DNS320 updated this revision to Diff 346360.
DNS320 added a comment.
I updated the check according to the last review.
It ignores now do-while statements which are inside a macro and have a false
condition. (false condition part was taken from bugprone-terminating-continue
<https://clang.llvm.org/extra/clang-tidy/checks/bugprone-terminating-continue.html>)
Tests were added and the check documentation has now a hint about ignoring
do-while statements in macros.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D102576/new/
https://reviews.llvm.org/D102576
Files:
clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidDoWhileCheck.cpp
clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidDoWhileCheck.h
clang-tools-extra/clang-tidy/cppcoreguidelines/CMakeLists.txt
clang-tools-extra/clang-tidy/cppcoreguidelines/CppCoreGuidelinesTidyModule.cpp
clang-tools-extra/docs/ReleaseNotes.rst
clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-avoid-do-while.rst
clang-tools-extra/docs/clang-tidy/checks/list.rst
clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-avoid-do-while.cpp
Index: clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-avoid-do-while.cpp
===================================================================
--- /dev/null
+++ clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-avoid-do-while.cpp
@@ -0,0 +1,87 @@
+// RUN: %check_clang_tidy %s cppcoreguidelines-avoid-do-while %t
+
+void func1() {
+ int I{0};
+ const int Limit{10};
+
+ // CHECK-MESSAGES: :[[@LINE+1]]:3: warning: Try to avoid using do-while loops in terms of readability. Consider using a while loop instead. [cppcoreguidelines-avoid-do-while]
+ do {
+ I++;
+ } while (I <= Limit);
+}
+
+void func2() {
+ int I{0};
+ const int Limit{10};
+
+ // OK
+ while (I <= Limit) {
+ I++;
+ }
+}
+
+void func3() {
+#define MACRO \
+ do { \
+ } while (true)
+
+ // CHECK-MESSAGES: :[[@LINE+1]]:3: warning: Try to avoid using do-while loops in terms of readability. Consider using a while loop instead. [cppcoreguidelines-avoid-do-while]
+ MACRO;
+
+#undef MACRO
+}
+
+void func4() {
+#define MACRO \
+ do { \
+ } while (1)
+
+ // CHECK-MESSAGES: :[[@LINE+1]]:3: warning: Try to avoid using do-while loops in terms of readability. Consider using a while loop instead. [cppcoreguidelines-avoid-do-while]
+ MACRO;
+
+#undef MACRO
+}
+
+void func5() {
+#define MACRO \
+ do { \
+ } while (false)
+
+ // OK
+ MACRO;
+
+#undef MACRO
+}
+
+void func6() {
+#define MACRO \
+ do { \
+ } while (0)
+
+ // OK
+ MACRO;
+
+#undef MACRO
+}
+
+void func7() {
+#define MACRO \
+ do { \
+ } while (nullptr)
+
+ // OK
+ MACRO;
+
+#undef MACRO
+}
+
+void func8() {
+#define MACRO \
+ do { \
+ } while (__null)
+
+ // OK
+ MACRO;
+
+#undef MACRO
+}
Index: clang-tools-extra/docs/clang-tidy/checks/list.rst
===================================================================
--- clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -144,6 +144,7 @@
`clang-analyzer-valist.Unterminated <clang-analyzer-valist.Unterminated.html>`_,
`concurrency-mt-unsafe <concurrency-mt-unsafe.html>`_,
`concurrency-thread-canceltype-asynchronous <concurrency-thread-canceltype-asynchronous.html>`_,
+ `cppcoreguidelines-avoid-do-while <cppcoreguidelines-avoid-do-while.html>`_,
`cppcoreguidelines-avoid-goto <cppcoreguidelines-avoid-goto.html>`_,
`cppcoreguidelines-avoid-non-const-global-variables <cppcoreguidelines-avoid-non-const-global-variables.html>`_,
`cppcoreguidelines-init-variables <cppcoreguidelines-init-variables.html>`_, "Yes"
Index: clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-avoid-do-while.rst
===================================================================
--- /dev/null
+++ clang-tools-extra/docs/clang-tidy/checks/cppcoreguidelines-avoid-do-while.rst
@@ -0,0 +1,36 @@
+.. title:: clang-tidy - cppcoreguidelines-avoid-do-while
+
+cppcoreguidelines-avoid-do-while
+================================
+
+Checks if a ``do-while`` loop exists and flags it.
+
+Using a ``while`` loop instead of a ``do-while`` could improve readability and
+prevents overlooking the condition at the end.
+
+Usages of ``do-while`` loops inside a macro definition are not flagged by this
+check if the condition is either ``false``, ``0``, ``nullptr`` or ``__null``.
+
+.. code-block:: c++
+
+ void func1() {
+ int I{0};
+ const int Limit{10};
+
+ // Consider using a while loop
+ do {
+ I++;
+ } while (I <= Limit);
+ }
+
+ void func2() {
+ int I{0};
+ const int Limit{10};
+
+ // Better
+ while (I <= Limit) {
+ I++;
+ }
+ }
+
+This check implements rule `ES.75 <https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#es75-avoid-do-statements>`_ of the C++ Core Guidelines.
