murrayc updated this revision to Diff 62355.
murrayc marked an inline comment as done.
murrayc added a comment.
Same as previous patch, but with a tiny suggested whitespace corretion.
http://reviews.llvm.org/D20857
Files:
clang-tidy/modernize/CMakeLists.txt
clang-tidy/modernize/ExplicitOperatorBoolCheck.cpp
clang-tidy/modernize/ExplicitOperatorBoolCheck.h
clang-tidy/modernize/ModernizeTidyModule.cpp
docs/ReleaseNotes.rst
docs/clang-tidy/checks/list.rst
docs/clang-tidy/checks/modernize-explicit-operator-bool.rst
test/clang-tidy/modernize-explicit-operator-bool-void-pointer.cpp
test/clang-tidy/modernize-explicit-operator-bool.cpp
Index: test/clang-tidy/modernize-explicit-operator-bool.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/modernize-explicit-operator-bool.cpp
@@ -0,0 +1,19 @@
+// RUN: %check_clang_tidy %s modernize-explicit-operator-bool %t -- -- -std=c++11
+
+// This should trigger the check:
+class SomethingBad {
+ operator bool() const {
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: operator bool declaration is not explicit [modernize-explicit-operator-bool]
+ return something != 0;
+ }
+
+ int something = 0;
+};
+
+class SomethingGood {
+ explicit operator bool() const {
+ return something != 0;
+ }
+
+ int something = 0;
+};
Index: test/clang-tidy/modernize-explicit-operator-bool-void-pointer.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/modernize-explicit-operator-bool-void-pointer.cpp
@@ -0,0 +1,46 @@
+// RUN: %check_clang_tidy %s modernize-explicit-operator-bool %t -- -- -std=c++11
+
+// This should trigger the check:
+class SomethingBad {
+ operator const void *() const {
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: implicit operator const void* declaration should probably be explicit operator bool [modernize-explicit-operator-bool]
+ return reinterpret_cast<void *>(something != 0);
+ }
+
+ int something = 0;
+};
+
+class SomethingGood {
+ // Note: Use modernize-explicit-operator-bool to check for implicit operator bool.
+ explicit operator bool() const {
+ return something != 0;
+ }
+
+ int something = 0;
+};
+
+class SomethingGoodExplicitConstVoidPtr {
+ explicit operator const void *() const {
+ return &something;
+ }
+
+ const int something = 0;
+};
+
+class SomethingGoodExplicitNonConstVoidPtr {
+ explicit operator void *() {
+ return &something;
+ }
+
+ int something = 0;
+};
+
+class SomethingGoodNonConstVoidPtr {
+ // A non-const void* is unlikely to to be meant as operator bool before C++11
+ // let us use explicit.
+ operator void *() {
+ return &something;
+ }
+
+ int something = 0;
+};
Index: docs/clang-tidy/checks/modernize-explicit-operator-bool.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/modernize-explicit-operator-bool.rst
@@ -0,0 +1,28 @@
+.. title:: clang-tidy - modernize-explicit-operator-bool
+
+modernize-explicit-operator-bool
+================================
+
+This check finds implicit ``operator bool`` overloads and inserts the
+``explicit`` keyword, which is available since C++11.
+
+Without the ``explicit`` keyword, the implicit ``bool`` overload can allow
+objects to be compared accidentally. For instance, even when objects `a` and
+`b` have no ``operator ==`` overloads, an implicit ``operator bool`` would allow
+`a == b` to compile because both `a` and `b` can be implictly converted to
+``bool``.
+
+This check also finds implicit ``operator const void*`` overloads. These were
+often used before C++11 to avoid implicit conversions to ``bool`` when providing
+an ``operator bool`` overload.
+
+To disable the check for ``operator const void*`` overloads, you may set
+The :option:`WarnOnOperatorVoidPointer` option to 1.
+
+.. code-block:: c++
+
+ operator bool () const;
+
+ // becomes
+
+ explicit operator bool () const;
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -93,6 +93,7 @@
misc-virtual-near-miss
modernize-avoid-bind
modernize-deprecated-headers
+ modernize-explicit-operator-bool
modernize-loop-convert
modernize-make-shared
modernize-make-unique
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -204,6 +204,13 @@
Replaces C standard library headers with their C++ alternatives.
+- New `modernize-explicit-operator-bool
+ <http://clang.llvm.org/extra/clang-tidy/checks/modernize-explicit-operator-bool.html>`_ check
+
+ Adds the ``explicit`` keyword to ``operator bool`` overloads.
+ Also finds ``operator const void*`` overloads, which should often be
+ ``explicit operator bool`` overloads.
