1 //===--- ASTWriterStmt.cpp - Statement and Expression Serialization -------===//
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 serialization for Statements and Expressions.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/Serialization/ASTWriter.h"
15 #include "clang/AST/DeclCXX.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/AST/StmtVisitor.h"
19 #include "llvm/Bitcode/BitstreamWriter.h"
20 using namespace clang;
21 
22 //===----------------------------------------------------------------------===//
23 // Statement/expression serialization
24 //===----------------------------------------------------------------------===//
25 
26 namespace clang {
27   class ASTStmtWriter : public StmtVisitor<ASTStmtWriter, void> {
28     ASTWriter &Writer;
29     ASTWriter::RecordData &Record;
30 
31   public:
32     serialization::StmtCode Code;
33     unsigned AbbrevToUse;
34 
35     ASTStmtWriter(ASTWriter &Writer, ASTWriter::RecordData &Record)
36       : Writer(Writer), Record(Record) { }
37 
38     void AddTemplateKWAndArgsInfo(const ASTTemplateKWAndArgsInfo &Args);
39 
40     void VisitStmt(Stmt *S);
41 #define STMT(Type, Base) \
42     void Visit##Type(Type *);
43 #include "clang/AST/StmtNodes.inc"
44   };
45 }
46 
47 void ASTStmtWriter::
48 AddTemplateKWAndArgsInfo(const ASTTemplateKWAndArgsInfo &Args) {
49   Writer.AddSourceLocation(Args.getTemplateKeywordLoc(), Record);
50   Writer.AddSourceLocation(Args.LAngleLoc, Record);
51   Writer.AddSourceLocation(Args.RAngleLoc, Record);
52   for (unsigned i=0; i != Args.NumTemplateArgs; ++i)
53     Writer.AddTemplateArgumentLoc(Args.getTemplateArgs()[i], Record);
54 }
55 
56 void ASTStmtWriter::VisitStmt(Stmt *S) {
57 }
58 
59 void ASTStmtWriter::VisitNullStmt(NullStmt *S) {
60   VisitStmt(S);
61   Writer.AddSourceLocation(S->getSemiLoc(), Record);
62   Record.push_back(S->HasLeadingEmptyMacro);
63   Code = serialization::STMT_NULL;
64 }
65 
66 void ASTStmtWriter::VisitCompoundStmt(CompoundStmt *S) {
67   VisitStmt(S);
68   Record.push_back(S->size());
69   for (CompoundStmt::body_iterator CS = S->body_begin(), CSEnd = S->body_end();
70        CS != CSEnd; ++CS)
71     Writer.AddStmt(*CS);
72   Writer.AddSourceLocation(S->getLBracLoc(), Record);
73   Writer.AddSourceLocation(S->getRBracLoc(), Record);
74   Code = serialization::STMT_COMPOUND;
75 }
76 
77 void ASTStmtWriter::VisitSwitchCase(SwitchCase *S) {
78   VisitStmt(S);
79   Record.push_back(Writer.getSwitchCaseID(S));
80 }
81 
82 void ASTStmtWriter::VisitCaseStmt(CaseStmt *S) {
83   VisitSwitchCase(S);
84   Writer.AddStmt(S->getLHS());
85   Writer.AddStmt(S->getRHS());
86   Writer.AddStmt(S->getSubStmt());
87   Writer.AddSourceLocation(S->getCaseLoc(), Record);
88   Writer.AddSourceLocation(S->getEllipsisLoc(), Record);
89   Writer.AddSourceLocation(S->getColonLoc(), Record);
90   Code = serialization::STMT_CASE;
91 }
92 
93 void ASTStmtWriter::VisitDefaultStmt(DefaultStmt *S) {
94   VisitSwitchCase(S);
95   Writer.AddStmt(S->getSubStmt());
96   Writer.AddSourceLocation(S->getDefaultLoc(), Record);
97   Writer.AddSourceLocation(S->getColonLoc(), Record);
98   Code = serialization::STMT_DEFAULT;
99 }
100 
101 void ASTStmtWriter::VisitLabelStmt(LabelStmt *S) {
102   VisitStmt(S);
103   Writer.AddDeclRef(S->getDecl(), Record);
104   Writer.AddStmt(S->getSubStmt());
105   Writer.AddSourceLocation(S->getIdentLoc(), Record);
106   Code = serialization::STMT_LABEL;
107 }
108 
109 void ASTStmtWriter::VisitIfStmt(IfStmt *S) {
110   VisitStmt(S);
111   Writer.AddDeclRef(S->getConditionVariable(), Record);
112   Writer.AddStmt(S->getCond());
113   Writer.AddStmt(S->getThen());
114   Writer.AddStmt(S->getElse());
115   Writer.AddSourceLocation(S->getIfLoc(), Record);
116   Writer.AddSourceLocation(S->getElseLoc(), Record);
117   Code = serialization::STMT_IF;
118 }
119 
120 void ASTStmtWriter::VisitSwitchStmt(SwitchStmt *S) {
121   VisitStmt(S);
122   Writer.AddDeclRef(S->getConditionVariable(), Record);
123   Writer.AddStmt(S->getCond());
124   Writer.AddStmt(S->getBody());
125   Writer.AddSourceLocation(S->getSwitchLoc(), Record);
126   Record.push_back(S->isAllEnumCasesCovered());
127   for (SwitchCase *SC = S->getSwitchCaseList(); SC;
128        SC = SC->getNextSwitchCase())
129     Record.push_back(Writer.RecordSwitchCaseID(SC));
130   Code = serialization::STMT_SWITCH;
131 }
132 
133 void ASTStmtWriter::VisitWhileStmt(WhileStmt *S) {
134   VisitStmt(S);
135   Writer.AddDeclRef(S->getConditionVariable(), Record);
136   Writer.AddStmt(S->getCond());
137   Writer.AddStmt(S->getBody());
138   Writer.AddSourceLocation(S->getWhileLoc(), Record);
139   Code = serialization::STMT_WHILE;
140 }
141 
142 void ASTStmtWriter::VisitDoStmt(DoStmt *S) {
143   VisitStmt(S);
144   Writer.AddStmt(S->getCond());
145   Writer.AddStmt(S->getBody());
146   Writer.AddSourceLocation(S->getDoLoc(), Record);
147   Writer.AddSourceLocation(S->getWhileLoc(), Record);
148   Writer.AddSourceLocation(S->getRParenLoc(), Record);
149   Code = serialization::STMT_DO;
150 }
151 
152 void ASTStmtWriter::VisitForStmt(ForStmt *S) {
153   VisitStmt(S);
154   Writer.AddStmt(S->getInit());
155   Writer.AddStmt(S->getCond());
156   Writer.AddDeclRef(S->getConditionVariable(), Record);
157   Writer.AddStmt(S->getInc());
158   Writer.AddStmt(S->getBody());
159   Writer.AddSourceLocation(S->getForLoc(), Record);
160   Writer.AddSourceLocation(S->getLParenLoc(), Record);
161   Writer.AddSourceLocation(S->getRParenLoc(), Record);
162   Code = serialization::STMT_FOR;
163 }
164 
165 void ASTStmtWriter::VisitGotoStmt(GotoStmt *S) {
166   VisitStmt(S);
167   Writer.AddDeclRef(S->getLabel(), Record);
168   Writer.AddSourceLocation(S->getGotoLoc(), Record);
169   Writer.AddSourceLocation(S->getLabelLoc(), Record);
170   Code = serialization::STMT_GOTO;
171 }
172 
173 void ASTStmtWriter::VisitIndirectGotoStmt(IndirectGotoStmt *S) {
174   VisitStmt(S);
175   Writer.AddSourceLocation(S->getGotoLoc(), Record);
176   Writer.AddSourceLocation(S->getStarLoc(), Record);
177   Writer.AddStmt(S->getTarget());
178   Code = serialization::STMT_INDIRECT_GOTO;
179 }
180 
181 void ASTStmtWriter::VisitContinueStmt(ContinueStmt *S) {
182   VisitStmt(S);
183   Writer.AddSourceLocation(S->getContinueLoc(), Record);
184   Code = serialization::STMT_CONTINUE;
185 }
186 
187 void ASTStmtWriter::VisitBreakStmt(BreakStmt *S) {
188   VisitStmt(S);
189   Writer.AddSourceLocation(S->getBreakLoc(), Record);
190   Code = serialization::STMT_BREAK;
191 }
192 
193 void ASTStmtWriter::VisitReturnStmt(ReturnStmt *S) {
194   VisitStmt(S);
195   Writer.AddStmt(S->getRetValue());
196   Writer.AddSourceLocation(S->getReturnLoc(), Record);
197   Writer.AddDeclRef(S->getNRVOCandidate(), Record);
198   Code = serialization::STMT_RETURN;
199 }
200 
201 void ASTStmtWriter::VisitDeclStmt(DeclStmt *S) {
202   VisitStmt(S);
203   Writer.AddSourceLocation(S->getStartLoc(), Record);
204   Writer.AddSourceLocation(S->getEndLoc(), Record);
205   DeclGroupRef DG = S->getDeclGroup();
206   for (DeclGroupRef::iterator D = DG.begin(), DEnd = DG.end(); D != DEnd; ++D)
207     Writer.AddDeclRef(*D, Record);
208   Code = serialization::STMT_DECL;
209 }
210 
211 void ASTStmtWriter::VisitAsmStmt(AsmStmt *S) {
212   VisitStmt(S);
213   Record.push_back(S->getNumOutputs());
214   Record.push_back(S->getNumInputs());
215   Record.push_back(S->getNumClobbers());
216   Writer.AddSourceLocation(S->getAsmLoc(), Record);
217   Writer.AddSourceLocation(S->getRParenLoc(), Record);
218   Record.push_back(S->isVolatile());
219   Record.push_back(S->isSimple());
220   Record.push_back(S->isMSAsm());
221   Writer.AddStmt(S->getAsmString());
222 
223   // Outputs
224   for (unsigned I = 0, N = S->getNumOutputs(); I != N; ++I) {
225     Writer.AddIdentifierRef(S->getOutputIdentifier(I), Record);
226     Writer.AddStmt(S->getOutputConstraintLiteral(I));
227     Writer.AddStmt(S->getOutputExpr(I));
228   }
229 
230   // Inputs
231   for (unsigned I = 0, N = S->getNumInputs(); I != N; ++I) {
