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//===--- StmtObjC.h - Classes for representing ObjC statements --*- 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

/// Defines the Objective-C statement AST node classes.

#ifndef LLVM_CLANG_AST_STMTOBJC_H

#define LLVM_CLANG_AST_STMTOBJC_H

#include "clang/AST/Stmt.h"

#include "llvm/Support/Compiler.h"

namespace clang {

/// Represents Objective-C's collection statement.

///

/// This is represented as 'for (element 'in' collection-expression)' stmt.

class ObjCForCollectionStmt : public Stmt {

  enum { ELEM, COLLECTION, BODY, END_EXPR };

  Stmt* SubExprs[END_EXPR]; // SubExprs[ELEM] is an expression or declstmt.

  SourceLocation ForLoc;

  SourceLocation RParenLoc;

public:

  ObjCForCollectionStmt(Stmt *Elem, Expr *Collect, Stmt *Body,

                        SourceLocation FCL, SourceLocation RPL);

  explicit ObjCForCollectionStmt(EmptyShell Empty) :

    Stmt(ObjCForCollectionStmtClass, Empty) { }

  Stmt *getElement() { return SubExprs[ELEM]; }

  Expr *getCollection() {

    return reinterpret_cast<Expr*>(SubExprs[COLLECTION]);

  }

  Stmt *getBody() { return SubExprs[BODY]; }

  const Stmt *getElement() const { return SubExprs[ELEM]; }

  const Expr *getCollection() const {

    return reinterpret_cast<Expr*>(SubExprs[COLLECTION]);

  }

  const Stmt *getBody() const { return SubExprs[BODY]; }

  void setElement(Stmt *S) { SubExprs[ELEM] = S; }

  void setCollection(Expr *E) {

    SubExprs[COLLECTION] = reinterpret_cast<Stmt*>(E);

  }

  void setBody(Stmt *S) { SubExprs[BODY] = S; }

  SourceLocation getForLoc() const { return ForLoc; }

  void setForLoc(SourceLocation Loc) { ForLoc = Loc; }

  SourceLocation getRParenLoc() const { return RParenLoc; }

  void setRParenLoc(SourceLocation Loc) { RParenLoc = Loc; }

  SourceLocation getBeginLoc() const LLVM_READONLY { return ForLoc; }

  SourceLocation getEndLoc() const LLVM_READONLY {

    return SubExprs[BODY]->getEndLoc();

  }

  static bool classof(const Stmt *T) {

    return T->getStmtClass() == ObjCForCollectionStmtClass;

  }

  // Iterators

  child_range children() {

    return child_range(&SubExprs[0], &SubExprs[END_EXPR]);

  }

  const_child_range children() const {

    return const_child_range(&SubExprs[0], &SubExprs[END_EXPR]);

  }

};

/// Represents Objective-C's \@catch statement.

class ObjCAtCatchStmt : public Stmt {

private:

  VarDecl *ExceptionDecl;

  Stmt *Body;

  SourceLocation AtCatchLoc, RParenLoc;

public:

  ObjCAtCatchStmt(SourceLocation atCatchLoc, SourceLocation rparenloc,

                  VarDecl *catchVarDecl,

                  Stmt *atCatchStmt)

    : Stmt(ObjCAtCatchStmtClass), ExceptionDecl(catchVarDecl),

    Body(atCatchStmt), AtCatchLoc(atCatchLoc), RParenLoc(rparenloc) { }

  explicit ObjCAtCatchStmt(EmptyShell Empty) :

    Stmt(ObjCAtCatchStmtClass, Empty) { }

  const Stmt *getCatchBody() const { return Body; }

  Stmt *getCatchBody() { return Body; }

  void setCatchBody(Stmt *S) { Body = S; }

  const VarDecl *getCatchParamDecl() const {

    return ExceptionDecl;

  }

  VarDecl *getCatchParamDecl() {

    return ExceptionDecl;

  }

  void setCatchParamDecl(VarDecl *D) { ExceptionDecl = D; }

  SourceLocation getAtCatchLoc() const { return AtCatchLoc; }

  void setAtCatchLoc(SourceLocation Loc) { AtCatchLoc = Loc; }

  SourceLocation getRParenLoc() const { return RParenLoc; }

  void setRParenLoc(SourceLocation Loc) { RParenLoc = Loc; }

  SourceLocation getBeginLoc() const LLVM_READONLY { return AtCatchLoc; }

  SourceLocation getEndLoc() const LLVM_READONLY { return Body->getEndLoc(); }

  bool hasEllipsis() const { return getCatchParamDecl() == nullptr; }

  static bool classof(const Stmt *T) {

    return T->getStmtClass() == ObjCAtCatchStmtClass;

