RecordLayoutBuilder.cpp revision 43ddd9f2027bdd9c36336a342e9c0dd2aa13f836
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 { 606a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson 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 1018c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson return CharUnits::fromQuantity(FieldOffset / CharWidth); 1028c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson } 1038c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson 104a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson // FIXME: Remove this. 105d8da76365f40a0c12c7d802a0da2aaacf4b2cf99Anders Carlsson CharUnits toCharUnits(uint64_t Offset) const { 1068c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson return CharUnits::fromQuantity(Offset / CharWidth); 107d8da76365f40a0c12c7d802a0da2aaacf4b2cf99Anders Carlsson } 108d8da76365f40a0c12c7d802a0da2aaacf4b2cf99Anders Carlsson 109c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisprotected: 110fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson bool CanPlaceSubobjectAtOffset(const CXXRecordDecl *RD, 111fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits Offset) const; 112c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 113c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis bool CanPlaceBaseSubobjectAtOffset(const BaseSubobjectInfo *Info, 114a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset); 115c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 116c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis bool CanPlaceFieldSubobjectAtOffset(const CXXRecordDecl *RD, 117c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis const CXXRecordDecl *Class, 118a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) const; 119c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis bool CanPlaceFieldSubobjectAtOffset(const FieldDecl *FD, 1208c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson CharUnits Offset) const; 121c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 1226a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlssonpublic: 1230c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson /// This holds the size of the largest empty subobject (either a base 1240aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// or a member). Will be zero if the record being built doesn't contain 1250c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson /// any empty classes. 126a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits SizeOfLargestEmptySubobject; 1270aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1286a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson EmptySubobjectMap(ASTContext &Context, const CXXRecordDecl *Class) 129a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson : Context(Context), CharWidth(Context.getCharWidth()), Class(Class) { 130261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson ComputeEmptySubobjectSizes(); 131261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson } 132261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson 133261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson /// CanPlaceBaseAtOffset - Return whether the given base class can be placed 134261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson /// at the given offset. 1350aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// Returns false if placing the record will result in two components 136261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson /// (direct or indirect) of the same type having the same offset. 137c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson bool CanPlaceBaseAtOffset(const BaseSubobjectInfo *Info, 138a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset); 139812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 140812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson /// CanPlaceFieldAtOffset - Return whether a field can be placed at the given 141812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson /// offset. 142a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson bool CanPlaceFieldAtOffset(const FieldDecl *FD, CharUnits Offset); 1436a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson}; 1440c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 1450c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlssonvoid EmptySubobjectMap::ComputeEmptySubobjectSizes() { 1460c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Check the bases. 1470c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = Class->bases_begin(), 1480c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson E = Class->bases_end(); I != E; ++I) { 1490c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const CXXRecordDecl *BaseDecl = 1500c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1510c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 152a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits EmptySize; 1530c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(BaseDecl); 1540c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson if (BaseDecl->isEmpty()) { 1550c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // If the class decl is empty, get its size. 156a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson EmptySize = toCharUnits(Layout.getSize()); 1570c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } else { 1580c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Otherwise, we get the largest empty subobject for the decl. 1590c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson EmptySize = Layout.getSizeOfLargestEmptySubobject(); 1600c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1610aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 162a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (EmptySize > SizeOfLargestEmptySubobject) 163a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson SizeOfLargestEmptySubobject = EmptySize; 1640c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1650aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1660c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Check the fields. 1670c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson for (CXXRecordDecl::field_iterator I = Class->field_begin(), 1680c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson E = Class->field_end(); I != E; ++I) { 1690c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const FieldDecl *FD = *I; 1700aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1710aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar const RecordType *RT = 1720c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson Context.getBaseElementType(FD->getType())->getAs<RecordType>(); 1730aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1740c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // We only care about record types. 1750c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson if (!RT) 1760c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson continue; 1770c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 178a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits EmptySize; 1790c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const CXXRecordDecl *MemberDecl = cast<CXXRecordDecl>(RT->getDecl()); 1800c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(MemberDecl); 1810c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson if (MemberDecl->isEmpty()) { 1820c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // If the class decl is empty, get its size. 183a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson EmptySize = toCharUnits(Layout.getSize()); 1840c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } else { 1850c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson // Otherwise, we get the largest empty subobject for the decl. 1860c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson EmptySize = Layout.getSizeOfLargestEmptySubobject(); 1870c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1880aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 189a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (EmptySize > SizeOfLargestEmptySubobject) 190a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson SizeOfLargestEmptySubobject = EmptySize; 1910c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson } 1920c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson} 1930c54fc91322faaa78422c3aaec261a26e45d7f8cAnders Carlsson 1940aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbarbool 195812a3456b63708a5972f712e9e4b54d3cc436378Anders CarlssonEmptySubobjectMap::CanPlaceSubobjectAtOffset(const CXXRecordDecl *RD, 196fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits Offset) const { 197812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We only need to check empty bases. 198812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RD->isEmpty()) 199812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 200812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 201fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson EmptyClassOffsetsMapTy::const_iterator I = EmptyClassOffsets.find(Offset); 202812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (I == EmptyClassOffsets.end()) 203812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 204812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 205812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ClassVectorTy& Classes = I->second; 206812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (std::find(Classes.begin(), Classes.end(), RD) == Classes.end()) 207812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 208812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 209812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // There is already an empty class of the same type at this offset. 210812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 211812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 212812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 213812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonvoid EmptySubobjectMap::AddSubobjectAtOffset(const CXXRecordDecl *RD, 214fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits Offset) { 215812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We only care about empty bases. 216812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RD->isEmpty()) 217812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return; 218812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 219fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson ClassVectorTy& Classes = EmptyClassOffsets[Offset]; 220812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson assert(std::find(Classes.begin(), Classes.end(), RD) == Classes.end() && 221812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson "Duplicate empty class detected!"); 22245f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 223812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson Classes.push_back(RD); 224c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson 225c8cb462e57ac13518a170fe52b77bb8656234b35Anders Carlsson // Update the empty class offset. 226fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson if (Offset > MaxEmptyClassOffset) 227fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson MaxEmptyClassOffset = Offset; 228812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 229812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 230812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonbool 231a3d4380d6662a373bc78f915947e5bc06e985e91Anders CarlssonEmptySubobjectMap::CanPlaceBaseSubobjectAtOffset(const BaseSubobjectInfo *Info, 232a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 2332177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 2342177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 235a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!AnyEmptySubobjectsBeyondOffset(Offset)) 2362177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 2372177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 238a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceSubobjectAtOffset(Info->Class, Offset)) 239812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 240812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 24158b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson // Traverse all non-virtual bases. 2424137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Info->Class); 24358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson for (unsigned I = 0, E = Info->Bases.size(); I != E; ++I) { 244ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson BaseSubobjectInfo* Base = Info->Bases[I]; 24558b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Base->IsVirtual) 24658b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson continue; 24758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 2486a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base->Class); 24958b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 25058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (!CanPlaceBaseSubobjectAtOffset(Base, BaseOffset)) 25158b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return false; 25258b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 25358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 2546e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (Info->PrimaryVirtualBaseInfo) { 2556e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryVirtualBaseInfo = Info->PrimaryVirtualBaseInfo; 25658b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 25758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Info == PrimaryVirtualBaseInfo->Derived) { 25858b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (!CanPlaceBaseSubobjectAtOffset(PrimaryVirtualBaseInfo, Offset)) 25958b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return false; 26058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 26158b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 26258b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 263812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 264812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 265812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = Info->Class->field_begin(), 266812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = Info->Class->field_end(); I != E; ++I, ++FieldNo) { 267812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 2688c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (FD->isBitField()) 2698c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson continue; 2708c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson 271a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 272812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(FD, FieldOffset)) 273812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 274812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 275812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 27658b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return true; 27758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson} 27858b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 279ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlssonvoid EmptySubobjectMap::UpdateEmptyBaseSubobjects(const BaseSubobjectInfo *Info, 280a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset, 281e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson bool PlacingEmptyBase) { 282e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson if (!PlacingEmptyBase && Offset >= SizeOfLargestEmptySubobject) { 283e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // We know that the only empty subobjects that can conflict with empty 284e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // subobject of non-empty bases, are empty bases that can be placed at 285e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // offset zero. Because of this, we only need to keep track of empty base 286e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // subobjects with offsets less than the size of the largest empty 287e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // subobject for our class. 288e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson return; 289e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson } 290e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson 291a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson AddSubobjectAtOffset(Info->Class, Offset); 2924137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson 29358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson // Traverse all non-virtual bases. 2944137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Info->Class); 29558b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson for (unsigned I = 0, E = Info->Bases.size(); I != E; ++I) { 296ea2f41c584b9741a591e11c83819b31856f5bc18Anders Carlsson BaseSubobjectInfo* Base = Info->Bases[I]; 29758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Base->IsVirtual) 29858b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson continue; 2994137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson 3006a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base->Class); 301e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson UpdateEmptyBaseSubobjects(Base, BaseOffset, PlacingEmptyBase); 30258b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 30358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 3046e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (Info->PrimaryVirtualBaseInfo) { 3056e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryVirtualBaseInfo = Info->PrimaryVirtualBaseInfo; 30658b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 30758b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (Info == PrimaryVirtualBaseInfo->Derived) 308e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson UpdateEmptyBaseSubobjects(PrimaryVirtualBaseInfo, Offset, 309e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson PlacingEmptyBase); 31058b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson } 311812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 312812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 313812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 314812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = Info->Class->field_begin(), 315812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = Info->Class->field_end(); I != E; ++I, ++FieldNo) { 316812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 3178c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (FD->isBitField()) 3188c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson continue; 3194137d517700a1b0f834535545c3f1676f40abcfbAnders Carlsson 320a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 321a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson UpdateEmptyFieldSubobjects(FD, FieldOffset); 322812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 32358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson} 32458b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 3255b1319c78061e76d70cca50fb3343b25928e001bAnders Carlssonbool EmptySubobjectMap::CanPlaceBaseAtOffset(const BaseSubobjectInfo *Info, 326a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 327261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson // If we know this class doesn't have any empty subobjects we don't need to 328261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson // bother checking. 