RecordLayoutBuilder.cpp revision 9ed9a250180f19b2c44df83a196fc3a2ac82f817
19392fa63e45716e32061d05673fa28909f325b02Anders Carlsson//=== RecordLayoutBuilder.cpp - Helper class for building record layouts ---==// 2bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson// 3bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson// The LLVM Compiler Infrastructure 4bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson// 5bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson// This file is distributed under the University of Illinois Open Source 6bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson// License. See LICENSE.TXT for details. 7bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson// 8bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson//===----------------------------------------------------------------------===// 9bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 10bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson#include "clang/AST/Attr.h" 11245656ec65ec600ef1ab05f4c8d9f780542d689dAnders Carlsson#include "clang/AST/CXXInheritance.h" 12bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson#include "clang/AST/Decl.h" 1374cbe226207fd101623638dadfa7fbada04ff2a6Anders Carlsson#include "clang/AST/DeclCXX.h" 1493fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson#include "clang/AST/DeclObjC.h" 15bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson#include "clang/AST/Expr.h" 169392fa63e45716e32061d05673fa28909f325b02Anders Carlsson#include "clang/AST/RecordLayout.h" 17bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson#include "clang/Basic/TargetInfo.h" 1878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis#include "clang/Sema/SemaDiagnostic.h" 19bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar#include "llvm/Support/Format.h" 20bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar#include "llvm/ADT/SmallSet.h" 21bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar#include "llvm/Support/MathExtras.h" 229392fa63e45716e32061d05673fa28909f325b02Anders Carlsson#include <map> 23bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 24bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlssonusing namespace clang; 25bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 267e220286410422ed1dc0409a9cb9708fe50e3df0Benjamin Kramernamespace { 276a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson 28ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// BaseSubobjectInfo - Represents a single base subobject in a complete class. 29ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// For a class hierarchy like 30ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// 31ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// class A { }; 32ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// class B : A { }; 33ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// class C : A, B { }; 34ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// 35ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// The BaseSubobjectInfo graph for C will have three BaseSubobjectInfo 36ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// instances, one for B and two for A. 37ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// 38ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson/// If a base is virtual, it will only have one BaseSubobjectInfo allocated. 39ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlssonstruct BaseSubobjectInfo { 40ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson /// Class - The class for this base info. 414a25799760982b3363f3c4eb6df953d70e35e37dAnders Carlsson const CXXRecordDecl *Class; 42ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson 43ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson /// IsVirtual - Whether the BaseInfo represents a virtual base or not. 444a25799760982b3363f3c4eb6df953d70e35e37dAnders Carlsson bool IsVirtual; 454a25799760982b3363f3c4eb6df953d70e35e37dAnders Carlsson 46ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson /// Bases - Information about the base subobjects. 47ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson llvm::SmallVector<BaseSubobjectInfo*, 4> Bases; 48ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson 496e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// PrimaryVirtualBaseInfo - Holds the base info for the primary virtual base 506e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// of this base info (if one exists). 516e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryVirtualBaseInfo; 52ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson 53ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson // FIXME: Document. 54ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson const BaseSubobjectInfo *Derived; 554a25799760982b3363f3c4eb6df953d70e35e37dAnders Carlsson}; 564a25799760982b3363f3c4eb6df953d70e35e37dAnders Carlsson 576a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson/// EmptySubobjectMap - Keeps track of which empty subobjects exist at different 586a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson/// offsets while laying out a C++ class. 596a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlssonclass EmptySubobjectMap { 604ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Context; 618c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson uint64_t CharWidth; 628c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson 636a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson /// Class - The class whose empty entries we're keeping track of. 646a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson const CXXRecordDecl *Class; 650aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 6658b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson /// EmptyClassOffsets - A map from offsets to empty record decls. 6758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson typedef llvm::SmallVector<const CXXRecordDecl *, 1> ClassVectorTy; 68d8da76365f40a0c12c7d802a0da2aaacf4b2cf99Anders Carlsson typedef llvm::DenseMap<CharUnits, ClassVectorTy> EmptyClassOffsetsMapTy; 6958b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson EmptyClassOffsetsMapTy EmptyClassOffsets; 7058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 71c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson /// MaxEmptyClassOffset - The highest offset known to contain an empty 72c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson /// base subobject. 73fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits MaxEmptyClassOffset; 74c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson 750aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// ComputeEmptySubobjectSizes - Compute the size of the largest base or 760c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson /// member subobject that is empty. 770c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson void ComputeEmptySubobjectSizes(); 7858b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 79fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson void AddSubobjectAtOffset(const CXXRecordDecl *RD, CharUnits Offset); 80812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 81ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson void UpdateEmptyBaseSubobjects(const BaseSubobjectInfo *Info, 82a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset, bool PlacingEmptyBase); 8358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 84812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson void UpdateEmptyFieldSubobjects(const CXXRecordDecl *RD, 85812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *Class, 86a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset); 87a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson void UpdateEmptyFieldSubobjects(const FieldDecl *FD, CharUnits Offset); 88812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 89c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson /// AnyEmptySubobjectsBeyondOffset - Returns whether there are any empty 90c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson /// subobjects beyond the given offset. 91fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson bool AnyEmptySubobjectsBeyondOffset(CharUnits Offset) const { 92c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson return Offset <= MaxEmptyClassOffset; 93c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson } 94c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson 958c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson CharUnits 968c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson getFieldOffset(const ASTRecordLayout &Layout, unsigned FieldNo) const { 978c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson uint64_t FieldOffset = Layout.getFieldOffset(FieldNo); 988c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson assert(FieldOffset % CharWidth == 0 && 998c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson "Field offset not at char boundary!"); 1008c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson 101ff3a5174d1f6e7dc98de348aecfdfe1d2fb7cd53Ken Dyck return Context.toCharUnitsFromBits(FieldOffset); 102d8da76365f40a0c12c7d802a0da2aaacf4b2cf99Anders Carlsson } 103d8da76365f40a0c12c7d802a0da2aaacf4b2cf99Anders Carlsson 104c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisprotected: 105fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson bool CanPlaceSubobjectAtOffset(const CXXRecordDecl *RD, 106fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits Offset) const; 107c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 108c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis bool CanPlaceBaseSubobjectAtOffset(const BaseSubobjectInfo *Info, 109a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset); 110c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 111c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis bool CanPlaceFieldSubobjectAtOffset(const CXXRecordDecl *RD, 112c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis const CXXRecordDecl *Class, 113a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) const; 114c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis bool CanPlaceFieldSubobjectAtOffset(const FieldDecl *FD, 1158c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson CharUnits Offset) const; 116c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 1176a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlssonpublic: 1180c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson /// This holds the size of the largest empty subobject (either a base 1190aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// or a member). Will be zero if the record being built doesn't contain 1200c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson /// any empty classes. 121a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits SizeOfLargestEmptySubobject; 1220aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1234ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad EmptySubobjectMap(const ASTContext &Context, const CXXRecordDecl *Class) 124a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson : Context(Context), CharWidth(Context.getCharWidth()), Class(Class) { 125261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson ComputeEmptySubobjectSizes(); 126261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson } 127261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson 128261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson /// CanPlaceBaseAtOffset - Return whether the given base class can be placed 129261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson /// at the given offset. 1300aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// Returns false if placing the record will result in two components 131261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson /// (direct or indirect) of the same type having the same offset. 132c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson bool CanPlaceBaseAtOffset(const BaseSubobjectInfo *Info, 133a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset); 134812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 135812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson /// CanPlaceFieldAtOffset - Return whether a field can be placed at the given 136812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson /// offset. 137a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson bool CanPlaceFieldAtOffset(const FieldDecl *FD, CharUnits Offset); 1386a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson}; 1390c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 1400c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlssonvoid EmptySubobjectMap::ComputeEmptySubobjectSizes() { 1410c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Check the bases. 1420c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = Class->bases_begin(), 1430c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson E = Class->bases_end(); I != E; ++I) { 1440c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const CXXRecordDecl *BaseDecl = 1450c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1460c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 147a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits EmptySize; 1480c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(BaseDecl); 1490c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson if (BaseDecl->isEmpty()) { 1500c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // If the class decl is empty, get its size. 1515f022d82696c84e4d127c558871d68ac6273274eKen Dyck EmptySize = Layout.getSize(); 1520c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } else { 1530c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Otherwise, we get the largest empty subobject for the decl. 1540c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson EmptySize = Layout.getSizeOfLargestEmptySubobject(); 1550c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1560aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 157a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (EmptySize > SizeOfLargestEmptySubobject) 158a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson SizeOfLargestEmptySubobject = EmptySize; 1590c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1600aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1610c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Check the fields. 1620c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson for (CXXRecordDecl::field_iterator I = Class->field_begin(), 1630c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson E = Class->field_end(); I != E; ++I) { 1640c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const FieldDecl *FD = *I; 1650aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1660aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar const RecordType *RT = 1670c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson Context.getBaseElementType(FD->getType())->getAs<RecordType>(); 1680aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1690c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // We only care about record types. 1700c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson if (!RT) 1710c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson continue; 1720c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 173a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits EmptySize; 1740c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const CXXRecordDecl *MemberDecl = cast<CXXRecordDecl>(RT->getDecl()); 1750c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(MemberDecl); 1760c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson if (MemberDecl->isEmpty()) { 1770c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // If the class decl is empty, get its size. 1785f022d82696c84e4d127c558871d68ac6273274eKen Dyck EmptySize = Layout.getSize(); 1790c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } else { 1800c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Otherwise, we get the largest empty subobject for the decl. 1810c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson EmptySize = Layout.getSizeOfLargestEmptySubobject(); 1820c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1830aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 184a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (EmptySize > SizeOfLargestEmptySubobject) 185a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson SizeOfLargestEmptySubobject = EmptySize; 1860c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1870c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson} 1880c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 1890aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbarbool 190812a3456b63708a5972f712e9e4b54d3cc436378Anders CarlssonEmptySubobjectMap::CanPlaceSubobjectAtOffset(const CXXRecordDecl *RD, 191fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits Offset) const { 192812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We only need to check empty bases. 193812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RD->isEmpty()) 194812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 195812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 196fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson EmptyClassOffsetsMapTy::const_iterator I = EmptyClassOffsets.find(Offset); 197812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (I == EmptyClassOffsets.end()) 198812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 199812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 200812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ClassVectorTy& Classes = I->second; 201812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (std::find(Classes.begin(), Classes.end(), RD) == Classes.end()) 202812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 203812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 204812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // There is already an empty class of the same type at this offset. 205812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 206812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 207812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 208812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonvoid EmptySubobjectMap::AddSubobjectAtOffset(const CXXRecordDecl *RD, 209fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits Offset) { 210812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We only care about empty bases. 211812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RD->isEmpty()) 212812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return; 213812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 214272324bc881450a71873d2f4e72f17837d8998dfRafael Espindola // If we have empty structures inside an union, we can assign both 215272324bc881450a71873d2f4e72f17837d8998dfRafael Espindola // the same offset. Just avoid pushing them twice in the list. 216fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson ClassVectorTy& Classes = EmptyClassOffsets[Offset]; 217272324bc881450a71873d2f4e72f17837d8998dfRafael Espindola if (std::find(Classes.begin(), Classes.end(), RD) != Classes.end()) 218272324bc881450a71873d2f4e72f17837d8998dfRafael Espindola return; 219272324bc881450a71873d2f4e72f17837d8998dfRafael Espindola 220812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson Classes.push_back(RD); 221c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson 222c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson // Update the empty class offset. 223fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson if (Offset > MaxEmptyClassOffset) 224fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson MaxEmptyClassOffset = Offset; 225812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 226812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 227812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonbool 228a3d4380d6662a373bc78f915947e5bc06e985e91Anders CarlssonEmptySubobjectMap::CanPlaceBaseSubobjectAtOffset(const BaseSubobjectInfo *Info, 229a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 2302177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 2312177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 232a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!AnyEmptySubobjectsBeyondOffset(Offset)) 2332177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 2342177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 235a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceSubobjectAtOffset(Info->Class, Offset)) 236812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 237812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 23858b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson // Traverse all non-virtual bases. 