StmtPrinter.cpp revision 183700f494ec9b6701b6efe82bcb25f4c79ba561 
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/Format.h"
21using namespace clang;
22
23//===----------------------------------------------------------------------===//
24// StmtPrinter Visitor
25//===----------------------------------------------------------------------===//
26
27namespace  {
28  class VISIBILITY_HIDDEN StmtPrinter : public StmtVisitor<StmtPrinter> {
29    llvm::raw_ostream &OS;
30    ASTContext &Context;
31    unsigned IndentLevel;
32    clang::PrinterHelper* Helper;
33    PrintingPolicy Policy;
34
35  public:
36    StmtPrinter(llvm::raw_ostream &os, ASTContext &C, PrinterHelper* helper,
37                const PrintingPolicy &Policy,
38                unsigned Indentation = 0)
39      : OS(os), Context(C), IndentLevel(Indentation), Helper(helper),
40        Policy(Policy) {}
41
42    void PrintStmt(Stmt *S) {
43      PrintStmt(S, Policy.Indentation);
44    }
45
46    void PrintStmt(Stmt *S, int SubIndent) {
47      IndentLevel += SubIndent;
48      if (S && isa<Expr>(S)) {
49        // If this is an expr used in a stmt context, indent and newline it.
50        Indent();
51        Visit(S);
52        OS << ";\n";
53      } else if (S) {
54        Visit(S);
55      } else {
56        Indent() << "<<<NULL STATEMENT>>>\n";
57      }
58      IndentLevel -= SubIndent;
59    }
60
61    void PrintRawCompoundStmt(CompoundStmt *S);
62    void PrintRawDecl(Decl *D);
63    void PrintRawDeclStmt(DeclStmt *S);
64    void PrintRawIfStmt(IfStmt *If);
65    void PrintRawCXXCatchStmt(CXXCatchStmt *Catch);
66
67    void PrintExpr(Expr *E) {
68      if (E)
69        Visit(E);
70      else
71        OS << "<null expr>";
72    }
73
74    llvm::raw_ostream &Indent(int Delta = 0) {
75      for (int i = 0, e = IndentLevel+Delta; i < e; ++i)
76        OS << "  ";
77      return OS;
78    }
79
80    bool PrintOffsetOfDesignator(Expr *E);
81    void VisitUnaryOffsetOf(UnaryOperator *Node);
82
83    void Visit(Stmt* S) {
84      if (Helper && Helper->handledStmt(S,OS))
85          return;
86      else StmtVisitor<StmtPrinter>::Visit(S);
87    }
88
89    void VisitStmt(Stmt *Node);
90#define STMT(CLASS, PARENT) \
91    void Visit##CLASS(CLASS *Node);
92#include "clang/AST/StmtNodes.def"
93  };
94}
95
96//===----------------------------------------------------------------------===//
97//  Stmt printing methods.
98//===----------------------------------------------------------------------===//
99
100void StmtPrinter::VisitStmt(Stmt *Node) {
101  Indent() << "<<unknown stmt type>>\n";
102}
103
104/// PrintRawCompoundStmt - Print a compound stmt without indenting the {, and
105/// with no newline after the }.
106void StmtPrinter::PrintRawCompoundStmt(CompoundStmt *Node) {
107  OS << "{\n";
108  for (CompoundStmt::body_iterator I = Node->body_begin(), E = Node->body_end();
109       I != E; ++I)
110    PrintStmt(*I);
111
112  Indent() << "}";
113}
114
115void StmtPrinter::PrintRawDecl(Decl *D) {
116  D->print(OS, Policy, IndentLevel);
117}
118
119void StmtPrinter::PrintRawDeclStmt(DeclStmt *S) {
120  DeclStmt::decl_iterator Begin = S->decl_begin(), End = S->decl_end();
121  llvm::SmallVector<Decl*, 2> Decls;
122  for ( ; Begin != End; ++Begin)
123    Decls.push_back(*Begin);
124
125  Decl::printGroup(Decls.data(), Decls.size(), OS, Policy, IndentLevel);
126}
127
128void StmtPrinter::VisitNullStmt(NullStmt *Node) {
129  Indent() << ";\n";
130}
131
132void StmtPrinter::VisitDeclStmt(DeclStmt *Node) {
133  Indent();
134  PrintRawDeclStmt(Node);
135  OS << ";\n";
136}
137
138void StmtPrinter::VisitCompoundStmt(CompoundStmt *Node) {
139  Indent();
140  PrintRawCompoundStmt(Node);
141  OS << "\n";
142}
143
144void StmtPrinter::VisitCaseStmt(CaseStmt *Node) {
145  Indent(-1) << "case ";
146  PrintExpr(Node->getLHS());
147  if (Node->getRHS()) {
148    OS << " ... ";
149    PrintExpr(Node->getRHS());
150  }
151  OS << ":\n";
152
153  PrintStmt(Node->getSubStmt(), 0);
154}
155
156void StmtPrinter::VisitDefaultStmt(DefaultStmt *Node) {
157  Indent(-1) << "default:\n";
158  PrintStmt(Node->getSubStmt(), 0);
159}
160
161void StmtPrinter::VisitLabelStmt(LabelStmt *Node) {
162  Indent(-1) << Node->getName() << ":\n";
163  PrintStmt(Node->getSubStmt(), 0);
164}
165
166void StmtPrinter::PrintRawIfStmt(IfStmt *If) {
167  OS << "if (";
168  PrintExpr(If->getCond());
169  OS << ')';
170
171  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(If->getThen())) {
172    OS << ' ';
173    PrintRawCompoundStmt(CS);
174    OS << (If->getElse() ? ' ' : '\n');
175  } else {
176    OS << '\n';
177    PrintStmt(If->getThen());
178    if (If->getElse()) Indent();
179  }
180
181  if (Stmt *Else = If->getElse()) {
182    OS << "else";
183
184    if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Else)) {
185      OS << ' ';
186      PrintRawCompoundStmt(CS);
187      OS << '\n';
188    } else if (IfStmt *ElseIf = dyn_cast<IfStmt>(Else)) {
189      OS << ' ';
190      PrintRawIfStmt(ElseIf);
191    } else {
192      OS << '\n';
193      PrintStmt(If->getElse());
194    }
195  }
196}
197
198void StmtPrinter::VisitIfStmt(IfStmt *If) {
199  Indent();
200  PrintRawIfStmt(If);
201}
202
203void StmtPrinter::VisitSwitchStmt(SwitchStmt *Node) {
204  Indent() << "switch (";
205  PrintExpr(Node->getCond());
206  OS << ")";
207
208  // Pretty print compoundstmt bodies (very common).