329a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (SizeOfLargestEmptySubobject.isZero()) 330261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson return true; 331261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson 33258b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson if (!CanPlaceBaseSubobjectAtOffset(Info, Offset)) 33358b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson return false; 334812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 335812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We are able to place the base at this offset. Make sure to update the 336812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // empty base subobject map. 337e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson UpdateEmptyBaseSubobjects(Info, Offset, Info->Class->isEmpty()); 338261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson return true; 339261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson} 340261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson 341812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonbool 342812a3456b63708a5972f712e9e4b54d3cc436378Anders CarlssonEmptySubobjectMap::CanPlaceFieldSubobjectAtOffset(const CXXRecordDecl *RD, 343812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *Class, 344a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) const { 3452177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 3462177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 347a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!AnyEmptySubobjectsBeyondOffset(Offset)) 3482177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 3492177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 350a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceSubobjectAtOffset(RD, Offset)) 351812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 352812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 353812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 354812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 355812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all non-virtual bases. 356812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 357812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = RD->bases_end(); I != E; ++I) { 358812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (I->isVirtual()) 359812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson continue; 360812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 361812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *BaseDecl = 362812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 363812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 3646a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(BaseDecl); 365812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(BaseDecl, Class, BaseOffset)) 366812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 367812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 368812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 36945f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson if (RD == Class) { 37045f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson // This is the most derived class, traverse virtual bases as well. 37145f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 37245f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson E = RD->vbases_end(); I != E; ++I) { 37345f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson const CXXRecordDecl *VBaseDecl = 37445f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 37545f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 3763069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits VBaseOffset = Offset + Layout.getVBaseClassOffset(VBaseDecl); 37745f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson if (!CanPlaceFieldSubobjectAtOffset(VBaseDecl, Class, VBaseOffset)) 37845f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson return false; 37945f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 38045f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 38145f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 382812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 383812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 384812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 385812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson I != E; ++I, ++FieldNo) { 386812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 3878c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (FD->isBitField()) 3888c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson continue; 3898c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson 390a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 391812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 392812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(FD, FieldOffset)) 393812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 394812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 395812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 396812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 397812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 398812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 3998c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlssonbool 4008c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders CarlssonEmptySubobjectMap::CanPlaceFieldSubobjectAtOffset(const FieldDecl *FD, 4018c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson CharUnits Offset) const { 4022177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 4032177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 4048c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (!AnyEmptySubobjectsBeyondOffset(Offset)) 4052177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 4062177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 407812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType T = FD->getType(); 408812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const RecordType *RT = T->getAs<RecordType>()) { 409812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 410a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson return CanPlaceFieldSubobjectAtOffset(RD, RD, Offset); 411812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 412812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 413812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // If we have an array type we need to look at every element. 414812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const ConstantArrayType *AT = Context.getAsConstantArrayType(T)) { 415812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType ElemTy = Context.getBaseElementType(AT); 416812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const RecordType *RT = ElemTy->getAs<RecordType>(); 417812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RT) 418812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 419812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 420812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 421812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 422812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 423812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson uint64_t NumElements = Context.getConstantArrayElementCount(AT); 4248c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson CharUnits ElementOffset = Offset; 425812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (uint64_t I = 0; I != NumElements; ++I) { 4262177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // We don't have to keep looking past the maximum offset that's known to 4272177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson // contain an empty class. 4288c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson if (!AnyEmptySubobjectsBeyondOffset(ElementOffset)) 4292177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson return true; 4302177ab7be5256e691a115356fcb8f3eef9c9733fAnders Carlsson 431a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(RD, RD, ElementOffset)) 432812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 433812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 4348c6acc6be0fbd4127d16c1c0e12a9362462e6e0cAnders Carlsson ElementOffset += toCharUnits(Layout.getSize()); 435812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 436812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 437812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 438812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 439812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 440812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 441812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonbool 442a3d4380d6662a373bc78f915947e5bc06e985e91Anders CarlssonEmptySubobjectMap::CanPlaceFieldAtOffset(const FieldDecl *FD, 443a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 444a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson if (!CanPlaceFieldSubobjectAtOffset(FD, Offset)) 445812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return false; 446812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 447812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // We are able to place the member variable at this offset. 448812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Make sure to update the empty base subobject map. 449812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(FD, Offset); 450812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return true; 451812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 452812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 453812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonvoid EmptySubobjectMap::UpdateEmptyFieldSubobjects(const CXXRecordDecl *RD, 454812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *Class, 455a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 4565ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // We know that the only empty subobjects that can conflict with empty 457e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // field subobjects are subobjects of empty bases that can be placed at offset 4585ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // zero. Because of this, we only need to keep track of empty field 4595ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobjects with offsets less than the size of the largest empty 4605ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobject for our class. 4615ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson if (Offset >= SizeOfLargestEmptySubobject) 4625ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson return; 4635ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson 464a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson AddSubobjectAtOffset(RD, Offset); 465812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 466812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 467812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 468812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all non-virtual bases. 469812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 470812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson E = RD->bases_end(); I != E; ++I) { 471812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (I->isVirtual()) 472812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson continue; 473812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 474812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *BaseDecl = 475812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 476812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 4776a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(BaseDecl); 478812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(BaseDecl, Class, BaseOffset); 479812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 480812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 48145f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson if (RD == Class) { 48245f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson // This is the most derived class, traverse virtual bases as well. 48345f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 48445f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson E = RD->vbases_end(); I != E; ++I) { 48545f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson const CXXRecordDecl *VBaseDecl = 48645f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 48745f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 4883069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits VBaseOffset = Offset + Layout.getVBaseClassOffset(VBaseDecl); 48945f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson UpdateEmptyFieldSubobjects(VBaseDecl, Class, VBaseOffset); 49045f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 49145f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson } 49245f5b54d67215639ae6585d12df5133e99180c2bAnders Carlsson 493812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // Traverse all member variables. 494812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson unsigned FieldNo = 0; 495812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (CXXRecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 496812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson I != E; ++I, ++FieldNo) { 497812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const FieldDecl *FD = *I; 498fa84fbad4863e030b149febc88288514efca34b2Anders Carlsson if (FD->isBitField()) 499fa84fbad4863e030b149febc88288514efca34b2Anders Carlsson continue; 500fa84fbad4863e030b149febc88288514efca34b2Anders Carlsson 501a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits FieldOffset = Offset + getFieldOffset(Layout, FieldNo); 502812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 503a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson UpdateEmptyFieldSubobjects(FD, FieldOffset); 504812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 505812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 506812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 507812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlssonvoid EmptySubobjectMap::UpdateEmptyFieldSubobjects(const FieldDecl *FD, 508a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits Offset) { 509812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType T = FD->getType(); 510812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const RecordType *RT = T->getAs<RecordType>()) { 511812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 512812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(RD, RD, Offset); 513812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return; 514812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 515812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 516812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson // If we have an array type we need to update every element. 517812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (const ConstantArrayType *AT = Context.getAsConstantArrayType(T)) { 518812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson QualType ElemTy = Context.getBaseElementType(AT); 519812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const RecordType *RT = ElemTy->getAs<RecordType>(); 520812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson if (!RT) 521812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson return; 522812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 523812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 524812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 525812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 526812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson uint64_t NumElements = Context.getConstantArrayElementCount(AT); 527a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson CharUnits ElementOffset = Offset; 528812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 529812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson for (uint64_t I = 0; I != NumElements; ++I) { 5305ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // We know that the only empty subobjects that can conflict with empty 531e3362bc104f401564a68ef2e0e5fd89f440cf4fcAnders Carlsson // field subobjects are subobjects of empty bases that can be placed at 5325ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // offset zero. Because of this, we only need to keep track of empty field 5335ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobjects with offsets less than the size of the largest empty 5345ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson // subobject for our class. 5355ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson if (ElementOffset >= SizeOfLargestEmptySubobject) 5365ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson return; 5375ccfdd8d215c7bf324a14523c71ed328325c2bc8Anders Carlsson 538812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson UpdateEmptyFieldSubobjects(RD, RD, ElementOffset); 539a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson ElementOffset += toCharUnits(Layout.getSize()); 540812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 541812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson } 542812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson} 543812a3456b63708a5972f712e9e4b54d3cc436378Anders Carlsson 5447d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonclass RecordLayoutBuilder { 545c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisprotected: 5469392fa63e45716e32061d05673fa28909f325b02Anders Carlsson // FIXME: Remove this and make the appropriate fields public. 5479392fa63e45716e32061d05673fa28909f325b02Anders Carlsson friend class clang::ASTContext; 5480aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5499392fa63e45716e32061d05673fa28909f325b02Anders Carlsson ASTContext &Context; 5509392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 5516a91c0328c81fe1be4e5380fb0e586cafee53b26Anders Carlsson EmptySubobjectMap *EmptySubobjects; 5520aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5539392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Size - The current size of the record layout. 5549392fa63e45716e32061d05673fa28909f325b02Anders Carlsson uint64_t Size; 5550aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5569392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Alignment - The current alignment of the record layout. 