2394137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Info->Class); 24058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson for (unsigned I = 0, E = Info->Bases.size(); I != E; ++I) { 241ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson BaseSubobjectInfo* Base = Info->Bases[I]; 24258b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Base->IsVirtual) 24358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson continue; 24458b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 2456a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base->Class); 24658b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 24758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (!CanPlaceBaseSubobjectAtOffset(Base, BaseOffset)) 24858b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return false; 24958b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 25058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 2516e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (Info->PrimaryVirtualBaseInfo) { 2526e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryVirtualBaseInfo = Info->PrimaryVirtualBaseInfo; 25358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 25458b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Info == PrimaryVirtualBaseInfo->Derived) { 25558b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (!CanPlaceBaseSubobjectAtOffset(PrimaryVirtualBaseInfo, Offset)) 25658b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return false; 25758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 25858b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 25958b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 260812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 261812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 262812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = Info->Class->field_begin(), 263812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = Info->Class->field_end(); I != E; ++I, ++FieldNo) { 264812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 2658c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (FD->isBitField()) 2668c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson continue; 2678c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson 268a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 269812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(FD, FieldOffset)) 270812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 271812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 272812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 27358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return true; 27458b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson} 27558b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 276ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlssonvoid EmptySubobjectMap::UpdateEmptyBaseSubobjects(const BaseSubobjectInfo *Info, 277a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset, 278e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson bool PlacingEmptyBase) { 279e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson if (!PlacingEmptyBase && Offset >= SizeOfLargestEmptySubobject) { 280e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // We know that the only empty subobjects that can conflict with empty 281e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // subobject of non-empty bases, are empty bases that can be placed at 282e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // offset zero. Because of this, we only need to keep track of empty base 283e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // subobjects with offsets less than the size of the largest empty 284e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // subobject for our class. 285e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson return; 286e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson } 287e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson 288a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson AddSubobjectAtOffset(Info->Class, Offset); 2894137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson 29058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson // Traverse all non-virtual bases. 2914137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Info->Class); 29258b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson for (unsigned I = 0, E = Info->Bases.size(); I != E; ++I) { 293ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson BaseSubobjectInfo* Base = Info->Bases[I]; 29458b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Base->IsVirtual) 29558b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson continue; 2964137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson 2976a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base->Class); 298e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson UpdateEmptyBaseSubobjects(Base, BaseOffset, PlacingEmptyBase); 29958b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 30058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 3016e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (Info->PrimaryVirtualBaseInfo) { 3026e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryVirtualBaseInfo = Info->PrimaryVirtualBaseInfo; 30358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 30458b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Info == PrimaryVirtualBaseInfo->Derived) 305e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson UpdateEmptyBaseSubobjects(PrimaryVirtualBaseInfo, Offset, 306e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson PlacingEmptyBase); 30758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 308812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 309812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 310812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 311812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = Info->Class->field_begin(), 312812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = Info->Class->field_end(); I != E; ++I, ++FieldNo) { 313812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 3148c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (FD->isBitField()) 3158c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson continue; 3164137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson 317a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 318a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson UpdateEmptyFieldSubobjects(FD, FieldOffset); 319812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 32058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson} 32158b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 3225b1319c78061e76d70cca50fb3343b25928e001bAnders Carlssonbool EmptySubobjectMap::CanPlaceBaseAtOffset(const BaseSubobjectInfo *Info, 323a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 324261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson // If we know this class doesn't have any empty subobjects we don't need to 325261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson // bother checking. 326a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (SizeOfLargestEmptySubobject.isZero()) 327261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson return true; 328261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson 32958b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (!CanPlaceBaseSubobjectAtOffset(Info, Offset)) 33058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return false; 331812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 332812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We are able to place the base at this offset. Make sure to update the 333812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // empty base subobject map. 334e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson UpdateEmptyBaseSubobjects(Info, Offset, Info->Class->isEmpty()); 335261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson return true; 336261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson} 337261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson 338812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonbool 339812a3456b63708a5972f712e9e4b54d3cc436378Anders CarlssonEmptySubobjectMap::CanPlaceFieldSubobjectAtOffset(const CXXRecordDecl *RD, 340812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *Class, 341a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) const { 3422177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 3432177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 344a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!AnyEmptySubobjectsBeyondOffset(Offset)) 3452177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 3462177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 347a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceSubobjectAtOffset(RD, Offset)) 348812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 349812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 350812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 351812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 352812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all non-virtual bases. 353812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 354812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = RD->bases_end(); I != E; ++I) { 355812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (I->isVirtual()) 356812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson continue; 357812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 358812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *BaseDecl = 359812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 360812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 3616a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(BaseDecl); 362812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(BaseDecl, Class, BaseOffset)) 363812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 364812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 365812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 36645f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson if (RD == Class) { 36745f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson // This is the most derived class, traverse virtual bases as well. 36845f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 36945f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson E = RD->vbases_end(); I != E; ++I) { 37045f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson const CXXRecordDecl *VBaseDecl = 37145f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 37245f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 3733069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits VBaseOffset = Offset + Layout.getVBaseClassOffset(VBaseDecl); 37445f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson if (!CanPlaceFieldSubobjectAtOffset(VBaseDecl, Class, VBaseOffset)) 37545f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson return false; 37645f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 37745f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 37845f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 379812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 380812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 381812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 382812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson I != E; ++I, ++FieldNo) { 383812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 3848c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (FD->isBitField()) 3858c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson continue; 3868c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson 387a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 388812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 389812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(FD, FieldOffset)) 390812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 391812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 392812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 393812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 394812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 395812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 3968c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlssonbool 3978c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders CarlssonEmptySubobjectMap::CanPlaceFieldSubobjectAtOffset(const FieldDecl *FD, 3988c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson CharUnits Offset) const { 3992177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 4002177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 4018c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (!AnyEmptySubobjectsBeyondOffset(Offset)) 4022177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 4032177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 404812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType T = FD->getType(); 405812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const RecordType *RT = T->getAs<RecordType>()) { 406812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 407a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson return CanPlaceFieldSubobjectAtOffset(RD, RD, Offset); 408812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 409812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 410812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // If we have an array type we need to look at every element. 411812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const ConstantArrayType *AT = Context.getAsConstantArrayType(T)) { 412812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType ElemTy = Context.getBaseElementType(AT); 413812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const RecordType *RT = ElemTy->getAs<RecordType>(); 414812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RT) 415812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 416812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 417812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 418812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 419812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 420812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson uint64_t NumElements = Context.getConstantArrayElementCount(AT); 4218c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson CharUnits ElementOffset = Offset; 422812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (uint64_t I = 0; I != NumElements; ++I) { 4232177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 4242177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 4258c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (!AnyEmptySubobjectsBeyondOffset(ElementOffset)) 4262177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 4272177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 428a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(RD, RD, ElementOffset)) 429812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 430812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 4315f022d82696c84e4d127c558871d68ac6273274eKen Dyck ElementOffset += Layout.getSize(); 432812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 433812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 434812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 435812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 436812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 437812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 438812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonbool 439a3d4380d6662a373bc78f915947e5bc06e985e91Anders CarlssonEmptySubobjectMap::CanPlaceFieldAtOffset(const FieldDecl *FD, 440a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 441a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(FD, Offset)) 442812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 443812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 444812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We are able to place the member variable at this offset. 445812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Make sure to update the empty base subobject map. 446812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(FD, Offset); 447812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 448812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 449812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 450812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonvoid EmptySubobjectMap::UpdateEmptyFieldSubobjects(const CXXRecordDecl *RD, 451812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *Class, 452a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 4535ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // We know that the only empty subobjects that can conflict with empty 454e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // field subobjects are subobjects of empty bases that can be placed at offset 4555ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // zero. Because of this, we only need to keep track of empty field 4565ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobjects with offsets less than the size of the largest empty 4575ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobject for our class. 4585ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson if (Offset >= SizeOfLargestEmptySubobject) 4595ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson return; 4605ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson 461a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson AddSubobjectAtOffset(RD, Offset); 462812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 463812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 464812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 465812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all non-virtual bases. 466812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 467812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = RD->bases_end(); I != E; ++I) { 468812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (I->isVirtual()) 469812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson continue; 470812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 471812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *BaseDecl = 472812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 473812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 4746a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(BaseDecl); 475812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(BaseDecl, Class, BaseOffset); 476812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 477812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 47845f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson if (RD == Class) { 47945f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson // This is the most derived class, traverse virtual bases as well. 48045f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 48145f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson E = RD->vbases_end(); I != E; ++I) { 48245f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson const CXXRecordDecl *VBaseDecl = 48345f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 48445f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 4853069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits VBaseOffset = Offset + Layout.getVBaseClassOffset(VBaseDecl); 48645f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson UpdateEmptyFieldSubobjects(VBaseDecl, Class, VBaseOffset); 48745f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 48845f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 48945f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 490812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 491812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 492812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 493812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson I != E; ++I, ++FieldNo) { 494812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 495fa84fbad4863e030b149febc88288514efca34b2Anders Carlsson if (FD->isBitField()) 496fa84fbad4863e030b149febc88288514efca34b2Anders Carlsson continue; 497fa84fbad4863e030b149febc88288514efca34b2Anders Carlsson 498a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 499812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 500a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson UpdateEmptyFieldSubobjects(FD, FieldOffset); 501812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 502812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 503812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 504812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonvoid EmptySubobjectMap::UpdateEmptyFieldSubobjects(const FieldDecl *FD, 505a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 506812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType T = FD->getType(); 507812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const RecordType *RT = T->getAs<RecordType>()) { 508812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 509812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(RD, RD, Offset); 510812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return; 511812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 512812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 513812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // If we have an array type we need to update every element. 