WebKit/Source/JavaScriptCore/API/glib/JSCContext.cpp at main · WebKit/WebKit · GitHub

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* This library is free software; you can redistribute it and/or

* modify it under the terms of the GNU Library General Public

* License as published by the Free Software Foundation; either

* version 2 of the License, or (at your option) any later version.

* This library is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* Library General Public License for more details.

* You should have received a copy of the GNU Library General Public License

* along with this library; see the file COPYING.LIB. If not, write to

* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

* Boston, MA 02110-1301, USA.

#include "config.h"

#include "JSCContext.h"

#include "APICast.h"

#include "IntegrityInlines.h"

#include "JSCClassPrivate.h"

#include "JSCContextInternal.h"

#include "JSCContextPrivate.h"

#include "JSCExceptionPrivate.h"

#include "JSCInlines.h"

#include "JSCValuePrivate.h"

#include "JSCVirtualMachinePrivate.h"

#include "JSCWrapperMap.h"

#include "JSRetainPtr.h"

#include "JSWithScope.h"

#include "OpaqueJSString.h"

#include "Parser.h"

#include <wtf/glib/GSpanExtras.h>

#include <wtf/glib/GUniquePtr.h>

#include <wtf/glib/WTFGType.h>

#include <wtf/text/MakeString.h>

/**

* JSCContext:

* @short_description: JavaScript execution context

* @title: JSCContext

* JSCContext represents a JavaScript execution context, where all operations

* take place and where the values will be associated.

* When a new context is created, a global object is allocated and the built-in JavaScript

* objects (Object, Function, String, Array) are populated. You can execute JavaScript in

* the context by using jsc_context_evaluate() or jsc_context_evaluate_with_source_uri().

* It's also possible to register custom objects in the context with jsc_context_register_class().

enum {

PROP_0,

PROP_VIRTUAL_MACHINE,

};

struct JSCContextExceptionHandler {

JSCContextExceptionHandler(JSCExceptionHandler handler, void* userData = nullptr, GDestroyNotify destroyNotifyFunction = nullptr)

: handler(handler)

, userData(userData)

, destroyNotifyFunction(destroyNotifyFunction)

{

}

~JSCContextExceptionHandler()

{

if (destroyNotifyFunction)

destroyNotifyFunction(userData);

}

JSCContextExceptionHandler(JSCContextExceptionHandler&& other)

{

std::swap(handler, other.handler);

std::swap(userData, other.userData);

std::swap(destroyNotifyFunction, other.destroyNotifyFunction);

}

JSCContextExceptionHandler(const JSCContextExceptionHandler&) = delete;

JSCContextExceptionHandler& operator=(const JSCContextExceptionHandler&) = delete;

JSCExceptionHandler handler { nullptr };

void* userData { nullptr };

GDestroyNotify destroyNotifyFunction { nullptr };

};

struct _JSCContextPrivate {

GRefPtr<JSCVirtualMachine> vm;

JSRetainPtr<JSGlobalContextRef> jsContext;

GRefPtr<JSCException> exception;

Vector<JSCContextExceptionHandler> exceptionHandlers;

};

WEBKIT_DEFINE_FINAL_TYPE(JSCContext, jsc_context, G_TYPE_OBJECT, GObject)

static void jscContextSetVirtualMachine(JSCContext* context, GRefPtr<JSCVirtualMachine>&& vm)

{

JSCContextPrivate* priv = context->priv;

if (vm) {

ASSERT(!priv->vm);

priv->vm = WTF::move(vm);

ASSERT(!priv->jsContext);

GUniquePtr<char> name(g_strdup_printf("%p-jsContext", &Thread::currentSingleton()));

if (auto* data = g_object_get_data(G_OBJECT(priv->vm.get()), name.get())) {

priv->jsContext = static_cast<JSGlobalContextRef>(data);

g_object_set_data(G_OBJECT(priv->vm.get()), name.get(), nullptr);

} else

priv->jsContext = JSRetainPtr<JSGlobalContextRef>(Adopt, JSGlobalContextCreateInGroup(jscVirtualMachineGetContextGroup(priv->vm.get()), nullptr));

auto* globalObject = toJSGlobalObject(priv->jsContext.get());

if (!globalObject->wrapperMap())

globalObject->setWrapperMap(makeUnique<JSC::WrapperMap>(priv->jsContext.get()));

jscVirtualMachineAddContext(priv->vm.get(), context);

} else if (priv->vm) {

ASSERT(priv->jsContext);

jscVirtualMachineRemoveContext(priv->vm.get(), context);

priv->jsContext = nullptr;

priv->vm = nullptr;

}

static void jscContextGetProperty(GObject* object, guint propID, GValue* value, GParamSpec* paramSpec)

{

JSCContextPrivate* priv = JSC_CONTEXT(object)->priv;

switch (propID) {

case PROP_VIRTUAL_MACHINE:

g_value_set_object(value, priv->vm.get());

break;

default:

G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propID, paramSpec);

}

static void jscContextSetProperty(GObject* object, guint propID, const GValue* value, GParamSpec* paramSpec)

