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 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 +1,294 @@ +//===--- 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 "../utils/LexerUtils.h" +#include "clang/AST/ASTContext.h" +#include "clang/ASTMatchers/ASTMatchFinder.h" +#include "clang/Lex/Lexer.h" +#include "llvm/Support/Error.h" + +#include +#include + +using namespace clang::ast_matchers; +using namespace clang::tidy::utils::lexer; + +#define PRINT_DEBUG 1 + +namespace clang { +namespace tidy { +namespace readability { + +namespace { +AST_MATCHER(DeclStmt, isSingleDecl) { return Node.isSingleDecl(); } +AST_MATCHER(DeclStmt, isVariablesOnly) { + return std::all_of(Node.decl_begin(), Node.decl_end(), + [](Decl *D) { return isa(D); }); +} + +AST_MATCHER_P(IfStmt, hasInit, ast_matchers::internal::Matcher, + InnerMatcher) { + const Stmt *const InitStmt = Node.getInit(); + if (InitStmt) + return InnerMatcher.matches(*InitStmt, Finder, Builder); + return false; +} +} // namespace + +void IsolateDeclCheck::registerMatchers(MatchFinder *Finder) { + Finder->addMatcher( + stmt(allOf( + declStmt(allOf(isVariablesOnly(), unless(isSingleDecl()), + hasParent(compoundStmt()))) + .bind("decl_stmt"), + unless( + hasAncestor(forStmt(hasLoopInit(equalsBoundNode("decl_stmt"))))), + unless(hasAncestor(ifStmt(hasInit(equalsBoundNode("decl_stmt"))))))), + this); +} + +static SourceLocation findStartOfIndirection(SourceLocation Start, + int Indirections, + const SourceManager &SM, + const LangOptions &LangOpts) { + assert(Indirections >= 0 && "Indirections must be non-negative"); + if (Indirections == 0) + return Start; + + for (int i = Indirections; i > 0; --i) { + Start = findPreviousAnyTokenKind(Start, SM, LangOpts, tok::star, tok::amp); + if (Start.isInvalid() || Start.isMacroID()) + return SourceLocation(); + } + return Start; +} + +static bool isMacroID(SourceRange R) { + return R.getBegin().isMacroID() || R.getEnd().isMacroID(); +} + +static int countIndirections(const Type *T, int Indirections = 0) { + assert(T && "Require non-null"); + if (T->isPointerType() || T->isReferenceType()) + return countIndirections(T->getPointeeType().getTypePtr(), ++Indirections); + + if (T->isArrayType()) { + const auto *AT = dyn_cast(T->getCanonicalTypeInternal()); + // Note: Do not increment the 'Indirections' because it is not yet clear + // if there is an indirection added in the source code of the array + // declaration. + return countIndirections(AT->getElementType().getTypePtr(), Indirections); + } + return Indirections; +} + +static bool IsMemberPointer(const VarDecl *D) { + if (D->getType()->isMemberPointerType() || + D->getType()->isMemberDataPointerType() || + D->getType()->isMemberFunctionPointerType()) + return true; + return false; +} + +/// This function assumes, that \p DS only contains VarDecl elements. +static Optional> +DeclSlice(const DeclStmt *DS, const SourceManager &SM, + const LangOptions &LangOpts) { + std::size_t DeclCount = std::distance(DS->decl_begin(), DS->decl_end()); + if (DeclCount < 2) + return None; + + // The initial type of the declaration and each declaration has it's own + // slice. This is necessary, because pointers and references bind only + // to the local variable and not to all variables in the declaration. + // Example: 'int *pointer, value = 42;' + std::vector Slices; + Slices.reserve(DeclCount + 1); + + // Calculate the first slice, for now only variables are handled but in the + // future this should be relaxed and support various kinds of declarations. + VarDecl *FirstDecl = dyn_cast(*DS->decl_begin()); + assert(FirstDecl && "Expect only VarDecls"); + + // FIXME Memberpointer are not transformed correctly right now, thats + // why they are treated as problematic here. + if (IsMemberPointer(FirstDecl)) + return None; + + // Consider