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/*
* Copyright (c) 2000Stephen 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
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: net_design.cc,v 1.14 2000/08/12 17:59:48 steve Exp $"
#endif

/*
* This source file contains all the implementations of the Design
* class declared in netlist.h.
*/

# include "netlist.h"
# include "util.h"
# include <strstream>

static string parse_last_name(string&path)
{
      unsigned pos = path.rfind('.');
      if (pos > path.length()) {
string res = path;
path = "";
return res;
      }

      string res = path.substr(pos+1, path.length());
      path = path.substr(0, pos);
      return res;
}

Design:: Design()
: errors(0), root_scope_(0), nodes_(0), procs_(0), lcounter_(0)
{
      procs_idx_ = 0;
      des_precision_ = 0;
}

Design::~Design()
{
}

string Design::local_symbol(const string&path)
{
      strstream res;
      res << "_L" << (lcounter_++) << ends;

      return path + "." + res.str();
}

void Design::set_precision(int val)
{
      if (val < des_precision_)
des_precision_ = val;
}

int Design::get_precision() const
{
      return des_precision_;
}

unsigned long Design::scale_to_precision(unsigned long val,
const NetScope*scope) const
{
      int units = scope->time_unit();
      assert( units >= des_precision_ );

      while (units > des_precision_) {
units -= 1;
val *= 10;
      }

      return val;
}

NetScope* Design::make_root_scope(const string&root)
{
      assert(root_scope_ == 0);
      root_scope_ = new NetScope(root);
      return root_scope_;
}

NetScope* Design::find_root_scope()
{
      assert(root_scope_);
      return root_scope_;
}

/*
* This method locates a scope in the design, given its rooted
* heirarchical name. Each component of the key is used to scan one
* more step down the tree until the name runs out or the search
* fails.
*/
NetScope* Design::find_scope(const string&key) const
{
      if (key == root_scope_->name())
return root_scope_;

      string path = key;
      string root = parse_first_name(path);

      NetScope*cur = root_scope_;
      if (root != cur->name())
return 0;

      while (cur) {
string next = parse_first_name(path);
cur = cur->child(next);
if (path == "") return cur;
      }

      return cur;
}

/*
* This is a relative lookup of a scope by name. The starting point is
* the scope parameter is the place within which I start looking for
* the scope. If I do not find the scope within the passed scope,
* start looking in parent scopes until I find it, or I run out of
* parent scopes.
*/
NetScope* Design::find_scope(NetScope*scope, const string&name) const
{
      assert(scope);

      for ( ; scope ; scope = scope->parent()) {
string path = name;
string key = parse_first_name(path);

NetScope*cur = scope;
do {
cur = cur->child(key);
if (cur == 0) break;
key = parse_first_name(path);
} while (key != "");

if (cur) return cur;
      }

// Last chance. Look for the name starting at the root.
      return find_scope(name);
}

/*
* Find a parameter from within a specified context. If the name is
* not here, keep looking up until I run out of up to look at. The
* method works by scanning scopes, starting with the passed scope and
* working up towards the root, looking for the named parameter. The
* name in this case can be hierarchical, so there is an inner loop to
* follow the scopes of the name down to to key.
*/
const NetExpr* Design::find_parameter(const NetScope*scope,
const string&name) const
{
      for ( ; scope ; scope = scope->parent()) {
string path = name;
string key = parse_first_name(path);

const NetScope*cur = scope;
while (path != "") {
cur = cur->child(key);
if (cur == 0) break;
key = parse_first_name(path);
}

if (cur == 0) continue;

if (const NetExpr*res = cur->get_parameter(key))
return res;
      }

      return 0;
}


/*
* This method runs through the scope, noticing the defparam
* statements that were collected during the elaborate_scope pass and
* applying them to the target parameters. The implementation actually
* works by using a specialized method from the NetScope class that
* does all the work for me.
*/
void Design::run_defparams()
{
      root_scope_->run_defparams(this);
}

void NetScope::run_defparams(Design*des)
{
      NetScope*cur = sub_;
      while (cur) {
cur->run_defparams(des);
cur = cur->sib_;
      }

      map<string,NetExpr*>::const_iterator pp;
      for (pp = defparams.begin() ; pp != defparams.end() ; pp ++ ) {
NetExpr*val = (*pp).second;
string path = (*pp).first;
string name = parse_last_name(path);

