From patchwork Wed Apr 27 16:19:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Noah Goldstein X-Patchwork-Id: 53269 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 931AA3857415 for ; Wed, 27 Apr 2022 16:21:39 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 931AA3857415 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1651076499; bh=YuUUw2VN7vLkI2ePkgaAU8Z9+E2hdxuKVjnEaG/jV1g=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=EEH0mm7XCizcKLcH0aH9fWwJfzqmndqii42keFHYRJPuezBeWvgHK+4rwOPrzRf8j 4CXZMwE+4gbLdyTYHG/1JRWtXRL6ODT/vAwJTOJmQpEfEpm1Oeztef51dcWV57DkDk +ae9dn+xui5jBN7kDoyCYNrUyAuYufkxBgr+ZlKQ= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by sourceware.org (Postfix) with ESMTPS id D130B385742D for ; Wed, 27 Apr 2022 16:20:09 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D130B385742D Received: by mail-pj1-x102f.google.com with SMTP id j8-20020a17090a060800b001cd4fb60dccso2157245pjj.2 for ; Wed, 27 Apr 2022 09:20:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=YuUUw2VN7vLkI2ePkgaAU8Z9+E2hdxuKVjnEaG/jV1g=; b=f22FihElxY9PR8SSp5vjgSFGGCTIYGlhtW7lyJXO8kS5HXAZSYTRf/sPAWj8JdelsA wPbju2hiBgzhBFOOLjgJJhh8e3oiIr5goRKUs+AwBf1tzTN11jewTP5IArmj9rjzBt6L p1WQQQFGWTv5p1ruV5MWoGS97+FSJPFBsP1LUdG+RQXBhvOM6fE0pcLfWCwBYgAQuhce q6JilS93JSIQDVPgvpeNCZnY8ZrVyMxJHgAOdLjeOdoUbFagmMAshfpwfgBTM9pQvDCU xuscBPTdMdOhpo2RCqmzYThpZ2Actt3WT+BNahUT6GenftZk95yLr26zJwGQSCHDC17Q nGQw== X-Gm-Message-State: AOAM530rqovFi/dxFiYpvu19+g14JAjOOvh9uMf+L2XuzHwMHoIBXWZ1 vYjfyfJL/3ZGkMq1Xm71vSHjvcZ4siM= X-Google-Smtp-Source: ABdhPJwhjktYJA53HOKTFq5aXkyQMwvt+RQvvdzyB/pNWLT3L4zvzOgKEnm7//4NUqAWo8ma31qhEw== X-Received: by 2002:a17:902:f68b:b0:15d:4c2a:c8a with SMTP id l11-20020a170902f68b00b0015d4c2a0c8amr5246099plg.112.1651076408676; Wed, 27 Apr 2022 09:20:08 -0700 (PDT) Received: from localhost.localdomain ([64.145.94.63]) by smtp.googlemail.com with ESMTPSA id j13-20020a17090a2a8d00b001cd4989fed3sm7565645pjd.31.2022.04.27.09.20.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Apr 2022 09:20:08 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v4 1/6] elf: Refactor dl_new_hash so it can be tested / benchmarked Date: Wed, 27 Apr 2022 11:19:57 -0500 Message-Id: <20220427162002.2180312-1-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220414041231.926415-1-goldstein.w.n@gmail.com> References: <20220414041231.926415-1-goldstein.w.n@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Noah Goldstein via Libc-alpha From: Noah Goldstein Reply-To: Noah Goldstein Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" No change to the code other than moving the function to dl-new-hash.h. Changed name so its now in the reserved namespace. --- elf/dl-lookup.c | 13 ++----------- elf/dl-new-hash.h | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+), 11 deletions(-) create mode 100644 elf/dl-new-hash.h diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c index 989b073e4f..a42f6d5390 100644 --- a/elf/dl-lookup.c +++ b/elf/dl-lookup.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -558,16 +559,6 @@ skip: } -static uint32_t -dl_new_hash (const char *s) -{ - uint32_t h = 5381; - for (unsigned char c = *s; c != '\0'; c = *++s) - h = h * 33 + c; - return h; -} - - /* Add extra dependency on MAP to UNDEF_MAP. */ static int add_dependency (struct link_map *undef_map, struct link_map *map, int flags) @@ -816,7 +807,7 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map, const struct r_found_version *version, int type_class, int flags, struct link_map *skip_map) { - const unsigned int new_hash = dl_new_hash (undef_name); + const unsigned int new_hash = _dl_new_hash (undef_name); unsigned long int old_hash = 0xffffffff; struct sym_val current_value = { NULL, NULL }; struct r_scope_elem **scope = symbol_scope; diff --git a/elf/dl-new-hash.h b/elf/dl-new-hash.h new file mode 100644 index 0000000000..40d88c81f9 --- /dev/null +++ b/elf/dl-new-hash.h @@ -0,0 +1,35 @@ +/* _dl_new_hash for elf symbol lookup + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _DL_NEW_HASH_H +#define _DL_NEW_HASH_H 1 + +#include + +static inline uint32_t +__attribute__ ((unused)) +_dl_new_hash (const char *s) +{ + uint32_t h = 5381; + for (unsigned char c = *s; c != '\0'; c = *++s) + h = h * 33 + c; + return h; +} + + +#endif /* dl-new-hash.h */