the following case: 'int * pointer, value = 42;' + // Created slices (inclusive) [ ][ ] [ ] + // Because 'getBeginLoc' points to the start of the variable *name*, the + // location of the pointer must be determined separatly. + SourceLocation Start = findStartOfIndirection( + FirstDecl->getLocation(), + countIndirections(FirstDecl->getType().getTypePtr()), SM, LangOpts); + + // Fix function-pointer declarations that have a '(' in front of the + // pointer. + // Example: 'void (*f2)(int), (*g2)(int, float) = gg;' + // Slices: [ ][ ] [ ] + if (FirstDecl->getType()->isFunctionPointerType()) + Start = findPreviousTokenKind(Start, SM, LangOpts, tok::l_paren); + +#if PRINT_DEBUG + std::cerr << "Start of Indirection: " << Start.printToString(SM) << "\n"; +#endif + + SourceRange DeclRange(DS->getBeginLoc(), Start); + // TODO Merge these conditions, elide braces + if (DeclRange.isInvalid()) { +#if PRINT_DEBUG + std::cerr << "DeclRange is invalid\n"; +#endif + return None; + } + if (isMacroID(DeclRange)) { +#if PRINT_DEBUG + std::cerr << "DeclRange is in macro\n"; +#endif + return None; + } + // The first slice, that is prepended to every isolated declaration, is + // created. + Slices.emplace_back(DeclRange); + + // Create all following slices that each declare a variable. + SourceLocation DeclBegin = Start; + for (auto It = DS->decl_begin(), End = DS->decl_end(); It != End; ++It) { + VarDecl *CurrentDecl = dyn_cast(*It); + assert(CurrentDecl && "Expect only VarDecls here"); + + // FIXME Memberpointer are not transformed correctly right now, thats + // why they are treated as problematic here. + if (IsMemberPointer(CurrentDecl)) + return None; + + SourceLocation DeclEnd; + if (CurrentDecl->hasInit()) + DeclEnd = + findNextTerminator(CurrentDecl->getInit()->getEndLoc(), SM, LangOpts); + else + DeclEnd = findNextTerminator(CurrentDecl->getEndLoc(), SM, LangOpts); + +#if PRINT_DEBUG + std::cerr << "Start of Slice: " << DeclBegin.printToString(SM) << "\n"; + std::cerr << "End of Slice: " << DeclEnd.printToString(SM) << "\n"; +#endif + + SourceRange VarNameRange(DeclBegin, DeclEnd); + // TODO Merge these conditions, elide braces + if (VarNameRange.isInvalid()) { +#if PRINT_DEBUG + std::cerr << "VarNameRange is invalid\n"; +#endif + return None; + } + if (isMacroID(VarNameRange)) { +#if PRINT_DEBUG + std::cerr << "VarNameRange is in macro\n"; +#endif + return None; + } + + Slices.emplace_back(VarNameRange); + DeclBegin = DeclEnd.getLocWithOffset(1); + } + + return Slices; +} + +static Optional> +SourceFromRanges(const std::vector &Ranges, + const SourceManager &SM, const LangOptions &LangOpts) { + std::vector Snippets; + Snippets.reserve(Ranges.size()); + + for (const auto &Range : Ranges) { + CharSourceRange CR = Lexer::getAsCharRange( + CharSourceRange::getCharRange(Range.getBegin(), Range.getEnd()), SM, + LangOpts); + + if (CR.isInvalid()) { +#if PRINT_DEBUG + std::cerr << "CharSourceRange is invalid\n"; +#endif + return None; + } + + bool InvalidText = false; + StringRef Snippet = Lexer::getSourceText(CR, SM, LangOpts, &InvalidText); + + // TODO elide braces + if (InvalidText) { +#if PRINT_DEBUG + std::cerr << "SourceText in invalid\n"; +#endif + return None; + } + + Snippets.emplace_back(Snippet); + } + + return Snippets; +} + +/// Excepts a vector {TypeSnippet, Firstdecl, SecondDecl, ...