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WebAssemblyPromising.cpp
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103 lines (86 loc) · 4.3 KB
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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* 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 "WebAssemblyPromising.h"
#if ENABLE(WEBASSEMBLY)
#include "ArgList.h"
#include "ExceptionHelpers.h"
#include "JSFunctionWithFields.h"
#include "JSObjectInlines.h"
#include "JSPIContextInlines.h"
#include "JSPromise.h"
namespace JSC {
static JSC_DECLARE_HOST_FUNCTION(runWebAssemblyPromisingFunction);
// This implements the logic invoked when a function produced by the expression
// 'WebAssembly.promising(wrappedFunction)' is called.
JSC_DEFINE_HOST_FUNCTION(runWebAssemblyPromisingFunction, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* callee = callFrame->jsCallee();
JSFunctionWithFields* thisFunction = jsCast<JSFunctionWithFields*>(callee);
ASSERT(thisFunction);
JSFunction* wrappedFunction = jsCast<JSFunction*>(thisFunction->getField(JSFunctionWithFields::Field::WebAssemblyPromisingWrappedFunction));
MarkedArgumentBuffer args;
for (unsigned i = 0; i < callFrame->argumentCount(); ++i)
args.append(callFrame->uncheckedArgument(i));
if (args.hasOverflowed()) [[unlikely]] {
throwOutOfMemoryError(globalObject, scope);
return { };
}
auto callData = JSC::getCallData(wrappedFunction);
if (callData.type == CallData::Type::None) {
throwTypeError(globalObject, scope, "Object is not callable"_s);
return { };
}
JSPromise* resultPromise = JSPromise::create(vm, globalObject->promiseStructure());
JSPIContext context(JSPIContext::Purpose::Promising, vm, callFrame, resultPromise);
JSValue result = call(globalObject, wrappedFunction, callData, jsUndefined(), args);
context.deactivate(vm);
if (scope.exception()) [[unlikely]] {
// An exception was thrown in wasm code
JSValue exceptionValue = scope.exception()->value();
TRY_CLEAR_EXCEPTION(scope, { });
resultPromise->reject(vm, globalObject, exceptionValue);
} else if (!context.completion) [[likely]] {
// The call returned without suspending, result is the returned value
resultPromise->resolve(globalObject, vm, result);
}
// If neither of the the above conditions are true, the call was suspended
// and all the promises involved are fully hooked up to do the right thing.
scope.release();
return JSValue::encode(resultPromise);
}
JSFunctionWithFields* createWebAssemblyPromisingFunction(VM& vm, JSGlobalObject* globalObject, JSFunction* wrappedFunction)
{
const String name = "WebAssembly.promising"_s;
NativeExecutable* executable = vm.getHostFunction(runWebAssemblyPromisingFunction, ImplementationVisibility::Public, NoIntrinsic, callHostFunctionAsConstructor, nullptr, name);
constexpr unsigned length = 1;
JSFunctionWithFields* function = JSFunctionWithFields::create(vm, globalObject, executable, length, name);
function->setField(vm, JSFunctionWithFields::Field::WebAssemblyPromisingWrappedFunction, wrappedFunction);
return function;
}
} // namespace JSC
#endif