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//===-------------------------- 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/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 {
// An optional descriptor for this region.
llvm::StringRef Description;
// Instructions that form this region.
llvm::SmallVector<llvm::MCInst, 16> Instructions;
// Source location range.
llvm::SMLoc RangeStart;
llvm::SMLoc RangeEnd;
CodeRegion(const CodeRegion &) = delete;
CodeRegion &operator=(const CodeRegion &) = delete;
public:
CodeRegion(llvm::StringRef Desc, llvm::SMLoc Start)
: Description(Desc), RangeStart(Start) {}
virtual ~CodeRegion() = default;
void addInstruction(const llvm::MCInst &Instruction) {
Instructions.emplace_back(Instruction);
}
llvm::SMLoc startLoc() const { return RangeStart; }
llvm::SMLoc endLoc() const { return RangeEnd; }
void setEndLocation(llvm::SMLoc End) { RangeEnd = End; }
bool empty() const { return Instructions.empty(); }
bool isLocInRange(llvm::SMLoc Loc) const;
llvm::ArrayRef<llvm::MCInst> getInstructions() const { return Instructions; }
llvm::StringRef getDescription() const { return Description; }
};
/// Alias AnalysisRegion with CodeRegion since CodeRegionGenerator
/// is absract and AnalysisRegionGenerator operates on AnalysisRegions
using AnalysisRegion = CodeRegion;
/// A CodeRegion that contains instrumentation that can be used
/// in analysis of the region.
class InstrumentRegion : public CodeRegion {
/// Instrument for this region.
UniqueInstrument I;
public:
InstrumentRegion(llvm::StringRef Desc, llvm::SMLoc Start, UniqueInstrument I)
: CodeRegion(Desc, Start), I(std::move(I)) {}
public:
Instrument *getInstrument() const { return I.get(); }
};
class CodeRegionParseError final : public Error {};
class CodeRegions {
CodeRegions(const CodeRegions &) = delete;
CodeRegions &operator=(const CodeRegions &) = delete;
protected:
// A source manager. Used by the tool to generate meaningful warnings.
llvm::SourceMgr &SM;
using UniqueCodeRegion = std::unique_ptr<CodeRegion>;
std::vector<UniqueCodeRegion> Regions;
llvm::StringMap<unsigned> ActiveRegions;
bool FoundErrors;
public:
CodeRegions(llvm::SourceMgr &S) : SM(S), FoundErrors(false) {}
virtual ~CodeRegions() = default;
typedef std::vector<UniqueCodeRegion>::iterator iterator;
typedef std::vector<UniqueCodeRegion>::const_iterator const_iterator;
iterator begin() { return Regions.begin(); }
iterator end() { return Regions.end(); }
const_iterator begin() const { return Regions.cbegin(); }
const_iterator end() const { return Regions.cend(); }
void addInstruction(const llvm::MCInst &Instruction);
llvm::SourceMgr &getSourceMgr() const { return SM; }
llvm::ArrayRef<llvm::MCInst> getInstructionSequence(unsigned Idx) const {
return Regions[Idx]->getInstructions();
}
bool empty() const {
return llvm::all_of(Regions, [](const UniqueCodeRegion &Region) {
return Region->empty();
});
}
bool isValid() const { return !FoundErrors; }
bool isRegionActive(llvm::StringRef Description) const {
return ActiveRegions.contains(Description);
}
virtual void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc) = 0;
virtual void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc,
UniqueInstrument Instrument) = 0;
virtual void endRegion(llvm::StringRef Description, llvm::SMLoc Loc) = 0;
};
struct AnalysisRegions : public CodeRegions {
AnalysisRegions(llvm::SourceMgr &S);
void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc) override;
void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc,
UniqueInstrument Instrument) override {}
void endRegion(llvm::StringRef Description, llvm::SMLoc Loc) override;
};
struct InstrumentRegions : public CodeRegions {
InstrumentRegions(llvm::SourceMgr &S);
void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc) override{};
void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc,
UniqueInstrument Instrument) override;
void endRegion(llvm::StringRef Description, llvm::SMLoc Loc) override;
const SmallVector<Instrument *> getActiveInstruments(llvm::SMLoc Loc) const;
};
} // namespace mca
} // namespace llvm
#endif
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