113 lines
4.3 KiB
C++
113 lines
4.3 KiB
C++
//===-- SessionSaver.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 LLDB_TARGET_TRACESESSIONSAVER_H
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#define LLDB_TARGET_TRACESESSIONSAVER_H
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#include "TraceJSONStructs.h"
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namespace lldb_private {
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class TraceSessionSaver {
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public:
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/// Save the trace session description JSON object inside the given directory
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/// as a file named \a trace.json.
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///
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/// \param[in] trace_session_description
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/// The trace's session, as JSON Object.
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///
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/// \param[in] directory
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/// The directory where the JSON file will be saved.
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///
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/// \return
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/// \a llvm::success if the operation was successful, or an \a llvm::Error
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/// otherwise.
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static llvm::Error
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WriteSessionToFile(const llvm::json::Value &trace_session_description,
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FileSpec directory);
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/// Build the processes section of the trace session description file. Besides
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/// returning the processes information, this method saves to disk all modules
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/// and raw traces corresponding to the traced threads of the given process.
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///
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/// \param[in] live_process
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/// The process being traced.
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///
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/// \param[in] raw_trace_fetcher
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/// Callback function that receives a thread ID and returns its raw trace.
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/// This callback should return \a None if the thread is not being traced.
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/// Otherwise, it should return the raw trace in bytes or an
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/// \a llvm::Error in case of failures.
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///
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/// \param[in] directory
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/// The directory where files will be saved when building the processes
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/// section.
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///
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/// \return
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/// The processes section or \a llvm::Error in case of failures.
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static llvm::Expected<JSONTraceSessionBase> BuildProcessesSection(
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Process &live_process,
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std::function<
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llvm::Expected<llvm::Optional<std::vector<uint8_t>>>(lldb::tid_t tid)>
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raw_trace_fetcher,
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FileSpec directory);
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/// Build the threads sub-section of the trace session description file.
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/// For each traced thread, its raw trace is also written to the file
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/// \a thread_id_.trace inside of the given directory.
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///
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/// \param[in] live_process
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/// The process being traced.
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///
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/// \param[in] raw_trace_fetcher
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/// Callback function that receives a thread ID and returns its raw trace.
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/// This callback should return \a None if the thread is not being traced.
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/// Otherwise, it should return the raw trace in bytes or an
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/// \a llvm::Error in case of failures.
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///
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/// \param[in] directory
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/// The directory where files will be saved when building the threads
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/// section.
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///
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/// \return
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/// The threads section or \a llvm::Error in case of failures.
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static llvm::Expected<std::vector<JSONThread>> BuildThreadsSection(
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Process &live_process,
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std::function<
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llvm::Expected<llvm::Optional<std::vector<uint8_t>>>(lldb::tid_t tid)>
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raw_trace_fetcher,
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FileSpec directory);
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/// Build modules sub-section of the trace's session. The original modules
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/// will be copied over to the \a <directory/modules> folder. Invalid modules
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/// are skipped.
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/// Copying the modules has the benefit of making these trace session
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/// directories self-contained, as the raw traces and modules are part of the
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/// output directory and can be sent to another machine, where lldb can load
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/// them and replicate exactly the same trace session.
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///
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/// \param[in] live_process
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/// The process being traced.
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///
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/// \param[in] directory
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/// The directory where the modules files will be saved when building
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/// the modules section.
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/// Example: If a module \a libbar.so exists in the path
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/// \a /usr/lib/foo/libbar.so, then it will be copied to
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/// \a <directory>/modules/usr/lib/foo/libbar.so.
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///
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/// \return
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/// The modules section or \a llvm::Error in case of failures.
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static llvm::Expected<std::vector<JSONModule>>
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BuildModulesSection(Process &live_process, FileSpec directory);
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};
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} // namespace lldb_private
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#endif // LLDB_TARGET_TRACESESSIONSAVER_H
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