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From: Andrew Macleod <amacleod@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-2797] Convert CFN_BUILT_IN_STRLEN to range-ops. Date: Thu, 22 Sep 2022 18:50:08 +0000 (GMT) [thread overview] Message-ID: <20220922185008.A0E043858029@sourceware.org> (raw) https://gcc.gnu.org/g:c750e675cb77f283ff991682db7740bc5f6d4cf4 commit r13-2797-gc750e675cb77f283ff991682db7740bc5f6d4cf4 Author: Andrew MacLeod <amacleod@redhat.com> Date: Tue Sep 20 19:05:03 2022 -0400 Convert CFN_BUILT_IN_STRLEN to range-ops. * gimple-range-fold.cc (range_of_builtin_int_call): Remove case for CFN_BUILT_IN_STRLEN. * gimple-range-op.cc (class cfn_strlen): New. (gimple_range_op_handler::maybe_builtin_call): Set arguments. Diff: --- gcc/gimple-range-fold.cc | 21 --------------------- gcc/gimple-range-op.cc | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+), 21 deletions(-) diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc index d445270417a..d22fb0e9352 100644 --- a/gcc/gimple-range-fold.cc +++ b/gcc/gimple-range-fold.cc @@ -908,27 +908,6 @@ fold_using_range::range_of_builtin_int_call (irange &r, gcall *call, return true; } - case CFN_BUILT_IN_STRLEN: - if (tree lhs = gimple_call_lhs (call)) - if (ptrdiff_type_node - && (TYPE_PRECISION (ptrdiff_type_node) - == TYPE_PRECISION (TREE_TYPE (lhs)))) - { - tree type = TREE_TYPE (lhs); - tree max = vrp_val_max (ptrdiff_type_node); - wide_int wmax - = wi::to_wide (max, TYPE_PRECISION (TREE_TYPE (max))); - tree range_min = build_zero_cst (type); - // To account for the terminating NULL, the maximum length - // is one less than the maximum array size, which in turn - // is one less than PTRDIFF_MAX (or SIZE_MAX where it's - // smaller than the former type). - // FIXME: Use max_object_size() - 1 here. - tree range_max = wide_int_to_tree (type, wmax - 2); - r.set (range_min, range_max); - return true; - } - break; default: break; } diff --git a/gcc/gimple-range-op.cc b/gcc/gimple-range-op.cc index 09b7dd2add3..f9161b5820f 100644 --- a/gcc/gimple-range-op.cc +++ b/gcc/gimple-range-op.cc @@ -611,6 +611,30 @@ cfn_ubsan op_cfn_ubsan_add (PLUS_EXPR); cfn_ubsan op_cfn_ubsan_sub (MINUS_EXPR); cfn_ubsan op_cfn_ubsan_mul (MULT_EXPR); + +// Implement range operator for CFN_BUILT_IN_STRLEN +class cfn_strlen : public range_operator +{ +public: + using range_operator::fold_range; + virtual bool fold_range (irange &r, tree type, const irange &, + const irange &, relation_kind) const + { + tree max = vrp_val_max (ptrdiff_type_node); + wide_int wmax + = wi::to_wide (max, TYPE_PRECISION (TREE_TYPE (max))); + tree range_min = build_zero_cst (type); + // To account for the terminating NULL, the maximum length + // is one less than the maximum array size, which in turn + // is one less than PTRDIFF_MAX (or SIZE_MAX where it's + // smaller than the former type). + // FIXME: Use max_object_size() - 1 here. + tree range_max = wide_int_to_tree (type, wmax - 2); + r.set (range_min, range_max); + return true; + } +} op_cfn_strlen; + // Set up a gimple_range_op_handler for any built in function which can be // supported via range-ops. @@ -711,6 +735,19 @@ gimple_range_op_handler::maybe_builtin_call () m_int = &op_cfn_ubsan_mul; break; + case CFN_BUILT_IN_STRLEN: + { + tree lhs = gimple_call_lhs (call); + if (lhs && ptrdiff_type_node && (TYPE_PRECISION (ptrdiff_type_node) + == TYPE_PRECISION (TREE_TYPE (lhs)))) + { + m_op1 = gimple_call_arg (call, 0); + m_valid = true; + m_int = &op_cfn_strlen; + } + break; + } + default: break; }
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