{

JSCContext* context = JSC_CONTEXT(object);

switch (propID) {

case PROP_VIRTUAL_MACHINE:

if (gpointer vm = g_value_get_object(value))

jscContextSetVirtualMachine(context, GRefPtr<JSCVirtualMachine>(JSC_VIRTUAL_MACHINE(vm)));

break;

default:

G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propID, paramSpec);

}

static void jscContextConstructed(GObject* object)

{

G_OBJECT_CLASS(jsc_context_parent_class)->constructed(object);

JSCContext* context = JSC_CONTEXT(object);

if (!context->priv->vm)

jscContextSetVirtualMachine(context, adoptGRef(jsc_virtual_machine_new()));

context->priv->exceptionHandlers.append(JSCContextExceptionHandler([](JSCContext* context, JSCException* exception, gpointer) {

jsc_context_throw_exception(context, exception);

}));

}

static void jscContextDispose(GObject* object)

{

JSCContext* context = JSC_CONTEXT(object);

jscContextSetVirtualMachine(context, nullptr);

G_OBJECT_CLASS(jsc_context_parent_class)->dispose(object);

}

static void jsc_context_class_init(JSCContextClass* klass)

{

GObjectClass* objClass = G_OBJECT_CLASS(klass);

objClass->get_property = jscContextGetProperty;

objClass->set_property = jscContextSetProperty;

objClass->constructed = jscContextConstructed;

objClass->dispose = jscContextDispose;

/**

* JSCContext:virtual-machine:

* The #JSCVirtualMachine in which the context was created.

g_object_class_install_property(objClass,

PROP_VIRTUAL_MACHINE,

g_param_spec_object(

"virtual-machine",

nullptr, nullptr,

JSC_TYPE_VIRTUAL_MACHINE,

static_cast<GParamFlags>(WEBKIT_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY)));

}

GRefPtr<JSCContext> jscContextGetOrCreate(JSGlobalContextRef jsContext)

{

auto vm = jscVirtualMachineGetOrCreate(toRef(&toJS(jsContext)->vm()));

if (GRefPtr<JSCContext> context = jscVirtualMachineGetContext(vm.get(), jsContext))

return context;

GUniquePtr<char> name(g_strdup_printf("%p-jsContext", &Thread::currentSingleton()));

g_object_set_data(G_OBJECT(vm.get()), name.get(), jsContext);

return adoptGRef(jsc_context_new_with_virtual_machine(vm.get()));

}

JSGlobalContextRef jscContextGetJSContext(JSCContext* context)

{

ASSERT(JSC_IS_CONTEXT(context));

JSCContextPrivate* priv = context->priv;

return priv->jsContext.get();

}

static JSC::WrapperMap& wrapperMap(JSCContext* context)

{

auto* map = toJSGlobalObject(context->priv->jsContext.get())->wrapperMap();

ASSERT(map);

return *map;

}

GRefPtr<JSCValue> jscContextGetOrCreateValue(JSCContext* context, JSValueRef jsValue)

{

return wrapperMap(context).gobjectWrapper(context, jsValue);

}

void jscContextValueDestroyed(JSCContext* context, JSValueRef jsValue)

{

wrapperMap(context).unwrap(jsValue);

}

JSC::JSObject* jscContextGetJSWrapper(JSCContext* context, gpointer wrappedObject)

{

return wrapperMap(context).jsWrapper(wrappedObject);

}

JSC::JSObject* jscContextGetOrCreateJSWrapper(JSCContext* context, JSClassRef jsClass, JSValueRef prototype, gpointer wrappedObject, GDestroyNotify destroyFunction)

{

if (auto* jsWrapper = jscContextGetJSWrapper(context, wrappedObject))

return jsWrapper;

return wrapperMap(context).createJSWrapper(context->priv->jsContext.get(), jsClass, prototype, wrappedObject, destroyFunction);

}

JSGlobalContextRef jscContextCreateContextWithJSWrapper(JSCContext* context, JSClassRef jsClass, JSValueRef prototype, gpointer wrappedObject, GDestroyNotify destroyFunction)

{

return wrapperMap(context).createContextWithJSWrapper(jscVirtualMachineGetContextGroup(context->priv->vm.get()), jsClass, prototype, wrappedObject, destroyFunction);

}

gpointer jscContextWrappedObject(JSCContext* context, JSObjectRef jsObject)

{

return wrapperMap(context).wrappedObject(context->priv->jsContext.get(), jsObject);

}

JSCClass* jscContextGetRegisteredClass(JSCContext* context, JSClassRef jsClass)

{

return wrapperMap(context).registeredClass(jsClass);

}

CallbackData jscContextPushCallback(JSCContext* context, JSValueRef calleeValue, JSValueRef thisValue, size_t argumentCount, const JSValueRef* arguments)

{

auto& thread = Thread::currentSingleton();

auto* previousStack = static_cast<CallbackData*>(thread.m_apiData);

CallbackData data = { context, WTF::move(context->priv->exception), calleeValue, thisValue, argumentCount, arguments, previousStack };

thread.m_apiData = &data;

return data;

}

void jscContextPopCallback(JSCContext* context, CallbackData&& data)