514812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const ConstantArrayType *AT = Context.getAsConstantArrayType(T)) { 515812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType ElemTy = Context.getBaseElementType(AT); 516812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const RecordType *RT = ElemTy->getAs<RecordType>(); 517812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RT) 518812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return; 519812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 520812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 521812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 522812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 523812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson uint64_t NumElements = Context.getConstantArrayElementCount(AT); 524a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits ElementOffset = Offset; 525812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 526812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (uint64_t I = 0; I != NumElements; ++I) { 5275ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // We know that the only empty subobjects that can conflict with empty 528e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // field subobjects are subobjects of empty bases that can be placed at 5295ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // offset zero. Because of this, we only need to keep track of empty field 5305ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobjects with offsets less than the size of the largest empty 5315ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobject for our class. 5325ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson if (ElementOffset >= SizeOfLargestEmptySubobject) 5335ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson return; 5345ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson 535812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(RD, RD, ElementOffset); 5365f022d82696c84e4d127c558871d68ac6273274eKen Dyck ElementOffset += Layout.getSize(); 537812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 538812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 539812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 540812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 5417d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonclass RecordLayoutBuilder { 542c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisprotected: 5439392fa63e45716e32061d05673fa28909f325b02Anders Carlsson // FIXME: Remove this and make the appropriate fields public. 5449392fa63e45716e32061d05673fa28909f325b02Anders Carlsson friend class clang::ASTContext; 5450aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5464ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ASTContext &Context; 5479392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 5486a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson EmptySubobjectMap *EmptySubobjects; 5490aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5509392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Size - The current size of the record layout. 5519392fa63e45716e32061d05673fa28909f325b02Anders Carlsson uint64_t Size; 5520aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5539392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Alignment - The current alignment of the record layout. 554ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck CharUnits Alignment; 5550aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 55678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis /// \brief The alignment if attribute packed is not used. 5576feb4bb3defce7e5efc05a69c6bd7dfc9c59fa45Ken Dyck CharUnits UnpackedAlignment; 55878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 5599392fa63e45716e32061d05673fa28909f325b02Anders Carlsson llvm::SmallVector<uint64_t, 16> FieldOffsets; 5609392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 5619392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Packed - Whether the record is packed or not. 562c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar unsigned Packed : 1; 563c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar 564c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar unsigned IsUnion : 1; 565c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar 566c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar unsigned IsMac68kAlign : 1; 5679392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 5689392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// UnfilledBitsInLastByte - If the last field laid out was a bitfield, 5699392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// this contains the number of bits in the last byte that can be used for 5709392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// an adjacent bitfield if necessary. 5719392fa63e45716e32061d05673fa28909f325b02Anders Carlsson unsigned char UnfilledBitsInLastByte; 5720aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5739392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// MaxFieldAlignment - The maximum allowed field alignment. This is set by 5740aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// #pragma pack. 575834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck CharUnits MaxFieldAlignment; 5760aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5779392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// DataSize - The data size of the record being laid out. 5789392fa63e45716e32061d05673fa28909f325b02Anders Carlsson uint64_t DataSize; 5790aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 580a1fdb0bc09aa0d17841cdbdd8c52cd1368251cbfKen Dyck CharUnits NonVirtualSize; 581df205382dae666b011d857402114e4f4acd56c81Ken Dyck CharUnits NonVirtualAlignment; 5820aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5839392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// PrimaryBase - the primary base class (if one exists) of the class 5849392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// we're laying out. 5859392fa63e45716e32061d05673fa28909f325b02Anders Carlsson const CXXRecordDecl *PrimaryBase; 5860aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5879392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// PrimaryBaseIsVirtual - Whether the primary base of the class we're laying 5889392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// out is virtual. 5899392fa63e45716e32061d05673fa28909f325b02Anders Carlsson bool PrimaryBaseIsVirtual; 5909392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 591376bda924ac92462a22d6a22ea65d8c1bb8f26f3Anders Carlsson typedef llvm::DenseMap<const CXXRecordDecl *, CharUnits> BaseOffsetsMapTy; 5920aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5939392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Bases - base classes and their offsets in the record. 5949392fa63e45716e32061d05673fa28909f325b02Anders Carlsson BaseOffsetsMapTy Bases; 5950aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5969392fa63e45716e32061d05673fa28909f325b02Anders Carlsson // VBases - virtual base classes and their offsets in the record. 5979392fa63e45716e32061d05673fa28909f325b02Anders Carlsson BaseOffsetsMapTy VBases; 5989392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 5999392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// IndirectPrimaryBases - Virtual base classes, direct or indirect, that are 6009392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// primary base classes for some other direct or indirect base class. 601245656ec65ec600ef1ab05f4c8d9f780542d689dAnders Carlsson CXXIndirectPrimaryBaseSet IndirectPrimaryBases; 6020aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 6039392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// FirstNearlyEmptyVBase - The first nearly empty virtual base class in 6049392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// inheritance graph order. Used for determining the primary base class. 6059392fa63e45716e32061d05673fa28909f325b02Anders Carlsson const CXXRecordDecl *FirstNearlyEmptyVBase; 6069392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6079392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// VisitedVirtualBases - A set of all the visited virtual bases, used to 6089392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// avoid visiting virtual bases more than once. 6099392fa63e45716e32061d05673fa28909f325b02Anders Carlsson llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBases; 6100aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 6114ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad RecordLayoutBuilder(const ASTContext &Context, EmptySubobjectMap 6124ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad *EmptySubobjects) 613ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck : Context(Context), EmptySubobjects(EmptySubobjects), Size(0), 6146feb4bb3defce7e5efc05a69c6bd7dfc9c59fa45Ken Dyck Alignment(CharUnits::One()), UnpackedAlignment(Alignment), 615ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck Packed(false), IsUnion(false), IsMac68kAlign(false), 616834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck UnfilledBitsInLastByte(0), MaxFieldAlignment(CharUnits::Zero()), 617834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck DataSize(0), NonVirtualSize(CharUnits::Zero()), 618834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck NonVirtualAlignment(CharUnits::One()), PrimaryBase(0), 619834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck PrimaryBaseIsVirtual(false), FirstNearlyEmptyVBase(0) { } 6200aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 6219392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void Layout(const RecordDecl *D); 622c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson void Layout(const CXXRecordDecl *D); 6239392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void Layout(const ObjCInterfaceDecl *D); 6249392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6259392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutFields(const RecordDecl *D); 6269392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutField(const FieldDecl *D); 62778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void LayoutWideBitField(uint64_t FieldSize, uint64_t TypeSize, 62878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool FieldPacked, const FieldDecl *D); 6299392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutBitField(const FieldDecl *D); 6309392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6316e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// BaseSubobjectInfoAllocator - Allocator for BaseSubobjectInfo objects. 6326e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson llvm::SpecificBumpPtrAllocator<BaseSubobjectInfo> BaseSubobjectInfoAllocator; 6336e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6346e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson typedef llvm::DenseMap<const CXXRecordDecl *, BaseSubobjectInfo *> 6356e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfoMapTy; 6366e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6376e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// VirtualBaseInfo - Map from all the (direct or indirect) virtual bases 6386e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// of the class we're laying out to their base subobject info. 6396e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfoMapTy VirtualBaseInfo; 6406e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6416e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// NonVirtualBaseInfo - Map from all the direct non-virtual bases of the 6426e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// class we're laying out to their base subobject info. 6436e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfoMapTy NonVirtualBaseInfo; 6446e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6456e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// ComputeBaseSubobjectInfo - Compute the base subobject information for the 6466e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// bases of the given class. 6476e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson void ComputeBaseSubobjectInfo(const CXXRecordDecl *RD); 6486e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6496e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// ComputeBaseSubobjectInfo - Compute the base subobject information for a 6506e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// single class and all of its base classes. 6516e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *ComputeBaseSubobjectInfo(const CXXRecordDecl *RD, 6526e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual, 6536e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Derived); 6549392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6559392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// DeterminePrimaryBase - Determine the primary base of the given class. 6569392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void DeterminePrimaryBase(const CXXRecordDecl *RD); 6579392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6589392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void SelectPrimaryVBase(const CXXRecordDecl *RD); 6590aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 660c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis virtual uint64_t GetVirtualPointersSize(const CXXRecordDecl *RD) const; 661c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 6620aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// LayoutNonVirtualBases - Determines the primary base class (if any) and 6639392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// lays it out. Will then proceed to lay out all non-virtual base clasess. 6649392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutNonVirtualBases(const CXXRecordDecl *RD); 6659392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6669392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// LayoutNonVirtualBase - Lays out a single non-virtual base. 66707cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson void LayoutNonVirtualBase(const BaseSubobjectInfo *Base); 6689392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 669a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson void AddPrimaryVirtualBaseOffsets(const BaseSubobjectInfo *Info, 670a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset); 6719392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6729392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// LayoutVirtualBases - Lays out all the virtual bases. 6739392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutVirtualBases(const CXXRecordDecl *RD, 6749392fa63e45716e32061d05673fa28909f325b02Anders Carlsson const CXXRecordDecl *MostDerivedClass); 6759392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6769392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// LayoutVirtualBase - Lays out a single virtual base. 677276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson void LayoutVirtualBase(const BaseSubobjectInfo *Base); 6789392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6790aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// LayoutBase - Will lay out a base and return the offset where it was 680a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson /// placed, in chars. 681a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits LayoutBase(const BaseSubobjectInfo *Base); 6829392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 683c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson /// InitializeLayout - Initialize record layout for the given record decl. 684c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar void InitializeLayout(const Decl *D); 685c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 6869392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// FinishLayout - Finalize record layout. Adjust record size based on the 6879392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// alignment. 68878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void FinishLayout(const NamedDecl *D); 68978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 6903263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck void UpdateAlignment(CharUnits NewAlignment, CharUnits UnpackedNewAlignment); 6913263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck void UpdateAlignment(CharUnits NewAlignment) { 69278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UpdateAlignment(NewAlignment, NewAlignment); 69378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 69478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 69578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void CheckFieldPadding(uint64_t Offset, uint64_t UnpaddedOffset, 69678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedOffset, unsigned UnpackedAlign, 69778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool isPacked, const FieldDecl *D); 6989392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 69978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID); 7009392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 701c83d2d7d8914a0fe00d679a262f2bdae7689f16dArgyrios Kyrtzidis RecordLayoutBuilder(const RecordLayoutBuilder&); // DO NOT IMPLEMENT 702c83d2d7d8914a0fe00d679a262f2bdae7689f16dArgyrios Kyrtzidis void operator=(const RecordLayoutBuilder&); // DO NOT IMPLEMENT 7039392fa63e45716e32061d05673fa28909f325b02Anders Carlssonpublic: 7049392fa63e45716e32061d05673fa28909f325b02Anders Carlsson static const CXXMethodDecl *ComputeKeyFunction(const CXXRecordDecl *RD); 705cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis 706cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis virtual ~RecordLayoutBuilder() { } 7079392fa63e45716e32061d05673fa28909f325b02Anders Carlsson}; 7087e220286410422ed1dc0409a9cb9708fe50e3df0Benjamin Kramer} // end anonymous namespace 7099392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 7103f066522342538509cf0aa4f381503b43fbdb68bAnders Carlssonvoid 7117d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::SelectPrimaryVBase(const CXXRecordDecl *RD) { 712584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 713bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->bases_end(); I != E; ++I) { 714584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson assert(!I->getType()->isDependentType() && 7159994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl "Cannot layout class with dependent bases."); 716bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 7171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const CXXRecordDecl *Base = 718584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 719200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 720584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // Check if this is a nearly empty virtual base. 721dae0cb52e4e3d46bbfc9a4510909522197a92e54Anders Carlsson if (I->isVirtual() && Context.isNearlyEmpty(Base)) { 722584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // If it's not an indirect primary base, then we've found our primary 723584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // base. 7243f066522342538509cf0aa4f381503b43fbdb68bAnders Carlsson if (!IndirectPrimaryBases.count(Base)) { 72528fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = Base; 72628fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = true; 727d76264e0b20470267249660ab947197cf6d6e31fMike Stump return; 728d76264e0b20470267249660ab947197cf6d6e31fMike Stump } 729bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 730584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // Is this the first nearly empty virtual base? 731584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson if (!FirstNearlyEmptyVBase) 732584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson FirstNearlyEmptyVBase = Base; 733d76264e0b20470267249660ab947197cf6d6e31fMike Stump } 734bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 735200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson SelectPrimaryVBase(Base); 73628fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBase) 73794ba380b820cde3fb9d97d5f07ac709ebbb6ac1eZhongxing Xu return; 738d76264e0b20470267249660ab947197cf6d6e31fMike Stump } 739d76264e0b20470267249660ab947197cf6d6e31fMike Stump} 740d76264e0b20470267249660ab947197cf6d6e31fMike Stump 741c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisuint64_t 742c9f8aece7e111f90265dfad9a81f3f517be948deCharles DavisRecordLayoutBuilder::GetVirtualPointersSize(const CXXRecordDecl *RD) const { 743c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis return Context.Target.getPointerWidth(0); 744c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis} 745c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 746200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson/// DeterminePrimaryBase - Determine the primary base of the given class. 