lib/AST/StmtPrinter.cpp

//===--- StmtPrinter.cpp - Printing implementation for Stmt ASTs ----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Stmt::dumpPretty/Stmt::printPretty methods, which
// pretty print the AST back out to C code.
//
//===----------------------------------------------------------------------===//

#include "clang/AST/StmtVisitor.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/PrettyPrinter.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Format.h"
using namespace clang;

//===----------------------------------------------------------------------===//
// StmtPrinter Visitor
//===----------------------------------------------------------------------===//

namespace  {
  class VISIBILITY_HIDDEN StmtPrinter : public StmtVisitor<StmtPrinter> {
    llvm::raw_ostream &OS;
    ASTContext &Context;
    unsigned IndentLevel;
    clang::PrinterHelper* Helper;
    PrintingPolicy Policy;

  public:
    StmtPrinter(llvm::raw_ostream &os, ASTContext &C, PrinterHelper* helper, 
                const PrintingPolicy &Policy,
                unsigned Indentation = 0)
      : OS(os), Context(C), IndentLevel(Indentation), Helper(helper),
        Policy(Policy) {}
    
    void PrintStmt(Stmt *S) {
      PrintStmt(S, Policy.Indentation);
    }

    void PrintStmt(Stmt *S, int SubIndent) {
      IndentLevel += SubIndent;
      if (S && isa<Expr>(S)) {
        // If this is an expr used in a stmt context, indent and newline it.
        Indent();
        Visit(S);
        OS << ";\n";
      } else if (S) {
        Visit(S);
      } else {
        Indent() << "<<<NULL STATEMENT>>>\n";
      }
      IndentLevel -= SubIndent;
    }

    void PrintRawCompoundStmt(CompoundStmt *S);
    void PrintRawDecl(Decl *D);
    void PrintRawDeclStmt(DeclStmt *S);
    void PrintRawIfStmt(IfStmt *If);
    void PrintRawCXXCatchStmt(CXXCatchStmt *Catch);
    
    void PrintExpr(Expr *E) {
      if (E)
        Visit(E);
      else
        OS << "<null expr>";
    }
    
    llvm::raw_ostream &Indent(int Delta = 0) {
      for (int i = 0, e = IndentLevel+Delta; i < e; ++i)
        OS << "  ";
      return OS;
    }
    
    bool PrintOffsetOfDesignator(Expr *E);
    void VisitUnaryOffsetOf(UnaryOperator *Node);
    
    void Visit(Stmt* S) {    
      if (Helper && Helper->handledStmt(S,OS))
          return;
      else StmtVisitor<StmtPrinter>::Visit(S);
    }
    
    void VisitStmt(Stmt *Node);
#define STMT(CLASS, PARENT) \
    void Visit##CLASS(CLASS *Node);
#include "clang/AST/StmtNodes.def"
  };
}

//===----------------------------------------------------------------------===//
//  Stmt printing methods.
//===----------------------------------------------------------------------===//

void StmtPrinter::VisitStmt(Stmt *Node) {
  Indent() << "<<unknown stmt type>>\n";
}

/// PrintRawCompoundStmt - Print a compound stmt without indenting the {, and
/// with no newline after the }.
void StmtPrinter::PrintRawCompoundStmt(CompoundStmt *Node) {
  OS << "{\n";
  for (CompoundStmt::body_iterator I = Node->body_begin(), E = Node->body_end();
       I != E; ++I)
    PrintStmt(*I);
  
  Indent() << "}";
}

void StmtPrinter::PrintRawDecl(Decl *D) {
  D->print(OS, Policy, IndentLevel);
}

void StmtPrinter::PrintRawDeclStmt(DeclStmt *S) {
  DeclStmt::decl_iterator Begin = S->decl_begin(), End = S->decl_end();
  llvm::SmallVector<Decl*, 2> Decls;
  for ( ; Begin != End; ++Begin) 
    Decls.push_back(*Begin);

  Decl::printGroup(Decls.data(), Decls.size(), OS, Policy, IndentLevel);
}

void StmtPrinter::VisitNullStmt(NullStmt *Node) {
  Indent() << ";\n";
}

void StmtPrinter::VisitDeclStmt(DeclStmt *Node) {
  Indent();
  PrintRawDeclStmt(Node);
  OS << ";\n";
}

void StmtPrinter::VisitCompoundStmt(CompoundStmt *Node) {
  Indent();
  PrintRawCompoundStmt(Node);
  OS << "\n";
}

void StmtPrinter::VisitCaseStmt(CaseStmt *Node) {
  Indent(-1) << "case ";
  PrintExpr(Node->getLHS());
  if (Node->getRHS()) {
    OS << " ... ";
    PrintExpr(Node->getRHS());
  }
  OS << ":\n";
  
  PrintStmt(Node->getSubStmt(), 0);
}

void StmtPrinter::VisitDefaultStmt(DefaultStmt *Node) {
  Indent(-1) << "default:\n";
  PrintStmt(Node->getSubStmt(), 0);
}

void StmtPrinter::VisitLabelStmt(LabelStmt *Node) {
  Indent(-1) << Node->getName() << ":\n";
  PrintStmt(Node->getSubStmt(), 0);
}

void StmtPrinter::PrintRawIfStmt(IfStmt *If) {
  OS << "if (";
  PrintExpr(If->getCond());
  OS << ')';
  
