WebKit/Source/JavaScriptCore/interpreter/MicrotaskCall.h at main · WebKit/WebKit · GitHub

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* 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

#include <JavaScriptCore/CallLinkInfoBase.h>

#include <JavaScriptCore/ExceptionHelpers.h>

#include <JavaScriptCore/FunctionExecutable.h>

#include <JavaScriptCore/JSFunction.h>

#include <wtf/ForbidHeapAllocation.h>

#include <wtf/MathExtras.h>

#include <wtf/TZoneMalloc.h>

namespace JSC {

class Interpreter;

class VM;

class MicrotaskCall final : public CallLinkInfoBase {

WTF_MAKE_NONCOPYABLE(MicrotaskCall);

WTF_FORBID_HEAP_ALLOCATION;

public:

static constexpr unsigned maxCallArguments = 6;

MicrotaskCall()

: CallLinkInfoBase(CallSiteType::MicrotaskCall)

{ }

~MicrotaskCall()

{

m_addressForCall = nullptr;

}

void initialize(VM&, JSFunction*);

template<typename... Args> requires (std::is_convertible_v<Args, JSValue> && ...)

JSValue tryCallWithArguments(VM&, JSFunction*, JSValue thisValue, JSCell* context, Args...);

bool isInitializedFor(ExecutableBase* executable) const

{

return m_functionExecutable == executable;

}

FunctionExecutable* functionExecutable() { return m_functionExecutable; }

void unlinkOrUpgradeImpl(VM&, CodeBlock* oldCodeBlock, CodeBlock* newCodeBlock);

void relink(VM&, JSFunction*);

void clear();

void reconcileWeakReferencesAtGCEnd(VM&);

private:

CodeBlock* m_codeBlock { nullptr };

FunctionExecutable* m_functionExecutable { nullptr };

void* m_addressForCall { nullptr };

unsigned m_numParameters { 0 };

friend class Interpreter;

};

class MicrotaskCallCache final {

WTF_MAKE_NONCOPYABLE(MicrotaskCallCache);

WTF_MAKE_TZONE_ALLOCATED(MicrotaskCallCache);

public:

static constexpr unsigned cacheSize = 8;

static_assert(hasOneBitSet(cacheSize));

MicrotaskCallCache() = default;

ALWAYS_INLINE MicrotaskCall* find(JSValue functionObject)

{

if (!functionObject.isCell()) [[unlikely]]

return nullptr;

auto* cell = functionObject.asCell();

if (cell->type() != JSFunctionType) [[unlikely]]

return nullptr;

auto* executable = uncheckedDowncast<JSFunction>(cell)->executable();

for (auto& entry : m_entries) {

if (entry.isInitializedFor(executable))

return &entry;

}

return nullptr;

}

ALWAYS_INLINE MicrotaskCall* nextEntryToReplace()

{

auto* result = &m_entries[m_nextEntryIndex];

m_nextEntryIndex = (m_nextEntryIndex + 1) & (cacheSize - 1);

return result;

}

void clear()

{

for (auto& entry : m_entries)

entry.clear();

}

void reconcileWeakReferencesAtGCEnd(VM& vm)

{

for (auto& entry : m_entries)

entry.reconcileWeakReferencesAtGCEnd(vm);

}

private:

std::array<MicrotaskCall, cacheSize> m_entries { };

unsigned m_nextEntryIndex { 0 };

};

} // namespace JSC

WebKit/Source/JavaScriptCore/interpreter/MicrotaskCall.h at main · WebKit/WebKit · GitHub

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