232     Writer.AddIdentifierRef(S->getInputIdentifier(I), Record);
233     Writer.AddStmt(S->getInputConstraintLiteral(I));
234     Writer.AddStmt(S->getInputExpr(I));
235   }
236 
237   // Clobbers
238   for (unsigned I = 0, N = S->getNumClobbers(); I != N; ++I)
239     Writer.AddStmt(S->getClobber(I));
240 
241   Code = serialization::STMT_ASM;
242 }
243 
244 void ASTStmtWriter::VisitExpr(Expr *E) {
245   VisitStmt(E);
246   Writer.AddTypeRef(E->getType(), Record);
247   Record.push_back(E->isTypeDependent());
248   Record.push_back(E->isValueDependent());
249   Record.push_back(E->isInstantiationDependent());
250   Record.push_back(E->containsUnexpandedParameterPack());
251   Record.push_back(E->getValueKind());
252   Record.push_back(E->getObjectKind());
253 }
254 
255 void ASTStmtWriter::VisitPredefinedExpr(PredefinedExpr *E) {
256   VisitExpr(E);
257   Writer.AddSourceLocation(E->getLocation(), Record);
258   Record.push_back(E->getIdentType()); // FIXME: stable encoding
259   Code = serialization::EXPR_PREDEFINED;
260 }
261 
262 void ASTStmtWriter::VisitDeclRefExpr(DeclRefExpr *E) {
263   VisitExpr(E);
264 
265   Record.push_back(E->hasQualifier());
266   Record.push_back(E->getDecl() != E->getFoundDecl());
267   Record.push_back(E->hasTemplateKWAndArgsInfo());
268   Record.push_back(E->hadMultipleCandidates());
269 
270   if (E->hasTemplateKWAndArgsInfo()) {
271     unsigned NumTemplateArgs = E->getNumTemplateArgs();
272     Record.push_back(NumTemplateArgs);
273   }
274 
275   DeclarationName::NameKind nk = (E->getDecl()->getDeclName().getNameKind());
276 
277   if ((!E->hasTemplateKWAndArgsInfo()) && (!E->hasQualifier()) &&
278       (E->getDecl() == E->getFoundDecl()) &&
279       nk == DeclarationName::Identifier) {
280     AbbrevToUse = Writer.getDeclRefExprAbbrev();
281   }
282 
283   if (E->hasQualifier())
284     Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
285 
286   if (E->getDecl() != E->getFoundDecl())
287     Writer.AddDeclRef(E->getFoundDecl(), Record);
288 
289   if (E->hasTemplateKWAndArgsInfo())
290     AddTemplateKWAndArgsInfo(*E->getTemplateKWAndArgsInfo());
291 
292   Writer.AddDeclRef(E->getDecl(), Record);
293   Writer.AddSourceLocation(E->getLocation(), Record);
294   Writer.AddDeclarationNameLoc(E->DNLoc, E->getDecl()->getDeclName(), Record);
295   Code = serialization::EXPR_DECL_REF;
296 }
297 
298 void ASTStmtWriter::VisitIntegerLiteral(IntegerLiteral *E) {
299   VisitExpr(E);
300   Writer.AddSourceLocation(E->getLocation(), Record);
301   Writer.AddAPInt(E->getValue(), Record);
302 
303   if (E->getValue().getBitWidth() == 32) {
304     AbbrevToUse = Writer.getIntegerLiteralAbbrev();
305   }
306 
307   Code = serialization::EXPR_INTEGER_LITERAL;
308 }
309 
310 void ASTStmtWriter::VisitFloatingLiteral(FloatingLiteral *E) {
311   VisitExpr(E);
312   Writer.AddAPFloat(E->getValue(), Record);
313   Record.push_back(E->isExact());
314   Writer.AddSourceLocation(E->getLocation(), Record);
315   Code = serialization::EXPR_FLOATING_LITERAL;
316 }
317 
318 void ASTStmtWriter::VisitImaginaryLiteral(ImaginaryLiteral *E) {
319   VisitExpr(E);
320   Writer.AddStmt(E->getSubExpr());
321   Code = serialization::EXPR_IMAGINARY_LITERAL;
322 }
323 
324 void ASTStmtWriter::VisitStringLiteral(StringLiteral *E) {
325   VisitExpr(E);
326   Record.push_back(E->getByteLength());
327   Record.push_back(E->getNumConcatenated());
328   Record.push_back(E->getKind());
329   Record.push_back(E->isPascal());
330   // FIXME: String data should be stored as a blob at the end of the
331   // StringLiteral. However, we can't do so now because we have no
332   // provision for coping with abbreviations when we're jumping around
333   // the AST file during deserialization.
334   Record.append(E->getBytes().begin(), E->getBytes().end());
335   for (unsigned I = 0, N = E->getNumConcatenated(); I != N; ++I)
336     Writer.AddSourceLocation(E->getStrTokenLoc(I), Record);
337   Code = serialization::EXPR_STRING_LITERAL;
338 }
339 
340 void ASTStmtWriter::VisitCharacterLiteral(CharacterLiteral *E) {
341   VisitExpr(E);
342   Record.push_back(E->getValue());
343   Writer.AddSourceLocation(E->getLocation(), Record);
344   Record.push_back(E->getKind());
345 
346   AbbrevToUse = Writer.getCharacterLiteralAbbrev();
347 
348   Code = serialization::EXPR_CHARACTER_LITERAL;
349 }
350 
351 void ASTStmtWriter::VisitParenExpr(ParenExpr *E) {
352   VisitExpr(E);
353   Writer.AddSourceLocation(E->getLParen(), Record);
354   Writer.AddSourceLocation(E->getRParen(), Record);
355   Writer.AddStmt(E->getSubExpr());
356   Code = serialization::EXPR_PAREN;
357 }
358 
359 void ASTStmtWriter::VisitParenListExpr(ParenListExpr *E) {
360   VisitExpr(E);
361   Record.push_back(E->NumExprs);
362   for (unsigned i=0; i != E->NumExprs; ++i)
363     Writer.AddStmt(E->Exprs[i]);
364   Writer.AddSourceLocation(E->LParenLoc, Record);
365   Writer.AddSourceLocation(E->RParenLoc, Record);
366   Code = serialization::EXPR_PAREN_LIST;
367 }
368 
369 void ASTStmtWriter::VisitUnaryOperator(UnaryOperator *E) {
370   VisitExpr(E);
371   Writer.AddStmt(E->getSubExpr());
372   Record.push_back(E->getOpcode()); // FIXME: stable encoding
373   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
374   Code = serialization::EXPR_UNARY_OPERATOR;
375 }
376 
377 void ASTStmtWriter::VisitOffsetOfExpr(OffsetOfExpr *E) {
378   VisitExpr(E);
379   Record.push_back(E->getNumComponents());
380   Record.push_back(E->getNumExpressions());
381   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
382   Writer.AddSourceLocation(E->getRParenLoc(), Record);
383   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
384   for (unsigned I = 0, N = E->getNumComponents(); I != N; ++I) {
385     const OffsetOfExpr::OffsetOfNode &ON = E->getComponent(I);
386     Record.push_back(ON.getKind()); // FIXME: Stable encoding
387     Writer.AddSourceLocation(ON.getSourceRange().getBegin(), Record);
388     Writer.AddSourceLocation(ON.getSourceRange().getEnd(), Record);
389     switch (ON.getKind()) {
390     case OffsetOfExpr::OffsetOfNode::Array:
391       Record.push_back(ON.getArrayExprIndex());
392       break;
393 
394     case OffsetOfExpr::OffsetOfNode::Field:
395       Writer.AddDeclRef(ON.getField(), Record);
396       break;
397 
398     case OffsetOfExpr::OffsetOfNode::Identifier:
399       Writer.AddIdentifierRef(ON.getFieldName(), Record);
400       break;
401 
402     case OffsetOfExpr::OffsetOfNode::Base:
403       Writer.AddCXXBaseSpecifier(*ON.getBase(), Record);
404       break;
405     }
406   }
407   for (unsigned I = 0, N = E->getNumExpressions(); I != N; ++I)
408     Writer.AddStmt(E->getIndexExpr(I));
409   Code = serialization::EXPR_OFFSETOF;
410 }
411 
412 void ASTStmtWriter::VisitUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *E) {
413   VisitExpr(E);
414   Record.push_back(E->getKind());
415   if (E->isArgumentType())
416     Writer.AddTypeSourceInfo(E->getArgumentTypeInfo(), Record);
417   else {
418     Record.push_back(0);
419     Writer.AddStmt(E->getArgumentExpr());
420   }
421   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
422   Writer.AddSourceLocation(E->getRParenLoc(), Record);
423   Code = serialization::EXPR_SIZEOF_ALIGN_OF;
424 }
425 
426 void ASTStmtWriter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
427   VisitExpr(E);
428   Writer.AddStmt(E->getLHS());
429   Writer.AddStmt(E->getRHS());
430   Writer.AddSourceLocation(E->getRBracketLoc(), Record);
431   Code = serialization::EXPR_ARRAY_SUBSCRIPT;
432 }
433 
434 void ASTStmtWriter::VisitCallExpr(CallExpr *E) {
435   VisitExpr(E);
436   Record.push_back(E->getNumArgs());
437   Writer.AddSourceLocation(E->getRParenLoc(), Record);
438   Writer.AddStmt(E->getCallee());
439   for (CallExpr::arg_iterator Arg = E->arg_begin(), ArgEnd = E->arg_end();
440        Arg != ArgEnd; ++Arg)
441     Writer.AddStmt(*Arg);
442   Code = serialization::EXPR_CALL;
443 }
444 
445 void ASTStmtWriter::VisitMemberExpr(MemberExpr *E) {
446   // Don't call VisitExpr, we'll write everything here.
