/* * Copyright (C) 2017-2018 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. */ #pragma once #if ENABLE(WEBASSEMBLY) #include "WasmFormat.h" #include "WasmLimits.h" #include <wtf/MallocPtr.h> #include <wtf/Optional.h> #include <wtf/Ref.h> #include <wtf/ThreadSafeRefCounted.h> namespace JSC { namespace Wasm { class Instance; class Table : public ThreadSafeRefCounted<Table> { public: static RefPtr<Table> create(uint32_t initial, std::optional<uint32_t> maximum); JS_EXPORT_PRIVATE ~Table(); std::optional<uint32_t> maximum() const { return m_maximum; } uint32_t length() const { return m_length; } std::optional<uint32_t> grow(uint32_t delta) WARN_UNUSED_RETURN; void clearFunction(uint32_t); void setFunction(uint32_t, WasmToWasmImportableFunction, Instance*); static ptrdiff_t offsetOfFunctions() { return OBJECT_OFFSETOF(Table, m_importableFunctions); } static ptrdiff_t offsetOfInstances() { return OBJECT_OFFSETOF(Table, m_instances); } static ptrdiff_t offsetOfLength() { return OBJECT_OFFSETOF(Table, m_length); } static ptrdiff_t offsetOfMask() { return OBJECT_OFFSETOF(Table, m_mask); } static uint32_t allocatedLength(uint32_t length); uint32_t mask() const { return m_mask; } static bool isValidLength(uint32_t length) { return length < maxTableEntries; } private: Table(uint32_t initial, std::optional<uint32_t> maximum); void setLength(uint32_t); MallocPtr<WasmToWasmImportableFunction> m_importableFunctions; // call_indirect needs to do an Instance check to potentially context switch when calling a function to another instance. We can hold raw pointers to Instance here because the embedder ensures that Table keeps all the instances alive. We couldn't hold a Ref here because it would cause cycles. MallocPtr<Instance*> m_instances; uint32_t m_length; uint32_t m_mask; std::optional<uint32_t> m_maximum; }; } } // namespace JSC::Wasm #endif // ENABLE(WEBASSEMBLY)