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//===-- Time.cpp ----------------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "klee/Support/ErrorHandling.h"
#include "klee/System/Time.h"
#include <cstdint>
#include <regex>
#include <sstream>
#include <tuple>
#include <sys/resource.h>
using namespace klee;
/* Why std::chrono:
* - C++11
* - separation between time points and durations
* - good performance on Linux and macOS (similar to gettimeofday)
* and not:
* - clock_gettime(CLOCK_MONOTONIC_COARSE): software clock, Linux-specific
* - clock_gettime(CLOCK_MONOTONIC): slowest on macOS, C-like API
* - gettimeofday: C-like API, non-monotonic
*
* TODO: add time literals with C++14
*/
// === Point ===
// operators
time::Point& time::Point::operator+=(const time::Span &span) { point += span.duration; return *this; }
time::Point& time::Point::operator-=(const time::Span &span) { point -= span.duration; return *this; }
time::Point time::operator+(const time::Point &point, const time::Span &span) { return time::Point(point.point + span.duration); }
time::Point time::operator+(const time::Span &span, const time::Point &point) { return time::Point(point.point + span.duration); }
time::Point time::operator-(const time::Point &point, const time::Span &span) { return time::Point(point.point - span.duration); }
time::Span time::operator-(const time::Point &lhs, const time::Point &rhs) { return time::Span(lhs.point - rhs.point); }
bool time::operator==(const time::Point &lhs, const time::Point &rhs) { return lhs.point == rhs.point; }
bool time::operator!=(const time::Point &lhs, const time::Point &rhs) { return lhs.point != rhs.point; }
bool time::operator<(const time::Point &lhs, const time::Point &rhs) { return lhs.point < rhs.point; }
bool time::operator<=(const time::Point &lhs, const time::Point &rhs) { return lhs.point <= rhs.point; }
bool time::operator>(const time::Point &lhs, const time::Point &rhs) { return lhs.point > rhs.point; }
bool time::operator>=(const time::Point &lhs, const time::Point &rhs) { return lhs.point >= rhs.point; }
// === Span ===
// ctors
/// returns span from string in old (X.Y) and new (3h4min) format
time::Span::Span(const std::string &s) {
if (s.empty()) return;
std::regex re("^([0-9]*\\.?[0-9]+)|((([0-9]+)(h|min|s|ms|us|ns))+)$", std::regex::extended);
std::regex nre("([0-9]+)(h|min|s|ms|us|ns)", std::regex::extended);
std::smatch match;
std::string submatch;
// error
if (!std::regex_match(s, match, re)) goto error;
// old (double) format
submatch = match[1].str();
if (match[1].matched) {
errno = 0;
auto value = std::stod(submatch);
if (errno) goto error;
std::chrono::duration<double> d(value);
duration = std::chrono::duration_cast<std::chrono::microseconds>(d);
}
// new (string) format
submatch = match[2].str();
for (std::smatch m; std::regex_search(submatch, m, nre); submatch = m.suffix()) {
errno = 0;
const auto value = std::stoull(m[1]);
if (errno) goto error;
Duration d;
if (m[2] == "h") d = std::chrono::hours(value);
else if (m[2] == "min") d = std::chrono::minutes(value);
else if (m[2] == "s") d = std::chrono::seconds(value);
else if (m[2] == "ms") d = std::chrono::milliseconds(value);
else if (m[2] == "us") d = std::chrono::microseconds(value);
else if (m[2] == "ns") d = std::chrono::nanoseconds(value);
else goto error;
duration += d;
}
return;
error:
klee_error("Illegal number format: %s", s.c_str());
}
// operators
time::Span& time::Span::operator=(const time::Duration &d) { duration = d; return *this; };
time::Span& time::Span::operator+=(const time::Span &other) { duration += other.duration; return *this; }
time::Span& time::Span::operator-=(const time::Span &other) { duration -= other.duration; return *this; }
time::Span& time::Span::operator*=(unsigned factor) { duration *= factor; return *this; }
time::Span& time::Span::operator*=(double factor) {
duration = std::chrono::microseconds((std::uint64_t)((double)toMicroseconds() * factor));
return *this;
}
time::Span time::operator+(const time::Span &lhs, const time::Span &rhs) { return time::Span(lhs.duration + rhs.duration); }
time::Span time::operator-(const time::Span &lhs, const time::Span &rhs) { return time::Span(lhs.duration - rhs.duration); }