447 
448   Record.push_back(E->hasQualifier());
449   if (E->hasQualifier())
450     Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
451 
452   Record.push_back(E->HasTemplateKWAndArgsInfo);
453   if (E->HasTemplateKWAndArgsInfo) {
454     Writer.AddSourceLocation(E->getTemplateKeywordLoc(), Record);
455     unsigned NumTemplateArgs = E->getNumTemplateArgs();
456     Record.push_back(NumTemplateArgs);
457     Writer.AddSourceLocation(E->getLAngleLoc(), Record);
458     Writer.AddSourceLocation(E->getRAngleLoc(), Record);
459     for (unsigned i=0; i != NumTemplateArgs; ++i)
460       Writer.AddTemplateArgumentLoc(E->getTemplateArgs()[i], Record);
461   }
462 
463   Record.push_back(E->hadMultipleCandidates());
464 
465   DeclAccessPair FoundDecl = E->getFoundDecl();
466   Writer.AddDeclRef(FoundDecl.getDecl(), Record);
467   Record.push_back(FoundDecl.getAccess());
468 
469   Writer.AddTypeRef(E->getType(), Record);
470   Record.push_back(E->getValueKind());
471   Record.push_back(E->getObjectKind());
472   Writer.AddStmt(E->getBase());
473   Writer.AddDeclRef(E->getMemberDecl(), Record);
474   Writer.AddSourceLocation(E->getMemberLoc(), Record);
475   Record.push_back(E->isArrow());
476   Writer.AddDeclarationNameLoc(E->MemberDNLoc,
477                                E->getMemberDecl()->getDeclName(), Record);
478   Code = serialization::EXPR_MEMBER;
479 }
480 
481 void ASTStmtWriter::VisitObjCIsaExpr(ObjCIsaExpr *E) {
482   VisitExpr(E);
483   Writer.AddStmt(E->getBase());
484   Writer.AddSourceLocation(E->getIsaMemberLoc(), Record);
485   Record.push_back(E->isArrow());
486   Code = serialization::EXPR_OBJC_ISA;
487 }
488 
489 void ASTStmtWriter::
490 VisitObjCIndirectCopyRestoreExpr(ObjCIndirectCopyRestoreExpr *E) {
491   VisitExpr(E);
492   Writer.AddStmt(E->getSubExpr());
493   Record.push_back(E->shouldCopy());
494   Code = serialization::EXPR_OBJC_INDIRECT_COPY_RESTORE;
495 }
496 
497 void ASTStmtWriter::VisitObjCBridgedCastExpr(ObjCBridgedCastExpr *E) {
498   VisitExplicitCastExpr(E);
499   Writer.AddSourceLocation(E->getLParenLoc(), Record);
500   Writer.AddSourceLocation(E->getBridgeKeywordLoc(), Record);
501   Record.push_back(E->getBridgeKind()); // FIXME: Stable encoding
502   Code = serialization::EXPR_OBJC_BRIDGED_CAST;
503 }
504 
505 void ASTStmtWriter::VisitCastExpr(CastExpr *E) {
506   VisitExpr(E);
507   Record.push_back(E->path_size());
508   Writer.AddStmt(E->getSubExpr());
509   Record.push_back(E->getCastKind()); // FIXME: stable encoding
510 
511   for (CastExpr::path_iterator
512          PI = E->path_begin(), PE = E->path_end(); PI != PE; ++PI)
513     Writer.AddCXXBaseSpecifier(**PI, Record);
514 }
515 
516 void ASTStmtWriter::VisitBinaryOperator(BinaryOperator *E) {
517   VisitExpr(E);
518   Writer.AddStmt(E->getLHS());
519   Writer.AddStmt(E->getRHS());
520   Record.push_back(E->getOpcode()); // FIXME: stable encoding
521   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
522   Code = serialization::EXPR_BINARY_OPERATOR;
523 }
524 
525 void ASTStmtWriter::VisitCompoundAssignOperator(CompoundAssignOperator *E) {
526   VisitBinaryOperator(E);
527   Writer.AddTypeRef(E->getComputationLHSType(), Record);
528   Writer.AddTypeRef(E->getComputationResultType(), Record);
529   Code = serialization::EXPR_COMPOUND_ASSIGN_OPERATOR;
530 }
531 
532 void ASTStmtWriter::VisitConditionalOperator(ConditionalOperator *E) {
533   VisitExpr(E);
534   Writer.AddStmt(E->getCond());
535   Writer.AddStmt(E->getLHS());
536   Writer.AddStmt(E->getRHS());
537   Writer.AddSourceLocation(E->getQuestionLoc(), Record);
538   Writer.AddSourceLocation(E->getColonLoc(), Record);
539   Code = serialization::EXPR_CONDITIONAL_OPERATOR;
540 }
541 
542 void
543 ASTStmtWriter::VisitBinaryConditionalOperator(BinaryConditionalOperator *E) {
544   VisitExpr(E);
545   Writer.AddStmt(E->getOpaqueValue());
546   Writer.AddStmt(E->getCommon());
547   Writer.AddStmt(E->getCond());
548   Writer.AddStmt(E->getTrueExpr());
549   Writer.AddStmt(E->getFalseExpr());
550   Writer.AddSourceLocation(E->getQuestionLoc(), Record);
551   Writer.AddSourceLocation(E->getColonLoc(), Record);
552   Code = serialization::EXPR_BINARY_CONDITIONAL_OPERATOR;
553 }
554 
555 void ASTStmtWriter::VisitImplicitCastExpr(ImplicitCastExpr *E) {
556   VisitCastExpr(E);
557   Code = serialization::EXPR_IMPLICIT_CAST;
558 }
559 
560 void ASTStmtWriter::VisitExplicitCastExpr(ExplicitCastExpr *E) {
561   VisitCastExpr(E);
562   Writer.AddTypeSourceInfo(E->getTypeInfoAsWritten(), Record);
563 }
564 
565 void ASTStmtWriter::VisitCStyleCastExpr(CStyleCastExpr *E) {
566   VisitExplicitCastExpr(E);
567   Writer.AddSourceLocation(E->getLParenLoc(), Record);
568   Writer.AddSourceLocation(E->getRParenLoc(), Record);
569   Code = serialization::EXPR_CSTYLE_CAST;
570 }
571 
572 void ASTStmtWriter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
573   VisitExpr(E);
574   Writer.AddSourceLocation(E->getLParenLoc(), Record);
575   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
576   Writer.AddStmt(E->getInitializer());
577   Record.push_back(E->isFileScope());
578   Code = serialization::EXPR_COMPOUND_LITERAL;
579 }
580 
581 void ASTStmtWriter::VisitExtVectorElementExpr(ExtVectorElementExpr *E) {
582   VisitExpr(E);
583   Writer.AddStmt(E->getBase());
584   Writer.AddIdentifierRef(&E->getAccessor(), Record);
585   Writer.AddSourceLocation(E->getAccessorLoc(), Record);
586   Code = serialization::EXPR_EXT_VECTOR_ELEMENT;
587 }
588 
589 void ASTStmtWriter::VisitInitListExpr(InitListExpr *E) {
590   VisitExpr(E);
591   Writer.AddStmt(E->getSyntacticForm());
592   Writer.AddSourceLocation(E->getLBraceLoc(), Record);
593   Writer.AddSourceLocation(E->getRBraceLoc(), Record);
594   bool isArrayFiller = E->ArrayFillerOrUnionFieldInit.is<Expr*>();
595   Record.push_back(isArrayFiller);
596   if (isArrayFiller)
597     Writer.AddStmt(E->getArrayFiller());
598   else
599     Writer.AddDeclRef(E->getInitializedFieldInUnion(), Record);
600   Record.push_back(E->hadArrayRangeDesignator());
601   Record.push_back(E->getNumInits());
602   if (isArrayFiller) {
603     // ArrayFiller may have filled "holes" due to designated initializer.