209  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
210    OS << " ";
211    PrintRawCompoundStmt(CS);
212    OS << "\n";
213  } else {
214    OS << "\n";
215    PrintStmt(Node->getBody());
216  }
217}
218
219void StmtPrinter::VisitSwitchCase(SwitchCase*) {
220  assert(0 && "SwitchCase is an abstract class");
221}
222
223void StmtPrinter::VisitWhileStmt(WhileStmt *Node) {
224  Indent() << "while (";
225  PrintExpr(Node->getCond());
226  OS << ")\n";
227  PrintStmt(Node->getBody());
228}
229
230void StmtPrinter::VisitDoStmt(DoStmt *Node) {
231  Indent() << "do ";
232  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
233    PrintRawCompoundStmt(CS);
234    OS << " ";
235  } else {
236    OS << "\n";
237    PrintStmt(Node->getBody());
238    Indent();
239  }
240
241  OS << "while (";
242  PrintExpr(Node->getCond());
243  OS << ");\n";
244}
245
246void StmtPrinter::VisitForStmt(ForStmt *Node) {
247  Indent() << "for (";
248  if (Node->getInit()) {
249    if (DeclStmt *DS = dyn_cast<DeclStmt>(Node->getInit()))
250      PrintRawDeclStmt(DS);
251    else
252      PrintExpr(cast<Expr>(Node->getInit()));
253  }
254  OS << ";";
255  if (Node->getCond()) {
256    OS << " ";
257    PrintExpr(Node->getCond());
258  }
259  OS << ";";
260  if (Node->getInc()) {
261    OS << " ";
262    PrintExpr(Node->getInc());
263  }
264  OS << ") ";
265
266  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
267    PrintRawCompoundStmt(CS);
268    OS << "\n";
269  } else {
270    OS << "\n";
271    PrintStmt(Node->getBody());
272  }
273}
274
275void StmtPrinter::VisitObjCForCollectionStmt(ObjCForCollectionStmt *Node) {
276  Indent() << "for (";
277  if (DeclStmt *DS = dyn_cast<DeclStmt>(Node->getElement()))
278    PrintRawDeclStmt(DS);
279  else
280    PrintExpr(cast<Expr>(Node->getElement()));
281  OS << " in ";
282  PrintExpr(Node->getCollection());
283  OS << ") ";
284
285  if (CompoundStmt *CS = dyn_cast<CompoundStmt>(Node->getBody())) {
286    PrintRawCompoundStmt(CS);
287    OS << "\n";
288  } else {
289    OS << "\n";
290    PrintStmt(Node->getBody());
291  }
292}
293
294void StmtPrinter::VisitGotoStmt(GotoStmt *Node) {
295  Indent() << "goto " << Node->getLabel()->getName() << ";\n";
296}
297
298void StmtPrinter::VisitIndirectGotoStmt(IndirectGotoStmt *Node) {
299  Indent() << "goto *";
300  PrintExpr(Node->getTarget());
301  OS << ";\n";
302}
303
304void StmtPrinter::VisitContinueStmt(ContinueStmt *Node) {
305  Indent() << "continue;\n";
306}
307
308void StmtPrinter::VisitBreakStmt(BreakStmt *Node) {
309  Indent() << "break;\n";
310}
311
312
313void StmtPrinter::VisitReturnStmt(ReturnStmt *Node) {
314  Indent() << "return";
315  if (Node->getRetValue()) {
316    OS << " ";
317    PrintExpr(Node->getRetValue());
318  }
319  OS << ";\n";
320}
321
322
323void StmtPrinter::VisitAsmStmt(AsmStmt *Node) {
324  Indent() << "asm ";
325
326  if (Node->isVolatile())
327    OS << "volatile ";
328
329  OS << "(";
330  VisitStringLiteral(Node->getAsmString());
331
332  // Outputs
333  if (Node->getNumOutputs() != 0 || Node->getNumInputs() != 0 ||
334      Node->getNumClobbers() != 0)
335    OS << " : ";
336
337  for (unsigned i = 0, e = Node->getNumOutputs(); i != e; ++i) {
338    if (i != 0)
339      OS << ", ";
340
341    if (!Node->getOutputName(i).empty()) {
342      OS << '[';
343      OS << Node->getOutputName(i);
344      OS << "] ";
345    }
346
347    VisitStringLiteral(Node->getOutputConstraintLiteral(i));
348    OS << " ";
349    Visit(Node->getOutputExpr(i));
350  }
351
352  // Inputs
353  if (Node->getNumInputs() != 0 || Node->getNumClobbers() != 0)
354    OS << " : ";
355
356  for (unsigned i = 0, e = Node->getNumInputs(); i != e; ++i) {
357    if (i != 0)
358      OS << ", ";
359
360    if (!Node->getInputName(i).empty()) {
361      OS << '[';
362      OS << Node->getInputName(i);
363      OS << "] ";
364    }
365
366    VisitStringLiteral(Node->getInputConstraintLiteral(i));
367    OS << " ";
368    Visit(Node->getInputExpr(i));
369  }
370
371  // Clobbers
372  if (Node->getNumClobbers() != 0)
373    OS << " : ";
374
375  for (unsigned i = 0, e = Node->getNumClobbers(); i != e; ++i) {
376    if (i != 0)
377      OS << ", ";
378
379    VisitStringLiteral(Node->getClobber(i));
380  }
381
382  OS << ");\n";
383}
384
385void StmtPrinter::VisitObjCAtTryStmt(ObjCAtTryStmt *Node) {
386  Indent() << "@try";
387  if (CompoundStmt *TS = dyn_cast<CompoundStmt>(Node->getTryBody())) {
388    PrintRawCompoundStmt(TS);
389    OS << "\n";
390  }
391
392  for (ObjCAtCatchStmt *catchStmt =
393         static_cast<ObjCAtCatchStmt *>(Node->getCatchStmts());
394       catchStmt;
395       catchStmt =
396         static_cast<ObjCAtCatchStmt *>(catchStmt->getNextCatchStmt())) {
397    Indent() << "@catch(";
398    if (catchStmt->getCatchParamDecl()) {
399      if (Decl *DS = catchStmt->getCatchParamDecl())
