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|
use rustc_abi::{ArmCall, CanonAbi, ExternAbi, InterruptKind, X86Call};
use crate::spec::Target;
/// Mapping for ExternAbi to CanonAbi according to a Target
///
/// A maybe-transitional structure circa 2025 for hosting future experiments in
/// encapsulating arch-specific ABI lowering details to make them more testable.
#[derive(Clone, Debug)]
pub struct AbiMap {
arch: Arch,
os: OsKind,
}
/// result from trying to map an ABI
#[derive(Copy, Clone, Debug)]
pub enum AbiMapping {
/// this ABI is exactly mapped for this platform
Direct(CanonAbi),
/// we don't yet warn on this, but we will
Deprecated(CanonAbi),
/// ABI we do not map for this platform: it must not reach codegen
Invalid,
}
impl AbiMapping {
/// optionally get a [CanonAbi], even if Deprecated
pub fn into_option(self) -> Option<CanonAbi> {
match self {
Self::Direct(abi) | Self::Deprecated(abi) => Some(abi),
Self::Invalid => None,
}
}
/// get a [CanonAbi] even if Deprecated, panicking if Invalid
#[track_caller]
pub fn unwrap(self) -> CanonAbi {
self.into_option().unwrap()
}
pub fn is_mapped(self) -> bool {
self.into_option().is_some()
}
}
impl AbiMap {
/// create an AbiMap according to arbitrary fields on the [Target]
pub fn from_target(target: &Target) -> Self {
// the purpose of this little exercise is to force listing what affects these mappings
let arch = match &*target.arch {
"aarch64" => Arch::Aarch64,
"amdgpu" => Arch::Amdgpu,
"arm" if target.llvm_target.starts_with("thumbv8m") => Arch::Arm(ArmVer::ThumbV8M),
"arm" => Arch::Arm(ArmVer::Other),
"avr" => Arch::Avr,
"msp430" => Arch::Msp430,
"nvptx64" => Arch::Nvptx,
"riscv32" | "riscv64" => Arch::Riscv,
"x86" => Arch::X86,
"x86_64" => Arch::X86_64,
_ => Arch::Other,
};
let os = if target.is_like_windows { OsKind::Windows } else { OsKind::Other };
AbiMap { arch, os }
}
/// lower an [ExternAbi] to a [CanonAbi] if this AbiMap allows
pub fn canonize_abi(&self, extern_abi: ExternAbi, has_c_varargs: bool) -> AbiMapping {
let AbiMap { os, arch } = *self;
let canon_abi = match (extern_abi, arch) {
// infallible lowerings
(ExternAbi::C { .. }, _) => CanonAbi::C,
(ExternAbi::Rust | ExternAbi::RustCall, _) => CanonAbi::Rust,
(ExternAbi::Unadjusted, _) => CanonAbi::C,
(ExternAbi::RustCold, _) if self.os == OsKind::Windows => CanonAbi::Rust,
(ExternAbi::RustCold, _) => CanonAbi::RustCold,
(ExternAbi::Custom, _) => CanonAbi::Custom,
(ExternAbi::System { .. }, Arch::X86) if os == OsKind::Windows && !has_c_varargs => {
CanonAbi::X86(X86Call::Stdcall)
}
(ExternAbi::System { .. }, _) => CanonAbi::C,
// fallible lowerings
(ExternAbi::EfiApi, Arch::Arm(..)) => CanonAbi::Arm(ArmCall::Aapcs),
(ExternAbi::EfiApi, Arch::X86_64) => CanonAbi::X86(X86Call::Win64),
(ExternAbi::EfiApi, Arch::Aarch64 | Arch::Riscv | Arch::X86) => CanonAbi::C,
(ExternAbi::EfiApi, _) => return AbiMapping::Invalid,
(ExternAbi::Aapcs { .. }, Arch::Arm(..)) => CanonAbi::Arm(ArmCall::Aapcs),
