DebugInfo: Pass non-zero alignment to DIBuilder only if aligment was forced

[vleschuk]

Summary

Check for forced alignment (alignas(), _Alignas(), __attribute(aligned (N))))) when creating DI* objects with DIBuilder. If alignment was not forced pass zero, otherwise pass actual alignment value.

[aprantl]

lib/CodeGen/CGDebugInfo.cpp

990–991

Could you please do the re-formatting as a separate NFC commit? No need to for a separate review.
This makes reviewing, cherry-picking, and bisection much easier.

[vleschuk]

lib/CodeGen/CGDebugInfo.cpp

990–991

Sure, sorry for that. Will revert.

[vleschuk]

Reverted formatting changes.

[vleschuk]

Got rid of DINode::FlagAlignment. Check for forced alignment (alignas(), _Alignas(), __attribute(aligned (N))))) when creating DI* objects with DIBuilder. If alignment was not forced pass zero, otherwise pass actual alignment value. Updated related tests according to new behavior.

[dblaikie]

Like the backend patch, should/could this be broken up into separate patches for the different places/features that have alignment?

(probably just passing zero for alignment in general could be a simple cleanup patch to start, if it's otherwise unused)

lib/CodeGen/CGDebugInfo.cpp

621–622

Maybe add a comment here about why we're specifying zero alignment (or possibly change the API to not take an alignment at all so we don't have to explain it?)

(similarly for other cases where the alignment is just hardcoded to zero)

3662

is max alignment the right thing here? Should it be min alignment?
(is alignment in bits the desired thing across all of this too? It looked like in the backend patch there was some division by CHAR_BITS, etc?)

[probinson]

lib/CodeGen/CGDebugInfo.cpp

3662

I should think bits is the right choice here; seems more the province of the backend to convert it into the appropriate addressable units (commonly but not universally chars).

[rnk]

lib/CodeGen/CGDebugInfo.cpp

621

IMO this is what we should be doing everywhere, rather than manually checking AlignedAttr:

TypeInfo TI = CGM.getContext().getTypeInfo(Ty);
uint64_t Size = TI.Width;
uint64_t Align = TI.AlignIsRequired ? TI.Align : 0;

This saves a hash lookup, and handles some corner cases. AlignIsRequired is already supposed to capture whether the alignment was changed.

[vleschuk]

lib/CodeGen/CGDebugInfo.cpp

3662

is max alignment the right thing here? Should it be min alignment?

The DWARF document says:

This constant describes the actual alignment used by the compiler (if there are multiple specified by the user, or if the user specified an alignment the compiler couldn't satisfy, then only the strictest alignment will be added through a DW_AT_alignment).

So I think max alignment is right choice here.

[vleschuk]

lib/CodeGen/CGDebugInfo.cpp

621

Will check if this works in all cases. I think it's worth putting this snippet into helper function within anon namespace.

[vleschuk]

• Move alignment detection into helper functions in anon namespace
• Use updated LLVM DIBuilder API (from https://reviews.llvm.org/D24425)

[vleschuk]

lib/CodeGen/CGDebugInfo.cpp

621

That is correct for types, for particular decls we still need to use hasAttr<>. Moved both cases into separate functions.

621–622

Default arguments now are zeros.

[rnk]

lib/CodeGen/CGDebugInfo.cpp

47

LLVM prefers static to anonymous namespaces http://llvm.org/docs/CodingStandards.html#anonymous-namespaces

48

Instead of templating, have a const Type* overload and a QualType overload like getTypeInfo does:

/// \brief Get the size and alignment of the specified complete type in bits.
TypeInfo getTypeInfo(const Type *T) const;
TypeInfo getTypeInfo(QualType T) const { return getTypeInfo(T.getTypePtr()); }

49

LLVM style uses a leading lower case for method names: http://llvm.org/docs/CodingStandards.html#name-types-functions-variables-and-enumerators-properly

53

Please add a blank line between top level decls

[vleschuk]

Fix code style:

• Two overloaded methods instead of 1 template
• lower-case-headed method names
• static methods instead of anon namespace
• extra new line between methods

[rnk]

lgtm

lib/CodeGen/CGDebugInfo.cpp

54–56

Don't duplicate, just delegate to the Type * overload:

return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);

[vleschuk]

Pass alignment in bits instead of bytes to backend (conversion is done when emitting DW_AT_alignment).

[vleschuk]

Use DIAlignment type instead of uint64_t for alignment in DebugInfo.

lib/CodeGen/CGDebugInfo.h

#include "clang/Basic/OpenCLImageTypes.def"
   /// A helper function to collect debug info for template
   /// parameters.
   llvm::DINodeArray
   CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
                            llvm::DIFile *F);
 
   llvm::DIType *createFieldType(StringRef name, QualType type,
                                 SourceLocation loc, AccessSpecifier AS,
+                                uint64_t offsetInBits,
+                                llvm::DIAlignment AlignInBits,
+                                llvm::DIFile *tunit, llvm::DIScope *scope,
+                                const RecordDecl *RD = nullptr);
+
+  llvm::DIType *createFieldType(StringRef name, QualType type,
+                                SourceLocation loc, AccessSpecifier AS,
                                 uint64_t offsetInBits, llvm::DIFile *tunit,
                                 llvm::DIScope *scope,
-                                const RecordDecl *RD = nullptr);
+                                const RecordDecl *RD = nullptr) {
+    return createFieldType(name, type, loc, AS, offsetInBits, 0, tunit, scope,
+                           RD);
+  }
 
   /// Create new bit field member.
   llvm::DIType *createBitFieldType(const FieldDecl *BitFieldDecl,
                                    llvm::DIScope *RecordTy,
                                    const RecordDecl *RD);
 
   /// Helpers for collecting fields of a record.
   /// @{

lib/CodeGen/CGDebugInfo.cpp

 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/Module.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 using namespace clang;
 using namespace clang::CodeGen;
 
+static llvm::DIAlignment getTypeAlignIfRequired(const Type *Ty, const ASTContext &Ctx) {
+  auto TI = Ctx.getTypeInfo(Ty);
+  return TI.AlignIsRequired ? TI.Align : 0;
+}
+
+static llvm::DIAlignment getTypeAlignIfRequired(QualType Ty, const ASTContext &Ctx) {
+  return getTypeAlignIfRequired(Ty.getTypePtr(), Ctx);
+}
+
+static llvm::DIAlignment getDeclAlignIfRequired(const Decl *D, const ASTContext &Ctx) {
+  return D->hasAttr<AlignedAttr>() ? D->getMaxAlignment() : 0;
+}
+
 CGDebugInfo::CGDebugInfo(CodeGenModule &CGM)
     : CGM(CGM), DebugKind(CGM.getCodeGenOpts().getDebugInfo()),
       DebugTypeExtRefs(CGM.getCodeGenOpts().DebugTypeExtRefs),
       DBuilder(CGM.getModule()) {
   for (const auto &KV : CGM.getCodeGenOpts().DebugPrefixMap)
     DebugPrefixMap[KV.first] = KV.second;
   CreateCompileUnit();
 }
case BuiltinType::ULong:
     break;
   case BuiltinType::ULongLong:
     BTName = "long long unsigned int";
     break;
   default:
     BTName = BT->getName(CGM.getLangOpts());
     break;
   }
-  // Bit size, align and offset of the type.
+  // Bit size and offset of the type.
   uint64_t Size = CGM.getContext().getTypeSize(BT);
-  llvm::DIAlignment Align = CGM.getContext().getTypeAlign(BT);
-  return DBuilder.createBasicType(BTName, Size, Align, Encoding);
+  return DBuilder.createBasicType(BTName, Size, Encoding);
 }
 
 llvm::DIType *CGDebugInfo::CreateType(const ComplexType *Ty) {
-  // Bit size, align and offset of the type.
+  // Bit size and offset of the type.
   llvm::dwarf::TypeKind Encoding = llvm::dwarf::DW_ATE_complex_float;
   if (Ty->isComplexIntegerType())
     Encoding = llvm::dwarf::DW_ATE_lo_user;
 
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  llvm::DIAlignment Align = CGM.getContext().getTypeAlign(Ty);
-  return DBuilder.createBasicType("complex", Size, Align, Encoding);
+  return DBuilder.createBasicType("complex", Size, Encoding);
 }
 
 llvm::DIType *CGDebugInfo::CreateQualifiedType(QualType Ty,
                                                llvm::DIFile *Unit) {
   QualifierCollector Qc;
   const Type *T = Qc.strip(Ty);
 
