WebKit/Source/JavaScriptCore/API/JSBase.cpp at main · WebKit/WebKit · GitHub

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* 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 APPLE INC. ``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 APPLE INC. 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 "config.h"

#include "JSBase.h"

#include "JSBaseInternal.h"

#include "JSBasePrivate.h"

#include "APICast.h"

#include "Completion.h"

#include "GCActivityCallback.h"

#include "JSCInlines.h"

#include "JSLock.h"

#include "ObjectConstructor.h"

#include "OpaqueJSString.h"

#include "SourceCode.h"

#if ENABLE(REMOTE_INSPECTOR)

#include "JSGlobalObjectInspectorController.h"

#endif

using namespace JSC;

JSValueRef JSEvaluateScriptInternal(const JSLockHolder&, JSContextRef ctx, JSObjectRef thisObject, const SourceCode& source, JSValueRef* exception)

{

JSObject* jsThisObject = toJS(thisObject);

// evaluate sets "this" to the global object if it is NULL

JSGlobalObject* globalObject = toJS(ctx);

NakedPtr<Exception> evaluationException;

JSValue returnValue = profiledEvaluate(globalObject, ProfilingReason::API, source, jsThisObject, evaluationException);

if (evaluationException) {

if (exception)

*exception = toRef(globalObject, evaluationException->value());

#if ENABLE(REMOTE_INSPECTOR)

// FIXME: If we have a debugger attached we could learn about ParseError exceptions through

// ScriptDebugServer::sourceParsed and this path could produce a duplicate warning. The

// Debugger path is currently ignored by inspector.

// NOTE: If we don't have a debugger, this SourceCode will be forever lost to the inspector.

// We could stash it in the inspector in case an inspector is ever opened.

protect(globalObject->inspectorController())->reportAPIException(globalObject, evaluationException);

#endif

return nullptr;

}

if (returnValue)

return toRef(globalObject, returnValue);

// happens, for example, when the only statement is an empty (';') statement

return toRef(globalObject, jsUndefined());

}

JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURLString, int startingLineNumber, JSValueRef* exception)

{

if (!ctx) {

ASSERT_NOT_REACHED();

return nullptr;

}

JSGlobalObject* globalObject = toJS(ctx);

VM& vm = globalObject->vm();

JSLockHolder locker(vm);

startingLineNumber = std::max(1, startingLineNumber);

auto sourceURL = sourceURLString ? URL({ }, sourceURLString->string()) : URL();

SourceCode source = makeSource(script->string(), SourceOrigin { sourceURL }, SourceTaintedOrigin::Untainted, sourceURL.string(), TextPosition(OrdinalNumber::fromOneBasedInt(startingLineNumber), OrdinalNumber()));

return JSEvaluateScriptInternal(locker, ctx, thisObject, source, exception);

}

bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURLString, int startingLineNumber, JSValueRef* exception)

{

if (!ctx) {

ASSERT_NOT_REACHED();

return false;

}

JSGlobalObject* globalObject = toJS(ctx);

VM& vm = globalObject->vm();

JSLockHolder locker(vm);

startingLineNumber = std::max(1, startingLineNumber);

auto sourceURL = sourceURLString ? URL({ }, sourceURLString->string()) : URL();

JSValue syntaxException;

bool isValidSyntax = checkSyntax(globalObject, source, &syntaxException);

if (!isValidSyntax) {

if (exception)

*exception = toRef(globalObject, syntaxException);

#if ENABLE(REMOTE_INSPECTOR)

Exception* exception = Exception::create(vm, syntaxException);

protect(globalObject->inspectorController())->reportAPIException(globalObject, exception);

#endif

return false;

}

return true;

}

void JSGarbageCollect(JSContextRef ctx)

{

// We used to recommend passing NULL as an argument here, which caused the only heap to be collected.

// As there is no longer a shared heap, the previously recommended usage became a no-op (but the GC

// will happen when the context group is destroyed).

