From patchwork Wed Apr 5 13:17:09 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pedro Alves X-Patchwork-Id: 19863 Received: (qmail 62742 invoked by alias); 5 Apr 2017 13:17:20 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Delivered-To: mailing list gdb-patches@sourceware.org Received: (qmail 62347 invoked by uid 89); 5 Apr 2017 13:17:20 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-24.6 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_NONE, RCVD_IN_SORBS_SPAM autolearn=ham version=3.3.2 spammy= X-HELO: mail-wr0-f179.google.com Received: from mail-wr0-f179.google.com (HELO mail-wr0-f179.google.com) (209.85.128.179) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 05 Apr 2017 13:17:17 +0000 Received: by mail-wr0-f179.google.com with SMTP id w11so13437497wrc.3 for ; Wed, 05 Apr 2017 06:17:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:cc:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=ULkSGO5kfJ+dXnIpykkFGdPKmDUXS328E3tXSM6++qA=; b=NLR7LKvY9CE2ZmApb4JNJERNZMoJjgEfEgxLr0dQ0Krk/HUKSvg+JQQP/5ZuSz0BCo kagyEZ/P5/vWFVtt35cxDfyek1syAlcsmQMqBF53w+6/lhwO8N2kz/CpvCGLm0Cc2qT4 6Xcag3qgDw2IEDpZ4OGsJ+qaHJtBFbPcVcJU6ys5UWNvpRwOp575rktknfzE9h84KFp5 02S3qtT5y1UDruM7duEzc14Q68PdAYdCSmknOBZjQ3cfj7TPnrqUSK9MNu/hJmJNK5B5 XiTJ3tIi/1W4mnz/MBYHNGJG/gnokvWx2D1i108naVFyUVy720wZKV3DWbgdnVtqtN6d Lg/A== X-Gm-Message-State: AFeK/H2Yp7t8g3kt9ZclruQtchn4UiUbsbNsk4fslZSkjYOBJ1vJwGdpERt30n1XlQVNWr/n X-Received: by 10.223.175.81 with SMTP id z75mr7947133wrc.11.1491398236527; Wed, 05 Apr 2017 06:17:16 -0700 (PDT) Received: from [192.168.0.100] ([37.189.166.198]) by smtp.gmail.com with ESMTPSA id h65sm26227811wrh.32.2017.04.05.06.17.15 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Apr 2017 06:17:15 -0700 (PDT) Subject: Re: [PATCH 07/18] -Wwrite-strings: Constify work break character arrays To: Philipp Rudo References: <1491326751-16180-1-git-send-email-palves@redhat.com> <1491326751-16180-8-git-send-email-palves@redhat.com> <20170405104634.20a5a437@ThinkPad> Cc: gdb-patches@sourceware.org From: Pedro Alves Message-ID: <93a6610b-eff5-8b82-2310-61a90fa7c270@redhat.com> Date: Wed, 5 Apr 2017 14:17:09 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <20170405104634.20a5a437@ThinkPad> On 04/05/2017 09:46 AM, Philipp Rudo wrote: > Hi Pedro > > great series. Just one minor thing I noticed here. Thanks! >> /* FIXME: brobecker/2003-09-17: No longer a const because it is >> returned by a function that does not return a const char *. */ >> -static char *ada_completer_word_break_characters = >> +static const char ada_completer_word_break_characters[] = >> #ifdef VMS >> " \t\n!@#%^&*()+=|~`}{[]\";:?/,-"; >> #else > > The comment above doesn't make sense, especially after your > change. I think it should be removed. Indeed, nice catch. I removed the comment. And also fixed the typo in the commit's subject: "work" -> "word"... Here's what I currently have. (Nothing else changed.) From 9171fb380f5267d2346dd3e6b3c5c80192911dfb Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Wed, 5 Apr 2017 12:58:19 +0100 Subject: [PATCH] -Wwrite-strings: Constify word break character arrays -Wwrite-strings flags several cases of missing casts around initializations like: static char *gdb_completer_command_word_break_characters = " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,"; Obviously these could/should be const. However, while at it, there's no need for these variables to be pointers instead of arrays. They are never changed to point to anything else. Unfortunately, readline's rl_completer_word_break_characters is "char *", not "const char *". So we always need a cast somewhere. The approach taken here is to add a new set_rl_completer_word_break_characters function that becomes the only place that writes to rl_completer_word_break_characters, and thus the single place that needs the cast. gdb/ChangeLog: yyyy-mm-dd Pedro Alves * ada-lang.c (ada_completer_word_break_characters): Now a const array. (ada_get_gdb_completer_word_break_characters): Constify. * completer.c (gdb_completer_command_word_break_characters) (gdb_completer_file_name_break_characters) (gdb_completer_quote_characters): Now const arrays. (get_gdb_completer_quote_characters): Constify. (set_rl_completer_word_break_characters): New function. (set_gdb_completion_word_break_characters) (complete_line_internal): Use it. * completer.h (get_gdb_completer_quote_characters): Constify. (set_rl_completer_word_break_characters): Declare. * f-lang.c (f_word_break_characters): Constify. * language.c (default_word_break_characters): Constify. * language.h (language_defn::la_word_break_characters): Constify. (default_word_break_characters): Constify. * top.c (init_main): Use