5 associated_type_bounds,
9 #![warn(rust_2018_idioms)]
10 #![warn(unused_lifetimes)]
13 #[cfg(feature = "jit")]
16 extern crate rustc_middle;
17 extern crate rustc_ast;
18 extern crate rustc_codegen_ssa;
19 extern crate rustc_data_structures;
20 extern crate rustc_errors;
21 extern crate rustc_fs_util;
22 extern crate rustc_hir;
23 extern crate rustc_incremental;
24 extern crate rustc_index;
25 extern crate rustc_mir;
26 extern crate rustc_session;
27 extern crate rustc_span;
28 extern crate rustc_symbol_mangling;
29 extern crate rustc_target;
31 // This prevents duplicating functions and statics that are already part of the host rustc process.
32 #[allow(unused_extern_crates)]
33 extern crate rustc_driver;
37 use rustc_codegen_ssa::traits::CodegenBackend;
38 use rustc_codegen_ssa::CodegenResults;
39 use rustc_errors::ErrorReported;
40 use rustc_middle::dep_graph::{DepGraph, WorkProduct, WorkProductId};
41 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
42 use rustc_middle::ty::query::Providers;
43 use rustc_session::config::OutputFilenames;
44 use rustc_session::Session;
46 use cranelift_codegen::settings::{self, Configurable};
48 use crate::constant::ConstantCx;
49 use crate::prelude::*;
74 mod target_features_whitelist;
82 pub(crate) use std::convert::{TryFrom, TryInto};
84 pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
85 pub(crate) use rustc_span::Span;
87 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
88 pub(crate) use rustc_middle::bug;
89 pub(crate) use rustc_middle::mir::{self, *};
90 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
91 pub(crate) use rustc_middle::ty::{
92 self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
94 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
96 pub(crate) use rustc_data_structures::fx::FxHashMap;
98 pub(crate) use rustc_index::vec::Idx;
100 pub(crate) use cranelift_codegen::entity::EntitySet;
101 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
102 pub(crate) use cranelift_codegen::ir::function::Function;
103 pub(crate) use cranelift_codegen::ir::types;
104 pub(crate) use cranelift_codegen::ir::{
105 AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
106 StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
108 pub(crate) use cranelift_codegen::isa::{self, CallConv};
109 pub(crate) use cranelift_codegen::Context;
110 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
111 pub(crate) use cranelift_module::{
112 self, Backend, DataContext, DataId, FuncId, Linkage, Module,
115 pub(crate) use crate::abi::*;
116 pub(crate) use crate::base::{trans_operand, trans_place};
117 pub(crate) use crate::cast::*;
118 pub(crate) use crate::common::*;
119 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
120 pub(crate) use crate::pointer::Pointer;
121 pub(crate) use crate::trap::*;
122 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
125 struct PrintOnPanic<F: Fn() -> String>(F);
126 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
128 if ::std::thread::panicking() {
129 println!("{}", (self.0)());
134 struct CodegenCx<'tcx, B: Backend + 'static> {
138 constants_cx: ConstantCx,
139 cached_context: Context,
140 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
141 debug_context: Option<DebugContext<'tcx>>,
142 unwind_context: UnwindContext<'tcx>,
145 impl<'tcx, B: Backend + 'static> CodegenCx<'tcx, B> {
146 fn new(tcx: TyCtxt<'tcx>, module: Module<B>, debug_info: bool) -> Self {
147 let unwind_context = UnwindContext::new(tcx, module.isa());
148 let debug_context = if debug_info {
149 Some(DebugContext::new(tcx, module.isa()))
156 global_asm: String::new(),
157 constants_cx: ConstantCx::default(),
158 cached_context: Context::new(),
159 vtables: FxHashMap::default(),
170 Option<DebugContext<'tcx>>,
173 self.constants_cx.finalize(self.tcx, &mut self.module);
183 struct CraneliftCodegenBackend;
185 impl CodegenBackend for CraneliftCodegenBackend {
186 fn init(&self, sess: &Session) {
187 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
188 sess.warn("LTO is not supported. You may get a linker error.");
192 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
193 Box::new(crate::metadata::CraneliftMetadataLoader)
196 fn provide(&self, providers: &mut Providers) {
197 providers.supported_target_features = |tcx, cnum| {
198 assert_eq!(cnum, LOCAL_CRATE);
199 if tcx.sess.opts.actually_rustdoc {
200 // rustdoc needs to be able to document functions that use all the features, so
201 // whitelist them all
202 target_features_whitelist::all_known_features()
203 .map(|(a, b)| (a.to_string(), b))
206 target_features_whitelist::supported_target_features(tcx.sess)
208 .map(|&(a, b)| (a.to_string(), b))
213 fn provide_extern(&self, _providers: &mut Providers) {}
215 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
219 fn codegen_crate<'tcx>(
222 metadata: EncodedMetadata,
223 need_metadata_module: bool,
225 let res = driver::codegen_crate(tcx, metadata, need_metadata_module);
227 rustc_symbol_mangling::test::report_symbol_names(tcx);
234 ongoing_codegen: Box<dyn Any>,
236 dep_graph: &DepGraph,
237 ) -> Result<Box<dyn Any>, ErrorReported> {
238 let (codegen_results, work_products) = *ongoing_codegen
239 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
242 sess.time("serialize_work_products", move || {
243 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
246 Ok(Box::new(codegen_results))
253 outputs: &OutputFilenames,
254 ) -> Result<(), ErrorReported> {
255 use rustc_codegen_ssa::back::link::link_binary;
257 sess.abort_if_errors();
259 let codegen_results = *res
260 .downcast::<CodegenResults>()
261 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
263 let _timer = sess.prof.generic_activity("link_crate");
265 sess.time("linking", || {
266 let target_cpu = crate::target_triple(sess).to_string();
267 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
271 &codegen_results.crate_name.as_str(),
276 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
282 fn target_triple(sess: &Session) -> target_lexicon::Triple {
283 sess.target.target.llvm_target.parse().unwrap()
286 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
287 use target_lexicon::BinaryFormat;
289 let target_triple = crate::target_triple(sess);
291 let mut flags_builder = settings::builder();
293 flags_builder.enable("is_pic").unwrap();
295 flags_builder.set("is_pic", "false").unwrap();
297 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
301 if cfg!(debug_assertions) {
309 let tls_model = match target_triple.binary_format {
310 BinaryFormat::Elf => "elf_gd",
311 BinaryFormat::Macho => "macho",
312 BinaryFormat::Coff => "coff",
315 flags_builder.set("tls_model", tls_model).unwrap();
317 flags_builder.set("enable_simd", "true").unwrap();
319 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
321 use rustc_session::config::OptLevel;
322 match sess.opts.optimize {
324 flags_builder.set("opt_level", "none").unwrap();
326 OptLevel::Less | OptLevel::Default => {}
327 OptLevel::Aggressive => {
328 flags_builder.set("opt_level", "speed_and_size").unwrap();
330 OptLevel::Size | OptLevel::SizeMin => {
331 sess.warn("Optimizing for size is not supported. Just ignoring the request");
335 let flags = settings::Flags::new(flags_builder);
337 let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
338 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
339 // is interpreted as `bsr`.
340 isa_builder.enable("nehalem").unwrap();
341 isa_builder.finish(flags)
344 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
346 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
347 Box::new(CraneliftCodegenBackend)