   // Ignore these qualifiers for now.
CGDebugInfo::getOrCreateRecordFwdDecl(const RecordType *Ty,
   StringRef RDName = getClassName(RD);
 
   uint64_t Size = 0;
   llvm::DIAlignment Align = 0;
 
   const RecordDecl *D = RD->getDefinition();
   if (D && D->isCompleteDefinition()) {
     Size = CGM.getContext().getTypeSize(Ty);
-    Align = CGM.getContext().getTypeAlign(Ty);
+    Align = getDeclAlignIfRequired(D, CGM.getContext());
   }
 
   // Create the type.
   SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
   llvm::DICompositeType *RetTy = DBuilder.createReplaceableCompositeType(
       getTagForRecord(RD), RDName, Ctx, DefUnit, Line, 0, Size, Align,
       llvm::DINode::FlagFwdDecl, FullName);
   ReplaceMap.emplace_back(
       std::piecewise_construct, std::make_tuple(Ty),
       std::make_tuple(static_cast<llvm::Metadata *>(RetTy)));
   return RetTy;
 }
 
 llvm::DIType *CGDebugInfo::CreatePointerLikeType(llvm::dwarf::Tag Tag,
                                                  const Type *Ty,
                                                  QualType PointeeTy,
                                                  llvm::DIFile *Unit) {
   // Bit size, align and offset of the type.
   // Size is always the size of a pointer. We can't use getTypeSize here
   // because that does not return the correct value for references.
   unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
   uint64_t Size = CGM.getTarget().getPointerWidth(AS);
-  llvm::DIAlignment Align = CGM.getContext().getTypeAlign(Ty);
+  auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
 
   if (Tag == llvm::dwarf::DW_TAG_reference_type ||
       Tag == llvm::dwarf::DW_TAG_rvalue_reference_type)
     return DBuilder.createReferenceType(Tag, getOrCreateType(PointeeTy, Unit),
                                         Size, Align);
   else
     return DBuilder.createPointerType(getOrCreateType(PointeeTy, Unit), Size,
                                       Align);
llvm::DIType *CGDebugInfo::createBitFieldType(const FieldDecl *BitFieldDecl,
   // Get the location for the field.
   llvm::DIFile *File = getOrCreateFile(Loc);
   unsigned Line = getLineNumber(Loc);
 
   const CGBitFieldInfo &BitFieldInfo =
       CGM.getTypes().getCGRecordLayout(RD).getBitFieldInfo(BitFieldDecl);
   uint64_t SizeInBits = BitFieldInfo.Size;
   assert(SizeInBits > 0 && "found named 0-width bitfield");
-  unsigned AlignInBits = CGM.getContext().getTypeAlign(Ty);
   uint64_t StorageOffsetInBits =
       CGM.getContext().toBits(BitFieldInfo.StorageOffset);
   uint64_t OffsetInBits = StorageOffsetInBits + BitFieldInfo.Offset;
   llvm::DINode::DIFlags Flags = getAccessFlag(BitFieldDecl->getAccess(), RD);
   return DBuilder.createBitFieldMemberType(
-      RecordTy, Name, File, Line, SizeInBits, AlignInBits, OffsetInBits,
-      StorageOffsetInBits, Flags, DebugType);
+      RecordTy, Name, File, Line, SizeInBits, OffsetInBits, StorageOffsetInBits,
+      Flags, DebugType);
 }
 
 llvm::DIType *
 CGDebugInfo::createFieldType(StringRef name, QualType type, SourceLocation loc,
                              AccessSpecifier AS, uint64_t offsetInBits,
-                             llvm::DIFile *tunit, llvm::DIScope *scope,
-                             const RecordDecl *RD) {
+                             llvm::DIAlignment AlignInBits, llvm::DIFile *tunit,
+                             llvm::DIScope *scope, const RecordDecl *RD) {
   llvm::DIType *debugType = getOrCreateType(type, tunit);
 
   // Get the location for the field.
   llvm::DIFile *file = getOrCreateFile(loc);
   unsigned line = getLineNumber(loc);
 
   uint64_t SizeInBits = 0;
-  unsigned AlignInBits = 0;
+  auto Align = AlignInBits;
   if (!type->isIncompleteArrayType()) {
     TypeInfo TI = CGM.getContext().getTypeInfo(type);
     SizeInBits = TI.Width;
-    AlignInBits = TI.Align;
+    if (!Align)
+      Align = getTypeAlignIfRequired(type, CGM.getContext());
   }
 
   llvm::DINode::DIFlags flags = getAccessFlag(AS, RD);
   return DBuilder.createMemberType(scope, name, file, line, SizeInBits,
-                                   AlignInBits, offsetInBits, flags, debugType);
+                                   Align, offsetInBits, flags, debugType);
 }
 
 void CGDebugInfo::CollectRecordLambdaFields(
     const CXXRecordDecl *CXXDecl, SmallVectorImpl<llvm::Metadata *> &elements,
     llvm::DIType *RecordTy) {
   // For C++11 Lambdas a Field will be the same as a Capture, but the Capture
   // has the name and the location of the variable so we should iterate over
   // both concurrently.
   const ASTRecordLayout &layout = CGM.getContext().getASTRecordLayout(CXXDecl);
   RecordDecl::field_iterator Field = CXXDecl->field_begin();
   unsigned fieldno = 0;
   for (CXXRecordDecl::capture_const_iterator I = CXXDecl->captures_begin(),
                                              E = CXXDecl->captures_end();
        I != E; ++I, ++Field, ++fieldno) {
     const LambdaCapture &C = *I;
     if (C.capturesVariable()) {
       SourceLocation Loc = C.getLocation();
       assert(!Field->isBitField() && "lambdas don't have bitfield members!");
       VarDecl *V = C.getCapturedVar();
       StringRef VName = V->getName();
       llvm::DIFile *VUnit = getOrCreateFile(Loc);
+      auto Align = getDeclAlignIfRequired(V, CGM.getContext());
       llvm::DIType *FieldType = createFieldType(
           VName, Field->getType(), Loc, Field->getAccess(),
-          layout.getFieldOffset(fieldno), VUnit, RecordTy, CXXDecl);
+          layout.getFieldOffset(fieldno), Align, VUnit, RecordTy, CXXDecl);
       elements.push_back(FieldType);
     } else if (C.capturesThis()) {
       // TODO: Need to handle 'this' in some way by probably renaming the
       // this of the lambda class and having a field member of 'this' or
       // by using AT_object_pointer for the function and having that be
       // used as 'this' for semantic references.
       FieldDecl *f = *Field;
       llvm::DIFile *VUnit = getOrCreateFile(f->getLocation());
if (Value) {
       if (Value->isInt())
         C = llvm::ConstantInt::get(CGM.getLLVMContext(), Value->getInt());
       if (Value->isFloat())
         C = llvm::ConstantFP::get(CGM.getLLVMContext(), Value->getFloat());
     }
   }
 
   llvm::DINode::DIFlags Flags = getAccessFlag(Var->getAccess(), RD);
+  auto Align = getDeclAlignIfRequired(Var, CGM.getContext());
   llvm::DIDerivedType *GV = DBuilder.createStaticMemberType(
-      RecordTy, VName, VUnit, LineNumber, VTy, Flags, C);
+      RecordTy, VName, VUnit, LineNumber, VTy, Flags, C, Align);
   StaticDataMemberCache[Var->getCanonicalDecl()].reset(GV);
   return GV;
 }
 
 void CGDebugInfo::CollectRecordNormalField(
     const FieldDecl *field, uint64_t OffsetInBits, llvm::DIFile *tunit,
     SmallVectorImpl<llvm::Metadata *> &elements, llvm::DIType *RecordTy,
     const RecordDecl *RD) {
   StringRef name = field->getName();
   QualType type = field->getType();
 
