From 6142ca7790aa09a6e13592b70f142cc4bbcadcae Mon Sep 17 00:00:00 2001 From: Devang Patel Date: Thu, 10 Nov 2011 17:47:39 +0000 Subject: [PATCH] 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 | 87 +-- test/SemaCXX/constant-expression-cxx11.cpp | 642 --------------------- 2 files changed, 31 insertions(+), 698 deletions(-) delete mode 100644 test/SemaCXX/constant-expression-cxx11.cpp diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp index ca936f0ff8..25c7a90caa 100644 --- a/lib/AST/ExprConstant.cpp +++ b/lib/AST/ExprConstant.cpp @@ -1029,9 +1029,8 @@ static bool EvaluateArgs(ArrayRef Args, ArgVector &ArgValues, } /// Evaluate a function call. -static bool HandleFunctionCall(const LValue *This, ArrayRef Args, - const Stmt *Body, EvalInfo &Info, - CCValue &Result) { +static bool HandleFunctionCall(ArrayRef Args, const Stmt *Body, + EvalInfo &Info, 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 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, - ArrayRef Args, +static bool HandleConstructorCall(ArrayRef 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(); - const FunctionDecl *FD = 0; - LValue *This = 0, ThisVal; - llvm::ArrayRef Args(E->getArgs(), E->getNumArgs()); + // FIXME: Handle the case where Callee is a (parenthesized) MemberExpr for a + // non-static member function. + if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) + return DerivedError(E); - // Extract function decl and 'this' pointer from the callee. - if (CalleeType->isSpecificBuiltinType(BuiltinType::BoundMember)) { - const MemberExpr *ME = dyn_cast(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; + 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; + if (const DeclRefExpr *DRE = dyn_cast(Call.getLValueBase())) + FD = dyn_cast(DRE->getDecl()); + else if (const MemberExpr *ME = dyn_cast(Call.getLValueBase())) FD = dyn_cast(ME->getMemberDecl()); - if (!FD) - return DerivedError(ME); - } 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(); - - if (const DeclRefExpr *DRE = dyn_cast(Base)) - FD = dyn_cast(DRE->getDecl()); - else if (const MemberExpr *ME = dyn_cast(Base)) - FD = dyn_cast(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(FD); - if (MD && !MD->isStatic()) { - if (!EvaluateLValue(Args[0], ThisVal, Info)) - return DerivedError(Args[0]); - This = &ThisVal; - Args = Args.slice(1); - } + if (!FD) + return DerivedError(Callee); - // Don't call function pointers which have been cast to some other type. - if (!Info.Ctx.hasSameType(CalleeType->getPointeeType(), FD->getType())) - return DerivedError(E); - } + // 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 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 Args(E->getArgs(), E->getNumArgs()); - return HandleConstructorCall(This, Args, cast(Definition), - Info, Result); + return HandleConstructorCall(Args, cast(Definition), + Info, This, Result); } static bool EvaluateRecord(const Expr *E, const LValue &This, diff --git a/test/SemaCXX/constant-expression-cxx11.cpp b/test/SemaCXX/constant-expression-cxx11.cpp deleted file mode 100644 index 37d5876682..0000000000 --- a/test/SemaCXX/constant-expression-cxx11.cpp +++ /dev/null @@ -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 constexpr T id(const T &t) { return t; } -template constexpr T id(T t) { return t; } -// FIXME: support templates here. -//template constexpr T min(const T &a, const T &b) { -// return a < b ? a : b; -//} -//template 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 struct IntParam {}; - - using IntParam0 = IntParam<0>; - // FIXME: This should be accepted once we do constexpr function invocation. - using IntParam0 = IntParam; // expected-error {{not an integral constant expression}} - using IntParam0 = IntParam; // 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(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 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, ""); - -} -- 2.40.0