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
39     AddExplicitTemplateArgumentList(const ASTTemplateArgumentListInfo &Args);
40 
41     void VisitStmt(Stmt *S);
42 #define STMT(Type, Base) \
43     void Visit##Type(Type *);
44 #include "clang/AST/StmtNodes.inc"
45   };
46 }
47 
48 void ASTStmtWriter::
49 AddExplicitTemplateArgumentList(const ASTTemplateArgumentListInfo &Args) {
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->hasExplicitTemplateArgs());
268   Record.push_back(E->hadMultipleCandidates());
269 
270   if (E->hasExplicitTemplateArgs()) {
271     unsigned NumTemplateArgs = E->getNumTemplateArgs();
272     Record.push_back(NumTemplateArgs);
273   }
274 
275   DeclarationName::NameKind nk = (E->getDecl()->getDeclName().getNameKind());
276 
277   if ((!E->hasExplicitTemplateArgs()) && (!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->hasExplicitTemplateArgs())
290     AddExplicitTemplateArgumentList(E->getExplicitTemplateArgs());
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->hasExplicitTemplateArgs());
453   if (E->hasExplicitTemplateArgs()) {
454     unsigned NumTemplateArgs = E->getNumTemplateArgs();
455     Record.push_back(NumTemplateArgs);
456     Writer.AddSourceLocation(E->getLAngleLoc(), Record);
457     Writer.AddSourceLocation(E->getRAngleLoc(), Record);
458     for (unsigned i=0; i != NumTemplateArgs; ++i)
459       Writer.AddTemplateArgumentLoc(E->getTemplateArgs()[i], Record);
460   }
461 
462   Record.push_back(E->hadMultipleCandidates());
463 
464   DeclAccessPair FoundDecl = E->getFoundDecl();
465   Writer.AddDeclRef(FoundDecl.getDecl(), Record);
466   Record.push_back(FoundDecl.getAccess());
467 
468   Writer.AddTypeRef(E->getType(), Record);
469   Record.push_back(E->getValueKind());
470   Record.push_back(E->getObjectKind());
471   Writer.AddStmt(E->getBase());
472   Writer.AddDeclRef(E->getMemberDecl(), Record);
473   Writer.AddSourceLocation(E->getMemberLoc(), Record);
474   Record.push_back(E->isArrow());
475   Writer.AddDeclarationNameLoc(E->MemberDNLoc,
476                                E->getMemberDecl()->getDeclName(), Record);
477   Code = serialization::EXPR_MEMBER;
478 }
479 
480 void ASTStmtWriter::VisitObjCIsaExpr(ObjCIsaExpr *E) {
481   VisitExpr(E);
482   Writer.AddStmt(E->getBase());
483   Writer.AddSourceLocation(E->getIsaMemberLoc(), Record);
484   Record.push_back(E->isArrow());
485   Code = serialization::EXPR_OBJC_ISA;
486 }
487 
488 void ASTStmtWriter::
489 VisitObjCIndirectCopyRestoreExpr(ObjCIndirectCopyRestoreExpr *E) {
490   VisitExpr(E);
491   Writer.AddStmt(E->getSubExpr());
492   Record.push_back(E->shouldCopy());
493   Code = serialization::EXPR_OBJC_INDIRECT_COPY_RESTORE;
494 }
495 
496 void ASTStmtWriter::VisitObjCBridgedCastExpr(ObjCBridgedCastExpr *E) {
497   VisitExplicitCastExpr(E);
498   Writer.AddSourceLocation(E->getLParenLoc(), Record);
499   Writer.AddSourceLocation(E->getBridgeKeywordLoc(), Record);
500   Record.push_back(E->getBridgeKind()); // FIXME: Stable encoding
501   Code = serialization::EXPR_OBJC_BRIDGED_CAST;
502 }
503 
504 void ASTStmtWriter::VisitCastExpr(CastExpr *E) {
505   VisitExpr(E);
506   Record.push_back(E->path_size());
507   Writer.AddStmt(E->getSubExpr());
508   Record.push_back(E->getCastKind()); // FIXME: stable encoding
509 
510   for (CastExpr::path_iterator
511          PI = E->path_begin(), PE = E->path_end(); PI != PE; ++PI)
512     Writer.AddCXXBaseSpecifier(**PI, Record);
513 }
514 
515 void ASTStmtWriter::VisitBinaryOperator(BinaryOperator *E) {
516   VisitExpr(E);
517   Writer.AddStmt(E->getLHS());
518   Writer.AddStmt(E->getRHS());
519   Record.push_back(E->getOpcode()); // FIXME: stable encoding
520   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
521   Code = serialization::EXPR_BINARY_OPERATOR;
522 }
523 
524 void ASTStmtWriter::VisitCompoundAssignOperator(CompoundAssignOperator *E) {
525   VisitBinaryOperator(E);
526   Writer.AddTypeRef(E->getComputationLHSType(), Record);
527   Writer.AddTypeRef(E->getComputationResultType(), Record);
528   Code = serialization::EXPR_COMPOUND_ASSIGN_OPERATOR;
529 }
530 
531 void ASTStmtWriter::VisitConditionalOperator(ConditionalOperator *E) {
532   VisitExpr(E);
533   Writer.AddStmt(E->getCond());
534   Writer.AddStmt(E->getLHS());
535   Writer.AddStmt(E->getRHS());
536   Writer.AddSourceLocation(E->getQuestionLoc(), Record);
537   Writer.AddSourceLocation(E->getColonLoc(), Record);
538   Code = serialization::EXPR_CONDITIONAL_OPERATOR;
539 }
540 
541 void
542 ASTStmtWriter::VisitBinaryConditionalOperator(BinaryConditionalOperator *E) {
543   VisitExpr(E);
544   Writer.AddStmt(E->getOpaqueValue());
545   Writer.AddStmt(E->getCommon());
546   Writer.AddStmt(E->getCond());
547   Writer.AddStmt(E->getTrueExpr());
548   Writer.AddStmt(E->getFalseExpr());
549   Writer.AddSourceLocation(E->getQuestionLoc(), Record);
550   Writer.AddSourceLocation(E->getColonLoc(), Record);
551   Code = serialization::EXPR_BINARY_CONDITIONAL_OPERATOR;
552 }
553 
554 void ASTStmtWriter::VisitImplicitCastExpr(ImplicitCastExpr *E) {
555   VisitCastExpr(E);
556   Code = serialization::EXPR_IMPLICIT_CAST;
557 }
558 
559 void ASTStmtWriter::VisitExplicitCastExpr(ExplicitCastExpr *E) {
560   VisitCastExpr(E);
561   Writer.AddTypeSourceInfo(E->getTypeInfoAsWritten(), Record);
562 }
563 
564 void ASTStmtWriter::VisitCStyleCastExpr(CStyleCastExpr *E) {
565   VisitExplicitCastExpr(E);
566   Writer.AddSourceLocation(E->getLParenLoc(), Record);
567   Writer.AddSourceLocation(E->getRParenLoc(), Record);
568   Code = serialization::EXPR_CSTYLE_CAST;
569 }
570 
571 void ASTStmtWriter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
572   VisitExpr(E);
573   Writer.AddSourceLocation(E->getLParenLoc(), Record);
574   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
575   Writer.AddStmt(E->getInitializer());
576   Record.push_back(E->isFileScope());
577   Code = serialization::EXPR_COMPOUND_LITERAL;
578 }
579 
580 void ASTStmtWriter::VisitExtVectorElementExpr(ExtVectorElementExpr *E) {
581   VisitExpr(E);
582   Writer.AddStmt(E->getBase());
583   Writer.AddIdentifierRef(&E->getAccessor(), Record);
584   Writer.AddSourceLocation(E->getAccessorLoc(), Record);
585   Code = serialization::EXPR_EXT_VECTOR_ELEMENT;
586 }
587 
588 void ASTStmtWriter::VisitInitListExpr(InitListExpr *E) {
589   VisitExpr(E);
590   Writer.AddStmt(E->getSyntacticForm());
591   Writer.AddSourceLocation(E->getLBraceLoc(), Record);
592   Writer.AddSourceLocation(E->getRBraceLoc(), Record);
593   bool isArrayFiller = E->ArrayFillerOrUnionFieldInit.is<Expr*>();
594   Record.push_back(isArrayFiller);
595   if (isArrayFiller)
596     Writer.AddStmt(E->getArrayFiller());
597   else
598     Writer.AddDeclRef(E->getInitializedFieldInUnion(), Record);
599   Record.push_back(E->hadArrayRangeDesignator());
600   Record.push_back(E->getNumInits());
601   if (isArrayFiller) {
602     // ArrayFiller may have filled "holes" due to designated initializer.