   // Ignore unnamed fields unless they're anonymous structs/unions.
   if (name.empty() && !type->isRecordType())
     return;
 
   llvm::DIType *FieldType;
   if (field->isBitField()) {
     FieldType = createBitFieldType(field, RecordTy, RD);
   } else {
+    auto Align = getDeclAlignIfRequired(field, CGM.getContext());
     FieldType =
         createFieldType(name, type, field->getLocation(), field->getAccess(),
-                        OffsetInBits, tunit, RecordTy, RD);
+                        OffsetInBits, Align, tunit, RecordTy, RD);
   }
 
   elements.push_back(FieldType);
 }
 
 void CGDebugInfo::CollectRecordNestedRecord(
     const RecordDecl *RD, SmallVectorImpl<llvm::Metadata *> &elements) {
   QualType Ty = CGM.getContext().getTypeDeclType(RD);
llvm::DISubroutineType *CGDebugInfo::getOrCreateInstanceMethodType(
   // "this" pointer is always first argument.
   const CXXRecordDecl *RD = ThisPtr->getPointeeCXXRecordDecl();
   if (isa<ClassTemplateSpecializationDecl>(RD)) {
     // Create pointer type directly in this case.
     const PointerType *ThisPtrTy = cast<PointerType>(ThisPtr);
     QualType PointeeTy = ThisPtrTy->getPointeeType();
     unsigned AS = CGM.getContext().getTargetAddressSpace(PointeeTy);
     uint64_t Size = CGM.getTarget().getPointerWidth(AS);
-    llvm::DIAlignment Align = CGM.getContext().getTypeAlign(ThisPtrTy);
+    auto Align = getTypeAlignIfRequired(ThisPtrTy, CGM.getContext());
     llvm::DIType *PointeeType = getOrCreateType(PointeeTy, Unit);
     llvm::DIType *ThisPtrType =
         DBuilder.createPointerType(PointeeType, Size, Align);
     TypeCache[ThisPtr.getAsOpaquePtr()].reset(ThisPtrType);
     // TODO: This and the artificial type below are misleading, the
     // types aren't artificial the argument is, but the current
     // metadata doesn't represent that.
     ThisPtrType = DBuilder.createObjectPointerType(ThisPtrType);
llvm::DIType *CGDebugInfo::CreateTypeDefinition(const ObjCInterfaceType *Ty,
                                                 llvm::DIFile *Unit) {
   ObjCInterfaceDecl *ID = Ty->getDecl();
   llvm::DIFile *DefUnit = getOrCreateFile(ID->getLocation());
   unsigned Line = getLineNumber(ID->getLocation());
   unsigned RuntimeLang = TheCU->getSourceLanguage();
 
   // Bit size, align and offset of the type.
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  llvm::DIAlignment Align = CGM.getContext().getTypeAlign(Ty);
+  auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
 
   llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
   if (ID->getImplementation())
     Flags |= llvm::DINode::FlagObjcClassComplete;
- 
   llvm::DIScope *Mod = getParentModuleOrNull(ID);
   llvm::DICompositeType *RealDecl = DBuilder.createStructType(
       Mod ? Mod : Unit, ID->getName(), DefUnit, Line, Size, Align, Flags,
       nullptr, llvm::DINodeArray(), RuntimeLang);
 
   QualType QTy(Ty, 0);
   TypeCache[QTy.getAsOpaquePtr()].reset(RealDecl);
 
for (ObjCIvarDecl *Field = ID->all_declared_ivar_begin(); Field;
     if (FieldName.empty())
       continue;
 
     // Get the location for the field.
     llvm::DIFile *FieldDefUnit = getOrCreateFile(Field->getLocation());
     unsigned FieldLine = getLineNumber(Field->getLocation());
     QualType FType = Field->getType();
     uint64_t FieldSize = 0;
-    unsigned FieldAlign = 0;
+    llvm::DIAlignment FieldAlign = 0;
 
     if (!FType->isIncompleteArrayType()) {
 
       // Bit size, align and offset of the type.
       FieldSize = Field->isBitField()
                       ? Field->getBitWidthValue(CGM.getContext())
                       : CGM.getContext().getTypeSize(FType);
-      FieldAlign = CGM.getContext().getTypeAlign(FType);
+      FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
     }
 
     uint64_t FieldOffset;
     if (CGM.getLangOpts().ObjCRuntime.isNonFragile()) {
       // We don't know the runtime offset of an ivar if we're using the
       // non-fragile ABI.  For bitfields, use the bit offset into the first
       // byte of storage of the bitfield.  For other fields, use zero.
       if (Field->isBitField()) {
if (Count == 0)
     // If number of elements are not known then this is an unbounded array.
     // Use Count == -1 to express such arrays.
     Count = -1;
 
   llvm::Metadata *Subscript = DBuilder.getOrCreateSubrange(0, Count);
   llvm::DINodeArray SubscriptArray = DBuilder.getOrCreateArray(Subscript);
 
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  llvm::DIAlignment Align = CGM.getContext().getTypeAlign(Ty);
+  auto Align = getTypeAlignIfRequired(Ty, CGM.getContext());
 
   return DBuilder.createVectorType(Size, Align, ElementTy, SubscriptArray);
 }
 
 llvm::DIType *CGDebugInfo::CreateType(const ArrayType *Ty, llvm::DIFile *Unit) {
   uint64_t Size;
   llvm::DIAlignment Align;
 
   // FIXME: make getTypeAlign() aware of VLAs and incomplete array types
   if (const auto *VAT = dyn_cast<VariableArrayType>(Ty)) {
     Size = 0;
-    Align =
-        CGM.getContext().getTypeAlign(CGM.getContext().getBaseElementType(VAT));
+    Align = getTypeAlignIfRequired(CGM.getContext().getBaseElementType(VAT),
+                                   CGM.getContext());
   } else if (Ty->isIncompleteArrayType()) {
     Size = 0;
     if (Ty->getElementType()->isIncompleteType())
       Align = 0;
     else
-      Align = CGM.getContext().getTypeAlign(Ty->getElementType());
+      Align = getTypeAlignIfRequired(Ty->getElementType(), CGM.getContext());
   } else if (Ty->isIncompleteType()) {
     Size = 0;
     Align = 0;
   } else {
     // Size and align of the whole array, not the element type.
     Size = CGM.getContext().getTypeSize(Ty);
-    Align = CGM.getContext().getTypeAlign(Ty);
+    Align = getTypeAlignIfRequired(Ty, CGM.getContext());
   }
 
   // Add the dimensions of the array.  FIXME: This loses CV qualifiers from
   // interior arrays, do we care?  Why aren't nested arrays represented the
   // obvious/recursive way?
   SmallVector<llvm::Metadata *, 8> Subscripts;
   QualType EltTy(Ty, 0);
   while ((Ty = dyn_cast<ArrayType>(EltTy))) {

 
 llvm::DIType *CGDebugInfo::CreateEnumType(const EnumType *Ty) {
   const EnumDecl *ED = Ty->getDecl();
 
   uint64_t Size = 0;
   llvm::DIAlignment Align = 0;
   if (!ED->getTypeForDecl()->isIncompleteType()) {
     Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
-    Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
+    Align = getDeclAlignIfRequired(ED, CGM.getContext());
   }
 
   SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
 
   bool isImportedFromModule =
       DebugTypeExtRefs && ED->isFromASTFile() && ED->getDefinition();
 
   // If this is just a forward declaration, construct an appropriately

 }
 
 llvm::DIType *CGDebugInfo::CreateTypeDefinition(const EnumType *Ty) {
   const EnumDecl *ED = Ty->getDecl();
   uint64_t Size = 0;
   llvm::DIAlignment Align = 0;
   if (!ED->getTypeForDecl()->isIncompleteType()) {
     Size = CGM.getContext().getTypeSize(ED->getTypeForDecl());
-    Align = CGM.getContext().getTypeAlign(ED->getTypeForDecl());
+    Align = getDeclAlignIfRequired(ED, CGM.getContext());
   }
 
   SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
 
   // Create elements for each enumerator.
   SmallVector<llvm::Metadata *, 16> Enumerators;
   ED = ED->getDefinition();
   for (const auto *Enum : ED->enumerators()) {
llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
 
   // If this is just a forward or incomplete declaration, construct an
   // appropriately marked node and just return it.
   const RecordDecl *D = RD->getDefinition();
   if (!D || !D->isCompleteDefinition())
     return getOrCreateRecordFwdDecl(Ty, RDContext);
 
   uint64_t Size = CGM.getContext().getTypeSize(Ty);
-  llvm::DIAlignment Align = CGM.getContext().getTypeAlign(Ty);
+  auto Align = getDeclAlignIfRequired(D, CGM.getContext());
 
   SmallString<256> FullName = getUniqueTagTypeName(Ty, CGM, TheCU);
 
   llvm::DICompositeType *RealDecl = DBuilder.createReplaceableCompositeType(
       getTagForRecord(RD), RDName, RDContext, DefUnit, Line, 0, Size, Align,
       llvm::DINode::FlagZero, FullName);
 
   // Elements of composite types usually have back to the type, creating
void CGDebugInfo::CollectContainingType(const CXXRecordDecl *RD,
 
