target_pass_signals/target_program_signals: Use gdb::array_view

This replaces the pointer and length parameters of target_pass_signals
and target_program_signals with a gdb::array_view parameter, and fixes
the fallout.

In infrun.c, the signal_stop, signal_print, signal_program,
signal_catch, signal_pass globals are currently pointers to
heap-allocated memory.  I see no point in that, so I converted them to
arrays.  This allows simplifying the calls to
target_pass_signals/target_program_signals, since we can pass the
array directly, which can implicitly convert to gdb::array_view.

gdb/ChangeLog:
2019-01-24  Pedro Alves  <palves@redhat.com>

	* infrun.c (signal_stop, signal_print, signal_program)
	(signal_catch, signal_pass): Now arrays instead of pointers.
	(update_signals_program_target, do_target_resume)
	(signal_catch_update, handle_command, _initialize_infrun): Adjust.
	* linux-nat.c (linux_nat_target::pass_signals)
	(linux_nat_target::create_inferior, linux_nat_target::attach):
	Adjust.
	* linux-nat.h (linux_nat_target::pass_signals): Adjust.
	* nto-procfs.c (nto_procfs_target::pass_signals): Adjust.
	* procfs.c (procfs_target::pass_signals): Adjust.
	* record-full.c (record_full_target::resume): Adjust.
	* remote.c (remote_target::pass_signals)
	(remote_target::program_signals): Adjust.
	* target-debug.h (target_debug_print_signals): Now takes a
	gdb::array_view as parameter.  Adjust.
	* target.h (target_ops) <pass_signals, program_signals>: Replace
	pointer and length parameters with gdb::array_view.
	(target_pass_signals, target_program_signals): Likewise.
	* target-delegates.c: Regenerate.

gdb/ChangeLog

@@ -1,3 +1,25 @@
+2019-01-24  Pedro Alves  <palves@redhat.com>
+
+	* infrun.c (signal_stop, signal_print, signal_program)
+	(signal_catch, signal_pass): Now arrays instead of pointers.
+	(update_signals_program_target, do_target_resume)
+	(signal_catch_update, handle_command, _initialize_infrun): Adjust.
+	* linux-nat.c (linux_nat_target::pass_signals)
+	(linux_nat_target::create_inferior, linux_nat_target::attach):
+	Adjust.
+	* linux-nat.h (linux_nat_target::pass_signals): Adjust.
+	* nto-procfs.c (nto_procfs_target::pass_signals): Adjust.
+	* procfs.c (procfs_target::pass_signals): Adjust.
+	* record-full.c (record_full_target::resume): Adjust.
+	* remote.c (remote_target::pass_signals)
+	(remote_target::program_signals): Adjust.
+	* target-debug.h (target_debug_print_signals): Now takes a
+	gdb::array_view as parameter.  Adjust.
+	* target.h (target_ops) <pass_signals, program_signals>: Replace
+	pointer and length parameters with gdb::array_view.
+	(target_pass_signals, target_program_signals): Likewise.
+	* target-delegates.c: Regenerate.
+
 2019-01-24  Pedro Alves  <palves@redhat.com>
 
 	* common/forward-scope-exit.h

gdb/infrun.c

@@ -306,20 +306,19 @@ update_observer_mode (void)
 
 /* Tables of how to react to signals; the user sets them.  */
 
-static unsigned char *signal_stop;
+static unsigned char signal_stop[GDB_SIGNAL_LAST];
-static unsigned char *signal_print;
+static unsigned char signal_print[GDB_SIGNAL_LAST];
-static unsigned char *signal_program;
+static unsigned char signal_program[GDB_SIGNAL_LAST];
 
 /* Table of signals that are registered with "catch signal".  A
    non-zero entry indicates that the signal is caught by some "catch
-   signal" command.  This has size GDB_SIGNAL_LAST, to accommodate all
+   signal" command.  */
-   signals.  */
+static unsigned char signal_catch[GDB_SIGNAL_LAST];
-static unsigned char *signal_catch;
 
