5 associated_type_bounds,
10 #![warn(rust_2018_idioms)]
11 #![warn(unused_lifetimes)]
12 #![warn(unreachable_pub)]
16 extern crate rustc_middle;
17 extern crate rustc_ast;
18 extern crate rustc_codegen_ssa;
19 extern crate rustc_data_structures;
20 extern crate rustc_errors;
21 extern crate rustc_fs_util;
22 extern crate rustc_hir;
23 extern crate rustc_incremental;
24 extern crate rustc_index;
25 extern crate rustc_session;
26 extern crate rustc_span;
27 extern crate rustc_target;
29 // This prevents duplicating functions and statics that are already part of the host rustc process.
30 #[allow(unused_extern_crates)]
31 extern crate rustc_driver;
34 use std::str::FromStr;
36 use rustc_codegen_ssa::traits::CodegenBackend;
37 use rustc_codegen_ssa::CodegenResults;
38 use rustc_errors::ErrorReported;
39 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
40 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
41 use rustc_middle::ty::query::Providers;
42 use rustc_session::config::OutputFilenames;
43 use rustc_session::Session;
45 use cranelift_codegen::settings::{self, Configurable};
47 use crate::constant::ConstantCx;
48 use crate::prelude::*;
79 pub(crate) use std::convert::{TryFrom, TryInto};
81 pub(crate) use rustc_span::Span;
83 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
84 pub(crate) use rustc_middle::bug;
85 pub(crate) use rustc_middle::mir::{self, *};
86 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
87 pub(crate) use rustc_middle::ty::{
88 self, FloatTy, Instance, InstanceDef, IntTy, ParamEnv, Ty, TyCtxt, TypeAndMut,
91 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
93 pub(crate) use rustc_data_structures::fx::FxHashMap;
95 pub(crate) use rustc_index::vec::Idx;
97 pub(crate) use cranelift_codegen::entity::EntitySet;
98 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
99 pub(crate) use cranelift_codegen::ir::function::Function;
100 pub(crate) use cranelift_codegen::ir::types;
101 pub(crate) use cranelift_codegen::ir::{
102 AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
103 StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
105 pub(crate) use cranelift_codegen::isa::{self, CallConv};
106 pub(crate) use cranelift_codegen::Context;
107 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
108 pub(crate) use cranelift_module::{self, DataContext, DataId, FuncId, Linkage, Module};
110 pub(crate) use crate::abi::*;
111 pub(crate) use crate::base::{codegen_operand, codegen_place};
112 pub(crate) use crate::cast::*;
113 pub(crate) use crate::common::*;
114 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
115 pub(crate) use crate::pointer::Pointer;
116 pub(crate) use crate::trap::*;
117 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
120 struct PrintOnPanic<F: Fn() -> String>(F);
121 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
123 if ::std::thread::panicking() {
124 println!("{}", (self.0)());
129 struct CodegenCx<'m, 'tcx: 'm> {
131 module: &'m mut dyn Module,
133 constants_cx: ConstantCx,
134 cached_context: Context,
135 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
136 debug_context: Option<DebugContext<'tcx>>,
137 unwind_context: UnwindContext<'tcx>,
140 impl<'m, 'tcx> CodegenCx<'m, 'tcx> {
143 backend_config: BackendConfig,
144 module: &'m mut dyn Module,
147 let unwind_context = UnwindContext::new(
150 matches!(backend_config.codegen_mode, CodegenMode::Aot),
153 if debug_info { Some(DebugContext::new(tcx, module.isa())) } else { None };
157 global_asm: String::new(),
158 constants_cx: ConstantCx::default(),
159 cached_context: Context::new(),
160 vtables: FxHashMap::default(),
166 fn finalize(self) -> (String, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
167 self.constants_cx.finalize(self.tcx, self.module);
168 (self.global_asm, self.debug_context, self.unwind_context)
