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sc_time.cpp
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/*****************************************************************************
The following code is derived, directly or indirectly, from the SystemC
source code Copyright (c) 1996-2011 by all Contributors.
All Rights reserved.
The contents of this file are subject to the restrictions and limitations
set forth in the SystemC Open Source License Version 3.0 (the "License");
You may not use this file except in compliance with such restrictions and
limitations. You may obtain instructions on how to receive a copy of the
License at http://www.systemc.org/. Software distributed by Contributors
under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
ANY KIND, either express or implied. See the License for the specific
language governing rights and limitations under the License.
*****************************************************************************/
/*****************************************************************************
sc_time.cpp --
Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21
CHANGE LOG AT THE END OF THE FILE
*****************************************************************************/
#include <math.h>
#include <stdio.h>
#include "sysc/kernel/sc_kernel_ids.h"
#include "sysc/kernel/sc_simcontext.h"
#include "sysc/kernel/sc_time.h"
#include "sysc/utils/sc_utils_ids.h"
#if !defined(PRIu64)
# if defined(_MSC_VER) || defined(__MINGW32__)
# define PRIu64 "I64u"
# else
# define PRIu64 "llu"
# endif
#endif // PRIu64
namespace sc_core {
static
double time_values[] = {
1, // fs
1e3, // ps
1e6, // ns
1e9, // us
1e12, // ms
1e15 // s
};
static
const char* time_units[] = {
"fs",
"ps",
"ns",
"us",
"ms",
"s"
};
// ----------------------------------------------------------------------------
// CLASS : sc_time
//
// The time class.
// ----------------------------------------------------------------------------
// constructors
sc_time::sc_time( double v, sc_time_unit tu )
: m_value( 0 )
{
if( v != 0 ) {
sc_time_params* time_params = sc_get_curr_simcontext()->m_time_params;
double scale_fac = time_values[tu] / time_params->time_resolution;
// linux bug workaround; don't change next two lines
volatile double tmp = v * scale_fac + 0.5;
m_value = SCAST<sc_dt::int64>( tmp );
time_params->time_resolution_fixed = true;
}
}
sc_time::sc_time( double v, sc_time_unit tu, sc_simcontext* simc )
: m_value( 0 )
{
if( v != 0 ) {
sc_time_params* time_params = simc->m_time_params;
double scale_fac = time_values[tu] / time_params->time_resolution;
// linux bug workaround; don't change next two lines
volatile double tmp = v * scale_fac + 0.5;
m_value = SCAST<sc_dt::int64>( tmp );
time_params->time_resolution_fixed = true;
}
}
sc_time::sc_time( double v, bool scale )
: m_value( 0 )
{
if( v != 0 ) {
sc_time_params* time_params = sc_get_curr_simcontext()->m_time_params;
if( scale ) {
double scale_fac = sc_dt::uint64_to_double(
time_params->default_time_unit );
// linux bug workaround; don't change next two lines
volatile double tmp = v * scale_fac + 0.5;
m_value = SCAST<sc_dt::int64>( tmp );
} else {
// linux bug workaround; don't change next two lines
volatile double tmp = v + 0.5;
m_value = SCAST<sc_dt::int64>( tmp );
}
time_params->time_resolution_fixed = true;
}
}
sc_time::sc_time( sc_dt::uint64 v, bool scale )
: m_value( 0 )
{
if( v != 0 ) {
sc_time_params* time_params = sc_get_curr_simcontext()->m_time_params;
if( scale ) {
double scale_fac = sc_dt::uint64_to_double(
time_params->default_time_unit );
