Merge commit 'cd4deef28e4361af19cd5a208ef51a5f0b26ee61' into feature/merge-upstream-20220110

Author: kaz7

.github/workflows/issue-subscriber.yml

@@ -0,0 +1,35 @@
+name: Issue Subscriber
+
+on:
+  issues:
+    types:
+      - labeled
+
+jobs:
+  auto-subscribe:
+    runs-on: ubuntu-latest
+    if: github.repository == 'llvm/llvm-project'
+    steps:
+    - name: Update watchers
+      uses: actions/github-script@v5
+      with:
+        github-token: ${{ secrets.ISSUE_MENTION_SECRET }}
+        script: |
+            const teamname = "issue-subscribers-" + context.payload.label.name.replace(/ /g, "-").replace(":","-").replace("/","-");
+            const comment = "@llvm/" + teamname;
+            try {
+              // This will throw an exception if the team does not exist and no
+              // comment will be created.
+              team = await github.rest.teams.getByName({
+                org: context.repo.owner,
+                team_slug: teamname
+              });
+              github.rest.issues.createComment({
+                issue_number: context.issue.number,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                body: comment
+              });
+            } catch (e){
+              console.log(e);
+            }

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp

@@ -719,7 +719,7 @@ void ClangTidyDiagnosticConsumer::checkFilters(SourceLocation Location,
   }
 
   if (!*Context.getOptions().SystemHeaders &&
-      Sources.isInSystemHeader(Location))
+      (Sources.isInSystemHeader(Location) || Sources.isInSystemMacro(Location)))
     return;
 
   // FIXME: We start with a conservative approach here, but the actual type of

clang-tools-extra/clang-tidy/abseil/DurationRewriter.h

@@ -138,4 +138,4 @@ AST_MATCHER_FUNCTION_P(ast_matchers::internal::Matcher<Stmt>,
 } // namespace tidy
 } // namespace clang
 
-#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_DURATIONCOMPARISONCHECK_H
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_ABSEIL_DURATIONREWRITER_H

clang-tools-extra/clang-tidy/add_new_check.py

@@ -324,16 +324,20 @@ def has_auto_fix(check_name):
     dirname, _, check_name = check_name.partition("-")
 
     checker_code = get_actual_filename(os.path.join(clang_tidy_path, dirname),
-                                       get_camel_name(check_name) + '.cpp')
-
+                                       get_camel_check_name(check_name) + '.cpp')
     if not os.path.isfile(checker_code):
-      return ""
+      # Some older checks don't end with 'Check.cpp'
+      checker_code = get_actual_filename(os.path.join(clang_tidy_path, dirname),
+                                         get_camel_name(check_name) + '.cpp')
+      if not os.path.isfile(checker_code):
+        return ''
 
     with io.open(checker_code, encoding='utf8') as f:
       code = f.read()
-      if 'FixItHint' in code or "ReplacementText" in code or "fixit" in code:
-        # Some simple heuristics to figure out if a checker has an autofix or not.
-        return ' "Yes"'
+      for needle in ['FixItHint', 'ReplacementText', 'fixit', 'TransformerClangTidyCheck']:
+        if needle in code:
+          # Some simple heuristics to figure out if a checker has an autofix or not.
+          return ' "Yes"'
     return ""
 
   def process_doc(doc_file):
@@ -416,7 +420,11 @@ def write_docs(module_path, module, check_name):
 
 def get_camel_name(check_name):
   return ''.join(map(lambda elem: elem.capitalize(),
-                     check_name.split('-'))) + 'Check'
+                     check_name.split('-')))
+
+
+def get_camel_check_name(check_name):
+  return get_camel_name(check_name) + 'Check'
 
 
 def main():
@@ -458,7 +466,7 @@ def main():
 
   module = args.module
   check_name = args.check
-  check_name_camel = get_camel_name(check_name)
+  check_name_camel = get_camel_check_name(check_name)
   if check_name.startswith(module):
     print('Check name "%s" must not start with the module "%s". Exiting.' % (
         check_name, module))

clang-tools-extra/clang-tidy/cert/NonTrivialTypesLibcMemoryCallsCheck.h

@@ -41,4 +41,4 @@ class NonTrivialTypesLibcMemoryCallsCheck : public ClangTidyCheck {
 } // namespace tidy
 } // namespace clang
 
