Skip to content
This repository
tag: s20051127
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 181 lines (169 sloc) 6.458 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
#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 1.24 2005/11/27 05:56:20 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(const Design*des,
NetScope*start, hname_t path,
NetNet*&net, /* net/reg */
NetMemory*&mem, /* memory */
const NetExpr*&par,/* parameter */
NetEvent*&eve, /* named event */
const NetExpr*&ex1, const NetExpr*&ex2);

inline NetScope* symbol_search(const Design*des,
NetScope*start, const hname_t&path,
NetNet*&net, /* net/reg */
NetMemory*&mem, /* memory */
const NetExpr*&par,/* parameter */
NetEvent*&eve /* named event */)
{
      const NetExpr*ex1, *ex2;
      return symbol_search(des, start, path, net, mem, 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 expresion 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.
*/
class PExpr;
extern NetExpr* elab_and_eval(Design*des, NetScope*scope, const PExpr*pe);

/*
* $Log: netmisc.h,v $
* Revision 1.24 2005/11/27 05:56:20 steve
* Handle bit select of parameter with ranges.
*
* Revision 1.23 2005/07/11 16:56:51 steve
* Remove NetVariable and ivl_variable_t structures.
*
* Revision 1.22 2005/05/24 01:44:28 steve
* Do sign extension of structuran nets.
*
* Revision 1.21 2005/04/24 23:44:02 steve
* Update DFF support to new data flow.
*
* Revision 1.20 2005/01/24 05:28:31 steve
* Remove the NetEBitSel and combine all bit/part select
* behavior into the NetESelect node and IVL_EX_SELECT
* ivl_target expression type.
*
* Revision 1.19 2004/03/07 20:04:11 steve
* MOre thorough use of elab_and_eval function.
*
* Revision 1.18 2003/09/19 03:30:05 steve
* Fix name search in elab_lval.
*
* Revision 1.17 2003/01/30 16:23:08 steve
* Spelling fixes.
*
* Revision 1.16 2002/08/31 03:48:50 steve
* Fix reverse bit ordered bit select in continuous assignment.
*
* Revision 1.15 2002/08/12 01:35:00 steve
* conditional ident string using autoconfig.
*
* Revision 1.14 2002/06/25 01:33:22 steve
* Cache calculated driven value.
*
* Revision 1.13 2002/06/24 01:49:39 steve
* Make link_drive_constant cache its results in
* the Nexus, to improve cprop performance.
*
* Revision 1.12 2001/02/15 06:59:36 steve
* FreeBSD port has a maintainer now.
*
* Revision 1.11 2001/02/10 20:29:39 steve
* In the context of range declarations, use elab_and_eval instead
* of the less robust eval_const methods.
*
* Revision 1.10 2000/11/20 00:58:40 steve
* Add support for supply nets (PR#17)
*
* Revision 1.9 2000/09/20 02:53:15 steve
* Correctly measure comples l-values of assignments.
*
* Revision 1.8 2000/06/25 19:59:42 steve
* Redesign Links to include the Nexus class that
* carries properties of the connected set of links.
*
* Revision 1.7 2000/05/14 17:55:04 steve
* Support initialization of FF Q value.
*/
#endif
Something went wrong with that request. Please try again.