603     // Replace them by 0 to indicate that the filler goes in that place.
604     Expr *filler = E->getArrayFiller();
605     for (unsigned I = 0, N = E->getNumInits(); I != N; ++I)
606       Writer.AddStmt(E->getInit(I) != filler ? E->getInit(I) : 0);
607   } else {
608     for (unsigned I = 0, N = E->getNumInits(); I != N; ++I)
609       Writer.AddStmt(E->getInit(I));
610   }
611   Code = serialization::EXPR_INIT_LIST;
612 }
613 
614 void ASTStmtWriter::VisitDesignatedInitExpr(DesignatedInitExpr *E) {
615   VisitExpr(E);
616   Record.push_back(E->getNumSubExprs());
617   for (unsigned I = 0, N = E->getNumSubExprs(); I != N; ++I)
618     Writer.AddStmt(E->getSubExpr(I));
619   Writer.AddSourceLocation(E->getEqualOrColonLoc(), Record);
620   Record.push_back(E->usesGNUSyntax());
621   for (DesignatedInitExpr::designators_iterator D = E->designators_begin(),
622                                              DEnd = E->designators_end();
623        D != DEnd; ++D) {
624     if (D->isFieldDesignator()) {
625       if (FieldDecl *Field = D->getField()) {
626         Record.push_back(serialization::DESIG_FIELD_DECL);
627         Writer.AddDeclRef(Field, Record);
628       } else {
629         Record.push_back(serialization::DESIG_FIELD_NAME);
630         Writer.AddIdentifierRef(D->getFieldName(), Record);
631       }
632       Writer.AddSourceLocation(D->getDotLoc(), Record);
633       Writer.AddSourceLocation(D->getFieldLoc(), Record);
634     } else if (D->isArrayDesignator()) {
635       Record.push_back(serialization::DESIG_ARRAY);
636       Record.push_back(D->getFirstExprIndex());
637       Writer.AddSourceLocation(D->getLBracketLoc(), Record);
638       Writer.AddSourceLocation(D->getRBracketLoc(), Record);
639     } else {
640       assert(D->isArrayRangeDesignator() && "Unknown designator");
641       Record.push_back(serialization::DESIG_ARRAY_RANGE);
642       Record.push_back(D->getFirstExprIndex());
643       Writer.AddSourceLocation(D->getLBracketLoc(), Record);
644       Writer.AddSourceLocation(D->getEllipsisLoc(), Record);
645       Writer.AddSourceLocation(D->getRBracketLoc(), Record);
646     }
647   }
648   Code = serialization::EXPR_DESIGNATED_INIT;
649 }
650 
651 void ASTStmtWriter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
652   VisitExpr(E);
653   Code = serialization::EXPR_IMPLICIT_VALUE_INIT;
654 }
655 
656 void ASTStmtWriter::VisitVAArgExpr(VAArgExpr *E) {
657   VisitExpr(E);
658   Writer.AddStmt(E->getSubExpr());
659   Writer.AddTypeSourceInfo(E->getWrittenTypeInfo(), Record);
660   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
661   Writer.AddSourceLocation(E->getRParenLoc(), Record);
662   Code = serialization::EXPR_VA_ARG;
663 }
664 
665 void ASTStmtWriter::VisitAddrLabelExpr(AddrLabelExpr *E) {
666   VisitExpr(E);
667   Writer.AddSourceLocation(E->getAmpAmpLoc(), Record);
668   Writer.AddSourceLocation(E->getLabelLoc(), Record);
669   Writer.AddDeclRef(E->getLabel(), Record);
670   Code = serialization::EXPR_ADDR_LABEL;
671 }
672 
673 void ASTStmtWriter::VisitStmtExpr(StmtExpr *E) {
674   VisitExpr(E);
675   Writer.AddStmt(E->getSubStmt());
676   Writer.AddSourceLocation(E->getLParenLoc(), Record);
677   Writer.AddSourceLocation(E->getRParenLoc(), Record);
678   Code = serialization::EXPR_STMT;
679 }
680 
681 void ASTStmtWriter::VisitChooseExpr(ChooseExpr *E) {
682   VisitExpr(E);
683   Writer.AddStmt(E->getCond());
684   Writer.AddStmt(E->getLHS());
685   Writer.AddStmt(E->getRHS());
686   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
687   Writer.AddSourceLocation(E->getRParenLoc(), Record);
688   Code = serialization::EXPR_CHOOSE;
689 }
690 
691 void ASTStmtWriter::VisitGNUNullExpr(GNUNullExpr *E) {
692   VisitExpr(E);
693   Writer.AddSourceLocation(E->getTokenLocation(), Record);
694   Code = serialization::EXPR_GNU_NULL;
695 }
696 
697 void ASTStmtWriter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
698   VisitExpr(E);
699   Record.push_back(E->getNumSubExprs());
700   for (unsigned I = 0, N = E->getNumSubExprs(); I != N; ++I)
701     Writer.AddStmt(E->getExpr(I));
702   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
703   Writer.AddSourceLocation(E->getRParenLoc(), Record);
704   Code = serialization::EXPR_SHUFFLE_VECTOR;
705 }
706 
707 void ASTStmtWriter::VisitBlockExpr(BlockExpr *E) {
708   VisitExpr(E);
709   Writer.AddDeclRef(E->getBlockDecl(), Record);
710   Code = serialization::EXPR_BLOCK;
711 }
712 
713 void ASTStmtWriter::VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
714   VisitExpr(E);
715   Writer.AddDeclRef(E->getDecl(), Record);
716   Writer.AddSourceLocation(E->getLocation(), Record);
717   Record.push_back(E->isByRef());
718   Record.push_back(E->isConstQualAdded());
719   Code = serialization::EXPR_BLOCK_DECL_REF;
720 }
721 
722 void ASTStmtWriter::VisitGenericSelectionExpr(GenericSelectionExpr *E) {
723   VisitExpr(E);
724   Record.push_back(E->getNumAssocs());
725 
726   Writer.AddStmt(E->getControllingExpr());
727   for (unsigned I = 0, N = E->getNumAssocs(); I != N; ++I) {
728     Writer.AddTypeSourceInfo(E->getAssocTypeSourceInfo(I), Record);
729     Writer.AddStmt(E->getAssocExpr(I));
730   }
731   Record.push_back(E->isResultDependent() ? -1U : E->getResultIndex());
732 
733   Writer.AddSourceLocation(E->getGenericLoc(), Record);
734   Writer.AddSourceLocation(E->getDefaultLoc(), Record);
735   Writer.AddSourceLocation(E->getRParenLoc(), Record);
736   Code = serialization::EXPR_GENERIC_SELECTION;
737 }
738 
739 void ASTStmtWriter::VisitPseudoObjectExpr(PseudoObjectExpr *E) {
740   VisitExpr(E);
741   Record.push_back(E->getNumSemanticExprs());
742 
743   // Push the result index.  Currently, this needs to exactly match
744   // the encoding used internally for ResultIndex.
