clang/AST/Stmt.h

//===--- Stmt.h - Classes for representing statements -----------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file defines the Stmt interface and subclasses.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_AST_STMT_H
#define LLVM_CLANG_AST_STMT_H

#include "llvm/Support/Casting.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/AST/StmtIterator.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/iterator"
#include "llvm/Bitcode/SerializationFwd.h"
#include <iosfwd>

using llvm::dyn_cast_or_null;

namespace clang {
  class Expr;
  class Decl;
  class ScopedDecl;
  class IdentifierInfo;
  class SourceManager;
  class SwitchStmt;
  class PrinterHelper;

/// Stmt - This represents one statement.
///
class Stmt {
public:
  enum StmtClass {
#define STMT(N, CLASS, PARENT) CLASS##Class = N,
#define FIRST_STMT(N) firstStmtConstant = N,
#define LAST_STMT(N) lastStmtConstant = N,
#define FIRST_EXPR(N) firstExprConstant = N,
#define LAST_EXPR(N) lastExprConstant = N
#include "clang/AST/StmtNodes.def"
};
private:
  const StmtClass sClass;
public:
  Stmt(StmtClass SC) : sClass(SC) {
    if (Stmt::CollectingStats()) Stmt::addStmtClass(SC);
  }
  virtual ~Stmt() {}

  StmtClass getStmtClass() const { return sClass; }
  const char *getStmtClassName() const;

  /// SourceLocation tokens are not useful in isolation - they are low level
  /// value objects created/interpreted by SourceManager. We assume AST
  /// clients will have a pointer to the respective SourceManager.
  virtual SourceRange getSourceRange() const = 0;
  SourceLocation getLocStart() const { return getSourceRange().getBegin(); }
  SourceLocation getLocEnd() const { return getSourceRange().getEnd(); }

  // global temp stats (until we have a per-module visitor)
  static void addStmtClass(const StmtClass s);
  static bool CollectingStats(bool enable=false);
  static void PrintStats();

  /// dump - This does a local dump of the specified AST fragment.  It dumps the
  /// specified node and a few nodes underneath it, but not the whole subtree.
  /// This is useful in a debugger.
  void dump() const;
  void dump(SourceManager &SM) const;

  /// dumpAll - This does a dump of the specified AST fragment and all subtrees.
  void dumpAll() const;
  void dumpAll(SourceManager &SM) const;

  /// dumpPretty/printPretty - These two methods do a "pretty print" of the AST
  /// back to its original source language syntax.
  void dumpPretty() const;
  void printPretty(std::ostream &OS, PrinterHelper* = NULL) const;

  /// viewAST - Visualize an AST rooted at this Stmt* using GraphViz.  Only
  ///   works on systems with GraphViz (Mac OS X) or dot+gv installed.
  void viewAST() const;

  // Implement isa<T> support.
  static bool classof(const Stmt *) { return true; }

  /// hasImplicitControlFlow - Some statements (e.g. short circuited operations)
  ///  contain implicit control-flow in the order their subexpressions
  ///  are evaluated.  This predicate returns true if this statement has
  ///  such implicit control-flow.  Such statements are also specially handled
  ///  within CFGs.
  bool hasImplicitControlFlow() const;

  /// Child Iterators: All subclasses must implement child_begin and child_end
  ///  to permit easy iteration over the substatements/subexpessions of an
  ///  AST node.  This permits easy iteration over all nodes in the AST.
  typedef StmtIterator       child_iterator;
  typedef ConstStmtIterator  const_child_iterator;

  virtual child_iterator child_begin() = 0;
  virtual child_iterator child_end()   = 0;

  const_child_iterator child_begin() const {
    return const_child_iterator(const_cast<Stmt*>(this)->child_begin());
  }

  const_child_iterator child_end() const {
    return const_child_iterator(const_cast<Stmt*>(this)->child_end());
  }

  void Emit(llvm::Serializer& S) const;
  static Stmt* Materialize(llvm::Deserializer& D);

  virtual void directEmit(llvm::Serializer& S) const {
    // This method will eventually be a pure-virtual function.
    assert (false && "Not implemented.");
  }
};

