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//===- OpenMPClause.h - Classes for OpenMP clauses --------------*- 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 defines OpenMP AST classes for clauses.
/// There are clauses for executable directives, clauses for declarative
/// directives and clauses which can be used in both kinds of directives.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_OPENMPCLAUSE_H
#define LLVM_CLANG_AST_OPENMPCLAUSE_H

#include "clang/AST/ASTFwd.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclarationName.h"
#include "clang/AST/Expr.h"
#include "clang/AST/NestedNameSpecifier.h"
#include "clang/AST/Stmt.h"
#include "clang/AST/StmtIterator.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/OpenMPKinds.h"
#include "clang/Basic/SourceLocation.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/iterator.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Frontend/OpenMP/OMPAssume.h"
#include "llvm/Frontend/OpenMP/OMPConstants.h"
#include "llvm/Frontend/OpenMP/OMPContext.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/TrailingObjects.h"
#include <cassert>
#include <cstddef>
#include <iterator>
#include <utility>

namespace clang {

class ASTContext;

//===----------------------------------------------------------------------===//
// AST classes for clauses.
//===----------------------------------------------------------------------===//

/// This is a basic class for representing single OpenMP clause.
class OMPClause {
  /// Starting location of the clause (the clause keyword).
  SourceLocation StartLoc;

  /// Ending location of the clause.
  SourceLocation EndLoc;

  /// Kind of the clause.
  OpenMPClauseKind Kind;

protected:
  OMPClause(OpenMPClauseKind K, SourceLocation StartLoc, SourceLocation EndLoc)
      : StartLoc(StartLoc), EndLoc(EndLoc), Kind(K) {}

public:
  /// Returns the starting location of the clause.
  SourceLocation getBeginLoc() const { return StartLoc; }

  /// Returns the ending location of the clause.
  SourceLocation getEndLoc() const { return EndLoc; }

  /// Sets the starting location of the clause.
  void setLocStart(SourceLocation Loc) { StartLoc = Loc; }

  /// Sets the ending location of the clause.
  void setLocEnd(SourceLocation Loc) { EndLoc = Loc; }

  /// Returns kind of OpenMP clause (private, shared, reduction, etc.).
  OpenMPClauseKind getClauseKind() const { return Kind; }

  bool isImplicit() const { return StartLoc.isInvalid(); }

  using child_iterator = StmtIterator;
  using const_child_iterator = ConstStmtIterator;
  using child_range = llvm::iterator_range<child_iterator>;
  using const_child_range = llvm::iterator_range<const_child_iterator>;

  child_range children();
  const_child_range children() const {
    auto Children = const_cast<OMPClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  /// Get the iterator range for the expressions used in the clauses. Used
  /// expressions include only the children that must be evaluated at the
  /// runtime before entering the construct.
  child_range used_children();
  const_child_range used_children() const {
    auto Children = const_cast<OMPClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  static bool classof(const OMPClause *) { return true; }
};

/// Class that handles pre-initialization statement for some clauses, like
/// 'shedule', 'firstprivate' etc.
class OMPClauseWithPreInit {
  friend class OMPClauseReader;

  /// Pre-initialization statement for the clause.
  Stmt *PreInit = nullptr;

  /// Region that captures the associated stmt.
  OpenMPDirectiveKind CaptureRegion = llvm::omp::OMPD_unknown;

protected:
  OMPClauseWithPreInit(const OMPClause *This) {
    assert(get(This) && "get is not tuned for pre-init.");
  }

  /// Set pre-initialization statement for the clause.
  void
  setPreInitStmt(Stmt *S,
                 OpenMPDirectiveKind ThisRegion = llvm::omp::OMPD_unknown) {
    PreInit = S;
    CaptureRegion = ThisRegion;
  }

public:
  /// Get pre-initialization statement for the clause.
  const Stmt *getPreInitStmt() const { return PreInit; }

  /// Get pre-initialization statement for the clause.
  Stmt *getPreInitStmt() { return PreInit; }

  /// Get capture region for the stmt in the clause.
  OpenMPDirectiveKind getCaptureRegion() const { return CaptureRegion; }

  static OMPClauseWithPreInit *get(OMPClause *C);
  static const OMPClauseWithPreInit *get(const OMPClause *C);
};

/// Class that handles post-update expression for some clauses, like
/// 'lastprivate', 'reduction' etc.
class OMPClauseWithPostUpdate : public OMPClauseWithPreInit {
  friend class OMPClauseReader;

  /// Post-update expression for the clause.
  Expr *PostUpdate = nullptr;

protected:
  OMPClauseWithPostUpdate(const OMPClause *This) : OMPClauseWithPreInit(This) {
    assert(get(This) && "get is not tuned for post-update.");
  }

  /// Set pre-initialization statement for the clause.
  void setPostUpdateExpr(Expr *S) { PostUpdate = S; }

public:
  /// Get post-update expression for the clause.
  const Expr *getPostUpdateExpr() const { return PostUpdate; }

  /// Get post-update expression for the clause.
  Expr *getPostUpdateExpr() { return PostUpdate; }

  static OMPClauseWithPostUpdate *get(OMPClause *C);
  static const OMPClauseWithPostUpdate *get(const OMPClause *C);
};

/// This structure contains most locations needed for by an OMPVarListClause.
struct OMPVarListLocTy {
  /// Starting location of the clause (the clause keyword).
  SourceLocation StartLoc;
  /// Location of '('.
  SourceLocation LParenLoc;
  /// Ending location of the clause.
  SourceLocation EndLoc;
  OMPVarListLocTy() = default;
  OMPVarListLocTy(SourceLocation StartLoc, SourceLocation LParenLoc,
                  SourceLocation EndLoc)
      : StartLoc(StartLoc), LParenLoc(LParenLoc), EndLoc(EndLoc) {}
};

/// This represents clauses with the list of variables like 'private',
/// 'firstprivate', 'copyin', 'shared', or 'reduction' clauses in the
/// '#pragma omp ...' directives.
template <class T> class OMPVarListClause : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Number of variables in the list.
  unsigned NumVars;

protected:
  /// Build a clause with \a N variables
  ///
  /// \param K Kind of the clause.
  /// \param StartLoc Starting location of the clause (the clause keyword).
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param N Number of the variables in the clause.
  OMPVarListClause(OpenMPClauseKind K, SourceLocation StartLoc,
                   SourceLocation LParenLoc, SourceLocation EndLoc, unsigned N)
      : OMPClause(K, StartLoc, EndLoc), LParenLoc(LParenLoc), NumVars(N) {}

  /// Fetches list of variables associated with this clause.
  MutableArrayRef<Expr *> getVarRefs() {
    return MutableArrayRef<Expr *>(
        static_cast<T *>(this)->template getTrailingObjects<Expr *>(), NumVars);
  }

  /// Sets the list of variables for this clause.
  void setVarRefs(ArrayRef<Expr *> VL) {
    assert(VL.size() == NumVars &&
           "Number of variables is not the same as the preallocated buffer");
    std::copy(VL.begin(), VL.end(),
              static_cast<T *>(this)->template getTrailingObjects<Expr *>());
  }

public:
  using varlist_iterator = MutableArrayRef<Expr *>::iterator;
  using varlist_const_iterator = ArrayRef<const Expr *>::iterator;
  using varlist_range = llvm::iterator_range<varlist_iterator>;
  using varlist_const_range = llvm::iterator_range<varlist_const_iterator>;

  unsigned varlist_size() const { return NumVars; }
  bool varlist_empty() const { return NumVars == 0; }

  varlist_range varlists() {
    return varlist_range(varlist_begin(), varlist_end());
  }
  varlist_const_range varlists() const {
    return varlist_const_range(varlist_begin(), varlist_end());
  }

  varlist_iterator varlist_begin() { return getVarRefs().begin(); }
  varlist_iterator varlist_end() { return getVarRefs().end(); }
  varlist_const_iterator varlist_begin() const { return getVarRefs().begin(); }
  varlist_const_iterator varlist_end() const { return getVarRefs().end(); }

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Fetches list of all variables in the clause.
  ArrayRef<const Expr *> getVarRefs() const {
    return llvm::makeArrayRef(
        static_cast<const T *>(this)->template getTrailingObjects<Expr *>(),
        NumVars);
  }
};

/// This represents 'allocator' clause in the '#pragma omp ...'
/// directive.
///
/// \code
/// #pragma omp allocate(a) allocator(omp_default_mem_alloc)
/// \endcode
/// In this example directive '#pragma omp allocate' has simple 'allocator'
/// clause with the allocator 'omp_default_mem_alloc'.
class OMPAllocatorClause : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Expression with the allocator.
  Stmt *Allocator = nullptr;

  /// Set allocator.
  void setAllocator(Expr *A) { Allocator = A; }

public:
  /// Build 'allocator' clause with the given allocator.
  ///
  /// \param A Allocator.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPAllocatorClause(Expr *A, SourceLocation StartLoc, SourceLocation LParenLoc,
                     SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_allocator, StartLoc, EndLoc),
        LParenLoc(LParenLoc), Allocator(A) {}

  /// Build an empty clause.
  OMPAllocatorClause()
      : OMPClause(llvm::omp::OMPC_allocator, SourceLocation(),
                  SourceLocation()) {}

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns allocator.
  Expr *getAllocator() const { return cast_or_null<Expr>(Allocator); }

  child_range children() { return child_range(&Allocator, &Allocator + 1); }

  const_child_range children() const {
    return const_child_range(&Allocator, &Allocator + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_allocator;
  }
};

/// This represents the 'align' clause in the '#pragma omp allocate'
/// directive.
///
/// \code
/// #pragma omp allocate(a) allocator(omp_default_mem_alloc) align(8)
/// \endcode
/// In this example directive '#pragma omp allocate' has simple 'allocator'
/// clause with the allocator 'omp_default_mem_alloc' and align clause with
/// value of 8.
class OMPAlignClause final : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Alignment specified with align clause.
  Stmt *Alignment = nullptr;

  /// Set alignment value.
  void setAlignment(Expr *A) { Alignment = A; }

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Build 'align' clause with the given alignment
  ///
  /// \param A Alignment value.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPAlignClause(Expr *A, SourceLocation StartLoc, SourceLocation LParenLoc,
                 SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_align, StartLoc, EndLoc),
        LParenLoc(LParenLoc), Alignment(A) {}

  /// Build an empty clause.
  OMPAlignClause()
      : OMPClause(llvm::omp::OMPC_align, SourceLocation(), SourceLocation()) {}

public:
  /// Build 'align' clause with the given alignment
  ///
  /// \param A Alignment value.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  static OMPAlignClause *Create(const ASTContext &C, Expr *A,
                                SourceLocation StartLoc,
                                SourceLocation LParenLoc,
                                SourceLocation EndLoc);

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns alignment
  Expr *getAlignment() const { return cast_or_null<Expr>(Alignment); }

  child_range children() { return child_range(&Alignment, &Alignment + 1); }

  const_child_range children() const {
    return const_child_range(&Alignment, &Alignment + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_align;
  }
};

/// This represents clause 'allocate' in the '#pragma omp ...' directives.
///
/// \code
/// #pragma omp parallel private(a) allocate(omp_default_mem_alloc :a)
/// \endcode
/// In this example directive '#pragma omp parallel' has clause 'private'
/// and clause 'allocate' for the variable 'a'.
class OMPAllocateClause final
    : public OMPVarListClause<OMPAllocateClause>,
      private llvm::TrailingObjects<OMPAllocateClause, Expr *> {
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Allocator specified in the clause, or 'nullptr' if the default one is
  /// used.
  Expr *Allocator = nullptr;
  /// Position of the ':' delimiter in the clause;
  SourceLocation ColonLoc;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param Allocator Allocator expression.
  /// \param ColonLoc Location of ':' delimiter.
  /// \param EndLoc Ending location of the clause.
  /// \param N Number of the variables in the clause.
  OMPAllocateClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                    Expr *Allocator, SourceLocation ColonLoc,
                    SourceLocation EndLoc, unsigned N)
      : OMPVarListClause<OMPAllocateClause>(llvm::omp::OMPC_allocate, StartLoc,
                                            LParenLoc, EndLoc, N),
        Allocator(Allocator), ColonLoc(ColonLoc) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPAllocateClause(unsigned N)
      : OMPVarListClause<OMPAllocateClause>(llvm::omp::OMPC_allocate,
                                            SourceLocation(), SourceLocation(),
                                            SourceLocation(), N) {}

  /// Sets location of ':' symbol in clause.
  void setColonLoc(SourceLocation CL) { ColonLoc = CL; }

  void setAllocator(Expr *A) { Allocator = A; }

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param C AST context.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param Allocator Allocator expression.
  /// \param ColonLoc Location of ':' delimiter.
  /// \param EndLoc Ending location of the clause.
  /// \param VL List of references to the variables.
  static OMPAllocateClause *Create(const ASTContext &C, SourceLocation StartLoc,
                                   SourceLocation LParenLoc, Expr *Allocator,
                                   SourceLocation ColonLoc,
                                   SourceLocation EndLoc, ArrayRef<Expr *> VL);

  /// Returns the allocator expression or nullptr, if no allocator is specified.
  Expr *getAllocator() const { return Allocator; }

  /// Returns the location of the ':' delimiter.
  SourceLocation getColonLoc() const { return ColonLoc; }

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  static OMPAllocateClause *CreateEmpty(const ASTContext &C, unsigned N);

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPAllocateClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_allocate;
  }
};

/// This represents 'if' clause in the '#pragma omp ...' directive.
///
/// \code
/// #pragma omp parallel if(parallel:a > 5)
/// \endcode
/// In this example directive '#pragma omp parallel' has simple 'if' clause with
/// condition 'a > 5' and directive name modifier 'parallel'.
class OMPIfClause : public OMPClause, public OMPClauseWithPreInit {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Condition of the 'if' clause.
  Stmt *Condition = nullptr;

