gdb: add program_space parameter to target_so_ops::clear_solib

The clear_solib is implicitly meant to clear the resources associated to
the current program space (that's what the solib implementations that
actually support multi-program-space / multi-inferior do).  Make that
explicit by adding a program_space parameter and pass down
current_program_space in call sites.  The implementation of the
clear_solib callbacks is fairly simple, I don't think any of them rely
on global state other than accessing current_program_space.

Change-Id: I8d0cc4db7b4f8db8d7452879c0c62db03269bf46
Approved-By: Pedro Alves <pedro@palves.net>
Reviewed-By: Reviewed-By: Lancelot Six <lancelot.six@amd.com>

6 files changed, 33 insertions, 42 deletions

diff --git a/gdb/solib-darwin.c b/gdb/solib-darwin.c
index 98c81bb..fe6483e 100644
--- a/gdb/solib-darwin.c
+++ b/gdb/solib-darwin.c
@@ -75,19 +75,17 @@ struct darwin_info
 static const registry<program_space>::key<darwin_info>
   solib_darwin_pspace_data;
 
-/* Get the current darwin data.  If none is found yet, add it now.  This
+/* Get the darwin solib data for PSPACE.  If none is found yet, add it now.  This
    function always returns a valid object.  */
 
-static struct darwin_info *
-get_darwin_info (void)
+static darwin_info *
+get_darwin_info (program_space *pspace)
 {
-  struct darwin_info *info;
-
-  info = solib_darwin_pspace_data.get (current_program_space);
-  if (info != NULL)
+  darwin_info *info = solib_darwin_pspace_data.get (pspace);
+  if (info != nullptr)
     return info;
 
-  return solib_darwin_pspace_data.emplace (current_program_space);
+  return solib_darwin_pspace_data.emplace (pspace);
 }
 
 /* Return non-zero if the version in dyld_all_image is known.  */
@@ -225,7 +223,7 @@ darwin_current_sos (void)
   struct so_list *head = NULL;
   struct so_list *tail = NULL;
   int i;
-  struct darwin_info *info = get_darwin_info ();
+  darwin_info *info = get_darwin_info (current_program_space);
 
   /* Be sure image infos are loaded.  */
   darwin_load_image_infos (info);
@@ -506,7 +504,7 @@ darwin_solib_create_inferior_hook (int from_tty)
   if (!target_has_execution ())
     return;
 
-  struct darwin_info *info = get_darwin_info ();
+  darwin_info *info = get_darwin_info (current_program_space);
   CORE_ADDR load_addr;
 
   info->all_image_addr = 0;
@@ -601,9 +599,9 @@ darwin_solib_create_inferior_hook (int from_tty)
 }
 
 static void
-darwin_clear_solib (void)
+darwin_clear_solib (program_space *pspace)
 {
-  struct darwin_info *info = get_darwin_info ();
+  darwin_info *info = get_darwin_info (pspace);
 
   info->all_image_addr = 0;
   info->all_image.version = 0;
diff --git a/gdb/solib-dsbt.c b/gdb/solib-dsbt.c
index c29b2b8..1ec4afa 100644
--- a/gdb/solib-dsbt.c
+++ b/gdb/solib-dsbt.c
@@ -166,19 +166,17 @@ struct dsbt_info
 /* Per-program-space data key.  */
 static const registry<program_space>::key<dsbt_info> solib_dsbt_pspace_data;
 
-/* Get the current dsbt data.  If none is found yet, add it now.  This
+/* Get the dsbt solib data for PSPACE.  If none is found yet, add it now.  This
    function always returns a valid object.  */
 
-static struct dsbt_info *
-get_dsbt_info (void)
+static dsbt_info *
+get_dsbt_info (program_space *pspace)
 {
-  struct dsbt_info *info;
-
-  info = solib_dsbt_pspace_data.get (current_program_space);
-  if (info != NULL)
+  dsbt_info *info = solib_dsbt_pspace_data.get (pspace);
+  if (info != nullptr)
     return info;
 
-  return solib_dsbt_pspace_data.emplace (current_program_space);
+  return solib_dsbt_pspace_data.emplace (pspace);
 }
 
 
@@ -270,9 +268,6 @@ decode_loadmap (const gdb_byte *buf)
   return int_ldmbuf;
 }
 
-
-static struct dsbt_info *get_dsbt_info (void);
-
 /* Interrogate the Linux kernel to find out where the program was loaded.
    There are two load maps; one for the executable and one for the
    interpreter (only in the case of a dynamically linked executable).  */
@@ -280,7 +275,7 @@ static struct dsbt_info *get_dsbt_info (void);
 static void
 dsbt_get_initial_loadmaps (void)
 {
-  struct dsbt_info *info = get_dsbt_info ();
+  dsbt_info *info = get_dsbt_info (current_program_space);
   gdb::optional<gdb::byte_vector> buf
     = target_read_alloc (current_inferior ()->top_target (),
 			 TARGET_OBJECT_FDPIC, "exec");
@@ -442,7 +437,7 @@ lm_base (void)
   struct bound_minimal_symbol got_sym;
   CORE_ADDR addr;
   gdb_byte buf[TIC6X_PTR_SIZE];
-  struct dsbt_info *info = get_dsbt_info ();
+  dsbt_info *info = get_dsbt_info (current_program_space);
 
