CGDecl.cpp revision 9e8725a434cd70ab74fa914554d7933a4bb1e501 
1//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
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 contains code to emit Decl nodes as LLVM code.
11//
12//===----------------------------------------------------------------------===//
13
14#include "CGDebugInfo.h"
15#include "CodeGenFunction.h"
16#include "CodeGenModule.h"
17#include "clang/AST/ASTContext.h"
18#include "clang/AST/Decl.h"
19#include "clang/AST/DeclObjC.h"
20#include "clang/Basic/SourceManager.h"
21#include "clang/Basic/TargetInfo.h"
22#include "llvm/GlobalVariable.h"
23#include "llvm/Intrinsics.h"
24#include "llvm/Target/TargetData.h"
25#include "llvm/Type.h"
26using namespace clang;
27using namespace CodeGen;
28
29
30void CodeGenFunction::EmitDecl(const Decl &D) {
31  switch (D.getKind()) {
32  default: assert(0 && "Unknown decl kind!");
33  case Decl::ParmVar:
34    assert(0 && "Parmdecls should not be in declstmts!");
35  case Decl::Function:  // void X();
36  case Decl::Record:    // struct/union/class X;
37  case Decl::Enum:      // enum X;
38  case Decl::EnumConstant: // enum ? { X = ? }
39  case Decl::CXXRecord: // struct/union/class X; [C++]
40    // None of these decls require codegen support.
41    return;
42
43  case Decl::Var: {
44    const VarDecl &VD = cast<VarDecl>(D);
45    assert(VD.isBlockVarDecl() &&
46           "Should not see file-scope variables inside a function!");
47    return EmitBlockVarDecl(VD);
48  }
49
50  case Decl::Typedef: {   // typedef int X;
51    const TypedefDecl &TD = cast<TypedefDecl>(D);
52    QualType Ty = TD.getUnderlyingType();
53
54    if (Ty->isVariablyModifiedType())
55      EmitVLASize(Ty);
56  }
57  }
58}
59
60/// EmitBlockVarDecl - This method handles emission of any variable declaration
61/// inside a function, including static vars etc.
62void CodeGenFunction::EmitBlockVarDecl(const VarDecl &D) {
63  if (D.hasAttr<AsmLabelAttr>())
64    CGM.ErrorUnsupported(&D, "__asm__");
65
66  switch (D.getStorageClass()) {
67  case VarDecl::None:
68  case VarDecl::Auto:
69  case VarDecl::Register:
70    return EmitLocalBlockVarDecl(D);
71  case VarDecl::Static:
72    return EmitStaticBlockVarDecl(D);
73  case VarDecl::Extern:
74  case VarDecl::PrivateExtern:
75    // Don't emit it now, allow it to be emitted lazily on its first use.
76    return;
77  }
78
79  assert(0 && "Unknown storage class");
80}
81
82llvm::GlobalVariable *
83CodeGenFunction::CreateStaticBlockVarDecl(const VarDecl &D,
84                                          const char *Separator,
85                                          llvm::GlobalValue::LinkageTypes
86                                          Linkage) {
87  QualType Ty = D.getType();
88  assert(Ty->isConstantSizeType() && "VLAs can't be static");
89
90  std::string Name;
91  if (getContext().getLangOptions().CPlusPlus) {
92    Name = CGM.getMangledName(&D);
93  } else {
94    std::string ContextName;
95    if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurFuncDecl))
96      ContextName = CGM.getMangledName(FD);
97    else if (isa<ObjCMethodDecl>(CurFuncDecl))
98      ContextName = CurFn->getName();
99    else
100      assert(0 && "Unknown context for block var decl");
101
102    Name = ContextName + Separator + D.getNameAsString();
103  }
104
105  const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(Ty);
106  return new llvm::GlobalVariable(CGM.getModule(), LTy,
107                                  Ty.isConstant(getContext()), Linkage,
108                                  CGM.EmitNullConstant(D.getType()), Name, 0,
109                                  D.isThreadSpecified(), Ty.getAddressSpace());
110}
111
112void CodeGenFunction::EmitStaticBlockVarDecl(const VarDecl &D) {
113  llvm::Value *&DMEntry = LocalDeclMap[&D];
114  assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
115
116  llvm::GlobalVariable *GV =
117    CreateStaticBlockVarDecl(D, ".", llvm::GlobalValue::InternalLinkage);
118
119  // Store into LocalDeclMap before generating initializer to handle
120  // circular references.