   DBuilder.replaceVTableHolder(RealDecl, ContainingType);
 }
 
 llvm::DIType *CGDebugInfo::CreateMemberType(llvm::DIFile *Unit, QualType FType,
                                             StringRef Name, uint64_t *Offset) {
   llvm::DIType *FieldTy = CGDebugInfo::getOrCreateType(FType, Unit);
   uint64_t FieldSize = CGM.getContext().getTypeSize(FType);
-  unsigned FieldAlign = CGM.getContext().getTypeAlign(FType);
+  auto FieldAlign = getTypeAlignIfRequired(FType, CGM.getContext());
   llvm::DIType *Ty =
       DBuilder.createMemberType(Unit, Name, Unit, 0, FieldSize, FieldAlign,
                                 *Offset, llvm::DINode::FlagZero, FieldTy);
   *Offset += FieldSize;
   return Ty;
 }
 
 void CGDebugInfo::collectFunctionDeclProps(GlobalDecl GD, llvm::DIFile *Unit,
CGDebugInfo::getGlobalVariableForwardDeclaration(const VarDecl *VD) {
   QualType T;
   StringRef Name, LinkageName;
   SourceLocation Loc = VD->getLocation();
   llvm::DIFile *Unit = getOrCreateFile(Loc);
   llvm::DIScope *DContext = Unit;
   unsigned Line = getLineNumber(Loc);
 
   collectVarDeclProps(VD, Unit, Line, T, Name, LinkageName, DContext);
+  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
   auto *GV = DBuilder.createTempGlobalVariableFwdDecl(
       DContext, Name, LinkageName, Unit, Line, getOrCreateType(T, Unit),
-      !VD->isExternallyVisible(), nullptr, nullptr);
+      !VD->isExternallyVisible(), nullptr, nullptr, Align);
   FwdDeclReplaceMap.emplace_back(
       std::piecewise_construct,
       std::make_tuple(cast<VarDecl>(VD->getCanonicalDecl())),
       std::make_tuple(static_cast<llvm::Metadata *>(GV)));
   return GV;
 }
 
 llvm::DINode *CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {

 }
 
 llvm::DIType *CGDebugInfo::EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
                                                         uint64_t *XOffset) {
 
   SmallVector<llvm::Metadata *, 5> EltTys;
   QualType FType;
   uint64_t FieldSize, FieldOffset;
-  unsigned FieldAlign;
+  llvm::DIAlignment FieldAlign;
 
   llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
   QualType Type = VD->getType();
 
   FieldOffset = 0;
   FType = CGM.getContext().getPointerType(CGM.getContext().VoidTy);
   EltTys.push_back(CreateMemberType(Unit, FType, "__isa", &FieldOffset));
   EltTys.push_back(CreateMemberType(Unit, FType, "__forwarding", &FieldOffset));
void CGDebugInfo::EmitDeclare(const VarDecl *VD, llvm::Value *Storage,
   if (!Unwritten) {
     Line = getLineNumber(VD->getLocation());
     Column = getColumnNumber(VD->getLocation());
   }
   SmallVector<int64_t, 9> Expr;
   llvm::DINode::DIFlags Flags = llvm::DINode::FlagZero;
   if (VD->isImplicit())
     Flags |= llvm::DINode::FlagArtificial;
+
+  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
+
   // If this is the first argument and it is implicit then
   // give it an object pointer flag.
   // FIXME: There has to be a better way to do this, but for static
   // functions there won't be an implicit param at arg1 and
   // otherwise it is 'self' or 'this'.
   if (isa<ImplicitParamDecl>(VD) && ArgNo && *ArgNo == 1)
     Flags |= llvm::DINode::FlagObjectPointer;
   if (auto *Arg = dyn_cast<llvm::Argument>(Storage))
if (VD->hasAttr<BlocksAttr>()) {
       offset = CGM.getContext().toCharUnitsFromBits(XOffset);
       Expr.push_back(offset.getQuantity());
 
       // Create the descriptor for the variable.
       auto *D = ArgNo
                     ? DBuilder.createParameterVariable(Scope, VD->getName(),
                                                        *ArgNo, Unit, Line, Ty)
                     : DBuilder.createAutoVariable(Scope, VD->getName(), Unit,
-                                                  Line, Ty);
+                                                  Line, Ty, Align);
 
       // Insert an llvm.dbg.declare into the current block.
       DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
                              llvm::DebugLoc::get(Line, Column, Scope),
                              Builder.GetInsertBlock());
       return;
     } else if (isa<VariableArrayType>(VD->getType()))
       Expr.push_back(llvm::dwarf::DW_OP_deref);
if (RD->isUnion() && RD->isAnonymousStructOrUnion()) {
         llvm::DIType *FieldTy = getOrCreateType(Field->getType(), Unit);
         StringRef FieldName = Field->getName();
 
         // Ignore unnamed fields. Do not ignore unnamed records.
         if (FieldName.empty() && !isa<RecordType>(Field->getType()))
           continue;
 
         // Use VarDecl's Tag, Scope and Line number.
+        auto FieldAlign = getDeclAlignIfRequired(Field, CGM.getContext());
         auto *D = DBuilder.createAutoVariable(
             Scope, FieldName, Unit, Line, FieldTy, CGM.getLangOpts().Optimize,
-            Flags | llvm::DINode::FlagArtificial);
+            Flags | llvm::DINode::FlagArtificial, FieldAlign);
 
         // Insert an llvm.dbg.declare into the current block.
         DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
                                llvm::DebugLoc::get(Line, Column, Scope),
                                Builder.GetInsertBlock());
       }
     }
   }
 
   // Create the descriptor for the variable.
-  auto *D =
-      ArgNo
-          ? DBuilder.createParameterVariable(Scope, Name, *ArgNo, Unit, Line,
-                                             Ty, CGM.getLangOpts().Optimize,
-                                             Flags)
+  auto *D = ArgNo
+                ? DBuilder.createParameterVariable(
+                      Scope, Name, *ArgNo, Unit, Line, Ty,
+                      CGM.getLangOpts().Optimize, Flags)
                 : DBuilder.createAutoVariable(Scope, Name, Unit, Line, Ty,
-                                        CGM.getLangOpts().Optimize, Flags);
+                                              CGM.getLangOpts().Optimize, Flags,
+                                              Align);
 
   // Insert an llvm.dbg.declare into the current block.
   DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(Expr),
                          llvm::DebugLoc::get(Line, Column, Scope),
                          Builder.GetInsertBlock());
 }
 
 void CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD,
if (isByRef) {
     addr.push_back(llvm::dwarf::DW_OP_deref);
     addr.push_back(llvm::dwarf::DW_OP_plus);
     // offset of x field
     offset = CGM.getContext().toCharUnitsFromBits(XOffset);
     addr.push_back(offset.getQuantity());
   }
 
   // Create the descriptor for the variable.
+  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
   auto *D = DBuilder.createAutoVariable(
       cast<llvm::DILocalScope>(LexicalBlockStack.back()), VD->getName(), Unit,
-      Line, Ty);
+      Line, Ty, false, llvm::DINode::FlagZero, Align);
 
   // Insert an llvm.dbg.declare into the current block.
   auto DL = llvm::DebugLoc::get(Line, Column, LexicalBlockStack.back());
   if (InsertPoint)
     DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr), DL,
                            InsertPoint);
   else
     DBuilder.insertDeclare(Storage, D, DBuilder.createExpression(addr), DL,
for (const BlockLayoutChunk &Chunk : chunks) {
     }
 
     const VarDecl *variable = capture->getVariable();
     StringRef name = variable->getName();
 
     llvm::DIType *fieldType;
     if (capture->isByRef()) {
       TypeInfo PtrInfo = C.getTypeInfo(C.VoidPtrTy);
+      auto Align = PtrInfo.AlignIsRequired ? PtrInfo.Align : 0;
 
       // FIXME: this creates a second copy of this type!
       uint64_t xoffset;
       fieldType = EmitTypeForVarWithBlocksAttr(variable, &xoffset);
       fieldType = DBuilder.createPointerType(fieldType, PtrInfo.Width);
-      fieldType = DBuilder.createMemberType(
-          tunit, name, tunit, line, PtrInfo.Width, PtrInfo.Align, offsetInBits,
+      fieldType = DBuilder.createMemberType(tunit, name, tunit, line,
+                                            PtrInfo.Width, Align, offsetInBits,
                                             llvm::DINode::FlagZero, fieldType);
     } else {
+      auto Align = getDeclAlignIfRequired(variable, CGM.getContext());
       fieldType = createFieldType(name, variable->getType(), loc, AS_public,
-                                  offsetInBits, tunit, tunit);
+                                  offsetInBits, Align, tunit, tunit);
     }
     fields.push_back(fieldType);
   }
 