604     // Replace them by 0 to indicate that the filler goes in that place.
605     Expr *filler = E->getArrayFiller();
606     for (unsigned I = 0, N = E->getNumInits(); I != N; ++I)
607       Writer.AddStmt(E->getInit(I) != filler ? E->getInit(I) : 0);
608   } else {
609     for (unsigned I = 0, N = E->getNumInits(); I != N; ++I)
610       Writer.AddStmt(E->getInit(I));
611   }
612   Code = serialization::EXPR_INIT_LIST;
613 }
614 
615 void ASTStmtWriter::VisitDesignatedInitExpr(DesignatedInitExpr *E) {
616   VisitExpr(E);
617   Record.push_back(E->getNumSubExprs());
618   for (unsigned I = 0, N = E->getNumSubExprs(); I != N; ++I)
619     Writer.AddStmt(E->getSubExpr(I));
620   Writer.AddSourceLocation(E->getEqualOrColonLoc(), Record);
621   Record.push_back(E->usesGNUSyntax());
622   for (DesignatedInitExpr::designators_iterator D = E->designators_begin(),
623                                              DEnd = E->designators_end();
624        D != DEnd; ++D) {
625     if (D->isFieldDesignator()) {
626       if (FieldDecl *Field = D->getField()) {
627         Record.push_back(serialization::DESIG_FIELD_DECL);
628         Writer.AddDeclRef(Field, Record);
629       } else {
630         Record.push_back(serialization::DESIG_FIELD_NAME);
631         Writer.AddIdentifierRef(D->getFieldName(), Record);
632       }
633       Writer.AddSourceLocation(D->getDotLoc(), Record);
634       Writer.AddSourceLocation(D->getFieldLoc(), Record);
635     } else if (D->isArrayDesignator()) {
636       Record.push_back(serialization::DESIG_ARRAY);
637       Record.push_back(D->getFirstExprIndex());
638       Writer.AddSourceLocation(D->getLBracketLoc(), Record);
639       Writer.AddSourceLocation(D->getRBracketLoc(), Record);
640     } else {
641       assert(D->isArrayRangeDesignator() && "Unknown designator");
642       Record.push_back(serialization::DESIG_ARRAY_RANGE);
643       Record.push_back(D->getFirstExprIndex());
644       Writer.AddSourceLocation(D->getLBracketLoc(), Record);
645       Writer.AddSourceLocation(D->getEllipsisLoc(), Record);
646       Writer.AddSourceLocation(D->getRBracketLoc(), Record);
647     }
648   }
649   Code = serialization::EXPR_DESIGNATED_INIT;
650 }
651 
652 void ASTStmtWriter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
653   VisitExpr(E);
654   Code = serialization::EXPR_IMPLICIT_VALUE_INIT;
655 }
656 
657 void ASTStmtWriter::VisitVAArgExpr(VAArgExpr *E) {
658   VisitExpr(E);
659   Writer.AddStmt(E->getSubExpr());
660   Writer.AddTypeSourceInfo(E->getWrittenTypeInfo(), Record);
661   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
662   Writer.AddSourceLocation(E->getRParenLoc(), Record);
663   Code = serialization::EXPR_VA_ARG;
664 }
665 
666 void ASTStmtWriter::VisitAddrLabelExpr(AddrLabelExpr *E) {
667   VisitExpr(E);
668   Writer.AddSourceLocation(E->getAmpAmpLoc(), Record);
669   Writer.AddSourceLocation(E->getLabelLoc(), Record);
670   Writer.AddDeclRef(E->getLabel(), Record);
671   Code = serialization::EXPR_ADDR_LABEL;
672 }
673 
674 void ASTStmtWriter::VisitStmtExpr(StmtExpr *E) {
675   VisitExpr(E);
676   Writer.AddStmt(E->getSubStmt());
677   Writer.AddSourceLocation(E->getLParenLoc(), Record);
678   Writer.AddSourceLocation(E->getRParenLoc(), Record);
679   Code = serialization::EXPR_STMT;
680 }
681 
682 void ASTStmtWriter::VisitChooseExpr(ChooseExpr *E) {
683   VisitExpr(E);
684   Writer.AddStmt(E->getCond());
685   Writer.AddStmt(E->getLHS());
686   Writer.AddStmt(E->getRHS());
687   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
688   Writer.AddSourceLocation(E->getRParenLoc(), Record);
689   Code = serialization::EXPR_CHOOSE;
690 }
691 
692 void ASTStmtWriter::VisitGNUNullExpr(GNUNullExpr *E) {
693   VisitExpr(E);
694   Writer.AddSourceLocation(E->getTokenLocation(), Record);
695   Code = serialization::EXPR_GNU_NULL;
696 }
697 
698 void ASTStmtWriter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
699   VisitExpr(E);
700   Record.push_back(E->getNumSubExprs());
701   for (unsigned I = 0, N = E->getNumSubExprs(); I != N; ++I)
702     Writer.AddStmt(E->getExpr(I));
703   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
704   Writer.AddSourceLocation(E->getRParenLoc(), Record);
705   Code = serialization::EXPR_SHUFFLE_VECTOR;
706 }
707 
708 void ASTStmtWriter::VisitBlockExpr(BlockExpr *E) {
709   VisitExpr(E);
710   Writer.AddDeclRef(E->getBlockDecl(), Record);
711   Code = serialization::EXPR_BLOCK;
712 }
713 
714 void ASTStmtWriter::VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
715   VisitExpr(E);
716   Writer.AddDeclRef(E->getDecl(), Record);
717   Writer.AddSourceLocation(E->getLocation(), Record);
718   Record.push_back(E->isByRef());
719   Record.push_back(E->isConstQualAdded());
720   Code = serialization::EXPR_BLOCK_DECL_REF;
721 }
722 
723 void ASTStmtWriter::VisitGenericSelectionExpr(GenericSelectionExpr *E) {
724   VisitExpr(E);
725   Record.push_back(E->getNumAssocs());
726 
727   Writer.AddStmt(E->getControllingExpr());
728   for (unsigned I = 0, N = E->getNumAssocs(); I != N; ++I) {
729     Writer.AddTypeSourceInfo(E->getAssocTypeSourceInfo(I), Record);
730     Writer.AddStmt(E->getAssocExpr(I));
731   }
732   Record.push_back(E->isResultDependent() ? -1U : E->getResultIndex());
733 
734   Writer.AddSourceLocation(E->getGenericLoc(), Record);
735   Writer.AddSourceLocation(E->getDefaultLoc(), Record);
736   Writer.AddSourceLocation(E->getRParenLoc(), Record);
737   Code = serialization::EXPR_GENERIC_SELECTION;
738 }
739 
740 void ASTStmtWriter::VisitPseudoObjectExpr(PseudoObjectExpr *E) {
741   VisitExpr(E);
742   Record.push_back(E->getNumSemanticExprs());
743 
744   // Push the result index.  Currently, this needs to exactly match
745   // the encoding used internally for ResultIndex.
746   unsigned result = E->getResultExprIndex();
747   result = (result == PseudoObjectExpr::NoResult ? 0 : result + 1);
748   Record.push_back(result);
749 
750   Writer.AddStmt(E->getSyntacticForm());
751   for (PseudoObjectExpr::semantics_iterator
752          i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
753     Writer.AddStmt(*i);
754   }
755 
756   Code = serialization::EXPR_PSEUDO_OBJECT;
757 }
758 
759 void ASTStmtWriter::VisitAtomicExpr(AtomicExpr *E) {
760   VisitExpr(E);
761   Record.push_back(E->getOp());
762   Writer.AddStmt(E->getPtr());
763   Writer.AddStmt(E->getOrder());
764   if (E->getOp() != AtomicExpr::Load)
765     Writer.AddStmt(E->getVal1());
766   if (E->isCmpXChg()) {
767     Writer.AddStmt(E->getOrderFail());
768     Writer.AddStmt(E->getVal2());
769   }
770   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
771   Writer.AddSourceLocation(E->getRParenLoc(), Record);
772 
773   Code = serialization::EXPR_ATOMIC;
774 }
775 
776 //===----------------------------------------------------------------------===//
777 // Objective-C Expressions and Statements.
