Allocate the address map on the psymtab obstack

After this patch, the psymtab address map will now be allocated on the
psymtab obstack rather than the objfile obstack.  This also changes
the psymtab storage object to make the obstack private; this will be
used later.

gdb/ChangeLog
2019-01-10  Tom Tromey  <tom@tromey.com>

	* psymtab.h (psymtab_storage::obstack): New method.
	<m_obstack>: Rename from obstack; now private.
	* psymtab.c (psymtab_storage): Update.
	* dwarf2read.c (create_addrmap_from_index)
	(create_addrmap_from_aranges, dwarf2_build_psymtabs_hard):
	Update.

4 files changed, 27 insertions, 9 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 211867d..81f07f7 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,14 @@
 2019-01-10  Tom Tromey  <tom@tromey.com>
 
+	* psymtab.h (psymtab_storage::obstack): New method.
+	<m_obstack>: Rename from obstack; now private.
+	* psymtab.c (psymtab_storage): Update.
+	* dwarf2read.c (create_addrmap_from_index)
+	(create_addrmap_from_aranges, dwarf2_build_psymtabs_hard):
+	Update.
+
+2019-01-10  Tom Tromey  <tom@tromey.com>
+
 	* symfile.c (reread_symbols): Call objfile->reset_psymtabs.
 	* objfiles.h (objfile::reset_psymtabs): New method.
 
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index a0365f5..97ca341 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -3191,7 +3191,7 @@ create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
     }
 
   objfile->partial_symtabs->psymtabs_addrmap
-    = addrmap_create_fixed (mutable_map, &objfile->objfile_obstack);
+    = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ());
 }
 
 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
@@ -3352,7 +3352,7 @@ create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
     }
 
   objfile->partial_symtabs->psymtabs_addrmap
-    = addrmap_create_fixed (mutable_map, &objfile->objfile_obstack);
+    = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ());
 }
 
 /* Find a slot in the mapped index INDEX for the object named NAME.
@@ -8491,7 +8491,7 @@ dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
 
   objfile->partial_symtabs->psymtabs_addrmap
     = addrmap_create_fixed (objfile->partial_symtabs->psymtabs_addrmap,
-			    &objfile->objfile_obstack);
+			    objfile->partial_symtabs->obstack ());
   /* At this point we want to keep the address map.  */
   save_psymtabs_addrmap.release ();
 
diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 7af82d6..e185441 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -68,8 +68,8 @@ static struct compunit_symtab *psymtab_to_symtab (struct objfile *objfile,
 
 
 psymtab_storage::psymtab_storage (struct objfile *objfile)
-  : obstack (&objfile->objfile_obstack),
-    psymbol_cache (psymbol_bcache_init ())
+  : psymbol_cache (psymbol_bcache_init ()),
+    m_obstack (&objfile->objfile_obstack)
 {
 }
 
diff --git a/gdb/psymtab.h b/gdb/psymtab.h
index 895f950..d0e5969 100644
--- a/gdb/psymtab.h
+++ b/gdb/psymtab.h
@@ -55,6 +55,13 @@ public:
 
   void discard_psymtab (struct partial_symtab *pst);
 
+  /* Return the obstack that is used for storage by this object.  */
+
+  struct obstack *obstack ()
+  {
+    return m_obstack;
+  }
+
 
   /* Each objfile points to a linked list of partial symtabs derived from
      this file, one partial symtab structure for each compilation unit
@@ -73,10 +80,6 @@ public:
 
   struct partial_symtab *free_psymtabs = nullptr;
 
-  /* The obstack where allocations are made.  */
-
-  struct obstack *obstack;
-
   /* A byte cache where we can stash arbitrary "chunks" of bytes that
      will not change.  */
 
@@ -87,6 +90,12 @@ public:
 
   std::vector<partial_symbol *> global_psymbols;
   std::vector<partial_symbol *> static_psymbols;
+
+private:
+
+  /* The obstack where allocations are made.  */
+
+  struct obstack *m_obstack;
 };