StmtPrinter.cpp revision f1d60eaf3f70975ee262852af2d6aeabd140ed58 
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::VisitObjCIvarRefExpr(ObjCIvarRefExpr *Node) {
494  if (Node->getBase()) {
495    PrintExpr(Node->getBase());
496    OS << (Node->isArrow() ? "->" : ".");
497  }
498  OS << Node->getDecl()->getNameAsString();
499}
500
501void StmtPrinter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *Node) {
502  if (Node->getBase()) {
503    PrintExpr(Node->getBase());
504    OS << ".";
505  }
506  OS << Node->getProperty()->getNameAsCString();
507}
508
509void StmtPrinter::VisitObjCKVCRefExpr(ObjCKVCRefExpr *Node) {
510  if (Node->getBase()) {
511    PrintExpr(Node->getBase());
512    OS << ".";
513  }
514  // FIXME: Setter/Getter names
515}
516
517void StmtPrinter::VisitPredefinedExpr(PredefinedExpr *Node) {
518  switch (Node->getIdentType()) {
519    default:
520      assert(0 && "unknown case");
521    case PredefinedExpr::Func:
522      OS << "__func__";
523      break;
524    case PredefinedExpr::Function:
525      OS << "__FUNCTION__";
526      break;
527    case PredefinedExpr::PrettyFunction:
528      OS << "__PRETTY_FUNCTION__";
529      break;
530  }
531}
532
533void StmtPrinter::VisitCharacterLiteral(CharacterLiteral *Node) {
534  unsigned value = Node->getValue();
535  if (Node->isWide())
536    OS << "L";
537  switch (value) {
538  case '\\':
539    OS << "'\\\\'";
540    break;
541  case '\'':
542    OS << "'\\''";
543    break;
544  case '\a':
545    // TODO: K&R: the meaning of '\\a' is different in traditional C
546    OS << "'\\a'";
547    break;
548  case '\b':
549    OS << "'\\b'";
550    break;
551  // Nonstandard escape sequence.
552  /*case '\e':
553    OS << "'\\e'";
554    break;*/
555  case '\f':
556    OS << "'\\f'";
557    break;
558  case '\n':
559    OS << "'\\n'";
560    break;
561  case '\r':
562    OS << "'\\r'";
563    break;
564  case '\t':
565    OS << "'\\t'";
566    break;
567  case '\v':
568    OS << "'\\v'";
569    break;
570  default:
571    if (value < 256 && isprint(value)) {
572      OS << "'" << (char)value << "'";
573    } else if (value < 256) {
574      OS << "'\\x" << llvm::format("%x", value) << "'";
575    } else {
576      // FIXME what to really do here?
577      OS << value;
578    }
579  }
580}
581
582void StmtPrinter::VisitIntegerLiteral(IntegerLiteral *Node) {
583  bool isSigned = Node->getType()->isSignedIntegerType();
584  OS << Node->getValue().toString(10, isSigned);
585
586  // Emit suffixes.  Integer literals are always a builtin integer type.
587  switch (Node->getType()->getAsBuiltinType()->getKind()) {
588  default: assert(0 && "Unexpected type for integer literal!");
589  case BuiltinType::Int:       break; // no suffix.
590  case BuiltinType::UInt:      OS << 'U'; break;
591  case BuiltinType::Long:      OS << 'L'; break;
592  case BuiltinType::ULong:     OS << "UL"; break;
593  case BuiltinType::LongLong:  OS << "LL"; break;
594  case BuiltinType::ULongLong: OS << "ULL"; break;
595  }
596}
597void StmtPrinter::VisitFloatingLiteral(FloatingLiteral *Node) {
598  // FIXME: print value more precisely.
599  OS << Node->getValueAsApproximateDouble();
600}
601
602void StmtPrinter::VisitImaginaryLiteral(ImaginaryLiteral *Node) {
603  PrintExpr(Node->getSubExpr());
604  OS << "i";
605}
606
607void StmtPrinter::VisitStringLiteral(StringLiteral *Str) {
608  if (Str->isWide()) OS << 'L';
609  OS << '"';
610
611  // FIXME: this doesn't print wstrings right.
