diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression.cpp
@@ -124,8 +124,6 @@ int Test1(const char* ptr) {
   // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: suspicious usage of sizeof pointer 'sizeof(P*)/sizeof(Q*)'
   sum += sizeof(ptr) / sizeof(char);
   // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: suspicious usage of sizeof pointer 'sizeof(T*)/sizeof(T)'
-  sum += sizeof(ptr) / sizeof(ptr[0]);
-  // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: suspicious usage of sizeof pointer 'sizeof(T*)/sizeof(T)'
   sum += sizeof(int) * sizeof(char);
   // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: suspicious 'sizeof' by 'sizeof' multiplication
   sum += sizeof(ptr) * sizeof(ptr[0]);
@@ -207,50 +205,57 @@ int Test5() {
   C *PtrArray[10];
   C *PC;
 
+  char *PChar;
+  int *PInt, **PPInt;
+  MyStruct **PPMyStruct;
+
   int sum = 0;
   sum += sizeof(&S.arr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(&kGlocalMyStruct.arr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(&kGlocalMyStructPtr->arr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(S.arr + 0);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(+ S.arr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof((int*)S.arr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
 
   sum += sizeof(S.ptr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(kGlocalMyStruct.ptr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(kGlocalMyStructPtr->ptr);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
 
   sum += sizeof(&kGlocalMyStruct);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(&S);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(MyStruct*);
   sum += sizeof(PMyStruct);
   sum += sizeof(PS);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(PS2);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(&A10);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(PtrArray) / sizeof(PtrArray[1]);
-  // CHECK-MESSAGES: :[[@LINE-1]]:29: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:29: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   sum += sizeof(A10) / sizeof(PtrArray[0]);
-  // CHECK-MESSAGES: :[[@LINE-1]]:24: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
   sum += sizeof(PC) / sizeof(PtrArray[0]);
-  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+  // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
   // CHECK-MESSAGES: :[[@LINE-2]]:21: warning: suspicious usage of sizeof pointer 'sizeof(T)/sizeof(T)'
-  // CHECK-MESSAGES: :[[@LINE-3]]:23: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
   sum += sizeof(ArrayC) / sizeof(PtrArray[0]);
   // CHECK-MESSAGES: :[[@LINE-1]]:25: warning: suspicious usage of 'sizeof(...)/sizeof(...)'; numerator is not a multiple of denominator
-  // CHECK-MESSAGES: :[[@LINE-2]]:27: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+
+  // These pointers do not point to aggregate types, so they are not reported in this mode:
+  sum += sizeof(PChar);
+  sum += sizeof(PInt);
+  sum += sizeof(PPInt);
+  sum += sizeof(PPMyStruct);
 
   return sum;
 }
@@ -293,6 +298,32 @@ bool Baz() { return sizeof(A) < N; }
 // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: suspicious comparison of 'sizeof(expr)' to a constant
 bool Test7() { return Baz<-1>(); }
 
+void some_generic_function(const void *arg, int argsize);
+int *IntP, **IntPP;
+C *ClassP, **ClassPP;
+
+void GenericFunctionTest() {
+  // The `sizeof(pointer)` checks ignore situations where the pointer is
+  // produced by dereferencing a pointer-to-pointer, because this is unlikely
+  // to be an accident and can appear in legitimate code that tries to call
+  // a generic function which emulates dynamic typing within C.
+  some_generic_function(IntPP, sizeof(*IntPP));
+  some_generic_function(ClassPP, sizeof(*ClassPP));
+  // Using `...[0]` instead of the dereference operator is another common
+  // variant, which is also widespread in the idiomatic array-size calculation:
+  // `sizeof(array) / sizeof(array[0])`.
+  some_generic_function(IntPP, sizeof(IntPP[0]));
+  some_generic_function(ClassPP, sizeof(ClassPP[0]));
+  // FIXME: There is a third common pattern where the generic function is
+  // called with `&Variable` and `sizeof(Variable)`. Right now these are
+  // reported by the `sizeof(pointer)` checks, but this causes some false
+  // positives, so it would be good to create an exception for them.
+  // NOTE: `sizeof(IntP)` is only reported with `WarnOnSizeOfPointer=true`.
+  some_generic_function(&IntPP, sizeof(IntP));
+  some_generic_function(&ClassPP, sizeof(ClassP));
+  // CHECK-MESSAGES: :[[@LINE-1]]:35: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+}
+
 int ValidExpressions() {
   int A[] = {1, 2, 3, 4};
   static const char str[] = "hello";

diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/func.h b/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/func.h
@@ -0,0 +1,5 @@
+#pragma once
+
+void func_header();
+
+#include "func_h.inc"
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/func_cpp.inc b/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/func_cpp.inc
@@ -0,0 +1 @@
+void func_cpp_inc();
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/func_h.inc b/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/func_h.inc
@@ -0,0 +1 @@
+void func_h_inc();
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/var.h b/clang-tools-extra/test/clang-tidy/checkers/misc/Inputs/use-internal-linkage/var.h
@@ -0,0 +1,3 @@
+#pragma once
+
+extern int gloabl_header;
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/header-include-cycle.self.cpp b/clang-tools-extra/test/clang-tidy/checkers/misc/header-include-cycle.self.cpp
@@ -0,0 +1,3 @@
+// RUN: not clang-tidy %s -checks='-*,misc-header-include-cycle'
+
+#include "header-include-cycle.self.cpp"
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-func.cpp b/clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-func.cpp
@@ -0,0 +1,37 @@
+// RUN: %check_clang_tidy %s misc-use-internal-linkage %t -- -- -I%S/Inputs/use-internal-linkage
+
+#include "func.h"
+
+void func() {}
+// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: function 'func'
+
+template<class T>
+void func_template() {}
+// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: function 'func_template'
+
+void func_cpp_inc();
+// CHECK-MESSAGES: :[[@LINE-1]]:6: warning: function 'func_cpp_inc'
+
+#include "func_cpp.inc"
+
+void func_h_inc();
+
+struct S {
+  void method();
+};
+void S::method() {}
+
+void func_header();
+extern void func_extern();
+static void func_static();
+namespace {
+void func_anonymous_ns();
+} // namespace
+
+int main(int argc, const char*argv[]) {}
+
+extern "C" {
+void func_extern_c_1() {}
+}
+
+extern "C" void func_extern_c_2() {}
diff --git a/clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-var.cpp b/clang-tools-extra/test/clang-tidy/checkers/misc/use-internal-linkage-var.cpp
@@ -0,0 +1,40 @@
+// RUN: %check_clang_tidy %s misc-use-internal-linkage %t -- -- -I%S/Inputs/use-internal-linkage
+
+#include "var.h"
+
+int global;
+// CHECK-MESSAGES: :[[@LINE-1]]:5: warning: variable 'global'
+
+template<class T>
+T global_template;
+// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: variable 'global_template'
+
+int gloabl_header;
+
+extern int global_extern;
+
+static int global_static;
+
+namespace {
+static int global_anonymous_ns;
+namespace NS {
+static int global_anonymous_ns;
+}
+}
+
+static void f(int para) {
+  int local;
+  static int local_static;
+}
+
+struct S {
+  int m1;
+  static int m2;
+};
+int S::m2;
+
+extern "C" {
+int global_in_extern_c_1;
+}
+
+extern "C" int global_in_extern_c_2;
diff --git a/clang-tools-extra/test/clang-tidy/checkers/modernize/use-designated-initializers.cpp b/clang-tools-extra/test/clang-tidy/checkers/modernize/use-designated-initializers.cpp
@@ -1,13 +1,13 @@
-// RUN: %check_clang_tidy -std=c++17 %s modernize-use-designated-initializers %t \
+// RUN: %check_clang_tidy -std=c++20 %s modernize-use-designated-initializers %t \
 // RUN:     -- \
 // RUN:     -- -fno-delayed-template-parsing
-// RUN: %check_clang_tidy -check-suffixes=,SINGLE-ELEMENT -std=c++17 %s modernize-use-designated-initializers %t \
+// RUN: %check_clang_tidy -check-suffixes=,SINGLE-ELEMENT -std=c++20 %s modernize-use-designated-initializers %t \
 // RUN:     -- -config="{CheckOptions: {modernize-use-designated-initializers.IgnoreSingleElementAggregates: false}}" \
 // RUN:     -- -fno-delayed-template-parsing
-// RUN: %check_clang_tidy -check-suffixes=POD -std=c++17 %s modernize-use-designated-initializers %t \
+// RUN: %check_clang_tidy -check-suffixes=POD -std=c++20 %s modernize-use-designated-initializers %t \
 // RUN:     -- -config="{CheckOptions: {modernize-use-designated-initializers.RestrictToPODTypes: true}}" \
 // RUN:     -- -fno-delayed-template-parsing
-// RUN: %check_clang_tidy -check-suffixes=,MACROS -std=c++17 %s modernize-use-designated-initializers %t \
+// RUN: %check_clang_tidy -check-suffixes=,MACROS -std=c++20 %s modernize-use-designated-initializers %t \
 // RUN:     -- -config="{CheckOptions: {modernize-use-designated-initializers.IgnoreMacros: false}}" \
 // RUN:     -- -fno-delayed-template-parsing
 

diff --git a/clang-tools-extra/test/clang-tidy/checkers/performance/unnecessary-copy-initialization.cpp b/clang-tools-extra/test/clang-tidy/checkers/performance/unnecessary-copy-initialization.cpp
@@ -32,6 +32,9 @@ struct ExpensiveToCopyType {
 
 template <typename T>
 struct Container {
+  using reference = T&;
+  using const_reference = const T&;
+
   bool empty() const;
   const T& operator[](int) const;
   const T& operator[](int);
@@ -42,8 +45,8 @@ struct Container {
   void nonConstMethod();
   bool constMethod() const;
 
-  const T& at(int) const;
-  T& at(int);
+  reference at(int) const;
+  const_reference at(int);
 
 };
 
@@ -207,6 +210,28 @@ void PositiveOperatorCallConstValueParam(const Container<ExpensiveToCopyType> C)
   VarCopyConstructed.constMethod();
 }
 
+void PositiveOperatorValueParam(Container<ExpensiveToCopyType> C) {
+  const auto AutoAssigned = C[42];
+  // CHECK-MESSAGES: [[@LINE-1]]:14: warning: the const qualified variable 'AutoAssigned'
+  // CHECK-FIXES: const auto& AutoAssigned = C[42];
+  AutoAssigned.constMethod();
+
+  const auto AutoCopyConstructed(C[42]);
+  // CHECK-MESSAGES: [[@LINE-1]]:14: warning: the const qualified variable 'AutoCopyConstructed'
+  // CHECK-FIXES: const auto& AutoCopyConstructed(C[42]);
+  AutoCopyConstructed.constMethod();
+
+  const ExpensiveToCopyType VarAssigned = C.at(42);
+  // CHECK-MESSAGES: [[@LINE-1]]:29: warning: the const qualified variable 'VarAssigned'
+  // CHECK-FIXES: const ExpensiveToCopyType& VarAssigned = C.at(42);
+  VarAssigned.constMethod();
+
+  const ExpensiveToCopyType VarCopyConstructed(C.at(42));
+  // CHECK-MESSAGES: [[@LINE-1]]:29: warning: the const qualified variable 'VarCopyConstructed'
+  // CHECK-FIXES: const ExpensiveToCopyType& VarCopyConstructed(C.at(42));
+  VarCopyConstructed.constMethod();
+}
+
 void PositiveOperatorCallConstValueParamAlias(const ExpensiveToCopyContainerAlias C) {
   const auto AutoAssigned = C[42];
   // CHECK-MESSAGES: [[@LINE-1]]:14: warning: the const qualified variable 'AutoAssigned'

diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/container-size-empty.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/container-size-empty.cpp
@@ -889,3 +889,9 @@ namespace PR88203 {
     // CHECK-FIXES: {{^    }}if (s.empty()) {}{{$}}
   }
 }
+
+namespace PR94454 {
+  template <char...>
+  int operator""_ci() { return 0; }
+  auto eq = 0_ci == 0;
+}
diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/implicit-bool-conversion-cxx20.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/implicit-bool-conversion-cxx20.cpp
@@ -0,0 +1,31 @@
+// RUN: %check_clang_tidy -std=c++20 %s readability-implicit-bool-conversion %t
+
+namespace std {
+struct strong_ordering {
+  int n;
+  constexpr operator int() const { return n; }
+  static const strong_ordering equal, greater, less;
+};
+constexpr strong_ordering strong_ordering::equal = {0};
+constexpr strong_ordering strong_ordering::greater = {1};
+constexpr strong_ordering strong_ordering::less = {-1};
+} // namespace std
+
+namespace PR93409 {
+  struct X
+  {
+      auto operator<=>(const X&) const = default;
+      bool m_b;
+  };
+
+  struct Y
+  {
+      auto operator<=>(const Y&) const = default;
+      X m_x;
+  };
+
+  bool compare(const Y& y1, const Y& y2)
+  {
+     return y1 == y2 || y1 < y2 || y1 > y2;
+  }
+}
diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/math-missing-parentheses.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/math-missing-parentheses.cpp
@@ -140,3 +140,20 @@ void f(){
     //CHECK-MESSAGES: :[[@LINE+1]]:13: warning: '*' has higher precedence than '+'; add parentheses to explicitly specify the order of operations [readability-math-missing-parentheses]
     int v = FUN5(0 + 1);
 }
+
+namespace PR92516 {
+  void f(int i) {
+    int j, k;
+    for (j = i + 1, k = 0; j < 1; ++j) {}
+  }
+
+  void f2(int i) {
+    int j;
+    for (j = i + 1; j < 1; ++j) {}
+  }
+
+  void f3(int i) {
+    int j;
+    for (j = i + 1, 2; j < 1; ++j) {}
+  }
+}
diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability/redundant-member-init.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/redundant-member-init.cpp
@@ -302,3 +302,19 @@ struct D7 {
 
 D7<int> d7i;
 D7<S> d7s;
+
+struct SS {
+  SS() = default;
+  SS(S s) : s(s) {}
+
+  S s;
+};
+
+struct D8 {
+  SS ss = S();
+};
+
+struct D9 {
+  D9() : ss(S()) {}
+  SS ss;
+};
diff --git a/clang-tools-extra/unittests/clang-tidy/DeclRefExprUtilsTest.cpp b/clang-tools-extra/unittests/clang-tidy/DeclRefExprUtilsTest.cpp
@@ -46,6 +46,7 @@ template <int Indirections> void RunTest(StringRef Snippet) {
   StringRef CommonCode = R"(
     struct ConstTag{};
     struct NonConstTag{};
+    struct Tag1{};
 
     struct S {
       void constMethod() const;
@@ -59,6 +60,13 @@ template <int Indirections> void RunTest(StringRef Snippet) {
       void operator[](int);
       void operator[](int) const;
 
