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| author | Richard Sandiford <rsandifo@redhat.com> | 2001-10-16 13:07:29 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2001-10-16 13:07:29 +0000 |
| commit | d9f818d95c59cae78c94283bc277e77876cd25f7 (patch) | |
| tree | b2d3d48c1e9e34a20a01c82573b3db0adc9e80d0 /gcc/cp/pt.c | |
| parent | 2d1245b8c88b20c6cfe0026b105d62e2f24b172f (diff) | |
| download | gcc-d9f818d95c59cae78c94283bc277e77876cd25f7.zip gcc-d9f818d95c59cae78c94283bc277e77876cd25f7.tar.gz gcc-d9f818d95c59cae78c94283bc277e77876cd25f7.tar.bz2 | |
pt.c (UNIFY_ALLOW_MAX_CORRECTION): Define.
* pt.c (UNIFY_ALLOW_MAX_CORRECTION): Define.
(unify): Only handle MINUS_EXPR specially if the above flag is set
and the subtracted constant is 1. Clear the flag on recursive calls.
Set it when unifying the maximum value in an INTEGER_TYPE's range.
From-SVN: r46287
Diffstat (limited to 'gcc/cp/pt.c')
| -rw-r--r-- | gcc/cp/pt.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index e2904b5..5a5cf4d 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -84,6 +84,7 @@ static htab_t local_specializations; #define UNIFY_ALLOW_OUTER_LEVEL 16 #define UNIFY_ALLOW_OUTER_MORE_CV_QUAL 32 #define UNIFY_ALLOW_OUTER_LESS_CV_QUAL 64 +#define UNIFY_ALLOW_MAX_CORRECTION 128 #define GTB_VIA_VIRTUAL 1 /* The base class we are examining is virtual, or a base class of a virtual @@ -8473,7 +8474,14 @@ check_cv_quals_for_unify (strict, arg, parm) qualified at this point. UNIFY_ALLOW_OUTER_LESS_CV_QUAL: This is the outermost level of a deduction, and PARM can be less CV - qualified at this point. */ + qualified at this point. + UNIFY_ALLOW_MAX_CORRECTION: + This is an INTEGER_TYPE's maximum value. Used if the range may + have been derived from a size specification, such as an array size. + If the size was given by a nontype template parameter N, the maximum + value will have the form N-1. The flag says that we can (and indeed + must) unify N with (ARG + 1), an exception to the normal rules on + folding PARM. */ static int unify (tparms, targs, parm, arg, strict) @@ -8529,6 +8537,7 @@ unify (tparms, targs, parm, arg, strict) strict &= ~UNIFY_ALLOW_DERIVED; strict &= ~UNIFY_ALLOW_OUTER_MORE_CV_QUAL; strict &= ~UNIFY_ALLOW_OUTER_LESS_CV_QUAL; + strict &= ~UNIFY_ALLOW_MAX_CORRECTION; switch (TREE_CODE (parm)) { @@ -8784,7 +8793,8 @@ unify (tparms, targs, parm, arg, strict) return 1; if (TYPE_MAX_VALUE (parm) && TYPE_MAX_VALUE (arg) && unify (tparms, targs, TYPE_MAX_VALUE (parm), - TYPE_MAX_VALUE (arg), UNIFY_ALLOW_INTEGER)) + TYPE_MAX_VALUE (arg), + UNIFY_ALLOW_INTEGER | UNIFY_ALLOW_MAX_CORRECTION)) return 1; } /* We have already checked cv-qualification at the top of the @@ -8914,7 +8924,8 @@ unify (tparms, targs, parm, arg, strict) return 1; case MINUS_EXPR: - if (TREE_CODE (TREE_OPERAND (parm, 1)) == INTEGER_CST) + if (tree_int_cst_equal (TREE_OPERAND (parm, 1), integer_one_node) + && (strict_in & UNIFY_ALLOW_MAX_CORRECTION)) { /* We handle this case specially, since it comes up with arrays. In particular, something like: |