Merge branch 'main' into dependent-new-fix

Author: awson

bolt/test/lit.local.cfg

@@ -1,6 +1,6 @@
 host_linux_triple = config.target_triple.split("-")[0] + "-unknown-linux-gnu"
-common_linker_flags = "-fuse-ld=lld -Wl,--unresolved-symbols=ignore-all"
-flags = f"--target={host_linux_triple} {common_linker_flags}"
+common_linker_flags = "-fuse-ld=lld -Wl,--unresolved-symbols=ignore-all -pie"
+flags = f"--target={host_linux_triple} -fPIE {common_linker_flags}"
 
 config.substitutions.insert(0, ("%cflags", f"%cflags {flags}"))
 config.substitutions.insert(0, ("%cxxflags", f"%cxxflags {flags}"))

bolt/test/perf2bolt/lit.local.cfg

@@ -1,4 +1,5 @@
 import shutil
+import subprocess
 
-if shutil.which("perf") is not None:
-    config.available_features.add("perf")
+if shutil.which("perf") is not None and subprocess.run(["perf", "record", "-e", "cycles:u", "-o", "/dev/null", "--", "perf", "--version"], capture_output=True).returncode == 0:
+    config.available_features.add("perf")

clang-tools-extra/CODE_OWNERS.TXT

@@ -23,7 +23,7 @@ D: clang-tidy
 
 N: Manuel Klimek
 E: [email protected]
-D: clang-rename, all parts of clang-tools-extra not covered by someone else
+D: all parts of clang-tools-extra not covered by someone else
 
 N: Sam McCall
 E: [email protected]

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

@@ -380,7 +380,6 @@ void ClangTidyDiagnosticConsumer::HandleDiagnostic(
     ++Context.Stats.ErrorsIgnoredNOLINT;
     // Ignored a warning, should ignore related notes as well
     LastErrorWasIgnored = true;
-    Context.DiagEngine->Clear();
     for (const auto &Error : SuppressionErrors)
       Context.diag(Error);
     return;
@@ -457,7 +456,6 @@ void ClangTidyDiagnosticConsumer::HandleDiagnostic(
   if (Info.hasSourceManager())
     checkFilters(Info.getLocation(), Info.getSourceManager());
 
-  Context.DiagEngine->Clear();
   for (const auto &Error : SuppressionErrors)
     Context.diag(Error);
 }

clang-tools-extra/clang-tidy/bugprone/ForwardingReferenceOverloadCheck.cpp

@@ -9,7 +9,6 @@
 #include "ForwardingReferenceOverloadCheck.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
-#include <algorithm>
 
 using namespace clang::ast_matchers;
 
@@ -19,14 +18,14 @@ namespace {
 // Check if the given type is related to std::enable_if.
 AST_MATCHER(QualType, isEnableIf) {
   auto CheckTemplate = [](const TemplateSpecializationType *Spec) {
-    if (!Spec || !Spec->getTemplateName().getAsTemplateDecl()) {
+    if (!Spec)
       return false;
-    }
-    const NamedDecl *TypeDecl =
-        Spec->getTemplateName().getAsTemplateDecl()->getTemplatedDecl();
-    return TypeDecl->isInStdNamespace() &&
-           (TypeDecl->getName() == "enable_if" ||
-            TypeDecl->getName() == "enable_if_t");
+
+    const TemplateDecl *TDecl = Spec->getTemplateName().getAsTemplateDecl();
+
+    return TDecl && TDecl->isInStdNamespace() &&
+           (TDecl->getName() == "enable_if" ||
+            TDecl->getName() == "enable_if_t");
   };
   const Type *BaseType = Node.getTypePtr();
   // Case: pointer or reference to enable_if.

clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.cpp

@@ -48,6 +48,8 @@ AST_MATCHER_P2(Expr, hasSizeOfDescendant, int, Depth,
   return false;
 }
 