745   unsigned result = E->getResultExprIndex();
746   result = (result == PseudoObjectExpr::NoResult ? 0 : result + 1);
747   Record.push_back(result);
748 
749   Writer.AddStmt(E->getSyntacticForm());
750   for (PseudoObjectExpr::semantics_iterator
751          i = E->semantics_begin(), e = E->semantics_end(); i != e; ++i) {
752     Writer.AddStmt(*i);
753   }
754 
755   Code = serialization::EXPR_PSEUDO_OBJECT;
756 }
757 
758 void ASTStmtWriter::VisitAtomicExpr(AtomicExpr *E) {
759   VisitExpr(E);
760   Record.push_back(E->getOp());
761   Writer.AddStmt(E->getPtr());
762   Writer.AddStmt(E->getOrder());
763   if (E->getOp() != AtomicExpr::Load)
764     Writer.AddStmt(E->getVal1());
765   if (E->isCmpXChg()) {
766     Writer.AddStmt(E->getOrderFail());
767     Writer.AddStmt(E->getVal2());
768   }
769   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
770   Writer.AddSourceLocation(E->getRParenLoc(), Record);
771 
772   Code = serialization::EXPR_ATOMIC;
773 }
774 
775 //===----------------------------------------------------------------------===//
776 // Objective-C Expressions and Statements.
777 //===----------------------------------------------------------------------===//
778 
779 void ASTStmtWriter::VisitObjCStringLiteral(ObjCStringLiteral *E) {
780   VisitExpr(E);
781   Writer.AddStmt(E->getString());
782   Writer.AddSourceLocation(E->getAtLoc(), Record);
783   Code = serialization::EXPR_OBJC_STRING_LITERAL;
784 }
785 
786 void ASTStmtWriter::VisitObjCEncodeExpr(ObjCEncodeExpr *E) {
787   VisitExpr(E);
788   Writer.AddTypeSourceInfo(E->getEncodedTypeSourceInfo(), Record);
789   Writer.AddSourceLocation(E->getAtLoc(), Record);
790   Writer.AddSourceLocation(E->getRParenLoc(), Record);
791   Code = serialization::EXPR_OBJC_ENCODE;
792 }
793 
794 void ASTStmtWriter::VisitObjCSelectorExpr(ObjCSelectorExpr *E) {
795   VisitExpr(E);
796   Writer.AddSelectorRef(E->getSelector(), Record);
797   Writer.AddSourceLocation(E->getAtLoc(), Record);
798   Writer.AddSourceLocation(E->getRParenLoc(), Record);
799   Code = serialization::EXPR_OBJC_SELECTOR_EXPR;
800 }
801 
802 void ASTStmtWriter::VisitObjCProtocolExpr(ObjCProtocolExpr *E) {
803   VisitExpr(E);
804   Writer.AddDeclRef(E->getProtocol(), Record);
805   Writer.AddSourceLocation(E->getAtLoc(), Record);
806   Writer.AddSourceLocation(E->getRParenLoc(), Record);
807   Code = serialization::EXPR_OBJC_PROTOCOL_EXPR;
808 }
809 
810 void ASTStmtWriter::VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
811   VisitExpr(E);
812   Writer.AddDeclRef(E->getDecl(), Record);
813   Writer.AddSourceLocation(E->getLocation(), Record);
814   Writer.AddStmt(E->getBase());
815   Record.push_back(E->isArrow());
816   Record.push_back(E->isFreeIvar());
817   Code = serialization::EXPR_OBJC_IVAR_REF_EXPR;
818 }
819 
820 void ASTStmtWriter::VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *E) {
821   VisitExpr(E);
822   Record.push_back(E->isImplicitProperty());
823   if (E->isImplicitProperty()) {
824     Writer.AddDeclRef(E->getImplicitPropertyGetter(), Record);
825     Writer.AddDeclRef(E->getImplicitPropertySetter(), Record);
826   } else {
827     Writer.AddDeclRef(E->getExplicitProperty(), Record);
828   }
829   Writer.AddSourceLocation(E->getLocation(), Record);
830   Writer.AddSourceLocation(E->getReceiverLocation(), Record);
831   if (E->isObjectReceiver()) {
832     Record.push_back(0);
833     Writer.AddStmt(E->getBase());
834   } else if (E->isSuperReceiver()) {
835     Record.push_back(1);
836     Writer.AddTypeRef(E->getSuperReceiverType(), Record);
837   } else {
838     Record.push_back(2);
839     Writer.AddDeclRef(E->getClassReceiver(), Record);
840   }
841 
842   Code = serialization::EXPR_OBJC_PROPERTY_REF_EXPR;
843 }
844 
845 void ASTStmtWriter::VisitObjCMessageExpr(ObjCMessageExpr *E) {
846   VisitExpr(E);
847   Record.push_back(E->getNumArgs());
848   Record.push_back(E->getNumStoredSelLocs());
849   Record.push_back(E->SelLocsKind);
850   Record.push_back(E->isDelegateInitCall());
851   Record.push_back(E->IsImplicit);
852   Record.push_back((unsigned)E->getReceiverKind()); // FIXME: stable encoding
853   switch (E->getReceiverKind()) {
854   case ObjCMessageExpr::Instance:
855     Writer.AddStmt(E->getInstanceReceiver());
856     break;
857 
858   case ObjCMessageExpr::Class:
859     Writer.AddTypeSourceInfo(E->getClassReceiverTypeInfo(), Record);
860     break;
861 
862   case ObjCMessageExpr::SuperClass:
863   case ObjCMessageExpr::SuperInstance:
864     Writer.AddTypeRef(E->getSuperType(), Record);
865     Writer.AddSourceLocation(E->getSuperLoc(), Record);
866     break;
867   }
868 
869   if (E->getMethodDecl()) {
870     Record.push_back(1);
871     Writer.AddDeclRef(E->getMethodDecl(), Record);
872   } else {
873     Record.push_back(0);
874     Writer.AddSelectorRef(E->getSelector(), Record);
875   }
876 
877   Writer.AddSourceLocation(E->getLeftLoc(), Record);
878   Writer.AddSourceLocation(E->getRightLoc(), Record);
879 
880   for (CallExpr::arg_iterator Arg = E->arg_begin(), ArgEnd = E->arg_end();
881        Arg != ArgEnd; ++Arg)
882     Writer.AddStmt(*Arg);
883 
884   SourceLocation *Locs = E->getStoredSelLocs();
885   for (unsigned i = 0, e = E->getNumStoredSelLocs(); i != e; ++i)
886     Writer.AddSourceLocation(Locs[i], Record);
887 
888   Code = serialization::EXPR_OBJC_MESSAGE_EXPR;
889 }
890 
891 void ASTStmtWriter::VisitObjCForCollectionStmt(ObjCForCollectionStmt *S) {
892   VisitStmt(S);
893   Writer.AddStmt(S->getElement());
894   Writer.AddStmt(S->getCollection());
895   Writer.AddStmt(S->getBody());
