Change dwarf2_per_objfile::type_unit_groups to htab_up

This changes dwarf2_per_objfile::type_unit_groups to be an htab_up,
again allowing us to move the memory used by the hash table from the
objfile obstack to the heap.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (allocate_type_unit_groups_table): Return
	htab_up.  Don't allocate on obstack.
	(get_type_unit_group, dwarf2_build_psymtabs_hard): Update.
	* dwarf2/read.h (struct dwarf2_per_objfile) <type_unit_groups>:
	Change type to htab_up.

Change-Id: Ia045df0ff3ec30aac813da5a9a2314a607ef7ec8

gdb/ChangeLog

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 50aecc7..7e603f0 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,13 @@
 2020-02-08  Tom Tromey  <tom@tromey.com>
 
+	* dwarf2/read.c (allocate_type_unit_groups_table): Return
+	htab_up.  Don't allocate on obstack.
+	(get_type_unit_group, dwarf2_build_psymtabs_hard): Update.
+	* dwarf2/read.h (struct dwarf2_per_objfile) <type_unit_groups>:
+	Change type to htab_up.
+
+2020-02-08  Tom Tromey  <tom@tromey.com>
+
 	* dwarf2/read.h (struct dwarf2_per_objfile) <signatured_types>:
 	Change type to htab_up.
 	* dwarf2/read.c (create_signatured_type_table_from_index)

gdb/dwarf2/read.c

diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index d47a90b..f6501c6 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -7520,16 +7520,13 @@
 
 /* Allocate a hash table for type unit groups.  */
 
-static htab_t
+static htab_up
 allocate_type_unit_groups_table (struct objfile *objfile)
 {
-  return htab_create_alloc_ex (3,
-			       hash_type_unit_group,
-			       eq_type_unit_group,
-			       NULL,
-			       &objfile->objfile_obstack,
-			       hashtab_obstack_allocate,
-			       dummy_obstack_deallocate);
+  return htab_up (htab_create_alloc (3,
+				     hash_type_unit_group,
+				     eq_type_unit_group,
+				     NULL, xcalloc, xfree));
 }
 
 /* Type units that don't have DW_AT_stmt_list are grouped into their own
@@ -7625,7 +7622,7 @@
 
   type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
   type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
-  slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
+  slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups.get (),
 			 &type_unit_group_for_lookup, INSERT);
   if (*slot != NULL)
     {
@@ -8193,7 +8190,7 @@
   /* Now that all TUs have been processed we can fill in the dependencies.  */
   if (dwarf2_per_objfile->type_unit_groups != NULL)
     {
-      htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
+      htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups.get (),
 			      build_type_psymtab_dependencies, dwarf2_per_objfile);
     }
 

gdb/dwarf2/read.h

diff --git a/gdb/dwarf2/read.h b/gdb/dwarf2/read.h
index ac87258..9e08cc1 100644
--- a/gdb/dwarf2/read.h
+++ b/gdb/dwarf2/read.h
@@ -153,7 +153,7 @@
 
   /* Table of struct type_unit_group objects.
      The hash key is the DW_AT_stmt_list value.  */
-  htab_t type_unit_groups {};
+  htab_up type_unit_groups;
 
   /* A table mapping .debug_types signatures to its signatured_type entry.
      This is NULL if the .debug_types section hasn't been read in yet.  */