// linux bug workaround; don't change next two lines
volatile double tmp = sc_dt::uint64_to_double( v ) *
scale_fac + 0.5;
m_value = SCAST<sc_dt::int64>( tmp );
} else {
m_value = v;
}
time_params->time_resolution_fixed = true;
}
}
// conversion functions
double
sc_time::to_default_time_units() const
{
sc_time_params* time_params = sc_get_curr_simcontext()->m_time_params;
return ( sc_dt::uint64_to_double( m_value ) /
sc_dt::uint64_to_double( time_params->default_time_unit ) );
}
double
sc_time::to_seconds() const
{
sc_time_params* time_params = sc_get_curr_simcontext()->m_time_params;
return ( sc_dt::uint64_to_double( m_value ) *
time_params->time_resolution * 1e-15 );
}
const std::string
sc_time::to_string() const
{
sc_dt::uint64 val = m_value;
if( val == 0 ) {
return std::string( "0 s" );
}
sc_time_params* time_params = sc_get_curr_simcontext()->m_time_params;
sc_dt::uint64 tr = SCAST<sc_dt::int64>( time_params->time_resolution );
int n = 0;
while( ( tr % 10 ) == 0 ) {
tr /= 10;
n ++;
}
assert( tr == 1 );
while( ( val % 10 ) == 0 ) {
val /= 10;
n ++;
}
char buf[BUFSIZ];
std::sprintf( buf, "%"PRIu64, val );
std::string result( buf );
if( n >= 15 ) {
for( int i = n - 15; i > 0; -- i ) {
result += "0";
}
result += " s";
} else {
for( int i = n % 3; i > 0; -- i ) {
result += "0";
}
result += " ";
result += time_units[n / 3];
}
return result;
}
// print function
void
sc_time::print( ::std::ostream& os ) const
{
os << to_string();
}
// ----------------------------------------------------------------------------
// STRUCT : sc_time_params
//
// Struct that holds the time resolution and default time unit.
// ----------------------------------------------------------------------------
sc_time_params::sc_time_params()
: time_resolution( 1000 ), // default 1 ps
time_resolution_specified( false ),
time_resolution_fixed( false ),
default_time_unit( 1000 ), // default 1 ns
default_time_unit_specified( false )
{}
sc_time_params::~sc_time_params()
{}
// ----------------------------------------------------------------------------
// functions for accessing the time resolution and default time unit
void
sc_set_time_resolution( double v, sc_time_unit tu )
{
// first perform the necessary checks
// must be positive
if( v < 0.0 ) {
SC_REPORT_ERROR( SC_ID_SET_TIME_RESOLUTION_, "value not positive" );
}
// must be a power of ten
double dummy;
#if defined( __HP_aCC ) || defined(__ppc__)
// aCC seems to have a bug in modf()
if( modf( log10( v < 1.0 ? 1.0/v : v ), &dummy ) != 0.0 ) {
#else
if( modf( log10( v ), &dummy ) != 0.0 ) {
#endif
SC_REPORT_ERROR( SC_ID_SET_TIME_RESOLUTION_,
"value not a power of ten" );
}
sc_simcontext* simc = sc_get_curr_simcontext();
// can only be specified during elaboration
if( sc_is_running() ) {
SC_REPORT_ERROR( SC_ID_SET_TIME_RESOLUTION_, "simulation running" );
}
sc_time_params* time_params = simc->m_time_params;
// can be specified only once
if( time_params->time_resolution_specified ) {
SC_REPORT_ERROR( SC_ID_SET_TIME_RESOLUTION_, "already specified" );
}
// can only be specified before any sc_time is constructed
if( time_params->time_resolution_fixed ) {
SC_REPORT_ERROR( SC_ID_SET_TIME_RESOLUTION_,
"sc_time object(s) constructed" );
}
// must be larger than or equal to 1 fs
volatile double resolution = v * time_values[tu];
if( resolution < 1.0 ) {
SC_REPORT_ERROR( SC_ID_SET_TIME_RESOLUTION_,
"value smaller than 1 fs" );
}
// recalculate the default time unit
volatile double time_unit = sc_dt::uint64_to_double(
time_params->default_time_unit ) *
( time_params->time_resolution / resolution );
if( time_unit < 1.0 ) {
SC_REPORT_WARNING( SC_ID_DEFAULT_TIME_UNIT_CHANGED_, 0 );
