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use anyhow::{anyhow, Result};
use core::fmt::Formatter;
use cranelift_codegen::isa::CallConv;
use std::{
error,
fmt::{self, Debug, Display},
};
use target_lexicon::{Architecture, Triple};
use wasmparser::{FuncType, FuncValidator, FunctionBody, ValidatorResources};
#[cfg(feature = "x64")]
pub(crate) mod x64;
#[cfg(feature = "arm64")]
pub(crate) mod aarch64;
pub(crate) mod reg;
macro_rules! isa {
($name: ident, $cfg_terms: tt, $triple: ident) => {{
#[cfg $cfg_terms]
{
Ok(Box::new($name::isa_from($triple)))
}
#[cfg(not $cfg_terms)]
{
Err(anyhow!(LookupError::SupportDisabled))
}
}};
}
pub fn lookup(triple: Triple) -> Result<Box<dyn TargetIsa>> {
match triple.architecture {
Architecture::X86_64 => {
isa!(x64, (feature = "x64"), triple)
}
Architecture::Aarch64 { .. } => {
isa!(aarch64, (feature = "arm64"), triple)
}
_ => Err(anyhow!(LookupError::Unsupported)),
}
}
impl error::Error for LookupError {}
impl Display for LookupError {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
match self {
LookupError::Unsupported => write!(f, "This target is not supported yet"),
LookupError::SupportDisabled => write!(f, "Support for this target was disabled"),
}
}
}
#[derive(Debug)]
pub(crate) enum LookupError {
Unsupported,
#[allow(dead_code)]
SupportDisabled,
}
pub trait TargetIsa: Send + Sync {
fn name(&self) -> &'static str;
fn triple(&self) -> &Triple;
fn compile_function(
&self,
sig: &FuncType,
body: &FunctionBody,
validator: FuncValidator<ValidatorResources>,
) -> Result<Vec<String>>;
fn call_conv(&self) -> CallConv {
CallConv::triple_default(&self.triple())
}
fn endianness(&self) -> target_lexicon::Endianness {
self.triple().endianness().unwrap()
}
}
impl Debug for &dyn TargetIsa {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(
f,
"Target ISA {{ triple: {:?}, calling convention: {:?} }}",
self.triple(),
self.call_conv()
)
}
}