StmtPrinter.cpp revision f242b1b0c4e998911cb96b2ba7e27ab4a5abaed3 
1//===--- StmtPrinter.cpp - Printing implementation for Stmt ASTs ----------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the Stmt::dumpPretty/Stmt::printPretty methods, which
11// pretty print the AST back out to C code.
12//
13//===----------------------------------------------------------------------===//
14
15#include "clang/AST/StmtVisitor.h"
16#include "clang/AST/DeclCXX.h"
17#include "clang/AST/DeclObjC.h"
18#include "clang/AST/PrettyPrinter.h"
19#include "llvm/Support/Compiler.h"
20#include "llvm/Support/Streams.h"
21#include "llvm/Support/Format.h"
22using namespace clang;
23
24//===----------------------------------------------------------------------===//
25// StmtPrinter Visitor
26//===----------------------------------------------------------------------===//
27
28namespace  {
29  class VISIBILITY_HIDDEN StmtPrinter : public StmtVisitor<StmtPrinter> {
30    llvm::raw_ostream &OS;
31    ASTContext &Context;
32    unsigned IndentLevel;
33    clang::PrinterHelper* Helper;
34    PrintingPolicy Policy;
35
36  public:
37    StmtPrinter(llvm::raw_ostream &os, ASTContext &C, PrinterHelper* helper,
38                const PrintingPolicy &Policy,
39                unsigned Indentation = 0)
40      : OS(os), Context(C), IndentLevel(Indentation), Helper(helper),
41        Policy(Policy) {}
42
43    void PrintStmt(Stmt *S) {
44      PrintStmt(S, Policy.Indentation);
45    }
46
47    void PrintStmt(Stmt *S, int SubIndent) {
48      IndentLevel += SubIndent;
49      if (S && isa<Expr>(S)) {
50        // If this is an expr used in a stmt context, indent and newline it.
51        Indent();
52        Visit(S);
53        OS << ";\n";
54      } else if (S) {
55        Visit(S);
56      } else {
57        Indent() << "<<<NULL STATEMENT>>>\n";
58      }
59      IndentLevel -= SubIndent;
60    }
61
62    void PrintRawCompoundStmt(CompoundStmt *S);
63    void PrintRawDecl(Decl *D);
64    void PrintRawDeclStmt(DeclStmt *S);
65    void PrintRawIfStmt(IfStmt *If);
66    void PrintRawCXXCatchStmt(CXXCatchStmt *Catch);
67
68    void PrintExpr(Expr *E) {
69      if (E)
70        Visit(E);
71      else
72        OS << "<null expr>";
73    }
74
75    llvm::raw_ostream &Indent(int Delta = 0) {
76      for (int i = 0, e = IndentLevel+Delta; i < e; ++i)
77        OS << "  ";
78      return OS;
79    }
80
81    bool PrintOffsetOfDesignator(Expr *E);
82    void VisitUnaryOffsetOf(UnaryOperator *Node);
83
84    void Visit(Stmt* S) {
85      if (Helper && Helper->handledStmt(S,OS))
86          return;
87      else StmtVisitor<StmtPrinter>::Visit(S);
88    }
89
90    void VisitStmt(Stmt *Node);
91#define STMT(CLASS, PARENT) \
92    void Visit##CLASS(CLASS *Node);
93#include "clang/AST/StmtNodes.def"
94  };
95}
96
97//===----------------------------------------------------------------------===//
98//  Stmt printing methods.
99//===----------------------------------------------------------------------===//
100
101void StmtPrinter::VisitStmt(Stmt *Node) {
102  Indent() << "<<unknown stmt type>>\n";
103}
104
105/// PrintRawCompoundStmt - Print a compound stmt without indenting the {, and
106/// with no newline after the }.
107void StmtPrinter::PrintRawCompoundStmt(CompoundStmt *Node) {
108  OS << "{\n";
109  for (CompoundStmt::body_iterator I = Node->body_begin(), E = Node->body_end();
110       I != E; ++I)
111    PrintStmt(*I);
112
113  Indent() << "}";
114}
115
116void StmtPrinter::PrintRawDecl(Decl *D) {
117  D->print(OS, Policy, IndentLevel);
118}
119
120void StmtPrinter::PrintRawDeclStmt(DeclStmt *S) {
121  DeclStmt::decl_iterator Begin = S->decl_begin(), End = S->decl_end();
122  llvm::SmallVector<Decl*, 2> Decls;
123  for ( ; Begin != End; ++Begin)
124    Decls.push_back(*Begin);
125
126  Decl::printGroup(Decls.data(), Decls.size(), OS, Policy, IndentLevel);
127}
128
129void StmtPrinter::VisitNullStmt(NullStmt *Node) {
130  Indent() << ";\n";
131}
132
133void StmtPrinter::VisitDeclStmt(DeclStmt *Node) {
134  Indent();
135  PrintRawDeclStmt(Node);
136  OS << ";\n";
137}
138
139void StmtPrinter::VisitCompoundStmt(CompoundStmt *Node) {
140  Indent();
141  PrintRawCompoundStmt(Node);
142  OS << "\n";
143}
144
145void StmtPrinter::VisitCaseStmt(CaseStmt *Node) {
146  Indent(-1) << "case ";
147  PrintExpr(Node->getLHS());
148  if (Node->getRHS()) {
149    OS << " ... ";
150    PrintExpr(Node->getRHS());
151  }
152  OS << ":\n";
153
154  PrintStmt(Node->getSubStmt(), 0);
155}
156
157void StmtPrinter::VisitDefaultStmt(DefaultStmt *Node) {
158  Indent(-1) << "default:\n";
159  PrintStmt(Node->getSubStmt(), 0);
160}
161
162void StmtPrinter::VisitLabelStmt(LabelStmt *Node) {
163  Indent(-1) << Node->getName() << ":\n";
164  PrintStmt(Node->getSubStmt(), 0);
165}
166
167void StmtPrinter::PrintRawIfStmt(IfStmt *If) {
168  OS << "if (";
169  PrintExpr(If->getCond());
170  OS << ')';
171
172  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(If->getThen())) {
173    OS << ' ';
174    PrintRawCompoundStmt(CS);
175    OS << (If->getElse() ? ' ' : '\n');
176  } else {
177    OS << '\n';
178    PrintStmt(If->getThen());
179    if (If->getElse()) Indent();
180  }
181
182  if (Stmt *Else = If->getElse()) {
183    OS << "else";
184
185    if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Else)) {
186      OS << ' ';
187      PrintRawCompoundStmt(CS);
188      OS << '\n';
189    } else if (IfStmt *ElseIf = dyn_cast<IfStmt>(Else)) {
190      OS << ' ';
191      PrintRawIfStmt(ElseIf);
192    } else {
193      OS << '\n';
194      PrintStmt(If->getElse());
195    }
196  }
197}
198
199void StmtPrinter::VisitIfStmt(IfStmt *If) {
200  Indent();
201  PrintRawIfStmt(If);
202}
203
204void StmtPrinter::VisitSwitchStmt(SwitchStmt *Node) {
205  Indent() << "switch (";
206  PrintExpr(Node->getCond());
207  OS << ")";
208
209  // Pretty print compoundstmt bodies (very common).