   SmallString<36> typeName;
   llvm::raw_svector_ostream(typeName) << "__block_literal_"
                                       << CGM.getUniqueBlockCount();
 
   llvm::DINodeArray fieldsArray = DBuilder.getOrCreateArray(fields);
 
   llvm::DIType *type =
       DBuilder.createStructType(tunit, typeName.str(), tunit, line,
-                                CGM.getContext().toBits(block.BlockSize),
-                                CGM.getContext().toBits(block.BlockAlign),
+                                CGM.getContext().toBits(block.BlockSize), 0,
                                 llvm::DINode::FlagZero, nullptr, fieldsArray);
   type = DBuilder.createPointerType(type, CGM.PointerWidthInBits);
 
   // Get overall information about the block.
   llvm::DINode::DIFlags flags = llvm::DINode::FlagArtificial;
   auto *scope = cast<llvm::DILocalScope>(LexicalBlockStack.back());
 
   // Create the descriptor for the parameter.
if (D->hasAttr<NoDebugAttr>())
     return;
   // Create global variable debug descriptor.
   llvm::DIFile *Unit = nullptr;
   llvm::DIScope *DContext = nullptr;
   unsigned LineNo;
   StringRef DeclName, LinkageName;
   QualType T;
   collectVarDeclProps(D, Unit, LineNo, T, DeclName, LinkageName, DContext);
 
   // Attempt to store one global variable for the declaration - even if we
   // emit a lot of fields.
   llvm::DIGlobalVariable *GV = nullptr;
 
   // If this is an anonymous union then we'll want to emit a global
   // variable for each member of the anonymous union so that it's possible
   // to find the name of any field in the union.
   if (T->isUnionType() && DeclName.empty()) {
     const RecordDecl *RD = T->castAs<RecordType>()->getDecl();
     assert(RD->isAnonymousStructOrUnion() &&
            "unnamed non-anonymous struct or union?");
     GV = CollectAnonRecordDecls(RD, Unit, LineNo, LinkageName, Var, DContext);
   } else {
+    auto Align = getDeclAlignIfRequired(D, CGM.getContext());
     GV = DBuilder.createGlobalVariable(
         DContext, DeclName, LinkageName, Unit, LineNo, getOrCreateType(T, Unit),
         Var->hasLocalLinkage(), /*Expr=*/nullptr,
-        getOrCreateStaticDataMemberDeclarationOrNull(D));
+        getOrCreateStaticDataMemberDeclarationOrNull(D), Align);
     Var->addDebugInfo(GV);
   }
   DeclCache[D->getCanonicalDecl()].reset(GV);
 }
 
 void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
   assert(DebugKind >= codegenoptions::LimitedDebugInfo);
   if (VD->hasAttr<NoDebugAttr>())
     return;
+  auto Align = getDeclAlignIfRequired(VD, CGM.getContext());
   // Create the descriptor for the variable.
   llvm::DIFile *Unit = getOrCreateFile(VD->getLocation());
   StringRef Name = VD->getName();
   llvm::DIType *Ty = getOrCreateType(VD->getType(), Unit);
   if (const auto *ECD = dyn_cast<EnumConstantDecl>(VD)) {
     const auto *ED = cast<EnumDecl>(ECD->getDeclContext());
     assert(isa<EnumType>(ED->getTypeForDecl()) && "Enum without EnumType?");
     Ty = getOrCreateType(QualType(ED->getTypeForDecl(), 0), Unit);
void CGDebugInfo::EmitGlobalVariable(const ValueDecl *VD, const APValue &Init) {
   if (GV)
     return;
   llvm::DIExpression *InitExpr = nullptr;
   if (Init.isInt())
     InitExpr =
         DBuilder.createConstantValueExpression(Init.getInt().getExtValue());
   GV.reset(DBuilder.createGlobalVariable(
       DContext, Name, StringRef(), Unit, getLineNumber(VD->getLocation()), Ty,
-      true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD)));
+      true, InitExpr, getOrCreateStaticDataMemberDeclarationOrNull(VarD),
+      Align));
 }
 
 llvm::DIScope *CGDebugInfo::getCurrentContextDescriptor(const Decl *D) {
   if (!LexicalBlockStack.empty())
     return LexicalBlockStack.back();
   llvm::DIScope *Mod = getParentModuleOrNull(D);
   return getContextDescriptor(D, Mod ? Mod : TheCU);
 }

test/CodeGen/debug-info-packed-struct.c

 };
 struct layout0 {
   char l0_ofs0;
   struct size8 l0_ofs8;
   int l0_ofs16 : 1;
 };
 // CHECK: l0_ofs0
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l0_ofs8",
-// CHECK-SAME:     {{.*}}size: 64, align: 64, offset: 64)
+// CHECK-SAME:     {{.*}}size: 64, offset: 64)
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l0_ofs16",
-// CHECK-SAME:     {{.*}}size: 1, align: 32, offset: 128, flags: DIFlagBitField, extraData: i64 128)
+// CHECK-SAME:     {{.*}}size: 1, offset: 128, flags: DIFlagBitField, extraData: i64 128)
 
 
 // ---------------------------------------------------------------------
 // Implicitly packed.
 // ---------------------------------------------------------------------
 struct size8_anon {
   int : 4;
   long long : 60;
 };
 struct layout1 {
   char l1_ofs0;
   struct size8_anon l1_ofs1;
   int l1_ofs9 : 1;
 };
 // CHECK: l1_ofs0
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l1_ofs1",
-// CHECK-SAME:     {{.*}}size: 64, align: 8, offset: 8)
+// CHECK-SAME:     {{.*}}size: 64, offset: 8)
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l1_ofs9",
-// CHECK-SAME:     {{.*}}size: 1, align: 32, offset: 72, flags: DIFlagBitField, extraData: i64 72)
+// CHECK-SAME:     {{.*}}size: 1, offset: 72, flags: DIFlagBitField, extraData: i64 72)
 
 
 // ---------------------------------------------------------------------
 // Explicitly packed.
 // ---------------------------------------------------------------------
 #pragma pack(1)
 struct size8_pack1 {
   int i : 4;
   long long l : 60;
 };
 struct layout2 {
   char l2_ofs0;
   struct size8_pack1 l2_ofs1;
   int l2_ofs9 : 1;
 };
 #pragma pack()
 // CHECK: l2_ofs0
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l2_ofs1",
-// CHECK-SAME:     {{.*}}size: 64, align: 8, offset: 8)
+// CHECK-SAME:     {{.*}}size: 64, offset: 8)
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l2_ofs9",
-// CHECK-SAME:     {{.*}}size: 1, align: 32, offset: 72, flags: DIFlagBitField, extraData: i64 72)
+// CHECK-SAME:     {{.*}}size: 1, offset: 72, flags: DIFlagBitField, extraData: i64 72)
 
 
 
 // ---------------------------------------------------------------------
 // Explicitly packed with different alignment.
 // ---------------------------------------------------------------------
 #pragma pack(4)
 struct size8_pack4 {
   int i : 4;
   long long l : 60;
 };
 struct layout3 {
   char l3_ofs0;
   struct size8_pack4 l3_ofs4;
   int l3_ofs12 : 1;
 };
 #pragma pack()
 // CHECK: l3_ofs0
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l3_ofs4",
-// CHECK-SAME:     {{.*}}size: 64, align: 32, offset: 32)
+// CHECK-SAME:     {{.*}}size: 64, offset: 32)
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "l3_ofs12",
-// CHECK-SAME:     {{.*}}size: 1, align: 32, offset: 96, flags: DIFlagBitField, extraData: i64 96)
+// CHECK-SAME:     {{.*}}size: 1, offset: 96, flags: DIFlagBitField, extraData: i64 96)
 
 struct layout3 l3;
 struct layout0 l0;
 struct layout1 l1;
 struct layout2 l2;

test/CodeGen/debug-info-vector.c

 // RUN: %clang_cc1 -emit-llvm -debug-info-kind=limited %s -o - | FileCheck %s
 typedef int v4si __attribute__((__vector_size__(16)));
 
 v4si a;
 
