start_block;
+
+	ir_node   *ins[4];
 	ident     *name = new_id_from_str("__firmprof_initializer");
-	entity    *ent = new_entity(get_glob_type(), name, new_type_method(name, 0, 0));
-	ir_node   *ret, *call;
+	entity    *ent  = new_entity(get_glob_type(), name, new_type_method(name, 0, 0));
+	ir_node   *ret, *call, *symconst;
+	symconst_symbol sym;
 
 	ident     *init_name = new_id_from_str("__init_firmprof");
-	type      *init_type = new_type_method(init_name, 3, 0);
-	/* TODO */
-	set_method_param_type(init_type, 0, arrayptr);
-	set_method_param_type(init_type, 1, arrayptr);
-	set_method_param_type(init_type, 2, uint);
-	entify    *init_ent = new_entity(get_glob_type(), init_name, init_type);
+	ir_type   *init_type = new_type_method(init_name, 4, 0);
+	ir_type   *uint, *uintptr, *string;
+	entity    *init_ent;
+	ir_graph  *irg;
+	ir_node   *bb;
+	ir_type   *empty_frame_type;
+
+	set_entity_ld_ident(ent, name);
+
+	uint    = new_type_primitive(new_id_from_str("__uint"), mode_Iu);
+	uintptr = new_type_pointer(new_id_from_str("__uintptr"), uint, mode_P);
+	string  = new_type_pointer(new_id_from_str("__charptr"), new_type_primitive(new_id_from_str("__char"), mode_Bs), mode_P);
+
+	set_method_param_type(init_type, 0, string);
+	set_method_param_type(init_type, 1, uintptr);
+	set_method_param_type(init_type, 2, uintptr);
+	set_method_param_type(init_type, 3, uint);
+	init_ent = new_entity(get_glob_type(), init_name, init_type);
+	set_entity_ld_ident(init_ent, init_name);
 
 	irg = new_ir_graph(ent, 0);
+	empty_frame_type = get_irg_frame_type(irg);
+	set_type_size_bytes(empty_frame_type, 0);
+
 	bb = get_cur_block();
 
-	call = new_r_Call( irg,
-			bb,							//ir_node *  	block,
-			get_irn_initial_mem(irg),	//ir_node *  	store,
-			ir_node *  	callee,
-			3,							//int  	arity,
-			ins,						//ir_node **  	in,
-			ir_type *  	tp
-			);
-
-	ret = new_r_Return ( irg,
-			bb,										//ir_node *  	block,
-			new_r_Proj(irg, bb, call, mode_M, 0),	//ir_node *  	store,
-			0,										//int  	arity,
-			NULL									//ir_node **  	in
-			);
+	start_block = get_irg_start_block(irg);
+
+	sym.entity_p = init_ent;
+	symconst     = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
 
+	sym.entity_p = ent_filename;
+	ins[0] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
+	sym.entity_p = bblock_id;
+	ins[1] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
+	sym.entity_p = bblock_counts;
+	ins[2] = new_r_SymConst(irg, start_block, sym, symconst_addr_ent);
+	ins[3] = new_r_Const_long(irg, start_block, mode_Iu, n_blocks);
+
+	call = new_r_Call(irg, bb, get_irg_initial_mem(irg), symconst, 4, ins, init_type);
+	ret = new_r_Return(irg, bb, new_r_Proj(irg, bb, call, mode_M, pn_Call_M_regular), 0, NULL);
 	mature_immBlock(bb);
 
 	add_immBlock_pred(get_irg_end_block(irg), ret);
 	mature_immBlock(get_irg_end_block(irg));
 