  }

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

  const_child_range children() const {

    return const_child_range(&Body, &Body + 1);

  }

};

/// Represents Objective-C's \@finally statement

class ObjCAtFinallyStmt : public Stmt {

  SourceLocation AtFinallyLoc;

  Stmt *AtFinallyStmt;

public:

  ObjCAtFinallyStmt(SourceLocation atFinallyLoc, Stmt *atFinallyStmt)

      : Stmt(ObjCAtFinallyStmtClass), AtFinallyLoc(atFinallyLoc),

        AtFinallyStmt(atFinallyStmt) {}

  explicit ObjCAtFinallyStmt(EmptyShell Empty) :

    Stmt(ObjCAtFinallyStmtClass, Empty) { }

  const Stmt *getFinallyBody() const { return AtFinallyStmt; }

  Stmt *getFinallyBody() { return AtFinallyStmt; }

  void setFinallyBody(Stmt *S) { AtFinallyStmt = S; }

  SourceLocation getBeginLoc() const LLVM_READONLY { return AtFinallyLoc; }

  SourceLocation getEndLoc() const LLVM_READONLY {

    return AtFinallyStmt->getEndLoc();

  }

  SourceLocation getAtFinallyLoc() const { return AtFinallyLoc; }

  void setAtFinallyLoc(SourceLocation Loc) { AtFinallyLoc = Loc; }

  static bool classof(const Stmt *T) {

    return T->getStmtClass() == ObjCAtFinallyStmtClass;

  }

  child_range children() {

    return child_range(&AtFinallyStmt, &AtFinallyStmt+1);

  }

  const_child_range children() const {

    return const_child_range(&AtFinallyStmt, &AtFinallyStmt + 1);

  }

};

/// Represents Objective-C's \@try ... \@catch ... \@finally statement.

class ObjCAtTryStmt final

    : public Stmt,

      private llvm::TrailingObjects<ObjCAtTryStmt, Stmt *> {

  friend TrailingObjects;

  size_t numTrailingObjects(OverloadToken<Stmt *>) const {

    return 1 + NumCatchStmts + HasFinally;

  }

  // The location of the @ in the \@try.

  SourceLocation AtTryLoc;

  // The number of catch blocks in this statement.

  unsigned NumCatchStmts : 16;

  // Whether this statement has a \@finally statement.

  bool HasFinally : 1;

  /// Retrieve the statements that are stored after this \@try statement.

  ///

  /// The order of the statements in memory follows the order in the source,

  /// with the \@try body first, followed by the \@catch statements (if any)

  /// and, finally, the \@finally (if it exists).

  Stmt **getStmts() { return getTrailingObjects<Stmt *>(); }

  Stmt *const *getStmts() const { return getTrailingObjects<Stmt *>(); }

  ObjCAtTryStmt(SourceLocation atTryLoc, Stmt *atTryStmt,

                Stmt **CatchStmts, unsigned NumCatchStmts,

                Stmt *atFinallyStmt);

  explicit ObjCAtTryStmt(EmptyShell Empty, unsigned NumCatchStmts,

                         bool HasFinally)

    : Stmt(ObjCAtTryStmtClass, Empty), NumCatchStmts(NumCatchStmts),

      HasFinally(HasFinally) { }

public:

  static ObjCAtTryStmt *Create(const ASTContext &Context,

                               SourceLocation atTryLoc, Stmt *atTryStmt,

                               Stmt **CatchStmts, unsigned NumCatchStmts,

                               Stmt *atFinallyStmt);

  static ObjCAtTryStmt *CreateEmpty(const ASTContext &Context,

                                    unsigned NumCatchStmts, bool HasFinally);

  /// Retrieve the location of the @ in the \@try.

