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[clang-tidy] Add abseil-no-internal-dependencies check
Finds instances where the user depends on internal details and warns them against doing so. Should not be run on internal Abseil files or Abseil source code. Patch by hugoeg! Differential Revision: https://reviews.llvm.org/D50542 llvm-svn: 340928
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48 changes: 48 additions & 0 deletions
48
clang-tools-extra/clang-tidy/abseil/NoInternalDependenciesCheck.cpp
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//===--- NoInternalDependenciesCheck.cpp - clang-tidy----------------------===// | ||
// | ||
// The LLVM Compiler Infrastructure | ||
// | ||
// This file is distributed under the University of Illinois Open Source | ||
// License. See LICENSE.TXT for details. | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#include "NoInternalDependenciesCheck.h" | ||
#include "AbseilMatcher.h" | ||
#include "clang/AST/ASTContext.h" | ||
#include "clang/ASTMatchers/ASTMatchFinder.h" | ||
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using namespace clang::ast_matchers; | ||
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namespace clang { | ||
namespace tidy { | ||
namespace abseil { | ||
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void NoInternalDependenciesCheck::registerMatchers(MatchFinder *Finder) { | ||
if (!getLangOpts().CPlusPlus) | ||
return; | ||
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// TODO: refactor matcher to be configurable or just match on any internal | ||
// access from outside the enclosing namespace. | ||
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Finder->addMatcher( | ||
nestedNameSpecifierLoc(loc(specifiesNamespace(namespaceDecl( | ||
matchesName("internal"), | ||
hasParent(namespaceDecl(hasName("absl")))))), | ||
unless(isInAbseilFile())) | ||
.bind("InternalDep"), | ||
this); | ||
} | ||
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void NoInternalDependenciesCheck::check(const MatchFinder::MatchResult &Result) { | ||
const auto *InternalDependency = | ||
Result.Nodes.getNodeAs<NestedNameSpecifierLoc>("InternalDep"); | ||
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diag(InternalDependency->getBeginLoc(), | ||
"do not reference any 'internal' namespaces; those implementation " | ||
"details are reserved to Abseil"); | ||
} | ||
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} // namespace abseil | ||
} // namespace tidy | ||
} // namespace clang |
36 changes: 36 additions & 0 deletions
36
clang-tools-extra/clang-tidy/abseil/NoInternalDependenciesCheck.h
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//===--- NoInternalDependenciesCheck.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. | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_NOINTERNALDEPSCHECK_H | ||
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_NOINTERNALDEPSCHECK_H | ||
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#include "../ClangTidy.h" | ||
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namespace clang { | ||
namespace tidy { | ||
namespace abseil { | ||
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/// Finds instances where the user depends on internal details and warns them | ||
/// against doing so. | ||
/// | ||
/// For the user-facing documentation see: | ||
/// http://clang.llvm.org/extra/clang-tidy/checks/abseil-no-internal-dependencies.html | ||
class NoInternalDependenciesCheck : public ClangTidyCheck { | ||
public: | ||
NoInternalDependenciesCheck(StringRef Name, ClangTidyContext *Context) | ||
: ClangTidyCheck(Name, Context) {} | ||
void registerMatchers(ast_matchers::MatchFinder *Finder) override; | ||
void check(const ast_matchers::MatchFinder::MatchResult &Result) override; | ||
}; | ||
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} // namespace abseil | ||
} // namespace tidy | ||
} // namespace clang | ||
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_NOINTERNALDEPSCHECK_H |
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24 changes: 24 additions & 0 deletions
24
clang-tools-extra/docs/clang-tidy/checks/abseil-no-internal-dependencies.rst
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subl.. title:: clang-tidy - abseil-no-internal-dependencies | ||
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abseil-no-internal-dependencies | ||
=============================== | ||
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Warns if code using Abseil depends on internal details. If something is in a | ||
namespace that includes the word “internal”, code is not allowed to depend upon | ||
it beaucse it’s an implementation detail. They cannot friend it, include it, | ||
