From 4547b622d8d29df964fa2914213088b148c498fc Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:18:32 +0200 Subject: Merging upstream version 1.67.1+dfsg1. Signed-off-by: Daniel Baumann --- compiler/rustc_target/src/spec/abi.rs | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'compiler/rustc_target/src/spec/abi.rs') diff --git a/compiler/rustc_target/src/spec/abi.rs b/compiler/rustc_target/src/spec/abi.rs index ce45fa139..cb2a0c04c 100644 --- a/compiler/rustc_target/src/spec/abi.rs +++ b/compiler/rustc_target/src/spec/abi.rs @@ -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, -- cgit v1.2.3