{

auto& thread = Thread::currentSingleton();

context->priv->exception = WTF::move(data.preservedException);

thread.m_apiData = data.next;

}

JSValueRef jscContextGArrayToJSArray(JSCContext* context, GPtrArray* gArray, JSValueRef* exception)

{

JSCContextPrivate* priv = context->priv;

JSC::JSGlobalObject* globalObject = toJS(priv->jsContext.get());

JSC::JSLockHolder locker(globalObject);

auto* jsArray = JSObjectMakeArray(priv->jsContext.get(), 0, nullptr, exception);

if (*exception)

return JSValueMakeUndefined(priv->jsContext.get());

if (!gArray)

return jsArray;

auto* jsArrayObject = JSValueToObject(priv->jsContext.get(), jsArray, exception);

if (*exception)

return JSValueMakeUndefined(priv->jsContext.get());

auto i = 0;

for (auto& item : span(gArray)) {

if (!item)

JSObjectSetPropertyAtIndex(priv->jsContext.get(), jsArrayObject, i, JSValueMakeNull(priv->jsContext.get()), exception);

else if (JSC_IS_VALUE(item))

JSObjectSetPropertyAtIndex(priv->jsContext.get(), jsArrayObject, i, jscValueGetJSValue(JSC_VALUE(item)), exception);

else

*exception = toRef(JSC::createTypeError(globalObject, "invalid item type in GPtrArray"_s));

if (*exception)

return JSValueMakeUndefined(priv->jsContext.get());

i++;

}

return jsArray;

}

static GRefPtr<GPtrArray> jscContextJSArrayToGArray(JSCContext* context, JSValueRef jsArray, JSValueRef* exception)

{

JSCContextPrivate* priv = context->priv;

JSC::JSGlobalObject* globalObject = toJS(priv->jsContext.get());

JSC::JSLockHolder locker(globalObject);

if (JSValueIsNull(priv->jsContext.get(), jsArray))

return nullptr;

if (!JSValueIsArray(priv->jsContext.get(), jsArray)) {

*exception = toRef(JSC::createTypeError(globalObject, "invalid js type for GPtrArray"_s));

return nullptr;

}

auto* jsArrayObject = JSValueToObject(priv->jsContext.get(), jsArray, exception);

if (*exception)

return nullptr;

JSRetainPtr<JSStringRef> lengthString(Adopt, JSStringCreateWithUTF8CString("length"));

auto* jsLength = JSObjectGetProperty(priv->jsContext.get(), jsArrayObject, lengthString.get(), exception);

if (*exception)

return nullptr;

auto length = JSC::toUInt32(JSValueToNumber(priv->jsContext.get(), jsLength, exception));

if (*exception)

return nullptr;

GRefPtr<GPtrArray> gArray = adoptGRef(g_ptr_array_new_with_free_func(g_object_unref));

for (unsigned i = 0; i < length; ++i) {

auto* jsItem = JSObjectGetPropertyAtIndex(priv->jsContext.get(), jsArrayObject, i, exception);

if (*exception)

return nullptr;

g_ptr_array_add(gArray.get(), jsItem ? jscContextGetOrCreateValue(context, jsItem).leakRef() : nullptr);

}

return gArray;

}

GUniquePtr<char*> jscContextJSArrayToGStrv(JSCContext* context, JSValueRef jsArray, JSValueRef* exception)

{

JSCContextPrivate* priv = context->priv;

JSC::JSGlobalObject* globalObject = toJS(priv->jsContext.get());

JSC::JSLockHolder locker(globalObject);

if (JSValueIsNull(priv->jsContext.get(), jsArray))

return nullptr;

if (!JSValueIsArray(priv->jsContext.get(), jsArray)) {

*exception = toRef(JSC::createTypeError(globalObject, "invalid js type for GStrv"_s));

return nullptr;

}

auto* jsArrayObject = JSValueToObject(priv->jsContext.get(), jsArray, exception);

if (*exception)

return nullptr;

JSRetainPtr<JSStringRef> lengthString(Adopt, JSStringCreateWithUTF8CString("length"));

auto* jsLength = JSObjectGetProperty(priv->jsContext.get(), jsArrayObject, lengthString.get(), exception);

if (*exception)

return nullptr;

auto length = JSC::toUInt32(JSValueToNumber(priv->jsContext.get(), jsLength, exception));

if (*exception)

return nullptr;

auto sizeInBytes = checkedSum<size_t>(length, 1);

sizeInBytes *= sizeof(char*);

if (sizeInBytes.hasOverflowed())

return nullptr;

auto strv = GMallocSpan<char*>::zeroedMalloc(sizeInBytes);

for (unsigned i = 0; i < length; ++i) {

auto* jsItem = JSObjectGetPropertyAtIndex(priv->jsContext.get(), jsArrayObject, i, exception);

if (*exception)

return nullptr;

auto jsValueItem = jscContextGetOrCreateValue(context, jsItem);

if (!jsc_value_is_string(jsValueItem.get())) {

*exception = toRef(JSC::createTypeError(globalObject, makeString("invalid js type for GStrv: item "_s, i, " is not a string"_s)));

return nullptr;

