[SCM] archer-tromey-dwz-multifile: the dwz file can contain a .debug_line section

[tromey@sourceware.org]

The branch, archer-tromey-dwz-multifile has been updated
       via  5f4e62198dddaf44696edca7542fc0b5fbee1bd5 (commit)
       via  ce4c7d1657125be1709710315fe03250b2c9878d (commit)
      from  c11f6dbe8028d3ca7b263d54f20164fc2f222d28 (commit)

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- Log -----------------------------------------------------------------
commit 5f4e62198dddaf44696edca7542fc0b5fbee1bd5
Author: Tom Tromey <tromey@redhat.com>
Date:   Thu Jun 7 08:05:23 2012 -0600

    the dwz file can contain a .debug_line section
    
    fix gdb to read this properly
    fixes a minor latent bug here introduced by fission

commit ce4c7d1657125be1709710315fe03250b2c9878d
Author: Tom Tromey <tromey@redhat.com>
Date:   Thu Jun 7 07:46:55 2012 -0600

    fix to always use proper abbrev section

-----------------------------------------------------------------------

Summary of changes:
 gdb/dwarf2read.c |   50 ++++++++++++++++++++++++++++++++++++++++----------
 1 files changed, 40 insertions(+), 10 deletions(-)

First 500 lines of diff:
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 30123d3..6a2556a 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -583,6 +583,7 @@ struct dwz_file
   struct dwarf2_section_info abbrev;
   struct dwarf2_section_info info;
   struct dwarf2_section_info str;
+  struct dwarf2_section_info line;
   struct dwarf2_section_info macro;
   struct dwarf2_section_info gdb_index;
 
@@ -1779,6 +1780,11 @@ locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
       dwz_file->str.asection = sectp;
       dwz_file->str.size = bfd_get_section_size (sectp);
     }
+  else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
+    {
+      dwz_file->line.asection = sectp;
+      dwz_file->line.size = bfd_get_section_size (sectp);
+    }
   else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
     {
       dwz_file->macro.asection = sectp;
@@ -3571,6 +3577,7 @@ create_debug_types_hash_table (struct dwo_file *dwo_file,
     {
       bfd *abfd;
       gdb_byte *info_ptr, *end_ptr;
+      struct dwarf2_section_info *abbrev_section;
 
       dwarf2_read_section (objfile, section);
       info_ptr = section->buffer;
@@ -3582,6 +3589,11 @@ create_debug_types_hash_table (struct dwo_file *dwo_file,
 	 not present, in which case section->asection will be NULL.  */
       abfd = section->asection->owner;
 
+      if (dwo_file)
+	abbrev_section = &dwo_file->sections.abbrev;
+      else
+	abbrev_section = &dwarf2_per_objfile->abbrev;
+
       if (types_htab == NULL)
 	{
 	  if (dwo_file)
@@ -3617,7 +3629,7 @@ create_debug_types_hash_table (struct dwo_file *dwo_file,
 	     table, but we don't need anything else just yet.  */
 
 	  ptr = read_and_check_type_unit_head (&header, section,
-					       &dwo_file->sections.abbrev, ptr,
+					       abbrev_section, ptr,
 					       &signature, &type_offset_in_tu);
 
 	  length = header.initial_length_size + header.length;
@@ -4181,7 +4193,7 @@ init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
 				void *data)
 {
   init_cutu_and_read_dies_no_follow (this_cu,
-				     &dwarf2_per_objfile->abbrev,
+				     get_abbrev_section_for_cu (this_cu),
 				     NULL,
 				     die_reader_func, data);
 }
@@ -12718,6 +12730,30 @@ add_file_name (struct line_header *lh,
   fe->symtab = NULL;
 }
 
+/* A convenience function to find the proper .debug_line section for a
+   CU.  */
+
+static struct dwarf2_section_info *
+get_debug_line_section (struct dwarf2_cu *cu)
+{
+  struct dwarf2_section_info *section;
+
+  /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
+     DWO file.  */
+  if (cu->dwo_unit && cu->per_cu->is_debug_types)
+    section = &cu->dwo_unit->dwo_file->sections.line;
+  else if (cu->per_cu->is_dwz)
+    {
+      struct dwz_file *dwz = dwarf2_get_dwz_file ();
+
+      section = &dwz->line;
+    }
+  else
+    section = &dwarf2_per_objfile->line;
+
+  return section;
+}
+
 /* Read the statement program header starting at OFFSET in
    .debug_line, or .debug_line.dwo.  Return a pointer
    to a struct line_header, allocated using xmalloc.
@@ -12738,13 +12774,7 @@ dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu)
   struct dwarf2_section_info *section;
   bfd *abfd;
 
-  /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
-     DWO file.  */
-  if (cu->dwo_unit && cu->per_cu->is_debug_types)
-    section = &cu->dwo_unit->dwo_file->sections.line;
-  else
-    section = &dwarf2_per_objfile->line;
-
+  section = get_debug_line_section (cu);
   dwarf2_read_section (dwarf2_per_objfile->objfile, section);
   if (section->buffer == NULL)
     {
@@ -13069,7 +13099,7 @@ dwarf_decode_lines_1 (struct line_header *lh, const char *comp_dir,
 			 GCd by the linker.  Ignore it.  PR gdb/12528 */
 
 		      long line_offset
-			= line_ptr - dwarf2_per_objfile->line.buffer;
+			= line_ptr - get_debug_line_section (cu)->buffer;
 
 		      complaint (&symfile_complaints,
 				 _(".debug_line address at offset 0x%lx is 0 "


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