llvm/clang/lib/ARCMigrate/TransEmptyStatementsAndDealloc.cpp

//===-- TransEmptyStatementsAndDealloc.cpp - Transformations to ARC mode --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// removeEmptyStatementsAndDealloc:
//
// Removes empty statements that are leftovers from previous transformations.
// e.g for
//
//  [x retain];
//
// removeRetainReleaseDealloc will leave an empty ";" that removeEmptyStatements
// will remove.
//
//===----------------------------------------------------------------------===//

#include "Transforms.h"
#include "Internals.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/StmtVisitor.h"
#include "clang/Basic/SourceManager.h"

usingnamespaceclang;
usingnamespacearcmt;
usingnamespacetrans;

static bool isEmptyARCMTMacroStatement(NullStmt *S,
                                       std::vector<SourceLocation> &MacroLocs,
                                       ASTContext &Ctx) { … }

namespace {

/// Returns true if the statement became empty due to previous
/// transformations.
class EmptyChecker : public StmtVisitor<EmptyChecker, bool> { … };

class EmptyStatementsRemover :
                            public RecursiveASTVisitor<EmptyStatementsRemover> { … };

} // anonymous namespace

static bool isBodyEmpty(CompoundStmt *body, ASTContext &Ctx,
                        std::vector<SourceLocation> &MacroLocs) { … }

static void cleanupDeallocOrFinalize(MigrationPass &pass) { … }

void trans::removeEmptyStatementsAndDeallocFinalize(MigrationPass &pass) { … }