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(extern_types)]
14 #![feature(in_band_lifetimes)]
17 #![feature(optin_builtin_traits)]
18 #![feature(concat_idents)]
19 #![feature(link_args)]
20 #![feature(static_nobundle)]
21 #![feature(trusted_len)]
23 use back::write::{create_target_machine, create_informational_target_machine};
24 use syntax_pos::symbol::Symbol;
26 extern crate rustc_demangle;
28 #[macro_use] extern crate bitflags;
30 #[macro_use] extern crate rustc;
31 extern crate rustc_target;
32 #[macro_use] extern crate rustc_data_structures;
33 extern crate rustc_index;
34 extern crate rustc_incremental;
35 extern crate rustc_codegen_utils;
36 extern crate rustc_codegen_ssa;
37 extern crate rustc_fs_util;
38 extern crate rustc_driver as _;
40 #[macro_use] extern crate log;
42 extern crate syntax_pos;
43 extern crate rustc_errors as errors;
45 use rustc_codegen_ssa::traits::*;
46 use rustc_codegen_ssa::back::write::{CodegenContext, ModuleConfig, FatLTOInput};
47 use rustc_codegen_ssa::back::lto::{SerializedModule, LtoModuleCodegen, ThinModule};
48 use rustc_codegen_ssa::CompiledModule;
49 use errors::{FatalError, Handler};
50 use rustc::dep_graph::WorkProduct;
51 use syntax::expand::allocator::AllocatorKind;
52 pub use llvm_util::target_features;
57 use rustc::dep_graph::DepGraph;
58 use rustc::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
59 use rustc::session::Session;
60 use rustc::session::config::{OutputFilenames, OutputType, PrintRequest, OptLevel};
61 use rustc::ty::{self, TyCtxt};
62 use rustc::util::common::ErrorReported;
63 use rustc_codegen_ssa::ModuleCodegen;
64 use rustc_codegen_utils::codegen_backend::CodegenBackend;
87 // The following is a work around that replaces `pub mod llvm;` and that fixes issue 53912.
88 #[path = "llvm/mod.rs"] mod llvm_; pub mod llvm { pub use super::llvm_::*; }
99 pub struct LlvmCodegenBackend(());
101 impl ExtraBackendMethods for LlvmCodegenBackend {
102 fn new_metadata(&self, tcx: TyCtxt<'_>, mod_name: &str) -> ModuleLlvm {
103 ModuleLlvm::new_metadata(tcx, mod_name)
106 fn write_compressed_metadata<'tcx>(
109 metadata: &EncodedMetadata,
110 llvm_module: &mut ModuleLlvm,
112 base::write_compressed_metadata(tcx, metadata, llvm_module)
114 fn codegen_allocator<'tcx>(
117 mods: &mut ModuleLlvm,
120 unsafe { allocator::codegen(tcx, mods, kind) }
122 fn compile_codegen_unit(
123 &self, tcx: TyCtxt<'_>,
125 tx: &std::sync::mpsc::Sender<Box<dyn Any + Send>>,
127 base::compile_codegen_unit(tcx, cgu_name, tx);
129 fn target_machine_factory(
135 Result<&'static mut llvm::TargetMachine, String> + Send + Sync> {
136 back::write::target_machine_factory(sess, optlvl, find_features)
138 fn target_cpu<'b>(&self, sess: &'b Session) -> &'b str {
139 llvm_util::target_cpu(sess)
143 impl WriteBackendMethods for LlvmCodegenBackend {
144 type Module = ModuleLlvm;
145 type ModuleBuffer = back::lto::ModuleBuffer;
146 type Context = llvm::Context;
147 type TargetMachine = &'static mut llvm::TargetMachine;
148 type ThinData = back::lto::ThinData;
149 type ThinBuffer = back::lto::ThinBuffer;
150 fn print_pass_timings(&self) {
151 unsafe { llvm::LLVMRustPrintPassTimings(); }
154 cgcx: &CodegenContext<Self>,
155 modules: Vec<FatLTOInput<Self>>,
156 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
157 ) -> Result<LtoModuleCodegen<Self>, FatalError> {
158 back::lto::run_fat(cgcx, modules, cached_modules)
161 cgcx: &CodegenContext<Self>,
162 modules: Vec<(String, Self::ThinBuffer)>,
163 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
164 ) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
165 back::lto::run_thin(cgcx, modules, cached_modules)
168 cgcx: &CodegenContext<Self>,
169 diag_handler: &Handler,
170 module: &ModuleCodegen<Self::Module>,
171 config: &ModuleConfig,
172 ) -> Result<(), FatalError> {
173 back::write::optimize(cgcx, diag_handler, module, config)
175 unsafe fn optimize_thin(
176 cgcx: &CodegenContext<Self>,
177 thin: &mut ThinModule<Self>,
178 ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
179 back::lto::optimize_thin_module(thin, cgcx)
182 cgcx: &CodegenContext<Self>,
183 diag_handler: &Handler,
184 module: ModuleCodegen<Self::Module>,
185 config: &ModuleConfig,
186 ) -> Result<CompiledModule, FatalError> {
187 back::write::codegen(cgcx, diag_handler, module, config)
190 module: ModuleCodegen<Self::Module>
191 ) -> (String, Self::ThinBuffer) {
192 back::lto::prepare_thin(module)
195 module: ModuleCodegen<Self::Module>
196 ) -> (String, Self::ModuleBuffer) {
197 (module.name, back::lto::ModuleBuffer::new(module.module_llvm.llmod()))
199 fn run_lto_pass_manager(
200 cgcx: &CodegenContext<Self>,
