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1 //===--- Transforms.cpp - Transformations to ARC mode ---------------------===//
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 #include "Transforms.h"
11 #include "Internals.h"
12 #include "clang/AST/ASTContext.h"
13 #include "clang/AST/RecursiveASTVisitor.h"
14 #include "clang/AST/StmtVisitor.h"
15 #include "clang/Analysis/DomainSpecific/CocoaConventions.h"
16 #include "clang/Basic/SourceManager.h"
17 #include "clang/Basic/TargetInfo.h"
18 #include "clang/Lex/Lexer.h"
19 #include "clang/Lex/Preprocessor.h"
20 #include "clang/Sema/Sema.h"
21 #include "clang/Sema/SemaDiagnostic.h"
22 #include "llvm/ADT/DenseSet.h"
23 #include "llvm/ADT/StringSwitch.h"
24 #include <map>
25 
26 using namespace clang;
27 using namespace arcmt;
28 using namespace trans;
29 
~ASTTraverser()30 ASTTraverser::~ASTTraverser() { }
31 
CFBridgingFunctionsDefined()32 bool MigrationPass::CFBridgingFunctionsDefined() {
33   if (!EnableCFBridgeFns.hasValue())
34     EnableCFBridgeFns = SemaRef.isKnownName("CFBridgingRetain") &&
35                         SemaRef.isKnownName("CFBridgingRelease");
36   return *EnableCFBridgeFns;
37 }
38 
39 //===----------------------------------------------------------------------===//
40 // Helpers.
41 //===----------------------------------------------------------------------===//
42 
canApplyWeak(ASTContext & Ctx,QualType type,bool AllowOnUnknownClass)43 bool trans::canApplyWeak(ASTContext &Ctx, QualType type,
44                          bool AllowOnUnknownClass) {
45   if (!Ctx.getLangOpts().ObjCWeakRuntime)
46     return false;
47 
48   QualType T = type;
49   if (T.isNull())
50     return false;
51 
52   // iOS is always safe to use 'weak'.
53   if (Ctx.getTargetInfo().getTriple().isiOS() ||
54       Ctx.getTargetInfo().getTriple().isWatchOS())
55     AllowOnUnknownClass = true;
56 
57   while (const PointerType *ptr = T->getAs<PointerType>())
58     T = ptr->getPointeeType();
59   if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) {
60     ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl();
61     if (!AllowOnUnknownClass && (!Class || Class->getName() == "NSObject"))
62       return false; // id/NSObject is not safe for weak.
63     if (!AllowOnUnknownClass && !Class->hasDefinition())
64       return false; // forward classes are not verifiable, therefore not safe.
65     if (Class && Class->isArcWeakrefUnavailable())
66       return false;
67   }
68 
69   return true;
70 }
71 
isPlusOneAssign(const BinaryOperator * E)72 bool trans::isPlusOneAssign(const BinaryOperator *E) {
73   if (E->getOpcode() != BO_Assign)
74     return false;
75 
76   return isPlusOne(E->getRHS());
77 }
78 
isPlusOne(const Expr * E)79 bool trans::isPlusOne(const Expr *E) {
80   if (!E)
81     return false;
82   if (const ExprWithCleanups *EWC = dyn_cast<ExprWithCleanups>(E))
83     E = EWC->getSubExpr();
84 
85   if (const ObjCMessageExpr *
86         ME = dyn_cast<ObjCMessageExpr>(E->IgnoreParenCasts()))
87     if (ME->getMethodFamily() == OMF_retain)
88       return true;
89 
90   if (const CallExpr *
91         callE = dyn_cast<CallExpr>(E->IgnoreParenCasts())) {
92     if (const FunctionDecl *FD = callE->getDirectCallee()) {
93       if (FD->hasAttr<CFReturnsRetainedAttr>())
94         return true;
95 
96       if (FD->isGlobal() &&
97           FD->getIdentifier() &&
98           FD->getParent()->isTranslationUnit() &&
99           FD->isExternallyVisible() &&
100           ento::cocoa::isRefType(callE->getType(), "CF",
101                                  FD->getIdentifier()->getName())) {
102         StringRef fname = FD->getIdentifier()->getName();
103         if (fname.endswith("Retain") ||
104             fname.find("Create") != StringRef::npos ||
105             fname.find("Copy") != StringRef::npos) {
106           return true;
107         }
108       }
109     }
110   }
111 
112   const ImplicitCastExpr *implCE = dyn_cast<ImplicitCastExpr>(E);
113   while (implCE && implCE->getCastKind() ==  CK_BitCast)
114     implCE = dyn_cast<ImplicitCastExpr>(implCE->getSubExpr());
115 
116   return implCE && implCE->getCastKind() == CK_ARCConsumeObject;
117 }
118 
119 /// \brief 'Loc' is the end of a statement range. This returns the location
120 /// immediately after the semicolon following the statement.