778 //===----------------------------------------------------------------------===//
779 
780 void ASTStmtWriter::VisitObjCStringLiteral(ObjCStringLiteral *E) {
781   VisitExpr(E);
782   Writer.AddStmt(E->getString());
783   Writer.AddSourceLocation(E->getAtLoc(), Record);
784   Code = serialization::EXPR_OBJC_STRING_LITERAL;
785 }
786 
787 void ASTStmtWriter::VisitObjCEncodeExpr(ObjCEncodeExpr *E) {
788   VisitExpr(E);
789   Writer.AddTypeSourceInfo(E->getEncodedTypeSourceInfo(), Record);
790   Writer.AddSourceLocation(E->getAtLoc(), Record);
791   Writer.AddSourceLocation(E->getRParenLoc(), Record);
792   Code = serialization::EXPR_OBJC_ENCODE;
793 }
794 
795 void ASTStmtWriter::VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
796   VisitExpr(E);
797   Writer.AddSelectorRef(E->getSelector(), Record);
798   Writer.AddSourceLocation(E->getAtLoc(), Record);
799   Writer.AddSourceLocation(E->getRParenLoc(), Record);
800   Code = serialization::EXPR_OBJC_SELECTOR_EXPR;
801 }
802 
803 void ASTStmtWriter::VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
804   VisitExpr(E);
805   Writer.AddDeclRef(E->getProtocol(), Record);
806   Writer.AddSourceLocation(E->getAtLoc(), Record);
807   Writer.AddSourceLocation(E->getRParenLoc(), Record);
808   Code = serialization::EXPR_OBJC_PROTOCOL_EXPR;
809 }
810 
811 void ASTStmtWriter::VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
812   VisitExpr(E);
813   Writer.AddDeclRef(E->getDecl(), Record);
814   Writer.AddSourceLocation(E->getLocation(), Record);
815   Writer.AddStmt(E->getBase());
816   Record.push_back(E->isArrow());
817   Record.push_back(E->isFreeIvar());
818   Code = serialization::EXPR_OBJC_IVAR_REF_EXPR;
819 }
820 
821 void ASTStmtWriter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
822   VisitExpr(E);
823   Record.push_back(E->isImplicitProperty());
824   if (E->isImplicitProperty()) {
825     Writer.AddDeclRef(E->getImplicitPropertyGetter(), Record);
826     Writer.AddDeclRef(E->getImplicitPropertySetter(), Record);
827   } else {
828     Writer.AddDeclRef(E->getExplicitProperty(), Record);
829   }
830   Writer.AddSourceLocation(E->getLocation(), Record);
831   Writer.AddSourceLocation(E->getReceiverLocation(), Record);
832   if (E->isObjectReceiver()) {
833     Record.push_back(0);
834     Writer.AddStmt(E->getBase());
835   } else if (E->isSuperReceiver()) {
836     Record.push_back(1);
837     Writer.AddTypeRef(E->getSuperReceiverType(), Record);
838   } else {
839     Record.push_back(2);
840     Writer.AddDeclRef(E->getClassReceiver(), Record);
841   }
842 
843   Code = serialization::EXPR_OBJC_PROPERTY_REF_EXPR;
844 }
845 
846 void ASTStmtWriter::VisitObjCMessageExpr(ObjCMessageExpr *E) {
847   VisitExpr(E);
848   Record.push_back(E->getNumArgs());
849   Record.push_back(E->getNumStoredSelLocs());
850   Record.push_back(E->SelLocsKind);
851   Record.push_back(E->isDelegateInitCall());
852   Record.push_back(E->IsImplicit);
853   Record.push_back((unsigned)E->getReceiverKind()); // FIXME: stable encoding
854   switch (E->getReceiverKind()) {
855   case ObjCMessageExpr::Instance:
856     Writer.AddStmt(E->getInstanceReceiver());
857     break;
858 
859   case ObjCMessageExpr::Class:
860     Writer.AddTypeSourceInfo(E->getClassReceiverTypeInfo(), Record);
861     break;
862 
863   case ObjCMessageExpr::SuperClass:
864   case ObjCMessageExpr::SuperInstance:
865     Writer.AddTypeRef(E->getSuperType(), Record);
866     Writer.AddSourceLocation(E->getSuperLoc(), Record);
867     break;
868   }
869 
870   if (E->getMethodDecl()) {
871     Record.push_back(1);
872     Writer.AddDeclRef(E->getMethodDecl(), Record);
873   } else {
874     Record.push_back(0);
875     Writer.AddSelectorRef(E->getSelector(), Record);
876   }
877 
878   Writer.AddSourceLocation(E->getLeftLoc(), Record);
879   Writer.AddSourceLocation(E->getRightLoc(), Record);
880 
881   for (CallExpr::arg_iterator Arg = E->arg_begin(), ArgEnd = E->arg_end();
882        Arg != ArgEnd; ++Arg)
883     Writer.AddStmt(*Arg);
884 
885   SourceLocation *Locs = E->getStoredSelLocs();
886   for (unsigned i = 0, e = E->getNumStoredSelLocs(); i != e; ++i)
887     Writer.AddSourceLocation(Locs[i], Record);
888 
889   Code = serialization::EXPR_OBJC_MESSAGE_EXPR;
890 }
891 
892 void ASTStmtWriter::VisitObjCForCollectionStmt(ObjCForCollectionStmt *S) {
893   VisitStmt(S);
894   Writer.AddStmt(S->getElement());
895   Writer.AddStmt(S->getCollection());
896   Writer.AddStmt(S->getBody());
897   Writer.AddSourceLocation(S->getForLoc(), Record);
898   Writer.AddSourceLocation(S->getRParenLoc(), Record);
899   Code = serialization::STMT_OBJC_FOR_COLLECTION;
900 }
901 
902 void ASTStmtWriter::VisitObjCAtCatchStmt(ObjCAtCatchStmt *S) {
903   Writer.AddStmt(S->getCatchBody());
904   Writer.AddDeclRef(S->getCatchParamDecl(), Record);
905   Writer.AddSourceLocation(S->getAtCatchLoc(), Record);
906   Writer.AddSourceLocation(S->getRParenLoc(), Record);
907   Code = serialization::STMT_OBJC_CATCH;
908 }
909 
910 void ASTStmtWriter::VisitObjCAtFinallyStmt(ObjCAtFinallyStmt *S) {
911   Writer.AddStmt(S->getFinallyBody());
912   Writer.AddSourceLocation(S->getAtFinallyLoc(), Record);
913   Code = serialization::STMT_OBJC_FINALLY;
914 }
915 
916 void ASTStmtWriter::VisitObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S) {
917   Writer.AddStmt(S->getSubStmt());
918   Writer.AddSourceLocation(S->getAtLoc(), Record);
919   Code = serialization::STMT_OBJC_AUTORELEASE_POOL;
920 }
921 
922 void ASTStmtWriter::VisitObjCAtTryStmt(ObjCAtTryStmt *S) {
923   Record.push_back(S->getNumCatchStmts());
924   Record.push_back(S->getFinallyStmt() != 0);
925   Writer.AddStmt(S->getTryBody());
926   for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I)
927     Writer.AddStmt(S->getCatchStmt(I));
928   if (S->getFinallyStmt())
929     Writer.AddStmt(S->getFinallyStmt());
930   Writer.AddSourceLocation(S->getAtTryLoc(), Record);
931   Code = serialization::STMT_OBJC_AT_TRY;
932 }
933 
934 void ASTStmtWriter::VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
935   Writer.AddStmt(S->getSynchExpr());
936   Writer.AddStmt(S->getSynchBody());
937   Writer.AddSourceLocation(S->getAtSynchronizedLoc(), Record);
938   Code = serialization::STMT_OBJC_AT_SYNCHRONIZED;
939 }
940 
941 void ASTStmtWriter::VisitObjCAtThrowStmt(ObjCAtThrowStmt *S) {
942   Writer.AddStmt(S->getThrowExpr());
943   Writer.AddSourceLocation(S->getThrowLoc(), Record);
944   Code = serialization::STMT_OBJC_AT_THROW;
945 }
946 
947 //===----------------------------------------------------------------------===//
948 // C++ Expressions and Statements.