400        PrintRawDecl(DS);
401    }
402    OS << ")";
403    if (CompoundStmt *CS = dyn_cast<CompoundStmt>(catchStmt->getCatchBody())) {
404      PrintRawCompoundStmt(CS);
405      OS << "\n";
406    }
407  }
408
409  if (ObjCAtFinallyStmt *FS = static_cast<ObjCAtFinallyStmt *>(
410        Node->getFinallyStmt())) {
411    Indent() << "@finally";
412    PrintRawCompoundStmt(dyn_cast<CompoundStmt>(FS->getFinallyBody()));
413    OS << "\n";
414  }
415}
416
417void StmtPrinter::VisitObjCAtFinallyStmt(ObjCAtFinallyStmt *Node) {
418}
419
420void StmtPrinter::VisitObjCAtCatchStmt (ObjCAtCatchStmt *Node) {
421  Indent() << "@catch (...) { /* todo */ } \n";
422}
423
424void StmtPrinter::VisitObjCAtThrowStmt(ObjCAtThrowStmt *Node) {
425  Indent() << "@throw";
426  if (Node->getThrowExpr()) {
427    OS << " ";
428    PrintExpr(Node->getThrowExpr());
429  }
430  OS << ";\n";
431}
432
433void StmtPrinter::VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *Node) {
434  Indent() << "@synchronized (";
435  PrintExpr(Node->getSynchExpr());
436  OS << ")";
437  PrintRawCompoundStmt(Node->getSynchBody());
438  OS << "\n";
439}
440
441void StmtPrinter::PrintRawCXXCatchStmt(CXXCatchStmt *Node) {
442  OS << "catch (";
443  if (Decl *ExDecl = Node->getExceptionDecl())
444    PrintRawDecl(ExDecl);
445  else
446    OS << "...";
447  OS << ") ";
448  PrintRawCompoundStmt(cast<CompoundStmt>(Node->getHandlerBlock()));
449}
450
451void StmtPrinter::VisitCXXCatchStmt(CXXCatchStmt *Node) {
452  Indent();
453  PrintRawCXXCatchStmt(Node);
454  OS << "\n";
455}
456
457void StmtPrinter::VisitCXXTryStmt(CXXTryStmt *Node) {
458  Indent() << "try ";
459  PrintRawCompoundStmt(Node->getTryBlock());
460  for (unsigned i = 0, e = Node->getNumHandlers(); i < e; ++i) {
461    OS << " ";
462    PrintRawCXXCatchStmt(Node->getHandler(i));
463  }
464  OS << "\n";
465}
466
467//===----------------------------------------------------------------------===//
468//  Expr printing methods.
469//===----------------------------------------------------------------------===//
470
471void StmtPrinter::VisitExpr(Expr *Node) {
472  OS << "<<unknown expr type>>";
473}
474
475void StmtPrinter::VisitDeclRefExpr(DeclRefExpr *Node) {
476  OS << Node->getDecl()->getNameAsString();
477}
478
479void StmtPrinter::VisitQualifiedDeclRefExpr(QualifiedDeclRefExpr *Node) {
480  NamedDecl *D = Node->getDecl();
481
482  Node->getQualifier()->print(OS, Policy);
483  OS << D->getNameAsString();
484}
485
486void StmtPrinter::VisitUnresolvedDeclRefExpr(UnresolvedDeclRefExpr *Node) {
487  Node->getQualifier()->print(OS, Policy);
488  OS << Node->getDeclName().getAsString();
489}
490
491void StmtPrinter::VisitTemplateIdRefExpr(TemplateIdRefExpr *Node) {
492  if (Node->getQualifier())
493    Node->getQualifier()->print(OS, Policy);
494  Node->getTemplateName().print(OS, Policy, true);
495  OS << TemplateSpecializationType::PrintTemplateArgumentList(
496                                                      Node->getTemplateArgs(),
497                                                   Node->getNumTemplateArgs(),
498                                                              Policy);
499}
500
501void StmtPrinter::VisitObjCIvarRefExpr(ObjCIvarRefExpr *Node) {
502  if (Node->getBase()) {
503    PrintExpr(Node->getBase());
504    OS << (Node->isArrow() ? "->" : ".");
505  }
506  OS << Node->getDecl()->getNameAsString();
507}
508
509void StmtPrinter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *Node) {
510  if (Node->getBase()) {
511    PrintExpr(Node->getBase());
512    OS << ".";
513  }
514  OS << Node->getProperty()->getNameAsCString();
515}
516
517void StmtPrinter::VisitObjCImplicitSetterGetterRefExpr(
518                                        ObjCImplicitSetterGetterRefExpr *Node) {
519  if (Node->getBase()) {
520    PrintExpr(Node->getBase());
521    OS << ".";
522  }
523  if (Node->getGetterMethod())
524    OS << Node->getGetterMethod()->getNameAsString();
525
526}
527
528void StmtPrinter::VisitPredefinedExpr(PredefinedExpr *Node) {
529  switch (Node->getIdentType()) {
530    default:
531      assert(0 && "unknown case");
532    case PredefinedExpr::Func:
533      OS << "__func__";
534      break;
535    case PredefinedExpr::Function:
536      OS << "__FUNCTION__";
537      break;
538    case PredefinedExpr::PrettyFunction:
539      OS << "__PRETTY_FUNCTION__";
540      break;
541  }
542}
543
544void StmtPrinter::VisitCharacterLiteral(CharacterLiteral *Node) {
545  unsigned value = Node->getValue();
546  if (Node->isWide())
547    OS << "L";
548  switch (value) {
549  case '\\':
550    OS << "'\\\\'";
551    break;
552  case '\'':
553    OS << "'\\''";
554    break;
555  case '\a':
556    // TODO: K&R: the meaning of '\\a' is different in traditional C
557    OS << "'\\a'";
558    break;
559  case '\b':
560    OS << "'\\b'";
561    break;
562  // Nonstandard escape sequence.
