5 //! This API is completely unstable and subject to change.
7 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
9 #![feature(box_patterns)]
10 #![feature(box_syntax)]
11 #![feature(const_cstr_unchecked)]
12 #![feature(crate_visibility_modifier)]
13 #![feature(custom_attribute)]
14 #![feature(extern_types)]
15 #![feature(in_band_lifetimes)]
16 #![allow(unused_attributes)]
19 #![feature(rustc_diagnostic_macros)]
20 #![feature(optin_builtin_traits)]
21 #![feature(concat_idents)]
22 #![feature(link_args)]
23 #![feature(static_nobundle)]
24 #![feature(trusted_len)]
25 #![deny(rust_2018_idioms)]
26 #![allow(explicit_outlives_requirements)]
28 use back::write::{create_target_machine, create_informational_target_machine};
29 use syntax_pos::symbol::Symbol;
32 #[macro_use] extern crate bitflags;
34 #[macro_use] extern crate rustc;
35 extern crate rustc_allocator;
36 extern crate rustc_target;
37 #[macro_use] extern crate rustc_data_structures;
38 extern crate rustc_incremental;
39 extern crate rustc_codegen_utils;
40 extern crate rustc_codegen_ssa;
41 extern crate rustc_fs_util;
43 #[macro_use] extern crate log;
44 #[macro_use] extern crate syntax;
45 extern crate syntax_pos;
46 extern crate rustc_errors as errors;
48 use rustc_codegen_ssa::traits::*;
49 use rustc_codegen_ssa::back::write::{CodegenContext, ModuleConfig, FatLTOInput};
50 use rustc_codegen_ssa::back::lto::{SerializedModule, LtoModuleCodegen, ThinModule};
51 use rustc_codegen_ssa::CompiledModule;
52 use errors::{FatalError, Handler};
53 use rustc::dep_graph::WorkProduct;
54 use syntax_pos::symbol::InternedString;
55 pub use llvm_util::target_features;
57 use std::sync::{mpsc, Arc};
59 use rustc::dep_graph::DepGraph;
60 use rustc::middle::allocator::AllocatorKind;
61 use rustc::middle::cstore::{EncodedMetadata, MetadataLoader};
62 use rustc::session::Session;
63 use rustc::session::config::{OutputFilenames, OutputType, PrintRequest, OptLevel};
64 use rustc::ty::{self, TyCtxt};
65 use rustc::util::common::ErrorReported;
66 use rustc_codegen_ssa::ModuleCodegen;
67 use rustc_codegen_utils::codegen_backend::CodegenBackend;
92 // The following is a work around that replaces `pub mod llvm;` and that fixes issue 53912.
93 #[path = "llvm/mod.rs"] mod llvm_; pub mod llvm { pub use super::llvm_::*; }
104 pub struct LlvmCodegenBackend(());
106 impl ExtraBackendMethods for LlvmCodegenBackend {
107 fn new_metadata(&self, tcx: TyCtxt<'_, '_, '_>, mod_name: &str) -> ModuleLlvm {
108 ModuleLlvm::new_metadata(tcx, mod_name)
111 fn write_compressed_metadata<'b, 'gcx>(
113 tcx: TyCtxt<'b, 'gcx, 'gcx>,
114 metadata: &EncodedMetadata,
115 llvm_module: &mut ModuleLlvm
117 base::write_compressed_metadata(tcx, metadata, llvm_module)
119 fn codegen_allocator<'b, 'gcx>(
121 tcx: TyCtxt<'b, 'gcx, 'gcx>,
122 mods: &mut ModuleLlvm,
125 unsafe { allocator::codegen(tcx, mods, kind) }
127 fn compile_codegen_unit<'a, 'tcx: 'a>(
129 tcx: TyCtxt<'a, 'tcx, 'tcx>,
130 cgu_name: InternedString,
132 base::compile_codegen_unit(tcx, cgu_name);
134 fn target_machine_factory(
140 Result<&'static mut llvm::TargetMachine, String> + Send + Sync> {
141 back::write::target_machine_factory(sess, optlvl, find_features)
143 fn target_cpu<'b>(&self, sess: &'b Session) -> &'b str {
144 llvm_util::target_cpu(sess)
148 impl WriteBackendMethods for LlvmCodegenBackend {
149 type Module = ModuleLlvm;
150 type ModuleBuffer = back::lto::ModuleBuffer;
151 type Context = llvm::Context;