949 //===----------------------------------------------------------------------===//
950 
951 void ASTStmtWriter::VisitCXXCatchStmt(CXXCatchStmt *S) {
952   VisitStmt(S);
953   Writer.AddSourceLocation(S->getCatchLoc(), Record);
954   Writer.AddDeclRef(S->getExceptionDecl(), Record);
955   Writer.AddStmt(S->getHandlerBlock());
956   Code = serialization::STMT_CXX_CATCH;
957 }
958 
959 void ASTStmtWriter::VisitCXXTryStmt(CXXTryStmt *S) {
960   VisitStmt(S);
961   Record.push_back(S->getNumHandlers());
962   Writer.AddSourceLocation(S->getTryLoc(), Record);
963   Writer.AddStmt(S->getTryBlock());
964   for (unsigned i = 0, e = S->getNumHandlers(); i != e; ++i)
965     Writer.AddStmt(S->getHandler(i));
966   Code = serialization::STMT_CXX_TRY;
967 }
968 
969 void ASTStmtWriter::VisitCXXForRangeStmt(CXXForRangeStmt *S) {
970   VisitStmt(S);
971   Writer.AddSourceLocation(S->getForLoc(), Record);
972   Writer.AddSourceLocation(S->getColonLoc(), Record);
973   Writer.AddSourceLocation(S->getRParenLoc(), Record);
974   Writer.AddStmt(S->getRangeStmt());
975   Writer.AddStmt(S->getBeginEndStmt());
976   Writer.AddStmt(S->getCond());
977   Writer.AddStmt(S->getInc());
978   Writer.AddStmt(S->getLoopVarStmt());
979   Writer.AddStmt(S->getBody());
980   Code = serialization::STMT_CXX_FOR_RANGE;
981 }
982 
983 void ASTStmtWriter::VisitMSDependentExistsStmt(MSDependentExistsStmt *S) {
984   VisitStmt(S);
985   Writer.AddSourceLocation(S->getKeywordLoc(), Record);
986   Record.push_back(S->isIfExists());
987   Writer.AddNestedNameSpecifierLoc(S->getQualifierLoc(), Record);
988   Writer.AddDeclarationNameInfo(S->getNameInfo(), Record);
989   Writer.AddStmt(S->getSubStmt());
990   Code = serialization::STMT_MS_DEPENDENT_EXISTS;
991 }
992 
993 void ASTStmtWriter::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
994   VisitCallExpr(E);
995   Record.push_back(E->getOperator());
996   Code = serialization::EXPR_CXX_OPERATOR_CALL;
997 }
998 
999 void ASTStmtWriter::VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
1000   VisitCallExpr(E);
1001   Code = serialization::EXPR_CXX_MEMBER_CALL;
1002 }
1003 
1004 void ASTStmtWriter::VisitCXXConstructExpr(CXXConstructExpr *E) {
1005   VisitExpr(E);
1006   Record.push_back(E->getNumArgs());
1007   for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
1008     Writer.AddStmt(E->getArg(I));
1009   Writer.AddDeclRef(E->getConstructor(), Record);
1010   Writer.AddSourceLocation(E->getLocation(), Record);
1011   Record.push_back(E->isElidable());
1012   Record.push_back(E->hadMultipleCandidates());
1013   Record.push_back(E->requiresZeroInitialization());
1014   Record.push_back(E->getConstructionKind()); // FIXME: stable encoding
1015   Writer.AddSourceRange(E->getParenRange(), Record);
1016   Code = serialization::EXPR_CXX_CONSTRUCT;
1017 }
1018 
1019 void ASTStmtWriter::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *E) {
1020   VisitCXXConstructExpr(E);
1021   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
1022   Code = serialization::EXPR_CXX_TEMPORARY_OBJECT;
1023 }
1024 
1025 void ASTStmtWriter::VisitLambdaExpr(LambdaExpr *E) {
1026   VisitExpr(E);
1027   assert(false && "Cannot serialize lambda expressions yet");
1028 }
1029 
1030 void ASTStmtWriter::VisitCXXNamedCastExpr(CXXNamedCastExpr *E) {
1031   VisitExplicitCastExpr(E);
1032   Writer.AddSourceRange(SourceRange(E->getOperatorLoc(), E->getRParenLoc()),
1033                         Record);
1034 }
1035 
1036 void ASTStmtWriter::VisitCXXStaticCastExpr(CXXStaticCastExpr *E) {
1037   VisitCXXNamedCastExpr(E);
1038   Code = serialization::EXPR_CXX_STATIC_CAST;
1039 }
1040 
1041 void ASTStmtWriter::VisitCXXDynamicCastExpr(CXXDynamicCastExpr *E) {
1042   VisitCXXNamedCastExpr(E);
1043   Code = serialization::EXPR_CXX_DYNAMIC_CAST;
1044 }
1045 
1046 void ASTStmtWriter::VisitCXXReinterpretCastExpr(CXXReinterpretCastExpr *E) {
1047   VisitCXXNamedCastExpr(E);
1048   Code = serialization::EXPR_CXX_REINTERPRET_CAST;
1049 }
1050 
1051 void ASTStmtWriter::VisitCXXConstCastExpr(CXXConstCastExpr *E) {
1052   VisitCXXNamedCastExpr(E);
1053   Code = serialization::EXPR_CXX_CONST_CAST;
1054 }
1055 
1056 void ASTStmtWriter::VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr *E) {
1057   VisitExplicitCastExpr(E);
1058   Writer.AddSourceLocation(E->getTypeBeginLoc(), Record);
1059   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1060   Code = serialization::EXPR_CXX_FUNCTIONAL_CAST;
1061 }
1062 
1063 void ASTStmtWriter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *E) {
1064   VisitExpr(E);
1065   Record.push_back(E->getValue());
1066   Writer.AddSourceLocation(E->getLocation(), Record);
1067   Code = serialization::EXPR_CXX_BOOL_LITERAL;
1068 }
1069 
1070 void ASTStmtWriter::VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *E) {
1071   VisitExpr(E);
1072   Writer.AddSourceLocation(E->getLocation(), Record);
1073   Code = serialization::EXPR_CXX_NULL_PTR_LITERAL;
1074 }
1075 
1076 void ASTStmtWriter::VisitCXXTypeidExpr(CXXTypeidExpr *E) {
1077   VisitExpr(E);
1078   Writer.AddSourceRange(E->getSourceRange(), Record);
1079   if (E->isTypeOperand()) {
1080     Writer.AddTypeSourceInfo(E->getTypeOperandSourceInfo(), Record);
1081     Code = serialization::EXPR_CXX_TYPEID_TYPE;
1082   } else {
1083     Writer.AddStmt(E->getExprOperand());
1084     Code = serialization::EXPR_CXX_TYPEID_EXPR;
1085   }
1086 }
1087 
1088 void ASTStmtWriter::VisitCXXThisExpr(CXXThisExpr *E) {
1089   VisitExpr(E);
1090   Writer.AddSourceLocation(E->getLocation(), Record);
1091   Record.push_back(E->isImplicit());
1092   Code = serialization::EXPR_CXX_THIS;
1093 }
1094 
1095 void ASTStmtWriter::VisitCXXThrowExpr(CXXThrowExpr *E) {
1096   VisitExpr(E);
1097   Writer.AddSourceLocation(E->getThrowLoc(), Record);
1098   Writer.AddStmt(E->getSubExpr());
1099   Record.push_back(E->isThrownVariableInScope());
1100   Code = serialization::EXPR_CXX_THROW;
1101 }
1102 
1103 void ASTStmtWriter::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
1104   VisitExpr(E);
1105 
1106   bool HasOtherExprStored = E->Param.getInt();
1107   // Store these first, the reader reads them before creation.
1108   Record.push_back(HasOtherExprStored);
1109   if (HasOtherExprStored)
1110     Writer.AddStmt(E->getExpr());
1111   Writer.AddDeclRef(E->getParam(), Record);
1112   Writer.AddSourceLocation(E->getUsedLocation(), Record);
1113 
1114   Code = serialization::EXPR_CXX_DEFAULT_ARG;
1115 }
1116 
1117 void ASTStmtWriter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
1118   VisitExpr(E);
1119   Writer.AddCXXTemporary(E->getTemporary(), Record);
1120   Writer.AddStmt(E->getSubExpr());
1121   Code = serialization::EXPR_CXX_BIND_TEMPORARY;
1122 }
1123 
1124 void ASTStmtWriter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
1125   VisitExpr(E);
1126   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
1127   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1128   Code = serialization::EXPR_CXX_SCALAR_VALUE_INIT;
1129 }
1130 
1131 void ASTStmtWriter::VisitCXXNewExpr(CXXNewExpr *E) {
1132   VisitExpr(E);
1133   Record.push_back(E->isGlobalNew());
1134   Record.push_back(E->hasInitializer());
1135   Record.push_back(E->doesUsualArrayDeleteWantSize());
1136   Record.push_back(E->isArray());
1137   Record.push_back(E->hadMultipleCandidates());
1138   Record.push_back(E->getNumPlacementArgs());
1139   Record.push_back(E->getNumConstructorArgs());
1140   Writer.AddDeclRef(E->getOperatorNew(), Record);
1141   Writer.AddDeclRef(E->getOperatorDelete(), Record);
1142   Writer.AddDeclRef(E->getConstructor(), Record);
1143   Writer.AddTypeSourceInfo(E->getAllocatedTypeSourceInfo(), Record);
1144   Writer.AddSourceRange(E->getTypeIdParens(), Record);
1145   Writer.AddSourceLocation(E->getStartLoc(), Record);
1146   Writer.AddSourceLocation(E->getEndLoc(), Record);
1147   Writer.AddSourceLocation(E->getConstructorLParen(), Record);
1148   Writer.AddSourceLocation(E->getConstructorRParen(), Record);
1149   for (CXXNewExpr::arg_iterator I = E->raw_arg_begin(), e = E->raw_arg_end();
1150        I != e; ++I)
1151     Writer.AddStmt(*I);
1152 
1153   Code = serialization::EXPR_CXX_NEW;
1154 }
1155 
1156 void ASTStmtWriter::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1157   VisitExpr(E);
1158   Record.push_back(E->isGlobalDelete());
1159   Record.push_back(E->isArrayForm());
1160   Record.push_back(E->isArrayFormAsWritten());
1161   Record.push_back(E->doesUsualArrayDeleteWantSize());
1162   Writer.AddDeclRef(E->getOperatorDelete(), Record);
1163   Writer.AddStmt(E->getArgument());
1164   Writer.AddSourceLocation(E->getSourceRange().getBegin(), Record);
1165 
1166   Code = serialization::EXPR_CXX_DELETE;
1167 }
1168 
1169 void ASTStmtWriter::VisitCXXPseudoDestructorExpr(CXXPseudoDestructorExpr *E) {
1170   VisitExpr(E);
1171 
1172   Writer.AddStmt(E->getBase());
1173   Record.push_back(E->isArrow());
1174   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
1175   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1176   Writer.AddTypeSourceInfo(E->getScopeTypeInfo(), Record);
1177   Writer.AddSourceLocation(E->getColonColonLoc(), Record);
1178   Writer.AddSourceLocation(E->getTildeLoc(), Record);
1179 
1180   // PseudoDestructorTypeStorage.