(ExternAbi::Aapcs { .. }, _) => return AbiMapping::Invalid,
(ExternAbi::CCmseNonSecureCall, Arch::Arm(ArmVer::ThumbV8M)) => {
CanonAbi::Arm(ArmCall::CCmseNonSecureCall)
}
(ExternAbi::CCmseNonSecureEntry, Arch::Arm(ArmVer::ThumbV8M)) => {
CanonAbi::Arm(ArmCall::CCmseNonSecureEntry)
}
(ExternAbi::CCmseNonSecureCall | ExternAbi::CCmseNonSecureEntry, ..) => {
return AbiMapping::Invalid;
}
(ExternAbi::Cdecl { .. }, Arch::X86) => CanonAbi::C,
(ExternAbi::Cdecl { .. }, _) => return AbiMapping::Deprecated(CanonAbi::C),
(ExternAbi::Fastcall { .. }, Arch::X86) => CanonAbi::X86(X86Call::Fastcall),
(ExternAbi::Fastcall { .. }, _) if os == OsKind::Windows => {
return AbiMapping::Deprecated(CanonAbi::C);
}
(ExternAbi::Fastcall { .. }, _) => return AbiMapping::Invalid,
(ExternAbi::Stdcall { .. }, Arch::X86) => CanonAbi::X86(X86Call::Stdcall),
(ExternAbi::Stdcall { .. }, _) if os == OsKind::Windows => {
return AbiMapping::Deprecated(CanonAbi::C);
}
(ExternAbi::Stdcall { .. }, _) => return AbiMapping::Invalid,
(ExternAbi::Thiscall { .. }, Arch::X86) => CanonAbi::X86(X86Call::Thiscall),
(ExternAbi::Thiscall { .. }, _) => return AbiMapping::Invalid,
(ExternAbi::Vectorcall { .. }, Arch::X86 | Arch::X86_64) => {
CanonAbi::X86(X86Call::Vectorcall)
}
(ExternAbi::Vectorcall { .. }, _) => return AbiMapping::Invalid,
(ExternAbi::SysV64 { .. }, Arch::X86_64) => CanonAbi::X86(X86Call::SysV64),
(ExternAbi::Win64 { .. }, Arch::X86_64) => CanonAbi::X86(X86Call::Win64),
(ExternAbi::SysV64 { .. } | ExternAbi::Win64 { .. }, _) => return AbiMapping::Invalid,
(ExternAbi::PtxKernel, Arch::Nvptx) => CanonAbi::GpuKernel,
(ExternAbi::GpuKernel, Arch::Amdgpu | Arch::Nvptx) => CanonAbi::GpuKernel,
(ExternAbi::PtxKernel | ExternAbi::GpuKernel, _) => return AbiMapping::Invalid,
(ExternAbi::AvrInterrupt, Arch::Avr) => CanonAbi::Interrupt(InterruptKind::Avr),
(ExternAbi::AvrNonBlockingInterrupt, Arch::Avr) => {
CanonAbi::Interrupt(InterruptKind::AvrNonBlocking)
}
(ExternAbi::Msp430Interrupt, Arch::Msp430) => {
CanonAbi::Interrupt(InterruptKind::Msp430)
}
(ExternAbi::RiscvInterruptM, Arch::Riscv) => {
CanonAbi::Interrupt(InterruptKind::RiscvMachine)
}
(ExternAbi::RiscvInterruptS, Arch::Riscv) => {
CanonAbi::Interrupt(InterruptKind::RiscvSupervisor)
}
(ExternAbi::X86Interrupt, Arch::X86 | Arch::X86_64) => {
CanonAbi::Interrupt(InterruptKind::X86)
}
(
ExternAbi::AvrInterrupt
| ExternAbi::AvrNonBlockingInterrupt
| ExternAbi::Msp430Interrupt
| ExternAbi::RiscvInterruptM
| ExternAbi::RiscvInterruptS
| ExternAbi::X86Interrupt,
_,
) => return AbiMapping::Invalid,
};
AbiMapping::Direct(canon_abi)
}
}
#[derive(Debug, PartialEq, Copy, Clone)]
enum Arch {
Aarch64,
Amdgpu,
Arm(ArmVer),
Avr,
Msp430,
Nvptx,
Riscv,
X86,
X86_64,
/// Architectures which don't need other considerations for ABI lowering
Other,
}
#[derive(Debug, PartialEq, Copy, Clone)]
enum OsKind {
Windows,
Other,
}
#[derive(Debug, PartialEq, Copy, Clone)]
enum ArmVer {
ThumbV8M,
Other,
}
|
