The contents of include/dwarf2.def have diverged between the gcc and
the binutils repositories. Currently, it's impossible to build a combined
tree, as GCC won't build with the binutils version of dwarf2.def and binutils
won't build with the gcc version. This patch realigns this file by copying
the defintion of DW_CFA_AARCH64_negate_ra_state_with_pc from binutils,
restoring the ability to build a combined source tree.
2025-02-11 Roger Sayle <roger@nextmovesoftware.com>
include/ChangeLog
* dwarf2.def (DW_CFA_AARCH64_negate_ra_state_with_pc): Define.
DWARF has voted in recently https://dwarfstd.org/issues/241209.1.html ,
which is basically just a guarantee that the DWARF 6 draft
DW_AT_language_{name,version} attribute codes and content of
https://dwarfstd.org/languages-v6.html can be used as an extension
in DWARF 5 and won't be changed.
So, this patch is an alternative to the
https://gcc.gnu.org/pipermail/gcc-patches/2024-November/669671.html
patch, which had the major problem that it required changing all the
DWARF consumers to be able to debug C17 or later or C++17 or later
sources.
This patch uses still DWARF 5 DW_LANG_C11 or DW_LANG_C_plus_plus_14,
the latest code in DWARF 5 proper, so all DWARF 5 capable consumers
should be able to deal with that, but additionally emits the
DWARF 6 attributes so that newer DWARF consumers can see it isn't
just C++14 but say C++23 or C11 but C23. Consumers which don't know
those DWARF 6 attributes would just ignore them. This is like any other
-gno-strict-dwarf extension, except that normally we emit say DWARF 5
codes where possible only after DWARF 5 is released, while in this case
there is a guarantee it can be used before DWARF 6 is released.
2025-01-08 Jakub Jelinek <jakub@redhat.com>
include/
* dwarf2.h (enum dwarf_source_language): Fix comment pasto.
(enum dwarf_source_language_name): New type.
* dwarf2.def (DW_AT_language_name, DW_AT_language_version): New
DWARF 6 codes.
gcc/
* dwarf2out.cc (break_out_comdat_types): Copy over
DW_AT_language_{name,version} if present.
(output_skeleton_debug_sections): Remove also
DW_AT_language_{name,version}.
(gen_compile_unit_die): For C17, C23, C2Y, C++17, C++20, C++23
and C++26 emit for -gdwarf-5 -gno-strict-dwarf also
DW_AT_language_{name,version} attributes.
gcc/testsuite/
* g++.dg/debug/dwarf2/lang-cpp17.C: Add -gno-strict-dwarf to
dg-options. Check also for DW_AT_language_{name,version} values.
* g++.dg/debug/dwarf2/lang-cpp20.C: Likewise.
* g++.dg/debug/dwarf2/lang-cpp23.C: New test.
I've reimplemented the .debug_names code in GDB -- it was quite far
from being correct, and the new implementation is much closer to what
is specified by DWARF.
However, the new writer in GDB needs to emit some symbol properties,
so that the reader can be fully functional. This patch adds a few new
DW_IDX_* constants, and tries to document the existing extensions as
well. (My patch series add more documentation of these to the GDB
manual as well.)
include/ChangeLog
2023-12-10 Tom Tromey <tom@tromey.com>
* dwarf2.def (DW_IDX_GNU_internal, DW_IDX_GNU_external): Comment.
(DW_IDX_GNU_main, DW_IDX_GNU_language, DW_IDX_GNU_linkage_name):
New constants.
This adds a get_DW_UT_name function to dwarfnames using dwarf2.def
for use in binutils readelf to show the unit types in a DWARF5 header.
Also remove DW_CIE_VERSION which was already removed in binutils/gdb
and is not used in gcc.
include/ChangeLog:
* dwarf2.def: Add DWARF5 Unit type header encoding macros
DW_UT_FIRST, DW_UT and DW_UT_END.
* dwarf2.h (enum dwarf_unit_type): Removed and define using
DW_UT_FIRST, DW_UT and DW_UT_END macros.
(DW_CIE_VERSION): Removed.
(get_DW_UT_name): New function declaration.
libiberty/ChangeLog:
* dwarfnames.c (get_DW_UT_name): Define using DW_UT_FIRST, DW_UT
and DW_UT_END.
This patch introduces an option to enable the generation of location
views along with location lists. The exact format depends on the
DWARF version: it can be a separate attribute (DW_AT_GNU_locviews) or
(DW_LLE_view_pair) entries in DWARF5+ loclists.
Line number tables are also affected. If the assembler is found, at
compiler build time, to support .loc views, we use them and
assembler-computed view labels, otherwise we output compiler-generated
line number programs with conservatively-computed view labels. In
either case, we output view information next to line number changes
when verbose assembly output is requested.