  /// Location of ':' (if any).
  SourceLocation ColonLoc;

  /// Directive name modifier for the clause.
  OpenMPDirectiveKind NameModifier = llvm::omp::OMPD_unknown;

  /// Name modifier location.
  SourceLocation NameModifierLoc;

  /// Set condition.
  void setCondition(Expr *Cond) { Condition = Cond; }

  /// Set directive name modifier for the clause.
  void setNameModifier(OpenMPDirectiveKind NM) { NameModifier = NM; }

  /// Set location of directive name modifier for the clause.
  void setNameModifierLoc(SourceLocation Loc) { NameModifierLoc = Loc; }

  /// Set location of ':'.
  void setColonLoc(SourceLocation Loc) { ColonLoc = Loc; }

public:
  /// Build 'if' clause with condition \a Cond.
  ///
  /// \param NameModifier [OpenMP 4.1] Directive name modifier of clause.
  /// \param Cond Condition of the clause.
  /// \param HelperCond Helper condition for the clause.
  /// \param CaptureRegion Innermost OpenMP region where expressions in this
  /// clause must be captured.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param NameModifierLoc Location of directive name modifier.
  /// \param ColonLoc [OpenMP 4.1] Location of ':'.
  /// \param EndLoc Ending location of the clause.
  OMPIfClause(OpenMPDirectiveKind NameModifier, Expr *Cond, Stmt *HelperCond,
              OpenMPDirectiveKind CaptureRegion, SourceLocation StartLoc,
              SourceLocation LParenLoc, SourceLocation NameModifierLoc,
              SourceLocation ColonLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_if, StartLoc, EndLoc),
        OMPClauseWithPreInit(this), LParenLoc(LParenLoc), Condition(Cond),
        ColonLoc(ColonLoc), NameModifier(NameModifier),
        NameModifierLoc(NameModifierLoc) {
    setPreInitStmt(HelperCond, CaptureRegion);
  }

  /// Build an empty clause.
  OMPIfClause()
      : OMPClause(llvm::omp::OMPC_if, SourceLocation(), SourceLocation()),
        OMPClauseWithPreInit(this) {}

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Return the location of ':'.
  SourceLocation getColonLoc() const { return ColonLoc; }

  /// Returns condition.
  Expr *getCondition() const { return cast_or_null<Expr>(Condition); }

  /// Return directive name modifier associated with the clause.
  OpenMPDirectiveKind getNameModifier() const { return NameModifier; }

  /// Return the location of directive name modifier.
  SourceLocation getNameModifierLoc() const { return NameModifierLoc; }

  child_range children() { return child_range(&Condition, &Condition + 1); }

  const_child_range children() const {
    return const_child_range(&Condition, &Condition + 1);
  }

  child_range used_children();
  const_child_range used_children() const {
    auto Children = const_cast<OMPIfClause *>(this)->used_children();
    return const_child_range(Children.begin(), Children.end());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_if;
  }
};

/// This represents 'final' clause in the '#pragma omp ...' directive.
///
/// \code
/// #pragma omp task final(a > 5)
/// \endcode
/// In this example directive '#pragma omp task' has simple 'final'
/// clause with condition 'a > 5'.
class OMPFinalClause : public OMPClause, public OMPClauseWithPreInit {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Condition of the 'if' clause.
  Stmt *Condition = nullptr;

  /// Set condition.
  void setCondition(Expr *Cond) { Condition = Cond; }

public:
  /// Build 'final' clause with condition \a Cond.
  ///
  /// \param Cond Condition of the clause.
  /// \param HelperCond Helper condition for the construct.
  /// \param CaptureRegion Innermost OpenMP region where expressions in this
  /// clause must be captured.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPFinalClause(Expr *Cond, Stmt *HelperCond,
                 OpenMPDirectiveKind CaptureRegion, SourceLocation StartLoc,
                 SourceLocation LParenLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_final, StartLoc, EndLoc),
        OMPClauseWithPreInit(this), LParenLoc(LParenLoc), Condition(Cond) {
    setPreInitStmt(HelperCond, CaptureRegion);
  }

  /// Build an empty clause.
  OMPFinalClause()
      : OMPClause(llvm::omp::OMPC_final, SourceLocation(), SourceLocation()),
        OMPClauseWithPreInit(this) {}

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns condition.
  Expr *getCondition() const { return cast_or_null<Expr>(Condition); }

  child_range children() { return child_range(&Condition, &Condition + 1); }

  const_child_range children() const {
    return const_child_range(&Condition, &Condition + 1);
  }

  child_range used_children();
  const_child_range used_children() const {
    auto Children = const_cast<OMPFinalClause *>(this)->used_children();
    return const_child_range(Children.begin(), Children.end());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_final;
  }
};

/// This represents 'num_threads' clause in the '#pragma omp ...'
/// directive.
///
/// \code
/// #pragma omp parallel num_threads(6)
/// \endcode
/// In this example directive '#pragma omp parallel' has simple 'num_threads'
/// clause with number of threads '6'.
class OMPNumThreadsClause : public OMPClause, public OMPClauseWithPreInit {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Condition of the 'num_threads' clause.
  Stmt *NumThreads = nullptr;

  /// Set condition.
  void setNumThreads(Expr *NThreads) { NumThreads = NThreads; }

public:
  /// Build 'num_threads' clause with condition \a NumThreads.
  ///
  /// \param NumThreads Number of threads for the construct.
  /// \param HelperNumThreads Helper Number of threads for the construct.
  /// \param CaptureRegion Innermost OpenMP region where expressions in this
  /// clause must be captured.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPNumThreadsClause(Expr *NumThreads, Stmt *HelperNumThreads,
                      OpenMPDirectiveKind CaptureRegion,
                      SourceLocation StartLoc, SourceLocation LParenLoc,
                      SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_num_threads, StartLoc, EndLoc),
        OMPClauseWithPreInit(this), LParenLoc(LParenLoc),
        NumThreads(NumThreads) {
    setPreInitStmt(HelperNumThreads, CaptureRegion);
  }

  /// Build an empty clause.
  OMPNumThreadsClause()
      : OMPClause(llvm::omp::OMPC_num_threads, SourceLocation(),
                  SourceLocation()),
        OMPClauseWithPreInit(this) {}

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns number of threads.
  Expr *getNumThreads() const { return cast_or_null<Expr>(NumThreads); }

  child_range children() { return child_range(&NumThreads, &NumThreads + 1); }

  const_child_range children() const {
    return const_child_range(&NumThreads, &NumThreads + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_num_threads;
  }
};

/// This represents 'safelen' clause in the '#pragma omp ...'
/// directive.
///
/// \code
/// #pragma omp simd safelen(4)
/// \endcode
/// In this example directive '#pragma omp simd' has clause 'safelen'
/// with single expression '4'.
/// If the safelen clause is used then no two iterations executed
/// concurrently with SIMD instructions can have a greater distance
/// in the logical iteration space than its value. The parameter of
/// the safelen clause must be a constant positive integer expression.
class OMPSafelenClause : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Safe iteration space distance.
  Stmt *Safelen = nullptr;

  /// Set safelen.
  void setSafelen(Expr *Len) { Safelen = Len; }

public:
  /// Build 'safelen' clause.
  ///
  /// \param Len Expression associated with this clause.
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPSafelenClause(Expr *Len, SourceLocation StartLoc, SourceLocation LParenLoc,
                   SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_safelen, StartLoc, EndLoc),
        LParenLoc(LParenLoc), Safelen(Len) {}

  /// Build an empty clause.
  explicit OMPSafelenClause()
      : OMPClause(llvm::omp::OMPC_safelen, SourceLocation(), SourceLocation()) {
  }

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Return safe iteration space distance.
  Expr *getSafelen() const { return cast_or_null<Expr>(Safelen); }

  child_range children() { return child_range(&Safelen, &Safelen + 1); }

  const_child_range children() const {
    return const_child_range(&Safelen, &Safelen + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_safelen;
  }
};

/// This represents 'simdlen' clause in the '#pragma omp ...'
/// directive.
///
/// \code
/// #pragma omp simd simdlen(4)
/// \endcode
/// In this example directive '#pragma omp simd' has clause 'simdlen'
/// with single expression '4'.
/// If the 'simdlen' clause is used then it specifies the preferred number of
/// iterations to be executed concurrently. The parameter of the 'simdlen'
/// clause must be a constant positive integer expression.
class OMPSimdlenClause : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Safe iteration space distance.
  Stmt *Simdlen = nullptr;

  /// Set simdlen.
  void setSimdlen(Expr *Len) { Simdlen = Len; }

public:
  /// Build 'simdlen' clause.
  ///
  /// \param Len Expression associated with this clause.
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPSimdlenClause(Expr *Len, SourceLocation StartLoc, SourceLocation LParenLoc,
                   SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_simdlen, StartLoc, EndLoc),
        LParenLoc(LParenLoc), Simdlen(Len) {}

  /// Build an empty clause.
  explicit OMPSimdlenClause()
      : OMPClause(llvm::omp::OMPC_simdlen, SourceLocation(), SourceLocation()) {
  }

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Return safe iteration space distance.
  Expr *getSimdlen() const { return cast_or_null<Expr>(Simdlen); }

  child_range children() { return child_range(&Simdlen, &Simdlen + 1); }

  const_child_range children() const {
    return const_child_range(&Simdlen, &Simdlen + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_simdlen;
  }
};

/// This represents the 'sizes' clause in the '#pragma omp tile' directive.
///
/// \code
/// #pragma omp tile sizes(5,5)
/// for (int i = 0; i < 64; ++i)
///   for (int j = 0; j < 64; ++j)
/// \endcode
class OMPSizesClause final
    : public OMPClause,
      private llvm::TrailingObjects<OMPSizesClause, Expr *> {
  friend class OMPClauseReader;
  friend class llvm::TrailingObjects<OMPSizesClause, Expr *>;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Number of tile sizes in the clause.
  unsigned NumSizes;

  /// Build an empty clause.
  explicit OMPSizesClause(int NumSizes)
      : OMPClause(llvm::omp::OMPC_sizes, SourceLocation(), SourceLocation()),
        NumSizes(NumSizes) {}

public:
  /// Build a 'sizes' AST node.
  ///
  /// \param C         Context of the AST.
  /// \param StartLoc  Location of the 'sizes' identifier.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc    Location of ')'.
  /// \param Sizes     Content of the clause.
  static OMPSizesClause *Create(const ASTContext &C, SourceLocation StartLoc,
                                SourceLocation LParenLoc, SourceLocation EndLoc,
                                ArrayRef<Expr *> Sizes);

  /// Build an empty 'sizes' AST node for deserialization.
  ///
  /// \param C     Context of the AST.
  /// \param NumSizes Number of items in the clause.
  static OMPSizesClause *CreateEmpty(const ASTContext &C, unsigned NumSizes);

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns the number of list items.
  unsigned getNumSizes() const { return NumSizes; }

  /// Returns the tile size expressions.
  MutableArrayRef<Expr *> getSizesRefs() {
    return MutableArrayRef<Expr *>(static_cast<OMPSizesClause *>(this)
                                       ->template getTrailingObjects<Expr *>(),
                                   NumSizes);
  }
  ArrayRef<Expr *> getSizesRefs() const {
    return ArrayRef<Expr *>(static_cast<const OMPSizesClause *>(this)
                                ->template getTrailingObjects<Expr *>(),
                            NumSizes);
  }

  /// Sets the tile size expressions.
  void setSizesRefs(ArrayRef<Expr *> VL) {
    assert(VL.size() == NumSizes);
    std::copy(VL.begin(), VL.end(),
              static_cast<OMPSizesClause *>(this)
                  ->template getTrailingObjects<Expr *>());
  }

  child_range children() {
    MutableArrayRef<Expr *> Sizes = getSizesRefs();
    return child_range(reinterpret_cast<Stmt **>(Sizes.begin()),
                       reinterpret_cast<Stmt **>(Sizes.end()));
  }
  const_child_range children() const {
    ArrayRef<Expr *> Sizes = getSizesRefs();
    return const_child_range(reinterpret_cast<Stmt *const *>(Sizes.begin()),
                             reinterpret_cast<Stmt *const *>(Sizes.end()));
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_sizes;
  }
};

/// Representation of the 'full' clause of the '#pragma omp unroll' directive.
///
/// \code
/// #pragma omp unroll full
/// for (int i = 0; i < 64; ++i)
/// \endcode
class OMPFullClause final : public OMPClause {
  friend class OMPClauseReader;

  /// Build an empty clause.
  explicit OMPFullClause() : OMPClause(llvm::omp::OMPC_full, {}, {}) {}

public:
  /// Build an AST node for a 'full' clause.
  ///
  /// \param C        Context of the AST.
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc   Ending location of the clause.
  static OMPFullClause *Create(const ASTContext &C, SourceLocation StartLoc,
                               SourceLocation EndLoc);

  /// Build an empty 'full' AST node for deserialization.
  ///
  /// \param C Context of the AST.
  static OMPFullClause *CreateEmpty(const ASTContext &C);

  child_range children() { return {child_iterator(), child_iterator()}; }
  const_child_range children() const {
    return {const_child_iterator(), const_child_iterator()};
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_full;
  }
};

/// Representation of the 'partial' clause of the '#pragma omp unroll'
/// directive.
///
/// \code
/// #pragma omp unroll partial(4)
/// for (int i = start; i < end; ++i)
/// \endcode
class OMPPartialClause final : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Optional argument to the clause (unroll factor).
  Stmt *Factor;

  /// Build an empty clause.
  explicit OMPPartialClause() : OMPClause(llvm::omp::OMPC_partial, {}, {}) {}

