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re PR c++/55250 ([C++0x] enum declarations within constexpr function are allowed, constexpr declarations are not)

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/cp
2014-10-06  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/55250
	* semantics.c (check_constexpr_bind_expr_vars): New.
	(check_constexpr_ctor_body, massage_constexpr_body): Use it.
	(build_constexpr_constructor_member_initializers): Handle
	BIND_EXPR in the main conditional.

/testsuite
2014-10-06  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/55250
	* g++.dg/cpp0x/constexpr-type-decl1.C: New.
	* g++.dg/cpp0x/constexpr-type-def1.C: Likewise.
	* g++.dg/cpp1y/constexpr-type-def1.C: Likewise.

From-SVN: r215954
This commit is contained in:
Paolo Carlini 2014-10-06 16:13:41 +00:00 committed by Paolo Carlini
parent c4b64f5bca
commit fbf833b776
6 changed files with 201 additions and 4 deletions
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8
gcc/cp/ChangeLog
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@ -1,3 +1,11 @@
2014-10-06 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/55250
* semantics.c (check_constexpr_bind_expr_vars): New.
(check_constexpr_ctor_body, massage_constexpr_body): Use it.
(build_constexpr_constructor_member_initializers): Handle
BIND_EXPR in the main conditional.
2014-10-02 Mark Wielaard <mjw@redhat.com>
PR debug/63239

28
gcc/cp/semantics.c
View File

@ -7833,6 +7833,25 @@ build_data_member_initialization (tree t, vec<constructor_elt, va_gc> **vec)
return true;
}
/* Subroutine of check_constexpr_ctor_body and massage_constexpr_body.
In C++11 mode checks that the TYPE_DECLs in the BIND_EXPR_VARS of a
BIND_EXPR conform to 7.1.5/3/4 on typedef and alias declarations. */
static bool
check_constexpr_bind_expr_vars (tree t)
{
gcc_assert (TREE_CODE (t) == BIND_EXPR);
if (cxx_dialect >= cxx14)
return true;
for (tree var = BIND_EXPR_VARS (t); var; var = DECL_CHAIN (var))
if (TREE_CODE (var) == TYPE_DECL
&& DECL_IMPLICIT_TYPEDEF_P (var))
return false;
return true;
}
/* Make sure that there are no statements after LAST in the constructor
body represented by LIST. */
@ -7850,7 +7869,7 @@ check_constexpr_ctor_body (tree last, tree list)
break;
if (TREE_CODE (t) == BIND_EXPR)
{
if (BIND_EXPR_VARS (t))
if (!check_constexpr_bind_expr_vars (t))
{
ok = false;
break;
@ -7860,8 +7879,6 @@ check_constexpr_ctor_body (tree last, tree list)
else
continue;
}
/* We currently allow typedefs and static_assert.
FIXME allow them in the standard, too. */
if (TREE_CODE (t) != STATIC_ASSERT)
{
ok = false;
@ -7964,6 +7981,8 @@ build_constexpr_constructor_member_initializers (tree type, tree body)
"a function-try-block");
return error_mark_node;
}
else if (TREE_CODE (body) == BIND_EXPR)
ok = build_data_member_initialization (BIND_EXPR_BODY (body), &vec);
else if (EXPR_P (body))
ok = build_data_member_initialization (body, &vec);
else
@ -8055,7 +8074,8 @@ massage_constexpr_body (tree fun, tree body)
body = EH_SPEC_STMTS (body);
if (TREE_CODE (body) == MUST_NOT_THROW_EXPR)
body = TREE_OPERAND (body, 0);
if (TREE_CODE (body) == BIND_EXPR)
if (TREE_CODE (body) == BIND_EXPR
&& check_constexpr_bind_expr_vars (body))
body = BIND_EXPR_BODY (body);
body = constexpr_fn_retval (body);
}

7
gcc/testsuite/ChangeLog
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@ -1,3 +1,10 @@
2014-10-06 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/55250
* g++.dg/cpp0x/constexpr-type-decl1.C: New.
* g++.dg/cpp0x/constexpr-type-def1.C: Likewise.
* g++.dg/cpp1y/constexpr-type-def1.C: Likewise.
2014-10-06 Marek Polacek <polacek@redhat.com>
* c-c++-common/raw-string-3.c: Use -std=gnu89 for C.

