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Refactor to avoid nonnull checks on "this" pointer. 

G++ 6.0 asserts that the "this" pointer is non-null for member
functions.
Refactor methods that check if "this" is non-null to resolve this.

winsup/cygwin/ChangeLog:
external.cc (cygwin_internal): Check for a null pinfo before calling
cmdline.
fhandler_dsp.cc (Audio::blockSize): Make static.
fhandler_dsp.cc (Audio_in): add default_buf_info.
fhandler_dsp.cc (Audio_out): Ditto.
fhandler_dsp.cc (Audio_out::buf_info): Refactor method to call
default_buf_info if dev_ is null.
fhandler_dsp.cc (Audio_in::buf_info): Ditto.
fhandler_dsp.cc (fhandler_dev_dsp::_ioctl): Call Audio_out::default_buf_info if audio_out_ is null.
fhandler_dsp.cc (fhandler_dev_dsp::_ioctl): Call Audio_in::default_buf_info if audio_in_ is null.
fhandler_process.cc (format_process_fd): Check if pinfo is null.
fhandler_process.cc (format_process_root): Ditto.
fhandler_process.cc (format_process_cwd): Ditto.
fhandler_process.cc (format_process_cmdline): Ditto.
signal.cc (tty_min::kill_pgrp): Ditto.
signal.cc (_pinfo::kill0): Ditto.
sigproc.cc (pid_exists): Ditto.
sigproc.cc (remove_proc): Ditto.
times.cc (clock_gettime): Ditto.
times.cc (clock_getcpuclockid): Ditto.
path.cc (cwdstuff::override_win32_cwd): Check if old_cwd is null.
path.cc (fcwd_access_t::Free): Factor null check of "this" out to
caller(s).
pinfo.cc (_pinfo::exists): Ditto.
pinfo.cc (_pinfo::fd): Ditto.
pinfo.cc (_pinfo::fds): Ditto.
pinfo.cc (_pinfo::root): Ditto.
pinfo.cc (_pinfo::cwd): Ditto.
pinfo.cc (_pinfo::cmdline): Ditto.
signal.cc (_pinfo::kill): Ditto.
pinfo.cc (_pinfo::commune_request): remove non-null check on "this", as
this method is only called from pinfo.cc after null checks
pinfo.cc (_pinfo::pipe_fhandler): remove non-null check on "this", as
this method is only called from pipe.cc (fhandler_pipe::open) after a null check.

Signed-off-by: Peter Foley <pefoley2@pefoley.com>
This commit is contained in:
Peter Foley 2016-04-02 11:36:18 -04:00 committed by Corinna Vinschen
parent e7e6119241
commit 0008bdea02
9 changed files with 75 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
winsup/cygwin/external.cc
View File

@ -342,7 +342,7 @@ cygwin_internal (cygwin_getinfo_types t, ...)
size_t n;
pid_t pid = va_arg (arg, pid_t);
pinfo p (pid);
res = (uintptr_t) p->cmdline (n);
res = p ? (uintptr_t) p->cmdline (n) : 0;
}
break;
case CW_CHECK_NTSEC:

