zrthxn created this revision.
zrthxn added reviewers: wallace, jj10306.
Herald added a project: All.
zrthxn requested review of this revision.
Herald added a project: LLDB.
Herald added a subscriber: lldb-commits.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D122603
Files:
lldb/source/Plugins/Trace/intel-pt/DecodedThread.cpp
lldb/source/Plugins/Trace/intel-pt/DecodedThread.h
lldb/source/Plugins/Trace/intel-pt/IntelPTDecoder.cpp
lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.cpp
lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.h
Index: lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.h
===================================================================
--- lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.h
+++ lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.h
@@ -42,6 +42,8 @@
DecodedThreadSP m_decoded_thread_sp;
/// Internal instruction index currently pointing at.
size_t m_pos;
+ /// Current instruction timestamp.
+ uint64_t m_currentts;
};
} // namespace trace_intel_pt
Index: lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.cpp
===================================================================
--- lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.cpp
+++ lldb/source/Plugins/Trace/intel-pt/TraceCursorIntelPT.cpp
@@ -74,7 +74,7 @@
}
bool TraceCursorIntelPT::IsError() {
- return m_decoded_thread_sp->GetInstructions()[m_pos].IsError();
+ return m_decoded_thread_sp->GetInstructionIsError(m_pos);
}
const char *TraceCursorIntelPT::GetError() {
@@ -88,7 +88,8 @@
Optional<uint64_t> TraceCursorIntelPT::GetCounter(lldb::TraceCounter counter_type) {
switch (counter_type) {
case lldb::eTraceCounterTSC:
- return m_decoded_thread_sp->GetInstructions()[m_pos].GetTimestampCounter();
+ // Hack to satisfy the the type of inherited member function
+ return Optional<uint64_t>(m_decoded_thread_sp->GetInstructionTimestamp(m_pos));
}
}
Index: lldb/source/Plugins/Trace/intel-pt/IntelPTDecoder.cpp
===================================================================
--- lldb/source/Plugins/Trace/intel-pt/IntelPTDecoder.cpp
+++ lldb/source/Plugins/Trace/intel-pt/IntelPTDecoder.cpp
@@ -150,7 +150,8 @@
// was enabled.
decoded_thread_sp->AppendInstruction(insn);
} else {
- decoded_thread_sp->AppendInstruction(insn, time);
+ decoded_thread_sp->AppendInstruction(insn);
+ decoded_thread_sp->AppendInstructionTimestamp(time);
}
}
}
Index: lldb/source/Plugins/Trace/intel-pt/DecodedThread.h
===================================================================
--- lldb/source/Plugins/Trace/intel-pt/DecodedThread.h
+++ lldb/source/Plugins/Trace/intel-pt/DecodedThread.h
@@ -62,9 +62,6 @@
/// As mentioned, any gap is represented as an error in this class.
class IntelPTInstruction {
public:
- IntelPTInstruction(const pt_insn &pt_insn, uint64_t timestamp)
- : m_pt_insn(pt_insn), m_timestamp(timestamp), m_is_error(false) {}
-
IntelPTInstruction(const pt_insn &pt_insn)
: m_pt_insn(pt_insn), m_is_error(false) {}
@@ -85,13 +82,6 @@
/// Get the size in bytes of an instance of this class
static size_t GetMemoryUsage();
- /// Get the timestamp associated with the current instruction. The timestamp
- /// is similar to what a rdtsc instruction would return.
- ///
- /// \return
- /// The timestamp or \b llvm::None if not available.
- llvm::Optional<uint64_t> GetTimestampCounter() const;
-
/// Get the \a lldb::TraceInstructionControlFlowType categories of the
/// instruction.
///
@@ -113,7 +103,6 @@
// When adding new members to this class, make sure to update
// IntelPTInstruction::GetNonErrorMemoryUsage() if needed.
pt_insn m_pt_insn;
- llvm::Optional<uint64_t> m_timestamp;
bool m_is_error;
};
@@ -131,6 +120,15 @@
/// Utility constructor that initializes the trace with a provided error.
DecodedThread(lldb::ThreadSP thread_sp, llvm::Error &&err);
+ /// Append a successfully decoded instruction.
