1 //===--- TransARCAssign.cpp - Tranformations to ARC mode ------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 // Add '__strong' where appropriate.
14 // for (id x in collection) {
18 // for (__strong id x in collection) {
22 //===----------------------------------------------------------------------===//
24 #include "Transforms.h"
25 #include "Internals.h"
26 #include "clang/Sema/SemaDiagnostic.h"
28 using namespace clang;
29 using namespace arcmt;
30 using namespace trans;
31 using llvm::StringRef;
35 class ARCAssignChecker : public RecursiveASTVisitor<ARCAssignChecker> {
37 llvm::DenseSet<VarDecl *> ModifiedVars;
40 ARCAssignChecker(MigrationPass &pass) : Pass(pass) { }
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)
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);
70 } // anonymous namespace
72 void trans::makeAssignARCSafe(MigrationPass &pass) {
73 ARCAssignChecker assignCheck(pass);
74 assignCheck.TraverseDecl(pass.Ctx.getTranslationUnitDecl());