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96 lines (77 loc) · 3.9 KB
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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(WEBASSEMBLY_DEBUGGER)
#include "WasmInstanceAnchor.h"
#include "WasmModule.h"
#include "WasmVirtualAddress.h"
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/ThreadSafeWeakPtr.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>
namespace JSC {
class JSWebAssemblyModule;
class JSWebAssemblyInstance;
class VM;
class WebAssemblyGCStructure;
namespace Wasm {
class IPIntCallee;
class FunctionCodeIndex;
class JS_EXPORT_PRIVATE ModuleManager {
WTF_MAKE_TZONE_ALLOCATED(ModuleManager);
public:
ModuleManager() = default;
~ModuleManager() = default;
void registerInstance(JSWebAssemblyInstance*);
JSWebAssemblyInstance* jsInstance(uint32_t instanceId);
uint32_t nextInstanceId() const;
String generateLibrariesXML() const;
bool needsLibraryRequery();
void notifyLibraryRequeryComplete();
Vector<uint32_t> unnotifiedInstanceIds() const;
// IDs whose instance has been collected since the last call. Anything keyed by instance —
// breakpoint sites — drains this to drop what the instance left behind.
Vector<uint32_t> takeCollectedInstanceIds();
private:
using IdToInstance = UncheckedKeyHashMap<uint32_t, ThreadSafeWeakPtr<Wasm::InstanceAnchor>, DefaultHash<uint32_t>, WTF::UnsignedWithZeroKeyHashTraits<uint32_t>>;
using InstanceIdSet = UncheckedKeyHashSet<uint32_t, DefaultHash<uint32_t>, WTF::UnsignedWithZeroKeyHashTraits<uint32_t>>;
// Drops entries whose instance has been collected, flagging the library removal for LLDB.
void sweepDeadInstances() WTF_REQUIRES_LOCK(m_lock);
// Amortized cleanup mechanism (matches ThreadSafeWeakHashSet behavior).
void amortizedCleanupIfNeeded() WTF_REQUIRES_LOCK(m_lock);
mutable Lock m_lock;
IdToInstance m_instanceIdToInstance WTF_GUARDED_BY_LOCK(m_lock);
InstanceIdSet m_unnotifiedInstanceIds WTF_GUARDED_BY_LOCK(m_lock); // Instance IDs not yet seen by LLDB; cleared by notifyLibraryRequeryComplete() after each qXfer:libraries:read reply
Vector<uint32_t> m_collectedInstanceIds WTF_GUARDED_BY_LOCK(m_lock); // Swept instance IDs awaiting takeCollectedInstanceIds()
bool m_hasPendingLibraryRemovals WTF_GUARDED_BY_LOCK(m_lock) { false }; // True when an instance went away but LLDB hasn't been notified yet
uint32_t m_nextInstanceId WTF_GUARDED_BY_LOCK(m_lock) { 0 };
mutable unsigned m_operationCountSinceLastCleanup WTF_GUARDED_BY_LOCK(m_lock) { 0 };
mutable unsigned m_maxOperationCountWithoutCleanup WTF_GUARDED_BY_LOCK(m_lock) { 0 };
};
} // namespace Wasm
} // namespace JSC
#endif // ENABLE(WEBASSEMBLY_DEBUGGER)