Revert r144273. It causes clang self-host build failure.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144296 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/ExprConstant.cpp

@@ -1029,9 +1029,8 @@ static bool EvaluateArgs(ArrayRef<const Expr*> Args, ArgVector &ArgValues,
 }
 
 /// Evaluate a function call.
-static bool HandleFunctionCall(const LValue *This, ArrayRef<const Expr*> Args,
+static bool HandleFunctionCall(ArrayRef<const Expr*> Args, const Stmt *Body,
-                               const Stmt *Body, EvalInfo &Info,
+                               EvalInfo &Info, CCValue &Result) {
-                               CCValue &Result) {
   // FIXME: Implement a proper call limit, along with a command-line flag.
   if (Info.NumCalls >= 1000000 || Info.CallStackDepth >= 512)
     return false;
@@ -1040,15 +1039,16 @@ static bool HandleFunctionCall(const LValue *This, ArrayRef<const Expr*> Args,
   if (!EvaluateArgs(Args, ArgValues, Info))
     return false;
 
+  // FIXME: Pass in 'this' for member functions.
+  const LValue *This = 0;
   CallStackFrame Frame(Info, This, ArgValues.data());
   return EvaluateStmt(Result, Info, Body) == ESR_Returned;
 }
 
 /// Evaluate a constructor call.
-static bool HandleConstructorCall(const LValue &This,
+static bool HandleConstructorCall(ArrayRef<const Expr*> Args,
-                                  ArrayRef<const Expr*> Args,
                                   const CXXConstructorDecl *Definition,
-                                  EvalInfo &Info,
+                                  EvalInfo &Info, const LValue &This,
                                   APValue &Result) {
   if (Info.NumCalls >= 1000000 || Info.CallStackDepth >= 512)
     return false;
@@ -1305,64 +1305,39 @@ public:
     const Expr *Callee = E->getCallee();
     QualType CalleeType = Callee->getType();
 
+    // FIXME: Handle the case where Callee is a (parenthesized) MemberExpr for a
+    // non-static member function.
+    if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember))
+      return DerivedError(E);
+
+    if (!CalleeType->isFunctionType() && !CalleeType->isFunctionPointerType())
+      return DerivedError(E);
+
+    CCValue Call;
+    if (!Evaluate(Call, Info, Callee) || !Call.isLValue() ||
+        !Call.getLValueBase() || !Call.getLValueOffset().isZero())
+      return DerivedError(Callee);
+
     const FunctionDecl *FD = 0;
-    LValue *This = 0, ThisVal;
+    if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Call.getLValueBase()))
-    llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs());
+      FD = dyn_cast<FunctionDecl>(DRE->getDecl());
-
+    else if (const MemberExpr *ME = dyn_cast<MemberExpr>(Call.getLValueBase()))
-    // Extract function decl and 'this' pointer from the callee.
-    if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) {
-      const MemberExpr *ME = dyn_cast<MemberExpr>(Callee->IgnoreParens());
-      // FIXME: Handle a BinaryOperator callee ('.*' or '->*').
-      if (!ME)
-        return DerivedError(Callee);
-      if (ME->isArrow()) {
-        if (!EvaluatePointer(ME->getBase(), ThisVal, Info))
-          return DerivedError(ME);
-      } else {
-        if (!EvaluateLValue(ME->getBase(), ThisVal, Info))
-          return DerivedError(ME);
-      }
-      This = &ThisVal;
       FD = dyn_cast<FunctionDecl>(ME->getMemberDecl());
-      if (!FD)
+    if (!FD)
-        return DerivedError(ME);
+      return DerivedError(Callee);
-    } else if (CalleeType->isFunctionPointerType()) {
-      CCValue Call;
-      if (!Evaluate(Call, Info, Callee) || !Call.isLValue() ||
-          !Call.getLValueBase() || !Call.getLValueOffset().isZero())
-        return DerivedError(Callee);
 
-      const Expr *Base = Call.getLValueBase();
+    // Don't call function pointers which have been cast to some other type.
