5 associated_type_bounds,
10 #![warn(rust_2018_idioms)]
11 #![warn(unused_lifetimes)]
13 #[cfg(feature = "jit")]
17 extern crate rustc_middle;
18 extern crate rustc_ast;
19 extern crate rustc_codegen_ssa;
20 extern crate rustc_data_structures;
21 extern crate rustc_errors;
22 extern crate rustc_fs_util;
23 extern crate rustc_hir;
24 extern crate rustc_incremental;
25 extern crate rustc_index;
26 extern crate rustc_mir;
27 extern crate rustc_session;
28 extern crate rustc_span;
29 extern crate rustc_symbol_mangling;
30 extern crate rustc_target;
32 // This prevents duplicating functions and statics that are already part of the host rustc process.
33 #[allow(unused_extern_crates)]
34 extern crate rustc_driver;
38 use rustc_codegen_ssa::traits::CodegenBackend;
39 use rustc_codegen_ssa::CodegenResults;
40 use rustc_errors::ErrorReported;
41 use rustc_middle::dep_graph::{DepGraph, WorkProduct, WorkProductId};
42 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
43 use rustc_middle::ty::query::Providers;
44 use rustc_session::config::OutputFilenames;
45 use rustc_session::Session;
47 use cranelift_codegen::settings::{self, Configurable};
49 use crate::constant::ConstantCx;
50 use crate::prelude::*;
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 #[derive(Copy, Clone, Debug)]
184 pub struct BackendConfig {
188 pub struct CraneliftCodegenBackend {
189 pub config: BackendConfig,
192 impl CodegenBackend for CraneliftCodegenBackend {
193 fn init(&self, sess: &Session) {
194 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
195 sess.warn("LTO is not supported. You may get a linker error.");
199 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
200 Box::new(crate::metadata::CraneliftMetadataLoader)
203 fn provide(&self, providers: &mut Providers) {
204 providers.supported_target_features = |tcx, cnum| {
205 assert_eq!(cnum, LOCAL_CRATE);
206 if tcx.sess.opts.actually_rustdoc {
207 // rustdoc needs to be able to document functions that use all the features, so
208 // whitelist them all
209 rustc_codegen_ssa::target_features::all_known_features()
210 .map(|(a, b)| (a.to_string(), b))
213 rustc_codegen_ssa::target_features::supported_target_features(tcx.sess)
215 .map(|&(a, b)| (a.to_string(), b))
220 fn provide_extern(&self, _providers: &mut Providers) {}
222 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
226 fn codegen_crate<'tcx>(
229 metadata: EncodedMetadata,
230 need_metadata_module: bool,
232 let res = driver::codegen_crate(tcx, metadata, need_metadata_module, self.config);
234 rustc_symbol_mangling::test::report_symbol_names(tcx);
241 ongoing_codegen: Box<dyn Any>,
243 dep_graph: &DepGraph,
244 ) -> Result<Box<dyn Any>, ErrorReported> {
245 let (codegen_results, work_products) = *ongoing_codegen
246 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
249 sess.time("serialize_work_products", move || {
250 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
253 Ok(Box::new(codegen_results))
260 outputs: &OutputFilenames,
261 ) -> Result<(), ErrorReported> {
262 use rustc_codegen_ssa::back::link::link_binary;
264 sess.abort_if_errors();
266 let codegen_results = *res
267 .downcast::<CodegenResults>()
268 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
270 let _timer = sess.prof.generic_activity("link_crate");
272 sess.time("linking", || {
273 let target_cpu = crate::target_triple(sess).to_string();
274 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
278 &codegen_results.crate_name.as_str(),
283 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
289 fn target_triple(sess: &Session) -> target_lexicon::Triple {
290 sess.target.target.llvm_target.parse().unwrap()
293 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
294 use target_lexicon::BinaryFormat;
296 let target_triple = crate::target_triple(sess);
298 let mut flags_builder = settings::builder();
300 flags_builder.enable("is_pic").unwrap();
302 flags_builder.set("is_pic", "false").unwrap();
304 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
308 if cfg!(debug_assertions) {
316 let tls_model = match target_triple.binary_format {
317 BinaryFormat::Elf => "elf_gd",
318 BinaryFormat::Macho => "macho",
319 BinaryFormat::Coff => "coff",
322 flags_builder.set("tls_model", tls_model).unwrap();
324 flags_builder.set("enable_simd", "true").unwrap();
326 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
328 use rustc_session::config::OptLevel;
329 match sess.opts.optimize {
331 flags_builder.set("opt_level", "none").unwrap();
333 OptLevel::Less | OptLevel::Default => {}
334 OptLevel::Aggressive => {
335 flags_builder.set("opt_level", "speed_and_size").unwrap();
337 OptLevel::Size | OptLevel::SizeMin => {
338 sess.warn("Optimizing for size is not supported. Just ignoring the request");
342 let flags = settings::Flags::new(flags_builder);
344 let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
345 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
346 // is interpreted as `bsr`.
347 isa_builder.enable("nehalem").unwrap();
348 isa_builder.finish(flags)
351 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
353 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
354 Box::new(CraneliftCodegenBackend {
355 config: BackendConfig {