public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
From: "visenri at yahoo dot es" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/59773] New: Mixing pointers to different memory spaces shows no warning (gcc for AVR) Date: Sun, 12 Jan 2014 00:28:00 -0000 [thread overview] Message-ID: <bug-59773-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59773 Bug ID: 59773 Summary: Mixing pointers to different memory spaces shows no warning (gcc for AVR) Product: gcc Version: 4.7.2 Status: UNCONFIRMED Severity: major Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: visenri at yahoo dot es I'll explain it with an example. Having these strings declared: const char __flash strF[] = "Flash"; const char strR[] = "RAM"; And a function with a 24 bit flat pointer like this: Foo( const char __memx * str ); Calling it like this is ok (16 bit pointer is enlarged to 24 generating correct code): Foo(strF); Foo(strR); But using functions with 16 bit pointer: FooR( const char * str ); //16 bit pointer to RAM FooF( const char _flash * str ); //16 bit pointer to FLASH And these variables: const char __memx * pstr; const char * pstrR; const char __flash * pstrF; These lines should show at least a warning: FooR(strF); // same size, different memory space FooF(strR); // same size, different memory space FooR(pstr); // pstr is 24 bit, bigger than 16 bit ram pointer in function FooF(pstr); // pstr is 24 bit, bigger than 16 bit flash pointer in function pstrR = strF; // same size, different memory space pstrF = strR; // same size, different memory space pstrR = pstr; // pstr is 24 bit, bigger than 16 bit ram pointer pstrF = pstr; // pstr is 24 bit, bigger than 16 bit flash pointer Because we are going to use a ROM/FLASH pointer as a RAM pointer or the other way.
next reply other threads:[~2014-01-12 0:28 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-01-12 0:28 visenri at yahoo dot es [this message] 2014-01-15 13:56 ` [Bug target/59773] " gjl at gcc dot gnu.org
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=bug-59773-4@http.gcc.gnu.org/bugzilla/ \ --to=gcc-bugzilla@gcc.gnu.org \ --cc=gcc-bugs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).