[PATCH] kallsyms data size reduction / lookup speedup

This patch is an improvement over my first kallsyms speedup patch posted about 2
weeks ago.

It changes scripts/kallsyms as to produce a different format for kallsyms_names
and extra data to speedup lookups. The compression algorithm is quite simple:
it uses all the char codes not actually used in symbols to build a lookup table
that translates these codes into small strings. For instance, in my test runs
the code 0xFE was being translated into "acpi_" giving a 4 byte save on every
translation.

The advantage of this algorithm is that to translate a symbol we only require
information that is stored on that symbol position, and never need to go back
on the compressed stream to get information from other symbols.

To give an idea about the benefits of this algorithm here are some benchmark
results on a P4 2.8GHz with a symbol table with 10000 entries:

kallsyms_lookup average time:
  vanilla           1346.0 us
  speedup             14.4 us
  with this patch      0.5 us

total data produced by scripts/kallsyms:
  uncompressed         169 Kb
  vanilla              134 Kb
  with this patch       91 Kb

(speedup was my latest patch, that only changed the way kallsyms_lookup worked
and not the data format)

I removed a cond_resched() from the proc/kallsyms handling code path, because
using stem compression, if the current position went backwards, the hole stream
would be uncompressed up to the current position. It seemed that by removing
this loop it would be safe to remove the conditional reschedule altogether.

There is just one catch with this patch: the time it takes to compile the kernel
goes up just a bit (about 0.8s on a P4 2.8GHz with defconfig). If this delay is
not acceptable I can change the compression algorithm so that it can use the
previous table (calculating a new table is what consumes most of the time, and
not doing the actual compression) and check to see if it obtains a similar
compression ratio. If it does, then this is a sign that the symbol patterns
haven't changed that much and this table is still good to use. This would not
only cut the time down to half on any compilation (because of the 2 pass symbol
build method), but in frequent cases where a developer is compiling a single
file and linking everything over and over again, the table optimization process
would never run.

I'm CC'ing Brent Casavant on this email, because last june he sent a patch
trying a different approach that used a 32 entry symbol cache, because there
was a problem with the time "top" took to read "proc/<pid>/wchan". I was
hopping he would be willing to test this patch and comment on the results.

As always, comments, suggestions, flames will be greatly appreciated :)



Signed-off-by: Paulo Marques <pmarques@xxxxxxxxxxxx>

diff -uprN -X dontdiff linux-2.6.9-rc1/kernel/kallsyms.c linux-2.6.9-rc1-kall/kernel/kallsyms.c
--- linux-2.6.9-rc1/kernel/kallsyms.c	2004-08-24 23:16:39.000000000 +0100
+++ linux-2.6.9-rc1-kall/kernel/kallsyms.c	2004-08-25 03:59:27.000000000 +0100
@@ -5,6 +5,12 @@
  * module loader:
  *   Copyright 2002 Rusty Russell <rusty@xxxxxxxxxxxxxxx> IBM Corporation
  * Stem compression by Andi Kleen.
+ *
+ * ChangeLog:
+ *
+ * (25/Aug/2004) Paulo Marques
+ *      Changed the compression method from stem compression to "table lookup"
+ *      compression
  */
 #include <linux/kallsyms.h>
 #include <linux/module.h>
@@ -17,7 +23,12 @@
 /* These will be re-linked against their real values during the second link stage */
 extern unsigned long kallsyms_addresses[] __attribute__((weak));
 extern unsigned long kallsyms_num_syms __attribute__((weak));
-extern char kallsyms_names[] __attribute__((weak));
+extern u8 kallsyms_names[] __attribute__((weak));
+
+extern u8 kallsyms_token_table[] __attribute__((weak));
+extern u16 kallsyms_token_index[] __attribute__((weak));
+
+extern unsigned long kallsyms_markers[] __attribute__((weak));
 
 /* Defined by the linker script. */
 extern char _stext[], _etext[], _sinittext[], _einittext[];
@@ -37,21 +48,56 @@ static inline int is_kernel_text(unsigne
 	return 0;
 }
 
