Source/JavaScriptCore: Add LLINT and baseline JIT support for timing out scripts.
https://bugs.webkit.org/show_bug.cgi?id=114577.

Reviewed by Geoffrey Garen.

Introduces the new Watchdog class which is used to track script
execution time, and initiate script termination if needed.

* API/JSContextRef.cpp:
(internalScriptTimeoutCallback):
(JSContextGroupSetExecutionTimeLimit):
(JSContextGroupClearExecutionTimeLimit):
* API/JSContextRefPrivate.h:
- Added new script execution time limit APIs.
* API/tests/testapi.c:
(currentCPUTime):
(shouldTerminateCallback):
(cancelTerminateCallback):
(extendTerminateCallback):
(main):
- Added new API tests for script execution time limit.
* CMakeLists.txt:
* GNUmakefile.list.am:
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.vcproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* Target.pri:
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::emitLoopHint):
- loop hints are needed for the llint as well. Hence, it will be
  emitted unconditionally.
* interpreter/Interpreter.cpp:
(JSC::Interpreter::addStackTraceIfNecessary):
(JSC::Interpreter::throwException):
(JSC::Interpreter::execute):
(JSC::Interpreter::executeCall):
(JSC::Interpreter::executeConstruct):
- Added checks for script termination before entering script code.
* jit/JIT.cpp:
(JSC::JIT::emitWatchdogTimerCheck):
* jit/JIT.h:
(JSC::JIT::emit_op_loop_hint):
* jit/JITStubs.cpp:
(JSC::DEFINE_STUB_FUNCTION(void, handle_watchdog_timer)):
* jit/JITStubs.h:
* llint/LLIntExceptions.cpp:
(JSC::LLInt::doThrow):
- Factored out some common code from returnToThrow() and callToThrow().
(JSC::LLInt::returnToThrow):
(JSC::LLInt::callToThrow):
* llint/LLIntSlowPaths.cpp:
(JSC::LLInt::LLINT_SLOW_PATH_DECL(slow_path_handle_watchdog_timer)):
* llint/LLIntSlowPaths.h:
* llint/LowLevelInterpreter.asm:
* llint/LowLevelInterpreter32_64.asm:
* llint/LowLevelInterpreter64.asm:
* runtime/ExceptionHelpers.cpp:
(JSC::throwTerminatedExecutionException):
- Also removed the now unused InterruptedExecutionException.
* runtime/ExceptionHelpers.h:
* runtime/JSGlobalData.cpp:
(JSC::JSGlobalData::JSGlobalData):
* runtime/JSGlobalData.h:
- Added watchdog, and removed the now obsolete Terminator.
* runtime/Terminator.h: Removed.
* runtime/Watchdog.cpp: Added.
(JSC::Watchdog::Watchdog):
(JSC::Watchdog::~Watchdog):
(JSC::Watchdog::setTimeLimit):
(JSC::Watchdog::didFire):
(JSC::Watchdog::isEnabled):
(JSC::Watchdog::fire):
(JSC::Watchdog::arm):
(JSC::Watchdog::disarm):
(JSC::Watchdog::startCountdownIfNeeded):
(JSC::Watchdog::startCountdown):
(JSC::Watchdog::stopCountdown):
(JSC::Watchdog::Scope::Scope):
(JSC::Watchdog::Scope::~Scope):
* runtime/Watchdog.h: Added.
(Watchdog):
(JSC::Watchdog::didFire):
(JSC::Watchdog::timerDidFireAddress):
(JSC::Watchdog::isArmed):
(Watchdog::Scope):
* runtime/WatchdogMac.cpp: Added.
(JSC::Watchdog::initTimer):
(JSC::Watchdog::destroyTimer):
(JSC::Watchdog::startTimer):
(JSC::Watchdog::stopTimer):
* runtime/WatchdogNone.cpp: Added.
(JSC::Watchdog::initTimer):
(JSC::Watchdog::destroyTimer):
(JSC::Watchdog::startTimer):
(JSC::Watchdog::stopTimer):

Source/WebCore: Add LLINT and baseline JIT support for timing out scripts.
https://bugs.webkit.org/show_bug.cgi?id=114577.

Reviewed by Geoffrey Garen.

Replaced use of the obsolete JSGlobalData.terminator methods with the
JSGlobalData.watchdog equivalents.

* bindings/js/JSEventListener.cpp:
(WebCore::JSEventListener::handleEvent):
* bindings/js/SerializedScriptValue.cpp:
(WebCore::SerializedScriptValue::maybeThrowExceptionIfSerializationFailed):
* bindings/js/WorkerScriptController.cpp:
(WebCore::WorkerScriptController::evaluate):
(WebCore::WorkerScriptController::scheduleExecutionTermination):
(WebCore::WorkerScriptController::isExecutionTerminating):

Source/WTF: Added currentCPUTime() and currentCPUTimeMS().
https://bugs.webkit.org/show_bug.cgi?id=114577.

Reviewed by Geoffrey Garen.

The currentCPUTime() implementation came from the old TimeoutChecker.cpp.

* wtf/CurrentTime.cpp:
(WTF::currentCPUTime):
(WTF::currentCPUTimeMS):
* wtf/CurrentTime.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148639 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Unskip some tests for wk2 where the underlying cause of them being skipped has since been
fixed or the original issue does not reproduce.

* platform/wk2/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148640 268f45cc-cd09-0410-ab3c-d52691b4dbfc