1181   Writer.AddIdentifierRef(E->getDestroyedTypeIdentifier(), Record);
1182   if (E->getDestroyedTypeIdentifier())
1183     Writer.AddSourceLocation(E->getDestroyedTypeLoc(), Record);
1184   else
1185     Writer.AddTypeSourceInfo(E->getDestroyedTypeInfo(), Record);
1186 
1187   Code = serialization::EXPR_CXX_PSEUDO_DESTRUCTOR;
1188 }
1189 
1190 void ASTStmtWriter::VisitExprWithCleanups(ExprWithCleanups *E) {
1191   VisitExpr(E);
1192   Record.push_back(E->getNumObjects());
1193   for (unsigned i = 0, e = E->getNumObjects(); i != e; ++i)
1194     Writer.AddDeclRef(E->getObject(i), Record);
1195 
1196   Writer.AddStmt(E->getSubExpr());
1197   Code = serialization::EXPR_EXPR_WITH_CLEANUPS;
1198 }
1199 
1200 void
1201 ASTStmtWriter::VisitCXXDependentScopeMemberExpr(CXXDependentScopeMemberExpr *E){
1202   VisitExpr(E);
1203 
1204   // Don't emit anything here, HasTemplateKWAndArgsInfo must be
1205   // emitted first.
1206 
1207   Record.push_back(E->HasTemplateKWAndArgsInfo);
1208   if (E->HasTemplateKWAndArgsInfo) {
1209     const ASTTemplateKWAndArgsInfo &Args = *E->getTemplateKWAndArgsInfo();
1210     Record.push_back(Args.NumTemplateArgs);
1211     AddTemplateKWAndArgsInfo(Args);
1212   }
1213 
1214   if (!E->isImplicitAccess())
1215     Writer.AddStmt(E->getBase());
1216   else
1217     Writer.AddStmt(0);
1218   Writer.AddTypeRef(E->getBaseType(), Record);
1219   Record.push_back(E->isArrow());
1220   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
1221   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1222   Writer.AddDeclRef(E->getFirstQualifierFoundInScope(), Record);
1223   Writer.AddDeclarationNameInfo(E->MemberNameInfo, Record);
1224   Code = serialization::EXPR_CXX_DEPENDENT_SCOPE_MEMBER;
1225 }
1226 
1227 void
1228 ASTStmtWriter::VisitDependentScopeDeclRefExpr(DependentScopeDeclRefExpr *E) {
1229   VisitExpr(E);
1230 
1231   // Don't emit anything here, HasTemplateKWAndArgsInfo must be
1232   // emitted first.
1233 
1234   Record.push_back(E->HasTemplateKWAndArgsInfo);
1235   if (E->HasTemplateKWAndArgsInfo) {
1236     const ASTTemplateKWAndArgsInfo &Args = *E->getTemplateKWAndArgsInfo();
1237     Record.push_back(Args.NumTemplateArgs);
1238     AddTemplateKWAndArgsInfo(Args);
1239   }
1240 
1241   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1242   Writer.AddDeclarationNameInfo(E->NameInfo, Record);
1243   Code = serialization::EXPR_CXX_DEPENDENT_SCOPE_DECL_REF;
1244 }
1245 
1246 void
1247 ASTStmtWriter::VisitCXXUnresolvedConstructExpr(CXXUnresolvedConstructExpr *E) {
1248   VisitExpr(E);
1249   Record.push_back(E->arg_size());
1250   for (CXXUnresolvedConstructExpr::arg_iterator
1251          ArgI = E->arg_begin(), ArgE = E->arg_end(); ArgI != ArgE; ++ArgI)
1252     Writer.AddStmt(*ArgI);
1253   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
1254   Writer.AddSourceLocation(E->getLParenLoc(), Record);
1255   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1256   Code = serialization::EXPR_CXX_UNRESOLVED_CONSTRUCT;
1257 }
1258 
1259 void ASTStmtWriter::VisitOverloadExpr(OverloadExpr *E) {
1260   VisitExpr(E);
1261 
1262   // Don't emit anything here, HasTemplateKWAndArgsInfo must be
1263   // emitted first.
1264 
1265   Record.push_back(E->HasTemplateKWAndArgsInfo);
1266   if (E->HasTemplateKWAndArgsInfo) {
1267     const ASTTemplateKWAndArgsInfo &Args = *E->getTemplateKWAndArgsInfo();
1268     Record.push_back(Args.NumTemplateArgs);
1269     AddTemplateKWAndArgsInfo(Args);
1270   }
1271 
1272   Record.push_back(E->getNumDecls());
1273   for (OverloadExpr::decls_iterator
1274          OvI = E->decls_begin(), OvE = E->decls_end(); OvI != OvE; ++OvI) {
1275     Writer.AddDeclRef(OvI.getDecl(), Record);
1276     Record.push_back(OvI.getAccess());
1277   }
1278 
1279   Writer.AddDeclarationNameInfo(E->NameInfo, Record);
1280   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1281 }
1282 
1283 void ASTStmtWriter::VisitUnresolvedMemberExpr(UnresolvedMemberExpr *E) {
1284   VisitOverloadExpr(E);
1285   Record.push_back(E->isArrow());
1286   Record.push_back(E->hasUnresolvedUsing());
1287   Writer.AddStmt(!E->isImplicitAccess() ? E->getBase() : 0);
1288   Writer.AddTypeRef(E->getBaseType(), Record);
1289   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
1290   Code = serialization::EXPR_CXX_UNRESOLVED_MEMBER;
1291 }
1292 
1293 void ASTStmtWriter::VisitUnresolvedLookupExpr(UnresolvedLookupExpr *E) {
1294   VisitOverloadExpr(E);
1295   Record.push_back(E->requiresADL());
1296   if (E->requiresADL())
1297     Record.push_back(E->isStdAssociatedNamespace());
1298   Record.push_back(E->isOverloaded());
1299   Writer.AddDeclRef(E->getNamingClass(), Record);
1300   Code = serialization::EXPR_CXX_UNRESOLVED_LOOKUP;
1301 }
1302 
1303 void ASTStmtWriter::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
1304   VisitExpr(E);
1305   Record.push_back(E->getTrait());
1306   Record.push_back(E->getValue());
1307   Writer.AddSourceRange(E->getSourceRange(), Record);
1308   Writer.AddTypeSourceInfo(E->getQueriedTypeSourceInfo(), Record);
1309   Code = serialization::EXPR_CXX_UNARY_TYPE_TRAIT;
1310 }
1311 
1312 void ASTStmtWriter::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *E) {
1313   VisitExpr(E);
1314   Record.push_back(E->getTrait());
1315   Record.push_back(E->getValue());
1316   Writer.AddSourceRange(E->getSourceRange(), Record);
1317   Writer.AddTypeSourceInfo(E->getLhsTypeSourceInfo(), Record);
1318   Writer.AddTypeSourceInfo(E->getRhsTypeSourceInfo(), Record);
1319   Code = serialization::EXPR_BINARY_TYPE_TRAIT;
1320 }
1321 
1322 void ASTStmtWriter::VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
1323   VisitExpr(E);
1324   Record.push_back(E->getTrait());
1325   Record.push_back(E->getValue());
1326   Writer.AddSourceRange(E->getSourceRange(), Record);
1327   Writer.AddTypeSourceInfo(E->getQueriedTypeSourceInfo(), Record);
1328   Code = serialization::EXPR_ARRAY_TYPE_TRAIT;
1329 }
1330 
1331 void ASTStmtWriter::VisitExpressionTraitExpr(ExpressionTraitExpr *E) {
1332   VisitExpr(E);
1333   Record.push_back(E->getTrait());
1334   Record.push_back(E->getValue());
1335   Writer.AddSourceRange(E->getSourceRange(), Record);
1336   Writer.AddStmt(E->getQueriedExpression());
1337   Code = serialization::EXPR_CXX_EXPRESSION_TRAIT;
1338 }
1339 
1340 void ASTStmtWriter::VisitCXXNoexceptExpr(CXXNoexceptExpr *E) {
1341   VisitExpr(E);
1342   Record.push_back(E->getValue());
1343   Writer.AddSourceRange(E->getSourceRange(), Record);
1344   Writer.AddStmt(E->getOperand());
1345   Code = serialization::EXPR_CXX_NOEXCEPT;
1346 }
1347 
1348 void ASTStmtWriter::VisitPackExpansionExpr(PackExpansionExpr *E) {
1349   VisitExpr(E);
1350   Writer.AddSourceLocation(E->getEllipsisLoc(), Record);
1351   Record.push_back(E->NumExpansions);
1352   Writer.AddStmt(E->getPattern());
1353   Code = serialization::EXPR_PACK_EXPANSION;
1354 }
1355 
1356 void ASTStmtWriter::VisitSizeOfPackExpr(SizeOfPackExpr *E) {
1357   VisitExpr(E);
1358   Writer.AddSourceLocation(E->OperatorLoc, Record);
1359   Writer.AddSourceLocation(E->PackLoc, Record);
1360   Writer.AddSourceLocation(E->RParenLoc, Record);
1361   Record.push_back(E->Length);
1362   Writer.AddDeclRef(E->Pack, Record);
1363   Code = serialization::EXPR_SIZEOF_PACK;
1364 }
1365 
1366 void ASTStmtWriter::VisitSubstNonTypeTemplateParmExpr(
1367                                               SubstNonTypeTemplateParmExpr *E) {
1368   VisitExpr(E);
1369   Writer.AddDeclRef(E->getParameter(), Record);
1370   Writer.AddSourceLocation(E->getNameLoc(), Record);
1371   Writer.AddStmt(E->getReplacement());
1372   Code = serialization::EXPR_SUBST_NON_TYPE_TEMPLATE_PARM;
1373 }
1374 
1375 void ASTStmtWriter::VisitSubstNonTypeTemplateParmPackExpr(
1376                                           SubstNonTypeTemplateParmPackExpr *E) {
1377   VisitExpr(E);
1378   Writer.AddDeclRef(E->getParameterPack(), Record);
1379   Writer.AddTemplateArgument(E->getArgumentPack(), Record);
1380   Writer.AddSourceLocation(E->getParameterPackLocation(), Record);
1381   Code = serialization::EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK;
1382 }
1383 
1384 void ASTStmtWriter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E) {
1385   VisitExpr(E);
1386   Writer.AddStmt(E->Temporary);
1387   Code = serialization::EXPR_MATERIALIZE_TEMPORARY;
1388 }
1389 
1390 void ASTStmtWriter::VisitOpaqueValueExpr(OpaqueValueExpr *E) {
1391   VisitExpr(E);
1392   Writer.AddStmt(E->getSourceExpr());
1393   Writer.AddSourceLocation(E->getLocation(), Record);
1394   Code = serialization::EXPR_OPAQUE_VALUE;
1395 }
1396 
1397 //===----------------------------------------------------------------------===//
1398 // CUDA Expressions and Statements.