+static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
+{
+	int len, tlen;
+	u8 *tptr, *data;
+
+	data = &kallsyms_names[off];
+	
+	len=*data++;
+	off += len + 1;
+	while(len) {
+		tptr=&kallsyms_token_table[kallsyms_token_index[*data]];
+		data++;
+		len--;
+
+		tlen=*tptr++;
+		while(tlen) {
+			*result++=*tptr++;
+			tlen--;
+		}
+	}
+
+	*result = 0;
+
+	return off;
+}
+
+static unsigned int get_symbol_offset(unsigned long pos)
+{
+	u8 *name;
+	int i;
+
+	name = &kallsyms_names[ kallsyms_markers[pos>>8] ];
+	for(i = 0; i < (pos&0xFF); i++)
+		name = name + (*name) + 1;
+
+	return name - kallsyms_names;
+}
+
 /* Lookup the address for this symbol. Returns 0 if not found. */
 unsigned long kallsyms_lookup_name(const char *name)
 {
 	char namebuf[KSYM_NAME_LEN+1];
 	unsigned long i;
-	char *knames;
+	unsigned int off;
 
-	for (i = 0, knames = kallsyms_names; i < kallsyms_num_syms; i++) {
-		unsigned prefix = *knames++;
+	for (i = 0, off = 0; i < kallsyms_num_syms; i++) {
+		off = kallsyms_expand_symbol(off, namebuf);
 
-		strlcpy(namebuf + prefix, knames, KSYM_NAME_LEN - prefix);
 		if (strcmp(namebuf, name) == 0)
 			return kallsyms_addresses[i];
-
-		knames += strlen(knames) + 1;
 	}
 	return module_kallsyms_lookup_name(name);
 }
@@ -62,7 +108,7 @@ const char *kallsyms_lookup(unsigned lon
 			    unsigned long *offset,
 			    char **modname, char *namebuf)
 {
-	unsigned long i, best = 0;
+	unsigned long i, low, high, mid;
 
 	/* This kernel should never had been booted. */
 	BUG_ON(!kallsyms_addresses);
@@ -71,40 +117,41 @@ const char *kallsyms_lookup(unsigned lon
 	namebuf[0] = 0;
 
 	if (is_kernel_text(addr) || is_kernel_inittext(addr)) {
-		unsigned long symbol_end;
-		char *name = kallsyms_names;
+		unsigned long symbol_end=0;
 
-		/* They're sorted, we could be clever here, but who cares? */
-		for (i = 0; i < kallsyms_num_syms; i++) {
-			if (kallsyms_addresses[i] > kallsyms_addresses[best] &&
-			    kallsyms_addresses[i] <= addr)
-				best = i;
+		/* do a binary search on the sorted kallsyms_addresses array */
+		low = 0;
+		high = kallsyms_num_syms;
+		while (high-low > 1) {
+			mid = (low + high) / 2;
+			if (kallsyms_addresses[mid] <= addr) low = mid;
+			else high = mid;
 		}
+		while (low && kallsyms_addresses[low-1] == kallsyms_addresses[low]) 
+			--low;
 
 		/* Grab name */
-		for (i = 0; i <= best; i++) { 
-			unsigned prefix = *name++;
-			strncpy(namebuf + prefix, name, KSYM_NAME_LEN - prefix);
-			name += strlen(name) + 1;
-		}
-
-		/* At worst, symbol ends at end of section. */
-		if (is_kernel_inittext(addr))
-			symbol_end = (unsigned long)_einittext;
-		else
-			symbol_end = (unsigned long)_etext;
+		kallsyms_expand_symbol(get_symbol_offset(low), namebuf);
 
 		/* Search for next non-aliased symbol */
-		for (i = best+1; i < kallsyms_num_syms; i++) {
-			if (kallsyms_addresses[i] > kallsyms_addresses[best]) {
+		for (i = low + 1; i < kallsyms_num_syms; i++) {
+			if (kallsyms_addresses[i] > kallsyms_addresses[low]) {
 				symbol_end = kallsyms_addresses[i];
 				break;
 			}
 		}
 
-		*symbolsize = symbol_end - kallsyms_addresses[best];
+		if (!symbol_end) {
+			/* At worst, symbol ends at end of section. */
+			if (is_kernel_inittext(addr))
+				symbol_end = (unsigned long)_einittext;
+			else
+				symbol_end = (unsigned long)_etext;
+		}
+
+		*symbolsize = symbol_end - kallsyms_addresses[low];
 		*modname = NULL;
-		*offset = addr - kallsyms_addresses[best];
+		*offset = addr - kallsyms_addresses[low];
 		return namebuf;
 	}
 
