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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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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_compartment_h
+#define wasm_compartment_h
+
+#include "wasm/WasmJS.h"
+
+namespace js {
+
+class WasmActivation;
+
+namespace wasm {
+
+class Code;
+typedef Vector<Instance*, 0, SystemAllocPolicy> InstanceVector;
+
+// wasm::Compartment lives in JSCompartment and contains the wasm-related
+// per-compartment state. wasm::Compartment tracks every live instance in the
+// compartment and must be notified, via registerInstance(), of any new
+// WasmInstanceObject.
+
+class Compartment
+{
+ InstanceVector instances_;
+ volatile bool mutatingInstances_;
+ size_t activationCount_;
+ bool profilingEnabled_;
+
+ friend class js::WasmActivation;
+
+ struct AutoMutateInstances {
+ Compartment &c;
+ explicit AutoMutateInstances(Compartment& c) : c(c) {
+ MOZ_ASSERT(!c.mutatingInstances_);
+ c.mutatingInstances_ = true;
+ }
+ ~AutoMutateInstances() {
+ MOZ_ASSERT(c.mutatingInstances_);
+ c.mutatingInstances_ = false;
+ }
+ };
+
+ public:
+ explicit Compartment(Zone* zone);
+ ~Compartment();
+ void trace(JSTracer* trc);
+
+ // Before a WasmInstanceObject can be considered fully constructed and
+ // valid, it must be registered with the Compartment. If this method fails,
+ // an error has been reported and the instance object must be abandoned.
+ // After a successful registration, an Instance must call
+ // unregisterInstance() before being destroyed.
+
+ bool registerInstance(JSContext* cx, HandleWasmInstanceObject instanceObj);
+ void unregisterInstance(Instance& instance);
+
+ // Return a vector of all live instances in the compartment. The lifetime of
+ // these Instances is determined by their owning WasmInstanceObject.
+ // Note that accessing instances()[i]->object() triggers a read barrier
+ // since instances() is effectively a weak list.
+
+ const InstanceVector& instances() const { return instances_; }
+
+ // This methods returns the wasm::Code containing the given pc, if any
+ // exists in the compartment.
+
+ Code* lookupCode(const void* pc) const;
+
+ // Currently, there is one Code per Instance so it is also possible to
+ // lookup a Instance given a pc. However, the goal is to share one Code
+ // between multiple Instances at which point in time this method will be
+ // removed.
+
+ Instance* lookupInstanceDeprecated(const void* pc) const;
+
+ // To ensure profiling is enabled (so that wasm frames are not lost in
+ // profiling callstacks), ensureProfilingState must be called before calling
+ // the first wasm function in a compartment.
+
+ bool ensureProfilingState(JSContext* cx);
+ bool profilingEnabled() const;
+
+ // about:memory reporting
+
+ void addSizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf, size_t* compartmentTables);
+};
+
+} // namespace wasm
+} // namespace js
+
+#endif // wasm_compartment_h