Skip to content
This repository
tag: v0_9_6
Fetching contributors…

Cannot retrieve contributors at this time

file 164 lines (140 sloc) 4.814 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164
/*
* Copyright (c) 2008 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/

# include "config.h"

# include <iostream>

# include <typeinfo>
# include <cstdlib>
# include "compiler.h"
# include "netlist.h"
# include "netmisc.h"
# include "ivl_target_priv.h"
# include "ivl_assert.h"

static bool has_enable(ivl_switch_type_t tt)
{
      switch (tt) {
case IVL_SW_TRANIF0:
case IVL_SW_TRANIF1:
case IVL_SW_RTRANIF0:
case IVL_SW_RTRANIF1:
return true;
default:
return false;
      }
}

NetTran::NetTran(NetScope*scope__, perm_string n, ivl_switch_type_t tt)
: NetNode(scope__, n, has_enable(tt)? 3 : 2), type_(tt)
{
      pin(0).set_dir(Link::PASSIVE);
      pin(1).set_dir(Link::PASSIVE);
      if (pin_count() == 3) {
pin(2).set_dir(Link::INPUT); // Enable
      }
}

NetTran::NetTran(NetScope*scope__, perm_string n, unsigned wid, unsigned part, unsigned off)
: NetNode(scope__, n, 2), type_(IVL_SW_TRAN_VP), wid_(wid), part_(part), off_(off)
{
      pin(0).set_dir(Link::PASSIVE);
      pin(1).set_dir(Link::PASSIVE);
}

NetTran::~NetTran()
{
}

unsigned NetTran::vector_width() const
{
      return wid_;
}

unsigned NetTran::part_width() const
{
      return part_;
}

unsigned NetTran::part_offset() const
{
      return off_;
}

void join_island(NetPins*obj)
{
      IslandBranch*branch = dynamic_cast<IslandBranch*> (obj);

// If this is not even a branch, then stop now.
      if (branch == 0)
return;

// If this is a branch, but already given to an island, then
// stop.
      if (branch->island_)
return;

      list<NetObj*> uncommitted_neighbors;

// Look for neighboring objects that might already be in
// islands. If we find something, then join that island.
      for (unsigned idx = 0 ; idx < obj->pin_count() ; idx += 1) {
Nexus*nex = obj->pin(idx).nexus();
for (Link*cur = nex->first_nlink() ; cur ; cur = cur->next_nlink()) {
unsigned pin;
NetPins*tmp_pins;
cur->cur_link(tmp_pins, pin);

NetObj*tmp = dynamic_cast<NetObj*> (tmp_pins);
if (tmp == 0)
continue;

// Skip self.
if (tmp == obj)
continue;

// If tmp is not a branch, then skip it.
IslandBranch*tmp_branch = dynamic_cast<IslandBranch*> (tmp);
if (tmp_branch == 0)
continue;

// If tmp is an uncommitted branch, then save
// it. When I finally choose an island for self,
// these branches will be scanned so that they join
// this island as well.
if (tmp_branch->island_ == 0) {
uncommitted_neighbors.push_back(tmp);
continue;
}

ivl_assert(*obj, branch->island_==0 || branch->island_==tmp_branch->island_);

// We found an existing island to join. Join it
// now. Keep scanning in order to find more neighbors.
if (branch->island_ == 0) {
if (debug_elaborate)
cerr << obj->get_fileline() << ": debug: "
<< "Join branch to existing island." << endl;
branch->island_ = tmp_branch->island_;
ivl_assert(*obj, branch->island_->discipline == tmp_branch->island_->discipline);

} else if (branch->island_ != tmp_branch->island_) {
cerr << obj->get_fileline() << ": internal error: "
<< "Oops, Found 2 neighboring islands." << endl;
ivl_assert(*obj, 0);
}
}
      }

// If after all that we did not find an island to join, then
// start the island not and join it.
      if (branch->island_ == 0) {
branch->island_ = new ivl_island_s;
branch->island_->discipline = branch->discipline_;
if (debug_elaborate)
cerr << obj->get_fileline() << ": debug: "
<< "Create new island for this branch" << endl;
      }

// Now scan all the uncommitted neighbors I found. Calling
// join_island() on them will cause them to notice me in the
// process, and thus they will join my island. This process
// will recurse until all the connected branches join this island.
      for (list<NetObj*>::iterator cur = uncommitted_neighbors.begin()
; cur != uncommitted_neighbors.end() ; cur ++ ) {
join_island(*cur);
      }
}
Something went wrong with that request. Please try again.