121  DMEntry = GV;
122
123  // Make sure to evaluate VLA bounds now so that we have them for later.
124  //
125  // FIXME: Can this happen?
126  if (D.getType()->isVariablyModifiedType())
127    EmitVLASize(D.getType());
128
129  if (D.getInit()) {
130    llvm::Constant *Init = CGM.EmitConstantExpr(D.getInit(), D.getType(), this);
131
132    // If constant emission failed, then this should be a C++ static
133    // initializer.
134    if (!Init) {
135      if (!getContext().getLangOptions().CPlusPlus)
136        CGM.ErrorUnsupported(D.getInit(), "constant l-value expression");
137      else
138        EmitStaticCXXBlockVarDeclInit(D, GV);
139    } else {
140      // The initializer may differ in type from the global. Rewrite
141      // the global to match the initializer.  (We have to do this
142      // because some types, like unions, can't be completely represented
143      // in the LLVM type system.)
144      if (GV->getType() != Init->getType()) {
145        llvm::GlobalVariable *OldGV = GV;
146
147        GV = new llvm::GlobalVariable(CGM.getModule(), Init->getType(),
148                                      OldGV->isConstant(),
149                                      OldGV->getLinkage(), Init, "",
150                                      0, D.isThreadSpecified(),
151                                      D.getType().getAddressSpace());
152
153        // Steal the name of the old global
154        GV->takeName(OldGV);
155
156        // Replace all uses of the old global with the new global
157        llvm::Constant *NewPtrForOldDecl =
158          llvm::ConstantExpr::getBitCast(GV, OldGV->getType());
159        OldGV->replaceAllUsesWith(NewPtrForOldDecl);
160
161        // Erase the old global, since it is no longer used.
162        OldGV->eraseFromParent();
163      }
164
165      GV->setInitializer(Init);
166    }
167  }
168
169  // FIXME: Merge attribute handling.
170  if (const AnnotateAttr *AA = D.getAttr<AnnotateAttr>()) {
171    SourceManager &SM = CGM.getContext().getSourceManager();
172    llvm::Constant *Ann =
173      CGM.EmitAnnotateAttr(GV, AA,
174                           SM.getInstantiationLineNumber(D.getLocation()));
175    CGM.AddAnnotation(Ann);
176  }
177
178  if (const SectionAttr *SA = D.getAttr<SectionAttr>())
179    GV->setSection(SA->getName());
180
181  if (D.hasAttr<UsedAttr>())
182    CGM.AddUsedGlobal(GV);
183
184  // We may have to cast the constant because of the initializer
185  // mismatch above.
186  //
187  // FIXME: It is really dangerous to store this in the map; if anyone
188  // RAUW's the GV uses of this constant will be invalid.
189  const llvm::Type *LTy = CGM.getTypes().ConvertTypeForMem(D.getType());
190  const llvm::Type *LPtrTy =
191    llvm::PointerType::get(LTy, D.getType().getAddressSpace());
192  DMEntry = llvm::ConstantExpr::getBitCast(GV, LPtrTy);
193
194  // Emit global variable debug descriptor for static vars.