  /// Set the unroll factor.
  void setFactor(Expr *E) { Factor = E; }

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

public:
  /// Build an AST node for a 'partial' clause.
  ///
  /// \param C         Context of the AST.
  /// \param StartLoc  Location of the 'partial' identifier.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc    Location of ')'.
  /// \param Factor    Clause argument.
  static OMPPartialClause *Create(const ASTContext &C, SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc, Expr *Factor);

  /// Build an empty 'partial' AST node for deserialization.
  ///
  /// \param C     Context of the AST.
  static OMPPartialClause *CreateEmpty(const ASTContext &C);

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns the argument of the clause or nullptr if not set.
  Expr *getFactor() const { return cast_or_null<Expr>(Factor); }

  child_range children() { return child_range(&Factor, &Factor + 1); }
  const_child_range children() const {
    return const_child_range(&Factor, &Factor + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_partial;
  }
};

/// This represents 'collapse' clause in the '#pragma omp ...'
/// directive.
///
/// \code
/// #pragma omp simd collapse(3)
/// \endcode
/// In this example directive '#pragma omp simd' has clause 'collapse'
/// with single expression '3'.
/// The parameter must be a constant positive integer expression, it specifies
/// the number of nested loops that should be collapsed into a single iteration
/// space.
class OMPCollapseClause : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Number of for-loops.
  Stmt *NumForLoops = nullptr;

  /// Set the number of associated for-loops.
  void setNumForLoops(Expr *Num) { NumForLoops = Num; }

public:
  /// Build 'collapse' clause.
  ///
  /// \param Num Expression associated with this clause.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPCollapseClause(Expr *Num, SourceLocation StartLoc,
                    SourceLocation LParenLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_collapse, StartLoc, EndLoc),
        LParenLoc(LParenLoc), NumForLoops(Num) {}

  /// Build an empty clause.
  explicit OMPCollapseClause()
      : OMPClause(llvm::omp::OMPC_collapse, SourceLocation(),
                  SourceLocation()) {}

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Return the number of associated for-loops.
  Expr *getNumForLoops() const { return cast_or_null<Expr>(NumForLoops); }

  child_range children() { return child_range(&NumForLoops, &NumForLoops + 1); }

  const_child_range children() const {
    return const_child_range(&NumForLoops, &NumForLoops + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_collapse;
  }
};

/// This represents 'default' clause in the '#pragma omp ...' directive.
///
/// \code
/// #pragma omp parallel default(shared)
/// \endcode
/// In this example directive '#pragma omp parallel' has simple 'default'
/// clause with kind 'shared'.
class OMPDefaultClause : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// A kind of the 'default' clause.
  llvm::omp::DefaultKind Kind = llvm::omp::OMP_DEFAULT_unknown;

  /// Start location of the kind in source code.
  SourceLocation KindKwLoc;

  /// Set kind of the clauses.
  ///
  /// \param K Argument of clause.
  void setDefaultKind(llvm::omp::DefaultKind K) { Kind = K; }

  /// Set argument location.
  ///
  /// \param KLoc Argument location.
  void setDefaultKindKwLoc(SourceLocation KLoc) { KindKwLoc = KLoc; }

public:
  /// Build 'default' clause with argument \a A ('none' or 'shared').
  ///
  /// \param A Argument of the clause ('none' or 'shared').
  /// \param ALoc Starting location of the argument.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPDefaultClause(llvm::omp::DefaultKind A, SourceLocation ALoc,
                   SourceLocation StartLoc, SourceLocation LParenLoc,
                   SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_default, StartLoc, EndLoc),
        LParenLoc(LParenLoc), Kind(A), KindKwLoc(ALoc) {}

  /// Build an empty clause.
  OMPDefaultClause()
      : OMPClause(llvm::omp::OMPC_default, SourceLocation(), SourceLocation()) {
  }

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns kind of the clause.
  llvm::omp::DefaultKind getDefaultKind() const { return Kind; }

  /// Returns location of clause kind.
  SourceLocation getDefaultKindKwLoc() const { return KindKwLoc; }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_default;
  }
};

/// This represents 'proc_bind' clause in the '#pragma omp ...'
/// directive.
///
/// \code
/// #pragma omp parallel proc_bind(master)
/// \endcode
/// In this example directive '#pragma omp parallel' has simple 'proc_bind'
/// clause with kind 'master'.
class OMPProcBindClause : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// A kind of the 'proc_bind' clause.
  llvm::omp::ProcBindKind Kind = llvm::omp::OMP_PROC_BIND_unknown;

  /// Start location of the kind in source code.
  SourceLocation KindKwLoc;

  /// Set kind of the clause.
  ///
  /// \param K Kind of clause.
  void setProcBindKind(llvm::omp::ProcBindKind K) { Kind = K; }

  /// Set clause kind location.
  ///
  /// \param KLoc Kind location.
  void setProcBindKindKwLoc(SourceLocation KLoc) { KindKwLoc = KLoc; }

public:
  /// Build 'proc_bind' clause with argument \a A ('master', 'close' or
  ///        'spread').
  ///
  /// \param A Argument of the clause ('master', 'close' or 'spread').
  /// \param ALoc Starting location of the argument.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPProcBindClause(llvm::omp::ProcBindKind A, SourceLocation ALoc,
                    SourceLocation StartLoc, SourceLocation LParenLoc,
                    SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_proc_bind, StartLoc, EndLoc),
        LParenLoc(LParenLoc), Kind(A), KindKwLoc(ALoc) {}

  /// Build an empty clause.
  OMPProcBindClause()
      : OMPClause(llvm::omp::OMPC_proc_bind, SourceLocation(),
                  SourceLocation()) {}

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns kind of the clause.
  llvm::omp::ProcBindKind getProcBindKind() const { return Kind; }

  /// Returns location of clause kind.
  SourceLocation getProcBindKindKwLoc() const { return KindKwLoc; }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_proc_bind;
  }
};

/// This represents 'unified_address' clause in the '#pragma omp requires'
/// directive.
///
/// \code
/// #pragma omp requires unified_address
/// \endcode
/// In this example directive '#pragma omp requires' has 'unified_address'
/// clause.
class OMPUnifiedAddressClause final : public OMPClause {
public:
  friend class OMPClauseReader;
  /// Build 'unified_address' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPUnifiedAddressClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_unified_address, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPUnifiedAddressClause()
      : OMPClause(llvm::omp::OMPC_unified_address, SourceLocation(),
                  SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_unified_address;
  }
};

/// This represents 'unified_shared_memory' clause in the '#pragma omp requires'
/// directive.
///
/// \code
/// #pragma omp requires unified_shared_memory
/// \endcode
/// In this example directive '#pragma omp requires' has 'unified_shared_memory'
/// clause.
class OMPUnifiedSharedMemoryClause final : public OMPClause {
public:
  friend class OMPClauseReader;
  /// Build 'unified_shared_memory' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPUnifiedSharedMemoryClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_unified_shared_memory, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPUnifiedSharedMemoryClause()
      : OMPClause(llvm::omp::OMPC_unified_shared_memory, SourceLocation(),
                  SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_unified_shared_memory;
  }
};

/// This represents 'reverse_offload' clause in the '#pragma omp requires'
/// directive.
///
/// \code
/// #pragma omp requires reverse_offload
/// \endcode
/// In this example directive '#pragma omp requires' has 'reverse_offload'
/// clause.
class OMPReverseOffloadClause final : public OMPClause {
public:
  friend class OMPClauseReader;
  /// Build 'reverse_offload' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPReverseOffloadClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_reverse_offload, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPReverseOffloadClause()
      : OMPClause(llvm::omp::OMPC_reverse_offload, SourceLocation(),
                  SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_reverse_offload;
  }
};

/// This represents 'dynamic_allocators' clause in the '#pragma omp requires'
/// directive.
///
/// \code
/// #pragma omp requires dynamic_allocators
/// \endcode
/// In this example directive '#pragma omp requires' has 'dynamic_allocators'
/// clause.
class OMPDynamicAllocatorsClause final : public OMPClause {
public:
  friend class OMPClauseReader;
  /// Build 'dynamic_allocators' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPDynamicAllocatorsClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_dynamic_allocators, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPDynamicAllocatorsClause()
      : OMPClause(llvm::omp::OMPC_dynamic_allocators, SourceLocation(),
                  SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_dynamic_allocators;
  }
};

/// This represents 'atomic_default_mem_order' clause in the '#pragma omp
/// requires'  directive.
///
/// \code
/// #pragma omp requires atomic_default_mem_order(seq_cst)
/// \endcode
/// In this example directive '#pragma omp requires' has simple
/// atomic_default_mem_order' clause with kind 'seq_cst'.
class OMPAtomicDefaultMemOrderClause final : public OMPClause {
  friend class OMPClauseReader;

  /// Location of '('
  SourceLocation LParenLoc;

  /// A kind of the 'atomic_default_mem_order' clause.
  OpenMPAtomicDefaultMemOrderClauseKind Kind =
      OMPC_ATOMIC_DEFAULT_MEM_ORDER_unknown;

  /// Start location of the kind in source code.
  SourceLocation KindKwLoc;

  /// Set kind of the clause.
  ///
  /// \param K Kind of clause.
  void setAtomicDefaultMemOrderKind(OpenMPAtomicDefaultMemOrderClauseKind K) {
    Kind = K;
  }

  /// Set clause kind location.
  ///
  /// \param KLoc Kind location.
  void setAtomicDefaultMemOrderKindKwLoc(SourceLocation KLoc) {
    KindKwLoc = KLoc;
  }

public:
  /// Build 'atomic_default_mem_order' clause with argument \a A ('seq_cst',
  /// 'acq_rel' or 'relaxed').
  ///
  /// \param A Argument of the clause ('seq_cst', 'acq_rel' or 'relaxed').
  /// \param ALoc Starting location of the argument.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPAtomicDefaultMemOrderClause(OpenMPAtomicDefaultMemOrderClauseKind A,
                                 SourceLocation ALoc, SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_atomic_default_mem_order, StartLoc, EndLoc),
        LParenLoc(LParenLoc), Kind(A), KindKwLoc(ALoc) {}

  /// Build an empty clause.
  OMPAtomicDefaultMemOrderClause()
      : OMPClause(llvm::omp::OMPC_atomic_default_mem_order, SourceLocation(),
                  SourceLocation()) {}

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the locaiton of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Returns kind of the clause.
  OpenMPAtomicDefaultMemOrderClauseKind getAtomicDefaultMemOrderKind() const {
    return Kind;
  }

  /// Returns location of clause kind.
  SourceLocation getAtomicDefaultMemOrderKindKwLoc() const { return KindKwLoc; }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_atomic_default_mem_order;
  }
};

/// This represents 'schedule' clause in the '#pragma omp ...' directive.
///
/// \code
/// #pragma omp for schedule(static, 3)
/// \endcode
/// In this example directive '#pragma omp for' has 'schedule' clause with
/// arguments 'static' and '3'.
class OMPScheduleClause : public OMPClause, public OMPClauseWithPreInit {
  friend class OMPClauseReader;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// A kind of the 'schedule' clause.
  OpenMPScheduleClauseKind Kind = OMPC_SCHEDULE_unknown;

  /// Modifiers for 'schedule' clause.
  enum {FIRST, SECOND, NUM_MODIFIERS};
  OpenMPScheduleClauseModifier Modifiers[NUM_MODIFIERS];

  /// Locations of modifiers.
  SourceLocation ModifiersLoc[NUM_MODIFIERS];

  /// Start location of the schedule ind in source code.
  SourceLocation KindLoc;

  /// Location of ',' (if any).
  SourceLocation CommaLoc;

  /// Chunk size.
  Expr *ChunkSize = nullptr;

  /// Set schedule kind.
  ///
  /// \param K Schedule kind.
  void setScheduleKind(OpenMPScheduleClauseKind K) { Kind = K; }

  /// Set the first schedule modifier.
  ///
  /// \param M Schedule modifier.
  void setFirstScheduleModifier(OpenMPScheduleClauseModifier M) {
    Modifiers[FIRST] = M;
  }

  /// Set the second schedule modifier.
  ///
  /// \param M Schedule modifier.
  void setSecondScheduleModifier(OpenMPScheduleClauseModifier M) {
    Modifiers[SECOND] = M;
  }

  /// Set location of the first schedule modifier.
  void setFirstScheduleModifierLoc(SourceLocation Loc) {
    ModifiersLoc[FIRST] = Loc;
  }

  /// Set location of the second schedule modifier.
  void setSecondScheduleModifierLoc(SourceLocation Loc) {
    ModifiersLoc[SECOND] = Loc;
  }

  /// Set schedule modifier location.
  ///
  /// \param M Schedule modifier location.
  void setScheduleModifer(OpenMPScheduleClauseModifier M) {
    if (Modifiers[FIRST] == OMPC_SCHEDULE_MODIFIER_unknown)
      Modifiers[FIRST] = M;
    else {
      assert(Modifiers[SECOND] == OMPC_SCHEDULE_MODIFIER_unknown);
      Modifiers[SECOND] = M;
    }
  }

  /// Sets the location of '('.
  ///
  /// \param Loc Location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Set schedule kind start location.
  ///
  /// \param KLoc Schedule kind location.
  void setScheduleKindLoc(SourceLocation KLoc) { KindLoc = KLoc; }

  /// Set location of ','.
  ///
  /// \param Loc Location of ','.
  void setCommaLoc(SourceLocation Loc) { CommaLoc = Loc; }