5579392fa63e45716e32061d05673fa28909f325b02Anders Carlsson unsigned Alignment; 5580aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 55978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis /// \brief The alignment if attribute packed is not used. 56078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned UnpackedAlignment; 56178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 5629392fa63e45716e32061d05673fa28909f325b02Anders Carlsson llvm::SmallVector<uint64_t, 16> FieldOffsets; 5639392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 5649392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Packed - Whether the record is packed or not. 565c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar unsigned Packed : 1; 566c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar 567c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar unsigned IsUnion : 1; 568c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar 569c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar unsigned IsMac68kAlign : 1; 5709392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 5719392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// UnfilledBitsInLastByte - If the last field laid out was a bitfield, 5729392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// this contains the number of bits in the last byte that can be used for 5739392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// an adjacent bitfield if necessary. 5749392fa63e45716e32061d05673fa28909f325b02Anders Carlsson unsigned char UnfilledBitsInLastByte; 5750aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5769392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// MaxFieldAlignment - The maximum allowed field alignment. This is set by 5770aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// #pragma pack. 5789392fa63e45716e32061d05673fa28909f325b02Anders Carlsson unsigned MaxFieldAlignment; 5790aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5809392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// DataSize - The data size of the record being laid out. 5819392fa63e45716e32061d05673fa28909f325b02Anders Carlsson uint64_t DataSize; 5820aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5839392fa63e45716e32061d05673fa28909f325b02Anders Carlsson uint64_t NonVirtualSize; 5849392fa63e45716e32061d05673fa28909f325b02Anders Carlsson unsigned NonVirtualAlignment; 5850aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5869392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// PrimaryBase - the primary base class (if one exists) of the class 5879392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// we're laying out. 5889392fa63e45716e32061d05673fa28909f325b02Anders Carlsson const CXXRecordDecl *PrimaryBase; 5890aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5909392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// PrimaryBaseIsVirtual - Whether the primary base of the class we're laying 5919392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// out is virtual. 5929392fa63e45716e32061d05673fa28909f325b02Anders Carlsson bool PrimaryBaseIsVirtual; 5939392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 594376bda924ac92462a22d6a22ea65d8c1bb8f26f3Anders Carlsson typedef llvm::DenseMap<const CXXRecordDecl *, CharUnits> BaseOffsetsMapTy; 5950aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5969392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// Bases - base classes and their offsets in the record. 5979392fa63e45716e32061d05673fa28909f325b02Anders Carlsson BaseOffsetsMapTy Bases; 5980aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 5999392fa63e45716e32061d05673fa28909f325b02Anders Carlsson // VBases - virtual base classes and their offsets in the record. 6009392fa63e45716e32061d05673fa28909f325b02Anders Carlsson BaseOffsetsMapTy VBases; 6019392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6029392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// IndirectPrimaryBases - Virtual base classes, direct or indirect, that are 6039392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// primary base classes for some other direct or indirect base class. 604245656ec65ec600ef1ab05f4c8d9f780542d689dAnders Carlsson CXXIndirectPrimaryBaseSet IndirectPrimaryBases; 6050aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 6069392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// FirstNearlyEmptyVBase - The first nearly empty virtual base class in 6079392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// inheritance graph order. Used for determining the primary base class. 6089392fa63e45716e32061d05673fa28909f325b02Anders Carlsson const CXXRecordDecl *FirstNearlyEmptyVBase; 6099392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6109392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// VisitedVirtualBases - A set of all the visited virtual bases, used to 6119392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// avoid visiting virtual bases more than once. 6129392fa63e45716e32061d05673fa28909f325b02Anders Carlsson llvm::SmallPtrSet<const CXXRecordDecl *, 4> VisitedVirtualBases; 6130aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 614261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson RecordLayoutBuilder(ASTContext &Context, EmptySubobjectMap *EmptySubobjects) 615261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson : Context(Context), EmptySubobjects(EmptySubobjects), Size(0), Alignment(8), 61678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedAlignment(Alignment), Packed(false), IsUnion(false), 61778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis IsMac68kAlign(false), UnfilledBitsInLastByte(0), MaxFieldAlignment(0), 61878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis DataSize(0), NonVirtualSize(0), NonVirtualAlignment(8), PrimaryBase(0), 619c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar PrimaryBaseIsVirtual(false), FirstNearlyEmptyVBase(0) { } 6200aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 621fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson // FIXME: Remove these. 622fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson CharUnits toCharUnits(uint64_t Offset) const { 623fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson return CharUnits::fromQuantity(Offset / Context.getCharWidth()); 624fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson } 625fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson uint64_t toOffset(CharUnits Offset) const { 626fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson return Offset.getQuantity() * Context.getCharWidth(); 627fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson } 628fe5ef73149514e513a231a1df1a5938f3ad1545aAnders Carlsson 6299392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void Layout(const RecordDecl *D); 630c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson void Layout(const CXXRecordDecl *D); 6319392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void Layout(const ObjCInterfaceDecl *D); 6329392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6339392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutFields(const RecordDecl *D); 6349392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutField(const FieldDecl *D); 63578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void LayoutWideBitField(uint64_t FieldSize, uint64_t TypeSize, 63678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool FieldPacked, const FieldDecl *D); 6379392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutBitField(const FieldDecl *D); 6389392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6396e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// BaseSubobjectInfoAllocator - Allocator for BaseSubobjectInfo objects. 6406e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson llvm::SpecificBumpPtrAllocator<BaseSubobjectInfo> BaseSubobjectInfoAllocator; 6416e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6426e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson typedef llvm::DenseMap<const CXXRecordDecl *, BaseSubobjectInfo *> 6436e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfoMapTy; 6446e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6456e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// VirtualBaseInfo - Map from all the (direct or indirect) virtual bases 6466e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// of the class we're laying out to their base subobject info. 6476e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfoMapTy VirtualBaseInfo; 6486e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6496e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// NonVirtualBaseInfo - Map from all the direct non-virtual bases of the 6506e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// class we're laying out to their base subobject info. 6516e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfoMapTy NonVirtualBaseInfo; 6526e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6536e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// ComputeBaseSubobjectInfo - Compute the base subobject information for the 6546e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// bases of the given class. 6556e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson void ComputeBaseSubobjectInfo(const CXXRecordDecl *RD); 6566e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 6576e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// ComputeBaseSubobjectInfo - Compute the base subobject information for a 6586e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson /// single class and all of its base classes. 6596e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *ComputeBaseSubobjectInfo(const CXXRecordDecl *RD, 6606e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual, 6616e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Derived); 6629392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6639392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// DeterminePrimaryBase - Determine the primary base of the given class. 6649392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void DeterminePrimaryBase(const CXXRecordDecl *RD); 6659392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6669392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void SelectPrimaryVBase(const CXXRecordDecl *RD); 6670aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 668c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis virtual uint64_t GetVirtualPointersSize(const CXXRecordDecl *RD) const; 669c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 6700aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// LayoutNonVirtualBases - Determines the primary base class (if any) and 6719392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// lays it out. Will then proceed to lay out all non-virtual base clasess. 6729392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutNonVirtualBases(const CXXRecordDecl *RD); 6739392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6749392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// LayoutNonVirtualBase - Lays out a single non-virtual base. 67507cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson void LayoutNonVirtualBase(const BaseSubobjectInfo *Base); 6769392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 677a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson void AddPrimaryVirtualBaseOffsets(const BaseSubobjectInfo *Info, 678a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset); 6799392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6809392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// LayoutVirtualBases - Lays out all the virtual bases. 6819392fa63e45716e32061d05673fa28909f325b02Anders Carlsson void LayoutVirtualBases(const CXXRecordDecl *RD, 6829392fa63e45716e32061d05673fa28909f325b02Anders Carlsson const CXXRecordDecl *MostDerivedClass); 6839392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6849392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// LayoutVirtualBase - Lays out a single virtual base. 685276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson void LayoutVirtualBase(const BaseSubobjectInfo *Base); 6869392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 6870aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar /// LayoutBase - Will lay out a base and return the offset where it was 688a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson /// placed, in chars. 689a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits LayoutBase(const BaseSubobjectInfo *Base); 6909392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 691c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson /// InitializeLayout - Initialize record layout for the given record decl. 692c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar void InitializeLayout(const Decl *D); 693c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 6949392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// FinishLayout - Finalize record layout. Adjust record size based on the 6959392fa63e45716e32061d05673fa28909f325b02Anders Carlsson /// alignment. 69678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void FinishLayout(const NamedDecl *D); 69778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 69878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void UpdateAlignment(unsigned NewAlignment, unsigned UnpackedNewAlignment); 69978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void UpdateAlignment(unsigned NewAlignment) { 70078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UpdateAlignment(NewAlignment, NewAlignment); 70178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 70278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 70378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis void CheckFieldPadding(uint64_t Offset, uint64_t UnpaddedOffset, 70478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedOffset, unsigned UnpackedAlign, 70578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool isPacked, const FieldDecl *D); 7069392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 70778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID); 7089392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 709c83d2d7d8914a0fe00d679a262f2bdae7689f16dArgyrios Kyrtzidis RecordLayoutBuilder(const RecordLayoutBuilder&); // DO NOT IMPLEMENT 710c83d2d7d8914a0fe00d679a262f2bdae7689f16dArgyrios Kyrtzidis void operator=(const RecordLayoutBuilder&); // DO NOT IMPLEMENT 7119392fa63e45716e32061d05673fa28909f325b02Anders Carlssonpublic: 7129392fa63e45716e32061d05673fa28909f325b02Anders Carlsson static const CXXMethodDecl *ComputeKeyFunction(const CXXRecordDecl *RD); 713cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis 714cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis virtual ~RecordLayoutBuilder() { } 7159392fa63e45716e32061d05673fa28909f325b02Anders Carlsson}; 7167e220286410422ed1dc0409a9cb9708fe50e3df0Benjamin Kramer} // end anonymous namespace 7179392fa63e45716e32061d05673fa28909f325b02Anders Carlsson 7183f066522342538509cf0aa4f381503b43fbdb68bAnders Carlssonvoid 7197d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::SelectPrimaryVBase(const CXXRecordDecl *RD) { 720584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 721bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->bases_end(); I != E; ++I) { 722584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson assert(!I->getType()->isDependentType() && 7239994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl "Cannot layout class with dependent bases."); 724bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 7251eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump const CXXRecordDecl *Base = 726584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 727200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 728584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // Check if this is a nearly empty virtual base. 729dae0cb52e4e3d46bbfc9a4510909522197a92e54Anders Carlsson if (I->isVirtual() && Context.isNearlyEmpty(Base)) { 730584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // If it's not an indirect primary base, then we've found our primary 731584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // base. 7323f066522342538509cf0aa4f381503b43fbdb68bAnders Carlsson if (!IndirectPrimaryBases.count(Base)) { 73328fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = Base; 73428fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = true; 735d76264e0b20470267249660ab947197cf6d6e31fMike Stump return; 736d76264e0b20470267249660ab947197cf6d6e31fMike Stump } 737bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 738584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson // Is this the first nearly empty virtual base? 739584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson if (!FirstNearlyEmptyVBase) 740584e1dfaf6ab682cebe4fe51f55f0ae3215d303fAnders Carlsson FirstNearlyEmptyVBase = Base; 741d76264e0b20470267249660ab947197cf6d6e31fMike Stump } 742bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 743200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson SelectPrimaryVBase(Base); 74428fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBase) 74594ba380b820cde3fb9d97d5f07ac709ebbb6ac1eZhongxing Xu return; 746d76264e0b20470267249660ab947197cf6d6e31fMike Stump } 747d76264e0b20470267249660ab947197cf6d6e31fMike Stump} 748d76264e0b20470267249660ab947197cf6d6e31fMike Stump 749c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisuint64_t 750c9f8aece7e111f90265dfad9a81f3f517be948deCharles DavisRecordLayoutBuilder::GetVirtualPointersSize(const CXXRecordDecl *RD) const { 751c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis return Context.Target.getPointerWidth(0); 752c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis} 753c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 754200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson/// DeterminePrimaryBase - Determine the primary base of the given class. 7557d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::DeterminePrimaryBase(const CXXRecordDecl *RD) { 756200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // If the class isn't dynamic, it won't have a primary base. 757200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (!RD->isDynamicClass()) 758200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson return; 759bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 7603f066522342538509cf0aa4f381503b43fbdb68bAnders Carlsson // Compute all the primary virtual bases for all of our direct and 7610880e75541899bc1cdd73c50eb549110b5916c59Mike Stump // indirect bases, and record all their primary virtual base classes. 762245656ec65ec600ef1ab05f4c8d9f780542d689dAnders Carlsson RD->getIndirectPrimaryBases(IndirectPrimaryBases); 7630880e75541899bc1cdd73c50eb549110b5916c59Mike Stump 764bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // If the record has a dynamic base class, attempt to choose a primary base 765bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // class. It is the first (in direct base class order) non-virtual dynamic 7663f066522342538509cf0aa4f381503b43fbdb68bAnders Carlsson // base class, if one exists. 7676f376336138ea719e3c4757ae046a5768043b276Mike Stump for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 768bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar e = RD->bases_end(); i != e; ++i) { 769ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson // Ignore virtual bases. 770ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson if (i->isVirtual()) 771ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson continue; 772bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 773ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson const CXXRecordDecl *Base = 774ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 775ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson 776ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson if (Base->isDynamicClass()) { 777ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson // We found it. 77828fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = Base; 77928fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = false; 780ce2009ab2f59894dbcc847e25e05abe78c296e95Anders Carlsson return; 7816f376336138ea719e3c4757ae046a5768043b276Mike Stump } 7826f376336138ea719e3c4757ae046a5768043b276Mike Stump } 7836f376336138ea719e3c4757ae046a5768043b276Mike Stump 7846f376336138ea719e3c4757ae046a5768043b276Mike Stump // Otherwise, it is the first nearly empty virtual base that is not an 78549520944c688a9d5fc78d0c2af544b825873477bMike Stump // indirect primary virtual base class, if one exists. 786200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (RD->getNumVBases() != 0) { 787200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson SelectPrimaryVBase(RD); 78828fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBase) 789200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson return; 790200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson } 7916f376336138ea719e3c4757ae046a5768043b276Mike Stump 792200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Otherwise, it is the first nearly empty virtual base that is not an 793200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // indirect primary virtual base class, if one exists. 794200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (FirstNearlyEmptyVBase) { 79528fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = FirstNearlyEmptyVBase; 79628fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = true; 7976f376336138ea719e3c4757ae046a5768043b276Mike Stump return; 798200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson } 799bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 800200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Otherwise there is no primary base class. 80128fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson assert(!PrimaryBase && "Should not get here with a primary base!"); 802200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 803200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Allocate the virtual table pointer at offset zero. 804200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson assert(DataSize == 0 && "Vtable pointer must be at offset zero!"); 805bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 806200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Update the size. 807c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Size += GetVirtualPointersSize(RD); 808200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson DataSize = Size; 809200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 810200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Update the alignment. 8110f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson UpdateAlignment(Context.Target.getPointerAlign(0)); 8126f376336138ea719e3c4757ae046a5768043b276Mike Stump} 8136f376336138ea719e3c4757ae046a5768043b276Mike Stump 8146e26454ecceb20938b866717dc8a72c6d37d224dAnders CarlssonBaseSubobjectInfo * 8156e26454ecceb20938b866717dc8a72c6d37d224dAnders CarlssonRecordLayoutBuilder::ComputeBaseSubobjectInfo(const CXXRecordDecl *RD, 8166e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual, 8176e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Derived) { 8186e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Info; 8196e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8206e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (IsVirtual) { 8216e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Check if we already have info about this virtual base. 8226e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *&InfoSlot = VirtualBaseInfo[RD]; 8236e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (InfoSlot) { 8246e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(InfoSlot->Class == RD && "Wrong class for virtual base info!"); 8256e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson return InfoSlot; 8266e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8276e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8286e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // We don't, create it. 8296e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson InfoSlot = new (BaseSubobjectInfoAllocator.Allocate()) BaseSubobjectInfo; 8306e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info = InfoSlot; 8316e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } else { 8326e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info = new (BaseSubobjectInfoAllocator.Allocate()) BaseSubobjectInfo; 8336e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8346e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8356e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->Class = RD; 8366e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->IsVirtual = IsVirtual; 8376e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->Derived = 0; 8386e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->PrimaryVirtualBaseInfo = 0; 8396e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8406e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const CXXRecordDecl *PrimaryVirtualBase = 0; 8416e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryVirtualBaseInfo = 0; 8426e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8436e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Check if this base has a primary virtual base. 8446e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (RD->getNumVBases()) { 8456e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 846c9e814ba193f38a7b08268612248f63beb279bb3Anders Carlsson if (Layout.isPrimaryBaseVirtual()) { 8476e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // This base does have a primary virtual base. 8486e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBase = Layout.getPrimaryBase(); 8496e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(PrimaryVirtualBase && "Didn't have a primary virtual base!"); 8506e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8516e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Now check if we have base subobject info about this primary base. 8526e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo = VirtualBaseInfo.lookup(PrimaryVirtualBase); 8536e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8546e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (PrimaryVirtualBaseInfo) { 8556e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (PrimaryVirtualBaseInfo->Derived) { 8566e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // We did have info about this primary base, and it turns out that it 8576e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // has already been claimed as a primary virtual base for another 8586e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // base. 8596e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBase = 0; 8606e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } else { 8616e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // We can claim this base as our primary base. 8626e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->PrimaryVirtualBaseInfo = PrimaryVirtualBaseInfo; 8636e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo->Derived = Info; 8646e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8656e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8666e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8676e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8686e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8696e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Now go through all direct bases. 8706e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 8716e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson E = RD->bases_end(); I != E; ++I) { 8726e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual = I->isVirtual(); 8736e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8746e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const CXXRecordDecl *BaseDecl = 8756e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 8766e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8776e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->Bases.push_back(ComputeBaseSubobjectInfo(BaseDecl, IsVirtual, Info)); 8786e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8796e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8806e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (PrimaryVirtualBase && !PrimaryVirtualBaseInfo) { 8816e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Traversing the bases must have created the base info for our primary 8826e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // virtual base. 8836e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo = VirtualBaseInfo.lookup(PrimaryVirtualBase); 8846e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(PrimaryVirtualBaseInfo && 8856e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson "Did not create a primary virtual base!"); 8866e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8876e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Claim the primary virtual base as our primary virtual base. 8886e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson Info->PrimaryVirtualBaseInfo = PrimaryVirtualBaseInfo; 8896e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryVirtualBaseInfo->Derived = Info; 8906e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 8916e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8926e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson return Info; 8936e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson} 8946e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 8956e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlssonvoid RecordLayoutBuilder::ComputeBaseSubobjectInfo(const CXXRecordDecl *RD) { 8966e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 8976e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson E = RD->bases_end(); I != E; ++I) { 8986e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson bool IsVirtual = I->isVirtual(); 8996e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 9006e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson const CXXRecordDecl *BaseDecl = 9016e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 9026e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 9036e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Compute the base subobject info for this base. 9046e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *Info = ComputeBaseSubobjectInfo(BaseDecl, IsVirtual, 0); 9056e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 9066e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson if (IsVirtual) { 9076e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // ComputeBaseInfo has already added this base for us. 9086e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(VirtualBaseInfo.count(BaseDecl) && 9096e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson "Did not add virtual base!"); 9106e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } else { 9116e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Add the base info to the map of non-virtual bases. 9126e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson assert(!NonVirtualBaseInfo.count(BaseDecl) && 9136e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson "Non-virtual base already exists!"); 9146e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson NonVirtualBaseInfo.insert(std::make_pair(BaseDecl, Info)); 9156e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 9166e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson } 9176e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson} 9186e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 919e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlssonvoid 9207d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::LayoutNonVirtualBases(const CXXRecordDecl *RD) { 9216e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Then, determine the primary base class. 922200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson DeterminePrimaryBase(RD); 923bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 9246e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // Compute base subobject info. 9256e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson ComputeBaseSubobjectInfo(RD); 9266e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 927200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // If we have a primary base class, lay it out. 92828fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBase) { 92928fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson if (PrimaryBaseIsVirtual) { 9306e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // If the primary virtual base was a primary virtual base of some other 9316e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson // base class we'll have to steal it. 9326e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson BaseSubobjectInfo *PrimaryBaseInfo = VirtualBaseInfo.lookup(PrimaryBase); 9336e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson PrimaryBaseInfo->Derived = 0; 9346e26454ecceb20938b866717dc8a72c6d37d224dAnders Carlsson 935200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // We have a virtual primary base, insert it as an indirect primary base. 93628fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson IndirectPrimaryBases.insert(PrimaryBase); 93737147ea14f39a8522e32e3ba4d043a2a33fff90cAnders Carlsson 9380aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar assert(!VisitedVirtualBases.count(PrimaryBase) && 93928fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson "vbase already visited!"); 94028fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson VisitedVirtualBases.insert(PrimaryBase); 9410aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 942276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson LayoutVirtualBase(PrimaryBaseInfo); 94307cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson } else { 94407cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson BaseSubobjectInfo *PrimaryBaseInfo = 94507cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson NonVirtualBaseInfo.lookup(PrimaryBase); 94607cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson assert(PrimaryBaseInfo && 94707cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson "Did not find base info for non-virtual primary base!"); 94807cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson 94907cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson LayoutNonVirtualBase(PrimaryBaseInfo); 95007cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson } 951200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson } 952bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 953200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Now lay out the non-virtual bases. 954200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 955bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->bases_end(); I != E; ++I) { 956200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 957200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Ignore virtual bases. 958200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson if (I->isVirtual()) 959200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson continue; 960200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 96107cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson const CXXRecordDecl *BaseDecl = 962200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 963200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 964200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Skip the primary base. 96507cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson if (BaseDecl == PrimaryBase && !PrimaryBaseIsVirtual) 966200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson continue; 967200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson 968200c5c2d9488165626925235ff918e3d744d785aAnders Carlsson // Lay out the base. 96907cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson BaseSubobjectInfo *BaseInfo = NonVirtualBaseInfo.lookup(BaseDecl); 97007cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson assert(BaseInfo && "Did not find base info for non-virtual base!"); 97107cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson 97207cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson LayoutNonVirtualBase(BaseInfo); 973e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson } 974e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 975e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 97607cebc57123db6a50c7c293e44a9647ce069952bAnders Carlssonvoid RecordLayoutBuilder::LayoutNonVirtualBase(const BaseSubobjectInfo *Base) { 977e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Layout the base. 978a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset = LayoutBase(Base); 979bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 980e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Add its base class offset. 98107cebc57123db6a50c7c293e44a9647ce069952bAnders Carlsson assert(!Bases.count(Base->Class) && "base offset already exists!"); 982a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson Bases.insert(std::make_pair(Base->Class, Offset)); 9833cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 9843cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Base, Offset); 985e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 986968db3364611a475909b5e76969d2f5472e65597Mike Stump 987bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbarvoid 9883cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders CarlssonRecordLayoutBuilder::AddPrimaryVirtualBaseOffsets(const BaseSubobjectInfo *Info, 989a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset) { 9903cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // This base isn't interesting, it has no virtual bases. 9913cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (!Info->Class->getNumVBases()) 9923cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson return; 9933cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 9943cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // First, check if we have a virtual primary base to add offsets for. 9953cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (Info->PrimaryVirtualBaseInfo) { 9963cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson assert(Info->PrimaryVirtualBaseInfo->IsVirtual && 9973cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson "Primary virtual base is not virtual!"); 9983cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (Info->PrimaryVirtualBaseInfo->Derived == Info) { 9993cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // Add the offset. 