+	irg_finalize_cons(irg);
+
 	return irg;
 }
 
+/**
+ * Create the location data for the given debug info.
+ */
+static void create_location_data(dbg_info *dbg, block_id_walker_data_t *wd)
+{
+	unsigned lineno;
+	const char *fname = be_retrieve_dbg_info(dbg, &lineno);
+
+	if (fname) {
+		pmap_entry *entry = pmap_find(wd->fname_map, (void *)fname);
+		entity     *ent;
+
+		if (! entry) {
+			static unsigned nr = 0;
+			ident   *id;
+			char    buf[128];
+			ir_type *arr;
+			int     i, len = strlen(fname) + 1;
+			tarval  **tarval_string;
+
+			snprintf(buf, sizeof(buf), "firm_name_arr.%d", nr);
+			arr = new_type_array(new_id_from_str(buf), 1, wd->tp_char);
+			set_array_bounds_int(arr, 0, 0, len);
+
+			snprintf(buf, sizeof(buf), "__firm_name.%d", nr++);
+			id = new_id_from_str(buf);
+			ent = new_entity(get_glob_type(), id, arr);
+			set_entity_ld_ident(ent, id);
+
+			pmap_insert(wd->fname_map, (void *)fname, ent);
+
+			/* initialize file name string constant */
+			tarval_string = alloca(sizeof(*tarval_string) * (len));
+			for (i = 0; i < len; ++i) {
+				tarval_string[i] = new_tarval_from_long(fname[i], mode_Bs);
+			}
+			set_entity_variability(ent, variability_constant);
+			set_array_entity_values(ent, tarval_string, len);
+		} else {
+			ent = entry->value;
+		}
+		wd->locs[wd->id].fname  = ent;
+		wd->locs[wd->id].lineno = lineno;
+	} else {
+		wd->locs[wd->id].fname  = NULL;
+		wd->locs[wd->id].lineno = 0;
+	}
+}
+
+/**
+ * Walker: assigns an ID to every block.
+ * Builds the string table
+ */
 static void
 block_id_walker(ir_node * bb, void * data)
 {
-	block_id_walker_data *wd = data;
+	block_id_walker_data_t *wd = data;
 
-	*wd->array[wd->id] = new_tarval_from_long(get_irn_node_nr(bb), mode_Iu);
+	wd->array[wd->id] = new_tarval_from_long(get_irn_node_nr(bb), mode_Iu);
 	instrument_block(bb, wd->symconst, wd->id);
+
+	if (wd->flags & profile_with_locations) {
+		dbg_info *dbg = get_irn_dbg_info(bb);
+		create_location_data(dbg, wd);
+	}
 	++wd->id;
 }
 
-void
-be_profile_instrument(void)
+#define IDENT(x)	new_id_from_chars(x, sizeof(x) - 1)
+
+ir_graph *
+be_profile_instrument(const char *filename, unsigned flags)
 {
-	int            n, i;
-	unsigned int   n_blocks = 0;
-	ir_entity     *bblock_id, *bblock_counts, *bblock_count;
-	ir_type       *array_type, *integer_type;
-	tarval       **tarval_array;
+	int n, i;
+	unsigned int n_blocks = 0;
+	entity *bblock_id;
+	entity *bblock_counts;
+	entity *ent_filename;
+	entity *ent_locations = NULL;
+	entity *loc_lineno = NULL;
+	entity *loc_name = NULL;
+	entity *ent;
+	ir_type *array_type;
+	ir_type *uint_type;
+	ir_type *string_type;
+	ir_type *character_type;
+	ir_type *loc_type = NULL;
+	ir_type *charptr_type;
+	ir_type *gtp;
+	tarval **tarval_array;
+	tarval **tarval_string;
+	tarval *tv;
+	int filename_len = strlen(filename)+1;
+	ident *cur_ident;
+	int align_l, align_n, size;
+	ir_graph *rem;
+	block_id_walker_data_t  wd;
+	symconst_symbol sym;
+
+	/* count the number of block first */
+	for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
+		ir_graph *irg = get_irp_irg(n);
 
-	block_id_walker_data  wd;
-	symconst_symbol       sym;
+		n_blocks += count_blocks(irg);
+	}
 
-	integer_type = new_type_primitive(new_id_from_str("__uint"), mode_Iu);
-	array_type = new_type_array(new_id_from_str("__block_info_array"), 1, integer_type);
+	/* create all the necessary types and entities. Note that the
+	   types must have a fixed layout, because we already running in the
+	   backend */
+	uint_type      = new_type_primitive(IDENT("__uint"), mode_Iu);
+	set_type_alignment_bytes(uint_type, get_type_size_bytes(uint_type));
+	array_type     = new_type_array(IDENT("__block_info_array"), 1, uint_type);
 	set_array_bounds_int(array_type, 0, 0, n_blocks);
-	bblock_id = new_entity(get_glob_type(), new_id_from_str("__BLOCK_IDS"), array_type);
-	bblock_counts = new_entity(get_glob_type(), new_id_from_str("__BLOCK_COUNTS"), array_type);
-	bblock_count = new_entity(get_glob_type(), new_id_from_str("__N_BLOCKS"), integer_type);
 
