clang/lib/ARCMigrate/TransAPIUses.cpp

   1 //===--- TransAPIUses.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 // checkAPIUses:
  10 //
  11 // Emits error/fix with some API uses that are obsolete or not safe in ARC mode:
  12 //
  13 // - NSInvocation's [get/set]ReturnValue and [get/set]Argument are only safe
  14 //   with __unsafe_unretained objects.
  15 // - Calling -zone gets replaced with 'nil'.
  16 //
  17 //===----------------------------------------------------------------------===//
  18
  19 #include "Transforms.h"
  20 #include "Internals.h"
  21 #include "clang/AST/ASTContext.h"
  22 #include "clang/Sema/SemaDiagnostic.h"
  23
  24 using namespace clang;
  25 using namespace arcmt;
  26 using namespace trans;
  27
  28 namespace {
  29
  30 class APIChecker : public RecursiveASTVisitor<APIChecker> {
  31   MigrationPass &Pass;
  32
  33   Selector getReturnValueSel, setReturnValueSel;
  34   Selector getArgumentSel, setArgumentSel;
  35
  36   Selector zoneSel;
  37 public:
  38   APIChecker(MigrationPass &pass) : Pass(pass) {
  39     SelectorTable &sels = Pass.Ctx.Selectors;
  40     IdentifierTable &ids = Pass.Ctx.Idents;
  41     getReturnValueSel = sels.getUnarySelector(&ids.get("getReturnValue"));
  42     setReturnValueSel = sels.getUnarySelector(&ids.get("setReturnValue"));
  43
  44     IdentifierInfo *selIds[2];
  45     selIds[0] = &ids.get("getArgument");
  46     selIds[1] = &ids.get("atIndex");
  47     getArgumentSel = sels.getSelector(2, selIds);
  48     selIds[0] = &ids.get("setArgument");
  49     setArgumentSel = sels.getSelector(2, selIds);
  50
  51     zoneSel = sels.getNullarySelector(&ids.get("zone"));
  52   }
  53
  54   bool VisitObjCMessageExpr(ObjCMessageExpr *E) {
  55     // NSInvocation.
  56     if (E->isInstanceMessage() &&
  57         E->getReceiverInterface() &&
  58         E->getReceiverInterface()->getName() == "NSInvocation") {
  59       StringRef selName;
  60       if (E->getSelector() == getReturnValueSel)
  61         selName = "getReturnValue";
  62       else if (E->getSelector() == setReturnValueSel)
  63         selName = "setReturnValue";
  64       else if (E->getSelector() == getArgumentSel)
  65         selName = "getArgument";
  66       else if (E->getSelector() == setArgumentSel)
  67         selName = "setArgument";
  68       else
  69         return true;
  70
  71       Expr *parm = E->getArg(0)->IgnoreParenCasts();
  72       QualType pointee = parm->getType()->getPointeeType();
  73       if (pointee.isNull())
  74         return true;
  75
  76       if (pointee.getObjCLifetime() > Qualifiers::OCL_ExplicitNone)
  77         Pass.TA.report(parm->getBeginLoc(),
  78                        diag::err_arcmt_nsinvocation_ownership,
  79                        parm->getSourceRange())
  80             << selName;
  81
  82       return true;
  83     }
  84
  85     // -zone.
  86     if (E->isInstanceMessage() &&
  87         E->getInstanceReceiver() &&
  88         E->getSelector() == zoneSel &&
  89         Pass.TA.hasDiagnostic(diag::err_unavailable,
  90                               diag::err_unavailable_message,
  91                               E->getSelectorLoc(0))) {
  92       // Calling -zone is meaningless in ARC, change it to nil.
  93       Transaction Trans(Pass.TA);
  94       Pass.TA.clearDiagnostic(diag::err_unavailable,
  95                               diag::err_unavailable_message,
  96                               E->getSelectorLoc(0));
  97       Pass.TA.replace(E->getSourceRange(), getNilString(Pass));
  98     }
  99     return true;
 100   }
 101 };
 102
 103 } // anonymous namespace
 104
 105 void trans::checkAPIUses(MigrationPass &pass) {
 106   APIChecker(pass).TraverseDecl(pass.Ctx.getTranslationUnitDecl());
 107 }