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[clang] Add some CodeGen tests for CWG 4xx issues (#83715)
This patch covers the following defect reports: [CWG438](https://cplusplus.github.io/CWG/issues/438.html) "Possible flaw in wording for multiple accesses to object between sequence points", [CWG439](https://cplusplus.github.io/CWG/issues/439.html) "Guarantees on casting pointer back to cv-qualified version of original type", [CWG441](https://cplusplus.github.io/CWG/issues/441.html) "Ordering of static reference initialization", [CWG462](https://cplusplus.github.io/CWG/issues/462.html) "Lifetime of temporaries bound to comma expressions", [CWG492](https://cplusplus.github.io/CWG/issues/492.html) "`typeid` constness inconsistent with example". [CWG475](https://cplusplus.github.io/CWG/issues/475.html) "When is `std::uncaught_exception()` true? (take 2)" requires a libc++abi test. As for [CWG454](https://cplusplus.github.io/CWG/issues/454.html) "When is a definition of a static data member required?", I don't feel confident in my understanding of it, so skipping over it.
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‎clang/test/CXX/drs/dr438.cpp‎

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// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++11 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++14 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++17 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++20 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++23 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++2c %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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namespace dr438 { // dr438: 2.7
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void f() {
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long A[2];
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A[0] = 0;
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A[A[0]] = 1;
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}
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} // namespace dr438
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// CHECK-LABEL: define {{.*}} void @dr438::f()()
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// CHECK: [[A:%.+]] = alloca [2 x i64]
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// CHECK: {{.+}} = getelementptr inbounds [2 x i64], ptr [[A]], i64 0, i64 0
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// CHECK: [[ARRAYIDX1:%.+]] = getelementptr inbounds [2 x i64], ptr [[A]], i64 0, i64 0
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// CHECK-NEXT: [[TEMPIDX:%.+]] = load i64, ptr [[ARRAYIDX1]]
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// CHECK-NEXT: [[ARRAYIDX2:%.+]] = getelementptr inbounds [2 x i64], ptr [[A]], i64 0, i64 [[TEMPIDX]]
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// CHECK-LABEL: }

‎clang/test/CXX/drs/dr439.cpp‎

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// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++11 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++14 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++17 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++20 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++23 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++2c %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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namespace dr439 { // dr439: 2.7
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void f() {
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int* p1 = new int;
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const int* p2 = static_cast<const int*>(static_cast<void *>(p1));
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bool b = p1 == p2; // b will have the value true.
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}
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} // namespace dr439
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// We're checking that p2 was copied from p1, and then was carried over
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// to the comparison without change.
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// CHECK-LABEL: define {{.*}} void @dr439::f()()
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// CHECK: [[P1:%.+]] = alloca ptr, align 8
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// CHECK-NEXT: [[P2:%.+]] = alloca ptr, align 8
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// CHECK: [[TEMP0:%.+]] = load ptr, ptr [[P1]]
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// CHECK-NEXT: store ptr [[TEMP0:%.+]], ptr [[P2]]
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// CHECK-NEXT: [[TEMP1:%.+]] = load ptr, ptr [[P1]]
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// CHECK-NEXT: [[TEMP2:%.+]] = load ptr, ptr [[P2]]
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// CHECK-NEXT: {{.*}} = icmp eq ptr [[TEMP1]], [[TEMP2]]
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// CHECK-LABEL: }

‎clang/test/CXX/drs/dr441.cpp‎

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// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++11 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++14 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++17 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++20 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++23 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++2c %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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namespace dr441 { // dr441: 2.7
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struct A {
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A() {}
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};
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A dynamic_init;
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int i;
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int& ir = i;
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int* ip = &i;
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} // namespace dr441
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// CHECK-DAG: @dr441::dynamic_init = global %"struct.dr441::A" zeroinitializer
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// CHECK-DAG: @dr441::i = global i32 0
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// CHECK-DAG: @dr441::ir = constant ptr @dr441::i
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// CHECK-DAG: @dr441::ip = global ptr @dr441::i
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// CHECK-DAG: @llvm.global_ctors = appending global [{{.+}}] [{ {{.+}} } { {{.+}}, ptr @_GLOBAL__sub_I_dr441.cpp, {{.+}} }]
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// CHECK-LABEL: define {{.*}} void @__cxx_global_var_init()
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// CHECK-NEXT: entry:
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// CHECK-NEXT: call void @dr441::A::A()({{.*}} @dr441::dynamic_init)
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// CHECK-NEXT: ret void
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// CHECK-NEXT: }
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// CHECK-LABEL: define {{.*}} void @_GLOBAL__sub_I_dr441.cpp()
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// CHECK-NEXT: entry:
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// CHECK-NEXT: call void @__cxx_global_var_init()
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// CHECK-NEXT: ret void
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// CHECK-NEXT: }

‎clang/test/CXX/drs/dr462.cpp‎

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// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++11 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++14 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++17 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++20 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++23 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++2c %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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#if __cplusplus == 199711L
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#define NOTHROW throw()
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#else
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#define NOTHROW noexcept(true)
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#endif
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namespace dr462 { // dr462: 2.7
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struct A {
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~A() NOTHROW {}
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};
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extern void full_expr_fence() NOTHROW;
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void f() {
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const A& r = (3, A());
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full_expr_fence();
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}
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} // namespace dr462
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// CHECK-LABEL: define {{.*}} void @dr462::f()()
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// CHECK: call void @dr462::full_expr_fence()()
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// CHECK: call void @dr462::A::~A()
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// CHECK-LABEL: }