Index: clang-tools-extra/docs/ReleaseNotes.rst
===================================================================
--- clang-tools-extra/docs/ReleaseNotes.rst
+++ clang-tools-extra/docs/ReleaseNotes.rst
@@ -108,6 +108,11 @@
Finds inner loops that have not been unrolled, as well as fully unrolled
loops with unknown loops bounds or a large number of iterations.
+- New :doc:`cppcoreguidelines-avoid-do-while
+ <clang-tidy/checks/cppcoreguidelines-avoid-do-while>` check.
+
+ Checks if a ``do-while`` loop exists and flags it.
+
- New :doc:`cppcoreguidelines-prefer-member-initializer
<clang-tidy/checks/cppcoreguidelines-prefer-member-initializer>` check.
Index: clang-tools-extra/clang-tidy/cppcoreguidelines/CppCoreGuidelinesTidyModule.cpp
===================================================================
--- clang-tools-extra/clang-tidy/cppcoreguidelines/CppCoreGuidelinesTidyModule.cpp
+++ clang-tools-extra/clang-tidy/cppcoreguidelines/CppCoreGuidelinesTidyModule.cpp
@@ -14,6 +14,7 @@
#include "../modernize/AvoidCArraysCheck.h"
#include "../modernize/UseOverrideCheck.h"
#include "../readability/MagicNumbersCheck.h"
+#include "AvoidDoWhileCheck.h"
#include "AvoidGotoCheck.h"
#include "AvoidNonConstGlobalVariablesCheck.h"
#include "InitVariablesCheck.h"
@@ -46,6 +47,8 @@
void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
CheckFactories.registerCheck<modernize::AvoidCArraysCheck>(
"cppcoreguidelines-avoid-c-arrays");
+ CheckFactories.registerCheck<AvoidDoWhileCheck>(
+ "cppcoreguidelines-avoid-do-while");
CheckFactories.registerCheck<AvoidGotoCheck>(
"cppcoreguidelines-avoid-goto");
CheckFactories.registerCheck<readability::MagicNumbersCheck>(
Index: clang-tools-extra/clang-tidy/cppcoreguidelines/CMakeLists.txt
===================================================================
--- clang-tools-extra/clang-tidy/cppcoreguidelines/CMakeLists.txt
+++ clang-tools-extra/clang-tidy/cppcoreguidelines/CMakeLists.txt
@@ -4,6 +4,7 @@
)
add_clang_library(clangTidyCppCoreGuidelinesModule
+ AvoidDoWhileCheck.cpp
AvoidGotoCheck.cpp
AvoidNonConstGlobalVariablesCheck.cpp
CppCoreGuidelinesTidyModule.cpp
Index: clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidDoWhileCheck.h
===================================================================
--- /dev/null
+++ clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidDoWhileCheck.h
@@ -0,0 +1,37 @@
+//===--- AvoidDoWhileCheck.h - clang-tidy -----------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_AVOIDDOWHILECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_AVOIDDOWHILECHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang {
+namespace tidy {
+namespace cppcoreguidelines {
+
+/// Checks if a do-while loop exists and flags it.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/cppcoreguidelines-avoid-do-while.html
+class AvoidDoWhileCheck : public ClangTidyCheck {
+public:
+ AvoidDoWhileCheck(StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context) {}
+ bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
+ return LangOpts.CPlusPlus;
+ }
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace cppcoreguidelines
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CPPCOREGUIDELINES_AVOIDDOWHILECHECK_H
Index: clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidDoWhileCheck.cpp
===================================================================
--- /dev/null
+++ clang-tools-extra/clang-tidy/cppcoreguidelines/AvoidDoWhileCheck.cpp
@@ -0,0 +1,42 @@
+//===--- AvoidDoWhileCheck.cpp - clang-tidy -------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "AvoidDoWhileCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace cppcoreguidelines {
+
+AST_MATCHER(DoStmt, isInMacro) { return Node.getBeginLoc().isMacroID(); }
+
+void AvoidDoWhileCheck::registerMatchers(MatchFinder *Finder) {
+ Finder->addMatcher(
+ doStmt(unless(allOf(
+ isInMacro(),
+ hasCondition(ignoringImpCasts(anyOf(
+ cxxBoolLiteral(equals(false)), integerLiteral(equals(0)),
+ cxxNullPtrLiteralExpr(), gnuNullExpr()))))))
+ .bind("doStmt"),
+ this);
+}
+
+void AvoidDoWhileCheck::check(const MatchFinder::MatchResult &Result) {
+ const auto *MatchedDoStmt = Result.Nodes.getNodeAs<DoStmt>("doStmt");
+
+ diag(MatchedDoStmt->getDoLoc(),
+ "Try to avoid using do-while loops in terms of readability. Consider "
+ "using a while loop instead.");
+}
+
+} // namespace cppcoreguidelines
+} // namespace tidy
+} // namespace clang
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