210  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
211    OS << " ";
212    PrintRawCompoundStmt(CS);
213    OS << "\n";
214  } else {
215    OS << "\n";
216    PrintStmt(Node->getBody());
217  }
218}
219
220void StmtPrinter::VisitSwitchCase(SwitchCase*) {
221  assert(0 && "SwitchCase is an abstract class");
222}
223
224void StmtPrinter::VisitWhileStmt(WhileStmt *Node) {
225  Indent() << "while (";
226  PrintExpr(Node->getCond());
227  OS << ")\n";
228  PrintStmt(Node->getBody());
229}
230
231void StmtPrinter::VisitDoStmt(DoStmt *Node) {
232  Indent() << "do ";
233  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
234    PrintRawCompoundStmt(CS);
235    OS << " ";
236  } else {
237    OS << "\n";
238    PrintStmt(Node->getBody());
239    Indent();
240  }
241
242  OS << "while (";
243  PrintExpr(Node->getCond());
244  OS << ");\n";
245}
246
247void StmtPrinter::VisitForStmt(ForStmt *Node) {
248  Indent() << "for (";
249  if (Node->getInit()) {
250    if (DeclStmt *DS = dyn_cast<DeclStmt>(Node->getInit()))
251      PrintRawDeclStmt(DS);
252    else
253      PrintExpr(cast<Expr>(Node->getInit()));
254  }
255  OS << ";";
256  if (Node->getCond()) {
257    OS << " ";
258    PrintExpr(Node->getCond());
259  }
260  OS << ";";
261  if (Node->getInc()) {
262    OS << " ";
263    PrintExpr(Node->getInc());
264  }
265  OS << ") ";
266
267  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
268    PrintRawCompoundStmt(CS);
269    OS << "\n";
270  } else {
271    OS << "\n";
272    PrintStmt(Node->getBody());
273  }
274}
275
276void StmtPrinter::VisitObjCForCollectionStmt(ObjCForCollectionStmt *Node) {
277  Indent() << "for (";
278  if (DeclStmt *DS = dyn_cast<DeclStmt>(Node->getElement()))
279    PrintRawDeclStmt(DS);
280  else
281    PrintExpr(cast<Expr>(Node->getElement()));
282  OS << " in ";
283  PrintExpr(Node->getCollection());
284  OS << ") ";
285
286  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
287    PrintRawCompoundStmt(CS);
288    OS << "\n";
289  } else {
290    OS << "\n";
291    PrintStmt(Node->getBody());
292  }
293}
294
295void StmtPrinter::VisitGotoStmt(GotoStmt *Node) {
296  Indent() << "goto " << Node->getLabel()->getName() << ";\n";
297}
298
299void StmtPrinter::VisitIndirectGotoStmt(IndirectGotoStmt *Node) {
300  Indent() << "goto *";
301  PrintExpr(Node->getTarget());
302  OS << ";\n";
303}
304
305void StmtPrinter::VisitContinueStmt(ContinueStmt *Node) {
306  Indent() << "continue;\n";
307}
308
309void StmtPrinter::VisitBreakStmt(BreakStmt *Node) {
310  Indent() << "break;\n";
311}
312
313
314void StmtPrinter::VisitReturnStmt(ReturnStmt *Node) {
315  Indent() << "return";
316  if (Node->getRetValue()) {
317    OS << " ";
318    PrintExpr(Node->getRetValue());
319  }
320  OS << ";\n";
321}
322
323
324void StmtPrinter::VisitAsmStmt(AsmStmt *Node) {
325  Indent() << "asm ";
326
327  if (Node->isVolatile())
328    OS << "volatile ";
329
330  OS << "(";
331  VisitStringLiteral(Node->getAsmString());
332
333  // Outputs
334  if (Node->getNumOutputs() != 0 || Node->getNumInputs() != 0 ||
335      Node->getNumClobbers() != 0)
336    OS << " : ";
337
338  for (unsigned i = 0, e = Node->getNumOutputs(); i != e; ++i) {
339    if (i != 0)
340      OS << ", ";
341
342    if (!Node->getOutputName(i).empty()) {
343      OS << '[';
344      OS << Node->getOutputName(i);
345      OS << "] ";
346    }
347
348    VisitStringLiteral(Node->getOutputConstraintLiteral(i));