172 #[derive(Copy, Clone, Debug)]
173 pub enum CodegenMode {
179 impl Default for CodegenMode {
180 fn default() -> Self {
185 impl FromStr for CodegenMode {
188 fn from_str(s: &str) -> Result<Self, Self::Err> {
190 "aot" => Ok(CodegenMode::Aot),
191 "jit" => Ok(CodegenMode::Jit),
192 "jit-lazy" => Ok(CodegenMode::JitLazy),
193 _ => Err(format!("Unknown codegen mode `{}`", s)),
198 #[derive(Copy, Clone, Debug, Default)]
199 pub struct BackendConfig {
200 pub codegen_mode: CodegenMode,
204 fn from_opts(opts: &[String]) -> Result<Self, String> {
205 let mut config = BackendConfig::default();
207 if let Some((name, value)) = opt.split_once('=') {
209 "mode" => config.codegen_mode = value.parse()?,
210 _ => return Err(format!("Unknown option `{}`", name)),
213 return Err(format!("Invalid option `{}`", opt));
220 pub struct CraneliftCodegenBackend {
221 pub config: Option<BackendConfig>,
224 impl CodegenBackend for CraneliftCodegenBackend {
225 fn init(&self, sess: &Session) {
226 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
227 sess.warn("LTO is not supported. You may get a linker error.");
231 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
232 Box::new(crate::metadata::CraneliftMetadataLoader)
235 fn provide(&self, _providers: &mut Providers) {}
236 fn provide_extern(&self, _providers: &mut Providers) {}
238 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
242 fn codegen_crate<'tcx>(
245 metadata: EncodedMetadata,
246 need_metadata_module: bool,
248 let config = if let Some(config) = self.config {
251 BackendConfig::from_opts(&tcx.sess.opts.cg.llvm_args)
252 .unwrap_or_else(|err| tcx.sess.fatal(&err))
254 let res = driver::codegen_crate(tcx, metadata, need_metadata_module, config);
261 ongoing_codegen: Box<dyn Any>,
263 ) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
265 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
272 codegen_results: CodegenResults,
273 outputs: &OutputFilenames,
274 ) -> Result<(), ErrorReported> {
275 use rustc_codegen_ssa::back::link::link_binary;
277 let target_cpu = crate::target_triple(sess).to_string();
278 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
282 &codegen_results.crate_name.as_str(),
290 fn target_triple(sess: &Session) -> target_lexicon::Triple {
291 sess.target.llvm_target.parse().unwrap()
294 fn build_isa(sess: &Session) -> 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();
300 flags_builder.enable("is_pic").unwrap();
301 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
303 .set("enable_verifier", if cfg!(debug_assertions) { "true" } else { "false" })
306 let tls_model = match target_triple.binary_format {
307 BinaryFormat::Elf => "elf_gd",
308 BinaryFormat::Macho => "macho",
309 BinaryFormat::Coff => "coff",
312 flags_builder.set("tls_model", tls_model).unwrap();
314 flags_builder.set("enable_simd", "true").unwrap();
316 use rustc_session::config::OptLevel;
317 match sess.opts.optimize {
319 flags_builder.set("opt_level", "none").unwrap();
321 OptLevel::Less | OptLevel::Default => {}
322 OptLevel::Aggressive => {
323 flags_builder.set("opt_level", "speed_and_size").unwrap();
325 OptLevel::Size | OptLevel::SizeMin => {
326 sess.warn("Optimizing for size is not supported. Just ignoring the request");
330 let flags = settings::Flags::new(flags_builder);
332 let variant = cranelift_codegen::isa::BackendVariant::MachInst;
333 let mut isa_builder = cranelift_codegen::isa::lookup_variant(target_triple, variant).unwrap();
334 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
335 // is interpreted as `bsr`.
336 isa_builder.enable("nehalem").unwrap();
337 isa_builder.finish(flags)
340 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
342 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
343 Box::new(CraneliftCodegenBackend { config: None })