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re PR c++/18949 (trouble with const_cast in templates) 

cp:
	PR c++/18949
	* pt.c (tsubst_copy_and_build): <INDIRECT_REF case> Check that a
	REFERENCE_REF_P is dereferencing a reference type.
	* typeck.c (build_static_cast): Convert from reference even in a
	template.
	(build_reinterpret_cast, build_const_cast, build_c_cast): Likewise.
testsuite:
	PR c++/18949
	* g++.dg/template/cast1.C: New.

From-SVN: r92136
This commit is contained in:
Nathan Sidwell 2004-12-14 15:39:12 +00:00 committed by Nathan Sidwell
parent 3a42aebe0b
commit e8c66fe0e1
5 changed files with 45 additions and 6 deletions
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9
gcc/cp/ChangeLog
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@ -1,3 +1,12 @@
2004-12-14 Nathan Sidwell <nathan@codesourcery.com>
PR c++/18949
* pt.c (tsubst_copy_and_build): <INDIRECT_REF case> Check that a
REFERENCE_REF_P is dereferencing a reference type.
* typeck.c (build_static_cast): Convert from reference even in a
template.
(build_reinterpret_cast, build_const_cast, build_c_cast): Likewise.
2004-12-14 Volker Reichelt <reichelt@igpm.rwth-aachen.de>
* parser.c (cp_parser_uncommitted_to_tentative_parse_p): New function.

7
gcc/cp/pt.c
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@ -8395,8 +8395,11 @@ tsubst_copy_and_build (tree t,
if (REFERENCE_REF_P (t))
{
gcc_assert (TREE_CODE (TREE_TYPE (r)) == REFERENCE_TYPE);
r = convert_from_reference (r);
/* A type conversion to reference type will be enclosed in
such an indirect ref, but the substitution of the cast
will have also added such an indirect ref. */
if (TREE_CODE (TREE_TYPE (r)) == REFERENCE_TYPE)
r = convert_from_reference (r);
}
else
r = build_x_indirect_ref (r, "unary *");

8
gcc/cp/typeck.c
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@ -4767,7 +4767,7 @@ build_static_cast (tree type, tree expr)
expr = build_min (STATIC_CAST_EXPR, type, expr);
/* We don't know if it will or will not have side effects. */
TREE_SIDE_EFFECTS (expr) = 1;
return expr;
return convert_from_reference (expr);
}
/* build_c_cast puts on a NOP_EXPR to make the result not an lvalue.
@ -4983,7 +4983,7 @@ build_reinterpret_cast (tree type, tree expr)
&& type_dependent_expression_p (expr))
/* There might turn out to be side effects inside expr. */
TREE_SIDE_EFFECTS (t) = 1;
return t;
return convert_from_reference (t);
}
return build_reinterpret_cast_1 (type, expr, /*c_cast_p=*/false,
@ -5111,7 +5111,7 @@ build_const_cast (tree type, tree expr)
&& type_dependent_expression_p (expr))
/* There might turn out to be side effects inside expr. */
TREE_SIDE_EFFECTS (t) = 1;
return t;
return convert_from_reference (t);
}
return build_const_cast_1 (type, expr, /*complain=*/true,
@ -5137,7 +5137,7 @@ build_c_cast (tree type, tree expr)
tree_cons (NULL_TREE, value, NULL_TREE));
/* We don't know if it will or will not have side effects. */
TREE_SIDE_EFFECTS (t) = 1;
return t;
return convert_from_reference (t);
}
/* Casts to a (pointer to a) specific ObjC class (or 'id' or

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2004-12-14 Nathan Sidwell <nathan@codesourcery.com>
PR c++/18949
* g++.dg/template/cast1.C: New.
2004-12-13 Richard Henderson <rth@redhat.com>
* gcc.dg/i386-sse-10.c: Fix typo in options.

22
gcc/testsuite/g++.dg/template/cast1.C Normal file
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@ -0,0 +1,22 @@
// { dg-do compile }
// Copyright (C) 2004 Free Software Foundation, Inc.
// Contributed by Nathan Sidwell 14 Dec 2004 <nathan@codesourcery.com>
// PR 18949. Forgot to convert from reference.
// Origin: Volker Reichelt <reichelt@gcc.gnu.org>
struct A
{
void foo();
};
template<int> void bar(A& a)
{
const_cast<A&>(a).foo();
static_cast<A&>(a).foo();
reinterpret_cast<A&>(a).foo();
((A&)a).foo();
}
template void bar<0>(A& a);