   /* One of our assumptions is that the main executable has been relocated.
      Bail out if this has not happened.  (Note that post_create_inferior
@@ -524,7 +519,7 @@ dsbt_current_sos (void)
   CORE_ADDR lm_addr;
   struct so_list *sos_head = NULL;
   struct so_list **sos_next_ptr = &sos_head;
-  struct dsbt_info *info = get_dsbt_info ();
+  dsbt_info *info = get_dsbt_info (current_program_space);
 
   /* Make sure that the main executable has been relocated.  This is
      required in order to find the address of the global offset table,
@@ -645,7 +640,7 @@ dsbt_current_sos (void)
 static int
 dsbt_in_dynsym_resolve_code (CORE_ADDR pc)
 {
-  struct dsbt_info *info = get_dsbt_info ();
+  dsbt_info *info = get_dsbt_info (current_program_space);
 
   return ((pc >= info->interp_text_sect_low && pc < info->interp_text_sect_high)
 	  || (pc >= info->interp_plt_sect_low && pc < info->interp_plt_sect_high)
@@ -675,7 +670,6 @@ static int
 enable_break (void)
 {
   asection *interp_sect;
-  struct dsbt_info *info;
 
   if (current_program_space->exec_bfd () == NULL)
     return 0;
@@ -683,7 +677,7 @@ enable_break (void)
   if (!target_has_execution ())
     return 0;
 
-  info = get_dsbt_info ();
+  dsbt_info *info = get_dsbt_info (current_program_space);
 
   info->interp_text_sect_low = 0;
   info->interp_text_sect_high = 0;
@@ -803,7 +797,7 @@ dsbt_relocate_main_executable (void)
 {
   struct int_elf32_dsbt_loadmap *ldm;
   int changed;
-  struct dsbt_info *info = get_dsbt_info ();
+  dsbt_info *info = get_dsbt_info (current_program_space);
 
   dsbt_get_initial_loadmaps ();
   ldm = info->exec_loadmap;
@@ -875,9 +869,9 @@ dsbt_solib_create_inferior_hook (int from_tty)
 }
 
 static void
-dsbt_clear_solib (void)
+dsbt_clear_solib (program_space *pspace)
 {
-  struct dsbt_info *info = get_dsbt_info ();
+  dsbt_info *info = get_dsbt_info (pspace);
 
   info->lm_base_cache = 0;
   info->main_lm_addr = 0;
diff --git a/gdb/solib-frv.c b/gdb/solib-frv.c
index d4e84a1..c61ed79 100644
--- a/gdb/solib-frv.c
+++ b/gdb/solib-frv.c
@@ -806,7 +806,7 @@ frv_solib_create_inferior_hook (int from_tty)
 }
 
 static void
-frv_clear_solib (void)
+frv_clear_solib (program_space *pspace)
 {
   lm_base_cache = 0;
   enable_break2_done = 0;
diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c
index 7bc6ca4..1f8b8b3 100644
--- a/gdb/solib-svr4.c
+++ b/gdb/solib-svr4.c
@@ -3178,11 +3178,9 @@ svr4_solib_create_inferior_hook (int from_tty)
 }
 
 static void
-svr4_clear_solib (void)
+svr4_clear_solib (program_space *pspace)
 {
-  struct svr4_info *info;
-
-  info = get_svr4_info (current_program_space);
+  svr4_info *info = get_svr4_info (pspace);
   info->debug_base = 0;
   info->debug_loader_offset_p = 0;
   info->debug_loader_offset = 0;
diff --git a/gdb/solib.c b/gdb/solib.c
index e821181..54a4c39 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -1241,7 +1241,7 @@ clear_solib (void)
     }
 
   if (ops->clear_solib != nullptr)
-    ops->clear_solib ();
+    ops->clear_solib (current_program_space);
 }
 
 /* Shared library startup support.  When GDB starts up the inferior,
@@ -1411,7 +1411,7 @@ reload_shared_libraries (const char *ignored, int from_tty,
       /* Reset or free private data structures not associated with
 	 so_list entries.  */
       if (ops->clear_solib != nullptr)
-	ops->clear_solib ();
+	ops->clear_solib (current_program_space);
 
       /* Remove any previous solib event breakpoint.  This is usually
 	 done in common code, at breakpoint_init_inferior time, but
diff --git a/gdb/solist.h b/gdb/solist.h
index 0f764b2..b3a06b8 100644
--- a/gdb/solist.h
+++ b/gdb/solist.h
@@ -96,9 +96,10 @@ struct target_so_ops
      It is also called before free_so when SO is about to be freed.  */
   void (*clear_so) (struct so_list *so);
 
-  /* Reset or free private data structures not associated with
-     so_list entries.  */
-  void (*clear_solib) (void);
+  /* Free private data structures associated to PSPACE.  This method
+     should not free resources associated to individual so_list entries,
+     those are cleared by the clear_so method.  */
+  void (*clear_solib) (program_space *pspace);
 
   /* Target dependent code to run after child process fork.  */
   void (*solib_create_inferior_hook) (int from_tty);