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;
26 // This prevents duplicating functions and statics that are already part of the host rustc process.
27 #[allow(unused_extern_crates)]
28 extern crate rustc_driver;
52 use gccjit::{Context, OptimizationLevel};
53 use rustc_ast::expand::allocator::AllocatorKind;
54 use rustc_codegen_ssa::{CodegenResults, CompiledModule, ModuleCodegen};
55 use rustc_codegen_ssa::base::codegen_crate;
56 use rustc_codegen_ssa::back::write::{CodegenContext, FatLTOInput, ModuleConfig, TargetMachineFactoryFn};
57 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
58 use rustc_codegen_ssa::target_features::supported_target_features;
59 use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, ModuleBufferMethods, ThinBufferMethods, WriteBackendMethods};
60 use rustc_data_structures::fx::FxHashMap;
61 use rustc_errors::{ErrorReported, Handler};
62 use rustc_metadata::EncodedMetadata;
63 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
64 use rustc_middle::ty::TyCtxt;
65 use rustc_session::config::{Lto, OptLevel, OutputFilenames};
66 use rustc_session::Session;
67 use rustc_span::Symbol;
68 use rustc_span::fatal_error::FatalError;
70 pub struct PrintOnPanic<F: Fn() -> String>(pub F);
72 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
74 if ::std::thread::panicking() {
75 println!("{}", (self.0)());
81 pub struct GccCodegenBackend;
83 impl CodegenBackend for GccCodegenBackend {
84 fn init(&self, sess: &Session) {
85 if sess.lto() != Lto::No {
86 sess.warn("LTO is not supported. You may get a linker error.");
90 fn codegen_crate<'tcx>(&self, tcx: TyCtxt<'tcx>, metadata: EncodedMetadata, need_metadata_module: bool) -> Box<dyn Any> {
91 let target_cpu = target_cpu(tcx.sess);
92 let res = codegen_crate(self.clone(), tcx, target_cpu.to_string(), metadata, need_metadata_module);
97 fn join_codegen(&self, ongoing_codegen: Box<dyn Any>, sess: &Session, _outputs: &OutputFilenames) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
98 let (codegen_results, work_products) = ongoing_codegen
99 .downcast::<rustc_codegen_ssa::back::write::OngoingCodegen<GccCodegenBackend>>()
100 .expect("Expected GccCodegenBackend's OngoingCodegen, found Box<Any>")
103 Ok((codegen_results, work_products))
106 fn link(&self, sess: &Session, codegen_results: CodegenResults, outputs: &OutputFilenames) -> Result<(), ErrorReported> {
107 use rustc_codegen_ssa::back::link::link_binary;
109 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
116 fn target_features(&self, sess: &Session) -> Vec<Symbol> {
117 target_features(sess)
121 impl ExtraBackendMethods for GccCodegenBackend {
122 fn new_metadata<'tcx>(&self, _tcx: TyCtxt<'tcx>, _mod_name: &str) -> Self::Module {
124 context: Context::default(),
128 fn codegen_allocator<'tcx>(&self, tcx: TyCtxt<'tcx>, mods: &mut Self::Module, module_name: &str, kind: AllocatorKind, has_alloc_error_handler: bool) {
129 unsafe { allocator::codegen(tcx, mods, module_name, kind, has_alloc_error_handler) }
132 fn compile_codegen_unit<'tcx>(&self, tcx: TyCtxt<'tcx>, cgu_name: Symbol) -> (ModuleCodegen<Self::Module>, u64) {
133 base::compile_codegen_unit(tcx, cgu_name)
136 fn target_machine_factory(&self, _sess: &Session, _opt_level: OptLevel) -> TargetMachineFactoryFn<Self> {
137 // TODO(antoyo): set opt level.