‎clang/test/CXX/drs/dr492.cpp‎

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// RUN: %clang_cc1 -std=c++98 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++11 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++14 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++17 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++20 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++23 %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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// RUN: %clang_cc1 -std=c++2c %s -triple x86_64-linux-gnu -emit-llvm -o - -fexceptions -fcxx-exceptions -pedantic-errors | llvm-cxxfilt -n | FileCheck %s --check-prefixes CHECK
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#if __cplusplus == 199711L
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#define NOTHROW throw()
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#else
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#define NOTHROW noexcept(true)
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#endif
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namespace std {
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struct type_info {
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const char* name() const NOTHROW;
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};
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}
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namespace dr492 { // dr492: 2.7
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void f() {
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typeid(int).name();
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typeid(const int).name();
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typeid(volatile int).name();
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typeid(const volatile int).name();
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}
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} // namespace dr492
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// CHECK-LABEL: define {{.*}} void @dr492::f()()
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// CHECK: {{.*}} = call {{.*}} @std::type_info::name() const({{.*}} @typeinfo for int)
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// CHECK-NEXT: {{.*}} = call {{.*}} @std::type_info::name() const({{.*}} @typeinfo for int)
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// CHECK-NEXT: {{.*}} = call {{.*}} @std::type_info::name() const({{.*}} @typeinfo for int)
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// CHECK-NEXT: {{.*}} = call {{.*}} @std::type_info::name() const({{.*}} @typeinfo for int)
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// CHECK-LABEL: }

‎clang/test/CXX/drs/dr4xx.cpp‎

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@@ -698,9 +698,9 @@ namespace dr437 { // dr437: sup 1308
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};
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}
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701-
// dr438 FIXME write a codegen test
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// dr439 FIXME write a codegen test
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// dr441 FIXME write a codegen test
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// dr438 is in dr438.cpp
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// dr439 is in dr439.cpp
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// dr441 is in dr441.cpp
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// dr442: sup 348
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// dr443: na
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@@ -943,7 +943,7 @@ namespace dr460 { // dr460: yes
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}
944944

945945
// dr461: na
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// dr462 FIXME write a codegen test
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// dr462 is in dr462.cpp
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// dr463: na
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// dr464: na
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// dr465: na
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}
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}
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// dr475 FIXME write a codegen test
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// dr475 FIXME write a libc++abi test
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namespace dr477 { // dr477: 3.5
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struct A {
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// expected-error@-1 {{excess elements in array initializer}}
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}
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// dr492 FIXME write a codegen test
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// dr492 is in dr492.cpp
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namespace dr493 { // dr493: dup 976
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struct X {

‎clang/www/cxx_dr_status.html‎

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@@ -2668,13 +2668,13 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
26682668
<td><a href="https://cplusplus.github.io/CWG/issues/438.html">438</a></td>
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<td>CD2</td>
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<td>Possible flaw in wording for multiple accesses to object between sequence points</td>
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<td class="unknown" align="center">Unknown</td>
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<td class="full" align="center">Clang 2.7</td>
26722672
</tr>
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<tr id="439">
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<td><a href="https://cplusplus.github.io/CWG/issues/439.html">439</a></td>
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<td>CD1</td>
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<td>Guarantees on casting pointer back to cv-qualified version of original type</td>
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<td class="unknown" align="center">Unknown</td>
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<td class="full" align="center">Clang 2.7</td>
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</tr>
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<tr id="440">
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<td><a href="https://cplusplus.github.io/CWG/issues/440.html">440</a></td>
@@ -2686,7 +2686,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
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<td><a href="https://cplusplus.github.io/CWG/issues/441.html">441</a></td>
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<td>CD1</td>
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<td>Ordering of static reference initialization</td>
2689-
<td class="unknown" align="center">Unknown</td>
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<td class="full" align="center">Clang 2.7</td>
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</tr>
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<tr id="442">
26922692
<td><a href="https://cplusplus.github.io/CWG/issues/442.html">442</a></td>
@@ -2812,7 +2812,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
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<td><a href="https://cplusplus.github.io/CWG/issues/462.html">462</a></td>
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<td>CD3</td>
28142814
<td>Lifetime of temporaries bound to comma expressions</td>
2815-
<td class="unknown" align="center">Unknown</td>
2815+
<td class="full" align="center">Clang 2.7</td>
28162816
</tr>
28172817
<tr id="463">
28182818
<td><a href="https://cplusplus.github.io/CWG/issues/463.html">463</a></td>
@@ -2992,7 +2992,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
29922992
<td><a href="https://cplusplus.github.io/CWG/issues/492.html">492</a></td>
29932993
<td>CD1</td>
29942994
<td><TT>typeid</TT> constness inconsistent with example</td>
2995-
<td class="unknown" align="center">Unknown</td>
2995+
<td class="full" align="center">Clang 2.7</td>
29962996
</tr>
29972997
<tr id="493">
29982998
<td><a href="https://cplusplus.github.io/CWG/issues/493.html">493</a></td>

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