+      int& at(int);
+      const int& at(int) const;
+      const int& at(Tag1);
+
+      int& weird_overload();
+      const double& weird_overload() const;
+
       bool operator==(const S&) const;
 
       int int_member;
@@ -161,9 +169,11 @@ TEST(ConstReferenceDeclRefExprsTest, ConstRefVar) {
       useIntConstRef(/*const*/target.int_member);
       useIntPtr(/*const*/target.ptr_member);
       useIntConstPtr(&/*const*/target.int_member);
+      (void)/*const*/target.at(3);
 
       const S& const_target_ref = /*const*/target;
       const S* const_target_ptr = &/*const*/target;
+      (void)/*const*/target.at(3);
     }
 )");
 }
@@ -187,7 +197,7 @@ TEST(ConstReferenceDeclRefExprsTest, ValueVar) {
       /*const*/target.staticMethod();
       target.nonConstMethod();
       /*const*/target(ConstTag{});
-      target[42];
+      /*const*/target[42];
       /*const*/target(ConstTag{});
       target(NonConstTag{});
       useRef(target);
@@ -211,6 +221,14 @@ TEST(ConstReferenceDeclRefExprsTest, ValueVar) {
       const S& const_target_ref = /*const*/target;
       const S* const_target_ptr = &/*const*/target;
       S* target_ptr = &target;
+
+      (void)/*const*/target.at(3);
+      ++target.at(3);
+      const int civ = /*const*/target.at(3);
+      const int& cir = /*const*/target.at(3);
+      int& ir = target.at(3);
+      target.at(Tag1{});
+      target.weird_overload();
     }
 )");
 }
@@ -227,7 +245,7 @@ TEST(ConstReferenceDeclRefExprsTest, RefVar) {
       /*const*/target.staticMethod();
       target.nonConstMethod();
       /*const*/target(ConstTag{});
-      target[42];
+      /*const*/target[42];
       useConstRef((/*const*/target));
       (/*const*/target).constMethod();
       (void)(/*const*/target == /*const*/target);
@@ -249,6 +267,14 @@ TEST(ConstReferenceDeclRefExprsTest, RefVar) {
       const S& const_target_ref = /*const*/target;
       const S* const_target_ptr = &/*const*/target;
       S* target_ptr = &target;
+
+      (void)/*const*/target.at(3);
+      ++target.at(3);
+      const int civ = /*const*/target.at(3);
+      const int& cir = /*const*/target.at(3);
+      int& ir = target.at(3);
+      target.at(Tag1{});
+      target.weird_overload();
     }
 )");
 }
@@ -266,8 +292,8 @@ TEST(ConstReferenceDeclRefExprsTest, PtrVar) {
       /*const*/target->staticMethod();
       target->nonConstMethod();
       (*/*const*/target)(ConstTag{});
-      (*target)[42];
-      target->operator[](42);
+      (*/*const*/target)[42];
+      /*const*/target->operator[](42);
       useConstRef((*/*const*/target));
       (/*const*/target)->constMethod();
       (void)(*/*const*/target == */*const*/target);
@@ -284,7 +310,15 @@ TEST(ConstReferenceDeclRefExprsTest, PtrVar) {
 
       const S& const_target_ref = */*const*/target;
       const S* const_target_ptr = /*const*/target;
-      S* target_ptr = target;  // FIXME: we could chect const usage of `target_ptr`.
+      S* target_ptr = target;  // FIXME: we could chect const usage of `target_ptr`
+
+      (void)/*const*/target->at(3);
+      ++target->at(3);
+      const int civ = /*const*/target->at(3);
+      const int& cir = /*const*/target->at(3);
+      int& ir = target->at(3);
+      target->at(Tag1{});
+      target->weird_overload();
     }
 )");
 }
@@ -319,6 +353,10 @@ TEST(ConstReferenceDeclRefExprsTest, ConstPtrVar) {
 
       const S& const_target_ref = */*const*/target;
       const S* const_target_ptr = /*const*/target;
+
+      (void)/*const*/target->at(3);
+      const int civ = /*const*/target->at(3);
+      const int& cir = /*const*/target->at(3);
     }
 )");
 }

diff --git a/clang/CMakeLists.txt b/clang/CMakeLists.txt
@@ -350,7 +350,9 @@ if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pedantic -Wno-long-long")
   endif ()
 
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-nested-anon-types" )
+  if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-nested-anon-types" )
+  endif ()
 endif ()
 
 # Determine HOST_LINK_VERSION on Darwin.
@@ -848,23 +850,17 @@ if (CLANG_ENABLE_BOOTSTRAP)
     set(CLANG_BOOTSTRAP_TARGETS check-llvm check-clang check-all)
   endif()
   foreach(target ${CLANG_BOOTSTRAP_TARGETS})
-    # Install targets have side effects, so we always want to execute them.
-    # "install" is reserved by CMake and can't be used as a step name for
-    # ExternalProject_Add_Step, so we can match against "^install-" instead of
-    # "^install" to get a tighter match. CMake's installation scripts already
-    # skip up-to-date files, so there's no behavior change if you install to the
-    # same destination multiple times.
-    if(target MATCHES "^install-")
-      set(step_always ON)
-    else()
-      set(step_always OFF)
-    endif()
 
     ExternalProject_Add_Step(${NEXT_CLANG_STAGE} ${target}
       COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --target ${target}
       COMMENT "Performing ${target} for '${NEXT_CLANG_STAGE}'"
       DEPENDEES configure
-      ALWAYS ${step_always}
+      # We need to set ALWAYS to ON here, otherwise these targets won't be
+      # built on a second invocation of ninja.  The targets have their own
+      # logic to determine if they should build or not so setting ALWAYS ON
+      # here does not mean the targets will always rebuild it just means that
+      # they will check their dependenices and see if they need to be built.
+      ALWAYS ON
       EXCLUDE_FROM_MAIN ON
       USES_TERMINAL 1
     )

diff --git a/clang/cmake/caches/CrossWinToARMLinux.cmake b/clang/cmake/caches/CrossWinToARMLinux.cmake
@@ -6,21 +6,23 @@
 # on Windows platform.
 #
 # NOTE: the build requires a development ARM Linux root filesystem to use
-# proper target platform depended library and header files:
-#  - create <full-path-to-clang-configs> directory and put the clang configuration
-#    file named <TOOLCHAIN_TARGET_TRIPLE>.cfg into it.
-#  - add the `--sysroot=<path-to-develop-arm-linux-root-fs>` argument into
-#    this configuration file.
-#  - add other necessary target depended clang arguments there, 
-#    such as '-mcpu=cortex-a78' & etc.
+# proper target platform depended library and header files.
+#
+# The build generates a proper clang configuration file with stored
+# --sysroot argument for specified target triple. Also it is possible
+# to specify configuration path via CMake arguments, such as
+#   -DCLANG_CONFIG_FILE_USER_DIR=<full-path-to-clang-configs>
+# and/or
+#   -DCLANG_CONFIG_FILE_SYSTEM_DIR=<full-path-to-clang-configs>
 #
 # See more details here: https://clang.llvm.org/docs/UsersManual.html#configuration-files
 #
 # Configure:
 #  cmake -G Ninja ^
 #       -DTOOLCHAIN_TARGET_TRIPLE=aarch64-unknown-linux-gnu ^
+#       -DTOOLCHAIN_TARGET_SYSROOTFS=<path-to-develop-arm-linux-root-fs> ^
+#       -DTOOLCHAIN_SHARED_LIBS=OFF ^ 
 #       -DCMAKE_INSTALL_PREFIX=../install ^
-#       -DCLANG_CONFIG_FILE_USER_DIR=<full-path-to-clang-configs> ^
 #       -DCMAKE_CXX_FLAGS="-D__OPTIMIZE__" ^
 #       -DREMOTE_TEST_HOST="<hostname>" ^
 #       -DREMOTE_TEST_USER="<ssh_user_name>" ^
@@ -81,6 +83,20 @@ endif()
 
 message(STATUS "Toolchain target triple: ${TOOLCHAIN_TARGET_TRIPLE}")
 
+if (DEFINED TOOLCHAIN_TARGET_SYSROOTFS)
+  message(STATUS "Toolchain target sysroot: ${TOOLCHAIN_TARGET_SYSROOTFS}")
+  # Store the --sysroot argument for the compiler-rt test flags.
+  set(sysroot_flags --sysroot='${TOOLCHAIN_TARGET_SYSROOTFS}')
+  # Generate the clang configuration file for the specified target triple
+  # and store --sysroot in this file.
+  file(WRITE "${CMAKE_BINARY_DIR}/bin/${TOOLCHAIN_TARGET_TRIPLE}.cfg" ${sysroot_flags})
+endif()
+
+# Build the shared libraries for libc++/libc++abi/libunwind.
+if (NOT DEFINED TOOLCHAIN_SHARED_LIBS)
+  set(TOOLCHAIN_SHARED_LIBS OFF)
+endif()
+
 if (NOT DEFINED LLVM_TARGETS_TO_BUILD)
   if ("${TOOLCHAIN_TARGET_TRIPLE}" MATCHES "^(armv|arm32)+")
     set(LLVM_TARGETS_TO_BUILD "ARM" CACHE STRING "")
@@ -183,20 +199,21 @@ set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_COMPILER_RT_CAN_EXECUTE_TESTS
 
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_COMPILER_RT_USE_BUILTINS_LIBRARY          ON CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_COMPILER_RT_CXX_LIBRARY                   libcxx CACHE STRING "")
-# Tell Clang to seach C++ headers alongside with the just-built binaries for the C++ compiler-rt tests.
-set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_COMPILER_RT_TEST_COMPILER_CFLAGS          "--stdlib=libc++" CACHE STRING "")
-
+# The compiler-rt tests disable the clang configuration files during the execution by setting CLANG_NO_DEFAULT_CONFIG=1
+# and drops out the --sysroot from there. Provide it explicity via the test flags here if target sysroot has been specified.
+set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_COMPILER_RT_TEST_COMPILER_CFLAGS          "--stdlib=libc++ ${sysroot_flags}" CACHE STRING "")
+
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBUNWIND_USE_COMPILER_RT                 ON CACHE BOOL "")
-set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBUNWIND_ENABLE_SHARED                   OFF CACHE BOOL "")
+set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBUNWIND_ENABLE_SHARED                   ${TOOLCHAIN_SHARED_LIBS} CACHE BOOL "")
 
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_USE_LLVM_UNWINDER               ON CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_STATIC_UNWINDER          ON CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_USE_COMPILER_RT                 ON CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS   OFF CACHE BOOL "")
-set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_SHARED                   OFF CACHE BOOL "")
+set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXXABI_ENABLE_SHARED                   ${TOOLCHAIN_SHARED_LIBS} CACHE BOOL "")
 
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_USE_COMPILER_RT                    ON CACHE BOOL "")
-set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ENABLE_SHARED                      OFF CACHE BOOL "")
+set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ENABLE_SHARED                      ${TOOLCHAIN_SHARED_LIBS} CACHE BOOL "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ABI_VERSION                        ${LIBCXX_ABI_VERSION} CACHE STRING "")
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_CXX_ABI                            "libcxxabi" CACHE STRING "")    #!!!
 set(RUNTIMES_${TOOLCHAIN_TARGET_TRIPLE}_LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS      ON CACHE BOOL "")

diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
@@ -30,7 +30,7 @@ endfunction()
 #
 # cmake -D LLVM_RELEASE_ENABLE_PGO=ON -C Release.cmake
 set(LLVM_RELEASE_ENABLE_LTO THIN CACHE STRING "")
-set(LLVM_RELEASE_ENABLE_PGO OFF CACHE BOOL "")
+set(LLVM_RELEASE_ENABLE_PGO ON CACHE BOOL "")
 set(LLVM_RELEASE_ENABLE_RUNTIMES "compiler-rt;libcxx;libcxxabi;libunwind" CACHE STRING "")
 set(LLVM_RELEASE_ENABLE_PROJECTS "clang;lld;lldb;clang-tools-extra;bolt;polly;mlir;flang" CACHE STRING "")
 # Note we don't need to add install here, since it is one of the pre-defined
@@ -91,4 +91,6 @@ endif()
 # Final Stage Config (stage2)
 set_final_stage_var(LLVM_ENABLE_RUNTIMES "${LLVM_RELEASE_ENABLE_RUNTIMES}" STRING)
 set_final_stage_var(LLVM_ENABLE_PROJECTS "${LLVM_RELEASE_ENABLE_PROJECTS}" STRING)
+set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
+set_final_stage_var(CPACK_ARCHIVE_THREADS "0" STRING)
 
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
@@ -4016,6 +4016,30 @@ Note that the `size` argument must be a compile time constant.
 
 Note that this intrinsic cannot yet be called in a ``constexpr`` context.
 
+``__is_bitwise_cloneable``
+--------------------------
+
+A type trait is used to check whether a type can be safely copied by memcpy.
+
+**Syntax**:
+
+.. code-block:: c++
+
+  bool __is_bitwise_cloneable(Type)
+
+**Description**:
+
+Objects of bitwise cloneable types can be bitwise copied by memcpy/memmove. The
+Clang compiler warrants that this behavior is well defined, and won't be
+broken by compiler optimizations and sanitizers.
+
+For implicit-lifetime types, the lifetime of the new object is implicitly
+started after the copy. For other types (e.g., classes with virtual methods),
+the lifetime isn't started, and using the object results in undefined behavior
+according to the C++ Standard.
+
+This builtin can be used in constant expressions.
+
 Atomic Min/Max builtins with memory ordering
 --------------------------------------------
 

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
@@ -214,6 +214,9 @@ C++23 Feature Support
 - Added a ``__reference_converts_from_temporary`` builtin, completing the necessary compiler support for
   `P2255R2: Type trait to determine if a reference binds to a temporary <https://wg21.link/P2255R2>`_.
 
+- Implemented `P2797R0: Static and explicit object member functions with the same parameter-type-lists <https://wg21.link/P2797R0>`_.
+  This completes the support for "deducing this".
+
 C++2c Feature Support
 ^^^^^^^^^^^^^^^^^^^^^
 
@@ -337,6 +340,9 @@ Non-comprehensive list of changes in this release
   ``-Winvalid-constexpr`` is not enabled for the function definition, which
   should result in mild compile-time performance improvements.
 
+- Added ``__is_bitwise_cloneable`` which is used to check whether a type
+  can be safely copied by memcpy/memmove.
+
 New Compiler Flags
 ------------------
 - ``-fsanitize=implicit-bitfield-conversion`` checks implicit truncation and
@@ -901,6 +907,7 @@ Arm and AArch64 Support
     * Arm Cortex-A520AE (cortex-a520ae).
     * Arm Cortex-A720AE (cortex-a720ae).
     * Arm Cortex-R82AE (cortex-r82ae).
+    * Arm Cortex-R52+ (cortex-r52plus).
     * Arm Neoverse-N3 (neoverse-n3).
     * Arm Neoverse-V3 (neoverse-v3).
     * Arm Neoverse-V3AE (neoverse-v3ae).
@@ -951,7 +958,7 @@ CUDA/HIP Language Changes
 
 CUDA Support
 ^^^^^^^^^^^^
-- Clang now supports CUDA SDK up to 12.4
+- Clang now supports CUDA SDK up to 12.5
 
 AIX Support
 ^^^^^^^^^^^

diff --git a/clang/docs/analyzer/checkers.rst b/clang/docs/analyzer/checkers.rst
@@ -599,7 +599,7 @@ Warns when a nullable pointer is returned from a function that has _Nonnull retu
 optin
 ^^^^^
 
-Checkers for portability, performance or coding style specific rules.
+Checkers for portability, performance, optional security and coding style specific rules.
 
