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//===--- TransAPIUses.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
//
//===----------------------------------------------------------------------===//
//
// checkAPIUses:
//
// Emits error/fix with some API uses that are obsolete or not safe in ARC mode:
//
// - NSInvocation's [get/set]ReturnValue and [get/set]Argument are only safe
// with __unsafe_unretained objects.
// - Calling -zone gets replaced with 'nil'.
//
//===----------------------------------------------------------------------===//
#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 APIChecker : public RecursiveASTVisitor<APIChecker> {
MigrationPass &Pass;
Selector getReturnValueSel, setReturnValueSel;
Selector getArgumentSel, setArgumentSel;
Selector zoneSel;
public:
APIChecker(MigrationPass &pass) : Pass(pass) {
SelectorTable &sels = Pass.Ctx.Selectors;
IdentifierTable &ids = Pass.Ctx.Idents;
getReturnValueSel = sels.getUnarySelector(&ids.get("getReturnValue"));
setReturnValueSel = sels.getUnarySelector(&ids.get("setReturnValue"));
IdentifierInfo *selIds[2];
selIds[0] = &ids.get("getArgument");
selIds[1] = &ids.get("atIndex");
getArgumentSel = sels.getSelector(2, selIds);
selIds[0] = &ids.get("setArgument");
setArgumentSel = sels.getSelector(2, selIds);
zoneSel = sels.getNullarySelector(&ids.get("zone"));
}
bool VisitObjCMessageExpr(ObjCMessageExpr *E) {
// NSInvocation.
if (E->isInstanceMessage() &&
E->getReceiverInterface() &&
E->getReceiverInterface()->getName() == "NSInvocation") {
StringRef selName;
if (E->getSelector() == getReturnValueSel)
selName = "getReturnValue";
else if (E->getSelector() == setReturnValueSel)
selName = "setReturnValue";
else if (E->getSelector() == getArgumentSel)
selName = "getArgument";
else if (E->getSelector() == setArgumentSel)
selName = "setArgument";
else
return true;
Expr *parm = E->getArg(0)->IgnoreParenCasts();
QualType pointee = parm->getType()->getPointeeType();
if (pointee.isNull())
return true;
if (pointee.getObjCLifetime() > Qualifiers::OCL_ExplicitNone)
Pass.TA.report(parm->getBeginLoc(),
diag::err_arcmt_nsinvocation_ownership,
parm->getSourceRange())
<< selName;
return true;
}
// -zone.
if (E->isInstanceMessage() &&
E->getInstanceReceiver() &&
E->getSelector() == zoneSel &&
Pass.TA.hasDiagnostic(diag::err_unavailable,
diag::err_unavailable_message,
E->getSelectorLoc(0))) {
// Calling -zone is meaningless in ARC, change it to nil.
Transaction Trans(Pass.TA);
Pass.TA.clearDiagnostic(diag::err_unavailable,
diag::err_unavailable_message,
E->getSelectorLoc(0));
Pass.TA.replace(E->getSourceRange(), getNilString(Pass));
}
return true;
}
};
} // anonymous namespace
void trans::checkAPIUses(MigrationPass &pass) {
APIChecker(pass).TraverseDecl(pass.Ctx.getTranslationUnitDecl());
}
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