349    OS << " ";
350    Visit(Node->getOutputExpr(i));
351  }
352
353  // Inputs
354  if (Node->getNumInputs() != 0 || Node->getNumClobbers() != 0)
355    OS << " : ";
356
357  for (unsigned i = 0, e = Node->getNumInputs(); i != e; ++i) {
358    if (i != 0)
359      OS << ", ";
360
361    if (!Node->getInputName(i).empty()) {
362      OS << '[';
363      OS << Node->getInputName(i);
364      OS << "] ";
365    }
366
367    VisitStringLiteral(Node->getInputConstraintLiteral(i));
368    OS << " ";
369    Visit(Node->getInputExpr(i));
370  }
371
372  // Clobbers
373  if (Node->getNumClobbers() != 0)
374    OS << " : ";
375
376  for (unsigned i = 0, e = Node->getNumClobbers(); i != e; ++i) {
377    if (i != 0)
378      OS << ", ";
379
380    VisitStringLiteral(Node->getClobber(i));
381  }
382
383  OS << ");\n";
384}
385
386void StmtPrinter::VisitObjCAtTryStmt(ObjCAtTryStmt *Node) {
387  Indent() << "@try";
388  if (CompoundStmt *TS = dyn_cast<CompoundStmt>(Node->getTryBody())) {
389    PrintRawCompoundStmt(TS);
390    OS << "\n";
391  }
392
393  for (ObjCAtCatchStmt *catchStmt =
394         static_cast<ObjCAtCatchStmt *>(Node->getCatchStmts());
395       catchStmt;
396       catchStmt =
397         static_cast<ObjCAtCatchStmt *>(catchStmt->getNextCatchStmt())) {
398    Indent() << "@catch(";
399    if (catchStmt->getCatchParamDecl()) {
400      if (Decl *DS = catchStmt->getCatchParamDecl())
401        PrintRawDecl(DS);
402    }
403    OS << ")";
404    if (CompoundStmt *CS = dyn_cast<CompoundStmt>(catchStmt->getCatchBody()))
405      {
406        PrintRawCompoundStmt(CS);
407        OS << "\n";
408      }
409  }
410
411  if (ObjCAtFinallyStmt *FS =static_cast<ObjCAtFinallyStmt *>(
412          Node->getFinallyStmt())) {
413    Indent() << "@finally";
414    PrintRawCompoundStmt(dyn_cast<CompoundStmt>(FS->getFinallyBody()));
415    OS << "\n";
416  }
417}
418
419void StmtPrinter::VisitObjCAtFinallyStmt(ObjCAtFinallyStmt *Node) {
420}
421
422void StmtPrinter::VisitObjCAtCatchStmt (ObjCAtCatchStmt *Node) {
423  Indent() << "@catch (...) { /* todo */ } \n";
424}
425
426void StmtPrinter::VisitObjCAtThrowStmt(ObjCAtThrowStmt *Node) {
427  Indent() << "@throw";
428  if (Node->getThrowExpr()) {
429    OS << " ";
430    PrintExpr(Node->getThrowExpr());
431  }
432  OS << ";\n";
433}
434
435void StmtPrinter::VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *Node) {
436  Indent() << "@synchronized (";
437  PrintExpr(Node->getSynchExpr());
438  OS << ")";
439  PrintRawCompoundStmt(Node->getSynchBody());
440  OS << "\n";
441}
442
443void StmtPrinter::PrintRawCXXCatchStmt(CXXCatchStmt *Node) {
444  OS << "catch (";
445  if (Decl *ExDecl = Node->getExceptionDecl())
446    PrintRawDecl(ExDecl);
447  else
448    OS << "...";
449  OS << ") ";
450  PrintRawCompoundStmt(cast<CompoundStmt>(Node->getHandlerBlock()));
451}
452
453void StmtPrinter::VisitCXXCatchStmt(CXXCatchStmt *Node) {
454  Indent();
455  PrintRawCXXCatchStmt(Node);
456  OS << "\n";
457}
458
459void StmtPrinter::VisitCXXTryStmt(CXXTryStmt *Node) {
460  Indent() << "try ";
461  PrintRawCompoundStmt(Node->getTryBlock());
462  for(unsigned i = 0, e = Node->getNumHandlers(); i < e; ++i) {
463    OS << " ";
464    PrintRawCXXCatchStmt(Node->getHandler(i));
465  }
466  OS << "\n";
467}
468
469//===----------------------------------------------------------------------===//
470//  Expr printing methods.