152 type TargetMachine = &'static mut llvm::TargetMachine;
153 type ThinData = back::lto::ThinData;
154 type ThinBuffer = back::lto::ThinBuffer;
155 fn print_pass_timings(&self) {
156 unsafe { llvm::LLVMRustPrintPassTimings(); }
159 cgcx: &CodegenContext<Self>,
160 modules: Vec<FatLTOInput<Self>>,
161 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
162 ) -> Result<LtoModuleCodegen<Self>, FatalError> {
163 back::lto::run_fat(cgcx, modules, cached_modules)
166 cgcx: &CodegenContext<Self>,
167 modules: Vec<(String, Self::ThinBuffer)>,
168 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
169 ) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
170 back::lto::run_thin(cgcx, modules, cached_modules)
173 cgcx: &CodegenContext<Self>,
174 diag_handler: &Handler,
175 module: &ModuleCodegen<Self::Module>,
176 config: &ModuleConfig,
177 ) -> Result<(), FatalError> {
178 back::write::optimize(cgcx, diag_handler, module, config)
180 unsafe fn optimize_thin(
181 cgcx: &CodegenContext<Self>,
182 thin: &mut ThinModule<Self>,
183 ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
184 back::lto::optimize_thin_module(thin, cgcx)
187 cgcx: &CodegenContext<Self>,
188 diag_handler: &Handler,
189 module: ModuleCodegen<Self::Module>,
190 config: &ModuleConfig,
191 ) -> Result<CompiledModule, FatalError> {
192 back::write::codegen(cgcx, diag_handler, module, config)
195 module: ModuleCodegen<Self::Module>
196 ) -> (String, Self::ThinBuffer) {
197 back::lto::prepare_thin(module)
200 module: ModuleCodegen<Self::Module>
201 ) -> (String, Self::ModuleBuffer) {
202 (module.name, back::lto::ModuleBuffer::new(module.module_llvm.llmod()))
204 fn run_lto_pass_manager(
205 cgcx: &CodegenContext<Self>,
206 module: &ModuleCodegen<Self::Module>,
207 config: &ModuleConfig,
210 back::lto::run_pass_manager(cgcx, module, config, thin)
214 unsafe impl Send for LlvmCodegenBackend {} // Llvm is on a per-thread basis
215 unsafe impl Sync for LlvmCodegenBackend {}
217 impl LlvmCodegenBackend {
218 pub fn new() -> Box<dyn CodegenBackend> {
219 box LlvmCodegenBackend(())
223 impl CodegenBackend for LlvmCodegenBackend {
224 fn init(&self, sess: &Session) {
225 llvm_util::init(sess); // Make sure llvm is inited
228 fn print(&self, req: PrintRequest, sess: &Session) {
230 PrintRequest::RelocationModels => {
231 println!("Available relocation models:");
232 for &(name, _) in back::write::RELOC_MODEL_ARGS.iter() {
233 println!(" {}", name);
237 PrintRequest::CodeModels => {
238 println!("Available code models:");
239 for &(name, _) in back::write::CODE_GEN_MODEL_ARGS.iter(){
240 println!(" {}", name);
244 PrintRequest::TlsModels => {
245 println!("Available TLS models:");
246 for &(name, _) in back::write::TLS_MODEL_ARGS.iter(){
247 println!(" {}", name);
251 req => llvm_util::print(req, sess),
255 fn print_passes(&self) {
256 llvm_util::print_passes();
259 fn print_version(&self) {
260 llvm_util::print_version();
263 fn diagnostics(&self) -> &[(&'static str, &'static str)] {
267 fn target_features(&self, sess: &Session) -> Vec<Symbol> {
268 target_features(sess)
271 fn metadata_loader(&self) -> Box<dyn MetadataLoader + Sync> {
272 box metadata::LlvmMetadataLoader
275 fn provide(&self, providers: &mut ty::query::Providers<'_>) {
276 rustc_codegen_utils::symbol_names::provide(providers);
277 rustc_codegen_ssa::back::symbol_export::provide(providers);
278 rustc_codegen_ssa::base::provide_both(providers);
279 attributes::provide(providers);
282 fn provide_extern(&self, providers: &mut ty::query::Providers<'_>) {
