Add support for generating DWARF-5 format directory and file name tables from the assembler.

	PR 25611
	PR 25614
	* dwarf.h (DWARF2_Internal_LineInfo): Add li_address_size and
	li_segment_size fields.
	* dwarf.c (read_debug_line_header): Record the address size and
	segment selector size values (if present) in the lineinfo
	structure.
	(display_formatted_table): Warn if the format count is empty but
	the table itself is not empty.
	Display the format count and entry count at the start of the table
	dump.
	(display_debug_lines_raw): Display the address size and segement
	selector size fields, if present.
	* testsuite/binutils-all/dw5.W: Update expected output.

gas	* dwarf2dbg.c (DWARF2_FILE_TIME_NAME): Default to -1.
	(DWARF2_FILE_SIZE_NAME): Default to -1.
	(DWARF2_LINE_VERSION): Default to the current dwarf level or 3,
	whichever is higher.
	(DWARF2_LINE_MAX_OPS_PER_INSN): Provide a default value of 1.
	(NUM_MD5_BYTES): Define.
	(struct file entry): Add md5 field.
	(get_filenum): Delete and replace with...
	(get_basename): New function.
	(get_directory_table_entry): New function.
	(allocate_filenum): New function.
	(allocate_filename_to_slot): New function.
	(dwarf2_where): Use new functions.
	(dwarf2_directive_filename): Add support for extended .file
	pseudo-op.
	(dwarf2_directive_loc): Allow the use of file number zero with
	DWARF 5 or higher.
	(out_file_list): Rename to...
	(out_dir_and_file_list): Add DWARF 5 support.
	(out_debug_line): Emit extra values into the section header for
	DWARF 5.
	(out_debug_str): Allow for file 0 to be used with DWARF 5.
	* doc/as.texi (.file): Update the description of this pseudo-op.
	* testsuite/gas/elf-dwarf-5-file0.s: Add more lines.
	* testsuite/gas/elf-dwarf-5-file0.d: Update expected dump output.
	* testsuite/gas/lns/lns-diag-1.l: Update expected error message.
	* NEWS: Mention the new feature.

1 files changed, 17 insertions, 1 deletions

diff --git a/gas/doc/as.texi b/gas/doc/as.texi
index 711578f..0a6727e 100644
--- a/gas/doc/as.texi
+++ b/gas/doc/as.texi
@@ -5366,13 +5366,29 @@ to the @code{.debug_line} file name table.  The syntax is:
 
 The @var{fileno} operand should be a unique positive integer to use as the
 index of the entry in the table.  The @var{filename} operand is a C string
-literal.
+literal enclosed in double quotes.  The @var{filename} can include directory
+elements.  If it does, then the directory will be added to the directory table
+and the basename will be added to the file table.
 
 The detail of filename indices is exposed to the user because the filename
 table is shared with the @code{.debug_info} section of the DWARF2 debugging
 information, and thus the user must know the exact indices that table
 entries will have.
 
+If DWARF-5 support has been enabled via the @option{-gdwarf-5} option then
+an extended version of the @code{file} is also allowed:
+
+@smallexample
+.file @var{fileno} [@var{dirname}] @var{filename} [md5 @var{value}]
+@end smallexample
+
+With this version a separate directory name is allowed, although if this is
+used then @var{filename} should not contain any directory components.  In
+addtion an md5 hash value of the contents of @var{filename} can be provided.
+This will be stored in the the file table as well, and can be used by tools
+reading the debug information to verify that the contents of the source file
+match the contents of the compiled file.
+
 @node Fill
 @section @code{.fill @var{repeat} , @var{size} , @var{value}}