471//===----------------------------------------------------------------------===//
472
473void StmtPrinter::VisitExpr(Expr *Node) {
474  OS << "<<unknown expr type>>";
475}
476
477void StmtPrinter::VisitDeclRefExpr(DeclRefExpr *Node) {
478  OS << Node->getDecl()->getNameAsString();
479}
480
481void StmtPrinter::VisitQualifiedDeclRefExpr(QualifiedDeclRefExpr *Node) {
482  NamedDecl *D = Node->getDecl();
483
484  Node->getQualifier()->print(OS, Policy);
485  OS << D->getNameAsString();
486}
487
488void StmtPrinter::VisitUnresolvedDeclRefExpr(UnresolvedDeclRefExpr *Node) {
489  Node->getQualifier()->print(OS, Policy);
490  OS << Node->getDeclName().getAsString();
491}
492
493void StmtPrinter::VisitTemplateIdRefExpr(TemplateIdRefExpr *Node) {
494  if (Node->getQualifier())
495    Node->getQualifier()->print(OS, Policy);
496  Node->getTemplateName().print(OS, Policy, true);
497  OS << '<';
498  OS << TemplateSpecializationType::PrintTemplateArgumentList(
499                                                      Node->getTemplateArgs(),
500                                                   Node->getNumTemplateArgs(),
501                                                              Policy);
502  OS << '>';
503}
504
505void StmtPrinter::VisitObjCIvarRefExpr(ObjCIvarRefExpr *Node) {
506  if (Node->getBase()) {
507    PrintExpr(Node->getBase());
508    OS << (Node->isArrow() ? "->" : ".");
509  }
510  OS << Node->getDecl()->getNameAsString();
511}
512
513void StmtPrinter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *Node) {
514  if (Node->getBase()) {
515    PrintExpr(Node->getBase());
516    OS << ".";
517  }
518  OS << Node->getProperty()->getNameAsCString();
519}
520
521void StmtPrinter::VisitObjCKVCRefExpr(ObjCKVCRefExpr *Node) {
522  if (Node->getBase()) {
523    PrintExpr(Node->getBase());
524    OS << ".";
525  }
526  // FIXME: Setter/Getter names
527}
528
529void StmtPrinter::VisitPredefinedExpr(PredefinedExpr *Node) {
530  switch (Node->getIdentType()) {
531    default:
532      assert(0 && "unknown case");
533    case PredefinedExpr::Func:
534      OS << "__func__";
535      break;
536    case PredefinedExpr::Function:
537      OS << "__FUNCTION__";
538      break;
539    case PredefinedExpr::PrettyFunction:
540      OS << "__PRETTY_FUNCTION__";
541      break;
542  }
543}
544
545void StmtPrinter::VisitCharacterLiteral(CharacterLiteral *Node) {
546  unsigned value = Node->getValue();
547  if (Node->isWide())
548    OS << "L";
549  switch (value) {
550  case '\\':
551    OS << "'\\\\'";
552    break;
553  case '\'':
554    OS << "'\\''";
555    break;
556  case '\a':
557    // TODO: K&R: the meaning of '\\a' is different in traditional C
558    OS << "'\\a'";
559    break;
560  case '\b':
561    OS << "'\\b'";
562    break;
563  // Nonstandard escape sequence.
564  /*case '\e':
565    OS << "'\\e'";
566    break;*/
567  case '\f':
568    OS << "'\\f'";
569    break;
570  case '\n':
571    OS << "'\\n'";
572    break;
573  case '\r':
574    OS << "'\\r'";
575    break;
576  case '\t':
577    OS << "'\\t'";
578    break;
579  case '\v':
580    OS << "'\\v'";
581    break;
582  default:
583    if (value < 256 && isprint(value)) {
584      OS << "'" << (char)value << "'";
585    } else if (value < 256) {
586      OS << "'\\x" << llvm::format("%x", value) << "'";
587    } else {
588      // FIXME what to really do here?
589      OS << value;
590    }
591  }
592}
593
594void StmtPrinter::VisitIntegerLiteral(IntegerLiteral *Node) {
595  bool isSigned = Node->getType()->isSignedIntegerType();
596  OS << Node->getValue().toString(10, isSigned);
597
598  // Emit suffixes.  Integer literals are always a builtin integer type.
599  switch (Node->getType()->getAsBuiltinType()->getKind()) {
600  default: assert(0 && "Unexpected type for integer literal!");
601  case BuiltinType::Int:       break; // no suffix.
602  case BuiltinType::UInt:      OS << 'U'; break;
603  case BuiltinType::Long:      OS << 'L'; break;
604  case BuiltinType::ULong:     OS << "UL"; break;
605  case BuiltinType::LongLong:  OS << "LL"; break;
606  case BuiltinType::ULongLong: OS << "ULL"; break;
607  }
608}
609void StmtPrinter::VisitFloatingLiteral(FloatingLiteral *Node) {
610  // FIXME: print value more precisely.
611  OS << Node->getValueAsApproximateDouble();
612}
613
614void StmtPrinter::VisitImaginaryLiteral(ImaginaryLiteral *Node) {
615  PrintExpr(Node->getSubExpr());
616  OS << "i";
617}
618
619void StmtPrinter::VisitStringLiteral(StringLiteral *Str) {
620  if (Str->isWide()) OS << 'L';
621  OS << '"';
622
623  // FIXME: this doesn't print wstrings right.
624  for (unsigned i = 0, e = Str->getByteLength(); i != e; ++i) {
625    unsigned char Char = Str->getStrData()[i];
626
627    switch (Char) {
628    default:
629      if (isprint(Char))
630        OS << (char)Char;
631      else  // Output anything hard as an octal escape.
632        OS << '\\'
633        << (char)('0'+ ((Char >> 6) & 7))
634        << (char)('0'+ ((Char >> 3) & 7))
635        << (char)('0'+ ((Char >> 0) & 7));
636      break;
637    // Handle some common non-printable cases to make dumps prettier.
638    case '\\': OS << "\\\\"; break;
639    case '"': OS << "\\\""; break;
640    case '\n': OS << "\\n"; break;
641    case '\t': OS << "\\t"; break;
642    case '\a': OS << "\\a"; break;
643    case '\b': OS << "\\b"; break;
644    }
645  }
646  OS << '"';
647}
648void StmtPrinter::VisitParenExpr(ParenExpr *Node) {
649  OS << "(";
650  PrintExpr(Node->getSubExpr());
651  OS << ")";
652}
653void StmtPrinter::VisitUnaryOperator(UnaryOperator *Node) {
654  if (!Node->isPostfix()) {
655    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
656
657    // Print a space if this is an "identifier operator" like __real, or if
658    // it might be concatenated incorrectly like '+'.
