5 associated_type_bounds,
11 #![warn(rust_2018_idioms)]
12 #![warn(unused_lifetimes)]
13 #![warn(unreachable_pub)]
15 #[cfg(feature = "jit")]
19 extern crate rustc_middle;
20 extern crate rustc_ast;
21 extern crate rustc_codegen_ssa;
22 extern crate rustc_data_structures;
23 extern crate rustc_errors;
24 extern crate rustc_fs_util;
25 extern crate rustc_hir;
26 extern crate rustc_incremental;
27 extern crate rustc_index;
28 extern crate rustc_session;
29 extern crate rustc_span;
30 extern crate rustc_symbol_mangling;
31 extern crate rustc_target;
33 // This prevents duplicating functions and statics that are already part of the host rustc process.
34 #[allow(unused_extern_crates)]
35 extern crate rustc_driver;
38 use std::str::FromStr;
40 use rustc_codegen_ssa::traits::CodegenBackend;
41 use rustc_codegen_ssa::CodegenResults;
42 use rustc_errors::ErrorReported;
43 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
44 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
45 use rustc_middle::ty::query::Providers;
46 use rustc_session::config::OutputFilenames;
47 use rustc_session::Session;
49 use cranelift_codegen::settings::{self, Configurable};
51 use crate::constant::ConstantCx;
52 use crate::prelude::*;
84 pub(crate) use std::convert::{TryFrom, TryInto};
86 pub(crate) use rustc_ast::ast::{FloatTy, IntTy, UintTy};
87 pub(crate) use rustc_span::Span;
89 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
90 pub(crate) use rustc_middle::bug;
91 pub(crate) use rustc_middle::mir::{self, *};
92 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
93 pub(crate) use rustc_middle::ty::{
94 self, FnSig, Instance, InstanceDef, ParamEnv, Ty, TyCtxt, TypeAndMut, TypeFoldable,
96 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
98 pub(crate) use rustc_data_structures::fx::FxHashMap;
100 pub(crate) use rustc_index::vec::Idx;
102 pub(crate) use cranelift_codegen::entity::EntitySet;
103 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
104 pub(crate) use cranelift_codegen::ir::function::Function;
105 pub(crate) use cranelift_codegen::ir::types;
106 pub(crate) use cranelift_codegen::ir::{
107 AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
108 StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
110 pub(crate) use cranelift_codegen::isa::{self, CallConv};
111 pub(crate) use cranelift_codegen::Context;
112 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
113 pub(crate) use cranelift_module::{self, DataContext, DataId, FuncId, Linkage, Module};
115 pub(crate) use crate::abi::*;
116 pub(crate) use crate::base::{codegen_operand, codegen_place};
117 pub(crate) use crate::cast::*;
118 pub(crate) use crate::common::*;
119 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
120 pub(crate) use crate::pointer::Pointer;
121 pub(crate) use crate::trap::*;
122 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
125 struct PrintOnPanic<F: Fn() -> String>(F);
126 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
128 if ::std::thread::panicking() {
129 println!("{}", (self.0)());
134 struct CodegenCx<'tcx, M: Module> {
138 constants_cx: ConstantCx,
139 cached_context: Context,
140 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
141 debug_context: Option<DebugContext<'tcx>>,
142 unwind_context: UnwindContext<'tcx>,
145 impl<'tcx, M: Module> CodegenCx<'tcx, M> {
146 fn new(tcx: TyCtxt<'tcx>, module: M, debug_info: bool, pic_eh_frame: bool) -> Self {
147 let unwind_context = UnwindContext::new(tcx, module.isa(), pic_eh_frame);
148 let debug_context = if debug_info {
149 Some(DebugContext::new(tcx, module.isa()))
156 global_asm: String::new(),
157 constants_cx: ConstantCx::default(),
158 cached_context: Context::new(),
159 vtables: FxHashMap::default(),
165 fn finalize(mut self) -> (M, String, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
166 self.constants_cx.finalize(self.tcx, &mut self.module);
176 #[derive(Copy, Clone, Debug)]
