JonasToth created this revision.
JonasToth added reviewers: rsmith, aaron.ballman, alexfh, hokein.
Herald added subscribers: cfe-commits, xazax.hun, mgorny.
The idea of this check is to enforce one decl per statement and to include
an automated code transformation for all multi-decl statments.
It turns out this is more complicated then I excepted, so this differential
is a playground for now to allow easy commenting and discussions on the code.
Repository:
rCTE Clang Tools Extra
https://reviews.llvm.org/D51949
Files:
clang-tidy/readability/CMakeLists.txt
clang-tidy/readability/IsolateDeclCheck.cpp
clang-tidy/readability/IsolateDeclCheck.h
clang-tidy/readability/ReadabilityTidyModule.cpp
docs/ReleaseNotes.rst
docs/clang-tidy/checks/list.rst
docs/clang-tidy/checks/readability-isolate-decl.rst
test/clang-tidy/readability-isolate-decl.cpp
Index: test/clang-tidy/readability-isolate-decl.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/readability-isolate-decl.cpp
@@ -0,0 +1,65 @@
+// RUN: %check_clang_tidy %s readability-isolate-decl %t
+
+void f() {
+ int i;
+}
+
+void f2() {
+ int i, j, *k, lala = 42;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: int i;int j;int * k;int lala = 42;
+ //
+ int normal, weird = /* comment */ 42;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: int normal;int weird = 42;
+}
+
+void f3() {
+ int i, *pointer1;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: int i;int * pointer1;
+ //
+ int *pointer2 = nullptr, *pointer3 = &i;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: int * pointer2 = nullpt;int * pointer3 = &i;
+}
+
+void f4() {
+ // clang-format off
+ double d = 42./* foo */, z = 43., /* hi */ y, c /* */ /* */, l = 2.;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: double d = 42;double z = 43;double y;double c;double l = 2.;
+ // clang-format on
+}
+
+struct SomeClass {
+ SomeClass() = default;
+ SomeClass(int value);
+};
+void f5() {
+ SomeClass v1, v2(42), v3{42}, v4(42.5);
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: SomeClass v1 = v1;SomeClass v2 = v2(42);SomeClass v3 = v3{42};SomeClass v4 = v4(42.5);
+
+ SomeClass v5 = 42, *p1 = nullptr;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: SomeClass v5 = v5 = 42;SomeClass * p1 = nullpt;
+}
+
+void f6() {
+ int array1[] = {1, 2, 3, 4}, array2[] = {1, 2, 3}, value1, value2 = 42;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: int [4] array1 = {1, 2, 3, 4};int [3] array2 = {1, 2, 3};int value1;int value2 = 42;
+}
+
+template <typename T>
+struct TemplatedType {
+ TemplatedType() = default;
+ TemplatedType(T value);
+};
+
+void f7() {
+ TemplatedType<int> TT1(42), TT2{42}, TT3;
+ // CHECK-MESSAGES: [[@LINE-1]]:3: warning: make only one declaration per statement
+ // CHECK-FIXES: TemplatedType<int> TT1 = TT1(42);TemplatedType<int> TT2 = TT2{42};TemplatedType<int> TT3 = TT;
+}
Index: docs/clang-tidy/checks/readability-isolate-decl.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/readability-isolate-decl.rst
@@ -0,0 +1,6 @@
+.. title:: clang-tidy - readability-isolate-decl
+
+readability-isolate-decl
+========================
+
+FIXME: Describe what patterns does the check detect and why. Give examples.
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -225,6 +225,7 @@
readability-identifier-naming
readability-implicit-bool-conversion
readability-inconsistent-declaration-parameter-name
+ readability-isolate-decl
readability-magic-numbers
readability-misleading-indentation
readability-misplaced-array-index
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -93,6 +93,11 @@
Flags uses of ``absl::StrCat()`` to append to a ``std::string``. Suggests
``absl::StrAppend()`` should be used instead.
+- New :doc:`readability-isolate-decl
+ <clang-tidy/checks/readability-isolate-decl>` check.
+
+ FIXME: add release notes.
+
- New :doc:`readability-magic-numbers
<clang-tidy/checks/readability-magic-numbers>` check.
