[patch] dwarf2read.c (partial_read_comp_unit_head) cleanup

[dje@google.com (Doug Evans)]

Hi.

There may have been a reason in the past to not have
partial_read_comp_unit_head set offset,first_die_offset
but I can't think of one now.

I will check this in in a few days if there are no objections.

2011-09-12  Doug Evans  <dje@google.com>

	* dwarf2read.c (partial_read_comp_unit_head): Set header->offset,
	header->first_die_offset here.  All callers updated.

Index: dwarf2read.c
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2read.c,v
retrieving revision 1.560
diff -u -p -r1.560 dwarf2read.c
--- dwarf2read.c	9 Sep 2011 19:41:13 -0000	1.560
+++ dwarf2read.c	12 Sep 2011 18:29:28 -0000
@@ -2268,7 +2268,7 @@ dw2_get_file_names (struct objfile *objf
   struct cleanup *cleanups;
   struct die_info *comp_unit_die;
   struct dwarf2_section_info* sec;
-  gdb_byte *beg_of_comp_unit, *info_ptr, *buffer;
+  gdb_byte *info_ptr, *buffer;
   int has_children, i;
   struct dwarf2_cu cu;
   unsigned int bytes_read, buffer_size;
@@ -2295,16 +2295,11 @@ dw2_get_file_names (struct objfile *objf
   buffer_size = sec->size;
   buffer = sec->buffer;
   info_ptr = buffer + this_cu->offset;
-  beg_of_comp_unit = info_ptr;
 
   info_ptr = partial_read_comp_unit_head (&cu.header, info_ptr,
 					  buffer, buffer_size,
 					  abfd);
 
-  /* Complete the cu_header.  */
-  cu.header.offset = beg_of_comp_unit - buffer;
-  cu.header.first_die_offset = info_ptr - beg_of_comp_unit;
-
   this_cu->cu = &cu;
   cu.per_cu = this_cu;
 
@@ -2940,6 +2935,8 @@ read_comp_unit_head (struct comp_unit_he
   return info_ptr;
 }
 
+/* Read in a CU header and perform some basic error checking.  */
+
 static gdb_byte *
 partial_read_comp_unit_head (struct comp_unit_head *header, gdb_byte *info_ptr,
 			     gdb_byte *buffer, unsigned int buffer_size,
@@ -2947,8 +2944,12 @@ partial_read_comp_unit_head (struct comp
 {
   gdb_byte *beg_of_comp_unit = info_ptr;
 
+  header->offset = beg_of_comp_unit - buffer;
+
   info_ptr = read_comp_unit_head (header, info_ptr, abfd);
 
+  header->first_die_offset = info_ptr - beg_of_comp_unit;
+
   if (header->version != 2 && header->version != 3 && header->version != 4)
     error (_("Dwarf Error: wrong version in compilation unit header "
 	   "(is %d, should be 2, 3, or 4) [in module %s]"), header->version,
@@ -3334,10 +3335,6 @@ process_psymtab_comp_unit (struct objfil
 					  buffer, buffer_size,
 					  abfd);
 
-  /* Complete the cu_header.  */
-  cu.header.offset = beg_of_comp_unit - buffer;
-  cu.header.first_die_offset = info_ptr - beg_of_comp_unit;
-
   cu.list_in_scope = &file_symbols;
 
   /* If this compilation unit was already read in, free the
@@ -3598,7 +3595,7 @@ load_partial_comp_unit (struct dwarf2_pe
 			struct objfile *objfile)
 {
   bfd *abfd = objfile->obfd;
-  gdb_byte *info_ptr, *beg_of_comp_unit;
+  gdb_byte *info_ptr;
   struct die_info *comp_unit_die;
   struct dwarf2_cu *cu;
   struct cleanup *free_abbrevs_cleanup, *free_cu_cleanup = NULL;
@@ -3610,7 +3607,6 @@ load_partial_comp_unit (struct dwarf2_pe
 
   gdb_assert (dwarf2_per_objfile->info.readin);
   info_ptr = dwarf2_per_objfile->info.buffer + this_cu->offset;
-  beg_of_comp_unit = info_ptr;
 
   if (this_cu->cu == NULL)
     {
@@ -3627,10 +3623,6 @@ load_partial_comp_unit (struct dwarf2_pe
 					      dwarf2_per_objfile->info.size,
 					      abfd);
 
-      /* Complete the cu_header.  */
-      cu->header.offset = this_cu->offset;
-      cu->header.first_die_offset = info_ptr - beg_of_comp_unit;
-
       /* Link this compilation unit into the compilation unit tree.  */
       this_cu->cu = cu;
       cu->per_cu = this_cu;