 // Test that we get an array type that's also a vector out of debug.
 // CHECK: !DICompositeType(tag: DW_TAG_array_type,
 // CHECK-SAME:             baseType: ![[INT:[0-9]+]]
-// CHECK-SAME:             size: 128, align: 128
+// CHECK-SAME:             size: 128
 // CHECK-SAME:             DIFlagVector
 // CHECK: ![[INT]] = !DIBasicType(name: "int"

test/CodeGenCXX/debug-info-calling-conventions.cpp

 // RUN: %clang_cc1 %s -triple=i686-pc-windows-msvc -debug-info-kind=limited -emit-llvm -o - | FileCheck %s
 
 struct A {
   void thiscallcc();
 };
 void A::thiscallcc() {}
 
 // CHECK: !DISubprogram(name: "thiscallcc", {{.*}} type: ![[thiscallty:[^,]*]], {{.*}})
 // CHECK: ![[thiscallty]] = !DISubroutineType(cc: DW_CC_BORLAND_thiscall, types: ![[thisargs:[^,)]*]])
 // CHECK: ![[thisargs]] = !{null, ![[thisptrty:[^,}]*]]}
-// CHECK: ![[thisptrty]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !{{.*}}, size: 32, align: 32, flags: DIFlagArtificial | DIFlagObjectPointer)
+// CHECK: ![[thisptrty]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !{{.*}}, size: 32, flags: DIFlagArtificial | DIFlagObjectPointer)
 
 void cdeclcc() {}
 void __fastcall fastcallcc() {}
 void __stdcall stdcallcc() {}
 void __vectorcall vectorcallcc() {}
 
 // CHECK: !DISubprogram(name: "cdeclcc", {{.*}} type: ![[cdeclty:[^,]*]], {{.*}})
 // CHECK: ![[cdeclty]] = !DISubroutineType(types: ![[noargs:[^,)]*]])
 // CHECK: ![[noargs]] = !{null}
 // CHECK: !DISubprogram(name: "fastcallcc", {{.*}} type: ![[fastcallty:[^,]*]], {{.*}})
 // CHECK: ![[fastcallty]] = !DISubroutineType(cc: DW_CC_BORLAND_msfastcall, types: ![[noargs]])
 // CHECK: !DISubprogram(name: "stdcallcc", {{.*}} type: ![[stdcallty:[^,]*]], {{.*}})
 // CHECK: ![[stdcallty]] = !DISubroutineType(cc: DW_CC_BORLAND_stdcall, types: ![[noargs]])
 // CHECK: !DISubprogram(name: "vectorcallcc", {{.*}} type: ![[vectorcallty:[^,]*]], {{.*}})
 // CHECK: ![[vectorcallty]] = !DISubroutineType(cc: DW_CC_LLVM_vectorcall, types: ![[noargs]])

test/CodeGenCXX/debug-info-enum-class.cpp

 // RUN: %clang_cc1 -emit-llvm -debug-info-kind=limited -triple x86_64-apple-darwin -std=c++11 %s -o - | FileCheck %s
 
 enum class A { A1=1 };                 // underlying type is int by default
 enum class B: unsigned long { B1=1 };  // underlying type is unsigned long
 enum C { C1 = 1 };
 enum D : short; // enum forward declaration
 enum Z : int;
 A a;
 B b;
 C c;
 D d;
 
 // CHECK: !DICompositeType(tag: DW_TAG_enumeration_type, name: "A"
 // CHECK-SAME:             line: 3
 // CHECK-SAME:             baseType: ![[INT:[0-9]+]]
-// CHECK-SAME:             size: 32, align: 32
+// CHECK-SAME:             size: 32
 // CHECK-NOT:              offset:
 // CHECK-NOT:              flags:
 // CHECK-SAME:             ){{$}}
 // CHECK: ![[INT]] = !DIBasicType(name: "int"
 // CHECK: !DICompositeType(tag: DW_TAG_enumeration_type, name: "B"
 // CHECK-SAME:             line: 4
 // CHECK-SAME:             baseType: ![[ULONG:[0-9]+]]
-// CHECK-SAME:             size: 64, align: 64
+// CHECK-SAME:             size: 64
 // CHECK-NOT:              offset:
 // CHECK-NOT:              flags:
 // CHECK-SAME:             ){{$}}
 // CHECK: ![[ULONG]] = !DIBasicType(name: "long unsigned int"
 // CHECK: !DICompositeType(tag: DW_TAG_enumeration_type, name: "C"
 // CHECK-SAME:             line: 5
 // CHECK-NOT:              baseType:
-// CHECK-SAME:             size: 32, align: 32
+// CHECK-SAME:             size: 32
 // CHECK-NOT:              offset:
 // CHECK-NOT:              flags:
 // CHECK-SAME:             ){{$}}
 
 namespace PR14029 {
   // Make sure this doesn't crash/assert.
   template <typename T> struct Test {
     enum class Tag {

 }
 enum E : int { e };
 void f2(E) {
 }
 }
 
 // CHECK: !DICompositeType(tag: DW_TAG_enumeration_type, name: "D"
 // CHECK-SAME:             line: 6
-// CHECK-SAME:             size: 16, align: 16
+// CHECK-SAME:             size: 16
 // CHECK-NOT:              offset:
 // CHECK-SAME:             flags: DIFlagFwdDecl
 
 // CHECK: !DICompositeType(tag: DW_TAG_enumeration_type, name: "Z"
 // CHECK-NOT:              scope:
 // CHECK-SAME:             flags: DIFlagFwdDecl
 void fz() { Z z; }
 

test/CodeGenCXX/debug-info-indirect-field-decl.cpp

 // RUN: %clang_cc1 -emit-llvm -debug-info-kind=limited -triple x86_64-apple-darwin %s -o - | FileCheck %s
 //
 // Test that indirect field decls are handled gracefully.
 // rdar://problem/16348575
 //
 template <class T, int T::*ptr> class Foo {  };
 
 struct Bar {
   int i1;
   // CHECK: ![[INT:[0-9]+]] = !DIBasicType(name: "int"
   // CHECK: !DIDerivedType(tag: DW_TAG_member, scope:
   // CHECK-SAME:           line: [[@LINE+4]]
   // CHECK-SAME:           baseType: ![[UNION:[0-9]+]]
-  // CHECK-SAME:           size: 32, align: 32, offset: 32
+  // CHECK-SAME:           size: 32, offset: 32
   // CHECK: ![[UNION]] = distinct !DICompositeType(tag: DW_TAG_union_type,{{.*}} identifier: "_ZTSN3BarUt_E")
   union {
     // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "i2",
     // CHECK-SAME:           line: [[@LINE+5]]
     // CHECK-SAME:           baseType: ![[INT]]
-    // CHECK-SAME:           size: 32, align: 32
+    // CHECK-SAME:           size: 32
     // CHECK-NOT:            offset:
     // CHECK-SAME:           ){{$}}
     int i2;
   };
 };
 
 Foo<Bar, &Bar::i2> the_foo;

test/CodeGenCXX/debug-info-ms-bitfields.cpp

 // RUN: %clang_cc1 -triple x86_64-pc-win32 -debug-info-kind=limited -gcodeview %s -emit-llvm -o - | FileCheck %s
 
 #pragma pack(1)
 struct S {
   char : 8;
   short   : 8;
   short x : 8;
 } s;
 
-// CHECK: !DIDerivedType(tag: DW_TAG_member, name: "x", {{.*}}, size: 8, align: 16, offset: 16, flags: DIFlagBitField, extraData: i64 8)
+// CHECK: !DIDerivedType(tag: DW_TAG_member, name: "x", {{.*}}, size: 8, offset: 16, flags: DIFlagBitField, extraData: i64 8)

test/CodeGenCXX/debug-info-ms-ptr-to-member.cpp

 // CHECK: distinct !DIGlobalVariable(name: "pmf_c", {{.*}} type: ![[pmf_c:[^, ]*]], {{.*}})
 // CHECK: ![[pmf_c]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !{{.*}}, size: 128, flags: DIFlagVirtualInheritance, {{.*}})
 // CHECK: distinct !DIGlobalVariable(name: "pmf_d", {{.*}} type: ![[pmf_d:[^, ]*]], {{.*}})
 // CHECK: ![[pmf_d]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !{{.*}}, size: 192,
 // CHECK-NOT: flags:
 // CHECK-SAME: ){{$}}
 
 // CHECK: distinct !DIGlobalVariable(name: "ppmd", {{.*}} type: ![[ppmd:[^, ]*]], {{.*}})
-// CHECK: ![[ppmd]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[ppmd2:[^ ]*]], size: 64, align: 64)
+// CHECK: ![[ppmd]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[ppmd2:[^ ]*]], size: 64)
 // CHECK: ![[ppmd2]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !{{[0-9]*}}, extraData: !{{[0-9]*}}){{$}}
 // CHECK: distinct !DIGlobalVariable(name: "ppmf", {{.*}} type: ![[ppmf:[^, ]*]], {{.*}})
-// CHECK: ![[ppmf]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[ppmf2:[^ ]*]], size: 64, align: 64)
+// CHECK: ![[ppmf]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[ppmf2:[^ ]*]], size: 64)
 // CHECK: ![[ppmf2]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !{{[0-9]*}}, extraData: !{{[0-9]*}}){{$}}
 