 /* Table of signals that the target may silently handle.
    This is automatically determined from the flags above,
    and simply cached here.  */
-static unsigned char *signal_pass;
+static unsigned char signal_pass[GDB_SIGNAL_LAST];
 
 #define SET_SIGS(nsigs,sigs,flags) \
   do { \
@@ -343,7 +342,7 @@ static unsigned char *signal_pass;
 void
 update_signals_program_target (void)
 {
-  target_program_signals ((int) GDB_SIGNAL_LAST, signal_program);
+  target_program_signals (signal_program);
 }
 
 /* Value to pass to target_resume() to cause all threads to resume.  */
@@ -2219,9 +2218,9 @@ do_target_resume (ptid_t resume_ptid, int step, enum gdb_signal sig)
        valid.  */
   if (step_over_info_valid_p ()
       || displaced_step_in_progress (tp->inf))
-    target_pass_signals (0, NULL);
+    target_pass_signals ({});
   else
-    target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass);
+    target_pass_signals (signal_pass);
 
   target_resume (resume_ptid, step, sig);
 
@@ -8251,7 +8250,7 @@ signal_catch_update (const unsigned int *info)
   for (i = 0; i < GDB_SIGNAL_LAST; ++i)
     signal_catch[i] = info[i] > 0;
   signal_cache_update (-1);
-  target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass);
+  target_pass_signals (signal_pass);
 }
 
 static void
@@ -8287,8 +8286,6 @@ handle_command (const char *args, int from_tty)
   int sigfirst, siglast;
   enum gdb_signal oursig;
   int allsigs;
-  int nsigs;
-  unsigned char *sigs;
 
   if (args == NULL)
     {
@@ -8297,9 +8294,8 @@ handle_command (const char *args, int from_tty)
 
   /* Allocate and zero an array of flags for which signals to handle.  */
 
-  nsigs = (int) GDB_SIGNAL_LAST;
+  const size_t nsigs = GDB_SIGNAL_LAST;
-  sigs = (unsigned char *) alloca (nsigs);
+  unsigned char sigs[nsigs] {};
-  memset (sigs, 0, nsigs);
 
   /* Break the command line up into args.  */
 
@@ -8436,8 +8432,8 @@ Are you sure you want to change it? "),
     if (sigs[signum])
       {
 	signal_cache_update (-1);
-	target_pass_signals ((int) GDB_SIGNAL_LAST, signal_pass);
+	target_pass_signals (signal_pass);
-	target_program_signals ((int) GDB_SIGNAL_LAST, signal_program);
+	target_program_signals (signal_program);
 
 	if (from_tty)
 	  {
@@ -8963,8 +8959,6 @@ infrun_async_inferior_event_handler (gdb_client_data data)
 void
 _initialize_infrun (void)
 {
-  int i;
-  int numsigs;
   struct cmd_list_element *c;
 
   /* Register extra event sources in the event loop.  */
@@ -9046,13 +9040,7 @@ leave it stopped or free to run as needed."),
 			   &setlist,
 			   &showlist);
 
-  numsigs = (int) GDB_SIGNAL_LAST;
+  for (size_t i = 0; i < GDB_SIGNAL_LAST; i++)
-  signal_stop = XNEWVEC (unsigned char, numsigs);
-  signal_print = XNEWVEC (unsigned char, numsigs);
-  signal_program = XNEWVEC (unsigned char, numsigs);
-  signal_catch = XNEWVEC (unsigned char, numsigs);
-  signal_pass = XNEWVEC (unsigned char, numsigs);
-  for (i = 0; i < numsigs; i++)
     {
       signal_stop[i] = 1;
       signal_print[i] = 1;

gdb/linux-nat.c

@@ -789,7 +789,8 @@ static sigset_t pass_mask;
 
 /* Update signals to pass to the inferior.  */
 void
-linux_nat_target::pass_signals (int numsigs, const unsigned char *pass_signals)
+linux_nat_target::pass_signals
+  (gdb::array_view<const unsigned char> pass_signals)
 {
   int signo;
 