121 /// If no semicolon is found or the location is inside a macro, the returned
122 /// source location will be invalid.
findLocationAfterSemi(SourceLocation loc,ASTContext & Ctx,bool IsDecl)123 SourceLocation trans::findLocationAfterSemi(SourceLocation loc,
124                                             ASTContext &Ctx, bool IsDecl) {
125   SourceLocation SemiLoc = findSemiAfterLocation(loc, Ctx, IsDecl);
126   if (SemiLoc.isInvalid())
127     return SourceLocation();
128   return SemiLoc.getLocWithOffset(1);
129 }
130 
131 /// \brief \arg Loc is the end of a statement range. This returns the location
132 /// of the semicolon following the statement.
133 /// If no semicolon is found or the location is inside a macro, the returned
134 /// source location will be invalid.
findSemiAfterLocation(SourceLocation loc,ASTContext & Ctx,bool IsDecl)135 SourceLocation trans::findSemiAfterLocation(SourceLocation loc,
136                                             ASTContext &Ctx,
137                                             bool IsDecl) {
138   SourceManager &SM = Ctx.getSourceManager();
139   if (loc.isMacroID()) {
140     if (!Lexer::isAtEndOfMacroExpansion(loc, SM, Ctx.getLangOpts(), &loc))
141       return SourceLocation();
142   }
143   loc = Lexer::getLocForEndOfToken(loc, /*Offset=*/0, SM, Ctx.getLangOpts());
144 
145   // Break down the source location.
146   std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(loc);
147 
148   // Try to load the file buffer.
149   bool invalidTemp = false;
150   StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
151   if (invalidTemp)
152     return SourceLocation();
153 
154   const char *tokenBegin = file.data() + locInfo.second;
155 
156   // Lex from the start of the given location.
157   Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
158               Ctx.getLangOpts(),
159               file.begin(), tokenBegin, file.end());
160   Token tok;
161   lexer.LexFromRawLexer(tok);
162   if (tok.isNot(tok::semi)) {
163     if (!IsDecl)
164       return SourceLocation();
165     // Declaration may be followed with other tokens; such as an __attribute,
166     // before ending with a semicolon.