7477d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::DeterminePrimaryBase(const CXXRecordDecl *RD) { 748200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // If the class isn't dynamic, it won't have a primary base. 749200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (!RD->isDynamicClass()) 750200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson return; 751bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 7523f066522342538509cf0aa4f381503b43fbdb68bAnders Carlsson // Compute all the primary virtual bases for all of our direct and 7530880e75541899bc1cdd73c50eb549110b5916c59Mike Stump // indirect bases, and record all their primary virtual base classes. 754245656ec65ec600ef1ab05f4c8d9f780542d689dAnders Carlsson RD->getIndirectPrimaryBases(IndirectPrimaryBases); 7550880e75541899bc1cdd73c50eb549110b5916c59Mike Stump 756bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // If the record has a dynamic base class, attempt to choose a primary base 757bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // class. It is the first (in direct base class order) non-virtual dynamic 7583f066522342538509cf0aa4f381503b43fbdb68bAnders Carlsson // base class, if one exists. 7596f376336138ea719e3c4757ae046a5768043b276Mike Stump for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 760bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar e = RD->bases_end(); i != e; ++i) { 761ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson // Ignore virtual bases. 762ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson if (i->isVirtual()) 763ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson continue; 764bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 765ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson const CXXRecordDecl *Base = 766ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 767ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson 768ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson if (Base->isDynamicClass()) { 769ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson // We found it. 77028fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = Base; 77128fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = false; 772ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson return; 7736f376336138ea719e3c4757ae046a5768043b276Mike Stump } 7746f376336138ea719e3c4757ae046a5768043b276Mike Stump } 7756f376336138ea719e3c4757ae046a5768043b276Mike Stump 7766f376336138ea719e3c4757ae046a5768043b276Mike Stump // Otherwise, it is the first nearly empty virtual base that is not an 77749520944c688a9d5fc78d0c2af544b825873477bMike Stump // indirect primary virtual base class, if one exists. 778200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (RD->getNumVBases() != 0) { 779200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson SelectPrimaryVBase(RD); 78028fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBase) 781200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson return; 782200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson } 7836f376336138ea719e3c4757ae046a5768043b276Mike Stump 784200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Otherwise, it is the first nearly empty virtual base that is not an 785200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // indirect primary virtual base class, if one exists. 786200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (FirstNearlyEmptyVBase) { 78728fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = FirstNearlyEmptyVBase; 78828fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = true; 7896f376336138ea719e3c4757ae046a5768043b276Mike Stump return; 790200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson } 791bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 792200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Otherwise there is no primary base class. 79328fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson assert(!PrimaryBase && "Should not get here with a primary base!"); 794200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 795200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Allocate the virtual table pointer at offset zero. 796200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson assert(DataSize == 0 && "Vtable pointer must be at offset zero!"); 797bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 798200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Update the size. 799c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Size += GetVirtualPointersSize(RD); 800200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson DataSize = Size; 801200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 8023263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck CharUnits UnpackedBaseAlign = 8033263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck Context.toCharUnitsFromBits(Context.Target.getPointerAlign(0)); 8043263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck CharUnits BaseAlign = (Packed) ? CharUnits::One() : UnpackedBaseAlign; 8055a821198203bdd469175408c4c4c805cc3240159Argyrios Kyrtzidis 8065a821198203bdd469175408c4c4c805cc3240159Argyrios Kyrtzidis // The maximum field alignment overrides base align. 807834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck if (!MaxFieldAlignment.isZero()) { 8083263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck BaseAlign = std::min(BaseAlign, MaxFieldAlignment); 8093263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck UnpackedBaseAlign = std::min(UnpackedBaseAlign, MaxFieldAlignment); 8105a821198203bdd469175408c4c4c805cc3240159Argyrios Kyrtzidis } 8115a821198203bdd469175408c4c4c805cc3240159Argyrios Kyrtzidis 812200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Update the alignment. 8135a821198203bdd469175408c4c4c805cc3240159Argyrios Kyrtzidis UpdateAlignment(BaseAlign, UnpackedBaseAlign); 8146f376336138ea719e3c4757ae046a5768043b276Mike Stump} 8156f376336138ea719e3c4757ae046a5768043b276Mike Stump 8166e26454ecceb20938b866717dc8a72c6d37d224dAnders CarlssonBaseSubobjectInfo * 8176e26454ecceb20938b866717dc8a72c6d37d224dAnders CarlssonRecordLayoutBuilder::ComputeBaseSubobjectInfo(const CXXRecordDecl *RD, 8186e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual, 8196e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Derived) { 8206e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Info; 8216e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8226e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (IsVirtual) { 8236e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Check if we already have info about this virtual base. 8246e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *&InfoSlot = VirtualBaseInfo[RD]; 8256e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (InfoSlot) { 8266e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(InfoSlot->Class == RD && "Wrong class for virtual base info!"); 8276e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson return InfoSlot; 8286e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8296e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8306e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // We don't, create it. 8316e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson InfoSlot = new (BaseSubobjectInfoAllocator.Allocate()) BaseSubobjectInfo; 8326e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info = InfoSlot; 8336e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } else { 8346e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info = new (BaseSubobjectInfoAllocator.Allocate()) BaseSubobjectInfo; 8356e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8366e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8376e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->Class = RD; 8386e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->IsVirtual = IsVirtual; 8396e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->Derived = 0; 8406e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->PrimaryVirtualBaseInfo = 0; 8416e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8426e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const CXXRecordDecl *PrimaryVirtualBase = 0; 8436e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryVirtualBaseInfo = 0; 8446e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8456e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Check if this base has a primary virtual base. 8466e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (RD->getNumVBases()) { 8476e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 848c9e814ba193f38a7b08268612248f63beb279bb3Anders Carlsson if (Layout.isPrimaryBaseVirtual()) { 8496e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // This base does have a primary virtual base. 8506e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBase = Layout.getPrimaryBase(); 8516e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(PrimaryVirtualBase && "Didn't have a primary virtual base!"); 8526e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8536e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Now check if we have base subobject info about this primary base. 8546e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo = VirtualBaseInfo.lookup(PrimaryVirtualBase); 8556e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8566e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (PrimaryVirtualBaseInfo) { 8576e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (PrimaryVirtualBaseInfo->Derived) { 8586e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // We did have info about this primary base, and it turns out that it 8596e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // has already been claimed as a primary virtual base for another 8606e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // base. 8616e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBase = 0; 8626e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } else { 8636e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // We can claim this base as our primary base. 8646e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->PrimaryVirtualBaseInfo = PrimaryVirtualBaseInfo; 8656e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo->Derived = Info; 8666e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8676e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8686e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8696e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8706e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8716e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Now go through all direct bases. 8726e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 8736e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson E = RD->bases_end(); I != E; ++I) { 8746e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual = I->isVirtual(); 8756e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8766e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const CXXRecordDecl *BaseDecl = 8776e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 8786e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8796e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->Bases.push_back(ComputeBaseSubobjectInfo(BaseDecl, IsVirtual, Info)); 8806e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8816e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8826e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (PrimaryVirtualBase && !PrimaryVirtualBaseInfo) { 8836e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Traversing the bases must have created the base info for our primary 8846e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // virtual base. 8856e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo = VirtualBaseInfo.lookup(PrimaryVirtualBase); 8866e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(PrimaryVirtualBaseInfo && 8876e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson "Did not create a primary virtual base!"); 8886e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8896e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Claim the primary virtual base as our primary virtual base. 8906e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->PrimaryVirtualBaseInfo = PrimaryVirtualBaseInfo; 8916e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo->Derived = Info; 8926e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8936e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8946e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson return Info; 8956e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson} 8966e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8976e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlssonvoid RecordLayoutBuilder::ComputeBaseSubobjectInfo(const CXXRecordDecl *RD) { 8986e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 8996e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson E = RD->bases_end(); I != E; ++I) { 9006e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual = I->isVirtual(); 9016e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 9026e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const CXXRecordDecl *BaseDecl = 9036e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 9046e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 9056e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Compute the base subobject info for this base. 9066e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Info = ComputeBaseSubobjectInfo(BaseDecl, IsVirtual, 0); 9076e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 9086e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (IsVirtual) { 9096e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // ComputeBaseInfo has already added this base for us. 9106e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(VirtualBaseInfo.count(BaseDecl) && 9116e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson "Did not add virtual base!"); 9126e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } else { 9136e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Add the base info to the map of non-virtual bases. 9146e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(!NonVirtualBaseInfo.count(BaseDecl) && 9156e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson "Non-virtual base already exists!"); 9166e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson NonVirtualBaseInfo.insert(std::make_pair(BaseDecl, Info)); 9176e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 9186e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 9196e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson} 9206e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 921e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlssonvoid 9227d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::LayoutNonVirtualBases(const CXXRecordDecl *RD) { 9236e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Then, determine the primary base class. 924200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson DeterminePrimaryBase(RD); 925bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 9266e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Compute base subobject info. 9276e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson ComputeBaseSubobjectInfo(RD); 9286e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 929200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // If we have a primary base class, lay it out. 93028fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBase) { 93128fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBaseIsVirtual) { 9326e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // If the primary virtual base was a primary virtual base of some other 9336e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // base class we'll have to steal it. 9346e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryBaseInfo = VirtualBaseInfo.lookup(PrimaryBase); 9356e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryBaseInfo->Derived = 0; 9366e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 937200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // We have a virtual primary base, insert it as an indirect primary base. 93828fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson IndirectPrimaryBases.insert(PrimaryBase); 93937147ea14f39a8522e32e3ba4d043a2a33fff90cAnders Carlsson 9400aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar assert(!VisitedVirtualBases.count(PrimaryBase) && 94128fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson "vbase already visited!"); 94228fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson VisitedVirtualBases.insert(PrimaryBase); 9430aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 944276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson LayoutVirtualBase(PrimaryBaseInfo); 94507cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson } else { 94607cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson BaseSubobjectInfo *PrimaryBaseInfo = 94707cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson NonVirtualBaseInfo.lookup(PrimaryBase); 94807cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson assert(PrimaryBaseInfo && 94907cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson "Did not find base info for non-virtual primary base!"); 95007cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson 95107cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson LayoutNonVirtualBase(PrimaryBaseInfo); 95207cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson } 953200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson } 954bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 955200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Now lay out the non-virtual bases. 956200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 957bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->bases_end(); I != E; ++I) { 958200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 959200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Ignore virtual bases. 960200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (I->isVirtual()) 961200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson continue; 962200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 96307cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson const CXXRecordDecl *BaseDecl = 964200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 965200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 966200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Skip the primary base. 96707cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson if (BaseDecl == PrimaryBase && !PrimaryBaseIsVirtual) 968200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson continue; 969200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 970200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Lay out the base. 97107cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson BaseSubobjectInfo *BaseInfo = NonVirtualBaseInfo.lookup(BaseDecl); 97207cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson assert(BaseInfo && "Did not find base info for non-virtual base!"); 97307cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson 97407cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson LayoutNonVirtualBase(BaseInfo); 975e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson } 976e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 977e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 97807cebc57123db6a50c7c293e44a9647ce069952bAnders Carlssonvoid RecordLayoutBuilder::LayoutNonVirtualBase(const BaseSubobjectInfo *Base) { 979e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Layout the base. 980a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset = LayoutBase(Base); 981bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 982e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Add its base class offset. 