Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 1 | //===--- TransGCAttrs.cpp - Transformations to ARC mode --------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #include "Transforms.h" |
| 11 | #include "Internals.h" |
| 12 | #include "clang/Lex/Lexer.h" |
| 13 | #include "clang/Basic/SourceManager.h" |
| 14 | #include "clang/Analysis/Support/SaveAndRestore.h" |
| 15 | |
| 16 | using namespace clang; |
| 17 | using namespace arcmt; |
| 18 | using namespace trans; |
| 19 | |
| 20 | namespace { |
| 21 | |
| 22 | /// \brief Collects all the places where GC attributes __strong/__weak occur. |
| 23 | class GCAttrsCollector : public RecursiveASTVisitor<GCAttrsCollector> { |
| 24 | MigrationContext &MigrateCtx; |
| 25 | bool FullyMigratable; |
| 26 | |
| 27 | typedef RecursiveASTVisitor<GCAttrsCollector> base; |
| 28 | public: |
| 29 | explicit GCAttrsCollector(MigrationContext &ctx) |
| 30 | : MigrateCtx(ctx), FullyMigratable(false) { } |
| 31 | |
| 32 | bool shouldWalkTypesOfTypeLocs() const { return false; } |
| 33 | |
| 34 | bool VisitAttributedTypeLoc(AttributedTypeLoc TL) { |
| 35 | handleAttr(TL); |
| 36 | return true; |
| 37 | } |
| 38 | |
| 39 | bool TraverseDecl(Decl *D) { |
| 40 | if (!D || D->isImplicit()) |
| 41 | return true; |
| 42 | |
| 43 | bool migratable = isMigratable(D); |
| 44 | SaveAndRestore<bool> Save(FullyMigratable, migratable); |
| 45 | |
| 46 | if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) |
| 47 | lookForAttribute(DD, DD->getTypeSourceInfo()); |
| 48 | else if (ObjCPropertyDecl *PropD = dyn_cast<ObjCPropertyDecl>(D)) |
| 49 | lookForAttribute(PropD, PropD->getTypeSourceInfo()); |
| 50 | return base::TraverseDecl(D); |
| 51 | } |
| 52 | |
| 53 | void lookForAttribute(Decl *D, TypeSourceInfo *TInfo) { |
| 54 | if (!TInfo) |
| 55 | return; |
| 56 | TypeLoc TL = TInfo->getTypeLoc(); |
| 57 | while (TL) { |
| 58 | if (const AttributedTypeLoc *Attr = dyn_cast<AttributedTypeLoc>(&TL)) { |
| 59 | if (handleAttr(*Attr, D)) |
| 60 | break; |
| 61 | TL = Attr->getModifiedLoc(); |
| 62 | } if (const ArrayTypeLoc *Arr = dyn_cast<ArrayTypeLoc>(&TL)) { |
| 63 | TL = Arr->getElementLoc(); |
| 64 | } else if (const PointerTypeLoc *PT = dyn_cast<PointerTypeLoc>(&TL)) { |
| 65 | TL = PT->getPointeeLoc(); |
| 66 | } else if (const ReferenceTypeLoc *RT = dyn_cast<ReferenceTypeLoc>(&TL)) |
| 67 | TL = RT->getPointeeLoc(); |
| 68 | else |
| 69 | break; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | bool handleAttr(AttributedTypeLoc TL, Decl *D = 0) { |
| 74 | if (TL.getAttrKind() != AttributedType::attr_objc_ownership) |
| 75 | return false; |
| 76 | |
| 77 | SourceLocation Loc = TL.getAttrNameLoc(); |
| 78 | unsigned RawLoc = Loc.getRawEncoding(); |
| 79 | if (MigrateCtx.AttrSet.count(RawLoc)) |
| 80 | return true; |
| 81 | |
| 82 | ASTContext &Ctx = MigrateCtx.Pass.Ctx; |
| 83 | SourceManager &SM = Ctx.getSourceManager(); |
| 84 | llvm::SmallString<32> Buf; |
| 85 | bool Invalid = false; |
| 86 | StringRef Spell = Lexer::getSpelling( |
| 87 | SM.getSpellingLoc(TL.getAttrEnumOperandLoc()), |
| 88 | Buf, SM, Ctx.getLangOptions(), &Invalid); |
| 89 | if (Invalid) |
| 90 | return false; |
