external/cde
1
0
Fork 0
mirror of git://git.code.sf.net/p/cdesktopenv/code synced 2025-03-09 15:50:02 +00:00
Code Issues Releases Wiki Activity

Introduce usage of __builtin_unreachable() and noreturn (#248)

Browse source 
This commit adds an UNREACHABLE() macro that expands to either the
__builtin_unreachable() compiler builtin (for release builds) or
abort(3) (for development builds). This is used to mark code paths
that are never to be reached.

It also adds the 'noreturn' attribute to functions that never
return: path_exec(), sh_done() and sh_syntax(). The UNREACHABLE()
macro is not added after calling these.

The purpose of these is:
* to slightly improve GCC/Clang compiler optimizations;
* to fix a few compiler warnings;
* to add code clarity.

Changes of note:

src/cmd/ksh93/sh/io.c: outexcept():
- Avoid using __builtin_unreachable() here since errormsg can
  return despite using ERROR_system(1), as shp->jmplist->mode is
  temporarily set to 0. See: https://github.com/att/ast/issues/1336

src/cmd/ksh93/tests/io.sh:
- Add a regression test for the ksh2020 bug referenced above.

src/lib/libast/features/common:
- Detect the existence of either the C11 stdnoreturn.h header or
  the GCC noreturn attribute, preferring the former when available.
- Test for the existence of __builtin_unreachable(). Use it for
  release builds. On development builds, use abort() instead, which
  crahses reliably for debugging when unreachable code is reached.

Co-authored-by: Martijn Dekker <martijn@inlv.org>
This commit is contained in:
Johnothan King 2021-04-04 16:28:24 -07:00 • committed by GitHub
parent 56913f8c2a
commit c4f980eb29
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
87 changed files with 1170 additions and 122 deletions
Download patch file Download diff file Expand all files Collapse all files

39
src/lib/libcmd/stty.c
View file

@ -645,14 +645,23 @@ static void set(char *argv[], struct termios *sp)
off=1;
}
if(!(tp=lookup(cp)) || (off && (tp->type!=BIT) && (tp->type!=TABS)))
{
error(ERROR_exit(1),"%s: unknown mode",cp);
UNREACHABLE();
}
switch(tp->type)
{
case CHAR:
if(off)
{
error(ERROR_exit(1),"%s: unknown mode",cp);
UNREACHABLE();
}
if(!*argv)
{
error(ERROR_exit(1),"missing argument to %s",cp);
UNREACHABLE();
}
c = gettchar(*argv++);
if(c>=0)
sp->c_cc[tp->mask] = c;
@ -697,7 +706,10 @@ static void set(char *argv[], struct termios *sp)
struct winsize win;
int n;
if(ioctl(0,TIOCGWINSZ,&win)<0)
{
error(ERROR_system(1),"cannot set %s",tp->name);
UNREACHABLE();
}
if(!(cp= *argv))
{
sfprintf(sfstdout,"%d\n",tp->mask?win.ws_col:win.ws_row);
@ -706,13 +718,19 @@ static void set(char *argv[], struct termios *sp)
argv++;
n=strtol(cp,&cp,10);
if(*cp)
{
error(ERROR_system(1),"%d: invalid number of %s",argv[-1],tp->name);
UNREACHABLE();
}
if(tp->mask)
win.ws_col = n;
else
win.ws_row = n;
if(ioctl(0,TIOCSWINSZ,&win)<0)
{
error(ERROR_system(1),"cannot set %s",tp->name);
UNREACHABLE();
}
break;
}
#endif
@ -727,11 +745,15 @@ static void set(char *argv[], struct termios *sp)
break;
}
error(ERROR_exit(1), "%s: missing numeric argument", tp->name);
UNREACHABLE();
}
argv++;
c = (int)strtol(cp, &ep, 10);
if (*ep)
{
error(ERROR_exit(1), "%s: %s: numeric argument expected", tp->name, cp);
UNREACHABLE();
}
switch (tp->field)
{
#if _mem_c_line_termios
@ -748,7 +770,10 @@ static void set(char *argv[], struct termios *sp)
cfsetospeed(sp, c);
}
else
{
error(ERROR_exit(1), "%s: %s: invalid speed", tp->name, cp);
UNREACHABLE();
}
break;
case T_CHAR:
sp->c_cc[tp->mask] = c;
@ -941,19 +966,28 @@ b_stty(int argc, char** argv, Shbltin_t* context)
if (!opt_info.offset)
error(2, "%s", opt_info.arg);
else if (!(tp = lookup(argv[opt_info.index]+1)) || (tp->type != BIT && tp->type != TABS))
{
error(ERROR_exit(1), "%s: unknown mode", argv[opt_info.index]);
UNREACHABLE();
}
break;
case '?':
error(ERROR_usage(2), "%s", opt_info.arg);
break;
UNREACHABLE();
}
break;
}
argv += opt_info.index;
if (error_info.errors || (flags && *argv) || (flags&(flags-1)))
{
error(ERROR_usage(2), "%s", optusage(NiL));
UNREACHABLE();
}
if (tcgetattr(fd, &tty) < 0)
{
error(ERROR_system(1), "not a tty");
UNREACHABLE();
}
if (flags & T_FLAG)
sfprintf(sfstdout, "%d\n", tcgetpgrp(0));
else if (*argv)
@ -963,7 +997,10 @@ b_stty(int argc, char** argv, Shbltin_t* context)
else
set(argv, &tty);
if (tcsetattr(0, TCSANOW, &tty) < 0)
{
error(ERROR_system(1), "cannot set tty");
UNREACHABLE();
}
}
else
output(&tty, flags);