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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
//===-------------------------- CodeRegion.h -------------------*- C++ -* -===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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///
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/// This file implements class CodeRegion and CodeRegions.
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///
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/// A CodeRegion describes a region of assembly code guarded by special LLVM-MCA
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/// comment directives.
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///
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/// # LLVM-MCA-BEGIN foo
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/// ... ## asm
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/// # LLVM-MCA-END
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///
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/// A comment starting with substring LLVM-MCA-BEGIN marks the beginning of a
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/// new region of code.
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/// A comment starting with substring LLVM-MCA-END marks the end of the
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/// last-seen region of code.
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///
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/// Code regions are not allowed to overlap. Each region can have a optional
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/// description; internally, regions are described by a range of source
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/// locations (SMLoc objects).
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///
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/// An instruction (a MCInst) is added to a region R only if its location is in
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/// range [R.RangeStart, R.RangeEnd].
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_CODEREGION_H
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#define LLVM_TOOLS_LLVM_MCA_CODEREGION_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/Support/SMLoc.h"
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#include "llvm/Support/SourceMgr.h"
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#include <vector>
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namespace llvm {
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namespace mca {
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/// A region of assembly code.
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///
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/// It identifies a sequence of machine instructions.
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class CodeRegion {
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// An optional descriptor for this region.
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llvm::StringRef Description;
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// Instructions that form this region.
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std::vector<llvm::MCInst> Instructions;
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// Source location range.
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llvm::SMLoc RangeStart;
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llvm::SMLoc RangeEnd;
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CodeRegion(const CodeRegion &) = delete;
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CodeRegion &operator=(const CodeRegion &) = delete;
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public:
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CodeRegion(llvm::StringRef Desc, llvm::SMLoc Start)
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: Description(Desc), RangeStart(Start), RangeEnd() {}
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void addInstruction(const llvm::MCInst &Instruction) {
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Instructions.emplace_back(Instruction);
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}
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llvm::SMLoc startLoc() const { return RangeStart; }
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llvm::SMLoc endLoc() const { return RangeEnd; }
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void setEndLocation(llvm::SMLoc End) { RangeEnd = End; }
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bool empty() const { return Instructions.empty(); }
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bool isLocInRange(llvm::SMLoc Loc) const;
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llvm::ArrayRef<llvm::MCInst> getInstructions() const { return Instructions; }
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llvm::StringRef getDescription() const { return Description; }
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};
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class CodeRegions {
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// A source manager. Used by the tool to generate meaningful warnings.
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llvm::SourceMgr &SM;
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std::vector<std::unique_ptr<CodeRegion>> Regions;
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// Construct a new region of code guarded by LLVM-MCA comments.
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void addRegion(llvm::StringRef Description, llvm::SMLoc Loc) {
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Regions.emplace_back(llvm::make_unique<CodeRegion>(Description, Loc));
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}
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CodeRegions(const CodeRegions &) = delete;
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CodeRegions &operator=(const CodeRegions &) = delete;
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public:
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typedef std::vector<std::unique_ptr<CodeRegion>>::iterator iterator;
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typedef std::vector<std::unique_ptr<CodeRegion>>::const_iterator
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const_iterator;
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iterator begin() { return Regions.begin(); }
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iterator end() { return Regions.end(); }
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const_iterator begin() const { return Regions.cbegin(); }
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const_iterator end() const { return Regions.cend(); }
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void beginRegion(llvm::StringRef Description, llvm::SMLoc Loc);
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void endRegion(llvm::SMLoc Loc);
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void addInstruction(const llvm::MCInst &Instruction);
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llvm::SourceMgr &getSourceMgr() const { return SM; }
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CodeRegions(llvm::SourceMgr &S) : SM(S) {
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// Create a default region for the input code sequence.
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addRegion("Default", llvm::SMLoc());
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}
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llvm::ArrayRef<llvm::MCInst> getInstructionSequence(unsigned Idx) const {
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return Regions[Idx]->getInstructions();
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}
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bool empty() const {
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return llvm::all_of(Regions, [](const std::unique_ptr<CodeRegion> &Region) {
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return Region->empty();
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});
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}
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};
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} // namespace mca
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} // namespace llvm
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#endif
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