-
+    if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType()))
-      if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base))
+      return DerivedError(E);
-        FD = dyn_cast<FunctionDecl>(DRE->getDecl());
-      else if (const MemberExpr *ME = dyn_cast<MemberExpr>(Base))
-        FD = dyn_cast<FunctionDecl>(ME->getMemberDecl());
-      if (!FD)
-        return DerivedError(Callee);
-
-      // Overloaded operator calls to member functions are represented as normal
-      // calls with 'this' as the first argument.
-      const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
-      if (MD && !MD->isStatic()) {
-        if (!EvaluateLValue(Args[0], ThisVal, Info))
-          return DerivedError(Args[0]);
-        This = &ThisVal;
-        Args = Args.slice(1);
-      }
-
-      // Don't call function pointers which have been cast to some other type.
-      if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType()))
-        return DerivedError(E);
-    }
 
     const FunctionDecl *Definition;
     Stmt *Body = FD->getBody(Definition);
     CCValue CCResult;
     APValue Result;
+    llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs());
 
     if (Body && Definition->isConstexpr() && !Definition->isInvalidDecl() &&
-        HandleFunctionCall(This, Args, Body, Info, CCResult) &&
+        HandleFunctionCall(Args, Body, Info, CCResult) &&
         CheckConstantExpression(CCResult, Result))
       return DerivedSuccess(CCValue(Result, CCValue::GlobalValue()), E);
 
@@ -1915,8 +1890,8 @@ bool RecordExprEvaluator::VisitCXXConstructExpr(const CXXConstructExpr *E) {
       return Visit(ME->GetTemporaryExpr());
 
   llvm::ArrayRef<const Expr*> Args(E->getArgs(), E->getNumArgs());
-  return HandleConstructorCall(This, Args, cast<CXXConstructorDecl>(Definition),
+  return HandleConstructorCall(Args, cast<CXXConstructorDecl>(Definition),
-                               Info, Result);
+                               Info, This, Result);
 }
 
 static bool EvaluateRecord(const Expr *E, const LValue &This,

test/SemaCXX/constant-expression-cxx11.cpp

@@ -1,642 +0,0 @@
-// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 %s
-
-// This version of static_assert just requires a foldable value as the
-// expression, not an ICE.
-// FIXME: Once we implement the C++11 ICE rules, most uses of this here should
-// be converted to static_assert.
-#define static_assert_fold(expr, str) \
-    static_assert(__builtin_constant_p(expr), "not an integral constant expression"); \
-    static_assert(__builtin_constant_p(expr) ? expr : true, str)
-
-namespace StaticAssertFoldTest {
-
-int x;
-static_assert_fold(++x, "test"); // expected-error {{not an integral constant expression}}
-static_assert_fold(false, "test"); // expected-error {{test}}
-
-}
-
-// FIXME: support const T& parameters here.
-//template<typename T> constexpr T id(const T &t) { return t; }
-template<typename T> constexpr T id(T t) { return t; }
-// FIXME: support templates here.
-//template<typename T> constexpr T min(const T &a, const T &b) {
-//  return a < b ? a : b;
-//}
-//template<typename T> constexpr T max(const T &a, const T &b) {
-//  return a < b ? b : a;
-//}
-constexpr int min(const int &a, const int &b) { return a < b ? a : b; }
-constexpr int max(const int &a, const int &b) { return a < b ? b : a; }
-
-struct MemberZero {
-  constexpr int zero() { return 0; }
-};
-
-namespace DerivedToVBaseCast {
-
-  struct U { int n; };
-  struct V : U { int n; };
-  struct A : virtual V { int n; };
-  struct Aa { int n; };
-  struct B : virtual A, Aa {};
-  struct C : virtual A, Aa {};
-  struct D : B, C {};
-
-  D d;
-  constexpr B *p = &d;
-  constexpr C *q = &d;
-  static_assert_fold((void*)p != (void*)q, "");
-  static_assert_fold((A*)p == (A*)q, "");
-  static_assert_fold((Aa*)p != (Aa*)q, "");
-
-  constexpr B &pp = d;
-  constexpr C &qq = d;
-  static_assert_fold((void*)&pp != (void*)&qq, "");
-  static_assert_fold(&(A&)pp == &(A&)qq, "");
-  static_assert_fold(&(Aa&)pp != &(Aa&)qq, "");
-
-  constexpr V *v = p;
-  constexpr V *w = q;
-  constexpr V *x = (A*)p;
-  static_assert_fold(v == w, "");
-  static_assert_fold(v == x, "");
-
-  static_assert_fold((U*)&d == p, "");
-  static_assert_fold((U*)&d == q, "");
-  static_assert_fold((U*)&d == v, "");
-  static_assert_fold((U*)&d == w, "");
-  static_assert_fold((U*)&d == x, "");
-
-  struct X {};
-  struct Y1 : virtual X {};
-  struct Y2 : X {};
-  struct Z : Y1, Y2 {};
-  Z z;
-  static_assert_fold((X*)(Y1*)&z != (X*)(Y2*)&z, "");
-
-}
-
-namespace TemplateArgumentConversion {
-  template<int n> struct IntParam {};
-
-  using IntParam0 = IntParam<0>;
-  // FIXME: This should be accepted once we do constexpr function invocation.