}

strv[i] = jsc_value_to_string(jsValueItem.get());

}

return GUniquePtr<char*> { strv.leakSpan().data() };

}

JSValueRef jscContextGValueToJSValue(JSCContext* context, const GValue* value, JSValueRef* exception)

{

JSCContextPrivate* priv = context->priv;

JSC::JSGlobalObject* globalObject = toJS(priv->jsContext.get());

JSC::JSLockHolder locker(globalObject);

switch (g_type_fundamental(G_VALUE_TYPE(value))) {

case G_TYPE_BOOLEAN:

return JSValueMakeBoolean(priv->jsContext.get(), g_value_get_boolean(value));

case G_TYPE_CHAR:

case G_TYPE_INT:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_int);

case G_TYPE_ENUM:

return JSValueMakeNumber(priv->jsContext.get(), g_value_get_enum(value));

case G_TYPE_FLAGS:

return JSValueMakeNumber(priv->jsContext.get(), g_value_get_flags(value));

case G_TYPE_UCHAR:

case G_TYPE_UINT:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_uint);

case G_TYPE_FLOAT:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_float);

case G_TYPE_DOUBLE:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_double);

case G_TYPE_LONG:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_long);

case G_TYPE_ULONG:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_ulong);

case G_TYPE_INT64:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_int64);

case G_TYPE_UINT64:

return JSValueMakeNumber(priv->jsContext.get(), value->data[0].v_uint64);

case G_TYPE_STRING:

if (const char* stringValue = g_value_get_string(value)) {

JSRetainPtr<JSStringRef> jsString(Adopt, JSStringCreateWithUTF8CString(stringValue));

return JSValueMakeString(priv->jsContext.get(), jsString.get());

}

return JSValueMakeNull(priv->jsContext.get());

case G_TYPE_POINTER:

case G_TYPE_OBJECT:

case G_TYPE_BOXED:

if (auto* ptr = value->data[0].v_pointer) {

if (auto* jsWrapper = jscContextGetJSWrapper(context, ptr))

return toRef(jsWrapper);

if (g_type_is_a(G_VALUE_TYPE(value), JSC_TYPE_VALUE))

return jscValueGetJSValue(JSC_VALUE(ptr));

if (g_type_is_a(G_VALUE_TYPE(value), JSC_TYPE_EXCEPTION))

return jscExceptionGetJSValue(JSC_EXCEPTION(ptr));

if (g_type_is_a(G_VALUE_TYPE(value), G_TYPE_PTR_ARRAY))

return jscContextGArrayToJSArray(context, static_cast<GPtrArray*>(ptr), exception);

if (g_type_is_a(G_VALUE_TYPE(value), G_TYPE_STRV)) {

auto items = span(static_cast<char**>(ptr));

GRefPtr<GPtrArray> gArray = adoptGRef(g_ptr_array_new_full(items.size(), g_object_unref));

for (auto* item : items)

g_ptr_array_add(gArray.get(), jsc_value_new_string(context, item));

return jscContextGArrayToJSArray(context, gArray.get(), exception);

}

} else

return JSValueMakeNull(priv->jsContext.get());

break;

case G_TYPE_PARAM:

case G_TYPE_INTERFACE:

case G_TYPE_VARIANT:

default:

break;

}

*exception = toRef(JSC::createTypeError(globalObject, makeString("unsupported type "_s, unsafeSpan(g_type_name(G_VALUE_TYPE(value))))));

return JSValueMakeUndefined(priv->jsContext.get());

}

static inline gpointer jscContextJSValueToWrappedObject(JSCContext* context, JSValueRef jsValue)

{

auto jsObject = JSValueToObject(context->priv->jsContext.get(), jsValue, nullptr);

return jsObject ? jscContextWrappedObject(context, jsObject) : nullptr;

}

void jscContextJSValueToGValue(JSCContext* context, JSValueRef jsValue, GType type, GValue* value, JSValueRef* exception)

{

JSCContextPrivate* priv = context->priv;

JSC::JSGlobalObject* globalObject = toJS(priv->jsContext.get());

JSC::JSLockHolder locker(globalObject);

g_value_init(value, type);

auto fundamentalType = g_type_fundamental(G_VALUE_TYPE(value));

switch (fundamentalType) {

case G_TYPE_INT:

g_value_set_int(value, JSC::toInt32(JSValueToNumber(priv->jsContext.get(), jsValue, exception)));

break;

case G_TYPE_FLOAT:

g_value_set_float(value, JSValueToNumber(priv->jsContext.get(), jsValue, exception));

break;

case G_TYPE_DOUBLE:

g_value_set_double(value, JSValueToNumber(priv->jsContext.get(), jsValue, exception));

break;

case G_TYPE_BOOLEAN:

g_value_set_boolean(value, JSValueToBoolean(priv->jsContext.get(), jsValue));

break;

case G_TYPE_STRING:

if (!JSValueIsNull(priv->jsContext.get(), jsValue)) {

JSRetainPtr<JSStringRef> jsString(Adopt, JSValueToStringCopy(priv->jsContext.get(), jsValue, exception));

if (*exception)

return;

size_t maxSize = JSStringGetMaximumUTF8CStringSize(jsString.get());

auto* string = static_cast<char*>(g_malloc(maxSize));

