[AutoBump] Merge with 21ba91c4 (Jun 17) (81)

.github/workflows/pr-code-format.yml

@@ -54,7 +54,7 @@ jobs:
       - name: Install clang-format
         uses: aminya/setup-cpp@v1
         with:
-          clangformat: 18.1.1
+          clangformat: 18.1.7
 
       - name: Setup Python env
         uses: actions/setup-python@v5

clang/docs/ReleaseNotes.rst

@@ -268,6 +268,9 @@ Resolutions to C++ Defect Reports
 - Clang now requires a template argument list after a template keyword.
   (`CWG96: Syntactic disambiguation using the template keyword <https://cplusplus.github.io/CWG/issues/96.html>`_).
 
+- Clang now considers ``noexcept(typeid(expr))`` more carefully, instead of always assuming that ``std::bad_typeid`` can be thrown.
+  (`CWG2191: Incorrect result for noexcept(typeid(v)) <https://cplusplus.github.io/CWG/issues/2191.html>`_).
+
 C Language Changes
 ------------------
 
@@ -859,6 +862,8 @@ Bug Fixes to C++ Support
   (#GH88081), (#GH89496), (#GH90669) and (#GH91633).
 - Fixed handling of brace ellison when building deduction guides. (#GH64625), (#GH83368).
 - Clang now instantiates local constexpr functions eagerly for constant evaluators. (#GH35052), (#GH94849)
+- Fixed a failed assertion when attempting to convert an integer representing the difference
+  between the addresses of two labels (a GNU extension) to a pointer within a constant expression. (#GH95366).
 
 Bug Fixes to AST Handling
 ^^^^^^^^^^^^^^^^^^^^^^^^^

clang/include/clang/AST/ExprCXX.h

@@ -919,6 +919,10 @@ class CXXTypeidExpr : public Expr {
         reinterpret_cast<Stmt **>(&const_cast<CXXTypeidExpr *>(this)->Operand);
     return const_child_range(begin, begin + 1);
   }
+
+  /// Whether this is of a form like "typeid(*ptr)" that can throw a
+  /// std::bad_typeid if a pointer is a null pointer ([expr.typeid]p2)
+  bool hasNullCheck() const;
 };
 
 /// A member reference to an MSPropertyDecl.

clang/include/clang/Driver/Options.td

@@ -7036,6 +7036,12 @@ def as_secure_log_file : Separate<["-"], "as-secure-log-file">,
 
 } // let Visibility = [CC1Option, CC1AsOption]
 
+let Visibility = [CC1Option, FC1Option] in {
+def mlink_builtin_bitcode : Separate<["-"], "mlink-builtin-bitcode">,
+  HelpText<"Link and internalize needed symbols from the given bitcode file "
+           "before performing optimizations.">;
+} // let Visibility = [CC1Option, FC1Option]
+
 let Visibility = [CC1Option] in {
 
 def llvm_verify_each : Flag<["-"], "llvm-verify-each">,
@@ -7138,9 +7144,6 @@ defm constructor_aliases : BoolMOption<"constructor-aliases",
           " emitting complete constructors and destructors as aliases when possible">>;
 def mlink_bitcode_file : Separate<["-"], "mlink-bitcode-file">,
   HelpText<"Link the given bitcode file before performing optimizations.">;
-def mlink_builtin_bitcode : Separate<["-"], "mlink-builtin-bitcode">,
-  HelpText<"Link and internalize needed symbols from the given bitcode file "
-           "before performing optimizations.">;
 defm link_builtin_bitcode_postopt: BoolMOption<"link-builtin-bitcode-postopt",
   CodeGenOpts<"LinkBitcodePostopt">, DefaultFalse,
   PosFlag<SetTrue, [], [ClangOption], "Link builtin bitcodes after the "

clang/lib/AST/Expr.cpp

@@ -3769,10 +3769,18 @@ bool Expr::HasSideEffects(const ASTContext &Ctx,
     break;
   }
 
-  case CXXTypeidExprClass:
-    // typeid might throw if its subexpression is potentially-evaluated, so has
-    // side-effects in that case whether or not its subexpression does.
-    return cast<CXXTypeidExpr>(this)->isPotentiallyEvaluated();
+  case CXXTypeidExprClass: {
+    const auto *TE = cast<CXXTypeidExpr>(this);
+    if (!TE->isPotentiallyEvaluated())
+      return false;
+
+    // If this type id expression can throw because of a null pointer, that is a
+    // side-effect independent of if the operand has a side-effect
+    if (IncludePossibleEffects && TE->hasNullCheck())
+      return true;
+
+    break;
+  }
 
   case CXXConstructExprClass:
   case CXXTemporaryObjectExprClass: {

clang/lib/AST/ExprCXX.cpp

@@ -166,6 +166,53 @@ QualType CXXTypeidExpr::getTypeOperand(ASTContext &Context) const {
       Operand.get<TypeSourceInfo *>()->getType().getNonReferenceType(), Quals);
 }
 