/// DeclStmt - Adaptor class for mixing declarations with statements and
/// expressions. For example, CompoundStmt mixes statements, expressions
/// and declarations (variables, types). Another example is ForStmt, where
/// the first statement can be an expression or a declaration.
///
class DeclStmt : public Stmt {
  ScopedDecl *TheDecl;
public:
  DeclStmt(ScopedDecl *D) : Stmt(DeclStmtClass), TheDecl(D) {}

  const ScopedDecl *getDecl() const { return TheDecl; }
  ScopedDecl *getDecl() { return TheDecl; }

  virtual SourceRange getSourceRange() const { return SourceRange(); }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == DeclStmtClass;
  }
  static bool classof(const DeclStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static DeclStmt* directMaterialize(llvm::Deserializer& D);
};

/// NullStmt - This is the null statement ";": C99 6.8.3p3.
///
class NullStmt : public Stmt {
  SourceLocation SemiLoc;
public:
  NullStmt(SourceLocation L) : Stmt(NullStmtClass), SemiLoc(L) {}

  SourceLocation getSemiLoc() const { return SemiLoc; }

  virtual SourceRange getSourceRange() const { return SourceRange(SemiLoc); }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == NullStmtClass;
  }
  static bool classof(const NullStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static NullStmt* directMaterialize(llvm::Deserializer& D);
};

/// CompoundStmt - This represents a group of statements like { stmt stmt }.
///
class CompoundStmt : public Stmt {
  llvm::SmallVector<Stmt*, 16> Body;
  SourceLocation LBracLoc, RBracLoc;
public:
  CompoundStmt(Stmt **StmtStart, unsigned NumStmts,
               SourceLocation LB, SourceLocation RB)
    : Stmt(CompoundStmtClass), Body(StmtStart, StmtStart+NumStmts),
      LBracLoc(LB), RBracLoc(RB) {}

  bool body_empty() const { return Body.empty(); }

  typedef llvm::SmallVector<Stmt*, 16>::iterator body_iterator;
  body_iterator body_begin() { return Body.begin(); }
  body_iterator body_end() { return Body.end(); }
  Stmt *body_back() { return Body.back(); }

  typedef llvm::SmallVector<Stmt*, 16>::const_iterator const_body_iterator;
  const_body_iterator body_begin() const { return Body.begin(); }
  const_body_iterator body_end() const { return Body.end(); }
  const Stmt *body_back() const { return Body.back(); }

  typedef llvm::SmallVector<Stmt*, 16>::reverse_iterator reverse_body_iterator;
  reverse_body_iterator body_rbegin() { return Body.rbegin(); }
  reverse_body_iterator body_rend() { return Body.rend(); }

  typedef llvm::SmallVector<Stmt*, 16>::const_reverse_iterator
    const_reverse_body_iterator;
  const_reverse_body_iterator body_rbegin() const { return Body.rbegin(); }
  const_reverse_body_iterator body_rend() const { return Body.rend(); }

  void push_back(Stmt *S) { Body.push_back(S); }

  virtual SourceRange getSourceRange() const {
    return SourceRange(LBracLoc, RBracLoc);
  }

  SourceLocation getLBracLoc() const { return LBracLoc; }
  SourceLocation getRBracLoc() const { return RBracLoc; }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == CompoundStmtClass;
  }
  static bool classof(const CompoundStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static CompoundStmt* directMaterialize(llvm::Deserializer& D);
};