}. +static std::vector +CreateIsolatedDecls(const std::vector &Snippets) { + // The first section is the type snippet, which does not make a decl itself. + assert(Snippets.size() >= 2 && "No enough snippets to create isolated decls"); + std::vector Decls(Snippets.size() - 1); + + for (std::size_t i = 1, End = Snippets.size(); i < End; ++i) + Decls[i - 1] = Twine(Snippets[0]).concat(Snippets[i].ltrim()).str(); + + return Decls; +} + +static std::string Concat(const std::vector &Decls, + StringRef Indent) { + return llvm::join(Decls, Twine(";\n").concat(Indent).str()); +} + +void IsolateDeclCheck::check(const MatchFinder::MatchResult &Result) { + const auto *WholeDecl = Result.Nodes.getNodeAs("decl_stmt"); + + auto Diag = + diag(WholeDecl->getBeginLoc(), "this statement declares %0 variables") + << static_cast( + std::distance(WholeDecl->decl_begin(), WholeDecl->decl_end())); + + Optional> PotentialSlices = + DeclSlice(WholeDecl, *Result.SourceManager, getLangOpts()); + if (!PotentialSlices) + return; + + const std::vector &Slices = *PotentialSlices; + Optional> PotentialSnippets = + SourceFromRanges(Slices, *Result.SourceManager, getLangOpts()); + + if (!PotentialSnippets) + return; + + const std::vector& Snippets = *PotentialSnippets; + std::vector NewDecls = CreateIsolatedDecls(Snippets); + std::string Replacement = + Concat(NewDecls, Lexer::getIndentationForLine(WholeDecl->getBeginLoc(), + *Result.SourceManager)); +#if PRINT_DEBUG + std::cerr << Replacement << "\n"; +#endif + + Diag << FixItHint::CreateReplacement(WholeDecl->getSourceRange(), + Replacement); +} +} // namespace readability +} // namespace tidy +} // namespace clang 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( "readability-inconsistent-declaration-parameter-name"); + CheckFactories.registerCheck( + "readability-isolate-decl"); CheckFactories.registerCheck( "readability-magic-numbers"); CheckFactories.registerCheck( Index: clang-tidy/utils/LexerUtils.h =================================================================== --- clang-tidy/utils/LexerUtils.h +++ clang-tidy/utils/LexerUtils.h @@ -22,6 +22,61 @@ Token getPreviousToken(const ASTContext &Context, SourceLocation Location, bool SkipComments = true); +SourceLocation findPreviousTokenStart(SourceLocation Start, + const SourceManager &SM, + const LangOptions &LangOpts); + +SourceLocation findPreviousTokenKind(SourceLocation Start, + const SourceManager &SM, + const LangOptions &LangOpts, + tok::TokenKind TK); + +SourceLocation findNextTerminator(SourceLocation Start, const SourceManager &SM, + const LangOptions &LangOpts); + +template +SourceLocation findPreviousAnyTokenKind(SourceLocation Start, + const SourceManager &SM, + const LangOptions &LangOpts, + TokenKind TK, TokenKinds... TKs) { + while (true) { + SourceLocation L = findPreviousTokenStart(Start, SM, LangOpts); + if (L.isInvalid() || L.isMacroID()) + return SourceLocation(); + + Token T; + bool FailedRetrievingToken = Lexer::getRawToken(L, T, SM, LangOpts); + + if (FailedRetrievingToken) + return SourceLocation(); + + if (T.isOneOf(TK, TKs...)) + return T.getLocation(); + + Start = L; + } +} + +template +SourceLocation findNextAnyTokenKind(SourceLocation Start, + const SourceManager &SM, + const LangOptions &LangOpts, TokenKind TK, + TokenKinds... TKs) { + while (true) { + Optional CurrentToken = Lexer::findNextToken(Start, SM, LangOpts); + + if (!CurrentToken) + return SourceLocation(); + + Token PotentialMatch = *CurrentToken; + if (PotentialMatch.isOneOf(TK, TKs...)) + return PotentialMatch.getLocation(); + + Start = + Lexer::getLocForEndOfToken(Start, 0, SM, LangOpts).getLocWithOffset(1); + } +} + } // namespace lexer } // namespace utils } // namespace tidy Index: clang-tidy/utils/LexerUtils.cpp =================================================================== --- clang-tidy/utils/LexerUtils.cpp +++ clang-tidy/utils/LexerUtils.cpp @@ -35,6 +35,45 @@ return Token; } +SourceLocation findPreviousTokenStart(SourceLocation Start, + const SourceManager &SM, + const LangOptions &LangOpts) { + if (Start.isInvalid() || Start.isMacroID()) + return SourceLocation(); + + SourceLocation BeforeStart = Start.getLocWithOffset(-1); + if (BeforeStart.isInvalid() || BeforeStart.isMacroID()) + return SourceLocation(); + + return