Index: clang-tidy/readability/ReadabilityTidyModule.cpp
===================================================================
--- clang-tidy/readability/ReadabilityTidyModule.cpp
+++ clang-tidy/readability/ReadabilityTidyModule.cpp
@@ -20,6 +20,7 @@
#include "IdentifierNamingCheck.h"
#include "ImplicitBoolConversionCheck.h"
#include "InconsistentDeclarationParameterNameCheck.h"
+#include "IsolateDeclCheck.h"
#include "MagicNumbersCheck.h"
#include "MisleadingIndentationCheck.h"
#include "MisplacedArrayIndexCheck.h"
@@ -66,6 +67,8 @@
"readability-implicit-bool-conversion");
CheckFactories.registerCheck<InconsistentDeclarationParameterNameCheck>(
"readability-inconsistent-declaration-parameter-name");
+ CheckFactories.registerCheck<IsolateDeclCheck>(
+ "readability-isolate-decl");
CheckFactories.registerCheck<MagicNumbersCheck>(
"readability-magic-numbers");
CheckFactories.registerCheck<MisleadingIndentationCheck>(
Index: clang-tidy/readability/IsolateDeclCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/readability/IsolateDeclCheck.h
@@ -0,0 +1,35 @@
+//===--- IsolateDeclCheck.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_READABILITY_ISOLATEDECLCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_ISOLATEDECLCHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+/// FIXME: Write a short description.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/readability-isolate-decl.html
+class IsolateDeclCheck : public ClangTidyCheck {
+public:
+ IsolateDeclCheck(StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context) {}
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_ISOLATEDECLCHECK_H
Index: clang-tidy/readability/IsolateDeclCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/readability/IsolateDeclCheck.cpp
@@ -0,0 +1,79 @@
+//===--- IsolateDeclCheck.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 "IsolateDeclCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+namespace {
+AST_MATCHER(DeclStmt, isSingleDecl) { return Node.isSingleDecl(); }
+} // namespace
+
+void IsolateDeclCheck::registerMatchers(MatchFinder *Finder) {
+ Finder->addMatcher(declStmt(unless(isSingleDecl())).bind("decl_stmt"), this);
+}
+
+namespace {
+std::string GetIsolatedDecl(const VarDecl *D, const SourceManager &SM,
+ const LangOptions &LangOpts) {
+ QualType VarType = D->getType();
+ PrintingPolicy TypePrinter(LangOpts);
+
+ std::string TypeAndName =
+ VarType.getAsString(TypePrinter) + " " + D->getNameAsString();
+ std::string Initializer = "";
+
+ if (D->hasInit()) {
+ SourceRange InclusiveRange(D->getInit()->getBeginLoc(),
+ D->getInit()->getEndLoc().getLocWithOffset(2));
+ assert(InclusiveRange.isValid() && "Invalid Source Range created");
+
+ CharSourceRange R = Lexer::getAsCharRange(InclusiveRange, SM, LangOpts);
+ assert(R.isValid() && "Retrieved invalid char source range");
+
+ bool InvalidText = false;
+ Initializer = Lexer::getSourceText(R, SM, LangOpts, &InvalidText).str();
+ assert(!InvalidText && "Retrieved invalid text");
+
+ return TypeAndName + " = " + Initializer + ";";
+ }
+
+ return TypeAndName + ";";
+}
+} // namespace
+
+void IsolateDeclCheck::check(const MatchFinder::MatchResult &Result) {
+ const auto *WholeDecl = Result.Nodes.getNodeAs<DeclStmt>("decl_stmt");
+ std::string Replacement = "";
+
+ for (const Decl *D : WholeDecl->decls()) {
+ const auto *VD = dyn_cast<VarDecl>(D);
+ if (VD == nullptr) {
+ Replacement.clear();
+ break;
+ }
+ Replacement += GetIsolatedDecl(VD, *Result.SourceManager, getLangOpts());
+ }
+ auto Diag =
+ diag(WholeDecl->getBeginLoc(), "make only one declaration per statement");
+
+ if (!Replacement.empty())
+ Diag << FixItHint::CreateReplacement(WholeDecl->getSourceRange(),
+ Replacement);
+}
+} // namespace readability
+} // namespace tidy
+} // namespace clang
Index: clang-tidy/readability/CMakeLists.txt
===================================================================
--- clang-tidy/readability/CMakeLists.txt
+++ clang-tidy/readability/CMakeLists.txt
@@ -11,6 +11,7 @@
IdentifierNamingCheck.cpp
ImplicitBoolConversionCheck.cpp
InconsistentDeclarationParameterNameCheck.cpp
+ IsolateDeclCheck.cpp
MagicNumbersCheck.cpp
MisleadingIndentationCheck.cpp
MisplacedArrayIndexCheck.cpp
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