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::*;
75 mod target_features_whitelist;
83 pub(crate) use std::convert::{TryFrom, TryInto};
85 pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
86 pub(crate) use rustc_span::Span;
88 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
89 pub(crate) use rustc_middle::bug;
90 pub(crate) use rustc_middle::mir::{self, *};
91 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
92 pub(crate) use rustc_middle::ty::{
93 self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
95 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
97 pub(crate) use rustc_data_structures::fx::FxHashMap;
99 pub(crate) use rustc_index::vec::Idx;
101 pub(crate) use cranelift_codegen::entity::EntitySet;
102 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
103 pub(crate) use cranelift_codegen::ir::function::Function;
104 pub(crate) use cranelift_codegen::ir::types;
105 pub(crate) use cranelift_codegen::ir::{
106 AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
107 StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
109 pub(crate) use cranelift_codegen::isa::{self, CallConv};
110 pub(crate) use cranelift_codegen::Context;
111 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
112 pub(crate) use cranelift_module::{
113 self, Backend, DataContext, DataId, FuncId, Linkage, Module,
116 pub(crate) use crate::abi::*;
117 pub(crate) use crate::base::{trans_operand, trans_place};
118 pub(crate) use crate::cast::*;
119 pub(crate) use crate::common::*;
120 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
121 pub(crate) use crate::pointer::Pointer;
122 pub(crate) use crate::trap::*;
123 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
126 struct PrintOnPanic<F: Fn() -> String>(F);
127 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
129 if ::std::thread::panicking() {
130 println!("{}", (self.0)());
135 struct CodegenCx<'tcx, B: Backend + 'static> {
139 constants_cx: ConstantCx,
140 cached_context: Context,
141 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
142 debug_context: Option<DebugContext<'tcx>>,
143 unwind_context: UnwindContext<'tcx>,
146 impl<'tcx, B: Backend + 'static> CodegenCx<'tcx, B> {
147 fn new(tcx: TyCtxt<'tcx>, module: Module<B>, debug_info: bool) -> Self {
148 let unwind_context = UnwindContext::new(tcx, module.isa());
149 let debug_context = if debug_info {
150 Some(DebugContext::new(tcx, module.isa()))
157 global_asm: String::new(),
158 constants_cx: ConstantCx::default(),
159 cached_context: Context::new(),
160 vtables: FxHashMap::default(),
171 Option<DebugContext<'tcx>>,
174 self.constants_cx.finalize(self.tcx, &mut self.module);
184 #[derive(Copy, Clone, Debug)]
185 pub struct BackendConfig {
189 pub struct CraneliftCodegenBackend {
190 pub config: BackendConfig,
193 impl CodegenBackend for CraneliftCodegenBackend {
194 fn init(&self, sess: &Session) {
195 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
196 sess.warn("LTO is not supported. You may get a linker error.");
200 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
201 Box::new(crate::metadata::CraneliftMetadataLoader)
204 fn provide(&self, providers: &mut Providers) {
205 providers.supported_target_features = |tcx, cnum| {
206 assert_eq!(cnum, LOCAL_CRATE);
207 if tcx.sess.opts.actually_rustdoc {
208 // rustdoc needs to be able to document functions that use all the features, so
209 // whitelist them all
210 target_features_whitelist::all_known_features()
211 .map(|(a, b)| (a.to_string(), b))
214 target_features_whitelist::supported_target_features(tcx.sess)
216 .map(|&(a, b)| (a.to_string(), b))
221 fn provide_extern(&self, _providers: &mut Providers) {}
223 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
227 fn codegen_crate<'tcx>(
230 metadata: EncodedMetadata,
231 need_metadata_module: bool,
233 let res = driver::codegen_crate(tcx, metadata, need_metadata_module, self.config);
235 rustc_symbol_mangling::test::report_symbol_names(tcx);
242 ongoing_codegen: Box<dyn Any>,
244 dep_graph: &DepGraph,
245 ) -> Result<Box<dyn Any>, ErrorReported> {
246 let (codegen_results, work_products) = *ongoing_codegen
247 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
250 sess.time("serialize_work_products", move || {
251 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
254 Ok(Box::new(codegen_results))
261 outputs: &OutputFilenames,
262 ) -> Result<(), ErrorReported> {
263 use rustc_codegen_ssa::back::link::link_binary;
265 sess.abort_if_errors();
267 let codegen_results = *res
268 .downcast::<CodegenResults>()
269 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
271 let _timer = sess.prof.generic_activity("link_crate");
273 sess.time("linking", || {
274 let target_cpu = crate::target_triple(sess).to_string();
275 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
279 &codegen_results.crate_name.as_str(),
284 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
290 fn target_triple(sess: &Session) -> target_lexicon::Triple {
291 sess.target.target.llvm_target.parse().unwrap()
294 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
295 use target_lexicon::BinaryFormat;
297 let target_triple = crate::target_triple(sess);
299 let mut flags_builder = settings::builder();
301 flags_builder.enable("is_pic").unwrap();
303 flags_builder.set("is_pic", "false").unwrap();
305 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
309 if cfg!(debug_assertions) {
317 let tls_model = match target_triple.binary_format {
318 BinaryFormat::Elf => "elf_gd",
319 BinaryFormat::Macho => "macho",
320 BinaryFormat::Coff => "coff",
323 flags_builder.set("tls_model", tls_model).unwrap();
325 flags_builder.set("enable_simd", "true").unwrap();
327 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
329 use rustc_session::config::OptLevel;
330 match sess.opts.optimize {
332 flags_builder.set("opt_level", "none").unwrap();
334 OptLevel::Less | OptLevel::Default => {}
335 OptLevel::Aggressive => {
336 flags_builder.set("opt_level", "speed_and_size").unwrap();
338 OptLevel::Size | OptLevel::SizeMin => {
339 sess.warn("Optimizing for size is not supported. Just ignoring the request");
343 let flags = settings::Flags::new(flags_builder);
345 let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
346 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
347 // is interpreted as `bsr`.
348 isa_builder.enable("nehalem").unwrap();
349 isa_builder.finish(flags)
352 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
354 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
355 Box::new(CraneliftCodegenBackend {
356 config: BackendConfig {