  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(If->getThen())) {
    OS << ' ';
    PrintRawCompoundStmt(CS);
    OS << (If->getElse() ? ' ' : '\n');
  } else {
    OS << '\n';
    PrintStmt(If->getThen());
    if (If->getElse()) Indent();
  }
  
  if (Stmt *Else = If->getElse()) {
    OS << "else";
    
    if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Else)) {
      OS << ' ';
      PrintRawCompoundStmt(CS);
      OS << '\n';
    } else if (IfStmt *ElseIf = dyn_cast<IfStmt>(Else)) {
      OS << ' ';
      PrintRawIfStmt(ElseIf);
    } else {
      OS << '\n';
      PrintStmt(If->getElse());
    }
  }
}

void StmtPrinter::VisitIfStmt(IfStmt *If) {
  Indent();
  PrintRawIfStmt(If);
}

void StmtPrinter::VisitSwitchStmt(SwitchStmt *Node) {
  Indent() << "switch (";
  PrintExpr(Node->getCond());
  OS << ")";
  
  // Pretty print compoundstmt bodies (very common).
  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
    OS << " ";
    PrintRawCompoundStmt(CS);
    OS << "\n";
  } else {
    OS << "\n";
    PrintStmt(Node->getBody());
  }
}

void StmtPrinter::VisitSwitchCase(SwitchCase*) {
  assert(0 && "SwitchCase is an abstract class");
}

void StmtPrinter::VisitWhileStmt(WhileStmt *Node) {
  Indent() << "while (";
  PrintExpr(Node->getCond());
  OS << ")\n";
  PrintStmt(Node->getBody());
}

void StmtPrinter::VisitDoStmt(DoStmt *Node) {
  Indent() << "do ";
  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
    PrintRawCompoundStmt(CS);
    OS << " ";
  } else {
    OS << "\n";
    PrintStmt(Node->getBody());
    Indent();
  }
  
  OS << "while (";
  PrintExpr(Node->getCond());
  OS << ");\n";
}

void StmtPrinter::VisitForStmt(ForStmt *Node) {
  Indent() << "for (";
  if (Node->getInit()) {
    if (DeclStmt *DS = dyn_cast<DeclStmt>(Node->getInit()))
      PrintRawDeclStmt(DS);
    else
      PrintExpr(cast<Expr>(Node->getInit()));
  }
  OS << ";";
  if (Node->getCond()) {
    OS << " ";
    PrintExpr(Node->getCond());
  }
  OS << ";";
  if (Node->getInc()) {
    OS << " ";
    PrintExpr(Node->getInc());
  }
  OS << ") ";
  
  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
    PrintRawCompoundStmt(CS);
    OS << "\n";
  } else {
    OS << "\n";
    PrintStmt(Node->getBody());
  }
}

void StmtPrinter::VisitObjCForCollectionStmt(ObjCForCollectionStmt *Node) {
  Indent() << "for (";
  if (DeclStmt *DS = dyn_cast<DeclStmt>(Node->getElement()))
    PrintRawDeclStmt(DS);
  else
    PrintExpr(cast<Expr>(Node->getElement()));
  OS << " in ";
  PrintExpr(Node->getCollection());
  OS << ") ";
  
  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
    PrintRawCompoundStmt(CS);
    OS << "\n";
  } else {
    OS << "\n";
    PrintStmt(Node->getBody());
  }
}

void StmtPrinter::VisitGotoStmt(GotoStmt *Node) {
  Indent() << "goto " << Node->getLabel()->getName() << ";\n";
}

void StmtPrinter::VisitIndirectGotoStmt(IndirectGotoStmt *Node) {
  Indent() << "goto *";
  PrintExpr(Node->getTarget());
  OS << ";\n";
}

void StmtPrinter::VisitContinueStmt(ContinueStmt *Node) {
  Indent() << "continue;\n";
}

void StmtPrinter::VisitBreakStmt(BreakStmt *Node) {
  Indent() << "break;\n";
}


void StmtPrinter::VisitReturnStmt(ReturnStmt *Node) {
  Indent() << "return";
  if (Node->getRetValue()) {
    OS << " ";
    PrintExpr(Node->getRetValue());
  }
  OS << ";\n";
}


void StmtPrinter::VisitAsmStmt(AsmStmt *Node) {
  Indent() << "asm ";
  
  if (Node->isVolatile())
    OS << "volatile ";
  
  OS << "(";
  VisitStringLiteral(Node->getAsmString());
  
  // Outputs
  if (Node->getNumOutputs() != 0 || Node->getNumInputs() != 0 ||
      Node->getNumClobbers() != 0)
    OS << " : ";
  
  for (unsigned i = 0, e = Node->getNumOutputs(); i != e; ++i) {
    if (i != 0)
      OS << ", ";
    
    if (!Node->getOutputName(i).empty()) {
      OS << '[';
      OS << Node->getOutputName(i);
      OS << "] ";
    }
    
    VisitStringLiteral(Node->getOutputConstraintLiteral(i));
    OS << " ";
    Visit(Node->getOutputExpr(i));
  }
  
  // Inputs
  if (Node->getNumInputs() != 0 || Node->getNumClobbers() != 0)
    OS << " : ";
  
  for (unsigned i = 0, e = Node->getNumInputs(); i != e; ++i) {
    if (i != 0)
      OS << ", ";
    
    if (!Node->getInputName(i).empty()) {
      OS << '[';
      OS << Node->getInputName(i);
      OS << "] ";
    }
    