896   Writer.AddSourceLocation(S->getForLoc(), Record);
897   Writer.AddSourceLocation(S->getRParenLoc(), Record);
898   Code = serialization::STMT_OBJC_FOR_COLLECTION;
899 }
900 
901 void ASTStmtWriter::VisitObjCAtCatchStmt(ObjCAtCatchStmt *S) {
902   Writer.AddStmt(S->getCatchBody());
903   Writer.AddDeclRef(S->getCatchParamDecl(), Record);
904   Writer.AddSourceLocation(S->getAtCatchLoc(), Record);
905   Writer.AddSourceLocation(S->getRParenLoc(), Record);
906   Code = serialization::STMT_OBJC_CATCH;
907 }
908 
909 void ASTStmtWriter::VisitObjCAtFinallyStmt(ObjCAtFinallyStmt *S) {
910   Writer.AddStmt(S->getFinallyBody());
911   Writer.AddSourceLocation(S->getAtFinallyLoc(), Record);
912   Code = serialization::STMT_OBJC_FINALLY;
913 }
914 
915 void ASTStmtWriter::VisitObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S) {
916   Writer.AddStmt(S->getSubStmt());
917   Writer.AddSourceLocation(S->getAtLoc(), Record);
918   Code = serialization::STMT_OBJC_AUTORELEASE_POOL;
919 }
920 
921 void ASTStmtWriter::VisitObjCAtTryStmt(ObjCAtTryStmt *S) {
922   Record.push_back(S->getNumCatchStmts());
923   Record.push_back(S->getFinallyStmt() != 0);
924   Writer.AddStmt(S->getTryBody());
925   for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I)
926     Writer.AddStmt(S->getCatchStmt(I));
927   if (S->getFinallyStmt())
928     Writer.AddStmt(S->getFinallyStmt());
929   Writer.AddSourceLocation(S->getAtTryLoc(), Record);
930   Code = serialization::STMT_OBJC_AT_TRY;
931 }
932 
933 void ASTStmtWriter::VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
934   Writer.AddStmt(S->getSynchExpr());
935   Writer.AddStmt(S->getSynchBody());
936   Writer.AddSourceLocation(S->getAtSynchronizedLoc(), Record);
937   Code = serialization::STMT_OBJC_AT_SYNCHRONIZED;
938 }
939 
940 void ASTStmtWriter::VisitObjCAtThrowStmt(ObjCAtThrowStmt *S) {
941   Writer.AddStmt(S->getThrowExpr());
942   Writer.AddSourceLocation(S->getThrowLoc(), Record);
943   Code = serialization::STMT_OBJC_AT_THROW;
944 }
945 
946 //===----------------------------------------------------------------------===//
947 // C++ Expressions and Statements.
948 //===----------------------------------------------------------------------===//
949 
950 void ASTStmtWriter::VisitCXXCatchStmt(CXXCatchStmt *S) {
951   VisitStmt(S);
952   Writer.AddSourceLocation(S->getCatchLoc(), Record);
953   Writer.AddDeclRef(S->getExceptionDecl(), Record);
954   Writer.AddStmt(S->getHandlerBlock());
955   Code = serialization::STMT_CXX_CATCH;
956 }
957 
958 void ASTStmtWriter::VisitCXXTryStmt(CXXTryStmt *S) {
959   VisitStmt(S);
960   Record.push_back(S->getNumHandlers());
961   Writer.AddSourceLocation(S->getTryLoc(), Record);
962   Writer.AddStmt(S->getTryBlock());
963   for (unsigned i = 0, e = S->getNumHandlers(); i != e; ++i)
964     Writer.AddStmt(S->getHandler(i));
965   Code = serialization::STMT_CXX_TRY;
966 }
967 
968 void ASTStmtWriter::VisitCXXForRangeStmt(CXXForRangeStmt *S) {
969   VisitStmt(S);
970   Writer.AddSourceLocation(S->getForLoc(), Record);
971   Writer.AddSourceLocation(S->getColonLoc(), Record);
972   Writer.AddSourceLocation(S->getRParenLoc(), Record);
973   Writer.AddStmt(S->getRangeStmt());
974   Writer.AddStmt(S->getBeginEndStmt());
975   Writer.AddStmt(S->getCond());
976   Writer.AddStmt(S->getInc());
977   Writer.AddStmt(S->getLoopVarStmt());
978   Writer.AddStmt(S->getBody());
979   Code = serialization::STMT_CXX_FOR_RANGE;
980 }
981 
982 void ASTStmtWriter::VisitMSDependentExistsStmt(MSDependentExistsStmt *S) {
983   VisitStmt(S);
984   Writer.AddSourceLocation(S->getKeywordLoc(), Record);
985   Record.push_back(S->isIfExists());
986   Writer.AddNestedNameSpecifierLoc(S->getQualifierLoc(), Record);
987   Writer.AddDeclarationNameInfo(S->getNameInfo(), Record);
988   Writer.AddStmt(S->getSubStmt());
989   Code = serialization::STMT_MS_DEPENDENT_EXISTS;
990 }
991 
992 void ASTStmtWriter::VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
993   VisitCallExpr(E);
994   Record.push_back(E->getOperator());
995   Code = serialization::EXPR_CXX_OPERATOR_CALL;
996 }
997 
998 void ASTStmtWriter::VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
999   VisitCallExpr(E);
1000   Code = serialization::EXPR_CXX_MEMBER_CALL;
1001 }
1002 
1003 void ASTStmtWriter::VisitCXXConstructExpr(CXXConstructExpr *E) {
1004   VisitExpr(E);
1005   Record.push_back(E->getNumArgs());
1006   for (unsigned I = 0, N = E->getNumArgs(); I != N; ++I)
1007     Writer.AddStmt(E->getArg(I));
1008   Writer.AddDeclRef(E->getConstructor(), Record);
1009   Writer.AddSourceLocation(E->getLocation(), Record);
1010   Record.push_back(E->isElidable());
1011   Record.push_back(E->hadMultipleCandidates());
1012   Record.push_back(E->requiresZeroInitialization());
1013   Record.push_back(E->getConstructionKind()); // FIXME: stable encoding
1014   Writer.AddSourceRange(E->getParenRange(), Record);
1015   Code = serialization::EXPR_CXX_CONSTRUCT;
1016 }
1017 
1018 void ASTStmtWriter::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *E) {
1019   VisitCXXConstructExpr(E);
1020   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
1021   Code = serialization::EXPR_CXX_TEMPORARY_OBJECT;
1022 }
1023 
1024 void ASTStmtWriter::VisitCXXNamedCastExpr(CXXNamedCastExpr *E) {
1025   VisitExplicitCastExpr(E);
1026   Writer.AddSourceRange(SourceRange(E->getOperatorLoc(), E->getRParenLoc()),
1027                         Record);
1028 }
1029 
1030 void ASTStmtWriter::VisitCXXStaticCastExpr(CXXStaticCastExpr *E) {
1031   VisitCXXNamedCastExpr(E);
1032   Code = serialization::EXPR_CXX_STATIC_CAST;
1033 }
1034 
