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1 //===--- TransUnusedInitDelegate.cpp - Transformations to ARC mode --------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 // Transformations:
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9 //===----------------------------------------------------------------------===//
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10 //
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11 // rewriteUnusedInitDelegate:
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12 //
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13 // Rewrites an unused result of calling a delegate initialization, to assigning
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14 // the result to self.
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15 // e.g
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16 // [self init];
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17 // ---->
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18 // self = [self init];
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19 //
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20 //===----------------------------------------------------------------------===//
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21
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22 #include "Transforms.h"
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23 #include "Internals.h"
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24 #include "clang/AST/ASTContext.h"
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25 #include "clang/Sema/SemaDiagnostic.h"
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26
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27 using namespace clang;
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28 using namespace arcmt;
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29 using namespace trans;
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30
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31 namespace {
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32
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33 class UnusedInitRewriter : public RecursiveASTVisitor<UnusedInitRewriter> {
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34 Stmt *Body;
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35 MigrationPass &Pass;
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36
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37 ExprSet Removables;
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38
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39 public:
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40 UnusedInitRewriter(MigrationPass &pass)
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41 : Body(nullptr), Pass(pass) { }
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42
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43 void transformBody(Stmt *body, Decl *ParentD) {
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44 Body = body;
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45 collectRemovables(body, Removables);
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46 TraverseStmt(body);
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47 }
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48
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49 bool VisitObjCMessageExpr(ObjCMessageExpr *ME) {
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50 if (ME->isDelegateInitCall() &&
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51 isRemovable(ME) &&
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52 Pass.TA.hasDiagnostic(diag::err_arc_unused_init_message,
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53 ME->getExprLoc())) {
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54 Transaction Trans(Pass.TA);
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55 Pass.TA.clearDiagnostic(diag::err_arc_unused_init_message,
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56 ME->getExprLoc());
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57 SourceRange ExprRange = ME->getSourceRange();
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58 Pass.TA.insert(ExprRange.getBegin(), "if (!(self = ");
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59 std::string retStr = ")) return ";
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60 retStr += getNilString(Pass);
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61 Pass.TA.insertAfterToken(ExprRange.getEnd(), retStr);
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62 }
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63 return true;
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64 }
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65
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66 private:
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67 bool isRemovable(Expr *E) const {
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68 return Removables.count(E);
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69 }
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70 };
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71
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72 } // anonymous namespace
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73
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74 void trans::rewriteUnusedInitDelegate(MigrationPass &pass) {
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75 BodyTransform<UnusedInitRewriter> trans(pass);
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76 trans.TraverseDecl(pass.Ctx.getTranslationUnitDecl());
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77 }
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