    VisitStringLiteral(Node->getInputConstraintLiteral(i));
    OS << " ";
    Visit(Node->getInputExpr(i));
  }
  
  // Clobbers
  if (Node->getNumClobbers() != 0)
    OS << " : ";
    
  for (unsigned i = 0, e = Node->getNumClobbers(); i != e; ++i) {
    if (i != 0)
      OS << ", ";
      
    VisitStringLiteral(Node->getClobber(i));
  }
  
  OS << ");\n";
}

void StmtPrinter::VisitObjCAtTryStmt(ObjCAtTryStmt *Node) {
  Indent() << "@try";
  if (CompoundStmt *TS = dyn_cast<CompoundStmt>(Node->getTryBody())) {
    PrintRawCompoundStmt(TS);
    OS << "\n";
  }
  
  for (ObjCAtCatchStmt *catchStmt = 
         static_cast<ObjCAtCatchStmt *>(Node->getCatchStmts());
       catchStmt; 
       catchStmt = 
         static_cast<ObjCAtCatchStmt *>(catchStmt->getNextCatchStmt())) {
    Indent() << "@catch(";
    if (catchStmt->getCatchParamDecl()) {
      if (Decl *DS = catchStmt->getCatchParamDecl())
        PrintRawDecl(DS);
    }
    OS << ")";
    if (CompoundStmt *CS = dyn_cast<CompoundStmt>(catchStmt->getCatchBody())) 
      {
        PrintRawCompoundStmt(CS);
        OS << "\n";
      } 
  }
  
  if (ObjCAtFinallyStmt *FS =static_cast<ObjCAtFinallyStmt *>(
          Node->getFinallyStmt())) {
    Indent() << "@finally";
    PrintRawCompoundStmt(dyn_cast<CompoundStmt>(FS->getFinallyBody()));
    OS << "\n";
  }  
}

void StmtPrinter::VisitObjCAtFinallyStmt(ObjCAtFinallyStmt *Node) {
}

void StmtPrinter::VisitObjCAtCatchStmt (ObjCAtCatchStmt *Node) {
  Indent() << "@catch (...) { /* todo */ } \n";
}

void StmtPrinter::VisitObjCAtThrowStmt(ObjCAtThrowStmt *Node) {
  Indent() << "@throw";
  if (Node->getThrowExpr()) {
    OS << " ";
    PrintExpr(Node->getThrowExpr());
  }
  OS << ";\n";
}

void StmtPrinter::VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *Node) {
  Indent() << "@synchronized (";
  PrintExpr(Node->getSynchExpr());
  OS << ")";
  PrintRawCompoundStmt(Node->getSynchBody());
  OS << "\n";
}

void StmtPrinter::PrintRawCXXCatchStmt(CXXCatchStmt *Node) {
  OS << "catch (";
  if (Decl *ExDecl = Node->getExceptionDecl())
    PrintRawDecl(ExDecl);
  else
    OS << "...";
  OS << ") ";
  PrintRawCompoundStmt(cast<CompoundStmt>(Node->getHandlerBlock()));
}

void StmtPrinter::VisitCXXCatchStmt(CXXCatchStmt *Node) {
  Indent();
  PrintRawCXXCatchStmt(Node);
  OS << "\n";
}

void StmtPrinter::VisitCXXTryStmt(CXXTryStmt *Node) {
  Indent() << "try ";
  PrintRawCompoundStmt(Node->getTryBlock());
  for(unsigned i = 0, e = Node->getNumHandlers(); i < e; ++i) {
    OS << " ";
    PrintRawCXXCatchStmt(Node->getHandler(i));
  }
  OS << "\n";
}

//===----------------------------------------------------------------------===//
//  Expr printing methods.
//===----------------------------------------------------------------------===//

void StmtPrinter::VisitExpr(Expr *Node) {
  OS << "<<unknown expr type>>";
}

void StmtPrinter::VisitDeclRefExpr(DeclRefExpr *Node) {
  OS << Node->getDecl()->getNameAsString();
}

void StmtPrinter::VisitQualifiedDeclRefExpr(QualifiedDeclRefExpr *Node) {  
  NamedDecl *D = Node->getDecl();

  Node->getQualifier()->print(OS, Policy);
  OS << D->getNameAsString();
}

void StmtPrinter::VisitUnresolvedDeclRefExpr(UnresolvedDeclRefExpr *Node) {  
  Node->getQualifier()->print(OS, Policy);
  OS << Node->getDeclName().getAsString();
}

void StmtPrinter::VisitTemplateIdRefExpr(TemplateIdRefExpr *Node) {
  if (Node->getQualifier())
    Node->getQualifier()->print(OS, Policy);
  Node->getTemplateName().print(OS, Policy, true);
  OS << '<';
  OS << TemplateSpecializationType::PrintTemplateArgumentList(
                                                      Node->getTemplateArgs(),
                                                   Node->getNumTemplateArgs(),
                                                              Policy);
  OS << '>';
}

void StmtPrinter::VisitObjCIvarRefExpr(ObjCIvarRefExpr *Node) {
  if (Node->getBase()) {
    PrintExpr(Node->getBase());
    OS << (Node->isArrow() ? "->" : ".");
  }
  OS << Node->getDecl()->getNameAsString();
}

void StmtPrinter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *Node) {
  if (Node->getBase()) {
    PrintExpr(Node->getBase());
    OS << ".";
  }
  OS << Node->getProperty()->getNameAsCString();
}

void StmtPrinter::VisitObjCImplicitSetterGetterRefExpr(
                                        ObjCImplicitSetterGetterRefExpr *Node) {
  if (Node->getBase()) {
    PrintExpr(Node->getBase());
    OS << ".";
  }
  if (Node->getGetterMethod())
    OS << Node->getGetterMethod()->getNameAsString();
    