563  /*case '\e':
564    OS << "'\\e'";
565    break;*/
566  case '\f':
567    OS << "'\\f'";
568    break;
569  case '\n':
570    OS << "'\\n'";
571    break;
572  case '\r':
573    OS << "'\\r'";
574    break;
575  case '\t':
576    OS << "'\\t'";
577    break;
578  case '\v':
579    OS << "'\\v'";
580    break;
581  default:
582    if (value < 256 && isprint(value)) {
583      OS << "'" << (char)value << "'";
584    } else if (value < 256) {
585      OS << "'\\x" << llvm::format("%x", value) << "'";
586    } else {
587      // FIXME what to really do here?
588      OS << value;
589    }
590  }
591}
592
593void StmtPrinter::VisitIntegerLiteral(IntegerLiteral *Node) {
594  bool isSigned = Node->getType()->isSignedIntegerType();
595  OS << Node->getValue().toString(10, isSigned);
596
597  // Emit suffixes.  Integer literals are always a builtin integer type.
598  switch (Node->getType()->getAs<BuiltinType>()->getKind()) {
599  default: assert(0 && "Unexpected type for integer literal!");
600  case BuiltinType::Int:       break; // no suffix.
601  case BuiltinType::UInt:      OS << 'U'; break;
602  case BuiltinType::Long:      OS << 'L'; break;
603  case BuiltinType::ULong:     OS << "UL"; break;
604  case BuiltinType::LongLong:  OS << "LL"; break;
605  case BuiltinType::ULongLong: OS << "ULL"; break;
606  }
607}
608void StmtPrinter::VisitFloatingLiteral(FloatingLiteral *Node) {
609  // FIXME: print value more precisely.
610  OS << Node->getValueAsApproximateDouble();
611}
612
613void StmtPrinter::VisitImaginaryLiteral(ImaginaryLiteral *Node) {
614  PrintExpr(Node->getSubExpr());
615  OS << "i";
616}
617
618void StmtPrinter::VisitStringLiteral(StringLiteral *Str) {
619  if (Str->isWide()) OS << 'L';
620  OS << '"';
621
622  // FIXME: this doesn't print wstrings right.
623  for (unsigned i = 0, e = Str->getByteLength(); i != e; ++i) {
624    unsigned char Char = Str->getStrData()[i];
625
626    switch (Char) {
627    default:
628      if (isprint(Char))
629        OS << (char)Char;
630      else  // Output anything hard as an octal escape.
631        OS << '\\'
632        << (char)('0'+ ((Char >> 6) & 7))
633        << (char)('0'+ ((Char >> 3) & 7))
634        << (char)('0'+ ((Char >> 0) & 7));
635      break;
636    // Handle some common non-printable cases to make dumps prettier.
637    case '\\': OS << "\\\\"; break;
638    case '"': OS << "\\\""; break;
639    case '\n': OS << "\\n"; break;
640    case '\t': OS << "\\t"; break;
641    case '\a': OS << "\\a"; break;
642    case '\b': OS << "\\b"; break;
643    }
644  }
645  OS << '"';
646}
647void StmtPrinter::VisitParenExpr(ParenExpr *Node) {
648  OS << "(";
649  PrintExpr(Node->getSubExpr());
650  OS << ")";
651}
652void StmtPrinter::VisitUnaryOperator(UnaryOperator *Node) {
653  if (!Node->isPostfix()) {
654    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
655
656    // Print a space if this is an "identifier operator" like __real, or if
657    // it might be concatenated incorrectly like '+'.
658    switch (Node->getOpcode()) {
659    default: break;
660    case UnaryOperator::Real:
661    case UnaryOperator::Imag:
662    case UnaryOperator::Extension:
663      OS << ' ';
664      break;
665    case UnaryOperator::Plus:
666    case UnaryOperator::Minus:
667      if (isa<UnaryOperator>(Node->getSubExpr()))
668        OS << ' ';
669      break;
670    }
671  }
672  PrintExpr(Node->getSubExpr());
673
674  if (Node->isPostfix())
675    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
676}
677
678bool StmtPrinter::PrintOffsetOfDesignator(Expr *E) {
679  if (isa<UnaryOperator>(E)) {
680    // Base case, print the type and comma.
