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gdb: remove assertion in psymbol_functions::expand_symtabs_matching

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psymtab_to_symtab is documented as possibly returning nullptr, if the
primary symtab of the partial symtab has no symbols.  However,
psymbol_functions::expand_symtabs_matching asserts that the result of
psymtab_to_symtab as non-nullptr.

I caught this assert by trying the CTF symbol reader on a library I
built with -gctf:

    $ ./gdb --data-directory=data-directory /tmp/babeltrace-ctf/src/lib/.libs/libbabeltrace2.so.0.0.0
    ...
    Reading symbols from /tmp/babeltrace-ctf/src/lib/.libs/libbabeltrace2.so.0.0.0...
    (gdb) maintenance expand-symtabs
    /home/simark/src/binutils-gdb/gdb/psymtab.c:1142: internal-error: expand_symtabs_matching: Assertion `symtab != nullptr' failed.

The "symtab" in question is:

    $  readelf --ctf=.ctf /tmp/babeltrace-ctf/src/lib/.libs/libbabeltrace2.so.0.0.0
    ...
    CTF archive member: /home/simark/src/babeltrace/src/lib/graph/component-descriptor-set.c:

      Header:
        Magic number: 0xdff2
        Version: 4 (CTF_VERSION_3)
        Flags: 0xe (CTF_F_NEWFUNCINFO, CTF_F_IDXSORTED, CTF_F_DYNSTR)
        Parent name: .ctf
        Compilation unit name: /home/simark/src/babeltrace/src/lib/graph/component-descriptor-set.c
        Type section:       0x0 -- 0x13 (0x14 bytes)
        String section:     0x14 -- 0x5f (0x4c bytes)

      Labels:

      Data objects:

      Function objects:

      Variables:

      Types:
        0x80000001: (kind 5) bt_bool (*) (const bt_value *) (aligned at 0x8)

      Strings:
        0x0:
        0x1: .ctf
        0x6: /home/simark/src/babeltrace/src/lib/graph/component-descriptor-set.c

It contains a single type, and it is skipped by ctf_add_type_cb, because
an identical type was already seen earlier in this objfile.  As a
result, no compunit_symtab is created.

Change psymbol_functions::expand_symtabs_matching to expect that
psymtab_to_symtab can return nullptr.

Another possibility would be to make the CTF symbol reader always create
a compunit_symtab, even if there are no symbols in it (like the DWARF
parser does), but so far I don't see any advantage in doing so.

Change-Id: Ic43c38202c838a5eb87630ed1fd61d33528164f4
This commit is contained in:
Simon Marchi 2022-03-31 16:38:33 -04:00
parent 7b01c1cc1d
commit cb25fdbb76
1 changed files with 3 additions and 6 deletions
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9
gdb/psymtab.c
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@ -1136,13 +1136,10 @@ psymbol_functions::expand_symtabs_matching
*psym_lookup_name,
symbol_matcher))
{
struct compunit_symtab *symtab =
psymtab_to_symtab (objfile, ps);
compunit_symtab *cust = psymtab_to_symtab (objfile, ps);
gdb_assert (symtab != nullptr);
if (expansion_notify != NULL)
if (!expansion_notify (symtab))
if (cust != nullptr && expansion_notify != nullptr)
if (!expansion_notify (cust))
return false;
}
}