 // CHECK: ![[pmd_a]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !{{.*}}, size: 32, flags: DIFlagSingleInheritance, {{.*}})

test/CodeGenCXX/debug-info-rvalue-ref.cpp

 // RUN: %clang_cc1 -std=c++11 -emit-llvm -debug-info-kind=limited -triple x86_64-apple-darwin %s -o - | FileCheck %s
 
 extern "C" {
 extern int printf(const char * format, ...);
 }
 void foo (int &&i)
 {
   printf("%d\n", i);
 }
 
-// CHECK: !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: ![[INT:[0-9]+]], size: 64, align: 64)
+// CHECK: !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: ![[INT:[0-9]+]], size: 64)
 // CHECK: ![[INT]] = !DIBasicType(name: "int"

test/CodeGenCXX/debug-info-template-quals.cpp

 
 void foo (const char *c) {
   basic_string<char> str;
   str.assign(c, str);
 }
 
 // CHECK: [[P:![0-9]*]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: [[CON:![0-9]*]]
 // CHECK: [[CON]] = !DIDerivedType(tag: DW_TAG_const_type, baseType: [[CH:![0-9]*]]
-// CHECK: [[CH]] = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
+// CHECK: [[CH]] = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
 // CHECK: [[BS:.*]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "basic_string<char>"
 // CHECK-SAME:                         line: 4
-// CHECK-SAME:                         size: 8, align: 8
+// CHECK-SAME:                         size: 8
 // CHECK: [[TYPE:![0-9]*]] = !DISubroutineType(types: [[ARGS:.*]])
 // CHECK: [[ARGS]] = !{!{{.*}}, !{{.*}}, [[P]], [[R:.*]]}
 
 // CHECK: [[R]] = !DIDerivedType(tag: DW_TAG_reference_type, baseType: [[CON2:![0-9]*]]
 // CHECK: [[CON2]] = !DIDerivedType(tag: DW_TAG_const_type, baseType: [[BS]]
 // CHECK: !DISubprogram(name: "assign"
 // CHECK-SAME:          line: 7
 // CHECK-SAME:          scopeLine: 8

test/CodeGenCXX/debug-info-template.cpp

 // use it (GCC doesn't emit a value for pointers to member functions either - so
 // it's not clear what, if any, format would be acceptable to GDB)
 //
 // CHECK: [[FTYPE:![0-9]*]] = !DISubroutineType(types: [[FARGS:![0-9]*]])
 // CHECK: [[FARGS]] = !{null, [[FARG1:![0-9]*]]}
 // CHECK: [[FARG1]] = !DIDerivedType(tag: DW_TAG_pointer_type,
 // CHECK-SAME:                       baseType: ![[FOO]]
 // CHECK-NOT:                        line:
-// CHECK-SAME:                       size: 64, align: 64
+// CHECK-SAME:                       size: 64
 // CHECK-NOT:                        offset: 0
 // CHECK-SAME:                       DIFlagArtificial
 // CHECK: [[FUNTYPE:![0-9]*]] = !DISubroutineType(types: [[FUNARGS:![0-9]*]])
 // CHECK: [[FUNARGS]] = !{null}
   &foo::e,
 // CHECK: [[TCARG5]] = !DITemplateValueParameter(name: "b", type: [[MEMFUNPTR:![0-9]*]], value: { i64, i64 } { i64 ptrtoint (void (%struct.foo*)* @_ZN3foo1fEv to i64), i64 0 })
 // CHECK: [[MEMFUNPTR]] = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, {{.*}}baseType: [[FTYPE]], {{.*}}extraData: ![[FOO]])
   &foo::f,

 };
 
 PaddingAtEnd PaddedObj = {};
 
 // CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "PaddingAtEndTemplate<&PaddedObj>"
 // CHECK-SAME:             templateParams: [[PTOARGS:![0-9]*]]
 // CHECK: [[PTOARGS]] = !{[[PTOARG1:![0-9]*]]}
 // CHECK: [[PTOARG1]] = !DITemplateValueParameter(type: [[CONST_PADDINGATEND_PTR:![0-9]*]], value: %struct.PaddingAtEnd* @PaddedObj)
-// CHECK: [[CONST_PADDINGATEND_PTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[PADDINGATEND]], size: 64, align: 64)
+// CHECK: [[CONST_PADDINGATEND_PTR]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[PADDINGATEND]], size: 64)
 template <PaddingAtEnd *>
 struct PaddingAtEndTemplate {
 };
 
 PaddingAtEndTemplate<&PaddedObj> PaddedTemplateObj;

test/CodeGenCXX/debug-info-union.cpp

 // RUN: %clang_cc1 -emit-llvm -debug-info-kind=limited -triple x86_64-apple-darwin -std=c++11 %s -o - | FileCheck %s
 
 union E {
   int a;
   float b;
   int bb() { return a;}
   float aa() { return b;}
   E() { a = 0; }
 };
 
 E e;
 
 // CHECK: !DICompositeType(tag: DW_TAG_union_type, name: "E"
 // CHECK-SAME:             line: 3
-// CHECK-SAME:             size: 32, align: 32
+// CHECK-SAME:             size: 32
 // CHECK-NOT:              offset:
 // CHECK-SAME:             {{$}}
 // CHECK: !DISubprogram(name: "bb"{{.*}}, line: 6
 // CHECK: !DISubprogram(name: "aa"{{.*}}, line: 7
 // CHECK: !DISubprogram(name: "E"{{.*}}, line: 8

test/CodeGenCXX/debug-info-uuid.cpp

 // CHECK-SAME:             templateParams: [[TGIARGS:![0-9]*]]
 // CHECK: [[TGIARGS]] = !{[[TGIARG1:![0-9]*]]}
 // CHECK: [[TGIARG1]] = !DITemplateValueParameter(
 // CHECK-SAME:                                    type: [[CONST_GUID_PTR:![0-9]*]]
 // CHECK-SAME:                                    value: { i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab
 // CHECK: [[CONST_GUID_PTR]] = !DIDerivedType(tag: DW_TAG_pointer_type
 // CHECK-SAME:                                baseType: [[CONST_GUID:![0-9]*]]
 // CHECK-SAME:                                size: 64
-// CHECK-SAME:                                align: 64
 
 // CHECK-ITANIUM: !DICompositeType(tag: DW_TAG_structure_type, name: "tmpl_guid2<__uuidof(uuid)>"
 // CHECK-ITANIUM-SAME:             identifier: "_ZTS10tmpl_guid2IXu8__uuidoft4uuidEE"
 // CHECK-ITANIUM: !DICompositeType(tag: DW_TAG_structure_type, name: "tmpl_guid<&__uuidof(uuid)>"
 // CHECK-ITANIUM-SAME:             identifier: "_ZTS9tmpl_guidIXadu8__uuidoft4uuidEE"
 
 struct _GUID;
 template <const _GUID *>

test/CodeGenCXX/debug-info-vla.cpp

 // RUN: %clang -target x86_64-unknown-unknown -fverbose-asm -g -O0 -S -emit-llvm %s -o - | FileCheck %s
 
 
 void f(int m) {
   int x[3][m];
 }
 
 // CHECK: !DICompositeType(tag: DW_TAG_array_type,
 // CHECK-NOT:                               size:
-// CHECK-SAME:                              align: 32
 // CHECK-SAME:                              elements: [[ELEM_TYPE:![0-9]+]]
 // CHECK: [[ELEM_TYPE]] = !{[[SUB1:.*]], [[SUB2:.*]]}
 // CHECK: [[SUB1]] = !DISubrange(count: 3)
 // CHECK: [[SUB2]] = !DISubrange(count: -1)

test/CodeGenCXX/debug-info-zero-length-arrays.cpp

 // RUN: %clang -target x86_64-unknown-unknown -fverbose-asm -g -O0 -S -emit-llvm %s -o - | FileCheck %s
 // <rdar://problem/12566646>
 
 class A {
   int x[];
 };
 A a;
 