}

void StmtPrinter::VisitPredefinedExpr(PredefinedExpr *Node) {
  switch (Node->getIdentType()) {
    default:
      assert(0 && "unknown case");
    case PredefinedExpr::Func:
      OS << "__func__";
      break;
    case PredefinedExpr::Function:
      OS << "__FUNCTION__";
      break;
    case PredefinedExpr::PrettyFunction:
      OS << "__PRETTY_FUNCTION__";
      break;
  }
}

void StmtPrinter::VisitCharacterLiteral(CharacterLiteral *Node) {
  unsigned value = Node->getValue();
  if (Node->isWide())
    OS << "L";
  switch (value) {
  case '\\':
    OS << "'\\\\'";
    break;
  case '\'':
    OS << "'\\''";
    break;
  case '\a':
    // TODO: K&R: the meaning of '\\a' is different in traditional C
    OS << "'\\a'";
    break;
  case '\b':
    OS << "'\\b'";
    break;
  // Nonstandard escape sequence.
  /*case '\e':
    OS << "'\\e'";
    break;*/
  case '\f':
    OS << "'\\f'";
    break;
  case '\n':
    OS << "'\\n'";
    break;
  case '\r':
    OS << "'\\r'";
    break;
  case '\t':
    OS << "'\\t'";
    break;
  case '\v':
    OS << "'\\v'";
    break;
  default:
    if (value < 256 && isprint(value)) {
      OS << "'" << (char)value << "'";
    } else if (value < 256) {
      OS << "'\\x" << llvm::format("%x", value) << "'";
    } else {
      // FIXME what to really do here?
      OS << value;
    }
  }
}

void StmtPrinter::VisitIntegerLiteral(IntegerLiteral *Node) {
  bool isSigned = Node->getType()->isSignedIntegerType();
  OS << Node->getValue().toString(10, isSigned);
  
  // Emit suffixes.  Integer literals are always a builtin integer type.
  switch (Node->getType()->getAsBuiltinType()->getKind()) {
  default: assert(0 && "Unexpected type for integer literal!");
  case BuiltinType::Int:       break; // no suffix.
  case BuiltinType::UInt:      OS << 'U'; break;
  case BuiltinType::Long:      OS << 'L'; break;
  case BuiltinType::ULong:     OS << "UL"; break;
  case BuiltinType::LongLong:  OS << "LL"; break;
  case BuiltinType::ULongLong: OS << "ULL"; break;
  }
}
void StmtPrinter::VisitFloatingLiteral(FloatingLiteral *Node) {
  // FIXME: print value more precisely.
  OS << Node->getValueAsApproximateDouble();
}

void StmtPrinter::VisitImaginaryLiteral(ImaginaryLiteral *Node) {
  PrintExpr(Node->getSubExpr());
  OS << "i";
}

void StmtPrinter::VisitStringLiteral(StringLiteral *Str) {
  if (Str->isWide()) OS << 'L';
  OS << '"';

  // FIXME: this doesn't print wstrings right.
  for (unsigned i = 0, e = Str->getByteLength(); i != e; ++i) {
    unsigned char Char = Str->getStrData()[i];
    
    switch (Char) {
    default:
      if (isprint(Char))
        OS << (char)Char;
      else  // Output anything hard as an octal escape.
        OS << '\\'
        << (char)('0'+ ((Char >> 6) & 7))
        << (char)('0'+ ((Char >> 3) & 7))
        << (char)('0'+ ((Char >> 0) & 7));
      break;
    // Handle some common non-printable cases to make dumps prettier.
    case '\\': OS << "\\\\"; break;
    case '"': OS << "\\\""; break;
    case '\n': OS << "\\n"; break;
    case '\t': OS << "\\t"; break;
    case '\a': OS << "\\a"; break;
    case '\b': OS << "\\b"; break;
    }
  }
  OS << '"';
}
void StmtPrinter::VisitParenExpr(ParenExpr *Node) {
  OS << "(";
  PrintExpr(Node->getSubExpr());
  OS << ")";
}
void StmtPrinter::VisitUnaryOperator(UnaryOperator *Node) {
  if (!Node->isPostfix()) {
    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
    
