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There are a couple of issues you run into when you start getting into
more complex names, especially with regards to function local statics.
When you've got something like:
int x() {
static int n = 0;
return n;
}
Then this needs to demangle to something like
int `int __cdecl x()'::`1'::n
The nested mangled symbols (e.g. `int __cdecl x()` in the above
example) also share state with regards to back-referencing, so
we need to be able to re-use the demangler in the middle of
demangling a symbol while sharing back-ref state.
To make matters more complicated, there are a lot of ambiguities
when demangling a symbol's qualified name, because a function local
scope pattern (usually something like `?1??name?`) looks suspiciously
like many other possible things that can occur, such as `?1` meaning
the second back-ref and disambiguating these cases is rather
interesting. The `?1?` in a local scope pattern is actually a special
case of the more general pattern of `? + <encoded number> + ?`, where
"encoded number" can itself have embedded `@` symbols, which is a
common delimeter in mangled names. So we have to take care during the
disambiguation, which is the reason for the overly complicated
`isLocalScopePattern` function in this patch.
I've added some pretty obnoxious tests to exercise all of this, which
exposed several other problems related to back-referencing, so those
are fixed here as well. Finally, I've uncommented some tests that were
previously marked as `FIXME`, since now these work.
Differential Revision: https://reviews.llvm.org/D49965
llvm-svn: 338226
147 lines
3.7 KiB
Plaintext
147 lines
3.7 KiB
Plaintext
; RUN: llvm-undname < %s | FileCheck %s
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; CHECK-NOT: Invalid mangled name
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; Test demangling of function local scope discriminator IDs.
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?M@?@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`0'::M
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?M@?0??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`1'::M
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?M@?1??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`2'::M
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?M@?2??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`3'::M
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?M@?3??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`4'::M
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?M@?4??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`5'::M
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?M@?5??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`6'::M
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?M@?6??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`7'::M
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?M@?7??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`8'::M
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?M@?8??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`9'::M
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?M@?9??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`10'::M
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?M@?L@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`11'::M
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?M@?M@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`12'::M
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?M@?N@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`13'::M
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?M@?O@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`14'::M
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?M@?P@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`15'::M
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?M@?BA@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`16'::M
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?M@?BB@??L@@YAHXZ@4HA
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; CHECK: int `int __cdecl L(void)'::`17'::M
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?j@?1??L@@YAHXZ@4UJ@@A
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; CHECK: struct J `int __cdecl L(void)'::`2'::j
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; Test demangling of name back-references
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?NN@0XX@@3HA
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; CHECK: int XX::NN::NN
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?MM@0NN@XX@@3HA
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; CHECK: int XX::NN::MM::MM
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?NN@MM@0XX@@3HA
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; CHECK: int XX::NN::MM::NN
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?OO@0NN@01XX@@3HA
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; CHECK: int XX::NN::OO::NN::OO::OO
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?NN@OO@010XX@@3HA
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; CHECK: int XX::NN::OO::NN::OO::NN
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; Test demangling of name back-references combined with function local scopes.
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?M@?1??0@YAHXZ@4HA
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; CHECK: int `int __cdecl M(void)'::`2'::M
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?L@?2??M@0?2??0@YAHXZ@QEAAHXZ@4HA
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; CHECK: int `int __cdecl `int __cdecl L(void)'::`3'::L::M(void)'::`3'::L
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?M@?2??0L@?2??1@YAHXZ@QEAAHXZ@4HA
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; CHECK: int `int __cdecl `int __cdecl L(void)'::`3'::L::M(void)'::`3'::M
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; Function local scopes of template functions
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?M@?1???$L@H@@YAHXZ@4HA
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; CHECK: int `int __cdecl L<int>(void)'::`2'::M
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; And member functions of template classes
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?SN@?$NS@H@NS@@QEAAHXZ
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; CHECK: int __cdecl NS::NS<int>::SN(void)
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?NS@?1??SN@?$NS@H@0@QEAAHXZ@4HA
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; CHECK: int `int __cdecl NS::NS<int>::SN(void)'::`2'::NS
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?SN@?1??0?$NS@H@NS@@QEAAHXZ@4HA
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; CHECK: int `int __cdecl NS::NS<int>::SN(void)'::`2'::SN
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?NS@?1??SN@?$NS@H@10@QEAAHXZ@4HA
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; CHECK: int `int __cdecl NS::SN::NS<int>::SN(void)'::`2'::NS
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?SN@?1??0?$NS@H@0NS@@QEAAHXZ@4HA
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; CHECK: int `int __cdecl NS::SN::NS<int>::SN(void)'::`2'::SN
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; Make sure instantiated templates participate in back-referencing.
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; In the next 3 examples there should be 3 back-references:
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; 0 = X (right most name)
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; 1 = C<int> (second from right)
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; 2 = C (third from right)
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; Make sure all 3 work as expected by having the 4th component take each value
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; from 0-2 and confirming it is the right component.
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?X@?$C@H@C@0@2HB
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; CHECK: static int const X::C::C<int>::X
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?X@?$C@H@C@1@2HB
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; CHECK: static int const C<int>::C::C<int>::X
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?X@?$C@H@C@2@2HB
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; CHECK: static int const C::C::C<int>::X
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; Putting everything together.
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; namespace A { namespace B { namespace C { namespace B { namespace C {
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; template<typename T>
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; struct C {
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; int B() {
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; static C<int> C;
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; static int B = 7;
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; static int A = 7;
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; return C.B() + B + A;
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; }
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; };
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; } } } } }
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?C@?1??B@?$C@H@0101A@@QEAAHXZ@4U201013@A
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; CHECK: struct A::B::C::B::C::C<int> `int __cdecl A::B::C::B::C::C<int>::B(void)'::`2'::C
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?B@?1??0?$C@H@C@020A@@QEAAHXZ@4HA
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; CHECK: int `int __cdecl A::B::C::B::C::C<int>::B(void)'::`2'::B
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?A@?1??B@?$C@H@C@1310@QEAAHXZ@4HA
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; CHECK: int `int __cdecl A::B::C::B::C::C<int>::B(void)'::`2'::A
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