From 0e8621a0bec2d0840b853c4104614f345f0569ca Mon Sep 17 00:00:00 2001
From: Tom Tromey <tom@tromey.com>
Date: Thu, 6 Apr 2017 20:09:42 -0600
Subject: Introduce gdb_dlhandle_up

This introduces gdb_dlhandle_up, a unique_ptr that can close a
dlopen'd library.  All the functions working with dlopen handles are
updated to use this new type.

I did not try to build this on Windows.

gdb/ChangeLog
2017-04-12  Tom Tromey  <tom@tromey.com>

	* jit.c (struct jit_reader): Declare separately.  Add constructor
	and destructor.  Change type of "handle".
	(loaded_jit_reader): Define separately.
	(jit_reader_load): Update.  New "new".
	(jit_reader_unload_command): Use "delete".
	* gdb-dlfcn.h (struct dlclose_deleter): New.
	(gdb_dlhandle_up): New typedef.
	(gdb_dlopen, gdb_dlsym): Update types.
	(gdb_dlclose): Remove.
	* gdb-dlfcn.c (gdb_dlopen): Return a gdb_dlhandle_up.
	(gdb_dlsym): Change type of "handle".
	(make_cleanup_dlclose): Remove.
	(dlclose_deleter::operator()): Rename from gdb_dlclose.
	* compile/compile-c-support.c (load_libcc): Update.
---
 gdb/jit.c | 42 +++++++++++++++++++++++-------------------
 1 file changed, 23 insertions(+), 19 deletions(-)

(limited to 'gdb/jit.c')

diff --git a/gdb/jit.c b/gdb/jit.c
index 158d6d8..ddf1005 100644
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -151,14 +151,29 @@ bfd_open_from_target_memory (CORE_ADDR addr, ULONGEST size, char *target)
 			      mem_bfd_iovec_stat);
 }
 
+struct jit_reader
+{
+  jit_reader (struct gdb_reader_funcs *f, gdb_dlhandle_up &&h)
+    : functions (f), handle (std::move (h))
+  {
+  }
+
+  ~jit_reader ()
+  {
+    functions->destroy (functions);
+  }
+
+  jit_reader (const jit_reader &) = delete;
+  jit_reader &operator= (const jit_reader &) = delete;
+
+  struct gdb_reader_funcs *functions;
+  gdb_dlhandle_up handle;
+};
+
 /* One reader that has been loaded successfully, and can potentially be used to
    parse debug info.  */
 
-static struct jit_reader
-{
-  struct gdb_reader_funcs *functions;
-  void *handle;
-} *loaded_jit_reader = NULL;
+static struct jit_reader *loaded_jit_reader = NULL;
 
 typedef struct gdb_reader_funcs * (reader_init_fn_type) (void);
 static const char *reader_init_fn_sym = "gdb_init_reader";
@@ -168,17 +183,13 @@ static const char *reader_init_fn_sym = "gdb_init_reader";
 static struct jit_reader *
 jit_reader_load (const char *file_name)
 {
-  void *so;
   reader_init_fn_type *init_fn;
-  struct jit_reader *new_reader = NULL;
   struct gdb_reader_funcs *funcs = NULL;
-  struct cleanup *old_cleanups;
 
   if (jit_debug)
     fprintf_unfiltered (gdb_stdlog, _("Opening shared object %s.\n"),
                         file_name);
-  so = gdb_dlopen (file_name);
-  old_cleanups = make_cleanup_dlclose (so);
+  gdb_dlhandle_up so = gdb_dlopen (file_name);
 
   init_fn = (reader_init_fn_type *) gdb_dlsym (so, reader_init_fn_sym);
   if (!init_fn)
@@ -192,12 +203,7 @@ jit_reader_load (const char *file_name)
   if (funcs->reader_version != GDB_READER_INTERFACE_VERSION)
     error (_("Reader version does not match GDB version."));
 
-  new_reader = XCNEW (struct jit_reader);
-  new_reader->functions = funcs;
-  new_reader->handle = so;
-
-  discard_cleanups (old_cleanups);
-  return new_reader;
+  return new jit_reader (funcs, std::move (so));
 }
 
 /* Provides the jit-reader-load command.  */
@@ -240,10 +246,8 @@ jit_reader_unload_command (char *args, int from_tty)
 
   reinit_frame_cache ();
   jit_inferior_exit_hook (current_inferior ());
-  loaded_jit_reader->functions->destroy (loaded_jit_reader->functions);
 
-  gdb_dlclose (loaded_jit_reader->handle);
-  xfree (loaded_jit_reader);
+  delete loaded_jit_reader;
   loaded_jit_reader = NULL;
 }
 
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