659    switch (Node->getOpcode()) {
660    default: break;
661    case UnaryOperator::Real:
662    case UnaryOperator::Imag:
663    case UnaryOperator::Extension:
664      OS << ' ';
665      break;
666    case UnaryOperator::Plus:
667    case UnaryOperator::Minus:
668      if (isa<UnaryOperator>(Node->getSubExpr()))
669        OS << ' ';
670      break;
671    }
672  }
673  PrintExpr(Node->getSubExpr());
674
675  if (Node->isPostfix())
676    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
677}
678
679bool StmtPrinter::PrintOffsetOfDesignator(Expr *E) {
680  if (isa<UnaryOperator>(E)) {
681    // Base case, print the type and comma.
682    OS << E->getType().getAsString() << ", ";
683    return true;
684  } else if (ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) {
685    PrintOffsetOfDesignator(ASE->getLHS());
686    OS << "[";
687    PrintExpr(ASE->getRHS());
688    OS << "]";
689    return false;
690  } else {
691    MemberExpr *ME = cast<MemberExpr>(E);
692    bool IsFirst = PrintOffsetOfDesignator(ME->getBase());
693    OS << (IsFirst ? "" : ".") << ME->getMemberDecl()->getNameAsString();
694    return false;
695  }
696}
697
698void StmtPrinter::VisitUnaryOffsetOf(UnaryOperator *Node) {
699  OS << "__builtin_offsetof(";
700  PrintOffsetOfDesignator(Node->getSubExpr());
701  OS << ")";
702}
703
704void StmtPrinter::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *Node) {
705  OS << (Node->isSizeOf() ? "sizeof" : "__alignof");
706  if (Node->isArgumentType())
707    OS << "(" << Node->getArgumentType().getAsString() << ")";
708  else {
709    OS << " ";
710    PrintExpr(Node->getArgumentExpr());
711  }
712}
713void StmtPrinter::VisitArraySubscriptExpr(ArraySubscriptExpr *Node) {
714  PrintExpr(Node->getLHS());
715  OS << "[";
716  PrintExpr(Node->getRHS());
717  OS << "]";
718}
719
720void StmtPrinter::VisitCallExpr(CallExpr *Call) {
721  PrintExpr(Call->getCallee());
722  OS << "(";
723  for (unsigned i = 0, e = Call->getNumArgs(); i != e; ++i) {
724    if (isa<CXXDefaultArgExpr>(Call->getArg(i))) {
725      // Don't print any defaulted arguments
726      break;
727    }
728
729    if (i) OS << ", ";
730    PrintExpr(Call->getArg(i));
731  }
732  OS << ")";
733}
734void StmtPrinter::VisitMemberExpr(MemberExpr *Node) {
735  // FIXME: Suppress printing implicit bases (like "this")
736  PrintExpr(Node->getBase());
737  OS << (Node->isArrow() ? "->" : ".");
738  // FIXME: Suppress printing references to unnamed objects
739  // representing anonymous unions/structs
740  OS << Node->getMemberDecl()->getNameAsString();
741}
742void StmtPrinter::VisitObjCIsaExpr(ObjCIsaExpr *Node) {
743  PrintExpr(Node->getBase());
744  OS << (Node->isArrow() ? "->isa" : ".isa");
745}
746
747void StmtPrinter::VisitExtVectorElementExpr(ExtVectorElementExpr *Node) {
748  PrintExpr(Node->getBase());
749  OS << ".";
750  OS << Node->getAccessor().getName();
751}
752void StmtPrinter::VisitCastExpr(CastExpr *) {
753  assert(0 && "CastExpr is an abstract class");
754}
755void StmtPrinter::VisitExplicitCastExpr(ExplicitCastExpr *) {
756  assert(0 && "ExplicitCastExpr is an abstract class");
757}
758void StmtPrinter::VisitCStyleCastExpr(CStyleCastExpr *Node) {
759  OS << "(" << Node->getType().getAsString() << ")";
760  PrintExpr(Node->getSubExpr());
761}
762void StmtPrinter::VisitCompoundLiteralExpr(CompoundLiteralExpr *Node) {
763  OS << "(" << Node->getType().getAsString() << ")";
764  PrintExpr(Node->getInitializer());
765}
766void StmtPrinter::VisitImplicitCastExpr(ImplicitCastExpr *Node) {
767  // No need to print anything, simply forward to the sub expression.
768  PrintExpr(Node->getSubExpr());
769}
770void StmtPrinter::VisitBinaryOperator(BinaryOperator *Node) {
771  PrintExpr(Node->getLHS());
772  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
773  PrintExpr(Node->getRHS());
774}
775void StmtPrinter::VisitCompoundAssignOperator(CompoundAssignOperator *Node) {
776  PrintExpr(Node->getLHS());
777  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
778  PrintExpr(Node->getRHS());
779}
780void StmtPrinter::VisitConditionalOperator(ConditionalOperator *Node) {
781  PrintExpr(Node->getCond());
782
783  if (Node->getLHS()) {
784    OS << " ? ";
785    PrintExpr(Node->getLHS());
786    OS << " : ";
787  }
788  else { // Handle GCC extension where LHS can be NULL.
789    OS << " ?: ";
790  }
791
792  PrintExpr(Node->getRHS());
793}
794
795// GNU extensions.
