Initial commit of OpenSPARC T2 design and verification files.

[OpenSPARC-T2-DV] / verif / env / fnx / clib / report / cc / Hash.cc

// ========== Copyright Header Begin ==========================================
// 
// OpenSPARC T2 Processor File: Hash.cc
// Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved
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// it under the terms of the GNU General Public License as published by
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// GNU General Public License for more details.
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// along with this program; if not, write to the Free Software
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#include <stdio.h>
#include <string.h>
#include "cReport.h"
#include "Hash.h"

  
// HashTable::insert
//	  
// Inserts an item into the hash.
//
void
HashTable::insert(HashValueListNode *node) {
  unsigned long hash = node->Hash() % _HASH_SIZE;
  HashValueListNode *table_node = valueNodes[hash];

  while (table_node != NULL) {
    // is this a duplicate?
    if (0 == strcmp(table_node->mip_name, node->mip_name)) {
      // done.  entry already exists
      return;
    } else {
      table_node = table_node->next;
    }
  }

  //fprintf(stderr, "inserting: %s\n", node->mip_name);

  // This is a new entry.  Prepend to the bucket.
  table_node = valueNodes[hash];
  valueNodes[hash] = node;
  valueNodes[hash]->next = table_node;
  valueNodes[hash]->next_overall = most_recent_inserted;
  most_recent_inserted = valueNodes[hash];

} // HashTable::insert()


// HashTable::lookup()
//
// Return a pointer to the value hashed to by key node.
//
const HashValueListNode*
HashTable::lookup(const HashValueListNode& node) {
  unsigned long hash = node.Hash() % _HASH_SIZE;
  HashValueListNode *table_node = valueNodes[hash];

  while (table_node != NULL) {
    // search the bucket
    if (0 == strcmp(table_node->mip_name, node.mip_name)) {
      // match.
      break;
    } else {
      table_node = table_node->next;
    }
  }
  return table_node;
}


// HashTable::next_element
//
// Returns the `next' element from the hash.  Call start_walk() to start at
// the beginning.
//
// NOTE! The order of elements returned by this function is essentially
// arbitrary.  This is sufficient for traversing the table, but not much
// else.
//
const HashValueListNode*
HashTable::next_element() {
  HashValueListNode* table_node = next_walk;
  if (table_node != NULL) {
    next_walk = table_node->next_overall;
  }
  return table_node;
}