Make process_info::syscalls_to_catch an std::vector

This patch makes the syscalls_to_catch field of process_info an
std::vector<int>.  The process_info structure must now be
newed/deleted.

In handle_extended_wait, the code that handles exec events destroys the
existing process_info and creates a new one.  It moves the content of
syscalls_to_catch from the old to the new vector.  I used std::move for
that (through an intermediary variable), which should have the same
behavior as the old code.

gdb/gdbserver/ChangeLog:

	* inferiors.h (struct process_info): Add constructor, initialize
	fields..
	<syscalls_to_catch>: Change type to std::vector<int>.
	* inferiors.c (add_process): Allocate process_info with new.
	(remove_process): Free process_info with delete.
	* linux-low.c (handle_extended_wait): Adjust.
	(gdb_catching_syscalls_p, gdb_catch_this_syscall_p): Adjust.
	* server.c (handle_general_set): Adjust.

5 files changed, 36 insertions, 28 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index d091b43..ab59f52 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,14 @@
+2017-11-17  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* inferiors.h (struct process_info): Add constructor, initialize
+	fields..
+	<syscalls_to_catch>: Change type to std::vector<int>.
+	* inferiors.c (add_process): Allocate process_info with new.
+	(remove_process): Free process_info with delete.
+	* linux-low.c (handle_extended_wait): Adjust.
+	(gdb_catching_syscalls_p, gdb_catch_this_syscall_p): Adjust.
+	* server.c (handle_general_set): Adjust.
+
 2017-11-16  Pedro Alves  <palves@redhat.com>
 
 	* remote-utils.c (remote_close): Block SIGIO signals instead of
diff --git a/gdb/gdbserver/inferiors.c b/gdb/gdbserver/inferiors.c
index a0ece4d..f4101c7 100644
--- a/gdb/gdbserver/inferiors.c
+++ b/gdb/gdbserver/inferiors.c
@@ -194,10 +194,7 @@ clear_inferiors (void)
 struct process_info *
 add_process (int pid, int attached)
 {
-  struct process_info *process = XCNEW (struct process_info);
-
-  process->pid = pid;
-  process->attached = attached;
+  process_info *process = new process_info (pid, attached);
 
   all_processes.push_back (process);
 
@@ -215,8 +212,7 @@ remove_process (struct process_info *process)
   free_all_breakpoints (process);
   gdb_assert (find_thread_process (process) == NULL);
   all_processes.remove (process);
-  VEC_free (int, process->syscalls_to_catch);
-  free (process);
+  delete process;
 }
 
 process_info *
diff --git a/gdb/gdbserver/inferiors.h b/gdb/gdbserver/inferiors.h
index fb0e2fd..4c66a74 100644
--- a/gdb/gdbserver/inferiors.h
+++ b/gdb/gdbserver/inferiors.h
@@ -33,6 +33,10 @@ struct process_info_private;
 
 struct process_info
 {
+  process_info (int pid_, int attached_)
+  : pid (pid_), attached (attached_)
+  {}
+
   /* This process' pid.  */
   int pid;
 
@@ -42,28 +46,28 @@ struct process_info
 
   /* True if GDB asked us to detach from this process, but we remained
      attached anyway.  */
-  int gdb_detached;
+  int gdb_detached = 0;
 
   /* The symbol cache.  */
-  struct sym_cache *symbol_cache;
+  struct sym_cache *symbol_cache = NULL;
 
   /* The list of memory breakpoints.  */
-  struct breakpoint *breakpoints;
+  struct breakpoint *breakpoints = NULL;
 
   /* The list of raw memory breakpoints.  */
-  struct raw_breakpoint *raw_breakpoints;
+  struct raw_breakpoint *raw_breakpoints = NULL;
 
   /* The list of installed fast tracepoints.  */
-  struct fast_tracepoint_jump *fast_tracepoint_jumps;
+  struct fast_tracepoint_jump *fast_tracepoint_jumps = NULL;
 
