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cranelift-native crate: add API variant allowing backend selection.

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This commit is contained in:
Chris Fallin
2020-12-17 12:14:53 -08:00
parent 0b6b3d0b7a
commit 0833a92ddd
1 changed files with 20 additions and 4 deletions
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24
cranelift/native/src/lib.rs
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@@ -34,10 +34,26 @@ use raw_cpuid::CpuId;
/// machine, or `Err(())` if the host machine is not supported /// machine, or `Err(())` if the host machine is not supported
/// in the current configuration. /// in the current configuration.
pub fn builder() -> Result<isa::Builder, &'static str> { pub fn builder() -> Result<isa::Builder, &'static str> {
let mut isa_builder = isa::lookup(Triple::host()).map_err(|err| match err { builder_with_backend_variant(isa::BackendVariant::Any)
isa::LookupError::SupportDisabled => "support for architecture disabled at compile time", }
isa::LookupError::Unsupported => "unsupported architecture",
})?; /// 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_backend_variant(
variant: isa::BackendVariant,
) -> Result<isa::Builder, &'static str> {
let mut isa_builder =
isa::lookup_variant(Triple::host(), variant).map_err(|err| match err {
isa::LookupError::SupportDisabled => {
"support for architecture disabled at compile time"
}
isa::LookupError::Unsupported => "unsupported architecture",
})?;
if cfg!(any(target_arch = "x86", target_arch = "x86_64")) { if cfg!(any(target_arch = "x86", target_arch = "x86_64")) {
parse_x86_cpuid(&mut isa_builder)?; parse_x86_cpuid(&mut isa_builder)?;