2 * TODO(antoyo): support #[inline] attributes.
3 * TODO(antoyo): support LTO.
5 * TODO(antoyo): remove the patches.
8 #![feature(rustc_private, decl_macro, associated_type_bounds, never_type, trusted_len)]
9 #![allow(broken_intra_doc_links)]
10 #![recursion_limit="256"]
11 #![warn(rust_2018_idioms)]
12 #![warn(unused_lifetimes)]
14 extern crate rustc_ast;
15 extern crate rustc_codegen_ssa;
16 extern crate rustc_data_structures;
17 extern crate rustc_errors;
18 extern crate rustc_hir;
19 extern crate rustc_metadata;
20 extern crate rustc_middle;
21 extern crate rustc_session;
22 extern crate rustc_span;
23 extern crate rustc_symbol_mangling;
24 extern crate rustc_target;
27 // This prevents duplicating functions and statics that are already part of the host rustc process.
28 #[allow(unused_extern_crates)]
29 extern crate rustc_driver;
53 use gccjit::{Context, OptimizationLevel};
54 use rustc_ast::expand::allocator::AllocatorKind;
55 use rustc_codegen_ssa::{CodegenResults, CompiledModule, ModuleCodegen};
56 use rustc_codegen_ssa::base::codegen_crate;
57 use rustc_codegen_ssa::back::write::{CodegenContext, FatLTOInput, ModuleConfig, TargetMachineFactoryFn};
58 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
59 use rustc_codegen_ssa::target_features::supported_target_features;
60 use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, ModuleBufferMethods, ThinBufferMethods, WriteBackendMethods};
61 use rustc_data_structures::fx::FxHashMap;
62 use rustc_errors::{ErrorReported, Handler};
63 use rustc_metadata::EncodedMetadata;
64 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
65 use rustc_middle::ty::TyCtxt;
66 use rustc_session::config::{Lto, OptLevel, OutputFilenames};
67 use rustc_session::Session;
68 use rustc_span::Symbol;
69 use rustc_span::fatal_error::FatalError;
71 pub struct PrintOnPanic<F: Fn() -> String>(pub F);
73 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
75 if ::std::thread::panicking() {
76 println!("{}", (self.0)());
82 pub struct GccCodegenBackend;
84 impl CodegenBackend for GccCodegenBackend {
85 fn init(&self, sess: &Session) {
86 if sess.lto() != Lto::No {
87 sess.warn("LTO is not supported. You may get a linker error.");
91 fn codegen_crate<'tcx>(&self, tcx: TyCtxt<'tcx>, metadata: EncodedMetadata, need_metadata_module: bool) -> Box<dyn Any> {
92 let target_cpu = target_cpu(tcx.sess);
93 let res = codegen_crate(self.clone(), tcx, target_cpu.to_string(), metadata, need_metadata_module);
95 rustc_symbol_mangling::test::report_symbol_names(tcx);
100 fn join_codegen(&self, ongoing_codegen: Box<dyn Any>, sess: &Session) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
101 let (codegen_results, work_products) = ongoing_codegen
102 .downcast::<rustc_codegen_ssa::back::write::OngoingCodegen<GccCodegenBackend>>()
103 .expect("Expected GccCodegenBackend's OngoingCodegen, found Box<Any>")
106 Ok((codegen_results, work_products))
109 fn link(&self, sess: &Session, codegen_results: CodegenResults, outputs: &OutputFilenames) -> Result<(), ErrorReported> {
110 use rustc_codegen_ssa::back::link::link_binary;
112 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
119 fn target_features(&self, sess: &Session) -> Vec<Symbol> {
120 target_features(sess)
124 impl ExtraBackendMethods for GccCodegenBackend {
125 fn new_metadata<'tcx>(&self, _tcx: TyCtxt<'tcx>, _mod_name: &str) -> Self::Module {
127 context: Context::default(),
131 fn write_compressed_metadata<'tcx>(&self, tcx: TyCtxt<'tcx>, metadata: &EncodedMetadata, gcc_module: &mut Self::Module) {
132 base::write_compressed_metadata(tcx, metadata, gcc_module)
135 fn codegen_allocator<'tcx>(&self, tcx: TyCtxt<'tcx>, mods: &mut Self::Module, module_name: &str, kind: AllocatorKind, has_alloc_error_handler: bool) {
136 unsafe { allocator::codegen(tcx, mods, module_name, kind, has_alloc_error_handler) }
139 fn compile_codegen_unit<'tcx>(&self, tcx: TyCtxt<'tcx>, cgu_name: Symbol) -> (ModuleCodegen<Self::Module>, u64) {
140 base::compile_codegen_unit(tcx, cgu_name)
143 fn target_machine_factory(&self, _sess: &Session, _opt_level: OptLevel) -> TargetMachineFactoryFn<Self> {
144 // TODO(antoyo): set opt level.
