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//===-- xray_records.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
//
//===----------------------------------------------------------------------===//
//
// This file is a part of XRay, a dynamic runtime instrumentation system.
//
// This header exposes some record types useful for the XRay in-memory logging
// implementation.
//
//===----------------------------------------------------------------------===//
#ifndef XRAY_XRAY_RECORDS_H
#define XRAY_XRAY_RECORDS_H
#include <cstdint>
namespace __xray {
enum FileTypes {
NAIVE_LOG = 0,
FDR_LOG = 1,
};
// FDR mode use of the union field in the XRayFileHeader.
struct alignas(16) FdrAdditionalHeaderData {
uint64_t ThreadBufferSize;
};
static_assert(sizeof(FdrAdditionalHeaderData) == 16,
"FdrAdditionalHeaderData != 16 bytes");
// This data structure is used to describe the contents of the file. We use this
// for versioning the supported XRay file formats.
struct alignas(32) XRayFileHeader {
uint16_t Version = 0;
// The type of file we're writing out. See the FileTypes enum for more
// information. This allows different implementations of the XRay logging to
// have different files for different information being stored.
uint16_t Type = 0;
// What follows are a set of flags that indicate useful things for when
// reading the data in the file.
bool ConstantTSC : 1;
bool NonstopTSC : 1;
// The frequency by which TSC increases per-second.
alignas(8) uint64_t CycleFrequency = 0;
union {
char FreeForm[16];
// The current civiltime timestamp, as retrieved from 'clock_gettime'. This
// allows readers of the file to determine when the file was created or
// written down.
struct timespec TS;
struct FdrAdditionalHeaderData FdrData;
};
} __attribute__((packed));
static_assert(sizeof(XRayFileHeader) == 32, "XRayFileHeader != 32 bytes");
enum RecordTypes {
NORMAL = 0,
ARG_PAYLOAD = 1,
};
struct alignas(32) XRayRecord {
// This is the type of the record being written. We use 16 bits to allow us to
// treat this as a discriminant, and so that the first 4 bytes get packed
// properly. See RecordTypes for more supported types.
uint16_t RecordType = RecordTypes::NORMAL;
// The CPU where the thread is running. We assume number of CPUs <= 256.
uint8_t CPU = 0;
// The type of the event. One of the following:
// ENTER = 0
// EXIT = 1
// TAIL_EXIT = 2
// ENTER_ARG = 3
uint8_t Type = 0;
// The function ID for the record.
int32_t FuncId = 0;
// Get the full 8 bytes of the TSC when we get the log record.
uint64_t TSC = 0;
// The thread ID for the currently running thread.
uint32_t TId = 0;
// The ID of process that is currently running
uint32_t PId = 0;
// Use some bytes in the end of the record for buffers.
char Buffer[8] = {};
} __attribute__((packed));
static_assert(sizeof(XRayRecord) == 32, "XRayRecord != 32 bytes");
struct alignas(32) XRayArgPayload {
// We use the same 16 bits as a discriminant for the records in the log here
// too, and so that the first 4 bytes are packed properly.
uint16_t RecordType = RecordTypes::ARG_PAYLOAD;
// Add a few bytes to pad.
uint8_t Padding[2] = {};
// The function ID for the record.
int32_t FuncId = 0;
// The thread ID for the currently running thread.
uint32_t TId = 0;
// The ID of process that is currently running
uint32_t PId = 0;
// The argument payload.
uint64_t Arg = 0;
// The rest of this record ought to be left as padding.
uint8_t TailPadding[8] = {};
} __attribute__((packed));
static_assert(sizeof(XRayArgPayload) == 32, "XRayArgPayload != 32 bytes");
} // namespace __xray
#endif // XRAY_XRAY_RECORDS_H