forked from OSchip/llvm-project
100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
//===-- xray_records.h ------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of XRay, a dynamic runtime instrumentation system.
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//
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// This header exposes some record types useful for the XRay in-memory logging
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// implementation.
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//
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//===----------------------------------------------------------------------===//
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#ifndef XRAY_XRAY_RECORDS_H
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#define XRAY_XRAY_RECORDS_H
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namespace __xray {
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enum FileTypes {
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NAIVE_LOG = 0,
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FDR_LOG = 1,
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};
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// FDR mode use of the union field in the XRayFileHeader.
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struct alignas(16) FdrAdditionalHeaderData {
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uint64_t ThreadBufferSize;
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};
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static_assert(sizeof(FdrAdditionalHeaderData) == 16,
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"FdrAdditionalHeaderData != 16 bytes");
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// This data structure is used to describe the contents of the file. We use this
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// for versioning the supported XRay file formats.
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struct alignas(32) XRayFileHeader {
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uint16_t Version = 0;
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// The type of file we're writing out. See the FileTypes enum for more
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// information. This allows different implementations of the XRay logging to
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// have different files for different information being stored.
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uint16_t Type = 0;
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// What follows are a set of flags that indicate useful things for when
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// reading the data in the file.
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bool ConstantTSC : 1;
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bool NonstopTSC : 1;
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// The frequency by which TSC increases per-second.
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alignas(8) uint64_t CycleFrequency = 0;
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union {
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char FreeForm[16];
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// The current civiltime timestamp, as retrived from 'clock_gettime'. This
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// allows readers of the file to determine when the file was created or
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// written down.
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struct timespec TS;
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struct FdrAdditionalHeaderData FdrData;
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};
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} __attribute__((packed));
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static_assert(sizeof(XRayFileHeader) == 32, "XRayFileHeader != 32 bytes");
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enum RecordTypes {
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NORMAL = 0,
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};
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struct alignas(32) XRayRecord {
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// This is the type of the record being written. We use 16 bits to allow us to
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// treat this as a discriminant, and so that the first 4 bytes get packed
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// properly. See RecordTypes for more supported types.
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uint16_t RecordType = 0;
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// The CPU where the thread is running. We assume number of CPUs <= 256.
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uint8_t CPU = 0;
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// The type of the event. Usually either ENTER = 0 or EXIT = 1.
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uint8_t Type = 0;
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// The function ID for the record.
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int32_t FuncId = 0;
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// Get the full 8 bytes of the TSC when we get the log record.
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uint64_t TSC = 0;
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// The thread ID for the currently running thread.
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uint32_t TId = 0;
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// Use some bytes in the end of the record for buffers.
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char Buffer[4] = {};
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} __attribute__((packed));
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static_assert(sizeof(XRayRecord) == 32, "XRayRecord != 32 bytes");
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} // namespace __xray
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#endif // XRAY_XRAY_RECORDS_H
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