1035 void ASTStmtWriter::VisitCXXDynamicCastExpr(CXXDynamicCastExpr *E) {
1036   VisitCXXNamedCastExpr(E);
1037   Code = serialization::EXPR_CXX_DYNAMIC_CAST;
1038 }
1039 
1040 void ASTStmtWriter::VisitCXXReinterpretCastExpr(CXXReinterpretCastExpr *E) {
1041   VisitCXXNamedCastExpr(E);
1042   Code = serialization::EXPR_CXX_REINTERPRET_CAST;
1043 }
1044 
1045 void ASTStmtWriter::VisitCXXConstCastExpr(CXXConstCastExpr *E) {
1046   VisitCXXNamedCastExpr(E);
1047   Code = serialization::EXPR_CXX_CONST_CAST;
1048 }
1049 
1050 void ASTStmtWriter::VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr *E) {
1051   VisitExplicitCastExpr(E);
1052   Writer.AddSourceLocation(E->getTypeBeginLoc(), Record);
1053   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1054   Code = serialization::EXPR_CXX_FUNCTIONAL_CAST;
1055 }
1056 
1057 void ASTStmtWriter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *E) {
1058   VisitExpr(E);
1059   Record.push_back(E->getValue());
1060   Writer.AddSourceLocation(E->getLocation(), Record);
1061   Code = serialization::EXPR_CXX_BOOL_LITERAL;
1062 }
1063 
1064 void ASTStmtWriter::VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *E) {
1065   VisitExpr(E);
1066   Writer.AddSourceLocation(E->getLocation(), Record);
1067   Code = serialization::EXPR_CXX_NULL_PTR_LITERAL;
1068 }
1069 
1070 void ASTStmtWriter::VisitCXXTypeidExpr(CXXTypeidExpr *E) {
1071   VisitExpr(E);
1072   Writer.AddSourceRange(E->getSourceRange(), Record);
1073   if (E->isTypeOperand()) {
1074     Writer.AddTypeSourceInfo(E->getTypeOperandSourceInfo(), Record);
1075     Code = serialization::EXPR_CXX_TYPEID_TYPE;
1076   } else {
1077     Writer.AddStmt(E->getExprOperand());
1078     Code = serialization::EXPR_CXX_TYPEID_EXPR;
1079   }
1080 }
1081 
1082 void ASTStmtWriter::VisitCXXThisExpr(CXXThisExpr *E) {
1083   VisitExpr(E);
1084   Writer.AddSourceLocation(E->getLocation(), Record);
1085   Record.push_back(E->isImplicit());
1086   Code = serialization::EXPR_CXX_THIS;
1087 }
1088 
1089 void ASTStmtWriter::VisitCXXThrowExpr(CXXThrowExpr *E) {
1090   VisitExpr(E);
1091   Writer.AddSourceLocation(E->getThrowLoc(), Record);
1092   Writer.AddStmt(E->getSubExpr());
1093   Record.push_back(E->isThrownVariableInScope());
1094   Code = serialization::EXPR_CXX_THROW;
1095 }
1096 
1097 void ASTStmtWriter::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
1098   VisitExpr(E);
1099 
1100   bool HasOtherExprStored = E->Param.getInt();
1101   // Store these first, the reader reads them before creation.
1102   Record.push_back(HasOtherExprStored);
1103   if (HasOtherExprStored)
1104     Writer.AddStmt(E->getExpr());
1105   Writer.AddDeclRef(E->getParam(), Record);
1106   Writer.AddSourceLocation(E->getUsedLocation(), Record);
1107 
1108   Code = serialization::EXPR_CXX_DEFAULT_ARG;
1109 }
1110 
1111 void ASTStmtWriter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
1112   VisitExpr(E);
1113   Writer.AddCXXTemporary(E->getTemporary(), Record);
1114   Writer.AddStmt(E->getSubExpr());
1115   Code = serialization::EXPR_CXX_BIND_TEMPORARY;
1116 }
1117 
1118 void ASTStmtWriter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
1119   VisitExpr(E);
1120   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
1121   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1122   Code = serialization::EXPR_CXX_SCALAR_VALUE_INIT;
1123 }
1124 
1125 void ASTStmtWriter::VisitCXXNewExpr(CXXNewExpr *E) {
1126   VisitExpr(E);
1127   Record.push_back(E->isGlobalNew());
1128   Record.push_back(E->hasInitializer());
1129   Record.push_back(E->doesUsualArrayDeleteWantSize());
1130   Record.push_back(E->isArray());
1131   Record.push_back(E->hadMultipleCandidates());
1132   Record.push_back(E->getNumPlacementArgs());
1133   Record.push_back(E->getNumConstructorArgs());
1134   Writer.AddDeclRef(E->getOperatorNew(), Record);
1135   Writer.AddDeclRef(E->getOperatorDelete(), Record);
1136   Writer.AddDeclRef(E->getConstructor(), Record);
1137   Writer.AddTypeSourceInfo(E->getAllocatedTypeSourceInfo(), Record);
1138   Writer.AddSourceRange(E->getTypeIdParens(), Record);
1139   Writer.AddSourceLocation(E->getStartLoc(), Record);
1140   Writer.AddSourceLocation(E->getEndLoc(), Record);
1141   Writer.AddSourceLocation(E->getConstructorLParen(), Record);
1142   Writer.AddSourceLocation(E->getConstructorRParen(), Record);
1143   for (CXXNewExpr::arg_iterator I = E->raw_arg_begin(), e = E->raw_arg_end();
1144        I != e; ++I)
1145     Writer.AddStmt(*I);
1146 
1147   Code = serialization::EXPR_CXX_NEW;
1148 }
1149 
1150 void ASTStmtWriter::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
1151   VisitExpr(E);
1152   Record.push_back(E->isGlobalDelete());
1153   Record.push_back(E->isArrayForm());
1154   Record.push_back(E->isArrayFormAsWritten());
1155   Record.push_back(E->doesUsualArrayDeleteWantSize());
1156   Writer.AddDeclRef(E->getOperatorDelete(), Record);
1157   Writer.AddStmt(E->getArgument());
1158   Writer.AddSourceLocation(E->getSourceRange().getBegin(), Record);
1159 
1160   Code = serialization::EXPR_CXX_DELETE;
1161 }
1162 
1163 void ASTStmtWriter::VisitCXXPseudoDestructorExpr(CXXPseudoDestructorExpr *E) {
1164   VisitExpr(E);
1165 
1166   Writer.AddStmt(E->getBase());
1167   Record.push_back(E->isArrow());
1168   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
1169   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1170   Writer.AddTypeSourceInfo(E->getScopeTypeInfo(), Record);
1171   Writer.AddSourceLocation(E->getColonColonLoc(), Record);
1172   Writer.AddSourceLocation(E->getTildeLoc(), Record);
1173 
1174   // PseudoDestructorTypeStorage.