This patch requires an LVU patch that modifies the exported API of
final_scan_insn. It also expects the entire SFN patchset to be
installed first, although SFN is not a requirement for LVU.
for include/ChangeLog
* dwarf2.def (DW_AT_GNU_locviews): New.
* dwarf2.h (enum dwarf_location_list_entry_type): Add
DW_LLE_GNU_view_pair.
(DW_LLE_view_pair): Define.
for gcc/ChangeLog
* common.opt (gvariable-location-views): New.
(gvariable-location-views=incompat5): New.
* config.in: Rebuilt.
* configure: Rebuilt.
* configure.ac: Test assembler for view support.
* dwarf2asm.c (dw2_asm_output_symname_uleb128): New.
* dwarf2asm.h (dw2_asm_output_symname_uleb128): Declare.
* dwarf2out.c (var_loc_view): New typedef.
(struct dw_loc_list_struct): Add vl_symbol, vbegin, vend.
(dwarf2out_locviews_in_attribute): New.
(dwarf2out_locviews_in_loclist): New.
(dw_val_equal_p): Compare val_view_list of dw_val_class_view_lists.
(enum dw_line_info_opcode): Add LI_adv_address.
(struct dw_line_info_table): Add view.
(RESET_NEXT_VIEW, RESETTING_VIEW_P): New macros.
(DWARF2_ASM_VIEW_DEBUG_INFO): Define default.
(zero_view_p): New variable.
(ZERO_VIEW_P): New macro.
(output_asm_line_debug_info): New.
(struct var_loc_node): Add view.
(add_AT_view_list, AT_loc_list): New.
(add_var_loc_to_decl): Add view param. Test it against last.
(new_loc_list): Add view params. Record them.
(AT_loc_list_ptr): Handle loc and view lists.
(view_list_to_loc_list_val_node): New.
(print_dw_val): Handle dw_val_class_view_list.
(size_of_die): Likewise.
(value_format): Likewise.
(loc_list_has_views): New.
(gen_llsym): Set vl_symbol too.
(maybe_gen_llsym, skip_loc_list_entry): New.
(dwarf2out_maybe_output_loclist_view_pair): New.
(output_loc_list): Output view list or entries too.
(output_view_list_offset): New.
(output_die): Handle dw_val_class_view_list.
(output_dwarf_version): New.
(output_compilation_unit_header): Use it.
(output_skeleton_debug_sections): Likewise.
(output_rnglists, output_line_info): Likewise.
(output_pubnames, output_aranges): Update version comments.
(output_one_line_info_table): Output view numbers in asm comments.
(dw_loc_list): Determine current endview, pass it to new_loc_list.
Call maybe_gen_llsym.
(loc_list_from_tree_1): Adjust.
(add_AT_location_description): Create view list attribute if
needed, check it's absent otherwise.
(convert_cfa_to_fb_loc_list): Adjust.
(maybe_emit_file): Call output_asm_line_debug_info for test.
(dwarf2out_var_location): Reset views as needed. Precompute
add_var_loc_to_decl args. Call get_attr_min_length only if we have the
attribute. Set view.
(new_line_info_table): Reset next view.
(set_cur_line_info_table): Call output_asm_line_debug_info for test.
(dwarf2out_source_line): Likewise. Output view resets and labels to
the assembler, or select appropriate line info opcodes.
(prune_unused_types_walk_attribs): Handle dw_val_class_view_list.
(optimize_string_length): Catch it. Adjust.
(resolve_addr): Copy vl_symbol along with ll_symbol. Handle
dw_val_class_view_list, and remove it if no longer needed.
(hash_loc_list): Hash view numbers.
(loc_list_hasher::equal): Compare them.
(optimize_location_lists): Check whether a view list symbol is
needed, and whether the locview attribute is present, and
whether they match. Remove the locview attribute if no longer
needed.
(index_location_lists): Call skip_loc_list_entry for test.
(dwarf2out_finish): Call output_asm_line_debug_info for test.
Use output_dwarf_version.
* dwarf2out.h (enum dw_val_class): Add dw_val_class_view_list.
(struct dw_val_node): Add val_view_list.
* final.c (SEEN_NEXT_VIEW): New.
(set_next_view_needed): New.
(clear_next_view_needed): New.
(maybe_output_next_view): New.
(final_start_function): Rename to...
(final_start_function_1): ... this. Take pointer to FIRST,
add SEEN parameter. Emit param bindings in the initial view.
(final_start_function): Reintroduce SEEN-less interface.
(final): Rename to...
(final_1): ... this. Take SEEN parameter. Output final pending
next view at the end.
(final): Reintroduce seen-less interface.
(final_scan_insn): Output pending next view before switching
sections or ending a block. Mark the next view as needed when
outputting variable locations. Notify debug backend of section
changes, and of location view changes.
(rest_of_handle_final): Adjust.