+AST_MATCHER(Expr, offsetOfExpr) { return isa<OffsetOfExpr>(Node); }
+
 CharUnits getSizeOfType(const ASTContext &Ctx, const Type *Ty) {
   if (!Ty || Ty->isIncompleteType() || Ty->isDependentType() ||
       isa<DependentSizedArrayType>(Ty) || !Ty->isConstantSizeType())
@@ -221,17 +223,15 @@ void SizeofExpressionCheck::registerMatchers(MatchFinder *Finder) {
   const auto ElemType =
       arrayType(hasElementType(recordType().bind("elem-type")));
   const auto ElemPtrType = pointerType(pointee(type().bind("elem-ptr-type")));
+  const auto SizeofDivideExpr = binaryOperator(
+      hasOperatorName("/"),
+      hasLHS(
+          ignoringParenImpCasts(sizeOfExpr(hasArgumentOfType(hasCanonicalType(
+              type(anyOf(ElemType, ElemPtrType, type())).bind("num-type")))))),
+      hasRHS(ignoringParenImpCasts(sizeOfExpr(
+          hasArgumentOfType(hasCanonicalType(type().bind("denom-type")))))));
 
-  Finder->addMatcher(
-      binaryOperator(
-          hasOperatorName("/"),
-          hasLHS(ignoringParenImpCasts(sizeOfExpr(hasArgumentOfType(
-              hasCanonicalType(type(anyOf(ElemType, ElemPtrType, type()))
-                                   .bind("num-type")))))),
-          hasRHS(ignoringParenImpCasts(sizeOfExpr(
-              hasArgumentOfType(hasCanonicalType(type().bind("denom-type")))))))
-          .bind("sizeof-divide-expr"),
-      this);
+  Finder->addMatcher(SizeofDivideExpr.bind("sizeof-divide-expr"), this);
 
   // Detect expression like: sizeof(...) * sizeof(...)); most likely an error.
   Finder->addMatcher(binaryOperator(hasOperatorName("*"),
@@ -257,8 +257,9 @@ void SizeofExpressionCheck::registerMatchers(MatchFinder *Finder) {
                          .bind("sizeof-sizeof-expr"),
                      this);
 
-  // Detect sizeof in pointer arithmetic like: N * sizeof(S) == P1 - P2 or
-  // (P1 - P2) / sizeof(S) where P1 and P2 are pointers to type S.
+  // Detect sizeof usage in comparisons involving pointer arithmetics, such as
+  // N * sizeof(T) == P1 - P2 or (P1 - P2) / sizeof(T), where P1 and P2 are
+  // pointers to a type T.
   const auto PtrDiffExpr = binaryOperator(
       hasOperatorName("-"),
       hasLHS(hasType(hasUnqualifiedDesugaredType(pointerType(pointee(
@@ -285,6 +286,47 @@ void SizeofExpressionCheck::registerMatchers(MatchFinder *Finder) {
           hasRHS(ignoringParenImpCasts(SizeOfExpr.bind("sizeof-ptr-div-expr"))))
           .bind("sizeof-in-ptr-arithmetic-div"),
       this);
+
+  // SEI CERT ARR39-C. Do not add or subtract a scaled integer to a pointer.
+  // Detect sizeof, alignof and offsetof usage in pointer arithmetics where
+  // they are used to scale the numeric distance, which is scaled again by
+  // the pointer arithmetic operator. This can result in forming invalid
+  // offsets.
+  //
+  // Examples, where P is a pointer, N is some integer (both compile-time and
+  // run-time): P + sizeof(T), P + sizeof(*P), P + N * sizeof(*P).
+  //
+  // This check does not warn on cases where the pointee type is "1 byte",
+  // as those cases can often come from generics and also do not constitute a
+  // problem because the size does not affect the scale used.
+  const auto InterestingPtrTyForPtrArithmetic =
+      pointerType(pointee(qualType().bind("pointee-type")));
+  const auto SizeofLikeScaleExpr =
+      expr(anyOf(unaryExprOrTypeTraitExpr(ofKind(UETT_SizeOf)),
+                 unaryExprOrTypeTraitExpr(ofKind(UETT_AlignOf)),
+                 offsetOfExpr()))
+          .bind("sizeof-in-ptr-arithmetic-scale-expr");
+  const auto PtrArithmeticIntegerScaleExpr = binaryOperator(
+      hasAnyOperatorName("*", "/"),
+      // sizeof(...) * sizeof(...) and sizeof(...) / sizeof(...) is handled
+      // by this check on another path.
+      hasOperands(expr(hasType(isInteger()), unless(SizeofLikeScaleExpr)),
+                  SizeofLikeScaleExpr));
+  const auto PtrArithmeticScaledIntegerExpr =
+      expr(anyOf(SizeofLikeScaleExpr, PtrArithmeticIntegerScaleExpr),
+           unless(SizeofDivideExpr));
+
+  Finder->addMatcher(
+      expr(anyOf(
+          binaryOperator(hasAnyOperatorName("+", "-"),
+                         hasOperands(hasType(InterestingPtrTyForPtrArithmetic),
+                                     PtrArithmeticScaledIntegerExpr))
+              .bind("sizeof-in-ptr-arithmetic-plusminus"),
+          binaryOperator(hasAnyOperatorName("+=", "-="),
+                         hasLHS(hasType(InterestingPtrTyForPtrArithmetic)),
+                         hasRHS(PtrArithmeticScaledIntegerExpr))
+              .bind("sizeof-in-ptr-arithmetic-plusminus"))),
+      this);
 }
 