-  using IntParam0 = IntParam<id(0)>; // expected-error {{not an integral constant expression}}
-  using IntParam0 = IntParam<MemberZero().zero>; // expected-error {{did you mean to call it with no arguments?}} expected-error {{not an integral constant expression}}
-}
-
-namespace CaseStatements {
-  void f(int n) {
-    switch (n) {
-    // FIXME: Produce the 'add ()' fixit for this.
-    case MemberZero().zero: // desired-error {{did you mean to call it with no arguments?}} expected-error {{not an integer constant expression}}
-    // FIXME: This should be accepted once we do constexpr function invocation.
-    case id(1): // expected-error {{not an integer constant expression}}
-      return;
-    }
-  }
-}
-
-extern int &Recurse1;
-int &Recurse2 = Recurse1, &Recurse1 = Recurse2;
-constexpr int &Recurse3 = Recurse2; // expected-error {{must be initialized by a constant expression}}
-
-namespace MemberEnum {
-  struct WithMemberEnum {
-    enum E { A = 42 };
-  } wme;
-
-  static_assert_fold(wme.A == 42, "");
-}
-
-namespace DefaultArguments {
-
-const int z = int();
-constexpr int Sum(int a = 0, const int &b = 0, const int *c = &z, char d = 0) {
-  return a + b + *c + d;
-}
-const int four = 4;
-constexpr int eight = 8;
-constexpr const int twentyseven = 27;
-static_assert_fold(Sum() == 0, "");
-static_assert_fold(Sum(1) == 1, "");
-static_assert_fold(Sum(1, four) == 5, "");
-static_assert_fold(Sum(1, eight, &twentyseven) == 36, "");
-static_assert_fold(Sum(1, 2, &four, eight) == 15, "");
-
-}
-
-namespace Ellipsis {
-
-// Note, values passed through an ellipsis can't actually be used.
-constexpr int F(int a, ...) { return a; }
-static_assert_fold(F(0) == 0, "");
-static_assert_fold(F(1, 0) == 1, "");
-static_assert_fold(F(2, "test") == 2, "");
-static_assert_fold(F(3, &F) == 3, "");
-int k = 0;
-static_assert_fold(F(4, k) == 3, ""); // expected-error {{constant expression}}
-
-}
-
-namespace Recursion {
-  constexpr int fib(int n) { return n > 1 ? fib(n-1) + fib(n-2) : n; }
-  static_assert_fold(fib(11) == 89, "");
-
-  constexpr int gcd_inner(int a, int b) {
-    return b == 0 ? a : gcd_inner(b, a % b);
-  }
-  constexpr int gcd(int a, int b) {
-    return gcd_inner(max(a, b), min(a, b));
-  }
-
-  static_assert_fold(gcd(1749237, 5628959) == 7, "");
-}
-
-namespace FunctionCast {
-  // When folding, we allow functions to be cast to different types. Such
-  // cast functions cannot be called, even if they're constexpr.
