bjoernager/rust
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Enable varargs support for calling conventions other than C or cdecl

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This patch makes it possible to use varargs for calling conventions,
which are either based on C (like efiapi) or C is based
on them (for example sysv64 and win64).
This commit is contained in:
Soveu 2022-08-08 15:31:32 +02:00 • committed by Jack Huey
parent 7fcf850d79
commit ba847cad6d
12 changed files with 174 additions and 35 deletions
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22
compiler/rustc_target/src/spec/abi.rs
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@ -40,6 +40,28 @@ pub enum Abi {
RustCold,
}
impl Abi {
pub fn supports_varargs(self) -> bool {
// * C and Cdecl obviously support varargs.
// * C can be based on SysV64 or Win64, so they must support varargs.
// * EfiApi is based on Win64 or C, so it also supports it.
//
// * Stdcall does not, because it would be impossible for the callee to clean
// up the arguments. (callee doesn't know how many arguments are there)
// * Same for Fastcall, Vectorcall and Thiscall.
// * System can become Stdcall, so is also a no-no.
// * Other calling conventions are related to hardware or the compiler itself.
match self {
Self::C { .. }
| Self::Cdecl { .. }
| Self::Win64 { .. }
| Self::SysV64 { .. }
| Self::EfiApi => true,
_ => false,
}
}
}
#[derive(Copy, Clone)]
pub struct AbiData {
abi: Abi,