NetScope*targ_scope = des->find_scope(this, path);
if (targ_scope == 0) {
cerr << val->get_line() << ": warning: scope of " <<
path << "." << name << " not found." << endl;
continue;
}

val = targ_scope->set_parameter(name, val);
if (val == 0) {
cerr << val->get_line() << ": warning: parameter "
<< name << " not found in " << targ_scope->name()
<< "." << endl;
} else {
delete val;
}
      }
}

void Design::evaluate_parameters()
{
      root_scope_->evaluate_parameters(this);
}

void NetScope::evaluate_parameters(Design*des)
{
      NetScope*cur = sub_;
      while (cur) {
cur->evaluate_parameters(des);
cur = cur->sib_;
      }


// Evaluate the parameter values. The parameter expressions
// have already been elaborated and replaced by the scope
// scanning code. Now the parameter expression can be fully
// evaluated, or it cannot be evaluated at all.

      typedef map<string,NetExpr*>::iterator mparm_it_t;

      for (mparm_it_t cur = parameters_.begin()
; cur != parameters_.end() ; cur ++) {

// Get the NetExpr for the parameter.
NetExpr*expr = (*cur).second;
assert(expr);

// If it's already a NetEConst, then this parameter is done.
if (dynamic_cast<const NetEConst*>(expr))
continue;

// Try to evaluate the expression.
NetExpr*nexpr = expr->eval_tree();
if (nexpr == 0) {
cerr << (*cur).second->get_line() << ": internal error: "
"unable to evaluate parm expression: " <<
*expr << endl;
des->errors += 1;
continue;
}

// The evaluate worked, replace the old expression with
// this constant value.
assert(nexpr);
delete expr;
(*cur).second = nexpr;
      }

}

string Design::get_flag(const string&key) const
{
      map<string,string>::const_iterator tmp = flags_.find(key);
      if (tmp == flags_.end())
return "";
      else
return (*tmp).second;
}

/*
* This method looks for a signal (reg, wire, whatever) starting at
* the specified scope. If the name is hierarchical, it is split into
* scope and name and the scope used to find the proper starting point
* for the real search.
*
* It is the job of this function to properly implement Verilog scope
* rules as signals are concerned.
*/
NetNet* Design::find_signal(NetScope*scope, const string&name)
{
      assert(scope);

/* If the name has a path attached to it, parse it off and use
that to locate the desired starting scope. */
      string path = name;
      string key = parse_last_name(path);
      if (path != "")
scope = find_scope(scope, path);

/* Now from the starting point, scan upwards until we find the
signal or we find a module boundary. */
      while (scope) {

if (NetNet*net = scope->find_signal(key))
return net;

if (scope->type() == NetScope::MODULE)
break;

scope = scope->parent();
      }

      return 0;
}

NetMemory* Design::find_memory(NetScope*scope, const string&name)
{
      assert(scope);

/* If the name has a path attached to it, parse it off and use
that to locate the desired scope. */
      string path = name;
      string key = parse_last_name(path);
      if (path != "")
scope = find_scope(scope, path);

      while (scope) {

if (NetMemory*mem = scope->find_memory(key))
return mem;
scope = scope->parent();
      }
      return 0;
}

void Design::find_symbol(NetScope*scope, const string&name,
NetNet*&sig, NetMemory*&mem)
{
      sig = 0;
      mem = 0;


/* If the name has a path attached to it, parse it off and use
that to locate the desired scope. Then locate the key
within that scope. */
      string path = name;
      string key = parse_last_name(path);
      if (path != "")
scope = find_scope(scope, path);