796
797void StmtPrinter::VisitAddrLabelExpr(AddrLabelExpr *Node) {
798  OS << "&&" << Node->getLabel()->getName();
799}
800
801void StmtPrinter::VisitStmtExpr(StmtExpr *E) {
802  OS << "(";
803  PrintRawCompoundStmt(E->getSubStmt());
804  OS << ")";
805}
806
807void StmtPrinter::VisitTypesCompatibleExpr(TypesCompatibleExpr *Node) {
808  OS << "__builtin_types_compatible_p(";
809  OS << Node->getArgType1().getAsString() << ",";
810  OS << Node->getArgType2().getAsString() << ")";
811}
812
813void StmtPrinter::VisitChooseExpr(ChooseExpr *Node) {
814  OS << "__builtin_choose_expr(";
815  PrintExpr(Node->getCond());
816  OS << ", ";
817  PrintExpr(Node->getLHS());
818  OS << ", ";
819  PrintExpr(Node->getRHS());
820  OS << ")";
821}
822
823void StmtPrinter::VisitGNUNullExpr(GNUNullExpr *) {
824  OS << "__null";
825}
826
827void StmtPrinter::VisitShuffleVectorExpr(ShuffleVectorExpr *Node) {
828  OS << "__builtin_shufflevector(";
829  for (unsigned i = 0, e = Node->getNumSubExprs(); i != e; ++i) {
830    if (i) OS << ", ";
831    PrintExpr(Node->getExpr(i));
832  }
833  OS << ")";
834}
835
836void StmtPrinter::VisitInitListExpr(InitListExpr* Node) {
837  if (Node->getSyntacticForm()) {
838    Visit(Node->getSyntacticForm());
839    return;
840  }
841
842  OS << "{ ";
843  for (unsigned i = 0, e = Node->getNumInits(); i != e; ++i) {
844    if (i) OS << ", ";
845    if (Node->getInit(i))
846      PrintExpr(Node->getInit(i));
847    else
848      OS << "0";
849  }
850  OS << " }";
851}
852
853void StmtPrinter::VisitDesignatedInitExpr(DesignatedInitExpr *Node) {
854  for (DesignatedInitExpr::designators_iterator D = Node->designators_begin(),
855                      DEnd = Node->designators_end();
856       D != DEnd; ++D) {
857    if (D->isFieldDesignator()) {
858      if (D->getDotLoc().isInvalid())
859        OS << D->getFieldName()->getName() << ":";
860      else
861        OS << "." << D->getFieldName()->getName();
862    } else {
863      OS << "[";
864      if (D->isArrayDesignator()) {
865        PrintExpr(Node->getArrayIndex(*D));
866      } else {
867        PrintExpr(Node->getArrayRangeStart(*D));
868        OS << " ... ";
869        PrintExpr(Node->getArrayRangeEnd(*D));
870      }
871      OS << "]";
872    }
873  }
874
875  OS << " = ";
876  PrintExpr(Node->getInit());
877}
878
879void StmtPrinter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *Node) {
880  if (Policy.LangOpts.CPlusPlus)
881    OS << "/*implicit*/" << Node->getType().getAsString(Policy) << "()";
882  else {
883    OS << "/*implicit*/(" << Node->getType().getAsString(Policy) << ")";
884    if (Node->getType()->isRecordType())
885      OS << "{}";
886    else
887      OS << 0;
888  }
889}
890
891void StmtPrinter::VisitVAArgExpr(VAArgExpr *Node) {
892  OS << "__builtin_va_arg(";
893  PrintExpr(Node->getSubExpr());
894  OS << ", ";
895  OS << Node->getType().getAsString();
896  OS << ")";
897}
898
899// C++
900void StmtPrinter::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *Node) {
901  const char *OpStrings[NUM_OVERLOADED_OPERATORS] = {
902    "",
903#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
904    Spelling,
905#include "clang/Basic/OperatorKinds.def"
906  };
907
908  OverloadedOperatorKind Kind = Node->getOperator();
909  if (Kind == OO_PlusPlus || Kind == OO_MinusMinus) {
910    if (Node->getNumArgs() == 1) {
911      OS << OpStrings[Kind] << ' ';
912      PrintExpr(Node->getArg(0));
913    } else {
914      PrintExpr(Node->getArg(0));
915      OS << ' ' << OpStrings[Kind];
916    }
917  } else if (Kind == OO_Call) {
918    PrintExpr(Node->getArg(0));
919    OS << '(';
920    for (unsigned ArgIdx = 1; ArgIdx < Node->getNumArgs(); ++ArgIdx) {
921      if (ArgIdx > 1)
922        OS << ", ";
923      if (!isa<CXXDefaultArgExpr>(Node->getArg(ArgIdx)))
924        PrintExpr(Node->getArg(ArgIdx));
925    }
926    OS << ')';
927  } else if (Kind == OO_Subscript) {
928    PrintExpr(Node->getArg(0));
929    OS << '[';
930    PrintExpr(Node->getArg(1));
931    OS << ']';
932  } else if (Node->getNumArgs() == 1) {
933    OS << OpStrings[Kind] << ' ';
934    PrintExpr(Node->getArg(0));
935  } else if (Node->getNumArgs() == 2) {
936    PrintExpr(Node->getArg(0));
937    OS << ' ' << OpStrings[Kind] << ' ';
938    PrintExpr(Node->getArg(1));
939  } else {
940    assert(false && "unknown overloaded operator");
941  }
942}
943
944void StmtPrinter::VisitCXXMemberCallExpr(CXXMemberCallExpr *Node) {
945  VisitCallExpr(cast<CallExpr>(Node));
946}
947
