1 files changed, 89 insertions, 0 deletions
diff --git a/js/src/wasm/WasmTable.h b/js/src/wasm/WasmTable.h
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+++ b/js/src/wasm/WasmTable.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ *
+ * 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