167     return findSemiAfterLocation(tok.getLocation(), Ctx, /*IsDecl*/true);
168   }
169 
170   return tok.getLocation();
171 }
172 
hasSideEffects(Expr * E,ASTContext & Ctx)173 bool trans::hasSideEffects(Expr *E, ASTContext &Ctx) {
174   if (!E || !E->HasSideEffects(Ctx))
175     return false;
176 
177   E = E->IgnoreParenCasts();
178   ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E);
179   if (!ME)
180     return true;
181   switch (ME->getMethodFamily()) {
182   case OMF_autorelease:
183   case OMF_dealloc:
184   case OMF_release:
185   case OMF_retain:
186     switch (ME->getReceiverKind()) {
187     case ObjCMessageExpr::SuperInstance:
188       return false;
189     case ObjCMessageExpr::Instance:
190       return hasSideEffects(ME->getInstanceReceiver(), Ctx);
191     default:
192       break;
193     }
194     break;
195   default:
196     break;
197   }
198 
199   return true;
200 }
201 
isGlobalVar(Expr * E)202 bool trans::isGlobalVar(Expr *E) {
203   E = E->IgnoreParenCasts();
204   if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
205     return DRE->getDecl()->getDeclContext()->isFileContext() &&
206            DRE->getDecl()->isExternallyVisible();
207   if (ConditionalOperator *condOp = dyn_cast<ConditionalOperator>(E))
208     return isGlobalVar(condOp->getTrueExpr()) &&
209            isGlobalVar(condOp->getFalseExpr());
210 
211   return false;
212 }
213 
getNilString(MigrationPass & Pass)214 StringRef trans::getNilString(MigrationPass &Pass) {
215   return Pass.SemaRef.PP.isMacroDefined("nil") ? "nil" : "0";
216 }
217 
218 namespace {
219 
220 class ReferenceClear : public RecursiveASTVisitor<ReferenceClear> {
221   ExprSet &Refs;
222 public:
ReferenceClear(ExprSet & refs)223   ReferenceClear(ExprSet &refs) : Refs(refs) { }
VisitDeclRefExpr(DeclRefExpr * E)224   bool VisitDeclRefExpr(DeclRefExpr *E) { Refs.erase(E); return true; }
225 };
226 
227 class ReferenceCollector : public RecursiveASTVisitor<ReferenceCollector> {
228   ValueDecl *Dcl;
229   ExprSet &Refs;
230 
231 public:
ReferenceCollector(ValueDecl * D,ExprSet & refs)232   ReferenceCollector(ValueDecl *D, ExprSet &refs)
233     : Dcl(D), Refs(refs) { }
234 
VisitDeclRefExpr(DeclRefExpr * E)235   bool VisitDeclRefExpr(DeclRefExpr *E) {
236     if (E->getDecl() == Dcl)
237       Refs.insert(E);
238     return true;
239   }
240 };
241 
242 class RemovablesCollector : public RecursiveASTVisitor<RemovablesCollector> {
243   ExprSet &Removables;
244 
245 public:
RemovablesCollector(ExprSet & removables)246   RemovablesCollector(ExprSet &removables)
247   : Removables(removables) { }
248 
shouldWalkTypesOfTypeLocs() const249   bool shouldWalkTypesOfTypeLocs() const { return false; }
250 
TraverseStmtExpr(StmtExpr * E)251   bool TraverseStmtExpr(StmtExpr *E) {
252     CompoundStmt *S = E->getSubStmt();
253     for (CompoundStmt::body_iterator
254         I = S->body_begin(), E = S->body_end(); I != E; ++I) {
255       if (I != E - 1)
256         mark(*I);
257       TraverseStmt(*I);
258     }
259     return true;
260   }
261 
VisitCompoundStmt(CompoundStmt * S)262   bool VisitCompoundStmt(CompoundStmt *S) {
263     for (auto *I : S->body())
264       mark(I);
265     return true;
266   }
267 
VisitIfStmt(IfStmt * S)268   bool VisitIfStmt(IfStmt *S) {
269     mark(S->getThen());
270     mark(S->getElse());
271     return true;
272   }
273 
VisitWhileStmt(WhileStmt * S)274   bool VisitWhileStmt(WhileStmt *S) {
275     mark(S->getBody());
276     return true;
277   }
278 
VisitDoStmt(DoStmt * S)279   bool VisitDoStmt(DoStmt *S) {
280     mark(S->getBody());
281     return true;
282   }
283 
VisitForStmt(ForStmt * S)284   bool VisitForStmt(ForStmt *S) {
285     mark(S->getInit());
286     mark(S->getInc());
287     mark(S->getBody());
288     return true;
289   }
290 
291 private:
mark(Stmt * S)292   void mark(Stmt *S) {
293     if (!S) return;
294 
295     while (LabelStmt *Label = dyn_cast<LabelStmt>(S))
