llvm/llvm/tools/llvm-mca/CodeRegion.h

//===-------------------------- CodeRegion.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
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file implements class CodeRegion and CodeRegions, InstrumentRegion,
/// AnalysisRegions, and InstrumentRegions.
///
/// A CodeRegion describes a region of assembly code guarded by special LLVM-MCA
/// comment directives.
///
///   # LLVM-MCA-BEGIN foo
///     ...  ## asm
///   # LLVM-MCA-END
///
/// A comment starting with substring LLVM-MCA-BEGIN marks the beginning of a
/// new region of code.
/// A comment starting with substring LLVM-MCA-END marks the end of the
/// last-seen region of code.
///
/// Code regions are not allowed to overlap. Each region can have a optional
/// description; internally, regions are described by a range of source
/// locations (SMLoc objects).
///
/// An instruction (a MCInst) is added to a CodeRegion R only if its
/// location is in range [R.RangeStart, R.RangeEnd].
///
/// A InstrumentRegion describes a region of assembly code guarded by
/// special LLVM-MCA comment directives.
///
///   # LLVM-MCA-<INSTRUMENTATION_TYPE> <data>
///     ...  ## asm
///
/// where INSTRUMENTATION_TYPE is a type defined in llvm and expects to use
/// data.
///
/// A comment starting with substring LLVM-MCA-<INSTRUMENTATION_TYPE>
/// brings data into scope for llvm-mca to use in its analysis for
/// all following instructions.
///
/// If the same INSTRUMENTATION_TYPE is found later in the instruction list,
/// then the original InstrumentRegion will be automatically ended,
/// and a new InstrumentRegion will begin.
///
/// If there are comments containing the different INSTRUMENTATION_TYPEs,
/// then both data sets remain available. In contrast with a CodeRegion,
/// an InstrumentRegion does not need a comment to end the region.
//
// An instruction (a MCInst) is added to an InstrumentRegion R only
// if its location is in range [R.RangeStart, R.RangeEnd].
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TOOLS_LLVM_MCA_CODEREGION_H
#define LLVM_TOOLS_LLVM_MCA_CODEREGION_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MCA/CustomBehaviour.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/SMLoc.h"
#include "llvm/Support/SourceMgr.h"
#include <vector>

namespace llvm {
namespace mca {

/// A region of assembly code.
///
/// It identifies a sequence of machine instructions.
class CodeRegion { … };

/// Alias AnalysisRegion with CodeRegion since CodeRegionGenerator
/// is absract and AnalysisRegionGenerator operates on AnalysisRegions
AnalysisRegion;

/// A CodeRegion that contains instrumentation that can be used
/// in analysis of the region.
class InstrumentRegion : public CodeRegion { … };

class CodeRegionParseError final : public Error { … };

class CodeRegions { … };

struct AnalysisRegions : public CodeRegions { … };

struct InstrumentRegions : public CodeRegions { … };

} // namespace mca
} // namespace llvm

#endif