+ void AppendInstruction(pt_insn instruction);
+
+ /// Append a timestamp at the index of the last instruction.
+ void AppendInstructionTimestamp(uint64_t timestamp);
+
+ /// Append a decoding error (i.e. an instruction that failed to be decoded).
+ void AppendError(llvm::Error &&error);
+
/// Get the instructions from the decoded trace. Some of them might indicate
/// errors (i.e. gaps) in the trace. For an instruction error, you can access
/// its underlying error message with the \a GetErrorByInstructionIndex()
@@ -140,20 +138,21 @@
/// The instructions of the trace.
llvm::ArrayRef<IntelPTInstruction> GetInstructions() const;
+ /// Get timestamp of an instruction by its index.
+ uint64_t GetInstructionTimestamp(size_t index) const;
+
+ /// Check if the instruction at a given index was an error.
+ /// -- Reasoning (this will be removed before committing)
+ /// This is faster and less wasteful of memory than creating an ArrayRef
+ /// every time that you need to check this, with GetInstructions()[i].IsError()
+ bool GetInstructionIsError(size_t insn_idx) const;
+
/// Get the error associated with a given instruction index.
///
/// \return
/// The error message of \b nullptr if the given index
/// points to a valid instruction.
- const char *GetErrorByInstructionIndex(uint64_t ins_idx);
-
- /// Append a successfully decoded instruction.
- template <typename... Ts> void AppendInstruction(Ts... instruction_args) {
- m_instructions.emplace_back(instruction_args...);
- }
-
- /// Append a decoding error (i.e. an instruction that failed to be decoded).
- void AppendError(llvm::Error &&error);
+ const char *GetErrorByInstructionIndex(size_t ins_idx);
/// Get a new cursor for the decoded thread.
lldb::TraceCursorUP GetCursor();
@@ -178,6 +177,7 @@
/// to update \a CalculateApproximateMemoryUsage() accordingly.
lldb::ThreadSP m_thread_sp;
std::vector<IntelPTInstruction> m_instructions;
+ std::map<size_t, uint64_t> m_instruction_timestamps;
llvm::DenseMap<uint64_t, std::string> m_errors;
llvm::Optional<size_t> m_raw_trace_size;
};
Index: lldb/source/Plugins/Trace/intel-pt/DecodedThread.cpp
===================================================================
--- lldb/source/Plugins/Trace/intel-pt/DecodedThread.cpp
+++ lldb/source/Plugins/Trace/intel-pt/DecodedThread.cpp
@@ -49,10 +49,6 @@
return sizeof(IntelPTInstruction);
}
-Optional<uint64_t> IntelPTInstruction::GetTimestampCounter() const {
- return m_timestamp;
-}
-
Optional<size_t> DecodedThread::GetRawTraceSize() const {
return m_raw_trace_size;
}
@@ -90,6 +86,16 @@
ThreadSP DecodedThread::GetThread() { return m_thread_sp; }
+void DecodedThread::AppendInstruction(pt_insn insn) {
+ m_instructions.emplace_back(insn);
+}
+
+void DecodedThread::AppendInstructionTimestamp(uint64_t time) {
+ auto last_ts = m_instruction_timestamps.find(m_instruction_timestamps.size() - 1);
+ if (last_ts->second != time)
+ m_instruction_timestamps.emplace(m_instructions.size() - 1, time);
+}
+
void DecodedThread::AppendError(llvm::Error &&error) {
m_errors.try_emplace(m_instructions.size(), toString(std::move(error)));
m_instructions.emplace_back();
@@ -99,7 +105,16 @@
return makeArrayRef(m_instructions);
}
-const char *DecodedThread::GetErrorByInstructionIndex(uint64_t idx) {
+uint64_t DecodedThread::GetInstructionTimestamp(size_t index) const {
+ // m_instruction_timestamps.find(index)
+ return 0;
+}
+
+bool DecodedThread::GetInstructionIsError(size_t idx) const {
+ return m_instructions[idx].IsError();
+}
+
+const char *DecodedThread::GetErrorByInstructionIndex(size_t idx) {
auto it = m_errors.find(idx);
if (it == m_errors.end())
return nullptr;
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