55
winsup/cygwin/fhandler_dsp.cc
View File

@ -65,7 +65,7 @@ class fhandler_dev_dsp::Audio
void convert_S16LE_S16BE (unsigned char *buffer, int size_bytes);
void fillFormat (WAVEFORMATEX * format,
int rate, int bits, int channels);
unsigned blockSize (int rate, int bits, int channels);
static unsigned blockSize (int rate, int bits, int channels);
void (fhandler_dev_dsp::Audio::*convert_)
(unsigned char *buffer, int size_bytes);
@ -117,6 +117,7 @@ class fhandler_dev_dsp::Audio_out: public Audio
void stop (bool immediately = false);
int write (const char *pSampleData, int nBytes);
void buf_info (audio_buf_info *p, int rate, int bits, int channels);
static void default_buf_info (audio_buf_info *p, int rate, int bits, int channels);
void callback_sampledone (WAVEHDR *pHdr);
bool parsewav (const char *&pData, int &nBytes,
int rate, int bits, int channels);
@ -151,6 +152,7 @@ public:
void stop ();
bool read (char *pSampleData, int &nBytes);
void buf_info (audio_buf_info *p, int rate, int bits, int channels);
static void default_buf_info (audio_buf_info *p, int rate, int bits, int channels);
void callback_blockfull (WAVEHDR *pHdr);
private:
@ -501,11 +503,11 @@ void
fhandler_dev_dsp::Audio_out::buf_info (audio_buf_info *p,
int rate, int bits, int channels)
{
p->fragstotal = MAX_BLOCKS;
if (this && dev_)
if (dev_)
{
/* If the device is running we use the internal values,
possibly set from the wave file. */
p->fragstotal = MAX_BLOCKS;
p->fragsize = blockSize (freq_, bits_, channels_);
p->fragments = Qisr2app_->query ();
if (pHdr_ != NULL)
@ -516,10 +518,17 @@ fhandler_dev_dsp::Audio_out::buf_info (audio_buf_info *p,
}
else
{
default_buf_info(p, rate, bits, channels);
}
}
void fhandler_dev_dsp::Audio_out::default_buf_info (audio_buf_info *p,
int rate, int bits, int channels)
{
p->fragstotal = MAX_BLOCKS;
p->fragsize = blockSize (rate, bits, channels);
p->fragments = MAX_BLOCKS;
p->bytes = p->fragsize * p->fragments;
}
}
/* This is called on an interupt so use locking.. Note Qisr2app_
@ -953,14 +962,23 @@ fhandler_dev_dsp::Audio_in::waitfordata ()
return true;
}
void fhandler_dev_dsp::Audio_in::default_buf_info (audio_buf_info *p,
int rate, int bits, int channels)
{
p->fragstotal = MAX_BLOCKS;
p->fragsize = blockSize (rate, bits, channels);
p->fragments = 0;
p->bytes = 0;
}
void
fhandler_dev_dsp::Audio_in::buf_info (audio_buf_info *p,
int rate, int bits, int channels)
{
p->fragstotal = MAX_BLOCKS;
p->fragsize = blockSize (rate, bits, channels);
if (this && dev_)
if (dev_)
{
p->fragstotal = MAX_BLOCKS;
p->fragsize = blockSize (rate, bits, channels);
p->fragments = Qisr2app_->query ();
if (pHdr_ != NULL)
p->bytes = pHdr_->dwBytesRecorded - bufferIndex_
@ -970,8 +988,7 @@ fhandler_dev_dsp::Audio_in::buf_info (audio_buf_info *p,
}
else
{
p->fragments = 0;
p->bytes = 0;
default_buf_info(p, rate, bits, channels);
}
}
@ -1345,9 +1362,13 @@ fhandler_dev_dsp::_ioctl (unsigned int cmd, void *buf)
return -1;
}
audio_buf_info *p = (audio_buf_info *) buf;
audio_out_->buf_info (p, audiofreq_, audiobits_, audiochannels_);
debug_printf ("buf=%p frags=%d fragsize=%d bytes=%d",
buf, p->fragments, p->fragsize, p->bytes);
if (audio_out_) {
audio_out_->buf_info (p, audiofreq_, audiobits_, audiochannels_);
} else {
Audio_out::default_buf_info(p, audiofreq_, audiobits_, audiochannels_);
}
debug_printf ("buf=%p frags=%d fragsize=%d bytes=%d",
buf, p->fragments, p->fragsize, p->bytes);
return 0;
}
@ -1359,9 +1380,13 @@ fhandler_dev_dsp::_ioctl (unsigned int cmd, void *buf)
return -1;
}
audio_buf_info *p = (audio_buf_info *) buf;
audio_in_->buf_info (p, audiofreq_, audiobits_, audiochannels_);
debug_printf ("buf=%p frags=%d fragsize=%d bytes=%d",
buf, p->fragments, p->fragsize, p->bytes);
if (audio_in_) {
audio_in_->buf_info (p, audiofreq_, audiobits_, audiochannels_);
} else {
Audio_in::default_buf_info(p, audiofreq_, audiobits_, audiochannels_);
}
debug_printf ("buf=%p frags=%d fragsize=%d bytes=%d",
buf, p->fragments, p->fragsize, p->bytes);
return 0;
}