195  CGDebugInfo *DI = getDebugInfo();
196  if (DI) {
197    DI->setLocation(D.getLocation());
198    DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(GV), &D);
199  }
200}
201
202unsigned CodeGenFunction::getByRefValueLLVMField(const ValueDecl *VD) const {
203  assert(ByRefValueInfo.count(VD) && "Did not find value!");
204
205  return ByRefValueInfo.find(VD)->second.second;
206}
207
208/// BuildByRefType - This routine changes a __block variable declared as T x
209///   into:
210///
211///      struct {
212///        void *__isa;
213///        void *__forwarding;
214///        int32_t __flags;
215///        int32_t __size;
216///        void *__copy_helper;
217///        void *__destroy_helper;
218///        T x;
219///      } x
220///
221const llvm::Type *CodeGenFunction::BuildByRefType(const ValueDecl *D) {
222  std::pair<const llvm::Type *, unsigned> &Info = ByRefValueInfo[D];
223  if (Info.first)
224    return Info.first;
225
226  QualType Ty = D->getType();
227
228  std::vector<const llvm::Type *> Types;
229
230  const llvm::PointerType *Int8PtrTy
231    = llvm::PointerType::getUnqual(llvm::Type::getInt8Ty(VMContext));
232
233  llvm::PATypeHolder ByRefTypeHolder = llvm::OpaqueType::get(VMContext);
234
235  // void *__isa;
236  Types.push_back(Int8PtrTy);
237
238  // void *__forwarding;
239  Types.push_back(llvm::PointerType::getUnqual(ByRefTypeHolder));
240
241  // int32_t __flags;
242  Types.push_back(llvm::Type::getInt32Ty(VMContext));
243
244  // int32_t __size;
245  Types.push_back(llvm::Type::getInt32Ty(VMContext));
246
247  bool HasCopyAndDispose = BlockRequiresCopying(Ty);
248  if (HasCopyAndDispose) {
249    /// void *__copy_helper;
250    Types.push_back(Int8PtrTy);
251
252    /// void *__destroy_helper;
253    Types.push_back(Int8PtrTy);
254  }
255
256  bool Packed = false;
257  unsigned Align = getContext().getDeclAlignInBytes(D);
258  if (Align > Target.getPointerAlign(0) / 8) {
259    // We have to insert padding.
260
261    // The struct above has 2 32-bit integers.
262    unsigned CurrentOffsetInBytes = 4 * 2;
263
264    // And either 2 or 4 pointers.
265    CurrentOffsetInBytes += (HasCopyAndDispose ? 4 : 2) *
266      CGM.getTargetData().getTypeAllocSize(Int8PtrTy);
267
268    // Align the offset.
269    unsigned AlignedOffsetInBytes =
270      llvm::RoundUpToAlignment(CurrentOffsetInBytes, Align);
271
272    unsigned NumPaddingBytes = AlignedOffsetInBytes - CurrentOffsetInBytes;
273    assert(NumPaddingBytes > 0 && "Can't append any padding!");
274
275    const llvm::Type *Ty = llvm::Type::getInt8Ty(VMContext);
276    // FIXME: We need a sema error for alignment larger than the minimum of the
277    // maximal stack alignmint and the alignment of malloc on the system.
278    if (NumPaddingBytes > 1)
279      Ty = llvm::ArrayType::get(Ty, NumPaddingBytes);
280
281    Types.push_back(Ty);
282
283    // We want a packed struct.
284    Packed = true;
285  }
286
287  // T x;
288  Types.push_back(ConvertType(Ty));
289
290  const llvm::Type *T = llvm::StructType::get(VMContext, Types, Packed);
291
292  cast<llvm::OpaqueType>(ByRefTypeHolder.get())->refineAbstractTypeTo(T);
293  CGM.getModule().addTypeName("struct.__block_byref_" + D->getNameAsString(),
294                              ByRefTypeHolder.get());
295
296  Info.first = ByRefTypeHolder.get();
297
298  Info.second = Types.size() - 1;
299
300  return Info.first;
301}
302
303/// EmitLocalBlockVarDecl - Emit code and set up an entry in LocalDeclMap for a
304/// variable declaration with auto, register, or no storage class specifier.
305/// These turn into simple stack objects, or GlobalValues depending on target.
306void CodeGenFunction::EmitLocalBlockVarDecl(const VarDecl &D) {
307  QualType Ty = D.getType();
308  bool isByRef = D.hasAttr<BlocksAttr>();
309  bool needsDispose = false;
310  unsigned Align = 0;
311
312  llvm::Value *DeclPtr;
313  if (Ty->isConstantSizeType()) {
314    if (!Target.useGlobalsForAutomaticVariables()) {
315      // A normal fixed sized variable becomes an alloca in the entry block.
