1 #![feature(rustc_private, decl_macro, type_alias_impl_trait, associated_type_bounds, never_type, try_blocks)]
2 #![warn(rust_2018_idioms)]
3 #![warn(unused_lifetimes)]
6 #[cfg(feature = "jit")]
9 extern crate rustc_middle;
10 extern crate rustc_codegen_ssa;
11 extern crate rustc_data_structures;
12 extern crate rustc_errors;
13 extern crate rustc_fs_util;
14 extern crate rustc_hir;
15 extern crate rustc_incremental;
16 extern crate rustc_index;
17 extern crate rustc_mir;
18 extern crate rustc_session;
19 extern crate rustc_span;
20 extern crate rustc_symbol_mangling;
21 extern crate rustc_target;
22 extern crate rustc_ast;
24 // This prevents duplicating functions and statics that are already part of the host rustc process.
25 #[allow(unused_extern_crates)]
26 extern crate rustc_driver;
30 use rustc_errors::ErrorReported;
31 use rustc_middle::dep_graph::{DepGraph, WorkProduct, WorkProductId};
32 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
33 use rustc_session::Session;
34 use rustc_session::config::OutputFilenames;
35 use rustc_middle::ty::query::Providers;
36 use rustc_codegen_ssa::CodegenResults;
37 use rustc_codegen_ssa::traits::CodegenBackend;
39 use cranelift_codegen::settings::{self, Configurable};
41 use crate::constant::ConstantCx;
42 use crate::prelude::*;
67 mod target_features_whitelist;
75 pub(crate) use std::convert::{TryFrom, TryInto};
77 pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
78 pub(crate) use rustc_span::Span;
80 pub(crate) use rustc_middle::bug;
81 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
82 pub(crate) use rustc_middle::mir::{self, *};
83 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
84 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
85 pub(crate) use rustc_middle::ty::{
86 self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
89 pub(crate) use rustc_data_structures::fx::FxHashMap;
91 pub(crate) use rustc_index::vec::Idx;
93 pub(crate) use cranelift_codegen::Context;
94 pub(crate) use cranelift_codegen::entity::EntitySet;
95 pub(crate) use cranelift_codegen::ir::{AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc, StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value};
96 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
97 pub(crate) use cranelift_codegen::ir::function::Function;
98 pub(crate) use cranelift_codegen::ir::types;
99 pub(crate) use cranelift_codegen::isa::{self, CallConv};
100 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
101 pub(crate) use cranelift_module::{
102 self, Backend, DataContext, DataId, FuncId, Linkage, Module,
105 pub(crate) use crate::abi::*;
106 pub(crate) use crate::base::{trans_operand, trans_place};
107 pub(crate) use crate::cast::*;
108 pub(crate) use crate::common::*;
109 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
110 pub(crate) use crate::pointer::Pointer;
111 pub(crate) use crate::trap::*;
112 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
115 struct PrintOnPanic<F: Fn() -> String>(F);
116 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
118 if ::std::thread::panicking() {
119 println!("{}", (self.0)());
124 struct CodegenCx<'tcx, B: Backend + 'static> {
128 constants_cx: ConstantCx,
129 cached_context: Context,
130 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
131 debug_context: Option<DebugContext<'tcx>>,
132 unwind_context: UnwindContext<'tcx>,
135 impl<'tcx, B: Backend + 'static> CodegenCx<'tcx, B> {
141 let unwind_context = UnwindContext::new(tcx, module.isa());
142 let debug_context = if debug_info {
143 Some(DebugContext::new(
153 global_asm: String::new(),
154 constants_cx: ConstantCx::default(),
155 cached_context: Context::new(),
156 vtables: FxHashMap::default(),
162 fn finalize(mut self) -> (Module<B>, String, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
163 self.constants_cx.finalize(self.codegen_cx.tcx, &mut self.codegen_cx.module);
164 (self.codegen_cx.module, self.global_asm, self.debug_context, self.unwind_context)
168 struct CraneliftCodegenBackend;
170 impl CodegenBackend for CraneliftCodegenBackend {
171 fn init(&self, sess: &Session) {
172 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
173 sess.warn("LTO is not supported. You may get a linker error.");
177 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
178 Box::new(crate::metadata::CraneliftMetadataLoader)
181 fn provide(&self, providers: &mut Providers) {
182 providers.supported_target_features = |tcx, cnum| {
183 assert_eq!(cnum, LOCAL_CRATE);
184 if tcx.sess.opts.actually_rustdoc {
185 // rustdoc needs to be able to document functions that use all the features, so
186 // whitelist them all
187 target_features_whitelist::all_known_features()
188 .map(|(a, b)| (a.to_string(), b))
191 target_features_whitelist::supported_target_features(tcx.sess)
193 .map(|&(a, b)| (a.to_string(), b))
198 fn provide_extern(&self, _providers: &mut Providers) {}
200 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
204 fn codegen_crate<'tcx>(
207 metadata: EncodedMetadata,
208 need_metadata_module: bool,
210 let res = driver::codegen_crate(tcx, metadata, need_metadata_module);
212 rustc_symbol_mangling::test::report_symbol_names(tcx);
219 ongoing_codegen: Box<dyn Any>,
221 dep_graph: &DepGraph,
222 ) -> Result<Box<dyn Any>, ErrorReported> {
223 let (codegen_results, work_products) = *ongoing_codegen.downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>().unwrap();
225 sess.time("serialize_work_products", move || {
226 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
229 Ok(Box::new(codegen_results))
236 outputs: &OutputFilenames,
237 ) -> Result<(), ErrorReported> {
238 use rustc_codegen_ssa::back::link::link_binary;
240 sess.abort_if_errors();
242 let codegen_results = *res
243 .downcast::<CodegenResults>()
244 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
246 let _timer = sess.prof.generic_activity("link_crate");
248 sess.time("linking", || {
249 let target_cpu = crate::target_triple(sess).to_string();
250 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
254 &codegen_results.crate_name.as_str(),
259 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
265 fn target_triple(sess: &Session) -> target_lexicon::Triple {
266 sess.target.target.llvm_target.parse().unwrap()
269 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
270 use target_lexicon::BinaryFormat;
272 let target_triple = crate::target_triple(sess);
274 let mut flags_builder = settings::builder();
276 flags_builder.enable("is_pic").unwrap();
278 flags_builder.set("is_pic", "false").unwrap();
280 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
284 if cfg!(debug_assertions) {
292 let tls_model = match target_triple.binary_format {
293 BinaryFormat::Elf => "elf_gd",
294 BinaryFormat::Macho => "macho",
295 BinaryFormat::Coff => "coff",
298 flags_builder.set("tls_model", tls_model).unwrap();
300 flags_builder.set("enable_simd", "true").unwrap();
302 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
304 use rustc_session::config::OptLevel;
305 match sess.opts.optimize {
307 flags_builder.set("opt_level", "none").unwrap();
309 OptLevel::Less | OptLevel::Default => {}
310 OptLevel::Aggressive => {
311 flags_builder.set("opt_level", "speed_and_size").unwrap();
313 OptLevel::Size | OptLevel::SizeMin => {
314 sess.warn("Optimizing for size is not supported. Just ignoring the request");
318 let flags = settings::Flags::new(flags_builder);
320 let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
321 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
322 // is interpreted as `bsr`.
323 isa_builder.enable("nehalem").unwrap();
324 isa_builder.finish(flags)
327 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
329 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
330 Box::new(CraneliftCodegenBackend)