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Sometimes we can see const references in DWARF. But then, a reference
is always const, so that qualified reference is redundant.
Furthermore, having that construct make its way into the internal
representation can cause awkward diagnostics.
The DWARF reader was thus eliding such redundant qualifiers in the
function "maybe_strip_qualification". It was doing so by stripping
the qualifier from the qualified type. So const reference, for
instance, becomes a (non-qualified) reference. In that case, we are
turning a qualified type into a non-qualified one.
But as the accompanying problem report suggests, this can cause issues
during the DWARF parsing. This is because a given Debug Information
Entry (DIE) of qualified type kind can be referenced elsewhere, by
another type. That other type expects that DIE to be a qualified
type. And libabigail's DWARF reader code enforces that. So the
internal representation of a type resulting from a qualified type DIE
must be a qualified type itself.
So the way the function "maybe_strip_qualification" was doing the
redundancy elision was wrong. This patch fixes that by keeping the
type qualified, but introducing a "no-op" qualifier. Actually, the IR
already has that "no-op" qualifier: abigail::ir::qualified_type_def::CV_NONE.
So now "maybe_strip_qualification" just turns the CV_CONST qualifier
into a CV_NONE one when the former is redundant.
Now that the libabigail type system actually *has* types qualified
with this no-op qualifier, we need to handle things like printing the
name of such qualified types. When we are printing the name of the
type for internal reasons (i.e, for type canonicalization purposes) we
need to make a difference between the name of a no-op qualified type
and the name of the underlying type of the qualified type, otherwise,
the canonicalizer wrongly considers the two types as being equal. But
then when we are printing the name of the no-op qualified type for
diagnostics reasons, then the name is the same as the name of its
underlying unqualified type.
* src/abg-dwarf-reader.cc (maybe_strip_qualification): Do not nuke
the qualified type. Rather, just turn the redundant const
qualifier into a no-op one.
* src/abg-comparison.cc (compute_diff_for_types): Look through
no-op qualified types.
* include/abg-ir.h
(decl_base::{peek,set}_temporary_qualified_name): Declare new
accessors.
* src/abg-ir.cc (decl_base::priv::temporary_qualified_name_): New
data member.
(decl_base::{peek,set}_temporary_qualified_name): Define new
accessors.
(qualified_type_def::priv::{temporary_internal_name_,
internal_name}): New data members.
(qualified_type_def::build_name): For a no-op qualified type, the
internal name (which contains the 'none' qualifier) is different
from the non-internal name.
(qualified_type_def::get_qualified_name): Handle temporary names
and non-temporary names in two different caches. Also handle
internal and non-internal names in two different caches. This
makes four different caches.
(qualified_name_setter::do_update): Do not touch the non-internal,
non-temporary qualified name cache if the qualified parent name is
empty.
* tools/abidw.cc (main): change --check-alternate-debug-info to
make it *not* display the name/path to the alternate debug info,
when it's found. Rather, only
--check-alternate-debug-info-base-name keeps displaying the base
name of the alternate debug info.
* tests/data/test-alt-dwarf-file/test1-libgromacs-debug-dir/*: New
test material.
* tests/data/Makefile.am: Add the new test material to the build
system.
* tests/test-alt-dwarf-file.cc (in_out_specs): Take the new test
input into account.
* tests/data/test-read-dwarf/test1.abi: Adjust.
* tests/data/test-read-dwarf/test7.so.abi: Likewise.
* tests/data/test-read-dwarf/test10-pr18818-gcc.so.abi: Likewise.
* tests/data/test-read-dwarf/test11-pr18828.so.abi: Likewise.
* tests/data/test-read-dwarf/test14-pr18893.so.abi: Likewise.
* tests/data/test-read-dwarf/test15-pr18892.so.abi: Likewise.
* tests/data/test-read-dwarf/test16-pr18904.so.abi: Likewise.
* tests/data/test-read-dwarf/test17-pr19027.so.abi: Likewise.
* tests/data/test-read-dwarf/test18-pr19037-libvtkRenderingLIC-6.1.so.abi:
Likewise.
* tests/data/test-read-dwarf/test19-pr19023-libtcmalloc_and_profiler.so.abi:
Likewise.
* tests/data/test-read-dwarf/test20-pr19025-libvtkParallelCore-6.1.so.abi:
Likewise.
* tests/data/test-read-dwarf/test22-pr19097-libstdc++.so.6.0.17.so.abi:
Likewise.
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
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36 B
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found the alternate debug info file
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