948void StmtPrinter::VisitCXXNamedCastExpr(CXXNamedCastExpr *Node) {
949  OS << Node->getCastName() << '<';
950  OS << Node->getTypeAsWritten().getAsString() << ">(";
951  PrintExpr(Node->getSubExpr());
952  OS << ")";
953}
954
955void StmtPrinter::VisitCXXStaticCastExpr(CXXStaticCastExpr *Node) {
956  VisitCXXNamedCastExpr(Node);
957}
958
959void StmtPrinter::VisitCXXDynamicCastExpr(CXXDynamicCastExpr *Node) {
960  VisitCXXNamedCastExpr(Node);
961}
962
963void StmtPrinter::VisitCXXReinterpretCastExpr(CXXReinterpretCastExpr *Node) {
964  VisitCXXNamedCastExpr(Node);
965}
966
967void StmtPrinter::VisitCXXConstCastExpr(CXXConstCastExpr *Node) {
968  VisitCXXNamedCastExpr(Node);
969}
970
971void StmtPrinter::VisitCXXTypeidExpr(CXXTypeidExpr *Node) {
972  OS << "typeid(";
973  if (Node->isTypeOperand()) {
974    OS << Node->getTypeOperand().getAsString();
975  } else {
976    PrintExpr(Node->getExprOperand());
977  }
978  OS << ")";
979}
980
981void StmtPrinter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *Node) {
982  OS << (Node->getValue() ? "true" : "false");
983}
984
985void StmtPrinter::VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *Node) {
986  OS << "nullptr";
987}
988
989void StmtPrinter::VisitCXXThisExpr(CXXThisExpr *Node) {
990  OS << "this";
991}
992
993void StmtPrinter::VisitCXXThrowExpr(CXXThrowExpr *Node) {
994  if (Node->getSubExpr() == 0)
995    OS << "throw";
996  else {
997    OS << "throw ";
998    PrintExpr(Node->getSubExpr());
999  }
1000}
1001
1002void StmtPrinter::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *Node) {
1003  // Nothing to print: we picked up the default argument
1004}
1005
1006void StmtPrinter::VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr *Node) {
1007  OS << Node->getType().getAsString();
1008  OS << "(";
1009  PrintExpr(Node->getSubExpr());
1010  OS << ")";
1011}
1012
1013void StmtPrinter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *Node) {
1014  PrintExpr(Node->getSubExpr());
1015}
1016
1017void StmtPrinter::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *Node) {
1018  OS << Node->getType().getAsString();
1019  OS << "(";
1020  for (CXXTemporaryObjectExpr::arg_iterator Arg = Node->arg_begin(),
1021                                         ArgEnd = Node->arg_end();
1022       Arg != ArgEnd; ++Arg) {
1023    if (Arg != Node->arg_begin())
1024      OS << ", ";
1025    PrintExpr(*Arg);
1026  }
1027  OS << ")";
1028}
1029
1030void StmtPrinter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *Node) {
1031  OS << Node->getType().getAsString() << "()";
1032}
1033
1034void
1035StmtPrinter::VisitCXXConditionDeclExpr(CXXConditionDeclExpr *E) {
1036  PrintRawDecl(E->getVarDecl());
1037}
1038
1039void StmtPrinter::VisitCXXNewExpr(CXXNewExpr *E) {
1040  if (E->isGlobalNew())
1041    OS << "::";
1042  OS << "new ";
1043  unsigned NumPlace = E->getNumPlacementArgs();
1044  if (NumPlace > 0) {
1045    OS << "(";
1046    PrintExpr(E->getPlacementArg(0));
1047    for (unsigned i = 1; i < NumPlace; ++i) {
1048      OS << ", ";
1049      PrintExpr(E->getPlacementArg(i));
1050    }
1051    OS << ") ";
1052  }
1053  if (E->isParenTypeId())
1054    OS << "(";
1055  std::string TypeS;
1056  if (Expr *Size = E->getArraySize()) {
1057    llvm::raw_string_ostream s(TypeS);
1058    Size->printPretty(s, Context, Helper, Policy);
1059    s.flush();
1060    TypeS = "[" + TypeS + "]";
1061  }
1062  E->getAllocatedType().getAsStringInternal(TypeS, Policy);
1063  OS << TypeS;
1064  if (E->isParenTypeId())
1065    OS << ")";
1066
1067  if (E->hasInitializer()) {
1068    OS << "(";
1069    unsigned NumCons = E->getNumConstructorArgs();
1070    if (NumCons > 0) {
1071      PrintExpr(E->getConstructorArg(0));
1072      for (unsigned i = 1; i < NumCons; ++i) {
1073        OS << ", ";
1074        PrintExpr(E->getConstructorArg(i));
1075      }
1076    }
1077    OS << ")";
1078  }
1079}
1080
1081void StmtPrinter::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1082  if (E->isGlobalDelete())
1083    OS << "::";
1084  OS << "delete ";
1085  if (E->isArrayForm())
1086    OS << "[] ";
1087  PrintExpr(E->getArgument());
1088}
1089
1090void StmtPrinter::VisitUnresolvedFunctionNameExpr(UnresolvedFunctionNameExpr *E) {
1091  OS << E->getName().getAsString();
1092}
1093
1094void StmtPrinter::VisitCXXConstructExpr(CXXConstructExpr *E) {
1095  // Nothing to print.
1096}
1097
1098void StmtPrinter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
1099  // Just forward to the sub expression.
