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* [Bug c++/16841] New: virtual inheritance via typedef cannot find base @ 2014-04-13 16:30 dblaikie at gmail dot com 2014-04-13 16:32 ` [Bug c++/16841] " dblaikie at gmail dot com ` (4 more replies) 0 siblings, 5 replies; 6+ messages in thread From: dblaikie at gmail dot com @ 2014-04-13 16:30 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=16841 Bug ID: 16841 Summary: virtual inheritance via typedef cannot find base Product: gdb Version: unknown Status: NEW Severity: normal Priority: P2 Component: c++ Assignee: unassigned at sourceware dot org Reporter: dblaikie at gmail dot com gdb.cp/impl-this.exp run with Clang exposes some issues with GDB's handling of inheritance and typedefs. A simplified repro looks something like this: struct base { int i; }; typedef base tbase; struct derived: virtual tbase { void func() { } }; int main() { derived().func(); } break derived::func (gdb) p i $5 = 0 (gdb) p derived::i Internal error: non-aggregate type to value_struct_elt_for_reference (gdb) p base::i $6 = 4196392 (gdb) p tbase::i $7 = 4196392 (gdb) p derived::base::i No type "base" within class or namespace "derived". (gdb) p derived::tbase::i $8 = 4196392 Ideally, all of those expressions would print out the same value. (even with GCC's output, "p derived::i" prints out garbage (4196392 as well, I think)). Without using the typedef for inheritance, but leaving a use in the file (just declaring a global variable of the typedef type "tbase x;") the following output comes from GDB with either Clang or GCC: (gdb) p i $1 = 0 (gdb) p derived::i $2 = 4196392 (gdb) p base::i $3 = 0 (gdb) p tbase::i $4 = 0 (gdb) p derived::base::i $5 = 0 (gdb) p derived::tbase::i No type "tbase" within class or namespace "derived". If the intent is to match the C++ language rules, all of these expressions should print out the same value. When the virtual inheritance was indirect (introducing a "virt" struct, and having "base" derive virtually from "virt" (and "derived" derive non-virtually from "base")) I got a different failure in many of these expressions: "Cannot access memory at address 0x0" but I'm guessing that's just a different manifestation of the same issue) -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/16841] virtual inheritance via typedef cannot find base 2014-04-13 16:30 [Bug c++/16841] New: virtual inheritance via typedef cannot find base dblaikie at gmail dot com @ 2014-04-13 16:32 ` dblaikie at gmail dot com 2014-04-13 16:33 ` dblaikie at gmail dot com ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: dblaikie at gmail dot com @ 2014-04-13 16:32 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=16841 --- Comment #1 from David Blaikie <dblaikie at gmail dot com> --- Created attachment 7551 --> https://sourceware.org/bugzilla/attachment.cgi?id=7551&action=edit clang example showing typedef in inheritance -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/16841] virtual inheritance via typedef cannot find base 2014-04-13 16:30 [Bug c++/16841] New: virtual inheritance via typedef cannot find base dblaikie at gmail dot com 2014-04-13 16:32 ` [Bug c++/16841] " dblaikie at gmail dot com @ 2014-04-13 16:33 ` dblaikie at gmail dot com 2014-04-13 16:35 ` dblaikie at gmail dot com ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: dblaikie at gmail dot com @ 2014-04-13 16:33 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=16841 --- Comment #2 from David Blaikie <dblaikie at gmail dot com> --- Oh, and there's GCC bug 60833 to track the fact that GCC doesn't emit the typedef here. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/16841] virtual inheritance via typedef cannot find base 2014-04-13 16:30 [Bug c++/16841] New: virtual inheritance via typedef cannot find base dblaikie at gmail dot com 2014-04-13 16:32 ` [Bug c++/16841] " dblaikie at gmail dot com 2014-04-13 16:33 ` dblaikie at gmail dot com @ 2014-04-13 16:35 ` dblaikie at gmail dot com 2014-04-24 22:47 ` dblaikie at gmail dot com 2022-10-04 8:22 ` blarsen at redhat dot com 4 siblings, 0 replies; 6+ messages in thread From: dblaikie at gmail dot com @ 2014-04-13 16:35 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=16841 David Blaikie <dblaikie at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dje at google dot com, | |echristo at gmail dot com -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/16841] virtual inheritance via typedef cannot find base 2014-04-13 16:30 [Bug c++/16841] New: virtual inheritance via typedef cannot find base dblaikie at gmail dot com ` (2 preceding siblings ...) 2014-04-13 16:35 ` dblaikie at gmail dot com @ 2014-04-24 22:47 ` dblaikie at gmail dot com 2022-10-04 8:22 ` blarsen at redhat dot com 4 siblings, 0 replies; 6+ messages in thread From: dblaikie at gmail dot com @ 2014-04-24 22:47 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=16841 --- Comment #3 from David Blaikie <dblaikie at gmail dot com> --- See PR14819 for the original bug/implementation details for this test and functionality it is testing. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/16841] virtual inheritance via typedef cannot find base 2014-04-13 16:30 [Bug c++/16841] New: virtual inheritance via typedef cannot find base dblaikie at gmail dot com ` (3 preceding siblings ...) 2014-04-24 22:47 ` dblaikie at gmail dot com @ 2022-10-04 8:22 ` blarsen at redhat dot com 4 siblings, 0 replies; 6+ messages in thread From: blarsen at redhat dot com @ 2022-10-04 8:22 UTC (permalink / raw) To: gdb-prs https://sourceware.org/bugzilla/show_bug.cgi?id=16841 B. Larsen <blarsen at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |blarsen at redhat dot com Resolution|--- |FIXED Status|NEW |RESOLVED --- Comment #6 from B. Larsen <blarsen at redhat dot com> --- My newest commit, 2820f08f2331820808ac2f54d8e3619f36ea258b, fixes this issue -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-10-04 8:22 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-04-13 16:30 [Bug c++/16841] New: virtual inheritance via typedef cannot find base dblaikie at gmail dot com 2014-04-13 16:32 ` [Bug c++/16841] " dblaikie at gmail dot com 2014-04-13 16:33 ` dblaikie at gmail dot com 2014-04-13 16:35 ` dblaikie at gmail dot com 2014-04-24 22:47 ` dblaikie at gmail dot com 2022-10-04 8:22 ` blarsen at redhat dot com
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