set_rl_completer_word_break_characters. --- gdb/ada-lang.c | 6 ++---- gdb/completer.c | 59 ++++++++++++++++++++++++++++++++++----------------------- gdb/completer.h | 8 +++++++- gdb/f-lang.c | 2 +- gdb/language.c | 2 +- gdb/language.h | 4 ++-- gdb/top.c | 2 +- 7 files changed, 49 insertions(+), 34 deletions(-) diff --git a/gdb/ada-lang.c b/gdb/ada-lang.c index 9b91e0c..7be135e 100644 --- a/gdb/ada-lang.c +++ b/gdb/ada-lang.c @@ -315,9 +315,7 @@ static void ada_free_symbol_cache (struct ada_symbol_cache *sym_cache); /* Maximum-sized dynamic type. */ static unsigned int varsize_limit; -/* FIXME: brobecker/2003-09-17: No longer a const because it is - returned by a function that does not return a const char *. */ -static char *ada_completer_word_break_characters = +static const char ada_completer_word_break_characters[] = #ifdef VMS " \t\n!@#%^&*()+=|~`}{[]\";:?/,-"; #else @@ -558,7 +556,7 @@ add_angle_brackets (const char *str) return result; } -static char * +static const char * ada_get_gdb_completer_word_break_characters (void) { return ada_completer_word_break_characters; diff --git a/gdb/completer.c b/gdb/completer.c index 45adc62..9183e2a 100644 --- a/gdb/completer.c +++ b/gdb/completer.c @@ -84,29 +84,30 @@ char *line_completion_function (const char *text, int matches, readline library sees one in any of the current completion strings, it thinks that the string needs to be quoted and automatically supplies a leading quote. */ -static char *gdb_completer_command_word_break_characters = +static const char gdb_completer_command_word_break_characters[] = " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,"; /* When completing on file names, we remove from the list of word break characters any characters that are commonly used in file names, such as '-', '+', '~', etc. Otherwise, readline displays incorrect completion candidates. */ -#ifdef HAVE_DOS_BASED_FILE_SYSTEM /* MS-DOS and MS-Windows use colon as part of the drive spec, and most programs support @foo style response files. */ -static char *gdb_completer_file_name_break_characters = " \t\n*|\"';?><@"; +static const char gdb_completer_file_name_break_characters[] = +#ifdef HAVE_DOS_BASED_FILE_SYSTEM + " \t\n*|\"';?><@"; #else -static char *gdb_completer_file_name_break_characters = " \t\n*|\"';:?><"; + " \t\n*|\"';:?><"; #endif /* Characters that can be used to quote completion strings. Note that we can't include '"' because the gdb C parser treats such quoted sequences as strings. */ -static char *gdb_completer_quote_characters = "'"; +static const char gdb_completer_quote_characters[] = "'"; /* Accessor for some completer data that may interest other files. */ -char * +const char * get_gdb_completer_quote_characters (void) { return gdb_completer_quote_characters; @@ -652,16 +653,26 @@ expression_completer (struct cmd_list_element *ignore, /* See definition in completer.h. */ void +set_rl_completer_word_break_characters (const char *break_chars) +{ + rl_completer_word_break_characters = (char *) break_chars; +} + +/* See definition in completer.h. */ + +void set_gdb_completion_word_break_characters (completer_ftype *fn) { + const char *break_chars; + /* So far we are only interested in differentiating filename completers from everything else. */ if (fn == filename_completer) - rl_completer_word_break_characters - = gdb_completer_file_name_break_characters; + break_chars = gdb_completer_file_name_break_characters; else - rl_completer_word_break_characters - = gdb_completer_command_word_break_characters; + break_chars = gdb_completer_command_word_break_characters; + + set_rl_completer_word_break_characters (break_chars); } /* Here are some useful test cases for completion. FIXME: These @@ -743,8 +754,8 @@ complete_line_internal (const char *text, then we will switch to the special word break set for command strings, which leaves out the '-' character used in some commands. */ - rl_completer_word_break_characters = - current_language->la_word_break_characters(); + set_rl_completer_word_break_characters + (current_language->la_word_break_characters()); /* Decide whether to complete on a list of gdb commands or on symbols. */ @@ -821,8 +832,8 @@ complete_line_internal (const char *text, } /* Ensure that readline does the right thing with respect to inserting quotes. */ - rl_completer_word_break_characters = - gdb_completer_command_word_break_characters; + set_rl_completer_word_break_characters + (gdb_completer_command_word_break_characters); } } else @@ -848,8 +859,8 @@ complete_line_internal (const char *text, /* Ensure that readline does the right thing with respect to inserting quotes. */ - rl_completer_word_break_characters = - gdb_completer_command_word_break_characters; + set_rl_completer_word_break_characters + (gdb_completer_command_word_break_characters); } else if (reason == handle_help) list = NULL; @@ -857,8 +868,8 @@ complete_line_internal (const char *text, { if (reason != handle_brkchars) list = complete_on_enum (c->enums, p, word); - rl_completer_word_break_characters = - gdb_completer_command_word_break_characters; + set_rl_completer_word_break_characters + (gdb_completer_command_word_break_characters); } else { @@ -879,8 +890,8 @@ complete_line_internal (const char *text, && strchr (gdb_completer_file_name_break_characters, p[-1]) == NULL; p--) ; - rl_completer_word_break_characters = - gdb_completer_file_name_break_characters; + set_rl_completer_word_break_characters + (gdb_completer_file_name_break_characters); } if (reason == handle_brkchars && c->completer_handle_brkchars != NULL) @@ -913,8 +924,8 @@ complete_line_internal (const char *text, /* Ensure that readline does the right thing with respect to inserting quotes. */ - rl_completer_word_break_characters = - gdb_completer_command_word_break_characters; + set_rl_completer_word_break_characters + (gdb_completer_command_word_break_characters); } } else if (reason == handle_help) @@ -947,8 +958,8 @@ complete_line_internal (const char *text, p[-1]) == NULL; p--) ; - rl_completer_word_break_characters = - gdb_completer_file_name_break_characters; + set_rl_completer_word_break_characters + (gdb_completer_file_name_break_characters); } if (reason == handle_brkchars && c->completer_handle_brkchars != NULL) diff --git a/gdb/completer.h b/gdb/completer.h index 416b313..2aa1987 100644 --- a/gdb/completer.h +++ b/gdb/completer.h @@ -99,10 +99,16 @@ extern VEC (char_ptr) *reg_or_group_completer (struct cmd_list_element *, extern VEC (char_ptr) *reggroup_completer (struct cmd_list_element *, const char *, const char *); -extern char *get_gdb_completer_quote_characters (void); +extern const char *get_gdb_completer_quote_characters (void); extern char *gdb_completion_word_break_characters (void); +/* Set the word break characters array to BREAK_CHARS. This function + is useful as const-correct alternative to direct assignment to + rl_completer_word_break_characters, which is "char *", + not "const char *". */ +extern void set_rl_completer_word_break_characters (const char *break_chars); + /* Set the word break characters array to the corresponding set of chars, based on FN. This function is useful for cases when the completer doesn't know the type of the completion until some diff --git a/gdb/f-lang.c b/gdb/f-lang.c index 8aba5ef..3c30d75 100644 --- a/gdb/f-lang.c +++ b/gdb/f-lang.c @@ -203,7 +203,7 @@ f_language_arch_info (struct gdbarch *gdbarch, /* Remove the modules separator :: from the default break list. */ -static char * +static const char * f_word_break_characters (void) { static char *retval; diff --git a/gdb/language.c b/gdb/language.c index 119c07e..f1fc220 100644 --- a/gdb/language.c +++ b/gdb/language.c @@ -698,7 +698,7 @@ default_pass_by_reference (struct type *type) delimiting words. This is a reasonable default value that most languages should be able to use. */ -char * +const char * default_word_break_characters (void) { return " \t\n!@#$%^&*()+=|~`}{[]\"';:?/>.<,-"; diff --git a/gdb/language.h b/gdb/language.h index 3d21e4e..96080ac 100644 --- a/gdb/language.h +++ b/gdb/language.h @@ -321,7 +321,7 @@ struct language_defn char string_lower_bound; /* The list of characters forming word boundaries. */ - char *(*la_word_break_characters) (void); + const char *(*la_word_break_characters) (void); /* Should return a vector of all symbols which are possible completions for TEXT. WORD is the entire command on which the @@ -583,7 +583,7 @@ extern char *language_class_name_from_physname (const struct language_defn *, const char *physname); /* Splitting strings into words. */ -extern char *default_word_break_characters (void); +extern const char *default_word_break_characters (void); /* Print the index of an array element using the C99 syntax. */ extern void default_print_array_index (struct value *index_value, diff --git a/gdb/top.c b/gdb/top.c index 295b680..4a22be1 100644 --- a/gdb/top.c +++ b/gdb/top.c @@ -2022,7 +2022,7 @@ init_main (void) /* Setup important stuff for command line editing. */ rl_completion_word_break_hook = gdb_completion_word_break_characters; rl_completion_entry_function = readline_line_completion_function; - rl_completer_word_break_characters = default_word_break_characters (); + set_rl_completer_word_break_characters (default_word_break_characters ()); rl_completer_quote_characters = get_gdb_completer_quote_characters (); rl_completion_display_matches_hook = cli_display_match_list; rl_readline_name = "gdb";