1 files changed, 102 insertions, 0 deletions
diff --git a/clang/test/SemaCXX/constexpr-printing.cpp b/clang/test/SemaCXX/constexpr-printing.cpp
new file mode 100644
index 0000000..9170fa1
--- /dev/null
+++ b/clang/test/SemaCXX/constexpr-printing.cpp
@@ -0,0 +1,102 @@
+// RUN: %clang_cc1 %s -std=c++11 -fsyntax-only -verify -triple x86_64-linux-gnu
+
+struct S;
+constexpr int extract(const S &s);
+
+struct S {
+  constexpr S() : n(extract(*this)), m(0) {} // expected-note {{in call to 'extract(s1)'}}
+  constexpr S(int k) : n(k), m(extract(*this)) {}
+  int n, m;
+};
+
+constexpr int extract(const S &s) { return s.n; } // expected-note {{read of uninitialized object is not allowed in a constant expression}}
+
+constexpr S s1; // ok
+void f() {
+  constexpr S s1; // expected-error {{constant expression}} expected-note {{in call to 'S()'}}
+  constexpr S s2(10);
+}
+
+typedef __attribute__((vector_size(16))) int vector_int;
+
+struct T {
+  constexpr T() : arr() {}
+  int arr[4];
+};
+struct U : T {
+  constexpr U(const int *p) : T(), another(), p(p) {}
+  constexpr U(const U &u) : T(), another(), p(u.p) {}
+  T another;
+  const int *p;
+};
+constexpr U u1(&u1.arr[2]);
+
+constexpr int test_printing(int a, float b, _Complex int c, _Complex float d,
+                            int *e, int &f, vector_int g, U h) {
+  return *e; // expected-note {{read of non-constexpr variable 'u2'}}
+}
+U u2(0); // expected-note {{here}}
+static_assert(test_printing(12, 39.762, 3 + 4i, 12.9 + 3.6i, &u2.arr[4], u2.another.arr[2], (vector_int){5, 1, 2, 3}, u1) == 0, ""); // \
+expected-error {{constant expression}} \
+expected-note {{in call to 'test_printing(12, 3.976200e+01, 3+4i, 1.290000e+01+3.600000e+00i, &u2.T::arr[4], u2.another.arr[2], {5, 1, 2, 3}, {{{}}, {{}}, &u1.T::arr[2]})'}}
+
+struct V {
+  // FIXME: when we can generate these as constexpr constructors, remove the
+  // explicit definitions.
+  constexpr V() : arr{[255] = 42} {}
+  constexpr V(const V &v) : arr{[255] = 42} {}
+  int arr[256];
+};
+constexpr V v;
+constexpr int get(const int *p) { return *p; } // expected-note {{read of dereferenced one-past-the-end pointer}}
+constexpr int passLargeArray(V v) { return get(v.arr+256); } // expected-note {{in call to 'get(&v.arr[256])'}}
+static_assert(passLargeArray(v) == 0, ""); // expected-error {{constant expression}} expected-note {{in call to 'passLargeArray({{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...}})'}}
+
+union Union {
+  constexpr Union(int n) : b(n) {}
+  constexpr Union(const Union &u) : b(u.b) {}
+  int a, b;
+};
+constexpr Union myUnion = 76;
+
+constexpr int badness(Union u) { return u.a + u.b; } // expected-note {{read of member 'a' of union with active member 'b'}}
+static_assert(badness(myUnion), ""); // expected-error {{constant expression}} \
+        expected-note {{in call to 'badness({.b = 76})'}}
+
+struct MemPtrTest {
+  int n;
+  void f();
+};
+MemPtrTest mpt; // expected-note {{here}}
+constexpr int MemPtr(int (MemPtrTest::*a), void (MemPtrTest::*b)(), int &c) {
+  return c; // expected-note {{read of non-constexpr variable 'mpt'}}
+}
+static_assert(MemPtr(&MemPtrTest::n, &MemPtrTest::f, mpt.*&MemPtrTest::n), ""); // expected-error {{constant expression}} \
+expected-note {{in call to 'MemPtr(&MemPtrTest::n, &MemPtrTest::f, mpt.n)'}}
+
+template<typename CharT>
+constexpr CharT get(const CharT *p) { return p[-1]; } // expected-note 5{{}}
+
+constexpr char c = get("test\0\\\"\t\a\b\234"); // \
+  expected-error {{}} expected-note {{"test\000\\\"\t\a\b\234"}}
+constexpr char c8 = get(u8"test\0\\\"\t\a\b\234"); // \
+  expected-error {{}} expected-note {{u8"test\000\\\"\t\a\b\234"}}
+constexpr char16_t c16 = get(u"test\0\\\"\t\a\b\234\u1234"); // \
+  expected-error {{}} expected-note {{u"test\000\\\"\t\a\b\234\u1234"}}
+constexpr char32_t c32 = get(U"test\0\\\"\t\a\b\234\u1234\U0010ffff"); // \
+  expected-error {{}} expected-note {{U"test\000\\\"\t\a\b\234\u1234\U0010FFFF"}}
+constexpr wchar_t wc = get(L"test\0\\\"\t\a\b\234\u1234\xffffffff"); // \
+  expected-error {{}} expected-note {{L"test\000\\\"\t\a\b\234\x1234\xFFFFFFFF"}}
+
+constexpr char32_t c32_err = get(U"\U00110000"); // expected-error {{invalid universal character}}
+
+typedef decltype(sizeof(int)) LabelDiffTy;
+constexpr LabelDiffTy mulBy3(LabelDiffTy x) { return x * 3; } // expected-note {{subexpression}}
+void LabelDiffTest() {
+  static_assert(mulBy3((LabelDiffTy)&&a-(LabelDiffTy)&&b) == 3, ""); // expected-error {{constant expression}} expected-note {{call to 'mulBy3(&&a - &&b)'}}
+  a:b:return;
+}
+
+constexpr bool test_bool_printing(bool b) { return 1 / !(2*b | !(2*b)); } // expected-note 2{{division by zero}}
+constexpr bool test_bool_0 = test_bool_printing(false); // expected-error {{constant expr}} expected-note {{in call to 'test_bool_printing(false)'}}
+constexpr bool test_bool_1 = test_bool_printing(true); // expected-error {{constant expr}} expected-note {{in call to 'test_bool_printing(true)'}}