1//===--- TransARCAssign.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// 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/AST/ASTContext.h" 27#include "clang/Sema/SemaDiagnostic.h" 28 29using namespace clang; 30using namespace arcmt; 31using namespace trans; 32 33namespace { 34 35class ARCAssignChecker : public RecursiveASTVisitor<ARCAssignChecker> { 36 MigrationPass &Pass; 37 llvm::DenseSet<VarDecl *> ModifiedVars; 38 39public: 40 ARCAssignChecker(MigrationPass &pass) : Pass(pass) { } 41 42 bool VisitBinaryOperator(BinaryOperator *Exp) { 43 if (Exp->getType()->isDependentType()) 44 return true; 45 46 Expr *E = Exp->getLHS(); 47 SourceLocation OrigLoc = E->getExprLoc(); 48 SourceLocation Loc = OrigLoc; 49 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()); 50 if (declRef && isa<VarDecl>(declRef->getDecl())) { 51 ASTContext &Ctx = Pass.Ctx; 52 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(Ctx, &Loc); 53 if (IsLV != Expr::MLV_ConstQualified) 54 return true; 55 VarDecl *var = cast<VarDecl>(declRef->getDecl()); 56 if (var->isARCPseudoStrong()) { 57 Transaction Trans(Pass.TA); 58 if (Pass.TA.clearDiagnostic(diag::err_typecheck_arr_assign_enumeration, 59 Exp->getOperatorLoc())) { 60 if (!ModifiedVars.count(var)) { 61 TypeLoc TLoc = var->getTypeSourceInfo()->getTypeLoc(); 62 Pass.TA.insert(TLoc.getBeginLoc(), "__strong "); 63 ModifiedVars.insert(var); 64 } 65 } 66 } 67 } 68 69 return true; 70 } 71}; 72 73} // anonymous namespace 74 75void trans::makeAssignARCSafe(MigrationPass &pass) { 76 ARCAssignChecker assignCheck(pass); 77 assignCheck.TraverseDecl(pass.Ctx.getTranslationUnitDecl()); 78} 79