time_params->default_time_unit = 1;
} else {
time_params->default_time_unit = SCAST<sc_dt::int64>( time_unit );
}
time_params->time_resolution = resolution;
time_params->time_resolution_specified = true;
}
sc_time
sc_get_time_resolution()
{
return sc_time( sc_dt::UINT64_ONE, false );
}
void
sc_set_default_time_unit( double v, sc_time_unit tu )
{
static bool warn_default_time_unit=true;
if ( warn_default_time_unit )
{
warn_default_time_unit=false;
SC_REPORT_INFO(SC_ID_IEEE_1666_DEPRECATION_,
"deprecated function: sc_set_default_time_unit");
}
// first perform the necessary checks
// must be positive
if( v < 0.0 ) {
SC_REPORT_ERROR( SC_ID_SET_DEFAULT_TIME_UNIT_, "value not positive" );
}
// must be a power of ten
double dummy;
if( modf( log10( v ), &dummy ) != 0.0 ) {
SC_REPORT_ERROR( SC_ID_SET_DEFAULT_TIME_UNIT_,
"value not a power of ten" );
}
sc_simcontext* simc = sc_get_curr_simcontext();
// can only be specified during elaboration
if( sc_is_running() ) {
SC_REPORT_ERROR( SC_ID_SET_DEFAULT_TIME_UNIT_, "simulation running" );
}
sc_time_params* time_params = simc->m_time_params;
// can only be specified before any sc_time is constructed
if( time_params->time_resolution_fixed ) {
SC_REPORT_ERROR( SC_ID_SET_DEFAULT_TIME_UNIT_,
"sc_time object(s) constructed" );
}
// can be specified only once
if( time_params->default_time_unit_specified ) {
SC_REPORT_ERROR( SC_ID_SET_DEFAULT_TIME_UNIT_, "already specified" );
}
// must be larger than or equal to the time resolution
volatile double time_unit = ( v * time_values[tu] ) /
time_params->time_resolution;
if( time_unit < 1.0 ) {
SC_REPORT_ERROR( SC_ID_SET_DEFAULT_TIME_UNIT_,
"value smaller than time resolution" );
}
time_params->default_time_unit = SCAST<sc_dt::int64>( time_unit );
time_params->default_time_unit_specified = true;
}
sc_time
sc_get_default_time_unit()
{
bool warn_get_default_time_unit = true;
if ( warn_get_default_time_unit )
{
warn_get_default_time_unit=false;
SC_REPORT_INFO(SC_ID_IEEE_1666_DEPRECATION_,
"deprecated function: sc_get_default_time_unit");
}
return sc_time( sc_get_curr_simcontext()->m_time_params->default_time_unit,
false );
}
// ----------------------------------------------------------------------------
const sc_time SC_ZERO_TIME;
} // namespace sc_core
// $Log: sc_time.cpp,v $
// Revision 1.7 2011/08/26 20:46:11 acg
// Andy Goodrich: moved the modification log to the end of the file to
// eliminate source line number skew when check-ins are done.
//
// Revision 1.6 2011/07/24 16:08:36 acg
// Philipp A. Hartmann: fix C99 format specifiers for Solaris.
//
// Revision 1.5 2011/02/18 20:27:14 acg
// Andy Goodrich: Updated Copyrights.
//
// Revision 1.4 2011/02/13 21:47:38 acg
// Andy Goodrich: update copyright notice.
//
// Revision 1.3 2011/01/19 23:21:50 acg
// Andy Goodrich: changes for IEEE 1666 2011
//
// Revision 1.2 2008/05/22 17:06:27 acg
// Andy Goodrich: updated copyright notice to include 2008.
//
// Revision 1.1.1.1 2006/12/15 20:20:05 acg
// SystemC 2.3
//
// Revision 1.6 2006/01/26 21:04:55 acg
// Andy Goodrich: deprecation message changes and additional messages.
//
// Revision 1.5 2006/01/25 00:31:19 acg
// Andy Goodrich: Changed over to use a standard message id of
// SC_ID_IEEE_1666_DEPRECATION for all deprecation messages.
//
// Revision 1.4 2006/01/24 20:49:05 acg
// Andy Goodrich: changes to remove the use of deprecated features within the
// simulator, and to issue warning messages when deprecated features are used.
//
// Revision 1.3 2006/01/13 18:44:30 acg
// Added $Log to record CVS changes into the source.
//
// Taf!