// Because the function argument was originally ignored, some clients may pass their released context here,

// in which case there is a risk of crashing if another thread performs GC on the same heap in between.

if (!ctx)

return;

JSGlobalObject* globalObject = toJS(ctx);

VM& vm = globalObject->vm();

JSLockHolder locker(vm);

vm.heap.reportAbandonedObjectGraph();

}

void JSReportExtraMemoryCost(JSContextRef ctx, size_t size)

{

if (!ctx) {

ASSERT_NOT_REACHED();

return;

}

JSGlobalObject* globalObject = toJS(ctx);

VM& vm = globalObject->vm();

JSLockHolder locker(vm);

vm.heap.deprecatedReportExtraMemory(size);

}

extern "C" JS_EXPORT void JSSynchronousGarbageCollectForDebugging(JSContextRef);

extern "C" JS_EXPORT void JSSynchronousEdenCollectForDebugging(JSContextRef);

void JSSynchronousGarbageCollectForDebugging(JSContextRef ctx)

{

if (!ctx)

return;

JSGlobalObject* globalObject = toJS(ctx);

VM& vm = globalObject->vm();

JSLockHolder locker(vm);

vm.heap.collectNow(Sync, CollectionScope::Full);

}

void JSSynchronousEdenCollectForDebugging(JSContextRef ctx)

{

if (!ctx)

return;

JSGlobalObject* globalObject = toJS(ctx);

VM& vm = globalObject->vm();

JSLockHolder locker(vm);

vm.heap.collectSync(CollectionScope::Eden);

}

void JSDisableGCTimer(void)

{

GCActivityCallback::s_shouldCreateGCTimer = false;

}

#if !OS(DARWIN) && !OS(WINDOWS)

bool JSConfigureSignalForGC(int signal)

{

if (g_wtfConfig.isThreadSuspendResumeSignalConfigured)

return false;

g_wtfConfig.sigThreadSuspendResume = signal;

g_wtfConfig.isUserSpecifiedThreadSuspendResumeSignalConfigured = true;

return true;

}

#endif

JSObjectRef JSGetMemoryUsageStatistics(JSContextRef ctx)

{

if (!ctx) {

ASSERT_NOT_REACHED();

return nullptr;

}

JSGlobalObject* globalObject = toJS(ctx);

VM& vm = globalObject->vm();

JSLockHolder locker(vm);

auto typeCounts = vm.heap.objectTypeCounts();

JSObject* objectTypeCounts = constructEmptyObject(globalObject);

for (auto& it : typeCounts)

objectTypeCounts->putDirect(vm, Identifier::fromString(vm, it.key), jsNumber(it.value));

JSObject* object = constructEmptyObject(globalObject);

object->putDirect(vm, Identifier::fromString(vm, "heapSize"_s), jsNumber(vm.heap.size()));

object->putDirect(vm, Identifier::fromString(vm, "heapCapacity"_s), jsNumber(vm.heap.capacity()));

object->putDirect(vm, Identifier::fromString(vm, "extraMemorySize"_s), jsNumber(vm.heap.extraMemorySize()));

object->putDirect(vm, Identifier::fromString(vm, "objectCount"_s), jsNumber(vm.heap.objectCount()));

object->putDirect(vm, Identifier::fromString(vm, "protectedObjectCount"_s), jsNumber(vm.heap.protectedObjectCount()));

object->putDirect(vm, Identifier::fromString(vm, "globalObjectCount"_s), jsNumber(vm.heap.globalObjectCount()));

object->putDirect(vm, Identifier::fromString(vm, "protectedGlobalObjectCount"_s), jsNumber(vm.heap.protectedGlobalObjectCount()));

object->putDirect(vm, Identifier::fromString(vm, "objectTypeCounts"_s), objectTypeCounts);

return toRef(object);

}

WebKit/Source/JavaScriptCore/API/JSBase.cpp at main · WebKit/WebKit · GitHub

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