JSStringGetUTF8CString(jsString.get(), string, maxSize);

g_value_take_string(value, string);

} else

g_value_set_string(value, nullptr);

break;

case G_TYPE_CHAR:

g_value_set_schar(value, JSC::toInt32(JSValueToNumber(priv->jsContext.get(), jsValue, exception)));

break;

case G_TYPE_UCHAR:

g_value_set_uchar(value, JSC::toUInt32(JSValueToNumber(priv->jsContext.get(), jsValue, exception)));

break;

case G_TYPE_UINT:

g_value_set_uint(value, JSC::toUInt32(JSValueToNumber(priv->jsContext.get(), jsValue, exception)));

break;

case G_TYPE_POINTER:

case G_TYPE_OBJECT:

case G_TYPE_BOXED: {

gpointer wrappedObject = jscContextJSValueToWrappedObject(context, jsValue);

if (!wrappedObject) {

if (g_type_is_a(G_VALUE_TYPE(value), JSC_TYPE_VALUE)) {

auto jscValue = jscContextGetOrCreateValue(context, jsValue);

g_value_set_object(value, jscValue.get());

return;

}

if (g_type_is_a(G_VALUE_TYPE(value), JSC_TYPE_EXCEPTION)) {

auto exception = jscExceptionCreate(context, jsValue);

g_value_set_object(value, exception.get());

return;

}

if (g_type_is_a(G_VALUE_TYPE(value), G_TYPE_PTR_ARRAY)) {

auto gArray = jscContextJSArrayToGArray(context, jsValue, exception);

if (!*exception)

g_value_take_boxed(value, gArray.leakRef());

return;

}

if (g_type_is_a(G_VALUE_TYPE(value), G_TYPE_STRV)) {

auto strv = jscContextJSArrayToGStrv(context, jsValue, exception);

if (!*exception)

g_value_take_boxed(value, strv.release());

return;

}

*exception = toRef(JSC::createTypeError(globalObject, "invalid pointer type"_s));

return;

}

if (fundamentalType == G_TYPE_POINTER)

g_value_set_pointer(value, wrappedObject);

else if (fundamentalType == G_TYPE_BOXED)

g_value_set_boxed(value, wrappedObject);

else if (G_IS_OBJECT(wrappedObject))

g_value_set_object(value, wrappedObject);

else

*exception = toRef(JSC::createTypeError(globalObject, "wrapped object is not a GObject"_s));

break;

}

case G_TYPE_LONG:

g_value_set_long(value, JSValueToNumber(priv->jsContext.get(), jsValue, exception));

break;

case G_TYPE_ULONG:

g_value_set_ulong(value, JSValueToNumber(priv->jsContext.get(), jsValue, exception));

break;

case G_TYPE_INT64:

g_value_set_int64(value, JSValueToNumber(priv->jsContext.get(), jsValue, exception));

break;

case G_TYPE_UINT64:

g_value_set_uint64(value, JSValueToNumber(priv->jsContext.get(), jsValue, exception));

break;

case G_TYPE_ENUM:

g_value_set_enum(value, JSC::toInt32(JSValueToNumber(priv->jsContext.get(), jsValue, exception)));

break;

case G_TYPE_FLAGS:

g_value_set_flags(value, JSC::toInt32(JSValueToNumber(priv->jsContext.get(), jsValue, exception)));

break;

case G_TYPE_PARAM:

case G_TYPE_INTERFACE:

case G_TYPE_VARIANT:

default:

*exception = toRef(JSC::createTypeError(globalObject, makeString("unsupported type "_s, unsafeSpan(g_type_name(G_VALUE_TYPE(value))))));

break;

}

void jscContextGarbageCollect(JSCContext* context, bool sanitizeStack)

{

auto* jsContext = context->priv->jsContext.get();

JSC::JSGlobalObject* globalObject = toJS(jsContext);

Ref vm = globalObject->vm();

JSC::JSLockHolder locker(vm);

if (sanitizeStack)

sanitizeStackForVM(vm);

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

}

/**

* jsc_context_new:

* Create a new #JSCContext. The context is created in a new #JSCVirtualMachine.

* Use jsc_context_new_with_virtual_machine() to create a new #JSCContext in an

* existing #JSCVirtualMachine.

* Returns: (transfer full): the newly created #JSCContext.

JSCContext* jsc_context_new()

{

return JSC_CONTEXT(g_object_new(JSC_TYPE_CONTEXT, nullptr));

}

/**

* jsc_context_new_with_virtual_machine:

* @vm: a #JSCVirtualMachine

* Create a new #JSCContext in @virtual_machine.

* Returns: (transfer full): the newly created #JSCContext.

JSCContext* jsc_context_new_with_virtual_machine(JSCVirtualMachine* vm)

{

g_return_val_if_fail(JSC_IS_VIRTUAL_MACHINE(vm), nullptr);

return JSC_CONTEXT(g_object_new(JSC_TYPE_CONTEXT, "virtual-machine", vm, nullptr));

}

/**

* jsc_context_get_virtual_machine:

* @context: a #JSCContext

* Get the #JSCVirtualMachine where @context was created.