  SourceLocation getAtTryLoc() const { return AtTryLoc; }

  void setAtTryLoc(SourceLocation Loc) { AtTryLoc = Loc; }

  /// Retrieve the \@try body.

  const Stmt *getTryBody() const { return getStmts()[0]; }

  Stmt *getTryBody() { return getStmts()[0]; }

  void setTryBody(Stmt *S) { getStmts()[0] = S; }

  /// Retrieve the number of \@catch statements in this try-catch-finally

  /// block.

  unsigned getNumCatchStmts() const { return NumCatchStmts; }

  /// Retrieve a \@catch statement.

  const ObjCAtCatchStmt *getCatchStmt(unsigned I) const {

    assert(I < NumCatchStmts && "Out-of-bounds @catch index");

    return cast_or_null<ObjCAtCatchStmt>(getStmts()[I + 1]);

  }

  /// Retrieve a \@catch statement.

  ObjCAtCatchStmt *getCatchStmt(unsigned I) {

    assert(I < NumCatchStmts && "Out-of-bounds @catch index");

    return cast_or_null<ObjCAtCatchStmt>(getStmts()[I + 1]);

  }

  /// Set a particular catch statement.

  void setCatchStmt(unsigned I, ObjCAtCatchStmt *S) {

    assert(I < NumCatchStmts && "Out-of-bounds @catch index");

    getStmts()[I + 1] = S;

  }

  /// Retrieve the \@finally statement, if any.

  const ObjCAtFinallyStmt *getFinallyStmt() const {

    if (!HasFinally)

      return nullptr;

    return cast_or_null<ObjCAtFinallyStmt>(getStmts()[1 + NumCatchStmts]);

  }

  ObjCAtFinallyStmt *getFinallyStmt() {

    if (!HasFinally)

      return nullptr;

    return cast_or_null<ObjCAtFinallyStmt>(getStmts()[1 + NumCatchStmts]);

  }

  void setFinallyStmt(Stmt *S) {

    assert(HasFinally && "@try does not have a @finally slot!");

    getStmts()[1 + NumCatchStmts] = S;

  }

  SourceLocation getBeginLoc() const LLVM_READONLY { return AtTryLoc; }

  SourceLocation getEndLoc() const LLVM_READONLY;

  static bool classof(const Stmt *T) {

    return T->getStmtClass() == ObjCAtTryStmtClass;

  }

  child_range children() {

    return child_range(

        getStmts(), getStmts() + numTrailingObjects(OverloadToken<Stmt *>()));

  }

  const_child_range children() const {

    return const_child_range(const_cast<ObjCAtTryStmt *>(this)->children());

  }

  using catch_stmt_iterator = CastIterator<ObjCAtCatchStmt>;

  using const_catch_stmt_iterator = ConstCastIterator<ObjCAtCatchStmt>;

  using catch_range = llvm::iterator_range<catch_stmt_iterator>;

  using catch_const_range = llvm::iterator_range<const_catch_stmt_iterator>;

  catch_stmt_iterator catch_stmts_begin() { return getStmts() + 1; }

  catch_stmt_iterator catch_stmts_end() {

    return catch_stmts_begin() + NumCatchStmts;

  }

  catch_range catch_stmts() {

    return catch_range(catch_stmts_begin(), catch_stmts_end());

  }

  const_catch_stmt_iterator catch_stmts_begin() const { return getStmts() + 1; }

  const_catch_stmt_iterator catch_stmts_end() const {

    return catch_stmts_begin() + NumCatchStmts;

  }

  catch_const_range catch_stmts() const {

    return catch_const_range(catch_stmts_begin(), catch_stmts_end());

  }

};

/// Represents Objective-C's \@synchronized statement.

///

/// Example:

/// \code

///   @synchronized (sem) {

///     do-something;

///   }

/// \endcode

class ObjCAtSynchronizedStmt : public Stmt {

private:

  SourceLocation AtSynchronizedLoc;

  enum { SYNC_EXPR, SYNC_BODY, END_EXPR };

  Stmt* SubStmts[END_EXPR];

public:

  ObjCAtSynchronizedStmt(SourceLocation atSynchronizedLoc, Stmt *synchExpr,

                         Stmt *synchBody)

  : Stmt(ObjCAtSynchronizedStmtClass) {

    SubStmts[SYNC_EXPR] = synchExpr;

    SubStmts[SYNC_BODY] = synchBody;

    AtSynchronizedLoc = atSynchronizedLoc;

  }

  explicit ObjCAtSynchronizedStmt(EmptyShell Empty) :