10003cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson assert(!VBases.count(Info->PrimaryVirtualBaseInfo->Class) && 10013cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson "primary vbase offset already exists!"); 10023cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson VBases.insert(std::make_pair(Info->PrimaryVirtualBaseInfo->Class, 1003a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson Offset)); 10043cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 10053cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // Traverse the primary virtual base. 10063cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Info->PrimaryVirtualBaseInfo, Offset); 10073cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson } 100897913576dbe624971bf18726899983d211d742c0Anders Carlsson } 100997913576dbe624971bf18726899983d211d742c0Anders Carlsson 10103cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson // Now go through all direct non-virtual bases. 10113cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Info->Class); 10123cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson for (unsigned I = 0, E = Info->Bases.size(); I != E; ++I) { 10133cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson const BaseSubobjectInfo *Base = Info->Bases[I]; 10143cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson if (Base->IsVirtual) 101597913576dbe624971bf18726899983d211d742c0Anders Carlsson continue; 10160aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 10176a3567442307864eac52bb84ce41465753513635Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base->Class); 10183cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Base, BaseOffset); 101997913576dbe624971bf18726899983d211d742c0Anders Carlsson } 102097913576dbe624971bf18726899983d211d742c0Anders Carlsson} 102197913576dbe624971bf18726899983d211d742c0Anders Carlsson 102297913576dbe624971bf18726899983d211d742c0Anders Carlssonvoid 10237d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::LayoutVirtualBases(const CXXRecordDecl *RD, 102497913576dbe624971bf18726899983d211d742c0Anders Carlsson const CXXRecordDecl *MostDerivedClass) { 102588f4296e85d49e4ea63cda729cd5f696824c67ceAnders Carlsson const CXXRecordDecl *PrimaryBase; 1026bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson bool PrimaryBaseIsVirtual; 102737147ea14f39a8522e32e3ba4d043a2a33fff90cAnders Carlsson 1028bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson if (MostDerivedClass == RD) { 102928fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBase = this->PrimaryBase; 103028fdd0a8b450c1329b3303e5cf8e8a788a0ef85aAnders Carlsson PrimaryBaseIsVirtual = this->PrimaryBaseIsVirtual; 1031bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson } else { 10320f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(RD); 103388f4296e85d49e4ea63cda729cd5f696824c67ceAnders Carlsson PrimaryBase = Layout.getPrimaryBase(); 1034c9e814ba193f38a7b08268612248f63beb279bb3Anders Carlsson PrimaryBaseIsVirtual = Layout.isPrimaryBaseVirtual(); 1035bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson } 1036bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson 1037622e2477d0698d734671523389277e10d8566e26Anders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 1038622e2477d0698d734671523389277e10d8566e26Anders Carlsson E = RD->bases_end(); I != E; ++I) { 1039622e2477d0698d734671523389277e10d8566e26Anders Carlsson assert(!I->getType()->isDependentType() && 10409994a34f6cf842721ba7723edc0b9036229fe387Sebastian Redl "Cannot layout class with dependent bases."); 1041bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1042276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson const CXXRecordDecl *BaseDecl = 1043622e2477d0698d734671523389277e10d8566e26Anders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1044622e2477d0698d734671523389277e10d8566e26Anders Carlsson 1045622e2477d0698d734671523389277e10d8566e26Anders Carlsson if (I->isVirtual()) { 1046276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson if (PrimaryBase != BaseDecl || !PrimaryBaseIsVirtual) { 1047276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson bool IndirectPrimaryBase = IndirectPrimaryBases.count(BaseDecl); 1048bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson 1049bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson // Only lay out the virtual base if it's not an indirect primary base. 1050bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson if (!IndirectPrimaryBase) { 1051bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson // Only visit virtual bases once. 1052276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson if (!VisitedVirtualBases.insert(BaseDecl)) 1053bdda6c1788dfdb890e1eccd13b949b1cc875eeaaAnders Carlsson continue; 10540aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1055276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson const BaseSubobjectInfo *BaseInfo = VirtualBaseInfo.lookup(BaseDecl); 1056276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson assert(BaseInfo && "Did not find virtual base info!"); 1057276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson LayoutVirtualBase(BaseInfo); 1058147b5ddc6c8618a9d70a83f90de409e444ae705bAnders Carlsson } 1059968db3364611a475909b5e76969d2f5472e65597Mike Stump } 1060fe3010d09cec5cd06e31a3d57fe188a04d9bfa17Mike Stump } 1061bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1062276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson if (!BaseDecl->getNumVBases()) { 1063622e2477d0698d734671523389277e10d8566e26Anders Carlsson // This base isn't interesting since it doesn't have any virtual bases. 1064622e2477d0698d734671523389277e10d8566e26Anders Carlsson continue; 1065622e2477d0698d734671523389277e10d8566e26Anders Carlsson } 1066622e2477d0698d734671523389277e10d8566e26Anders Carlsson 1067276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson LayoutVirtualBases(BaseDecl, MostDerivedClass); 1068eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump } 1069eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump} 1070eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump 1071276b491b44b473d91610432aa335927b2c7ad152Anders Carlssonvoid RecordLayoutBuilder::LayoutVirtualBase(const BaseSubobjectInfo *Base) { 10723cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson assert(!Base->Derived && "Trying to lay out a primary virtual base!"); 10733cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 1074e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Layout the base. 1075a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson CharUnits Offset = LayoutBase(Base); 1076e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson 1077e3bdbee47059839d5e24acab5ee7b925285f573eAnders Carlsson // Add its base class offset. 1078276b491b44b473d91610432aa335927b2c7ad152Anders Carlsson assert(!VBases.count(Base->Class) && "vbase offset already exists!"); 1079a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson VBases.insert(std::make_pair(Base->Class, Offset)); 10803cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson 10813cd09ccbb1a750a7b40593a7b0a2d95ee2a0ba0eAnders Carlsson AddPrimaryVirtualBaseOffsets(Base, Offset); 1082e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 1083e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1084a2311513524ecef954d2b438bfbe09aa9511b660Anders CarlssonCharUnits RecordLayoutBuilder::LayoutBase(const BaseSubobjectInfo *Base) { 1085b1d880b15f6b254349bd7a700e6b4f2ec1c24f5bAnders Carlsson const ASTRecordLayout &Layout = Context.getASTRecordLayout(Base->Class); 1086e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1087e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // If we have an empty base class, try to place it at offset 0. 1088b1d880b15f6b254349bd7a700e6b4f2ec1c24f5bAnders Carlsson if (Base->Class->isEmpty() && 1089a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson EmptySubobjects->CanPlaceBaseAtOffset(Base, CharUnits::Zero())) { 1090c3fddeb4384de2238ec03c77be6bee606725609eAnders Carlsson Size = std::max(Size, Layout.getSize()); 1091e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1092a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson return CharUnits::Zero(); 1093e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson } 1094bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 109543ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis unsigned UnpackedBaseAlign = Layout.getNonVirtualAlign(); 109643ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis unsigned BaseAlign = (Packed) ? 8 : UnpackedBaseAlign; 109743ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis 109843ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis // The maximum field alignment overrides base align. 109943ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis if (MaxFieldAlignment) { 110043ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis BaseAlign = std::min(BaseAlign, MaxFieldAlignment); 110143ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis UnpackedBaseAlign = std::min(UnpackedBaseAlign, MaxFieldAlignment); 110243ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis } 1103bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1104e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Round up the current record size to the base's alignment boundary. 1105e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson uint64_t Offset = llvm::RoundUpToAlignment(DataSize, BaseAlign); 1106bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1107e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Try to place the base. 1108a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson while (!EmptySubobjects->CanPlaceBaseAtOffset(Base, toCharUnits(Offset))) 1109e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson Offset += BaseAlign; 1110e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1111b1d880b15f6b254349bd7a700e6b4f2ec1c24f5bAnders Carlsson if (!Base->Class->isEmpty()) { 1112e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Update the data size. 1113c3fddeb4384de2238ec03c77be6bee606725609eAnders Carlsson DataSize = Offset + Layout.getNonVirtualSize(); 1114e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1115e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson Size = std::max(Size, DataSize); 1116e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson } else 1117c3fddeb4384de2238ec03c77be6bee606725609eAnders Carlsson Size = std::max(Size, Offset + Layout.getSize()); 1118e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1119e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson // Remember max struct/class alignment. 112043ddd9f2027bdd9c36336a342e9c0dd2aa13f836Argyrios Kyrtzidis UpdateAlignment(BaseAlign, UnpackedBaseAlign); 1121e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1122a2311513524ecef954d2b438bfbe09aa9511b660Anders Carlsson return toCharUnits(Offset); 1123e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson} 1124e239b9d5da3bdc722d29c276b261c136ca9f4eaaAnders Carlsson 1125c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbarvoid RecordLayoutBuilder::InitializeLayout(const Decl *D) { 1126c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (const RecordDecl *RD = dyn_cast<RecordDecl>(D)) 1127c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar IsUnion = RD->isUnion(); 11280aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1129a5dd722bdf2f74a1a249fe6661d96a7236aee0f0Anders Carlsson Packed = D->hasAttr<PackedAttr>(); 11300aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1131c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // mac68k alignment supersedes maximum field alignment and attribute aligned, 1132c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // and forces all structures to have 2-byte alignment. The IBM docs on it 1133c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // allude to additional (more complicated) semantics, especially with regard 1134c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // to bit-fields, but gcc appears not to follow that. 1135c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (D->hasAttr<AlignMac68kAttr>()) { 1136c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar IsMac68kAlign = true; 1137c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar MaxFieldAlignment = 2 * 8; 1138c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar Alignment = 2 * 8; 1139c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar } else { 1140c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (const MaxFieldAlignmentAttr *MFAA = D->getAttr<MaxFieldAlignmentAttr>()) 1141c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar MaxFieldAlignment = MFAA->getAlignment(); 11420aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1143cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt if (unsigned MaxAlign = D->getMaxAlignment()) 1144cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt UpdateAlignment(MaxAlign); 1145c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar } 1146c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson} 114774cbe226207fd101623638dadfa7fbada04ff2a6Anders Carlsson 1148c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlssonvoid RecordLayoutBuilder::Layout(const RecordDecl *D) { 1149c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson InitializeLayout(D); 1150a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson LayoutFields(D); 11511eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1152c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Finally, round the size of the total struct up to the alignment of the 1153c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // struct itself. 115478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FinishLayout(D); 1155c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson} 1156c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1157c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlssonvoid RecordLayoutBuilder::Layout(const CXXRecordDecl *RD) { 1158c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson InitializeLayout(RD); 1159c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1160c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Lay out the vtable and the non-virtual bases. 1161c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson LayoutNonVirtualBases(RD); 1162c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1163c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson LayoutFields(RD); 1164c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1165b2fafd4978166114c54748a73738d8b2c3a37e2bAnders Carlsson NonVirtualSize = Size; 1166b2fafd4978166114c54748a73738d8b2c3a37e2bAnders Carlsson NonVirtualAlignment = Alignment; 11673dee6efcad9ad56d14f7edd1c29924f0b876a7f9Mike Stump 1168c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Lay out the virtual bases and add the primary virtual base offsets. 1169c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson LayoutVirtualBases(RD, RD); 117097913576dbe624971bf18726899983d211d742c0Anders Carlsson 1171c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson VisitedVirtualBases.clear(); 1172eb19fa948173502f47c26357c2ec41aa4be197b4Mike Stump 1173bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Finally, round the size of the total struct up to the alignment of the 1174bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // struct itself. 117578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FinishLayout(RD); 1176c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1177a1e87162d36f94d3dc58ff3f0743d6026635a0c6Anders Carlsson#ifndef NDEBUG 1178c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // Check that we have base offsets for all bases. 1179c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 1180c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson E = RD->bases_end(); I != E; ++I) { 1181c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson if (I->isVirtual()) 1182c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson continue; 11830aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1184c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson const CXXRecordDecl *BaseDecl = 1185c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1186c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson 1187c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson assert(Bases.count(BaseDecl) && "Did not find base offset!"); 1188c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson } 11890aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1190c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson // And all virtual bases. 1191c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 1192c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson E = RD->vbases_end(); I != E; ++I) { 1193c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson const CXXRecordDecl *BaseDecl = 1194c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 11950aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 1196c6cab68ae1f8ebdcabaf51391dba09bfbad02e4fAnders Carlsson assert(VBases.count(BaseDecl) && "Did not find base offset!"); 1197a1e87162d36f94d3dc58ff3f0743d6026635a0c6Anders Carlsson } 1198a1e87162d36f94d3dc58ff3f0743d6026635a0c6Anders Carlsson#endif 1199bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 1200bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 12017d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::Layout(const ObjCInterfaceDecl *D) { 120293fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson if (ObjCInterfaceDecl *SD = D->getSuperClass()) { 12030f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson const ASTRecordLayout &SL = Context.getASTObjCInterfaceLayout(SD); 120493fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson 120593fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson UpdateAlignment(SL.getAlignment()); 12061eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 120793fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // We start laying out ivars not at the end of the superclass 120893fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // structure, but at the next byte following the last field. 1209243a68551ac9ec71bf341e062418e33eb4f286ffAnders Carlsson Size = llvm::RoundUpToAlignment(SL.getDataSize(), 8); 1210a223935e5cf82e939e1ca1da4111d63025a04e39Anders Carlsson DataSize = Size; 121193fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson } 12121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1213c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar InitializeLayout(D); 12148a2c92cab213bd7e28ff669577e815cd70bafbe3Daniel Dunbar 121593fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // Layout each ivar sequentially. 