316      const llvm::Type *LTy = ConvertTypeForMem(Ty);
317      Align = getContext().getDeclAlignInBytes(&D);
318      if (isByRef)
319        LTy = BuildByRefType(&D);
320      llvm::AllocaInst *Alloc = CreateTempAlloca(LTy);
321      Alloc->setName(D.getNameAsString().c_str());
322
323      if (isByRef)
324        Align = std::max(Align, unsigned(Target.getPointerAlign(0) / 8));
325      Alloc->setAlignment(Align);
326      DeclPtr = Alloc;
327    } else {
328      // Targets that don't support recursion emit locals as globals.
329      const char *Class =
330        D.getStorageClass() == VarDecl::Register ? ".reg." : ".auto.";
331      DeclPtr = CreateStaticBlockVarDecl(D, Class,
332                                         llvm::GlobalValue
333                                         ::InternalLinkage);
334    }
335
336    // FIXME: Can this happen?
337    if (Ty->isVariablyModifiedType())
338      EmitVLASize(Ty);
339  } else {
340    EnsureInsertPoint();
341
342    if (!DidCallStackSave) {
343      // Save the stack.
344      const llvm::Type *LTy =
345        llvm::PointerType::getUnqual(llvm::Type::getInt8Ty(VMContext));
346      llvm::Value *Stack = CreateTempAlloca(LTy, "saved_stack");
347
348      llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stacksave);
349      llvm::Value *V = Builder.CreateCall(F);
350
351      Builder.CreateStore(V, Stack);
352
353      DidCallStackSave = true;
354
355      {
356        // Push a cleanup block and restore the stack there.
357        CleanupScope scope(*this);
358
359        V = Builder.CreateLoad(Stack, "tmp");
360        llvm::Value *F = CGM.getIntrinsic(llvm::Intrinsic::stackrestore);
361        Builder.CreateCall(F, V);
362      }
363    }
364
365    // Get the element type.
366    const llvm::Type *LElemTy = ConvertTypeForMem(Ty);
367    const llvm::Type *LElemPtrTy =
368      llvm::PointerType::get(LElemTy, D.getType().getAddressSpace());
369
370    llvm::Value *VLASize = EmitVLASize(Ty);
371
372    // Downcast the VLA size expression
373    VLASize = Builder.CreateIntCast(VLASize, llvm::Type::getInt32Ty(VMContext),
374                                    false, "tmp");
375
376    // Allocate memory for the array.
377    llvm::Value *VLA = Builder.CreateAlloca(llvm::Type::getInt8Ty(VMContext),
378                                            VLASize, "vla");
379    DeclPtr = Builder.CreateBitCast(VLA, LElemPtrTy, "tmp");
380  }
381
382  llvm::Value *&DMEntry = LocalDeclMap[&D];
383  assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
384  DMEntry = DeclPtr;
385
386  // Emit debug info for local var declaration.
387  if (CGDebugInfo *DI = getDebugInfo()) {
388    assert(HaveInsertPoint() && "Unexpected unreachable point!");
389
390    DI->setLocation(D.getLocation());
391    if (Target.useGlobalsForAutomaticVariables()) {
392      DI->EmitGlobalVariable(static_cast<llvm::GlobalVariable *>(DeclPtr), &D);
393    } else if (isByRef) {
394      // FIXME: This code is broken and will not emit debug info for the
395      // variable. The right way to do this would be to tell LLVM that this is a
396      // byref pointer, and what the offset is. Unfortunately, right now it's
397      // not possible unless we create a DIType that corresponds to the byref
398      // struct.
399      /*
400      llvm::Value *Loc;
401      bool needsCopyDispose = BlockRequiresCopying(Ty);
402      Loc = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
403      Loc = Builder.CreateLoad(Loc, false);
404      Loc = Builder.CreateBitCast(Loc, DeclPtr->getType());
405      Loc = Builder.CreateStructGEP(Loc, needsCopyDispose*2+4, "x");
406      DI->EmitDeclareOfAutoVariable(&D, Loc, Builder);
407      */
408    } else
409      DI->EmitDeclareOfAutoVariable(&D, DeclPtr, Builder);
410  }
411
412  // If this local has an initializer, emit it now.