Lexer::GetBeginningOfToken(BeforeStart, SM, LangOpts); +} + +SourceLocation findPreviousTokenKind(SourceLocation Start, + const SourceManager &SM, + const LangOptions &LangOpts, + tok::TokenKind TK) { + while (true) { + SourceLocation L = findPreviousTokenStart(Start, SM, LangOpts); + if (L.isInvalid() || L.isMacroID()) + return SourceLocation(); + + Token T; + bool FailedRetrievingToken = Lexer::getRawToken(L, T, SM, LangOpts); + + if (FailedRetrievingToken) + return SourceLocation(); + + if (T.is(TK)) + return T.getLocation(); + + Start = L; + } +} + +SourceLocation findNextTerminator(SourceLocation Start, const SourceManager &SM, + const LangOptions &LangOpts) { + return findNextAnyTokenKind(Start, SM, LangOpts, tok::comma, tok::semi); +} } // namespace lexer } // namespace utils } // namespace tidy Index: docs/ReleaseNotes.rst =================================================================== --- docs/ReleaseNotes.rst +++ docs/ReleaseNotes.rst @@ -100,6 +100,11 @@ ``namespace a { namespace b { ... }}`` and offers change to syntax introduced in C++17 standard: ``namespace a::b { ... }``. +- New :doc:`readability-isolate-decl + ` check. + + FIXME: add release notes. + - New :doc:`readability-magic-numbers ` check. Index: docs/clang-tidy/checks/list.rst =================================================================== --- docs/clang-tidy/checks/list.rst +++ docs/clang-tidy/checks/list.rst @@ -226,6 +226,7 @@ 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/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: test/clang-tidy/readability-isolate-decl-cxx17.cpp =================================================================== --- /dev/null +++ test/clang-tidy/readability-isolate-decl-cxx17.cpp @@ -0,0 +1,105 @@ +// RUN: %check_clang_tidy %s readability-isolate-decl %t -- -- -std=c++17 + +template +struct pair { + T1 first; + T2 second; + pair(T1 v1, T2 v2) : first(v1), second(v2) {} + + template + decltype(auto) get() const { + if constexpr (N == 0) + return first; + else if constexpr (N == 1) + return second; + } +}; + +void forbidden_transformations() { + if (int i = 42, j = i; i == j) + ; + + auto [i, j] = pair(42, 42); +} + +struct SomeClass { + SomeClass() = default; + SomeClass(int value); +}; + +namespace std { +template +class initializer_list {}; + +template +class vector { +public: + vector() = default; + vector(initializer_list init) {} +}; + +class string { +public: + string() = default; + string(const char *) {} +}; + +namespace string_literals { +string operator""s(const char *, decltype(sizeof(int))) { + return string(); +} +} // namespace string_literals +} // namespace std + +namespace Types { +typedef int MyType; +} // namespace Types + +int touch1, touch2; +// TODO This is not a 'declStmt', why? +// CHECK MESSAGES: [[@LINE-1]]:1: warning: this statement declares 2 variables +// CHECK FIXES: {{^}}int touch1; +// CHECK FIXES: {{^}}int touch2; + +void modern() { + auto autoInt1 = 3, autoInt2 = 4; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: auto autoInt1 = 3; + // CHECK-FIXES: {{^ }}auto autoInt2 = 4; + + decltype(int()) declnottouch = 4; + decltype(int()) declint1 = 5, declint2 = 3; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: decltype(int()) declint1 = 5; + // CHECK-FIXES: {{^ }}decltype(int()) declint2 = 3; + + std::vector vectorA = {1, 2}, vectorB = {1, 2, 3}, vectorC({1, 1, 1}); + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 3 variables + // CHECK-FIXES: std::vector vectorA = {1, 2}; + // CHECK-FIXES: {{^ }}std::vector vectorB = {1, 2, 3}; + // CHECK-FIXES: {{^ }}std::vector vectorC({1, 1, 1}); + + using uType = int; + uType utype1, utype2; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: uType utype1; + // CHECK-FIXES: {{^ }}uType utype2; + + Types::MyType mytype1, mytype2, mytype3 = 3; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 