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re PR c++/82307 (unscoped enum-base incorrect cast)

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/cp
2017-10-24  Mukesh Kapoor  <mukesh.kapoor@oracle.com>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/82307
	* cvt.c (type_promotes_to): Implement C++17, 7.6/4, about unscoped
	enumeration type whose underlying type is fixed.

/testsuite
2017-10-24  Mukesh Kapoor  <mukesh.kapoor@oracle.com>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/82307
	* g++.dg/cpp0x/enum35.C: New.
	* g++.dg/cpp0x/enum36.C: Likewise.

Co-Authored-By: Paolo Carlini <paolo.carlini@oracle.com>

From-SVN: r254046
This commit is contained in:
Mukesh Kapoor 2017-10-24 13:49:13 +00:00 committed by Paolo Carlini
parent d56a36834f
commit eab01c18fd
5 changed files with 60 additions and 3 deletions
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7
gcc/cp/ChangeLog
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@ -1,3 +1,10 @@
2017-10-24 Mukesh Kapoor <mukesh.kapoor@oracle.com>
Paolo Carlini <paolo.carlini@oracle.com>
PR c++/82307
* cvt.c (type_promotes_to): Implement C++17, 7.6/4, about unscoped
enumeration type whose underlying type is fixed.
2017-10-23 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/80449

21
gcc/cp/cvt.c
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@ -1834,12 +1834,27 @@ type_promotes_to (tree type)
|| type == char32_type_node
|| type == wchar_type_node)
{
tree prom = type;
if (TREE_CODE (type) == ENUMERAL_TYPE)
{
prom = ENUM_UNDERLYING_TYPE (prom);
if (!ENUM_IS_SCOPED (type)
&& ENUM_FIXED_UNDERLYING_TYPE_P (type))
{
/* ISO C++17, 7.6/4. A prvalue of an unscoped enumeration type
whose underlying type is fixed (10.2) can be converted to a
prvalue of its underlying type. Moreover, if integral promotion
can be applied to its underlying type, a prvalue of an unscoped
enumeration type whose underlying type is fixed can also be
converted to a prvalue of the promoted underlying type. */
return type_promotes_to (prom);
}
}
int precision = MAX (TYPE_PRECISION (type),
TYPE_PRECISION (integer_type_node));
tree totype = c_common_type_for_size (precision, 0);
tree prom = type;
if (TREE_CODE (prom) == ENUMERAL_TYPE)
prom = ENUM_UNDERLYING_TYPE (prom);
if (TYPE_UNSIGNED (prom)
&& ! int_fits_type_p (TYPE_MAX_VALUE (prom), totype))
prom = c_common_type_for_size (precision, 1);

7
gcc/testsuite/ChangeLog
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@ -1,3 +1,10 @@
2017-10-24 Mukesh Kapoor <mukesh.kapoor@oracle.com>
Paolo Carlini <paolo.carlini@oracle.com>
PR c++/82307
* g++.dg/cpp0x/enum35.C: New.
* g++.dg/cpp0x/enum36.C: Likewise.
2017-10-24 H.J. Lu <hongjiu.lu@intel.com>
PR target/82659

14
gcc/testsuite/g++.dg/cpp0x/enum35.C Normal file
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@ -0,0 +1,14 @@
// PR c++/82307
// { dg-do run { target c++11 } }
#include <cassert>
enum : unsigned long long { VAL };
bool foo (unsigned long long) { return true; }
bool foo (int) { return false; }
int main()
{
assert (foo(VAL));
}

14
gcc/testsuite/g++.dg/cpp0x/enum36.C Normal file
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@ -0,0 +1,14 @@
// PR c++/82307
// { dg-do run { target c++11 } }
#include <cassert>
enum : short { VAL };
bool foo (int) { return true; }
bool foo (unsigned long long) { return false; }
int main()
{
assert (foo (VAL));
}