  /// Set chunk size.
  ///
  /// \param E Chunk size.
  void setChunkSize(Expr *E) { ChunkSize = E; }

public:
  /// Build 'schedule' clause with schedule kind \a Kind and chunk size
  /// expression \a ChunkSize.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param KLoc Starting location of the argument.
  /// \param CommaLoc Location of ','.
  /// \param EndLoc Ending location of the clause.
  /// \param Kind Schedule kind.
  /// \param ChunkSize Chunk size.
  /// \param HelperChunkSize Helper chunk size for combined directives.
  /// \param M1 The first modifier applied to 'schedule' clause.
  /// \param M1Loc Location of the first modifier
  /// \param M2 The second modifier applied to 'schedule' clause.
  /// \param M2Loc Location of the second modifier
  OMPScheduleClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                    SourceLocation KLoc, SourceLocation CommaLoc,
                    SourceLocation EndLoc, OpenMPScheduleClauseKind Kind,
                    Expr *ChunkSize, Stmt *HelperChunkSize,
                    OpenMPScheduleClauseModifier M1, SourceLocation M1Loc,
                    OpenMPScheduleClauseModifier M2, SourceLocation M2Loc)
      : OMPClause(llvm::omp::OMPC_schedule, StartLoc, EndLoc),
        OMPClauseWithPreInit(this), LParenLoc(LParenLoc), Kind(Kind),
        KindLoc(KLoc), CommaLoc(CommaLoc), ChunkSize(ChunkSize) {
    setPreInitStmt(HelperChunkSize);
    Modifiers[FIRST] = M1;
    Modifiers[SECOND] = M2;
    ModifiersLoc[FIRST] = M1Loc;
    ModifiersLoc[SECOND] = M2Loc;
  }

  /// Build an empty clause.
  explicit OMPScheduleClause()
      : OMPClause(llvm::omp::OMPC_schedule, SourceLocation(), SourceLocation()),
        OMPClauseWithPreInit(this) {
    Modifiers[FIRST] = OMPC_SCHEDULE_MODIFIER_unknown;
    Modifiers[SECOND] = OMPC_SCHEDULE_MODIFIER_unknown;
  }

  /// Get kind of the clause.
  OpenMPScheduleClauseKind getScheduleKind() const { return Kind; }

  /// Get the first modifier of the clause.
  OpenMPScheduleClauseModifier getFirstScheduleModifier() const {
    return Modifiers[FIRST];
  }

  /// Get the second modifier of the clause.
  OpenMPScheduleClauseModifier getSecondScheduleModifier() const {
    return Modifiers[SECOND];
  }

  /// Get location of '('.
  SourceLocation getLParenLoc() { return LParenLoc; }

  /// Get kind location.
  SourceLocation getScheduleKindLoc() { return KindLoc; }

  /// Get the first modifier location.
  SourceLocation getFirstScheduleModifierLoc() const {
    return ModifiersLoc[FIRST];
  }

  /// Get the second modifier location.
  SourceLocation getSecondScheduleModifierLoc() const {
    return ModifiersLoc[SECOND];
  }

  /// Get location of ','.
  SourceLocation getCommaLoc() { return CommaLoc; }

  /// Get chunk size.
  Expr *getChunkSize() { return ChunkSize; }

  /// Get chunk size.
  const Expr *getChunkSize() const { return ChunkSize; }

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(&ChunkSize),
                       reinterpret_cast<Stmt **>(&ChunkSize) + 1);
  }

  const_child_range children() const {
    auto Children = const_cast<OMPScheduleClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_schedule;
  }
};

/// This represents 'ordered' clause in the '#pragma omp ...' directive.
///
/// \code
/// #pragma omp for ordered (2)
/// \endcode
/// In this example directive '#pragma omp for' has 'ordered' clause with
/// parameter 2.
class OMPOrderedClause final
    : public OMPClause,
      private llvm::TrailingObjects<OMPOrderedClause, Expr *> {
  friend class OMPClauseReader;
  friend TrailingObjects;

  /// Location of '('.
  SourceLocation LParenLoc;

  /// Number of for-loops.
  Stmt *NumForLoops = nullptr;

  /// Real number of loops.
  unsigned NumberOfLoops = 0;

  /// Build 'ordered' clause.
  ///
  /// \param Num Expression, possibly associated with this clause.
  /// \param NumLoops Number of loops, associated with this clause.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  OMPOrderedClause(Expr *Num, unsigned NumLoops, SourceLocation StartLoc,
                   SourceLocation LParenLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_ordered, StartLoc, EndLoc),
        LParenLoc(LParenLoc), NumForLoops(Num), NumberOfLoops(NumLoops) {}

  /// Build an empty clause.
  explicit OMPOrderedClause(unsigned NumLoops)
      : OMPClause(llvm::omp::OMPC_ordered, SourceLocation(), SourceLocation()),
        NumberOfLoops(NumLoops) {}

  /// Set the number of associated for-loops.
  void setNumForLoops(Expr *Num) { NumForLoops = Num; }

public:
  /// Build 'ordered' clause.
  ///
  /// \param Num Expression, possibly associated with this clause.
  /// \param NumLoops Number of loops, associated with this clause.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  static OMPOrderedClause *Create(const ASTContext &C, Expr *Num,
                                  unsigned NumLoops, SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc);

  /// Build an empty clause.
  static OMPOrderedClause* CreateEmpty(const ASTContext &C, unsigned NumLoops);

  /// Sets the location of '('.
  void setLParenLoc(SourceLocation Loc) { LParenLoc = Loc; }

  /// Returns the location of '('.
  SourceLocation getLParenLoc() const { return LParenLoc; }

  /// Return the number of associated for-loops.
  Expr *getNumForLoops() const { return cast_or_null<Expr>(NumForLoops); }

  /// Set number of iterations for the specified loop.
  void setLoopNumIterations(unsigned NumLoop, Expr *NumIterations);
  /// Get number of iterations for all the loops.
  ArrayRef<Expr *> getLoopNumIterations() const;

  /// Set loop counter for the specified loop.
  void setLoopCounter(unsigned NumLoop, Expr *Counter);
  /// Get loops counter for the specified loop.
  Expr *getLoopCounter(unsigned NumLoop);
  const Expr *getLoopCounter(unsigned NumLoop) const;

  child_range children() { return child_range(&NumForLoops, &NumForLoops + 1); }

  const_child_range children() const {
    return const_child_range(&NumForLoops, &NumForLoops + 1);
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_ordered;
  }
};

/// This represents 'nowait' clause in the '#pragma omp ...' directive.
///
/// \code
/// #pragma omp for nowait
/// \endcode
/// In this example directive '#pragma omp for' has 'nowait' clause.
class OMPNowaitClause : public OMPClause {
public:
  /// Build 'nowait' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPNowaitClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_nowait, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPNowaitClause()
      : OMPClause(llvm::omp::OMPC_nowait, SourceLocation(), SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_nowait;
  }
};

/// This represents 'untied' clause in the '#pragma omp ...' directive.
///
/// \code
/// #pragma omp task untied
/// \endcode
/// In this example directive '#pragma omp task' has 'untied' clause.
class OMPUntiedClause : public OMPClause {
public:
  /// Build 'untied' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPUntiedClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_untied, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPUntiedClause()
      : OMPClause(llvm::omp::OMPC_untied, SourceLocation(), SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_untied;
  }
};

/// This represents 'mergeable' clause in the '#pragma omp ...'
/// directive.
///
/// \code
/// #pragma omp task mergeable
/// \endcode
/// In this example directive '#pragma omp task' has 'mergeable' clause.
class OMPMergeableClause : public OMPClause {
public:
  /// Build 'mergeable' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPMergeableClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_mergeable, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPMergeableClause()
      : OMPClause(llvm::omp::OMPC_mergeable, SourceLocation(),
                  SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_mergeable;
  }
};

/// This represents 'read' clause in the '#pragma omp atomic' directive.
///
/// \code
/// #pragma omp atomic read
/// \endcode
/// In this example directive '#pragma omp atomic' has 'read' clause.
class OMPReadClause : public OMPClause {
public:
  /// Build 'read' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPReadClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_read, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPReadClause()
      : OMPClause(llvm::omp::OMPC_read, SourceLocation(), SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_read;
  }
};

/// This represents 'write' clause in the '#pragma omp atomic' directive.
///
/// \code
/// #pragma omp atomic write
/// \endcode
/// In this example directive '#pragma omp atomic' has 'write' clause.
class OMPWriteClause : public OMPClause {
public:
  /// Build 'write' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPWriteClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_write, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPWriteClause()
      : OMPClause(llvm::omp::OMPC_write, SourceLocation(), SourceLocation()) {}

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_write;
  }
};

/// This represents 'update' clause in the '#pragma omp atomic'
/// directive.
///
/// \code
/// #pragma omp atomic update
/// \endcode
/// In this example directive '#pragma omp atomic' has 'update' clause.
/// Also, this class represents 'update' clause in  '#pragma omp depobj'
/// directive.
///
/// \code
/// #pragma omp depobj(a) update(in)
/// \endcode
/// In this example directive '#pragma omp depobj' has 'update' clause with 'in'
/// dependence kind.
class OMPUpdateClause final
    : public OMPClause,
      private llvm::TrailingObjects<OMPUpdateClause, SourceLocation,
                                    OpenMPDependClauseKind> {
  friend class OMPClauseReader;
  friend TrailingObjects;

  /// true if extended version of the clause for 'depobj' directive.
  bool IsExtended = false;

  /// Define the sizes of each trailing object array except the last one. This
  /// is required for TrailingObjects to work properly.
  size_t numTrailingObjects(OverloadToken<SourceLocation>) const {
    // 2 locations: for '(' and argument location.
    return IsExtended ? 2 : 00;
  }

  /// Sets the location of '(' in clause for 'depobj' directive.
  void setLParenLoc(SourceLocation Loc) {
    assert(IsExtended && "Expected extended clause.");
    *getTrailingObjects<SourceLocation>() = Loc;
  }

  /// Sets the location of '(' in clause for 'depobj' directive.
  void setArgumentLoc(SourceLocation Loc) {
    assert(IsExtended && "Expected extended clause.");
    *std::next(getTrailingObjects<SourceLocation>(), 1) = Loc;
  }

  /// Sets the dependence kind for the clause for 'depobj' directive.
  void setDependencyKind(OpenMPDependClauseKind DK) {
    assert(IsExtended && "Expected extended clause.");
    *getTrailingObjects<OpenMPDependClauseKind>() = DK;
  }

  /// Build 'update' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPUpdateClause(SourceLocation StartLoc, SourceLocation EndLoc,
                  bool IsExtended)
      : OMPClause(llvm::omp::OMPC_update, StartLoc, EndLoc),
        IsExtended(IsExtended) {}

  /// Build an empty clause.
  OMPUpdateClause(bool IsExtended)
      : OMPClause(llvm::omp::OMPC_update, SourceLocation(), SourceLocation()),
        IsExtended(IsExtended) {}

public:
  /// Creates clause for 'atomic' directive.
  ///
  /// \param C AST context.
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  static OMPUpdateClause *Create(const ASTContext &C, SourceLocation StartLoc,
                                 SourceLocation EndLoc);

  /// Creates clause for 'depobj' directive.
  ///
  /// \param C AST context.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param ArgumentLoc Location of the argument.
  /// \param DK Dependence kind.
  /// \param EndLoc Ending location of the clause.
  static OMPUpdateClause *Create(const ASTContext &C, SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation ArgumentLoc,
                                 OpenMPDependClauseKind DK,
                                 SourceLocation EndLoc);

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param IsExtended true if extended clause for 'depobj' directive must be
  /// created.
  static OMPUpdateClause *CreateEmpty(const ASTContext &C, bool IsExtended);

  /// Checks if the clause is the extended clauses for 'depobj' directive.
  bool isExtended() const { return IsExtended; }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  /// Gets the location of '(' in clause for 'depobj' directive.
  SourceLocation getLParenLoc() const {
    assert(IsExtended && "Expected extended clause.");
    return *getTrailingObjects<SourceLocation>();
  }

  /// Gets the location of argument in clause for 'depobj' directive.
  SourceLocation getArgumentLoc() const {
    assert(IsExtended && "Expected extended clause.");
    return *std::next(getTrailingObjects<SourceLocation>(), 1);
  }

  /// Gets the dependence kind in clause for 'depobj' directive.
  OpenMPDependClauseKind getDependencyKind() const {
    assert(IsExtended && "Expected extended clause.");
    return *getTrailingObjects<OpenMPDependClauseKind>();
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_update;
  }
};

/// This represents 'capture' clause in the '#pragma omp atomic'
/// directive.
///
/// \code
/// #pragma omp atomic capture
/// \endcode
/// In this example directive '#pragma omp atomic' has 'capture' clause.
class OMPCaptureClause : public OMPClause {
public:
  /// Build 'capture' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPCaptureClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_capture, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPCaptureClause()
      : OMPClause(llvm::omp::OMPC_capture, SourceLocation(), SourceLocation()) {
  }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_capture;
  }
};

/// This represents 'compare' clause in the '#pragma omp atomic'
/// directive.
///
/// \code
/// #pragma omp atomic compare
/// \endcode
/// In this example directive '#pragma omp atomic' has 'compare' clause.
class OMPCompareClause final : public OMPClause {
public:
  /// Build 'compare' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPCompareClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_compare, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPCompareClause()
      : OMPClause(llvm::omp::OMPC_compare, SourceLocation(), SourceLocation()) {
  }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_compare;
  }
};

/// This represents 'seq_cst' clause in the '#pragma omp atomic'
/// directive.
///
/// \code
/// #pragma omp atomic seq_cst
/// \endcode
/// In this example directive '#pragma omp atomic' has 'seq_cst' clause.
class OMPSeqCstClause : public OMPClause {
public:
  /// Build 'seq_cst' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPSeqCstClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_seq_cst, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPSeqCstClause()
      : OMPClause(llvm::omp::OMPC_seq_cst, SourceLocation(), SourceLocation()) {
  }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_seq_cst;
  }
};

/// This represents 'acq_rel' clause in the '#pragma omp atomic|flush'
/// directives.
///
/// \code
/// #pragma omp flush acq_rel
/// \endcode
/// In this example directive '#pragma omp flush' has 'acq_rel' clause.
class OMPAcqRelClause final : public OMPClause {
public:
  /// Build 'ack_rel' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPAcqRelClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_acq_rel, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPAcqRelClause()
      : OMPClause(llvm::omp::OMPC_acq_rel, SourceLocation(), SourceLocation()) {
  }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_acq_rel;
  }
};

