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//===-- ProcessorTrace.h -------------------------------------- -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ProcessorTrace_H_
#define liblldb_ProcessorTrace_H_
#include "lldb/Utility/Status.h"
#include "lldb/Utility/TraceOptions.h"
#include "lldb/lldb-types.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include <linux/perf_event.h>
#include <sys/mman.h>
#include <unistd.h>
namespace lldb_private {
namespace process_linux {
// This class keeps track of one tracing instance of
// Intel(R) Processor Trace on Linux OS. There is a map keeping track
// of different tracing instances on each thread, which enables trace
// gathering on a per thread level.
//
// The tracing instance is linked with a trace id. The trace id acts like
// a key to the tracing instance and trace manipulations could be
// performed using the trace id.
//
// The trace id could map to trace instances for a group of threads
// (spanning to all the threads in the process) or a single thread.
// The kernel interface for us is the perf_event_open.
class ProcessorTraceMonitor;
typedef std::unique_ptr<ProcessorTraceMonitor> ProcessorTraceMonitorUP;
class ProcessorTraceMonitor {
class munmap_delete {
size_t m_length;
public:
munmap_delete(size_t length) : m_length(length) {}
void operator()(void *ptr) {
if (m_length)
munmap(ptr, m_length);
}
};
class file_close {
public:
file_close() = default;
void operator()(int *ptr) {
if (ptr == nullptr)
return;
if (*ptr == -1)
return;
close(*ptr);
std::default_delete<int>()(ptr);
}
};
std::unique_ptr<perf_event_mmap_page, munmap_delete> m_mmap_meta;
std::unique_ptr<uint8_t, munmap_delete> m_mmap_aux;
std::unique_ptr<int, file_close> m_fd;
// perf_event_mmap_page *m_mmap_base;
lldb::user_id_t m_traceid;
lldb::tid_t m_thread_id;
// Counter to track trace instances.
static lldb::user_id_t m_trace_num;
void SetTraceID(lldb::user_id_t traceid) { m_traceid = traceid; }
Status StartTrace(lldb::pid_t pid, lldb::tid_t tid,
const TraceOptions &config);
llvm::MutableArrayRef<uint8_t> GetAuxBuffer();
llvm::MutableArrayRef<uint8_t> GetDataBuffer();
ProcessorTraceMonitor()
: m_mmap_meta(nullptr, munmap_delete(0)),
m_mmap_aux(nullptr, munmap_delete(0)), m_fd(nullptr, file_close()),
m_traceid(LLDB_INVALID_UID), m_thread_id(LLDB_INVALID_THREAD_ID){};
void SetThreadID(lldb::tid_t tid) { m_thread_id = tid; }
public:
static Status GetCPUType(TraceOptions &config);
static llvm::Expected<ProcessorTraceMonitorUP>
Create(lldb::pid_t pid, lldb::tid_t tid, const TraceOptions &config,
bool useProcessSettings);
Status ReadPerfTraceAux(llvm::MutableArrayRef<uint8_t> &buffer,
size_t offset = 0);
Status ReadPerfTraceData(llvm::MutableArrayRef<uint8_t> &buffer,
size_t offset = 0);
~ProcessorTraceMonitor() = default;
lldb::tid_t GetThreadID() const { return m_thread_id; }
lldb::user_id_t GetTraceID() const { return m_traceid; }
Status GetTraceConfig(TraceOptions &config) const;
/// Read data from a cyclic buffer
///
/// \param[in] [out] buf
/// Destination buffer, the buffer will be truncated to written size.
///
/// \param[in] src
/// Source buffer which must be a cyclic buffer.
///
/// \param[in] src_cyc_index
/// The index pointer (start of the valid data in the cyclic
/// buffer).
///
/// \param[in] offset
/// The offset to begin reading the data in the cyclic buffer.
static void ReadCyclicBuffer(llvm::MutableArrayRef<uint8_t> &dst,
llvm::MutableArrayRef<uint8_t> src,
size_t src_cyc_index, size_t offset);
};
} // namespace process_linux
} // namespace lldb_private
#endif
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