97 lines
3.5 KiB
Rust
97 lines
3.5 KiB
Rust
use crate::isa::TargetIsa;
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use crate::settings::LibcallCallConv;
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use core::fmt;
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use core::str;
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use target_lexicon::{CallingConvention, Triple};
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/// Calling convention identifiers.
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub enum CallConv {
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/// Best performance, not ABI-stable
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Fast,
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/// Smallest caller code size, not ABI-stable
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Cold,
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/// System V-style convention used on many platforms
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SystemV,
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/// Windows "fastcall" convention, also used for x64 and ARM
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WindowsFastcall,
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/// SpiderMonkey WebAssembly convention on systems using natively SystemV
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BaldrdashSystemV,
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/// SpiderMonkey WebAssembly convention on Windows
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BaldrdashWindows,
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/// Specialized convention for the probestack function
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Probestack,
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}
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impl CallConv {
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/// Return the default calling convention for the given target triple.
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pub fn triple_default(triple: &Triple) -> Self {
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match triple.default_calling_convention() {
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// Default to System V for unknown targets because most everything
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// uses System V.
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Ok(CallingConvention::SystemV) | Err(()) => CallConv::SystemV,
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Ok(CallingConvention::WindowsFastcall) => CallConv::WindowsFastcall,
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}
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}
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/// Returns the calling convention used for libcalls for the given ISA.
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pub fn for_libcall(isa: &dyn TargetIsa) -> Self {
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match isa.flags().libcall_call_conv() {
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LibcallCallConv::IsaDefault => isa.default_call_conv(),
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LibcallCallConv::Fast => CallConv::Fast,
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LibcallCallConv::Cold => CallConv::Cold,
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LibcallCallConv::SystemV => CallConv::SystemV,
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LibcallCallConv::WindowsFastcall => CallConv::WindowsFastcall,
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LibcallCallConv::BaldrdashSystemV => CallConv::BaldrdashSystemV,
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LibcallCallConv::BaldrdashWindows => CallConv::BaldrdashWindows,
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LibcallCallConv::Probestack => CallConv::Probestack,
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}
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}
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/// Is the calling convention extending the Windows Fastcall ABI?
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pub fn extends_windows_fastcall(&self) -> bool {
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match self {
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CallConv::WindowsFastcall | CallConv::BaldrdashWindows => true,
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_ => false,
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}
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}
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/// Is the calling convention extending the Baldrdash ABI?
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pub fn extends_baldrdash(&self) -> bool {
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match self {
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CallConv::BaldrdashSystemV | CallConv::BaldrdashWindows => true,
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_ => false,
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}
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}
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}
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impl fmt::Display for CallConv {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.write_str(match *self {
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CallConv::Fast => "fast",
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CallConv::Cold => "cold",
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CallConv::SystemV => "system_v",
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CallConv::WindowsFastcall => "windows_fastcall",
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CallConv::BaldrdashSystemV => "baldrdash_system_v",
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CallConv::BaldrdashWindows => "baldrdash_windows",
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CallConv::Probestack => "probestack",
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})
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}
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}
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impl str::FromStr for CallConv {
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type Err = ();
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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match s {
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"fast" => Ok(CallConv::Fast),
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"cold" => Ok(CallConv::Cold),
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"system_v" => Ok(CallConv::SystemV),
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"windows_fastcall" => Ok(CallConv::WindowsFastcall),
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"baldrdash_system_v" => Ok(CallConv::BaldrdashSystemV),
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"baldrdash_windows" => Ok(CallConv::BaldrdashWindows),
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"probestack" => Ok(CallConv::Probestack),
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_ => Err(()),
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}
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}
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}
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