283 rustc_codegen_ssa::back::symbol_export::provide_extern(providers);
284 rustc_codegen_ssa::base::provide_both(providers);
285 attributes::provide_extern(providers);
288 fn codegen_crate<'b, 'tcx>(
290 tcx: TyCtxt<'b, 'tcx, 'tcx>,
291 metadata: EncodedMetadata,
292 need_metadata_module: bool,
293 rx: mpsc::Receiver<Box<dyn Any + Send>>
295 box rustc_codegen_ssa::base::codegen_crate(
296 LlvmCodegenBackend(()), tcx, metadata, need_metadata_module, rx)
299 fn join_codegen_and_link(
301 ongoing_codegen: Box<dyn Any>,
303 dep_graph: &DepGraph,
304 outputs: &OutputFilenames,
305 ) -> Result<(), ErrorReported> {
306 use rustc::util::common::time;
307 let (codegen_results, work_products) =
308 ongoing_codegen.downcast::
309 <rustc_codegen_ssa::back::write::OngoingCodegen<LlvmCodegenBackend>>()
310 .expect("Expected LlvmCodegenBackend's OngoingCodegen, found Box<Any>")
312 if sess.opts.debugging_opts.incremental_info {
313 rustc_codegen_ssa::back::write::dump_incremental_data(&codegen_results);
317 "serialize work products",
318 move || rustc_incremental::save_work_product_index(sess, &dep_graph, work_products));
320 sess.compile_status()?;
322 if !sess.opts.output_types.keys().any(|&i| i == OutputType::Exe ||
323 i == OutputType::Metadata) {
327 // Run the linker on any artifacts that resulted from the LLVM run.
328 // This should produce either a finished executable or library.
329 sess.profiler(|p| p.start_activity("link_crate"));
330 time(sess, "linking", || {
331 use rustc_codegen_ssa::back::link::link_binary;
332 use crate::back::archive::LlvmArchiveBuilder;
334 let target_cpu = crate::llvm_util::target_cpu(sess);
335 link_binary::<LlvmArchiveBuilder<'_>>(
339 &codegen_results.crate_name.as_str(),
343 sess.profiler(|p| p.end_activity("link_crate"));
345 // Now that we won't touch anything in the incremental compilation directory
346 // any more, we can finalize it (which involves renaming it)
347 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
353 /// This is the entrypoint for a hot plugged rustc_codegen_llvm
355 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
356 LlvmCodegenBackend::new()
359 pub struct ModuleLlvm {
360 llcx: &'static mut llvm::Context,
361 llmod_raw: *const llvm::Module,
362 tm: &'static mut llvm::TargetMachine,
365 unsafe impl Send for ModuleLlvm { }
366 unsafe impl Sync for ModuleLlvm { }
369 fn new(tcx: TyCtxt<'_, '_, '_>, mod_name: &str) -> Self {
371 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
372 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
376 tm: create_target_machine(tcx, false),
381 fn new_metadata(tcx: TyCtxt<'_, '_, '_>, mod_name: &str) -> Self {
383 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
384 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
388 tm: create_informational_target_machine(&tcx.sess, false),
394 cgcx: &CodegenContext<LlvmCodegenBackend>,
396 buffer: &back::lto::ModuleBuffer,
398 ) -> Result<Self, FatalError> {
400 let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
401 let llmod_raw = buffer.parse(name, llcx, handler)?;
402 let tm = match (cgcx.tm_factory.0)() {
405 handler.struct_err(&e).emit();
406 return Err(FatalError)
418 fn llmod(&self) -> &llvm::Module {
425 impl Drop for ModuleLlvm {
428 llvm::LLVMContextDispose(&mut *(self.llcx as *mut _));
429 llvm::LLVMRustDisposeTargetMachine(&mut *(self.tm as *mut _));
434 __build_diagnostic_array! { librustc_codegen_llvm, DIAGNOSTICS }