1175   Writer.AddIdentifierRef(E->getDestroyedTypeIdentifier(), Record);
1176   if (E->getDestroyedTypeIdentifier())
1177     Writer.AddSourceLocation(E->getDestroyedTypeLoc(), Record);
1178   else
1179     Writer.AddTypeSourceInfo(E->getDestroyedTypeInfo(), Record);
1180 
1181   Code = serialization::EXPR_CXX_PSEUDO_DESTRUCTOR;
1182 }
1183 
1184 void ASTStmtWriter::VisitExprWithCleanups(ExprWithCleanups *E) {
1185   VisitExpr(E);
1186   Record.push_back(E->getNumObjects());
1187   for (unsigned i = 0, e = E->getNumObjects(); i != e; ++i)
1188     Writer.AddDeclRef(E->getObject(i), Record);
1189 
1190   Writer.AddStmt(E->getSubExpr());
1191   Code = serialization::EXPR_EXPR_WITH_CLEANUPS;
1192 }
1193 
1194 void
1195 ASTStmtWriter::VisitCXXDependentScopeMemberExpr(CXXDependentScopeMemberExpr *E){
1196   VisitExpr(E);
1197 
1198   // Don't emit anything here, hasExplicitTemplateArgs() must be
1199   // emitted first.
1200 
1201   Record.push_back(E->hasExplicitTemplateArgs());
1202   if (E->hasExplicitTemplateArgs()) {
1203     const ASTTemplateArgumentListInfo &Args = E->getExplicitTemplateArgs();
1204     Record.push_back(Args.NumTemplateArgs);
1205     AddExplicitTemplateArgumentList(Args);
1206   }
1207 
1208   if (!E->isImplicitAccess())
1209     Writer.AddStmt(E->getBase());
1210   else
1211     Writer.AddStmt(0);
1212   Writer.AddTypeRef(E->getBaseType(), Record);
1213   Record.push_back(E->isArrow());
1214   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
1215   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1216   Writer.AddDeclRef(E->getFirstQualifierFoundInScope(), Record);
1217   Writer.AddDeclarationNameInfo(E->MemberNameInfo, Record);
1218   Code = serialization::EXPR_CXX_DEPENDENT_SCOPE_MEMBER;
1219 }
1220 
1221 void
1222 ASTStmtWriter::VisitDependentScopeDeclRefExpr(DependentScopeDeclRefExpr *E) {
1223   VisitExpr(E);
1224 
1225   // Don't emit anything here, hasExplicitTemplateArgs() must be
1226   // emitted first.
1227   Record.push_back(E->hasExplicitTemplateArgs());
1228   if (E->hasExplicitTemplateArgs()) {
1229     const ASTTemplateArgumentListInfo &Args = E->getExplicitTemplateArgs();
1230     Record.push_back(Args.NumTemplateArgs);
1231     AddExplicitTemplateArgumentList(Args);
1232   }
1233 
1234   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1235   Writer.AddDeclarationNameInfo(E->NameInfo, Record);
1236   Code = serialization::EXPR_CXX_DEPENDENT_SCOPE_DECL_REF;
1237 }
1238 
1239 void
1240 ASTStmtWriter::VisitCXXUnresolvedConstructExpr(CXXUnresolvedConstructExpr *E) {
1241   VisitExpr(E);
1242   Record.push_back(E->arg_size());
1243   for (CXXUnresolvedConstructExpr::arg_iterator
1244          ArgI = E->arg_begin(), ArgE = E->arg_end(); ArgI != ArgE; ++ArgI)
1245     Writer.AddStmt(*ArgI);
1246   Writer.AddTypeSourceInfo(E->getTypeSourceInfo(), Record);
1247   Writer.AddSourceLocation(E->getLParenLoc(), Record);
1248   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1249   Code = serialization::EXPR_CXX_UNRESOLVED_CONSTRUCT;
1250 }
1251 
1252 void ASTStmtWriter::VisitOverloadExpr(OverloadExpr *E) {
1253   VisitExpr(E);
1254 
1255   // Don't emit anything here, hasExplicitTemplateArgs() must be emitted first.