296       S = Label->getSubStmt();
297     S = S->IgnoreImplicit();
298     if (Expr *E = dyn_cast<Expr>(S))
299       Removables.insert(E);
300   }
301 };
302 
303 } // end anonymous namespace
304 
clearRefsIn(Stmt * S,ExprSet & refs)305 void trans::clearRefsIn(Stmt *S, ExprSet &refs) {
306   ReferenceClear(refs).TraverseStmt(S);
307 }
308 
collectRefs(ValueDecl * D,Stmt * S,ExprSet & refs)309 void trans::collectRefs(ValueDecl *D, Stmt *S, ExprSet &refs) {
310   ReferenceCollector(D, refs).TraverseStmt(S);
311 }
312 
collectRemovables(Stmt * S,ExprSet & exprs)313 void trans::collectRemovables(Stmt *S, ExprSet &exprs) {
314   RemovablesCollector(exprs).TraverseStmt(S);
315 }
316 
317 //===----------------------------------------------------------------------===//
318 // MigrationContext
319 //===----------------------------------------------------------------------===//
320 
321 namespace {
322 
323 class ASTTransform : public RecursiveASTVisitor<ASTTransform> {
324   MigrationContext &MigrateCtx;
325   typedef RecursiveASTVisitor<ASTTransform> base;
326 
327 public:
ASTTransform(MigrationContext & MigrateCtx)328   ASTTransform(MigrationContext &MigrateCtx) : MigrateCtx(MigrateCtx) { }
329 
shouldWalkTypesOfTypeLocs() const330   bool shouldWalkTypesOfTypeLocs() const { return false; }
331 
TraverseObjCImplementationDecl(ObjCImplementationDecl * D)332   bool TraverseObjCImplementationDecl(ObjCImplementationDecl *D) {
333     ObjCImplementationContext ImplCtx(MigrateCtx, D);
334     for (MigrationContext::traverser_iterator
335            I = MigrateCtx.traversers_begin(),
336            E = MigrateCtx.traversers_end(); I != E; ++I)
337       (*I)->traverseObjCImplementation(ImplCtx);
338 
339     return base::TraverseObjCImplementationDecl(D);
340   }
341 
TraverseStmt(Stmt * rootS)342   bool TraverseStmt(Stmt *rootS) {
343     if (!rootS)
344       return true;
345 
346     BodyContext BodyCtx(MigrateCtx, rootS);
347     for (MigrationContext::traverser_iterator
348            I = MigrateCtx.traversers_begin(),
349            E = MigrateCtx.traversers_end(); I != E; ++I)
350       (*I)->traverseBody(BodyCtx);
351 
352     return true;
353   }
354 };
355 
356 }
357 
~MigrationContext()358 MigrationContext::~MigrationContext() {
359   for (traverser_iterator
360          I = traversers_begin(), E = traversers_end(); I != E; ++I)
361     delete *I;
362 }
363 
isGCOwnedNonObjC(QualType T)364 bool MigrationContext::isGCOwnedNonObjC(QualType T) {
365   while (!T.isNull()) {
366     if (const AttributedType *AttrT = T->getAs<AttributedType>()) {
367       if (AttrT->getAttrKind() == AttributedType::attr_objc_ownership)
368         return !AttrT->getModifiedType()->isObjCRetainableType();
369     }
370 
371     if (T->isArrayType())
372       T = Pass.Ctx.getBaseElementType(T);
373     else if (const PointerType *PT = T->getAs<PointerType>())
374       T = PT->getPointeeType();
375     else if (const ReferenceType *RT = T->getAs<ReferenceType>())
376       T = RT->getPointeeType();
377     else
378       break;
379   }
380 
381   return false;
382 }
383 
rewritePropertyAttribute(StringRef fromAttr,StringRef toAttr,SourceLocation atLoc)384 bool MigrationContext::rewritePropertyAttribute(StringRef fromAttr,
385                                                 StringRef toAttr,
386                                                 SourceLocation atLoc) {
387   if (atLoc.isMacroID())
388     return false;
389 
390   SourceManager &SM = Pass.Ctx.getSourceManager();
391 
392   // Break down the source location.
393   std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc);
394 
395   // Try to load the file buffer.
396   bool invalidTemp = false;
397   StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
398   if (invalidTemp)
399     return false;
400 
401   const char *tokenBegin = file.data() + locInfo.second;
402 
403   // Lex from the start of the given location.