3 variables + // CHECK-FIXES: Types::MyType mytype1; + // CHECK-FIXES: {{^ }}Types::MyType mytype2; + // CHECK-FIXES: {{^ }}Types::MyType mytype3 = 3; + + { + using namespace std::string_literals; + + std::vector s{"foo"s, "bar"s}, t{"foo"s}, u, a({"hey", "you"}), bb = {"h", "a"}; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 5 variables + // CHECK-FIXES: std::vector s{"foo"s, "bar"s}; + // CHECK-FIXES: {{^ }}std::vector t{"foo"s}; + // CHECK-FIXES: {{^ }}std::vector u; + // CHECK-FIXES: {{^ }}std::vector a({"hey", "you"}); + // CHECK-FIXES: {{^ }}std::vector bb = {"h", "a"}; + } +} Index: test/clang-tidy/readability-isolate-decl.cpp =================================================================== --- /dev/null +++ test/clang-tidy/readability-isolate-decl.cpp @@ -0,0 +1,356 @@ +// 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: this statement declares 4 variables + // CHECK-FIXES: int i; + // CHECK-FIXES: {{^ }}int j; + // CHECK-FIXES: {{^ }}int *k; + // CHECK-FIXES: {{^ }}int lala = 42; + + int normal, weird = /* comment */ 42; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: int normal; + // CHECK-FIXES: {{^ }}int weird = /* comment */ 42; + // + int /* here is a comment */ v1, + // another comment + v2 = 42 // Ok, more comments + ; + // CHECK-MESSAGES: [[@LINE-4]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: int /* here is a comment */ v1; + // CHECK-FIXES: {{^ }}int /* here is a comment */ // another comment + // CHECK-FIXES: {{^ }}v2 = 42 // Ok, more comments + // CHECK-FIXES: {{^ }}; +} + +void f3() { + int i, *pointer1; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: int i; + // CHECK-FIXES: {{^ }}int *pointer1; + // + int *pointer2 = nullptr, *pointer3 = &i; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: int *pointer2 = nullptr; + // CHECK-FIXES: {{^ }}int *pointer3 = &i; +} + +void f4() { + double d = 42. /* foo */, z = 43., /* hi */ y, c /* */ /* */, l = 2.; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 5 variables + // CHECK-FIXES: double d = 42. /* foo */; + // CHECK-FIXES: {{^ }}double z = 43.; + // CHECK-FIXES: {{^ }}double /* hi */ y; + // CHECK-FIXES: {{^ }}double c /* */ /* */; + // CHECK-FIXES: {{^ }}double l = 2.; +} + +struct SomeClass { + SomeClass() = default; + SomeClass(int value); +}; +void f5() { + SomeClass v1, v2(42), v3{42}, v4(42.5); + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 4 variables + // CHECK-FIXES: SomeClass v1; + // CHECK-FIXES: {{^ }}SomeClass v2(42); + // CHECK-FIXES: {{^ }}SomeClass v3{42}; + // CHECK-FIXES: {{^ }}SomeClass v4(42.5); + + SomeClass v5 = 42, *p1 = nullptr; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: SomeClass v5 = 42; + // CHECK-FIXES: {{^ }}SomeClass *p1 = nullptr; +} + +void f6() { + int array1[] = {1, 2, 3, 4}, array2[] = {1, 2, 3}, value1, value2 = 42; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 4 variables + // CHECK-FIXES: int array1[] = {1, 2, 3, 4}; + // CHECK-FIXES: {{^ }}int array2[] = {1, 2, 3}; + // CHECK-FIXES: {{^ }}int value1; + // CHECK-FIXES: {{^ }}int value2 = 42; +} + +template +struct TemplatedType { + TemplatedType() = default; + TemplatedType(T value); +}; + +void f7() { + TemplatedType TT1(42), TT2{42}, TT3; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 3 variables + // CHECK-FIXES: TemplatedType TT1(42); + // CHECK-FIXES: {{^ }}TemplatedType TT2{42}; + // CHECK-FIXES: {{^ }}TemplatedType TT3; + // + TemplatedType *TT4(nullptr), TT5, **TT6 = nullptr, *const *const TT7{nullptr}; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 4 variables + // CHECK-FIXES: TemplatedType *TT4(nullptr); + // CHECK-FIXES: {{^ }}TemplatedType TT5; + // CHECK-FIXES: {{^ }}TemplatedType **TT6 = nullptr; + // CHECK-FIXES: {{^ }}TemplatedType *const *const TT7{nullptr}; + + TemplatedType **TT8(nullptr), *TT9; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: TemplatedType **T8(nullptr); + // CHECK-FIXES: {{^ }}TemplatedType *TT9; +} + +void forbidden_transformations() { + for (int i = 0, j = 42; i < j; ++i) + ; +} + +#define NULL 0 +#define MY_NICE_TYPE int ** +#define VAR_NAME(name) name##__LINE__ +#define A_BUNCH_OF_VARIABLES int m1 = 42, m2 = 43, m3 = 44; + +void macros() { + int *p1 = NULL, *p2 = NULL; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: int *p1 = NULL; + // CHECK-FIXES: {{^ }}int *p2 = NULL; + + // Macros are involved, so there will be no transformation + MY_NICE_TYPE p3, v1, v2; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 3 variables + + int VAR_NAME(v3), + VAR_NAME(v4), + VAR_NAME(v5); + // CHECK-MESSAGES: [[@LINE-3]]:3: warning: this statement declares 3 variables + + A_BUNCH_OF_VARIABLES + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 3 variables +} + +void dontTouchParameter(int param1, int param2) {} + +struct StructOne { + StructOne() {} + StructOne(int b) {} + + int member1, member2; + // TODO Transform FieldDecl's as well +}; + +using PointerType = int; + +struct { + int i; +} AS1, AS2; +struct TemT { + template + T *getAs() { + return nullptr; + } +} TT1, TT2; + +void complex() { + typedef int *IntPtr; + typedef int ArrayType[2]; + typedef int FunType(void); + + IntPtr intptr1, intptr2 = nullptr, intptr3; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 3 variables + // TODO SourceText is invalid, why and where? + // CHECK FIXES: IntPtr intptr1; + // CHECK FIXES: {{^ }}IntPtr intptr2 = nullptr; + // CHECK FIXES: {{^ }}IntPtr intptr3; + + ArrayType arraytype1, arraytype2 = {1}, arraytype3; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 3 variables + // CHECK-FIXES: ArrayType arraytype1; + // CHECK-FIXES: {{^ }}ArrayType arraytype2 = {1}; + // CHECK-FIXES: {{^ }}ArrayType arraytype3; + + // Don't touch function declarations. + FunType funtype1, funtype2, functype3; + + for (int index1 = 0, index2 = 0;;) { + int localFor1 = 1, localFor2 = 2; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // CHECK-FIXES: int localFor1 = 1; + // CHECK-FIXES: {{^ }}int localFor2 = 2; + } + + StructOne s1, s2(23), s3, s4(3), *sptr = new StructOne(2); + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 5 variables + // CHECK-FIXES: StructOne s1; + // CHECK-FIXES: {{^ }}StructOne s2(23); + // CHECK-FIXES: {{^ }}StructOne s3; + // CHECK-FIXES: {{^ }}StructOne s4(3); + // CHECK-FIXES: {{^ }}StructOne *sptr = new StructOne(2); + + struct StructOne cs1, cs2(42); + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: struct StructOne cs1; + // CHECK-FIXES: {{^ }}struct StructOne cs2(42); + + int *ptrArray[3], dummy, **ptrArray2[5], twoDim[2][3], *twoDimPtr[2][3]; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 5 variables + // CHECK-FIXES: int *ptrArray[3]; + // CHECK-FIXES: {{^ }}int dummy; + // CHECK-FIXES: {{^ }}int **ptrArray2[5]; + // CHECK-FIXES: {{^ }}int twoDim[2][3]; + // CHECK-FIXES: {{^ }}int *twoDimPtr[2][3]; + + { + void f1(int), g1(int, float); + } + + { + void gg(int, float); + + void (*f2)(int), (*g2)(int, float) = gg; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // CHECK-FIXES: void (*f2)(int); + // CHECK-FIXES: {{^ }}void (*g2)(int, float) = gg; + + void /*(*/ (/*(*/ *f3)(int), (*g3)(int, float); + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // TODO Why is this incorrect? + // CHECK FIXES: void /*(*/ (/*(*/ *f3)(int); + // CHECK FIXES: {{^ }}void /*(*/ (*g3)(int, float); + } + + struct S { + int a; + const int b; + void f() {} + }; + + // TODO Memberpointers are transformed incorrect. Emit only a warning + // for now. + int S::*p = &S::a, S::*const q = &S::a; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK FIXES: int S::*p = &S::a; + // CHECK FIXES: {{^ }}int S::*const