1256   Record.push_back(E->hasExplicitTemplateArgs());
1257   if (E->hasExplicitTemplateArgs()) {
1258     const ASTTemplateArgumentListInfo &Args = E->getExplicitTemplateArgs();
1259     Record.push_back(Args.NumTemplateArgs);
1260     AddExplicitTemplateArgumentList(Args);
1261   }
1262 
1263   Record.push_back(E->getNumDecls());
1264   for (OverloadExpr::decls_iterator
1265          OvI = E->decls_begin(), OvE = E->decls_end(); OvI != OvE; ++OvI) {
1266     Writer.AddDeclRef(OvI.getDecl(), Record);
1267     Record.push_back(OvI.getAccess());
1268   }
1269 
1270   Writer.AddDeclarationNameInfo(E->NameInfo, Record);
1271   Writer.AddNestedNameSpecifierLoc(E->getQualifierLoc(), Record);
1272 }
1273 
1274 void ASTStmtWriter::VisitUnresolvedMemberExpr(UnresolvedMemberExpr *E) {
1275   VisitOverloadExpr(E);
1276   Record.push_back(E->isArrow());
1277   Record.push_back(E->hasUnresolvedUsing());
1278   Writer.AddStmt(!E->isImplicitAccess() ? E->getBase() : 0);
1279   Writer.AddTypeRef(E->getBaseType(), Record);
1280   Writer.AddSourceLocation(E->getOperatorLoc(), Record);
1281   Code = serialization::EXPR_CXX_UNRESOLVED_MEMBER;
1282 }
1283 
1284 void ASTStmtWriter::VisitUnresolvedLookupExpr(UnresolvedLookupExpr *E) {
1285   VisitOverloadExpr(E);
1286   Record.push_back(E->requiresADL());
1287   if (E->requiresADL())
1288     Record.push_back(E->isStdAssociatedNamespace());
1289   Record.push_back(E->isOverloaded());
1290   Writer.AddDeclRef(E->getNamingClass(), Record);
1291   Code = serialization::EXPR_CXX_UNRESOLVED_LOOKUP;
1292 }
1293 
1294 void ASTStmtWriter::VisitUnaryTypeTraitExpr(UnaryTypeTraitExpr *E) {
1295   VisitExpr(E);
1296   Record.push_back(E->getTrait());
1297   Record.push_back(E->getValue());
1298   Writer.AddSourceRange(E->getSourceRange(), Record);
1299   Writer.AddTypeSourceInfo(E->getQueriedTypeSourceInfo(), Record);
1300   Code = serialization::EXPR_CXX_UNARY_TYPE_TRAIT;
1301 }
1302 
1303 void ASTStmtWriter::VisitBinaryTypeTraitExpr(BinaryTypeTraitExpr *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->getLhsTypeSourceInfo(), Record);
1309   Writer.AddTypeSourceInfo(E->getRhsTypeSourceInfo(), Record);
1310   Code = serialization::EXPR_BINARY_TYPE_TRAIT;
1311 }
1312 
1313 void ASTStmtWriter::VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
1314   VisitExpr(E);
1315   Record.push_back(E->getTrait());
1316   Record.push_back(E->getValue());
1317   Writer.AddSourceRange(E->getSourceRange(), Record);
1318   Writer.AddTypeSourceInfo(E->getQueriedTypeSourceInfo(), Record);
1319   Code = serialization::EXPR_ARRAY_TYPE_TRAIT;
1320 }
1321 
1322 void ASTStmtWriter::VisitExpressionTraitExpr(ExpressionTraitExpr *E) {
1323   VisitExpr(E);
1324   Record.push_back(E->getTrait());
1325   Record.push_back(E->getValue());
1326   Writer.AddSourceRange(E->getSourceRange(), Record);
1327   Writer.AddStmt(E->getQueriedExpression());
1328   Code = serialization::EXPR_CXX_EXPRESSION_TRAIT;
1329 }
1330 
1331 void ASTStmtWriter::VisitCXXNoexceptExpr(CXXNoexceptExpr *E) {
1332   VisitExpr(E);
1333   Record.push_back(E->getValue());
1334   Writer.AddSourceRange(E->getSourceRange(), Record);
1335   Writer.AddStmt(E->getOperand());
1336   Code = serialization::EXPR_CXX_NOEXCEPT;
1337 }
1338 
1339 void ASTStmtWriter::VisitPackExpansionExpr(PackExpansionExpr *E) {
1340   VisitExpr(E);
1341   Writer.AddSourceLocation(E->getEllipsisLoc(), Record);
1342   Record.push_back(E->NumExpansions);
1343   Writer.AddStmt(E->getPattern());
1344   Code = serialization::EXPR_PACK_EXPANSION;
1345 }
1346 
1347 void ASTStmtWriter::VisitSizeOfPackExpr(SizeOfPackExpr *E) {
1348   VisitExpr(E);
1349   Writer.AddSourceLocation(E->OperatorLoc, Record);
1350   Writer.AddSourceLocation(E->PackLoc, Record);
1351   Writer.AddSourceLocation(E->RParenLoc, Record);
1352   Record.push_back(E->Length);
1353   Writer.AddDeclRef(E->Pack, Record);
1354   Code = serialization::EXPR_SIZEOF_PACK;
1355 }
1356 
1357 void ASTStmtWriter::VisitSubstNonTypeTemplateParmExpr(
1358                                               SubstNonTypeTemplateParmExpr *E) {
1359   VisitExpr(E);
1360   Writer.AddDeclRef(E->getParameter(), Record);
1361   Writer.AddSourceLocation(E->getNameLoc(), Record);
1362   Writer.AddStmt(E->getReplacement());
1363   Code = serialization::EXPR_SUBST_NON_TYPE_TEMPLATE_PARM;
1364 }
1365 
1366 void ASTStmtWriter::VisitSubstNonTypeTemplateParmPackExpr(
1367                                           SubstNonTypeTemplateParmPackExpr *E) {
1368   VisitExpr(E);
1369   Writer.AddDeclRef(E->getParameterPack(), Record);
1370   Writer.AddTemplateArgument(E->getArgumentPack(), Record);
1371   Writer.AddSourceLocation(E->getParameterPackLocation(), Record);
1372   Code = serialization::EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK;
1373 }
1374 
1375 void ASTStmtWriter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E) {
1376   VisitExpr(E);
1377   Writer.AddStmt(E->Temporary);
1378   Code = serialization::EXPR_MATERIALIZE_TEMPORARY;
1379 }
1380 
1381 void ASTStmtWriter::VisitOpaqueValueExpr(OpaqueValueExpr *E) {
1382   VisitExpr(E);
1383   Writer.AddStmt(E->getSourceExpr());
1384   Writer.AddSourceLocation(E->getLocation(), Record);
1385   Code = serialization::EXPR_OPAQUE_VALUE;
1386 }
1387 
1388 //===----------------------------------------------------------------------===//
1389 // CUDA Expressions and Statements.
1390 //===----------------------------------------------------------------------===//
1391 
1392 void ASTStmtWriter::VisitCUDAKernelCallExpr(CUDAKernelCallExpr *E) {
1393   VisitCallExpr(E);
1394   Writer.AddStmt(E->getConfig());
1395   Code = serialization::EXPR_CUDA_KERNEL_CALL;
1396 }
1397 
1398 //===----------------------------------------------------------------------===//
1399 // OpenCL Expressions and Statements.
1400 //===----------------------------------------------------------------------===//
1401 void ASTStmtWriter::VisitAsTypeExpr(AsTypeExpr *E) {
1402   VisitExpr(E);
1403   Writer.AddSourceLocation(E->getBuiltinLoc(), Record);
1404   Writer.AddSourceLocation(E->getRParenLoc(), Record);
1405   Writer.AddStmt(E->getSrcExpr());
1406   Code = serialization::EXPR_ASTYPE;
1407 }
1408 
1409 //===----------------------------------------------------------------------===//
1410 // Microsoft Expressions and Statements.