* toplev.c (process_options): Autodetect value for debug variable
location views option. Warn on incompat5 without -gdwarf-5.
* doc/invoke.texi (gvariable-location-views): New.
(gvariable-location-views=incompat5): New.
(gno-variable-location-views): New.
From-SVN: r257510
A new vendor CFA DW_CFA_AARCH64_negate_ra_state was introduced for ARMv8.3-A
return address signing, it is multiplexing DW_CFA_GNU_window_save in CFA vendor
extension space.
This patch adds necessary code to make it available to external, the GDB
patch (https://sourceware.org/ml/gdb-patches/2017-08/msg00215.html) is intended
to use it.
A new DW_CFA_DUP for it is added in dwarf2.def. The use of DW_CFA_DUP is to
avoid duplicated case value issue when included in libiberty/dwarfnames.
Native x86 builds OK to make sure no macro expanding errors.
Committed on behalf of Jiong Wang.
include/
* dwarf2.def (DW_CFA_AARCH64_negate_ra_state): New DW_CFA_DUP.
* dwarf2.h (DW_CFA_DUP): New define.
libiberty/
* dwarfnames.c (DW_CFA_DUP): New define.
From-SVN: r252037
PR debug/77589
include/
* dwarf2.def (DW_OP_GNU_variable_value): New opcode.
gcc/
* dwarf2out.c (struct dw_loc_list_struct): Add noted_variable_value
bitfield.
(size_of_loc_descr): Handle DW_OP_GNU_variable_value.
(output_loc_operands): Handle DW_OP_call_ref and
DW_OP_GNU_variable_value.
(struct variable_value_struct): New type.
(struct variable_value_hasher): Likewise.
(variable_value_hash): New variable.
(string_types): Remove.
(copy_loc_descr): New function.
(add_loc_descr_to_each): Clarify comment. Use copy_loc_descr.
(prepend_loc_descr_to_each): New function.
(add_loc_list): Fix comment typo. Use prepend_loc_descr_to_each
instead of add_loc_descr_to_each if the first argument is single
location list and the second has multiple.
(resolve_args_picking_1): Handle DW_OP_GNU_variable_value.
(loc_list_from_tree_1): For early_dwarf, emit DW_OP_GNU_variable_value
when looking for variable value which doesn't have other location info.
(loc_list_from_tree): Formatting fix.
(gen_array_type_die): Simplify DW_AT_string_length handling.
(adjust_string_types): Remove.
(gen_subprogram_die): Don't call adjust_string_types nor test/set
string_types. Call resolve_variable_values.
(prune_unused_types_walk_loc_descr): Handle DW_OP_GNU_variable_value.
(resolve_addr_in_expr): Likewise. Add A argument.
(copy_deref_exprloc): Remove deref argument. Adjust for the
original expression being DW_OP_GNU_variable_value with optionally
DW_OP_stack_value after it instead of DW_OP_call4 with DW_OP_deref
optionally after it.
(optimize_string_length): Rework for DW_OP_GNU_variable_value.
(resolve_addr): Adjust optimize_string_length and resolve_addr_in_expr
callers. Set remove_AT_byte_size if removing DW_AT_string_length.
(variable_value_hasher::hash, variable_value_hasher::equal): New
methods.
(resolve_variable_value_in_expr, resolve_variable_value,
resolve_variable_values, note_variable_value_in_expr,
note_variable_value): New functions.
(dwarf2out_early_finish): Call note_variable_value on all toplevel
DIEs.
From-SVN: r245733
include/
* dwarf2.def (DW_OP_AARCH64_operation): Reserve the number 0xea.
(DW_CFA_GNU_window_save): Comments the multiplexing on AArch64.
Co-Authored-By: Jiong Wang <jiong.wang@arm.com>
From-SVN: r244055
This implements the DWARFv5 noreturn proposal:
http://dwarfstd.org/ShowIssue.php?issue=140331.1
TREE_THIS_VOLATILE on a FUNCTION_DECL node means the function does not
return normally. This catches the traditional noreturn GNU attribute,
the C11 _Noreturn keyword and the C++11 [[noreturn]] attribute.
This relies on the DW_AT_noreturn constant defined in the DWARFv5 DRAFT:
http://www.dwarfstd.org/doc/dwarf5.20141029.pdf
gcc/ChangeLog
* dwarf2out.c (gen_subprogram_die): Add DW_AT_noreturn when the
function decl has TREE_THIS_VOLATILE.
gcc/testsuite/ChangeLog
* g++.dg/debug/dwarf2/noreturn-function.C: New test.
* gcc.dg/debug/dwarf2/noreturn-function-attribute.c: Likewise.
* gcc.dg/debug/dwarf2/noreturn-function-keyword.c: Likewise.
include/ChangeLog
* dwarf2.def (DW_AT_noreturn): New DWARF5 attribute.
From-SVN: r218075
