1 #![feature(rustc_private, decl_macro, never_type, hash_drain_filter)]
2 #![warn(rust_2018_idioms)]
3 #![warn(unused_lifetimes)]
4 #![warn(unreachable_pub)]
8 extern crate rustc_middle;
9 extern crate rustc_ast;
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_session;
18 extern crate rustc_span;
19 extern crate rustc_target;
21 // This prevents duplicating functions and statics that are already part of the host rustc process.
22 #[allow(unused_extern_crates)]
23 extern crate rustc_driver;
26 use std::str::FromStr;
28 use rustc_codegen_ssa::traits::CodegenBackend;
29 use rustc_codegen_ssa::CodegenResults;
30 use rustc_errors::ErrorReported;
31 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
32 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoader};
33 use rustc_middle::ty::query::Providers;
34 use rustc_session::config::OutputFilenames;
35 use rustc_session::Session;
37 use cranelift_codegen::settings::{self, Configurable};
39 use crate::constant::ConstantCx;
40 use crate::prelude::*;
51 mod compiler_builtins;
72 pub(crate) use std::convert::{TryFrom, TryInto};
74 pub(crate) use rustc_span::Span;
76 pub(crate) use rustc_hir::def_id::{DefId, LOCAL_CRATE};
77 pub(crate) use rustc_middle::bug;
78 pub(crate) use rustc_middle::mir::{self, *};
79 pub(crate) use rustc_middle::ty::layout::{self, TyAndLayout};
80 pub(crate) use rustc_middle::ty::{
81 self, FloatTy, Instance, InstanceDef, IntTy, ParamEnv, Ty, TyCtxt, TypeAndMut,
84 pub(crate) use rustc_target::abi::{Abi, LayoutOf, Scalar, Size, VariantIdx};
86 pub(crate) use rustc_data_structures::fx::FxHashMap;
88 pub(crate) use rustc_index::vec::Idx;
90 pub(crate) use cranelift_codegen::entity::EntitySet;
91 pub(crate) use cranelift_codegen::ir::condcodes::{FloatCC, IntCC};
92 pub(crate) use cranelift_codegen::ir::function::Function;
93 pub(crate) use cranelift_codegen::ir::types;
94 pub(crate) use cranelift_codegen::ir::{
95 AbiParam, Block, ExternalName, FuncRef, Inst, InstBuilder, MemFlags, Signature, SourceLoc,
96 StackSlot, StackSlotData, StackSlotKind, TrapCode, Type, Value,
98 pub(crate) use cranelift_codegen::isa::{self, CallConv};
99 pub(crate) use cranelift_codegen::Context;
100 pub(crate) use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext, Variable};
101 pub(crate) use cranelift_module::{self, DataContext, DataId, FuncId, Linkage, Module};
103 pub(crate) use crate::abi::*;
104 pub(crate) use crate::base::{codegen_operand, codegen_place};
105 pub(crate) use crate::cast::*;
106 pub(crate) use crate::common::*;
107 pub(crate) use crate::debuginfo::{DebugContext, UnwindContext};
108 pub(crate) use crate::pointer::Pointer;
109 pub(crate) use crate::trap::*;
110 pub(crate) use crate::value_and_place::{CPlace, CPlaceInner, CValue};
113 struct PrintOnPanic<F: Fn() -> String>(F);
114 impl<F: Fn() -> String> Drop for PrintOnPanic<F> {
116 if ::std::thread::panicking() {
117 println!("{}", (self.0)());
122 struct CodegenCx<'m, 'tcx: 'm> {
124 module: &'m mut dyn Module,
126 constants_cx: ConstantCx,
127 cached_context: Context,
128 vtables: FxHashMap<(Ty<'tcx>, Option<ty::PolyExistentialTraitRef<'tcx>>), DataId>,
129 debug_context: Option<DebugContext<'tcx>>,
130 unwind_context: UnwindContext<'tcx>,
133 impl<'m, 'tcx> CodegenCx<'m, 'tcx> {
136 backend_config: BackendConfig,
137 module: &'m mut dyn Module,
140 let unwind_context = UnwindContext::new(
143 matches!(backend_config.codegen_mode, CodegenMode::Aot),
146 if debug_info { Some(DebugContext::new(tcx, module.isa())) } else { None };
150 global_asm: String::new(),
151 constants_cx: ConstantCx::default(),
152 cached_context: Context::new(),
153 vtables: FxHashMap::default(),
159 fn finalize(self) -> (String, Option<DebugContext<'tcx>>, UnwindContext<'tcx>) {
160 self.constants_cx.finalize(self.tcx, self.module);
161 (self.global_asm, self.debug_context, self.unwind_context)
165 #[derive(Copy, Clone, Debug)]
166 pub enum CodegenMode {
172 impl Default for CodegenMode {