-#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CERT_NOTTRIVIALTYPESLIBCMEMORYCALLSCHECK_H
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CERT_NONTRIVIALTYPESLIBCMEMORYCALLSCHECK_H

clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeVarargCheck.cpp

@@ -11,6 +11,9 @@
 #include "clang/ASTMatchers/ASTMatchFinder.h"
 #include "clang/ASTMatchers/ASTMatchers.h"
 #include "clang/Basic/TargetInfo.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/Token.h"
 
 using namespace clang::ast_matchers;
 
@@ -57,6 +60,10 @@ static constexpr StringRef AllowedVariadics[] = {
     // clang-format on
 };
 
+static constexpr StringRef VaArgWarningMessage =
+    "do not use va_arg to define c-style vararg functions; "
+    "use variadic templates instead";
+
 namespace {
 AST_MATCHER(QualType, isVAList) {
   ASTContext &Context = Finder->getASTContext();
@@ -106,6 +113,21 @@ AST_MATCHER_P(AdjustedType, hasOriginalType,
               ast_matchers::internal::Matcher<QualType>, InnerType) {
   return InnerType.matches(Node.getOriginalType(), Finder, Builder);
 }
+
+class VaArgPPCallbacks : public PPCallbacks {
+public:
+  VaArgPPCallbacks(ProTypeVarargCheck *Check) : Check(Check) {}
+
+  void MacroExpands(const Token &MacroNameTok, const MacroDefinition &MD,
+                    SourceRange Range, const MacroArgs *Args) override {
+    if (MacroNameTok.getIdentifierInfo()->getName() == "va_arg") {
+      Check->diag(MacroNameTok.getLocation(), VaArgWarningMessage);
+    }
+  }
+
+private:
+  ProTypeVarargCheck *Check;
+};
 } // namespace
 
 void ProTypeVarargCheck::registerMatchers(MatchFinder *Finder) {
@@ -125,6 +147,12 @@ void ProTypeVarargCheck::registerMatchers(MatchFinder *Finder) {
       this);
 }
 
+void ProTypeVarargCheck::registerPPCallbacks(const SourceManager &SM,
+                                             Preprocessor *PP,
+                                             Preprocessor *ModuleExpanderPP) {
+  PP->addPPCallbacks(std::make_unique<VaArgPPCallbacks>(this));
+}
+
 static bool hasSingleVariadicArgumentWithValue(const CallExpr *C, uint64_t I) {
   const auto *FDecl = dyn_cast<FunctionDecl>(C->getCalleeDecl());
   if (!FDecl)
@@ -153,9 +181,7 @@ void ProTypeVarargCheck::check(const MatchFinder::MatchResult &Result) {
   }
 
   if (const auto *Matched = Result.Nodes.getNodeAs<Expr>("va_use")) {
-    diag(Matched->getExprLoc(),
-         "do not use va_arg to define c-style vararg functions; "
-         "use variadic templates instead");
+    diag(Matched->getExprLoc(), VaArgWarningMessage);
   }
 
   if (const auto *Matched = Result.Nodes.getNodeAs<VarDecl>("va_list")) {

clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeVarargCheck.h

@@ -28,6 +28,8 @@ class ProTypeVarargCheck : public ClangTidyCheck {
     return LangOpts.CPlusPlus;
   }
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,
+                           Preprocessor *ModuleExpanderPP) override;
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
 };
 

clang-tools-extra/clang-tidy/cppcoreguidelines/VirtualClassDestructorCheck.cpp

@@ -173,11 +173,11 @@ void VirtualClassDestructorCheck::check(
          "destructor of %0 is private and prevents using the type")
         << MatchedClassOrStruct;
     diag(MatchedClassOrStruct->getLocation(),
-         /*FixDescription=*/"make it public and virtual", DiagnosticIDs::Note)
+         /*Description=*/"make it public and virtual", DiagnosticIDs::Note)
         << changePrivateDestructorVisibilityTo(
                "public", *Destructor, *Result.SourceManager, getLangOpts());
     diag(MatchedClassOrStruct->getLocation(),
-         /*FixDescription=*/"make it protected", DiagnosticIDs::Note)
+         /*Description=*/"make it protected", DiagnosticIDs::Note)
         << changePrivateDestructorVisibilityTo(
                "protected", *Destructor, *Result.SourceManager, getLangOpts());
 

