5 associated_type_bounds,
11 #![warn(rust_2018_idioms)]
12 #![warn(unused_lifetimes)]
13 #![warn(unreachable_pub)]
17 extern crate rustc_middle;
18 extern crate rustc_ast;
19 extern crate rustc_codegen_ssa;
20 extern crate rustc_data_structures;
21 extern crate rustc_errors;
22 extern crate rustc_fs_util;
23 extern crate rustc_hir;
24 extern crate rustc_incremental;
25 extern crate rustc_index;
26 extern crate rustc_session;
27 extern crate rustc_span;
28 extern crate rustc_target;
30 // This prevents duplicating functions and statics that are already part of the host rustc process.
31 #[allow(unused_extern_crates)]
32 extern crate rustc_driver;
35 use std::str::FromStr;
37 use rustc_codegen_ssa::traits::CodegenBackend;
38 use rustc_codegen_ssa::CodegenResults;
39 use rustc_errors::ErrorReported;
40 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
41 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
42 use rustc_middle::ty::query::Providers;
43 use rustc_session::config::OutputFilenames;
44 use rustc_session::Session;
46 use cranelift_codegen::settings::{self, Configurable};
48 use crate::constant::ConstantCx;
49 use crate::prelude::*;
80 pub(crate) use std::convert::{TryFrom, TryInto};
82 pub(crate) use rustc_span::Span;
84 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
85 pub(crate) use rustc_middle::bug;
86 pub(crate) use rustc_middle::mir::{self, *};
87 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
88 pub(crate) use rustc_middle::ty::{
89 self, FloatTy, Instance, InstanceDef, IntTy, ParamEnv, Ty, TyCtxt, TypeAndMut,
92 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
94 pub(crate) use rustc_data_structures::fx::FxHashMap;
96 pub(crate) use rustc_index::vec::Idx;
98 pub(crate) use cranelift_codegen::entity::EntitySet;
99 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
100 pub(crate) use cranelift_codegen::ir::function::Function;
101 pub(crate) use cranelift_codegen::ir::types;
102 pub(crate) use cranelift_codegen::ir::{
103 AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
104 StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
106 pub(crate) use cranelift_codegen::isa::{self, CallConv};
107 pub(crate) use cranelift_codegen::Context;
108 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
109 pub(crate) use cranelift_module::{self, DataContext, DataId, FuncId, Linkage, Module};
111 pub(crate) use crate::abi::*;
112 pub(crate) use crate::base::{codegen_operand, codegen_place};
113 pub(crate) use crate::cast::*;
114 pub(crate) use crate::common::*;
115 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
116 pub(crate) use crate::pointer::Pointer;
117 pub(crate) use crate::trap::*;
118 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
121 struct PrintOnPanic<F: Fn() -> String>(F);
122 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
124 if ::std::thread::panicking() {
125 println!("{}", (self.0)());
130 struct CodegenCx<'m, 'tcx: 'm> {
132 module: &'m mut dyn Module,
134 constants_cx: ConstantCx,
135 cached_context: Context,
136 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
137 debug_context: Option<DebugContext<'tcx>>,
138 unwind_context: UnwindContext<'tcx>,
141 impl<'m, 'tcx> CodegenCx<'m, 'tcx> {
144 backend_config: BackendConfig,
145 module: &'m mut dyn Module,
148 let unwind_context = UnwindContext::new(
151 matches!(backend_config.codegen_mode, CodegenMode::Aot),
154 if debug_info { Some(DebugContext::new(tcx, module.isa())) } else { None };
158 global_asm: String::new(),
159 constants_cx: ConstantCx::default(),
160 cached_context: Context::new(),
161 vtables: FxHashMap::default(),
167 fn finalize(self) -> (String, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
168 self.constants_cx.finalize(self.tcx, self.module);
169 (self.global_asm, self.debug_context, self.unwind_context)
173 #[derive(Copy, Clone, Debug)]
174 pub enum CodegenMode {
