[binutils-gdb] gdb/dwarf: remove line_header::total_length field

[Simon Marchi <simark@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ebf58f8eb185e49fa4ed05b5e2ff5d703229b9b7

commit ebf58f8eb185e49fa4ed05b5e2ff5d703229b9b7
Author: Simon Marchi <simon.marchi@efficios.com>
Date:   Tue Apr 12 15:31:24 2022 -0400

    gdb/dwarf: remove line_header::total_length field
    
    This doesn' have to be a field, it can simply be a local variable in
    dwarf_decode_line_header.  Name the local variable "unit_length", since
    that's what the field in called in DWARF 4 and 5.  It's always easier to
    follow the code with the standard on the side when we use the same
    terminology.
    
    Change-Id: I3ad1022afd9410b193ea11b9b5437686c1e4e633

Diff:
---
 gdb/dwarf2/line-header.c | 10 +++++-----
 gdb/dwarf2/line-header.h |  1 -
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/gdb/dwarf2/line-header.c b/gdb/dwarf2/line-header.c
index 8f4eb4f124c..9a5f3fabe8d 100644
--- a/gdb/dwarf2/line-header.c
+++ b/gdb/dwarf2/line-header.c
@@ -289,19 +289,19 @@ dwarf_decode_line_header  (sect_offset sect_off, bool is_dwz,
   line_ptr = section->buffer + to_underlying (sect_off);
 
   /* Read in the header.  */
-  lh->total_length =
-    read_checked_initial_length_and_offset (abfd, line_ptr, cu_header,
-					    &bytes_read, &offset_size);
+  LONGEST unit_length
+    = read_checked_initial_length_and_offset (abfd, line_ptr, cu_header,
+					      &bytes_read, &offset_size);
   line_ptr += bytes_read;
 
   const gdb_byte *start_here = line_ptr;
 
-  if (line_ptr + lh->total_length > (section->buffer + section->size))
+  if (line_ptr + unit_length > (section->buffer + section->size))
     {
       dwarf2_statement_list_fits_in_line_number_section_complaint ();
       return 0;
     }
-  lh->statement_program_end = start_here + lh->total_length;
+  lh->statement_program_end = start_here + unit_length;
   lh->version = read_2_bytes (abfd, line_ptr);
   line_ptr += 2;
   if (lh->version > 5)
diff --git a/gdb/dwarf2/line-header.h b/gdb/dwarf2/line-header.h
index 4adfe91b8ac..25b9e7c2032 100644
--- a/gdb/dwarf2/line-header.h
+++ b/gdb/dwarf2/line-header.h
@@ -136,7 +136,6 @@ struct line_header
   /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile.  */
   unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class.  */
 
-  unsigned int total_length {};
   unsigned short version {};
   unsigned int header_length {};
   unsigned char minimum_instruction_length {};