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cb25fdbb76
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
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