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rust/src/cranelift_native.rs
bjorn3 ff56716d03 Fix CI
2023-01-25 16:27:28 +01:00

249 lines
9.1 KiB
Rust
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// Vendored from https://github.com/bytecodealliance/wasmtime/blob/b58a197d33f044193c3d608010f5e6ec394ac07e/cranelift/native/src/lib.rs
// which is licensed as
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// unlike rustc_codegen_cranelift itself. Also applies a small change to remove #![cfg_attr] that
// rust's CI complains about and to fix formatting to match rustc.
// FIXME revert back to the external crate with Cranelift 0.93
#![allow(warnings)]
//! Performs autodetection of the host for the purposes of running
//! Cranelift to generate code to run on the same machine.
#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates, unstable_features)]
#![warn(unused_import_braces)]
use cranelift_codegen::isa;
use target_lexicon::Triple;
/// Return an `isa` builder configured for the current host
/// machine, or `Err(())` if the host machine is not supported
/// in the current configuration.
pub fn builder() -> Result<isa::Builder, &'static str> {
builder_with_options(true)
}
/// Return an `isa` builder configured for the current host
/// machine, or `Err(())` if the host machine is not supported
/// in the current configuration.
///
/// Selects the given backend variant specifically; this is
/// useful when more than oen backend exists for a given target
/// (e.g., on x86-64).
pub fn builder_with_options(infer_native_flags: bool) -> Result<isa::Builder, &'static str> {
let mut isa_builder = isa::lookup(Triple::host()).map_err(|err| match err {
isa::LookupError::SupportDisabled => "support for architecture disabled at compile time",
isa::LookupError::Unsupported => "unsupported architecture",
})?;
#[cfg(target_arch = "x86_64")]
{
use cranelift_codegen::settings::Configurable;
if !std::is_x86_feature_detected!("sse2") {
return Err("x86 support requires SSE2");
}
if !infer_native_flags {
return Ok(isa_builder);
}
// These are temporarily enabled by default (see #3810 for
// more) so that a default-constructed `Flags` can work with
// default Wasmtime features. Otherwise, the user must
// explicitly use native flags or turn these on when on x86-64
// platforms to avoid a configuration panic. In order for the
// "enable if detected" logic below to work, we must turn them
// *off* (differing from the default) and then re-enable below
// if present.
isa_builder.set("has_sse3", "false").unwrap();
isa_builder.set("has_ssse3", "false").unwrap();
isa_builder.set("has_sse41", "false").unwrap();
isa_builder.set("has_sse42", "false").unwrap();
if std::is_x86_feature_detected!("sse3") {
isa_builder.enable("has_sse3").unwrap();
}
if std::is_x86_feature_detected!("ssse3") {
isa_builder.enable("has_ssse3").unwrap();
}
if std::is_x86_feature_detected!("sse4.1") {
isa_builder.enable("has_sse41").unwrap();
}
if std::is_x86_feature_detected!("sse4.2") {
isa_builder.enable("has_sse42").unwrap();
}
if std::is_x86_feature_detected!("popcnt") {
isa_builder.enable("has_popcnt").unwrap();
}
if std::is_x86_feature_detected!("avx") {
isa_builder.enable("has_avx").unwrap();
}
if std::is_x86_feature_detected!("avx2") {
isa_builder.enable("has_avx2").unwrap();
}
if std::is_x86_feature_detected!("fma") {
isa_builder.enable("has_fma").unwrap();
}
if std::is_x86_feature_detected!("bmi1") {
isa_builder.enable("has_bmi1").unwrap();
}
if std::is_x86_feature_detected!("bmi2") {
isa_builder.enable("has_bmi2").unwrap();
}
if std::is_x86_feature_detected!("avx512bitalg") {
isa_builder.enable("has_avx512bitalg").unwrap();
}
if std::is_x86_feature_detected!("avx512dq") {
isa_builder.enable("has_avx512dq").unwrap();
}
if std::is_x86_feature_detected!("avx512f") {
isa_builder.enable("has_avx512f").unwrap();
}
if std::is_x86_feature_detected!("avx512vl") {
isa_builder.enable("has_avx512vl").unwrap();
}
if std::is_x86_feature_detected!("avx512vbmi") {
isa_builder.enable("has_avx512vbmi").unwrap();
}
if std::is_x86_feature_detected!("lzcnt") {
isa_builder.enable("has_lzcnt").unwrap();
}
}
#[cfg(target_arch = "aarch64")]
{
use cranelift_codegen::settings::Configurable;
if !infer_native_flags {
return Ok(isa_builder);
}
if std::arch::is_aarch64_feature_detected!("lse") {
isa_builder.enable("has_lse").unwrap();
}
if std::arch::is_aarch64_feature_detected!("paca") {
isa_builder.enable("has_pauth").unwrap();
}
if cfg!(target_os = "macos") {
// Pointer authentication is always available on Apple Silicon.
isa_builder.enable("sign_return_address").unwrap();
// macOS enforces the use of the B key for return addresses.
isa_builder.enable("sign_return_address_with_bkey").unwrap();
}
}
// There is no is_s390x_feature_detected macro yet, so for now
// we use getauxval from the libc crate directly.
