bkramer updated this revision to Diff 66716.
bkramer added a comment.
Add relnote.
https://reviews.llvm.org/D23130
Files:
clang-tidy/misc/CMakeLists.txt
clang-tidy/misc/GlobalNamespaceCheck.cpp
clang-tidy/misc/GlobalNamespaceCheck.h
clang-tidy/misc/MiscTidyModule.cpp
docs/ReleaseNotes.rst
docs/clang-tidy/checks/list.rst
docs/clang-tidy/checks/misc-global-namespace.rst
test/clang-tidy/misc-global-namespace.cpp
Index: test/clang-tidy/misc-global-namespace.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/misc-global-namespace.cpp
@@ -0,0 +1,35 @@
+// RUN: %check_clang_tidy %s misc-global-namespace %t
+
+void f() {}
+// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: definition for 'f' in the global namespace
+class F {};
+// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: definition for 'F' in the global namespace
+int i;
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: definition for 'i' in the global namespace
+
+// No warnings below.
+void g();
+
+extern "C" void h() {}
+
+extern "C" {
+void j() {}
+}
+
+struct Clike {
+ int i;
+};
+
+void *operator new(__SIZE_TYPE__, int) { return 0; }
+void operator delete(void *, int) {}
+
+__attribute__((visibility("hidden"))) void k() {}
+static void l() {}
+namespace {
+void m() {}
+}
+namespace x {
+void n() {}
+}
+
+int main() {}
Index: docs/clang-tidy/checks/misc-global-namespace.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/misc-global-namespace.rst
@@ -0,0 +1,7 @@
+.. title:: clang-tidy - misc-global-namespace
+
+misc-global-namespace
+=====================
+
+Finds definitions in the global namespace. Those definitions are prone to ODR
+conflicts.
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -59,6 +59,7 @@
misc-definitions-in-headers
misc-fold-init-type
misc-forward-declaration-namespace
+ misc-global-namespace
misc-inaccurate-erase
misc-incorrect-roundings
misc-inefficient-algorithm
Index: docs/ReleaseNotes.rst
===================================================================
--- docs/ReleaseNotes.rst
+++ docs/ReleaseNotes.rst
@@ -69,6 +69,11 @@
Flags classes where some, but not all, special member functions are user-defined.
+- New `misc-global-namespace
+ <http://clang.llvm.org/extra/clang-tidy/checks/misc-global-namespace.html>`_ check
+
+ Flags definitions in the global namespace.
+
Improvements to include-fixer
-----------------------------
Index: clang-tidy/misc/MiscTidyModule.cpp
===================================================================
--- clang-tidy/misc/MiscTidyModule.cpp
+++ clang-tidy/misc/MiscTidyModule.cpp
@@ -12,18 +12,18 @@
#include "../ClangTidyModuleRegistry.h"
#include "ArgumentCommentCheck.h"
#include "AssertSideEffectCheck.h"
-#include "MisplacedConstCheck.h"
-#include "UnconventionalAssignOperatorCheck.h"
#include "BoolPointerImplicitConversionCheck.h"
#include "DanglingHandleCheck.h"
#include "DefinitionsInHeadersCheck.h"
#include "FoldInitTypeCheck.h"
#include "ForwardDeclarationNamespaceCheck.h"
+#include "GlobalNamespaceCheck.h"
#include "InaccurateEraseCheck.h"
#include "IncorrectRoundings.h"
#include "InefficientAlgorithmCheck.h"
#include "MacroParenthesesCheck.h"
#include "MacroRepeatedSideEffectsCheck.h"
+#include "MisplacedConstCheck.h"
#include "MisplacedWideningCastCheck.h"
#include "MoveConstantArgumentCheck.h"
#include "MoveConstructorInitCheck.h"
@@ -44,6 +44,7 @@
#include "SuspiciousStringCompareCheck.h"
#include "SwappedArgumentsCheck.h"
#include "ThrowByValueCatchByReferenceCheck.h"
+#include "UnconventionalAssignOperatorCheck.h"
#include "UndelegatedConstructor.h"
#include "UniqueptrResetReleaseCheck.h"
#include "UnusedAliasDeclsCheck.h"
@@ -62,6 +63,7 @@
CheckFactories.registerCheck<ArgumentCommentCheck>("misc-argument-comment");
CheckFactories.registerCheck<AssertSideEffectCheck>(