 .. _optin-core-EnumCastOutOfRange:
 
@@ -938,6 +938,53 @@ optin.portability.UnixAPI
 """""""""""""""""""""""""
 Finds implementation-defined behavior in UNIX/Posix functions.
 
+.. _optin-taint-TaintedAlloc:
+
+optin.taint.TaintedAlloc (C, C++)
+"""""""""""""""""""""""""""""""""
+
+This checker warns for cases when the ``size`` parameter of the ``malloc`` ,
+``calloc``, ``realloc``, ``alloca`` or the size parameter of the
+array new C++ operator is tainted (potentially attacker controlled).
+If an attacker can inject a large value as the size parameter, memory exhaustion
+denial of service attack can be carried out.
+
+The ``alpha.security.taint.TaintPropagation`` checker also needs to be enabled for
+this checker to give warnings.
+
+The analyzer emits warning only if it cannot prove that the size parameter is
+within reasonable bounds (``<= SIZE_MAX/4``). This functionality partially
+covers the SEI Cert coding standard rule `INT04-C
+<https://wiki.sei.cmu.edu/confluence/display/c/INT04-C.+Enforce+limits+on+integer+values+originating+from+tainted+sources>`_.
+
+You can silence this warning either by bound checking the ``size`` parameter, or
+by explicitly marking the ``size`` parameter as sanitized. See the
+:ref:`alpha-security-taint-TaintPropagation` checker for more details.
+
+.. code-block:: c
+
+  void vulnerable(void) {
+    size_t size = 0;
+    scanf("%zu", &size);
+    int *p = malloc(size); // warn: malloc is called with a tainted (potentially attacker controlled) value
+    free(p);
+  }
+
+  void not_vulnerable(void) {
+    size_t size = 0;
+    scanf("%zu", &size);
+    if (1024 < size)
+      return;
+    int *p = malloc(size); // No warning expected as the the user input is bound
+    free(p);
+  }
+
+  void vulnerable_cpp(void) {
+    size_t size = 0;
+    scanf("%zu", &size);
+    int *ptr = new int[size];// warn: Memory allocation function is called with a tainted (potentially attacker controlled) value
+    delete[] ptr;
+  }
 
 .. _security-checkers:
 

diff --git a/clang/docs/tools/clang-formatted-files.txt b/clang/docs/tools/clang-formatted-files.txt
@@ -622,6 +622,7 @@ clang/tools/libclang/CXCursor.h
 clang/tools/scan-build-py/tests/functional/src/include/clean-one.h
 clang/unittests/Analysis/CFGBuildResult.h
 clang/unittests/Analysis/MacroExpansionContextTest.cpp
+clang/unittests/Analysis/FlowSensitive/ASTOpsTest.cpp
 clang/unittests/Analysis/FlowSensitive/CNFFormula.cpp
 clang/unittests/Analysis/FlowSensitive/DataflowAnalysisContextTest.cpp
 clang/unittests/Analysis/FlowSensitive/DataflowEnvironmentTest.cpp

diff --git a/clang/examples/PrintFunctionNames/PrintFunctionNames.cpp b/clang/examples/PrintFunctionNames/PrintFunctionNames.cpp
@@ -72,7 +72,7 @@ class PrintFunctionsConsumer : public ASTConsumer {
           *sema.LateParsedTemplateMap.find(FD)->second;
       sema.LateTemplateParser(sema.OpaqueParser, LPT);
       llvm::errs() << "late-parsed-decl: \"" << FD->getNameAsString() << "\"\n";
-    }   
+    }
   }
 };
 

diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
@@ -2150,7 +2150,11 @@ enum CXCursorKind {
    */
   CXCursor_OpenACCComputeConstruct = 320,
 
-  CXCursor_LastStmt = CXCursor_OpenACCComputeConstruct,
+  /** OpenACC Loop Construct.
+   */
+  CXCursor_OpenACCLoopConstruct = 321,
+
+  CXCursor_LastStmt = CXCursor_OpenACCLoopConstruct,
 
   /**
    * Cursor that represents the translation unit itself.

diff --git a/clang/include/clang/AST/ASTUnresolvedSet.h b/clang/include/clang/AST/ASTUnresolvedSet.h
@@ -16,6 +16,7 @@
 
 #include "clang/AST/ASTVector.h"
 #include "clang/AST/DeclAccessPair.h"
+#include "clang/AST/DeclID.h"
 #include "clang/AST/UnresolvedSet.h"
 #include "clang/Basic/Specifiers.h"
 #include <cassert>
@@ -56,6 +57,10 @@ class ASTUnresolvedSet {
     Decls.push_back(DeclAccessPair::make(D, AS), C);
   }
 
+  void addLazyDecl(ASTContext &C, GlobalDeclID ID, AccessSpecifier AS) {
+    Decls.push_back(DeclAccessPair::makeLazy(ID.get(), AS), C);
+  }
+
   /// Replaces the given declaration with the new one, once.
   ///
   /// \return true if the set changed
@@ -109,10 +114,10 @@ class LazyASTUnresolvedSet {
 
   void reserve(ASTContext &C, unsigned N) { Impl.reserve(C, N); }
 
-  void addLazyDecl(ASTContext &C, uintptr_t ID, AccessSpecifier AS) {
+  void addLazyDecl(ASTContext &C, GlobalDeclID ID, AccessSpecifier AS) {
     assert(Impl.empty() || Impl.Decls.isLazy());
     Impl.Decls.setLazy(true);
-    Impl.addDecl(C, reinterpret_cast<NamedDecl *>(ID << 2), AS);
+    Impl.addLazyDecl(C, ID, AS);
   }
 };
 

diff --git a/clang/include/clang/AST/CommentCommands.td b/clang/include/clang/AST/CommentCommands.td
@@ -132,9 +132,9 @@ def Tparam : BlockCommand<"tparam"> { let IsTParamCommand = 1; }
 // HeaderDoc command for template parameter documentation.
 def Templatefield : BlockCommand<"templatefield"> { let IsTParamCommand = 1; }
 
-def Throws    : BlockCommand<"throws"> { let IsThrowsCommand = 1; }
-def Throw     : BlockCommand<"throw"> { let IsThrowsCommand = 1; }
-def Exception : BlockCommand<"exception"> { let IsThrowsCommand = 1; }
+def Throws    : BlockCommand<"throws"> { let IsThrowsCommand = 1; let NumArgs = 1; }
+def Throw     : BlockCommand<"throw"> { let IsThrowsCommand = 1; let NumArgs = 1; }
+def Exception : BlockCommand<"exception"> { let IsThrowsCommand = 1; let NumArgs = 1;}
 
 def Deprecated : BlockCommand<"deprecated"> {
   let IsEmptyParagraphAllowed = 1;

diff --git a/clang/include/clang/AST/CommentParser.h b/clang/include/clang/AST/CommentParser.h
@@ -100,6 +100,11 @@ class Parser {
   ArrayRef<Comment::Argument>
   parseCommandArgs(TextTokenRetokenizer &Retokenizer, unsigned NumArgs);
 
+  /// Parse arguments for \throws command supported args are in form of class
+  /// or template.
+  ArrayRef<Comment::Argument>
+  parseThrowCommandArgs(TextTokenRetokenizer &Retokenizer, unsigned NumArgs);
+
   BlockCommandComment *parseBlockCommand();
   InlineCommandComment *parseInlineCommand();
 

diff --git a/clang/include/clang/AST/DeclAccessPair.h b/clang/include/clang/AST/DeclAccessPair.h
@@ -19,6 +19,7 @@
 
 #include "clang/Basic/Specifiers.h"
 #include "llvm/Support/DataTypes.h"
+#include "llvm/Support/Endian.h"
 
 namespace clang {
 
@@ -27,9 +28,17 @@ class NamedDecl;
 /// A POD class for pairing a NamedDecl* with an access specifier.
 /// Can be put into unions.
 class DeclAccessPair {
-  uintptr_t Ptr; // we'd use llvm::PointerUnion, but it isn't trivial
+  /// Use the lower 2 bit to store AccessSpecifier. Use the higher
+  /// 61 bit to store the pointer to a NamedDecl or the DeclID to
+  /// a NamedDecl. If the 3rd bit is set, storing the DeclID, otherwise
+  /// storing the pointer.
+  llvm::support::detail::packed_endian_specific_integral<
+      uint64_t, llvm::endianness::native, alignof(void *)>
+      Ptr;
 
-  enum { Mask = 0x3 };
+  enum { ASMask = 0x3, Mask = 0x7 };
+
+  bool isDeclID() const { return (Ptr >> 2) & 0x1; }
 
 public:
   static DeclAccessPair make(NamedDecl *D, AccessSpecifier AS) {
@@ -38,12 +47,22 @@ class DeclAccessPair {
     return p;
   }
 
+  static DeclAccessPair makeLazy(uint64_t ID, AccessSpecifier AS) {
+    DeclAccessPair p;
+    p.Ptr = (ID << 3) | (0x1 << 2) | uint64_t(AS);
+    return p;
+  }
+
+  uint64_t getDeclID() const {
+    assert(isDeclID());
+    return (~Mask & Ptr) >> 3;
+  }
+
   NamedDecl *getDecl() const {
+    assert(!isDeclID());
     return reinterpret_cast<NamedDecl*>(~Mask & Ptr);
   }
-  AccessSpecifier getAccess() const {
-    return AccessSpecifier(Mask & Ptr);
-  }
+  AccessSpecifier getAccess() const { return AccessSpecifier(ASMask & Ptr); }
 
   void setDecl(NamedDecl *D) {
     set(D, getAccess());
@@ -52,12 +71,18 @@ class DeclAccessPair {
     set(getDecl(), AS);
   }
   void set(NamedDecl *D, AccessSpecifier AS) {
-    Ptr = uintptr_t(AS) | reinterpret_cast<uintptr_t>(D);
+    Ptr = uint64_t(AS) | reinterpret_cast<uint64_t>(D);
   }
 
   operator NamedDecl*() const { return getDecl(); }
   NamedDecl *operator->() const { return getDecl(); }
 };
+
+// Make sure DeclAccessPair is pointer-aligned types.
+static_assert(alignof(DeclAccessPair) == alignof(void *));
+// Make sure DeclAccessPair is still POD.
+static_assert(std::is_standard_layout_v<DeclAccessPair> &&
+              std::is_trivial_v<DeclAccessPair>);
 }
 
 #endif
diff --git a/clang/include/clang/AST/DeclBase.h b/clang/include/clang/AST/DeclBase.h
@@ -708,10 +708,7 @@ class alignas(8) Decl {
 
   /// Set the owning module ID.  This may only be called for
   /// deserialized Decls.
-  void setOwningModuleID(unsigned ID) {
-    assert(isFromASTFile() && "Only works on a deserialized declaration");
-    *((unsigned*)this - 2) = ID;
-  }
+  void setOwningModuleID(unsigned ID);
 
 public:
   /// Determine the availability of the given declaration.
@@ -784,19 +781,11 @@ class alignas(8) Decl {
 
   /// Retrieve the global declaration ID associated with this
   /// declaration, which specifies where this Decl was loaded from.
-  GlobalDeclID getGlobalID() const {
-    if (isFromASTFile())
-      return (*((const GlobalDeclID *)this - 1));
-    return GlobalDeclID();
-  }
+  GlobalDeclID getGlobalID() const;
 
   /// Retrieve the global ID of the module that owns this particular
   /// declaration.
-  unsigned getOwningModuleID() const {
-    if (isFromASTFile())
-      return *((const unsigned*)this - 2);
-    return 0;
-  }
+  unsigned getOwningModuleID() const;
 
 private:
   Module *getOwningModuleSlow() const;

diff --git a/clang/include/clang/AST/DeclID.h b/clang/include/clang/AST/DeclID.h
@@ -19,6 +19,8 @@
 #include "llvm/ADT/DenseMapInfo.h"
 #include "llvm/ADT/iterator.h"
 
+#include <climits>
+
 namespace clang {
 
 /// Predefined declaration IDs.
@@ -107,12 +109,16 @@ class DeclIDBase {
   ///
   /// DeclID should only be used directly in serialization. All other users
   /// should use LocalDeclID or GlobalDeclID.
-  using DeclID = uint32_t;
+  using DeclID = uint64_t;
 
 protected:
   DeclIDBase() : ID(PREDEF_DECL_NULL_ID) {}
   explicit DeclIDBase(DeclID ID) : ID(ID) {}
 
+  explicit DeclIDBase(unsigned LocalID, unsigned ModuleFileIndex) {
+    ID = (DeclID)LocalID | ((DeclID)ModuleFileIndex << 32);
+  }
+
 public:
   DeclID get() const { return ID; }
 
@@ -124,6 +130,10 @@ class DeclIDBase {
 
   bool isInvalid() const { return ID == PREDEF_DECL_NULL_ID; }
 
+  unsigned getModuleFileIndex() const { return ID >> 32; }
+
+  unsigned getLocalDeclIndex() const;
+
   friend bool operator==(const DeclIDBase &LHS, const DeclIDBase &RHS) {
     return LHS.ID == RHS.ID;
   }
@@ -156,6 +166,9 @@ class LocalDeclID : public DeclIDBase {
   LocalDeclID(PredefinedDeclIDs ID) : Base(ID) {}
   explicit LocalDeclID(DeclID ID) : Base(ID) {}
 
+  explicit LocalDeclID(unsigned LocalID, unsigned ModuleFileIndex)
+      : Base(LocalID, ModuleFileIndex) {}
+
   LocalDeclID &operator++() {
     ++ID;
     return *this;
@@ -175,6 +188,9 @@ class GlobalDeclID : public DeclIDBase {
   GlobalDeclID() : Base() {}
   explicit GlobalDeclID(DeclID ID) : Base(ID) {}
 
+  explicit GlobalDeclID(unsigned LocalID, unsigned ModuleFileIndex)
+      : Base(LocalID, ModuleFileIndex) {}
+
   // For DeclIDIterator<GlobalDeclID> to be able to convert a GlobalDeclID
   // to a LocalDeclID.
   explicit operator LocalDeclID() const { return LocalDeclID(this->ID); }

diff --git a/clang/include/clang/AST/ExprCXX.h b/clang/include/clang/AST/ExprCXX.h
@@ -3025,9 +3025,10 @@ class OverloadExpr : public Expr {
 
 public:
   struct FindResult {
-    OverloadExpr *Expression;
-    bool IsAddressOfOperand;
-    bool HasFormOfMemberPointer;
+    OverloadExpr *Expression = nullptr;
+    bool IsAddressOfOperand = false;
+    bool IsAddressOfOperandWithParen = false;
+    bool HasFormOfMemberPointer = false;
   };
 