/// This represents 'acquire' clause in the '#pragma omp atomic|flush'
/// directives.
///
/// \code
/// #pragma omp flush acquire
/// \endcode
/// In this example directive '#pragma omp flush' has 'acquire' clause.
class OMPAcquireClause final : public OMPClause {
public:
  /// Build 'acquire' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPAcquireClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_acquire, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPAcquireClause()
      : OMPClause(llvm::omp::OMPC_acquire, SourceLocation(), SourceLocation()) {
  }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_acquire;
  }
};

/// This represents 'release' clause in the '#pragma omp atomic|flush'
/// directives.
///
/// \code
/// #pragma omp flush release
/// \endcode
/// In this example directive '#pragma omp flush' has 'release' clause.
class OMPReleaseClause final : public OMPClause {
public:
  /// Build 'release' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPReleaseClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_release, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPReleaseClause()
      : OMPClause(llvm::omp::OMPC_release, SourceLocation(), SourceLocation()) {
  }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_release;
  }
};

/// This represents 'relaxed' clause in the '#pragma omp atomic'
/// directives.
///
/// \code
/// #pragma omp atomic relaxed
/// \endcode
/// In this example directive '#pragma omp atomic' has 'relaxed' clause.
class OMPRelaxedClause final : public OMPClause {
public:
  /// Build 'relaxed' clause.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param EndLoc Ending location of the clause.
  OMPRelaxedClause(SourceLocation StartLoc, SourceLocation EndLoc)
      : OMPClause(llvm::omp::OMPC_relaxed, StartLoc, EndLoc) {}

  /// Build an empty clause.
  OMPRelaxedClause()
      : OMPClause(llvm::omp::OMPC_relaxed, SourceLocation(), SourceLocation()) {
  }

  child_range children() {
    return child_range(child_iterator(), child_iterator());
  }

  const_child_range children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_relaxed;
  }
};

/// This represents clause 'private' in the '#pragma omp ...' directives.
///
/// \code
/// #pragma omp parallel private(a,b)
/// \endcode
/// In this example directive '#pragma omp parallel' has clause 'private'
/// with the variables 'a' and 'b'.
class OMPPrivateClause final
    : public OMPVarListClause<OMPPrivateClause>,
      private llvm::TrailingObjects<OMPPrivateClause, Expr *> {
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param N Number of the variables in the clause.
  OMPPrivateClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                   SourceLocation EndLoc, unsigned N)
      : OMPVarListClause<OMPPrivateClause>(llvm::omp::OMPC_private, StartLoc,
                                           LParenLoc, EndLoc, N) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPPrivateClause(unsigned N)
      : OMPVarListClause<OMPPrivateClause>(llvm::omp::OMPC_private,
                                           SourceLocation(), SourceLocation(),
                                           SourceLocation(), N) {}

  /// Sets the list of references to private copies with initializers for
  /// new private variables.
  /// \param VL List of references.
  void setPrivateCopies(ArrayRef<Expr *> VL);

  /// Gets the list of references to private copies with initializers for
  /// new private variables.
  MutableArrayRef<Expr *> getPrivateCopies() {
    return MutableArrayRef<Expr *>(varlist_end(), varlist_size());
  }
  ArrayRef<const Expr *> getPrivateCopies() const {
    return llvm::makeArrayRef(varlist_end(), varlist_size());
  }

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param C AST context.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param VL List of references to the variables.
  /// \param PrivateVL List of references to private copies with initializers.
  static OMPPrivateClause *Create(const ASTContext &C, SourceLocation StartLoc,
                                  SourceLocation LParenLoc,
                                  SourceLocation EndLoc, ArrayRef<Expr *> VL,
                                  ArrayRef<Expr *> PrivateVL);

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  static OMPPrivateClause *CreateEmpty(const ASTContext &C, unsigned N);

  using private_copies_iterator = MutableArrayRef<Expr *>::iterator;
  using private_copies_const_iterator = ArrayRef<const Expr *>::iterator;
  using private_copies_range = llvm::iterator_range<private_copies_iterator>;
  using private_copies_const_range =
      llvm::iterator_range<private_copies_const_iterator>;

  private_copies_range private_copies() {
    return private_copies_range(getPrivateCopies().begin(),
                                getPrivateCopies().end());
  }

  private_copies_const_range private_copies() const {
    return private_copies_const_range(getPrivateCopies().begin(),
                                      getPrivateCopies().end());
  }

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPPrivateClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_private;
  }
};

/// This represents clause 'firstprivate' in the '#pragma omp ...'
/// directives.
///
/// \code
/// #pragma omp parallel firstprivate(a,b)
/// \endcode
/// In this example directive '#pragma omp parallel' has clause 'firstprivate'
/// with the variables 'a' and 'b'.
class OMPFirstprivateClause final
    : public OMPVarListClause<OMPFirstprivateClause>,
      public OMPClauseWithPreInit,
      private llvm::TrailingObjects<OMPFirstprivateClause, Expr *> {
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param N Number of the variables in the clause.
  OMPFirstprivateClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                        SourceLocation EndLoc, unsigned N)
      : OMPVarListClause<OMPFirstprivateClause>(llvm::omp::OMPC_firstprivate,
                                                StartLoc, LParenLoc, EndLoc, N),
        OMPClauseWithPreInit(this) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPFirstprivateClause(unsigned N)
      : OMPVarListClause<OMPFirstprivateClause>(
            llvm::omp::OMPC_firstprivate, SourceLocation(), SourceLocation(),
            SourceLocation(), N),
        OMPClauseWithPreInit(this) {}

  /// Sets the list of references to private copies with initializers for
  /// new private variables.
  /// \param VL List of references.
  void setPrivateCopies(ArrayRef<Expr *> VL);

  /// Gets the list of references to private copies with initializers for
  /// new private variables.
  MutableArrayRef<Expr *> getPrivateCopies() {
    return MutableArrayRef<Expr *>(varlist_end(), varlist_size());
  }
  ArrayRef<const Expr *> getPrivateCopies() const {
    return llvm::makeArrayRef(varlist_end(), varlist_size());
  }

  /// Sets the list of references to initializer variables for new
  /// private variables.
  /// \param VL List of references.
  void setInits(ArrayRef<Expr *> VL);

  /// Gets the list of references to initializer variables for new
  /// private variables.
  MutableArrayRef<Expr *> getInits() {
    return MutableArrayRef<Expr *>(getPrivateCopies().end(), varlist_size());
  }
  ArrayRef<const Expr *> getInits() const {
    return llvm::makeArrayRef(getPrivateCopies().end(), varlist_size());
  }

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param C AST context.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param VL List of references to the original variables.
  /// \param PrivateVL List of references to private copies with initializers.
  /// \param InitVL List of references to auto generated variables used for
  /// initialization of a single array element. Used if firstprivate variable is
  /// of array type.
  /// \param PreInit Statement that must be executed before entering the OpenMP
  /// region with this clause.
  static OMPFirstprivateClause *
  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc,
         SourceLocation EndLoc, ArrayRef<Expr *> VL, ArrayRef<Expr *> PrivateVL,
         ArrayRef<Expr *> InitVL, Stmt *PreInit);

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  static OMPFirstprivateClause *CreateEmpty(const ASTContext &C, unsigned N);

  using private_copies_iterator = MutableArrayRef<Expr *>::iterator;
  using private_copies_const_iterator = ArrayRef<const Expr *>::iterator;
  using private_copies_range = llvm::iterator_range<private_copies_iterator>;
  using private_copies_const_range =
      llvm::iterator_range<private_copies_const_iterator>;

  private_copies_range private_copies() {
    return private_copies_range(getPrivateCopies().begin(),
                                getPrivateCopies().end());
  }
  private_copies_const_range private_copies() const {
    return private_copies_const_range(getPrivateCopies().begin(),
                                      getPrivateCopies().end());
  }

  using inits_iterator = MutableArrayRef<Expr *>::iterator;
  using inits_const_iterator = ArrayRef<const Expr *>::iterator;
  using inits_range = llvm::iterator_range<inits_iterator>;
  using inits_const_range = llvm::iterator_range<inits_const_iterator>;

  inits_range inits() {
    return inits_range(getInits().begin(), getInits().end());
  }
  inits_const_range inits() const {
    return inits_const_range(getInits().begin(), getInits().end());
  }

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPFirstprivateClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }
  const_child_range used_children() const {
    auto Children = const_cast<OMPFirstprivateClause *>(this)->used_children();
    return const_child_range(Children.begin(), Children.end());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_firstprivate;
  }
};

/// This represents clause 'lastprivate' in the '#pragma omp ...'
/// directives.
///
/// \code
/// #pragma omp simd lastprivate(a,b)
/// \endcode
/// In this example directive '#pragma omp simd' has clause 'lastprivate'
/// with the variables 'a' and 'b'.
class OMPLastprivateClause final
    : public OMPVarListClause<OMPLastprivateClause>,
      public OMPClauseWithPostUpdate,
      private llvm::TrailingObjects<OMPLastprivateClause, Expr *> {
  // There are 4 additional tail-allocated arrays at the end of the class:
  // 1. Contains list of pseudo variables with the default initialization for
  // each non-firstprivate variables. Used in codegen for initialization of
  // lastprivate copies.
  // 2. List of helper expressions for proper generation of assignment operation
  // required for lastprivate clause. This list represents private variables
  // (for arrays, single array element).
  // 3. List of helper expressions for proper generation of assignment operation
  // required for lastprivate clause. This list represents original variables
  // (for arrays, single array element).
  // 4. List of helper expressions that represents assignment operation:
  // \code
  // DstExprs = SrcExprs;
  // \endcode
  // Required for proper codegen of final assignment performed by the
  // lastprivate clause.
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Optional lastprivate kind, e.g. 'conditional', if specified by user.
  OpenMPLastprivateModifier LPKind;
  /// Optional location of the lasptrivate kind, if specified by user.
  SourceLocation LPKindLoc;
  /// Optional colon location, if specified by user.
  SourceLocation ColonLoc;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param N Number of the variables in the clause.
  OMPLastprivateClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                       SourceLocation EndLoc, OpenMPLastprivateModifier LPKind,
                       SourceLocation LPKindLoc, SourceLocation ColonLoc,
                       unsigned N)
      : OMPVarListClause<OMPLastprivateClause>(llvm::omp::OMPC_lastprivate,
                                               StartLoc, LParenLoc, EndLoc, N),
        OMPClauseWithPostUpdate(this), LPKind(LPKind), LPKindLoc(LPKindLoc),
        ColonLoc(ColonLoc) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPLastprivateClause(unsigned N)
      : OMPVarListClause<OMPLastprivateClause>(
            llvm::omp::OMPC_lastprivate, SourceLocation(), SourceLocation(),
            SourceLocation(), N),
        OMPClauseWithPostUpdate(this) {}

  /// Get the list of helper expressions for initialization of private
  /// copies for lastprivate variables.
  MutableArrayRef<Expr *> getPrivateCopies() {
    return MutableArrayRef<Expr *>(varlist_end(), varlist_size());
  }
  ArrayRef<const Expr *> getPrivateCopies() const {
    return llvm::makeArrayRef(varlist_end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the
  /// clause. These expressions represent private variables (for arrays, single
  /// array element) in the final assignment statement performed by the
  /// lastprivate clause.
  void setSourceExprs(ArrayRef<Expr *> SrcExprs);

  /// Get the list of helper source expressions.
  MutableArrayRef<Expr *> getSourceExprs() {
    return MutableArrayRef<Expr *>(getPrivateCopies().end(), varlist_size());
  }
  ArrayRef<const Expr *> getSourceExprs() const {
    return llvm::makeArrayRef(getPrivateCopies().end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the
  /// clause. These expressions represent original variables (for arrays, single
  /// array element) in the final assignment statement performed by the
  /// lastprivate clause.
  void setDestinationExprs(ArrayRef<Expr *> DstExprs);

  /// Get the list of helper destination expressions.
  MutableArrayRef<Expr *> getDestinationExprs() {
    return MutableArrayRef<Expr *>(getSourceExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getDestinationExprs() const {
    return llvm::makeArrayRef(getSourceExprs().end(), varlist_size());
  }

  /// Set list of helper assignment expressions, required for proper
  /// codegen of the clause. These expressions are assignment expressions that
  /// assign private copy of the variable to original variable.
  void setAssignmentOps(ArrayRef<Expr *> AssignmentOps);

  /// Get the list of helper assignment expressions.
  MutableArrayRef<Expr *> getAssignmentOps() {
    return MutableArrayRef<Expr *>(getDestinationExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getAssignmentOps() const {
    return llvm::makeArrayRef(getDestinationExprs().end(), varlist_size());
  }

  /// Sets lastprivate kind.
  void setKind(OpenMPLastprivateModifier Kind) { LPKind = Kind; }
  /// Sets location of the lastprivate kind.
  void setKindLoc(SourceLocation Loc) { LPKindLoc = Loc; }
  /// Sets colon symbol location.
  void setColonLoc(SourceLocation Loc) { ColonLoc = Loc; }