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "x"
 // CHECK-SAME:           baseType: [[ARRAY_TYPE:![0-9]+]]
 // CHECK: [[ARRAY_TYPE]] = !DICompositeType(tag: DW_TAG_array_type,
 // CHECK-NOT:                               size:
-// CHECK-SAME:                              align: 32
 // CHECK-SAME:                              elements: [[ELEM_TYPE:![0-9]+]]
 // CHECK: [[ELEM_TYPE]] = !{[[SUBRANGE:.*]]}
 // CHECK: [[SUBRANGE]] = !DISubrange(count: -1)

test/CodeGenCXX/debug-info.cpp

namespace VirtualDtor {
   
   Y::~Y() { }
 }
 
 namespace VirtualBase {
   struct A { int a; };
   struct B : virtual A { int b; };
 // BOTH: ![[VBASE_B:[0-9]+]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "B",{{.*}} line: [[@LINE-1]],
-// MSVC-SAME:                                        size: 96, align: 32
-// CHECK-SAME:                                       size: 128, align: 64,
+// MSVC-SAME:                                        size: 96
+// CHECK-SAME:                                       size: 128,
 // BOTH-NOT:                                         offset:
 // BOTH-NOT:                                         DIFlagFwdDecl
 // BOTH-SAME:                                        elements: [[VBASE_B_DEF:![0-9]+]]
 // BOTH: [[VBASE_B_DEF]] = !{[[VBASE_A_IN_B:![0-9]+]],
 //
 // Look for the vbtable offset of A, which should be 4 for MSVC, 24 otherwise.
 // BOTH: [[VBASE_A_IN_B]] = !DIDerivedType(tag: DW_TAG_inheritance, scope: ![[VBASE_B]],
 // BOTH-SAME:                              baseType: ![[VBASE_A:[0-9]+]],

test/CodeGenCXX/debug-lambda-this.cpp

 // RUN: %clang_cc1 -triple x86_64-apple-darwin10.0.0 -emit-llvm -o - %s -fexceptions -std=c++11 -debug-info-kind=limited | FileCheck %s
 
 struct D {
   D();
   D(const D&);
   int x;
   int d(int x);
 };
 int D::d(int x) {
   [=] {
     return this->x;
   }();
 }
 
 // CHECK: ![[D:[0-9]+]] = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "D",
-// CHECK: ![[POINTER:.*]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[D]], size: 64, align: 64)
+// CHECK: ![[POINTER:.*]] = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: ![[D]], size: 64)
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "this",
 // CHECK-SAME:           line: 11
 // CHECK-SAME:           baseType: ![[POINTER]]
-// CHECK-SAME:           size: 64, align: 64
+// CHECK-SAME:           size: 64
 // CHECK-NOT:            offset: 0
 // CHECK-SAME:           ){{$}}

test/CodeGenObjC/block-byref-debuginfo.m

 // RUN: %clang_cc1 -fblocks -fobjc-arc -fobjc-runtime-has-weak -debug-info-kind=limited -triple x86_64-apple-darwin -emit-llvm %s -o - | FileCheck %s
 
 // rdar://problem/14386148
 // Test that the foo is aligned at an 8 byte boundary in the DWARF
 // expression (256) that locates it inside of the byref descriptor:
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "foo",
 // CHECK-NOT:            line:
-// CHECK-SAME:           align: 64
 // CHECK-SAME:           offset: 256
 
 struct Foo {
   unsigned char *data;
 };
 int func() {
   __attribute__((__blocks__(byref))) struct Foo foo;
   return 0;
 }

test/CodeGenObjC/debug-info-block-type.m

 // CHECK: ![[ID]] = !DIDerivedType(tag: DW_TAG_typedef, name: "id"
 
 typedef BOOL (^SomeKindOfPredicate)(id obj);
 int main()
 {
   SomeKindOfPredicate p = ^BOOL(id obj) { return obj != nil; };
   // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "__FuncPtr",
   // CHECK-SAME:           line: [[@LINE-2]]
-  // CHECK-SAME:           size: 64, align: 64, offset: 128,
+  // CHECK-SAME:           size: 64, offset: 128,
   return p(nil);
 }

test/CodeGenObjC/debug-info-ivars-extension.m

 }
 
 // CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "I"
 
 // Check for "a".
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "a"
 // CHECK-SAME:           line: 7
 // CHECK-SAME:           baseType: ![[INT:[0-9]+]]
-// CHECK-SAME:           size: 32, align: 32
+// CHECK-SAME:           size: 32
 // CHECK-NOT:            offset:
 // CHECK-SAME:           flags: DIFlagPublic
 // CHECK: ![[INT]] = !DIBasicType(name: "int"
 
 // Make sure we don't output the same type twice.
 // CHECK-NOT: !DICompositeType(tag: DW_TAG_structure_type, name: "I"
 
 // Check for "b".
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "b"
 // CHECK-SAME:           line: 18
 // CHECK-SAME:           baseType: ![[INT]]
-// CHECK-SAME:           size: 32, align: 32
+// CHECK-SAME:           size: 32
 // CHECK-NOT:            offset:
 // CHECK-SAME:           flags: DIFlagPublic

test/CodeGenObjC/debug-info-ivars-private.m

 - (void)g:(NSObject*) anObject {
   bar = foo;
 }
 @end
 
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "foo"
 // CHECK-SAME:           line: 14
 // CHECK-SAME:           baseType: ![[INT:[0-9]+]]
-// CHECK-SAME:           size: 32, align: 32,
+// CHECK-SAME:           size: 32,
 // CHECK-NOT:            offset:
 // CHECK-SAME:           flags: DIFlagProtected
 // CHECK: ![[INT]] = !DIBasicType(name: "int"
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "bar"
 // CHECK-SAME:           line: 27
 // CHECK-SAME:           baseType: ![[INT:[0-9]+]]
-// CHECK-SAME:           size: 32, align: 32,
+// CHECK-SAME:           size: 32,
 // CHECK-NOT:            offset:
 // CHECK-SAME:           flags: DIFlagPrivate

test/CodeGenObjC/debug-info-ivars.m

 @end
 
 @implementation BaseClass
 @end
 
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "i"
 // CHECK-SAME:           line: 10
 // CHECK-SAME:           baseType: ![[INT:[0-9]+]]
-// CHECK-SAME:           size: 32, align: 32,
+// CHECK-SAME:           size: 32,
 // CHECK-NOT:            offset:
 // CHECK-SAME:           flags: DIFlagProtected
 // CHECK: ![[INT]] = !DIBasicType(name: "int"
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "flag_1"
 // CHECK-SAME:           line: 11
 // CHECK-SAME:           baseType: ![[UNSIGNED:[0-9]+]]
-// CHECK-SAME:           size: 9, align: 32,
+// CHECK-SAME:           size: 9,
 // CHECK-NOT:            offset:
 // CHECK-SAME:           flags: DIFlagProtected
 // CHECK: ![[UNSIGNED]] = !DIBasicType(name: "unsigned int"
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "flag_2"
 // CHECK-SAME:           line: 12
 // CHECK-SAME:           baseType: ![[UNSIGNED]]
-// CHECK-SAME:           size: 9, align: 32, offset: 1,
+// CHECK-SAME:           size: 9, offset: 1,
 // CHECK-SAME:           flags: DIFlagProtected
 // CHECK: !DIDerivedType(tag: DW_TAG_member, name: "flag_3"
 // CHECK-SAME:           line: 14
 // CHECK-SAME:           baseType: ![[UNSIGNED]]
-// CHECK-SAME:           size: 9, align: 32, offset: 3,
+// CHECK-SAME:           size: 9, offset: 3,
 // CHECK-SAME:           flags: DIFlagProtected

test/CodeGenObjCXX/debug-info-cyclic.mm

 // RUN: %clang_cc1 -triple x86_64-apple-darwin -debug-info-kind=standalone -emit-llvm %s -o - | FileCheck %s
 
 struct B {
 // CHECK: ![[B:[0-9]+]] ={{.*}}!DICompositeType(tag: DW_TAG_structure_type, name: "B"
 // CHECK-SAME:                             line: [[@LINE-2]],
-// CHECK-SAME:                             size: 8, align: 8,
+// CHECK-SAME:                             size: 8,
 // CHECK-NOT:                              offset:
 // CHECK-NOT:                              DIFlagFwdDecl
 // CHECK-SAME:                             elements: ![[BMEMBERS:[0-9]+]]
 // CHECK-SAME:                             identifier:
 // CHECK: ![[BMEMBERS]] = !{![[BB:[0-9]+]]}
   B(struct A *);
 // CHECK: ![[BB]] = !DISubprogram(name: "B", scope: ![[B]]
 // CHECK-SAME:                    line: [[@LINE-2]],