404   Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
405               Pass.Ctx.getLangOpts(),
406               file.begin(), tokenBegin, file.end());
407   Token tok;
408   lexer.LexFromRawLexer(tok);
409   if (tok.isNot(tok::at)) return false;
410   lexer.LexFromRawLexer(tok);
411   if (tok.isNot(tok::raw_identifier)) return false;
412   if (tok.getRawIdentifier() != "property")
413     return false;
414   lexer.LexFromRawLexer(tok);
415   if (tok.isNot(tok::l_paren)) return false;
416 
417   Token BeforeTok = tok;
418   Token AfterTok;
419   AfterTok.startToken();
420   SourceLocation AttrLoc;
421 
422   lexer.LexFromRawLexer(tok);
423   if (tok.is(tok::r_paren))
424     return false;
425 
426   while (1) {
427     if (tok.isNot(tok::raw_identifier)) return false;
428     if (tok.getRawIdentifier() == fromAttr) {
429       if (!toAttr.empty()) {
430         Pass.TA.replaceText(tok.getLocation(), fromAttr, toAttr);
431         return true;
432       }
433       // We want to remove the attribute.
434       AttrLoc = tok.getLocation();
435     }
436 
437     do {
438       lexer.LexFromRawLexer(tok);
439       if (AttrLoc.isValid() && AfterTok.is(tok::unknown))
440         AfterTok = tok;
441     } while (tok.isNot(tok::comma) && tok.isNot(tok::r_paren));
442     if (tok.is(tok::r_paren))
443       break;
444     if (AttrLoc.isInvalid())
445       BeforeTok = tok;
446     lexer.LexFromRawLexer(tok);
447   }
448 
449   if (toAttr.empty() && AttrLoc.isValid() && AfterTok.isNot(tok::unknown)) {
450     // We want to remove the attribute.
451     if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::r_paren)) {
452       Pass.TA.remove(SourceRange(BeforeTok.getLocation(),
453                                  AfterTok.getLocation()));
454     } else if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::comma)) {
455       Pass.TA.remove(SourceRange(AttrLoc, AfterTok.getLocation()));
456     } else {
457       Pass.TA.remove(SourceRange(BeforeTok.getLocation(), AttrLoc));
458     }
459 
460     return true;
461   }
462 
463   return false;
464 }
465 
addPropertyAttribute(StringRef attr,SourceLocation atLoc)466 bool MigrationContext::addPropertyAttribute(StringRef attr,
467                                             SourceLocation atLoc) {
468   if (atLoc.isMacroID())
469     return false;
470 
471   SourceManager &SM = Pass.Ctx.getSourceManager();
472 
473   // Break down the source location.
474   std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc);
475 
476   // Try to load the file buffer.
477   bool invalidTemp = false;
478   StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
479   if (invalidTemp)
480     return false;
481 
482   const char *tokenBegin = file.data() + locInfo.second;
483 
484   // Lex from the start of the given location.
