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#![feature(rustc_private)]
extern crate rustc_codegen_ssa;
extern crate rustc_errors;
extern crate rustc_middle;
#[macro_use]
extern crate rustc_data_structures;
extern crate rustc_driver;
extern crate rustc_hir;
extern crate rustc_session;
extern crate rustc_span;
extern crate rustc_symbol_mangling;
extern crate rustc_target;
use rustc_codegen_ssa::traits::CodegenBackend;
use rustc_data_structures::owning_ref::OwningRef;
use rustc_data_structures::sync::MetadataRef;
use rustc_errors::ErrorReported;
use rustc_middle::dep_graph::DepGraph;
use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader, MetadataLoaderDyn};
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::TyCtxt;
use rustc_session::config::OutputFilenames;
use rustc_session::Session;
use rustc_span::symbol::Symbol;
use rustc_target::spec::Target;
use std::any::Any;
use std::path::Path;
pub struct NoLlvmMetadataLoader;
impl MetadataLoader for NoLlvmMetadataLoader {
fn get_rlib_metadata(&self, _: &Target, filename: &Path) -> Result<MetadataRef, String> {
let buf =
std::fs::read(filename).map_err(|e| format!("metadata file open err: {:?}", e))?;
let buf: OwningRef<Vec<u8>, [u8]> = OwningRef::new(buf);
Ok(rustc_erase_owner!(buf.map_owner_box()))
}
fn get_dylib_metadata(&self, target: &Target, filename: &Path) -> Result<MetadataRef, String> {
self.get_rlib_metadata(target, filename)
}
}
struct TheBackend;
impl CodegenBackend for TheBackend {
fn metadata_loader(&self) -> Box<MetadataLoaderDyn> {
Box::new(NoLlvmMetadataLoader)
}
fn provide(&self, providers: &mut Providers) {
rustc_symbol_mangling::provide(providers);
providers.supported_target_features = |tcx, _cnum| {
Default::default() // Just a dummy
};
providers.is_reachable_non_generic = |_tcx, _defid| true;
providers.exported_symbols = |_tcx, _crate| &[];
}
fn provide_extern(&self, providers: &mut Providers) {
providers.is_reachable_non_generic = |_tcx, _defid| true;
}
fn codegen_crate<'a, 'tcx>(
&self,
tcx: TyCtxt<'tcx>,
_metadata: EncodedMetadata,
_need_metadata_module: bool,
) -> Box<dyn Any> {
use rustc_hir::def_id::LOCAL_CRATE;
Box::new(tcx.crate_name(LOCAL_CRATE) as Symbol)
}
fn join_codegen(
&self,
ongoing_codegen: Box<dyn Any>,
_sess: &Session,
_dep_graph: &DepGraph,
) -> Result<Box<dyn Any>, ErrorReported> {
let crate_name = ongoing_codegen
.downcast::<Symbol>()
.expect("in join_codegen: ongoing_codegen is not a Symbol");
Ok(crate_name)
}
fn link(
&self,
sess: &Session,
codegen_results: Box<dyn Any>,
outputs: &OutputFilenames,
) -> Result<(), ErrorReported> {
use rustc_session::{config::CrateType, output::out_filename};
use std::io::Write;
let crate_name =
codegen_results.downcast::<Symbol>().expect("in link: codegen_results is not a Symbol");
for &crate_type in sess.opts.crate_types.iter() {
if crate_type != CrateType::Rlib {
sess.fatal(&format!("Crate type is {:?}", crate_type));
}
let output_name = out_filename(sess, crate_type, &outputs, &*crate_name.as_str());
let mut out_file = ::std::fs::File::create(output_name).unwrap();
write!(out_file, "This has been \"compiled\" successfully.").unwrap();
}
Ok(())
}
}
/// This is the entrypoint for a hot plugged rustc_codegen_llvm
#[no_mangle]
pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
Box::new(TheBackend)
}
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