--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGenCXX/global-init.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,215 @@
+// RUN: %clang_cc1 -triple=x86_64-apple-darwin10 -emit-llvm -fexceptions %s -o - |FileCheck %s
+// RUN: %clang_cc1 -triple=x86_64-apple-darwin10 -emit-llvm %s -o - |FileCheck -check-prefix CHECK-NOEXC %s
+// RUN: %clang_cc1 -triple=x86_64-apple-darwin10 -emit-llvm -mframe-pointer=non-leaf %s -o - \
+// RUN:   | FileCheck -check-prefix CHECK-FP %s
+// RUN: %clang_cc1 -triple=x86_64-apple-darwin10 -emit-llvm %s -o - -fno-builtin \
+// RUN:   | FileCheck -check-prefix CHECK-NOBUILTIN %s
+
+struct A {
+  A();
+  ~A();
+};
+
+struct B { B(); ~B(); };
+
+struct C { void *field; };
+
+struct D { ~D(); };
+
+// CHECK: @__dso_handle = external hidden global i8
+// CHECK: @c = global %struct.C zeroinitializer, align 8
+
+// PR6205: The casts should not require global initializers
+// CHECK: @_ZN6PR59741cE = external global %"struct.PR5974::C"
+// CHECK: @_ZN6PR59741aE = global %"struct.PR5974::A"* getelementptr inbounds (%"struct.PR5974::C", %"struct.PR5974::C"* @_ZN6PR59741cE, i32 0, i32 0)
+// CHECK: @_ZN6PR59741bE = global %"struct.PR5974::B"* bitcast (i8* getelementptr (i8, i8* bitcast (%"struct.PR5974::C"* @_ZN6PR59741cE to i8*), i64 4) to %"struct.PR5974::B"*), align 8
+
+// CHECK: call void @_ZN1AC1Ev(%struct.A* @a)
+// CHECK: call i32 @__cxa_atexit(void (i8*)* bitcast (void (%struct.A*)* @_ZN1AD1Ev to void (i8*)*), i8* getelementptr inbounds (%struct.A, %struct.A* @a, i32 0, i32 0), i8* @__dso_handle)
+A a;
+
+// CHECK: call void @_ZN1BC1Ev(%struct.B* @b)
+// CHECK: call i32 @__cxa_atexit(void (i8*)* bitcast (void (%struct.B*)* @_ZN1BD1Ev to void (i8*)*), i8* getelementptr inbounds (%struct.B, %struct.B* @b, i32 0, i32 0), i8* @__dso_handle)
+B b;
+
+// PR6205: this should not require a global initializer
+// CHECK-NOT: call void @_ZN1CC1Ev(%struct.C* @c)
+C c;
+
+// CHECK: call i32 @__cxa_atexit(void (i8*)* bitcast (void (%struct.D*)* @_ZN1DD1Ev to void (i8*)*), i8* getelementptr inbounds (%struct.D, %struct.D* @d, i32 0, i32 0), i8* @__dso_handle)
+D d;
+
+// <rdar://problem/7458115>
+namespace test1 {
+  int f();
+  const int x = f();   // This has side-effects and gets emitted immediately.
+  const int y = x - 1; // This gets deferred.
+  const int z = ~y;    // This also gets deferred, but gets "undeferred" before y.
+  int test() { return z; }
+// CHECK-LABEL:      define i32 @_ZN5test14testEv()
+
+  // All of these initializers end up delayed, so we check them later.
+}
+
+// <rdar://problem/8246444>
+namespace test2 {
+  struct allocator { allocator(); ~allocator(); };
+  struct A { A(const allocator &a = allocator()); ~A(); };
+
+  A a;
+// CHECK: call void @_ZN5test29allocatorC1Ev(
+// CHECK: invoke void @_ZN5test21AC1ERKNS_9allocatorE(
+// CHECK: call void @_ZN5test29allocatorD1Ev(
+// CHECK: call i32 @__cxa_atexit({{.*}} @_ZN5test21AD1Ev {{.*}} @_ZN5test21aE
+}
+
+namespace test3 {
+  // Tested at the beginning of the file.
+  const char * const var = "string";
+  extern const char * const var;
+
+  const char *test() { return var; }
+}
+
+namespace test4 {
+  struct A {
+    A();
+  };
+  extern int foo();
+
+  // This needs an initialization function and guard variables.
+  // CHECK: load i8, i8* bitcast (i64* @_ZGVN5test41xE
+  // CHECK: [[CALL:%.*]] = call i32 @_ZN5test43fooEv
+  // CHECK-NEXT: store i32 [[CALL]], i32* @_ZN5test41xE
+  // CHECK-NEXT: store i64 1, i64* @_ZGVN5test41xE
+  __attribute__((weak)) int x = foo();
+}
+
+namespace PR5974 {
+  struct A { int a; };
+  struct B { int b; };
+  struct C : A, B { int c; };
+
+  extern C c;
+
+  // These should not require global initializers.
+  A* a = &c;
+  B* b = &c;
+}
+
+// PR9570: the indirect field shouldn't crash IR gen.
+namespace test5 {
+  static union {
+    unsigned bar[4096] __attribute__((aligned(128)));
+  };
+}
+
+namespace std { struct type_info; }
+
+namespace test6 {
+  struct A { virtual ~A(); };
+  struct B : A {};
+  extern A *p;
+
+  // We must emit a dynamic initializer for 'q', because it could throw.