98307cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson assert(!Bases.count(Base->Class) && "base offset already exists!"); 984a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson Bases.insert(std::make_pair(Base->Class, Offset)); 9853cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 9863cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Base, Offset); 987e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 988968db3364611a475909b5e76969d2f5472e65597Mike Stump 989bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbarvoid 9903cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders CarlssonRecordLayoutBuilder::AddPrimaryVirtualBaseOffsets(const BaseSubobjectInfo *Info, 991a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset) { 9923cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // This base isn't interesting, it has no virtual bases. 9933cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (!Info->Class->getNumVBases()) 9943cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson return; 9953cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 9963cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // First, check if we have a virtual primary base to add offsets for. 9973cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (Info->PrimaryVirtualBaseInfo) { 9983cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson assert(Info->PrimaryVirtualBaseInfo->IsVirtual && 9993cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson "Primary virtual base is not virtual!"); 10003cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (Info->PrimaryVirtualBaseInfo->Derived == Info) { 10013cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // Add the offset. 10023cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson assert(!VBases.count(Info->PrimaryVirtualBaseInfo->Class) && 10033cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson "primary vbase offset already exists!"); 10043cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson VBases.insert(std::make_pair(Info->PrimaryVirtualBaseInfo->Class, 1005a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson Offset)); 10063cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 10073cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // Traverse the primary virtual base. 10083cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Info->PrimaryVirtualBaseInfo, Offset); 10093cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson } 101097913576dbe624971bf18726899983d211d742c0Anders Carlsson } 101197913576dbe624971bf18726899983d211d742c0Anders Carlsson 10123cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // Now go through all direct non-virtual bases. 10133cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Info->Class); 10143cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson for (unsigned I = 0, E = Info->Bases.size(); I != E; ++I) { 10153cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson const BaseSubobjectInfo *Base = Info->Bases[I]; 10163cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (Base->IsVirtual) 101797913576dbe624971bf18726899983d211d742c0Anders Carlsson continue; 10180aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 10196a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base->Class); 10203cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Base, BaseOffset); 102197913576dbe624971bf18726899983d211d742c0Anders Carlsson } 102297913576dbe624971bf18726899983d211d742c0Anders Carlsson} 102397913576dbe624971bf18726899983d211d742c0Anders Carlsson 102497913576dbe624971bf18726899983d211d742c0Anders Carlssonvoid 10257d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::LayoutVirtualBases(const CXXRecordDecl *RD, 102697913576dbe624971bf18726899983d211d742c0Anders Carlsson const CXXRecordDecl *MostDerivedClass) { 102788f4296e85d49e4ea63cda729cd5f696824c67ceAnders Carlsson const CXXRecordDecl *PrimaryBase; 1028bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson bool PrimaryBaseIsVirtual; 102937147ea14f39a8522e32e3ba4d043a2a33fff90cAnders Carlsson 1030bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson if (MostDerivedClass == RD) { 103128fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = this->PrimaryBase; 103228fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = this->PrimaryBaseIsVirtual; 1033bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson } else { 10340f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 103588f4296e85d49e4ea63cda729cd5f696824c67ceAnders Carlsson PrimaryBase = Layout.getPrimaryBase(); 1036c9e814ba193f38a7b08268612248f63beb279bb3Anders Carlsson PrimaryBaseIsVirtual = Layout.isPrimaryBaseVirtual(); 1037bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson } 1038bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson 1039622e2477d0698d734671523389277e10d8566e26Anders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 1040622e2477d0698d734671523389277e10d8566e26Anders Carlsson E = RD->bases_end(); I != E; ++I) { 1041622e2477d0698d734671523389277e10d8566e26Anders Carlsson assert(!I->getType()->isDependentType() && 10429994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl "Cannot layout class with dependent bases."); 1043bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1044276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson const CXXRecordDecl *BaseDecl = 1045622e2477d0698d734671523389277e10d8566e26Anders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1046622e2477d0698d734671523389277e10d8566e26Anders Carlsson 1047622e2477d0698d734671523389277e10d8566e26Anders Carlsson if (I->isVirtual()) { 1048276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson if (PrimaryBase != BaseDecl || !PrimaryBaseIsVirtual) { 1049276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson bool IndirectPrimaryBase = IndirectPrimaryBases.count(BaseDecl); 1050bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson 1051bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson // Only lay out the virtual base if it's not an indirect primary base. 1052bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson if (!IndirectPrimaryBase) { 1053bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson // Only visit virtual bases once. 1054276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson if (!VisitedVirtualBases.insert(BaseDecl)) 1055bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson continue; 10560aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1057276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson const BaseSubobjectInfo *BaseInfo = VirtualBaseInfo.lookup(BaseDecl); 1058276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson assert(BaseInfo && "Did not find virtual base info!"); 1059276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson LayoutVirtualBase(BaseInfo); 1060147b5ddc6c8618a9d70a83f90de409e444ae705bAnders Carlsson } 1061968db3364611a475909b5e76969d2f5472e65597Mike Stump } 1062fe3010d09cec5cd06e31a3d57fe188a04d9bfa17Mike Stump } 1063bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1064276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson if (!BaseDecl->getNumVBases()) { 1065622e2477d0698d734671523389277e10d8566e26Anders Carlsson // This base isn't interesting since it doesn't have any virtual bases. 1066622e2477d0698d734671523389277e10d8566e26Anders Carlsson continue; 1067622e2477d0698d734671523389277e10d8566e26Anders Carlsson } 1068622e2477d0698d734671523389277e10d8566e26Anders Carlsson 1069276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson LayoutVirtualBases(BaseDecl, MostDerivedClass); 1070eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump } 1071eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump} 1072eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump 1073276b491b44b473d91610432aa335927b2c7ad152Anders Carlssonvoid RecordLayoutBuilder::LayoutVirtualBase(const BaseSubobjectInfo *Base) { 10743cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson assert(!Base->Derived && "Trying to lay out a primary virtual base!"); 10753cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 1076e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Layout the base. 1077a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset = LayoutBase(Base); 1078e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson 1079e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Add its base class offset. 1080276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson assert(!VBases.count(Base->Class) && "vbase offset already exists!"); 1081a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson VBases.insert(std::make_pair(Base->Class, Offset)); 10823cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 10833cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Base, Offset); 1084e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 1085e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1086a2311513524ecef954d2b438bfbe09aa9511b660Anders CarlssonCharUnits RecordLayoutBuilder::LayoutBase(const BaseSubobjectInfo *Base) { 1087b1d880b15f6b254349bd7a700e6b4f2ec1c24f5bAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Base->Class); 1088e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1089e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // If we have an empty base class, try to place it at offset 0. 1090b1d880b15f6b254349bd7a700e6b4f2ec1c24f5bAnders Carlsson if (Base->Class->isEmpty() && 1091a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson EmptySubobjects->CanPlaceBaseAtOffset(Base, CharUnits::Zero())) { 1092dd76a9ab9ea675671200f94b18ce95766841952bKen Dyck uint64_t RecordSizeInBits = Context.toBits(Layout.getSize()); 1093dd76a9ab9ea675671200f94b18ce95766841952bKen Dyck Size = std::max(Size, RecordSizeInBits); 1094e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1095a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson return CharUnits::Zero(); 1096e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson } 1097bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 10983263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck CharUnits UnpackedBaseAlign = Layout.getNonVirtualAlign(); 10993263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck CharUnits BaseAlign = (Packed) ? CharUnits::One() : UnpackedBaseAlign; 110043ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis 110143ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis // The maximum field alignment overrides base align. 1102834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck if (!MaxFieldAlignment.isZero()) { 11033263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck BaseAlign = std::min(BaseAlign, MaxFieldAlignment); 11043263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck UnpackedBaseAlign = std::min(UnpackedBaseAlign, MaxFieldAlignment); 110543ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis } 1106bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1107e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Round up the current record size to the base's alignment boundary. 11083263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck uint64_t Offset = 11093263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck llvm::RoundUpToAlignment(DataSize, Context.toBits(BaseAlign)); 1110bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1111e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Try to place the base. 1112ff3a5174d1f6e7dc98de348aecfdfe1d2fb7cd53Ken Dyck while (!EmptySubobjects->CanPlaceBaseAtOffset(Base, 1113ff3a5174d1f6e7dc98de348aecfdfe1d2fb7cd53Ken Dyck Context.toCharUnitsFromBits(Offset))) 11143263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck Offset += Context.toBits(BaseAlign); 1115e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1116b1d880b15f6b254349bd7a700e6b4f2ec1c24f5bAnders Carlsson if (!Base->Class->isEmpty()) { 1117e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Update the data size. 1118dd76a9ab9ea675671200f94b18ce95766841952bKen Dyck DataSize = Offset + Context.toBits(Layout.getNonVirtualSize()); 1119e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1120e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson Size = std::max(Size, DataSize); 1121e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson } else 1122dd76a9ab9ea675671200f94b18ce95766841952bKen Dyck Size = std::max(Size, Offset + Context.toBits(Layout.getSize())); 1123e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1124e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Remember max struct/class alignment. 112543ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis UpdateAlignment(BaseAlign, UnpackedBaseAlign); 1126e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1127ff3a5174d1f6e7dc98de348aecfdfe1d2fb7cd53Ken Dyck return Context.toCharUnitsFromBits(Offset); 1128e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 1129e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1130c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbarvoid RecordLayoutBuilder::InitializeLayout(const Decl *D) { 1131c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (const RecordDecl *RD = dyn_cast<RecordDecl>(D)) 1132c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar IsUnion = RD->isUnion(); 11330aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1134a5dd722bdf2f74a1a249fe6661d96a7236aee0f0Anders Carlsson Packed = D->hasAttr<PackedAttr>(); 11350aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1136c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // mac68k alignment supersedes maximum field alignment and attribute aligned, 1137c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // and forces all structures to have 2-byte alignment. The IBM docs on it 1138c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // allude to additional (more complicated) semantics, especially with regard 1139c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // to bit-fields, but gcc appears not to follow that. 1140c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (D->hasAttr<AlignMac68kAttr>()) { 1141c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar IsMac68kAlign = true; 1142834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck MaxFieldAlignment = CharUnits::fromQuantity(2); 1143ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck Alignment = CharUnits::fromQuantity(2); 1144c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar } else { 1145c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (const MaxFieldAlignmentAttr *MFAA = D->getAttr<MaxFieldAlignmentAttr>()) 1146834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck MaxFieldAlignment = Context.toCharUnitsFromBits(MFAA->getAlignment()); 11470aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1148cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt if (unsigned MaxAlign = D->getMaxAlignment()) 11493263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck UpdateAlignment(Context.toCharUnitsFromBits(MaxAlign)); 1150c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar } 1151c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson} 115274cbe226207fd101623638dadfa7fbada04ff2a6Anders Carlsson 1153c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlssonvoid RecordLayoutBuilder::Layout(const RecordDecl *D) { 1154c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson InitializeLayout(D); 1155a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson LayoutFields(D); 11561eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1157c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Finally, round the size of the total struct up to the alignment of the 1158c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // struct itself. 115978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FinishLayout(D); 1160c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson} 1161c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1162c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlssonvoid RecordLayoutBuilder::Layout(const CXXRecordDecl *RD) { 1163c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson InitializeLayout(RD); 1164c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1165c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Lay out the vtable and the non-virtual bases. 1166c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson LayoutNonVirtualBases(RD); 1167c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1168c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson LayoutFields(RD); 1169c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1170a1fdb0bc09aa0d17841cdbdd8c52cd1368251cbfKen Dyck NonVirtualSize = Context.toCharUnitsFromBits(Size); 1171ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck NonVirtualAlignment = Alignment; 11723dee6efcad9ad56d14f7edd1c29924f0b876a7f9Mike Stump 1173c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Lay out the virtual bases and add the primary virtual base offsets. 1174c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson LayoutVirtualBases(RD, RD); 117597913576dbe624971bf18726899983d211d742c0Anders Carlsson 1176c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson VisitedVirtualBases.clear(); 1177eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump 1178bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Finally, round the size of the total struct up to the alignment of the 1179bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // struct itself. 118078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FinishLayout(RD); 1181c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1182a1e87162d36f94d3dc58ff3f0743d6026635a0c6Anders Carlsson#ifndef NDEBUG 1183c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Check that we have base offsets for all bases. 1184c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 1185c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson E = RD->bases_end(); I != E; ++I) { 1186c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson if (I->isVirtual()) 1187c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson continue; 11880aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1189c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson const CXXRecordDecl *BaseDecl = 1190c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1191c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1192c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson assert(Bases.count(BaseDecl) && "Did not find base offset!"); 1193c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson } 11940aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1195c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // And all virtual bases. 1196c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 1197c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson E = RD->vbases_end(); I != E; ++I) { 1198c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson const CXXRecordDecl *BaseDecl = 1199c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 12000aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1201c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson assert(VBases.count(BaseDecl) && "Did not find base offset!"); 1202a1e87162d36f94d3dc58ff3f0743d6026635a0c6Anders Carlsson } 1203a1e87162d36f94d3dc58ff3f0743d6026635a0c6Anders Carlsson#endif 1204bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 1205bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 12067d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::Layout(const ObjCInterfaceDecl *D) { 120793fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 12080f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson const ASTRecordLayout &SL = Context.getASTObjCInterfaceLayout(SD); 120993fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson 12103263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck UpdateAlignment(SL.getAlignment()); 12111eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 121293fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // We start laying out ivars not at the end of the superclass 121393fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // structure, but at the next byte following the last field. 