681    OS << E->getType().getAsString() << ", ";
682    return true;
683  } else if (ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) {
684    PrintOffsetOfDesignator(ASE->getLHS());
685    OS << "[";
686    PrintExpr(ASE->getRHS());
687    OS << "]";
688    return false;
689  } else {
690    MemberExpr *ME = cast<MemberExpr>(E);
691    bool IsFirst = PrintOffsetOfDesignator(ME->getBase());
692    OS << (IsFirst ? "" : ".") << ME->getMemberDecl()->getNameAsString();
693    return false;
694  }
695}
696
697void StmtPrinter::VisitUnaryOffsetOf(UnaryOperator *Node) {
698  OS << "__builtin_offsetof(";
699  PrintOffsetOfDesignator(Node->getSubExpr());
700  OS << ")";
701}
702
703void StmtPrinter::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *Node) {
704  OS << (Node->isSizeOf() ? "sizeof" : "__alignof");
705  if (Node->isArgumentType())
706    OS << "(" << Node->getArgumentType().getAsString() << ")";
707  else {
708    OS << " ";
709    PrintExpr(Node->getArgumentExpr());
710  }
711}
712void StmtPrinter::VisitArraySubscriptExpr(ArraySubscriptExpr *Node) {
713  PrintExpr(Node->getLHS());
714  OS << "[";
715  PrintExpr(Node->getRHS());
716  OS << "]";
717}
718
719void StmtPrinter::VisitCallExpr(CallExpr *Call) {
720  PrintExpr(Call->getCallee());
721  OS << "(";
722  for (unsigned i = 0, e = Call->getNumArgs(); i != e; ++i) {
723    if (isa<CXXDefaultArgExpr>(Call->getArg(i))) {
724      // Don't print any defaulted arguments
725      break;
726    }
727
728    if (i) OS << ", ";
729    PrintExpr(Call->getArg(i));
730  }
731  OS << ")";
732}
733void StmtPrinter::VisitMemberExpr(MemberExpr *Node) {
734  // FIXME: Suppress printing implicit bases (like "this")
735  PrintExpr(Node->getBase());
736  OS << (Node->isArrow() ? "->" : ".");
737  // FIXME: Suppress printing references to unnamed objects
738  // representing anonymous unions/structs
739  if (NestedNameSpecifier *Qualifier = Node->getQualifier())
740    Qualifier->print(OS, Policy);
741
742  OS << Node->getMemberDecl()->getNameAsString();
743
744  if (Node->hasExplicitTemplateArgumentList())
745    OS << TemplateSpecializationType::PrintTemplateArgumentList(
746                                                    Node->getTemplateArgs(),
747                                                    Node->getNumTemplateArgs(),
748                                                                Policy);
749}
750void StmtPrinter::VisitObjCIsaExpr(ObjCIsaExpr *Node) {
751  PrintExpr(Node->getBase());
752  OS << (Node->isArrow() ? "->isa" : ".isa");
753}
754
755void StmtPrinter::VisitExtVectorElementExpr(ExtVectorElementExpr *Node) {
756  PrintExpr(Node->getBase());
757  OS << ".";
758  OS << Node->getAccessor().getName();
759}
760void StmtPrinter::VisitCastExpr(CastExpr *) {
761  assert(0 && "CastExpr is an abstract class");
762}
763void StmtPrinter::VisitExplicitCastExpr(ExplicitCastExpr *) {
764  assert(0 && "ExplicitCastExpr is an abstract class");
765}
766void StmtPrinter::VisitCStyleCastExpr(CStyleCastExpr *Node) {
767  OS << "(" << Node->getType().getAsString() << ")";
768  PrintExpr(Node->getSubExpr());
769}
770void StmtPrinter::VisitCompoundLiteralExpr(CompoundLiteralExpr *Node) {
771  OS << "(" << Node->getType().getAsString() << ")";
772  PrintExpr(Node->getInitializer());
773}
774void StmtPrinter::VisitImplicitCastExpr(ImplicitCastExpr *Node) {
775  // No need to print anything, simply forward to the sub expression.
776  PrintExpr(Node->getSubExpr());
777}
778void StmtPrinter::VisitBinaryOperator(BinaryOperator *Node) {
779  PrintExpr(Node->getLHS());
780  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
781  PrintExpr(Node->getRHS());
782}
783void StmtPrinter::VisitCompoundAssignOperator(CompoundAssignOperator *Node) {
784  PrintExpr(Node->getLHS());
785  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
786  PrintExpr(Node->getRHS());
787}
788void StmtPrinter::VisitConditionalOperator(ConditionalOperator *Node) {
789  PrintExpr(Node->getCond());
790
791  if (Node->getLHS()) {
792    OS << " ? ";
793    PrintExpr(Node->getLHS());
794    OS << " : ";
795  }
796  else { // Handle GCC extension where LHS can be NULL.
797    OS << " ?: ";
798  }
799
800  PrintExpr(Node->getRHS());
801}
802
803// GNU extensions.