+static bool isGLValueFromPointerDeref(const Expr *E) {
+  E = E->IgnoreParens();
+
+  if (const auto *CE = dyn_cast<CastExpr>(E)) {
+    if (!CE->getSubExpr()->isGLValue())
+      return false;
+    return isGLValueFromPointerDeref(CE->getSubExpr());
+  }
+
+  if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E))
+    return isGLValueFromPointerDeref(OVE->getSourceExpr());
+
+  if (const auto *BO = dyn_cast<BinaryOperator>(E))
+    if (BO->getOpcode() == BO_Comma)
+      return isGLValueFromPointerDeref(BO->getRHS());
+
+  if (const auto *ACO = dyn_cast<AbstractConditionalOperator>(E))
+    return isGLValueFromPointerDeref(ACO->getTrueExpr()) ||
+           isGLValueFromPointerDeref(ACO->getFalseExpr());
+
+  // C++11 [expr.sub]p1:
+  //   The expression E1[E2] is identical (by definition) to *((E1)+(E2))
+  if (isa<ArraySubscriptExpr>(E))
+    return true;
+
+  if (const auto *UO = dyn_cast<UnaryOperator>(E))
+    if (UO->getOpcode() == UO_Deref)
+      return true;
+
+  return false;
+}
+
+bool CXXTypeidExpr::hasNullCheck() const {
+  if (!isPotentiallyEvaluated())
+    return false;
+
+  // C++ [expr.typeid]p2:
+  //   If the glvalue expression is obtained by applying the unary * operator to
+  //   a pointer and the pointer is a null pointer value, the typeid expression
+  //   throws the std::bad_typeid exception.
+  //
+  // However, this paragraph's intent is not clear.  We choose a very generous
+  // interpretation which implores us to consider comma operators, conditional
+  // operators, parentheses and other such constructs.
+  return isGLValueFromPointerDeref(getExprOperand());
+}
+
 QualType CXXUuidofExpr::getTypeOperand(ASTContext &Context) const {
   assert(isTypeOperand() && "Cannot call getTypeOperand for __uuidof(expr)");
   Qualifiers Quals;

clang/lib/AST/ExprConstShared.h

@@ -14,6 +14,9 @@
 #ifndef LLVM_CLANG_LIB_AST_EXPRCONSTSHARED_H
 #define LLVM_CLANG_LIB_AST_EXPRCONSTSHARED_H
 
+namespace llvm {
+class APFloat;
+}
 namespace clang {
 class QualType;
 class LangOptions;
@@ -56,4 +59,8 @@ enum class GCCTypeClass {
 GCCTypeClass EvaluateBuiltinClassifyType(QualType T,
                                          const LangOptions &LangOpts);
 
+void HandleComplexComplexMul(llvm::APFloat A, llvm::APFloat B, llvm::APFloat C,
+                             llvm::APFloat D, llvm::APFloat &ResR,
+                             llvm::APFloat &ResI);
+
 #endif

clang/lib/AST/ExprConstant.cpp

@@ -9325,6 +9325,13 @@ bool PointerExprEvaluator::VisitCastExpr(const CastExpr *E) {
       Result.IsNullPtr = false;
       return true;
     } else {
+      // In rare instances, the value isn't an lvalue.
+      // For example, when the value is the difference between the addresses of
+      // two labels. We reject that as a constant expression because we can't
+      // compute a valid offset to convert into a pointer.
+      if (!Value.isLValue())
+        return false;
+
       // Cast is of an lvalue, no need to change value.
       Result.setFrom(Info.Ctx, Value);
       return true;
@@ -15126,6 +15133,62 @@ bool ComplexExprEvaluator::VisitCastExpr(const CastExpr *E) {
   llvm_unreachable("unknown cast resulting in complex value");
 }
 
