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//===- XRayRecord.h - XRay Trace Record -----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file replicates the record definition for XRay log entries. This should
// follow the evolution of the log record versions supported in the compiler-rt
// xray project.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_XRAY_XRAY_RECORD_H
#define LLVM_XRAY_XRAY_RECORD_H
#include <cstdint>
namespace llvm {
namespace xray {
/// XRay traces all have a header providing some top-matter information useful
/// to help tools determine how to interpret the information available in the
/// trace.
struct XRayFileHeader {
/// Version of the XRay implementation that produced this file.
uint16_t Version = 0;
/// A numeric identifier for the type of file this is. Best used in
/// combination with Version.
uint16_t Type = 0;
/// Whether the CPU that produced the timestamp counters (TSC) move at a
/// constant rate.
bool ConstantTSC;
/// Whether the CPU that produced the timestamp counters (TSC) do not stop.
bool NonstopTSC;
/// The number of cycles per second for the CPU that produced the timestamp
/// counter (TSC) values. Useful for estimating the amount of time that
/// elapsed between two TSCs on some platforms.
uint64_t CycleFrequency = 0;
// This is different depending on the type of xray record. The naive format
// stores a Wallclock timespec. FDR logging stores the size of a thread
// buffer.
char FreeFormData[16];
};
/// Determines the supported types of records that could be seen in XRay traces.
/// This may or may not correspond to actual record types in the raw trace (as
/// the loader implementation may synthesize this information in the process of
/// of loading).
enum class RecordTypes { ENTER, EXIT, TAIL_EXIT, ENTER_ARG };
struct XRayRecord {
/// The type of record.
uint16_t RecordType;
/// The CPU where the thread is running. We assume number of CPUs <= 65536.
uint16_t CPU;
/// Identifies the type of record.
RecordTypes Type;
/// The function ID for the record.
int32_t FuncId;
/// Get the full 8 bytes of the TSC when we get the log record.
uint64_t TSC;
/// The thread ID for the currently running thread.
uint32_t TId;
/// The function call arguments.
std::vector<uint64_t> CallArgs;
};
} // namespace xray
} // namespace llvm
#endif // LLVM_XRAY_XRAY_RECORD_H
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