485   Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
486               Pass.Ctx.getLangOpts(),
487               file.begin(), tokenBegin, file.end());
488   Token tok;
489   lexer.LexFromRawLexer(tok);
490   if (tok.isNot(tok::at)) return false;
491   lexer.LexFromRawLexer(tok);
492   if (tok.isNot(tok::raw_identifier)) return false;
493   if (tok.getRawIdentifier() != "property")
494     return false;
495   lexer.LexFromRawLexer(tok);
496 
497   if (tok.isNot(tok::l_paren)) {
498     Pass.TA.insert(tok.getLocation(), std::string("(") + attr.str() + ") ");
499     return true;
500   }
501 
502   lexer.LexFromRawLexer(tok);
503   if (tok.is(tok::r_paren)) {
504     Pass.TA.insert(tok.getLocation(), attr);
505     return true;
506   }
507 
508   if (tok.isNot(tok::raw_identifier)) return false;
509 
510   Pass.TA.insert(tok.getLocation(), std::string(attr) + ", ");
511   return true;
512 }
513 
traverse(TranslationUnitDecl * TU)514 void MigrationContext::traverse(TranslationUnitDecl *TU) {
515   for (traverser_iterator
516          I = traversers_begin(), E = traversers_end(); I != E; ++I)
517     (*I)->traverseTU(*this);
518 
519   ASTTransform(*this).TraverseDecl(TU);
520 }
521 
GCRewriteFinalize(MigrationPass & pass)522 static void GCRewriteFinalize(MigrationPass &pass) {
523   ASTContext &Ctx = pass.Ctx;
524   TransformActions &TA = pass.TA;
525   DeclContext *DC = Ctx.getTranslationUnitDecl();
526   Selector FinalizeSel =
527    Ctx.Selectors.getNullarySelector(&pass.Ctx.Idents.get("finalize"));
528 
529   typedef DeclContext::specific_decl_iterator<ObjCImplementationDecl>
530   impl_iterator;
531   for (impl_iterator I = impl_iterator(DC->decls_begin()),
532        E = impl_iterator(DC->decls_end()); I != E; ++I) {
533     for (const auto *MD : I->instance_methods()) {
534       if (!MD->hasBody())
535         continue;
536 
537       if (MD->isInstanceMethod() && MD->getSelector() == FinalizeSel) {
538         const ObjCMethodDecl *FinalizeM = MD;
539         Transaction Trans(TA);
540         TA.insert(FinalizeM->getSourceRange().getBegin(),
541                   "#if !__has_feature(objc_arc)\n");
542         CharSourceRange::getTokenRange(FinalizeM->getSourceRange());
543         const SourceManager &SM = pass.Ctx.getSourceManager();
544         const LangOptions &LangOpts = pass.Ctx.getLangOpts();
545         bool Invalid;
546         std::string str = "\n#endif\n";
547         str += Lexer::getSourceText(
548                   CharSourceRange::getTokenRange(FinalizeM->getSourceRange()),
549                                     SM, LangOpts, &Invalid);
550         TA.insertAfterToken(FinalizeM->getSourceRange().getEnd(), str);
551 
552         break;
553       }
554     }
555   }
556 }
557 
558 //===----------------------------------------------------------------------===//
559 // getAllTransformations.
560 //===----------------------------------------------------------------------===//
561 
traverseAST(MigrationPass & pass)562 static void traverseAST(MigrationPass &pass) {
563   MigrationContext MigrateCtx(pass);
564 
565   if (pass.isGCMigration()) {
566     MigrateCtx.addTraverser(new GCCollectableCallsTraverser);
567     MigrateCtx.addTraverser(new GCAttrsTraverser());
568   }
569   MigrateCtx.addTraverser(new PropertyRewriteTraverser());
570   MigrateCtx.addTraverser(new BlockObjCVariableTraverser());
571   MigrateCtx.addTraverser(new ProtectedScopeTraverser());
572 
573   MigrateCtx.traverse(pass.Ctx.getTranslationUnitDecl());
574 }
575 
independentTransforms(MigrationPass & pass)576 static void independentTransforms(MigrationPass &pass) {
577   rewriteAutoreleasePool(pass);
578   removeRetainReleaseDeallocFinalize(pass);
579   rewriteUnusedInitDelegate(pass);
580   removeZeroOutPropsInDeallocFinalize(pass);
581   makeAssignARCSafe(pass);
582   rewriteUnbridgedCasts(pass);
583   checkAPIUses(pass);
584   traverseAST(pass);
585 }
586 
getAllTransformations(LangOptions::GCMode OrigGCMode,bool NoFinalizeRemoval)587 std::vector<TransformFn> arcmt::getAllTransformations(
588                                                LangOptions::GCMode OrigGCMode,
589                                                bool NoFinalizeRemoval) {
590   std::vector<TransformFn> transforms;
591 
592   if (OrigGCMode ==  LangOptions::GCOnly && NoFinalizeRemoval)
593     transforms.push_back(GCRewriteFinalize);
594   transforms.push_back(independentTransforms);
595   // This depends on previous transformations removing various expressions.
596   transforms.push_back(removeEmptyStatementsAndDeallocFinalize);
597 
598   return transforms;
599 }
600