58
gcc/testsuite/g++.dg/cpp0x/constexpr-type-decl1.C Normal file
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@ -0,0 +1,58 @@
// PR c++/55250
// { dg-do compile { target c++11 } }
#define SA(X) static_assert((X),#X)
struct GS { constexpr operator int() { return 1; } };
enum GE { y = 1 };
constexpr int Test1(int x) { typedef int T; return T(x) + 1; }
constexpr int Test2(int x) { using T = int; return T(x) + 1; }
constexpr int Test3(int x) { typedef GS T; return x + T(); }
constexpr int Test4(int x) { using T = GS; return x + T(); }
constexpr int Test5(int x) { typedef GE T; return x + T::y; }
constexpr int Test6(int x) { using T = GE; return x + T::y; }
SA(Test1(2) == 3);
SA(Test2(2) == 3);
SA(Test3(2) == 3);
SA(Test4(2) == 3);
SA(Test5(2) == 3);
SA(Test6(2) == 3);
struct S1
{
constexpr S1() { typedef int T; SA(T(1) == 1); }
};
struct S2
{
constexpr S2() { using T = int; SA(T(1) == 1); }
};
struct S3
{
constexpr S3() { typedef GS T; SA(T() == 1); }
};
struct S4
{
constexpr S4() { using T = GS; SA(T() == 1); }
};
struct S5
{
constexpr S5() { typedef GE T; SA(T::y == 1); }
};
struct S6
{
constexpr S6() { using T = GE; SA(T::y == 1); }
};
S1 s1;
S2 s2;
S3 s3;
S4 s4;
S5 s5;
S6 s6;

44
gcc/testsuite/g++.dg/cpp0x/constexpr-type-def1.C Normal file
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@ -0,0 +1,44 @@
// PR c++/55250
// { dg-do compile { target c++11 } }
constexpr int Test1(int x) { enum E { y = 1 }; return x; } // { dg-error "not a return-statement" "" { target { c++11_only } } }
constexpr int Test2(int x) { struct T { }; return x; } // { dg-error "not a return-statement" "" { target { c++11_only } } }
constexpr int Test3(int x) { typedef enum E { y = 1 } EE; return x; } // { dg-error "not a return-statement" "" { target { c++11_only } } }
constexpr int Test4(int x) { typedef struct T { } TT; return x; } // { dg-error "not a return-statement" "" { target { c++11_only } } }
constexpr int Test5(int x) { using EE = enum E { y = 1 }; return x; } // { dg-error "not a return-statement" "" { target { c++11_only } } }
constexpr int Test6(int x) { using TT = struct T { }; return x; } // { dg-error "not a return-statement" "" { target { c++11_only } } }
struct S1
{
constexpr S1() { enum E { y = 1 }; } // { dg-error "does not have empty body" "" { target { c++11_only } } }
};
struct S2
{
constexpr S2() { struct T { }; } // { dg-error "does not have empty body" "" { target { c++11_only } } }
};
struct S3
{
constexpr S3() { typedef enum E { y = 1 } EE; } // { dg-error "does not have empty body" "" { target { c++11_only } } }
};
struct S4
{
constexpr S4() { typedef struct T { } TT; } // { dg-error "does not have empty body" "" { target { c++11_only } } }
};
struct S5
{
constexpr S5() { using EE = enum E { y = 1 }; } // { dg-error "does not have empty body" "" { target { c++11_only } } }
};
struct S6
{
constexpr S6() { using TT = struct T { }; } // { dg-error "does not have empty body" "" { target { c++11_only } } }
};

60
gcc/testsuite/g++.dg/cpp1y/constexpr-type-def1.C Normal file
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@ -0,0 +1,60 @@
// PR c++/55250
// { dg-do compile { target c++14 } }
#define SA(X) static_assert((X),#X)
constexpr int Test1(int x) { enum E { y = 1 }; return x + y; }
constexpr int Test2(int x) { struct T { constexpr operator int() { return 1; } }; return x + T(); }
constexpr int Test3(int x) { typedef enum E { y = 1 } EE; return x + EE::y; }
constexpr int Test4(int x) { typedef struct T { constexpr operator int() { return 1; } } TT; return x + TT(); }
constexpr int Test5(int x) { using EE = enum E { y = 1 }; return x + EE::y; }
constexpr int Test6(int x) { using TT = struct T { constexpr operator int() { return 1; } }; return x + TT(); }
SA(Test1(2) == 3);
SA(Test2(2) == 3);
SA(Test3(2) == 3);
SA(Test4(2) == 3);
SA(Test5(2) == 3);
SA(Test6(2) == 3);
struct S1
{
constexpr S1() { enum E { y = 1 }; SA(y == 1); }
};
struct S2
{
constexpr S2() { struct T { constexpr operator int() { return 1; } }; SA(T() == 1); }
};
struct S3
{
constexpr S3() { typedef enum E { y = 1} EE; SA(EE::y == 1); }
};
struct S4
{
constexpr S4() { typedef struct T { constexpr operator int() { return 1; } } TT; SA(TT() == 1); }
};
struct S5
{
constexpr S5() { using EE = enum E { y = 1}; SA(EE::y == 1); }
};
struct S6
{
constexpr S6() { using TT = struct T { constexpr operator int() { return 1; } }; SA(TT() == 1); }
};
S1 s1;
S2 s2;
S3 s3;
S4 s4;
S5 s5;
S6 s6;