@@ -168,15 +215,10 @@ static int get_ksymbol_mod(struct kallsy
 /* Returns space to next name. */
 static unsigned long get_ksymbol_core(struct kallsym_iter *iter)
 {
-	unsigned stemlen, off = iter->nameoff;
+	unsigned off = iter->nameoff;
+
+	off = kallsyms_expand_symbol(off, iter->name);
 
-	/* First char of each symbol name indicates prefix length
-	   shared with previous name (stem compression). */
-	stemlen = kallsyms_names[off++];
-
-	strlcpy(iter->name+stemlen, kallsyms_names + off,
-		KSYM_NAME_LEN+1-stemlen);
-	off += strlen(kallsyms_names + off) + 1;
 	iter->owner = NULL;
 	iter->value = kallsyms_addresses[iter->pos];
 	if (is_kernel_text(iter->value) || is_kernel_inittext(iter->value))
@@ -188,11 +230,11 @@ static unsigned long get_ksymbol_core(st
 	return off - iter->nameoff;
 }
 
-static void reset_iter(struct kallsym_iter *iter)
+static void reset_iter(struct kallsym_iter *iter, loff_t new_pos)
 {
 	iter->name[0] = '\0';
-	iter->nameoff = 0;
-	iter->pos = 0;
+	iter->nameoff = get_symbol_offset(new_pos);
+	iter->pos = new_pos;
 }
 
 /* Returns false if pos at or past end of file. */
@@ -204,16 +246,13 @@ static int update_iter(struct kallsym_it
 		return get_ksymbol_mod(iter);
 	}
 	
-	/* If we're past the desired position, reset to start. */
-	if (pos < iter->pos)
-		reset_iter(iter);
-
-	/* We need to iterate through the previous symbols: can be slow */
-	for (; iter->pos != pos; iter->pos++) {
-		iter->nameoff += get_ksymbol_core(iter);
-		cond_resched();
-	}
-	get_ksymbol_core(iter);
+	/* If we're not on the desired position, reset to new position. */
+	if (pos != iter->pos)
+		reset_iter(iter, pos);
+
+	iter->nameoff += get_ksymbol_core(iter);
+	iter->pos++;
+
 	return 1;
 }
 
@@ -274,7 +313,7 @@ static int kallsyms_open(struct inode *i
 	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
 	if (!iter)
 		return -ENOMEM;
-	reset_iter(iter);
+	reset_iter(iter, 0);
 
 	ret = seq_open(file, &kallsyms_op);
 	if (ret == 0)
diff -uprN -X dontdiff linux-2.6.9-rc1/scripts/kallsyms.c linux-2.6.9-rc1-kall/scripts/kallsyms.c
--- linux-2.6.9-rc1/scripts/kallsyms.c	2004-08-24 23:16:39.000000000 +0100
+++ linux-2.6.9-rc1-kall/scripts/kallsyms.c	2004-08-25 03:30:30.000000000 +0100
@@ -6,6 +6,13 @@
  * of the GNU General Public License, incorporated herein by reference.
  *
  * Usage: nm -n vmlinux | scripts/kallsyms [--all-symbols] > symbols.S
+ *
+ * ChangeLog:
+ *
+ * (25/Aug/2004) Paulo Marques
+ *      Changed the compression method from stem compression to "table lookup"
+ *      compression
+ *
  */
 
 #include <stdio.h>
@@ -13,10 +20,30 @@
 #include <string.h>
 #include <ctype.h>
 
+/* compression tunning settings */
+#define MAX_TOK_SIZE		11
+#define KSYM_NAME_LEN		127
+
+/* we use only a subset of the complete symbol table to gather the token count,
+   to speed up compression, at the expense of a little compression ratio
+*/
+#define WORKING_SET		1024
+#define GOOD_BAD_THRESHOLD	10
+
+#define HASH_BITS		18
+#define HASH_TABLE_SIZE		(1 << HASH_BITS)
+#define HASH_MASK		(HASH_TABLE_SIZE - 1)
+#define HASH_BASE_OFFSET	2166136261U
+#define HASH_FOLD(a)		((a)&(HASH_MASK))
+
+
 struct sym_entry {
 	unsigned long long addr;
 	char type;
-	char *sym;
+	char sample;
+	char valid;
+	unsigned char len;
+	unsigned char *sym;
 };
 