@@ -798,7 +799,7 @@ linux_nat_target::pass_signals (int numsigs, const unsigned char *pass_signals)
   for (signo = 1; signo < NSIG; signo++)
     {
       int target_signo = gdb_signal_from_host (signo);
-      if (target_signo < numsigs && pass_signals[target_signo])
+      if (target_signo < pass_signals.size () && pass_signals[target_signo])
         sigaddset (&pass_mask, signo);
     }
 }
@@ -1096,7 +1097,7 @@ linux_nat_target::create_inferior (const char *exec_file,
      we have to mask the async mode.  */
 
   /* Make sure we report all signals during startup.  */
-  pass_signals (0, NULL);
+  pass_signals ({});
 
   inf_ptrace_target::create_inferior (exec_file, allargs, env, from_tty);
 }
@@ -1186,7 +1187,7 @@ linux_nat_target::attach (const char *args, int from_tty)
   ptid_t ptid;
 
   /* Make sure we report all signals during attach.  */
-  pass_signals (0, NULL);
+  pass_signals ({});
 
   TRY
     {

gdb/linux-nat.h

@@ -45,7 +45,7 @@ public:
 
   ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
 
-  void pass_signals (int, const unsigned char *) override;
+  void pass_signals (gdb::array_view<const unsigned char>) override;
 
   enum target_xfer_status xfer_partial (enum target_object object,
 					const char *annex,

gdb/nto-procfs.c

@@ -109,7 +109,7 @@ struct nto_procfs_target : public inf_child_target
 
   void mourn_inferior () override;
 
-  void pass_signals (int, const unsigned char *) override;
+  void pass_signals (gdb::array_view<const unsigned char>) override;
 
   bool thread_alive (ptid_t ptid) override;
 
@@ -1442,8 +1442,8 @@ nto_procfs_target::store_registers (struct regcache *regcache, int regno)
 /* Set list of signals to be handled in the target.  */
 
 void
-nto_procfs_target::pass_signals (int numsigs,
+nto_procfs_target::pass_signals
-				 const unsigned char *pass_signals)
+  (gdb::array_view<const unsigned char> pass_signals)
 {
   int signo;
 
@@ -1452,7 +1452,7 @@ nto_procfs_target::pass_signals (int numsigs,
   for (signo = 1; signo < NSIG; signo++)
     {
       int target_signo = gdb_signal_from_host (signo);
-      if (target_signo < numsigs && pass_signals[target_signo])
+      if (target_signo < pass_signals.size () && pass_signals[target_signo])
         sigdelset (&run.trace, signo);
     }
 }

gdb/procfs.c

@@ -119,7 +119,7 @@ public:
 					ULONGEST offset, ULONGEST len,
 					ULONGEST *xfered_len) override;
 
-  void pass_signals (int, const unsigned char *) override;
+  void pass_signals (gdb::array_view<const unsigned char>) override;
 
   void files_info () override;
 
@@ -2772,7 +2772,7 @@ procfs_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
 /* Set up to trace signals in the child process.  */
 
 void
-procfs_target::pass_signals (int numsigs, const unsigned char *pass_signals)
+procfs_target::pass_signals (gdb::array_view<const unsigned char> pass_signals)
 {
   sigset_t signals;
   procinfo *pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
@@ -2783,7 +2783,7 @@ procfs_target::pass_signals (int numsigs, const unsigned char *pass_signals)
   for (signo = 0; signo < NSIG; signo++)
     {
       int target_signo = gdb_signal_from_host (signo);
-      if (target_signo < numsigs && pass_signals[target_signo])
+      if (target_signo < pass_signals.size () && pass_signals[target_signo])
 	prdelset (&signals, signo);
     }
 

gdb/record-full.c

@@ -1098,7 +1098,7 @@ record_full_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
         }
 
       /* Make sure the target beneath reports all signals.  */
-      target_pass_signals (0, NULL);
+      target_pass_signals ({});
 
       this->beneath ()->resume (ptid, step, signal);
     }

gdb/remote.c

@@ -472,12 +472,12 @@ public:
 
   void mourn_inferior () override;
 