// SwitchCase is the base class for CaseStmt and DefaultStmt,
class SwitchCase : public Stmt {
  // A pointer to the following CaseStmt or DefaultStmt class,
  // used by SwitchStmt.
  SwitchCase *NextSwitchCase;
protected:
  SwitchCase(StmtClass SC) : Stmt(SC), NextSwitchCase(0) {}

public:
  const SwitchCase *getNextSwitchCase() const { return NextSwitchCase; }

  SwitchCase *getNextSwitchCase() { return NextSwitchCase; }

  void setNextSwitchCase(SwitchCase *SC) { NextSwitchCase = SC; }

  virtual Stmt* v_getSubStmt() = 0;
  Stmt *getSubStmt() { return v_getSubStmt(); }

  virtual SourceRange getSourceRange() const { return SourceRange(); }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == CaseStmtClass ||
    T->getStmtClass() == DefaultStmtClass;
  }
  static bool classof(const SwitchCase *) { return true; }
};

class CaseStmt : public SwitchCase {
  enum { SUBSTMT, LHS, RHS, END_EXPR };
  Stmt* SubExprs[END_EXPR];  // The expression for the RHS is Non-null for
                             // GNU "case 1 ... 4" extension
  SourceLocation CaseLoc;
public:
  CaseStmt(Expr *lhs, Expr *rhs, Stmt *substmt, SourceLocation caseLoc)
    : SwitchCase(CaseStmtClass) {
    SubExprs[SUBSTMT] = substmt;
    SubExprs[LHS] = reinterpret_cast<Stmt*>(lhs);
    SubExprs[RHS] = reinterpret_cast<Stmt*>(rhs);
    CaseLoc = caseLoc;
  }

  SourceLocation getCaseLoc() const { return CaseLoc; }

  Expr *getLHS() { return reinterpret_cast<Expr*>(SubExprs[LHS]); }
  Expr *getRHS() { return reinterpret_cast<Expr*>(SubExprs[RHS]); }
  Stmt *getSubStmt() { return SubExprs[SUBSTMT]; }
  virtual Stmt* v_getSubStmt() { return getSubStmt(); }
  const Expr *getLHS() const {
    return reinterpret_cast<const Expr*>(SubExprs[LHS]);
  }
  const Expr *getRHS() const {
    return reinterpret_cast<const Expr*>(SubExprs[RHS]);
  }
  const Stmt *getSubStmt() const { return SubExprs[SUBSTMT]; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(CaseLoc, SubExprs[SUBSTMT]->getLocEnd());
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == CaseStmtClass;
  }
  static bool classof(const CaseStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static CaseStmt* directMaterialize(llvm::Deserializer& D);
};

class DefaultStmt : public SwitchCase {
  Stmt* SubStmt;
  SourceLocation DefaultLoc;
public:
  DefaultStmt(SourceLocation DL, Stmt *substmt) :
    SwitchCase(DefaultStmtClass), SubStmt(substmt), DefaultLoc(DL) {}

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

  SourceLocation getDefaultLoc() const { return DefaultLoc; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(DefaultLoc, SubStmt->getLocEnd());
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == DefaultStmtClass;
  }
  static bool classof(const DefaultStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static DefaultStmt* directMaterialize(llvm::Deserializer& D);
};

class LabelStmt : public Stmt {
  IdentifierInfo *Label;
  Stmt *SubStmt;
  SourceLocation IdentLoc;
public:
  LabelStmt(SourceLocation IL, IdentifierInfo *label, Stmt *substmt)
    : Stmt(LabelStmtClass), Label(label),
      SubStmt(substmt), IdentLoc(IL) {}

  SourceLocation getIdentLoc() const { return IdentLoc; }
  IdentifierInfo *getID() const { return Label; }
  const char *getName() const;
  Stmt *getSubStmt() { return SubStmt; }
  const Stmt *getSubStmt() const { return SubStmt; }

  void setIdentLoc(SourceLocation L) { IdentLoc = L; }
  void setSubStmt(Stmt *SS) { SubStmt = SS; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(IdentLoc, SubStmt->getLocEnd());
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == LabelStmtClass;
  }
  static bool classof(const LabelStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static LabelStmt* directMaterialize(llvm::Deserializer& D);
};