+
- New `modernize-make-shared
<http://clang.llvm.org/extra/clang-tidy/checks/modernize-make-shared.html>`_ check
Index: clang-tidy/modernize/ModernizeTidyModule.cpp
===================================================================
--- clang-tidy/modernize/ModernizeTidyModule.cpp
+++ clang-tidy/modernize/ModernizeTidyModule.cpp
@@ -12,6 +12,7 @@
#include "../ClangTidyModuleRegistry.h"
#include "AvoidBindCheck.h"
#include "DeprecatedHeadersCheck.h"
+#include "ExplicitOperatorBoolCheck.h"
#include "LoopConvertCheck.h"
#include "MakeSharedCheck.h"
#include "MakeUniqueCheck.h"
@@ -41,6 +42,8 @@
"modernize-avoid-bind");
CheckFactories.registerCheck<DeprecatedHeadersCheck>(
"modernize-deprecated-headers");
+ CheckFactories.registerCheck<ExplicitOperatorBoolCheck>(
+ "modernize-explicit-operator-bool");
CheckFactories.registerCheck<LoopConvertCheck>("modernize-loop-convert");
CheckFactories.registerCheck<MakeSharedCheck>("modernize-make-shared");
CheckFactories.registerCheck<MakeUniqueCheck>("modernize-make-unique");
Index: clang-tidy/modernize/ExplicitOperatorBoolCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/modernize/ExplicitOperatorBoolCheck.h
@@ -0,0 +1,41 @@
+//===--- ExplicitOperatorBoolCheck.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_MODERNIZE_EXPLICIT_OPERATOR_BOOL_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_EXPLICIT_OPERATOR_BOOL_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+/// This check finds implicit operator bool overloads and inserts the explicit
+/// keyword, which is available since C++11.
+/// It also finds implicit operator const void* overloads, which should often be
+/// explicit operator bool overloads.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/modernize-explicit-operator-bool.html
+class ExplicitOperatorBoolCheck : public ClangTidyCheck {
+public:
+ ExplicitOperatorBoolCheck(StringRef Name, ClangTidyContext *Context);
+ void storeOptions(ClangTidyOptions::OptionMap &Opt) override;
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+
+private:
+ const bool WarnOnOperatorVoidPointer;
+};
+
+} // namespace modernize
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_EXPLICIT_OPERATOR_BOOL_H
Index: clang-tidy/modernize/ExplicitOperatorBoolCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/modernize/ExplicitOperatorBoolCheck.cpp
@@ -0,0 +1,83 @@
+//===--- ExplicitOperatorBoolCheck.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 "ExplicitOperatorBoolCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace modernize {
+
+ExplicitOperatorBoolCheck::ExplicitOperatorBoolCheck(StringRef Name,
+ ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context),
+ WarnOnOperatorVoidPointer(Options.get("WarnOnOperatorVoidPointer", 1) !=
+ 0) {}
+
+void ExplicitOperatorBoolCheck::storeOptions(
+ ClangTidyOptions::OptionMap &Opts) {
+ Options.store(Opts, "WarnOnOperatorVoidPointer", WarnOnOperatorVoidPointer);
+}
+
+void ExplicitOperatorBoolCheck::registerMatchers(MatchFinder *Finder) {
+ // Use of the explicit keyword with operator overloads requires C++11 or
+ // later.
+ if (!getLangOpts().CPlusPlus11)
+ return;
+
+ Finder->addMatcher(
+ cxxConversionDecl(returns(booleanType()), unless(isExplicit()))
+ .bind("operator-bool"),
+ this);
+
+ if (WarnOnOperatorVoidPointer) {
+ Finder->addMatcher(cxxConversionDecl(returns(pointerType(pointee(
+ isConstQualified(), voidType()))),
+ unless(isExplicit()))
+ .bind("operator-void-pointer"),
+ this);
+ }
+}
+
+void ExplicitOperatorBoolCheck::check(const MatchFinder::MatchResult &Result) {
+ if (const auto *MatchedDecl =
+ Result.Nodes.getNodeAs<CXXConversionDecl>("operator-bool")) {
+ diag(MatchedDecl->getLocation(),
+ "operator bool declaration is not explicit")
+ << FixItHint::CreateInsertion(MatchedDecl->getLocation(), "explicit ");
+ } else if (const auto *MatchedDecl =
+ Result.Nodes.getNodeAs<CXXConversionDecl>(
+ "operator-void-pointer")) {
+ diag(MatchedDecl->getLocation(),
+ "implicit operator const void* declaration should "
+ "probably be explicit operator bool");
+
+ // FIXME: This tries to change the type and add explicit, but
+ // MatchedDecl->getTypeSpecStartLoc() gets the start of void, not the start
+ // of const, in const void*. We would need something like
+ // getConversionTypeStartLoc().
+ // const auto Type = MatchedDecl->getConversionType().
+ // const auto OldRange = CharSourceRange::getTokenRange(
+ // MatchedDecl->getTypeSpecStartLoc(),
+ // MatchedDecl->getTypeSpecStartLoc().getLocWithOffset(Type.getAsString().size()));
+ // diag(MatchedDecl->getLocation(),
+ // "implicit operator void* declaration should probably be explicit
+ // operator
+ // bool")
+ // << FixItHint::CreateReplacement(OldRange, "bool")
+ // << FixItHint::CreateInsertion(MatchedDecl->getLocStart(), "explicit ");
+ }
+}
+
+} // namespace modernize
+} // namespace tidy
+} // namespace clang
Index: clang-tidy/modernize/CMakeLists.txt
===================================================================
--- clang-tidy/modernize/CMakeLists.txt
+++ clang-tidy/modernize/CMakeLists.txt
@@ -3,6 +3,7 @@
add_clang_library(clangTidyModernizeModule
AvoidBindCheck.cpp
DeprecatedHeadersCheck.cpp
+ ExplicitOperatorBoolCheck.cpp
LoopConvertCheck.cpp
LoopConvertUtils.cpp
MakeSmartPtrCheck.cpp
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