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use rustc::ty::layout::{HasTyCtxt, LayoutOf, TyLayout};
use rustc::ty::Ty;
use super::write::WriteBackendMethods;
use super::CodegenObject;
use rustc::middle::cstore::EncodedMetadata;
use rustc::session::{Session, config};
use rustc::ty::TyCtxt;
use rustc_codegen_utils::codegen_backend::CodegenBackend;
use std::sync::Arc;
use std::sync::mpsc;
use syntax::expand::allocator::AllocatorKind;
use syntax_pos::symbol::Symbol;
pub trait BackendTypes {
type Value: CodegenObject;
type Function: CodegenObject;
type BasicBlock: Copy;
type Type: CodegenObject;
type Funclet;
type DIScope: Copy;
}
pub trait Backend<'tcx>:
Sized + BackendTypes + HasTyCtxt<'tcx> + LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
{
}
impl<'tcx, T> Backend<'tcx> for T where
Self: BackendTypes + HasTyCtxt<'tcx> + LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
{
}
pub trait ExtraBackendMethods: CodegenBackend + WriteBackendMethods + Sized + Send {
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,
);
fn compile_codegen_unit(
&self,
tcx: TyCtxt<'_>,
cgu_name: Symbol,
tx_to_llvm_workers: &mpsc::Sender<Box<dyn std::any::Any + Send>>,
);
// If find_features is true this won't access `sess.crate_types` by assuming
// that `is_pie_binary` is false. When we discover LLVM target features
// `sess.crate_types` is uninitialized so we cannot access it.
fn target_machine_factory(
&self,
sess: &Session,
opt_level: config::OptLevel,
find_features: bool,
) -> Arc<dyn Fn() -> Result<Self::TargetMachine, String> + Send + Sync>;
fn target_cpu<'b>(&self, sess: &'b Session) -> &'b str;
}
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