Source/JavaScriptCore/wasm/JSWebAssembly.cpp

/*
 * Copyright (C) 2016 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "config.h"
#include "JSWebAssembly.h"

#if ENABLE(WEBASSEMBLY)

#include "Exception.h"
#include "FunctionPrototype.h"
#include "JSCInlines.h"
#include "JSPromiseDeferred.h"
#include "JSWebAssemblyHelpers.h"
#include "WasmPlan.h"
#include "WebAssemblyModuleConstructor.h"

namespace JSC {

STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSWebAssembly);

EncodedJSValue JSC_HOST_CALL webAssemblyValidateFunc(ExecState*);
EncodedJSValue JSC_HOST_CALL webAssemblyCompileFunc(ExecState*);

EncodedJSValue JSC_HOST_CALL webAssemblyCompileFunc(ExecState* exec)
{
    VM& vm = exec->vm();
    auto catchScope = DECLARE_CATCH_SCOPE(vm);

    JSPromiseDeferred* promise = JSPromiseDeferred::create(exec, exec->lexicalGlobalObject());
    RETURN_IF_EXCEPTION(catchScope, { });

    // FIXME: Make this truly asynchronous:
    // https://bugs.webkit.org/show_bug.cgi?id=166016
    JSValue module = WebAssemblyModuleConstructor::createModule(exec, exec->lexicalGlobalObject()->WebAssemblyModuleStructure());
    if (Exception* exception = catchScope.exception()) {
        catchScope.clearException();
        promise->reject(exec, exception);
        return JSValue::encode(promise->promise());
    }

    promise->resolve(exec, module);
    return JSValue::encode(promise->promise());
}

EncodedJSValue JSC_HOST_CALL webAssemblyValidateFunc(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    size_t byteOffset;
    size_t byteSize;
    uint8_t* base = getWasmBufferFromValue(exec, exec->argument(0), byteOffset, byteSize);
    RETURN_IF_EXCEPTION(scope, { });
    Wasm::Plan plan(&vm, base + byteOffset, byteSize);
    // FIXME: We might want to throw an OOM exception here if we detect that something will OOM.
    // https://bugs.webkit.org/show_bug.cgi?id=166015
    return JSValue::encode(jsBoolean(plan.parseAndValidateModule()));
}

const ClassInfo JSWebAssembly::s_info = { "WebAssembly", &Base::s_info, 0, CREATE_METHOD_TABLE(JSWebAssembly) };

JSWebAssembly* JSWebAssembly::create(VM& vm, JSGlobalObject* globalObject, Structure* structure)
{
    auto* object = new (NotNull, allocateCell<JSWebAssembly>(vm.heap)) JSWebAssembly(vm, structure);
    object->finishCreation(vm, globalObject);
    return object;
}

Structure* JSWebAssembly::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
{
    return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
}

void JSWebAssembly::finishCreation(VM& vm, JSGlobalObject* globalObject)
{
    Base::finishCreation(vm);
    ASSERT(inherits(info()));
    JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION("validate", webAssemblyValidateFunc, DontEnum, 1);
    JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION("compile", webAssemblyCompileFunc, DontEnum, 1);
}

JSWebAssembly::JSWebAssembly(VM& vm, Structure* structure)
    : JSNonFinalObject(vm, structure)
{
}

} // namespace JSC

#endif // ENABLE(WEBASSEMBLY)