/// IfStmt - This represents an if/then/else.
///
class IfStmt : public Stmt {
  enum { COND, THEN, ELSE, END_EXPR };
  Stmt* SubExprs[END_EXPR];
  SourceLocation IfLoc;
public:
  IfStmt(SourceLocation IL, Expr *cond, Stmt *then, Stmt *elsev = 0)
    : Stmt(IfStmtClass)  {
    SubExprs[COND] = reinterpret_cast<Stmt*>(cond);
    SubExprs[THEN] = then;
    SubExprs[ELSE] = elsev;
    IfLoc = IL;
  }

  const Expr *getCond() const { return reinterpret_cast<Expr*>(SubExprs[COND]);}
  const Stmt *getThen() const { return SubExprs[THEN]; }
  const Stmt *getElse() const { return SubExprs[ELSE]; }

  Expr *getCond() { return reinterpret_cast<Expr*>(SubExprs[COND]); }
  Stmt *getThen() { return SubExprs[THEN]; }
  Stmt *getElse() { return SubExprs[ELSE]; }

  virtual SourceRange getSourceRange() const {
    if (SubExprs[ELSE])
      return SourceRange(IfLoc, SubExprs[ELSE]->getLocEnd());
    else
      return SourceRange(IfLoc, SubExprs[THEN]->getLocEnd());
  }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == IfStmtClass;
  }
  static bool classof(const IfStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static IfStmt* directMaterialize(llvm::Deserializer& D);
};

/// SwitchStmt - This represents a 'switch' stmt.
///
class SwitchStmt : public Stmt {
  enum { COND, BODY, END_EXPR };
  Stmt* SubExprs[END_EXPR];
  // This points to a linked list of case and default statements.
  SwitchCase *FirstCase;
  SourceLocation SwitchLoc;
public:
  SwitchStmt(Expr *cond) : Stmt(SwitchStmtClass), FirstCase(0) {
      SubExprs[COND] = reinterpret_cast<Stmt*>(cond);
      SubExprs[BODY] = NULL;
    }

  const Expr *getCond() const { return reinterpret_cast<Expr*>(SubExprs[COND]);}
  const Stmt *getBody() const { return SubExprs[BODY]; }
  const SwitchCase *getSwitchCaseList() const { return FirstCase; }

  Expr *getCond() { return reinterpret_cast<Expr*>(SubExprs[COND]);}
  Stmt *getBody() { return SubExprs[BODY]; }
  SwitchCase *getSwitchCaseList() { return FirstCase; }

  void setBody(Stmt *S, SourceLocation SL) {
    SubExprs[BODY] = S;
    SwitchLoc = SL;
  }
  void addSwitchCase(SwitchCase *SC) {
    if (FirstCase)
      SC->setNextSwitchCase(FirstCase);

    FirstCase = SC;
  }
  virtual SourceRange getSourceRange() const {
    return SourceRange(SwitchLoc, SubExprs[BODY]->getLocEnd());
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == SwitchStmtClass;
  }
  static bool classof(const SwitchStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static SwitchStmt* directMaterialize(llvm::Deserializer& D);
};


/// WhileStmt - This represents a 'while' stmt.
///
class WhileStmt : public Stmt {
  enum { COND, BODY, END_EXPR };
  Stmt* SubExprs[END_EXPR];
  SourceLocation WhileLoc;
public:
  WhileStmt(Expr *cond, Stmt *body, SourceLocation WL) : Stmt(WhileStmtClass) {
    SubExprs[COND] = reinterpret_cast<Stmt*>(cond);
    SubExprs[BODY] = body;
    WhileLoc = WL;
  }

  Expr *getCond() { return reinterpret_cast<Expr*>(SubExprs[COND]); }
  const Expr *getCond() const { return reinterpret_cast<Expr*>(SubExprs[COND]);}
  Stmt *getBody() { return SubExprs[BODY]; }
  const Stmt *getBody() const { return SubExprs[BODY]; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(WhileLoc, SubExprs[BODY]->getLocEnd());
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == WhileStmtClass;
  }
  static bool classof(const WhileStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static WhileStmt* directMaterialize(llvm::Deserializer& D);
};

/// DoStmt - This represents a 'do/while' stmt.
///
class DoStmt : public Stmt {
  enum { COND, BODY, END_EXPR };
  Stmt* SubExprs[END_EXPR];
  SourceLocation DoLoc;
public:
  DoStmt(Stmt *body, Expr *cond, SourceLocation DL)
    : Stmt(DoStmtClass), DoLoc(DL) {
    SubExprs[COND] = reinterpret_cast<Stmt*>(cond);
    SubExprs[BODY] = body;
    DoLoc = DL;
  }