    // Print a space if this is an "identifier operator" like __real, or if
    // it might be concatenated incorrectly like '+'.
    switch (Node->getOpcode()) {
    default: break;
    case UnaryOperator::Real:
    case UnaryOperator::Imag:
    case UnaryOperator::Extension:
      OS << ' ';
      break;
    case UnaryOperator::Plus:
    case UnaryOperator::Minus:
      if (isa<UnaryOperator>(Node->getSubExpr()))
        OS << ' ';
      break;
    }
  }
  PrintExpr(Node->getSubExpr());
  
  if (Node->isPostfix())
    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
}

bool StmtPrinter::PrintOffsetOfDesignator(Expr *E) {
  if (isa<UnaryOperator>(E)) {
    // Base case, print the type and comma.
    OS << E->getType().getAsString() << ", ";
    return true;
  } else if (ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) {
    PrintOffsetOfDesignator(ASE->getLHS());
    OS << "[";
    PrintExpr(ASE->getRHS());
    OS << "]";
    return false;
  } else {
    MemberExpr *ME = cast<MemberExpr>(E);
    bool IsFirst = PrintOffsetOfDesignator(ME->getBase());
    OS << (IsFirst ? "" : ".") << ME->getMemberDecl()->getNameAsString();
    return false;
  }
}

void StmtPrinter::VisitUnaryOffsetOf(UnaryOperator *Node) {
  OS << "__builtin_offsetof(";
  PrintOffsetOfDesignator(Node->getSubExpr());
  OS << ")";
}

void StmtPrinter::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *Node) {
  OS << (Node->isSizeOf() ? "sizeof" : "__alignof");
  if (Node->isArgumentType())
    OS << "(" << Node->getArgumentType().getAsString() << ")";
  else {
    OS << " ";
    PrintExpr(Node->getArgumentExpr());
  }
}
void StmtPrinter::VisitArraySubscriptExpr(ArraySubscriptExpr *Node) {
  PrintExpr(Node->getLHS());
  OS << "[";
  PrintExpr(Node->getRHS());
  OS << "]";
}

void StmtPrinter::VisitCallExpr(CallExpr *Call) {
  PrintExpr(Call->getCallee());
  OS << "(";
  for (unsigned i = 0, e = Call->getNumArgs(); i != e; ++i) {
    if (isa<CXXDefaultArgExpr>(Call->getArg(i))) {
      // Don't print any defaulted arguments
      break;
    }

    if (i) OS << ", ";
    PrintExpr(Call->getArg(i));
  }
  OS << ")";
}
void StmtPrinter::VisitMemberExpr(MemberExpr *Node) {
  // FIXME: Suppress printing implicit bases (like "this")
  PrintExpr(Node->getBase());
  OS << (Node->isArrow() ? "->" : ".");
  // FIXME: Suppress printing references to unnamed objects
  // representing anonymous unions/structs
  OS << Node->getMemberDecl()->getNameAsString();
}
void StmtPrinter::VisitObjCIsaExpr(ObjCIsaExpr *Node) {
  PrintExpr(Node->getBase());
  OS << (Node->isArrow() ? "->isa" : ".isa");
}

void StmtPrinter::VisitExtVectorElementExpr(ExtVectorElementExpr *Node) {
  PrintExpr(Node->getBase());
  OS << ".";
  OS << Node->getAccessor().getName();
}
void StmtPrinter::VisitCastExpr(CastExpr *) {
  assert(0 && "CastExpr is an abstract class");
}
void StmtPrinter::VisitExplicitCastExpr(ExplicitCastExpr *) {
  assert(0 && "ExplicitCastExpr is an abstract class");
}
void StmtPrinter::VisitCStyleCastExpr(CStyleCastExpr *Node) {
  OS << "(" << Node->getType().getAsString() << ")";
  PrintExpr(Node->getSubExpr());
}
void StmtPrinter::VisitCompoundLiteralExpr(CompoundLiteralExpr *Node) {
  OS << "(" << Node->getType().getAsString() << ")";
  PrintExpr(Node->getInitializer());
}
void StmtPrinter::VisitImplicitCastExpr(ImplicitCastExpr *Node) {
  // No need to print anything, simply forward to the sub expression.
  PrintExpr(Node->getSubExpr());
}
void StmtPrinter::VisitBinaryOperator(BinaryOperator *Node) {
  PrintExpr(Node->getLHS());
  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
  PrintExpr(Node->getRHS());
}
void StmtPrinter::VisitCompoundAssignOperator(CompoundAssignOperator *Node) {
  PrintExpr(Node->getLHS());
  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
  PrintExpr(Node->getRHS());
}
void StmtPrinter::VisitConditionalOperator(ConditionalOperator *Node) {
  PrintExpr(Node->getCond());
  
  if (Node->getLHS()) {
    OS << " ? ";
    PrintExpr(Node->getLHS());
    OS << " : ";
  }
  else { // Handle GCC extension where LHS can be NULL.
    OS << " ?: ";
  }
  
  PrintExpr(Node->getRHS());
}

// GNU extensions.

void StmtPrinter::VisitAddrLabelExpr(AddrLabelExpr *Node) {
  OS << "&&" << Node->getLabel()->getName();
}

void StmtPrinter::VisitStmtExpr(StmtExpr *E) {
  OS << "(";
  PrintRawCompoundStmt(E->getSubStmt());
  OS << ")";
}

void StmtPrinter::VisitTypesCompatibleExpr(TypesCompatibleExpr *Node) {
  OS << "__builtin_types_compatible_p(";
  OS << Node->getArgType1().getAsString() << ",";
  OS << Node->getArgType2().getAsString() << ")";
}

void StmtPrinter::VisitChooseExpr(ChooseExpr *Node) {
  OS << "__builtin_choose_expr(";
  PrintExpr(Node->getCond());
  OS << ", ";
  PrintExpr(Node->getLHS());
  OS << ", ";
  PrintExpr(Node->getRHS());
  OS << ")";
}

void StmtPrinter::VisitGNUNullExpr(GNUNullExpr *) {
  OS << "__null";
}

void StmtPrinter::VisitShuffleVectorExpr(ShuffleVectorExpr *Node) {
  OS << "__builtin_shufflevector(";
  for (unsigned i = 0, e = Node->getNumSubExprs(); i != e; ++i) {
    if (i) OS << ", ";
    PrintExpr(Node->getExpr(i));
  }
  OS << ")";
}

void StmtPrinter::VisitInitListExpr(InitListExpr* Node) {
  if (Node->getSyntacticForm()) {
    Visit(Node->getSyntacticForm());
    return;
  }

