79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
//===--- TransUnusedInitDelegate.cpp - Transformations to ARC mode --------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
// Transformations:
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// rewriteUnusedInitDelegate:
|
|
//
|
|
// Rewrites an unused result of calling a delegate initialization, to assigning
|
|
// the result to self.
|
|
// e.g
|
|
// [self init];
|
|
// ---->
|
|
// self = [self init];
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "Transforms.h"
|
|
#include "Internals.h"
|
|
#include "clang/AST/ASTContext.h"
|
|
#include "clang/Sema/SemaDiagnostic.h"
|
|
|
|
using namespace clang;
|
|
using namespace arcmt;
|
|
using namespace trans;
|
|
|
|
namespace {
|
|
|
|
class UnusedInitRewriter : public RecursiveASTVisitor<UnusedInitRewriter> {
|
|
Stmt *Body;
|
|
MigrationPass &Pass;
|
|
|
|
ExprSet Removables;
|
|
|
|
public:
|
|
UnusedInitRewriter(MigrationPass &pass)
|
|
: Body(nullptr), Pass(pass) { }
|
|
|
|
void transformBody(Stmt *body, Decl *ParentD) {
|
|
Body = body;
|
|
collectRemovables(body, Removables);
|
|
TraverseStmt(body);
|
|
}
|
|
|
|
bool VisitObjCMessageExpr(ObjCMessageExpr *ME) {
|
|
if (ME->isDelegateInitCall() &&
|
|
isRemovable(ME) &&
|
|
Pass.TA.hasDiagnostic(diag::err_arc_unused_init_message,
|
|
ME->getExprLoc())) {
|
|
Transaction Trans(Pass.TA);
|
|
Pass.TA.clearDiagnostic(diag::err_arc_unused_init_message,
|
|
ME->getExprLoc());
|
|
SourceRange ExprRange = ME->getSourceRange();
|
|
Pass.TA.insert(ExprRange.getBegin(), "if (!(self = ");
|
|
std::string retStr = ")) return ";
|
|
retStr += getNilString(Pass);
|
|
Pass.TA.insertAfterToken(ExprRange.getEnd(), retStr);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
bool isRemovable(Expr *E) const {
|
|
return Removables.count(E);
|
|
}
|
|
};
|
|
|
|
} // anonymous namespace
|
|
|
|
void trans::rewriteUnusedInitDelegate(MigrationPass &pass) {
|
|
BodyTransform<UnusedInitRewriter> trans(pass);
|
|
trans.TraverseDecl(pass.Ctx.getTranslationUnitDecl());
|
|
}
|