413  const Expr *Init = D.getInit();
414
415  // If we are at an unreachable point, we don't need to emit the initializer
416  // unless it contains a label.
417  if (!HaveInsertPoint()) {
418    if (!ContainsLabel(Init))
419      Init = 0;
420    else
421      EnsureInsertPoint();
422  }
423
424  if (Init) {
425    llvm::Value *Loc = DeclPtr;
426    if (isByRef)
427      Loc = Builder.CreateStructGEP(DeclPtr, getByRefValueLLVMField(&D),
428                                    D.getNameAsString());
429
430    if (Ty->isReferenceType()) {
431      RValue RV = EmitReferenceBindingToExpr(Init, Ty, /*IsInitializer=*/true);
432      EmitStoreOfScalar(RV.getScalarVal(), Loc, false, Ty);
433    } else if (!hasAggregateLLVMType(Init->getType())) {
434      llvm::Value *V = EmitScalarExpr(Init);
435      EmitStoreOfScalar(V, Loc, D.getType().isVolatileQualified(),
436                        D.getType());
437    } else if (Init->getType()->isAnyComplexType()) {
438      EmitComplexExprIntoAddr(Init, Loc, D.getType().isVolatileQualified());
439    } else {
440      EmitAggExpr(Init, Loc, D.getType().isVolatileQualified());
441    }
442  }
443
444  if (isByRef) {
445    const llvm::PointerType *PtrToInt8Ty
446      = llvm::PointerType::getUnqual(llvm::Type::getInt8Ty(VMContext));
447
448    EnsureInsertPoint();
449    llvm::Value *isa_field = Builder.CreateStructGEP(DeclPtr, 0);
450    llvm::Value *forwarding_field = Builder.CreateStructGEP(DeclPtr, 1);
451    llvm::Value *flags_field = Builder.CreateStructGEP(DeclPtr, 2);
452    llvm::Value *size_field = Builder.CreateStructGEP(DeclPtr, 3);
453    llvm::Value *V;
454    int flag = 0;
455    int flags = 0;
456
457    needsDispose = true;
458
459    if (Ty->isBlockPointerType()) {
460      flag |= BLOCK_FIELD_IS_BLOCK;
461      flags |= BLOCK_HAS_COPY_DISPOSE;
462    } else if (BlockRequiresCopying(Ty)) {
463      flag |= BLOCK_FIELD_IS_OBJECT;
464      flags |= BLOCK_HAS_COPY_DISPOSE;
465    }
466
467    // FIXME: Someone double check this.
468    if (Ty.isObjCGCWeak())
469      flag |= BLOCK_FIELD_IS_WEAK;
470
471    int isa = 0;
472    if (flag&BLOCK_FIELD_IS_WEAK)
473      isa = 1;
474    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), isa);
475    V = Builder.CreateIntToPtr(V, PtrToInt8Ty, "isa");
476    Builder.CreateStore(V, isa_field);
477
478    Builder.CreateStore(DeclPtr, forwarding_field);
479
480    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext), flags);
481    Builder.CreateStore(V, flags_field);
482
483    const llvm::Type *V1;
484    V1 = cast<llvm::PointerType>(DeclPtr->getType())->getElementType();
485    V = llvm::ConstantInt::get(llvm::Type::getInt32Ty(VMContext),
486                               (CGM.getTargetData().getTypeStoreSizeInBits(V1)
487                                / 8));
488    Builder.CreateStore(V, size_field);
489
490    if (flags & BLOCK_HAS_COPY_DISPOSE) {
491      BlockHasCopyDispose = true;
492      llvm::Value *copy_helper = Builder.CreateStructGEP(DeclPtr, 4);
493      Builder.CreateStore(BuildbyrefCopyHelper(DeclPtr->getType(), flag, Align),
494                          copy_helper);
495
496      llvm::Value *destroy_helper = Builder.CreateStructGEP(DeclPtr, 5);
497      Builder.CreateStore(BuildbyrefDestroyHelper(DeclPtr->getType(), flag,
498                                                  Align),
499                          destroy_helper);
500    }
501  }
502
503  // Handle CXX destruction of variables.