  OS << "{ ";
  for (unsigned i = 0, e = Node->getNumInits(); i != e; ++i) {
    if (i) OS << ", ";
    if (Node->getInit(i))
      PrintExpr(Node->getInit(i));
    else
      OS << "0";
  }
  OS << " }";
}

void StmtPrinter::VisitParenListExpr(ParenListExpr* Node) {
  OS << "( ";
  for (unsigned i = 0, e = Node->getNumExprs(); i != e; ++i) {
    if (i) OS << ", ";
    PrintExpr(Node->getExpr(i));
  }
  OS << " )";
}

void StmtPrinter::VisitDesignatedInitExpr(DesignatedInitExpr *Node) {
  for (DesignatedInitExpr::designators_iterator D = Node->designators_begin(),
                      DEnd = Node->designators_end();
       D != DEnd; ++D) {
    if (D->isFieldDesignator()) {
      if (D->getDotLoc().isInvalid())
        OS << D->getFieldName()->getName() << ":";
      else
        OS << "." << D->getFieldName()->getName();
    } else {
      OS << "[";
      if (D->isArrayDesignator()) {
        PrintExpr(Node->getArrayIndex(*D));
      } else {
        PrintExpr(Node->getArrayRangeStart(*D));
        OS << " ... ";
        PrintExpr(Node->getArrayRangeEnd(*D));        
      }
      OS << "]";
    }
  }

  OS << " = ";
  PrintExpr(Node->getInit());
}

void StmtPrinter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *Node) {
  if (Policy.LangOpts.CPlusPlus)
    OS << "/*implicit*/" << Node->getType().getAsString(Policy) << "()";
  else {
    OS << "/*implicit*/(" << Node->getType().getAsString(Policy) << ")";
    if (Node->getType()->isRecordType())
      OS << "{}";
    else
      OS << 0;
  }
}

void StmtPrinter::VisitVAArgExpr(VAArgExpr *Node) {
  OS << "__builtin_va_arg(";
  PrintExpr(Node->getSubExpr());
  OS << ", ";
  OS << Node->getType().getAsString();
  OS << ")";
}

// C++
void StmtPrinter::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *Node) {
  const char *OpStrings[NUM_OVERLOADED_OPERATORS] = {
    "",
#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
    Spelling,
#include "clang/Basic/OperatorKinds.def"
  };

  OverloadedOperatorKind Kind = Node->getOperator();
  if (Kind == OO_PlusPlus || Kind == OO_MinusMinus) {
    if (Node->getNumArgs() == 1) {
      OS << OpStrings[Kind] << ' ';
      PrintExpr(Node->getArg(0));
    } else {
      PrintExpr(Node->getArg(0));
      OS << ' ' << OpStrings[Kind];
    }
  } else if (Kind == OO_Call) {
    PrintExpr(Node->getArg(0));
    OS << '(';
    for (unsigned ArgIdx = 1; ArgIdx < Node->getNumArgs(); ++ArgIdx) {
      if (ArgIdx > 1)
        OS << ", ";
      if (!isa<CXXDefaultArgExpr>(Node->getArg(ArgIdx)))
        PrintExpr(Node->getArg(ArgIdx));
    }
    OS << ')';
  } else if (Kind == OO_Subscript) {
    PrintExpr(Node->getArg(0));
    OS << '[';
    PrintExpr(Node->getArg(1));
    OS << ']';
  } else if (Node->getNumArgs() == 1) {
    OS << OpStrings[Kind] << ' ';
    PrintExpr(Node->getArg(0));
  } else if (Node->getNumArgs() == 2) {
    PrintExpr(Node->getArg(0));
    OS << ' ' << OpStrings[Kind] << ' ';
    PrintExpr(Node->getArg(1));
  } else {
    assert(false && "unknown overloaded operator");
  }
}

void StmtPrinter::VisitCXXMemberCallExpr(CXXMemberCallExpr *Node) {
  VisitCallExpr(cast<CallExpr>(Node));
}

void StmtPrinter::VisitCXXNamedCastExpr(CXXNamedCastExpr *Node) {
  OS << Node->getCastName() << '<';
  OS << Node->getTypeAsWritten().getAsString() << ">(";
  PrintExpr(Node->getSubExpr());
  OS << ")";
}

void StmtPrinter::VisitCXXStaticCastExpr(CXXStaticCastExpr *Node) {
  VisitCXXNamedCastExpr(Node);
}

void StmtPrinter::VisitCXXDynamicCastExpr(CXXDynamicCastExpr *Node) {
  VisitCXXNamedCastExpr(Node);
}