11
winsup/cygwin/fhandler_process.cc
View File

@ -371,6 +371,11 @@ format_process_fd (void *data, char *&destbuf)
case a trailing slash and more followup chars are allowed, provided the
descriptor symlink points to a directory. */
char *fdp = strchr (path, '/') + 3;
if (!p)
{
set_errno (ENOENT);
return 0;
}
/* The "fd" directory itself? */
if (fdp[0] =='\0' || (fdp[0] == '/' && fdp[1] == '\0'))
{
@ -479,7 +484,7 @@ format_process_root (void *data, char *&destbuf)
cfree (destbuf);
destbuf = NULL;
}
destbuf = p->root (fs);
destbuf = p ? p->root (fs) : NULL;
if (!destbuf || !*destbuf)
{
destbuf = cstrdup ("<defunct>");
@ -499,7 +504,7 @@ format_process_cwd (void *data, char *&destbuf)
cfree (destbuf);
destbuf = NULL;
}
destbuf = p->cwd (fs);
destbuf = p ? p->cwd (fs) : NULL;
if (!destbuf || !*destbuf)
{
destbuf = cstrdup ("<defunct>");
@ -519,7 +524,7 @@ format_process_cmdline (void *data, char *&destbuf)
cfree (destbuf);
destbuf = NULL;
}
destbuf = p->cmdline (fs);
destbuf = p ? p->cmdline (fs) : NULL;
if (!destbuf || !*destbuf)
{
destbuf = cstrdup ("<defunct>");

2
winsup/cygwin/fhandler_termios.cc
View File

@ -134,7 +134,7 @@ tty_min::kill_pgrp (int sig)
for (unsigned i = 0; i < pids.npids; i++)
{
_pinfo *p = pids[i];
if (!p->exists () || p->ctty != ntty || p->pgid != pgid)
if (!p || !p->exists () || p->ctty != ntty || p->pgid != pgid)
continue;
if (p == myself)
killself = sig != __SIGSETPGRP && !exit_state;

5
winsup/cygwin/path.cc
View File

@ -3932,7 +3932,7 @@ fcwd_access_t::Free (PVOID heap)
{
/* Decrement the reference count. If it's down to 0, free
structure from heap. */
if (this && InterlockedDecrement (&ReferenceCount ()) == 0)
if (InterlockedDecrement (&ReferenceCount ()) == 0)
{
/* In contrast to pre-Vista, the handle on init is always a
fresh one and not the handle inherited from the parent
@ -4320,7 +4320,8 @@ cwdstuff::override_win32_cwd (bool init, ULONG old_dismount_count)
f_cwd->CopyPath (upp_cwd_str);
upp_cwd_hdl = dir;
RtlLeaveCriticalSection (peb.FastPebLock);
old_cwd->Free (heap);
if (old_cwd)
old_cwd->Free (heap);
}
else
{

