1 #![feature(rustc_private, decl_macro, type_alias_impl_trait, associated_type_bounds, never_type)]
2 #![allow(intra_doc_link_resolution_failure)]
3 #![warn(rust_2018_idioms)]
4 #![warn(unused_lifetimes)]
8 extern crate rustc_middle;
9 extern crate rustc_codegen_ssa;
10 extern crate rustc_data_structures;
11 extern crate rustc_errors;
12 extern crate rustc_fs_util;
13 extern crate rustc_hir;
14 extern crate rustc_incremental;
15 extern crate rustc_index;
16 extern crate rustc_mir;
17 extern crate rustc_session;
18 extern crate rustc_span;
19 extern crate rustc_symbol_mangling;
20 extern crate rustc_target;
21 extern crate rustc_ast;
23 // This prevents duplicating functions and statics that are already part of the host rustc process.
24 #[allow(unused_extern_crates)]
25 extern crate rustc_driver;
29 use rustc_errors::ErrorReported;
30 use rustc_middle::dep_graph::{DepGraph, WorkProduct, WorkProductId};
31 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
32 use rustc_session::Session;
33 use rustc_session::config::OutputFilenames;
34 use rustc_middle::ty::query::Providers;
35 use rustc_codegen_ssa::CodegenResults;
36 use rustc_codegen_ssa::traits::CodegenBackend;
38 use cranelift_codegen::settings::{self, Configurable};
40 use crate::constant::ConstantCx;
41 use crate::prelude::*;
65 mod target_features_whitelist;
72 pub(crate) use std::convert::{TryFrom, TryInto};
74 pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
75 pub(crate) use rustc_span::Span;
77 pub(crate) use rustc_middle::bug;
78 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
79 pub(crate) use rustc_middle::mir::{self, *};
80 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
81 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
82 pub(crate) use rustc_middle::ty::{
83 self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
86 pub(crate) use rustc_data_structures::fx::FxHashMap;
88 pub(crate) use rustc_index::vec::Idx;
90 pub(crate) use cranelift_codegen::Context;
91 pub(crate) use cranelift_codegen::entity::EntitySet;
92 pub(crate) use cranelift_codegen::ir::{AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc, StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value};
93 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
94 pub(crate) use cranelift_codegen::ir::function::Function;
95 pub(crate) use cranelift_codegen::ir::types;
96 pub(crate) use cranelift_codegen::isa::{self, CallConv};
97 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
98 pub(crate) use cranelift_module::{
99 self, Backend, DataContext, DataId, FuncId, Linkage, Module,
102 pub(crate) use crate::abi::*;
103 pub(crate) use crate::base::{trans_operand, trans_place};
104 pub(crate) use crate::cast::*;
105 pub(crate) use crate::common::*;
106 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
107 pub(crate) use crate::pointer::Pointer;
108 pub(crate) use crate::trap::*;
109 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
112 struct PrintOnPanic<F: Fn() -> String>(F);
113 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
115 if ::std::thread::panicking() {
116 println!("{}", (self.0)());
121 struct CodegenCx<'tcx, B: Backend + 'static> {
124 constants_cx: ConstantCx,
125 cached_context: Context,
126 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
127 debug_context: Option<DebugContext<'tcx>>,
128 unwind_context: UnwindContext<'tcx>,
131 impl<'tcx, B: Backend + 'static> CodegenCx<'tcx, B> {
137 let unwind_context = UnwindContext::new(tcx, module.isa());
138 let debug_context = if debug_info {
139 Some(DebugContext::new(
149 constants_cx: ConstantCx::default(),
150 cached_context: Context::new(),
151 vtables: FxHashMap::default(),
157 fn finalize(mut self) -> (Module<B>, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
158 self.constants_cx.finalize(self.tcx, &mut self.module);
159 (self.module, self.debug_context, self.unwind_context)
163 struct CraneliftCodegenBackend;
165 impl CodegenBackend for CraneliftCodegenBackend {
166 fn init(&self, sess: &Session) {
167 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
168 sess.warn("LTO is not supported. You may get a linker error.");
172 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
173 Box::new(crate::metadata::CraneliftMetadataLoader)
176 fn provide(&self, providers: &mut Providers<'_>) {
177 providers.target_features_whitelist = |tcx, cnum| {
178 assert_eq!(cnum, LOCAL_CRATE);
179 if tcx.sess.opts.actually_rustdoc {
180 // rustdoc needs to be able to document functions that use all the features, so
181 // whitelist them all
182 target_features_whitelist::all_known_features()
183 .chain(Some(("cg_clif", None)))
184 .map(|(a, b)| (a.to_string(), b))
187 target_features_whitelist::target_feature_whitelist(tcx.sess)
189 .chain(&Some(("cg_clif", None)))
190 .map(|&(a, b)| (a.to_string(), b))
195 fn provide_extern(&self, _providers: &mut Providers<'_>) {}
197 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
198 vec![rustc_span::Symbol::intern("cg_clif")]
201 fn codegen_crate<'tcx>(
204 metadata: EncodedMetadata,
205 need_metadata_module: bool,
207 let res = driver::codegen_crate(tcx, metadata, need_metadata_module);
209 rustc_symbol_mangling::test::report_symbol_names(tcx);
216 ongoing_codegen: Box<dyn Any>,
218 dep_graph: &DepGraph,
219 ) -> Result<Box<dyn Any>, ErrorReported> {
220 let (codegen_results, work_products) = *ongoing_codegen.downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>().unwrap();
222 sess.time("serialize_work_products", move || {
223 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
226 Ok(Box::new(codegen_results))
233 outputs: &OutputFilenames,
234 ) -> Result<(), ErrorReported> {
235 use rustc_codegen_ssa::back::link::link_binary;
237 let codegen_results = *res
238 .downcast::<CodegenResults>()
239 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
241 let _timer = sess.prof.generic_activity("link_crate");
243 sess.time("linking", || {
244 let target_cpu = crate::target_triple(sess).to_string();
245 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
249 &codegen_results.crate_name.as_str(),
254 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
260 fn target_triple(sess: &Session) -> target_lexicon::Triple {
261 sess.target.target.llvm_target.parse().unwrap()
264 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
265 use target_lexicon::BinaryFormat;
267 let target_triple = crate::target_triple(sess);
269 let mut flags_builder = settings::builder();
271 flags_builder.enable("is_pic").unwrap();
273 flags_builder.set("is_pic", "false").unwrap();
275 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
279 if cfg!(debug_assertions) {
287 let tls_model = match target_triple.binary_format {
288 BinaryFormat::Elf => "elf_gd",
289 BinaryFormat::Macho => "macho",
290 BinaryFormat::Coff => "coff",
293 flags_builder.set("tls_model", tls_model).unwrap();
295 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
297 use rustc_session::config::OptLevel;
298 match sess.opts.optimize {
300 flags_builder.set("opt_level", "none").unwrap();
302 OptLevel::Less | OptLevel::Default => {}
303 OptLevel::Aggressive => {
304 flags_builder.set("opt_level", "speed_and_size").unwrap();
306 OptLevel::Size | OptLevel::SizeMin => {
307 sess.warn("Optimizing for size is not supported. Just ignoring the request");
311 let flags = settings::Flags::new(flags_builder);
312 cranelift_codegen::isa::lookup(target_triple)
317 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
319 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
320 Box::new(CraneliftCodegenBackend)