804
805void StmtPrinter::VisitAddrLabelExpr(AddrLabelExpr *Node) {
806  OS << "&&" << Node->getLabel()->getName();
807}
808
809void StmtPrinter::VisitStmtExpr(StmtExpr *E) {
810  OS << "(";
811  PrintRawCompoundStmt(E->getSubStmt());
812  OS << ")";
813}
814
815void StmtPrinter::VisitTypesCompatibleExpr(TypesCompatibleExpr *Node) {
816  OS << "__builtin_types_compatible_p(";
817  OS << Node->getArgType1().getAsString() << ",";
818  OS << Node->getArgType2().getAsString() << ")";
819}
820
821void StmtPrinter::VisitChooseExpr(ChooseExpr *Node) {
822  OS << "__builtin_choose_expr(";
823  PrintExpr(Node->getCond());
824  OS << ", ";
825  PrintExpr(Node->getLHS());
826  OS << ", ";
827  PrintExpr(Node->getRHS());
828  OS << ")";
829}
830
831void StmtPrinter::VisitGNUNullExpr(GNUNullExpr *) {
832  OS << "__null";
833}
834
835void StmtPrinter::VisitShuffleVectorExpr(ShuffleVectorExpr *Node) {
836  OS << "__builtin_shufflevector(";
837  for (unsigned i = 0, e = Node->getNumSubExprs(); i != e; ++i) {
838    if (i) OS << ", ";
839    PrintExpr(Node->getExpr(i));
840  }
841  OS << ")";
842}
843
844void StmtPrinter::VisitInitListExpr(InitListExpr* Node) {
845  if (Node->getSyntacticForm()) {
846    Visit(Node->getSyntacticForm());
847    return;
848  }
849
850  OS << "{ ";
851  for (unsigned i = 0, e = Node->getNumInits(); i != e; ++i) {
852    if (i) OS << ", ";
853    if (Node->getInit(i))
854      PrintExpr(Node->getInit(i));
855    else
856      OS << "0";
857  }
858  OS << " }";
859}
860
861void StmtPrinter::VisitParenListExpr(ParenListExpr* Node) {
862  OS << "( ";
863  for (unsigned i = 0, e = Node->getNumExprs(); i != e; ++i) {
864    if (i) OS << ", ";
865    PrintExpr(Node->getExpr(i));
866  }
867  OS << " )";
868}
869
870void StmtPrinter::VisitDesignatedInitExpr(DesignatedInitExpr *Node) {
871  for (DesignatedInitExpr::designators_iterator D = Node->designators_begin(),
872                      DEnd = Node->designators_end();
873       D != DEnd; ++D) {
874    if (D->isFieldDesignator()) {
875      if (D->getDotLoc().isInvalid())
876        OS << D->getFieldName()->getName() << ":";
877      else
878        OS << "." << D->getFieldName()->getName();
879    } else {
880      OS << "[";
881      if (D->isArrayDesignator()) {
882        PrintExpr(Node->getArrayIndex(*D));
883      } else {
884        PrintExpr(Node->getArrayRangeStart(*D));
885        OS << " ... ";
886        PrintExpr(Node->getArrayRangeEnd(*D));
887      }
888      OS << "]";
889    }
890  }
891
892  OS << " = ";
893  PrintExpr(Node->getInit());
894}
895
896void StmtPrinter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *Node) {
897  if (Policy.LangOpts.CPlusPlus)
898    OS << "/*implicit*/" << Node->getType().getAsString(Policy) << "()";
899  else {
900    OS << "/*implicit*/(" << Node->getType().getAsString(Policy) << ")";
901    if (Node->getType()->isRecordType())
902      OS << "{}";
903    else
904      OS << 0;
905  }
906}
907
908void StmtPrinter::VisitVAArgExpr(VAArgExpr *Node) {
909  OS << "__builtin_va_arg(";
910  PrintExpr(Node->getSubExpr());
911  OS << ", ";
912  OS << Node->getType().getAsString();
913  OS << ")";
914}
915
916// C++
917void StmtPrinter::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *Node) {
918  const char *OpStrings[NUM_OVERLOADED_OPERATORS] = {
919    "",
920#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
921    Spelling,
922#include "clang/Basic/OperatorKinds.def"
923  };
924
925  OverloadedOperatorKind Kind = Node->getOperator();
926  if (Kind == OO_PlusPlus || Kind == OO_MinusMinus) {
927    if (Node->getNumArgs() == 1) {
928      OS << OpStrings[Kind] << ' ';
929      PrintExpr(Node->getArg(0));
930    } else {
931      PrintExpr(Node->getArg(0));
932      OS << ' ' << OpStrings[Kind];
933    }
934  } else if (Kind == OO_Call) {
935    PrintExpr(Node->getArg(0));
936    OS << '(';
937    for (unsigned ArgIdx = 1; ArgIdx < Node->getNumArgs(); ++ArgIdx) {
938      if (ArgIdx > 1)
939        OS << ", ";
940      if (!isa<CXXDefaultArgExpr>(Node->getArg(ArgIdx)))
941        PrintExpr(Node->getArg(ArgIdx));
942    }
943    OS << ')';
944  } else if (Kind == OO_Subscript) {
945    PrintExpr(Node->getArg(0));
946    OS << '[';
947    PrintExpr(Node->getArg(1));
948    OS << ']';
949  } else if (Node->getNumArgs() == 1) {
950    OS << OpStrings[Kind] << ' ';
951    PrintExpr(Node->getArg(0));
952  } else if (Node->getNumArgs() == 2) {
953    PrintExpr(Node->getArg(0));
954    OS << ' ' << OpStrings[Kind] << ' ';
955    PrintExpr(Node->getArg(1));
956  } else {
957    assert(false && "unknown overloaded operator");
958  }
959}
960
961void StmtPrinter::VisitCXXMemberCallExpr(CXXMemberCallExpr *Node) {
962  VisitCallExpr(cast<CallExpr>(Node));
963}
964
965void StmtPrinter::VisitCXXNamedCastExpr(CXXNamedCastExpr *Node) {
966  OS << Node->getCastName() << '<';
967  OS << Node->getTypeAsWritten().getAsString() << ">(";
968  PrintExpr(Node->getSubExpr());
969  OS << ")";
970}
971
972void StmtPrinter::VisitCXXStaticCastExpr(CXXStaticCastExpr *Node) {
973  VisitCXXNamedCastExpr(Node);
974}
975
976void StmtPrinter::VisitCXXDynamicCastExpr(CXXDynamicCastExpr *Node) {
977  VisitCXXNamedCastExpr(Node);
978}
979
980void StmtPrinter::VisitCXXReinterpretCastExpr(CXXReinterpretCastExpr *Node) {
981  VisitCXXNamedCastExpr(Node);
