Argyrios Kyrtzidis | 7196d06 | 2011-06-21 20:20:39 +0000 | [diff] [blame^] | 1 | //===--- TransUnusedInitDelegate.cpp - Tranformations to ARC mode ---------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // Transformations: |
| 10 | //===----------------------------------------------------------------------===// |
| 11 | // |
| 12 | // rewriteUnusedInitDelegate: |
| 13 | // |
| 14 | // Rewrites an unused result of calling a delegate initialization, to assigning |
| 15 | // the result to self. |
| 16 | // e.g |
| 17 | // [self init]; |
| 18 | // ----> |
| 19 | // self = [self init]; |
| 20 | // |
| 21 | //===----------------------------------------------------------------------===// |
| 22 | |
| 23 | #include "Transforms.h" |
| 24 | #include "Internals.h" |
| 25 | #include "clang/Sema/SemaDiagnostic.h" |
| 26 | |
| 27 | using namespace clang; |
| 28 | using namespace arcmt; |
| 29 | using namespace trans; |
| 30 | using llvm::StringRef; |
| 31 | |
| 32 | namespace { |
| 33 | |
| 34 | class UnusedInitRewriter : public RecursiveASTVisitor<UnusedInitRewriter> { |
| 35 | Decl *Dcl; |
| 36 | Stmt *Body; |
| 37 | MigrationPass &Pass; |
| 38 | |
| 39 | ExprSet Removables; |
| 40 | |
| 41 | public: |
| 42 | UnusedInitRewriter(Decl *D, MigrationPass &pass) |
| 43 | : Dcl(D), Body(0), Pass(pass) { } |
| 44 | |
| 45 | void transformBody(Stmt *body) { |
| 46 | Body = body; |
| 47 | collectRemovables(body, Removables); |
| 48 | TraverseStmt(body); |
| 49 | } |
| 50 | |
| 51 | bool VisitObjCMessageExpr(ObjCMessageExpr *ME) { |
| 52 | if (ME->isDelegateInitCall() && |
| 53 | isRemovable(ME) && |
| 54 | Pass.TA.hasDiagnostic(diag::err_arc_unused_init_message, |
| 55 | ME->getExprLoc())) { |
| 56 | Transaction Trans(Pass.TA); |
| 57 | Pass.TA.clearDiagnostic(diag::err_arc_unused_init_message, |
| 58 | ME->getExprLoc()); |
| 59 | Pass.TA.insert(ME->getExprLoc(), "self = "); |
| 60 | } |
| 61 | return true; |
| 62 | } |
| 63 | |
| 64 | private: |
| 65 | bool isRemovable(Expr *E) const { |
| 66 | return Removables.count(E); |
| 67 | } |
| 68 | }; |
| 69 | |
| 70 | } // anonymous namespace |
| 71 | |
| 72 | void trans::rewriteUnusedInitDelegate(MigrationPass &pass) { |
| 73 | BodyTransform<UnusedInitRewriter> trans(pass); |
| 74 | trans.TraverseDecl(pass.Ctx.getTranslationUnitDecl()); |
| 75 | } |