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 32 namespace { 33 34 class ARCAssignChecker : public RecursiveASTVisitor<ARCAssignChecker> { 35 MigrationPass &Pass; 36 llvm::DenseSet<VarDecl *> ModifiedVars; 37 38 public: 39 ARCAssignChecker(MigrationPass &pass) : Pass(pass) { } 40 41 bool VisitBinaryOperator(BinaryOperator *Exp) { 42 Expr *E = Exp->getLHS(); 43 SourceLocation OrigLoc = E->getExprLoc(); 44 SourceLocation Loc = OrigLoc; 45 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()); 46 if (declRef && isa<VarDecl>(declRef->getDecl())) { 47 ASTContext &Ctx = Pass.Ctx; 48 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(Ctx, &Loc); 49 if (IsLV != Expr::MLV_ConstQualified) 50 return true; 51 VarDecl *var = cast<VarDecl>(declRef->getDecl()); 52 if (var->isARCPseudoStrong()) { 53 Transaction Trans(Pass.TA); 54 if (Pass.TA.clearDiagnostic(diag::err_typecheck_arr_assign_enumeration, 55 Exp->getOperatorLoc())) { 56 if (!ModifiedVars.count(var)) { 57 TypeLoc TLoc = var->getTypeSourceInfo()->getTypeLoc(); 58 Pass.TA.insert(TLoc.getBeginLoc(), "__strong "); 59 ModifiedVars.insert(var); 60 } 61 } 62 } 63 } 64 65 return true; 66 } 67 }; 68 69 } // anonymous namespace 70 71 void trans::makeAssignARCSafe(MigrationPass &pass) { 72 ARCAssignChecker assignCheck(pass); 73 assignCheck.TraverseDecl(pass.Ctx.getTranslationUnitDecl()); 74 } 75