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param C AST context.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param VL List of references to the variables.
  /// \param SrcExprs List of helper expressions for proper generation of
  /// assignment operation required for lastprivate clause. This list represents
  /// private variables (for arrays, single array element).
  /// \param DstExprs List of helper expressions for proper generation of
  /// assignment operation required for lastprivate clause. This list represents
  /// original variables (for arrays, single array element).
  /// \param AssignmentOps List of helper expressions that represents assignment
  /// operation:
  /// \code
  /// DstExprs = SrcExprs;
  /// \endcode
  /// Required for proper codegen of final assignment performed by the
  /// lastprivate clause.
  /// \param LPKind Lastprivate kind, e.g. 'conditional'.
  /// \param LPKindLoc Location of the lastprivate kind.
  /// \param ColonLoc Location of the ':' symbol if lastprivate kind is used.
  /// \param PreInit Statement that must be executed before entering the OpenMP
  /// region with this clause.
  /// \param PostUpdate Expression that must be executed after exit from the
  /// OpenMP region with this clause.
  static OMPLastprivateClause *
  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc,
         SourceLocation EndLoc, ArrayRef<Expr *> VL, ArrayRef<Expr *> SrcExprs,
         ArrayRef<Expr *> DstExprs, ArrayRef<Expr *> AssignmentOps,
         OpenMPLastprivateModifier LPKind, SourceLocation LPKindLoc,
         SourceLocation ColonLoc, Stmt *PreInit, Expr *PostUpdate);

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  static OMPLastprivateClause *CreateEmpty(const ASTContext &C, unsigned N);

  /// Lastprivate kind.
  OpenMPLastprivateModifier getKind() const { return LPKind; }
  /// Returns the location of the lastprivate kind.
  SourceLocation getKindLoc() const { return LPKindLoc; }
  /// Returns the location of the ':' symbol, if any.
  SourceLocation getColonLoc() const { return ColonLoc; }

  using helper_expr_iterator = MutableArrayRef<Expr *>::iterator;
  using helper_expr_const_iterator = ArrayRef<const Expr *>::iterator;
  using helper_expr_range = llvm::iterator_range<helper_expr_iterator>;
  using helper_expr_const_range =
      llvm::iterator_range<helper_expr_const_iterator>;

  /// Set list of helper expressions, required for generation of private
  /// copies of original lastprivate variables.
  void setPrivateCopies(ArrayRef<Expr *> PrivateCopies);

  helper_expr_const_range private_copies() const {
    return helper_expr_const_range(getPrivateCopies().begin(),
                                   getPrivateCopies().end());
  }

  helper_expr_range private_copies() {
    return helper_expr_range(getPrivateCopies().begin(),
                             getPrivateCopies().end());
  }

  helper_expr_const_range source_exprs() const {
    return helper_expr_const_range(getSourceExprs().begin(),
                                   getSourceExprs().end());
  }

  helper_expr_range source_exprs() {
    return helper_expr_range(getSourceExprs().begin(), getSourceExprs().end());
  }

  helper_expr_const_range destination_exprs() const {
    return helper_expr_const_range(getDestinationExprs().begin(),
                                   getDestinationExprs().end());
  }

  helper_expr_range destination_exprs() {
    return helper_expr_range(getDestinationExprs().begin(),
                             getDestinationExprs().end());
  }

  helper_expr_const_range assignment_ops() const {
    return helper_expr_const_range(getAssignmentOps().begin(),
                                   getAssignmentOps().end());
  }

  helper_expr_range assignment_ops() {
    return helper_expr_range(getAssignmentOps().begin(),
                             getAssignmentOps().end());
  }

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPLastprivateClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_lastprivate;
  }
};

/// This represents clause 'shared' in the '#pragma omp ...' directives.
///
/// \code
/// #pragma omp parallel shared(a,b)
/// \endcode
/// In this example directive '#pragma omp parallel' has clause 'shared'
/// with the variables 'a' and 'b'.
class OMPSharedClause final
    : public OMPVarListClause<OMPSharedClause>,
      private llvm::TrailingObjects<OMPSharedClause, Expr *> {
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param N Number of the variables in the clause.
  OMPSharedClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                  SourceLocation EndLoc, unsigned N)
      : OMPVarListClause<OMPSharedClause>(llvm::omp::OMPC_shared, StartLoc,
                                          LParenLoc, EndLoc, N) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPSharedClause(unsigned N)
      : OMPVarListClause<OMPSharedClause>(llvm::omp::OMPC_shared,
                                          SourceLocation(), SourceLocation(),
                                          SourceLocation(), N) {}

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param C AST context.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param VL List of references to the variables.
  static OMPSharedClause *Create(const ASTContext &C, SourceLocation StartLoc,
                                 SourceLocation LParenLoc,
                                 SourceLocation EndLoc, ArrayRef<Expr *> VL);

  /// Creates an empty clause with \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  static OMPSharedClause *CreateEmpty(const ASTContext &C, unsigned N);

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPSharedClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_shared;
  }
};

/// This represents clause 'reduction' in the '#pragma omp ...'
/// directives.
///
/// \code
/// #pragma omp parallel reduction(+:a,b)
/// \endcode
/// In this example directive '#pragma omp parallel' has clause 'reduction'
/// with operator '+' and the variables 'a' and 'b'.
class OMPReductionClause final
    : public OMPVarListClause<OMPReductionClause>,
      public OMPClauseWithPostUpdate,
      private llvm::TrailingObjects<OMPReductionClause, Expr *> {
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Reduction modifier.
  OpenMPReductionClauseModifier Modifier = OMPC_REDUCTION_unknown;

  /// Reduction modifier location.
  SourceLocation ModifierLoc;

  /// Location of ':'.
  SourceLocation ColonLoc;

  /// Nested name specifier for C++.
  NestedNameSpecifierLoc QualifierLoc;

  /// Name of custom operator.
  DeclarationNameInfo NameInfo;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param ModifierLoc Modifier location.
  /// \param ColonLoc Location of ':'.
  /// \param EndLoc Ending location of the clause.
  /// \param N Number of the variables in the clause.
  /// \param QualifierLoc The nested-name qualifier with location information
  /// \param NameInfo The full name info for reduction identifier.
  OMPReductionClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                     SourceLocation ModifierLoc, SourceLocation ColonLoc,
                     SourceLocation EndLoc,
                     OpenMPReductionClauseModifier Modifier, unsigned N,
                     NestedNameSpecifierLoc QualifierLoc,
                     const DeclarationNameInfo &NameInfo)
      : OMPVarListClause<OMPReductionClause>(llvm::omp::OMPC_reduction,
                                             StartLoc, LParenLoc, EndLoc, N),
        OMPClauseWithPostUpdate(this), Modifier(Modifier),
        ModifierLoc(ModifierLoc), ColonLoc(ColonLoc),
        QualifierLoc(QualifierLoc), NameInfo(NameInfo) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPReductionClause(unsigned N)
      : OMPVarListClause<OMPReductionClause>(llvm::omp::OMPC_reduction,
                                             SourceLocation(), SourceLocation(),
                                             SourceLocation(), N),
        OMPClauseWithPostUpdate(this) {}

  /// Sets reduction modifier.
  void setModifier(OpenMPReductionClauseModifier M) { Modifier = M; }

  /// Sets location of the modifier.
  void setModifierLoc(SourceLocation Loc) { ModifierLoc = Loc; }

  /// Sets location of ':' symbol in clause.
  void setColonLoc(SourceLocation CL) { ColonLoc = CL; }

  /// Sets the name info for specified reduction identifier.
  void setNameInfo(DeclarationNameInfo DNI) { NameInfo = DNI; }

  /// Sets the nested name specifier.
  void setQualifierLoc(NestedNameSpecifierLoc NSL) { QualifierLoc = NSL; }

  /// Set list of helper expressions, required for proper codegen of the
  /// clause. These expressions represent private copy of the reduction
  /// variable.
  void setPrivates(ArrayRef<Expr *> Privates);

  /// Get the list of helper privates.
  MutableArrayRef<Expr *> getPrivates() {
    return MutableArrayRef<Expr *>(varlist_end(), varlist_size());
  }
  ArrayRef<const Expr *> getPrivates() const {
    return llvm::makeArrayRef(varlist_end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the
  /// clause. These expressions represent LHS expression in the final
  /// reduction expression performed by the reduction clause.
  void setLHSExprs(ArrayRef<Expr *> LHSExprs);

  /// Get the list of helper LHS expressions.
  MutableArrayRef<Expr *> getLHSExprs() {
    return MutableArrayRef<Expr *>(getPrivates().end(), varlist_size());
  }
  ArrayRef<const Expr *> getLHSExprs() const {
    return llvm::makeArrayRef(getPrivates().end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the
  /// clause. These expressions represent RHS expression in the final
  /// reduction expression performed by the reduction clause.
  /// Also, variables in these expressions are used for proper initialization of
  /// reduction copies.
  void setRHSExprs(ArrayRef<Expr *> RHSExprs);

  /// Get the list of helper destination expressions.
  MutableArrayRef<Expr *> getRHSExprs() {
    return MutableArrayRef<Expr *>(getLHSExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getRHSExprs() const {
    return llvm::makeArrayRef(getLHSExprs().end(), varlist_size());
  }

  /// Set list of helper reduction expressions, required for proper
  /// codegen of the clause. These expressions are binary expressions or
  /// operator/custom reduction call that calculates new value from source
  /// helper expressions to destination helper expressions.
  void setReductionOps(ArrayRef<Expr *> ReductionOps);

  /// Get the list of helper reduction expressions.
  MutableArrayRef<Expr *> getReductionOps() {
    return MutableArrayRef<Expr *>(getRHSExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getReductionOps() const {
    return llvm::makeArrayRef(getRHSExprs().end(), varlist_size());
  }

  /// Set list of helper copy operations for inscan reductions.
  /// The form is: Temps[i] = LHS[i];
  void setInscanCopyOps(ArrayRef<Expr *> Ops);

  /// Get the list of helper inscan copy operations.
  MutableArrayRef<Expr *> getInscanCopyOps() {
    return MutableArrayRef<Expr *>(getReductionOps().end(), varlist_size());
  }
  ArrayRef<const Expr *> getInscanCopyOps() const {
    return llvm::makeArrayRef(getReductionOps().end(), varlist_size());
  }

  /// Set list of helper temp vars for inscan copy array operations.
  void setInscanCopyArrayTemps(ArrayRef<Expr *> CopyArrayTemps);

  /// Get the list of helper inscan copy temps.
  MutableArrayRef<Expr *> getInscanCopyArrayTemps() {
    return MutableArrayRef<Expr *>(getInscanCopyOps().end(), varlist_size());
  }
  ArrayRef<const Expr *> getInscanCopyArrayTemps() const {
    return llvm::makeArrayRef(getInscanCopyOps().end(), varlist_size());
  }

  /// Set list of helper temp elements vars for inscan copy array operations.
  void setInscanCopyArrayElems(ArrayRef<Expr *> CopyArrayElems);

  /// Get the list of helper inscan copy temps.
  MutableArrayRef<Expr *> getInscanCopyArrayElems() {
    return MutableArrayRef<Expr *>(getInscanCopyArrayTemps().end(),
                                   varlist_size());
  }
  ArrayRef<const Expr *> getInscanCopyArrayElems() const {
    return llvm::makeArrayRef(getInscanCopyArrayTemps().end(), varlist_size());
  }

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param ModifierLoc Modifier location.
  /// \param ColonLoc Location of ':'.
  /// \param EndLoc Ending location of the clause.
  /// \param VL The variables in the clause.
  /// \param QualifierLoc The nested-name qualifier with location information
  /// \param NameInfo The full name info for reduction identifier.
  /// \param Privates List of helper expressions for proper generation of
  /// private copies.
  /// \param LHSExprs List of helper expressions for proper generation of
  /// assignment operation required for copyprivate clause. This list represents
  /// LHSs of the reduction expressions.
  /// \param RHSExprs List of helper expressions for proper generation of
  /// assignment operation required for copyprivate clause. This list represents
  /// RHSs of the reduction expressions.
  /// Also, variables in these expressions are used for proper initialization of
  /// reduction copies.
  /// \param ReductionOps List of helper expressions that represents reduction
  /// expressions:
  /// \code
  /// LHSExprs binop RHSExprs;
  /// operator binop(LHSExpr, RHSExpr);
  /// <CutomReduction>(LHSExpr, RHSExpr);
  /// \endcode
  /// Required for proper codegen of final reduction operation performed by the
  /// reduction clause.
  /// \param CopyOps List of copy operations for inscan reductions:
  /// \code
  /// TempExprs = LHSExprs;
  /// \endcode
  /// \param CopyArrayTemps Temp arrays for prefix sums.
  /// \param CopyArrayElems Temp arrays for prefix sums.
  /// \param PreInit Statement that must be executed before entering the OpenMP
  /// region with this clause.
  /// \param PostUpdate Expression that must be executed after exit from the
  /// OpenMP region with this clause.
  static OMPReductionClause *
  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc,
         SourceLocation ModifierLoc, SourceLocation ColonLoc,
         SourceLocation EndLoc, OpenMPReductionClauseModifier Modifier,
         ArrayRef<Expr *> VL, NestedNameSpecifierLoc QualifierLoc,
         const DeclarationNameInfo &NameInfo, ArrayRef<Expr *> Privates,
         ArrayRef<Expr *> LHSExprs, ArrayRef<Expr *> RHSExprs,
         ArrayRef<Expr *> ReductionOps, ArrayRef<Expr *> CopyOps,
         ArrayRef<Expr *> CopyArrayTemps, ArrayRef<Expr *> CopyArrayElems,
         Stmt *PreInit, Expr *PostUpdate);

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  /// \param Modifier Reduction modifier.
  static OMPReductionClause *
  CreateEmpty(const ASTContext &C, unsigned N,
              OpenMPReductionClauseModifier Modifier);

  /// Returns modifier.
  OpenMPReductionClauseModifier getModifier() const { return Modifier; }

  /// Returns modifier location.
  SourceLocation getModifierLoc() const { return ModifierLoc; }

  /// Gets location of ':' symbol in clause.
  SourceLocation getColonLoc() const { return ColonLoc; }

  /// Gets the name info for specified reduction identifier.
  const DeclarationNameInfo &getNameInfo() const { return NameInfo; }

