Move dwarf2_per_cu_data::imported_symtabs earlier

This moves dwarf2_per_cu_data::imported_symtabs earlier, near where
the other data members are located.

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

	* dwarf2/read.h (struct dwarf2_per_cu_data) <imported_symtabs>:
	Move earlier.

Change-Id: I314ddaa6f67c53a848e513b3f6d42913bd957833

2 files changed, 31 insertions, 26 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 81e9746..17d7c95 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2020-02-08  Tom Tromey  <tom@tromey.com>
 
+	* dwarf2/read.h (struct dwarf2_per_cu_data) <imported_symtabs>:
+	Move earlier.
+
+2020-02-08  Tom Tromey  <tom@tromey.com>
+
 	* dwarf2/read.h (dwarf_line_debug): Declare.
 	* Makefile.in (COMMON_SFILES): Add dwarf2/line-header.c.
 	* dwarf2/read.c: Move line_header code to new files.
diff --git a/gdb/dwarf2/read.h b/gdb/dwarf2/read.h
index 2dc657f..f76937c 100644
--- a/gdb/dwarf2/read.h
+++ b/gdb/dwarf2/read.h
@@ -338,6 +338,32 @@ struct dwarf2_per_cu_data
     struct dwarf2_per_cu_quick_data *quick;
   } v;
 
+  /* The CUs we import using DW_TAG_imported_unit.  This is filled in
+     while reading psymtabs, used to compute the psymtab dependencies,
+     and then cleared.  Then it is filled in again while reading full
+     symbols, and only deleted when the objfile is destroyed.
+
+     This is also used to work around a difference between the way gold
+     generates .gdb_index version <=7 and the way gdb does.  Arguably this
+     is a gold bug.  For symbols coming from TUs, gold records in the index
+     the CU that includes the TU instead of the TU itself.  This breaks
+     dw2_lookup_symbol: It assumes that if the index says symbol X lives
+     in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
+     will find X.  Alas TUs live in their own symtab, so after expanding CU Y
+     we need to look in TU Z to find X.  Fortunately, this is akin to
+     DW_TAG_imported_unit, so we just use the same mechanism: For
+     .gdb_index version <=7 this also records the TUs that the CU referred
+     to.  Concurrently with this change gdb was modified to emit version 8
+     indices so we only pay a price for gold generated indices.
+     http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
+
+     This currently needs to be a public member due to how
+     dwarf2_per_cu_data is allocated and used.  Ideally in future things
+     could be refactored to make this private.  Until then please try to
+     avoid direct access to this member, and instead use the helper
+     functions above.  */
+  std::vector <dwarf2_per_cu_data *> *imported_symtabs;
+
   /* Return true of IMPORTED_SYMTABS is empty or not yet allocated.  */
   bool imported_symtabs_empty () const
   {
@@ -368,32 +394,6 @@ struct dwarf2_per_cu_data
     delete imported_symtabs;
     imported_symtabs = nullptr;
   }
-
-  /* The CUs we import using DW_TAG_imported_unit.  This is filled in
-     while reading psymtabs, used to compute the psymtab dependencies,
-     and then cleared.  Then it is filled in again while reading full
-     symbols, and only deleted when the objfile is destroyed.
-
-     This is also used to work around a difference between the way gold
-     generates .gdb_index version <=7 and the way gdb does.  Arguably this
-     is a gold bug.  For symbols coming from TUs, gold records in the index
-     the CU that includes the TU instead of the TU itself.  This breaks
-     dw2_lookup_symbol: It assumes that if the index says symbol X lives
-     in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
-     will find X.  Alas TUs live in their own symtab, so after expanding CU Y
-     we need to look in TU Z to find X.  Fortunately, this is akin to
-     DW_TAG_imported_unit, so we just use the same mechanism: For
-     .gdb_index version <=7 this also records the TUs that the CU referred
-     to.  Concurrently with this change gdb was modified to emit version 8
-     indices so we only pay a price for gold generated indices.
-     http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
-
-     This currently needs to be a public member due to how
-     dwarf2_per_cu_data is allocated and used.  Ideally in future things
-     could be refactored to make this private.  Until then please try to
-     avoid direct access to this member, and instead use the helper
-     functions above.  */
-  std::vector <dwarf2_per_cu_data *> *imported_symtabs;
 };
 
 /* Entry in the signatured_types hash table.  */