+void HandleComplexComplexMul(APFloat A, APFloat B, APFloat C, APFloat D,
+                             APFloat &ResR, APFloat &ResI) {
+  // This is an implementation of complex multiplication according to the
+  // constraints laid out in C11 Annex G. The implementation uses the
+  // following naming scheme:
+  //   (a + ib) * (c + id)
+
+  APFloat AC = A * C;
+  APFloat BD = B * D;
+  APFloat AD = A * D;
+  APFloat BC = B * C;
+  ResR = AC - BD;
+  ResI = AD + BC;
+  if (ResR.isNaN() && ResI.isNaN()) {
+    bool Recalc = false;
+    if (A.isInfinity() || B.isInfinity()) {
+      A = APFloat::copySign(APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0),
+                            A);
+      B = APFloat::copySign(APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0),
+                            B);
+      if (C.isNaN())
+        C = APFloat::copySign(APFloat(C.getSemantics()), C);
+      if (D.isNaN())
+        D = APFloat::copySign(APFloat(D.getSemantics()), D);
+      Recalc = true;
+    }
+    if (C.isInfinity() || D.isInfinity()) {
+      C = APFloat::copySign(APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0),
+                            C);
+      D = APFloat::copySign(APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0),
+                            D);
+      if (A.isNaN())
+        A = APFloat::copySign(APFloat(A.getSemantics()), A);
+      if (B.isNaN())
+        B = APFloat::copySign(APFloat(B.getSemantics()), B);
+      Recalc = true;
+    }
+    if (!Recalc && (AC.isInfinity() || BD.isInfinity() || AD.isInfinity() ||
+                    BC.isInfinity())) {
+      if (A.isNaN())
+        A = APFloat::copySign(APFloat(A.getSemantics()), A);
+      if (B.isNaN())
+        B = APFloat::copySign(APFloat(B.getSemantics()), B);
+      if (C.isNaN())
+        C = APFloat::copySign(APFloat(C.getSemantics()), C);
+      if (D.isNaN())
+        D = APFloat::copySign(APFloat(D.getSemantics()), D);
+      Recalc = true;
+    }
+    if (Recalc) {
+      ResR = APFloat::getInf(A.getSemantics()) * (A * C - B * D);
+      ResI = APFloat::getInf(A.getSemantics()) * (A * D + B * C);
+    }
+  }
+}
+
 bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
   if (E->isPtrMemOp() || E->isAssignmentOp() || E->getOpcode() == BO_Comma)
     return ExprEvaluatorBaseTy::VisitBinaryOperator(E);
@@ -15225,55 +15288,7 @@ bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
             !handleFloatFloatBinOp(Info, E, ResI, BO_Mul, B))
           return false;
       } else {
-        // In the fully general case, we need to handle NaNs and infinities
-        // robustly.
-        APFloat AC = A * C;
-        APFloat BD = B * D;
-        APFloat AD = A * D;
-        APFloat BC = B * C;
-        ResR = AC - BD;
-        ResI = AD + BC;
-        if (ResR.isNaN() && ResI.isNaN()) {
-          bool Recalc = false;
-          if (A.isInfinity() || B.isInfinity()) {
-            A = APFloat::copySign(
-                APFloat(A.getSemantics(), A.isInfinity() ? 1 : 0), A);
-            B = APFloat::copySign(
-                APFloat(B.getSemantics(), B.isInfinity() ? 1 : 0), B);
-            if (C.isNaN())
-              C = APFloat::copySign(APFloat(C.getSemantics()), C);
-            if (D.isNaN())
-              D = APFloat::copySign(APFloat(D.getSemantics()), D);
-            Recalc = true;
-          }
-          if (C.isInfinity() || D.isInfinity()) {
-            C = APFloat::copySign(
-                APFloat(C.getSemantics(), C.isInfinity() ? 1 : 0), C);
-            D = APFloat::copySign(
-                APFloat(D.getSemantics(), D.isInfinity() ? 1 : 0), D);
-            if (A.isNaN())
-              A = APFloat::copySign(APFloat(A.getSemantics()), A);
-            if (B.isNaN())
-              B = APFloat::copySign(APFloat(B.getSemantics()), B);
-            Recalc = true;
-          }
-          if (!Recalc && (AC.isInfinity() || BD.isInfinity() ||
-                          AD.isInfinity() || BC.isInfinity())) {
-            if (A.isNaN())
-              A = APFloat::copySign(APFloat(A.getSemantics()), A);
-            if (B.isNaN())
-              B = APFloat::copySign(APFloat(B.getSemantics()), B);
-            if (C.isNaN())
-              C = APFloat::copySign(APFloat(C.getSemantics()), C);
-            if (D.isNaN())
-              D = APFloat::copySign(APFloat(D.getSemantics()), D);
-            Recalc = true;
-          }
-          if (Recalc) {
-            ResR = APFloat::getInf(A.getSemantics()) * (A * C - B * D);
-            ResI = APFloat::getInf(A.getSemantics()) * (A * D + B * C);
-          }
-        }
+        HandleComplexComplexMul(A, B, C, D, ResR, ResI);
       }
     } else {
       ComplexValue LHS = Result;

clang/lib/AST/Interp/ByteCodeExprGen.cpp

@@ -876,6 +876,22 @@ bool ByteCodeExprGen<Emitter>::VisitComplexBinOp(const BinaryOperator *E) {
   if (const auto *AT = RHSType->getAs<AtomicType>())
     RHSType = AT->getValueType();
 
