From b3b2bae4e2a40ede680da463415bf8e4e885b93e Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Wed, 27 Apr 2016 15:29:34 +0200 Subject: [PATCH] re PR sanitizer/70683 (-fcompare-debug bug with -fsanitize=address) PR sanitizer/70683 * tree-core.h (enum operand_equal_flag): Add OEP_NO_HASH_CHECK. * fold-const.c (operand_equal_p): If flag_checking and OEP_NO_HASH_CHECK is not set in flag, recurse with OEP_NO_HASH_CHECK and if it returns non-zero, assert iterative_hash_expr on both args is the same. From-SVN: r235507 --- gcc/ChangeLog | 9 +++++++++ gcc/fold-const.c | 19 +++++++++++++++++++ gcc/tree-core.h | 4 +++- 3 files changed, 31 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f99b0c3aae4b..6d26cb00a95d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,12 @@ +2016-04-27 Jakub Jelinek + + PR sanitizer/70683 + * tree-core.h (enum operand_equal_flag): Add OEP_NO_HASH_CHECK. + * fold-const.c (operand_equal_p): If flag_checking and + OEP_NO_HASH_CHECK is not set in flag, recurse with OEP_NO_HASH_CHECK + and if it returns non-zero, assert iterative_hash_expr on both + args is the same. + 2016-04-27 Bernd Schmidt * doc/invoke.texi (-frename-registers): Also enabled at -Os. diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 1ce66e7d090a..7fc23c6c3d52 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -2749,6 +2749,25 @@ combine_comparisons (location_t loc, int operand_equal_p (const_tree arg0, const_tree arg1, unsigned int flags) { + /* When checking, verify at the outermost operand_equal_p call that + if operand_equal_p returns non-zero then ARG0 and ARG1 has the same + hash value. */ + if (flag_checking && !(flags & OEP_NO_HASH_CHECK)) + { + if (operand_equal_p (arg0, arg1, flags | OEP_NO_HASH_CHECK)) + { + inchash::hash hstate0 (0), hstate1 (0); + inchash::add_expr (arg0, hstate0, flags); + inchash::add_expr (arg1, hstate1, flags); + hashval_t h0 = hstate0.end (); + hashval_t h1 = hstate1.end (); + gcc_assert (h0 == h1); + return 1; + } + else + return 0; + } + /* If either is ERROR_MARK, they aren't equal. */ if (TREE_CODE (arg0) == ERROR_MARK || TREE_CODE (arg1) == ERROR_MARK || TREE_TYPE (arg0) == error_mark_node diff --git a/gcc/tree-core.h b/gcc/tree-core.h index 0d48ff59d523..6d573d7b6d29 100644 --- a/gcc/tree-core.h +++ b/gcc/tree-core.h @@ -765,7 +765,9 @@ enum operand_equal_flag { OEP_ONLY_CONST = 1, OEP_PURE_SAME = 2, OEP_MATCH_SIDE_EFFECTS = 4, - OEP_ADDRESS_OF = 8 + OEP_ADDRESS_OF = 8, + /* Internal within operand_equal_p: */ + OEP_NO_HASH_CHECK = 16 }; /* Enum and arrays used for tree allocation stats. -- 2.47.2