177 pub enum CodegenMode {
183 impl Default for CodegenMode {
184 fn default() -> Self {
189 impl FromStr for CodegenMode {
192 fn from_str(s: &str) -> Result<Self, Self::Err> {
194 "aot" => Ok(CodegenMode::Aot),
195 "jit" => Ok(CodegenMode::Jit),
196 "jit-lazy" => Ok(CodegenMode::JitLazy),
197 _ => Err(format!("Unknown codegen mode `{}`", s)),
202 #[derive(Copy, Clone, Debug, Default)]
203 pub struct BackendConfig {
204 pub codegen_mode: CodegenMode,
208 fn from_opts(opts: &[String]) -> Result<Self, String> {
209 let mut config = BackendConfig::default();
211 if let Some((name, value)) = opt.split_once('=') {
213 "mode" => config.codegen_mode = value.parse()?,
214 _ => return Err(format!("Unknown option `{}`", name)),
217 return Err(format!("Invalid option `{}`", opt));
224 pub struct CraneliftCodegenBackend {
225 pub config: Option<BackendConfig>,
228 impl CodegenBackend for CraneliftCodegenBackend {
229 fn init(&self, sess: &Session) {
230 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
231 sess.warn("LTO is not supported. You may get a linker error.");
235 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
236 Box::new(crate::metadata::CraneliftMetadataLoader)
239 fn provide(&self, _providers: &mut Providers) {}
240 fn provide_extern(&self, _providers: &mut Providers) {}
242 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
246 fn codegen_crate<'tcx>(
249 metadata: EncodedMetadata,
250 need_metadata_module: bool,
252 let config = if let Some(config) = self.config {
255 BackendConfig::from_opts(&tcx.sess.opts.cg.llvm_args)
256 .unwrap_or_else(|err| tcx.sess.fatal(&err))
258 let res = driver::codegen_crate(tcx, metadata, need_metadata_module, config);
260 rustc_symbol_mangling::test::report_symbol_names(tcx);
267 ongoing_codegen: Box<dyn Any>,
269 ) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
271 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
278 codegen_results: CodegenResults,
279 outputs: &OutputFilenames,
280 ) -> Result<(), ErrorReported> {
281 use rustc_codegen_ssa::back::link::link_binary;
283 let _timer = sess.prof.generic_activity("link_crate");
285 sess.time("linking", || {
286 let target_cpu = crate::target_triple(sess).to_string();
287 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
291 &codegen_results.crate_name.as_str(),
300 fn target_triple(sess: &Session) -> target_lexicon::Triple {
301 sess.target.llvm_target.parse().unwrap()
304 fn build_isa(sess: &Session) -> Box<dyn isa::TargetIsa + 'static> {
305 use target_lexicon::BinaryFormat;
307 let target_triple = crate::target_triple(sess);
309 let mut flags_builder = settings::builder();
310 flags_builder.enable("is_pic").unwrap();
311 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
315 if cfg!(debug_assertions) {
323 let tls_model = match target_triple.binary_format {
324 BinaryFormat::Elf => "elf_gd",
325 BinaryFormat::Macho => "macho",
326 BinaryFormat::Coff => "coff",
329 flags_builder.set("tls_model", tls_model).unwrap();
331 flags_builder.set("enable_simd", "true").unwrap();
333 use rustc_session::config::OptLevel;
334 match sess.opts.optimize {
336 flags_builder.set("opt_level", "none").unwrap();
338 OptLevel::Less | OptLevel::Default => {}
339 OptLevel::Aggressive => {
340 flags_builder.set("opt_level", "speed_and_size").unwrap();
342 OptLevel::Size | OptLevel::SizeMin => {
343 sess.warn("Optimizing for size is not supported. Just ignoring the request");
347 let flags = settings::Flags::new(flags_builder);
349 let mut isa_builder = cranelift_codegen::isa::lookup(target_triple).unwrap();
350 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
351 // is interpreted as `bsr`.
352 isa_builder.enable("nehalem").unwrap();
353 isa_builder.finish(flags)
356 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
358 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
359 Box::new(CraneliftCodegenBackend { config: None })