llvm/llvm/lib/ExecutionEngine/Orc/Debugging/PerfSupportPlugin.cpp

//===----- PerfSupportPlugin.cpp --- Utils for perf support -----*- 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
//
//===----------------------------------------------------------------------===//
//
// Handles support for registering code with perf
//
//===----------------------------------------------------------------------===//

#include "llvm/ExecutionEngine/Orc/Debugging/PerfSupportPlugin.h"

#include "llvm/ExecutionEngine/JITLink/x86_64.h"
#include "llvm/ExecutionEngine/Orc/Debugging/DebugInfoSupport.h"
#include "llvm/ExecutionEngine/Orc/LookupAndRecordAddrs.h"
#include "llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h"

#define DEBUG_TYPE …

usingnamespacellvm;
usingnamespacellvm::orc;
usingnamespacellvm::jitlink;

namespace {

// Creates an EH frame header prepared for a 32-bit relative relocation
// to the start of the .eh_frame section. Absolute injects a 64-bit absolute
// address space offset 4 bytes from the start instead of 4 bytes
Expected<std::string> createX64EHFrameHeader(Section &EHFrame,
                                             llvm::endianness endianness,
                                             bool absolute) { … }

constexpr StringRef RegisterPerfStartSymbolName = …;
constexpr StringRef RegisterPerfEndSymbolName = …;
constexpr StringRef RegisterPerfImplSymbolName = …;

static PerfJITCodeLoadRecord
getCodeLoadRecord(const Symbol &Sym, std::atomic<uint64_t> &CodeIndex) { … }

static std::optional<PerfJITDebugInfoRecord>
getDebugInfoRecord(const Symbol &Sym, DWARFContext &DC) { … }

static Expected<PerfJITCodeUnwindingInfoRecord>
getUnwindingRecord(LinkGraph &G) { … }

static PerfJITRecordBatch getRecords(ExecutionSession &ES, LinkGraph &G,
                                     std::atomic<uint64_t> &CodeIndex,
                                     bool EmitDebugInfo, bool EmitUnwindInfo) { … }
} // namespace

PerfSupportPlugin::PerfSupportPlugin(ExecutorProcessControl &EPC,
                                     ExecutorAddr RegisterPerfStartAddr,
                                     ExecutorAddr RegisterPerfEndAddr,
                                     ExecutorAddr RegisterPerfImplAddr,
                                     bool EmitDebugInfo, bool EmitUnwindInfo)
    : … { … }
PerfSupportPlugin::~PerfSupportPlugin() { … }

void PerfSupportPlugin::modifyPassConfig(MaterializationResponsibility &MR,
                                         LinkGraph &G,
                                         PassConfiguration &Config) { … }

Expected<std::unique_ptr<PerfSupportPlugin>>
PerfSupportPlugin::Create(ExecutorProcessControl &EPC, JITDylib &JD,
                          bool EmitDebugInfo, bool EmitUnwindInfo) { … }