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//! The Rust compiler.
//!
//! # Note
//!
//! This API is completely unstable and subject to change.
#![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
use std::any::Any;
use syntax::symbol::Symbol;
use rustc::session::Session;
use rustc::util::common::ErrorReported;
use rustc::session::config::{OutputFilenames, PrintRequest};
use rustc::ty::TyCtxt;
use rustc::ty::query::Providers;
use rustc::middle::cstore::{EncodedMetadata, MetadataLoader};
use rustc::dep_graph::DepGraph;
pub use rustc_data_structures::sync::MetadataRef;
pub trait CodegenBackend {
fn init(&self, _sess: &Session) {}
fn print(&self, _req: PrintRequest, _sess: &Session) {}
fn target_features(&self, _sess: &Session) -> Vec<Symbol> { vec![] }
fn print_passes(&self) {}
fn print_version(&self) {}
fn diagnostics(&self) -> &[(&'static str, &'static str)] { &[] }
fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync>;
fn provide(&self, _providers: &mut Providers<'_>);
fn provide_extern(&self, _providers: &mut Providers<'_>);
fn codegen_crate<'tcx>(
&self,
tcx: TyCtxt<'tcx>,
metadata: EncodedMetadata,
need_metadata_module: bool,
) -> Box<dyn Any>;
/// This is called on the returned `Box<dyn Any>` from `codegen_backend`
///
/// # Panics
///
/// Panics when the passed `Box<dyn Any>` was not returned by `codegen_backend`.
fn join_codegen_and_link(
&self,
ongoing_codegen: Box<dyn Any>,
sess: &Session,
dep_graph: &DepGraph,
outputs: &OutputFilenames,
) -> Result<(), ErrorReported>;
}
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