| 91 | MigrationContext::GCAttrOccurrence::AttrKind Kind; |
| 92 | if (Spell == "strong") |
| 93 | Kind = MigrationContext::GCAttrOccurrence::Strong; |
| 94 | else if (Spell == "weak") |
| 95 | Kind = MigrationContext::GCAttrOccurrence::Weak; |
| 96 | else |
| 97 | return false; |
| 98 | |
| 99 | MigrateCtx.AttrSet.insert(RawLoc); |
| 100 | MigrateCtx.GCAttrs.push_back(MigrationContext::GCAttrOccurrence()); |
| 101 | MigrationContext::GCAttrOccurrence &Attr = MigrateCtx.GCAttrs.back(); |
| 102 | |
| 103 | Attr.Kind = Kind; |
Argyrios Kyrtzidis | 17ac319 | 2011-11-06 18:58:17 +0000 | [diff] [blame] | 104 | Attr.Loc = SM.getImmediateExpansionRange(Loc).first; |
Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 105 | Attr.ModifiedType = TL.getModifiedLoc().getType(); |
| 106 | Attr.Dcl = D; |
| 107 | Attr.FullyMigratable = FullyMigratable; |
| 108 | return true; |
| 109 | } |
| 110 | |
| 111 | bool isMigratable(Decl *D) { |
| 112 | if (isa<TranslationUnitDecl>(D)) |
| 113 | return false; |
| 114 | |
| 115 | if (isInMainFile(D)) |
| 116 | return true; |
| 117 | |
| 118 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) |
| 119 | return FD->hasBody(); |
| 120 | |
| 121 | if (ObjCContainerDecl *ContD = dyn_cast<ObjCContainerDecl>(D)) { |
| 122 | if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ContD)) |
| 123 | return ID->getImplementation() != 0; |
| 124 | if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(ContD)) |
| 125 | return CD->getImplementation() != 0; |
| 126 | if (isa<ObjCImplDecl>(ContD)) |
| 127 | return true; |
| 128 | return false; |
| 129 | } |
| 130 | |
| 131 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) { |
| 132 | for (CXXRecordDecl::method_iterator |
| 133 | MI = RD->method_begin(), ME = RD->method_end(); MI != ME; ++MI) { |
| 134 | if ((*MI)->isOutOfLine()) |
| 135 | return true; |
| 136 | } |
| 137 | return false; |
| 138 | } |
| 139 | |
| 140 | return isMigratable(cast<Decl>(D->getDeclContext())); |
| 141 | } |
| 142 | |
| 143 | bool isInMainFile(Decl *D) { |
| 144 | if (!D) |
| 145 | return false; |
| 146 | |
| 147 | for (Decl::redecl_iterator |
| 148 | I = D->redecls_begin(), E = D->redecls_end(); I != E; ++I) |
| 149 | if (!isInMainFile((*I)->getLocation())) |
| 150 | return false; |
| 151 | |
| 152 | return true; |
| 153 | } |
| 154 | |
| 155 | bool isInMainFile(SourceLocation Loc) { |
| 156 | if (Loc.isInvalid()) |
| 157 | return false; |
| 158 | |
| 159 | SourceManager &SM = MigrateCtx.Pass.Ctx.getSourceManager(); |
| 160 | return SM.isInFileID(SM.getExpansionLoc(Loc), SM.getMainFileID()); |
| 161 | } |
| 162 | }; |
| 163 | |
| 164 | } // anonymous namespace |
| 165 | |
Argyrios Kyrtzidis | 17ac319 | 2011-11-06 18:58:17 +0000 | [diff] [blame] | 166 | static void clearRedundantStrongs(MigrationContext &MigrateCtx) { |
| 167 | TransformActions &TA = MigrateCtx.Pass.TA; |
| 168 | |
| 169 | for (unsigned i = 0, e = MigrateCtx.GCAttrs.size(); i != e; ++i) { |
| 170 | MigrationContext::GCAttrOccurrence &Attr = MigrateCtx.GCAttrs[i]; |
| 171 | if (Attr.Kind == MigrationContext::GCAttrOccurrence::Strong && |
| 172 | Attr.FullyMigratable && Attr.Dcl) { |
| 173 | TypeSourceInfo *TInfo = 0; |