121693fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson llvm::SmallVector<ObjCIvarDecl*, 16> Ivars; 12170f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson Context.ShallowCollectObjCIvars(D, Ivars); 121893fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson for (unsigned i = 0, e = Ivars.size(); i != e; ++i) 121993fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson LayoutField(Ivars[i]); 12201eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 122193fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // Finally, round the size of the total struct up to the alignment of the 122293fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson // struct itself. 122378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FinishLayout(D); 122493fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson} 122593fab9d67ca62e3e291803e5a1309473d6e00344Anders Carlsson 12267d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::LayoutFields(const RecordDecl *D) { 1227a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson // Layout each field, for now, just sequentially, respecting alignment. In 1228a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson // the future, this will need to be tweakable by targets. 12291eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump for (RecordDecl::field_iterator Field = D->field_begin(), 1230bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar FieldEnd = D->field_end(); Field != FieldEnd; ++Field) 1231a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson LayoutField(*Field); 1232a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson} 1233a2df41c107d3c5f5bff2d090fab77734e0da735dAnders Carlsson 12340aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbarvoid RecordLayoutBuilder::LayoutWideBitField(uint64_t FieldSize, 123578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t TypeSize, 123678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool FieldPacked, 123778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis const FieldDecl *D) { 12384cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson assert(Context.getLangOptions().CPlusPlus && 12394cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson "Can only have wide bit-fields in C++!"); 12400aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12414cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Itanium C++ ABI 2.4: 12420aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar // If sizeof(T)*8 < n, let T' be the largest integral POD type with 12434cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // sizeof(T')*8 <= n. 12440aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12454cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson QualType IntegralPODTypes[] = { 12460aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar Context.UnsignedCharTy, Context.UnsignedShortTy, Context.UnsignedIntTy, 12474cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson Context.UnsignedLongTy, Context.UnsignedLongLongTy 12484cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson }; 12494cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12504cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson QualType Type; 12514cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson for (unsigned I = 0, E = llvm::array_lengthof(IntegralPODTypes); 12524cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson I != E; ++I) { 12534cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson uint64_t Size = Context.getTypeSize(IntegralPODTypes[I]); 12544cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12554cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson if (Size > FieldSize) 12564cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson break; 12574cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12584cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson Type = IntegralPODTypes[I]; 12594cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } 12604cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson assert(!Type.isNull() && "Did not find a type!"); 12610aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12624cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson unsigned TypeAlign = Context.getTypeAlign(Type); 12634cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12644cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // We're not going to use any of the unfilled bits in the last byte. 12654cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson UnfilledBitsInLastByte = 0; 12664cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 1267de9f153b2348f590151504888c22cb937134cd27Anders Carlsson uint64_t FieldOffset; 126878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedFieldOffset = DataSize - UnfilledBitsInLastByte; 12690aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12704cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson if (IsUnion) { 12714cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson DataSize = std::max(DataSize, FieldSize); 1272de9f153b2348f590151504888c22cb937134cd27Anders Carlsson FieldOffset = 0; 12734cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } else { 1274de9f153b2348f590151504888c22cb937134cd27Anders Carlsson // The bitfield is allocated starting at the next offset aligned appropriately 12750aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar // for T', with length n bits. 1276de9f153b2348f590151504888c22cb937134cd27Anders Carlsson FieldOffset = llvm::RoundUpToAlignment(DataSize, TypeAlign); 12770aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12784cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson uint64_t NewSizeInBits = FieldOffset + FieldSize; 12790aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12804cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson DataSize = llvm::RoundUpToAlignment(NewSizeInBits, 8); 12814cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson UnfilledBitsInLastByte = DataSize - NewSizeInBits; 12824cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } 12834cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12844cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Place this field at the current location. 12854cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson FieldOffsets.push_back(FieldOffset); 12864cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 128778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis CheckFieldPadding(FieldOffset, UnpaddedFieldOffset, FieldOffset, 128878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis TypeAlign, FieldPacked, D); 128978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 12904cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Update the size. 12914cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson Size = std::max(Size, DataSize); 12920aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 12934cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson // Remember max struct/class alignment. 12944cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson UpdateAlignment(TypeAlign); 12954cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson} 12964cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 12977d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::LayoutBitField(const FieldDecl *D) { 129842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson bool FieldPacked = Packed || D->hasAttr<PackedAttr>(); 129978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedFieldOffset = DataSize - UnfilledBitsInLastByte; 130078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t FieldOffset = IsUnion ? 0 : UnpaddedFieldOffset; 13010f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson uint64_t FieldSize = D->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 1302bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 13030f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson std::pair<uint64_t, unsigned> FieldInfo = Context.getTypeInfo(D->getType()); 130442dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson uint64_t TypeSize = FieldInfo.first; 130542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson unsigned FieldAlign = FieldInfo.second; 1306bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 13074cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson if (FieldSize > TypeSize) { 130878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis LayoutWideBitField(FieldSize, TypeSize, FieldPacked, D); 13094cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson return; 13104cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson } 13114cf6f5fdc529f0b4412505e2e6af099370a479b3Anders Carlsson 131278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // The align if the field is not packed. This is to check if the attribute 131378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // was unnecessary (-Wpacked). 131478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned UnpackedFieldAlign = FieldAlign; 131578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedFieldOffset = FieldOffset; 131678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (!Context.Target.useBitFieldTypeAlignment()) 131778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign = 1; 131878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 13190f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson if (FieldPacked || !Context.Target.useBitFieldTypeAlignment()) 132042dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldAlign = 1; 1321cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt FieldAlign = std::max(FieldAlign, D->getMaxAlignment()); 132278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign = std::max(UnpackedFieldAlign, D->getMaxAlignment()); 13231eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 132442dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // The maximum field alignment overrides the aligned attribute. 132578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (MaxFieldAlignment) { 132642dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldAlign = std::min(FieldAlign, MaxFieldAlignment); 132778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign = std::min(UnpackedFieldAlign, MaxFieldAlignment); 132878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 1329bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1330b6a169395c1b30c76daffebcbd2164b6247a5d21Daniel Dunbar // Check if we need to add padding to give the field the correct alignment. 133142dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (FieldSize == 0 || (FieldOffset & (FieldAlign-1)) + FieldSize > TypeSize) 133284b0316f720bd089d87acb21ec0002b2da33e6c9Daniel Dunbar FieldOffset = llvm::RoundUpToAlignment(FieldOffset, FieldAlign); 1333bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 133478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (FieldSize == 0 || 133578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis (UnpackedFieldOffset & (UnpackedFieldAlign-1)) + FieldSize > TypeSize) 133678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldOffset = llvm::RoundUpToAlignment(UnpackedFieldOffset, 133778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign); 133878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1339b6a169395c1b30c76daffebcbd2164b6247a5d21Daniel Dunbar // Padding members don't affect overall alignment. 134042dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (!D->getIdentifier()) 134178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis FieldAlign = UnpackedFieldAlign = 1; 1342bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 134342dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Place this field at the current location. 134442dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldOffsets.push_back(FieldOffset); 1345bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 134678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis CheckFieldPadding(FieldOffset, UnpaddedFieldOffset, UnpackedFieldOffset, 134778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign, FieldPacked, D); 134878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1349e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // Update DataSize to include the last byte containing (part of) the bitfield. 1350e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson if (IsUnion) { 1351e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // FIXME: I think FieldSize should be TypeSize here. 1352e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson DataSize = std::max(DataSize, FieldSize); 1353e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson } else { 1354e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson uint64_t NewSizeInBits = FieldOffset + FieldSize; 1355bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1356e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson DataSize = llvm::RoundUpToAlignment(NewSizeInBits, 8); 1357e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson UnfilledBitsInLastByte = DataSize - NewSizeInBits; 1358e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson } 1359bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1360e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // Update the size. 1361e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson Size = std::max(Size, DataSize); 1362bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 136342dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Remember max struct/class alignment. 136478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UpdateAlignment(FieldAlign, UnpackedFieldAlign); 136542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson} 13661eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 13677d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlssonvoid RecordLayoutBuilder::LayoutField(const FieldDecl *D) { 136842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (D->isBitField()) { 136942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson LayoutBitField(D); 137042dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson return; 137142dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } 13721eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 137378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedFieldOffset = DataSize - UnfilledBitsInLastByte; 137478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1375e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson // Reset the unfilled bits. 1376e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson UnfilledBitsInLastByte = 0; 1377e4fc0d97420e13d13c9664a3c27c17aa7c1e47b9Anders Carlsson 137842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson bool FieldPacked = Packed || D->hasAttr<PackedAttr>(); 137942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson uint64_t FieldOffset = IsUnion ? 0 : DataSize; 138042dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson uint64_t FieldSize; 138142dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson unsigned FieldAlign; 1382bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 138342dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (D->getType()->isIncompleteArrayType()) { 138442dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // This is a flexible array member; we can't directly 138542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // query getTypeInfo about these, so we figure it out here. 138642dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Flexible array members don't have any size, but they 138742dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // have to be aligned appropriately for their element type. 138842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldSize = 0; 13890f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson const ArrayType* ATy = Context.getAsArrayType(D->getType()); 13900f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson FieldAlign = Context.getTypeAlign(ATy->getElementType()); 139142dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } else if (const ReferenceType *RT = D->getType()->getAs<ReferenceType>()) { 139242dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson unsigned AS = RT->getPointeeType().getAddressSpace(); 13930f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson FieldSize = Context.Target.getPointerWidth(AS); 13940f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson FieldAlign = Context.Target.getPointerAlign(AS); 139542dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } else { 13960f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson std::pair<uint64_t, unsigned> FieldInfo = Context.getTypeInfo(D->getType()); 139742dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldSize = FieldInfo.first; 1398bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson FieldAlign = FieldInfo.second; 139942dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson } 14001eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 140178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // The align if the field is not packed. This is to check if the attribute 140278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // was unnecessary (-Wpacked). 140378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned UnpackedFieldAlign = FieldAlign; 140478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedFieldOffset = FieldOffset; 140578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 140642dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson if (FieldPacked) 140742dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldAlign = 8; 1408cf807c4dfdb23e8fa3f400e0b24ef5b79db7a530Sean Hunt FieldAlign = std::max(FieldAlign, D->getMaxAlignment()); 140978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign = std::max(UnpackedFieldAlign, D->getMaxAlignment()); 14101eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 141142dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // The maximum field alignment overrides the aligned attribute. 141278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (MaxFieldAlignment) { 141342dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldAlign = std::min(FieldAlign, MaxFieldAlignment); 141478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign = std::min(UnpackedFieldAlign, MaxFieldAlignment); 141578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 14161eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 141742dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // Round up the current record size to the field's alignment boundary. 141842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldOffset = llvm::RoundUpToAlignment(FieldOffset, FieldAlign); 141978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldOffset = llvm::RoundUpToAlignment(UnpackedFieldOffset, 142078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign); 1421bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 142283a45e7dab892e9efd3515eca4eb5b81bc3f2126Anders Carlsson if (!IsUnion && EmptySubobjects) { 142383a45e7dab892e9efd3515eca4eb5b81bc3f2126Anders Carlsson // Check if we can place the field at this offset. 1424a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson while (!EmptySubobjects->CanPlaceFieldAtOffset(D, 1425a3d4380d6662a373bc78f915947e5bc06e985e91Anders Carlsson toCharUnits(FieldOffset))) { 142642dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson // We couldn't place the field at the offset. Try again at a new offset. 