  Expr *getCond() { return reinterpret_cast<Expr*>(SubExprs[COND]); }
  const Expr *getCond() const { return reinterpret_cast<Expr*>(SubExprs[COND]);}
  Stmt *getBody() { return SubExprs[BODY]; }
  const Stmt *getBody() const { return SubExprs[BODY]; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(DoLoc, SubExprs[BODY]->getLocEnd());
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == DoStmtClass;
  }
  static bool classof(const DoStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();
};


/// ForStmt - This represents a 'for (init;cond;inc)' stmt.  Note that any of
/// the init/cond/inc parts of the ForStmt will be null if they were not
/// specified in the source.
///
class ForStmt : public Stmt {
  enum { INIT, COND, INC, BODY, END_EXPR };
  Stmt* SubExprs[END_EXPR]; // SubExprs[INIT] is an expression or declstmt.
  SourceLocation ForLoc;
public:
  ForStmt(Stmt *Init, Expr *Cond, Expr *Inc, Stmt *Body, SourceLocation FL)
    : Stmt(ForStmtClass) {
    SubExprs[INIT] = Init;
    SubExprs[COND] = reinterpret_cast<Stmt*>(Cond);
    SubExprs[INC] = reinterpret_cast<Stmt*>(Inc);
    SubExprs[BODY] = Body;
    ForLoc = FL;
  }

  Stmt *getInit() { return SubExprs[INIT]; }
  Expr *getCond() { return reinterpret_cast<Expr*>(SubExprs[COND]); }
  Expr *getInc()  { return reinterpret_cast<Expr*>(SubExprs[INC]); }
  Stmt *getBody() { return SubExprs[BODY]; }

  const Stmt *getInit() const { return SubExprs[INIT]; }
  const Expr *getCond() const { return reinterpret_cast<Expr*>(SubExprs[COND]);}
  const Expr *getInc()  const { return reinterpret_cast<Expr*>(SubExprs[INC]); }
  const Stmt *getBody() const { return SubExprs[BODY]; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(ForLoc, SubExprs[BODY]->getLocEnd());
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == ForStmtClass;
  }
  static bool classof(const ForStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();
};

/// GotoStmt - This represents a direct goto.
///
class GotoStmt : public Stmt {
  LabelStmt *Label;
  SourceLocation GotoLoc;
  SourceLocation LabelLoc;
public:
  GotoStmt(LabelStmt *label, SourceLocation GL, SourceLocation LL)
    : Stmt(GotoStmtClass), Label(label), GotoLoc(GL), LabelLoc(LL) {}

  LabelStmt *getLabel() const { return Label; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(GotoLoc, LabelLoc);
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == GotoStmtClass;
  }
  static bool classof(const GotoStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();
};

/// IndirectGotoStmt - This represents an indirect goto.
///
class IndirectGotoStmt : public Stmt {
  Expr *Target;
public:
  IndirectGotoStmt(Expr *target) : Stmt(IndirectGotoStmtClass), Target(target){}

  Expr *getTarget() { return Target; }
  const Expr *getTarget() const { return Target; }

  virtual SourceRange getSourceRange() const { return SourceRange(); }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == IndirectGotoStmtClass;
  }
  static bool classof(const IndirectGotoStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();
};


/// ContinueStmt - This represents a continue.
///
class ContinueStmt : public Stmt {
  SourceLocation ContinueLoc;
public:
  ContinueStmt(SourceLocation CL) : Stmt(ContinueStmtClass), ContinueLoc(CL) {}

  virtual SourceRange getSourceRange() const {
    return SourceRange(ContinueLoc);
  }
  static bool classof(const Stmt *T) {
    return T->getStmtClass() == ContinueStmtClass;
  }
  static bool classof(const ContinueStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();
};