612  for (unsigned i = 0, e = Str->getByteLength(); i != e; ++i) {
613    unsigned char Char = Str->getStrData()[i];
614
615    switch (Char) {
616    default:
617      if (isprint(Char))
618        OS << (char)Char;
619      else  // Output anything hard as an octal escape.
620        OS << '\\'
621        << (char)('0'+ ((Char >> 6) & 7))
622        << (char)('0'+ ((Char >> 3) & 7))
623        << (char)('0'+ ((Char >> 0) & 7));
624      break;
625    // Handle some common non-printable cases to make dumps prettier.
626    case '\\': OS << "\\\\"; break;
627    case '"': OS << "\\\""; break;
628    case '\n': OS << "\\n"; break;
629    case '\t': OS << "\\t"; break;
630    case '\a': OS << "\\a"; break;
631    case '\b': OS << "\\b"; break;
632    }
633  }
634  OS << '"';
635}
636void StmtPrinter::VisitParenExpr(ParenExpr *Node) {
637  OS << "(";
638  PrintExpr(Node->getSubExpr());
639  OS << ")";
640}
641void StmtPrinter::VisitUnaryOperator(UnaryOperator *Node) {
642  if (!Node->isPostfix()) {
643    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
644
645    // Print a space if this is an "identifier operator" like __real, or if
646    // it might be concatenated incorrectly like '+'.
647    switch (Node->getOpcode()) {
648    default: break;
649    case UnaryOperator::Real:
650    case UnaryOperator::Imag:
651    case UnaryOperator::Extension:
652      OS << ' ';
653      break;
654    case UnaryOperator::Plus:
655    case UnaryOperator::Minus:
656      if (isa<UnaryOperator>(Node->getSubExpr()))
657        OS << ' ';
658      break;
659    }
660  }
661  PrintExpr(Node->getSubExpr());
662
663  if (Node->isPostfix())
664    OS << UnaryOperator::getOpcodeStr(Node->getOpcode());
665}
666
667bool StmtPrinter::PrintOffsetOfDesignator(Expr *E) {
668  if (isa<UnaryOperator>(E)) {
669    // Base case, print the type and comma.
670    OS << E->getType().getAsString() << ", ";
671    return true;
672  } else if (ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) {
673    PrintOffsetOfDesignator(ASE->getLHS());
674    OS << "[";
675    PrintExpr(ASE->getRHS());
676    OS << "]";
677    return false;
678  } else {
679    MemberExpr *ME = cast<MemberExpr>(E);
680    bool IsFirst = PrintOffsetOfDesignator(ME->getBase());
681    OS << (IsFirst ? "" : ".") << ME->getMemberDecl()->getNameAsString();
682    return false;
683  }
684}
685
686void StmtPrinter::VisitUnaryOffsetOf(UnaryOperator *Node) {
687  OS << "__builtin_offsetof(";
688  PrintOffsetOfDesignator(Node->getSubExpr());
689  OS << ")";
690}
691
692void StmtPrinter::VisitSizeOfAlignOfExpr(SizeOfAlignOfExpr *Node) {
693  OS << (Node->isSizeOf() ? "sizeof" : "__alignof");
694  if (Node->isArgumentType())
695    OS << "(" << Node->getArgumentType().getAsString() << ")";
696  else {
697    OS << " ";
698    PrintExpr(Node->getArgumentExpr());
699  }
700}
701void StmtPrinter::VisitArraySubscriptExpr(ArraySubscriptExpr *Node) {
702  PrintExpr(Node->getLHS());
703  OS << "[";
704  PrintExpr(Node->getRHS());
705  OS << "]";
706}
707
708void StmtPrinter::VisitCallExpr(CallExpr *Call) {
709  PrintExpr(Call->getCallee());
710  OS << "(";
711  for (unsigned i = 0, e = Call->getNumArgs(); i != e; ++i) {
712    if (isa<CXXDefaultArgExpr>(Call->getArg(i))) {
713      // Don't print any defaulted arguments
714      break;
715    }
716
717    if (i) OS << ", ";
718    PrintExpr(Call->getArg(i));
719  }
720  OS << ")";
721}
722void StmtPrinter::VisitMemberExpr(MemberExpr *Node) {
723  // FIXME: Suppress printing implicit bases (like "this")
724  PrintExpr(Node->getBase());