-  constexpr int f() { return 1; }
-  typedef double (*DoubleFn)();
-  typedef int (*IntFn)();
-  int a[(int)DoubleFn(f)()]; // expected-error {{variable length array}}
-  int b[(int)IntFn(f)()];    // ok
-}
-
-namespace StaticMemberFunction {
-  struct S {
-    static constexpr int k = 42;
-    static constexpr int f(int n) { return n * k + 2; }
-  } s;
-
-  constexpr int n = s.f(19);
-  static_assert_fold(S::f(19) == 800, "");
-  static_assert_fold(s.f(19) == 800, "");
-  static_assert_fold(n == 800, "");
-}
-
-namespace ParameterScopes {
-
-  const int k = 42;
-  constexpr const int &ObscureTheTruth(const int &a) { return a; }
-  constexpr const int &MaybeReturnJunk(bool b, const int a) {
-    return ObscureTheTruth(b ? a : k);
-  }
-  static_assert_fold(MaybeReturnJunk(false, 0) == 42, ""); // ok
-  constexpr int a = MaybeReturnJunk(true, 0); // expected-error {{constant expression}}
-
-  constexpr const int MaybeReturnNonstaticRef(bool b, const int a) {
-    // If ObscureTheTruth returns a reference to 'a', the result is not a
-    // constant expression even though 'a' is still in scope.
-    return ObscureTheTruth(b ? a : k);
-  }
-  static_assert_fold(MaybeReturnNonstaticRef(false, 0) == 42, ""); // ok
-  constexpr int b = MaybeReturnNonstaticRef(true, 0); // expected-error {{constant expression}}
-
-  constexpr int InternalReturnJunk(int n) {
-    // FIXME: We should reject this: it never produces a constant expression.
-    return MaybeReturnJunk(true, n);
-  }
-  constexpr int n3 = InternalReturnJunk(0); // expected-error {{must be initialized by a constant expression}}
-
-  constexpr int LToR(int &n) { return n; }
-  constexpr int GrabCallersArgument(bool which, int a, int b) {
-    return LToR(which ? b : a);
-  }
-  static_assert_fold(GrabCallersArgument(false, 1, 2) == 1, "");
-  static_assert_fold(GrabCallersArgument(true, 4, 8) == 8, "");
-
-}
-
-namespace Pointers {
-
-  constexpr int f(int n, const int *a, const int *b, const int *c) {
-    return n == 0 ? 0 : *a + f(n-1, b, c, a);
-  }
-
-  const int x = 1, y = 10, z = 100;
-  static_assert_fold(f(23, &x, &y, &z) == 788, "");
-
-  constexpr int g(int n, int a, int b, int c) {
-    return f(n, &a, &b, &c);
-  }
-  static_assert_fold(g(23, x, y, z) == 788, "");
-
-}
-
-namespace FunctionPointers {
-
-  constexpr int Double(int n) { return 2 * n; }
-  constexpr int Triple(int n) { return 3 * n; }
-  constexpr int Twice(int (*F)(int), int n) { return F(F(n)); }
-  constexpr int Quadruple(int n) { return Twice(Double, n); }
-  constexpr auto Select(int n) -> int (*)(int) {
-    return n == 2 ? &Double : n == 3 ? &Triple : n == 4 ? &Quadruple : 0;
-  }
-  constexpr int Apply(int (*F)(int), int n) { return F(n); }
-
-  static_assert_fold(1 + Apply(Select(4), 5) + Apply(Select(3), 7) == 42, "");
-
-  constexpr int Invalid = Apply(Select(0), 0); // expected-error {{must be initialized by a constant expression}}
-
-}
-
-namespace PointerComparison {
-
-int x, y;
-static_assert_fold(&x == &y, "false"); // expected-error {{false}}
-static_assert_fold(&x != &y, "");
-constexpr bool g1 = &x == &y;
-constexpr bool g2 = &x != &y;
-constexpr bool g3 = &x <= &y; // expected-error {{must be initialized by a constant expression}}