q = &S::a; + + int /* :: */ S::*pp2 = &S::a, var1 = 0; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK FIXES: int /* :: */ S::*pp2 = &S::a; + // CHECK FIXES: {{^ }}int var1 = 0; + + const int S::*r = &S::b, S::*t; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK FIXES: const int S::*r = &S::b; + // CHECK FIXES: {{^ }}const int S::*t; + + { + int S::*mdpa1[2] = {&S::a, &S::a}, var1 = 0; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // CHECK FIXES: int S::*mdpa1[2] = {&S::a, &S::a}; + // CHECK FIXES: {{^ }}int var1 = 0; + + int S ::**mdpa2[2] = {&p, &pp2}, var2 = 0; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // CHECK FIXES: int S ::**mdpa2[2] = {&p, &pp2}; + // CHECK FIXES: {{^ }}int var2 = 0; + + void (S::*mdfp1)() = &S::f, (S::*mdfp2)() = &S::f; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // CHECK FIXES: void (S::*mdfp1)() = &S::f; + // CHECK FIXES: {{^ }}void (S::*mdfp2)() = &S::f; + + void (S::*mdfpa1[2])() = {&S::f, &S::f}, (S::*mdfpa2)() = &S::f; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // CHECK FIXES: void (S::*mdfpa1[2])() = {&S::f, &S::f}; + // CHECK FIXES: {{^ }}void (S::*mdfpa2)() = &S::f; + + void (S::* * mdfpa3[2])() = {&mdfpa1[0], &mdfpa1[1]}, (S::*mdfpa4)() = &S::f; + // CHECK-MESSAGES: [[@LINE-1]]:5: warning: this statement declares 2 variables + // CHECK FIXES: void (S::* * mdfpa3[2])() = {&mdfpa1[0], &mdfpa1[1]}; + // CHECK FIXES: {{^ }}void (S::*mdfpa4)() = &S::f; + } + + typedef const int S::*MemPtr; + MemPtr aaa = &S::a, bbb = &S::b; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK FIXES: MemPtr aaa = &S::a; + // CHECK FIXES: {{^ }}MemPtr bbb = &S::b; + + class CS { + public: + int a; + const int b; + }; + int const CS ::*pp = &CS::a, CS::*const qq = &CS::a; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK FIXES: int const CS ::*pp = &CS::a; + // CHECK FIXES: {{^ }}int const CS::*const qq = &CS::a; + + // clang-format off + auto returner = []() { return int(32); }; + int intfunction = returner(), intarray[] = + { + 1, + 2, + 3, + 4 + }, bb = 4; + // CHECK-MESSAGES: [[@LINE-7]]:3: warning: this statement declares 3 variables + // CHECK-FIXES: int intfunction = returner(); + // CHECK-FIXES: {{^ }}int intarray[] = + // CHECK-FIXES: {{^ }}{ + // CHECK-FIXES: {{^ }}1, + // CHECK-FIXES: {{^ }}2, + // CHECK-FIXES: {{^ }}3, + // CHECK-FIXES: {{^ }}4 + // CHECK-FIXES: {{^ }}}; + // CHECK-FIXES: {{^ }}int bb = 4; + // clang-format on + + TemT *T1 = &TT1, *T2 = &TT2; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: TemT *T1 = &TT1; + // CHECK-FIXES: {{^ }}TemT *T2 = &TT2; + + const PointerType *PT1 = T1->getAs(), + *PT2 = T2->getAs(); + // CHECK-MESSAGES: [[@LINE-2]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: const PointerType *PT1 = T1->getAs(); + // CHECK-FIXES: {{^ }}const PointerType *PT2 = T2->getAs(); + + const int *p1 = nullptr; + const int *p2 = nullptr; + + const int *&pref1 = p1, *&pref2 = p2; + // CHECK-MESSAGES: [[@LINE-1]]:3: warning: this statement declares 2 variables + // CHECK-FIXES: const int *&pref1 = p1; + // CHECK-FIXES: {{^ }}const int *&pref2 = p2; + + // clang-format off + const char *literal1 = "clang" "test"\ + "one", + *literal2 = "empty", literal3[] = "three"; + // CHECK-MESSAGES: [[@LINE-3]]:3: warning: this statement declares 3 variables + // CHECK-FIXES: const char *literal1 = "clang" "test"\ + // CHECK-FIXES: {{^ }}"one"; + // CHECK-FIXES: {{^ }}const char *literal2 = "empty"; + // CHECK-FIXES: {{^ }}const char literal3[] = "three"; + // clang-format on +} + +typedef int *tptr, tbt; +typedef int (&tfp)(int, long), tarr[10]; +typedef int tarr2[10], tct; + +template +void should_not_be_touched(A, B); + +int variable, function(void); + +int call_func_with_sideeffect(); +void bad_if_decl() { + if (true) + int i, j, k = call_func_with_sideeffect(); +}