Trait CodegenBackend

pub trait CodegenBackend {
    // Required methods
    fn locale_resource(&self) -> &'static str;
    fn codegen_crate<'tcx>(
        &self,
        tcx: TyCtxt<'tcx>,
        metadata: EncodedMetadata,
        need_metadata_module: bool,
    ) -> Box<dyn Any>;
    fn join_codegen(
        &self,
        ongoing_codegen: Box<dyn Any>,
        sess: &Session,
        outputs: &OutputFilenames,
    ) -> (CodegenResults, FxIndexMap<WorkProductId, WorkProduct>);

    // Provided methods
    fn init(&self, _sess: &Session) { ... }
    fn print(&self, _req: &PrintRequest, _out: &mut String, _sess: &Session) { ... }
    fn target_features_cfg(
        &self,
        _sess: &Session,
        _allow_unstable: bool,
    ) -> Vec<Symbol> { ... }
    fn print_passes(&self) { ... }
    fn print_version(&self) { ... }
    fn metadata_loader(&self) -> Box<MetadataLoaderDyn> { ... }
    fn provide(&self, _providers: &mut Providers) { ... }
    fn link(
        &self,
        sess: &Session,
        codegen_results: CodegenResults,
        outputs: &OutputFilenames,
    ) { ... }
    fn supports_parallel(&self) -> bool { ... }
}

Required Methods

fn locale_resource(&self) -> &'static str

Locale resources for diagnostic messages - a string the content of the Fluent resource. Called before init so that all other functions are able to emit translatable diagnostics.

fn codegen_crate<'tcx>( &self, tcx: TyCtxt<'tcx>, metadata: EncodedMetadata, need_metadata_module: bool, ) -> Box<dyn Any>

fn join_codegen( &self, ongoing_codegen: Box<dyn Any>, sess: &Session, outputs: &OutputFilenames, ) -> (CodegenResults, FxIndexMap<WorkProductId, WorkProduct>)

This is called on the returned Box<dyn Any> from codegen_crate

Panics

Panics when the passed Box<dyn Any> was not returned by codegen_crate.

Provided Methods

fn init(&self, _sess: &Session)

fn print(&self, _req: &PrintRequest, _out: &mut String, _sess: &Session)

fn target_features_cfg( &self, _sess: &Session, _allow_unstable: bool, ) -> Vec<Symbol>

Returns the features that should be set in cfg(target_features). RUSTC_SPECIFIC_FEATURES should be skipped here, those are handled outside codegen.

fn print_passes(&self)

fn print_version(&self)

fn metadata_loader(&self) -> Box<MetadataLoaderDyn>

The metadata loader used to load rlib and dylib metadata.

Alternative codegen backends may want to use different rlib or dylib formats than the default native static archives and dynamic libraries.

fn provide(&self, _providers: &mut Providers)

fn link( &self, sess: &Session, codegen_results: CodegenResults, outputs: &OutputFilenames, )

This is called on the returned CodegenResults from join_codegen.

fn supports_parallel(&self) -> bool

Returns true if this backend can be safely called from multiple threads.

Defaults to true.

Implementors