   /* The list of syscalls to report, or just a single element, ANY_SYSCALL,
      for unfiltered syscall reporting.  */
-  VEC (int) *syscalls_to_catch;
+  std::vector<int> syscalls_to_catch;
 
-  const struct target_desc *tdesc;
+  const struct target_desc *tdesc = NULL;
 
   /* Private target data.  */
-  struct process_info_private *priv;
+  struct process_info_private *priv = NULL;
 };
 
 /* Get the pid of PROC.  */
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index b367e53..b267c70 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -683,7 +683,7 @@ handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat)
   else if (event == PTRACE_EVENT_EXEC && report_exec_events)
     {
       struct process_info *proc;
-      VEC (int) *syscalls_to_catch;
+      std::vector<int> syscalls_to_catch;
       ptid_t event_ptid;
       pid_t event_pid;
 
@@ -699,8 +699,7 @@ handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat)
 
       /* Save the syscall list from the execing process.  */
       proc = get_thread_process (event_thr);
-      syscalls_to_catch = proc->syscalls_to_catch;
-      proc->syscalls_to_catch = NULL;
+      syscalls_to_catch = std::move (proc->syscalls_to_catch);
 
       /* Delete the execing process and all its threads.  */
       linux_mourn (proc);
@@ -731,7 +730,7 @@ handle_extended_wait (struct lwp_info **orig_event_lwp, int wstat)
       /* Restore the list to catch.  Don't rely on the client, which is free
 	 to avoid sending a new list when the architecture doesn't change.
 	 Also, for ANY_SYSCALL, the architecture doesn't really matter.  */
-      proc->syscalls_to_catch = syscalls_to_catch;
+      proc->syscalls_to_catch = std::move (syscalls_to_catch);
 
       /* Report the event.  */
       *orig_event_lwp = event_lwp;
@@ -3182,7 +3181,7 @@ gdb_catching_syscalls_p (struct lwp_info *event_child)
   struct thread_info *thread = get_lwp_thread (event_child);
   struct process_info *proc = get_thread_process (thread);
 
-  return !VEC_empty (int, proc->syscalls_to_catch);
+  return !proc->syscalls_to_catch.empty ();
 }
 
 /* Returns 1 if GDB is interested in the event_child syscall.
@@ -3191,21 +3190,19 @@ gdb_catching_syscalls_p (struct lwp_info *event_child)
 static int
 gdb_catch_this_syscall_p (struct lwp_info *event_child)
 {
-  int i, iter;
   int sysno;
   struct thread_info *thread = get_lwp_thread (event_child);
   struct process_info *proc = get_thread_process (thread);
 
-  if (VEC_empty (int, proc->syscalls_to_catch))
+  if (proc->syscalls_to_catch.empty ())
     return 0;
 
-  if (VEC_index (int, proc->syscalls_to_catch, 0) == ANY_SYSCALL)
+  if (proc->syscalls_to_catch[0] == ANY_SYSCALL)
     return 1;
 
   get_syscall_trapinfo (event_child, &sysno);
-  for (i = 0;
-       VEC_iterate (int, proc->syscalls_to_catch, i, iter);
-       i++)
+
+  for (int iter : proc->syscalls_to_catch)
     if (iter == sysno)
       return 1;
 
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index e827b9c..f0dac95 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -623,7 +623,7 @@ handle_general_set (char *own_buf)
 	}
 
       process = current_process ();
-      VEC_truncate (int, process->syscalls_to_catch, 0);
+      process->syscalls_to_catch.clear ();
 
       if (enabled)
 	{
@@ -634,11 +634,11 @@ handle_general_set (char *own_buf)
 	      while (*p != '\0')
 		{
 		  p = decode_address_to_semicolon (&sysno, p);
-		  VEC_safe_push (int, process->syscalls_to_catch, (int) sysno);
+		  process->syscalls_to_catch.push_back (sysno);
 		}
 	    }
 	  else
-	    VEC_safe_push (int, process->syscalls_to_catch, ANY_SYSCALL);
+	    process->syscalls_to_catch.push_back (ANY_SYSCALL);
 	}
 
       write_ok (own_buf);