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Diffstat (limited to 'Source/JavaScriptCore/wasm/js/JSWebAssemblyTable.cpp')
-rw-r--r-- | Source/JavaScriptCore/wasm/js/JSWebAssemblyTable.cpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/wasm/js/JSWebAssemblyTable.cpp b/Source/JavaScriptCore/wasm/js/JSWebAssemblyTable.cpp new file mode 100644 index 000000000..0aff9b924 --- /dev/null +++ b/Source/JavaScriptCore/wasm/js/JSWebAssemblyTable.cpp @@ -0,0 +1,136 @@ +/* + * 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 + * (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 "JSWebAssemblyTable.h" + +#if ENABLE(WEBASSEMBLY) + +#include "JSCInlines.h" +#include "WasmFormat.h" + +namespace JSC { + +const ClassInfo JSWebAssemblyTable::s_info = { "WebAssembly.Table", &Base::s_info, 0, CREATE_METHOD_TABLE(JSWebAssemblyTable) }; + +JSWebAssemblyTable* JSWebAssemblyTable::create(ExecState* exec, VM& vm, Structure* structure, uint32_t initial, std::optional<uint32_t> maximum) +{ + auto throwScope = DECLARE_THROW_SCOPE(vm); + if (!isValidSize(initial)) { + throwException(exec, throwScope, createOutOfMemoryError(exec)); + return nullptr; + } + + auto* instance = new (NotNull, allocateCell<JSWebAssemblyTable>(vm.heap)) JSWebAssemblyTable(vm, structure, initial, maximum); + instance->finishCreation(vm); + return instance; +} + +Structure* JSWebAssemblyTable::createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype) +{ + return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info()); +} + +JSWebAssemblyTable::JSWebAssemblyTable(VM& vm, Structure* structure, uint32_t initial, std::optional<uint32_t> maximum) + : Base(vm, structure) +{ + m_size = initial; + ASSERT(isValidSize(m_size)); + m_maximum = maximum; + ASSERT(!m_maximum || *m_maximum >= m_size); + + // FIXME: It might be worth trying to pre-allocate maximum here. The spec recommends doing so. + // But for now, we're not doing that. + m_functions = MallocPtr<Wasm::CallableFunction>::malloc(sizeof(Wasm::CallableFunction) * static_cast<size_t>(m_size)); + m_jsFunctions = MallocPtr<WriteBarrier<WebAssemblyFunction>>::malloc(sizeof(WriteBarrier<WebAssemblyFunction>) * static_cast<size_t>(m_size)); + for (uint32_t i = 0; i < m_size; ++i) { + new (&m_functions.get()[i]) Wasm::CallableFunction(); + ASSERT(m_functions.get()[i].signatureIndex == Wasm::Signature::invalidIndex); // We rely on this in compiled code. + new (&m_jsFunctions.get()[i]) WriteBarrier<WebAssemblyFunction>(); + } +} + +void JSWebAssemblyTable::finishCreation(VM& vm) +{ + Base::finishCreation(vm); + ASSERT(inherits(vm, info())); +} + +void JSWebAssemblyTable::destroy(JSCell* cell) +{ + static_cast<JSWebAssemblyTable*>(cell)->JSWebAssemblyTable::~JSWebAssemblyTable(); +} + +void JSWebAssemblyTable::visitChildren(JSCell* cell, SlotVisitor& visitor) +{ + JSWebAssemblyTable* thisObject = jsCast<JSWebAssemblyTable*>(cell); + ASSERT_GC_OBJECT_INHERITS(thisObject, info()); + + Base::visitChildren(thisObject, visitor); + + for (unsigned i = 0; i < thisObject->m_size; ++i) + visitor.append(thisObject->m_jsFunctions.get()[i]); +} + +bool JSWebAssemblyTable::grow(uint32_t newSize) +{ + if (newSize < m_size) + return false; + if (newSize == m_size) + return true; + if (maximum() && newSize > *maximum()) + return false; + if (!isValidSize(newSize)) + return false; + + m_functions.realloc(sizeof(Wasm::CallableFunction) * static_cast<size_t>(newSize)); + m_jsFunctions.realloc(sizeof(WriteBarrier<WebAssemblyFunction>) * static_cast<size_t>(newSize)); + + for (uint32_t i = m_size; i < newSize; ++i) { + new (&m_functions.get()[i]) Wasm::CallableFunction(); + new (&m_jsFunctions.get()[i]) WriteBarrier<WebAssemblyFunction>(); + } + m_size = newSize; + return true; +} + +void JSWebAssemblyTable::clearFunction(uint32_t index) +{ + RELEASE_ASSERT(index < m_size); + m_jsFunctions.get()[index] = WriteBarrier<WebAssemblyFunction>(); + m_functions.get()[index] = Wasm::CallableFunction(); + ASSERT(m_functions.get()[index].signatureIndex == Wasm::Signature::invalidIndex); // We rely on this in compiled code. +} + +void JSWebAssemblyTable::setFunction(VM& vm, uint32_t index, WebAssemblyFunction* function) +{ + RELEASE_ASSERT(index < m_size); + m_jsFunctions.get()[index].set(vm, this, function); + m_functions.get()[index] = Wasm::CallableFunction(function->signatureIndex(), function->wasmEntrypoint()); +} + +} // namespace JSC + +#endif // ENABLE(WEBASSEMBLY) |