-  void pass_signals (int, const unsigned char *) override;
+  void pass_signals (gdb::array_view<const unsigned char>) override;
 
   int set_syscall_catchpoint (int, bool, int,
 			      gdb::array_view<const int>) override;
 
-  void program_signals (int, const unsigned char *) override;
+  void program_signals (gdb::array_view<const unsigned char>) override;
 
   bool thread_alive (ptid_t ptid) override;
 
@@ -2560,16 +2560,16 @@ record_currthread (struct remote_state *rs, ptid_t currthread)
    it can simply pass through to the inferior without reporting.  */
 
 void
-remote_target::pass_signals (int numsigs, const unsigned char *pass_signals)
+remote_target::pass_signals (gdb::array_view<const unsigned char> pass_signals)
 {
   if (packet_support (PACKET_QPassSignals) != PACKET_DISABLE)
     {
       char *pass_packet, *p;
-      int count = 0, i;
+      int count = 0;
       struct remote_state *rs = get_remote_state ();
 
-      gdb_assert (numsigs < 256);
+      gdb_assert (pass_signals.size () < 256);
-      for (i = 0; i < numsigs; i++)
+      for (size_t i = 0; i < pass_signals.size (); i++)
 	{
 	  if (pass_signals[i])
 	    count++;
@@ -2577,7 +2577,7 @@ remote_target::pass_signals (int numsigs, const unsigned char *pass_signals)
       pass_packet = (char *) xmalloc (count * 3 + strlen ("QPassSignals:") + 1);
       strcpy (pass_packet, "QPassSignals:");
       p = pass_packet + strlen (pass_packet);
-      for (i = 0; i < numsigs; i++)
+      for (size_t i = 0; i < pass_signals.size (); i++)
 	{
 	  if (pass_signals[i])
 	    {
@@ -2686,16 +2686,16 @@ remote_target::set_syscall_catchpoint (int pid, bool needed, int any_count,
    signals it should pass through to the inferior when detaching.  */
 
 void
-remote_target::program_signals (int numsigs, const unsigned char *signals)
+remote_target::program_signals (gdb::array_view<const unsigned char> signals)
 {
   if (packet_support (PACKET_QProgramSignals) != PACKET_DISABLE)
     {
       char *packet, *p;
-      int count = 0, i;
+      int count = 0;
       struct remote_state *rs = get_remote_state ();
 
-      gdb_assert (numsigs < 256);
+      gdb_assert (signals.size () < 256);
-      for (i = 0; i < numsigs; i++)
+      for (size_t i = 0; i < signals.size (); i++)
 	{
 	  if (signals[i])
 	    count++;
@@ -2703,7 +2703,7 @@ remote_target::program_signals (int numsigs, const unsigned char *signals)
       packet = (char *) xmalloc (count * 3 + strlen ("QProgramSignals:") + 1);
       strcpy (packet, "QProgramSignals:");
       p = packet + strlen (packet);
-      for (i = 0; i < numsigs; i++)
+      for (size_t i = 0; i < signals.size (); i++)
 	{
 	  if (signal_pass_state (i))
 	    {
@@ -4796,7 +4796,7 @@ remote_target::start_remote (int from_tty, int extended_p)
       gdb_assert (wait_status == NULL);
 
       /* Report all signals during attach/startup.  */
-      pass_signals (0, NULL);
+      pass_signals ({});
 
       /* If there are already stopped threads, mark them stopped and
 	 report their stops before giving the prompt to the user.  */

gdb/target-debug.h

@@ -209,20 +209,16 @@ target_debug_print_options (int options)
 }
 
 static void
-target_debug_print_signals (const unsigned char *sigs)
+target_debug_print_signals (gdb::array_view<const unsigned char> sigs)
 {
   fputs_unfiltered ("{", gdb_stdlog);
-  if (sigs != NULL)
-    {
-      int i;
 