  /// Gets the nested name specifier.
  NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }

  using helper_expr_iterator = MutableArrayRef<Expr *>::iterator;
  using helper_expr_const_iterator = ArrayRef<const Expr *>::iterator;
  using helper_expr_range = llvm::iterator_range<helper_expr_iterator>;
  using helper_expr_const_range =
      llvm::iterator_range<helper_expr_const_iterator>;

  helper_expr_const_range privates() const {
    return helper_expr_const_range(getPrivates().begin(), getPrivates().end());
  }

  helper_expr_range privates() {
    return helper_expr_range(getPrivates().begin(), getPrivates().end());
  }

  helper_expr_const_range lhs_exprs() const {
    return helper_expr_const_range(getLHSExprs().begin(), getLHSExprs().end());
  }

  helper_expr_range lhs_exprs() {
    return helper_expr_range(getLHSExprs().begin(), getLHSExprs().end());
  }

  helper_expr_const_range rhs_exprs() const {
    return helper_expr_const_range(getRHSExprs().begin(), getRHSExprs().end());
  }

  helper_expr_range rhs_exprs() {
    return helper_expr_range(getRHSExprs().begin(), getRHSExprs().end());
  }

  helper_expr_const_range reduction_ops() const {
    return helper_expr_const_range(getReductionOps().begin(),
                                   getReductionOps().end());
  }

  helper_expr_range reduction_ops() {
    return helper_expr_range(getReductionOps().begin(),
                             getReductionOps().end());
  }

  helper_expr_const_range copy_ops() const {
    return helper_expr_const_range(getInscanCopyOps().begin(),
                                   getInscanCopyOps().end());
  }

  helper_expr_range copy_ops() {
    return helper_expr_range(getInscanCopyOps().begin(),
                             getInscanCopyOps().end());
  }

  helper_expr_const_range copy_array_temps() const {
    return helper_expr_const_range(getInscanCopyArrayTemps().begin(),
                                   getInscanCopyArrayTemps().end());
  }

  helper_expr_range copy_array_temps() {
    return helper_expr_range(getInscanCopyArrayTemps().begin(),
                             getInscanCopyArrayTemps().end());
  }

  helper_expr_const_range copy_array_elems() const {
    return helper_expr_const_range(getInscanCopyArrayElems().begin(),
                                   getInscanCopyArrayElems().end());
  }

  helper_expr_range copy_array_elems() {
    return helper_expr_range(getInscanCopyArrayElems().begin(),
                             getInscanCopyArrayElems().end());
  }

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPReductionClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }
  const_child_range used_children() const {
    auto Children = const_cast<OMPReductionClause *>(this)->used_children();
    return const_child_range(Children.begin(), Children.end());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_reduction;
  }
};

/// This represents clause 'task_reduction' in the '#pragma omp taskgroup'
/// directives.
///
/// \code
/// #pragma omp taskgroup task_reduction(+:a,b)
/// \endcode
/// In this example directive '#pragma omp taskgroup' has clause
/// 'task_reduction' with operator '+' and the variables 'a' and 'b'.
class OMPTaskReductionClause final
    : public OMPVarListClause<OMPTaskReductionClause>,
      public OMPClauseWithPostUpdate,
      private llvm::TrailingObjects<OMPTaskReductionClause, Expr *> {
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Location of ':'.
  SourceLocation ColonLoc;

  /// Nested name specifier for C++.
  NestedNameSpecifierLoc QualifierLoc;

  /// Name of custom operator.
  DeclarationNameInfo NameInfo;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param ColonLoc Location of ':'.
  /// \param N Number of the variables in the clause.
  /// \param QualifierLoc The nested-name qualifier with location information
  /// \param NameInfo The full name info for reduction identifier.
  OMPTaskReductionClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                         SourceLocation ColonLoc, SourceLocation EndLoc,
                         unsigned N, NestedNameSpecifierLoc QualifierLoc,
                         const DeclarationNameInfo &NameInfo)
      : OMPVarListClause<OMPTaskReductionClause>(
            llvm::omp::OMPC_task_reduction, StartLoc, LParenLoc, EndLoc, N),
        OMPClauseWithPostUpdate(this), ColonLoc(ColonLoc),
        QualifierLoc(QualifierLoc), NameInfo(NameInfo) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPTaskReductionClause(unsigned N)
      : OMPVarListClause<OMPTaskReductionClause>(
            llvm::omp::OMPC_task_reduction, SourceLocation(), SourceLocation(),
            SourceLocation(), N),
        OMPClauseWithPostUpdate(this) {}

  /// Sets location of ':' symbol in clause.
  void setColonLoc(SourceLocation CL) { ColonLoc = CL; }

  /// Sets the name info for specified reduction identifier.
  void setNameInfo(DeclarationNameInfo DNI) { NameInfo = DNI; }

  /// Sets the nested name specifier.
  void setQualifierLoc(NestedNameSpecifierLoc NSL) { QualifierLoc = NSL; }

  /// Set list of helper expressions, required for proper codegen of the clause.
  /// These expressions represent private copy of the reduction variable.
  void setPrivates(ArrayRef<Expr *> Privates);

  /// Get the list of helper privates.
  MutableArrayRef<Expr *> getPrivates() {
    return MutableArrayRef<Expr *>(varlist_end(), varlist_size());
  }
  ArrayRef<const Expr *> getPrivates() const {
    return llvm::makeArrayRef(varlist_end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the clause.
  /// These expressions represent LHS expression in the final reduction
  /// expression performed by the reduction clause.
  void setLHSExprs(ArrayRef<Expr *> LHSExprs);

  /// Get the list of helper LHS expressions.
  MutableArrayRef<Expr *> getLHSExprs() {
    return MutableArrayRef<Expr *>(getPrivates().end(), varlist_size());
  }
  ArrayRef<const Expr *> getLHSExprs() const {
    return llvm::makeArrayRef(getPrivates().end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the clause.
  /// These expressions represent RHS expression in the final reduction
  /// expression performed by the reduction clause. Also, variables in these
  /// expressions are used for proper initialization of reduction copies.
  void setRHSExprs(ArrayRef<Expr *> RHSExprs);

  ///  Get the list of helper destination expressions.
  MutableArrayRef<Expr *> getRHSExprs() {
    return MutableArrayRef<Expr *>(getLHSExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getRHSExprs() const {
    return llvm::makeArrayRef(getLHSExprs().end(), varlist_size());
  }

  /// Set list of helper reduction expressions, required for proper
  /// codegen of the clause. These expressions are binary expressions or
  /// operator/custom reduction call that calculates new value from source
  /// helper expressions to destination helper expressions.
  void setReductionOps(ArrayRef<Expr *> ReductionOps);

  ///  Get the list of helper reduction expressions.
  MutableArrayRef<Expr *> getReductionOps() {
    return MutableArrayRef<Expr *>(getRHSExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getReductionOps() const {
    return llvm::makeArrayRef(getRHSExprs().end(), varlist_size());
  }

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param ColonLoc Location of ':'.
  /// \param EndLoc Ending location of the clause.
  /// \param VL The variables in the clause.
  /// \param QualifierLoc The nested-name qualifier with location information
  /// \param NameInfo The full name info for reduction identifier.
  /// \param Privates List of helper expressions for proper generation of
  /// private copies.
  /// \param LHSExprs List of helper expressions for proper generation of
  /// assignment operation required for copyprivate clause. This list represents
  /// LHSs of the reduction expressions.
  /// \param RHSExprs List of helper expressions for proper generation of
  /// assignment operation required for copyprivate clause. This list represents
  /// RHSs of the reduction expressions.
  /// Also, variables in these expressions are used for proper initialization of
  /// reduction copies.
  /// \param ReductionOps List of helper expressions that represents reduction
  /// expressions:
  /// \code
  /// LHSExprs binop RHSExprs;
  /// operator binop(LHSExpr, RHSExpr);
  /// <CutomReduction>(LHSExpr, RHSExpr);
  /// \endcode
  /// Required for proper codegen of final reduction operation performed by the
  /// reduction clause.
  /// \param PreInit Statement that must be executed before entering the OpenMP
  /// region with this clause.
  /// \param PostUpdate Expression that must be executed after exit from the
  /// OpenMP region with this clause.
  static OMPTaskReductionClause *
  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc,
         SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef<Expr *> VL,
         NestedNameSpecifierLoc QualifierLoc,
         const DeclarationNameInfo &NameInfo, ArrayRef<Expr *> Privates,
         ArrayRef<Expr *> LHSExprs, ArrayRef<Expr *> RHSExprs,
         ArrayRef<Expr *> ReductionOps, Stmt *PreInit, Expr *PostUpdate);

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  static OMPTaskReductionClause *CreateEmpty(const ASTContext &C, unsigned N);

  /// Gets location of ':' symbol in clause.
  SourceLocation getColonLoc() const { return ColonLoc; }

  /// Gets the name info for specified reduction identifier.
  const DeclarationNameInfo &getNameInfo() const { return NameInfo; }

  /// Gets the nested name specifier.
  NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }

  using helper_expr_iterator = MutableArrayRef<Expr *>::iterator;
  using helper_expr_const_iterator = ArrayRef<const Expr *>::iterator;
  using helper_expr_range = llvm::iterator_range<helper_expr_iterator>;
  using helper_expr_const_range =
      llvm::iterator_range<helper_expr_const_iterator>;

  helper_expr_const_range privates() const {
    return helper_expr_const_range(getPrivates().begin(), getPrivates().end());
  }

  helper_expr_range privates() {
    return helper_expr_range(getPrivates().begin(), getPrivates().end());
  }

  helper_expr_const_range lhs_exprs() const {
    return helper_expr_const_range(getLHSExprs().begin(), getLHSExprs().end());
  }

  helper_expr_range lhs_exprs() {
    return helper_expr_range(getLHSExprs().begin(), getLHSExprs().end());
  }

  helper_expr_const_range rhs_exprs() const {
    return helper_expr_const_range(getRHSExprs().begin(), getRHSExprs().end());
  }

  helper_expr_range rhs_exprs() {
    return helper_expr_range(getRHSExprs().begin(), getRHSExprs().end());
  }

  helper_expr_const_range reduction_ops() const {
    return helper_expr_const_range(getReductionOps().begin(),
                                   getReductionOps().end());
  }

  helper_expr_range reduction_ops() {
    return helper_expr_range(getReductionOps().begin(),
                             getReductionOps().end());
  }

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPTaskReductionClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_task_reduction;
  }
};

/// This represents clause 'in_reduction' in the '#pragma omp task' directives.
///
/// \code
/// #pragma omp task in_reduction(+:a,b)
/// \endcode
/// In this example directive '#pragma omp task' has clause 'in_reduction' with
/// operator '+' and the variables 'a' and 'b'.
class OMPInReductionClause final
    : public OMPVarListClause<OMPInReductionClause>,
      public OMPClauseWithPostUpdate,
      private llvm::TrailingObjects<OMPInReductionClause, Expr *> {
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Location of ':'.
  SourceLocation ColonLoc;

  /// Nested name specifier for C++.
  NestedNameSpecifierLoc QualifierLoc;

  /// Name of custom operator.
  DeclarationNameInfo NameInfo;

  /// Build clause with number of variables \a N.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param EndLoc Ending location of the clause.
  /// \param ColonLoc Location of ':'.
  /// \param N Number of the variables in the clause.
  /// \param QualifierLoc The nested-name qualifier with location information
  /// \param NameInfo The full name info for reduction identifier.
  OMPInReductionClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                       SourceLocation ColonLoc, SourceLocation EndLoc,
                       unsigned N, NestedNameSpecifierLoc QualifierLoc,
                       const DeclarationNameInfo &NameInfo)
      : OMPVarListClause<OMPInReductionClause>(llvm::omp::OMPC_in_reduction,
                                               StartLoc, LParenLoc, EndLoc, N),
        OMPClauseWithPostUpdate(this), ColonLoc(ColonLoc),
        QualifierLoc(QualifierLoc), NameInfo(NameInfo) {}

  /// Build an empty clause.
  ///
  /// \param N Number of variables.
  explicit OMPInReductionClause(unsigned N)
      : OMPVarListClause<OMPInReductionClause>(
            llvm::omp::OMPC_in_reduction, SourceLocation(), SourceLocation(),
            SourceLocation(), N),
        OMPClauseWithPostUpdate(this) {}

  /// Sets location of ':' symbol in clause.
  void setColonLoc(SourceLocation CL) { ColonLoc = CL; }

  /// Sets the name info for specified reduction identifier.
  void setNameInfo(DeclarationNameInfo DNI) { NameInfo = DNI; }

  /// Sets the nested name specifier.
  void setQualifierLoc(NestedNameSpecifierLoc NSL) { QualifierLoc = NSL; }

  /// Set list of helper expressions, required for proper codegen of the clause.
  /// These expressions represent private copy of the reduction variable.
  void setPrivates(ArrayRef<Expr *> Privates);

  /// Get the list of helper privates.
  MutableArrayRef<Expr *> getPrivates() {
    return MutableArrayRef<Expr *>(varlist_end(), varlist_size());
  }
  ArrayRef<const Expr *> getPrivates() const {
    return llvm::makeArrayRef(varlist_end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the clause.
  /// These expressions represent LHS expression in the final reduction
  /// expression performed by the reduction clause.
  void setLHSExprs(ArrayRef<Expr *> LHSExprs);

  /// Get the list of helper LHS expressions.
  MutableArrayRef<Expr *> getLHSExprs() {
    return MutableArrayRef<Expr *>(getPrivates().end(), varlist_size());
  }
  ArrayRef<const Expr *> getLHSExprs() const {
    return llvm::makeArrayRef(getPrivates().end(), varlist_size());
  }

  /// Set list of helper expressions, required for proper codegen of the clause.
  /// These expressions represent RHS expression in the final reduction
  /// expression performed by the reduction clause. Also, variables in these
  /// expressions are used for proper initialization of reduction copies.
  void setRHSExprs(ArrayRef<Expr *> RHSExprs);

