5 associated_type_bounds,
9 #![warn(rust_2018_idioms)]
10 #![warn(unused_lifetimes)]
12 #[cfg(feature = "jit")]
15 extern crate rustc_middle;
16 extern crate rustc_ast;
17 extern crate rustc_codegen_ssa;
18 extern crate rustc_data_structures;
19 extern crate rustc_errors;
20 extern crate rustc_fs_util;
21 extern crate rustc_hir;
22 extern crate rustc_incremental;
23 extern crate rustc_index;
24 extern crate rustc_mir;
25 extern crate rustc_session;
26 extern crate rustc_span;
27 extern crate rustc_symbol_mangling;
28 extern crate rustc_target;
30 // This prevents duplicating functions and statics that are already part of the host rustc process.
31 #[allow(unused_extern_crates)]
32 extern crate rustc_driver;
36 use rustc_codegen_ssa::traits::CodegenBackend;
37 use rustc_codegen_ssa::CodegenResults;
38 use rustc_errors::ErrorReported;
39 use rustc_middle::dep_graph::{DepGraph, WorkProduct, WorkProductId};
40 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
41 use rustc_middle::ty::query::Providers;
42 use rustc_session::config::OutputFilenames;
43 use rustc_session::Session;
45 use cranelift_codegen::settings::{self, Configurable};
47 use crate::constant::ConstantCx;
48 use crate::prelude::*;
73 mod target_features_whitelist;
81 pub(crate) use std::convert::{TryFrom, TryInto};
83 pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
84 pub(crate) use rustc_span::Span;
86 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
87 pub(crate) use rustc_middle::bug;
88 pub(crate) use rustc_middle::mir::{self, *};
89 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
90 pub(crate) use rustc_middle::ty::{
91 self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
93 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
95 pub(crate) use rustc_data_structures::fx::FxHashMap;
97 pub(crate) use rustc_index::vec::Idx;
99 pub(crate) use cranelift_codegen::entity::EntitySet;
100 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
101 pub(crate) use cranelift_codegen::ir::function::Function;
102 pub(crate) use cranelift_codegen::ir::types;
103 pub(crate) use cranelift_codegen::ir::{
104 AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
105 StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
107 pub(crate) use cranelift_codegen::isa::{self, CallConv};
108 pub(crate) use cranelift_codegen::Context;
109 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
110 pub(crate) use cranelift_module::{
111 self, Backend, DataContext, DataId, FuncId, Linkage, Module,
114 pub(crate) use crate::abi::*;
115 pub(crate) use crate::base::{trans_operand, trans_place};
116 pub(crate) use crate::cast::*;
117 pub(crate) use crate::common::*;
118 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
119 pub(crate) use crate::pointer::Pointer;
120 pub(crate) use crate::trap::*;
121 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
124 struct PrintOnPanic<F: Fn() -> String>(F);
125 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
127 if ::std::thread::panicking() {
128 println!("{}", (self.0)());
133 struct CodegenCx<'tcx, B: Backend + 'static> {
137 constants_cx: ConstantCx,
138 cached_context: Context,
139 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
140 debug_context: Option<DebugContext<'tcx>>,
141 unwind_context: UnwindContext<'tcx>,
144 impl<'tcx, B: Backend + 'static> CodegenCx<'tcx, B> {
145 fn new(tcx: TyCtxt<'tcx>, module: Module<B>, debug_info: bool) -> Self {
146 let unwind_context = UnwindContext::new(tcx, module.isa());
147 let debug_context = if debug_info {
148 Some(DebugContext::new(tcx, module.isa()))
155 global_asm: String::new(),
156 constants_cx: ConstantCx::default(),
157 cached_context: Context::new(),
158 vtables: FxHashMap::default(),
169 Option<DebugContext<'tcx>>,
172 self.constants_cx.finalize(self.tcx, &mut self.module);
182 struct CraneliftCodegenBackend;
184 impl CodegenBackend for CraneliftCodegenBackend {
185 fn init(&self, sess: &Session) {
186 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
187 sess.warn("LTO is not supported. You may get a linker error.");
191 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
192 Box::new(crate::metadata::CraneliftMetadataLoader)
195 fn provide(&self, providers: &mut Providers) {
196 providers.supported_target_features = |tcx, cnum| {
197 assert_eq!(cnum, LOCAL_CRATE);
198 if tcx.sess.opts.actually_rustdoc {
199 // rustdoc needs to be able to document functions that use all the features, so
200 // whitelist them all
201 target_features_whitelist::all_known_features()
202 .map(|(a, b)| (a.to_string(), b))
205 target_features_whitelist::supported_target_features(tcx.sess)
207 .map(|&(a, b)| (a.to_string(), b))
212 fn provide_extern(&self, _providers: &mut Providers) {}
214 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
218 fn codegen_crate<'tcx>(
221 metadata: EncodedMetadata,
222 need_metadata_module: bool,
224 let res = driver::codegen_crate(tcx, metadata, need_metadata_module);
226 rustc_symbol_mangling::test::report_symbol_names(tcx);
233 ongoing_codegen: Box<dyn Any>,
235 dep_graph: &DepGraph,
236 ) -> Result<Box<dyn Any>, ErrorReported> {
237 let (codegen_results, work_products) = *ongoing_codegen
238 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
241 sess.time("serialize_work_products", move || {
242 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
245 Ok(Box::new(codegen_results))
252 outputs: &OutputFilenames,
253 ) -> Result<(), ErrorReported> {
254 use rustc_codegen_ssa::back::link::link_binary;
256 sess.abort_if_errors();
258 let codegen_results = *res
259 .downcast::<CodegenResults>()
260 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
262 let _timer = sess.prof.generic_activity("link_crate");
264 sess.time("linking", || {
265 let target_cpu = crate::target_triple(sess).to_string();
266 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
270 &codegen_results.crate_name.as_str(),
275 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
281 fn target_triple(sess: &Session) -> target_lexicon::Triple {
282 sess.target.target.llvm_target.parse().unwrap()
285 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
286 use target_lexicon::BinaryFormat;
288 let target_triple = crate::target_triple(sess);
290 let mut flags_builder = settings::builder();
292 flags_builder.enable("is_pic").unwrap();
294 flags_builder.set("is_pic", "false").unwrap();
296 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
300 if cfg!(debug_assertions) {
308 let tls_model = match target_triple.binary_format {
309 BinaryFormat::Elf => "elf_gd",
310 BinaryFormat::Macho => "macho",
311 BinaryFormat::Coff => "coff",
314 flags_builder.set("tls_model", tls_model).unwrap();
316 flags_builder.set("enable_simd", "true").unwrap();
318 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
320 use rustc_session::config::OptLevel;
321 match sess.opts.optimize {
323 flags_builder.set("opt_level", "none").unwrap();
325 OptLevel::Less | OptLevel::Default => {}
326 OptLevel::Aggressive => {
327 flags_builder.set("opt_level", "speed_and_size").unwrap();
329 OptLevel::Size | OptLevel::SizeMin => {
330 sess.warn("Optimizing for size is not supported. Just ignoring the request");
334 let flags = settings::Flags::new(flags_builder);
336 let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
337 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
338 // is interpreted as `bsr`.
339 isa_builder.enable("nehalem").unwrap();
340 isa_builder.finish(flags)
343 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
345 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
346 Box::new(CraneliftCodegenBackend)