Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

137 lines (123 sloc) 5.13 kb
#ifndef __netmisc_H
#define __netmisc_H
/*
* Copyright (c) 1999-2000 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
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: netmisc.h,v 1.31 2007/06/02 03:42:13 steve Exp $"
#endif
# include "netlist.h"
/*
* Search for a symbol using the "start" scope as the starting
* point. If the path includes a scope part, then locate the
* scope first.
*
* The return value is the scope where the symbol was found.
* If the symbol was not found, return 0. The output arguments
* get 0 except for the pointer to the object that represents
* the located symbol.
*
* The ex1 and ex2 output arguments are extended results. If the
* symbol is a parameter (par!=0) then ex1 is the msb expression and
* ex2 is the lsb expression for the range. If there is no range, then
* these values are set to 0.
*/
extern NetScope* symbol_search(Design*des,
NetScope*start, pform_name_t path,
NetNet*&net, /* net/reg */
const NetExpr*&par,/* parameter */
NetEvent*&eve, /* named event */
const NetExpr*&ex1, const NetExpr*&ex2);
inline NetScope* symbol_search(Design*des,
NetScope*start, const pform_name_t&path,
NetNet*&net, /* net/reg */
const NetExpr*&par,/* parameter */
NetEvent*&eve /* named event */)
{
const NetExpr*ex1, *ex2;
return symbol_search(des, start, path, net, par, eve, ex1, ex2);
}
/*
* This function transforms an expression by padding the high bits
* with V0 until the expression has the desired width. This may mean
* not transforming the expression at all, if it is already wide
* enough.
*/
extern NetExpr*pad_to_width(NetExpr*expr, unsigned wid);
extern NetNet*pad_to_width(Design*des, NetNet*n, unsigned w);
extern NetNet*pad_to_width_signed(Design*des, NetNet*n, unsigned w);
/*
* This function transforms an expression by cropping the high bits
* off with a part select. The result has the width w passed in. This
* function does not pad, use pad_to_width if padding is desired.
*/
extern NetNet*crop_to_width(Design*des, NetNet*n, unsigned w);
/*
* This function takes as input a NetNet signal and adds a constant
* value to it. If the val is 0, then simply return sig. Otherwise,
* return a new NetNet value that is the output of an addition.
*/
extern NetNet*add_to_net(Design*des, NetNet*sig, long val);
/*
* These functions make various sorts of expressions, given operands
* of certain type. The order of the operands is preserved in cases
* where order matters.
*
* make_add_expr
* Make a NetEBAdd expression with <expr> the first argument and
* <val> the second. This may get turned into a subtract if <val> is
* less then zero. If val is exactly zero, then return <expr> as is.
*
* make_sub_expr
* Make a NetEBAdd(subtract) node that subtracts the given
* expression from the integer value.
*/
extern NetExpr*make_add_expr(NetExpr*expr, long val);
extern NetExpr*make_sub_expr(long val, NetExpr*expr);
/*
* In some cases the lval is accessible as a pointer to the head of
* a list of NetAssign_ objects. This function returns the width of
* the l-value represented by this list.
*/
extern unsigned count_lval_width(const class NetAssign_*first);
/*
* This function elaborates an expression, and tries to evaluate it
* right away. If the expression can be evaluated, this returns a
* constant expression. If it cannot be evaluated, it returns whatever
* it can. If the expression cannot be elaborated, return 0.
*
* The expr_width is the width of the context where the expression is
* being elaborated, or -1 if the expression is self-determined width.
*
* Also, the prune_width is the maximum width of the result, and it
* passed to the eval_tree method of the expression to limit constant
* results if possible.
*/
class PExpr;
extern NetExpr* elab_and_eval(Design*des, NetScope*scope,
const PExpr*pe, int expr_wid,
int prune_width =-1);
/*
* Get the long integer value for the passed in expression, if
* possible. If it is not possible (the expression is not evaluated
* down to a constant) then return false and leave value unchanged.
*/
bool eval_as_long(long&value, NetExpr*expr);
extern std::list<hname_t> eval_scope_path(Design*des, NetScope*scope,
const pform_name_t&path);
#endif
Jump to Line
Something went wrong with that request. Please try again.