982}
983
984void StmtPrinter::VisitCXXConstCastExpr(CXXConstCastExpr *Node) {
985  VisitCXXNamedCastExpr(Node);
986}
987
988void StmtPrinter::VisitCXXTypeidExpr(CXXTypeidExpr *Node) {
989  OS << "typeid(";
990  if (Node->isTypeOperand()) {
991    OS << Node->getTypeOperand().getAsString();
992  } else {
993    PrintExpr(Node->getExprOperand());
994  }
995  OS << ")";
996}
997
998void StmtPrinter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *Node) {
999  OS << (Node->getValue() ? "true" : "false");
1000}
1001
1002void StmtPrinter::VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *Node) {
1003  OS << "nullptr";
1004}
1005
1006void StmtPrinter::VisitCXXThisExpr(CXXThisExpr *Node) {
1007  OS << "this";
1008}
1009
1010void StmtPrinter::VisitCXXThrowExpr(CXXThrowExpr *Node) {
1011  if (Node->getSubExpr() == 0)
1012    OS << "throw";
1013  else {
1014    OS << "throw ";
1015    PrintExpr(Node->getSubExpr());
1016  }
1017}
1018
1019void StmtPrinter::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *Node) {
1020  // Nothing to print: we picked up the default argument
1021}
1022
1023void StmtPrinter::VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr *Node) {
1024  OS << Node->getType().getAsString();
1025  OS << "(";
1026  PrintExpr(Node->getSubExpr());
1027  OS << ")";
1028}
1029
1030void StmtPrinter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *Node) {
1031  PrintExpr(Node->getSubExpr());
1032}
1033
1034void StmtPrinter::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *Node) {
1035  OS << Node->getType().getAsString();
1036  OS << "(";
1037  for (CXXTemporaryObjectExpr::arg_iterator Arg = Node->arg_begin(),
1038                                         ArgEnd = Node->arg_end();
1039       Arg != ArgEnd; ++Arg) {
1040    if (Arg != Node->arg_begin())
1041      OS << ", ";
1042    PrintExpr(*Arg);
1043  }
1044  OS << ")";
1045}
1046
1047void StmtPrinter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *Node) {
1048  OS << Node->getType().getAsString() << "()";
1049}
1050
1051void
1052StmtPrinter::VisitCXXConditionDeclExpr(CXXConditionDeclExpr *E) {
1053  PrintRawDecl(E->getVarDecl());
1054}
1055
1056void StmtPrinter::VisitCXXNewExpr(CXXNewExpr *E) {
1057  if (E->isGlobalNew())
1058    OS << "::";
1059  OS << "new ";
1060  unsigned NumPlace = E->getNumPlacementArgs();
1061  if (NumPlace > 0) {
1062    OS << "(";
1063    PrintExpr(E->getPlacementArg(0));
1064    for (unsigned i = 1; i < NumPlace; ++i) {
1065      OS << ", ";
1066      PrintExpr(E->getPlacementArg(i));
1067    }
1068    OS << ") ";
1069  }
1070  if (E->isParenTypeId())
1071    OS << "(";
1072  std::string TypeS;
1073  if (Expr *Size = E->getArraySize()) {
1074    llvm::raw_string_ostream s(TypeS);
1075    Size->printPretty(s, Context, Helper, Policy);
1076    s.flush();
1077    TypeS = "[" + TypeS + "]";
1078  }
1079  E->getAllocatedType().getAsStringInternal(TypeS, Policy);
1080  OS << TypeS;
1081  if (E->isParenTypeId())
1082    OS << ")";
1083
1084  if (E->hasInitializer()) {
1085    OS << "(";
1086    unsigned NumCons = E->getNumConstructorArgs();
1087    if (NumCons > 0) {
1088      PrintExpr(E->getConstructorArg(0));
1089      for (unsigned i = 1; i < NumCons; ++i) {
1090        OS << ", ";
1091        PrintExpr(E->getConstructorArg(i));
1092      }
1093    }
1094    OS << ")";
1095  }
1096}
1097
1098void StmtPrinter::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1099  if (E->isGlobalDelete())
1100    OS << "::";
1101  OS << "delete ";
1102  if (E->isArrayForm())
1103    OS << "[] ";
1104  PrintExpr(E->getArgument());
1105}
1106
1107void StmtPrinter::VisitCXXPseudoDestructorExpr(CXXPseudoDestructorExpr *E) {
1108  PrintExpr(E->getBase());
1109  if (E->isArrow())
1110    OS << "->";
1111  else
1112    OS << '.';
1113  if (E->getQualifier())
1114    E->getQualifier()->print(OS, Policy);
1115
1116  std::string TypeS;
1117  E->getDestroyedType().getAsStringInternal(TypeS, Policy);
1118  OS << TypeS;
1119}
1120
1121void StmtPrinter::VisitUnresolvedFunctionNameExpr(UnresolvedFunctionNameExpr *E) {
1122  OS << E->getName().getAsString();
1123}
1124
1125void StmtPrinter::VisitCXXConstructExpr(CXXConstructExpr *E) {
1126  // Nothing to print.
1127}
1128
1129void StmtPrinter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
1130  // Just forward to the sub expression.
1131  PrintExpr(E->getSubExpr());
1132}
1133
1134void
1135StmtPrinter::VisitCXXUnresolvedConstructExpr(
1136                                           CXXUnresolvedConstructExpr *Node) {
1137  OS << Node->getTypeAsWritten().getAsString();
1138  OS << "(";
1139  for (CXXUnresolvedConstructExpr::arg_iterator Arg = Node->arg_begin(),
1140                                             ArgEnd = Node->arg_end();
1141       Arg != ArgEnd; ++Arg) {
1142    if (Arg != Node->arg_begin())
1143      OS << ", ";
1144    PrintExpr(*Arg);
1145  }
1146  OS << ")";
1147}
1148
1149void StmtPrinter::VisitCXXUnresolvedMemberExpr(CXXUnresolvedMemberExpr *Node) {
1150  PrintExpr(Node->getBase());
1151  OS << (Node->isArrow() ? "->" : ".");
1152  if (NestedNameSpecifier *Qualifier = Node->getQualifier())
1153    Qualifier->print(OS, Policy);
1154  else if (Node->hasExplicitTemplateArgumentList())
1155    // FIXME: Track use of "template" keyword explicitly?
