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When comparing internal decl names (as part of decl comparison), we
need to take into account the fact that a given decl might be
anonymous and that it might have anonymous scopes in its tree of
containing scopes.
For instance, "__anonymous_struct__1::foo" and
"__anonymous_struct__2::foo" are considered equivalent.
So are "__anonymous_struct__1::foo::__anonymous_struct__2::bar" and
"__anonymous_struct__10::foo::__anonymous_struct__11::bar".
But "__anonymous_struct__1::bar::__anonymous_struct__2::baz" and
"__anonymous_struct__10::foo::__anonymous_struct__11::bar" are not.
This patch introduces the function tools_utils::decl_names_equal that
compares fully qualified names by taking into account anonymous
component names.
That function is thus used in the equals() function overload for
decl_base types. Because tools_utils::decl_names_equal compares strings the
usual way (character by character) it's slower than comparing
instances of interned_string in a O(1) time. So the patch carefully
tries to use tools_utils::decl_names_equal sparringly; that is, it
uses it only when we are looking at decls that have some anonymous
scope. That way, we use the fast interned_string comparison most of
the time. By doing this, we barely see any performance degradation
while running abidw --noout on a full blown vmlinux binary.
* include/abg-ir.h (decl_base::{get_has_anonymous_parent,
set_has_anonymous_parent,
get_is_anonymous_or_has_anonymous_parent}): Declare new member
functions.
* src/abg-ir.cc (decl_base::priv::has_anonymous_parent_): Define
new data member.
(decl_base::priv): Initialize the new data member.
(decl_base::{get_has_anonymous_parent, set_has_anonymous_parent,
get_is_anonymous_or_has_anonymous_parent}): Define new member
functions.
(equals): In the overload for decl_base, use the new
decl_names_equal for decls that have anonymous scopes.
(scope_decl::add_member_decl): Propagate the
decl_base::has_anonymous_parent_ property.
* include/abg-tools-utils.h
(get_anonymous_struct_internal_name_prefix)
(get_anonymous_union_internal_name_prefix)
(get_anonymous_enum_internal_name_prefix, decl_names_equal):
Declare new functions.
* src/abg-comp-filter.cc (has_harmless_name_change): Handle the
case where the name change is actually from an anonymous name to
another one, using the new decl_names_equal function.
* src/abg-dwarf-reader.cc
(get_internal_anonymous_die_prefix_name): Renamed
get_internal_anonynous_die_base_name into this. Use the new
get_anonymous_{struct, union, enum}_internal_name_prefix functions
here.
(get_internal_anonymous_die_name, die_qualified_type_name)
(build_enum_type, add_or_update_class_type)
(add_or_update_union_type): Adjust.
* src/abg-tools-utils.cc (get_anonymous_struct_internal_name_prefix)
(get_anonymous_union_internal_name_prefix)
(get_anonymous_enum_internal_name_prefix, decl_names_equal):
Define new functions.
* tests/test-tools-utils.cc: New test file.
* tests/Makefile.am: Add new runtesttoolsutils test, built from
test-tools-utils.cc.
* tests/data/test-diff-dwarf/test46-rust-report-0.txt: Adjust.
* tests/data/test-diff-pkg/spice-server-0.12.4-19.el7.x86_64-0.12.8-1.el7.x86_64-report-3.txt:
Likewise.
* tests/data/test-read-dwarf/PR22122-libftdc.so.abi: Likewise.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
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|---|---|---|
| .. | ||
| abg-comp-filter.h | ||
| abg-comparison.h | ||
| abg-config.h | ||
| abg-corpus.h | ||
| abg-diff-utils.h | ||
| abg-dwarf-reader.h | ||
| abg-fwd.h | ||
| abg-hash.h | ||
| abg-ini.h | ||
| abg-interned-str.h | ||
| abg-ir.h | ||
| abg-libxml-utils.h | ||
| abg-libzip-utils.h | ||
| abg-reader.h | ||
| abg-reporter.h | ||
| abg-sptr-utils.h | ||
| abg-suppression.h | ||
| abg-tools-utils.h | ||
| abg-traverse.h | ||
| abg-version.h.in | ||
| abg-viz-common.h | ||
| abg-viz-dot.h | ||
| abg-viz-svg.h | ||
| abg-workers.h | ||
| abg-writer.h | ||
| Makefile.am | ||