you mention it or refer to it in any way. Doing so violates Abseil's | ||
compatibility guidelines and may result in breakage. See | ||
https://abseil.io/about/compatibility for more information. | ||
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The following cases will result in warnings: | ||
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.. code-block:: c++ | ||
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absl::strings_internal::foo(); | ||
// warning triggered on this line | ||
class foo { | ||
friend struct absl::container_internal::faa; | ||
// warning triggered on this line | ||
}; | ||
absl::memory_internal::MakeUniqueResult(); | ||
// warning triggered on this line |
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namespace absl {} | ||
namespace absl { | ||
namespace base_internal { | ||
void InternalFunction() {} | ||
} // namespace base_internal | ||
} //namespace absl | ||
void DirectAccess2() { absl::base_internal::InternalFunction(); } |
34 changes: 33 additions & 1 deletion
34
clang-tools-extra/test/clang-tidy/Inputs/absl/strings/internal-file.h
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namespace absl {} | ||
namespace std { | ||
struct string { | ||
string(const char *); | ||
~string(); | ||
}; | ||
} // namespace std | ||
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namespace absl { | ||
std::string StringsFunction(std::string s1) { return s1; } | ||
class SomeContainer {}; | ||
namespace strings_internal { | ||
void InternalFunction() {} | ||
template <class P> P InternalTemplateFunction(P a) {} | ||
} // namespace strings_internal | ||
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namespace container_internal { | ||
struct InternalStruct {}; | ||
} // namespace container_internal | ||
} // namespace absl | ||
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// should not trigger warnings because inside Abseil files | ||
void DirectAcessInternal() { | ||
absl::strings_internal::InternalFunction(); | ||
absl::strings_internal::InternalTemplateFunction<std::string>("a"); | ||
} | ||
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class FriendUsageInternal { | ||
friend struct absl::container_internal::InternalStruct; | ||
}; | ||
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namespace absl { | ||
void OpeningNamespaceInternally() { strings_internal::InternalFunction(); } | ||
} // namespace absl |
39 changes: 39 additions & 0 deletions
39
clang-tools-extra/test/clang-tidy/abseil-no-internal-dependencies.cpp
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// RUN: %check_clang_tidy %s abseil-no-internal-dependencies %t, -- -- -I %S/Inputs | ||
// RUN: clang-tidy -checks='-*, abseil-no-internal-dependencies' -header-filter='.*' %s -- -I %S/Inputs 2>&1 | FileCheck %s | ||
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#include "absl/strings/internal-file.h" | ||
// CHECK-NOT: warning: | ||
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#include "absl/external-file.h" | ||
// CHECK: absl/external-file.h:6:24: warning: do not reference any 'internal' namespaces; those implementation details are reserved to Abseil [abseil-no-internal-dependencies] | ||
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void DirectAcess() { | ||
absl::strings_internal::InternalFunction(); | ||
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not reference any 'internal' namespaces; those implementation details are reserved to Abseil | ||
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absl::strings_internal::InternalTemplateFunction<std::string>("a"); | ||
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not reference any 'internal' namespaces; those implementation details are reserved to Abseil | ||
} | ||
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class FriendUsage { | ||
friend struct absl::container_internal::InternalStruct; | ||
// CHECK-MESSAGES: :[[@LINE-1]]:17: warning: do not reference any 'internal' namespaces; those implementation details are reserved to Abseil | ||
}; | ||
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namespace absl { | ||
void OpeningNamespace() { | ||
strings_internal::InternalFunction(); | ||
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: do not reference any 'internal' namespaces; those implementation details are reserved to Abseil | ||
} | ||
} // namespace absl | ||
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// should not trigger warnings | ||
void CorrectUsage() { | ||
std::string Str = absl::StringsFunction("a"); | ||
absl::SomeContainer b; | ||
} | ||
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namespace absl { | ||
SomeContainer b; | ||
std::string Str = absl::StringsFunction("a"); | ||
} // namespace absl |