725  OS << (Node->isArrow() ? "->" : ".");
726  // FIXME: Suppress printing references to unnamed objects
727  // representing anonymous unions/structs
728  OS << Node->getMemberDecl()->getNameAsString();
729}
730void StmtPrinter::VisitExtVectorElementExpr(ExtVectorElementExpr *Node) {
731  PrintExpr(Node->getBase());
732  OS << ".";
733  OS << Node->getAccessor().getName();
734}
735void StmtPrinter::VisitCastExpr(CastExpr *) {
736  assert(0 && "CastExpr is an abstract class");
737}
738void StmtPrinter::VisitExplicitCastExpr(ExplicitCastExpr *) {
739  assert(0 && "ExplicitCastExpr is an abstract class");
740}
741void StmtPrinter::VisitCStyleCastExpr(CStyleCastExpr *Node) {
742  OS << "(" << Node->getType().getAsString() << ")";
743  PrintExpr(Node->getSubExpr());
744}
745void StmtPrinter::VisitCompoundLiteralExpr(CompoundLiteralExpr *Node) {
746  OS << "(" << Node->getType().getAsString() << ")";
747  PrintExpr(Node->getInitializer());
748}
749void StmtPrinter::VisitImplicitCastExpr(ImplicitCastExpr *Node) {
750  // No need to print anything, simply forward to the sub expression.
751  PrintExpr(Node->getSubExpr());
752}
753void StmtPrinter::VisitBinaryOperator(BinaryOperator *Node) {
754  PrintExpr(Node->getLHS());
755  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
756  PrintExpr(Node->getRHS());
757}
758void StmtPrinter::VisitCompoundAssignOperator(CompoundAssignOperator *Node) {
759  PrintExpr(Node->getLHS());
760  OS << " " << BinaryOperator::getOpcodeStr(Node->getOpcode()) << " ";
761  PrintExpr(Node->getRHS());
762}
763void StmtPrinter::VisitConditionalOperator(ConditionalOperator *Node) {
764  PrintExpr(Node->getCond());
765
766  if (Node->getLHS()) {
767    OS << " ? ";
768    PrintExpr(Node->getLHS());
769    OS << " : ";
770  }
771  else { // Handle GCC extension where LHS can be NULL.
772    OS << " ?: ";
773  }
774
775  PrintExpr(Node->getRHS());
776}
777
778// GNU extensions.
779
780void StmtPrinter::VisitAddrLabelExpr(AddrLabelExpr *Node) {
781  OS << "&&" << Node->getLabel()->getName();
782}
783
784void StmtPrinter::VisitStmtExpr(StmtExpr *E) {
785  OS << "(";
786  PrintRawCompoundStmt(E->getSubStmt());
787  OS << ")";
788}
789
790void StmtPrinter::VisitTypesCompatibleExpr(TypesCompatibleExpr *Node) {
791  OS << "__builtin_types_compatible_p(";
792  OS << Node->getArgType1().getAsString() << ",";
793  OS << Node->getArgType2().getAsString() << ")";
794}
795
796void StmtPrinter::VisitChooseExpr(ChooseExpr *Node) {
797  OS << "__builtin_choose_expr(";
798  PrintExpr(Node->getCond());
799  OS << ", ";
800  PrintExpr(Node->getLHS());
801  OS << ", ";
802  PrintExpr(Node->getRHS());
803  OS << ")";
804}
805
806void StmtPrinter::VisitGNUNullExpr(GNUNullExpr *) {
807  OS << "__null";
808}
809
810void StmtPrinter::VisitShuffleVectorExpr(ShuffleVectorExpr *Node) {
811  OS << "__builtin_shufflevector(";
812  for (unsigned i = 0, e = Node->getNumSubExprs(); i != e; ++i) {
813    if (i) OS << ", ";
814    PrintExpr(Node->getExpr(i));
815  }
816  OS << ")";
817}
818
819void StmtPrinter::VisitInitListExpr(InitListExpr* Node) {
820  if (Node->getSyntacticForm()) {
821    Visit(Node->getSyntacticForm());
822    return;
823  }
824
825  OS << "{ ";
826  for (unsigned i = 0, e = Node->getNumInits(); i != e; ++i) {
827    if (i) OS << ", ";
828    if (Node->getInit(i))
829      PrintExpr(Node->getInit(i));
830    else
831      OS << "0";
832  }
833  OS << " }";
834}
835
836void StmtPrinter::VisitDesignatedInitExpr(DesignatedInitExpr *Node) {
837  for (DesignatedInitExpr::designators_iterator D = Node->designators_begin(),