-      for (i = 0; i < GDB_SIGNAL_LAST; i++)
+  for (size_t i = 0; i < sigs.size (); i++)
-	if (sigs[i])
+    if (sigs[i] != 0)
-	  {
+      {
-	    fprintf_unfiltered (gdb_stdlog, " %s",
+	fprintf_unfiltered (gdb_stdlog, " %s",
-				gdb_signal_to_name ((enum gdb_signal) i));
+			    gdb_signal_to_name ((enum gdb_signal) i));
-	  }
+      }
-    }
   fputs_unfiltered (" }", gdb_stdlog);
 }
 

gdb/target-delegates.c

@@ -62,8 +62,8 @@ struct dummy_target : public target_ops
   void follow_exec (struct inferior *arg0, char *arg1) override;
   int set_syscall_catchpoint (int arg0, bool arg1, int arg2, gdb::array_view<const int> arg3) override;
   void mourn_inferior () override;
-  void pass_signals (int arg0, const unsigned char * arg1) override;
+  void pass_signals (gdb::array_view<const unsigned char> arg0) override;
-  void program_signals (int arg0, const unsigned char * arg1) override;
+  void program_signals (gdb::array_view<const unsigned char> arg0) override;
   bool thread_alive (ptid_t arg0) override;
   void update_thread_list () override;
   const char *pid_to_str (ptid_t arg0) override;
@@ -229,8 +229,8 @@ struct debug_target : public target_ops
   void follow_exec (struct inferior *arg0, char *arg1) override;
   int set_syscall_catchpoint (int arg0, bool arg1, int arg2, gdb::array_view<const int> arg3) override;
   void mourn_inferior () override;
-  void pass_signals (int arg0, const unsigned char * arg1) override;
+  void pass_signals (gdb::array_view<const unsigned char> arg0) override;
-  void program_signals (int arg0, const unsigned char * arg1) override;
+  void program_signals (gdb::array_view<const unsigned char> arg0) override;
   bool thread_alive (ptid_t arg0) override;
   void update_thread_list () override;
   const char *pid_to_str (ptid_t arg0) override;
@@ -1659,48 +1659,44 @@ debug_target::mourn_inferior ()
 }
 
 void
-target_ops::pass_signals (int arg0, const unsigned char * arg1)
+target_ops::pass_signals (gdb::array_view<const unsigned char> arg0)
 {
-  this->beneath ()->pass_signals (arg0, arg1);
+  this->beneath ()->pass_signals (arg0);
 }
 
 void
-dummy_target::pass_signals (int arg0, const unsigned char * arg1)
+dummy_target::pass_signals (gdb::array_view<const unsigned char> arg0)
 {
 }
 
 void
-debug_target::pass_signals (int arg0, const unsigned char * arg1)
+debug_target::pass_signals (gdb::array_view<const unsigned char> arg0)
 {
   fprintf_unfiltered (gdb_stdlog, "-> %s->pass_signals (...)\n", this->beneath ()->shortname ());
-  this->beneath ()->pass_signals (arg0, arg1);
+  this->beneath ()->pass_signals (arg0);
   fprintf_unfiltered (gdb_stdlog, "<- %s->pass_signals (", this->beneath ()->shortname ());
-  target_debug_print_int (arg0);
+  target_debug_print_signals (arg0);
-  fputs_unfiltered (", ", gdb_stdlog);
-  target_debug_print_signals (arg1);
   fputs_unfiltered (")\n", gdb_stdlog);
 }
 
 void
-target_ops::program_signals (int arg0, const unsigned char * arg1)
+target_ops::program_signals (gdb::array_view<const unsigned char> arg0)
 {
-  this->beneath ()->program_signals (arg0, arg1);
+  this->beneath ()->program_signals (arg0);
 }
 
 void
-dummy_target::program_signals (int arg0, const unsigned char * arg1)
+dummy_target::program_signals (gdb::array_view<const unsigned char> arg0)
 {
 }
 