1214ec2990351335f163601b98e39b52425e2e9f931eKen Dyck Size = Context.toBits(SL.getDataSize()); 1215a223935e5cf82e939e1ca1da4111d63025a04e39Anders Carlsson DataSize = Size; 121693fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson } 12171eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1218c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar InitializeLayout(D); 12198a2c92cab213bd7e28ff669577e815cd70bafbe3Daniel Dunbar 122093fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // Layout each ivar sequentially. 122193fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 12220f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson Context.ShallowCollectObjCIvars(D, Ivars); 122393fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson for (unsigned i = 0, e = Ivars.size(); i != e; ++i) 122493fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson LayoutField(Ivars[i]); 12251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 122693fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // Finally, round the size of the total struct up to the alignment of the 122793fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // struct itself. 122878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FinishLayout(D); 122993fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson} 123093fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson 12317d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::LayoutFields(const RecordDecl *D) { 1232a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson // Layout each field, for now, just sequentially, respecting alignment. In 1233a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson // the future, this will need to be tweakable by targets. 12341eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (RecordDecl::field_iterator Field = D->field_begin(), 1235bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar FieldEnd = D->field_end(); Field != FieldEnd; ++Field) 1236a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson LayoutField(*Field); 1237a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson} 1238a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson 12390aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbarvoid RecordLayoutBuilder::LayoutWideBitField(uint64_t FieldSize, 124078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t TypeSize, 124178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool FieldPacked, 124278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis const FieldDecl *D) { 12434cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson assert(Context.getLangOptions().CPlusPlus && 12444cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson "Can only have wide bit-fields in C++!"); 12450aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12464cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Itanium C++ ABI 2.4: 12470aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar // If sizeof(T)*8 < n, let T' be the largest integral POD type with 12484cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // sizeof(T')*8 <= n. 12490aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12504cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson QualType IntegralPODTypes[] = { 12510aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar Context.UnsignedCharTy, Context.UnsignedShortTy, Context.UnsignedIntTy, 12524cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson Context.UnsignedLongTy, Context.UnsignedLongLongTy 12534cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson }; 12544cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12554cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson QualType Type; 12564cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson for (unsigned I = 0, E = llvm::array_lengthof(IntegralPODTypes); 12574cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson I != E; ++I) { 12584cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson uint64_t Size = Context.getTypeSize(IntegralPODTypes[I]); 12594cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12604cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson if (Size > FieldSize) 12614cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson break; 12624cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12634cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson Type = IntegralPODTypes[I]; 12644cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } 12654cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson assert(!Type.isNull() && "Did not find a type!"); 12660aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12674cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson unsigned TypeAlign = Context.getTypeAlign(Type); 12684cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12694cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // We're not going to use any of the unfilled bits in the last byte. 12704cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson UnfilledBitsInLastByte = 0; 12714cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 1272de9f153b2348f590151504888c22cb937134cd27Anders Carlsson uint64_t FieldOffset; 127378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedFieldOffset = DataSize - UnfilledBitsInLastByte; 12740aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12754cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson if (IsUnion) { 12764cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson DataSize = std::max(DataSize, FieldSize); 1277de9f153b2348f590151504888c22cb937134cd27Anders Carlsson FieldOffset = 0; 12784cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } else { 1279de9f153b2348f590151504888c22cb937134cd27Anders Carlsson // The bitfield is allocated starting at the next offset aligned appropriately 12800aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar // for T', with length n bits. 1281de9f153b2348f590151504888c22cb937134cd27Anders Carlsson FieldOffset = llvm::RoundUpToAlignment(DataSize, TypeAlign); 12820aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12834cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson uint64_t NewSizeInBits = FieldOffset + FieldSize; 12840aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12854cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson DataSize = llvm::RoundUpToAlignment(NewSizeInBits, 8); 12864cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson UnfilledBitsInLastByte = DataSize - NewSizeInBits; 12874cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } 12884cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12894cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Place this field at the current location. 12904cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson FieldOffsets.push_back(FieldOffset); 12914cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 129278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis CheckFieldPadding(FieldOffset, UnpaddedFieldOffset, FieldOffset, 129378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis TypeAlign, FieldPacked, D); 129478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 12954cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Update the size. 12964cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson Size = std::max(Size, DataSize); 12970aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12984cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Remember max struct/class alignment. 12993263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck UpdateAlignment(Context.toCharUnitsFromBits(TypeAlign)); 13004cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson} 13014cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 13027d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::LayoutBitField(const FieldDecl *D) { 130342dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson bool FieldPacked = Packed || D->hasAttr<PackedAttr>(); 130478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedFieldOffset = DataSize - UnfilledBitsInLastByte; 130578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t FieldOffset = IsUnion ? 0 : UnpaddedFieldOffset; 13060f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson uint64_t FieldSize = D->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 1307bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 13080f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson std::pair<uint64_t, unsigned> FieldInfo = Context.getTypeInfo(D->getType()); 130942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson uint64_t TypeSize = FieldInfo.first; 131042dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson unsigned FieldAlign = FieldInfo.second; 1311bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 13124cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson if (FieldSize > TypeSize) { 131378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis LayoutWideBitField(FieldSize, TypeSize, FieldPacked, D); 13144cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson return; 13154cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } 13164cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 131778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // The align if the field is not packed. This is to check if the attribute 131878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // was unnecessary (-Wpacked). 131978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned UnpackedFieldAlign = FieldAlign; 132078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedFieldOffset = FieldOffset; 132178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (!Context.Target.useBitFieldTypeAlignment()) 132278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign = 1; 132378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 13240f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson if (FieldPacked || !Context.Target.useBitFieldTypeAlignment()) 132542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldAlign = 1; 1326cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt FieldAlign = std::max(FieldAlign, D->getMaxAlignment()); 132778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign = std::max(UnpackedFieldAlign, D->getMaxAlignment()); 13281eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 132942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // The maximum field alignment overrides the aligned attribute. 1330834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck if (!MaxFieldAlignment.isZero()) { 1331834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck unsigned MaxFieldAlignmentInBits = Context.toBits(MaxFieldAlignment); 1332834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck FieldAlign = std::min(FieldAlign, MaxFieldAlignmentInBits); 1333834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck UnpackedFieldAlign = std::min(UnpackedFieldAlign, MaxFieldAlignmentInBits); 133478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 1335bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1336b6a169395c1b30c76daffebcbd2164b6247a5d21Daniel Dunbar // Check if we need to add padding to give the field the correct alignment. 133742dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 133884b0316f720bd089d87acb21ec0002b2da33e6c9Daniel Dunbar FieldOffset = llvm::RoundUpToAlignment(FieldOffset, FieldAlign); 1339bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 134078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (FieldSize == 0 || 134178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis (UnpackedFieldOffset & (UnpackedFieldAlign-1)) + FieldSize > TypeSize) 134278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldOffset = llvm::RoundUpToAlignment(UnpackedFieldOffset, 134378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign); 134478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1345b6a169395c1b30c76daffebcbd2164b6247a5d21Daniel Dunbar // Padding members don't affect overall alignment. 134642dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (!D->getIdentifier()) 134778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FieldAlign = UnpackedFieldAlign = 1; 1348bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 134942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Place this field at the current location. 135042dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldOffsets.push_back(FieldOffset); 1351bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 135278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis CheckFieldPadding(FieldOffset, UnpaddedFieldOffset, UnpackedFieldOffset, 135378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign, FieldPacked, D); 135478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1355e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // Update DataSize to include the last byte containing (part of) the bitfield. 1356e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson if (IsUnion) { 1357e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // FIXME: I think FieldSize should be TypeSize here. 1358e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson DataSize = std::max(DataSize, FieldSize); 1359e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson } else { 1360e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson uint64_t NewSizeInBits = FieldOffset + FieldSize; 1361bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1362e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson DataSize = llvm::RoundUpToAlignment(NewSizeInBits, 8); 1363e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson UnfilledBitsInLastByte = DataSize - NewSizeInBits; 1364e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson } 1365bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1366e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // Update the size. 1367e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson Size = std::max(Size, DataSize); 1368bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 136942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Remember max struct/class alignment. 13703263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck UpdateAlignment(Context.toCharUnitsFromBits(FieldAlign), 13713263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck Context.toCharUnitsFromBits(UnpackedFieldAlign)); 137242dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson} 13731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13747d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::LayoutField(const FieldDecl *D) { 137542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (D->isBitField()) { 137642dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson LayoutBitField(D); 137742dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson return; 137842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } 13791eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 138078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedFieldOffset = DataSize - UnfilledBitsInLastByte; 138178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1382e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // Reset the unfilled bits. 1383e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson UnfilledBitsInLastByte = 0; 1384e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson 138542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson bool FieldPacked = Packed || D->hasAttr<PackedAttr>(); 13869ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CharUnits FieldOffset = 13879ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck IsUnion ? CharUnits::Zero() : Context.toCharUnitsFromBits(DataSize); 13889ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CharUnits FieldSize; 13899ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CharUnits FieldAlign; 1390bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 139142dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (D->getType()->isIncompleteArrayType()) { 139242dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // This is a flexible array member; we can't directly 139342dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // query getTypeInfo about these, so we figure it out here. 139442dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Flexible array members don't have any size, but they 139542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // have to be aligned appropriately for their element type. 13969ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldSize = CharUnits::Zero(); 13970f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson const ArrayType* ATy = Context.getAsArrayType(D->getType()); 13989ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldAlign = Context.getTypeAlignInChars(ATy->getElementType()); 139942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } else if (const ReferenceType *RT = D->getType()->getAs<ReferenceType>()) { 140042dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson unsigned AS = RT->getPointeeType().getAddressSpace(); 14019ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldSize = 14029ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Context.toCharUnitsFromBits(Context.Target.getPointerWidth(AS)); 14039ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldAlign = 14049ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Context.toCharUnitsFromBits(Context.Target.getPointerAlign(AS)); 140542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } else { 14069ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck std::pair<CharUnits, CharUnits> FieldInfo = 14079ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Context.getTypeInfoInChars(D->getType()); 140842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldSize = FieldInfo.first; 1409bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson FieldAlign = FieldInfo.second; 14106f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor 14116f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor if (Context.getLangOptions().MSBitfields) { 14126f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor // If MS bitfield layout is required, figure out what type is being 14136f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor // laid out and align the field to the width of that type. 14146f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor 14156f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor // Resolve all typedefs down to their base type and round up the field 14166f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor // alignment if necessary. 14176f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor QualType T = Context.getBaseElementType(D->getType()); 14186f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor if (const BuiltinType *BTy = T->getAs<BuiltinType>()) { 14199ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CharUnits TypeSize = Context.getTypeSizeInChars(BTy); 14206f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor if (TypeSize > FieldAlign) 14216f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor FieldAlign = TypeSize; 14226f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor } 14236f75550e40a9177db9979fc130ce3ece026b137dDouglas Gregor } 142442dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } 14251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 142678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // The align if the field is not packed. This is to check if the attribute 142778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // was unnecessary (-Wpacked). 14289ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CharUnits UnpackedFieldAlign = FieldAlign; 14299ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CharUnits UnpackedFieldOffset = FieldOffset; 143078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 143142dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (FieldPacked) 14329ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldAlign = CharUnits::One(); 14339ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CharUnits MaxAlignmentInChars = 14349ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Context.toCharUnitsFromBits(D->getMaxAlignment()); 14359ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldAlign = std::max(FieldAlign, MaxAlignmentInChars); 14369ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck UnpackedFieldAlign = std::max(UnpackedFieldAlign, MaxAlignmentInChars); 14371eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 143842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // The maximum field alignment overrides the aligned attribute. 