Add the clang library to the repo (with some of my changes, too).

1 files changed, 112 insertions, 0 deletions

diff --git a/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
new file mode 100644
index 0000000..fd17d35
--- /dev/null
+++ b/clang/test/CXX/dcl.dcl/dcl.spec/dcl.constexpr/p5.cpp
@@ -0,0 +1,112 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -fcxx-exceptions %s
+// RUN: %clang_cc1 -fsyntax-only -std=c++11 -fcxx-exceptions -Wno-invalid-constexpr %s
+
+namespace StdExample {
+
+constexpr int f(void *) { return 0; }
+constexpr int f(...) { return 1; }
+constexpr int g1() { return f(0); }
+constexpr int g2(int n) { return f(n); }
+constexpr int g3(int n) { return f(n*0); }
+
+namespace N {
+  constexpr int c = 5;
+  constexpr int h() { return c; }
+}
+constexpr int c = 0;
+constexpr int g4() { return N::h(); }
+
+static_assert(f(0) == 0, "");
+static_assert(f('0') == 1, "");
+static_assert(g1() == 0, "");
+static_assert(g2(0) == 1, "");
+static_assert(g2(1) == 1, "");
+static_assert(g3(0) == 1, "");
+static_assert(g3(1) == 1, "");
+static_assert(N::h() == 5, "");
+static_assert(g4() == 5, "");
+
+
+constexpr int f(bool b)
+  { return b ? throw 0 : 0; } // ok
+constexpr int f() { return throw 0, 0; } // expected-error {{constexpr function never produces a constant expression}} expected-note {{subexpression}}
+
+struct B {
+  constexpr B(int x) : i(0) { }
+  int i;
+};
+
+int global; // expected-note {{declared here}}
+
+struct D : B {
+  constexpr D() : B(global) { } // expected-error {{constexpr constructor never produces a constant expression}} expected-note {{read of non-const}}
+};
+
+}
+
+namespace PotentialConstant {
+
+constexpr int Comma(int n) { return // expected-error {{constexpr function never produces a constant expression}}
+  (void)(n * 2),
+  throw 0, // expected-note {{subexpression}}
+  0;
+}
+
+int ng; // expected-note 6{{here}}
+constexpr int BinaryOp1(int n) { return n + ng; } // expected-error {{never produces}} expected-note {{read}}
+constexpr int BinaryOp2(int n) { return ng + n; } // expected-error {{never produces}} expected-note {{read}}
+
+double dg; // expected-note 2{{here}}
+constexpr double BinaryOp1(double d) { return d + dg; } // expected-error {{never produces}} expected-note {{read}}
+constexpr double BinaryOp2(double d) { return dg + d; } // expected-error {{never produces}} expected-note {{read}}
+
+constexpr int Add(int a, int b, int c) { return a + b + c; }
+constexpr int FunctionArgs(int a) { return Add(a, ng, a); } // expected-error {{never produces}} expected-note {{read}}
+
+struct S { int a; int b; int c[2]; };
+constexpr S InitList(int a) { return { a, ng }; }; // expected-error {{never produces}} expected-note {{read}}
+constexpr S InitList1a(int a) { return S{ a, ng }; }; // expected-error {{never produces}} expected-note {{read}}
+constexpr S InitList2(int a) { return { a, a, { ng } }; }; // expected-error {{never produces}} expected-note {{read}}
+constexpr S InitList3(int a) { return a ? S{ a, a } : S{ a, ng }; }; // ok
+
+constexpr int LogicalAnd1(int n) { return n && (throw, 0); } // ok
+constexpr int LogicalAnd2(int n) { return 1 && (throw, 0); } // expected-error {{never produces}} expected-note {{subexpression}}
+
+constexpr int LogicalOr1(int n) { return n || (throw, 0); } // ok
+constexpr int LogicalOr2(int n) { return 0 || (throw, 0); } // expected-error {{never produces}} expected-note {{subexpression}}
+
+constexpr int Conditional1(bool b, int n) { return b ? n : ng; } // ok
+constexpr int Conditional2(bool b, int n) { return b ? n * ng : n + ng; } // expected-error {{never produces}} expected-note {{both arms of conditional operator are unable to produce a constant expression}}
+
+// __builtin_constant_p ? : is magical, and is always a potential constant.
+constexpr bool BcpCall(int n) {
+  return __builtin_constant_p((int*)n != &n) ? (int*)n != &n : (int*)n != &n;
+}
+static_assert(BcpCall(0), "");
+
+// DR1311: A function template which can produce a constant expression, but
+// for which a particular specialization cannot, is ok.
+template<typename T> constexpr T cmin(T a, T b) {
+  return a < b ? a : b;
+}
+int n = cmin(3, 5); // ok
+
+struct X {
+  constexpr X() {}
+  bool operator<(X); // not constexpr
+};
+
+X x = cmin(X(), X()); // ok, not constexpr
+
+// Same with other temploids.
+template<typename T>
+struct Y {
+  constexpr Y() {}
+  constexpr int get() { return T(); }
+};
+struct Z { operator int(); };
+
+int y1 = Y<int>().get(); // ok
+int y2 = Y<Z>().get(); // ok
+
+}