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/* :nodoc:
* Copyright (C) 2008 Shugo Maeda <shugo@ruby-lang.org>
* Charlie Savage <cfis@savagexi.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE. */
#include <ruby.h>
#if defined(_WIN32) || (defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || defined(__ppc__)))
#define MEASURE_CPU_TIME 2
static unsigned long long cpu_frequency;
#if defined(__GNUC__)
#include <stdint.h>
static prof_measure_t
measure_cpu_time()
{
#if defined(__i386__) || defined(__x86_64__)
uint32_t a, d;
__asm__ volatile("rdtsc" : "=a" (a), "=d" (d));
return ((uint64_t)d << 32) + a;
#elif defined(__powerpc__) || defined(__ppc__)
unsigned long long x, y;
__asm__ __volatile__ ("\n\
1: mftbu %1\n\
mftb %L0\n\
mftbu %0\n\
cmpw %0,%1\n\
bne- 1b"
: "=r" (x), "=r" (y));
return x;
#endif
}
#elif defined(_WIN32)
static prof_measure_t
measure_cpu_time()
{
prof_measure_t cycles = 0;
__asm
{
rdtsc
mov DWORD PTR cycles, eax
mov DWORD PTR [cycles + 4], edx
}
return cycles;
}
#endif
/* The _WIN32 check is needed for msys (and maybe cygwin?) */
#if defined(__GNUC__) && !defined(_WIN32)
unsigned long long get_cpu_frequency()
{
unsigned long long x, y;
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 500000000;
x = measure_cpu_time();
nanosleep(&ts, NULL);
y = measure_cpu_time();
return (y - x) * 2;
}
#elif defined(_WIN32)
unsigned long long get_cpu_frequency()
{
unsigned long long x, y;
unsigned long long frequency;
x = measure_cpu_time();
/* Use the windows sleep function, not Ruby's */
Sleep(500);
y = measure_cpu_time();
frequency = 2*(y-x);
return frequency;
}
#endif
static double
convert_cpu_time(prof_measure_t c)
{
return (double) c / cpu_frequency;
}
/* Document-method: prof_measure_cpu_time
call-seq:
measure_cpu_time -> float
Returns the cpu time.*/
static VALUE
prof_measure_cpu_time(VALUE self)
{
return rb_float_new(convert_cpu_time(measure_cpu_time()));
}
/* Document-method: prof_get_cpu_frequency
call-seq:
cpu_frequency -> int
Returns the cpu's frequency. This value is needed when
RubyProf::measure_mode is set to CPU_TIME. */
static VALUE
prof_get_cpu_frequency(VALUE self)
{
return ULL2NUM(cpu_frequency);
}
/* Document-method: prof_set_cpu_frequency
call-seq:
cpu_frequency=value -> void
Sets the cpu's frequency. This value is needed when
RubyProf::measure_mode is set to CPU_TIME. */
static VALUE
prof_set_cpu_frequency(VALUE self, VALUE val)
{
cpu_frequency = NUM2LL(val);
return val;
}
#endif
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