StackVisitor::StackVisitor(CallFrame* startFrame, VM* vm)
{
m_frame.m_index = 0;
m_frame.m_isWasmFrame = false;
CallFrame* topFrame;
if (startFrame) {
ASSERT(vm);
ASSERT(!vm->topCallFrame || reinterpret_cast<void*>(vm->topCallFrame) != vm->topEntryFrame);
m_frame.m_entryFrame = vm->topEntryFrame;
topFrame = vm->topCallFrame;
if (topFrame && topFrame->isStackOverflowFrame()) {
topFrame = topFrame->callerFrame(m_frame.m_entryFrame);
m_topEntryFrameIsEmpty = (m_frame.m_entryFrame != vm->topEntryFrame);
if (startFrame == vm->topCallFrame)
startFrame = topFrame;
}
} else {
m_frame.m_entryFrame = 0;
topFrame = 0;
}
m_frame.m_callerIsEntryFrame = false;
readFrame(topFrame);
// Find the frame the caller wants to start unwinding from.
while (m_frame.callFrame() && m_frame.callFrame() != startFrame)
gotoNextFrame();
}