time::Span time::operator*(const time::Span &span, double factor) {
return time::Span(std::chrono::microseconds((std::uint64_t)((double)span.toMicroseconds() * factor)));
};
time::Span time::operator*(double factor, const time::Span &span) {
return time::Span(std::chrono::microseconds((std::uint64_t)((double)span.toMicroseconds() * factor)));
};
time::Span time::operator*(const time::Span &span, unsigned factor) { return time::Span(span.duration * factor); }
time::Span time::operator*(unsigned factor, const time::Span &span) { return time::Span(span.duration * factor); }
time::Span time::operator/(const time::Span &span, unsigned divisor) { return time::Span(span.duration / divisor); }
bool time::operator==(const time::Span &lhs, const time::Span &rhs) { return lhs.duration == rhs.duration; }
bool time::operator<=(const time::Span &lhs, const time::Span &rhs) { return lhs.duration <= rhs.duration; }
bool time::operator>=(const time::Span &lhs, const time::Span &rhs) { return lhs.duration >= rhs.duration; }
bool time::operator<(const time::Span &lhs, const time::Span &rhs) { return lhs.duration < rhs.duration; }
bool time::operator>(const time::Span &lhs, const time::Span &rhs) { return lhs.duration > rhs.duration; }
std::ostream& time::operator<<(std::ostream &stream, time::Span span) { return stream << span.toSeconds() << 's'; }
llvm::raw_ostream& time::operator<<(llvm::raw_ostream &stream, time::Span span) { return stream << span.toSeconds() << 's'; }
// units
time::Span time::hours(std::uint16_t ticks) { return time::Span(std::chrono::hours(ticks)); }
time::Span time::minutes(std::uint16_t ticks) { return time::Span(std::chrono::minutes(ticks)); }
time::Span time::seconds(std::uint64_t ticks) { return time::Span(std::chrono::seconds(ticks)); }
time::Span time::milliseconds(std::uint64_t ticks) { return time::Span(std::chrono::milliseconds(ticks)); }
time::Span time::microseconds(std::uint64_t ticks) { return time::Span(std::chrono::microseconds(ticks)); }
time::Span time::nanoseconds(std::uint64_t ticks) { return time::Span(std::chrono::nanoseconds(ticks)); }
// conversions
time::Span::operator time::Duration() const { return duration; }
time::Span::operator bool() const { return duration.count() != 0; }
time::Span::operator timeval() const {
timeval tv{};
const auto secs = std::chrono::duration_cast<std::chrono::seconds>(duration);
const auto usecs = std::chrono::duration_cast<std::chrono::microseconds>(duration - secs);
tv.tv_sec = secs.count();
tv.tv_usec = usecs.count();
return tv;
}
std::uint64_t time::Span::toMicroseconds() const {
return (std::uint64_t)std::chrono::duration_cast<std::chrono::microseconds>(duration).count();
}
double time::Span::toSeconds() const {
return std::chrono::duration_cast<std::chrono::nanoseconds>(duration).count() / (double)1000000000;
}
std::tuple<std::uint32_t, std::uint8_t, std::uint8_t> time::Span::toHMS() const {
auto d = duration;
const auto h = std::chrono::duration_cast<std::chrono::hours>(d);
const auto m = std::chrono::duration_cast<std::chrono::minutes>(d -= h);
const auto s = std::chrono::duration_cast<std::chrono::seconds>(d -= m);
return std::make_tuple((std::uint32_t) h.count(), (std::uint8_t) m.count(), (std::uint8_t) s.count());
}
// methods
/// Returns information about clock
std::string time::getClockInfo() {
std::stringstream buffer;
buffer << "Using monotonic steady clock with "
<< std::chrono::steady_clock::period::num
<< '/'
<< std::chrono::steady_clock::period::den
<< "s resolution\n";
return buffer.str();
}
/// Returns time spent by this process in user mode
time::Span time::getUserTime() {
rusage usage{};
auto ret = ::getrusage(RUSAGE_SELF, &usage);
if (ret) {
klee_warning("getrusage returned with error, return (0,0)");
return {};
} else {
return time::seconds(static_cast<std::uint64_t>(usage.ru_utime.tv_sec)) +
time::microseconds(static_cast<std::uint64_t>(usage.ru_utime.tv_usec));
}
}
/// Returns point in time using a monotonic steady clock
time::Point time::getWallTime() {
return time::Point(std::chrono::steady_clock::now());
}
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