fc5ef57c7d
:q! This diff is massive, but it's because it connects the client with lldb-server and also ensures that the postmortem case works. - Flatten the postmortem trace schema. The reason is that the schema has become quite complex due to the new multicore case, which defeats the original purpose of having a schema that could work for every trace plug-in. At this point, it's better that each trace plug-in defines it's own full schema. This means that the only common field is "type". -- Because of this new approach, I merged the "common" trace load and saving functionalities into the IntelPT one. This simplified the code quite a bit. If we eventually implement another trace plug-in, we can see then what we could reuse. -- The new schema, which is flattened, has now better comments and is parsed better. A change I did was to disallow hex addresses, because they are a bit error prone. I'm asking now to print the address in decimal. -- Renamed "intel" to "GenuineIntel" in the schema because that's what you see in /proc/cpuinfo. - Implemented reading the context switch trace data buffer. I had to do some refactors to do that cleanly. -- A major change that I did here was to simplify the perf_event circular buffer reading logic. It was too complex. Maybe the original Intel author had something different in mind. - Implemented all the necessary bits to read trace.json files with per-core data. - Implemented all the necessary bits to save to disk per-core trace session. - Added a test that ensures that parsing and saving to disk works. Differential Revision: https://reviews.llvm.org/D126015
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
//===-- IntelPTProcessTrace.h --------------------------------- -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_IntelPTProcessTrace_H_
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#define liblldb_IntelPTProcessTrace_H_
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#include "lldb/Utility/TraceIntelPTGDBRemotePackets.h"
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#include <memory>
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namespace lldb_private {
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namespace process_linux {
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// Abstract class to be inherited by all the process tracing strategies.
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class IntelPTProcessTrace {
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public:
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virtual ~IntelPTProcessTrace() = default;
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virtual void ProcessDidStop() {}
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virtual void ProcessWillResume() {}
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/// Construct a minimal jLLDBTraceGetState response for this process trace.
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virtual TraceIntelPTGetStateResponse GetState() = 0;
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virtual bool TracesThread(lldb::tid_t tid) const = 0;
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/// \copydoc IntelPTThreadTraceCollection::TraceStart()
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virtual llvm::Error TraceStart(lldb::tid_t tid) = 0;
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/// \copydoc IntelPTThreadTraceCollection::TraceStop()
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virtual llvm::Error TraceStop(lldb::tid_t tid) = 0;
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/// \return
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/// \b None if this instance doesn't support the requested data, an \a
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/// llvm::Error if this isntance supports it but fails at fetching it, and
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/// \b Error::success() otherwise.
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virtual llvm::Expected<llvm::Optional<std::vector<uint8_t>>>
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TryGetBinaryData(const TraceGetBinaryDataRequest &request) = 0;
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};
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using IntelPTProcessTraceUP = std::unique_ptr<IntelPTProcessTrace>;
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} // namespace process_linux
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} // namespace lldb_private
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#endif // liblldb_IntelPTProcessTrace_H_
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