PSBBlockAnomalyDetector Class Reference

Class used to identify anomalies in traces, which should often indicate a fatal error in the trace. More...

Public Member Functions
	PSBBlockAnomalyDetector (pt_insn_decoder &decoder, TraceIntelPT &trace_intel_pt, DecodedThread &decoded_thread)
Error	DetectAnomaly ()

Private Member Functions
std::optional< uint64_t >	TryIdentifyInfiniteLoop ()
void	RefreshPacketOffset ()

Private Attributes
pt_insn_decoder &	m_decoder
DecodedThread &	m_decoded_thread
lldb::addr_t	m_last_packet_offset = LLDB_INVALID_ADDRESS
uint64_t	m_insn_count_at_last_packet_offset = 0
uint64_t	m_infinite_decoding_loop_threshold
uint64_t	m_next_infinite_decoding_loop_threshold
uint64_t	m_extremely_large_decoding_threshold

Detailed Description

Class used to identify anomalies in traces, which should often indicate a fatal error in the trace.

Definition at line 134 of file LibiptDecoder.cpp.

Constructor & Destructor Documentation

PSBBlockAnomalyDetector()

PSBBlockAnomalyDetector::PSBBlockAnomalyDetector ( pt_insn_decoder &  decoder, TraceIntelPT &  trace_intel_pt, DecodedThread &  decoded_thread  )

inline

Definition at line 136 of file LibiptDecoder.cpp.

References lldb_private::trace_intel_pt::TraceIntelPT::PluginProperties::GetExtremelyLargeDecodingThreshold(), lldb_private::trace_intel_pt::TraceIntelPT::GetGlobalProperties(), lldb_private::trace_intel_pt::TraceIntelPT::PluginProperties::GetInfiniteDecodingLoopVerificationThreshold(), m_extremely_large_decoding_threshold, m_infinite_decoding_loop_threshold, and m_next_infinite_decoding_loop_threshold.

Member Function Documentation

DetectAnomaly()

Error PSBBlockAnomalyDetector::DetectAnomaly ( )

inline

Returns

An llvm::Error if an anomaly that includes the last instruction item in the trace, or llvm::Error::success otherwise.

Definition at line 153 of file LibiptDecoder.cpp.

References lldb_private::trace_intel_pt::DecodedThread::GetTotalInstructionCount(), m_decoded_thread, m_extremely_large_decoding_threshold, m_insn_count_at_last_packet_offset, m_next_infinite_decoding_loop_threshold, RefreshPacketOffset(), and TryIdentifyInfiniteLoop().

Referenced by PSBBlockDecoder::AppendInstructionAndDetectAnomalies().

RefreshPacketOffset()

void PSBBlockAnomalyDetector::RefreshPacketOffset ( )

inlineprivate

Definition at line 288 of file LibiptDecoder.cpp.

References lldb_private::trace_intel_pt::DecodedThread::GetTotalInstructionCount(), IsLibiptError(), m_decoded_thread, m_decoder, m_infinite_decoding_loop_threshold, m_insn_count_at_last_packet_offset, m_last_packet_offset, and m_next_infinite_decoding_loop_threshold.

Referenced by DetectAnomaly().

TryIdentifyInfiniteLoop()

std::optional< uint64_t > PSBBlockAnomalyDetector::TryIdentifyInfiniteLoop ( )

inlineprivate

Definition at line 213 of file LibiptDecoder.cpp.

References lldb::eTraceItemKindInstruction, lldb_private::trace_intel_pt::DecodedThread::GetInstructionLoadAddress(), lldb_private::trace_intel_pt::DecodedThread::GetItemKindByIndex(), lldb_private::trace_intel_pt::DecodedThread::GetItemsCount(), and m_decoded_thread.

Referenced by DetectAnomaly().

Member Data Documentation

m_decoded_thread

DecodedThread& PSBBlockAnomalyDetector::m_decoded_thread

private

Definition at line 301 of file LibiptDecoder.cpp.

Referenced by DetectAnomaly(), RefreshPacketOffset(), and TryIdentifyInfiniteLoop().

m_decoder

pt_insn_decoder& PSBBlockAnomalyDetector::m_decoder

private

Definition at line 300 of file LibiptDecoder.cpp.

Referenced by RefreshPacketOffset().

m_extremely_large_decoding_threshold

uint64_t PSBBlockAnomalyDetector::m_extremely_large_decoding_threshold

private

Definition at line 306 of file LibiptDecoder.cpp.

Referenced by DetectAnomaly(), and PSBBlockAnomalyDetector().

m_infinite_decoding_loop_threshold

uint64_t PSBBlockAnomalyDetector::m_infinite_decoding_loop_threshold

private

Definition at line 304 of file LibiptDecoder.cpp.

Referenced by PSBBlockAnomalyDetector(), and RefreshPacketOffset().

m_insn_count_at_last_packet_offset

uint64_t PSBBlockAnomalyDetector::m_insn_count_at_last_packet_offset = 0

private

Definition at line 303 of file LibiptDecoder.cpp.

Referenced by DetectAnomaly(), and RefreshPacketOffset().

m_last_packet_offset

lldb::addr_t PSBBlockAnomalyDetector::m_last_packet_offset = LLDB_INVALID_ADDRESS

private

Definition at line 302 of file LibiptDecoder.cpp.

Referenced by RefreshPacketOffset().

m_next_infinite_decoding_loop_threshold

uint64_t PSBBlockAnomalyDetector::m_next_infinite_decoding_loop_threshold

private

Definition at line 305 of file LibiptDecoder.cpp.

Referenced by DetectAnomaly(), PSBBlockAnomalyDetector(), and RefreshPacketOffset().

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The documentation for this class was generated from the following file:

• LibiptDecoder.cpp