mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-11 11:20:43 +00:00
124 lines
4.5 KiB
C++
124 lines
4.5 KiB
C++
/*
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* Copyright (C) 2017-2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(WEBASSEMBLY)
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#include "WasmFormat.h"
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#include "WasmLimits.h"
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#include "WriteBarrier.h"
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#include <wtf/MallocPtr.h>
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#include <wtf/Optional.h>
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#include <wtf/Ref.h>
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#include <wtf/ThreadSafeRefCounted.h>
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namespace JSC { namespace Wasm {
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class Instance;
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class FuncRefTable;
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class Table : public ThreadSafeRefCounted<Table> {
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WTF_MAKE_NONCOPYABLE(Table);
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WTF_MAKE_FAST_ALLOCATED(Table);
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public:
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static RefPtr<Table> tryCreate(uint32_t initial, Optional<uint32_t> maximum, TableElementType);
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JS_EXPORT_PRIVATE ~Table() = default;
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Optional<uint32_t> maximum() const { return m_maximum; }
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uint32_t length() const { return m_length; }
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static ptrdiff_t offsetOfLength() { return OBJECT_OFFSETOF(Table, m_length); }
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static ptrdiff_t offsetOfMask() { return OBJECT_OFFSETOF(Table, m_mask); }
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static uint32_t allocatedLength(uint32_t length);
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uint32_t mask() const { return m_mask; }
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template<typename T> T* owner() const { return reinterpret_cast<T*>(m_owner); }
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void setOwner(JSObject* owner)
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{
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ASSERT(!m_owner);
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ASSERT(owner);
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m_owner = owner;
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}
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TableElementType type() const { return m_type; }
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bool isExternrefTable() const { return m_type == TableElementType::Externref; }
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bool isFuncrefTable() const { return m_type == TableElementType::Funcref; }
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FuncRefTable* asFuncrefTable();
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static bool isValidLength(uint32_t length) { return length < maxTableEntries; }
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void clear(uint32_t);
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void set(uint32_t, JSValue);
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JSValue get(uint32_t) const;
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Optional<uint32_t> grow(uint32_t delta, JSValue defaultValue);
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void copy(const Table* srcTable, uint32_t dstIndex, uint32_t srcIndex);
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void visitAggregate(SlotVisitor&);
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protected:
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Table(uint32_t initial, Optional<uint32_t> maximum, TableElementType = TableElementType::Externref);
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void setLength(uint32_t);
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uint32_t m_length;
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uint32_t m_mask;
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const TableElementType m_type;
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const Optional<uint32_t> m_maximum;
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MallocPtr<WriteBarrier<Unknown>, VMMalloc> m_jsValues;
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JSObject* m_owner;
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};
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class FuncRefTable : public Table {
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public:
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JS_EXPORT_PRIVATE ~FuncRefTable() = default;
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void setFunction(uint32_t, JSObject*, WasmToWasmImportableFunction, Instance*);
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const WasmToWasmImportableFunction& function(uint32_t) const;
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Instance* instance(uint32_t) const;
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void copyFunction(const FuncRefTable* srcTable, uint32_t dstIndex, uint32_t srcIndex);
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static ptrdiff_t offsetOfFunctions() { return OBJECT_OFFSETOF(FuncRefTable, m_importableFunctions); }
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static ptrdiff_t offsetOfInstances() { return OBJECT_OFFSETOF(FuncRefTable, m_instances); }
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private:
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FuncRefTable(uint32_t initial, Optional<uint32_t> maximum);
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MallocPtr<WasmToWasmImportableFunction, VMMalloc> m_importableFunctions;
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// 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.
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MallocPtr<Instance*, VMMalloc> m_instances;
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friend class Table;
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};
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} } // namespace JSC::Wasm
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#endif // ENABLE(WEBASSEMBLY)
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