150 fn target_cpu<'b>(&self, _sess: &'b Session) -> &'b str {
154 fn tune_cpu<'b>(&self, _sess: &'b Session) -> Option<&'b str> {
160 pub struct ModuleBuffer;
162 impl ModuleBufferMethods for ModuleBuffer {
163 fn data(&self) -> &[u8] {
168 pub struct ThinBuffer;
170 impl ThinBufferMethods for ThinBuffer {
171 fn data(&self) -> &[u8] {
176 pub struct GccContext {
177 context: Context<'static>,
180 unsafe impl Send for GccContext {}
181 // FIXME(antoyo): that shouldn't be Sync. Parallel compilation is currently disabled with "-Zno-parallel-llvm". Try to disable it here.
182 unsafe impl Sync for GccContext {}
184 impl WriteBackendMethods for GccCodegenBackend {
185 type Module = GccContext;
186 type TargetMachine = ();
187 type ModuleBuffer = ModuleBuffer;
190 type ThinBuffer = ThinBuffer;
192 fn run_fat_lto(_cgcx: &CodegenContext<Self>, mut modules: Vec<FatLTOInput<Self>>, _cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>) -> Result<LtoModuleCodegen<Self>, FatalError> {
193 // TODO(antoyo): implement LTO by sending -flto to libgccjit and adding the appropriate gcc linker plugins.
194 // NOTE: implemented elsewhere.
195 // TODO: what is implemented elsewhere ^ ?
197 match modules.remove(0) {
198 FatLTOInput::InMemory(module) => module,
199 FatLTOInput::Serialized { .. } => {
203 Ok(LtoModuleCodegen::Fat { module: Some(module), _serialized_bitcode: vec![] })
206 fn run_thin_lto(_cgcx: &CodegenContext<Self>, _modules: Vec<(String, Self::ThinBuffer)>, _cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
210 fn print_pass_timings(&self) {
214 unsafe fn optimize(_cgcx: &CodegenContext<Self>, _diag_handler: &Handler, module: &ModuleCodegen<Self::Module>, config: &ModuleConfig) -> Result<(), FatalError> {
215 module.module_llvm.context.set_optimization_level(to_gcc_opt_level(config.opt_level));
219 unsafe fn optimize_thin(_cgcx: &CodegenContext<Self>, _thin: &mut ThinModule<Self>) -> Result<ModuleCodegen<Self::Module>, FatalError> {
223 unsafe fn codegen(cgcx: &CodegenContext<Self>, diag_handler: &Handler, module: ModuleCodegen<Self::Module>, config: &ModuleConfig) -> Result<CompiledModule, FatalError> {
224 back::write::codegen(cgcx, diag_handler, module, config)
227 fn prepare_thin(_module: ModuleCodegen<Self::Module>) -> (String, Self::ThinBuffer) {
231 fn serialize_module(_module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer) {
235 fn run_lto_pass_manager(_cgcx: &CodegenContext<Self>, _module: &ModuleCodegen<Self::Module>, _config: &ModuleConfig, _thin: bool) -> Result<(), FatalError> {
240 fn run_link(cgcx: &CodegenContext<Self>, diag_handler: &Handler, modules: Vec<ModuleCodegen<Self::Module>>) -> Result<ModuleCodegen<Self::Module>, FatalError> {
241 back::write::link(cgcx, diag_handler, modules)
245 /// This is the entrypoint for a hot plugged rustc_codegen_gccjit
247 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
248 Box::new(GccCodegenBackend)
251 fn to_gcc_opt_level(optlevel: Option<OptLevel>) -> OptimizationLevel {
253 None => OptimizationLevel::None,
256 OptLevel::No => OptimizationLevel::None,
257 OptLevel::Less => OptimizationLevel::Limited,
258 OptLevel::Default => OptimizationLevel::Standard,
259 OptLevel::Aggressive => OptimizationLevel::Aggressive,
260 OptLevel::Size | OptLevel::SizeMin => OptimizationLevel::Limited,
266 fn handle_native(name: &str) -> &str {
267 if name != "native" {
274 pub fn target_cpu(sess: &Session) -> &str {
275 let name = sess.opts.cg.target_cpu.as_ref().unwrap_or(&sess.target.cpu);
279 pub fn target_features(sess: &Session) -> Vec<Symbol> {
280 supported_target_features(sess)
284 if sess.is_nightly_build() || gate.is_none() { Some(feature) } else { None }
288 // TODO(antoyo): implement a way to get enabled feature in libgccjit.
291 .map(|feature| Symbol::intern(feature))