 
@@ -25,6 +52,24 @@ static int size, cnt;
 static unsigned long long _stext, _etext, _sinittext, _einittext;
 static int all_symbols = 0;
 
+
+struct token { 
+	unsigned char data[MAX_TOK_SIZE];
+	unsigned char len;
+	int profit;
+	struct token *next;
+	struct token *right;
+	struct token *left;
+	struct token *smaller;
+	};
+
+struct token bad_head, good_head;
+struct token *hash_table[HASH_TABLE_SIZE];
+
+unsigned char best_table[256][MAX_TOK_SIZE+1];
+unsigned char best_table_len[256];
+
+
 static void
 usage(void)
 {
@@ -60,6 +105,7 @@ read_symbol(FILE *in, struct sym_entry *
 		return -1;
 
 	s->sym = strdup(str);
+	s->len = strlen(str);
 	return 0;
 }
 
@@ -108,11 +154,42 @@ read_map(FILE *in)
 	}
 }
 
+static void output_label(char *label)
+{
+	printf(".globl %s\n",label);
+	printf("\tALGN\n");
+	printf("%s:\n",label);
+}
+
+static int expand_symbol(unsigned char *data, int len, char *result)
+{
+	int c, rlen, total=0;
+
+	while (len) {
+		c = *data;
+		if (best_table[c][0]==c && best_table_len[c]==1) {
+			*result++ = c;
+			total++;
+		} else { 
+			rlen = expand_symbol(best_table[c], best_table_len[c], result);
+			total += rlen;
+			result += rlen;
+		}
+		data++;
+		len--;
+	}
+	*result=0;
+
+	return total;
+}
+
 static void
 write_src(void)
 {
-	int i, valid = 0;
-	char *prev;
+	int i, k, off, valid;
+	unsigned int best_idx[256];
+	unsigned int *markers;
+	char buf[KSYM_NAME_LEN+1];
 
 	printf("#include <asm/types.h>\n");
 	printf("#if BITS_PER_LONG == 64\n");
@@ -125,43 +202,349 @@ write_src(void)
 
 	printf(".data\n");
 
-	printf(".globl kallsyms_addresses\n");
-	printf("\tALGN\n");
-	printf("kallsyms_addresses:\n");
+	output_label("kallsyms_addresses");
+	valid = 0;
 	for (i = 0; i < cnt; i++) {
-		if (!symbol_valid(&table[i]))
-			continue;
-
-		printf("\tPTR\t%#llx\n", table[i].addr);
-		valid++;
+		if (table[i].valid) {
+			printf("\tPTR\t%#llx\n", table[i].addr);
+			valid++;
+		}
 	}
 	printf("\n");
 
-	printf(".globl kallsyms_num_syms\n");
-	printf("\tALGN\n");
-	printf("kallsyms_num_syms:\n");
+	output_label("kallsyms_num_syms");
 	printf("\tPTR\t%d\n", valid);
 	printf("\n");
 
-	printf(".globl kallsyms_names\n");
-	printf("\tALGN\n");
-	printf("kallsyms_names:\n");
-	prev = ""; 
+	markers = (unsigned int *) malloc(sizeof(unsigned int)*((valid + 255) / 256));
+	
+	output_label("kallsyms_names");
+	valid = 0;
+	off = 0;
 	for (i = 0; i < cnt; i++) {
-		int k;
 
-		if (!symbol_valid(&table[i]))
+		if (!table[i].valid)
 			continue;
 
-		for (k = 0; table[i].sym[k] && table[i].sym[k] == prev[k]; ++k)
-			; 
+		if ((valid & 0xFF) == 0)
+			markers[valid >> 8] = off;
+
+		printf("\t.byte 0x%02x", table[i].len);
+		for (k = 0; k < table[i].len; k++)
+			printf(", 0x%02x", table[i].sym[k]);
+		printf("\n");
 