/* If there is no path, then just search upwards for the key. */
      while (scope) {

if (NetNet*cur = scope->find_signal(key)) {
sig = cur;
return;
}

if (NetMemory*cur = scope->find_memory(key)) {
mem = cur;
return;
}

scope = scope->parent();
      }
}

NetFuncDef* Design::find_function(const string&path, const string&name)
{
      NetScope*scope = find_scope(path);
      assert(scope);
      NetScope*func = find_scope(scope, name);
      if (func->type() == NetScope::FUNC)
return func->func_def();

      return 0;
}

NetFuncDef* Design::find_function(const string&key)
{
      NetScope*func = find_scope(key);
      if (func && (func->type() == NetScope::FUNC))
return func->func_def();

      return 0;
}

NetTaskDef* Design::find_task(const string&path, const string&name)
{
      NetScope*scope = find_scope(path);
      assert(scope);
      NetScope*task = find_scope(scope, name);
      if (task->type() == NetScope::TASK)
return task->task_def();

      return 0;
}

NetTaskDef* Design::find_task(const string&key)
{
      NetScope*task = find_scope(key);
      if (task && (task->type() == NetScope::TASK))
return task->task_def();

      return 0;
}

void Design::add_node(NetNode*net)
{
      assert(net->design_ == 0);
      if (nodes_ == 0) {
net->node_next_ = net;
net->node_prev_ = net;
      } else {
net->node_next_ = nodes_->node_next_;
net->node_prev_ = nodes_;
net->node_next_->node_prev_ = net;
net->node_prev_->node_next_ = net;
      }
      nodes_ = net;
      net->design_ = this;
}

void Design::del_node(NetNode*net)
{
      assert(net->design_ == this);
      if (nodes_ == net)
nodes_ = net->node_prev_;

      if (nodes_ == net) {
nodes_ = 0;
      } else {
net->node_next_->node_prev_ = net->node_prev_;
net->node_prev_->node_next_ = net->node_next_;
      }

      net->design_ = 0;
}

void Design::add_process(NetProcTop*pro)
{
      pro->next_ = procs_;
      procs_ = pro;
}

void Design::delete_process(NetProcTop*top)
{
      assert(top);
      if (procs_ == top) {
procs_ = top->next_;

      } else {
NetProcTop*cur = procs_;
while (cur->next_ != top) {
assert(cur->next_);
cur = cur->next_;
}

cur->next_ = top->next_;
      }

      if (procs_idx_ == top)
procs_idx_ = top->next_;

      delete top;
}

/*
* $Log: net_design.cc,v $
* Revision 1.14 2000/08/12 17:59:48 steve
* Limit signal scope search at module boundaries.
*
* Revision 1.13 2000/07/30 18:25:43 steve
* Rearrange task and function elaboration so that the
* NetTaskDef and NetFuncDef functions are created during
* signal enaboration, and carry these objects in the
* NetScope class instead of the extra, useless map in
* the Design class.
*
* Revision 1.12 2000/07/23 02:41:32 steve
* Excessive assert.
*
* Revision 1.11 2000/07/22 22:09:03 steve
* Parse and elaborate timescale to scopes.
*
* Revision 1.10 2000/07/16 04:56:08 steve
* Handle some edge cases during node scans.
*
* Revision 1.9 2000/07/14 06:12:57 steve
* Move inital value handling from NetNet to Nexus
* objects. This allows better propogation of inital
* values.
*
* Clean up constant propagation a bit to account
* for regs that are not really values.
*
* Revision 1.8 2000/05/02 16:27:38 steve
* Move signal elaboration to a seperate pass.
*
* Revision 1.7 2000/05/02 03:13:31 steve
* Move memories to the NetScope object.
*
* Revision 1.6 2000/05/02 00:58:12 steve
* Move signal tables to the NetScope class.
*
* Revision 1.5 2000/04/28 16:50:53 steve
* Catch memory word parameters to tasks.
*
* Revision 1.4 2000/04/10 05:26:06 steve
* All events now use the NetEvent class.
*
* Revision 1.3 2000/03/11 03:25:52 steve
* Locate scopes in statements.
*
* Revision 1.2 2000/03/10 06:20:48 steve
* Handle defparam to partial hierarchical names.
*
* Revision 1.1 2000/03/08 04:36:53 steve
* Redesign the implementation of scopes and parameters.
* I now generate the scopes and notice the parameters
* in a separate pass over the pform. Once the scopes
* are generated, I can process overrides and evalutate
* paremeters before elaboration begins.
*
*/
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