 void SizeofExpressionCheck::check(const MatchFinder::MatchResult &Result) {
@@ -409,6 +451,43 @@ void SizeofExpressionCheck::check(const MatchFinder::MatchResult &Result) {
           << SizeOfExpr->getSourceRange() << E->getOperatorLoc()
           << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
     }
+  } else if (const auto *E = Result.Nodes.getNodeAs<BinaryOperator>(
+                 "sizeof-in-ptr-arithmetic-plusminus")) {
+    const auto *PointeeTy = Result.Nodes.getNodeAs<QualType>("pointee-type");
+    const auto *ScaleExpr =
+        Result.Nodes.getNodeAs<Expr>("sizeof-in-ptr-arithmetic-scale-expr");
+    const CharUnits PointeeSize = getSizeOfType(Ctx, PointeeTy->getTypePtr());
+    const int ScaleKind = [ScaleExpr]() {
+      if (const auto *UTTE = dyn_cast<UnaryExprOrTypeTraitExpr>(ScaleExpr))
+        switch (UTTE->getKind()) {
+        case UETT_SizeOf:
+          return 0;
+        case UETT_AlignOf:
+          return 1;
+        default:
+          return -1;
+        }
+
+      if (isa<OffsetOfExpr>(ScaleExpr))
+        return 2;
+
+      return -1;
+    }();
+
+    if (ScaleKind != -1 && PointeeSize > CharUnits::One()) {
+      diag(E->getExprLoc(),
+           "suspicious usage of '%select{sizeof|alignof|offsetof}0(...)' in "
+           "pointer arithmetic; this scaled value will be scaled again by the "
+           "'%1' operator")
+          << ScaleKind << E->getOpcodeStr() << ScaleExpr->getSourceRange();
+      diag(E->getExprLoc(),
+           "'%0' in pointer arithmetic internally scales with 'sizeof(%1)' == "
+           "%2",
+           DiagnosticIDs::Note)
+          << E->getOpcodeStr()
+          << PointeeTy->getAsString(Ctx.getPrintingPolicy())
+          << PointeeSize.getQuantity();
+    }
   }
 }
 

clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.h

@@ -13,7 +13,7 @@
 
 namespace clang::tidy::bugprone {
 
-/// Find suspicious usages of sizeof expression.
+/// Find suspicious usages of sizeof expressions.
 ///
 /// For the user-facing documentation see:
 /// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/sizeof-expression.html

clang-tools-extra/clang-tidy/cert/CERTTidyModule.cpp

@@ -14,6 +14,7 @@
 #include "../bugprone/ReservedIdentifierCheck.h"
 #include "../bugprone/SignalHandlerCheck.h"
 #include "../bugprone/SignedCharMisuseCheck.h"
+#include "../bugprone/SizeofExpressionCheck.h"
 #include "../bugprone/SpuriouslyWakeUpFunctionsCheck.h"
 #include "../bugprone/SuspiciousMemoryComparisonCheck.h"
 #include "../bugprone/UnhandledSelfAssignmentCheck.h"
@@ -281,6 +282,9 @@ class CERTModule : public ClangTidyModule {
         "cert-oop58-cpp");
 
