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::{self, DataContext, DataId, FuncId, Linkage, Module};
113 pub(crate) use crate::abi::*;
114 pub(crate) use crate::base::{trans_operand, trans_place};
115 pub(crate) use crate::cast::*;
116 pub(crate) use crate::common::*;
117 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
118 pub(crate) use crate::pointer::Pointer;
119 pub(crate) use crate::trap::*;
120 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
123 struct PrintOnPanic<F: Fn() -> String>(F);
124 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
126 if ::std::thread::panicking() {
127 println!("{}", (self.0)());
132 struct CodegenCx<'tcx, M: Module> {
136 constants_cx: ConstantCx,
137 cached_context: Context,
138 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
139 debug_context: Option<DebugContext<'tcx>>,
140 unwind_context: UnwindContext<'tcx>,
143 impl<'tcx, M: Module> CodegenCx<'tcx, M> {
144 fn new(tcx: TyCtxt<'tcx>, module: M, debug_info: bool) -> Self {
145 let unwind_context = UnwindContext::new(tcx, module.isa());
146 let debug_context = if debug_info {
147 Some(DebugContext::new(tcx, module.isa()))
154 global_asm: String::new(),
155 constants_cx: ConstantCx::default(),
156 cached_context: Context::new(),
157 vtables: FxHashMap::default(),
163 fn finalize(mut self) -> (M, String, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
164 self.constants_cx.finalize(self.tcx, &mut self.module);
174 #[derive(Copy, Clone, Debug)]
175 pub struct BackendConfig {
179 pub struct CraneliftCodegenBackend {
180 pub config: BackendConfig,
183 impl CodegenBackend for CraneliftCodegenBackend {
184 fn init(&self, sess: &Session) {
185 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
186 sess.warn("LTO is not supported. You may get a linker error.");
190 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
191 Box::new(crate::metadata::CraneliftMetadataLoader)
194 fn provide(&self, providers: &mut Providers) {
195 providers.supported_target_features = |tcx, cnum| {
196 assert_eq!(cnum, LOCAL_CRATE);
197 if tcx.sess.opts.actually_rustdoc {
198 // rustdoc needs to be able to document functions that use all the features, so
199 // whitelist them all
200 rustc_codegen_ssa::target_features::all_known_features()
201 .map(|(a, b)| (a.to_string(), b))
204 rustc_codegen_ssa::target_features::supported_target_features(tcx.sess)
206 .map(|&(a, b)| (a.to_string(), b))
211 fn provide_extern(&self, _providers: &mut Providers) {}
213 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
217 fn codegen_crate<'tcx>(
220 metadata: EncodedMetadata,
221 need_metadata_module: bool,
223 let res = driver::codegen_crate(tcx, metadata, need_metadata_module, self.config);
225 rustc_symbol_mangling::test::report_symbol_names(tcx);
232 ongoing_codegen: Box<dyn Any>,
234 dep_graph: &DepGraph,
235 ) -> Result<Box<dyn Any>, ErrorReported> {
236 let (codegen_results, work_products) = *ongoing_codegen
237 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
240 sess.time("serialize_work_products", move || {
241 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
244 Ok(Box::new(codegen_results))
251 outputs: &OutputFilenames,
252 ) -> Result<(), ErrorReported> {
253 use rustc_codegen_ssa::back::link::link_binary;
255 sess.abort_if_errors();
257 let codegen_results = *res
258 .downcast::<CodegenResults>()
259 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
261 let _timer = sess.prof.generic_activity("link_crate");
263 sess.time("linking", || {
264 let target_cpu = crate::target_triple(sess).to_string();
265 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
269 &codegen_results.crate_name.as_str(),
274 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
280 fn target_triple(sess: &Session) -> target_lexicon::Triple {
281 sess.target.target.llvm_target.parse().unwrap()
284 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
285 use target_lexicon::BinaryFormat;
287 let target_triple = crate::target_triple(sess);
289 let mut flags_builder = settings::builder();
291 flags_builder.enable("is_pic").unwrap();
293 flags_builder.set("is_pic", "false").unwrap();
295 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
299 if cfg!(debug_assertions) {
307 let tls_model = match target_triple.binary_format {
308 BinaryFormat::Elf => "elf_gd",
309 BinaryFormat::Macho => "macho",
310 BinaryFormat::Coff => "coff",
313 flags_builder.set("tls_model", tls_model).unwrap();
315 flags_builder.set("enable_simd", "true").unwrap();
317 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
319 use rustc_session::config::OptLevel;
320 match sess.opts.optimize {
322 flags_builder.set("opt_level", "none").unwrap();
324 OptLevel::Less | OptLevel::Default => {}
325 OptLevel::Aggressive => {
326 flags_builder.set("opt_level", "speed_and_size").unwrap();
328 OptLevel::Size | OptLevel::SizeMin => {
329 sess.warn("Optimizing for size is not supported. Just ignoring the request");
333 let flags = settings::Flags::new(flags_builder);
335 let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
336 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
337 // is interpreted as `bsr`.
338 isa_builder.enable("nehalem").unwrap();
339 isa_builder.finish(flags)
342 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
344 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
345 Box::new(CraneliftCodegenBackend {
346 config: BackendConfig { use_jit: false },