-		printf("\t.byte 0x%02x\n\t.asciz\t\"%s\"\n", k, table[i].sym + k);
-		prev = table[i].sym;
+		off += table[i].len + 1;
+		valid++;
 	}
 	printf("\n");
+
+	output_label("kallsyms_markers");
+	for (i = 0; i < ((valid + 255) >> 8); i++)
+		printf("\tPTR\t%d\n", markers[i]);
+	printf("\n");
+
+	output_label("kallsyms_token_table");
+	off = 0;
+	for (i = 0; i < 256; i++) {
+		best_idx[i] = off;
+		expand_symbol(best_table[i],best_table_len[i],buf);
+		k = strlen(buf);
+		printf("\t.byte 0x%02x\n\t.ascii\t\"%s\"\n", k, buf);
+		off += k + 1;
+	}
+	printf("\n");
+
+	output_label("kallsyms_token_index");
+	for (i = 0; i < 256; i++)
+		printf("\t.word\t%d\n", best_idx[i]);
+	printf("\n");
+}
+
+
+/* table lookup compression functions */
+
+static inline unsigned int rehash_token(unsigned int hash, unsigned char data)
+{
+	return ((hash * 16777619) ^ data);
+}
+
+static unsigned int hash_token(unsigned char *data, int len)
+{
+	unsigned int hash=HASH_BASE_OFFSET;
+	int i;
+
+	for (i = 0; i < len; i++)
+		hash = rehash_token(hash, data[i]);
+
+	return HASH_FOLD(hash);
+}
+
+static struct token *find_token_hash(unsigned char *data, int len, unsigned int hash)
+{
+	struct token *ptr;
+
+	ptr = hash_table[hash];
+
+	while (ptr) {
+		if ((ptr->len == len) && (memcmp(ptr->data, data, len) == 0))
+			return ptr;
+		ptr=ptr->next;
+	}
+
+	return NULL;
 }
 