1156    OS << "template ";
1157
1158  OS << Node->getMember().getAsString();
1159
1160  if (Node->hasExplicitTemplateArgumentList()) {
1161    OS << TemplateSpecializationType::PrintTemplateArgumentList(
1162                                                    Node->getTemplateArgs(),
1163                                                    Node->getNumTemplateArgs(),
1164                                                    Policy);
1165  }
1166}
1167
1168static const char *getTypeTraitName(UnaryTypeTrait UTT) {
1169  switch (UTT) {
1170  default: assert(false && "Unknown type trait");
1171  case UTT_HasNothrowAssign:      return "__has_nothrow_assign";
1172  case UTT_HasNothrowCopy:        return "__has_nothrow_copy";
1173  case UTT_HasNothrowConstructor: return "__has_nothrow_constructor";
1174  case UTT_HasTrivialAssign:      return "__has_trivial_assign";
1175  case UTT_HasTrivialCopy:        return "__has_trivial_copy";
1176  case UTT_HasTrivialConstructor: return "__has_trivial_constructor";
1177  case UTT_HasTrivialDestructor:  return "__has_trivial_destructor";
1178  case UTT_HasVirtualDestructor:  return "__has_virtual_destructor";
1179  case UTT_IsAbstract:            return "__is_abstract";
1180  case UTT_IsClass:               return "__is_class";
1181  case UTT_IsEmpty:               return "__is_empty";
1182  case UTT_IsEnum:                return "__is_enum";
1183  case UTT_IsPOD:                 return "__is_pod";
1184  case UTT_IsPolymorphic:         return "__is_polymorphic";
1185  case UTT_IsUnion:               return "__is_union";
1186  }
1187}
1188
1189void StmtPrinter::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
1190  OS << getTypeTraitName(E->getTrait()) << "("
1191     << E->getQueriedType().getAsString() << ")";
1192}
1193
1194// Obj-C
1195
1196void StmtPrinter::VisitObjCStringLiteral(ObjCStringLiteral *Node) {
1197  OS << "@";
1198  VisitStringLiteral(Node->getString());
1199}
1200
1201void StmtPrinter::VisitObjCEncodeExpr(ObjCEncodeExpr *Node) {
1202  OS << "@encode(" << Node->getEncodedType().getAsString() << ')';
1203}
1204
1205void StmtPrinter::VisitObjCSelectorExpr(ObjCSelectorExpr *Node) {
1206  OS << "@selector(" << Node->getSelector().getAsString() << ')';
1207}
1208
1209void StmtPrinter::VisitObjCProtocolExpr(ObjCProtocolExpr *Node) {
1210  OS << "@protocol(" << Node->getProtocol()->getNameAsString() << ')';
1211}
1212
1213void StmtPrinter::VisitObjCMessageExpr(ObjCMessageExpr *Mess) {
1214  OS << "[";
1215  Expr *receiver = Mess->getReceiver();
1216  if (receiver) PrintExpr(receiver);
1217  else OS << Mess->getClassName()->getName();
1218  OS << ' ';
1219  Selector selector = Mess->getSelector();
1220  if (selector.isUnarySelector()) {
1221    OS << selector.getIdentifierInfoForSlot(0)->getName();
1222  } else {
1223    for (unsigned i = 0, e = Mess->getNumArgs(); i != e; ++i) {
1224      if (i < selector.getNumArgs()) {
1225        if (i > 0) OS << ' ';
1226        if (selector.getIdentifierInfoForSlot(i))
1227          OS << selector.getIdentifierInfoForSlot(i)->getName() << ':';
1228        else
1229           OS << ":";
1230      }
1231      else OS << ", "; // Handle variadic methods.
1232
1233      PrintExpr(Mess->getArg(i));
1234    }
1235  }
1236  OS << "]";
1237}
1238
1239void StmtPrinter::VisitObjCSuperExpr(ObjCSuperExpr *) {
1240  OS << "super";
1241}
1242
1243void StmtPrinter::VisitBlockExpr(BlockExpr *Node) {
1244  BlockDecl *BD = Node->getBlockDecl();
1245  OS << "^";
1246
1247  const FunctionType *AFT = Node->getFunctionType();
1248
1249  if (isa<FunctionNoProtoType>(AFT)) {
1250    OS << "()";
1251  } else if (!BD->param_empty() || cast<FunctionProtoType>(AFT)->isVariadic()) {
1252    OS << '(';
1253    std::string ParamStr;
1254    for (BlockDecl::param_iterator AI = BD->param_begin(),
1255         E = BD->param_end(); AI != E; ++AI) {
1256      if (AI != BD->param_begin()) OS << ", ";
1257      ParamStr = (*AI)->getNameAsString();
1258      (*AI)->getType().getAsStringInternal(ParamStr, Policy);
1259      OS << ParamStr;
1260    }
1261
1262    const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
1263    if (FT->isVariadic()) {
1264      if (!BD->param_empty()) OS << ", ";
1265      OS << "...";
1266    }
1267    OS << ')';
1268  }
1269}
1270
1271void StmtPrinter::VisitBlockDeclRefExpr(BlockDeclRefExpr *Node) {
1272  OS << Node->getDecl()->getNameAsString();
1273}
1274//===----------------------------------------------------------------------===//
1275// Stmt method implementations
1276//===----------------------------------------------------------------------===//
1277
1278void Stmt::dumpPretty(ASTContext& Context) const {
1279  printPretty(llvm::errs(), Context, 0,
1280              PrintingPolicy(Context.getLangOptions()));
1281}
1282
1283void Stmt::printPretty(llvm::raw_ostream &OS, ASTContext& Context,
1284                       PrinterHelper* Helper,
1285                       const PrintingPolicy &Policy,
1286                       unsigned Indentation) const {
1287  if (this == 0) {
1288    OS << "<NULL>";
1289    return;
1290  }
1291
1292  if (Policy.Dump) {
1293    dump(Context.getSourceManager());
1294    return;
1295  }
1296
1297  StmtPrinter P(OS, Context, Helper, Policy, Indentation);
1298  P.Visit(const_cast<Stmt*>(this));
1299}
1300
1301//===----------------------------------------------------------------------===//
1302// PrinterHelper
1303//===----------------------------------------------------------------------===//
1304
1305// Implement virtual destructor.
1306PrinterHelper::~PrinterHelper() {}
1307