void StmtPrinter::VisitCXXReinterpretCastExpr(CXXReinterpretCastExpr *Node) {
  VisitCXXNamedCastExpr(Node);
}

void StmtPrinter::VisitCXXConstCastExpr(CXXConstCastExpr *Node) {
  VisitCXXNamedCastExpr(Node);
}

void StmtPrinter::VisitCXXTypeidExpr(CXXTypeidExpr *Node) {
  OS << "typeid(";
  if (Node->isTypeOperand()) {
    OS << Node->getTypeOperand().getAsString();
  } else {
    PrintExpr(Node->getExprOperand());
  }
  OS << ")";
}

void StmtPrinter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *Node) {
  OS << (Node->getValue() ? "true" : "false");
}

void StmtPrinter::VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *Node) {
  OS << "nullptr";
}

void StmtPrinter::VisitCXXThisExpr(CXXThisExpr *Node) {
  OS << "this";
}

void StmtPrinter::VisitCXXThrowExpr(CXXThrowExpr *Node) {
  if (Node->getSubExpr() == 0)
    OS << "throw";
  else {
    OS << "throw ";
    PrintExpr(Node->getSubExpr());
  }
}

void StmtPrinter::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *Node) {
  // Nothing to print: we picked up the default argument
}

void StmtPrinter::VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr *Node) {
  OS << Node->getType().getAsString();
  OS << "(";
  PrintExpr(Node->getSubExpr());
  OS << ")";
}

void StmtPrinter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *Node) {
  PrintExpr(Node->getSubExpr());
}

void StmtPrinter::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *Node) {
  OS << Node->getType().getAsString();
  OS << "(";
  for (CXXTemporaryObjectExpr::arg_iterator Arg = Node->arg_begin(),
                                         ArgEnd = Node->arg_end(); 
       Arg != ArgEnd; ++Arg) {
    if (Arg != Node->arg_begin())
      OS << ", ";
    PrintExpr(*Arg);
  }
  OS << ")";
}

void StmtPrinter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *Node) {
  OS << Node->getType().getAsString() << "()";
}

void
StmtPrinter::VisitCXXConditionDeclExpr(CXXConditionDeclExpr *E) {
  PrintRawDecl(E->getVarDecl());
}

void StmtPrinter::VisitCXXNewExpr(CXXNewExpr *E) {
  if (E->isGlobalNew())
    OS << "::";
  OS << "new ";
  unsigned NumPlace = E->getNumPlacementArgs();
  if (NumPlace > 0) {
    OS << "(";
    PrintExpr(E->getPlacementArg(0));
    for (unsigned i = 1; i < NumPlace; ++i) {
      OS << ", ";
      PrintExpr(E->getPlacementArg(i));
    }
    OS << ") ";
  }
  if (E->isParenTypeId())
    OS << "(";
  std::string TypeS;
  if (Expr *Size = E->getArraySize()) {
    llvm::raw_string_ostream s(TypeS);
    Size->printPretty(s, Context, Helper, Policy);
    s.flush();
    TypeS = "[" + TypeS + "]";
  }
  E->getAllocatedType().getAsStringInternal(TypeS, Policy);
  OS << TypeS;
  if (E->isParenTypeId())
    OS << ")";

  if (E->hasInitializer()) {
    OS << "(";
    unsigned NumCons = E->getNumConstructorArgs();
    if (NumCons > 0) {
      PrintExpr(E->getConstructorArg(0));
      for (unsigned i = 1; i < NumCons; ++i) {
        OS << ", ";
        PrintExpr(E->getConstructorArg(i));
      }
    }
    OS << ")";
  }
}

void StmtPrinter::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
  if (E->isGlobalDelete())
    OS << "::";
  OS << "delete ";
  if (E->isArrayForm())
    OS << "[] ";
  PrintExpr(E->getArgument());
}

void StmtPrinter::VisitUnresolvedFunctionNameExpr(UnresolvedFunctionNameExpr *E) {
  OS << E->getName().getAsString();
}

void StmtPrinter::VisitCXXConstructExpr(CXXConstructExpr *E) {
  // Nothing to print.
}

void StmtPrinter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
  // Just forward to the sub expression.
  PrintExpr(E->getSubExpr());
}

void 
StmtPrinter::VisitCXXUnresolvedConstructExpr(
                                           CXXUnresolvedConstructExpr *Node) {
  OS << Node->getTypeAsWritten().getAsString();
  OS << "(";
  for (CXXUnresolvedConstructExpr::arg_iterator Arg = Node->arg_begin(),
                                             ArgEnd = Node->arg_end(); 
       Arg != ArgEnd; ++Arg) {
    if (Arg != Node->arg_begin())
      OS << ", ";
    PrintExpr(*Arg);
  }
  OS << ")";
}

void StmtPrinter::VisitCXXAdornedMemberExpr(CXXAdornedMemberExpr *Node) {
  // FIXME: Suppress printing implicit bases (like "this")
  PrintExpr(Node->getBase());
  OS << (Node->isArrow() ? "->" : ".");
  // FIXME: Suppress printing references to unnamed objects
  // representing anonymous unions/structs
  Node->getQualifier()->print(OS, Policy);
  OS << Node->getMemberDecl()->getNameAsString();
}

void StmtPrinter::VisitCXXUnresolvedMemberExpr(CXXUnresolvedMemberExpr *Node) {
  PrintExpr(Node->getBase());
  OS << (Node->isArrow() ? "->" : ".");
  OS << Node->getMember().getAsString();
}