/// BreakStmt - This represents a break.
///
class BreakStmt : public Stmt {
  SourceLocation BreakLoc;
public:
  BreakStmt(SourceLocation BL) : Stmt(BreakStmtClass), BreakLoc(BL) {}

  virtual SourceRange getSourceRange() const { return SourceRange(BreakLoc); }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == BreakStmtClass;
  }
  static bool classof(const BreakStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static BreakStmt* directMaterialize(llvm::Deserializer& D);
};


/// ReturnStmt - This represents a return, optionally of an expression.
///
class ReturnStmt : public Stmt {
  Expr *RetExpr;
  SourceLocation RetLoc;
public:
  ReturnStmt(SourceLocation RL, Expr *E = 0) : Stmt(ReturnStmtClass),
    RetExpr(E), RetLoc(RL) {}

  const Expr *getRetValue() const { return RetExpr; }
  Expr *getRetValue() { return RetExpr; }

  virtual SourceRange getSourceRange() const;

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == ReturnStmtClass;
  }
  static bool classof(const ReturnStmt *) { return true; }

  // Iterators
  virtual child_iterator child_begin();
  virtual child_iterator child_end();

  virtual void directEmit(llvm::Serializer& S) const;
  static ReturnStmt* directMaterialize(llvm::Deserializer& D);
};

/// AsmStmt - This represents a GNU inline-assembly statement extension.
///
class AsmStmt : public Stmt {
  SourceLocation AsmLoc, RParenLoc;
  // FIXME: This doesn't capture most of the interesting pieces.
public:
  AsmStmt(SourceLocation asmloc, SourceLocation rparenloc)
    : Stmt(AsmStmtClass), AsmLoc(asmloc), RParenLoc(rparenloc) {}

  virtual SourceRange getSourceRange() const {
    return SourceRange(AsmLoc, RParenLoc);
  }

  static bool classof(const Stmt *T) {return T->getStmtClass() == AsmStmtClass;}
  static bool classof(const AsmStmt *) { return true; }

  virtual child_iterator child_begin();
  virtual child_iterator child_end();
};

/// ObjcAtCatchStmt - This represents objective-c's @catch statement.
class ObjcAtCatchStmt : public Stmt {
private:
  // Points to next @catch statement, or null
  ObjcAtCatchStmt *NextAtCatchStmt;
  enum { SELECTOR, BODY, END_EXPR };
  Stmt *SubExprs[END_EXPR];
  SourceLocation AtCatchLoc, RParenLoc;

public:
  ObjcAtCatchStmt(SourceLocation atCatchLoc, SourceLocation rparenloc,
                  Stmt *catchVarStmtDecl, Stmt *atCatchStmt, Stmt *atCatchList)
  : Stmt(ObjcAtCatchStmtClass) {
      SubExprs[SELECTOR] = catchVarStmtDecl;
      SubExprs[BODY] = atCatchStmt;
      SubExprs[END_EXPR] = NULL;
      if (!atCatchList)
        NextAtCatchStmt = NULL;
      else {
        ObjcAtCatchStmt *AtCatchList =
          static_cast<ObjcAtCatchStmt*>(atCatchList);
        while (AtCatchList->NextAtCatchStmt)
          AtCatchList = AtCatchList->NextAtCatchStmt;
        AtCatchList->NextAtCatchStmt = this;
      }
      AtCatchLoc = atCatchLoc;
      RParenLoc = rparenloc;
    }

  const Stmt *getCatchBody() const { return SubExprs[BODY]; }
  Stmt *getCatchBody() { return SubExprs[BODY]; }
  const ObjcAtCatchStmt *getNextCatchStmt() const { return NextAtCatchStmt; }
  ObjcAtCatchStmt *getNextCatchStmt() { return NextAtCatchStmt; }
  const Stmt *getCatchParamStmt() const { return SubExprs[SELECTOR]; }
  Stmt *getCatchParamStmt() { return SubExprs[SELECTOR]; }

