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adjust_abi: make fallback logic for ABIs a bit easier to read

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This commit is contained in:
Ralf Jung 2025-02-21 12:19:21 +01:00
parent a18bd8acfc
commit f7ae9e11fc
1 changed files with 26 additions and 11 deletions
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37
compiler/rustc_target/src/spec/mod.rs
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@ -2862,20 +2862,35 @@ impl Target {
// On Windows, `extern "system"` behaves like msvc's `__stdcall`.
// `__stdcall` only applies on x86 and on non-variadic functions:
// https://learn.microsoft.com/en-us/cpp/cpp/stdcall?view=msvc-170
System { unwind } if self.is_like_windows && self.arch == "x86" && !c_variadic => {
Stdcall { unwind }
System { unwind } => {
if self.is_like_windows && self.arch == "x86" && !c_variadic {
Stdcall { unwind }
} else {
C { unwind }
}
}
EfiApi => {
if self.arch == "arm" {
Aapcs { unwind: false }
} else if self.arch == "x86_64" {
Win64 { unwind: false }
} else {
C { unwind: false }
}
}
System { unwind } => C { unwind },
EfiApi if self.arch == "arm" => Aapcs { unwind: false },
EfiApi if self.arch == "x86_64" => Win64 { unwind: false },
EfiApi => C { unwind: false },
// See commentary in `is_abi_supported`.
Stdcall { .. } | Thiscall { .. } if self.arch == "x86" => abi,
Stdcall { unwind } | Thiscall { unwind } => C { unwind },
Fastcall { .. } if self.arch == "x86" => abi,
Vectorcall { .. } if ["x86", "x86_64"].contains(&&self.arch[..]) => abi,
Fastcall { unwind } | Vectorcall { unwind } => C { unwind },
Stdcall { unwind } | Thiscall { unwind } | Fastcall { unwind } => {
if self.arch == "x86" { abi } else { C { unwind } }
}
Vectorcall { unwind } => {
if ["x86", "x86_64"].contains(&&*self.arch) {
abi
} else {
C { unwind }
}
}
// The Windows x64 calling convention we use for `extern "Rust"`
// <https://learn.microsoft.com/en-us/cpp/build/x64-software-conventions#register-volatility-and-preservation>