+static inline void insert_token_in_group(struct token *head, struct token *ptr)
+{
+	ptr->right = head->right;
+	ptr->right->left = ptr;
+	head->right = ptr;
+	ptr->left = head;
+}
+
+static inline void remove_token_from_group(struct token *ptr)
+{
+	ptr->left->right = ptr->right;
+	ptr->right->left = ptr->left;
+}
+
+static void learn_token(unsigned char *data, int len)
+{
+	struct token *ptr,*last_ptr;
+	int i, newprofit;
+	unsigned int hash = HASH_BASE_OFFSET;
+	unsigned int hashes[MAX_TOK_SIZE + 1];
+
+	if (len > MAX_TOK_SIZE) 
+		len = MAX_TOK_SIZE;
+
+	hash = rehash_token(hash, data[0]);
+	for (i = 2; i <= len; i++) {
+		hash = rehash_token(hash, data[i-1]);
+		hashes[i] = HASH_FOLD(hash);
+	}
+
+	last_ptr = NULL;
+	ptr = NULL;
+
+	for (i = len; i >= 2; i--) {
+		hash = hashes[i];
+
+		if (!ptr) ptr = find_token_hash(data, i, hash);
+
+		if (!ptr) {
+			ptr = (struct token *) malloc(sizeof(*ptr));
+			memcpy(ptr->data, data, i);
+			ptr->len = i;
+			ptr->profit = -GOOD_BAD_THRESHOLD;
+			ptr->next = hash_table[hash];
+			hash_table[hash] = ptr;
+
+			insert_token_in_group(&bad_head, ptr);
+
+			ptr->smaller = NULL;
+		} else {
+			newprofit = ptr->profit + (ptr->len - 1);
+			if((ptr->profit < 0) && (newprofit >= 0)) {
+				remove_token_from_group(ptr);
+				insert_token_in_group(&good_head,ptr);
+			}
+		ptr->profit = newprofit;
+		}
+
+		if (last_ptr) last_ptr->smaller = ptr;
+		last_ptr = ptr;
+
+		ptr = ptr->smaller;
+	}
+}
+
+static void forget_token(unsigned char *data, int len)
+{
+	struct token *ptr;
+	int i, newprofit;
+	unsigned int hash=0;
+
+	if (len > MAX_TOK_SIZE) len = MAX_TOK_SIZE;
+
+	hash = hash_token(data, len);
+	ptr = find_token_hash(data, len, hash);
+
+	for (i = len; i >= 2; i--) {
+
+		newprofit = ptr->profit - (ptr->len - 1);
+		if ((ptr->profit >= 0) && (newprofit < 0)) {
+			remove_token_from_group(ptr);
+			insert_token_in_group(&bad_head, ptr);
+		}
+		ptr->profit=newprofit;
+
+		ptr=ptr->smaller;
+	}
+}
+
+static void learn_symbol(unsigned char *symbol, int len)
+{
+	int i;
+
+	for (i = 0; i < len - 1; i++)
+		learn_token(symbol + i, len - i);
+}
+
+static void forget_symbol(unsigned char *symbol, int len)
+{
+	int i;
+
+	for (i = 0; i < len - 1; i++)
+		forget_token(symbol + i, len - i);
+}
+
+static void build_initial_tok_table(void)
+{
+	int i, use_it, valid;
+
+	valid = 0;
+	for (i = 0; i < cnt; i++) {
+		table[i].valid = symbol_valid(&table[i]);
+		if (table[i].valid) valid++;
+	}
+
+	use_it = 0;
+	for (i = 0; i < cnt; i++) {
+		table[i].sample = 0;
+		if (table[i].valid) {
+			use_it += WORKING_SET;
+			if (use_it >= valid) {
+				table[i].sample = 1;
+				use_it -= valid;
+			}
+		}
+		if (table[i].sample)
+			learn_symbol(table[i].sym, table[i].len);
+	}
+}
+
+static void compress_symbols(unsigned char *str, int tlen, int idx)
+{
+	int i, len, learn, size;
+	unsigned char *p;
+
+	for (i = 0; i < cnt; i++) {
+		if (!table[i].valid) continue;
+		
+		len = table[i].len;
+		learn = 0;
+		p = table[i].sym;
+
+		do {
+			p = (unsigned char *) strstr((char *) p, (char *) str);
+			if (!p) break;
+
+			if (!learn) {
+				if (table[i].sample) 
+					forget_symbol(table[i].sym, len);
+				learn = 1;
+			}
+
+			*p = idx;
+			size = (len - (p - table[i].sym)) - tlen + 1;
+			memmove(p + 1, p + tlen, size);
+			p++;
+			len -= tlen - 1;
+			
+		} while (size >= tlen);
+
+		if(learn) {
+			table[i].len = len;
+			if(table[i].sample) learn_symbol(table[i].sym, len);
+		}
+	}
+}
+
+static struct token *find_best_token(void)
+{
+	struct token *ptr,*best,*head;
+	int bestprofit;
+
+	bestprofit=-10000;
+ 
+	/* failsafe: if the "good" list is empty search from the "bad" list */
+	if(good_head.right == &good_head) head = &bad_head;
+	else head = &good_head;
+
+	ptr = head->right;
+	best = NULL;
+	while (ptr != head) { 
+		if (ptr->profit > bestprofit) {
+			bestprofit = ptr->profit;
+			best = ptr;
+		}
+		ptr = ptr->right;
+	}
+
+	return best;
+}
+
+static void optimize_result(void)
+{
+	struct token *best;
+	int i;
+
+	/* using the '\0' symbol last allows compress_symbols to use standard
+	   fast string functions
+	*/
+	for (i = 255; i >= 0; i--) {
+		if (!best_table_len[i]) {
+			best = find_best_token();
+
+			best_table_len[i] = best->len;
+			memcpy(best_table[i], best->data, best_table_len[i]);
+			/* zero terminate the token so that we can use strstr
+			   in compress_symbols */
+			best_table[i][best_table_len[i]]='\0';
+
+			compress_symbols(best_table[i], best_table_len[i], i);
+		}
+	}
+}
+
+static void insert_real_symbols_in_table(void)
+{
+	int i, j, c;
+
+	memset(best_table, 0, sizeof(best_table));
+	memset(best_table_len, 0, sizeof(best_table_len));
+
+	for (i = 0; i < cnt; i++) {
+		if (table[i].valid) {
+			for (j = 0; j < table[i].len; j++) {
+				c = table[i].sym[j];
+				best_table[c][0]=c;
+				best_table_len[c]=1;
+			}
+		}
+	}
+}
+
+static void optimize_token_table(void)
+{
+	memset(hash_table, 0, sizeof(hash_table));
+
+	good_head.left = &good_head;
+	good_head.right = &good_head;
+
+	bad_head.left = &bad_head;
+	bad_head.right = &bad_head;
+
+	build_initial_tok_table();
+
+	insert_real_symbols_in_table();
+
+	optimize_result();
+}
+
+
 int
 main(int argc, char **argv)
 {
@@ -171,6 +554,7 @@ main(int argc, char **argv)
 		usage();
 
 	read_map(stdin);
+	optimize_token_table();
 	write_src();
 
 	return 0;