Add DWARF 5 support in gold.

elfcpp/
	PR gold/27246
	* dwarf.h (enum DW_LNCT): Add line number table content type codes.
	(enum DW_LINE_OPS): Reformat.
	(enum DW_LINE_EXTENDED_OPS): Reformat.
	(enum DW_CHILDREN): Reformat.
	(enum DW_RLE): Add range list entry types.
	(enum DW_SECT): Update values for DWARF 5.

gold/
	PR gold/27246
	* dwarf_reader.cc (Dwarf_abbrev_table::do_get_abbrev): Handle
	DW_FORM_implicit_const.
	(Dwarf_ranges_table::read_ranges_table): Add version parameter;
	Adjust all callers.  Look for .debug_rnglists section if DWARF 5.
	(Dwarf_ranges_table::read_range_list_v5): New method.
	(Dwarf_die::read_attributes): Handle new DWARF 5 DW_FORM codes.
	(Dwarf_die::skip_attributes): Likewise.
	(Dwarf_info_reader::do_parse): Support DWARF 5 unit header format.
	(Dwarf_info_reader::read_3bytes_from_pointer): New method.
	(Sized_dwarf_line_info::Sized_dwarf_line_info): Initialize
	str_buffer_, str_buffer_start, reloc_map_, line_number_map_.
	Look for .debug_line_str section.
	(Sized_dwarf_line_info::read_header_prolog): Support DWARF 5 prolog.
	(Sized_dwarf_line_info::read_header_tables): Rename to...
	(Sized_dwarf_line_info::read_header_tables_v2): ... this.
	(Sized_dwarf_line_info::read_header_tables_v5): New method.
	(Sized_dwarf_line_info::process_one_opcode): Insert missing "this->".
	Change advance_line to signed int64_t.
	(Sized_dwarf_line_info::read_lines): Add endptr parameter; adjust
	callers.  Insert missing "this->".
	(Sized_dwarf_line_info::read_line_mappings): Support DWARF 5.
	(Sized_dwarf_line_info::do_addr2line): Add debug code.
	* dwarf_reader.h (Dwarf_abbrev_table::Attribute): Add implicit_const
	field. Adjust constructor.
	(Dwarf_abbrev_table::add_sttribute): Add implicit_const parameter.
	(Dwarf_ranges_table::read_ranges_table): Add version parameter.
	(Dwarf_ranges_table::read_range_list_v5): New method.
	(Dwarf_die): Remove unused attr_off field.
	(Dwarf_info_reader::Dwarf_info_reader): Initialize unit_type_ field.
	(Dwarf_info_reader::is_type_unit): New method.
	(Dwarf_info_reader::read_3bytes_from_pointer): New method.
	(Dwarf_info_reader::read_range_list): Call read_range_list_v5 for
	DWARF 5 range lists.
	(Dwarf_info_reader::is_type_unit_): Remove.
	(Dwarf_info_reader::unit_type_): New field.
	(Sized_dwarf_line_info::~Sized_dwarf_line_info): Delete
	str_buffer_start_.
	(Sized_dwarf_line_info::read_header_tables): Rename to...
	(Sized_dwarf_line_info::read_header_tables_v2): ... this.
	(Sized_dwarf_line_info::read_header_tables_v5): New method.
	(Sized_dwarf_line_info::read_lines): Add endptr parameter.
	(Sized_dwarf_line_info::Dwarf_line_infoHeader): Add address_size field.
	(Sized_dwarf_line_info::str_buffer_): New field.
	(Sized_dwarf_line_info::str_buffer_end_): New field.
	(Sized_dwarf_line_info::str_buffer_start_): New field.
	(Sized_dwarf_line_info::end_of_header_length_): New field.
	(Sized_dwarf_line_info::end_of_unit_): New field.

2 files changed, 71 insertions, 28 deletions

diff --git a/elfcpp/ChangeLog b/elfcpp/ChangeLog
index 069b7dc..afc32c9 100644
--- a/elfcpp/ChangeLog
+++ b/elfcpp/ChangeLog
@@ -1,3 +1,13 @@
+2021-03-19  Cary Coutant  <ccoutant@gmail.com>
+
+	PR gold/27246
+	* dwarf.h (enum DW_LNCT): Add line number table content type codes.
+	(enum DW_LINE_OPS): Reformat.
+	(enum DW_LINE_EXTENDED_OPS): Reformat.
+	(enum DW_CHILDREN): Reformat.
+	(enum DW_RLE): Add range list entry types.
+	(enum DW_SECT): Update values for DWARF 5.
+
 2021-01-09  Nick Clifton  <nickc@redhat.com>
 
 	* 2.36 release branch crated.
diff --git a/elfcpp/dwarf.h b/elfcpp/dwarf.h
index e24347f..c9a9e02 100644
--- a/elfcpp/dwarf.h
+++ b/elfcpp/dwarf.h
@@ -152,35 +152,48 @@ enum DW_EH_PE
   DW_EH_PE_indirect = 0x80
 };
 
