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//===--- Designator.h - Initialization Designator ---------------*- 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

//

//===----------------------------------------------------------------------===//

//

// This file defines interfaces used to represent designators (a la

// C99 designated initializers) during parsing.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_SEMA_DESIGNATOR_H

#define LLVM_CLANG_SEMA_DESIGNATOR_H

#include "clang/Basic/SourceLocation.h"

#include "llvm/ADT/SmallVector.h"

namespace clang {

class Expr;

class IdentifierInfo;

class Sema;

/// Designator - A designator in a C99 designated initializer.

///

/// This class is a discriminated union which holds the various

/// different sorts of designators possible.  A Designation is an array of

/// these.  An example of a designator are things like this:

///     [8] .field [47]        // C99 designation: 3 designators

///     [8 ... 47]  field:     // GNU extensions: 2 designators

/// These occur in initializers, e.g.:

///  int a[10] = {2, 4, [8]=9, 10};

///

class Designator {

public:

  enum DesignatorKind {

    FieldDesignator, ArrayDesignator, ArrayRangeDesignator

  };

private:

  Designator() {};

  DesignatorKind Kind;

  struct FieldDesignatorInfo {

    const IdentifierInfo *II;

    SourceLocation DotLoc;

    SourceLocation NameLoc;

  };

  struct ArrayDesignatorInfo {

    Expr *Index;

    SourceLocation LBracketLoc;

    mutable SourceLocation RBracketLoc;

  };

  struct ArrayRangeDesignatorInfo {

    Expr *Start, *End;

    SourceLocation LBracketLoc, EllipsisLoc;

    mutable SourceLocation RBracketLoc;

  };

  union {

    FieldDesignatorInfo FieldInfo;

    ArrayDesignatorInfo ArrayInfo;

    ArrayRangeDesignatorInfo ArrayRangeInfo;

  };

public:

  DesignatorKind getKind() const { return Kind; }

  bool isFieldDesignator() const { return Kind == FieldDesignator; }

  bool isArrayDesignator() const { return Kind == ArrayDesignator; }

  bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; }

  const IdentifierInfo *getField() const {

    assert(isFieldDesignator() && "Invalid accessor");

    return FieldInfo.II;

  }

  SourceLocation getDotLoc() const {

    assert(isFieldDesignator() && "Invalid accessor");

    return FieldInfo.DotLoc;

  }

  SourceLocation getFieldLoc() const {

    assert(isFieldDesignator() && "Invalid accessor");

    return FieldInfo.NameLoc;

  }

  Expr *getArrayIndex() const {

    assert(isArrayDesignator() && "Invalid accessor");

    return ArrayInfo.Index;

  }

  Expr *getArrayRangeStart() const {

    assert(isArrayRangeDesignator() && "Invalid accessor");

    return ArrayRangeInfo.Start;

  }

  Expr *getArrayRangeEnd() const {

    assert(isArrayRangeDesignator() && "Invalid accessor");

    return ArrayRangeInfo.End;

  }

  SourceLocation getLBracketLoc() const {

    assert((isArrayDesignator() || isArrayRangeDesignator()) &&

           "Invalid accessor");

    if (isArrayDesignator())

      return ArrayInfo.LBracketLoc;

    else

      return ArrayRangeInfo.LBracketLoc;

  }

  SourceLocation getRBracketLoc() const {

    assert((isArrayDesignator() || isArrayRangeDesignator()) &&

           "Invalid accessor");

    if (isArrayDesignator())

      return ArrayInfo.RBracketLoc;

    else

      return ArrayRangeInfo.RBracketLoc;

  }

  SourceLocation getEllipsisLoc() const {

    assert(isArrayRangeDesignator() && "Invalid accessor");

    return ArrayRangeInfo.EllipsisLoc;

  }

  static Designator getField(const IdentifierInfo *II, SourceLocation DotLoc,

                             SourceLocation NameLoc) {

    Designator D;

    D.Kind = FieldDesignator;

    new (&D.FieldInfo) FieldDesignatorInfo;

    D.FieldInfo.II = II;

    D.FieldInfo.DotLoc = DotLoc;

    D.FieldInfo.NameLoc = NameLoc;

    return D;

  }

  static Designator getArray(Expr *Index,

                             SourceLocation LBracketLoc) {

    Designator D;

    D.Kind = ArrayDesignator;

    new (&D.ArrayInfo) ArrayDesignatorInfo;

    D.ArrayInfo.Index = Index;

    D.ArrayInfo.LBracketLoc = LBracketLoc;

    D.ArrayInfo.RBracketLoc = SourceLocation();

    return D;

  }

  static Designator getArrayRange(Expr *Start,

                                  Expr *End,

                                  SourceLocation LBracketLoc,

                                  SourceLocation EllipsisLoc) {

    Designator D;

    D.Kind = ArrayRangeDesignator;

    new (&D.ArrayRangeInfo) ArrayRangeDesignatorInfo;

    D.ArrayRangeInfo.Start = Start;

    D.ArrayRangeInfo.End = End;

    D.ArrayRangeInfo.LBracketLoc = LBracketLoc;

    D.ArrayRangeInfo.EllipsisLoc = EllipsisLoc;

    D.ArrayRangeInfo.RBracketLoc = SourceLocation();

    return D;

  }

  void setRBracketLoc(SourceLocation RBracketLoc) const {

    assert((isArrayDesignator() || isArrayRangeDesignator()) &&

           "Invalid accessor");

    if (isArrayDesignator())

      ArrayInfo.RBracketLoc = RBracketLoc;

    else

      ArrayRangeInfo.RBracketLoc = RBracketLoc;

  }

  /// ClearExprs - Null out any expression references, which prevents

  /// them from being 'delete'd later.

  void ClearExprs(Sema &Actions) {}

  /// FreeExprs - Release any unclaimed memory for the expressions in

  /// this designator.

  void FreeExprs(Sema &Actions) {}

};

/// Designation - Represent a full designation, which is a sequence of

/// designators.  This class is mostly a helper for InitListDesignations.

class Designation {

  /// Designators - The actual designators for this initializer.

  SmallVector<Designator, 2> Designators;

public:

  /// AddDesignator - Add a designator to the end of this list.

  void AddDesignator(Designator D) {

    Designators.push_back(D);

  }

  bool empty() const { return Designators.empty(); }

  unsigned getNumDesignators() const { return Designators.size(); }

  const Designator &getDesignator(unsigned Idx) const {

    assert(Idx < Designators.size());

    return Designators[Idx];

  }

  /// ClearExprs - Null out any expression references, which prevents them from

  /// being 'delete'd later.

  void ClearExprs(Sema &Actions) {}

  /// FreeExprs - Release any unclaimed memory for the expressions in this

  /// designation.

  void FreeExprs(Sema &Actions) {}

};

} // end namespace clang

#endif