1 //===--- TransARCAssign.cpp - Tranformations 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 // makeAssignARCSafe: 11 // 12 // Add '__strong' where appropriate. 13 // 14 // for (id x in collection) { 15 // x = 0; 16 // } 17 // ----> 18 // for (__strong id x in collection) { 19 // x = 0; 20 // } 21 // 22 //===----------------------------------------------------------------------===// 23 24 #include "Transforms.h" 25 #include "Internals.h" 26 #include "clang/Sema/SemaDiagnostic.h" 27 28 using namespace clang; 29 using namespace arcmt; 30 using namespace trans; 31 using llvm::StringRef; 32 33 namespace { 34 35 class ARCAssignChecker : public RecursiveASTVisitor<ARCAssignChecker> { 36 MigrationPass &Pass; 37 llvm::DenseSet<VarDecl *> ModifiedVars; 38 39 public: ARCAssignChecker(MigrationPass & pass)40 ARCAssignChecker(MigrationPass &pass) : Pass(pass) { } 41 VisitBinaryOperator(BinaryOperator * Exp)42 bool VisitBinaryOperator(BinaryOperator *Exp) { 43 Expr *E = Exp->getLHS(); 44 SourceLocation OrigLoc = E->getExprLoc(); 45 SourceLocation Loc = OrigLoc; 46 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()); 47 if (declRef && isa<VarDecl>(declRef->getDecl())) { 48 ASTContext &Ctx = Pass.Ctx; 49 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(Ctx, &Loc); 50 if (IsLV != Expr::MLV_ConstQualified) 51 return true; 52 VarDecl *var = cast<VarDecl>(declRef->getDecl()); 53 if (var->isARCPseudoStrong()) { 54 Transaction Trans(Pass.TA); 55 if (Pass.TA.clearDiagnostic(diag::err_typecheck_arr_assign_enumeration, 56 Exp->getOperatorLoc())) { 57 if (!ModifiedVars.count(var)) { 58 TypeLoc TLoc = var->getTypeSourceInfo()->getTypeLoc(); 59 Pass.TA.insert(TLoc.getBeginLoc(), "__strong "); 60 ModifiedVars.insert(var); 61 } 62 } 63 } 64 } 65 66 return true; 67 } 68 }; 69 70 } // anonymous namespace 71 makeAssignARCSafe(MigrationPass & pass)72void trans::makeAssignARCSafe(MigrationPass &pass) { 73 ARCAssignChecker assignCheck(pass); 74 assignCheck.TraverseDecl(pass.Ctx.getTranslationUnitDecl()); 75 } 76