static const char *getTypeTraitName(UnaryTypeTrait UTT) {
  switch (UTT) {
  default: assert(false && "Unknown type trait");
  case UTT_HasNothrowAssign:      return "__has_nothrow_assign";
  case UTT_HasNothrowCopy:        return "__has_nothrow_copy";
  case UTT_HasNothrowConstructor: return "__has_nothrow_constructor";
  case UTT_HasTrivialAssign:      return "__has_trivial_assign";
  case UTT_HasTrivialCopy:        return "__has_trivial_copy";
  case UTT_HasTrivialConstructor: return "__has_trivial_constructor";
  case UTT_HasTrivialDestructor:  return "__has_trivial_destructor";
  case UTT_HasVirtualDestructor:  return "__has_virtual_destructor";
  case UTT_IsAbstract:            return "__is_abstract";
  case UTT_IsClass:               return "__is_class";
  case UTT_IsEmpty:               return "__is_empty";
  case UTT_IsEnum:                return "__is_enum";
  case UTT_IsPOD:                 return "__is_pod";
  case UTT_IsPolymorphic:         return "__is_polymorphic";
  case UTT_IsUnion:               return "__is_union";
  }
}

void StmtPrinter::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
  OS << getTypeTraitName(E->getTrait()) << "("
     << E->getQueriedType().getAsString() << ")";
}

// Obj-C 

void StmtPrinter::VisitObjCStringLiteral(ObjCStringLiteral *Node) {
  OS << "@";
  VisitStringLiteral(Node->getString());
}

void StmtPrinter::VisitObjCEncodeExpr(ObjCEncodeExpr *Node) {
  OS << "@encode(" << Node->getEncodedType().getAsString() << ')';
}

void StmtPrinter::VisitObjCSelectorExpr(ObjCSelectorExpr *Node) {
  OS << "@selector(" << Node->getSelector().getAsString() << ')';
}

void StmtPrinter::VisitObjCProtocolExpr(ObjCProtocolExpr *Node) {
  OS << "@protocol(" << Node->getProtocol()->getNameAsString() << ')';
}

void StmtPrinter::VisitObjCMessageExpr(ObjCMessageExpr *Mess) {
  OS << "[";
  Expr *receiver = Mess->getReceiver();
  if (receiver) PrintExpr(receiver);
  else OS << Mess->getClassName()->getName();
  OS << ' ';
  Selector selector = Mess->getSelector();
  if (selector.isUnarySelector()) {
    OS << selector.getIdentifierInfoForSlot(0)->getName();
  } else {
    for (unsigned i = 0, e = Mess->getNumArgs(); i != e; ++i) {
      if (i < selector.getNumArgs()) {
        if (i > 0) OS << ' ';
        if (selector.getIdentifierInfoForSlot(i))
          OS << selector.getIdentifierInfoForSlot(i)->getName() << ':';
        else
           OS << ":";
      }
      else OS << ", "; // Handle variadic methods.
      
      PrintExpr(Mess->getArg(i));
    }
  }
  OS << "]";
}

void StmtPrinter::VisitObjCSuperExpr(ObjCSuperExpr *) {
  OS << "super";
}

void StmtPrinter::VisitBlockExpr(BlockExpr *Node) {
  BlockDecl *BD = Node->getBlockDecl();
  OS << "^";
  
  const FunctionType *AFT = Node->getFunctionType();
  
  if (isa<FunctionNoProtoType>(AFT)) {
    OS << "()";
  } else if (!BD->param_empty() || cast<FunctionProtoType>(AFT)->isVariadic()) {
    OS << '(';
    std::string ParamStr;
    for (BlockDecl::param_iterator AI = BD->param_begin(),
         E = BD->param_end(); AI != E; ++AI) {
      if (AI != BD->param_begin()) OS << ", ";
      ParamStr = (*AI)->getNameAsString();
      (*AI)->getType().getAsStringInternal(ParamStr, Policy);
      OS << ParamStr;
    }
    
    const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
    if (FT->isVariadic()) {
      if (!BD->param_empty()) OS << ", ";
      OS << "...";
    }
    OS << ')';
  }
}

void StmtPrinter::VisitBlockDeclRefExpr(BlockDeclRefExpr *Node) {
  OS << Node->getDecl()->getNameAsString();
}
//===----------------------------------------------------------------------===//
// Stmt method implementations
//===----------------------------------------------------------------------===//

void Stmt::dumpPretty(ASTContext& Context) const {
  printPretty(llvm::errs(), Context, 0,
              PrintingPolicy(Context.getLangOptions()));
}

void Stmt::printPretty(llvm::raw_ostream &OS, ASTContext& Context,
                       PrinterHelper* Helper,
                       const PrintingPolicy &Policy,
                       unsigned Indentation) const {
  if (this == 0) {
    OS << "<NULL>";
    return;
  }

  if (Policy.Dump) {
    dump(Context.getSourceManager());
    return;
  }
  
  StmtPrinter P(OS, Context, Helper, Policy, Indentation);
  P.Visit(const_cast<Stmt*>(this));
}

//===----------------------------------------------------------------------===//
// PrinterHelper
//===----------------------------------------------------------------------===//

// Implement virtual destructor.
PrinterHelper::~PrinterHelper() {}