     // C checkers
+    // ARR
+    CheckFactories.registerCheck<bugprone::SizeofExpressionCheck>(
+        "cert-arr39-c");
     // CON
     CheckFactories.registerCheck<bugprone::SpuriouslyWakeUpFunctionsCheck>(
         "cert-con36-c");
@@ -332,6 +336,12 @@ class CERTModule : public ClangTidyModule {
   ClangTidyOptions getModuleOptions() override {
     ClangTidyOptions Options;
     ClangTidyOptions::OptionMap &Opts = Options.CheckOptions;
+    Opts["cert-arr39-c.WarnOnSizeOfConstant"] = "false";
+    Opts["cert-arr39-c.WarnOnSizeOfIntegerExpression"] = "false";
+    Opts["cert-arr39-c.WarnOnSizeOfThis"] = "false";
+    Opts["cert-arr39-c.WarnOnSizeOfCompareToConstant"] = "false";
+    Opts["cert-arr39-c.WarnOnSizeOfPointer"] = "false";
+    Opts["cert-arr39-c.WarnOnSizeOfPointerToAggregate"] = "false";
     Opts["cert-dcl16-c.NewSuffixes"] = "L;LL;LU;LLU";
     Opts["cert-err33-c.CheckedFunctions"] = CertErr33CCheckedFunctions;
     Opts["cert-err33-c.AllowCastToVoid"] = "true";

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

@@ -102,7 +102,7 @@ void DefinitionsInHeadersCheck::check(const MatchFinder::MatchResult &Result) {
     // inline is not allowed for main function.
     if (FD->isMain())
       return;
-    diag(FD->getLocation(), /*Description=*/"make as 'inline'",
+    diag(FD->getLocation(), "mark the definition as 'inline'",
          DiagnosticIDs::Note)
         << FixItHint::CreateInsertion(FD->getInnerLocStart(), "inline ");
   } else if (const auto *VD = dyn_cast<VarDecl>(ND)) {

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

@@ -9,6 +9,7 @@
 #include "AvoidCArraysCheck.h"
 #include "clang/AST/ASTContext.h"
 #include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
 
 using namespace clang::ast_matchers;
 
@@ -60,6 +61,7 @@ void AvoidCArraysCheck::registerMatchers(MatchFinder *Finder) {
 
   Finder->addMatcher(
       typeLoc(hasValidBeginLoc(), hasType(arrayType()),
+              optionally(hasParent(parmVarDecl().bind("param_decl"))),
               unless(anyOf(hasParent(parmVarDecl(isArgvOfMain())),
                            hasParent(varDecl(isExternC())),
                            hasParent(fieldDecl(
@@ -72,11 +74,28 @@ void AvoidCArraysCheck::registerMatchers(MatchFinder *Finder) {
 
 void AvoidCArraysCheck::check(const MatchFinder::MatchResult &Result) {
   const auto *ArrayType = Result.Nodes.getNodeAs<TypeLoc>("typeloc");
-
+  const bool IsInParam =
+      Result.Nodes.getNodeAs<ParmVarDecl>("param_decl") != nullptr;
+  const bool IsVLA = ArrayType->getTypePtr()->isVariableArrayType();
+  enum class RecommendType { Array, Vector, Span };
+  llvm::SmallVector<const char *> RecommendTypes{};
+  if (IsVLA) {
+    RecommendTypes.push_back("std::vector<>");
+  } else if (ArrayType->getTypePtr()->isIncompleteArrayType() && IsInParam) {
+    // in function parameter, we also don't know the size of
+    // IncompleteArrayType.
+    if (Result.Context->getLangOpts().CPlusPlus20)
+      RecommendTypes.push_back("std::span<>");
+    else {
+      RecommendTypes.push_back("std::array<>");
+      RecommendTypes.push_back("std::vector<>");
+    }
+  } else {
+    RecommendTypes.push_back("std::array<>");
+  }
   diag(ArrayType->getBeginLoc(),
-       "do not declare %select{C-style|C VLA}0 arrays, use "
-       "%select{std::array<>|std::vector<>}0 instead")
-      << ArrayType->getTypePtr()->isVariableArrayType();
+       "do not declare %select{C-style|C VLA}0 arrays, use %1 instead")
+      << IsVLA << llvm::join(RecommendTypes, " or ");
 }
 
 } // namespace clang::tidy::modernize