1399 //===----------------------------------------------------------------------===//
1400 
1401 void ASTStmtWriter::VisitCUDAKernelCallExpr(CUDAKernelCallExpr *E) {
1402   VisitCallExpr(E);
1403   Writer.AddStmt(E->getConfig());
1404   Code = serialization::EXPR_CUDA_KERNEL_CALL;
1405 }
1406 
1407 //===----------------------------------------------------------------------===//
1408 // OpenCL Expressions and Statements.
1409 //===----------------------------------------------------------------------===//
1410 void ASTStmtWriter::VisitAsTypeExpr(AsTypeExpr *E) {
1411   VisitExpr(E);
1412   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
1413   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1414   Writer.AddStmt(E->getSrcExpr());
1415   Code = serialization::EXPR_ASTYPE;
1416 }
1417 
1418 //===----------------------------------------------------------------------===//
1419 // Microsoft Expressions and Statements.
1420 //===----------------------------------------------------------------------===//
1421 void ASTStmtWriter::VisitCXXUuidofExpr(CXXUuidofExpr *E) {
1422   VisitExpr(E);
1423   Writer.AddSourceRange(E->getSourceRange(), Record);
1424   if (E->isTypeOperand()) {
1425     Writer.AddTypeSourceInfo(E->getTypeOperandSourceInfo(), Record);
1426     Code = serialization::EXPR_CXX_UUIDOF_TYPE;
1427   } else {
1428     Writer.AddStmt(E->getExprOperand());
1429     Code = serialization::EXPR_CXX_UUIDOF_EXPR;
1430   }
1431 }
1432 
1433 void ASTStmtWriter::VisitSEHExceptStmt(SEHExceptStmt *S) {
1434   VisitStmt(S);
1435   Writer.AddSourceLocation(S->getExceptLoc(), Record);
1436   Writer.AddStmt(S->getFilterExpr());
1437   Writer.AddStmt(S->getBlock());
1438   Code = serialization::STMT_SEH_EXCEPT;
1439 }
1440 
1441 void ASTStmtWriter::VisitSEHFinallyStmt(SEHFinallyStmt *S) {
1442   VisitStmt(S);
1443   Writer.AddSourceLocation(S->getFinallyLoc(), Record);
1444   Writer.AddStmt(S->getBlock());
1445   Code = serialization::STMT_SEH_FINALLY;
1446 }
1447 
1448 void ASTStmtWriter::VisitSEHTryStmt(SEHTryStmt *S) {
1449   VisitStmt(S);
1450   Record.push_back(S->getIsCXXTry());
1451   Writer.AddSourceLocation(S->getTryLoc(), Record);
1452   Writer.AddStmt(S->getTryBlock());
1453   Writer.AddStmt(S->getHandler());
1454   Code = serialization::STMT_SEH_TRY;
1455 }
1456 
1457 //===----------------------------------------------------------------------===//
1458 // ASTWriter Implementation
1459 //===----------------------------------------------------------------------===//
1460 
1461 unsigned ASTWriter::RecordSwitchCaseID(SwitchCase *S) {
1462   assert(SwitchCaseIDs.find(S) == SwitchCaseIDs.end() &&
1463          "SwitchCase recorded twice");
1464   unsigned NextID = SwitchCaseIDs.size();
1465   SwitchCaseIDs[S] = NextID;
1466   return NextID;
1467 }
1468 
1469 unsigned ASTWriter::getSwitchCaseID(SwitchCase *S) {
1470   assert(SwitchCaseIDs.find(S) != SwitchCaseIDs.end() &&
1471          "SwitchCase hasn't been seen yet");
1472   return SwitchCaseIDs[S];
1473 }
1474 
1475 void ASTWriter::ClearSwitchCaseIDs() {
1476   SwitchCaseIDs.clear();
1477 }
1478 
1479 /// \brief Write the given substatement or subexpression to the
1480 /// bitstream.
1481 void ASTWriter::WriteSubStmt(Stmt *S,
1482                              llvm::DenseMap<Stmt *, uint64_t> &SubStmtEntries,
1483                              llvm::DenseSet<Stmt *> &ParentStmts) {
1484   RecordData Record;
1485   ASTStmtWriter Writer(*this, Record);
1486   ++NumStatements;
1487 
1488   if (!S) {
1489     Stream.EmitRecord(serialization::STMT_NULL_PTR, Record);
1490     return;
1491   }
1492 
1493   llvm::DenseMap<Stmt *, uint64_t>::iterator I = SubStmtEntries.find(S);
1494   if (I != SubStmtEntries.end()) {
1495     Record.push_back(I->second);
1496     Stream.EmitRecord(serialization::STMT_REF_PTR, Record);
1497     return;
1498   }
1499 
1500 #ifndef NDEBUG
1501   assert(!ParentStmts.count(S) && "There is a Stmt cycle!");
1502 
1503   struct ParentStmtInserterRAII {
1504     Stmt *S;
1505     llvm::DenseSet<Stmt *> &ParentStmts;
1506 
1507     ParentStmtInserterRAII(Stmt *S, llvm::DenseSet<Stmt *> &ParentStmts)
1508       : S(S), ParentStmts(ParentStmts) {
1509       ParentStmts.insert(S);
1510     }
1511     ~ParentStmtInserterRAII() {
1512       ParentStmts.erase(S);
1513     }
1514   };
1515 
1516   ParentStmtInserterRAII ParentStmtInserter(S, ParentStmts);
1517 #endif
1518 
1519   // Redirect ASTWriter::AddStmt to collect sub stmts.
1520   SmallVector<Stmt *, 16> SubStmts;
1521   CollectedStmts = &SubStmts;
1522 
1523   Writer.Code = serialization::STMT_NULL_PTR;
1524   Writer.AbbrevToUse = 0;
1525   Writer.Visit(S);
1526 
1527 #ifndef NDEBUG
1528   if (Writer.Code == serialization::STMT_NULL_PTR) {
1529     SourceManager &SrcMgr
1530       = DeclIDs.begin()->first->getASTContext().getSourceManager();
1531     S->dump(SrcMgr);
1532     llvm_unreachable("Unhandled sub statement writing AST file");
1533   }
1534 #endif
1535 
1536   // Revert ASTWriter::AddStmt.
1537   CollectedStmts = &StmtsToEmit;
1538 
1539   // Write the sub stmts in reverse order, last to first. When reading them back
1540   // we will read them in correct order by "pop"ing them from the Stmts stack.
1541   // This simplifies reading and allows to store a variable number of sub stmts
1542   // without knowing it in advance.
1543   while (!SubStmts.empty())
1544     WriteSubStmt(SubStmts.pop_back_val(), SubStmtEntries, ParentStmts);
1545 
1546   Stream.EmitRecord(Writer.Code, Record, Writer.AbbrevToUse);
1547 
1548   SubStmtEntries[S] = Stream.GetCurrentBitNo();
1549 }
1550 
1551 /// \brief Flush all of the statements that have been added to the
1552 /// queue via AddStmt().
1553 void ASTWriter::FlushStmts() {
1554   RecordData Record;
1555 
1556   /// \brief Set of parent Stmts for the currently serializing sub stmt.
1557   llvm::DenseSet<Stmt *> ParentStmts;
1558   /// \brief Offsets of sub stmts already serialized. The offset points
1559   /// just after the stmt record.
1560   llvm::DenseMap<Stmt *, uint64_t> SubStmtEntries;
1561 
1562   for (unsigned I = 0, N = StmtsToEmit.size(); I != N; ++I) {
1563     WriteSubStmt(StmtsToEmit[I], SubStmtEntries, ParentStmts);
1564 
1565     assert(N == StmtsToEmit.size() &&
1566            "Substatement written via AddStmt rather than WriteSubStmt!");
1567 
1568     // Note that we are at the end of a full expression. Any
1569     // expression records that follow this one are part of a different
1570     // expression.
1571     Stream.EmitRecord(serialization::STMT_STOP, Record);
1572 
1573     SubStmtEntries.clear();
1574     ParentStmts.clear();
1575   }
1576 
1577   StmtsToEmit.clear();
1578 }
1579