* Returns: (transfer none): the #JSCVirtualMachine where the #JSCContext was created.

JSCVirtualMachine* jsc_context_get_virtual_machine(JSCContext* context)

{

g_return_val_if_fail(JSC_IS_CONTEXT(context), nullptr);

return context->priv->vm.get();

}

/**

* jsc_context_get_exception:

* @context: a #JSCContext

* Get the last unhandled exception thrown in @context by API functions calls.

* Returns: (transfer none) (nullable): a #JSCException or %NULL if there isn't any

* unhandled exception in the #JSCContext.

JSCException* jsc_context_get_exception(JSCContext *context)

{

g_return_val_if_fail(JSC_IS_CONTEXT(context), nullptr);

return context->priv->exception.get();

}

/**

* jsc_context_throw:

* @context: a #JSCContext

* @error_message: an error message

* Throw an exception to @context using the given error message. The created #JSCException

* can be retrieved with jsc_context_get_exception().

void jsc_context_throw(JSCContext* context, const char* errorMessage)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

context->priv->exception = adoptGRef(jsc_exception_new(context, errorMessage));

}

/**

* jsc_context_throw_printf:

* @context: a #JSCContext

* @format: the string format

* @...: the parameters to insert into the format string

* Throw an exception to @context using the given formatted string as error message.

* The created #JSCException can be retrieved with jsc_context_get_exception().

void jsc_context_throw_printf(JSCContext* context, const char* format, ...)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

va_list args;

va_start(args, format);

context->priv->exception = adoptGRef(jsc_exception_new_vprintf(context, format, args));

va_end(args);

}

/**

* jsc_context_throw_with_name:

* @context: a #JSCContext

* @error_name: the error name

* @error_message: an error message

* Throw an exception to @context using the given error name and message. The created #JSCException

* can be retrieved with jsc_context_get_exception().

void jsc_context_throw_with_name(JSCContext* context, const char* errorName, const char* errorMessage)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

g_return_if_fail(errorName);

context->priv->exception = adoptGRef(jsc_exception_new_with_name(context, errorName, errorMessage));

}

/**

* jsc_context_throw_with_name_printf:

* @context: a #JSCContext

* @error_name: the error name

* @format: the string format

* @...: the parameters to insert into the format string

* Throw an exception to @context using the given error name and the formatted string as error message.

* The created #JSCException can be retrieved with jsc_context_get_exception().

void jsc_context_throw_with_name_printf(JSCContext* context, const char* errorName, const char* format, ...)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

va_list args;

va_start(args, format);

context->priv->exception = adoptGRef(jsc_exception_new_with_name_vprintf(context, errorName, format, args));

va_end(args);

}

/**

* jsc_context_throw_exception:

* @context: a #JSCContext

* @exception: a #JSCException

* Throw @exception to @context.

void jsc_context_throw_exception(JSCContext* context, JSCException* exception)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

g_return_if_fail(JSC_IS_EXCEPTION(exception));

context->priv->exception = exception;

}

/**

* jsc_context_clear_exception:

* @context: a #JSCContext

* Clear the uncaught exception in @context if any.

void jsc_context_clear_exception(JSCContext* context)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

context->priv->exception = nullptr;

}

/**

* JSCExceptionHandler:

* @context: a #JSCContext

* @exception: a #JSCException

* @user_data: (closure): user data

* Function used to handle JavaScript exceptions in a #JSCContext.

/**

* jsc_context_push_exception_handler:

* @context: a #JSCContext

* @handler: (closure user_data): a #JSCExceptionHandler

* @user_data: user data to pass to @handler

* @destroy_notify: (nullable): destroy notifier for @user_data

* Push an exception handler in @context. Whenever a JavaScript exception happens in

* the #JSCContext, the given @handler will be called. The default #JSCExceptionHandler

* simply calls jsc_context_throw_exception() to throw the exception to the #JSCContext.

* If you don't want to catch the exception, but only get notified about it, call

* jsc_context_throw_exception() in @handler like the default one does.

* The last exception handler pushed is the only one used by the #JSCContext, use

* jsc_context_pop_exception_handler() to remove it and set the previous one. When @handler

* is removed from the context, @destroy_notify is called with @user_data as parameter.

void jsc_context_push_exception_handler(JSCContext* context, JSCExceptionHandler handler, gpointer userData, GDestroyNotify destroyNotify)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

g_return_if_fail(handler);

context->priv->exceptionHandlers.append({ handler, userData, destroyNotify });

}

/**

* jsc_context_pop_exception_handler:

* @context: a #JSCContext

* Remove the last #JSCExceptionHandler previously pushed to @context with

* jsc_context_push_exception_handler().

void jsc_context_pop_exception_handler(JSCContext* context)

{

g_return_if_fail(JSC_IS_CONTEXT(context));

g_return_if_fail(context->priv->exceptionHandlers.size() > 1);

context->priv->exceptionHandlers.removeLast();

}

bool jscContextHandleExceptionIfNeeded(JSCContext* context, JSValueRef jsException)

{

if (!jsException)

return false;

auto exception = jscExceptionCreate(context, jsException);

ASSERT(!context->priv->exceptionHandlers.isEmpty());

const auto& exceptionHandler = context->priv->exceptionHandlers.last();

exceptionHandler.handler(context, exception.get(), exceptionHandler.userData);

return true;

}

/**

* jsc_context_get_current:

* Get the #JSCContext that is currently executing a function. This should only be

* called within a function or method callback, otherwise %NULL will be returned.