-constexpr bool g4 = &x >= &y; // expected-error {{must be initialized by a constant expression}}
-constexpr bool g5 = &x < &y; // expected-error {{must be initialized by a constant expression}}
-constexpr bool g6 = &x > &y; // expected-error {{must be initialized by a constant expression}}
-
-struct S { int x, y; } s;
-static_assert_fold(&s.x == &s.y, "false"); // expected-error {{false}}
-static_assert_fold(&s.x != &s.y, "");
-static_assert_fold(&s.x <= &s.y, "");
-static_assert_fold(&s.x >= &s.y, "false"); // expected-error {{false}}
-static_assert_fold(&s.x < &s.y, "");
-static_assert_fold(&s.x > &s.y, "false"); // expected-error {{false}}
-
-static_assert_fold(0 == &y, "false"); // expected-error {{false}}
-static_assert_fold(0 != &y, "");
-constexpr bool n3 = 0 <= &y; // expected-error {{must be initialized by a constant expression}}
-constexpr bool n4 = 0 >= &y; // expected-error {{must be initialized by a constant expression}}
-constexpr bool n5 = 0 < &y; // expected-error {{must be initialized by a constant expression}}
-constexpr bool n6 = 0 > &y; // expected-error {{must be initialized by a constant expression}}
-
-static_assert_fold(&x == 0, "false"); // expected-error {{false}}
-static_assert_fold(&x != 0, "");
-constexpr bool n9 = &x <= 0; // expected-error {{must be initialized by a constant expression}}
-constexpr bool n10 = &x >= 0; // expected-error {{must be initialized by a constant expression}}
-constexpr bool n11 = &x < 0; // expected-error {{must be initialized by a constant expression}}
-constexpr bool n12 = &x > 0; // expected-error {{must be initialized by a constant expression}}
-
-static_assert_fold(&x == &x, "");
-static_assert_fold(&x != &x, "false"); // expected-error {{false}}
-static_assert_fold(&x <= &x, "");
-static_assert_fold(&x >= &x, "");
-static_assert_fold(&x < &x, "false"); // expected-error {{false}}
-static_assert_fold(&x > &x, "false"); // expected-error {{false}}
-
-constexpr S* sptr = &s;
-// FIXME: This is not a constant expression; check we reject this and move this
-// test elsewhere.
-constexpr bool dyncast = sptr == dynamic_cast<S*>(sptr);
-
-extern char externalvar[];
-// FIXME: This is not a constant expression; check we reject this and move this
-// test elsewhere.
-constexpr bool constaddress = (void *)externalvar == (void *)0x4000UL;  // expected-error {{must be initialized by a constant expression}}
-constexpr bool litaddress = "foo" == "foo"; // expected-error {{must be initialized by a constant expression}} expected-warning {{unspecified}}
-static_assert_fold(0 != "foo", "");
-
-}
-
-namespace MaterializeTemporary {
-
-constexpr int f(const int &r) { return r; }
-constexpr int n = f(1);
-
-constexpr bool same(const int &a, const int &b) { return &a == &b; }
-constexpr bool sameTemporary(const int &n) { return same(n, n); }
-
-static_assert_fold(n, "");
-static_assert_fold(!same(4, 4), "");
-static_assert_fold(same(n, n), "");
-static_assert_fold(sameTemporary(9), "");
-
-}
-
-constexpr int strcmp_ce(const char *p, const char *q) {
-  return (!*p || *p != *q) ? *p - *q : strcmp_ce(p+1, q+1);
-}
-
-namespace StringLiteral {
-
-// FIXME: Refactor this once we support constexpr templates.
