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::config::OutputFilenames;
33 use rustc_middle::ty::query::Providers;
34 use rustc_codegen_ssa::traits::CodegenBackend;
36 use cranelift_codegen::settings;
38 use crate::constant::ConstantCx;
39 use crate::prelude::*;
63 mod target_features_whitelist;
70 pub(crate) use std::convert::{TryFrom, TryInto};
72 pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
73 pub(crate) use rustc_span::Span;
75 pub(crate) use rustc_middle::bug;
76 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
77 pub(crate) use rustc_middle::mir::{self, *};
78 pub(crate) use rustc_session::Session;
79 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
80 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
81 pub(crate) use rustc_middle::ty::{
82 self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
85 pub(crate) use rustc_data_structures::fx::FxHashMap;
87 pub(crate) use rustc_index::vec::Idx;
89 pub(crate) use rustc_codegen_ssa::traits::*;
90 pub(crate) use rustc_codegen_ssa::{CodegenResults, CompiledModule, ModuleKind};
92 pub(crate) use cranelift_codegen::Context;
93 pub(crate) use cranelift_codegen::entity::EntitySet;
94 pub(crate) use cranelift_codegen::ir::{AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc, StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value};
95 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
96 pub(crate) use cranelift_codegen::ir::function::Function;
97 pub(crate) use cranelift_codegen::ir::types;
98 pub(crate) use cranelift_codegen::isa::{self, CallConv};
99 pub(crate) use cranelift_codegen::settings::{self, Configurable};
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, FunctionDebugContext, 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};
113 pub(crate) use crate::CodegenCx;
115 pub(crate) struct PrintOnPanic<F: Fn() -> String>(pub F);
116 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
118 if ::std::thread::panicking() {
119 println!("{}", (self.0)());
124 pub(crate) macro unimpl_fatal($tcx:expr, $span:expr, $($tt:tt)*) {
125 $tcx.sess.span_fatal($span, &format!($($tt)*));
129 pub(crate) struct CodegenCx<'tcx, B: Backend + 'static> {
132 constants_cx: ConstantCx,
133 cached_context: Context,
134 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
135 debug_context: Option<DebugContext<'tcx>>,
136 unwind_context: UnwindContext<'tcx>,
139 impl<'tcx, B: Backend + 'static> CodegenCx<'tcx, B> {
145 let unwind_context = UnwindContext::new(tcx, module.isa());
146 let debug_context = if debug_info {
147 Some(DebugContext::new(
157 constants_cx: ConstantCx::default(),
158 cached_context: Context::new(),
159 vtables: FxHashMap::default(),
165 fn finalize(mut self) -> (Module<B>, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
166 self.constants_cx.finalize(self.tcx, &mut self.module);
167 (self.module, self.debug_context, self.unwind_context)
171 struct CraneliftCodegenBackend;
173 impl CodegenBackend for CraneliftCodegenBackend {
174 fn init(&self, sess: &Session) {
175 if sess.lto() != rustc_session::config::Lto::No {
176 sess.warn("LTO is not supported. You may get a linker error.");
180 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
181 Box::new(crate::metadata::CraneliftMetadataLoader)
184 fn provide(&self, providers: &mut Providers<'_>) {
185 providers.target_features_whitelist = |tcx, cnum| {
186 assert_eq!(cnum, LOCAL_CRATE);
187 if tcx.sess.opts.actually_rustdoc {
188 // rustdoc needs to be able to document functions that use all the features, so
189 // whitelist them all
190 target_features_whitelist::all_known_features()
191 .map(|(a, b)| (a.to_string(), b))
194 target_features_whitelist::target_feature_whitelist(tcx.sess)
196 .map(|&(a, b)| (a.to_string(), b))
201 fn provide_extern(&self, _providers: &mut Providers<'_>) {}
203 fn codegen_crate<'tcx>(
206 metadata: EncodedMetadata,
207 need_metadata_module: bool,
209 let res = driver::codegen_crate(tcx, metadata, need_metadata_module);
211 rustc_symbol_mangling::test::report_symbol_names(tcx);
218 ongoing_codegen: Box<dyn Any>,
220 dep_graph: &DepGraph,
221 ) -> Result<Box<dyn Any>, ErrorReported> {
222 let (codegen_results, work_products) = *ongoing_codegen.downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>().unwrap();
224 sess.time("serialize_work_products", move || {
225 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
228 Ok(Box::new(codegen_results))
235 outputs: &OutputFilenames,
236 ) -> Result<(), ErrorReported> {
237 use rustc_codegen_ssa::back::link::link_binary;
239 let codegen_results = *res
240 .downcast::<CodegenResults>()
241 .expect("Expected CraneliftCodegenBackend's CodegenResult, found Box<Any>");
243 let _timer = sess.prof.generic_activity("link_crate");
245 sess.time("linking", || {
246 let target_cpu = crate::target_triple(sess).to_string();
247 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
251 &codegen_results.crate_name.as_str(),
256 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
262 fn target_triple(sess: &Session) -> target_lexicon::Triple {
263 sess.target.target.llvm_target.parse().unwrap()
266 fn build_isa(sess: &Session, enable_pic: bool) -> Box<dyn isa::TargetIsa + 'static> {
267 use target_lexicon::BinaryFormat;
269 let target_triple = crate::target_triple(sess);
271 let mut flags_builder = settings::builder();
273 flags_builder.enable("is_pic").unwrap();
275 flags_builder.set("is_pic", "false").unwrap();
277 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
281 if cfg!(debug_assertions) {
289 let tls_model = match target_triple.binary_format {
290 BinaryFormat::Elf => "elf_gd",
291 BinaryFormat::Macho => "macho",
292 BinaryFormat::Coff => "coff",
295 flags_builder.set("tls_model", tls_model).unwrap();
297 // FIXME(CraneStation/cranelift#732) fix LICM in presence of jump tables
299 use rustc_session::config::OptLevel;
300 match sess.opts.optimize {
302 flags_builder.set("opt_level", "none").unwrap();
304 OptLevel::Less | OptLevel::Default => {}
305 OptLevel::Aggressive => {
306 flags_builder.set("opt_level", "speed_and_size").unwrap();
308 OptLevel::Size | OptLevel::SizeMin => {
309 sess.warn("Optimizing for size is not supported. Just ignoring the request");
313 let flags = settings::Flags::new(flags_builder);
314 cranelift_codegen::isa::lookup(target_triple)
319 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
321 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
322 Box::new(CraneliftCodegenBackend)