+  B *const q = &dynamic_cast<B&>(*p);
+  // CHECK: call void @__cxa_bad_cast()
+  // CHECK: store {{.*}} @_ZN5test6L1qE
+
+  // We don't need to emit 'r' at all, because it has internal linkage, is
+  // unused, and its initialization has no side-effects.
+  B *const r = dynamic_cast<B*>(p);
+  // CHECK-NOT: call void @__cxa_bad_cast()
+  // CHECK-NOT: store {{.*}} @_ZN5test6L1rE
+
+  // This can throw, so we need to emit it.
+  const std::type_info *const s = &typeid(*p);
+  // CHECK: store {{.*}} @_ZN5test6L1sE
+
+  // This can't throw, so we don't.
+  const std::type_info *const t = &typeid(p);
+  // CHECK-NOT: @_ZN5test6L1tE
+
+  extern B *volatile v;
+  // CHECK: store {{.*}} @_ZN5test6L1wE
+  B *const w = dynamic_cast<B*>(v);
+
+  // CHECK: load volatile
+  // CHECK: store {{.*}} @_ZN5test6L1xE
+  const int x = *(volatile int*)0x1234;
+
+  namespace {
+    int a = int();
+    volatile int b = int();
+    int c = a;
+    int d = b;
+    // CHECK-NOT: store {{.*}} @_ZN5test6{{[A-Za-z0-9_]*}}1aE
+    // CHECK-NOT: store {{.*}} @_ZN5test6{{[A-Za-z0-9_]*}}1bE
+    // CHECK-NOT: store {{.*}} @_ZN5test6{{[A-Za-z0-9_]*}}1cE
+    // CHECK: load volatile {{.*}} @_ZN5test6{{[A-Za-z0-9_]*}}1bE
+    // CHECK: store {{.*}} @_ZN5test6{{[A-Za-z0-9_]*}}1dE
+  }
+}
+
+namespace test7 {
+  struct A { A(); };
+  struct B { ~B(); int n; };
+  struct C { C() = default; C(const C&); int n; };
+  struct D {};
+
+  // CHECK: call void @_ZN5test71AC1Ev({{.*}}@_ZN5test7L1aE)
+  const A a = A();
+
+  // CHECK: call i32 @__cxa_atexit({{.*}} @_ZN5test71BD1Ev{{.*}} @_ZN5test7L2b1E
+  // CHECK: call i32 @__cxa_atexit({{.*}} @_ZN5test71BD1Ev{{.*}} @_ZGRN5test72b2E
+  // CHECK: call void @_ZN5test71BD1Ev(
+  // CHECK: store {{.*}} @_ZN5test7L2b3E
+  const B b1 = B();
+  const B &b2 = B();
+  const int b3 = B().n;
+
+  // CHECK-NOT: @_ZN5test7L2c1E
+  // CHECK: call void @llvm.memset{{.*}} @_ZN5test7L2c1E
+  // CHECK-NOT: @_ZN5test7L2c1E
+  // CHECK: @_ZN5test7L2c2E
+  // CHECK-NOT: @_ZN5test7L2c3E
+  // CHECK: @_ZN5test7L2c4E
+  const C c1 = C();
+  const C c2 = static_cast<const C&>(C());
+  const int c3 = C().n;
+  const int c4 = C(C()).n;
+
+  // CHECK-NOT: @_ZN5test7L1dE
+  const D d = D();
+
+  // CHECK: store {{.*}} @_ZN5test71eE
+  int f(), e = f();
+}
+
+
+// At the end of the file, we check that y is initialized before z.
+
+// CHECK:      define internal void [[TEST1_Z_INIT:@.*]]()
+// CHECK:        load i32, i32* @_ZN5test1L1yE
+// CHECK-NEXT:   xor
+// CHECK-NEXT:   store i32 {{.*}}, i32* @_ZN5test1L1zE
+// CHECK:      define internal void [[TEST1_Y_INIT:@.*]]()
+// CHECK:        load i32, i32* @_ZN5test1L1xE
+// CHECK-NEXT:   sub
+// CHECK-NEXT:   store i32 {{.*}}, i32* @_ZN5test1L1yE
+
+// CHECK: define internal void @_GLOBAL__sub_I_global_init.cpp() #{{[0-9]+}} section "__TEXT,__StaticInit,regular,pure_instructions" {
+// CHECK:   call void [[TEST1_Y_INIT]]
+// CHECK:   call void [[TEST1_Z_INIT]]
+
+// rdar://problem/8090834: this should be nounwind
+// CHECK-NOEXC: define internal void @_GLOBAL__sub_I_global_init.cpp() [[NUW:#[0-9]+]] section "__TEXT,__StaticInit,regular,pure_instructions" {
+// CHECK-NOEXC: attributes [[NUW]] = { noinline nounwind{{.*}} }
+
+// Make sure we mark global initializers with the no-builtins attribute.
+// CHECK-NOBUILTIN: define internal void @_GLOBAL__sub_I_global_init.cpp() [[NUW:#[0-9]+]] section "__TEXT,__StaticInit,regular,pure_instructions" {
+// CHECK-NOBUILTIN: attributes [[NUW]] = { noinline nounwind{{.*}}"no-builtins"{{.*}} }
+
+// PR21811: attach the appropriate attribute to the global init function
+// CHECK-FP: define internal void @_GLOBAL__sub_I_global_init.cpp() [[NUX:#[0-9]+]] section "__TEXT,__StaticInit,regular,pure_instructions" {
+// CHECK-FP: attributes [[NUX]] = { noinline nounwind {{.*}}"frame-pointer"="non-leaf"{{.*}} }