-constexpr int MangleChars(const char *p) {
-  return *p + 3 * (*p ? MangleChars(p+1) : 0);
-}
-constexpr int MangleChars(const char16_t *p) {
-  return *p + 3 * (*p ? MangleChars(p+1) : 0);
-}
-constexpr int MangleChars(const char32_t *p) {
-  return *p + 3 * (*p ? MangleChars(p+1) : 0);
-}
-
-static_assert_fold(MangleChars("constexpr!") == 1768383, "");
-static_assert_fold(MangleChars(u"constexpr!") == 1768383, "");
-static_assert_fold(MangleChars(U"constexpr!") == 1768383, "");
-
-constexpr char c0 = "nought index"[0];
-constexpr char c1 = "nice index"[10];
-constexpr char c2 = "nasty index"[12]; // expected-error {{must be initialized by a constant expression}} expected-warning {{indexes past the end}}
-constexpr char c3 = "negative index"[-1]; // expected-error {{must be initialized by a constant expression}} expected-warning {{indexes before the beginning}}
-constexpr char c4 = ((char*)(int*)"no reinterpret_casts allowed")[14]; // expected-error {{must be initialized by a constant expression}}
-
-constexpr const char *p = "test" + 2;
-static_assert_fold(*p == 's', "");
-
-constexpr const char *max_iter(const char *a, const char *b) {
-  return *a < *b ? b : a;
-}
-constexpr const char *max_element(const char *a, const char *b) {
-  return (a+1 >= b) ? a : max_iter(a, max_element(a+1, b));
-}
-
-constexpr const char *begin(const char (&arr)[45]) { return arr; }
-constexpr const char *end(const char (&arr)[45]) { return arr + 45; }
-
-constexpr char str[] = "the quick brown fox jumped over the lazy dog";
-constexpr const char *max = max_element(begin(str), end(str));
-static_assert_fold(*max == 'z', "");
-static_assert_fold(max == str + 38, "");
-
-static_assert_fold(strcmp_ce("hello world", "hello world") == 0, "");
-static_assert_fold(strcmp_ce("hello world", "hello clang") > 0, "");
-static_assert_fold(strcmp_ce("constexpr", "test") < 0, "");
-static_assert_fold(strcmp_ce("", " ") < 0, "");
-
-}
-
-namespace Array {
-
-// FIXME: Use templates for these once we support constexpr templates.
-constexpr int Sum(const int *begin, const int *end) {
-  return begin == end ? 0 : *begin + Sum(begin+1, end);
-}
-constexpr const int *begin(const int (&xs)[5]) { return xs; }
-constexpr const int *end(const int (&xs)[5]) { return xs + 5; }
-
-constexpr int xs[] = { 1, 2, 3, 4, 5 };
-constexpr int ys[] = { 5, 4, 3, 2, 1 };
-constexpr int sum_xs = Sum(begin(xs), end(xs));
-static_assert_fold(sum_xs == 15, "");
-
-constexpr int ZipFoldR(int (*F)(int x, int y, int c), int n,
-                       const int *xs, const int *ys, int c) {
-  return n ? F(*xs, *ys, ZipFoldR(F, n-1, xs+1, ys+1, c)) : c;
-}
-constexpr int MulAdd(int x, int y, int c) { return x * y + c; }
-constexpr int InnerProduct = ZipFoldR(MulAdd, 5, xs, ys, 0);
-static_assert_fold(InnerProduct == 35, "");
-
-constexpr int SubMul(int x, int y, int c) { return (x - y) * c; }
-constexpr int DiffProd = ZipFoldR(SubMul, 2, xs+3, ys+3, 1);
-static_assert_fold(DiffProd == 8, "");
-static_assert_fold(ZipFoldR(SubMul, 3, xs+3, ys+3, 1), ""); // expected-error {{constant expression}}
-
-constexpr const int *p = xs + 3;
-constexpr int xs4 = p[1]; // ok
-constexpr int xs5 = p[2]; // expected-error {{constant expression}}
-constexpr int xs0 = p[-3]; // ok
-constexpr int xs_1 = p[-4]; // expected-error {{constant expression}}
-
-constexpr int zs[2][2][2][2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
-static_assert_fold(zs[0][0][0][0] == 1, "");
