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use super::write::WriteBackendMethods;
use super::CodegenObject;
use crate::back::write::TargetMachineFactoryFn;
use crate::{CodegenResults, ModuleCodegen};
use rustc_ast::expand::allocator::AllocatorKind;
use rustc_data_structures::fx::FxHashMap;
use rustc_errors::ErrorGuaranteed;
use rustc_metadata::EncodedMetadata;
use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
use rustc_middle::ty::layout::{FnAbiOf, HasTyCtxt, LayoutOf, TyAndLayout};
use rustc_middle::ty::query::{ExternProviders, Providers};
use rustc_middle::ty::{Ty, TyCtxt};
use rustc_session::{
config::{self, OutputFilenames, PrintRequest},
cstore::MetadataLoaderDyn,
Session,
};
use rustc_span::symbol::Symbol;
use rustc_target::abi::call::FnAbi;
use rustc_target::spec::Target;
pub use rustc_data_structures::sync::MetadataRef;
use std::any::Any;
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 DILocation: Copy;
type DIVariable: Copy;
}
pub trait Backend<'tcx>:
Sized
+ BackendTypes
+ HasTyCtxt<'tcx>
+ LayoutOf<'tcx, LayoutOfResult = TyAndLayout<'tcx>>
+ FnAbiOf<'tcx, FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>>
{
}
impl<'tcx, T> Backend<'tcx> for T where
Self: BackendTypes
+ HasTyCtxt<'tcx>
+ LayoutOf<'tcx, LayoutOfResult = TyAndLayout<'tcx>>
+ FnAbiOf<'tcx, FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>>
{
}
pub trait CodegenBackend {
fn init(&self, _sess: &Session) {}
fn print(&self, _req: PrintRequest, _sess: &Session) {}
fn target_features(&self, _sess: &Session, _allow_unstable: bool) -> Vec<Symbol> {
vec![]
}
fn print_passes(&self) {}
fn print_version(&self) {}
/// If this plugin provides additional builtin targets, provide the one enabled by the options here.
/// Be careful: this is called *before* init() is called.
fn target_override(&self, _opts: &config::Options) -> Option<Target> {
None
}
/// 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 metadata_loader(&self) -> Box<MetadataLoaderDyn> {
Box::new(crate::back::metadata::DefaultMetadataLoader)
}
fn provide(&self, _providers: &mut Providers) {}
fn provide_extern(&self, _providers: &mut ExternProviders) {}
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,
outputs: &OutputFilenames,
) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorGuaranteed>;
/// 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: CodegenResults,
outputs: &OutputFilenames,
) -> Result<(), ErrorGuaranteed>;
}
pub trait ExtraBackendMethods: CodegenBackend + WriteBackendMethods + Sized + Send + Sync {
fn codegen_allocator<'tcx>(
&self,
tcx: TyCtxt<'tcx>,
module_name: &str,
kind: AllocatorKind,
has_alloc_error_handler: bool,
) -> Self::Module;
/// 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,
target_features: &[String],
) -> TargetMachineFactoryFn<Self>;
fn spawn_thread<F, T>(_time_trace: bool, f: F) -> std::thread::JoinHandle<T>
where
F: FnOnce() -> T,
F: Send + 'static,
T: Send + 'static,
{
std::thread::spawn(f)
}
fn spawn_named_thread<F, T>(
_time_trace: bool,
name: String,
f: F,
) -> std::io::Result<std::thread::JoinHandle<T>>
where
F: FnOnce() -> T,
F: Send + 'static,
T: Send + 'static,
{
std::thread::Builder::new().name(name).spawn(f)
}
}
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