504  QualType DtorTy(Ty);
505  if (const ArrayType *Array = DtorTy->getAs<ArrayType>())
506    DtorTy = Array->getElementType();
507  if (const RecordType *RT = DtorTy->getAs<RecordType>())
508    if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
509      if (!ClassDecl->hasTrivialDestructor()) {
510        const CXXDestructorDecl *D = ClassDecl->getDestructor(getContext());
511        assert(D && "EmitLocalBlockVarDecl - destructor is nul");
512        assert(!Ty->getAs<ArrayType>() && "FIXME - destruction of arrays NYI");
513
514        CleanupScope scope(*this);
515        EmitCXXDestructorCall(D, Dtor_Complete, DeclPtr);
516      }
517  }
518
519  // Handle the cleanup attribute
520  if (const CleanupAttr *CA = D.getAttr<CleanupAttr>()) {
521    const FunctionDecl *FD = CA->getFunctionDecl();
522
523    llvm::Constant* F = CGM.GetAddrOfFunction(FD);
524    assert(F && "Could not find function!");
525
526    CleanupScope scope(*this);
527
528    const CGFunctionInfo &Info = CGM.getTypes().getFunctionInfo(FD);
529
530    // In some cases, the type of the function argument will be different from
531    // the type of the pointer. An example of this is
532    // void f(void* arg);
533    // __attribute__((cleanup(f))) void *g;
534    //
535    // To fix this we insert a bitcast here.
536    QualType ArgTy = Info.arg_begin()->type;
537    DeclPtr = Builder.CreateBitCast(DeclPtr, ConvertType(ArgTy));
538
539    CallArgList Args;
540    Args.push_back(std::make_pair(RValue::get(DeclPtr),
541                                  getContext().getPointerType(D.getType())));
542
543    EmitCall(Info, F, Args);
544  }
545
546  if (needsDispose && CGM.getLangOptions().getGCMode() != LangOptions::GCOnly) {
547    CleanupScope scope(*this);
548    llvm::Value *V = Builder.CreateStructGEP(DeclPtr, 1, "forwarding");
549    V = Builder.CreateLoad(V, false);
550    BuildBlockRelease(V);
551  }
552}
553
554/// Emit an alloca (or GlobalValue depending on target)
555/// for the specified parameter and set up LocalDeclMap.
556void CodeGenFunction::EmitParmDecl(const VarDecl &D, llvm::Value *Arg) {
557  // FIXME: Why isn't ImplicitParamDecl a ParmVarDecl?
558  assert((isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D)) &&
559         "Invalid argument to EmitParmDecl");
560  QualType Ty = D.getType();
561
562  llvm::Value *DeclPtr;
563  if (!Ty->isConstantSizeType()) {
564    // Variable sized values always are passed by-reference.
565    DeclPtr = Arg;
566  } else {
567    // A fixed sized single-value variable becomes an alloca in the entry block.
568    const llvm::Type *LTy = ConvertTypeForMem(Ty);
569    if (LTy->isSingleValueType()) {
570      // TODO: Alignment
571      std::string Name = D.getNameAsString();
572      Name += ".addr";
573      DeclPtr = CreateTempAlloca(LTy);
574      DeclPtr->setName(Name.c_str());
575
576      // Store the initial value into the alloca.
577      EmitStoreOfScalar(Arg, DeclPtr, Ty.isVolatileQualified(), Ty);
578    } else {
579      // Otherwise, if this is an aggregate, just use the input pointer.
580      DeclPtr = Arg;
581    }
582    Arg->setName(D.getNameAsString());
583  }
584
585  llvm::Value *&DMEntry = LocalDeclMap[&D];
586  assert(DMEntry == 0 && "Decl already exists in localdeclmap!");
587  DMEntry = DeclPtr;
588
589  // Emit debug info for param declaration.
590  if (CGDebugInfo *DI = getDebugInfo()) {
591    DI->setLocation(D.getLocation());
592    DI->EmitDeclareOfArgVariable(&D, DeclPtr, Builder);
593  }
594}
595
596