-static_assert_fold(zs[1][1][1][1] == 16, "");
-static_assert_fold(zs[0][0][0][2] == 3, ""); // expected-error {{constant expression}}
-static_assert_fold((&zs[0][0][0][2])[-1] == 2, "");
-static_assert_fold(**(**(zs + 1) + 1) == 11, "");
-static_assert_fold(*(&(&(*(*&(&zs[2] - 1)[0] + 2 - 2))[2])[-1][-1] + 1) == 11, "");
-
-constexpr int arr[40] = { 1, 2, 3, [8] = 4 };
-constexpr int SumNonzero(const int *p) {
-  return *p + (*p ? SumNonzero(p+1) : 0);
-}
-constexpr int CountZero(const int *p, const int *q) {
-  return p == q ? 0 : (*p == 0) + CountZero(p+1, q);
-}
-static_assert_fold(SumNonzero(arr) == 6, "");
-static_assert_fold(CountZero(arr, arr + 40) == 36, "");
-
-}
-
-namespace DependentValues {
-
-struct I { int n; typedef I V[10]; };
-I::V x, y;
-template<bool B> struct S {
-  int k;
-  void f() {
-    I::V &cells = B ? x : y;
-    I &i = cells[k];
-    switch (i.n) {}
-  }
-};
-
-}
-
-namespace Class {
-
-struct A { constexpr A(int a, int b) : k(a + b) {} int k; };
-constexpr int fn(const A &a) { return a.k; }
-static_assert_fold(fn(A(4,5)) == 9, "");
-
-struct B { int n; int m; } constexpr b = { 0, b.n }; // expected-warning {{uninitialized}}
-struct C {
-  constexpr C(C *this_) : m(42), n(this_->m) {} // ok
-  int m, n;
-};
-struct D {
-  C c;
-  constexpr D() : c(&c) {}
-};
-static_assert_fold(D().c.n == 42, "");
-
-struct E {
-  constexpr E() : p(&p) {}
-  void *p;
-};
-constexpr const E &e1 = E(); // expected-error {{constant expression}}
-// This is a constant expression if we elide the copy constructor call, and
-// is not a constant expression if we don't! But we do, so it is.
-// FIXME: The move constructor is not currently implicitly defined as constexpr.
-// We notice this when evaluating an expression which uses it, but not when
-// checking its initializer.
-constexpr E e2 = E(); // unexpected-error {{constant expression}}
-static_assert_fold(e2.p == &e2.p, ""); // unexpected-error {{constant expression}}
-// FIXME: We don't pass through the fact that 'this' is ::e3 when checking the
-// initializer of this declaration.
-constexpr E e3; // unexpected-error {{constant expression}}
-static_assert_fold(e3.p == &e3.p, "");
-
-extern const class F f;
-struct F {
-  constexpr F() : p(&f.p) {}
-  const void *p;
-};
-constexpr F f = F();
-
-struct G {
-  struct T {
-    constexpr T(T *p) : u1(), u2(p) {}
-    union U1 {
-      constexpr U1() {}
-      int a, b = 42;
-    } u1;
-    union U2 {
-      constexpr U2(T *p) : c(p->u1.b) {}
-      int c, d;
-    } u2;
-  } t;
-  constexpr G() : t(&t) {}
-} constexpr g;
-
-static_assert_fold(g.t.u1.a == 42, ""); // expected-error {{constant expression}}
-static_assert_fold(g.t.u1.b == 42, "");
-static_assert_fold(g.t.u2.c == 42, "");
-static_assert_fold(g.t.u2.d == 42, ""); // expected-error {{constant expression}}
-
-struct S {
-  int a, b;
-  const S *p;
-  double d;
-  const char *q;
-
-  constexpr S(int n, const S *p) : a(5), b(n), p(p), d(n), q("hello") {}
-};
-
-S global(43, &global);
-
-static_assert_fold(S(15, &global).b == 15, "");
-
-constexpr bool CheckS(const S &s) {
-  return s.a == 5 && s.b == 27 && s.p == &global && s.d == 27. && s.q[3] == 'l';
-}
-static_assert_fold(CheckS(S(27, &global)), "");
-
-struct Arr {
-  char arr[3];
-  constexpr Arr() : arr{'x', 'y', 'z'} {}
-};
-constexpr int hash(Arr &&a) {
-  return a.arr[0] + a.arr[1] * 0x100 + a.arr[2] * 0x10000;
-}
-constexpr int k = hash(Arr());
