WebKit/Source/JavaScriptCore/inspector/AsyncStackTrace.cpp 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. AND ITS CONTRIBUTORS ``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 ITS 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.

#include "config.h"

#include "AsyncStackTrace.h"

#include "ScriptCallStack.h"

#include <wtf/Ref.h>

namespace Inspector {

Ref<AsyncStackTrace> AsyncStackTrace::create(Ref<ScriptCallStack>&& callStack, bool singleShot, RefPtr<AsyncStackTrace> parent)

{

return adoptRef(*new AsyncStackTrace(WTF::move(callStack), singleShot, WTF::move(parent)));

}

AsyncStackTrace::AsyncStackTrace(Ref<ScriptCallStack>&& callStack, bool singleShot, RefPtr<AsyncStackTrace> parent)

: m_callStack(WTF::move(callStack))

, m_parent(parent)

, m_singleShot(singleShot)

{

ASSERT(size());

if (m_parent)

m_parent->m_childCount++;

}

AsyncStackTrace::~AsyncStackTrace()

{

if (m_parent)

remove();

ASSERT(!m_childCount);

}

bool AsyncStackTrace::isPending() const

{

return m_state == State::Pending;

}

bool AsyncStackTrace::isLocked() const

{

return m_state == State::Pending || m_state == State::Active || m_childCount > 1;

}

const ScriptCallFrame& AsyncStackTrace::at(size_t index) const

{

return m_callStack->at(index);

}

size_t AsyncStackTrace::size() const

{

return m_callStack->size();

}

bool AsyncStackTrace::topCallFrameIsBoundary() const

{

return at(0).isNative();

}

void AsyncStackTrace::willDispatchAsyncCall(size_t maxDepth)

{

ASSERT(m_state == State::Pending);

m_state = State::Active;

truncate(maxDepth);

}

void AsyncStackTrace::didDispatchAsyncCall()

{

ASSERT(m_state == State::Active || m_state == State::Canceled);

if (m_state == State::Active && !m_singleShot) {

m_state = State::Pending;

return;

}

m_state = State::Dispatched;

if (!m_childCount)

remove();

}

void AsyncStackTrace::didCancelAsyncCall()

{

if (m_state == State::Canceled)

return;

if (m_state == State::Pending && !m_childCount)

remove();

m_state = State::Canceled;

}

RefPtr<Protocol::Console::StackTrace> AsyncStackTrace::buildInspectorObject() const

{

RefPtr<Protocol::Console::StackTrace> topStackTrace;

RefPtr<Protocol::Console::StackTrace> previousStackTrace;

for (auto* stackTrace = this; stackTrace; stackTrace = stackTrace->m_parent.get()) {

auto& callStack = stackTrace->m_callStack;

bool truncated = stackTrace->m_truncated;

bool topCallFrameIsBoundary = stackTrace->topCallFrameIsBoundary();

// Skip async stack traces that only contain the boundary frame.

// If none contain more than the boundary frame then pretend there are no async stack traces.

if (topCallFrameIsBoundary && !truncated && stackTrace->size() == 1)

continue;

auto protocolObject = Protocol::Console::StackTrace::create()

.setCallFrames(callStack->buildInspectorArray())

.release();

if (truncated)

protocolObject->setTruncated(true);

if (topCallFrameIsBoundary)

protocolObject->setTopCallFrameIsBoundary(true);

if (!topStackTrace)

topStackTrace = protocolObject.ptr();

if (previousStackTrace)

previousStackTrace->setParentStackTrace(protocolObject.copyRef());

previousStackTrace = WTF::move(protocolObject);

}

return topStackTrace;

}

void AsyncStackTrace::truncate(size_t maxDepth)

{

AsyncStackTrace* lastUnlockedAncestor = nullptr;

size_t depth = 0;

auto* newStackTraceRoot = this;

while (newStackTraceRoot) {

depth += newStackTraceRoot->size();

if (depth >= maxDepth)

break;

auto* parent = newStackTraceRoot->m_parent.get();

if (!lastUnlockedAncestor && parent && parent->isLocked())

lastUnlockedAncestor = newStackTraceRoot;

newStackTraceRoot = parent;

}

if (!newStackTraceRoot || !newStackTraceRoot->m_parent)

return;

if (!lastUnlockedAncestor) {

// No locked nodes belong to the trace. The subtree at the new root

// is moved to a new tree, and marked as truncated if necessary.

newStackTraceRoot->m_truncated = true;

newStackTraceRoot->remove();

return;

}

// The new root has a locked descendent. Since truncating a stack trace

// cannot mutate locked nodes or their ancestors, a new tree is created by

// cloning the locked portion of the trace (the path from the locked node

// to the new root). The subtree rooted at the last unlocked ancestor is

// then appended to the new tree.

auto* previousNode = lastUnlockedAncestor;

// The subtree being truncated must be removed from it's parent before

// updating its parent pointer chain.

RefPtr<AsyncStackTrace> sourceNode = lastUnlockedAncestor->m_parent;

lastUnlockedAncestor->remove();

while (sourceNode) {

previousNode->m_parent = AsyncStackTrace::create(sourceNode->m_callStack.copyRef(), true, nullptr);

previousNode->m_parent->m_childCount = 1;

previousNode = previousNode->m_parent.get();

if (sourceNode.get() == newStackTraceRoot)

break;

sourceNode = sourceNode->m_parent;

}

previousNode->m_truncated = true;

}

void AsyncStackTrace::remove()

{

if (!m_parent)

return;

ASSERT(m_parent->m_childCount);

m_parent->m_childCount--;

m_parent = nullptr;

m_callStack->removeParentStackTrace();

}

} // namespace Inspector

WebKit/Source/JavaScriptCore/inspector/AsyncStackTrace.cpp at main · WebKit/WebKit · GitHub

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