"misc-assert-side-effect");
+ CheckFactories.registerCheck<GlobalNamespaceCheck>("misc-global-namespace");
CheckFactories.registerCheck<MisplacedConstCheck>(
"misc-misplaced-const");
CheckFactories.registerCheck<UnconventionalAssignOperatorCheck>(
Index: clang-tidy/misc/GlobalNamespaceCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/misc/GlobalNamespaceCheck.h
@@ -0,0 +1,36 @@
+//===--- GlobalNamespaceCheck.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_MISC_GLOBAL_NAMESPACE_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_GLOBAL_NAMESPACE_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace misc {
+
+/// Finds definitions in the global namespace. Those definitions are prone to
+/// ODR conflicts.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/misc-global-namespace.html
+class GlobalNamespaceCheck : public ClangTidyCheck {
+public:
+ GlobalNamespaceCheck(StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context) {}
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace misc
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_GLOBAL_NAMESPACE_H
Index: clang-tidy/misc/GlobalNamespaceCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/misc/GlobalNamespaceCheck.cpp
@@ -0,0 +1,78 @@
+//===--- GlobalNamespaceCheck.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 "GlobalNamespaceCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace misc {
+
+void GlobalNamespaceCheck::registerMatchers(MatchFinder *Finder) {
+ if (!getLangOpts().CPlusPlus)
+ return;
+
+ Finder->addMatcher(
+ namedDecl(hasDeclContext(translationUnitDecl()),
+ anyOf(functionDecl(isDefinition(), unless(isDeleted()),
+ unless(isExternC())),
+ varDecl(isDefinition()), cxxRecordDecl(isDefinition())))
+ .bind("decl"),
+ this);
+}
+
+void GlobalNamespaceCheck::check(const MatchFinder::MatchResult &Result) {
+ const auto *MatchedDecl = Result.Nodes.getNodeAs<NamedDecl>("decl");
+
+ // Ignore decls with internal linkage. Hidden visibility can still lead to ODR
+ // violations but cannot cross DSO boundaries, so it's often used to separate
+ // namespaces, ignore those too.
+ LinkageInfo LV = MatchedDecl->getLinkageAndVisibility();
+ if (!isExternallyVisible(LV.getLinkage()) ||
+ LV.getVisibility() == HiddenVisibility)
+ return;
+
+ if (const auto *VDecl = dyn_cast<VarDecl>(MatchedDecl)) {
+ // extern "C" globals need to be in the global namespace.
+ if (VDecl->isExternC())
+ return;
+ }
+
+ if (const auto *RDecl = dyn_cast<CXXRecordDecl>(MatchedDecl)) {
+ // Ignore C-like records. Those are often used in C wrappers and don't
+ // contain anything with linkage.
+ if (RDecl->isCLike())
+ return;
+ }
+
+ if (const auto *FDecl = dyn_cast<FunctionDecl>(MatchedDecl)) {
+ // main() should be in the global namespace.
+ if (FDecl->isMain())
+ return;
+
+ // Ignore overloaded operators.
+ // FIXME: Should this only ignore global operator new/delete?
+ if (FDecl->isOverloadedOperator())
+ return;
+ }
+
+ // FIXME: If we want to be really fancy we could move declaration-less
+ // definitions into a global namespace or make them static with a FixIt.
+ diag(MatchedDecl->getLocation(), "definition for %0 in the global namespace; "
+ "move it into a namespace or give it "
+ "internal linkage to avoid ODR conflicts")
+ << MatchedDecl;
+}
+
+} // namespace misc
+} // namespace tidy
+} // namespace clang
Index: clang-tidy/misc/CMakeLists.txt
===================================================================
--- clang-tidy/misc/CMakeLists.txt
+++ clang-tidy/misc/CMakeLists.txt
@@ -3,6 +3,7 @@
add_clang_library(clangTidyMiscModule
ArgumentCommentCheck.cpp
AssertSideEffectCheck.cpp
+ GlobalNamespaceCheck.cpp
MisplacedConstCheck.cpp
UnconventionalAssignOperatorCheck.cpp
BoolPointerImplicitConversionCheck.cpp
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