    Stmt(ObjCAtSynchronizedStmtClass, Empty) { }

  SourceLocation getAtSynchronizedLoc() const { return AtSynchronizedLoc; }

  void setAtSynchronizedLoc(SourceLocation Loc) { AtSynchronizedLoc = Loc; }

  const CompoundStmt *getSynchBody() const {

    return reinterpret_cast<CompoundStmt*>(SubStmts[SYNC_BODY]);

  }

  CompoundStmt *getSynchBody() {

    return reinterpret_cast<CompoundStmt*>(SubStmts[SYNC_BODY]);

  }

  void setSynchBody(Stmt *S) { SubStmts[SYNC_BODY] = S; }

  const Expr *getSynchExpr() const {

    return reinterpret_cast<Expr*>(SubStmts[SYNC_EXPR]);

  }

  Expr *getSynchExpr() {

    return reinterpret_cast<Expr*>(SubStmts[SYNC_EXPR]);

  }

  void setSynchExpr(Stmt *S) { SubStmts[SYNC_EXPR] = S; }

  SourceLocation getBeginLoc() const LLVM_READONLY { return AtSynchronizedLoc; }

  SourceLocation getEndLoc() const LLVM_READONLY {

    return getSynchBody()->getEndLoc();

  }

  static bool classof(const Stmt *T) {

    return T->getStmtClass() == ObjCAtSynchronizedStmtClass;

  }

  child_range children() {

    return child_range(&SubStmts[0], &SubStmts[0]+END_EXPR);

  }

  const_child_range children() const {

    return const_child_range(&SubStmts[0], &SubStmts[0] + END_EXPR);

  }

};

/// Represents Objective-C's \@throw statement.

class ObjCAtThrowStmt : public Stmt {

  SourceLocation AtThrowLoc;

  Stmt *Throw;

public:

  ObjCAtThrowStmt(SourceLocation atThrowLoc, Stmt *throwExpr)

  : Stmt(ObjCAtThrowStmtClass), Throw(throwExpr) {

    AtThrowLoc = atThrowLoc;

  }

  explicit ObjCAtThrowStmt(EmptyShell Empty) :

    Stmt(ObjCAtThrowStmtClass, Empty) { }

  const Expr *getThrowExpr() const { return reinterpret_cast<Expr*>(Throw); }

  Expr *getThrowExpr() { return reinterpret_cast<Expr*>(Throw); }

  void setThrowExpr(Stmt *S) { Throw = S; }

  SourceLocation getThrowLoc() const LLVM_READONLY { return AtThrowLoc; }

  void setThrowLoc(SourceLocation Loc) { AtThrowLoc = Loc; }

  SourceLocation getBeginLoc() const LLVM_READONLY { return AtThrowLoc; }

  SourceLocation getEndLoc() const LLVM_READONLY {

    return Throw ? Throw->getEndLoc() : AtThrowLoc;

  }

  static bool classof(const Stmt *T) {

    return T->getStmtClass() == ObjCAtThrowStmtClass;

  }

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

  const_child_range children() const {

    return const_child_range(&Throw, &Throw + 1);

  }

};

/// Represents Objective-C's \@autoreleasepool Statement

class ObjCAutoreleasePoolStmt : public Stmt {

  SourceLocation AtLoc;

  Stmt *SubStmt;

public:

  ObjCAutoreleasePoolStmt(SourceLocation atLoc, Stmt *subStmt)

      : Stmt(ObjCAutoreleasePoolStmtClass), AtLoc(atLoc), SubStmt(subStmt) {}

  explicit ObjCAutoreleasePoolStmt(EmptyShell Empty) :

    Stmt(ObjCAutoreleasePoolStmtClass, Empty) { }

  const Stmt *getSubStmt() const { return SubStmt; }

  Stmt *getSubStmt() { return SubStmt; }

  void setSubStmt(Stmt *S) { SubStmt = S; }

  SourceLocation getBeginLoc() const LLVM_READONLY { return AtLoc; }

  SourceLocation getEndLoc() const LLVM_READONLY {

    return SubStmt->getEndLoc();

  }

  SourceLocation getAtLoc() const { return AtLoc; }

  void setAtLoc(SourceLocation Loc) { AtLoc = Loc; }

  static bool classof(const Stmt *T) {

    return T->getStmtClass() == ObjCAutoreleasePoolStmtClass;

  }

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

  const_child_range children() const {

    return const_child_range(&SubStmt, &SubStmt + 1);

  }

};

}  // end namespace clang

#endif