-	for (n = get_irp_n_irgs()-1; n>=0; --n) {
-		ir_graph      *irg = get_irp_irg(n);
-
-		n_blocks += count_blocks(irg);
+	character_type = new_type_primitive(IDENT("__char"), mode_Bs);
+	string_type    = new_type_array(IDENT("__filename"), 1, character_type);
+	set_array_bounds_int(string_type, 0, 0, filename_len);
+
+	gtp            = get_glob_type();
+
+	cur_ident      = IDENT("__FIRMPROF__BLOCK_IDS");
+	bblock_id      = new_entity(gtp, cur_ident, array_type);
+	set_entity_ld_ident(bblock_id, cur_ident);
+	set_entity_variability(bblock_id, variability_initialized);
+
+	cur_ident      = IDENT("__FIRMPROF__BLOCK_COUNTS");
+	bblock_counts  = new_entity(gtp, cur_ident, array_type);
+	set_entity_ld_ident(bblock_counts, cur_ident);
+	set_entity_variability(bblock_counts, variability_initialized);
+
+	cur_ident      = IDENT("__FIRMPROF__FILE_NAME");
+	ent_filename   = new_entity(gtp, cur_ident, string_type);
+	set_entity_ld_ident(ent_filename, cur_ident);
+
+	if (flags & profile_with_locations) {
+		loc_type       = new_type_struct(IDENT("__location"));
+		loc_lineno     = new_entity(loc_type, IDENT("lineno"), uint_type);
+		align_l        = get_type_alignment_bytes(uint_type);
+		size           = get_type_size_bytes(uint_type);
+		set_entity_offset_bytes(loc_lineno, 0);
+
+		charptr_type   = new_type_pointer(IDENT("__charptr"), character_type, mode_P_data);
+		align_n        = get_type_size_bytes(charptr_type);
+		set_type_alignment_bytes(charptr_type, align_n);
+		loc_name       = new_entity(loc_type, IDENT("name"), charptr_type);
+		size           = (size + align_n - 1) & -align_n;
+		set_entity_offset_bytes(loc_name, size);
+		size          += align_n;
+
+		if (align_n > align_l)
+			align_l = align_n;
+		size = (size + align_l - 1) & -align_l;
+		set_type_size_bytes(loc_type, size);
+		set_type_state(loc_type, layout_fixed);
+
+		loc_type = new_type_array(IDENT("__locarray"), 1, loc_type);
+		set_array_bounds_int(string_type, 0, 0, n_blocks);
+
+		cur_ident      = IDENT("__FIRMPROF__LOCATIONS");
+		ent_locations   = new_entity(gtp, cur_ident, loc_type);
+		set_entity_ld_ident(ent_locations, cur_ident);
 	}
 
 	/* initialize count array */
-	tarval_array = alloca(sizeof(*null_array)*n_blocks);
-	for(i=0; i<n_blocks; ++i) {
-		null_array[i] = get_tarval_null(mode_Iu);
+	NEW_ARR_A(tarval *, tarval_array, n_blocks);
+	tv = get_tarval_null(mode_Iu);
+	for (i = 0; i < n_blocks; ++i) {
+		tarval_array[i] = tv;
 	}
-	set_array_entitiy_values(bblock_counts, tarval_array, n_blocks);
+	set_array_entity_values(bblock_counts, tarval_array, n_blocks);
 
-	/* initialize the block count entity */
-	set_atomic_ent_value(bblock_count, new_Const_long(mode_Iu, n_blocks));
-
-	/* generate a symbolic constant pointing to the count array */
-	sym.entity_p = bblock_count;
-	wd.symconst = new_SymConst(sym, symconst_addr_ent);
+	/* initialize function name string constant */
+	tarval_string = alloca(sizeof(*tarval_string) * (filename_len));
+	for (i = 0; i < filename_len; ++i) {
+		tarval_string[i] = new_tarval_from_long(filename[i], mode_Bs);
+	}
+	set_entity_variability(ent_filename, variability_constant);
+	set_array_entity_values(ent_filename, tarval_string, filename_len);
 