   /// Finds the overloaded expression in the given expression \p E of
@@ -3039,6 +3040,7 @@ class OverloadExpr : public Expr {
     assert(E->getType()->isSpecificBuiltinType(BuiltinType::Overload));
 
     FindResult Result;
+    bool HasParen = isa<ParenExpr>(E);
 
     E = E->IgnoreParens();
     if (isa<UnaryOperator>(E)) {
@@ -3048,10 +3050,9 @@ class OverloadExpr : public Expr {
 
       Result.HasFormOfMemberPointer = (E == Ovl && Ovl->getQualifier());
       Result.IsAddressOfOperand = true;
+      Result.IsAddressOfOperandWithParen = HasParen;
       Result.Expression = Ovl;
     } else {
-      Result.HasFormOfMemberPointer = false;
-      Result.IsAddressOfOperand = false;
       Result.Expression = cast<OverloadExpr>(E);
     }
 

diff --git a/clang/include/clang/AST/OpenACCClause.h b/clang/include/clang/AST/OpenACCClause.h
@@ -54,6 +54,149 @@ class OpenACCClause {
   virtual ~OpenACCClause() = default;
 };
 
+// Represents the 'auto' clause.
+class OpenACCAutoClause : public OpenACCClause {
+protected:
+  OpenACCAutoClause(SourceLocation BeginLoc, SourceLocation EndLoc)
+      : OpenACCClause(OpenACCClauseKind::Auto, BeginLoc, EndLoc) {}
+
+public:
+  static bool classof(const OpenACCClause *C) {
+    return C->getClauseKind() == OpenACCClauseKind::Auto;
+  }
+
+  static OpenACCAutoClause *
+  Create(const ASTContext &Ctx, SourceLocation BeginLoc, SourceLocation EndLoc);
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+
+// Represents the 'independent' clause.
+class OpenACCIndependentClause : public OpenACCClause {
+protected:
+  OpenACCIndependentClause(SourceLocation BeginLoc, SourceLocation EndLoc)
+      : OpenACCClause(OpenACCClauseKind::Independent, BeginLoc, EndLoc) {}
+
+public:
+  static bool classof(const OpenACCClause *C) {
+    return C->getClauseKind() == OpenACCClauseKind::Independent;
+  }
+
+  static OpenACCIndependentClause *
+  Create(const ASTContext &Ctx, SourceLocation BeginLoc, SourceLocation EndLoc);
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+// Represents the 'seq' clause.
+class OpenACCSeqClause : public OpenACCClause {
+protected:
+  OpenACCSeqClause(SourceLocation BeginLoc, SourceLocation EndLoc)
+      : OpenACCClause(OpenACCClauseKind::Seq, BeginLoc, EndLoc) {}
+
+public:
+  static bool classof(const OpenACCClause *C) {
+    return C->getClauseKind() == OpenACCClauseKind::Seq;
+  }
+
+  static OpenACCSeqClause *
+  Create(const ASTContext &Ctx, SourceLocation BeginLoc, SourceLocation EndLoc);
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+
+// Not yet implemented, but the type name is necessary for 'seq' diagnostics, so
+// this provides a basic, do-nothing implementation. We still need to add this
+// type to the visitors/etc, as well as get it to take its proper arguments.
+class OpenACCGangClause : public OpenACCClause {
+protected:
+  OpenACCGangClause(SourceLocation BeginLoc, SourceLocation EndLoc)
+      : OpenACCClause(OpenACCClauseKind::Gang, BeginLoc, EndLoc) {
+    llvm_unreachable("Not yet implemented");
+  }
+
+public:
+  static bool classof(const OpenACCClause *C) {
+    return C->getClauseKind() == OpenACCClauseKind::Gang;
+  }
+
+  static OpenACCGangClause *
+  Create(const ASTContext &Ctx, SourceLocation BeginLoc, SourceLocation EndLoc);
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+
+// Not yet implemented, but the type name is necessary for 'seq' diagnostics, so
+// this provides a basic, do-nothing implementation. We still need to add this
+// type to the visitors/etc, as well as get it to take its proper arguments.
+class OpenACCVectorClause : public OpenACCClause {
+protected:
+  OpenACCVectorClause(SourceLocation BeginLoc, SourceLocation EndLoc)
+      : OpenACCClause(OpenACCClauseKind::Vector, BeginLoc, EndLoc) {
+    llvm_unreachable("Not yet implemented");
+  }
+
+public:
+  static bool classof(const OpenACCClause *C) {
+    return C->getClauseKind() == OpenACCClauseKind::Gang;
+  }
+
+  static OpenACCVectorClause *
+  Create(const ASTContext &Ctx, SourceLocation BeginLoc, SourceLocation EndLoc);
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+
+// Not yet implemented, but the type name is necessary for 'seq' diagnostics, so
+// this provides a basic, do-nothing implementation. We still need to add this
+// type to the visitors/etc, as well as get it to take its proper arguments.
+class OpenACCWorkerClause : public OpenACCClause {
+protected:
+  OpenACCWorkerClause(SourceLocation BeginLoc, SourceLocation EndLoc)
+      : OpenACCClause(OpenACCClauseKind::Gang, BeginLoc, EndLoc) {
+    llvm_unreachable("Not yet implemented");
+  }
+
+public:
+  static bool classof(const OpenACCClause *C) {
+    return C->getClauseKind() == OpenACCClauseKind::Gang;
+  }
+
+  static OpenACCWorkerClause *
+  Create(const ASTContext &Ctx, SourceLocation BeginLoc, SourceLocation EndLoc);
+
+  child_range children() {
+    return child_range(child_iterator(), child_iterator());
+  }
+  const_child_range children() const {
+    return const_child_range(const_child_iterator(), const_child_iterator());
+  }
+};
+
 /// Represents a clause that has a list of parameters.
 class OpenACCClauseWithParams : public OpenACCClause {
   /// Location of the '('.
@@ -724,7 +867,7 @@ template <class Impl> class OpenACCClauseVisitor {
   case OpenACCClauseKind::CLAUSE_NAME:                                         \
     Visit##CLAUSE_NAME##Clause(*cast<OpenACC##CLAUSE_NAME##Clause>(C));        \
     return;
-#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME)                                  \
+#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME, DEPRECATED)                      \
   case OpenACCClauseKind::ALIAS_NAME:                                          \
     Visit##CLAUSE_NAME##Clause(*cast<OpenACC##CLAUSE_NAME##Clause>(C));        \
     return;

diff --git a/clang/include/clang/AST/RecursiveASTVisitor.h b/clang/include/clang/AST/RecursiveASTVisitor.h
@@ -4000,6 +4000,8 @@ bool RecursiveASTVisitor<Derived>::VisitOpenACCClauseList(
 
 DEF_TRAVERSE_STMT(OpenACCComputeConstruct,
                   { TRY_TO(TraverseOpenACCAssociatedStmtConstruct(S)); })
+DEF_TRAVERSE_STMT(OpenACCLoopConstruct,
+                  { TRY_TO(TraverseOpenACCAssociatedStmtConstruct(S)); })
 
 // FIXME: look at the following tricky-seeming exprs to see if we
 // need to recurse on anything.  These are ones that have methods

diff --git a/clang/include/clang/AST/StmtOpenACC.h b/clang/include/clang/AST/StmtOpenACC.h
@@ -113,6 +113,8 @@ class OpenACCAssociatedStmtConstruct : public OpenACCConstructStmt {
     return const_cast<OpenACCAssociatedStmtConstruct *>(this)->children();
   }
 };
+
+class OpenACCLoopConstruct;
 /// This class represents a compute construct, representing a 'Kind' of
 /// `parallel', 'serial', or 'kernel'. These constructs are associated with a
 /// 'structured block', defined as:
@@ -165,6 +167,11 @@ class OpenACCComputeConstruct final
   }
 
   void setStructuredBlock(Stmt *S) { setAssociatedStmt(S); }
+  // Serialization helper function that searches the structured block for 'loop'
+  // constructs that should be associated with this, and sets their parent
+  // compute construct to this one. This isn't necessary normally, since we have
+  // the ability to record the state during parsing.
+  void findAndSetChildLoops();
 
 public:
   static bool classof(const Stmt *T) {
@@ -176,12 +183,74 @@ class OpenACCComputeConstruct final
   static OpenACCComputeConstruct *
   Create(const ASTContext &C, OpenACCDirectiveKind K, SourceLocation BeginLoc,
          SourceLocation DirectiveLoc, SourceLocation EndLoc,
-         ArrayRef<const OpenACCClause *> Clauses, Stmt *StructuredBlock);
+         ArrayRef<const OpenACCClause *> Clauses, Stmt *StructuredBlock,
+         ArrayRef<OpenACCLoopConstruct *> AssociatedLoopConstructs);
 
   Stmt *getStructuredBlock() { return getAssociatedStmt(); }
   const Stmt *getStructuredBlock() const {
     return const_cast<OpenACCComputeConstruct *>(this)->getStructuredBlock();
   }
 };
+/// This class represents a 'loop' construct.  The 'loop' construct applies to a
+/// 'for' loop (or range-for loop), and is optionally associated with a Compute
+/// Construct.
+class OpenACCLoopConstruct final
+    : public OpenACCAssociatedStmtConstruct,
+      public llvm::TrailingObjects<OpenACCLoopConstruct,
+                                   const OpenACCClause *> {
+  // The compute construct this loop is associated with, or nullptr if this is
+  // an orphaned loop construct, or if it hasn't been set yet.  Because we
+  // construct the directives at the end of their statement, the 'parent'
+  // construct is not yet available at the time of construction, so this needs
+  // to be set 'later'.
+  const OpenACCComputeConstruct *ParentComputeConstruct = nullptr;
+
+  friend class ASTStmtWriter;
+  friend class ASTStmtReader;
+  friend class ASTContext;
+  friend class OpenACCComputeConstruct;
+
+  OpenACCLoopConstruct(unsigned NumClauses);
+
+  OpenACCLoopConstruct(SourceLocation Start, SourceLocation DirLoc,
+                       SourceLocation End,
+                       ArrayRef<const OpenACCClause *> Clauses, Stmt *Loop);
+  void setLoop(Stmt *Loop);
+
+  void setParentComputeConstruct(OpenACCComputeConstruct *CC) {
+    assert(!ParentComputeConstruct && "Parent already set?");
+    ParentComputeConstruct = CC;
+  }
+
+public:
+  static bool classof(const Stmt *T) {
+    return T->getStmtClass() == OpenACCLoopConstructClass;
+  }
+
+  static OpenACCLoopConstruct *CreateEmpty(const ASTContext &C,
+                                           unsigned NumClauses);
+
+  static OpenACCLoopConstruct *
+  Create(const ASTContext &C, SourceLocation BeginLoc, SourceLocation DirLoc,
+         SourceLocation EndLoc, ArrayRef<const OpenACCClause *> Clauses,
+         Stmt *Loop);
+
+  Stmt *getLoop() { return getAssociatedStmt(); }
+  const Stmt *getLoop() const {
+    return const_cast<OpenACCLoopConstruct *>(this)->getLoop();
+  }
+
+  /// OpenACC 3.3 2.9:
+  /// An orphaned loop construct is a loop construct that is not lexically
+  /// enclosed within a compute construct. The parent compute construct of a
+  /// loop construct is the nearest compute construct that lexically contains
+  /// the loop construct.
+  bool isOrphanedLoopConstruct() const {
+    return ParentComputeConstruct == nullptr;
+  }
+  const OpenACCComputeConstruct *getParentComputeConstruct() const {
+    return ParentComputeConstruct;
+  }
+};
 } // namespace clang
 #endif // LLVM_CLANG_AST_STMTOPENACC_H
diff --git a/clang/include/clang/AST/TemplateBase.h b/clang/include/clang/AST/TemplateBase.h
@@ -459,7 +459,7 @@ class TemplateArgument {
              bool IncludeType) const;
 
   /// Debugging aid that dumps the template argument.
-  void dump(raw_ostream &Out) const;
+  void dump(raw_ostream &Out, const ASTContext &Context) const;
 
   /// Debugging aid that dumps the template argument to standard error.
   void dump() const;

diff --git a/clang/include/clang/AST/TemplateName.h b/clang/include/clang/AST/TemplateName.h
@@ -340,7 +340,7 @@ class TemplateName {
              Qualified Qual = Qualified::AsWritten) const;
 
   /// Debugging aid that dumps the template name.
-  void dump(raw_ostream &OS) const;
+  void dump(raw_ostream &OS, const ASTContext &Context) const;
 
   /// Debugging aid that dumps the template name to standard
   /// error.

diff --git a/clang/include/clang/AST/TextNodeDumper.h b/clang/include/clang/AST/TextNodeDumper.h
@@ -408,6 +408,7 @@ class TextNodeDumper
   VisitLifetimeExtendedTemporaryDecl(const LifetimeExtendedTemporaryDecl *D);
   void VisitHLSLBufferDecl(const HLSLBufferDecl *D);
   void VisitOpenACCConstructStmt(const OpenACCConstructStmt *S);
+  void VisitOpenACCLoopConstruct(const OpenACCLoopConstruct *S);
 };
 
 } // namespace clang

diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
@@ -1120,6 +1120,20 @@ class QualType {
   /// Return true if this is a trivially copyable type (C++0x [basic.types]p9)
   bool isTriviallyCopyableType(const ASTContext &Context) const;
 
+  /// Return true if the type is safe to bitwise copy using memcpy/memmove.
+  ///
+  /// This is an extension in clang: bitwise cloneable types act as trivially
+  /// copyable types, meaning their underlying bytes can be safely copied by
+  /// memcpy or memmove. After the copy, the destination object has the same
+  /// object representation.
+  ///
+  /// However, there are cases where it is not safe to copy:
+  ///  - When sanitizers, such as AddressSanitizer, add padding with poison,
+  ///    which can cause issues if those poisoned padding bits are accessed.
+  ///  - Types with Objective-C lifetimes, where specific runtime
+  ///    semantics may not be preserved during a bitwise copy.
+  bool isBitwiseCloneableType(const ASTContext &Context) const;
+
   /// Return true if this is a trivially copyable type
   bool isTriviallyCopyConstructibleType(const ASTContext &Context) const;
 

diff --git a/clang/include/clang/AST/UnresolvedSet.h b/clang/include/clang/AST/UnresolvedSet.h
@@ -47,6 +47,7 @@ class UnresolvedSetIterator : public llvm::iterator_adaptor_base<
   // temporaries with defaulted ctors are not zero initialized.
   UnresolvedSetIterator() : iterator_adaptor_base(nullptr) {}
 
+  uint64_t getDeclID() const { return I->getDeclID(); }
   NamedDecl *getDecl() const { return I->getDecl(); }
   void setDecl(NamedDecl *ND) const { return I->setDecl(ND); }
   AccessSpecifier getAccess() const { return I->getAccess(); }

diff --git a/clang/include/clang/Analysis/Analyses/ThreadSafetyCommon.h b/clang/include/clang/Analysis/Analyses/ThreadSafetyCommon.h
@@ -330,9 +330,9 @@ class CapabilityExpr {
 
   bool shouldIgnore() const { return sexpr() == nullptr; }
 
-  bool isInvalid() const { return sexpr() && isa<til::Undefined>(sexpr()); }
+  bool isInvalid() const { return isa_and_nonnull<til::Undefined>(sexpr()); }
 
