1//===--- TransARCAssign.cpp - Transformations to ARC mode -----------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// makeAssignARCSafe: 10// 11// Add '__strong' where appropriate. 12// 13// for (id x in collection) { 14// x = 0; 15// } 16// ----> 17// for (__strong id x in collection) { 18// x = 0; 19// } 20// 21//===----------------------------------------------------------------------===// 22 23#include "Transforms.h" 24#include "Internals.h" 25#include "clang/AST/ASTContext.h" 26#include "clang/Sema/SemaDiagnostic.h" 27 28using namespace clang; 29using namespace arcmt; 30using namespace trans; 31 32namespace { 33 34class ARCAssignChecker : public RecursiveASTVisitor<ARCAssignChecker> { 35 MigrationPass &Pass; 36 llvm::DenseSet<VarDecl *> ModifiedVars; 37 38public: 39 ARCAssignChecker(MigrationPass &pass) : Pass(pass) { } 40 41 bool VisitBinaryOperator(BinaryOperator *Exp) { 42 if (Exp->getType()->isDependentType()) 43 return true; 44 45 Expr *E = Exp->getLHS(); 46 SourceLocation OrigLoc = E->getExprLoc(); 47 SourceLocation Loc = OrigLoc; 48 DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts()); 49 if (declRef && isa<VarDecl>(declRef->getDecl())) { 50 ASTContext &Ctx = Pass.Ctx; 51 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(Ctx, &Loc); 52 if (IsLV != Expr::MLV_ConstQualified) 53 return true; 54 VarDecl *var = cast<VarDecl>(declRef->getDecl()); 55 if (var->isARCPseudoStrong()) { 56 Transaction Trans(Pass.TA); 57 if (Pass.TA.clearDiagnostic(diag::err_typecheck_arr_assign_enumeration, 58 Exp->getOperatorLoc())) { 59 if (!ModifiedVars.count(var)) { 60 TypeLoc TLoc = var->getTypeSourceInfo()->getTypeLoc(); 61 Pass.TA.insert(TLoc.getBeginLoc(), "__strong "); 62 ModifiedVars.insert(var); 63 } 64 } 65 } 66 } 67 68 return true; 69 } 70}; 71 72} // anonymous namespace 73 74void trans::makeAssignARCSafe(MigrationPass &pass) { 75 ARCAssignChecker assignCheck(pass); 76 assignCheck.TraverseDecl(pass.Ctx.getTranslationUnitDecl()); 77} 78