mv compiler to compiler/

compiler/rustc_codegen_ssa/src/traits/backend.rs

@@ -0,0 +1,119 @@
+use super::write::WriteBackendMethods;
+use super::CodegenObject;
+use crate::ModuleCodegen;
+
+use rustc_ast::expand::allocator::AllocatorKind;
+use rustc_errors::ErrorReported;
+use rustc_middle::dep_graph::DepGraph;
+use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
+use rustc_middle::ty::layout::{HasTyCtxt, TyAndLayout};
+use rustc_middle::ty::query::Providers;
+use rustc_middle::ty::{Ty, TyCtxt};
+use rustc_session::{
+    config::{self, OutputFilenames, PrintRequest},
+    Session,
+};
+use rustc_span::symbol::Symbol;
+use rustc_target::abi::LayoutOf;
+
+pub use rustc_data_structures::sync::MetadataRef;
+
+use std::any::Any;
+use std::sync::Arc;
+
+pub trait BackendTypes {
+    type Value: CodegenObject;
+    type Function: CodegenObject;
+
+    type BasicBlock: Copy;
+    type Type: CodegenObject;
+    type Funclet;
+
+    // FIXME(eddyb) find a common convention for all of the debuginfo-related
+    // names (choose between `Dbg`, `Debug`, `DebugInfo`, `DI` etc.).
+    type DIScope: Copy;
+    type DIVariable: Copy;
+}
+
+pub trait Backend<'tcx>:
+    Sized + BackendTypes + HasTyCtxt<'tcx> + LayoutOf<Ty = Ty<'tcx>, TyAndLayout = TyAndLayout<'tcx>>
+{
+}
+
+impl<'tcx, T> Backend<'tcx> for T where
+    Self: BackendTypes + HasTyCtxt<'tcx> + LayoutOf<Ty = Ty<'tcx>, TyAndLayout = TyAndLayout<'tcx>>
+{
+}
+
+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 metadata_loader(&self) -> Box<MetadataLoaderDyn>;
+    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(
+        &self,
+        ongoing_codegen: Box<dyn Any>,
+        sess: &Session,
+        dep_graph: &DepGraph,
+    ) -> Result<Box<dyn Any>, ErrorReported>;
+
+    /// This is called on the returned `Box<dyn Any>` from `join_codegen`
+    ///
+    /// # Panics
+    ///
+    /// Panics when the passed `Box<dyn Any>` was not returned by `join_codegen`.
+    fn link(
+        &self,
+        sess: &Session,
+        codegen_results: Box<dyn Any>,
+        outputs: &OutputFilenames,
+    ) -> Result<(), ErrorReported>;
+}
+
+pub trait ExtraBackendMethods: CodegenBackend + WriteBackendMethods + Sized + Send + Sync {
+    fn new_metadata(&self, sess: TyCtxt<'_>, mod_name: &str) -> Self::Module;
+    fn write_compressed_metadata<'tcx>(
+        &self,
+        tcx: TyCtxt<'tcx>,
+        metadata: &EncodedMetadata,
+        llvm_module: &mut Self::Module,
+    );
+    fn codegen_allocator<'tcx>(
+        &self,
+        tcx: TyCtxt<'tcx>,
+        mods: &mut Self::Module,
+        kind: AllocatorKind,
+    );
+    /// This generates the codegen unit and returns it along with
+    /// a `u64` giving an estimate of the unit's processing cost.
+    fn compile_codegen_unit(
+        &self,
+        tcx: TyCtxt<'_>,
+        cgu_name: Symbol,
+    ) -> (ModuleCodegen<Self::Module>, u64);
+    fn target_machine_factory(
+        &self,
+        sess: &Session,
+        opt_level: config::OptLevel,
+    ) -> Arc<dyn Fn() -> Result<Self::TargetMachine, String> + Send + Sync>;
+    fn target_cpu<'b>(&self, sess: &'b Session) -> &'b str;
+}