838                      DEnd = Node->designators_end();
839       D != DEnd; ++D) {
840    if (D->isFieldDesignator()) {
841      if (D->getDotLoc().isInvalid())
842        OS << D->getFieldName()->getName() << ":";
843      else
844        OS << "." << D->getFieldName()->getName();
845    } else {
846      OS << "[";
847      if (D->isArrayDesignator()) {
848        PrintExpr(Node->getArrayIndex(*D));
849      } else {
850        PrintExpr(Node->getArrayRangeStart(*D));
851        OS << " ... ";
852        PrintExpr(Node->getArrayRangeEnd(*D));
853      }
854      OS << "]";
855    }
856  }
857
858  OS << " = ";
859  PrintExpr(Node->getInit());
860}
861
862void StmtPrinter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *Node) {
863  if (Policy.LangOpts.CPlusPlus)
864    OS << "/*implicit*/" << Node->getType().getAsString(Policy) << "()";
865  else {
866    OS << "/*implicit*/(" << Node->getType().getAsString(Policy) << ")";
867    if (Node->getType()->isRecordType())
868      OS << "{}";
869    else
870      OS << 0;
871  }
872}
873
874void StmtPrinter::VisitVAArgExpr(VAArgExpr *Node) {
875  OS << "__builtin_va_arg(";
876  PrintExpr(Node->getSubExpr());
877  OS << ", ";
878  OS << Node->getType().getAsString();
879  OS << ")";
880}
881
882// C++
883void StmtPrinter::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *Node) {
884  const char *OpStrings[NUM_OVERLOADED_OPERATORS] = {
885    "",
886#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
887    Spelling,
888#include "clang/Basic/OperatorKinds.def"
889  };
890
891  OverloadedOperatorKind Kind = Node->getOperator();
892  if (Kind == OO_PlusPlus || Kind == OO_MinusMinus) {
893    if (Node->getNumArgs() == 1) {
894      OS << OpStrings[Kind] << ' ';
895      PrintExpr(Node->getArg(0));
896    } else {
897      PrintExpr(Node->getArg(0));
898      OS << ' ' << OpStrings[Kind];
899    }
900  } else if (Kind == OO_Call) {
901    PrintExpr(Node->getArg(0));
902    OS << '(';
903    for (unsigned ArgIdx = 1; ArgIdx < Node->getNumArgs(); ++ArgIdx) {
904      if (ArgIdx > 1)
905        OS << ", ";
906      if (!isa<CXXDefaultArgExpr>(Node->getArg(ArgIdx)))
907        PrintExpr(Node->getArg(ArgIdx));
908    }
909    OS << ')';
910  } else if (Kind == OO_Subscript) {
911    PrintExpr(Node->getArg(0));
912    OS << '[';
913    PrintExpr(Node->getArg(1));
914    OS << ']';
915  } else if (Node->getNumArgs() == 1) {
916    OS << OpStrings[Kind] << ' ';
917    PrintExpr(Node->getArg(0));
918  } else if (Node->getNumArgs() == 2) {
919    PrintExpr(Node->getArg(0));
920    OS << ' ' << OpStrings[Kind] << ' ';
921    PrintExpr(Node->getArg(1));
922  } else {
923    assert(false && "unknown overloaded operator");
924  }
925}
926
927void StmtPrinter::VisitCXXMemberCallExpr(CXXMemberCallExpr *Node) {
928  VisitCallExpr(cast<CallExpr>(Node));
929}
930
931void StmtPrinter::VisitCXXNamedCastExpr(CXXNamedCastExpr *Node) {
932  OS << Node->getCastName() << '<';
933  OS << Node->getTypeAsWritten().getAsString() << ">(";
934  PrintExpr(Node->getSubExpr());
935  OS << ")";
936}
937
938void StmtPrinter::VisitCXXStaticCastExpr(CXXStaticCastExpr *Node) {
939  VisitCXXNamedCastExpr(Node);
940}
941
942void StmtPrinter::VisitCXXDynamicCastExpr(CXXDynamicCastExpr *Node) {
943  VisitCXXNamedCastExpr(Node);
944}
945
946void StmtPrinter::VisitCXXReinterpretCastExpr(CXXReinterpretCastExpr *Node) {
947  VisitCXXNamedCastExpr(Node);
948}
949
950void StmtPrinter::VisitCXXConstCastExpr(CXXConstCastExpr *Node) {
951  VisitCXXNamedCastExpr(Node);
952}
953
954void StmtPrinter::VisitCXXTypeidExpr(CXXTypeidExpr *Node) {
955  OS << "typeid(";