* Returns: (transfer none) (nullable): the #JSCContext that is currently executing.

JSCContext* jsc_context_get_current()

{

auto* data = static_cast<CallbackData*>(Thread::currentSingleton().m_apiData);

return data ? data->context.get() : nullptr;

}

/**

* jsc_context_evaluate:

* @context: a #JSCContext

* @code: a JavaScript script to evaluate

* @length: length of @code, or -1 if @code is a nul-terminated string

* Evaluate @code in @context.

* Returns: (transfer full): a #JSCValue representing the last value generated by the script.

JSCValue* jsc_context_evaluate(JSCContext* context, const char* code, gssize length)

{

return jsc_context_evaluate_with_source_uri(context, code, length, nullptr, 0);

}

static JSValueRef evaluateScriptInContext(JSGlobalContextRef jsContext, String&& script, const char* uri, unsigned lineNumber, JSValueRef* exception)

{

JSRetainPtr<JSStringRef> scriptJS(Adopt, OpaqueJSString::tryCreate(WTF::move(script)).leakRef());

JSRetainPtr<JSStringRef> sourceURI = uri ? adopt(JSStringCreateWithUTF8CString(uri)) : nullptr;

return JSEvaluateScript(jsContext, scriptJS.get(), nullptr, sourceURI.get(), lineNumber, exception);

}

/**

* jsc_context_evaluate_with_source_uri:

* @context: a #JSCContext

* @code: a JavaScript script to evaluate

* @length: length of @code, or -1 if @code is a nul-terminated string

* @uri: the source URI

* @line_number: the starting line number

* Evaluate @code in @context using @uri as the source URI. The @line_number is the starting line number

* in @uri; the value is one-based so the first line is 1. @uri and @line_number will be shown in exceptions and

* they don't affect the behavior of the script.

* Returns: (transfer full): a #JSCValue representing the last value generated by the script.

JSCValue* jsc_context_evaluate_with_source_uri(JSCContext* context, const char* code, gssize length, const char* uri, unsigned lineNumber)

{

g_return_val_if_fail(JSC_IS_CONTEXT(context), nullptr);

g_return_val_if_fail(code, nullptr);

JSValueRef exception = nullptr;

JSValueRef result = evaluateScriptInContext(context->priv->jsContext.get(), length < 0 ? String::fromUTF8(code) : String::fromUTF8(unsafeMakeSpan(code, length)), uri, lineNumber, &exception);

if (jscContextHandleExceptionIfNeeded(context, exception))

return jsc_value_new_undefined(context);

return jscContextGetOrCreateValue(context, result).leakRef();

}

/**

* jsc_context_evaluate_in_object:

* @context: a #JSCContext

* @code: a JavaScript script to evaluate

* @length: length of @code, or -1 if @code is a nul-terminated string

* @object_instance: (nullable): an object instance

* @object_class: (nullable): a #JSCClass or %NULL to use the default

* @uri: the source URI

* @line_number: the starting line number

* @object: (out) (transfer full): return location for a #JSCValue.

* Evaluate @code and create an new object where symbols defined in @code will be added as properties,

* instead of being added to @context global object. The new object is returned as @object parameter.

* Similar to how jsc_value_new_object() works, if @object_instance is not %NULL @object_class must be provided too.

* The @line_number is the starting line number in @uri; the value is one-based so the first line is 1.

* @uri and @line_number will be shown in exceptions and they don't affect the behavior of the script.

* Returns: (transfer full): a #JSCValue representing the last value generated by the script.

JSCValue* jsc_context_evaluate_in_object(JSCContext* context, const char* code, gssize length, gpointer instance, JSCClass* objectClass, const char* uri, unsigned lineNumber, JSCValue** object)

{

g_return_val_if_fail(JSC_IS_CONTEXT(context), nullptr);

g_return_val_if_fail(code, nullptr);

g_return_val_if_fail(!instance || JSC_IS_CLASS(objectClass), nullptr);

g_return_val_if_fail(object && !*object, nullptr);

JSRetainPtr<JSGlobalContextRef> objectContext(Adopt,

instance ? jscClassCreateContextWithJSWrapper(objectClass, context, instance) : JSGlobalContextCreateInGroup(jscVirtualMachineGetContextGroup(context->priv->vm.get()), nullptr));

JSC::JSGlobalObject* globalObject = toJS(objectContext.get());

Ref vm = globalObject->vm();

JSC::JSLockHolder locker(globalObject);

globalObject->setGlobalScopeExtension(JSC::JSWithScope::create(vm, globalObject, globalObject->globalScope(), toJS(JSContextGetGlobalObject(context->priv->jsContext.get()))));

JSValueRef exception = nullptr;

