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Introduce a TargetFrontendConfig type. (#570)

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* Introduce a `TargetFrontendConfig` type.

`TargetFrontendConfig` is information specific to the target which is
provided to frontends to allow them to produce Cranelift IR for the
target. Currently this includes the pointer size and the default calling
convention.

The default calling convention is now inferred from the target, rather
than being a setting. cranelift-native is now just a provider of target
information, rather than also being a provider of settings, which gives
it a clearer role.

And instead of having cranelift-frontend routines require the whole
`TargetIsa`, just require the `TargetFrontendConfig`, and add a way to
get the `TargetFrontendConfig` from a `Module`.

Fixes #529.
Fixes #555.
This commit is contained in:
Dan Gohman
2018-11-02 13:51:42 -07:00
committed by GitHub
parent 7094d9f470
commit d4f8eb7453
27 changed files with 297 additions and 168 deletions
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5
lib/simplejit/src/backend.rs
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@@ -26,8 +26,9 @@ pub struct SimpleJITBuilder {
impl SimpleJITBuilder {
/// Create a new `SimpleJITBuilder`.
pub fn new() -> Self {
let (flag_builder, isa_builder) = cranelift_native::builders().unwrap_or_else(|_| {
panic!("host machine is not a supported target");
let flag_builder = settings::builder();
let isa_builder = cranelift_native::builder().unwrap_or_else(|msg| {
panic!("host machine is not supported: {}", msg);
});
let isa = isa_builder.finish(settings::Flags::new(flag_builder));
Self::with_isa(isa)