16
winsup/cygwin/pinfo.cc
View File

@ -514,7 +514,7 @@ _pinfo::set_ctty (fhandler_termios *fh, int flags)
bool __reg1
_pinfo::exists ()
{
return this && process_state && !(process_state & (PID_EXITED | PID_REAPED | PID_EXECED));
return process_state && !(process_state & (PID_EXITED | PID_REAPED | PID_EXECED));
}
bool
@ -685,7 +685,7 @@ _pinfo::commune_request (__uint32_t code, ...)
res.s = NULL;
res.n = 0;
if (!this || !pid)
if (!pid)
{
set_errno (ESRCH);
goto err;
@ -783,7 +783,7 @@ out:
fhandler_pipe *
_pinfo::pipe_fhandler (int64_t unique_id, size_t &n)
{
if (!this || !pid)
if (!pid)
return NULL;
if (pid == myself->pid)
return NULL;
@ -796,7 +796,7 @@ char *
_pinfo::fd (int fd, size_t &n)
{
char *s;
if (!this || !pid)
if (!pid)
return NULL;
if (pid != myself->pid)
{
@ -820,7 +820,7 @@ char *
_pinfo::fds (size_t &n)
{
char *s;
if (!this || !pid)
if (!pid)
return NULL;
if (pid != myself->pid)
{
@ -848,7 +848,7 @@ char *
_pinfo::root (size_t& n)
{
char *s;
if (!this || !pid)
if (!pid)
return NULL;
if (pid != myself->pid && !ISSTATE (this, PID_NOTCYGWIN))
{
@ -893,7 +893,7 @@ char *
_pinfo::cwd (size_t& n)
{
char *s = NULL;
if (!this || !pid)
if (!pid)
return NULL;
if (ISSTATE (this, PID_NOTCYGWIN))
{
@ -939,7 +939,7 @@ char *
_pinfo::cmdline (size_t& n)
{
char *s = NULL;
if (!this || !pid)
if (!pid)
return NULL;
if (ISSTATE (this, PID_NOTCYGWIN))
{

12
winsup/cygwin/signal.cc
View File

@ -263,7 +263,7 @@ _pinfo::kill (siginfo_t& si)
}
this_pid = pid;
}
else if (si.si_signo == 0 && this && process_state == PID_EXITED)
else if (si.si_signo == 0 && process_state == PID_EXITED)
{
this_process_state = process_state;
this_pid = pid;
@ -299,8 +299,12 @@ kill0 (pid_t pid, siginfo_t& si)
syscall_printf ("signal %d out of range", si.si_signo);
return -1;
}
return (pid > 0) ? pinfo (pid)->kill (si) : kill_pgrp (-pid, si);
if (pid > 0) {
pinfo p(pid);
return p && p->kill(si);
} else {
return kill_pgrp(-pid, si);
}
}
int
@ -326,7 +330,7 @@ kill_pgrp (pid_t pid, siginfo_t& si)
{
_pinfo *p = pids[i];
if (!p->exists ())
if (!p || !p->exists ())
continue;
/* Is it a process we want to kill? */

5
winsup/cygwin/sigproc.cc
View File

@ -155,7 +155,8 @@ proc_can_be_signalled (_pinfo *p)
bool __reg1
pid_exists (pid_t pid)
{
return pinfo (pid)->exists ();
pinfo p(pid);
return p && p->exists ();
}
/* Return true if this is one of our children, false otherwise. */
@ -1143,7 +1144,7 @@ remove_proc (int ci)
if (_my_tls._ctinfo != procs[ci].wait_thread)
procs[ci].wait_thread->terminate_thread ();
}
else if (procs[ci]->exists ())
else if (procs[ci] && procs[ci]->exists ())
return true;
sigproc_printf ("removing procs[%d], pid %d, nprocs %d", ci, procs[ci]->pid,

5
winsup/cygwin/times.cc
View File

@ -542,7 +542,7 @@ clock_gettime (clockid_t clk_id, struct timespec *tp)
pid = getpid ();
pinfo p (pid);
if (!p->exists ())
if (!p || !p->exists ())
{
set_errno (EINVAL);
return -1;
@ -765,7 +765,8 @@ clock_setres (clockid_t clk_id, struct timespec *tp)
extern "C" int
clock_getcpuclockid (pid_t pid, clockid_t *clk_id)
{
if (pid != 0 && !pinfo (pid)->exists ())
pinfo p(pid);
if (pid != 0 && (!p || !p->exists ()))
return (ESRCH);
*clk_id = (clockid_t) PID_TO_CLOCKID (pid);
return 0;