-static_assert_fold(k == 0x007a7978, "");
-
-
-struct AggregateInit {
-  const char &c;
-  int n;
-  double d;
-  int arr[5];
-  void *p;
-};
-
-constexpr AggregateInit agg1 = { "hello"[0] };
-
-static_assert_fold(strcmp_ce(&agg1.c, "hello") == 0, "");
-static_assert_fold(agg1.n == 0, "");
-static_assert_fold(agg1.d == 0.0, "");
-static_assert_fold(agg1.arr[-1] == 0, ""); // expected-error {{constant expression}}
-static_assert_fold(agg1.arr[0] == 0, "");
-static_assert_fold(agg1.arr[4] == 0, "");
-static_assert_fold(agg1.arr[5] == 0, ""); // expected-error {{constant expression}}
-static_assert_fold(agg1.p == nullptr, "");
-
-namespace SimpleDerivedClass {
-
-struct B {
-  constexpr B(int n) : a(n) {}
-  int a;
-};
-struct D : B {
-  constexpr D(int n) : B(n) {}
-};
-constexpr D d(3);
-static_assert_fold(d.a == 3, "");
-
-}
-
-struct Base {
-  constexpr Base(int a = 42, const char *b = "test") : a(a), b(b) {}
-  int a;
-  const char *b;
-};
-struct Base2 {
-  constexpr Base2(const int &r) : r(r) {}
-  int q = 123;
-  // FIXME: When we track the global for which we are computing the initializer,
-  // use a reference here.
-  //const int &r;
-  int r;
-};
-struct Derived : Base, Base2 {
-  constexpr Derived() : Base(76), Base2(a) {}
-  int c = r + b[1];
-};
-
-constexpr bool operator==(const Base &a, const Base &b) {
-  return a.a == b.a && strcmp_ce(a.b, b.b) == 0;
-}
-
-constexpr Base base;
-constexpr Base base2(76);
-constexpr Derived derived;
-static_assert_fold(derived.a == 76, "");
-static_assert_fold(derived.b[2] == 's', "");
-static_assert_fold(derived.c == 76 + 'e', "");
-static_assert_fold(derived.q == 123, "");
-static_assert_fold(derived.r == 76, "");
-static_assert_fold(&derived.r == &derived.a, ""); // expected-error {{}}
-
-static_assert_fold(!(derived == base), "");
-static_assert_fold(derived == base2, "");
-
-}
-
-namespace Union {
-
-union U {
-  int a;
-  int b;
-};
-
-constexpr U u[4] = { { .a = 0 }, { .b = 1 }, { .a = 2 }, { .b = 3 } };
-static_assert_fold(u[0].a == 0, "");
-static_assert_fold(u[0].b, ""); // expected-error {{constant expression}}
-static_assert_fold(u[1].b == 1, "");
-static_assert_fold((&u[1].b)[1] == 2, ""); // expected-error {{constant expression}}
-static_assert_fold(*(&(u[1].b) + 1 + 1) == 3, ""); // expected-error {{constant expression}}
-static_assert_fold((&(u[1]) + 1 + 1)->b == 3, "");
-
-}
-
-namespace Complex {
-
-class complex {
-  int re, im;
-public:
-  constexpr complex(int re = 0, int im = 0) : re(re), im(im) {}
-  constexpr complex(const complex &o) : re(o.re), im(o.im) {}
-  constexpr complex operator-() const { return complex(-re, -im); }
-  friend constexpr complex operator+(const complex &l, const complex &r) {
-    return complex(l.re + r.re, l.im + r.im);
-  }
-  friend constexpr complex operator-(const complex &l, const complex &r) {
-    return l + -r;
-  }
-  friend constexpr complex operator*(const complex &l, const complex &r) {
-    return complex(l.re * r.re - l.im * r.im, l.re * r.im + l.im * r.re);
-  }
-  friend constexpr bool operator==(const complex &l, const complex &r) {
-    return l.re == r.re && l.im == r.im;
-  }
-  constexpr int real() const { return re; }
-  constexpr int imag() const { return im; }
-};
-
-constexpr complex i = complex(0, 1);
-constexpr complex k = (3 + 4*i) * (6 - 4*i);
-static_assert_fold(k.real() == 34, "");
-static_assert_fold(k.imag() == 12, "");
-static_assert_fold(k - 34 == 12*i, "");
-
-}