201 module: &ModuleCodegen<Self::Module>,
202 config: &ModuleConfig,
205 back::lto::run_pass_manager(cgcx, module, config, thin)
209 unsafe impl Send for LlvmCodegenBackend {} // Llvm is on a per-thread basis
210 unsafe impl Sync for LlvmCodegenBackend {}
212 impl LlvmCodegenBackend {
213 pub fn new() -> Box<dyn CodegenBackend> {
214 box LlvmCodegenBackend(())
218 impl CodegenBackend for LlvmCodegenBackend {
219 fn init(&self, sess: &Session) {
220 llvm_util::init(sess); // Make sure llvm is inited
223 fn print(&self, req: PrintRequest, sess: &Session) {
225 PrintRequest::RelocationModels => {
226 println!("Available relocation models:");
227 for &(name, _) in back::write::RELOC_MODEL_ARGS.iter() {
228 println!(" {}", name);
232 PrintRequest::CodeModels => {
233 println!("Available code models:");
234 for &(name, _) in back::write::CODE_GEN_MODEL_ARGS.iter(){
235 println!(" {}", name);
239 PrintRequest::TlsModels => {
240 println!("Available TLS models:");
241 for &(name, _) in back::write::TLS_MODEL_ARGS.iter(){
242 println!(" {}", name);
246 req => llvm_util::print(req, sess),
250 fn print_passes(&self) {
251 llvm_util::print_passes();
254 fn print_version(&self) {
255 llvm_util::print_version();
258 fn target_features(&self, sess: &Session) -> Vec<Symbol> {
259 target_features(sess)
262 fn metadata_loader(&self) -> Box<MetadataLoaderDyn> {
263 box metadata::LlvmMetadataLoader
266 fn provide(&self, providers: &mut ty::query::Providers<'_>) {
267 attributes::provide(providers);
270 fn provide_extern(&self, providers: &mut ty::query::Providers<'_>) {
271 attributes::provide_extern(providers);
274 fn codegen_crate<'tcx>(
277 metadata: EncodedMetadata,
278 need_metadata_module: bool,
280 box rustc_codegen_ssa::base::codegen_crate(
281 LlvmCodegenBackend(()), tcx, metadata, need_metadata_module)
284 fn join_codegen_and_link(
286 ongoing_codegen: Box<dyn Any>,
288 dep_graph: &DepGraph,
289 outputs: &OutputFilenames,
290 ) -> Result<(), ErrorReported> {
291 use rustc::util::common::time;
292 let (codegen_results, work_products) =
293 ongoing_codegen.downcast::
294 <rustc_codegen_ssa::back::write::OngoingCodegen<LlvmCodegenBackend>>()
295 .expect("Expected LlvmCodegenBackend's OngoingCodegen, found Box<Any>")
297 if sess.opts.debugging_opts.incremental_info {
298 rustc_codegen_ssa::back::write::dump_incremental_data(&codegen_results);
302 "serialize work products",
303 move || rustc_incremental::save_work_product_index(sess, &dep_graph, work_products));
305 sess.compile_status()?;
307 if !sess.opts.output_types.keys().any(|&i| i == OutputType::Exe ||
308 i == OutputType::Metadata) {
312 // Run the linker on any artifacts that resulted from the LLVM run.
313 // This should produce either a finished executable or library.
314 time(sess, "linking", || {
315 let _prof_timer = sess.prof.generic_activity("link_crate");
317 use rustc_codegen_ssa::back::link::link_binary;
318 use crate::back::archive::LlvmArchiveBuilder;
320 let target_cpu = crate::llvm_util::target_cpu(sess);
321 link_binary::<LlvmArchiveBuilder<'_>>(
325 &codegen_results.crate_name.as_str(),
330 // Now that we won't touch anything in the incremental compilation directory
331 // any more, we can finalize it (which involves renaming it)
332 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
338 /// This is the entrypoint for a hot plugged rustc_codegen_llvm
340 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
341 LlvmCodegenBackend::new()
344 pub struct ModuleLlvm {
345 llcx: &'static mut llvm::Context,
346 llmod_raw: *const llvm::Module,
347 tm: &'static mut llvm::TargetMachine,
350 unsafe impl Send for ModuleLlvm { }
351 unsafe impl Sync for ModuleLlvm { }
354 fn new(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
356 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
357 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
361 tm: create_target_machine(tcx, false),
366 fn new_metadata(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
368 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
369 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
373 tm: create_informational_target_machine(&tcx.sess, false),
379 cgcx: &CodegenContext<LlvmCodegenBackend>,
383 ) -> Result<Self, FatalError> {
385 let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
386 let llmod_raw = back::lto::parse_module(llcx, name, buffer, handler)?;
387 let tm = match (cgcx.tm_factory.0)() {
390 handler.struct_err(&e).emit();
391 return Err(FatalError)
403 fn llmod(&self) -> &llvm::Module {
410 impl Drop for ModuleLlvm {
413 llvm::LLVMContextDispose(&mut *(self.llcx as *mut _));
414 llvm::LLVMRustDisposeTargetMachine(&mut *(self.tm as *mut _));