173 fn default() -> Self {
178 impl FromStr for CodegenMode {
181 fn from_str(s: &str) -> Result<Self, Self::Err> {
183 "aot" => Ok(CodegenMode::Aot),
184 "jit" => Ok(CodegenMode::Jit),
185 "jit-lazy" => Ok(CodegenMode::JitLazy),
186 _ => Err(format!("Unknown codegen mode `{}`", s)),
191 #[derive(Copy, Clone, Debug, Default)]
192 pub struct BackendConfig {
193 pub codegen_mode: CodegenMode,
197 fn from_opts(opts: &[String]) -> Result<Self, String> {
198 let mut config = BackendConfig::default();
200 if let Some((name, value)) = opt.split_once('=') {
202 "mode" => config.codegen_mode = value.parse()?,
203 _ => return Err(format!("Unknown option `{}`", name)),
206 return Err(format!("Invalid option `{}`", opt));
213 pub struct CraneliftCodegenBackend {
214 pub config: Option<BackendConfig>,
217 impl CodegenBackend for CraneliftCodegenBackend {
218 fn init(&self, sess: &Session) {
219 use rustc_session::config::Lto;
221 Lto::No | Lto::ThinLocal => {}
222 Lto::Thin | Lto::Fat => sess.warn("LTO is not supported. You may get a linker error."),
226 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
227 Box::new(crate::metadata::CraneliftMetadataLoader)
230 fn provide(&self, _providers: &mut Providers) {}
231 fn provide_extern(&self, _providers: &mut Providers) {}
233 fn target_features(&self, _sess: &Session) -> Vec<rustc_span::Symbol> {
240 metadata: EncodedMetadata,
241 need_metadata_module: bool,
243 let config = if let Some(config) = self.config {
246 BackendConfig::from_opts(&tcx.sess.opts.cg.llvm_args)
247 .unwrap_or_else(|err| tcx.sess.fatal(&err))
249 driver::codegen_crate(tcx, metadata, need_metadata_module, config)
254 ongoing_codegen: Box<dyn Any>,
256 ) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
258 .downcast::<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)>()
265 codegen_results: CodegenResults,
266 outputs: &OutputFilenames,
267 ) -> Result<(), ErrorReported> {
268 use rustc_codegen_ssa::back::link::link_binary;
270 link_binary::<crate::archive::ArArchiveBuilder<'_>>(
274 &codegen_results.crate_name.as_str(),
281 fn target_triple(sess: &Session) -> target_lexicon::Triple {
282 sess.target.llvm_target.parse().unwrap()
285 fn build_isa(sess: &Session) -> Box<dyn isa::TargetIsa + 'static> {
286 use target_lexicon::BinaryFormat;
288 let target_triple = crate::target_triple(sess);
290 let mut flags_builder = settings::builder();
291 flags_builder.enable("is_pic").unwrap();
292 flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
293 let enable_verifier =
294 cfg!(debug_assertions) || std::env::var("CG_CLIF_ENABLE_VERIFIER").is_ok();
295 flags_builder.set("enable_verifier", if enable_verifier { "true" } else { "false" }).unwrap();
297 let tls_model = match target_triple.binary_format {
298 BinaryFormat::Elf => "elf_gd",
299 BinaryFormat::Macho => "macho",
300 BinaryFormat::Coff => "coff",
303 flags_builder.set("tls_model", tls_model).unwrap();
305 flags_builder.set("enable_simd", "true").unwrap();
307 flags_builder.set("enable_llvm_abi_extensions", "true").unwrap();
309 use rustc_session::config::OptLevel;
310 match sess.opts.optimize {
312 flags_builder.set("opt_level", "none").unwrap();
314 OptLevel::Less | OptLevel::Default => {}
315 OptLevel::Size | OptLevel::SizeMin | OptLevel::Aggressive => {
316 flags_builder.set("opt_level", "speed_and_size").unwrap();
320 let flags = settings::Flags::new(flags_builder);
322 let variant = cranelift_codegen::isa::BackendVariant::MachInst;
323 let mut isa_builder = cranelift_codegen::isa::lookup_variant(target_triple, variant).unwrap();
324 // Don't use "haswell", as it implies `has_lzcnt`.macOS CI is still at Ivy Bridge EP, so `lzcnt`
325 // is interpreted as `bsr`.
326 isa_builder.enable("nehalem").unwrap();
327 isa_builder.finish(flags)
330 /// This is the entrypoint for a hot plugged rustc_codegen_cranelift
332 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
333 Box::new(CraneliftCodegenBackend { config: None })