180 impl Default for CodegenMode {
181 fn default() -> Self {
186 impl FromStr for CodegenMode {
189 fn from_str(s: &str) -> Result<Self, Self::Err> {
191 "aot" => Ok(CodegenMode::Aot),
192 "jit" => Ok(CodegenMode::Jit),
193 "jit-lazy" => Ok(CodegenMode::JitLazy),
194 _ => Err(format!("Unknown codegen mode `{}`", s)),
199 #[derive(Copy, Clone, Debug, Default)]
200 pub struct BackendConfig {
201 pub codegen_mode: CodegenMode,
205 fn from_opts(opts: &[String]) -> Result<Self, String> {
206 let mut config = BackendConfig::default();
208 if let Some((name, value)) = opt.split_once('=') {
210 "mode" => config.codegen_mode = value.parse()?,
211 _ => return Err(format!("Unknown option `{}`", name)),
214 return Err(format!("Invalid option `{}`", opt));
221 pub struct CraneliftCodegenBackend {
222 pub config: Option<BackendConfig>,
225 impl CodegenBackend for CraneliftCodegenBackend {
226 fn init(&self, sess: &Session) {
227 if sess.lto() != rustc_session::config::Lto::No && sess.opts.cg.embed_bitcode {
228 sess.warn("LTO is not supported. You may get a linker error.");
232 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
233 Box::new(crate::metadata::CraneliftMetadataLoader)
236 fn provide(&self, _providers: &mut Providers) {}
237 fn provide_extern(&self, _providers: &mut Providers) {}
239 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
243 fn codegen_crate<'tcx>(
246 metadata: EncodedMetadata,
247 need_metadata_module: bool,
249 let config = if let Some(config) = self.config {
252 BackendConfig::from_opts(&tcx.sess.opts.cg.llvm_args)
253 .unwrap_or_else(|err| tcx.sess.fatal(&err))
255 let res = driver::codegen_crate(tcx, metadata, need_metadata_module, config);
262 ongoing_codegen: Box<dyn Any>,
264 ) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
266 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
273 codegen_results: CodegenResults,
274 outputs: &OutputFilenames,
275 ) -> Result<(), ErrorReported> {
276 use rustc_codegen_ssa::back::link::link_binary;
278 let target_cpu = crate::target_triple(sess).to_string();
279 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
283 &codegen_results.crate_name.as_str(),
291 fn target_triple(sess: &Session) -> target_lexicon::Triple {
292 sess.target.llvm_target.parse().unwrap()
295 fn build_isa(sess: &Session) -> Box<dyn isa::TargetIsa + 'static> {
296 use target_lexicon::BinaryFormat;
298 let target_triple = crate::target_triple(sess);
300 let mut flags_builder = settings::builder();
301 flags_builder.enable("is_pic").unwrap();
302 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
304 .set("enable_verifier", if cfg!(debug_assertions) { "true" } else { "false" })
307 let tls_model = match target_triple.binary_format {
308 BinaryFormat::Elf => "elf_gd",
309 BinaryFormat::Macho => "macho",
310 BinaryFormat::Coff => "coff",
313 flags_builder.set("tls_model", tls_model).unwrap();
315 flags_builder.set("enable_simd", "true").unwrap();
317 use rustc_session::config::OptLevel;
318 match sess.opts.optimize {
320 flags_builder.set("opt_level", "none").unwrap();
322 OptLevel::Less | OptLevel::Default => {}
323 OptLevel::Aggressive => {
324 flags_builder.set("opt_level", "speed_and_size").unwrap();
326 OptLevel::Size | OptLevel::SizeMin => {
327 sess.warn("Optimizing for size is not supported. Just ignoring the request");
331 let flags = settings::Flags::new(flags_builder);
333 let variant = cranelift_codegen::isa::BackendVariant::MachInst;
334 let mut isa_builder = cranelift_codegen::isa::lookup_variant(target_triple, variant).unwrap();
335 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
336 // is interpreted as `bsr`.
337 isa_builder.enable("nehalem").unwrap();
338 isa_builder.finish(flags)
341 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
343 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
344 Box::new(CraneliftCodegenBackend { config: None })