-  bool isUniversal() const { return sexpr() && isa<til::Wildcard>(sexpr()); }
+  bool isUniversal() const { return isa_and_nonnull<til::Wildcard>(sexpr()); }
 };
 
 // Translate clang::Expr to til::SExpr.

diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
@@ -4470,37 +4470,20 @@ def HLSLShader : InheritableAttr {
   let Subjects = SubjectList<[HLSLEntry]>;
   let LangOpts = [HLSL];
   let Args = [
-    EnumArgument<"Type", "ShaderType", /*is_string=*/true,
+    EnumArgument<"Type", "llvm::Triple::EnvironmentType", /*is_string=*/true,
                  ["pixel", "vertex", "geometry", "hull", "domain", "compute",
                   "raygeneration", "intersection", "anyhit", "closesthit",
                   "miss", "callable", "mesh", "amplification"],
                  ["Pixel", "Vertex", "Geometry", "Hull", "Domain", "Compute",
                   "RayGeneration", "Intersection", "AnyHit", "ClosestHit",
-                  "Miss", "Callable", "Mesh", "Amplification"]>
+                  "Miss", "Callable", "Mesh", "Amplification"],
+                  /*opt=*/0, /*fake=*/0, /*isExternalType=*/1>
   ];
   let Documentation = [HLSLSV_ShaderTypeAttrDocs];
   let AdditionalMembers =
 [{
-  static const unsigned ShaderTypeMaxValue = (unsigned)HLSLShaderAttr::Amplification;
-
-  static llvm::Triple::EnvironmentType getTypeAsEnvironment(HLSLShaderAttr::ShaderType ShaderType) {
-    switch (ShaderType) {
-      case HLSLShaderAttr::Pixel:         return llvm::Triple::Pixel;
-      case HLSLShaderAttr::Vertex:        return llvm::Triple::Vertex;
-      case HLSLShaderAttr::Geometry:      return llvm::Triple::Geometry;
-      case HLSLShaderAttr::Hull:          return llvm::Triple::Hull;
-      case HLSLShaderAttr::Domain:        return llvm::Triple::Domain;
-      case HLSLShaderAttr::Compute:       return llvm::Triple::Compute;
-      case HLSLShaderAttr::RayGeneration: return llvm::Triple::RayGeneration;
-      case HLSLShaderAttr::Intersection:  return llvm::Triple::Intersection;
-      case HLSLShaderAttr::AnyHit:        return llvm::Triple::AnyHit;
-      case HLSLShaderAttr::ClosestHit:    return llvm::Triple::ClosestHit;
-      case HLSLShaderAttr::Miss:          return llvm::Triple::Miss;
-      case HLSLShaderAttr::Callable:      return llvm::Triple::Callable;
-      case HLSLShaderAttr::Mesh:          return llvm::Triple::Mesh;
-      case HLSLShaderAttr::Amplification: return llvm::Triple::Amplification;
-    }
-    llvm_unreachable("unknown enumeration value");
+  static bool isValidShaderType(llvm::Triple::EnvironmentType ShaderType) {
+    return ShaderType >= llvm::Triple::Pixel && ShaderType <= llvm::Triple::Amplification;
   }
 }];
 }

diff --git a/clang/include/clang/Basic/Builtins.td b/clang/include/clang/Basic/Builtins.td
@@ -482,11 +482,11 @@ def SqrtF16F128 : Builtin, F16F128MathTemplate {
   let Prototype = "T(T)";
 }
 
-def TanF128 : Builtin {
-  let Spellings = ["__builtin_tanf128"];
+def TanF16F128 : Builtin, F16F128MathTemplate {
+  let Spellings = ["__builtin_tan"];
   let Attributes = [FunctionWithBuiltinPrefix, NoThrow,
                     ConstIgnoringErrnoAndExceptions];
-  let Prototype = "__float128(__float128)";
+  let Prototype = "T(T)";
 }
 
 def TanhF128 : Builtin {

diff --git a/clang/include/clang/Basic/BuiltinsAMDGPU.def b/clang/include/clang/Basic/BuiltinsAMDGPU.def
@@ -240,7 +240,7 @@ TARGET_BUILTIN(__builtin_amdgcn_flat_atomic_fadd_v2bf16, "V2sV2s*0V2s", "t", "at
 TARGET_BUILTIN(__builtin_amdgcn_global_atomic_fadd_v2bf16, "V2sV2s*1V2s", "t", "atomic-global-pk-add-bf16-inst")
 TARGET_BUILTIN(__builtin_amdgcn_ds_atomic_fadd_v2bf16, "V2sV2s*3V2s", "t", "atomic-ds-pk-add-16-insts")
 TARGET_BUILTIN(__builtin_amdgcn_ds_atomic_fadd_v2f16, "V2hV2h*3V2h", "t", "atomic-ds-pk-add-16-insts")
-TARGET_BUILTIN(__builtin_amdgcn_global_load_lds, "vv*1v*3UiiUi", "t", "gfx940-insts")
+TARGET_BUILTIN(__builtin_amdgcn_global_load_lds, "vv*1v*3IUiIiIUi", "t", "gfx940-insts")
 
 //===----------------------------------------------------------------------===//
 // Deep learning builtins.

diff --git a/clang/include/clang/Basic/BuiltinsNVPTX.def b/clang/include/clang/Basic/BuiltinsNVPTX.def
@@ -62,7 +62,9 @@
 #pragma push_macro("PTX82")
 #pragma push_macro("PTX83")
 #pragma push_macro("PTX84")
-#define PTX84 "ptx84"
+#pragma push_macro("PTX85")
+#define PTX85 "ptx85"
+#define PTX84 "ptx84|" PTX85
 #define PTX83 "ptx83|" PTX84
 #define PTX82 "ptx82|" PTX83
 #define PTX81 "ptx81|" PTX82
@@ -1094,3 +1096,4 @@ TARGET_BUILTIN(__nvvm_getctarank_shared_cluster, "iv*3", "", AND(SM_90,PTX78))
 #pragma pop_macro("PTX82")
 #pragma pop_macro("PTX83")
 #pragma pop_macro("PTX84")
+#pragma pop_macro("PTX85")
diff --git a/clang/include/clang/Basic/CodeGenOptions.def b/clang/include/clang/Basic/CodeGenOptions.def
@@ -61,7 +61,7 @@ CODEGENOPT(SeparateNamedSections, 1, 0) ///< Set for -fseparate-named-sections.
 CODEGENOPT(EnableAIXExtendedAltivecABI, 1, 0) ///< Set for -mabi=vec-extabi. Enables the extended Altivec ABI on AIX.
 CODEGENOPT(XCOFFReadOnlyPointers, 1, 0) ///< Set for -mxcoff-roptr.
 CODEGENOPT(AllTocData, 1, 0) ///< AIX -mtocdata
-ENUM_CODEGENOPT(FramePointer, FramePointerKind, 2, FramePointerKind::None) /// frame-pointer: all,non-leaf,none
+ENUM_CODEGENOPT(FramePointer, FramePointerKind, 2, FramePointerKind::None) /// frame-pointer: all,non-leaf,reserved,none
 
 CODEGENOPT(ClearASTBeforeBackend , 1, 0) ///< Free the AST before running backend code generation. Only works with -disable-free.
 CODEGENOPT(DisableFree       , 1, 0) ///< Don't free memory.

diff --git a/clang/include/clang/Basic/CodeGenOptions.h b/clang/include/clang/Basic/CodeGenOptions.h
@@ -127,15 +127,18 @@ class CodeGenOptions : public CodeGenOptionsBase {
   std::string BinutilsVersion;
 
   enum class FramePointerKind {
-    None,        // Omit all frame pointers.
-    NonLeaf,     // Keep non-leaf frame pointers.
-    All,         // Keep all frame pointers.
+    None,     // Omit all frame pointers.
+    Reserved, // Maintain valid frame pointer chain.
+    NonLeaf,  // Keep non-leaf frame pointers.
+    All,      // Keep all frame pointers.
   };
 
   static StringRef getFramePointerKindName(FramePointerKind Kind) {
     switch (Kind) {
     case FramePointerKind::None:
       return "none";
+    case FramePointerKind::Reserved:
+      return "reserved";
     case FramePointerKind::NonLeaf:
       return "non-leaf";
     case FramePointerKind::All:

diff --git a/clang/include/clang/Basic/Cuda.h b/clang/include/clang/Basic/Cuda.h
@@ -42,9 +42,10 @@ enum class CudaVersion {
   CUDA_122,
   CUDA_123,
   CUDA_124,
+  CUDA_125,
   FULLY_SUPPORTED = CUDA_123,
   PARTIALLY_SUPPORTED =
-      CUDA_124, // Partially supported. Proceed with a warning.
+      CUDA_125, // Partially supported. Proceed with a warning.
   NEW = 10000,  // Too new. Issue a warning, but allow using it.
 };
 const char *CudaVersionToString(CudaVersion V);
@@ -91,6 +92,7 @@ enum class CudaArch {
   GFX803,
   GFX805,
   GFX810,
+  GFX9_GENERIC,
   GFX900,
   GFX902,
   GFX904,
@@ -102,23 +104,28 @@ enum class CudaArch {
   GFX940,
   GFX941,
   GFX942,
+  GFX10_1_GENERIC,
   GFX1010,
   GFX1011,
   GFX1012,
   GFX1013,
+  GFX10_3_GENERIC,
   GFX1030,
   GFX1031,
   GFX1032,
   GFX1033,
   GFX1034,
   GFX1035,
   GFX1036,
+  GFX11_GENERIC,
   GFX1100,
   GFX1101,
   GFX1102,
   GFX1103,
   GFX1150,
   GFX1151,
+  GFX1152,
+  GFX12_GENERIC,
   GFX1200,
   GFX1201,
   Generic, // A processor model named 'generic' if the target backend defines a

diff --git a/clang/include/clang/Basic/DiagnosticOptions.h b/clang/include/clang/Basic/DiagnosticOptions.h
@@ -124,7 +124,7 @@ class DiagnosticOptions : public RefCountedBase<DiagnosticOptions>{
   /// default).
   std::vector<std::string> VerifyPrefixes;
 
-  /// The list of -Wsystem-header-in-module=... options used to override
+  /// The list of -Wsystem-headers-in-module=... options used to override
   /// whether -Wsystem-headers is enabled on a per-module basis.
   std::vector<std::string> SystemHeaderWarningsModules;
 

diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -607,6 +607,8 @@ def note_using_decl_class_member_workaround : Note<
   "a const variable|a constexpr variable}0 instead">;
 def err_using_decl_can_not_refer_to_namespace : Error<
   "using declaration cannot refer to a namespace">;
+def note_namespace_using_decl : Note<
+  "did you mean 'using namespace'?">;
 def warn_cxx17_compat_using_decl_scoped_enumerator: Warning<
   "using declaration naming a scoped enumerator is incompatible with "
   "C++ standards before C++20">, InGroup<CXXPre20Compat>, DefaultIgnore;
@@ -6088,9 +6090,9 @@ def err_redefinition_different_concept : Error<
   "redefinition of concept %0 with different template parameters or requirements">;
 def err_tag_reference_non_tag : Error<
   "%select{non-struct type|non-class type|non-union type|non-enum "
-  "type|typedef|type alias|template|type alias template|template "
-  "template argument}1 %0 cannot be referenced with a "
-  "%select{struct|interface|union|class|enum}2 specifier">;
+  "type|typedef|type alias|template|alias template|template "
+  "template argument}1 %0 cannot be referenced with the '"
+  "%select{struct|interface|union|class|enum}2' specifier">;
 def err_tag_reference_conflict : Error<
   "implicit declaration introduced by elaborated type conflicts with a "
   "%select{non-struct type|non-class type|non-union type|non-enum "
@@ -9013,6 +9015,11 @@ def err_cuda_ovl_target : Error<
   "cannot overload %select{__device__|__global__|__host__|__host__ __device__}2 function %3">;
 def note_cuda_ovl_candidate_target_mismatch : Note<
     "candidate template ignored: target attributes do not match">;
+def warn_offload_incompatible_redeclare : Warning<
+  "target-attribute based function overloads are not supported by NVCC and will be treated as a function redeclaration:"
+  "new declaration is %select{__device__|__global__|__host__|__host__ __device__}0 function, "
+  "old declaration is %select{__device__|__global__|__host__|__host__ __device__}1 function">,
+  InGroup<DiagGroup<"nvcc-compat">>, DefaultIgnore;
 
 def err_cuda_device_builtin_surftex_cls_template : Error<
     "illegal device builtin %select{surface|texture}0 reference "
@@ -10082,6 +10089,12 @@ def warn_new_dangling_initializer_list : Warning<
   "the allocated initializer list}0 "
   "will be destroyed at the end of the full-expression">,
   InGroup<DanglingInitializerList>;
+def warn_unsupported_lifetime_extension : Warning<
+  "lifetime extension of "
+  "%select{temporary|backing array of initializer list}0 created "
+  "by aggregate initialization using a default member initializer "
+  "is not yet supported; lifetime of %select{temporary|backing array}0 "
+  "will end at the end of the full-expression">, InGroup<Dangling>;
 
 // For non-floating point, expressions of the form x == x or x != x
 // should result in a warning, since these always evaluate to a constant.
@@ -12398,7 +12411,10 @@ def err_acc_var_not_pointer_type
 def note_acc_expected_pointer_var : Note<"expected variable of pointer type">;
 def err_acc_clause_after_device_type
     : Error<"OpenACC clause '%0' may not follow a '%1' clause in a "
-            "compute construct">;
+            "%select{'%3'|compute}2 construct">;
+def err_acc_clause_cannot_combine
+    : Error<"OpenACC clause '%0' may not appear on the same construct as a "
+            "'%1' clause on a 'loop' construct">;
 def err_acc_reduction_num_gangs_conflict
     : Error<
           "OpenACC 'reduction' clause may not appear on a 'parallel' construct "
@@ -12413,6 +12429,12 @@ def err_acc_reduction_composite_type
 def err_acc_reduction_composite_member_type :Error<
     "OpenACC 'reduction' composite variable must not have non-scalar field">;
 def note_acc_reduction_composite_member_loc : Note<"invalid field is here">;
+def err_acc_loop_not_for_loop
+    : Error<"OpenACC 'loop' construct can only be applied to a 'for' loop">;
+def note_acc_construct_here : Note<"'%0' construct is here">;
+def err_acc_loop_spec_conflict
+    : Error<"OpenACC clause '%0' on '%1' construct conflicts with previous "
+            "data dependence clause">;
 