142742dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson FieldOffset += FieldAlign; 14286026504302763f74102592602b392cecd5ced3aeAnders Carlsson } 1429bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson } 1430bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1431bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Place this field at the current location. 1432bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson FieldOffsets.push_back(FieldOffset); 14331eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 143478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis CheckFieldPadding(FieldOffset, UnpaddedFieldOffset, UnpackedFieldOffset, 143578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedFieldAlign, FieldPacked, D); 143678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1437bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Reserve space for this field. 1438bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson if (IsUnion) 1439bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson Size = std::max(Size, FieldSize); 1440bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson else 1441bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson Size = FieldOffset + FieldSize; 14421eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1443a223935e5cf82e939e1ca1da4111d63025a04e39Anders Carlsson // Update the data size. 1444a223935e5cf82e939e1ca1da4111d63025a04e39Anders Carlsson DataSize = Size; 14451eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1446bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Remember max struct/class alignment. 144778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UpdateAlignment(FieldAlign, UnpackedFieldAlign); 1448bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 1449bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 145078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidisvoid RecordLayoutBuilder::FinishLayout(const NamedDecl *D) { 1451bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // In C++, records cannot be of size 0. 14520f0e9b0ace2a970d31ac31811f07e0b1d93501d6Anders Carlsson if (Context.getLangOptions().CPlusPlus && Size == 0) 1453bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson Size = 8; 1454bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // Finally, round the size of the record up to the alignment of the 1455bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson // record itself. 145678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedSize = Size - UnfilledBitsInLastByte; 145778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedSize = llvm::RoundUpToAlignment(Size, UnpackedAlignment); 145842dbcc4d8f0c483693befc76f37ca6dc4e0844e1Anders Carlsson Size = llvm::RoundUpToAlignment(Size, Alignment); 145978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 146078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned CharBitNum = Context.Target.getCharWidth(); 146178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (const RecordDecl *RD = dyn_cast<RecordDecl>(D)) { 146278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if padding was introduced to the struct/class/union. 146378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (Size > UnpaddedSize) { 146478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned PadSize = Size - UnpaddedSize; 146578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool InBits = true; 146678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (PadSize % CharBitNum == 0) { 146778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis PadSize = PadSize / CharBitNum; 146878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis InBits = false; 146978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 147078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(RD->getLocation(), diag::warn_padded_struct_size) 147178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(RD) 147278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << PadSize 147378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (InBits ? 1 : 0) /*(byte|bit)*/ << (PadSize > 1); // plural or not 147478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 147578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 147678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if we packed it unnecessarily. If the alignment is 1 byte don't 147778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // bother since there won't be alignment issues. 147878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (Packed && UnpackedAlignment > CharBitNum && Size == UnpackedSize) 147978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_unnecessary_packed) 148078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(RD); 148178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 1482bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 1483bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson 148478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidisvoid RecordLayoutBuilder::UpdateAlignment(unsigned NewAlignment, 148578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned UnpackedNewAlignment) { 1486c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar // The alignment is not modified when using 'mac68k' alignment. 1487c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar if (IsMac68kAlign) 1488c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar return; 1489c6082fe347a414a2e19f2ad8fe41720f10733296Daniel Dunbar 149078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (NewAlignment > Alignment) { 149178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis assert(llvm::isPowerOf2_32(NewAlignment && "Alignment not a power of 2")); 149278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Alignment = NewAlignment; 149378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 149478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 149578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (UnpackedNewAlignment > UnpackedAlignment) { 149678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis assert(llvm::isPowerOf2_32(UnpackedNewAlignment && 149778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis "Alignment not a power of 2")); 149878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis UnpackedAlignment = UnpackedNewAlignment; 149978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 150078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis} 150178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 150278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidisvoid RecordLayoutBuilder::CheckFieldPadding(uint64_t Offset, 150378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpaddedOffset, 150478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis uint64_t UnpackedOffset, 150578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned UnpackedAlign, 150678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool isPacked, 150778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis const FieldDecl *D) { 150878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // We let objc ivars without warning, objc interfaces generally are not used 150978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // for padding tricks. 151078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (isa<ObjCIvarDecl>(D)) 1511bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson return; 15121eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 151378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned CharBitNum = Context.Target.getCharWidth(); 15141eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 151578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if padding was introduced to the struct/class. 151678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (!IsUnion && Offset > UnpaddedOffset) { 151778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis unsigned PadSize = Offset - UnpaddedOffset; 151878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis bool InBits = true; 151978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (PadSize % CharBitNum == 0) { 152078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis PadSize = PadSize / CharBitNum; 152178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis InBits = false; 152278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 152378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (D->getIdentifier()) 152478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_padded_struct_field) 152578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (D->getParent()->isStruct() ? 0 : 1) // struct|class 152678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(D->getParent()) 152778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << PadSize 152878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (InBits ? 1 : 0) /*(byte|bit)*/ << (PadSize > 1) // plural or not 152978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << D->getIdentifier(); 153078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis else 153178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_padded_struct_anon_field) 153278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (D->getParent()->isStruct() ? 0 : 1) // struct|class 153378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << Context.getTypeDeclType(D->getParent()) 153478a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << PadSize 153578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << (InBits ? 1 : 0) /*(byte|bit)*/ << (PadSize > 1); // plural or not 153678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis } 153778a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 153878a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // Warn if we packed it unnecessarily. If the alignment is 1 byte don't 153978a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis // bother since there won't be alignment issues. 154078a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis if (isPacked && UnpackedAlign > CharBitNum && Offset == UnpackedOffset) 154178a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis Diag(D->getLocation(), diag::warn_unnecessary_packed) 154278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis << D->getIdentifier(); 1543bda4c1015e27ac82d31afb4519dd53586e61a51aAnders Carlsson} 15441eb4433ac451dc16f4133a88af2d002ac26c58efMike Stump 1545f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlssonconst CXXMethodDecl * 15467d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders CarlssonRecordLayoutBuilder::ComputeKeyFunction(const CXXRecordDecl *RD) { 15478d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar // If a class isn't polymorphic it doesn't have a key function. 1548f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (!RD->isPolymorphic()) 1549f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson return 0; 155061eab8872168af6eb1e0047a82901096cf145e27Eli Friedman 155161eab8872168af6eb1e0047a82901096cf145e27Eli Friedman // A class inside an anonymous namespace doesn't have a key function. (Or 155261eab8872168af6eb1e0047a82901096cf145e27Eli Friedman // at least, there's no point to assigning a key function to such a class; 155361eab8872168af6eb1e0047a82901096cf145e27Eli Friedman // this doesn't affect the ABI.) 155461eab8872168af6eb1e0047a82901096cf145e27Eli Friedman if (RD->isInAnonymousNamespace()) 155561eab8872168af6eb1e0047a82901096cf145e27Eli Friedman return 0; 155661eab8872168af6eb1e0047a82901096cf145e27Eli Friedman 15573bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis // Template instantiations don't have key functions,see Itanium C++ ABI 5.2.6. 15583bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis // Same behavior as GCC. 15593bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis TemplateSpecializationKind TSK = RD->getTemplateSpecializationKind(); 15603bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis if (TSK == TSK_ImplicitInstantiation || 15613bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis TSK == TSK_ExplicitInstantiationDefinition) 15623bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis return 0; 15633bd5b6c3c2ad1d5a6f88cf21f627e8d4f03c4df4Argyrios Kyrtzidis 1564bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::method_iterator I = RD->method_begin(), 1565bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->method_end(); I != E; ++I) { 1566f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson const CXXMethodDecl *MD = *I; 1567bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1568f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (!MD->isVirtual()) 1569f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 1570bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1571f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (MD->isPure()) 1572f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 157361eab8872168af6eb1e0047a82901096cf145e27Eli Friedman 1574f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson // Ignore implicit member functions, they are always marked as inline, but 1575f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson // they don't have a body until they're defined. 1576f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (MD->isImplicit()) 1577f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 1578bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1579bd6d6197fcfc98356ea60e816365eb0648b69556Douglas Gregor if (MD->isInlineSpecified()) 1580bd6d6197fcfc98356ea60e816365eb0648b69556Douglas Gregor continue; 1581f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson 1582f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson if (MD->hasInlineBody()) 1583f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson continue; 1584bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1585f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson // We found it. 1586f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson return MD; 1587f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson } 1588bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1589f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson return 0; 1590f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson} 1591f53df2398e07d13be9962b95aebc19b31706fa33Anders Carlsson 159278a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios KyrtzidisDiagnosticBuilder 159378a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios KyrtzidisRecordLayoutBuilder::Diag(SourceLocation Loc, unsigned DiagID) { 159433e4e70c8c0a17e0ccb7465d96556b077a68ecb1Argyrios Kyrtzidis return Context.getDiagnostics().Report(Loc, DiagID); 159578a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis} 159678a916ec5ff5b66adec3c499e1b9af7b87668309Argyrios Kyrtzidis 1597cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramernamespace { 1598cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer // This class implements layout specific to the Microsoft ABI. 1599cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer class MSRecordLayoutBuilder : public RecordLayoutBuilder { 1600cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer public: 1601cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer MSRecordLayoutBuilder(ASTContext& Ctx, EmptySubobjectMap *EmptySubobjects) : 1602cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer RecordLayoutBuilder(Ctx, EmptySubobjects) {} 1603cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer 1604cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer virtual uint64_t GetVirtualPointersSize(const CXXRecordDecl *RD) const; 1605cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer }; 1606cb9c07418b699bd2b8384d31ff4392df7d76eb7cBenjamin Kramer} 1607c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 1608c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davisuint64_t 1609c9f8aece7e111f90265dfad9a81f3f517be948deCharles DavisMSRecordLayoutBuilder::GetVirtualPointersSize(const CXXRecordDecl *RD) const { 1610c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis // We should reserve space for two pointers if the class has both 1611c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis // virtual functions and virtual bases. 1612c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis if (RD->isPolymorphic() && RD->getNumVBases() > 0) 1613c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis return 2 * Context.Target.getPointerWidth(0); 1614c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis return Context.Target.getPointerWidth(0); 1615c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis} 1616c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis 16171e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// getASTRecordLayout - Get or compute information about the layout of the 16181e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// specified record (struct/union/class), which indicates its size and field 16191e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// position information. 16201e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlssonconst ASTRecordLayout &ASTContext::getASTRecordLayout(const RecordDecl *D) { 16211e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson D = D->getDefinition(); 16221e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson assert(D && "Cannot get layout of forward declarations!"); 16231e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16241e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Look up this layout, if already laid out, return what we have. 16251e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Note that we can't save a reference to the entry because this function 16261e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // is recursive. 16271e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson const ASTRecordLayout *Entry = ASTRecordLayouts[D]; 16281e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (Entry) return *Entry; 16291e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16302f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson const ASTRecordLayout *NewEntry; 16312f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16322f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) { 1633261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson EmptySubobjectMap EmptySubobjects(*this, RD); 163458b16b6e46716e24f1cdaa0a5e1253415c4e30b3Anders Carlsson 1635c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis // When compiling for Microsoft, use the special MS builder. 1636cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis llvm::OwningPtr<RecordLayoutBuilder> Builder; 163720cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis switch (Target.getCXXABI()) { 163820cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis default: 1639cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis Builder.reset(new RecordLayoutBuilder(*this, &EmptySubobjects)); 164020cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis break; 164120cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis case CXXABI_Microsoft: 1642cfe17e5c82762cc854012e472b66f4278f0a4a2aArgyrios Kyrtzidis Builder.reset(new MSRecordLayoutBuilder(*this, &EmptySubobjects)); 164320cf717034ba1f20fc47c025ecb72ed9b631ad13Charles Davis } 1644c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->Layout(RD); 16452f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16462f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // FIXME: This is not always correct. See the part about bitfields at 16472f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // http://www.codesourcery.com/public/cxx-abi/abi.html#POD for more info. 16482f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // FIXME: IsPODForThePurposeOfLayout should be stored in the record layout. 