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