 // AMDGCN builtins diagnostics
 def err_amdgcn_global_load_lds_size_invalid_value : Error<"invalid size value">;

diff --git a/clang/include/clang/Basic/Features.def b/clang/include/clang/Basic/Features.def
@@ -96,6 +96,7 @@ FEATURE(nullability, true)
 FEATURE(nullability_on_arrays, true)
 FEATURE(nullability_on_classes, true)
 FEATURE(nullability_nullable_result, true)
+FEATURE(numerical_stability_sanitizer, LangOpts.Sanitize.has(SanitizerKind::NumericalStability))
 FEATURE(memory_sanitizer,
         LangOpts.Sanitize.hasOneOf(SanitizerKind::Memory |
                                    SanitizerKind::KernelMemory))

diff --git a/clang/include/clang/Basic/OpenACCClauses.def b/clang/include/clang/Basic/OpenACCClauses.def
@@ -15,39 +15,42 @@
 //
 // VISIT_CLAUSE(CLAUSE_NAME)
 //
-// CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME)
+// CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME, DEPRECATED)
 
 #ifndef CLAUSE_ALIAS
-#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME)
+#define CLAUSE_ALIAS(ALIAS_NAME, CLAUSE_NAME, false)
 #endif
 
+VISIT_CLAUSE(Auto)
 VISIT_CLAUSE(Async)
 VISIT_CLAUSE(Attach)
 VISIT_CLAUSE(Copy)
-CLAUSE_ALIAS(PCopy, Copy)
-CLAUSE_ALIAS(PresentOrCopy, Copy)
+CLAUSE_ALIAS(PCopy, Copy, true)
+CLAUSE_ALIAS(PresentOrCopy, Copy, true)
 VISIT_CLAUSE(CopyIn)
-CLAUSE_ALIAS(PCopyIn, CopyIn)
-CLAUSE_ALIAS(PresentOrCopyIn, CopyIn)
+CLAUSE_ALIAS(PCopyIn, CopyIn, true)
+CLAUSE_ALIAS(PresentOrCopyIn, CopyIn, true)
 VISIT_CLAUSE(CopyOut)
-CLAUSE_ALIAS(PCopyOut, CopyOut)
-CLAUSE_ALIAS(PresentOrCopyOut, CopyOut)
+CLAUSE_ALIAS(PCopyOut, CopyOut, true)
+CLAUSE_ALIAS(PresentOrCopyOut, CopyOut, true)
 VISIT_CLAUSE(Create)
-CLAUSE_ALIAS(PCreate, Create)
-CLAUSE_ALIAS(PresentOrCreate, Create)
+CLAUSE_ALIAS(PCreate, Create, true)
+CLAUSE_ALIAS(PresentOrCreate, Create, true)
 VISIT_CLAUSE(Default)
 VISIT_CLAUSE(DevicePtr)
 VISIT_CLAUSE(DeviceType)
-CLAUSE_ALIAS(DType, DeviceType)
+CLAUSE_ALIAS(DType, DeviceType, false)
 VISIT_CLAUSE(FirstPrivate)
 VISIT_CLAUSE(If)
+VISIT_CLAUSE(Independent)
 VISIT_CLAUSE(NoCreate)
 VISIT_CLAUSE(NumGangs)
 VISIT_CLAUSE(NumWorkers)
 VISIT_CLAUSE(Present)
 VISIT_CLAUSE(Private)
 VISIT_CLAUSE(Reduction)
 VISIT_CLAUSE(Self)
+VISIT_CLAUSE(Seq)
 VISIT_CLAUSE(VectorLength)
 VISIT_CLAUSE(Wait)
 

diff --git a/clang/include/clang/Basic/Sanitizers.def b/clang/include/clang/Basic/Sanitizers.def
@@ -76,6 +76,9 @@ SANITIZER("fuzzer-no-link", FuzzerNoLink)
 // ThreadSanitizer
 SANITIZER("thread", Thread)
 
+// Numerical stability sanitizer.
+SANITIZER("numerical", NumericalStability)
+
 // LeakSanitizer
 SANITIZER("leak", Leak)
 

diff --git a/clang/include/clang/Basic/StmtNodes.td b/clang/include/clang/Basic/StmtNodes.td
@@ -302,3 +302,4 @@ def OpenACCConstructStmt : StmtNode<Stmt, /*abstract=*/1>;
 def OpenACCAssociatedStmtConstruct
     : StmtNode<OpenACCConstructStmt, /*abstract=*/1>;
 def OpenACCComputeConstruct : StmtNode<OpenACCAssociatedStmtConstruct>;
+def OpenACCLoopConstruct : StmtNode<OpenACCAssociatedStmtConstruct>;
diff --git a/clang/include/clang/Basic/TokenKinds.def b/clang/include/clang/Basic/TokenKinds.def
@@ -542,6 +542,8 @@ TYPE_TRAIT_2(__reference_converts_from_temporary, ReferenceConvertsFromTemporary
 // is not exposed to users.
 TYPE_TRAIT_2(/*EmptySpellingName*/, IsDeducible, KEYCXX)
 
+TYPE_TRAIT_1(__is_bitwise_cloneable, IsBitwiseCloneable, KEYALL)
+
 // Embarcadero Expression Traits
 EXPRESSION_TRAIT(__is_lvalue_expr, IsLValueExpr, KEYCXX)
 EXPRESSION_TRAIT(__is_rvalue_expr, IsRValueExpr, KEYCXX)

diff --git a/clang/include/clang/Basic/riscv_vector.td b/clang/include/clang/Basic/riscv_vector.td
@@ -2637,7 +2637,8 @@ let UnMaskedPolicyScheme = HasPassthruOperand in {
     defm vbrev   : RVVOutBuiltinSetZvbb;
     defm vclz    : RVVOutBuiltinSetZvbb;
     defm vctz    : RVVOutBuiltinSetZvbb;
-    defm vcpopv  : RVVOutBuiltinSetZvbb;
+    let IRName = "vcpopv", MaskedIRName = "vcpopv_mask" in
+    defm vcpop   : RVVOutBuiltinSetZvbb;
     let OverloadedName = "vwsll" in
     defm vwsll   : RVVSignedWidenBinBuiltinSetVwsll;
   }

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
@@ -3592,7 +3592,7 @@ def fopenmp_offload_mandatory : Flag<["-"], "fopenmp-offload-mandatory">, Group<
   HelpText<"Do not create a host fallback if offloading to the device fails.">,
   MarshallingInfoFlag<LangOpts<"OpenMPOffloadMandatory">>;
 def fopenmp_force_usm : Flag<["-"], "fopenmp-force-usm">, Group<f_Group>,
-  Flags<[NoArgumentUnused]>, Visibility<[ClangOption, CC1Option]>,
+  Flags<[NoArgumentUnused]>, Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>,
   HelpText<"Force behvaior as if the user specified pragma omp requires unified_shared_memory.">,
   MarshallingInfoFlag<LangOpts<"OpenMPForceUSM">>;
 def fopenmp_target_jit : Flag<["-"], "fopenmp-target-jit">, Group<f_Group>,
@@ -7724,8 +7724,8 @@ def pic_is_pie : Flag<["-"], "pic-is-pie">,
   MarshallingInfoFlag<LangOpts<"PIE">>;
 
 def mframe_pointer_EQ : Joined<["-"], "mframe-pointer=">,
-  HelpText<"Specify which frame pointers to retain.">, Values<"all,non-leaf,none">,
-  NormalizedValuesScope<"CodeGenOptions::FramePointerKind">, NormalizedValues<["All", "NonLeaf", "None"]>,
+  HelpText<"Specify which frame pointers to retain.">, Values<"all,non-leaf,reserved,none">,
+  NormalizedValuesScope<"CodeGenOptions::FramePointerKind">, NormalizedValues<["All", "NonLeaf", "Reserved", "None"]>,
   MarshallingInfoEnum<CodeGenOpts<"FramePointer">, "None">;
 
 

diff --git a/clang/include/clang/Driver/SanitizerArgs.h b/clang/include/clang/Driver/SanitizerArgs.h
@@ -103,6 +103,9 @@ class SanitizerArgs {
   bool needsCfiDiagRt() const;
   bool needsStatsRt() const { return Stats; }
   bool needsScudoRt() const { return Sanitizers.has(SanitizerKind::Scudo); }
+  bool needsNsanRt() const {
+    return Sanitizers.has(SanitizerKind::NumericalStability);
+  }
 
   bool hasMemTag() const {
     return hasMemtagHeap() || hasMemtagStack() || hasMemtagGlobals();

diff --git a/clang/include/clang/Driver/ToolChain.h b/clang/include/clang/Driver/ToolChain.h
@@ -205,7 +205,8 @@ class ToolChain {
 
   /// Executes the given \p Executable and returns the stdout.
   llvm::Expected<std::unique_ptr<llvm::MemoryBuffer>>
-  executeToolChainProgram(StringRef Executable) const;
+  executeToolChainProgram(StringRef Executable,
+                          unsigned SecondsToWait = 0) const;
 
   void setTripleEnvironment(llvm::Triple::EnvironmentType Env);
 

diff --git a/clang/include/clang/Lex/DependencyDirectivesScanner.h b/clang/include/clang/Lex/DependencyDirectivesScanner.h
@@ -17,7 +17,6 @@
 #ifndef LLVM_CLANG_LEX_DEPENDENCYDIRECTIVESSCANNER_H
 #define LLVM_CLANG_LEX_DEPENDENCYDIRECTIVESSCANNER_H
 
-#include "clang/Basic/LangOptions.h"
 #include "clang/Basic/SourceLocation.h"
 #include "llvm/ADT/ArrayRef.h"
 
@@ -118,7 +117,7 @@ struct Directive {
 bool scanSourceForDependencyDirectives(
     StringRef Input, SmallVectorImpl<dependency_directives_scan::Token> &Tokens,
     SmallVectorImpl<dependency_directives_scan::Directive> &Directives,
-    const LangOptions &LangOpts, DiagnosticsEngine *Diags = nullptr,
+    DiagnosticsEngine *Diags = nullptr,
     SourceLocation InputSourceLoc = SourceLocation());
 
 /// Print the previously scanned dependency directives as minimized source text.

diff --git a/clang/include/clang/Lex/Preprocessor.h b/clang/include/clang/Lex/Preprocessor.h
@@ -1360,7 +1360,7 @@ class Preprocessor {
 
     MacroState &S = CurSubmoduleState->Macros[II];
     auto *MD = S.getLatest();
-    while (MD && isa<VisibilityMacroDirective>(MD))
+    while (isa_and_nonnull<VisibilityMacroDirective>(MD))
       MD = MD->getPrevious();
     return MacroDefinition(dyn_cast_or_null<DefMacroDirective>(MD),
                            S.getActiveModuleMacros(*this, II),

diff --git a/clang/include/clang/Sema/Initialization.h b/clang/include/clang/Sema/Initialization.h
@@ -212,7 +212,7 @@ class alignas(8) InitializedEntity {
     struct C Capture;
   };
 
-  InitializedEntity() {};
+  InitializedEntity() {}
 
   /// Create the initialization entity for a variable.
   InitializedEntity(VarDecl *Var, EntityKind EK = EK_Variable)

diff --git a/clang/include/clang/Sema/Overload.h b/clang/include/clang/Sema/Overload.h
@@ -899,6 +899,8 @@ class Sema;
     /// object argument.
     bool IgnoreObjectArgument : 1;
 
+    bool TookAddressOfOverload : 1;
+
     /// True if the candidate was found using ADL.
     CallExpr::ADLCallKind IsADLCandidate : 1;
 
@@ -999,6 +1001,10 @@ class Sema;
       /// Initialization of an object of class type by constructor,
       /// using either a parenthesized or braced list of arguments.
       CSK_InitByConstructor,
+
+      /// C++ [over.match.call.general]
+      /// Resolve a call through the address of an overload set.
+      CSK_AddressOfOverloadSet,
     };
 
     /// Information about operator rewrites to consider when adding operator

diff --git a/clang/include/clang/Sema/SemaHLSL.h b/clang/include/clang/Sema/SemaHLSL.h
@@ -39,7 +39,7 @@ class SemaHLSL : public SemaBase {
                                           const AttributeCommonInfo &AL, int X,
                                           int Y, int Z);
   HLSLShaderAttr *mergeShaderAttr(Decl *D, const AttributeCommonInfo &AL,
-                                  HLSLShaderAttr::ShaderType ShaderType);
+                                  llvm::Triple::EnvironmentType ShaderType);
   HLSLParamModifierAttr *
   mergeParamModifierAttr(Decl *D, const AttributeCommonInfo &AL,
                          HLSLParamModifierAttr::Spelling Spelling);
@@ -48,8 +48,8 @@ class SemaHLSL : public SemaBase {
   void CheckSemanticAnnotation(FunctionDecl *EntryPoint, const Decl *Param,
                                const HLSLAnnotationAttr *AnnotationAttr);
   void DiagnoseAttrStageMismatch(
-      const Attr *A, HLSLShaderAttr::ShaderType Stage,
-      std::initializer_list<HLSLShaderAttr::ShaderType> AllowedStages);
+      const Attr *A, llvm::Triple::EnvironmentType Stage,
+      std::initializer_list<llvm::Triple::EnvironmentType> AllowedStages);
   void DiagnoseAvailabilityViolations(TranslationUnitDecl *TU);
 
   void handleNumThreadsAttr(Decl *D, const ParsedAttr &AL);

diff --git a/clang/include/clang/Sema/SemaObjC.h b/clang/include/clang/Sema/SemaObjC.h
@@ -383,7 +383,7 @@ class SemaObjC : public SemaBase {
   void AddAnyMethodToGlobalPool(Decl *D);
 
   void ActOnStartOfObjCMethodDef(Scope *S, Decl *D);
-  bool isObjCMethodDecl(Decl *D) { return D && isa<ObjCMethodDecl>(D); }
+  bool isObjCMethodDecl(Decl *D) { return isa_and_nonnull<ObjCMethodDecl>(D); }
 
   /// CheckImplementationIvars - This routine checks if the instance variables
   /// listed in the implelementation match those listed in the interface.

diff --git a/clang/include/clang/Sema/SemaOpenACC.h b/clang/include/clang/Sema/SemaOpenACC.h
@@ -15,6 +15,7 @@
 #define LLVM_CLANG_SEMA_SEMAOPENACC_H
 
 #include "clang/AST/DeclGroup.h"
+#include "clang/AST/StmtOpenACC.h"
 #include "clang/Basic/OpenACCKinds.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Sema/Ownership.h"
@@ -25,6 +26,15 @@ namespace clang {
 class OpenACCClause;
 
 class SemaOpenACC : public SemaBase {
+private:
+  /// A collection of loop constructs in the compute construct scope that
+  /// haven't had their 'parent' compute construct set yet. Entires will only be
+  /// made to this list in the case where we know the loop isn't an orphan.
+  llvm::SmallVector<OpenACCLoopConstruct *> ParentlessLoopConstructs;
+  /// Whether we are inside of a compute construct, and should add loops to the
+  /// above collection.
+  bool InsideComputeConstruct = false;
+
 public:
   // Redeclaration of the version in OpenACCClause.h.
   using DeviceTypeArgument = std::pair<IdentifierInfo *, SourceLocation>;
@@ -394,7 +404,8 @@ class SemaOpenACC : public SemaBase {
   bool ActOnStartDeclDirective(OpenACCDirectiveKind K, SourceLocation StartLoc);
   /// Called when we encounter an associated statement for our construct, this
   /// should check legality of the statement as it appertains to this Construct.
-  StmtResult ActOnAssociatedStmt(OpenACCDirectiveKind K, StmtResult AssocStmt);
+  StmtResult ActOnAssociatedStmt(SourceLocation DirectiveLoc,
+                                 OpenACCDirectiveKind K, StmtResult AssocStmt);
 