956  if (Node->isTypeOperand()) {
957    OS << Node->getTypeOperand().getAsString();
958  } else {
959    PrintExpr(Node->getExprOperand());
960  }
961  OS << ")";
962}
963
964void StmtPrinter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *Node) {
965  OS << (Node->getValue() ? "true" : "false");
966}
967
968void StmtPrinter::VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *Node) {
969  OS << "nullptr";
970}
971
972void StmtPrinter::VisitCXXThisExpr(CXXThisExpr *Node) {
973  OS << "this";
974}
975
976void StmtPrinter::VisitCXXThrowExpr(CXXThrowExpr *Node) {
977  if (Node->getSubExpr() == 0)
978    OS << "throw";
979  else {
980    OS << "throw ";
981    PrintExpr(Node->getSubExpr());
982  }
983}
984
985void StmtPrinter::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *Node) {
986  // Nothing to print: we picked up the default argument
987}
988
989void StmtPrinter::VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr *Node) {
990  OS << Node->getType().getAsString();
991  OS << "(";
992  PrintExpr(Node->getSubExpr());
993  OS << ")";
994}
995
996void StmtPrinter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *Node) {
997  PrintExpr(Node->getSubExpr());
998}
999
1000void StmtPrinter::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *Node) {
1001  OS << Node->getType().getAsString();
1002  OS << "(";
1003  for (CXXTemporaryObjectExpr::arg_iterator Arg = Node->arg_begin(),
1004                                         ArgEnd = Node->arg_end();
1005       Arg != ArgEnd; ++Arg) {
1006    if (Arg != Node->arg_begin())
1007      OS << ", ";
1008    PrintExpr(*Arg);
1009  }
1010  OS << ")";
1011}
1012
1013void StmtPrinter::VisitCXXZeroInitValueExpr(CXXZeroInitValueExpr *Node) {
1014  OS << Node->getType().getAsString() << "()";
1015}
1016
1017void
1018StmtPrinter::VisitCXXConditionDeclExpr(CXXConditionDeclExpr *E) {
1019  PrintRawDecl(E->getVarDecl());
1020}
1021
1022void StmtPrinter::VisitCXXNewExpr(CXXNewExpr *E) {
1023  if (E->isGlobalNew())
1024    OS << "::";
1025  OS << "new ";
1026  unsigned NumPlace = E->getNumPlacementArgs();
1027  if (NumPlace > 0) {
1028    OS << "(";
1029    PrintExpr(E->getPlacementArg(0));
1030    for (unsigned i = 1; i < NumPlace; ++i) {
1031      OS << ", ";
1032      PrintExpr(E->getPlacementArg(i));
1033    }
1034    OS << ") ";
1035  }
1036  if (E->isParenTypeId())
1037    OS << "(";
1038  std::string TypeS;
1039  if (Expr *Size = E->getArraySize()) {
1040    llvm::raw_string_ostream s(TypeS);
1041    Size->printPretty(s, Context, Helper, Policy);
1042    s.flush();
1043    TypeS = "[" + TypeS + "]";
1044  }
1045  E->getAllocatedType().getAsStringInternal(TypeS, Policy);
1046  OS << TypeS;
1047  if (E->isParenTypeId())
1048    OS << ")";
1049
1050  if (E->hasInitializer()) {
1051    OS << "(";
1052    unsigned NumCons = E->getNumConstructorArgs();
1053    if (NumCons > 0) {
1054      PrintExpr(E->getConstructorArg(0));
1055      for (unsigned i = 1; i < NumCons; ++i) {
1056        OS << ", ";
1057        PrintExpr(E->getConstructorArg(i));
1058      }
1059    }
1060    OS << ")";
1061  }
1062}
1063
1064void StmtPrinter::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1065  if (E->isGlobalDelete())
1066    OS << "::";
1067  OS << "delete ";
1068  if (E->isArrayForm())
1069    OS << "[] ";
1070  PrintExpr(E->getArgument());
1071}
1072
1073void StmtPrinter::VisitUnresolvedFunctionNameExpr(UnresolvedFunctionNameExpr *E) {
1074  OS << E->getName().getAsString();
1075}
1076
1077void StmtPrinter::VisitCXXConstructExpr(CXXConstructExpr *E) {
1078  // Nothing to print.
