Wizard created this revision.
Herald added subscribers: cfe-commits, mgorny, klimek.
Repository:
rCTE Clang Tools Extra
https://reviews.llvm.org/D40528
Files:
clang-tidy/objc/AvoidNserrorInitCheck.cpp
clang-tidy/objc/AvoidNserrorInitCheck.h
clang-tidy/objc/CMakeLists.txt
clang-tidy/objc/ObjCTidyModule.cpp
docs/ReleaseNotes.rst
docs/clang-tidy/checks/list.rst
docs/clang-tidy/checks/objc-avoid-nserror-init.rst
test/clang-tidy/objc-avoid-nserror-init.m
Index: test/clang-tidy/objc-avoid-nserror-init.m
===================================================================
--- /dev/null
+++ test/clang-tidy/objc-avoid-nserror-init.m
@@ -0,0 +1,12 @@
+// RUN: %check_clang_tidy %s objc-avoid-nserror-init %t
+@interface NSError
++ (instancetype)alloc;
+- (instancetype)init;
+@end
+
+@implementation foo
+- (void)bar {
+ NSError *error = [[NSError alloc] init];
+ // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: use errorWithDomain:code:userInfo: to create a new NSError [objc-avoid-nserror-init]
+}
+@end
Index: docs/clang-tidy/checks/objc-avoid-nserror-init.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/objc-avoid-nserror-init.rst
@@ -0,0 +1,13 @@
+.. title:: clang-tidy - objc-avoid-nserror-init
+
+objc-avoid-nserror-init
+=======================
+
+This check will find out improper initialization of NSError objects.
+
+According to Apple developer document, we should always use factory method
+``errorWithDomain:code:userInfo:`` to create new NSError objects instead
+of ``[NSError alloc] init]``. Otherwise it will lead to a warning message
+during compilation in Xcode.
+
+The corresponding information about NSError creation: https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ErrorHandlingCocoa/CreateCustomizeNSError/CreateCustomizeNSError.html
\ No newline at end of file
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -174,6 +174,7 @@
modernize-use-using
mpi-buffer-deref
mpi-type-mismatch
+ objc-avoid-nserror-init
objc-avoid-spinlock
objc-forbidden-subclassing
objc-property-declaration
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -57,6 +57,11 @@
Improvements to clang-tidy
--------------------------
+- New `objc-avoid-nserror-init
+ <http://clang.llvm.org/extra/clang-tidy/checks/objc-avoid-nserror-init.html>`_ check
+
+ Add new check to detect the use of [NSError init].
+
- New `objc-avoid-spinlock
<http://clang.llvm.org/extra/clang-tidy/checks/objc-avoid-spinlock.html>`_ check
Index: clang-tidy/objc/ObjCTidyModule.cpp
===================================================================
--- clang-tidy/objc/ObjCTidyModule.cpp
+++ clang-tidy/objc/ObjCTidyModule.cpp
@@ -10,6 +10,7 @@
#include "../ClangTidy.h"
#include "../ClangTidyModule.h"
#include "../ClangTidyModuleRegistry.h"
+#include "AvoidNserrorInitCheck.h"
#include "AvoidSpinlockCheck.h"
#include "ForbiddenSubclassingCheck.h"
#include "PropertyDeclarationCheck.h"
@@ -23,6 +24,8 @@
class ObjCModule : public ClangTidyModule {
public:
void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
+ CheckFactories.registerCheck<AvoidNserrorInitCheck>(
+ "objc-avoid-nserror-init");
CheckFactories.registerCheck<AvoidSpinlockCheck>(
"objc-avoid-spinlock");
CheckFactories.registerCheck<ForbiddenSubclassingCheck>(
Index: clang-tidy/objc/CMakeLists.txt
===================================================================
--- clang-tidy/objc/CMakeLists.txt
+++ clang-tidy/objc/CMakeLists.txt
@@ -1,6 +1,7 @@
set(LLVM_LINK_COMPONENTS support)
add_clang_library(clangTidyObjCModule
+ AvoidNserrorInitCheck.cpp
AvoidSpinlockCheck.cpp
ForbiddenSubclassingCheck.cpp
ObjCTidyModule.cpp
Index: clang-tidy/objc/AvoidNserrorInitCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/objc/AvoidNserrorInitCheck.h
@@ -0,0 +1,36 @@
+//===--- AvoidNserrorInitCheck.h - clang-tidy--------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_OBJC_AVOIDNSERRORINITCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_OBJC_AVOIDNSERRORINITCHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace objc {
+
+/// Finds usages of [NSSError init]. It is not the proper way of creating
+/// NSError. errorWithDomain:code:userInfo: should be used instead.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/objc-avoid-nserror-init.html
+class AvoidNserrorInitCheck : public ClangTidyCheck {
+ public:
+ AvoidNserrorInitCheck(StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context) {}
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace objc
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_OBJC_AVOIDNSERRORINITCHECK_H
Index: clang-tidy/objc/AvoidNserrorInitCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/objc/AvoidNserrorInitCheck.cpp
@@ -0,0 +1,36 @@
+//===--- AvoidNserrorInitCheck.cpp - clang-tidy----------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "AvoidNserrorInitCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace objc {
+
+void AvoidNserrorInitCheck::registerMatchers(MatchFinder *Finder) {
+ Finder->addMatcher(objcMessageExpr(hasSelector("init"),
+ hasReceiverType(asString("NSError *")))
+ .bind("nserrorInit"),
+ this);
+}
+
+void AvoidNserrorInitCheck::check(const MatchFinder::MatchResult &Result) {
+ const auto *MatchedExpr =
+ Result.Nodes.getNodeAs<ObjCMessageExpr>("nserrorInit");
+ diag(MatchedExpr->getLocStart(),
+ "use errorWithDomain:code:userInfo: to create a new NSError");
+}
+
+} // namespace objc
+} // namespace tidy
+} // namespace clang
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