   /// Called after the directive has been completely parsed, including the
   /// declaration group or associated statement.
@@ -431,6 +442,20 @@ class SemaOpenACC : public SemaBase {
                                    Expr *LowerBound,
                                    SourceLocation ColonLocFirst, Expr *Length,
                                    SourceLocation RBLoc);
+
+  /// Helper type for the registration/assignment of constructs that need to
+  /// 'know' about their parent constructs and hold a reference to them, such as
+  /// Loop needing its parent construct.
+  class AssociatedStmtRAII {
+    SemaOpenACC &SemaRef;
+    bool WasInsideComputeConstruct;
+    OpenACCDirectiveKind DirKind;
+    llvm::SmallVector<OpenACCLoopConstruct *> ParentlessLoopConstructs;
+
+  public:
+    AssociatedStmtRAII(SemaOpenACC &, OpenACCDirectiveKind);
+    ~AssociatedStmtRAII();
+  };
 };
 
 } // namespace clang

diff --git a/clang/include/clang/Serialization/ASTBitCodes.h b/clang/include/clang/Serialization/ASTBitCodes.h
@@ -255,6 +255,12 @@ class DeclOffset {
   }
 };
 
+// The unaligned decl ID used in the Blobs of bistreams.
+using unaligned_decl_id_t =
+    llvm::support::detail::packed_endian_specific_integral<
+        serialization::DeclID, llvm::endianness::native,
+        llvm::support::unaligned>;
+
 /// The number of predefined preprocessed entity IDs.
 const unsigned int NUM_PREDEF_PP_ENTITY_IDS = 1;
 
@@ -1946,6 +1952,7 @@ enum StmtCode {
 
   // OpenACC Constructs
   STMT_OPENACC_COMPUTE_CONSTRUCT,
+  STMT_OPENACC_LOOP_CONSTRUCT,
 };
 
 /// The kinds of designators that can occur in a
@@ -1979,33 +1986,44 @@ enum CleanupObjectKind { COK_Block, COK_CompoundLiteral };
 
 /// Describes the categories of an Objective-C class.
 struct ObjCCategoriesInfo {
-  // The ID of the definition
-  LocalDeclID DefinitionID;
+  // The ID of the definition. Use unaligned_decl_id_t to keep
+  // ObjCCategoriesInfo 32-bit aligned.
+  unaligned_decl_id_t DefinitionID;
 
   // Offset into the array of category lists.
   unsigned Offset;
 
+  ObjCCategoriesInfo() = default;
+  ObjCCategoriesInfo(LocalDeclID ID, unsigned Offset)
+      : DefinitionID(ID.get()), Offset(Offset) {}
+
+  LocalDeclID getDefinitionID() const { return LocalDeclID(DefinitionID); }
+
   friend bool operator<(const ObjCCategoriesInfo &X,
                         const ObjCCategoriesInfo &Y) {
-    return X.DefinitionID < Y.DefinitionID;
+    return X.getDefinitionID() < Y.getDefinitionID();
   }
 
   friend bool operator>(const ObjCCategoriesInfo &X,
                         const ObjCCategoriesInfo &Y) {
-    return X.DefinitionID > Y.DefinitionID;
+    return X.getDefinitionID() > Y.getDefinitionID();
   }
 
   friend bool operator<=(const ObjCCategoriesInfo &X,
                          const ObjCCategoriesInfo &Y) {
-    return X.DefinitionID <= Y.DefinitionID;
+    return X.getDefinitionID() <= Y.getDefinitionID();
   }
 
   friend bool operator>=(const ObjCCategoriesInfo &X,
                          const ObjCCategoriesInfo &Y) {
-    return X.DefinitionID >= Y.DefinitionID;
+    return X.getDefinitionID() >= Y.getDefinitionID();
   }
 };
 
+static_assert(alignof(ObjCCategoriesInfo) <= 4);
+static_assert(std::is_standard_layout_v<ObjCCategoriesInfo> &&
+              std::is_trivial_v<ObjCCategoriesInfo>);
+
 /// A key used when looking up entities by \ref DeclarationName.
 ///
 /// Different \ref DeclarationNames are mapped to different keys, but the

diff --git a/clang/include/clang/Serialization/ASTReader.h b/clang/include/clang/Serialization/ASTReader.h
@@ -504,12 +504,6 @@ class ASTReader
   /// = I + 1 has already been loaded.
   llvm::PagedVector<Decl *> DeclsLoaded;
 
-  using GlobalDeclMapType = ContinuousRangeMap<GlobalDeclID, ModuleFile *, 4>;
-
-  /// Mapping from global declaration IDs to the module in which the
-  /// declaration resides.
-  GlobalDeclMapType GlobalDeclMap;
-
   using FileOffset = std::pair<ModuleFile *, uint64_t>;
   using FileOffsetsTy = SmallVector<FileOffset, 2>;
   using DeclUpdateOffsetsMap = llvm::DenseMap<GlobalDeclID, FileOffsetsTy>;
@@ -592,10 +586,11 @@ class ASTReader
 
   struct FileDeclsInfo {
     ModuleFile *Mod = nullptr;
-    ArrayRef<LocalDeclID> Decls;
+    ArrayRef<serialization::unaligned_decl_id_t> Decls;
 
     FileDeclsInfo() = default;
-    FileDeclsInfo(ModuleFile *Mod, ArrayRef<LocalDeclID> Decls)
+    FileDeclsInfo(ModuleFile *Mod,
+                  ArrayRef<serialization::unaligned_decl_id_t> Decls)
         : Mod(Mod), Decls(Decls) {}
   };
 
@@ -604,11 +599,7 @@ class ASTReader
 
   /// An array of lexical contents of a declaration context, as a sequence of
   /// Decl::Kind, DeclID pairs.
-  using unaligned_decl_id_t =
-      llvm::support::detail::packed_endian_specific_integral<
-          serialization::DeclID, llvm::endianness::native,
-          llvm::support::unaligned>;
-  using LexicalContents = ArrayRef<unaligned_decl_id_t>;
+  using LexicalContents = ArrayRef<serialization::unaligned_decl_id_t>;
 
   /// Map from a DeclContext to its lexical contents.
   llvm::DenseMap<const DeclContext*, std::pair<ModuleFile*, LexicalContents>>
@@ -1489,22 +1480,23 @@ class ASTReader
                                unsigned ClientLoadCapabilities);
 
 public:
-  class ModuleDeclIterator : public llvm::iterator_adaptor_base<
-                                 ModuleDeclIterator, const LocalDeclID *,
-                                 std::random_access_iterator_tag, const Decl *,
-                                 ptrdiff_t, const Decl *, const Decl *> {
+  class ModuleDeclIterator
+      : public llvm::iterator_adaptor_base<
+            ModuleDeclIterator, const serialization::unaligned_decl_id_t *,
+            std::random_access_iterator_tag, const Decl *, ptrdiff_t,
+            const Decl *, const Decl *> {
     ASTReader *Reader = nullptr;
     ModuleFile *Mod = nullptr;
 
   public:
     ModuleDeclIterator() : iterator_adaptor_base(nullptr) {}
 
     ModuleDeclIterator(ASTReader *Reader, ModuleFile *Mod,
-                       const LocalDeclID *Pos)
+                       const serialization::unaligned_decl_id_t *Pos)
         : iterator_adaptor_base(Pos), Reader(Reader), Mod(Mod) {}
 
     value_type operator*() const {
-      return Reader->GetDecl(Reader->getGlobalDeclID(*Mod, *I));
+      return Reader->GetDecl(Reader->getGlobalDeclID(*Mod, (LocalDeclID)*I));
     }
 
     value_type operator->() const { return **this; }
@@ -1544,6 +1536,9 @@ class ASTReader
              StringRef Arg2 = StringRef(), StringRef Arg3 = StringRef()) const;
   void Error(llvm::Error &&Err) const;
 
+  /// Translate a \param GlobalDeclID to the index of DeclsLoaded array.
+  unsigned translateGlobalDeclIDToIndex(GlobalDeclID ID) const;
+
 public:
   /// Load the AST file and validate its contents against the given
   /// Preprocessor.
@@ -1915,7 +1910,8 @@ class ASTReader
 
   /// Retrieve the module file that owns the given declaration, or NULL
   /// if the declaration is not from a module file.
-  ModuleFile *getOwningModuleFile(const Decl *D);
+  ModuleFile *getOwningModuleFile(const Decl *D) const;
+  ModuleFile *getOwningModuleFile(GlobalDeclID ID) const;
 
   /// Returns the source location for the decl \p ID.
   SourceLocation getSourceLocationForDeclID(GlobalDeclID ID);

diff --git a/clang/include/clang/Serialization/ModuleFile.h b/clang/include/clang/Serialization/ModuleFile.h
@@ -454,23 +454,11 @@ class ModuleFile {
   /// by the declaration ID (-1).
   const DeclOffset *DeclOffsets = nullptr;
 
-  /// Base declaration ID for declarations local to this module.
-  serialization::DeclID BaseDeclID = 0;
-
-  /// Remapping table for declaration IDs in this module.
-  ContinuousRangeMap<serialization::DeclID, int, 2> DeclRemap;
-
-  /// Mapping from the module files that this module file depends on
-  /// to the base declaration ID for that module as it is understood within this
-  /// module.
-  ///
-  /// This is effectively a reverse global-to-local mapping for declaration
-  /// IDs, so that we can interpret a true global ID (for this translation unit)
-  /// as a local ID (for this module file).
-  llvm::DenseMap<ModuleFile *, serialization::DeclID> GlobalToLocalDeclIDs;
+  /// Base declaration index in ASTReader for declarations local to this module.
+  unsigned BaseDeclIndex = 0;
 
   /// Array of file-level DeclIDs sorted by file.
-  const LocalDeclID *FileSortedDecls = nullptr;
+  const serialization::unaligned_decl_id_t *FileSortedDecls = nullptr;
   unsigned NumFileSortedDecls = 0;
 
   /// Array of category list location information within this

diff --git a/clang/include/clang/Serialization/ModuleManager.h b/clang/include/clang/Serialization/ModuleManager.h
@@ -45,7 +45,7 @@ namespace serialization {
 /// Manages the set of modules loaded by an AST reader.
 class ModuleManager {
   /// The chain of AST files, in the order in which we started to load
-  /// them (this order isn't really useful for anything).
+  /// them.
   SmallVector<std::unique_ptr<ModuleFile>, 2> Chain;
 
   /// The chain of non-module PCH files. The first entry is the one named

diff --git a/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td b/clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
@@ -36,13 +36,17 @@ def CoreAlpha : Package<"core">, ParentPackage<Alpha>;
 // Note: OptIn is *not* intended for checkers that are too noisy to be on by
 // default. Such checkers belong in the alpha package.
 def OptIn : Package<"optin">;
+
 def CoreOptIn : Package<"core">, ParentPackage<OptIn>;
 
 // In the Portability package reside checkers for finding code that relies on
 // implementation-defined behavior. Such checks are wanted for cross-platform
 // development, but unwanted for developers who target only a single platform.
 def PortabilityOptIn : Package<"portability">, ParentPackage<OptIn>;
 
+// Optional checkers related to taint security analysis.
+def TaintOptIn : Package<"taint">, ParentPackage<OptIn>;
+
 def Nullability : Package<"nullability">,
   PackageOptions<[
     CmdLineOption<Boolean,
@@ -1718,6 +1722,23 @@ def UnixAPIPortabilityChecker : Checker<"UnixAPI">,
 
 } // end optin.portability
 
+
+//===----------------------------------------------------------------------===//
+// Taint checkers.
+//===----------------------------------------------------------------------===//
+
+let ParentPackage = TaintOptIn in {
+
+def TaintedAllocChecker: Checker<"TaintedAlloc">,
+  HelpText<"Check for memory allocations, where the size parameter "
+           "might be a tainted (attacker controlled) value.">,
+  Dependencies<[DynamicMemoryModeling]>,
+  //FIXME: GenericTaintChecker should be a dependency, but only after it
+  //is transformed into a modeling checker
+  Documentation<HasDocumentation>;
+
+} // end "optin.taint"
+
 //===----------------------------------------------------------------------===//
 // NonDeterminism checkers.
 //===----------------------------------------------------------------------===//

diff --git a/clang/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h b/clang/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h
@@ -781,7 +781,7 @@ class SymbolicRegion : public SubRegion {
       : SubRegion(sreg, SymbolicRegionKind), sym(s) {
     // Because pointer arithmetic is represented by ElementRegion layers,
     // the base symbol here should not contain any arithmetic.
-    assert(s && isa<SymbolData>(s));
+    assert(isa_and_nonnull<SymbolData>(s));
     assert(s->getType()->isAnyPointerType() ||
            s->getType()->isReferenceType() ||
            s->getType()->isBlockPointerType());

diff --git a/clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h b/clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h
@@ -363,8 +363,7 @@ class DependencyScanningWorkerFilesystem
   ///
   /// Returns true if the directive tokens are populated for this file entry,
   /// false if not (i.e. this entry is not a file or its scan fails).
-  bool ensureDirectiveTokensArePopulated(EntryRef Entry,
-                                         const LangOptions &LangOpts);
+  bool ensureDirectiveTokensArePopulated(EntryRef Entry);
 
   /// Check whether \p Path exists. By default checks cached result of \c
   /// status(), and falls back on FS if unable to do so.

diff --git a/clang/include/clang/Tooling/Syntax/Tokens.h b/clang/include/clang/Tooling/Syntax/Tokens.h
@@ -292,9 +292,9 @@ class TokenBuffer {
   ///     "DECL", "(", "a", ")", ";"}
   llvm::ArrayRef<syntax::Token> spelledTokens(FileID FID) const;
 
-  /// Returns the spelled Token starting at Loc, if there are no such tokens
+  /// Returns the spelled Token containing the Loc, if there are no such tokens
   /// returns nullptr.
-  const syntax::Token *spelledTokenAt(SourceLocation Loc) const;
+  const syntax::Token *spelledTokenContaining(SourceLocation Loc) const;
 