JSValueRef result = evaluateScriptInContext(objectContext.get(), length < 0 ? String::fromUTF8(code) : String::fromUTF8(unsafeMakeSpan(code, length)), uri, lineNumber, &exception);

if (jscContextHandleExceptionIfNeeded(context, exception))

return jsc_value_new_undefined(context);

*object = jscContextGetOrCreateValue(context, JSContextGetGlobalObject(objectContext.get())).leakRef();

return jscContextGetOrCreateValue(context, result).leakRef();

}

/**

* JSCCheckSyntaxMode:

* @JSC_CHECK_SYNTAX_MODE_SCRIPT: mode to check syntax of a script

* @JSC_CHECK_SYNTAX_MODE_MODULE: mode to check syntax of a module

* Enum values to specify a mode to check for syntax errors in jsc_context_check_syntax().

/**

* JSCCheckSyntaxResult:

* @JSC_CHECK_SYNTAX_RESULT_SUCCESS: no errors

* @JSC_CHECK_SYNTAX_RESULT_RECOVERABLE_ERROR: recoverable syntax error

* @JSC_CHECK_SYNTAX_RESULT_IRRECOVERABLE_ERROR: irrecoverable syntax error

* @JSC_CHECK_SYNTAX_RESULT_UNTERMINATED_LITERAL_ERROR: unterminated literal error

* @JSC_CHECK_SYNTAX_RESULT_OUT_OF_MEMORY_ERROR: out of memory error

* @JSC_CHECK_SYNTAX_RESULT_STACK_OVERFLOW_ERROR: stack overflow error

* Enum values to specify the result of jsc_context_check_syntax().

/**

* jsc_context_check_syntax:

* @context: a #JSCContext

* @code: a JavaScript script to check

* @length: length of @code, or -1 if @code is a nul-terminated string

* @mode: a #JSCCheckSyntaxMode

* @uri: the source URI

* @line_number: the starting line number

* @exception: (out) (optional) (transfer full): return location for a #JSCException, or %NULL to ignore

* Check the given @code in @context for syntax errors. The @line_number is the starting line number in @uri;

* the value is one-based so the first line is 1. @uri and @line_number are only used to fill the @exception.

* In case of errors @exception will be set to a new #JSCException with the details. You can pass %NULL to

* @exception to ignore the error details.

* Returns: a #JSCCheckSyntaxResult

JSCCheckSyntaxResult jsc_context_check_syntax(JSCContext* context, const char* code, gssize length, JSCCheckSyntaxMode mode, const char* uri, unsigned lineNumber, JSCException **exception)

{

g_return_val_if_fail(JSC_IS_CONTEXT(context), JSC_CHECK_SYNTAX_RESULT_IRRECOVERABLE_ERROR);

g_return_val_if_fail(code, JSC_CHECK_SYNTAX_RESULT_IRRECOVERABLE_ERROR);

g_return_val_if_fail(!exception || !*exception, JSC_CHECK_SYNTAX_RESULT_IRRECOVERABLE_ERROR);

lineNumber = std::max<unsigned>(1, lineNumber);

auto* jsContext = context->priv->jsContext.get();

JSC::JSGlobalObject* globalObject = toJS(jsContext);

Ref vm = globalObject->vm();

JSC::JSLockHolder locker(vm);

URL sourceURL = uri ? URL(String::fromLatin1(uri)) : URL();

JSC::SourceCode source = JSC::makeSource(length < 0 ? String::fromUTF8(code) : String::fromUTF8(unsafeMakeSpan(code, length)), JSC::SourceOrigin { sourceURL }, JSC::SourceTaintedOrigin::Untainted,

sourceURL.string() , TextPosition(OrdinalNumber::fromOneBasedInt(lineNumber), OrdinalNumber()));

bool success = false;

JSC::ParserError error;

switch (mode) {

case JSC_CHECK_SYNTAX_MODE_SCRIPT:

success = !!JSC::parse<JSC::ProgramNode>(vm, source, JSC::Identifier(), JSC::ImplementationVisibility::Public, JSC::JSParserBuiltinMode::NotBuiltin,

JSC::NoLexicallyScopedFeatures, JSC::JSParserScriptMode::Classic, JSC::SourceParseMode::ProgramMode, JSC::FunctionMode::None, JSC::SuperBinding::NotNeeded, error);

break;

case JSC_CHECK_SYNTAX_MODE_MODULE:

success = !!JSC::parse<JSC::ModuleProgramNode>(vm, source, JSC::Identifier(), JSC::ImplementationVisibility::Public, JSC::JSParserBuiltinMode::NotBuiltin,

JSC::StrictModeLexicallyScopedFeature, JSC::JSParserScriptMode::Module, JSC::SourceParseMode::ModuleAnalyzeMode, JSC::FunctionMode::None, JSC::SuperBinding::NotNeeded, error);

break;

}

JSCCheckSyntaxResult result = JSC_CHECK_SYNTAX_RESULT_SUCCESS;

if (success)

return result;

switch (error.type()) {

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WebKit/Source/JavaScriptCore/API/glib/JSCContext.cpp at main · WebKit/WebKit · GitHub

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