1079}
1080
1081void StmtPrinter::VisitCXXExprWithTemporaries(CXXExprWithTemporaries *E) {
1082  // Just forward to the sub expression.
1083  PrintExpr(E->getSubExpr());
1084}
1085
1086void
1087StmtPrinter::VisitCXXUnresolvedConstructExpr(
1088                                           CXXUnresolvedConstructExpr *Node) {
1089  OS << Node->getTypeAsWritten().getAsString();
1090  OS << "(";
1091  for (CXXUnresolvedConstructExpr::arg_iterator Arg = Node->arg_begin(),
1092                                             ArgEnd = Node->arg_end();
1093       Arg != ArgEnd; ++Arg) {
1094    if (Arg != Node->arg_begin())
1095      OS << ", ";
1096    PrintExpr(*Arg);
1097  }
1098  OS << ")";
1099}
1100
1101void StmtPrinter::VisitCXXUnresolvedMemberExpr(CXXUnresolvedMemberExpr *Node) {
1102  PrintExpr(Node->getBase());
1103  OS << (Node->isArrow() ? "->" : ".");
1104  OS << Node->getMember().getAsString();
1105}
1106
1107static const char *getTypeTraitName(UnaryTypeTrait UTT) {
1108  switch (UTT) {
1109  default: assert(false && "Unknown type trait");
1110  case UTT_HasNothrowAssign:      return "__has_nothrow_assign";
1111  case UTT_HasNothrowCopy:        return "__has_nothrow_copy";
1112  case UTT_HasNothrowConstructor: return "__has_nothrow_constructor";
1113  case UTT_HasTrivialAssign:      return "__has_trivial_assign";
1114  case UTT_HasTrivialCopy:        return "__has_trivial_copy";
1115  case UTT_HasTrivialConstructor: return "__has_trivial_constructor";
1116  case UTT_HasTrivialDestructor:  return "__has_trivial_destructor";
1117  case UTT_HasVirtualDestructor:  return "__has_virtual_destructor";
1118  case UTT_IsAbstract:            return "__is_abstract";
1119  case UTT_IsClass:               return "__is_class";
1120  case UTT_IsEmpty:               return "__is_empty";
1121  case UTT_IsEnum:                return "__is_enum";
1122  case UTT_IsPOD:                 return "__is_pod";
1123  case UTT_IsPolymorphic:         return "__is_polymorphic";
1124  case UTT_IsUnion:               return "__is_union";
1125  }
1126}
1127
1128void StmtPrinter::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
1129  OS << getTypeTraitName(E->getTrait()) << "("
1130     << E->getQueriedType().getAsString() << ")";
1131}
1132
1133// Obj-C
1134
1135void StmtPrinter::VisitObjCStringLiteral(ObjCStringLiteral *Node) {
1136  OS << "@";
1137  VisitStringLiteral(Node->getString());
1138}
1139
1140void StmtPrinter::VisitObjCEncodeExpr(ObjCEncodeExpr *Node) {
1141  OS << "@encode(" << Node->getEncodedType().getAsString() << ')';
1142}
1143
1144void StmtPrinter::VisitObjCSelectorExpr(ObjCSelectorExpr *Node) {
1145  OS << "@selector(" << Node->getSelector().getAsString() << ')';
1146}
1147
1148void StmtPrinter::VisitObjCProtocolExpr(ObjCProtocolExpr *Node) {
1149  OS << "@protocol(" << Node->getProtocol()->getNameAsString() << ')';
1150}
1151
1152void StmtPrinter::VisitObjCMessageExpr(ObjCMessageExpr *Mess) {
1153  OS << "[";
1154  Expr *receiver = Mess->getReceiver();