 	/* initialize block id array and instrument blocks */
-	wd.array = tarval_array;
-	wd.id = 0;
-	for (n = get_irp_n_irgs()-1; n>=0; --n) {
+	wd.array     = tarval_array;
+	wd.id        = 0;
+	wd.tp_char   = character_type;
+	wd.flags     = flags;
+	if (flags & profile_with_locations) {
+		wd.fname_map = pmap_create();
+		NEW_ARR_A(loc_entry, wd.locs, n_blocks);
+	}
+
+	for (n = get_irp_n_irgs() - 1; n >= 0; --n) {
 		ir_graph      *irg = get_irp_irg(n);
+		int            i;
+		ir_node       *endbb = get_irg_end_block(irg);
+		fix_env       env;
+
+		set_current_ir_graph(irg);
+
+		/* generate a symbolic constant pointing to the count array */
+		sym.entity_p = bblock_counts;
+		wd.symconst  = new_r_SymConst(irg, get_irg_start_block(irg), sym, symconst_addr_ent);
+
+		irg_block_walk_graph(irg, block_id_walker, NULL, &wd);
+		env.start_block = get_irg_start_block(irg);
+		env.end_block   = get_irg_end_block(irg);
+		set_irn_link(env.start_block, get_irg_no_mem(irg));
+		irg_block_walk_graph(irg, fix_ssa, NULL, &env);
+		for (i = get_Block_n_cfgpreds(endbb) - 1; i >= 0; --i) {
+			ir_node *node = skip_Proj(get_Block_cfgpred(endbb, i));
+			ir_node *bb   = get_Block_cfgpred_block(endbb, i);
+			ir_node *sync;
+			ir_node *ins[2];
+
+			switch (get_irn_opcode(node)) {
+			case iro_Return:
+				ins[0] = get_irn_link(bb);
+				ins[1] = get_Return_mem(node);
+				sync   = new_r_Sync(irg, bb, 2, ins);
+				set_Return_mem(node, sync);
+				break;
+			case iro_Raise:
+				ins[0] = get_irn_link(bb);
+				ins[1] = get_Raise_mem(node);
+				sync   = new_r_Sync(irg, bb, 2, ins);
+				set_Raise_mem(node, sync);
+				break;
+			default:
+				/* a fragile's op exception. There should be another path to End,
+				   so ignore it */
+				assert(is_fragile_op(node) && "unexpected End control flow predecessor");
+			}
+		}
+	}
+	set_array_entity_values(bblock_id, tarval_array, n_blocks);
+
+	if (flags & profile_with_locations) {
+		/* build the initializer for the locations */
+		rem = current_ir_graph;
+		current_ir_graph = get_const_code_irg();
+		ent = get_array_element_entity(loc_type);
+		set_entity_variability(ent_locations, variability_constant);
+		for (i = 0; i < n_blocks; ++i) {
+			compound_graph_path *path;
+			tarval *tv;
+			ir_node *n;
+
+			/* lineno */
+			path = new_compound_graph_path(loc_type, 2);
+			set_compound_graph_path_array_index(path, 0, i);
+			set_compound_graph_path_node(path, 0, ent);
+			set_compound_graph_path_node(path, 1, loc_lineno);
+			tv = new_tarval_from_long(wd.locs[i].lineno, mode_Iu);
+			add_compound_ent_value_w_path(ent_locations, new_Const(mode_Iu, tv), path);
+
+			/* name */
+			path = new_compound_graph_path(loc_type, 2);
+			set_compound_graph_path_array_index(path, 0, i);
+			set_compound_graph_path_node(path, 0, ent);
+			set_compound_graph_path_node(path, 1, loc_name);
+			if (wd.locs[i].fname) {
+				sym.entity_p = wd.locs[i].fname;
+				n = new_SymConst(sym, symconst_addr_ent);
+			} else {
+				n = new_Const(mode_P_data, get_mode_null(mode_P_data));
+			}
+			add_compound_ent_value_w_path(ent_locations, n, path);
+		}
+		pmap_destroy(wd.fname_map);
+	}
+	return gen_initializer_irg(ent_filename, bblock_id, bblock_counts, n_blocks);
+}
 
-		irg_block_walk_graph(irg, block_id_walker, null, &wd);
+static void
+profile_node_info(void *ctx, FILE *f, const ir_node *irn)
+{
+	if(is_Block(irn)) {
+		fprintf(f, "profiled execution count: %u\n", be_profile_get_block_execcount(irn));
 	}
-	set_array_entitiy_values(bblock_id, tarval_array, n_blocks);
+}
 
