d340a68ee0
The Microsoft mangle implementation does not produce back-references for
anonymous namespaces, which results in nonsensical output from both
`undname` and `llvm-undname`. Consider the following example:
```
namespace {
struct X {};
X foo(X, X);
}
int main() {
foo({}, {});
}
```
Clang 22.1.0
```
?foo@?A0xC9C482F4@@YA?AUX@?A0xC9C482F4@@U1?A0xC9C482F4@@0@Z
undname:
struct `anonymous namespace'::X __cdecl `anonymous namespace'::foo(struct `anonymous namespace'::A0xC9C482F4,struct `anonymous namespace'::A0xC9C482F4)
llvm-undname:
struct `anonymous namespace'::X __cdecl `anonymous namespace'::foo(struct `anonymous namespace'::0xC9C482F4, struct `anonymous namespace'::0xC9C482F4)
```
MSVC 19.50
```
?foo@?A0xa6a4f20e@@YA?AUX@1@U21@0@Z
undname:
struct A0xa6a4f20e::X __cdecl `anonymous namespace'::foo(struct A0xa6a4f20e::X,struct A0xa6a4f20e::X)
llvm-undname:
struct 0xa6a4f20e::X __cdecl `anonymous namespace'::foo(struct 0xa6a4f20e::X, struct 0xa6a4f20e::X)
```
As seen in the undname output for Clang's mangling, not recording a name
back-reference for the anonymous namespace when mangling results in
references to the anonymous namespace's hash in-place of the struct's
name.
When recompiling the example with the changes, Clang yields
`?foo@?A0x69FA3AC2@@YA?AUX@1@U21@0@Z`. Aside from the meaningless
discrepancy with the hash, this is identical to what is produced by
MSVC.
Resolves #37999
30 lines
1011 B
C++
30 lines
1011 B
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux -fsanitize=cfi-icall -fsanitize-trap=cfi-icall -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=ITANIUM %s
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// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc -fsanitize=cfi-icall -fsanitize-trap=cfi-icall -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=MS %s
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// Tests that we assign unnamed metadata nodes to functions whose types have
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// internal linkage.
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namespace {
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struct S {};
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void f(S s) {
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}
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}
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void g() {
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struct S s;
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void (*fp)(S) = f;
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// CHECK: call i1 @llvm.type.test(ptr {{.*}}, metadata [[VOIDS1:![0-9]+]])
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fp(s);
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}
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// ITANIUM: define internal void @_ZN12_GLOBAL__N_11fENS_1SE({{.*}} !type [[TS1:![0-9]+]] !type [[TS2:![0-9]+]]
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// MS: define internal void @"?f@?A0x{{[^@]*}}@@YAXUS@1@@Z"({{.*}} !type [[TS1:![0-9]+]] !type [[TS2:![0-9]+]]
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// CHECK: [[VOIDS1]] = distinct !{}
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// CHECK: [[TS1]] = !{i64 0, [[VOIDS1]]}
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// CHECK: [[TS2]] = !{i64 0, [[VOIDS2:![0-9]+]]}
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// CHECK: [[VOIDS2]] = distinct !{}
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