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//===--- TransARCAssign.cpp - Transformations to ARC mode -----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// makeAssignARCSafe:
//
// Add '__strong' where appropriate.
//
// for (id x in collection) {
// x = 0;
// }
// ---->
// for (__strong id x in collection) {
// x = 0;
// }
//
//===----------------------------------------------------------------------===//
#include "Transforms.h"
#include "Internals.h"
#include "clang/AST/ASTContext.h"
#include "clang/Sema/SemaDiagnostic.h"
using namespace clang;
using namespace arcmt;
using namespace trans;
namespace {
class ARCAssignChecker : public RecursiveASTVisitor<ARCAssignChecker> {
MigrationPass &Pass;
llvm::DenseSet<VarDecl *> ModifiedVars;
public:
ARCAssignChecker(MigrationPass &pass) : Pass(pass) { }
bool VisitBinaryOperator(BinaryOperator *Exp) {
if (Exp->getType()->isDependentType())
return true;
Expr *E = Exp->getLHS();
SourceLocation OrigLoc = E->getExprLoc();
SourceLocation Loc = OrigLoc;
DeclRefExpr *declRef = dyn_cast<DeclRefExpr>(E->IgnoreParenCasts());
if (declRef && isa<VarDecl>(declRef->getDecl())) {
ASTContext &Ctx = Pass.Ctx;
Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(Ctx, &Loc);
if (IsLV != Expr::MLV_ConstQualified)
return true;
VarDecl *var = cast<VarDecl>(declRef->getDecl());
if (var->isARCPseudoStrong()) {
Transaction Trans(Pass.TA);
if (Pass.TA.clearDiagnostic(diag::err_typecheck_arr_assign_enumeration,
Exp->getOperatorLoc())) {
if (!ModifiedVars.count(var)) {
TypeLoc TLoc = var->getTypeSourceInfo()->getTypeLoc();
Pass.TA.insert(TLoc.getBeginLoc(), "__strong ");
ModifiedVars.insert(var);
}
}
}
}
return true;
}
};
} // anonymous namespace
void trans::makeAssignARCSafe(MigrationPass &pass) {
ARCAssignChecker assignCheck(pass);
assignCheck.TraverseDecl(pass.Ctx.getTranslationUnitDecl());
}
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