-	gen_initializer_irg(bblock_id, bblock_counts, bblock_count);
+static void
+register_vcg_hook(void)
+{
+	memset(&hook, 0, sizeof(hook));
+	hook.hook._hook_node_info = profile_node_info;
+	register_hook(hook_node_info, &hook);
 }
 
+static void
+unregister_vcg_hook(void)
+{
+	unregister_hook(hook_node_info, &hook);
+}
 
+/**
+ * Reads the corresponding profile info file if it exists and returns a
+ * profile info struct
+ */
 void
-be_profile_read(void)
+be_profile_read(const char *filename)
+{
+	FILE   *f;
+	char    buf[8];
+	size_t  ret;
+
+	f = fopen(filename, "r");
+	if(f == NULL) {
+		return;
+	}
+	printf("found profile data '%s'.\n", filename);
+
+	/* check magic */
+	ret = fread(buf, 8, 1, f);
+	if(ret == 0 || strncmp(buf, "firmprof", 8) != 0) {
+		return;
+	}
+
+	if(profile) be_profile_free();
+	profile = new_set(cmp_execcount, 16);
+
+	do {
+		execcount_t  query;
+		ret = fread(&query, sizeof(unsigned int), 2, f);
+
+		if(ret != 2) break;
+
+		set_insert(profile, &query, sizeof(query), query.block);
+	} while(1);
+
+	fclose(f);
+	register_vcg_hook();
+}
+
+/**
+ * Frees the profile info
+ */
+void
+be_profile_free(void)
+{
+	if(profile) {
+		unregister_vcg_hook();
+		del_set(profile);
+	}
+}
+
+/**
+ * Tells whether profile module has acquired data
+ */
+int
+be_profile_has_data(void)
 {
+	return (profile != NULL);
+}
+
+/**
+ * Get block execution count as determined be profiling
+ */
+unsigned int
+be_profile_get_block_execcount(const ir_node *block)
+{
+	execcount_t *ec, query;
+
+	if(!profile)
+		return 1;
+
+	query.block = get_irn_node_nr(block);
+	ec = set_find(profile, &query, sizeof(query), get_irn_node_nr(block));
+
+	if(ec != NULL) {
+		return ec->count;
+	} else {
+		ir_fprintf(stderr, "Warning: Profile contains no data for %+F\n",
+		           block);
+		return 1;
+	}
+}
+
+typedef struct _intialize_execfreq_env_t {
+	ir_graph *irg;
+	ir_exec_freq *execfreqs;
+	double freq_factor;
+} initialize_execfreq_env_t;
+
+// minimal execution frequency (an execfreq of 0 confuses algos)
+static const double MIN_EXECFREQ = 0.00001;
+
+static void initialize_execfreq(ir_node *block, void *data) {
+	initialize_execfreq_env_t *env = data;
+	double freq;
+
+	if(block == get_irg_start_block(env->irg)
+	   || block == get_irg_end_block(env->irg)) {
+		freq = 1.0;
+	} else {
+		freq = be_profile_get_block_execcount(block);
+		freq *= env->freq_factor;
+		if(freq < MIN_EXECFREQ)
+			freq = MIN_EXECFREQ;
+	}
+
+	set_execfreq(env->execfreqs, block, freq);
+}
+
+ir_exec_freq *be_create_execfreqs_from_profile(ir_graph *irg)
+{
+	ir_node *block2 = NULL;
+	ir_node *start_block;
+	const ir_edge_t *edge;
+	initialize_execfreq_env_t env;
+	unsigned count;
+
+	env.irg = irg;
+	env.execfreqs = create_execfreq(irg);
+
+	// find the successor to the start block
+	start_block = get_irg_start_block(irg);
+	foreach_block_succ(start_block, edge) {
+		ir_node *succ = get_edge_src_irn(edge);
+		if(succ != start_block) {
+			block2 = succ;
+			break;
+		}
+	}
+	assert(block2 != NULL);
+
+	count = be_profile_get_block_execcount(block2);
+	if(count == 0) {
+		// the function was never executed, so fallback to estimated freqs
+		free_execfreq(env.execfreqs);
+
+		return compute_execfreq(irg, 10);
+	}
+
+	env.freq_factor = 1.0 / count;
+	irg_block_walk_graph(irg, initialize_execfreq, NULL, &env);
 
+	return env.execfreqs;
 }