16492f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson bool IsPODForThePurposeOfLayout = cast<CXXRecordDecl>(D)->isPOD(); 16502f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16512f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson // FIXME: This should be done in FinalizeLayout. 16522f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson uint64_t DataSize = 1653c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis IsPODForThePurposeOfLayout ? Builder->Size : Builder->DataSize; 16542f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson uint64_t NonVirtualSize = 1655c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis IsPODForThePurposeOfLayout ? DataSize : Builder->NonVirtualSize; 16562f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16570aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar NewEntry = 1658c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis new (*this) ASTRecordLayout(*this, Builder->Size, Builder->Alignment, 1659c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis DataSize, Builder->FieldOffsets.data(), 1660c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->FieldOffsets.size(), 16612f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson NonVirtualSize, 1662c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->NonVirtualAlignment, 1663261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson EmptySubobjects.SizeOfLargestEmptySubobject, 1664c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->PrimaryBase, 1665c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->PrimaryBaseIsVirtual, 1666c9f8aece7e111f90265dfad9a81f3f517be948deCharles Davis Builder->Bases, Builder->VBases); 16672f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson } else { 1668261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson RecordLayoutBuilder Builder(*this, /*EmptySubobjects=*/0); 16692f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson Builder.Layout(D); 16700aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 16712f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson NewEntry = 16722f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson new (*this) ASTRecordLayout(*this, Builder.Size, Builder.Alignment, 16732f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson Builder.Size, 16742f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson Builder.FieldOffsets.data(), 16752f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson Builder.FieldOffsets.size()); 16762f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson } 16772f64e377d1aa733b81a4c5e78e32a62c41426626Anders Carlsson 16781e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson ASTRecordLayouts[D] = NewEntry; 16791e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16801e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (getLangOptions().DumpRecordLayouts) { 16811e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson llvm::errs() << "\n*** Dumping AST Record Layout\n"; 16821e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson DumpRecordLayout(D, llvm::errs()); 16831e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson } 16841e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16851e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return *NewEntry; 16861e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson} 16871e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16881e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlssonconst CXXMethodDecl *ASTContext::getKeyFunction(const CXXRecordDecl *RD) { 16891e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson RD = cast<CXXRecordDecl>(RD->getDefinition()); 16901e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson assert(RD && "Cannot get key function for forward declarations!"); 16910aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 16921e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson const CXXMethodDecl *&Entry = KeyFunctions[RD]; 16930aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar if (!Entry) 16947d0918acd134ab93b7d3eb6add93dfde37b1f7b3Anders Carlsson Entry = RecordLayoutBuilder::ComputeKeyFunction(RD); 16950aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 16961e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return Entry; 16971e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson} 16981e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 16991e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// getInterfaceLayoutImpl - Get or compute information about the 17001e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// layout of the given interface. 17011e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// 17021e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// \param Impl - If given, also include the layout of the interface's 17031e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson/// implementation. This may differ by including synthesized ivars. 17041e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlssonconst ASTRecordLayout & 17051e641ce1c169b4b0cac3d7ad6da44b323453049cAnders CarlssonASTContext::getObjCLayout(const ObjCInterfaceDecl *D, 17061e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson const ObjCImplementationDecl *Impl) { 17071e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson assert(!D->isForwardDecl() && "Invalid interface decl!"); 17081e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17091e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Look up this layout, if already laid out, return what we have. 17101e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson ObjCContainerDecl *Key = 17111e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson Impl ? (ObjCContainerDecl*) Impl : (ObjCContainerDecl*) D; 17121e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (const ASTRecordLayout *Entry = ObjCLayouts[Key]) 17131e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return *Entry; 17141e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17151e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // Add in synthesized ivar count if laying out an implementation. 17161e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (Impl) { 17171e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson unsigned SynthCount = CountNonClassIvars(D); 17181e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // If there aren't any sythesized ivars then reuse the interface 17191e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // entry. Note we can't cache this because we simply free all 17201e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // entries later; however we shouldn't look up implementations 17211e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson // frequently. 17221e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson if (SynthCount == 0) 17231e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return getObjCLayout(D, 0); 17241e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson } 17251e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 1726261febd091cd05325ae202b7d388a2d266bbf126Anders Carlsson RecordLayoutBuilder Builder(*this, /*EmptySubobjects=*/0); 172736cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson Builder.Layout(D); 172836cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson 17291e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson const ASTRecordLayout *NewEntry = 173036cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson new (*this) ASTRecordLayout(*this, Builder.Size, Builder.Alignment, 173136cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson Builder.DataSize, 173236cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson Builder.FieldOffsets.data(), 173336cdc61b98460c06ee07710f77b911675fdce6a7Anders Carlsson Builder.FieldOffsets.size()); 17340aa7edbc1f579787c4f69144fd1b04e777d89391Daniel Dunbar 17351e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson ObjCLayouts[Key] = NewEntry; 17361e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 17371e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson return *NewEntry; 17381e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson} 17391e641ce1c169b4b0cac3d7ad6da44b323453049cAnders Carlsson 1740bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbarstatic void PrintOffset(llvm::raw_ostream &OS, 17413069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits Offset, unsigned IndentLevel) { 17423069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson OS << llvm::format("%4d | ", Offset.getQuantity()); 1743bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS.indent(IndentLevel * 2); 1744bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar} 1745bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1746bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbarstatic void DumpCXXRecordLayout(llvm::raw_ostream &OS, 1747bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const CXXRecordDecl *RD, ASTContext &C, 17483069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits Offset, 1749bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar unsigned IndentLevel, 1750bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const char* Description, 1751bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar bool IncludeVirtualBases) { 17523069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson const ASTRecordLayout &Layout = C.getASTRecordLayout(RD); 1753bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1754bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar PrintOffset(OS, Offset, IndentLevel); 1755cb421fa690da545b58a720abe5f1c49b166dbde7Dan Gohman OS << C.getTypeDeclType(const_cast<CXXRecordDecl *>(RD)).getAsString(); 1756bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (Description) 1757bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << ' ' << Description; 1758bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (RD->isEmpty()) 1759bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << " (empty)"; 1760bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << '\n'; 1761bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1762bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar IndentLevel++; 1763bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 17643069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson const CXXRecordDecl *PrimaryBase = Layout.getPrimaryBase(); 1765bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1766bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Vtable pointer. 1767bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (RD->isDynamicClass() && !PrimaryBase) { 1768bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar PrintOffset(OS, Offset, IndentLevel); 1769900fc6388e803868a34b9483510c345e9b49d7ebBenjamin Kramer OS << '(' << RD << " vtable pointer)\n"; 1770bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1771bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Dump (non-virtual) bases 1772bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 1773bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->bases_end(); I != E; ++I) { 1774bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar assert(!I->getType()->isDependentType() && 1775bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar "Cannot layout class with dependent bases."); 1776bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (I->isVirtual()) 1777bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar continue; 1778bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1779bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const CXXRecordDecl *Base = 1780bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1781bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 17823069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits BaseOffset = Offset + Layout.getBaseClassOffset(Base); 1783bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1784bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar DumpCXXRecordLayout(OS, Base, C, BaseOffset, IndentLevel, 1785bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar Base == PrimaryBase ? "(primary base)" : "(base)", 1786bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar /*IncludeVirtualBases=*/false); 1787bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1788bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1789bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Dump fields. 1790bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar uint64_t FieldNo = 0; 1791bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1792bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->field_end(); I != E; ++I, ++FieldNo) { 1793bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const FieldDecl *Field = *I; 17943069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits FieldOffset = Offset + 17953069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits::fromQuantity(Layout.getFieldOffset(FieldNo) / 17963069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson C.getCharWidth()); 1797bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1798bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 1799bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (const CXXRecordDecl *D = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 1800bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar DumpCXXRecordLayout(OS, D, C, FieldOffset, IndentLevel, 18014087f27e5416c799bcb6be072f905be752acb61cDaniel Dunbar Field->getName().data(), 1802bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar /*IncludeVirtualBases=*/true); 1803bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar continue; 1804bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1805bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1806bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1807bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar PrintOffset(OS, FieldOffset, IndentLevel); 1808900fc6388e803868a34b9483510c345e9b49d7ebBenjamin Kramer OS << Field->getType().getAsString() << ' ' << Field << '\n'; 1809bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1810bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1811bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar if (!IncludeVirtualBases) 1812bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar return; 1813bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 1814bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar // Dump virtual bases. 1815bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 1816bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar E = RD->vbases_end(); I != E; ++I) { 1817bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar assert(I->isVirtual() && "Found non-virtual class!"); 1818bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar const CXXRecordDecl *VBase = 1819bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar cast<CXXRecordDecl>(I->getType()->getAs<RecordType>()->getDecl()); 1820bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 18213069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson CharUnits VBaseOffset = Offset + Layout.getVBaseClassOffset(VBase); 1822bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar DumpCXXRecordLayout(OS, VBase, C, VBaseOffset, IndentLevel, 1823bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar VBase == PrimaryBase ? 1824bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar "(primary virtual base)" : "(virtual base)", 1825bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar /*IncludeVirtualBases=*/false); 1826bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar } 1827bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar 18283069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson OS << " sizeof=" << Layout.getSize() / 8; 18293069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson OS << ", dsize=" << Layout.getDataSize() / 8; 18303069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson OS << ", align=" << Layout.getAlignment() / 8 << '\n'; 18313069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson OS << " nvsize=" << Layout.getNonVirtualSize() / 8; 18323069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson OS << ", nvalign=" << Layout.getNonVirtualAlign() / 8 << '\n'; 1833bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar OS << '\n'; 1834bf9e48cbaaa23d990dbedf9489513500bd0b9751Daniel Dunbar} 18358d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar 18368d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbarvoid ASTContext::DumpRecordLayout(const RecordDecl *RD, 18378d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar llvm::raw_ostream &OS) { 18388d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar const ASTRecordLayout &Info = getASTRecordLayout(RD); 18398d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar 18408d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar if (const CXXRecordDecl *CXXRD = dyn_cast<CXXRecordDecl>(RD)) 18413069a0d28637ad0ad583d9fdd7bc6bc6aa677fb5Anders Carlsson return DumpCXXRecordLayout(OS, CXXRD, *this, CharUnits(), 0, 0, 18428d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar /*IncludeVirtualBases=*/true); 18438d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar 18448d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "Type: " << getTypeDeclType(RD).getAsString() << "\n"; 18458d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "Record: "; 18468d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar RD->dump(); 18478d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "\nLayout: "; 18488d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "<ASTRecordLayout\n"; 18498d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << " Size:" << Info.getSize() << "\n"; 18508d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << " DataSize:" << Info.getDataSize() << "\n"; 18518d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << " Alignment:" << Info.getAlignment() << "\n"; 18528d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << " FieldOffsets: ["; 18538d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar for (unsigned i = 0, e = Info.getFieldCount(); i != e; ++i) { 18548d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar if (i) OS << ", "; 18558d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << Info.getFieldOffset(i); 18568d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar } 18578d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar OS << "]>\n"; 18588d8ab749f6f8bb63ea2cd2b589c0f050b67fc5ccDaniel Dunbar} 1859