143 fn target_cpu<'b>(&self, _sess: &'b Session) -> &'b str {
147 fn tune_cpu<'b>(&self, _sess: &'b Session) -> Option<&'b str> {
153 pub struct ModuleBuffer;
155 impl ModuleBufferMethods for ModuleBuffer {
156 fn data(&self) -> &[u8] {
161 pub struct ThinBuffer;
163 impl ThinBufferMethods for ThinBuffer {
164 fn data(&self) -> &[u8] {
169 pub struct GccContext {
170 context: Context<'static>,
173 unsafe impl Send for GccContext {}
174 // FIXME(antoyo): that shouldn't be Sync. Parallel compilation is currently disabled with "-Zno-parallel-llvm". Try to disable it here.
175 unsafe impl Sync for GccContext {}
177 impl WriteBackendMethods for GccCodegenBackend {
178 type Module = GccContext;
179 type TargetMachine = ();
180 type ModuleBuffer = ModuleBuffer;
183 type ThinBuffer = ThinBuffer;
185 fn run_fat_lto(_cgcx: &CodegenContext<Self>, mut modules: Vec<FatLTOInput<Self>>, _cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>) -> Result<LtoModuleCodegen<Self>, FatalError> {
186 // TODO(antoyo): implement LTO by sending -flto to libgccjit and adding the appropriate gcc linker plugins.
187 // NOTE: implemented elsewhere.
188 // TODO: what is implemented elsewhere ^ ?
190 match modules.remove(0) {
191 FatLTOInput::InMemory(module) => module,
192 FatLTOInput::Serialized { .. } => {
196 Ok(LtoModuleCodegen::Fat { module: Some(module), _serialized_bitcode: vec![] })
199 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> {
203 fn print_pass_timings(&self) {
207 unsafe fn optimize(_cgcx: &CodegenContext<Self>, _diag_handler: &Handler, module: &ModuleCodegen<Self::Module>, config: &ModuleConfig) -> Result<(), FatalError> {
208 module.module_llvm.context.set_optimization_level(to_gcc_opt_level(config.opt_level));
212 unsafe fn optimize_thin(_cgcx: &CodegenContext<Self>, _thin: &mut ThinModule<Self>) -> Result<ModuleCodegen<Self::Module>, FatalError> {
216 unsafe fn codegen(cgcx: &CodegenContext<Self>, diag_handler: &Handler, module: ModuleCodegen<Self::Module>, config: &ModuleConfig) -> Result<CompiledModule, FatalError> {
217 back::write::codegen(cgcx, diag_handler, module, config)
220 fn prepare_thin(_module: ModuleCodegen<Self::Module>) -> (String, Self::ThinBuffer) {
224 fn serialize_module(_module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer) {
228 fn run_lto_pass_manager(_cgcx: &CodegenContext<Self>, _module: &ModuleCodegen<Self::Module>, _config: &ModuleConfig, _thin: bool) -> Result<(), FatalError> {
233 fn run_link(cgcx: &CodegenContext<Self>, diag_handler: &Handler, modules: Vec<ModuleCodegen<Self::Module>>) -> Result<ModuleCodegen<Self::Module>, FatalError> {
234 back::write::link(cgcx, diag_handler, modules)
238 /// This is the entrypoint for a hot plugged rustc_codegen_gccjit
240 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
241 Box::new(GccCodegenBackend)
244 fn to_gcc_opt_level(optlevel: Option<OptLevel>) -> OptimizationLevel {
246 None => OptimizationLevel::None,
249 OptLevel::No => OptimizationLevel::None,
250 OptLevel::Less => OptimizationLevel::Limited,
251 OptLevel::Default => OptimizationLevel::Standard,
252 OptLevel::Aggressive => OptimizationLevel::Aggressive,
253 OptLevel::Size | OptLevel::SizeMin => OptimizationLevel::Limited,
259 fn handle_native(name: &str) -> &str {
260 if name != "native" {
267 pub fn target_cpu(sess: &Session) -> &str {
268 let name = sess.opts.cg.target_cpu.as_ref().unwrap_or(&sess.target.cpu);
272 pub fn target_features(sess: &Session) -> Vec<Symbol> {
273 supported_target_features(sess)
277 if sess.is_nightly_build() || gate.is_none() { Some(feature) } else { None }
281 // TODO(antoyo): implement a way to get enabled feature in libgccjit.
284 .map(|feature| Symbol::intern(feature))