  SourceLocation getRParenLoc() const { return RParenLoc; }

  virtual SourceRange getSourceRange() const {
    return SourceRange(AtCatchLoc, SubExprs[BODY]->getLocEnd());
  }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == ObjcAtCatchStmtClass;
  }
  static bool classof(const ObjcAtCatchStmt *) { return true; }

  virtual child_iterator child_begin();
  virtual child_iterator child_end();

};

/// ObjcAtFinallyStmt - This represent objective-c's @finally Statement
class ObjcAtFinallyStmt : public Stmt {
  private:
    Stmt *AtFinallyStmt;
    SourceLocation AtFinallyLoc;

  public:
    ObjcAtFinallyStmt(SourceLocation atFinallyLoc, Stmt *atFinallyStmt)
    : Stmt(ObjcAtFinallyStmtClass),
      AtFinallyStmt(atFinallyStmt), AtFinallyLoc(atFinallyLoc) {}

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

    virtual SourceRange getSourceRange() const {
      return SourceRange(AtFinallyLoc, AtFinallyStmt->getLocEnd());
    }

    static bool classof(const Stmt *T) {
      return T->getStmtClass() == ObjcAtFinallyStmtClass;
    }
    static bool classof(const ObjcAtFinallyStmt *) { return true; }

    virtual child_iterator child_begin();
    virtual child_iterator child_end();

};

/// ObjcAtTryStmt - This represent objective-c's over-all
/// @try ... @catch ... @finally statement.
class ObjcAtTryStmt : public Stmt {
private:
  enum { TRY, CATCH, FINALLY, END_TRY };
  Stmt* SubStmts[END_TRY];

  SourceLocation AtTryLoc;

public:
  ObjcAtTryStmt(SourceLocation atTryLoc, Stmt *atTryStmt,
                Stmt *atCatchStmt,
                Stmt *atFinallyStmt)
  : Stmt(ObjcAtTryStmtClass) {
      SubStmts[TRY] = atTryStmt;
      SubStmts[CATCH] = atCatchStmt;
      SubStmts[FINALLY] = atFinallyStmt;
      SubStmts[END_TRY] = NULL;
      AtTryLoc = atTryLoc;
    }

  const Stmt *getTryBody() const { return SubStmts[TRY]; }
  Stmt *getTryBody() { return SubStmts[TRY]; }
  const ObjcAtCatchStmt *getCatchStmts() const {
    return dyn_cast_or_null<ObjcAtCatchStmt>(SubStmts[CATCH]);
  }
  ObjcAtCatchStmt *getCatchStmts() {
    return dyn_cast_or_null<ObjcAtCatchStmt>(SubStmts[CATCH]);
  }
  const ObjcAtFinallyStmt *getFinallyStmt() const {
    return dyn_cast_or_null<ObjcAtFinallyStmt>(SubStmts[FINALLY]);
  }
  ObjcAtFinallyStmt *getFinallyStmt() {
    return dyn_cast_or_null<ObjcAtFinallyStmt>(SubStmts[FINALLY]);
  }
  virtual SourceRange getSourceRange() const {
    return SourceRange(AtTryLoc, SubStmts[TRY]->getLocEnd());
  }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == ObjcAtTryStmtClass;
  }
  static bool classof(const ObjcAtTryStmt *) { return true; }

  virtual child_iterator child_begin();
  virtual child_iterator child_end();

};

/// ObjcAtThrowStmt - This represents objective-c's @throw statement.
class ObjcAtThrowStmt : public Stmt {
private:
  Stmt *Throw;
  SourceLocation AtThrowLoc;

public:
  ObjcAtThrowStmt(SourceLocation atThrowLoc, Stmt *throwExpr)
  : Stmt(ObjcAtThrowStmtClass), Throw(throwExpr) {
    AtThrowLoc = atThrowLoc;
  }

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

  virtual SourceRange getSourceRange() const {
    return SourceRange(AtThrowLoc, Throw->getLocEnd());
  }

  static bool classof(const Stmt *T) {
    return T->getStmtClass() == ObjcAtThrowStmtClass;
  }
  static bool classof(const ObjcAtThrowStmt *) { return true; }

  virtual child_iterator child_begin();
  virtual child_iterator child_end();
};

}  // end namespace clang

#endif