 void
-debug_target::program_signals (int arg0, const unsigned char * arg1)
+debug_target::program_signals (gdb::array_view<const unsigned char> arg0)
 {
   fprintf_unfiltered (gdb_stdlog, "-> %s->program_signals (...)\n", this->beneath ()->shortname ());
-  this->beneath ()->program_signals (arg0, arg1);
+  this->beneath ()->program_signals (arg0);
   fprintf_unfiltered (gdb_stdlog, "<- %s->program_signals (", this->beneath ()->shortname ());
-  target_debug_print_int (arg0);
+  target_debug_print_signals (arg0);
-  fputs_unfiltered (", ", gdb_stdlog);
-  target_debug_print_signals (arg1);
   fputs_unfiltered (")\n", gdb_stdlog);
 }
 

gdb/target.c

@@ -2111,15 +2111,15 @@ make_scoped_defer_target_commit_resume ()
 }
 
 void
-target_pass_signals (int numsigs, const unsigned char *pass_signals)
+target_pass_signals (gdb::array_view<const unsigned char> pass_signals)
 {
-  current_top_target ()->pass_signals (numsigs, pass_signals);
+  current_top_target ()->pass_signals (pass_signals);
 }
 
 void
-target_program_signals (int numsigs, const unsigned char *program_signals)
+target_program_signals (gdb::array_view<const unsigned char> program_signals)
 {
-  current_top_target ()->program_signals (numsigs, program_signals);
+  current_top_target ()->program_signals (program_signals);
 }
 
 static int

gdb/target.h

@@ -637,14 +637,12 @@ struct target_ops
 
     /* Documentation of this routine is provided with the corresponding
        target_* macro.  */
-    virtual void pass_signals (int,
+    virtual void pass_signals (gdb::array_view<const unsigned char> TARGET_DEBUG_PRINTER (target_debug_print_signals))
-			       const unsigned char * TARGET_DEBUG_PRINTER (target_debug_print_signals))
       TARGET_DEFAULT_IGNORE ();
 
     /* Documentation of this routine is provided with the
        corresponding target_* function.  */
-    virtual void program_signals (int,
+    virtual void program_signals (gdb::array_view<const unsigned char> TARGET_DEBUG_PRINTER (target_debug_print_signals))
-				  const unsigned char * TARGET_DEBUG_PRINTER (target_debug_print_signals))
       TARGET_DEFAULT_IGNORE ();
 
     virtual bool thread_alive (ptid_t ptid)
@@ -1682,7 +1680,7 @@ extern int target_can_run ();
 
 /* Set list of signals to be handled in the target.
 
-   PASS_SIGNALS is an array of size NSIG, indexed by target signal number
+   PASS_SIGNALS is an array indexed by target signal number
    (enum gdb_signal).  For every signal whose entry in this array is
    non-zero, the target is allowed -but not required- to skip reporting
    arrival of the signal to the GDB core by returning from target_wait,
@@ -1692,12 +1690,13 @@ extern int target_can_run ();
    about to receive a signal, it needs to be reported in any case, even
    if mentioned in a previous target_pass_signals call.   */
 
-extern void target_pass_signals (int nsig, const unsigned char *pass_signals);
+extern void target_pass_signals
+  (gdb::array_view<const unsigned char> pass_signals);
 
 /* Set list of signals the target may pass to the inferior.  This
    directly maps to the "handle SIGNAL pass/nopass" setting.
 
-   PROGRAM_SIGNALS is an array of size NSIG, indexed by target signal
+   PROGRAM_SIGNALS is an array indexed by target signal
    number (enum gdb_signal).  For every signal whose entry in this
    array is non-zero, the target is allowed to pass the signal to the
    inferior.  Signals not present in the array shall be silently
@@ -1708,8 +1707,8 @@ extern void target_pass_signals (int nsig, const unsigned char *pass_signals);
    example, when detaching (as threads may have been suspended with
    pending signals not reported to GDB).  */
 
-extern void target_program_signals (int nsig,
+extern void target_program_signals
-				    const unsigned char *program_signals);
+  (gdb::array_view<const unsigned char> program_signals);
 
 /* Check to see if a thread is still alive.  */