| 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 | |
| 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 | 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: &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(loc: TLoc.getBeginLoc(), text: "__strong "); |
| 62 | ModifiedVars.insert(var); |
| 63 | } |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | return true; |
| 69 | } |
| 70 | }; |
| 71 | |
| 72 | } // anonymous namespace |
| 73 | |
| 74 | void trans::makeAssignARCSafe(MigrationPass &pass) { |
| 75 | ARCAssignChecker assignCheck(pass); |
| 76 | assignCheck.TraverseDecl(pass.Ctx.getTranslationUnitDecl()); |
| 77 | } |
| 78 |