+  // For ComplexComplex Mul, we have special ops to make their implementation
+  // easier.
+  BinaryOperatorKind Op = E->getOpcode();
+  if (Op == BO_Mul && LHSType->isAnyComplexType() &&
+      RHSType->isAnyComplexType()) {
+    assert(classifyPrim(LHSType->getAs<ComplexType>()->getElementType()) ==
+           classifyPrim(RHSType->getAs<ComplexType>()->getElementType()));
+    PrimType ElemT =
+        classifyPrim(LHSType->getAs<ComplexType>()->getElementType());
+    if (!this->visit(LHS))
+      return false;
+    if (!this->visit(RHS))
+      return false;
+    return this->emitMulc(ElemT, E);
+  }
+
   // Evaluate LHS and save value to LHSOffset.
   bool LHSIsComplex;
   unsigned LHSOffset;
@@ -919,38 +935,37 @@ bool ByteCodeExprGen<Emitter>::VisitComplexBinOp(const BinaryOperator *E) {
   // For both LHS and RHS, either load the value from the complex pointer, or
   // directly from the local variable. For index 1 (i.e. the imaginary part),
   // just load 0 and do the operation anyway.
-  auto loadComplexValue = [this](bool IsComplex, unsigned ElemIndex,
-                                 unsigned Offset, const Expr *E) -> bool {
+  auto loadComplexValue = [this](bool IsComplex, bool LoadZero,
+                                 unsigned ElemIndex, unsigned Offset,
+                                 const Expr *E) -> bool {
     if (IsComplex) {
       if (!this->emitGetLocal(PT_Ptr, Offset, E))
         return false;
       return this->emitArrayElemPop(classifyComplexElementType(E->getType()),
                                     ElemIndex, E);
     }
-    if (ElemIndex == 0)
+    if (ElemIndex == 0 || !LoadZero)
       return this->emitGetLocal(classifyPrim(E->getType()), Offset, E);
     return this->visitZeroInitializer(classifyPrim(E->getType()), E->getType(),
                                       E);
   };
 
   // Now we can get pointers to the LHS and RHS from the offsets above.
-  BinaryOperatorKind Op = E->getOpcode();
   for (unsigned ElemIndex = 0; ElemIndex != 2; ++ElemIndex) {
     // Result pointer for the store later.
     if (!this->DiscardResult) {
       if (!this->emitGetLocal(PT_Ptr, ResultOffset, E))
         return false;
     }
 
-    if (!loadComplexValue(LHSIsComplex, ElemIndex, LHSOffset, LHS))
-      return false;
-
-    if (!loadComplexValue(RHSIsComplex, ElemIndex, RHSOffset, RHS))
-      return false;
-
     // The actual operation.
     switch (Op) {
     case BO_Add:
+      if (!loadComplexValue(LHSIsComplex, true, ElemIndex, LHSOffset, LHS))
+        return false;
+
+      if (!loadComplexValue(RHSIsComplex, true, ElemIndex, RHSOffset, RHS))
+        return false;
       if (ResultElemT == PT_Float) {
         if (!this->emitAddf(getRoundingMode(E), E))
           return false;
@@ -960,6 +975,11 @@ bool ByteCodeExprGen<Emitter>::VisitComplexBinOp(const BinaryOperator *E) {
       }
       break;
     case BO_Sub:
+      if (!loadComplexValue(LHSIsComplex, true, ElemIndex, LHSOffset, LHS))
+        return false;
+
+      if (!loadComplexValue(RHSIsComplex, true, ElemIndex, RHSOffset, RHS))
+        return false;
       if (ResultElemT == PT_Float) {
         if (!this->emitSubf(getRoundingMode(E), E))
           return false;
@@ -968,6 +988,21 @@ bool ByteCodeExprGen<Emitter>::VisitComplexBinOp(const BinaryOperator *E) {
           return false;
       }
       break;
+    case BO_Mul:
+      if (!loadComplexValue(LHSIsComplex, false, ElemIndex, LHSOffset, LHS))
+        return false;
+
+      if (!loadComplexValue(RHSIsComplex, false, ElemIndex, RHSOffset, RHS))
+        return false;
+
+      if (ResultElemT == PT_Float) {
+        if (!this->emitMulf(getRoundingMode(E), E))
+          return false;
+      } else {
+        if (!this->emitMul(ResultElemT, E))
+          return false;
+      }
+      break;
 
     default:
       return false;