1100  PrintExpr(E->getSubExpr());
1101}
1102
1103void
1104StmtPrinter::VisitCXXUnresolvedConstructExpr(
1105                                           CXXUnresolvedConstructExpr *Node) {
1106  OS << Node->getTypeAsWritten().getAsString();
1107  OS << "(";
1108  for (CXXUnresolvedConstructExpr::arg_iterator Arg = Node->arg_begin(),
1109                                             ArgEnd = Node->arg_end();
1110       Arg != ArgEnd; ++Arg) {
1111    if (Arg != Node->arg_begin())
1112      OS << ", ";
1113    PrintExpr(*Arg);
1114  }
1115  OS << ")";
1116}
1117
1118void StmtPrinter::VisitCXXUnresolvedMemberExpr(CXXUnresolvedMemberExpr *Node) {
1119  PrintExpr(Node->getBase());
1120  OS << (Node->isArrow() ? "->" : ".");
1121  OS << Node->getMember().getAsString();
1122}
1123
1124static const char *getTypeTraitName(UnaryTypeTrait UTT) {
1125  switch (UTT) {
1126  default: assert(false && "Unknown type trait");
1127  case UTT_HasNothrowAssign:      return "__has_nothrow_assign";
1128  case UTT_HasNothrowCopy:        return "__has_nothrow_copy";
1129  case UTT_HasNothrowConstructor: return "__has_nothrow_constructor";
1130  case UTT_HasTrivialAssign:      return "__has_trivial_assign";
1131  case UTT_HasTrivialCopy:        return "__has_trivial_copy";
1132  case UTT_HasTrivialConstructor: return "__has_trivial_constructor";
1133  case UTT_HasTrivialDestructor:  return "__has_trivial_destructor";
1134  case UTT_HasVirtualDestructor:  return "__has_virtual_destructor";
1135  case UTT_IsAbstract:            return "__is_abstract";
1136  case UTT_IsClass:               return "__is_class";
1137  case UTT_IsEmpty:               return "__is_empty";
1138  case UTT_IsEnum:                return "__is_enum";
1139  case UTT_IsPOD:                 return "__is_pod";
1140  case UTT_IsPolymorphic:         return "__is_polymorphic";
1141  case UTT_IsUnion:               return "__is_union";
1142  }
1143}
1144
1145void StmtPrinter::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
1146  OS << getTypeTraitName(E->getTrait()) << "("
1147     << E->getQueriedType().getAsString() << ")";
1148}
1149
1150// Obj-C
1151
1152void StmtPrinter::VisitObjCStringLiteral(ObjCStringLiteral *Node) {
1153  OS << "@";
1154  VisitStringLiteral(Node->getString());
1155}
1156
1157void StmtPrinter::VisitObjCEncodeExpr(ObjCEncodeExpr *Node) {
1158  OS << "@encode(" << Node->getEncodedType().getAsString() << ')';
1159}
1160
1161void StmtPrinter::VisitObjCSelectorExpr(ObjCSelectorExpr *Node) {
1162  OS << "@selector(" << Node->getSelector().getAsString() << ')';
1163}
1164
1165void StmtPrinter::VisitObjCProtocolExpr(ObjCProtocolExpr *Node) {
1166  OS << "@protocol(" << Node->getProtocol()->getNameAsString() << ')';
1167}
1168
1169void StmtPrinter::VisitObjCMessageExpr(ObjCMessageExpr *Mess) {
1170  OS << "[";
1171  Expr *receiver = Mess->getReceiver();
1172  if (receiver) PrintExpr(receiver);
1173  else OS << Mess->getClassName()->getName();
1174  OS << ' ';
1175  Selector selector = Mess->getSelector();
1176  if (selector.isUnarySelector()) {
1177    OS << selector.getIdentifierInfoForSlot(0)->getName();
1178  } else {
1179    for (unsigned i = 0, e = Mess->getNumArgs(); i != e; ++i) {
1180      if (i < selector.getNumArgs()) {
1181        if (i > 0) OS << ' ';
1182        if (selector.getIdentifierInfoForSlot(i))
1183          OS << selector.getIdentifierInfoForSlot(i)->getName() << ':';
1184        else
1185           OS << ":";
1186      }
1187      else OS << ", "; // Handle variadic methods.
1188
1189      PrintExpr(Mess->getArg(i));
1190    }
1191  }
1192  OS << "]";
1193}
1194
1195void StmtPrinter::VisitObjCSuperExpr(ObjCSuperExpr *) {
1196  OS << "super";
1197}
1198
1199void StmtPrinter::VisitBlockExpr(BlockExpr *Node) {
1200  BlockDecl *BD = Node->getBlockDecl();
1201  OS << "^";
1202
1203  const FunctionType *AFT = Node->getFunctionType();
1204
1205  if (isa<FunctionNoProtoType>(AFT)) {
1206    OS << "()";
1207  } else if (!BD->param_empty() || cast<FunctionProtoType>(AFT)->isVariadic()) {
1208    OS << '(';
1209    std::string ParamStr;
1210    for (BlockDecl::param_iterator AI = BD->param_begin(),
1211         E = BD->param_end(); AI != E; ++AI) {
1212      if (AI != BD->param_begin()) OS << ", ";
1213      ParamStr = (*AI)->getNameAsString();
1214      (*AI)->getType().getAsStringInternal(ParamStr, Policy);
1215      OS << ParamStr;
1216    }
1217
1218    const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
1219    if (FT->isVariadic()) {
1220      if (!BD->param_empty()) OS << ", ";
1221      OS << "...";
1222    }
1223    OS << ')';
1224  }
1225}
1226
1227void StmtPrinter::VisitBlockDeclRefExpr(BlockDeclRefExpr *Node) {
1228  OS << Node->getDecl()->getNameAsString();
1229}
1230//===----------------------------------------------------------------------===//
1231// Stmt method implementations
1232//===----------------------------------------------------------------------===//
1233
1234void Stmt::dumpPretty(ASTContext& Context) const {
1235  printPretty(llvm::errs(), Context, 0,
1236              PrintingPolicy(Context.getLangOptions()));
1237}
1238
1239void Stmt::printPretty(llvm::raw_ostream &OS, ASTContext& Context,
1240                       PrinterHelper* Helper,
1241                       const PrintingPolicy &Policy,
1242                       unsigned Indentation) const {
1243  if (this == 0) {
1244    OS << "<NULL>";
1245    return;
1246  }
1247
1248  if (Policy.Dump) {
1249    dump(Context.getSourceManager());
1250    return;
1251  }
1252
1253  StmtPrinter P(OS, Context, Helper, Policy, Indentation);
1254  P.Visit(const_cast<Stmt*>(this));
1255}
1256
1257//===----------------------------------------------------------------------===//
1258// PrinterHelper
1259//===----------------------------------------------------------------------===//
1260
1261// Implement virtual destructor.
1262PrinterHelper::~PrinterHelper() {}
1263