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/* Copyright (C) 1999 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
#include <stdio.h>
#include <stdlib.h>
#include "make-trie.h"
typedef struct trie_node
{
int key;
int level;
int position;
union
{
int value;
struct trie_node *node;
} u[16];
} trie_node;
trie_node *
make_node ()
{
trie_node *node = (trie_node *) malloc (sizeof(trie_node));
if (node == NULL)
abort();
return node;
}
trie_node *
make_leaf_node ()
{
trie_node *node = make_node ();
int i = 16;
while (--i >= 0)
node->u[i].value = -1;
return node;
}
trie_node *
make_branch_node ()
{
trie_node *node = make_node ();
int i = 16;
while (--i >= 0)
node->u[i].node = NULL;
return node;
}
trie_node *table = NULL;
void
enter (int key, int value)
{
trie_node **ptr = &table;
int shift = 12;
for (; shift > 0; shift -= 4)
{
if (*ptr == NULL)
{
*ptr = make_branch_node ();
(*ptr)->key = key & (0xFFFF << (shift + 4));
(*ptr)->level = shift / 4;
}
ptr = &(*ptr)->u[(key >> shift) & 0xF].node;
}
if (*ptr == NULL)
{
*ptr = make_leaf_node ();
(*ptr)->key = key & 0xFFF0;
(*ptr)->level = 0;
}
if ((*ptr)->u[key & 0xF].value != -1
&& (*ptr)->u[key & 0xF].value != value)
fprintf(stderr, "duplicate value for key: %d, %d!\n", key, value);
(*ptr)->u[key & 0xF].value = value;
}
int assigned = 0;
void
assign (trie_node *node, int level)
{
int i;
if (node == NULL)
return;
if (node->level != level)
abort();
node->position = assigned;
assigned++;
if (level == 0)
return;
for (i = 0; i < 16; i++)
{
assign (node->u[i].node, level-1);
}
}
int next_node_index_toprint = 0;
void
print (trie_node *node, int index, int level, FILE *out)
{
int i;
if (node->key != index || node->level != level)
abort();
if (level == 0) /* leaf node */
{
for (i = 0; i < 16; i++)
{
int node_index = index | (i << (level * 4));
if (node_index < next_node_index_toprint)
abort();
if (node->u[i].value == -1)
fprintf (out, " /* key: 0x%x */ 0xffff,\n", node_index);
else
fprintf (out, " /* key: 0x%x */ 0x%x,\n",
node_index, node->u[i].value);
next_node_index_toprint = node_index + 1;
}
}
else
{
for (i = 0; i < 16; i++)
{
int node_index = index | (i << (level * 4));
fprintf (out, " /* branch: 0x%0*x%.*s */ ",
4 - level, node_index >> ( 4 * level),
level, "XXXX");
if (node->u[i].node == NULL)
fprintf (out, "0,\n");
else
fprintf (out, "%d,\n", 16 * node->u[i].node->position);
}
for (i = 0; i < 16; i++)
{
int node_index = index | (i << (level * 4));
if (node->u[i].node != NULL)
print (node->u[i].node, node_index, level-1, out);
}
}
}
void
print_table (char *name, FILE *out)
{
assign (table, 3);
fprintf(out, "/* This file is automatically generated. */\n");
fprintf(out, "unsigned short %s[] = {\n", name);
print (table, 0x0000, 3, out);
fprintf(out, "};\n");
}
#if 0
int
main (int argc, char **argv)
{
int count = 0;
for (;;)
{
int key, value;
int i = scanf (" 0x%x 0x%x", &key, &value);
if (i < 2)
break;
count++;
enter (key, value);
}
return 0;
}
#endif
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