+// Line number table content type codes.
+
+enum DW_LNCT
+{
+  DW_LNCT_path            = 0x1,
+  DW_LNCT_directory_index = 0x2,
+  DW_LNCT_timestamp       = 0x3,
+  DW_LNCT_size            = 0x4,
+  DW_LNCT_MD5             = 0x5,
+  DW_LNCT_lo_user         = 0x2000,
+  DW_LNCT_hi_user         = 0x3fff
+};
+
 // Line number opcodes.
 
 enum DW_LINE_OPS
 {
-  DW_LNS_extended_op = 0,
-  DW_LNS_copy = 1,
-  DW_LNS_advance_pc = 2,
-  DW_LNS_advance_line = 3,
-  DW_LNS_set_file = 4,
-  DW_LNS_set_column = 5,
-  DW_LNS_negate_stmt = 6,
-  DW_LNS_set_basic_block = 7,
-  DW_LNS_const_add_pc = 8,
-  DW_LNS_fixed_advance_pc = 9,
+  DW_LNS_extended_op        = 0x00,
+  DW_LNS_copy               = 0x01,
+  DW_LNS_advance_pc         = 0x02,
+  DW_LNS_advance_line       = 0x03,
+  DW_LNS_set_file           = 0x04,
+  DW_LNS_set_column         = 0x05,
+  DW_LNS_negate_stmt        = 0x06,
+  DW_LNS_set_basic_block    = 0x07,
+  DW_LNS_const_add_pc       = 0x08,
+  DW_LNS_fixed_advance_pc   = 0x09,
   // DWARF 3.
-  DW_LNS_set_prologue_end = 10,
-  DW_LNS_set_epilogue_begin = 11,
-  DW_LNS_set_isa = 12
+  DW_LNS_set_prologue_end   = 0x0a,
+  DW_LNS_set_epilogue_begin = 0x0b,
+  DW_LNS_set_isa            = 0x0c
 };
 
 // Line number extended opcodes.
 
 enum DW_LINE_EXTENDED_OPS
 {
-  DW_LNE_end_sequence = 1,
-  DW_LNE_set_address = 2,
-  DW_LNE_define_file = 3,
+  DW_LNE_end_sequence                = 0x01,
+  DW_LNE_set_address                 = 0x02,
+  DW_LNE_define_file                 = 0x03,
   // DWARF4.
-  DW_LNE_set_discriminator = 4,
+  DW_LNE_set_discriminator           = 0x04,
   // HP extensions.
   DW_LNE_HP_negate_is_UV_update      = 0x11,
   DW_LNE_HP_push_context             = 0x12,
@@ -191,13 +204,15 @@ enum DW_LINE_EXTENDED_OPS
   DW_LNE_HP_negate_post_semantics    = 0x17,
   DW_LNE_HP_negate_function_exit     = 0x18,
   DW_LNE_HP_negate_front_end_logical = 0x19,
-  DW_LNE_HP_define_proc              = 0x20
+  DW_LNE_HP_define_proc              = 0x20,
+  DW_LNE_lo_user                     = 0x80,
+  DW_LNE_hi_user                     = 0xff
 };
 
 enum DW_CHILDREN
 {
-  DW_CHILDREN_no		     =0x00,
-  DW_CHILDREN_yes		     =0x01
+  DW_CHILDREN_no  = 0,
+  DW_CHILDREN_yes = 1
 };
 
 // Source language names and codes.
@@ -247,20 +262,38 @@ enum DW_LANG
   DW_LANG_HP_Assembler = 0x8007
 };
 
+// Range list entry kinds in .debug_rnglists* section.
+
+enum DW_RLE
+{
+  DW_RLE_end_of_list   = 0x00,
+  DW_RLE_base_addressx = 0x01,
+  DW_RLE_startx_endx   = 0x02,
+  DW_RLE_startx_length = 0x03,
+  DW_RLE_offset_pair   = 0x04,
+  DW_RLE_base_address  = 0x05,
+  DW_RLE_start_end     = 0x06,
+  DW_RLE_start_length  = 0x07
+};
+
 // DWARF section identifiers used in the package format.
 // Extensions for Fission.  See http://gcc.gnu.org/wiki/DebugFissionDWP.
+// Added (with changes) in DWARF 5.
 
 enum DW_SECT
 {
-  DW_SECT_INFO = 1,
-  DW_SECT_TYPES = 2,
-  DW_SECT_ABBREV = 3,
-  DW_SECT_LINE = 4,
-  DW_SECT_LOC = 5,
+  DW_SECT_INFO        = 1,
+  DW_SECT_ABBREV      = 3,
+  DW_SECT_LINE        = 4,
+  DW_SECT_LOCLISTS    = 5,
   DW_SECT_STR_OFFSETS = 6,
-  DW_SECT_MACINFO = 7,
-  DW_SECT_MACRO = 8,
-  DW_SECT_MAX = DW_SECT_MACRO,
+  DW_SECT_MACINFO     = 7,
+  DW_SECT_RNGLISTS    = 8,
+  DW_SECT_MAX = DW_SECT_RNGLISTS,
+  // These were used only for the experimental Fission support in DWARF 4.
+  DW_SECT_TYPES       = 2,
+  DW_SECT_LOC         = 5,
+  DW_SECT_MACRO       = 8
 };
 
 } // End namespace elfcpp.