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108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
//===--- TransAPIUses.cpp - Transformations to ARC mode -------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// checkAPIUses:
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//
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// Emits error/fix with some API uses that are obsolete or not safe in ARC mode:
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//
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// - NSInvocation's [get/set]ReturnValue and [get/set]Argument are only safe
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// with __unsafe_unretained objects.
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// - Calling -zone gets replaced with 'nil'.
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//
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//===----------------------------------------------------------------------===//
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#include "Transforms.h"
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#include "Internals.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/Sema/SemaDiagnostic.h"
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using namespace clang;
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using namespace arcmt;
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using namespace trans;
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namespace {
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class APIChecker : public RecursiveASTVisitor<APIChecker> {
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MigrationPass &Pass;
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Selector getReturnValueSel, setReturnValueSel;
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Selector getArgumentSel, setArgumentSel;
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Selector zoneSel;
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public:
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APIChecker(MigrationPass &pass) : Pass(pass) {
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SelectorTable &sels = Pass.Ctx.Selectors;
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IdentifierTable &ids = Pass.Ctx.Idents;
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getReturnValueSel = sels.getUnarySelector(&ids.get("getReturnValue"));
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setReturnValueSel = sels.getUnarySelector(&ids.get("setReturnValue"));
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IdentifierInfo *selIds[2];
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selIds[0] = &ids.get("getArgument");
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selIds[1] = &ids.get("atIndex");
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getArgumentSel = sels.getSelector(2, selIds);
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selIds[0] = &ids.get("setArgument");
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setArgumentSel = sels.getSelector(2, selIds);
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zoneSel = sels.getNullarySelector(&ids.get("zone"));
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}
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bool VisitObjCMessageExpr(ObjCMessageExpr *E) {
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// NSInvocation.
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if (E->isInstanceMessage() &&
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E->getReceiverInterface() &&
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E->getReceiverInterface()->getName() == "NSInvocation") {
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StringRef selName;
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if (E->getSelector() == getReturnValueSel)
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selName = "getReturnValue";
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else if (E->getSelector() == setReturnValueSel)
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selName = "setReturnValue";
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else if (E->getSelector() == getArgumentSel)
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selName = "getArgument";
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else if (E->getSelector() == setArgumentSel)
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selName = "setArgument";
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else
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return true;
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Expr *parm = E->getArg(0)->IgnoreParenCasts();
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QualType pointee = parm->getType()->getPointeeType();
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if (pointee.isNull())
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return true;
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if (pointee.getObjCLifetime() > Qualifiers::OCL_ExplicitNone)
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Pass.TA.report(parm->getBeginLoc(),
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diag::err_arcmt_nsinvocation_ownership,
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parm->getSourceRange())
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<< selName;
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return true;
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}
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// -zone.
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if (E->isInstanceMessage() &&
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E->getInstanceReceiver() &&
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E->getSelector() == zoneSel &&
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Pass.TA.hasDiagnostic(diag::err_unavailable,
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diag::err_unavailable_message,
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E->getSelectorLoc(0))) {
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// Calling -zone is meaningless in ARC, change it to nil.
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Transaction Trans(Pass.TA);
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Pass.TA.clearDiagnostic(diag::err_unavailable,
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diag::err_unavailable_message,
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E->getSelectorLoc(0));
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Pass.TA.replace(E->getSourceRange(), getNilString(Pass));
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}
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return true;
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}
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};
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} // anonymous namespace
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void trans::checkAPIUses(MigrationPass &pass) {
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APIChecker(pass).TraverseDecl(pass.Ctx.getTranslationUnitDecl());
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}
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