| 174 | if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(Attr.Dcl)) |
| 175 | TInfo = DD->getTypeSourceInfo(); |
| 176 | else if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(Attr.Dcl)) |
| 177 | TInfo = PD->getTypeSourceInfo(); |
| 178 | if (!TInfo) |
| 179 | continue; |
| 180 | |
| 181 | if (TInfo->getType().getObjCLifetime() == Qualifiers::OCL_Strong) { |
| 182 | Transaction Trans(TA); |
| 183 | TA.remove(Attr.Loc); |
| 184 | } |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | |
Argyrios Kyrtzidis | 280b4ad | 2011-11-06 18:58:23 +0000 | [diff] [blame^] | 189 | static void errorForGCAttrsOnNonObjC(MigrationContext &MigrateCtx) { |
| 190 | TransformActions &TA = MigrateCtx.Pass.TA; |
| 191 | |
| 192 | for (unsigned i = 0, e = MigrateCtx.GCAttrs.size(); i != e; ++i) { |
| 193 | MigrationContext::GCAttrOccurrence &Attr = MigrateCtx.GCAttrs[i]; |
| 194 | if (Attr.FullyMigratable && Attr.Dcl) { |
| 195 | if (Attr.ModifiedType.isNull()) |
| 196 | continue; |
| 197 | if (!Attr.ModifiedType->isObjCRetainableType()) { |
| 198 | TA.reportError("GC managed memory will become unmanaged in ARC", |
| 199 | Attr.Loc); |
| 200 | } |
| 201 | } |
| 202 | } |
| 203 | } |
| 204 | |
Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 205 | void GCAttrsTraverser::traverseTU(MigrationContext &MigrateCtx) { |
| 206 | GCAttrsCollector(MigrateCtx).TraverseDecl( |
| 207 | MigrateCtx.Pass.Ctx.getTranslationUnitDecl()); |
Argyrios Kyrtzidis | 280b4ad | 2011-11-06 18:58:23 +0000 | [diff] [blame^] | 208 | |
Argyrios Kyrtzidis | 17ac319 | 2011-11-06 18:58:17 +0000 | [diff] [blame] | 209 | clearRedundantStrongs(MigrateCtx); |
Argyrios Kyrtzidis | 280b4ad | 2011-11-06 18:58:23 +0000 | [diff] [blame^] | 210 | errorForGCAttrsOnNonObjC(MigrateCtx); |
Argyrios Kyrtzidis | 17ac319 | 2011-11-06 18:58:17 +0000 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | void MigrationContext::dumpGCAttrs() { |
Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 214 | llvm::errs() << "\n################\n"; |
Argyrios Kyrtzidis | 17ac319 | 2011-11-06 18:58:17 +0000 | [diff] [blame] | 215 | for (unsigned i = 0, e = GCAttrs.size(); i != e; ++i) { |
| 216 | GCAttrOccurrence &Attr = GCAttrs[i]; |
Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 217 | llvm::errs() << "KIND: " |
Argyrios Kyrtzidis | 17ac319 | 2011-11-06 18:58:17 +0000 | [diff] [blame] | 218 | << (Attr.Kind == GCAttrOccurrence::Strong ? "strong" : "weak"); |
Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 219 | llvm::errs() << "\nLOC: "; |
Argyrios Kyrtzidis | 17ac319 | 2011-11-06 18:58:17 +0000 | [diff] [blame] | 220 | Attr.Loc.dump(Pass.Ctx.getSourceManager()); |
Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 221 | llvm::errs() << "\nTYPE: "; |
| 222 | Attr.ModifiedType.dump(); |
| 223 | if (Attr.Dcl) { |
| 224 | llvm::errs() << "DECL:\n"; |
| 225 | Attr.Dcl->dump(); |
| 226 | } else { |
| 227 | llvm::errs() << "DECL: NONE"; |
| 228 | } |
| 229 | llvm::errs() << "\nMIGRATABLE: " << Attr.FullyMigratable; |
| 230 | llvm::errs() << "\n----------------\n"; |
| 231 | } |
| 232 | llvm::errs() << "\n################\n"; |
Argyrios Kyrtzidis | f38fa73 | 2011-11-06 18:58:03 +0000 | [diff] [blame] | 233 | } |