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