1439834945c19cfb87fc21dfb6980a0980618655d79dKen Dyck if (!MaxFieldAlignment.isZero()) { 14409ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldAlign = std::min(FieldAlign, MaxFieldAlignment); 14419ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck UnpackedFieldAlign = std::min(UnpackedFieldAlign, MaxFieldAlignment); 144278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 14431eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 144442dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Round up the current record size to the field's alignment boundary. 14459ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldOffset = FieldOffset.RoundUpToAlignment(FieldAlign); 14469ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck UnpackedFieldOffset = 14479ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck UnpackedFieldOffset.RoundUpToAlignment(UnpackedFieldAlign); 1448bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 144983a45e7dab892e9efd3515eca4eb5b81bc3f2126Anders Carlsson if (!IsUnion && EmptySubobjects) { 145083a45e7dab892e9efd3515eca4eb5b81bc3f2126Anders Carlsson // Check if we can place the field at this offset. 14519ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck while (!EmptySubobjects->CanPlaceFieldAtOffset(D, FieldOffset)) { 145242dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // We couldn't place the field at the offset. Try again at a new offset. 145342dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldOffset += FieldAlign; 14546026504302763f74102592602b392cecd5ced3aeAnders Carlsson } 1455bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson } 1456bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1457bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Place this field at the current location. 14589ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck FieldOffsets.push_back(Context.toBits(FieldOffset)); 14591eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 14609ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck CheckFieldPadding(Context.toBits(FieldOffset), UnpaddedFieldOffset, 14619ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Context.toBits(UnpackedFieldOffset), 14629ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Context.toBits(UnpackedFieldAlign), FieldPacked, D); 146378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1464bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Reserve space for this field. 14659ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck uint64_t FieldSizeInBits = Context.toBits(FieldSize); 1466bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson if (IsUnion) 14679ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Size = std::max(Size, FieldSizeInBits); 1468bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson else 14699ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck Size = Context.toBits(FieldOffset) + FieldSizeInBits; 14701eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1471a223935e5cf82e939e1ca1da4111d63025a04e39Anders Carlsson // Update the data size. 1472a223935e5cf82e939e1ca1da4111d63025a04e39Anders Carlsson DataSize = Size; 14731eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1474bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Remember max struct/class alignment. 14759ed9a250180f19b2c44df83a196fc3a2ac82f817Ken Dyck UpdateAlignment(FieldAlign, UnpackedFieldAlign); 1476bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 1477bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 147878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidisvoid RecordLayoutBuilder::FinishLayout(const NamedDecl *D) { 1479bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // In C++, records cannot be of size 0. 1480adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian if (Context.getLangOptions().CPlusPlus && Size == 0) { 1481adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) { 1482adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian // Compatibility with gcc requires a class (pod or non-pod) 1483adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian // which is not empty but of size 0; such as having fields of 1484adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian // array of zero-length, remains of Size 0 1485adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian if (RD->isEmpty()) 1486adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian Size = 8; 1487adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian } 1488adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian else 1489adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian Size = 8; 1490adf082e829eb71871b6043009888df3b79055dbaFariborz Jahanian } 1491bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Finally, round the size of the record up to the alignment of the 1492bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // record itself. 149378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedSize = Size - UnfilledBitsInLastByte; 14946feb4bb3defce7e5efc05a69c6bd7dfc9c59fa45Ken Dyck uint64_t UnpackedSize = 14956feb4bb3defce7e5efc05a69c6bd7dfc9c59fa45Ken Dyck llvm::RoundUpToAlignment(Size, Context.toBits(UnpackedAlignment)); 1496ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck Size = llvm::RoundUpToAlignment(Size, Context.toBits(Alignment)); 149778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 149878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned CharBitNum = Context.Target.getCharWidth(); 149978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (const RecordDecl *RD = dyn_cast<RecordDecl>(D)) { 150078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if padding was introduced to the struct/class/union. 150178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (Size > UnpaddedSize) { 150278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned PadSize = Size - UnpaddedSize; 150378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool InBits = true; 150478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (PadSize % CharBitNum == 0) { 150578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis PadSize = PadSize / CharBitNum; 150678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis InBits = false; 150778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 150878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(RD->getLocation(), diag::warn_padded_struct_size) 150978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(RD) 151078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << PadSize 151178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (InBits ? 1 : 0) /*(byte|bit)*/ << (PadSize > 1); // plural or not 151278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 151378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 151478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if we packed it unnecessarily. If the alignment is 1 byte don't 151578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // bother since there won't be alignment issues. 15166feb4bb3defce7e5efc05a69c6bd7dfc9c59fa45Ken Dyck if (Packed && UnpackedAlignment > CharUnits::One() && Size == UnpackedSize) 151778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_unnecessary_packed) 151878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(RD); 151978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 1520bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 1521bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 15223263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyckvoid RecordLayoutBuilder::UpdateAlignment(CharUnits NewAlignment, 15233263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck CharUnits UnpackedNewAlignment) { 1524c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // The alignment is not modified when using 'mac68k' alignment. 1525c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (IsMac68kAlign) 1526c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar return; 1527c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar 15283263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck if (NewAlignment > Alignment) { 15293263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck assert(llvm::isPowerOf2_32(NewAlignment.getQuantity() && 15303263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck "Alignment not a power of 2")); 15313263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck Alignment = NewAlignment; 153278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 153378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 15343263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck if (UnpackedNewAlignment > UnpackedAlignment) { 15353263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck assert(llvm::isPowerOf2_32(UnpackedNewAlignment.getQuantity() && 153678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis "Alignment not a power of 2")); 15373263e09c8e0925edaa541d0d4bb995b4bfb454e7Ken Dyck UnpackedAlignment = UnpackedNewAlignment; 153878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 153978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis} 154078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 154178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidisvoid RecordLayoutBuilder::CheckFieldPadding(uint64_t Offset, 154278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedOffset, 154378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedOffset, 154478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned UnpackedAlign, 154578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool isPacked, 154678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis const FieldDecl *D) { 154778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // We let objc ivars without warning, objc interfaces generally are not used 154878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // for padding tricks. 154978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (isa<ObjCIvarDecl>(D)) 1550bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson return; 15511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 155278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned CharBitNum = Context.Target.getCharWidth(); 15531eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 155478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if padding was introduced to the struct/class. 155578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (!IsUnion && Offset > UnpaddedOffset) { 155678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned PadSize = Offset - UnpaddedOffset; 155778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool InBits = true; 155878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (PadSize % CharBitNum == 0) { 155978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis PadSize = PadSize / CharBitNum; 156078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis InBits = false; 156178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 156278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (D->getIdentifier()) 156378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_padded_struct_field) 156478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (D->getParent()->isStruct() ? 0 : 1) // struct|class 156578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(D->getParent()) 156678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << PadSize 156778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (InBits ? 1 : 0) /*(byte|bit)*/ << (PadSize > 1) // plural or not 156878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << D->getIdentifier(); 156978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis else 157078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_padded_struct_anon_field) 157178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (D->getParent()->isStruct() ? 0 : 1) // struct|class 157278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(D->getParent()) 157378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << PadSize 157478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (InBits ? 1 : 0) /*(byte|bit)*/ << (PadSize > 1); // plural or not 157578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 157678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 157778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if we packed it unnecessarily. If the alignment is 1 byte don't 157878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // bother since there won't be alignment issues. 157978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (isPacked && UnpackedAlign > CharBitNum && Offset == UnpackedOffset) 158078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_unnecessary_packed) 158178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << D->getIdentifier(); 1582bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 15831eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1584f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlssonconst CXXMethodDecl * 15857d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::ComputeKeyFunction(const CXXRecordDecl *RD) { 15868d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar // If a class isn't polymorphic it doesn't have a key function. 1587f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (!RD->isPolymorphic()) 1588f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson return 0; 158961eab8872168af6eb1e0047a82901096cf145e27Eli Friedman 159061eab8872168af6eb1e0047a82901096cf145e27Eli Friedman // A class inside an anonymous namespace doesn't have a key function. (Or 159161eab8872168af6eb1e0047a82901096cf145e27Eli Friedman // at least, there's no point to assigning a key function to such a class; 159261eab8872168af6eb1e0047a82901096cf145e27Eli Friedman // this doesn't affect the ABI.) 159361eab8872168af6eb1e0047a82901096cf145e27Eli Friedman if (RD->isInAnonymousNamespace()) 159461eab8872168af6eb1e0047a82901096cf145e27Eli Friedman return 0; 159561eab8872168af6eb1e0047a82901096cf145e27Eli Friedman 15963bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis // Template instantiations don't have key functions,see Itanium C++ ABI 5.2.6. 15973bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis // Same behavior as GCC. 15983bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis TemplateSpecializationKind TSK = RD->getTemplateSpecializationKind(); 15993bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis if (TSK == TSK_ImplicitInstantiation || 16003bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis TSK == TSK_ExplicitInstantiationDefinition) 16013bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis return 0; 16023bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis 1603bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::method_iterator I = RD->method_begin(), 1604bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->method_end(); I != E; ++I) { 1605f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson const CXXMethodDecl *MD = *I; 1606bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1607f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (!MD->isVirtual()) 1608f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 1609bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1610f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (MD->isPure()) 1611f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 161261eab8872168af6eb1e0047a82901096cf145e27Eli Friedman 1613f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson // Ignore implicit member functions, they are always marked as inline, but 1614f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson // they don't have a body until they're defined. 1615f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (MD->isImplicit()) 1616f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 1617bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1618bd6d6197fcfc98356ea60e816365eb0648b69556Douglas Gregor if (MD->isInlineSpecified()) 1619bd6d6197fcfc98356ea60e816365eb0648b69556Douglas Gregor continue; 1620f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson 1621f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (MD->hasInlineBody()) 1622f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 1623bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1624f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson // We found it. 1625f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson return MD; 1626f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson } 1627bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1628f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson return 0; 1629f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson} 1630f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson 163178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios KyrtzidisDiagnosticBuilder 163278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios KyrtzidisRecordLayoutBuilder::Diag(SourceLocation Loc, unsigned DiagID) { 163333e4e70c8c0a17e0ccb7465d96556b077a68ecb1Argyrios Kyrtzidis return Context.getDiagnostics().Report(Loc, DiagID); 163478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis} 163578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1636cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramernamespace { 1637cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer // This class implements layout specific to the Microsoft ABI. 1638cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer class MSRecordLayoutBuilder : public RecordLayoutBuilder { 1639cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer public: 16404ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad MSRecordLayoutBuilder(const ASTContext& Ctx, 16414ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad EmptySubobjectMap *EmptySubobjects) : 1642cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer RecordLayoutBuilder(Ctx, EmptySubobjects) {} 1643cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer 1644cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer virtual uint64_t GetVirtualPointersSize(const CXXRecordDecl *RD) const; 1645cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer }; 1646cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer} 1647c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 1648c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisuint64_t 1649c9f8aece7e111f90265dfad9a81f3f517be948deCharles DavisMSRecordLayoutBuilder::GetVirtualPointersSize(const CXXRecordDecl *RD) const { 1650c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis // We should reserve space for two pointers if the class has both 1651c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis // virtual functions and virtual bases. 1652c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis if (RD->isPolymorphic() && RD->getNumVBases() > 0) 1653c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis return 2 * Context.Target.getPointerWidth(0); 1654c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis return Context.Target.getPointerWidth(0); 1655c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis} 1656c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 16571e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// getASTRecordLayout - Get or compute information about the layout of the 16581e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// specified record (struct/union/class), which indicates its size and field 16591e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// position information. 16604ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foadconst ASTRecordLayout & 16614ba2a17694148e16eaa8d3917f657ffcd3667be4Jay FoadASTContext::getASTRecordLayout(const RecordDecl *D) const { 16621e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson D = D->getDefinition(); 16631e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson assert(D && "Cannot get layout of forward declarations!"); 16641e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16651e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Look up this layout, if already laid out, return what we have. 16661e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Note that we can't save a reference to the entry because this function 16671e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // is recursive. 