#[cfg(all(target_arch = "s390x", target_os = "linux"))]
{
use cranelift_codegen::settings::Configurable;
if !infer_native_flags {
return Ok(isa_builder);
}
let v = unsafe { libc::getauxval(libc::AT_HWCAP) };
const HWCAP_S390X_VXRS_EXT2: libc::c_ulong = 32768;
if (v & HWCAP_S390X_VXRS_EXT2) != 0 {
isa_builder.enable("has_vxrs_ext2").unwrap();
// There is no separate HWCAP bit for mie2, so assume
// that any machine with vxrs_ext2 also has mie2.
isa_builder.enable("has_mie2").unwrap();
}
}
// `is_riscv_feature_detected` is nightly only for now, use
// getauxval from the libc crate directly as a temporary measure.
#[cfg(all(target_arch = "riscv64", target_os = "linux"))]
{
use cranelift_codegen::settings::Configurable;
if !infer_native_flags {
return Ok(isa_builder);
}
let v = unsafe { libc::getauxval(libc::AT_HWCAP) };
const HWCAP_RISCV_EXT_A: libc::c_ulong = 1 << (b'a' - b'a');
const HWCAP_RISCV_EXT_C: libc::c_ulong = 1 << (b'c' - b'a');
const HWCAP_RISCV_EXT_D: libc::c_ulong = 1 << (b'd' - b'a');
const HWCAP_RISCV_EXT_F: libc::c_ulong = 1 << (b'f' - b'a');
const HWCAP_RISCV_EXT_M: libc::c_ulong = 1 << (b'm' - b'a');
const HWCAP_RISCV_EXT_V: libc::c_ulong = 1 << (b'v' - b'a');
if (v & HWCAP_RISCV_EXT_A) != 0 {
isa_builder.enable("has_a").unwrap();
}
if (v & HWCAP_RISCV_EXT_C) != 0 {
isa_builder.enable("has_c").unwrap();
}
if (v & HWCAP_RISCV_EXT_D) != 0 {
isa_builder.enable("has_d").unwrap();
}
if (v & HWCAP_RISCV_EXT_F) != 0 {
isa_builder.enable("has_f").unwrap();
// TODO: There doesn't seem to be a bit associated with this extension
// rust enables it with the `f` extension:
// https://github.com/rust-lang/stdarch/blob/790411f93c4b5eada3c23abb4c9a063fb0b24d99/crates/std_detect/src/detect/os/linux/riscv.rs#L43
isa_builder.enable("has_zicsr").unwrap();
}
if (v & HWCAP_RISCV_EXT_M) != 0 {
isa_builder.enable("has_m").unwrap();
}
if (v & HWCAP_RISCV_EXT_V) != 0 {
isa_builder.enable("has_v").unwrap();
}
// TODO: ZiFencei does not have a bit associated with it
// TODO: Zbkb does not have a bit associated with it
}
// squelch warnings about unused mut/variables on some platforms.
drop(&mut isa_builder);
drop(infer_native_flags);
Ok(isa_builder)
}
#[cfg(test)]
mod tests {
use super::builder;
use cranelift_codegen::isa::CallConv;
use cranelift_codegen::settings;
#[test]
fn test() {
if let Ok(isa_builder) = builder() {
let flag_builder = settings::builder();
let isa = isa_builder.finish(settings::Flags::new(flag_builder)).unwrap();
if cfg!(all(target_os = "macos", target_arch = "aarch64")) {
assert_eq!(isa.default_call_conv(), CallConv::AppleAarch64);
} else if cfg!(any(unix, target_os = "nebulet")) {
assert_eq!(isa.default_call_conv(), CallConv::SystemV);
} else if cfg!(windows) {
assert_eq!(isa.default_call_conv(), CallConv::WindowsFastcall);
}
if cfg!(target_pointer_width = "64") {
assert_eq!(isa.pointer_bits(), 64);
} else if cfg!(target_pointer_width = "32") {
assert_eq!(isa.pointer_bits(), 32);
} else if cfg!(target_pointer_width = "16") {
assert_eq!(isa.pointer_bits(), 16);
}
}
}
}
/// Version number of this crate.
pub const VERSION: &str = env!("CARGO_PKG_VERSION");
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