1411 //===----------------------------------------------------------------------===//
1412 void ASTStmtWriter::VisitCXXUuidofExpr(CXXUuidofExpr *E) {
1413   VisitExpr(E);
1414   Writer.AddSourceRange(E->getSourceRange(), Record);
1415   if (E->isTypeOperand()) {
1416     Writer.AddTypeSourceInfo(E->getTypeOperandSourceInfo(), Record);
1417     Code = serialization::EXPR_CXX_UUIDOF_TYPE;
1418   } else {
1419     Writer.AddStmt(E->getExprOperand());
1420     Code = serialization::EXPR_CXX_UUIDOF_EXPR;
1421   }
1422 }
1423 
1424 void ASTStmtWriter::VisitSEHExceptStmt(SEHExceptStmt *S) {
1425   VisitStmt(S);
1426   Writer.AddSourceLocation(S->getExceptLoc(), Record);
1427   Writer.AddStmt(S->getFilterExpr());
1428   Writer.AddStmt(S->getBlock());
1429   Code = serialization::STMT_SEH_EXCEPT;
1430 }
1431 
1432 void ASTStmtWriter::VisitSEHFinallyStmt(SEHFinallyStmt *S) {
1433   VisitStmt(S);
1434   Writer.AddSourceLocation(S->getFinallyLoc(), Record);
1435   Writer.AddStmt(S->getBlock());
1436   Code = serialization::STMT_SEH_FINALLY;
1437 }
1438 
1439 void ASTStmtWriter::VisitSEHTryStmt(SEHTryStmt *S) {
1440   VisitStmt(S);
1441   Record.push_back(S->getIsCXXTry());
1442   Writer.AddSourceLocation(S->getTryLoc(), Record);
1443   Writer.AddStmt(S->getTryBlock());
1444   Writer.AddStmt(S->getHandler());
1445   Code = serialization::STMT_SEH_TRY;
1446 }
1447 
1448 //===----------------------------------------------------------------------===//
1449 // ASTWriter Implementation
1450 //===----------------------------------------------------------------------===//
1451 
1452 unsigned ASTWriter::RecordSwitchCaseID(SwitchCase *S) {
1453   assert(SwitchCaseIDs.find(S) == SwitchCaseIDs.end() &&
1454          "SwitchCase recorded twice");
1455   unsigned NextID = SwitchCaseIDs.size();
1456   SwitchCaseIDs[S] = NextID;
1457   return NextID;
1458 }
1459 
1460 unsigned ASTWriter::getSwitchCaseID(SwitchCase *S) {
1461   assert(SwitchCaseIDs.find(S) != SwitchCaseIDs.end() &&
1462          "SwitchCase hasn't been seen yet");
1463   return SwitchCaseIDs[S];
1464 }
1465 
1466 void ASTWriter::ClearSwitchCaseIDs() {
1467   SwitchCaseIDs.clear();
1468 }
1469 
1470 /// \brief Write the given substatement or subexpression to the
1471 /// bitstream.
1472 void ASTWriter::WriteSubStmt(Stmt *S,
1473                              llvm::DenseMap<Stmt *, uint64_t> &SubStmtEntries,
1474                              llvm::DenseSet<Stmt *> &ParentStmts) {
1475   RecordData Record;
1476   ASTStmtWriter Writer(*this, Record);
1477   ++NumStatements;
1478 
1479   if (!S) {
1480     Stream.EmitRecord(serialization::STMT_NULL_PTR, Record);
1481     return;
1482   }
1483 
1484   llvm::DenseMap<Stmt *, uint64_t>::iterator I = SubStmtEntries.find(S);
1485   if (I != SubStmtEntries.end()) {
1486     Record.push_back(I->second);
1487     Stream.EmitRecord(serialization::STMT_REF_PTR, Record);
1488     return;
1489   }
1490 
1491 #ifndef NDEBUG
1492   assert(!ParentStmts.count(S) && "There is a Stmt cycle!");
1493 
1494   struct ParentStmtInserterRAII {
1495     Stmt *S;
1496     llvm::DenseSet<Stmt *> &ParentStmts;
1497 
1498     ParentStmtInserterRAII(Stmt *S, llvm::DenseSet<Stmt *> &ParentStmts)
1499       : S(S), ParentStmts(ParentStmts) {
1500       ParentStmts.insert(S);
1501     }
1502     ~ParentStmtInserterRAII() {
1503       ParentStmts.erase(S);
1504     }
1505   };
1506 
1507   ParentStmtInserterRAII ParentStmtInserter(S, ParentStmts);
1508 #endif
1509 
1510   // Redirect ASTWriter::AddStmt to collect sub stmts.
1511   SmallVector<Stmt *, 16> SubStmts;
1512   CollectedStmts = &SubStmts;
1513 
1514   Writer.Code = serialization::STMT_NULL_PTR;
1515   Writer.AbbrevToUse = 0;
1516   Writer.Visit(S);
1517 
1518 #ifndef NDEBUG
1519   if (Writer.Code == serialization::STMT_NULL_PTR) {
1520     SourceManager &SrcMgr
1521       = DeclIDs.begin()->first->getASTContext().getSourceManager();
1522     S->dump(SrcMgr);
1523     llvm_unreachable("Unhandled sub statement writing AST file");
1524   }
1525 #endif
1526 
1527   // Revert ASTWriter::AddStmt.
1528   CollectedStmts = &StmtsToEmit;
1529 
1530   // Write the sub stmts in reverse order, last to first. When reading them back
1531   // we will read them in correct order by "pop"ing them from the Stmts stack.
1532   // This simplifies reading and allows to store a variable number of sub stmts
1533   // without knowing it in advance.
1534   while (!SubStmts.empty())
1535     WriteSubStmt(SubStmts.pop_back_val(), SubStmtEntries, ParentStmts);
1536 
1537   Stream.EmitRecord(Writer.Code, Record, Writer.AbbrevToUse);
1538 
1539   SubStmtEntries[S] = Stream.GetCurrentBitNo();
1540 }
1541 
1542 /// \brief Flush all of the statements that have been added to the
1543 /// queue via AddStmt().
1544 void ASTWriter::FlushStmts() {
1545   RecordData Record;
1546 
1547   /// \brief Set of parent Stmts for the currently serializing sub stmt.
1548   llvm::DenseSet<Stmt *> ParentStmts;
1549   /// \brief Offsets of sub stmts already serialized. The offset points
1550   /// just after the stmt record.
1551   llvm::DenseMap<Stmt *, uint64_t> SubStmtEntries;
1552 
1553   for (unsigned I = 0, N = StmtsToEmit.size(); I != N; ++I) {
1554     WriteSubStmt(StmtsToEmit[I], SubStmtEntries, ParentStmts);
1555 
1556     assert(N == StmtsToEmit.size() &&
1557            "Substatement written via AddStmt rather than WriteSubStmt!");
1558 
1559     // Note that we are at the end of a full expression. Any
1560     // expression records that follow this one are part of a different
1561     // expression.
1562     Stream.EmitRecord(serialization::STMT_STOP, Record);
1563 
1564     SubStmtEntries.clear();
1565     ParentStmts.clear();
1566   }
1567 
1568   StmtsToEmit.clear();
1569 }
1570