1155  if (receiver) PrintExpr(receiver);
1156  else OS << Mess->getClassName()->getName();
1157  OS << ' ';
1158  Selector selector = Mess->getSelector();
1159  if (selector.isUnarySelector()) {
1160    OS << selector.getIdentifierInfoForSlot(0)->getName();
1161  } else {
1162    for (unsigned i = 0, e = Mess->getNumArgs(); i != e; ++i) {
1163      if (i < selector.getNumArgs()) {
1164        if (i > 0) OS << ' ';
1165        if (selector.getIdentifierInfoForSlot(i))
1166          OS << selector.getIdentifierInfoForSlot(i)->getName() << ':';
1167        else
1168           OS << ":";
1169      }
1170      else OS << ", "; // Handle variadic methods.
1171
1172      PrintExpr(Mess->getArg(i));
1173    }
1174  }
1175  OS << "]";
1176}
1177
1178void StmtPrinter::VisitObjCSuperExpr(ObjCSuperExpr *) {
1179  OS << "super";
1180}
1181
1182void StmtPrinter::VisitBlockExpr(BlockExpr *Node) {
1183  BlockDecl *BD = Node->getBlockDecl();
1184  OS << "^";
1185
1186  const FunctionType *AFT = Node->getFunctionType();
1187
1188  if (isa<FunctionNoProtoType>(AFT)) {
1189    OS << "()";
1190  } else if (!BD->param_empty() || cast<FunctionProtoType>(AFT)->isVariadic()) {
1191    OS << '(';
1192    std::string ParamStr;
1193    for (BlockDecl::param_iterator AI = BD->param_begin(),
1194         E = BD->param_end(); AI != E; ++AI) {
1195      if (AI != BD->param_begin()) OS << ", ";
1196      ParamStr = (*AI)->getNameAsString();
1197      (*AI)->getType().getAsStringInternal(ParamStr, Policy);
1198      OS << ParamStr;
1199    }
1200
1201    const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
1202    if (FT->isVariadic()) {
1203      if (!BD->param_empty()) OS << ", ";
1204      OS << "...";
1205    }
1206    OS << ')';
1207  }
1208}
1209
1210void StmtPrinter::VisitBlockDeclRefExpr(BlockDeclRefExpr *Node) {
1211  OS << Node->getDecl()->getNameAsString();
1212}
1213//===----------------------------------------------------------------------===//
1214// Stmt method implementations
1215//===----------------------------------------------------------------------===//
1216
1217void Stmt::dumpPretty(ASTContext& Context) const {
1218  printPretty(llvm::errs(), Context, 0,
1219              PrintingPolicy(Context.getLangOptions()));
1220}
1221
1222void Stmt::printPretty(llvm::raw_ostream &OS, ASTContext& Context,
1223                       PrinterHelper* Helper,
1224                       const PrintingPolicy &Policy,
1225                       unsigned Indentation) const {
1226  if (this == 0) {
1227    OS << "<NULL>";
1228    return;
1229  }
1230
1231  if (Policy.Dump) {
1232    dump();
1233    return;
1234  }
1235
1236  StmtPrinter P(OS, Context, Helper, Policy, Indentation);
1237  P.Visit(const_cast<Stmt*>(this));
1238}
1239
1240//===----------------------------------------------------------------------===//
1241// PrinterHelper
1242//===----------------------------------------------------------------------===//
1243
1244// Implement virtual destructor.
1245PrinterHelper::~PrinterHelper() {}
1246