16681e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 16691e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (Entry) return *Entry; 16701e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16712f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson const ASTRecordLayout *NewEntry; 16722f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16732f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) { 1674261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson EmptySubobjectMap EmptySubobjects(*this, RD); 167558b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 1676c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis // When compiling for Microsoft, use the special MS builder. 1677cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis llvm::OwningPtr<RecordLayoutBuilder> Builder; 167820cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis switch (Target.getCXXABI()) { 167920cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis default: 1680cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis Builder.reset(new RecordLayoutBuilder(*this, &EmptySubobjects)); 168120cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis break; 168220cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis case CXXABI_Microsoft: 1683cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis Builder.reset(new MSRecordLayoutBuilder(*this, &EmptySubobjects)); 168420cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis } 1685c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->Layout(RD); 16862f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16872f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // FIXME: This is not always correct. See the part about bitfields at 16882f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // http://www.codesourcery.com/public/cxx-abi/abi.html#POD for more info. 16892f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // FIXME: IsPODForThePurposeOfLayout should be stored in the record layout. 16902f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson bool IsPODForThePurposeOfLayout = cast<CXXRecordDecl>(D)->isPOD(); 16912f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16922f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // FIXME: This should be done in FinalizeLayout. 16932f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson uint64_t DataSize = 1694c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis IsPODForThePurposeOfLayout ? Builder->Size : Builder->DataSize; 1695a1fdb0bc09aa0d17841cdbdd8c52cd1368251cbfKen Dyck CharUnits NonVirtualSize = 1696a1fdb0bc09aa0d17841cdbdd8c52cd1368251cbfKen Dyck IsPODForThePurposeOfLayout ? 1697a1fdb0bc09aa0d17841cdbdd8c52cd1368251cbfKen Dyck toCharUnitsFromBits(DataSize) : Builder->NonVirtualSize; 16982f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16995f022d82696c84e4d127c558871d68ac6273274eKen Dyck CharUnits RecordSize = toCharUnitsFromBits(Builder->Size); 17000aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar NewEntry = 1701dac54c124e302d6f028ea5723c425b7f66fc7c71Ken Dyck new (*this) ASTRecordLayout(*this, RecordSize, 1702ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck Builder->Alignment, 1703ec2990351335f163601b98e39b52425e2e9f931eKen Dyck toCharUnitsFromBits(DataSize), 1704ec2990351335f163601b98e39b52425e2e9f931eKen Dyck Builder->FieldOffsets.data(), 1705c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->FieldOffsets.size(), 1706a1fdb0bc09aa0d17841cdbdd8c52cd1368251cbfKen Dyck NonVirtualSize, 1707df205382dae666b011d857402114e4f4acd56c81Ken Dyck Builder->NonVirtualAlignment, 1708261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson EmptySubobjects.SizeOfLargestEmptySubobject, 1709c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->PrimaryBase, 1710c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->PrimaryBaseIsVirtual, 1711c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->Bases, Builder->VBases); 17122f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson } else { 1713261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson RecordLayoutBuilder Builder(*this, /*EmptySubobjects=*/0); 17142f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson Builder.Layout(D); 17150aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 17165f022d82696c84e4d127c558871d68ac6273274eKen Dyck CharUnits RecordSize = toCharUnitsFromBits(Builder.Size); 17175f022d82696c84e4d127c558871d68ac6273274eKen Dyck 17182f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson NewEntry = 1719dac54c124e302d6f028ea5723c425b7f66fc7c71Ken Dyck new (*this) ASTRecordLayout(*this, RecordSize, 1720ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck Builder.Alignment, 1721ec2990351335f163601b98e39b52425e2e9f931eKen Dyck toCharUnitsFromBits(Builder.Size), 17222f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson Builder.FieldOffsets.data(), 17232f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson Builder.FieldOffsets.size()); 17242f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson } 17252f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 17261e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson ASTRecordLayouts[D] = NewEntry; 17271e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17281e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (getLangOptions().DumpRecordLayouts) { 17291e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson llvm::errs() << "\n*** Dumping AST Record Layout\n"; 17301e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson DumpRecordLayout(D, llvm::errs()); 17311e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson } 17321e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17331e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return *NewEntry; 17341e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson} 17351e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17361e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlssonconst CXXMethodDecl *ASTContext::getKeyFunction(const CXXRecordDecl *RD) { 17371e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson RD = cast<CXXRecordDecl>(RD->getDefinition()); 17381e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson assert(RD && "Cannot get key function for forward declarations!"); 17390aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 17401e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson const CXXMethodDecl *&Entry = KeyFunctions[RD]; 17410aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar if (!Entry) 17427d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlsson Entry = RecordLayoutBuilder::ComputeKeyFunction(RD); 17430aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 17441e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return Entry; 17451e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson} 17461e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17471e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// getInterfaceLayoutImpl - Get or compute information about the 17481e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// layout of the given interface. 17491e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// 17501e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// \param Impl - If given, also include the layout of the interface's 17511e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// implementation. This may differ by including synthesized ivars. 17521e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlssonconst ASTRecordLayout & 17531e641ce1c169b4b0cac3d7ad6da44b323453049cAnders CarlssonASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 17544ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const ObjCImplementationDecl *Impl) const { 17551e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson assert(!D->isForwardDecl() && "Invalid interface decl!"); 17561e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17571e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Look up this layout, if already laid out, return what we have. 17581e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson ObjCContainerDecl *Key = 17591e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 17601e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 17611e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return *Entry; 17621e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17631e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Add in synthesized ivar count if laying out an implementation. 17641e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (Impl) { 17651e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson unsigned SynthCount = CountNonClassIvars(D); 17661e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // If there aren't any sythesized ivars then reuse the interface 17671e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // entry. Note we can't cache this because we simply free all 17681e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // entries later; however we shouldn't look up implementations 17691e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // frequently. 17701e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (SynthCount == 0) 17711e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return getObjCLayout(D, 0); 17721e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson } 17731e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 1774261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson RecordLayoutBuilder Builder(*this, /*EmptySubobjects=*/0); 177536cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson Builder.Layout(D); 177636cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson 17775f022d82696c84e4d127c558871d68ac6273274eKen Dyck CharUnits RecordSize = toCharUnitsFromBits(Builder.Size); 17785f022d82696c84e4d127c558871d68ac6273274eKen Dyck 17791e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson const ASTRecordLayout *NewEntry = 1780dac54c124e302d6f028ea5723c425b7f66fc7c71Ken Dyck new (*this) ASTRecordLayout(*this, RecordSize, 1781ea7f6c2c53127b875ed432fd1793d48270d8ba6bKen Dyck Builder.Alignment, 1782ec2990351335f163601b98e39b52425e2e9f931eKen Dyck toCharUnitsFromBits(Builder.DataSize), 178336cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson Builder.FieldOffsets.data(), 178436cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson Builder.FieldOffsets.size()); 17850aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 17861e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson ObjCLayouts[Key] = NewEntry; 17871e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17881e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return *NewEntry; 17891e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson} 17901e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 1791bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbarstatic void PrintOffset(llvm::raw_ostream &OS, 17923069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits Offset, unsigned IndentLevel) { 17933069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson OS << llvm::format("%4d | ", Offset.getQuantity()); 1794bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS.indent(IndentLevel * 2); 1795bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar} 1796bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1797bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbarstatic void DumpCXXRecordLayout(llvm::raw_ostream &OS, 17984ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad const CXXRecordDecl *RD, const ASTContext &C, 17993069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits Offset, 1800bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar unsigned IndentLevel, 1801bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const char* Description, 1802bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar bool IncludeVirtualBases) { 18033069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson const ASTRecordLayout &Layout = C.getASTRecordLayout(RD); 1804bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1805bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar PrintOffset(OS, Offset, IndentLevel); 1806cb421fa690da545b58a720abe5f1c49b166dbde7Dan Gohman OS << C.getTypeDeclType(const_cast<CXXRecordDecl *>(RD)).getAsString(); 1807bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (Description) 1808bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << ' ' << Description; 1809bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (RD->isEmpty()) 1810bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << " (empty)"; 1811bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << '\n'; 1812bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1813bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar IndentLevel++; 1814bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 18153069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); 1816bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1817bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Vtable pointer. 1818bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (RD->isDynamicClass() && !PrimaryBase) { 1819bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar PrintOffset(OS, Offset, IndentLevel); 1820900fc6388e803868a34b9483510c345e9b49d7ebBenjamin Kramer OS << '(' << RD << " vtable pointer)\n"; 1821bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1822bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Dump (non-virtual) bases 1823bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 1824bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->bases_end(); I != E; ++I) { 1825bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar assert(!I->getType()->isDependentType() && 1826bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar "Cannot layout class with dependent bases."); 1827bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (I->isVirtual()) 1828bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar continue; 1829bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1830bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const CXXRecordDecl *Base = 1831bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1832bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 18333069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base); 1834bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1835bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar DumpCXXRecordLayout(OS, Base, C, BaseOffset, IndentLevel, 1836bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar Base == PrimaryBase ? "(primary base)" : "(base)", 1837bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar /*IncludeVirtualBases=*/false); 1838bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1839bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1840bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Dump fields. 1841bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar uint64_t FieldNo = 0; 1842bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1843bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->field_end(); I != E; ++I, ++FieldNo) { 1844bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const FieldDecl *Field = *I; 18453069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits FieldOffset = Offset + 1846fb1e3bc29b667f4275e1d5a43d64ec173f4f9a7dKen Dyck C.toCharUnitsFromBits(Layout.getFieldOffset(FieldNo)); 1847bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1848bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1849bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (const CXXRecordDecl *D = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 1850bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar DumpCXXRecordLayout(OS, D, C, FieldOffset, IndentLevel, 18514087f27e5416c799bcb6be072f905be752acb61cDaniel Dunbar Field->getName().data(), 1852bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar /*IncludeVirtualBases=*/true); 1853bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar continue; 1854bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1855bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1856bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1857bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar PrintOffset(OS, FieldOffset, IndentLevel); 1858900fc6388e803868a34b9483510c345e9b49d7ebBenjamin Kramer OS << Field->getType().getAsString() << ' ' << Field << '\n'; 1859bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1860bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1861bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (!IncludeVirtualBases) 1862bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar return; 1863bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1864bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Dump virtual bases. 1865bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 1866bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->vbases_end(); I != E; ++I) { 1867bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar assert(I->isVirtual() && "Found non-virtual class!"); 1868bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const CXXRecordDecl *VBase = 1869bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1870bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 18713069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits VBaseOffset = Offset + Layout.getVBaseClassOffset(VBase); 1872bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar DumpCXXRecordLayout(OS, VBase, C, VBaseOffset, IndentLevel, 1873bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar VBase == PrimaryBase ? 1874bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar "(primary virtual base)" : "(virtual base)", 1875bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar /*IncludeVirtualBases=*/false); 1876bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1877bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 18785f022d82696c84e4d127c558871d68ac6273274eKen Dyck OS << " sizeof=" << Layout.getSize().getQuantity(); 1879ec2990351335f163601b98e39b52425e2e9f931eKen Dyck OS << ", dsize=" << Layout.getDataSize().getQuantity(); 1880dac54c124e302d6f028ea5723c425b7f66fc7c71Ken Dyck OS << ", align=" << Layout.getAlignment().getQuantity() << '\n'; 18815c3633fa57f27b0909ab5767715c4e66b8920165Ken Dyck OS << " nvsize=" << Layout.getNonVirtualSize().getQuantity(); 188268cf1a5a01ba43ed56a8624632fd65e0804430acKen Dyck OS << ", nvalign=" << Layout.getNonVirtualAlign().getQuantity() << '\n'; 1883bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << '\n'; 1884bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar} 18858d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar 18868d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbarvoid ASTContext::DumpRecordLayout(const RecordDecl *RD, 18874ba2a17694148e16eaa8d3917f657ffcd3667be4Jay Foad llvm::raw_ostream &OS) const { 18888d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar const ASTRecordLayout &Info = getASTRecordLayout(RD); 18898d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar 18908d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) 18913069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson return DumpCXXRecordLayout(OS, CXXRD, *this, CharUnits(), 0, 0, 18928d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar /*IncludeVirtualBases=*/true); 18938d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar 18948d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "Type: " << getTypeDeclType(RD).getAsString() << "\n"; 18958d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "Record: "; 18968d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar RD->dump(); 18978d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "\nLayout: "; 18988d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "<ASTRecordLayout\n"; 1899dd76a9ab9ea675671200f94b18ce95766841952bKen Dyck OS << " Size:" << toBits(Info.getSize()) << "\n"; 1900ec2990351335f163601b98e39b52425e2e9f931eKen Dyck OS << " DataSize:" << toBits(Info.getDataSize()) << "\n"; 1901dac54c124e302d6f028ea5723c425b7f66fc7c71Ken Dyck OS << " Alignment:" << toBits(Info.getAlignment()) << "\n"; 19028d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << " FieldOffsets: ["; 19038d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar for (unsigned i = 0, e = Info.getFieldCount(); i != e; ++i) { 19048d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar if (i) OS << ", "; 19058d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << Info.getFieldOffset(i); 19068d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar } 19078d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "]>\n"; 19088d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar} 1909