================
@@ -0,0 +1,113 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 -triple
x86_64-unknown-unknown %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++14 -triple
x86_64-unknown-unknown %s -fexperimental-new-constant-interpreter
+
+constexpr bool test_constexpr_valid() {
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(arr, 40);
+ return true;
+}
+static_assert(test_constexpr_valid(), "");
+
+constexpr bool test_constexpr_partial() {
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(&arr[5], 20);
+ return true;
+}
+static_assert(test_constexpr_partial(), "");
+
+constexpr bool test_constexpr_nullptr() { // expected-error {{constexpr
function never produces a constant expression}}
+ __builtin_assume_dereferenceable(nullptr, 4); // expected-note 2{{read of
dereferenced null pointer is not allowed in a constant expression}}
+ return true;
+}
+static_assert(test_constexpr_nullptr(), ""); // expected-error {{not an
integral constant expression}} expected-note {{in call to}}
+
+constexpr bool test_constexpr_too_large() { // expected-error {{constexpr
function never produces a constant expression}}
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(arr, 100); // expected-note 2{{read of
dereferenced one-past-the-end pointer is not allowed in a constant expression}}
+ return true;
+}
+static_assert(test_constexpr_too_large(), ""); // expected-error {{not an
integral constant expression}} expected-note {{in call to}}
+
+constexpr bool test_single_var() {
+ constexpr int single_var = 42;
+ __builtin_assume_dereferenceable(&single_var, 4);
+ return true;
+}
+static_assert(test_single_var(), "");
+
+constexpr bool test_exact_boundary() {
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(&arr[9], 4);
+ return true;
+}
+static_assert(test_exact_boundary(), "");
+
+constexpr bool test_one_over() { // expected-error {{constexpr function never
produces a constant expression}}
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(&arr[9], 5); // expected-note 2{{read of
dereferenced one-past-the-end pointer is not allowed in a constant expression}}
+ return true;
+}
+static_assert(test_one_over(), ""); // expected-error {{not an integral
constant expression}} expected-note {{in call to}}
+
+constexpr bool test_zero_size() {
+ constexpr int arr[10] = {};
+ __builtin_assume_dereferenceable(arr, 0);
+ return true;
+}
+static_assert(test_zero_size(), "");
+
+constexpr bool test_struct_member() {
+ struct S {
+ int x;
+ int y;
+ };
+ constexpr S s = {1, 2};
+ __builtin_assume_dereferenceable(&s.x, 4);
+ return true;
+}
+static_assert(test_struct_member(), "");
+
+constexpr bool test_range_valid() {
+ constexpr int range_data[5] = {1, 2, 3, 4, 5};
+ __builtin_assume_dereferenceable(range_data, 5 * sizeof(int));
+ return range_data[0] == 1;
+}
+static_assert(test_range_valid(), "");
+
+constexpr bool test_range_invalid() { // expected-error {{constexpr function
never produces a constant expression}}
+ constexpr int range_data[5] = {1, 2, 3, 4, 5};
+ __builtin_assume_dereferenceable(range_data, 6 * sizeof(int)); //
expected-note 2{{read of dereferenced one-past-the-end pointer is not allowed
in a constant expression}}
+ return true;
+}
+static_assert(test_range_invalid(), ""); // expected-error {{not an integral
constant expression}} expected-note {{in call to}}
+
+constexpr int arr1[10] = {};
+constexpr int valid = (__builtin_assume_dereferenceable(arr1, 40), 12);
+
+constexpr int invalid = (__builtin_assume_dereferenceable((int*)123, 4), 12);
// expected-error {{constexpr variable 'invalid' must be initialized by a
constant expression}} expected-note {{cast that performs the conversions of a
reinterpret_cast is not allowed in a constant expression}}
+
+constexpr int arr2[5] = {1, 2, 3, 4, 5};
+constexpr int too_large = (__builtin_assume_dereferenceable(arr2, 6 *
sizeof(int)), 12); // expected-error {{constexpr variable 'too_large' must be
initialized by a constant expression}} expected-note {{read of dereferenced
one-past-the-end pointer is not allowed in a constant expression}}
+
+constexpr int null = (__builtin_assume_dereferenceable(nullptr, 4), 12); //
expected-error {{constexpr variable 'null' must be initialized by a constant
expression}} expected-note {{read of dereferenced null pointer is not allowed
in a constant expression}}
+
+int b = 10;
+const int f = (__builtin_assume_dereferenceable((char*)&b + 1, 3), 12);
+int a = f;
----------------
tbaederr wrote:
This doesn't test anything, the tests would work if the builtin worked or
failed... You'd have to test the LLVM IR generated.
https://github.com/llvm/llvm-project/pull/169869
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