90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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*
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* Copyright 2016 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef wasm_table_h
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#define wasm_table_h
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#include "gc/Policy.h"
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#include "wasm/WasmCode.h"
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namespace js {
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namespace wasm {
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// A Table is an indexable array of opaque values. Tables are first-class
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// stateful objects exposed to WebAssembly. asm.js also uses Tables to represent
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// its homogeneous function-pointer tables.
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class Table : public ShareableBase<Table>
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{
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using InstanceSet = GCHashSet<ReadBarrieredWasmInstanceObject,
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MovableCellHasher<ReadBarrieredWasmInstanceObject>,
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SystemAllocPolicy>;
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typedef UniquePtr<uint8_t[], JS::FreePolicy> UniqueByteArray;
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ReadBarrieredWasmTableObject maybeObject_;
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JS::WeakCache<InstanceSet> observers_;
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UniqueByteArray array_;
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const TableKind kind_;
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uint32_t length_;
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const Maybe<uint32_t> maximum_;
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const bool external_;
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template <class> friend struct js::MallocProvider;
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Table(JSContext* cx, const TableDesc& td, HandleWasmTableObject maybeObject,
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UniqueByteArray array);
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void tracePrivate(JSTracer* trc);
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friend class js::WasmTableObject;
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public:
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static RefPtr<Table> create(JSContext* cx, const TableDesc& desc,
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HandleWasmTableObject maybeObject);
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void trace(JSTracer* trc);
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bool external() const { return external_; }
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bool isTypedFunction() const { return kind_ == TableKind::TypedFunction; }
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uint32_t length() const { return length_; }
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Maybe<uint32_t> maximum() const { return maximum_; }
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uint8_t* base() const { return array_.get(); }
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// All updates must go through a set() function with the exception of
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// (profiling) updates to the callee pointer that do not change which
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// logical function is being called.
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void** internalArray() const;
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ExternalTableElem* externalArray() const;
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void set(uint32_t index, void* code, Instance& instance);
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void setNull(uint32_t index);
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uint32_t grow(uint32_t delta, JSContext* cx);
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bool movingGrowable() const;
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bool addMovingGrowObserver(JSContext* cx, WasmInstanceObject* instance);
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// about:memory reporting:
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size_t sizeOfExcludingThis(MallocSizeOf mallocSizeOf) const;
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};
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typedef RefPtr<Table> SharedTable;
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typedef Vector<SharedTable, 0, SystemAllocPolicy> SharedTableVector;
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} // namespace wasm
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} // namespace js
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#endif // wasm_table_h
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