   /// Get all tokens that expand a macro in \p FID. For the following input
   ///     #define FOO B

diff --git a/clang/lib/ARCMigrate/TransUnbridgedCasts.cpp b/clang/lib/ARCMigrate/TransUnbridgedCasts.cpp
@@ -371,7 +371,7 @@ class UnbridgedCastRewriter : public RecursiveASTVisitor<UnbridgedCastRewriter>{
       Stmt *parent = E;
       do {
         parent = StmtMap->getParentIgnoreParenImpCasts(parent);
-      } while (parent && isa<FullExpr>(parent));
+      } while (isa_and_nonnull<FullExpr>(parent));
 
       if (ReturnStmt *retS = dyn_cast_or_null<ReturnStmt>(parent)) {
         std::string note = "remove the cast and change return type of function "

diff --git a/clang/lib/AST/ASTDumper.cpp b/clang/lib/AST/ASTDumper.cpp
@@ -360,3 +360,37 @@ LLVM_DUMP_METHOD void ConceptReference::dump(raw_ostream &OS) const {
   ASTDumper P(OS, Ctx, Ctx.getDiagnostics().getShowColors());
   P.Visit(this);
 }
+
+//===----------------------------------------------------------------------===//
+// TemplateName method implementations
+//===----------------------------------------------------------------------===//
+
+// FIXME: These are actually using the TemplateArgument dumper, through
+// an implicit conversion. The dump will claim this is a template argument,
+// which is misleading.
+
+LLVM_DUMP_METHOD void TemplateName::dump() const {
+  ASTDumper Dumper(llvm::errs(), /*ShowColors=*/false);
+  Dumper.Visit(*this);
+}
+
+LLVM_DUMP_METHOD void TemplateName::dump(llvm::raw_ostream &OS,
+                                         const ASTContext &Context) const {
+  ASTDumper Dumper(OS, Context, Context.getDiagnostics().getShowColors());
+  Dumper.Visit(*this);
+}
+
+//===----------------------------------------------------------------------===//
+// TemplateArgument method implementations
+//===----------------------------------------------------------------------===//
+
+LLVM_DUMP_METHOD void TemplateArgument::dump() const {
+  ASTDumper Dumper(llvm::errs(), /*ShowColors=*/false);
+  Dumper.Visit(*this);
+}
+
+LLVM_DUMP_METHOD void TemplateArgument::dump(llvm::raw_ostream &OS,
+                                             const ASTContext &Context) const {
+  ASTDumper Dumper(OS, Context, Context.getDiagnostics().getShowColors());
+  Dumper.Visit(*this);
+}
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
@@ -1505,7 +1505,7 @@ ExpectedType ASTNodeImporter::VisitInjectedClassNameType(
   // The InjectedClassNameType is created in VisitRecordDecl when the
   // T->getDecl() is imported. Here we can return the existing type.
   const Type *Ty = (*ToDeclOrErr)->getTypeForDecl();
-  assert(Ty && isa<InjectedClassNameType>(Ty));
+  assert(isa_and_nonnull<InjectedClassNameType>(Ty));
   return QualType(Ty, 0);
 }
 

diff --git a/clang/lib/AST/CMakeLists.txt b/clang/lib/AST/CMakeLists.txt
@@ -87,6 +87,7 @@ add_clang_library(clangAST
   Interp/Record.cpp
   Interp/Source.cpp
   Interp/State.cpp
+  Interp/MemberPointer.cpp
   Interp/InterpShared.cpp
   ItaniumCXXABI.cpp
   ItaniumMangle.cpp

diff --git a/clang/lib/AST/CommentParser.cpp b/clang/lib/AST/CommentParser.cpp
@@ -89,6 +89,31 @@ class TextTokenRetokenizer {
     }
   }
 
+  /// Extract a template type
+  bool lexTemplate(SmallString<32> &WordText) {
+    unsigned BracketCount = 0;
+    while (!isEnd()) {
+      const char C = peek();
+      WordText.push_back(C);
+      consumeChar();
+      switch (C) {
+      case '<': {
+        BracketCount++;
+        break;
+      }
+      case '>': {
+        BracketCount--;
+        if (!BracketCount)
+          return true;
+        break;
+      }
+      default:
+        break;
+      }
+    }
+    return false;
+  }
+
   /// Add a token.
   /// Returns true on success, false if there are no interesting tokens to
   /// fetch from lexer.
@@ -149,6 +174,54 @@ class TextTokenRetokenizer {
     addToken();
   }
 
+  /// Extract a type argument
+  bool lexType(Token &Tok) {
+    if (isEnd())
+      return false;
+
+    // Save current position in case we need to rollback because the type is
+    // empty.
+    Position SavedPos = Pos;
+
+    // Consume any leading whitespace.
+    consumeWhitespace();
+    SmallString<32> WordText;
+    const char *WordBegin = Pos.BufferPtr;
+    SourceLocation Loc = getSourceLocation();
+
+    while (!isEnd()) {
+      const char C = peek();
+      // For non-whitespace characters we check if it's a template or otherwise
+      // continue reading the text into a word.
+      if (!isWhitespace(C)) {
+        if (C == '<') {
+          if (!lexTemplate(WordText))
+            return false;
+        } else {
+          WordText.push_back(C);
+          consumeChar();
+        }
+      } else {
+        consumeChar();
+        break;
+      }
+    }
+
+    const unsigned Length = WordText.size();
+    if (Length == 0) {
+      Pos = SavedPos;
+      return false;
+    }
+
+    char *TextPtr = Allocator.Allocate<char>(Length + 1);
+
+    memcpy(TextPtr, WordText.c_str(), Length + 1);
+    StringRef Text = StringRef(TextPtr, Length);
+
+    formTokenWithChars(Tok, Loc, WordBegin, Length, Text);
+    return true;
+  }
+
   /// Extract a word -- sequence of non-whitespace characters.
   bool lexWord(Token &Tok) {
     if (isEnd())
@@ -304,6 +377,23 @@ Parser::parseCommandArgs(TextTokenRetokenizer &Retokenizer, unsigned NumArgs) {
   return llvm::ArrayRef(Args, ParsedArgs);
 }
 
+ArrayRef<Comment::Argument>
+Parser::parseThrowCommandArgs(TextTokenRetokenizer &Retokenizer,
+                              unsigned NumArgs) {
+  auto *Args = new (Allocator.Allocate<Comment::Argument>(NumArgs))
+      Comment::Argument[NumArgs];
+  unsigned ParsedArgs = 0;
+  Token Arg;
+
+  while (ParsedArgs < NumArgs && Retokenizer.lexType(Arg)) {
+    Args[ParsedArgs] = Comment::Argument{
+        SourceRange(Arg.getLocation(), Arg.getEndLocation()), Arg.getText()};
+    ParsedArgs++;
+  }
+
+  return llvm::ArrayRef(Args, ParsedArgs);
+}
+
 BlockCommandComment *Parser::parseBlockCommand() {
   assert(Tok.is(tok::backslash_command) || Tok.is(tok::at_command));
 
@@ -356,6 +446,9 @@ BlockCommandComment *Parser::parseBlockCommand() {
       parseParamCommandArgs(PC, Retokenizer);
     else if (TPC)
       parseTParamCommandArgs(TPC, Retokenizer);
+    else if (Info->IsThrowsCommand)
+      S.actOnBlockCommandArgs(
+          BC, parseThrowCommandArgs(Retokenizer, Info->NumArgs));
     else
       S.actOnBlockCommandArgs(BC, parseCommandArgs(Retokenizer, Info->NumArgs));
 

diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
@@ -74,18 +74,17 @@ void *Decl::operator new(std::size_t Size, const ASTContext &Context,
                          GlobalDeclID ID, std::size_t Extra) {
   // Allocate an extra 8 bytes worth of storage, which ensures that the
   // resulting pointer will still be 8-byte aligned.
-  static_assert(sizeof(unsigned) * 2 >= alignof(Decl),
-                "Decl won't be misaligned");
+  static_assert(sizeof(uint64_t) >= alignof(Decl), "Decl won't be misaligned");
   void *Start = Context.Allocate(Size + Extra + 8);
   void *Result = (char*)Start + 8;
 
-  unsigned *PrefixPtr = (unsigned *)Result - 2;
+  uint64_t *PrefixPtr = (uint64_t *)Result - 1;
 
-  // Zero out the first 4 bytes; this is used to store the owning module ID.
-  PrefixPtr[0] = 0;
+  *PrefixPtr = ID.get();
 
-  // Store the global declaration ID in the second 4 bytes.
-  PrefixPtr[1] = ID.get();
+  // We leave the upper 16 bits to store the module IDs. 48 bits should be
+  // sufficient to store a declaration ID.
+  assert(*PrefixPtr < llvm::maskTrailingOnes<uint64_t>(48));
 
   return Result;
 }
@@ -111,6 +110,29 @@ void *Decl::operator new(std::size_t Size, const ASTContext &Ctx,
   return ::operator new(Size + Extra, Ctx);
 }
 
+GlobalDeclID Decl::getGlobalID() const {
+  if (!isFromASTFile())
+    return GlobalDeclID();
+  // See the comments in `Decl::operator new` for details.
+  uint64_t ID = *((const uint64_t *)this - 1);
+  return GlobalDeclID(ID & llvm::maskTrailingOnes<uint64_t>(48));
+}
+
+unsigned Decl::getOwningModuleID() const {
+  if (!isFromASTFile())
+    return 0;
+
+  uint64_t ID = *((const uint64_t *)this - 1);
+  return ID >> 48;
+}
+
+void Decl::setOwningModuleID(unsigned ID) {
+  assert(isFromASTFile() && "Only works on a deserialized declaration");
+  uint64_t *IDAddress = (uint64_t *)this - 1;
+  *IDAddress &= llvm::maskTrailingOnes<uint64_t>(48);
+  *IDAddress |= (uint64_t)ID << 48;
+}
+
 Module *Decl::getOwningModuleSlow() const {
   assert(isFromASTFile() && "Not from AST file?");
   return getASTContext().getExternalSource()->getModule(getOwningModuleID());
@@ -1094,7 +1116,7 @@ bool Decl::isInExportDeclContext() const {
   while (DC && !isa<ExportDecl>(DC))
     DC = DC->getLexicalParent();
 
-  return DC && isa<ExportDecl>(DC);
+  return isa_and_nonnull<ExportDecl>(DC);
 }
 
 bool Decl::isInAnotherModuleUnit() const {
@@ -2163,3 +2185,7 @@ DependentDiagnostic *DependentDiagnostic::Create(ASTContext &C,
 
   return DD;
 }
+
+unsigned DeclIDBase::getLocalDeclIndex() const {
+  return ID & llvm::maskTrailingOnes<DeclID>(32);
+}
diff --git a/clang/lib/AST/DeclCXX.cpp b/clang/lib/AST/DeclCXX.cpp
@@ -68,8 +68,8 @@ void LazyASTUnresolvedSet::getFromExternalSource(ASTContext &C) const {
   assert(Source && "getFromExternalSource with no external source");
 
   for (ASTUnresolvedSet::iterator I = Impl.begin(); I != Impl.end(); ++I)
-    I.setDecl(cast<NamedDecl>(Source->GetExternalDecl(
-        GlobalDeclID(reinterpret_cast<uintptr_t>(I.getDecl()) >> 2))));
+    I.setDecl(
+        cast<NamedDecl>(Source->GetExternalDecl(GlobalDeclID(I.getDeclID()))));
   Impl.Decls.setLazy(false);
 }
 

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
@@ -837,7 +837,7 @@ std::string PredefinedExpr::ComputeName(PredefinedIdentKind IK,
     typedef SmallVector<const ClassTemplateSpecializationDecl *, 8> SpecsTy;
     SpecsTy Specs;
     const DeclContext *Ctx = FD->getDeclContext();
-    while (Ctx && isa<NamedDecl>(Ctx)) {
+    while (isa_and_nonnull<NamedDecl>(Ctx)) {
       const ClassTemplateSpecializationDecl *Spec
                                = dyn_cast<ClassTemplateSpecializationDecl>(Ctx);
       if (Spec && !Spec->isExplicitSpecialization())
@@ -3067,7 +3067,7 @@ Expr *Expr::IgnoreParenCasts() {
 
 Expr *Expr::IgnoreConversionOperatorSingleStep() {
   if (auto *MCE = dyn_cast<CXXMemberCallExpr>(this)) {
-    if (MCE->getMethodDecl() && isa<CXXConversionDecl>(MCE->getMethodDecl()))
+    if (isa_and_nonnull<CXXConversionDecl>(MCE->getMethodDecl()))
       return MCE->getImplicitObjectArgument();
   }
   return this;

diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
@@ -2130,7 +2130,7 @@ static bool IsWeakLValue(const LValue &Value) {
 
 static bool isZeroSized(const LValue &Value) {
   const ValueDecl *Decl = GetLValueBaseDecl(Value);
-  if (Decl && isa<VarDecl>(Decl)) {
+  if (isa_and_nonnull<VarDecl>(Decl)) {
     QualType Ty = Decl->getType();
     if (Ty->isArrayType())
       return Ty->isIncompleteType() ||
@@ -15209,11 +15209,21 @@ bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
       APFloat &ResI = Result.getComplexFloatImag();
       if (LHSReal) {
         assert(!RHSReal && "Cannot have two real operands for a complex op!");
-        ResR = A * C;
-        ResI = A * D;
+        ResR = A;
+        ResI = A;
+        // ResR = A * C;
+        // ResI = A * D;
+        if (!handleFloatFloatBinOp(Info, E, ResR, BO_Mul, C) ||
+            !handleFloatFloatBinOp(Info, E, ResI, BO_Mul, D))
+          return false;
       } else if (RHSReal) {
-        ResR = C * A;
-        ResI = C * B;
+        // ResR = C * A;
+        // ResI = C * B;
+        ResR = C;
+        ResI = C;
+        if (!handleFloatFloatBinOp(Info, E, ResR, BO_Mul, A) ||
+            !handleFloatFloatBinOp(Info, E, ResI, BO_Mul, B))
+          return false;
       } else {
         // In the fully general case, we need to handle NaNs and infinities
         // robustly.
@@ -15289,8 +15299,13 @@ bool ComplexExprEvaluator::VisitBinaryOperator(const BinaryOperator *E) {
       APFloat &ResR = Result.getComplexFloatReal();
       APFloat &ResI = Result.getComplexFloatImag();
       if (RHSReal) {
-        ResR = A / C;
-        ResI = B / C;
+        ResR = A;
+        ResI = B;
+        // ResR = A / C;
+        // ResI = B / C;
+        if (!handleFloatFloatBinOp(Info, E, ResR, BO_Div, C) ||
+            !handleFloatFloatBinOp(Info, E, ResI, BO_Div, C))
+          return false;
       } else {
         if (LHSReal) {
           // No real optimizations we can do here, stub out with zero.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		// RUN: not clang-tidy %s -checks='-*,misc-header-include-cycle'

		#include "header-include-cycle.self.cpp"
-Original file line number
+Diff line change
@@ Expand Up / @@ -72,7 +72,7 @@ class PrintFunctionsConsumer : public ASTConsumer { @@
               *sema.LateParsedTemplateMap.find(FD)->second;
           sema.LateTemplateParser(sema.OpaqueParser, LPT);
           llvm::errs() << "late-parsed-decl: \"" << FD->getNameAsString() << "\"\n";
-        }
+        }
       }
     };
@@ Expand Down @@