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78 lines
2.2 KiB
78 lines
2.2 KiB
//===--- TransUnusedInitDelegate.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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// Transformations:
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//===----------------------------------------------------------------------===//
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//
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// rewriteUnusedInitDelegate:
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//
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// Rewrites an unused result of calling a delegate initialization, to assigning
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// the result to self.
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// e.g
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// [self init];
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// ---->
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// self = [self init];
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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 UnusedInitRewriter : public RecursiveASTVisitor<UnusedInitRewriter> {
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Stmt *Body;
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MigrationPass &Pass;
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ExprSet Removables;
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public:
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UnusedInitRewriter(MigrationPass &pass)
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: Body(nullptr), Pass(pass) { }
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void transformBody(Stmt *body, Decl *ParentD) {
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Body = body;
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collectRemovables(body, Removables);
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TraverseStmt(body);
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}
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bool VisitObjCMessageExpr(ObjCMessageExpr *ME) {
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if (ME->isDelegateInitCall() &&
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isRemovable(ME) &&
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Pass.TA.hasDiagnostic(diag::err_arc_unused_init_message,
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ME->getExprLoc())) {
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Transaction Trans(Pass.TA);
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Pass.TA.clearDiagnostic(diag::err_arc_unused_init_message,
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ME->getExprLoc());
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SourceRange ExprRange = ME->getSourceRange();
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Pass.TA.insert(ExprRange.getBegin(), "if (!(self = ");
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std::string retStr = ")) return ";
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retStr += getNilString(Pass);
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Pass.TA.insertAfterToken(ExprRange.getEnd(), retStr);
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}
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return true;
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}
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private:
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bool isRemovable(Expr *E) const {
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return Removables.count(E);
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}
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};
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} // anonymous namespace
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void trans::rewriteUnusedInitDelegate(MigrationPass &pass) {
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BodyTransform<UnusedInitRewriter> trans(pass);
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trans.TraverseDecl(pass.Ctx.getTranslationUnitDecl());
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}
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