clang-tools-extra/clang-tidy/misc/DefinitionsInHeadersCheck.cpp

@@ -130,7 +130,7 @@ void DefinitionsInHeadersCheck::check(const MatchFinder::MatchResult &Result) {
     // inline is not allowed for main function.
     if (FD->isMain())
       return;
-    diag(FD->getLocation(), /*FixDescription=*/"make as 'inline'",
+    diag(FD->getLocation(), /*Description=*/"make as 'inline'",
          DiagnosticIDs::Note)
         << FixItHint::CreateInsertion(FD->getInnerLocStart(), "inline ");
   } else if (const auto *VD = dyn_cast<VarDecl>(ND)) {

clang-tools-extra/clang-tidy/modernize/PassByValueCheck.cpp

@@ -105,6 +105,75 @@ static bool paramReferredExactlyOnce(const CXXConstructorDecl *Ctor,
   return ExactlyOneUsageVisitor(ParamDecl).hasExactlyOneUsageIn(Ctor);
 }
 
+/// Returns true if the given constructor is part of a lvalue/rvalue reference
+/// pair, i.e. `Param` is of lvalue reference type, and there exists another
+/// constructor such that:
+///  - it has the same number of parameters as `Ctor`.
+///  - the parameter at the same index as `Param` is an rvalue reference
+///    of the same pointee type
+///  - all other parameters have the same type as the corresponding parameter in
+///    `Ctor` or are rvalue references with the same pointee type.
+/// Examples:
+///  A::A(const B& Param)
+///  A::A(B&&)
+///
+///  A::A(const B& Param, const C&)
+///  A::A(B&& Param, C&&)
+///
+///  A::A(const B&, const C& Param)
+///  A::A(B&&, C&& Param)
+///
+///  A::A(const B&, const C& Param)
+///  A::A(const B&, C&& Param)
+///
+///  A::A(const B& Param, int)
+///  A::A(B&& Param, int)
+static bool hasRValueOverload(const CXXConstructorDecl *Ctor,
+                              const ParmVarDecl *Param) {
+  if (!Param->getType().getCanonicalType()->isLValueReferenceType()) {
+    // The parameter is passed by value.
+    return false;
+  }
+  const int ParamIdx = Param->getFunctionScopeIndex();
+  const CXXRecordDecl *Record = Ctor->getParent();
+
+  // Check whether a ctor `C` forms a pair with `Ctor` under the aforementionned
+  // rules.
+  const auto IsRValueOverload = [&Ctor, ParamIdx](const CXXConstructorDecl *C) {
+    if (C == Ctor || C->isDeleted() ||
+        C->getNumParams() != Ctor->getNumParams())
+      return false;
+    for (int I = 0, E = C->getNumParams(); I < E; ++I) {
+      const clang::QualType CandidateParamType =
+          C->parameters()[I]->getType().getCanonicalType();
+      const clang::QualType CtorParamType =
+          Ctor->parameters()[I]->getType().getCanonicalType();
+      const bool IsLValueRValuePair =
+          CtorParamType->isLValueReferenceType() &&
+          CandidateParamType->isRValueReferenceType() &&
+          CandidateParamType->getPointeeType()->getUnqualifiedDesugaredType() ==
+              CtorParamType->getPointeeType()->getUnqualifiedDesugaredType();
+      if (I == ParamIdx) {
+        // The parameter of interest must be paired.
+        if (!IsLValueRValuePair)
+          return false;
+      } else {
+        // All other parameters can be similar or paired.
+        if (!(CandidateParamType == CtorParamType || IsLValueRValuePair))
+          return false;
+      }
+    }
+    return true;
+  };
+
+  for (const auto *Candidate : Record->ctors()) {
+    if (IsRValueOverload(Candidate)) {
+      return true;
+    }
+  }
+  return false;
+}
+
 /// Find all references to \p ParamDecl across all of the
 /// redeclarations of \p Ctor.
 static SmallVector<const ParmVarDecl *, 2>
@@ -188,6 +257,10 @@ void PassByValueCheck::check(const MatchFinder::MatchResult &Result) {
           *Result.Context))
     return;
 
+  // Do not trigger if we find a paired constructor with an rvalue.
+  if (hasRValueOverload(Ctor, ParamDecl))
+    return;
+
   auto Diag = diag(ParamDecl->getBeginLoc(), "pass by value and use std::move");
 
   // If we received a `const&` type, we need to rewrite the function