| commit | d4cb5d9f2ba636b0049fc5791d378e224e3a3ae7 | [log] [tgz] |
|---|---|---|
| author | Fangrui Song <i@maskray.me> | Tue Jan 16 23:57:42 2024 -0800 |
| committer | GitHub <noreply@github.com> | Tue Jan 16 23:57:42 2024 -0800 |
| tree | 6a7d460575e891e526c5562f33594489d0468847 | |
| parent | 2b3cdd69f7fa8f84513390fff06d0a9c28126717 [diff] |
[X86] Add "Ws" constraint and "p" modifier for symbolic address/label reference (#77886)
Printing the raw symbol is useful in inline asm (e.g. getting the C++
mangled name, referencing a symbol in a custom way while ensuring it is
not optimized out even if internal). Similar constraints are available
in other targets (e.g. "S" for aarch64/riscv, "Cs" for m68k).
```
namespace ns { extern int var, a[4]; }
void foo() {
asm(".pushsection .xxx,\"aw\"; .dc.a %p0; .popsection" :: "Ws"(&ns::var));
asm(".reloc ., BFD_RELOC_NONE, %p0" :: "Ws"(&ns::a[3]));
}
```
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105576
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