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//===-- ExecutorTimers.cpp ------------------------------------------------===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "CoreStats.h"
#include "Executor.h"
#include "ExecutorTimerInfo.h"
#include "PTree.h"
#include "StatsTracker.h"
#include "klee/ExecutionState.h"
#include "klee/Internal/Module/InstructionInfoTable.h"
#include "klee/Internal/Module/KInstruction.h"
#include "klee/Internal/Module/KModule.h"
#include "klee/Internal/Support/ErrorHandling.h"
#include "klee/Internal/System/Time.h"
#include "klee/OptionCategories.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include <math.h>
#include <signal.h>
#include <string>
#include <sys/time.h>
#include <unistd.h>
using namespace llvm;
using namespace klee;
namespace klee {
cl::opt<std::string>
MaxTime("max-time",
cl::desc("Halt execution after the specified number of seconds. "
"Set to 0s to disable (default=0s)"),
cl::init("0s"),
cl::cat(TerminationCat));
}
///
class HaltTimer : public Executor::Timer {
Executor *executor;
public:
HaltTimer(Executor *_executor) : executor(_executor) {}
~HaltTimer() {}
void run() {
klee_message("HaltTimer invoked");
executor->setHaltExecution(true);
}
};
///
static const time::Span kMilliSecondsPerTick(time::milliseconds(100));
static volatile unsigned timerTicks = 0;
static void onAlarm(int) {
++timerTicks;
}
// oooogalay
static void setupHandler() {
itimerval t{};
timeval tv = static_cast<timeval>(kMilliSecondsPerTick);
t.it_interval = t.it_value = tv;
::setitimer(ITIMER_REAL, &t, nullptr);
::signal(SIGALRM, onAlarm);
}
void Executor::initTimers() {
static bool first = true;
if (first) {
first = false;
setupHandler();
}
const time::Span maxTime(MaxTime);
if (maxTime) {
addTimer(new HaltTimer(this), maxTime);
}
}
///
Executor::Timer::Timer() {}
Executor::Timer::~Timer() {}
void Executor::addTimer(Timer *timer, time::Span rate) {
timers.push_back(new TimerInfo(timer, rate));
}
void Executor::processTimers(ExecutionState *current,
time::Span maxInstTime) {
static unsigned callsWithoutCheck = 0;
unsigned ticks = timerTicks;
if (!ticks && ++callsWithoutCheck > 1000) {
setupHandler();
ticks = 1;
}
if (ticks) {
if (maxInstTime && current &&
std::find(removedStates.begin(), removedStates.end(), current) ==
removedStates.end()) {
if (timerTicks * kMilliSecondsPerTick > maxInstTime) {
klee_warning("max-instruction-time exceeded: %.2fs", (timerTicks * kMilliSecondsPerTick).toSeconds());
terminateStateEarly(*current, "max-instruction-time exceeded");
}
}
if (!timers.empty()) {
auto time = time::getWallTime();
for (std::vector<TimerInfo*>::iterator it = timers.begin(),
ie = timers.end(); it != ie; ++it) {
TimerInfo *ti = *it;
if (time >= ti->nextFireTime) {
ti->timer->run();
ti->nextFireTime = time + ti->rate;
}
}
}
timerTicks = 0;
callsWithoutCheck = 0;
}
}
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