  ///  Get the list of helper destination expressions.
  MutableArrayRef<Expr *> getRHSExprs() {
    return MutableArrayRef<Expr *>(getLHSExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getRHSExprs() const {
    return llvm::makeArrayRef(getLHSExprs().end(), varlist_size());
  }

  /// Set list of helper reduction expressions, required for proper
  /// codegen of the clause. These expressions are binary expressions or
  /// operator/custom reduction call that calculates new value from source
  /// helper expressions to destination helper expressions.
  void setReductionOps(ArrayRef<Expr *> ReductionOps);

  ///  Get the list of helper reduction expressions.
  MutableArrayRef<Expr *> getReductionOps() {
    return MutableArrayRef<Expr *>(getRHSExprs().end(), varlist_size());
  }
  ArrayRef<const Expr *> getReductionOps() const {
    return llvm::makeArrayRef(getRHSExprs().end(), varlist_size());
  }

  /// Set list of helper reduction taskgroup descriptors.
  void setTaskgroupDescriptors(ArrayRef<Expr *> ReductionOps);

  ///  Get the list of helper reduction taskgroup descriptors.
  MutableArrayRef<Expr *> getTaskgroupDescriptors() {
    return MutableArrayRef<Expr *>(getReductionOps().end(), varlist_size());
  }
  ArrayRef<const Expr *> getTaskgroupDescriptors() const {
    return llvm::makeArrayRef(getReductionOps().end(), varlist_size());
  }

public:
  /// Creates clause with a list of variables \a VL.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param ColonLoc Location of ':'.
  /// \param EndLoc Ending location of the clause.
  /// \param VL The variables in the clause.
  /// \param QualifierLoc The nested-name qualifier with location information
  /// \param NameInfo The full name info for reduction identifier.
  /// \param Privates List of helper expressions for proper generation of
  /// private copies.
  /// \param LHSExprs List of helper expressions for proper generation of
  /// assignment operation required for copyprivate clause. This list represents
  /// LHSs of the reduction expressions.
  /// \param RHSExprs List of helper expressions for proper generation of
  /// assignment operation required for copyprivate clause. This list represents
  /// RHSs of the reduction expressions.
  /// Also, variables in these expressions are used for proper initialization of
  /// reduction copies.
  /// \param ReductionOps List of helper expressions that represents reduction
  /// expressions:
  /// \code
  /// LHSExprs binop RHSExprs;
  /// operator binop(LHSExpr, RHSExpr);
  /// <CutomReduction>(LHSExpr, RHSExpr);
  /// \endcode
  /// Required for proper codegen of final reduction operation performed by the
  /// reduction clause.
  /// \param TaskgroupDescriptors List of helper taskgroup descriptors for
  /// corresponding items in parent taskgroup task_reduction clause.
  /// \param PreInit Statement that must be executed before entering the OpenMP
  /// region with this clause.
  /// \param PostUpdate Expression that must be executed after exit from the
  /// OpenMP region with this clause.
  static OMPInReductionClause *
  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc,
         SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef<Expr *> VL,
         NestedNameSpecifierLoc QualifierLoc,
         const DeclarationNameInfo &NameInfo, ArrayRef<Expr *> Privates,
         ArrayRef<Expr *> LHSExprs, ArrayRef<Expr *> RHSExprs,
         ArrayRef<Expr *> ReductionOps, ArrayRef<Expr *> TaskgroupDescriptors,
         Stmt *PreInit, Expr *PostUpdate);

  /// Creates an empty clause with the place for \a N variables.
  ///
  /// \param C AST context.
  /// \param N The number of variables.
  static OMPInReductionClause *CreateEmpty(const ASTContext &C, unsigned N);

  /// Gets location of ':' symbol in clause.
  SourceLocation getColonLoc() const { return ColonLoc; }

  /// Gets the name info for specified reduction identifier.
  const DeclarationNameInfo &getNameInfo() const { return NameInfo; }

  /// Gets the nested name specifier.
  NestedNameSpecifierLoc getQualifierLoc() const { return QualifierLoc; }

  using helper_expr_iterator = MutableArrayRef<Expr *>::iterator;
  using helper_expr_const_iterator = ArrayRef<const Expr *>::iterator;
  using helper_expr_range = llvm::iterator_range<helper_expr_iterator>;
  using helper_expr_const_range =
      llvm::iterator_range<helper_expr_const_iterator>;

  helper_expr_const_range privates() const {
    return helper_expr_const_range(getPrivates().begin(), getPrivates().end());
  }

  helper_expr_range privates() {
    return helper_expr_range(getPrivates().begin(), getPrivates().end());
  }

  helper_expr_const_range lhs_exprs() const {
    return helper_expr_const_range(getLHSExprs().begin(), getLHSExprs().end());
  }

  helper_expr_range lhs_exprs() {
    return helper_expr_range(getLHSExprs().begin(), getLHSExprs().end());
  }

  helper_expr_const_range rhs_exprs() const {
    return helper_expr_const_range(getRHSExprs().begin(), getRHSExprs().end());
  }

  helper_expr_range rhs_exprs() {
    return helper_expr_range(getRHSExprs().begin(), getRHSExprs().end());
  }

  helper_expr_const_range reduction_ops() const {
    return helper_expr_const_range(getReductionOps().begin(),
                                   getReductionOps().end());
  }

  helper_expr_range reduction_ops() {
    return helper_expr_range(getReductionOps().begin(),
                             getReductionOps().end());
  }

  helper_expr_const_range taskgroup_descriptors() const {
    return helper_expr_const_range(getTaskgroupDescriptors().begin(),
                                   getTaskgroupDescriptors().end());
  }

  helper_expr_range taskgroup_descriptors() {
    return helper_expr_range(getTaskgroupDescriptors().begin(),
                             getTaskgroupDescriptors().end());
  }

  child_range children() {
    return child_range(reinterpret_cast<Stmt **>(varlist_begin()),
                       reinterpret_cast<Stmt **>(varlist_end()));
  }

  const_child_range children() const {
    auto Children = const_cast<OMPInReductionClause *>(this)->children();
    return const_child_range(Children.begin(), Children.end());
  }

  child_range used_children() {
    return child_range(child_iterator(), child_iterator());
  }
  const_child_range used_children() const {
    return const_child_range(const_child_iterator(), const_child_iterator());
  }

  static bool classof(const OMPClause *T) {
    return T->getClauseKind() == llvm::omp::OMPC_in_reduction;
  }
};

/// This represents clause 'linear' in the '#pragma omp ...'
/// directives.
///
/// \code
/// #pragma omp simd linear(a,b : 2)
/// \endcode
/// In this example directive '#pragma omp simd' has clause 'linear'
/// with variables 'a', 'b' and linear step '2'.
class OMPLinearClause final
    : public OMPVarListClause<OMPLinearClause>,
      public OMPClauseWithPostUpdate,
      private llvm::TrailingObjects<OMPLinearClause, Expr *> {
  friend class OMPClauseReader;
  friend OMPVarListClause;
  friend TrailingObjects;

  /// Modifier of 'linear' clause.
  OpenMPLinearClauseKind Modifier = OMPC_LINEAR_val;

  /// Location of linear modifier if any.
  SourceLocation ModifierLoc;

  /// Location of ':'.
  SourceLocation ColonLoc;

  /// Sets the linear step for clause.
  void setStep(Expr *Step) { *(getFinals().end()) = Step; }

  /// Sets the expression to calculate linear step for clause.
  void setCalcStep(Expr *CalcStep) { *(getFinals().end() + 1) = CalcStep; }

  /// Build 'linear' clause with given number of variables \a NumVars.
  ///
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param ColonLoc Location of ':'.
  /// \param EndLoc Ending location of the clause.
  /// \param NumVars Number of variables.
  OMPLinearClause(SourceLocation StartLoc, SourceLocation LParenLoc,
                  OpenMPLinearClauseKind Modifier, SourceLocation ModifierLoc,
                  SourceLocation ColonLoc, SourceLocation EndLoc,
                  unsigned NumVars)
      : OMPVarListClause<OMPLinearClause>(llvm::omp::OMPC_linear, StartLoc,
                                          LParenLoc, EndLoc, NumVars),
        OMPClauseWithPostUpdate(this), Modifier(Modifier),
        ModifierLoc(ModifierLoc), ColonLoc(ColonLoc) {}

  /// Build an empty clause.
  ///
  /// \param NumVars Number of variables.
  explicit OMPLinearClause(unsigned NumVars)
      : OMPVarListClause<OMPLinearClause>(llvm::omp::OMPC_linear,
                                          SourceLocation(), SourceLocation(),
                                          SourceLocation(), NumVars),
        OMPClauseWithPostUpdate(this) {}

  /// Gets the list of initial values for linear variables.
  ///
  /// There are NumVars expressions with initial values allocated after the
  /// varlist, they are followed by NumVars update expressions (used to update
  /// the linear variable's value on current iteration) and they are followed by
  /// NumVars final expressions (used to calculate the linear variable's
  /// value after the loop body). After these lists, there are 2 helper
  /// expressions - linear step and a helper to calculate it before the
  /// loop body (used when the linear step is not constant):
  ///
  /// { Vars[] /* in OMPVarListClause */; Privates[]; Inits[]; Updates[];
  /// Finals[]; Step; CalcStep; }
  MutableArrayRef<Expr *> getPrivates() {
    return MutableArrayRef<Expr *>(varlist_end(), varlist_size());
  }
  ArrayRef<const Expr *> getPrivates() const {
    return llvm::makeArrayRef(varlist_end(), varlist_size());
  }

  MutableArrayRef<Expr *> getInits() {
    return MutableArrayRef<Expr *>(getPrivates().end(), varlist_size());
  }
  ArrayRef<const Expr *> getInits() const {
    return llvm::makeArrayRef(getPrivates().end(), varlist_size());
  }

  /// Sets the list of update expressions for linear variables.
  MutableArrayRef<Expr *> getUpdates() {
    return MutableArrayRef<Expr *>(getInits().end(), varlist_size());
  }
  ArrayRef<const Expr *> getUpdates() const {
    return llvm::makeArrayRef(getInits().end(), varlist_size());
  }

  /// Sets the list of final update expressions for linear variables.
  MutableArrayRef<Expr *> getFinals() {
    return MutableArrayRef<Expr *>(getUpdates().end(), varlist_size());
  }
  ArrayRef<const Expr *> getFinals() const {
    return llvm::makeArrayRef(getUpdates().end(), varlist_size());
  }

  /// Gets the list of used expressions for linear variables.
  MutableArrayRef<Expr *> getUsedExprs() {
    return MutableArrayRef<Expr *>(getFinals().end() + 2, varlist_size() + 1);
  }
  ArrayRef<const Expr *> getUsedExprs() const {
    return llvm::makeArrayRef(getFinals().end() + 2, varlist_size() + 1);
  }

  /// Sets the list of the copies of original linear variables.
  /// \param PL List of expressions.
  void setPrivates(ArrayRef<Expr *> PL);

  /// Sets the list of the initial values for linear variables.
  /// \param IL List of expressions.
  void setInits(ArrayRef<Expr *> IL);

public:
  /// Creates clause with a list of variables \a VL and a linear step
  /// \a Step.
  ///
  /// \param C AST Context.
  /// \param StartLoc Starting location of the clause.
  /// \param LParenLoc Location of '('.
  /// \param Modifier Modifier of 'linear' clause.
  /// \param ModifierLoc Modifier location.
  /// \param ColonLoc Location of ':'.
  /// \param EndLoc Ending location of the clause.
  /// \param VL List of references to the variables.
  /// \param PL List of private copies of original variables.
  /// \param IL List of initial values for the variables.
  /// \param Step Linear step.
  /// \param CalcStep Calculation of the linear step.
  /// \param PreInit Statement that must be executed before entering the OpenMP
  /// region with this clause.
  /// \param PostUpdate Expression that must be executed after exit from the
  /// OpenMP region with this clause.
  static OMPLinearClause *
  Create(const ASTContext &C, SourceLocation StartLoc, SourceLocation LParenLoc,
         OpenMPLinearClauseKind Modifier, SourceLocation ModifierLoc,
         SourceLocation ColonLoc, SourceLocation EndLoc, ArrayRef<Expr *> VL,
         ArrayRef<Expr *> PL, ArrayRef<Expr *> IL, Expr *Step, Expr *CalcStep,
         Stmt *PreInit, Expr *PostUpdate);

  /// Creates an empty clause with the place for \a NumVars variables.
  ///
  /// \param C AST context.
  /// \param NumVars Number of variables.
  static OMPLinearClause *CreateEmpty(const ASTContext &C, unsigned NumVars);

  /// Set modifier.
  void setModifier(OpenMPLinearClauseKind Kind) { Modifier = Kind; }

  /// Return modifier.
  OpenMPLinearClauseKind getModifier() const { return Modifier; }

  /// Set modifier location.
  void setModifierLoc(SourceLocation Loc) { ModifierLoc = Loc; }

  /// Return modifier location.
  SourceLocation getModifierLoc() const { return ModifierLoc; }

  /// Sets the location of ':'.
  void setColonLoc(SourceLocation Loc) { ColonLoc = Loc; }

  /// Returns the location of ':'.
  SourceLocation getColonLoc() const { return ColonLoc; }

  /// Returns linear step.
  Expr *getStep() { return *(getFinals().end()); }

  /// Returns linear step.
  const Expr *getStep() const { return *(getFinals().end()); }

  /// Returns expression to calculate linear step.
  Expr *getCalcStep() { return *(getFinals().end() + 1); }

  /// Returns expression to calculate linear step.
  const Expr *getCalcStep() const { return *(getFinals().end() + 1); }

  /// Sets the list of update expressions for linear variables.
  /// \param UL List of expressions.
  void setUpdates(ArrayRef<Expr *> UL);

4035

Coverage Report

Created: 2022-07-16 07:03