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_feature;
34 extern crate rustc_index;
35 extern crate rustc_incremental;
36 extern crate rustc_codegen_utils;
37 extern crate rustc_codegen_ssa;
38 extern crate rustc_fs_util;
39 extern crate rustc_driver as _;
41 #[macro_use] extern crate log;
42 extern crate smallvec;
44 extern crate syntax_pos;
45 extern crate rustc_errors as errors;
46 extern crate rustc_session;
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::expand::allocator::AllocatorKind;
55 pub use llvm_util::target_features;
60 use rustc::dep_graph::DepGraph;
61 use rustc::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
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;
90 // The following is a work around that replaces `pub mod llvm;` and that fixes issue 53912.
91 #[path = "llvm/mod.rs"] mod llvm_; pub mod llvm { pub use super::llvm_::*; }
102 pub struct LlvmCodegenBackend(());
104 impl ExtraBackendMethods for LlvmCodegenBackend {
105 fn new_metadata(&self, tcx: TyCtxt<'_>, mod_name: &str) -> ModuleLlvm {
106 ModuleLlvm::new_metadata(tcx, mod_name)
109 fn write_compressed_metadata<'tcx>(
112 metadata: &EncodedMetadata,
113 llvm_module: &mut ModuleLlvm,
115 base::write_compressed_metadata(tcx, metadata, llvm_module)
117 fn codegen_allocator<'tcx>(
120 mods: &mut ModuleLlvm,
123 unsafe { allocator::codegen(tcx, mods, kind) }
125 fn compile_codegen_unit(
126 &self, tcx: TyCtxt<'_>,
128 tx: &std::sync::mpsc::Sender<Box<dyn Any + Send>>,
130 base::compile_codegen_unit(tcx, cgu_name, tx);
132 fn target_machine_factory(
138 Result<&'static mut llvm::TargetMachine, String> + Send + Sync> {
139 back::write::target_machine_factory(sess, optlvl, find_features)
141 fn target_cpu<'b>(&self, sess: &'b Session) -> &'b str {
142 llvm_util::target_cpu(sess)
146 impl WriteBackendMethods for LlvmCodegenBackend {
147 type Module = ModuleLlvm;
148 type ModuleBuffer = back::lto::ModuleBuffer;
149 type Context = llvm::Context;
150 type TargetMachine = &'static mut llvm::TargetMachine;
151 type ThinData = back::lto::ThinData;
152 type ThinBuffer = back::lto::ThinBuffer;
153 fn print_pass_timings(&self) {
154 unsafe { llvm::LLVMRustPrintPassTimings(); }
157 cgcx: &CodegenContext<Self>,
158 modules: Vec<FatLTOInput<Self>>,
159 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
160 ) -> Result<LtoModuleCodegen<Self>, FatalError> {
161 back::lto::run_fat(cgcx, modules, cached_modules)
164 cgcx: &CodegenContext<Self>,
165 modules: Vec<(String, Self::ThinBuffer)>,
166 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
167 ) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
168 back::lto::run_thin(cgcx, modules, cached_modules)
171 cgcx: &CodegenContext<Self>,
172 diag_handler: &Handler,
173 module: &ModuleCodegen<Self::Module>,
174 config: &ModuleConfig,
175 ) -> Result<(), FatalError> {
176 back::write::optimize(cgcx, diag_handler, module, config)
178 unsafe fn optimize_thin(
179 cgcx: &CodegenContext<Self>,
180 thin: &mut ThinModule<Self>,
181 ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
182 back::lto::optimize_thin_module(thin, cgcx)
185 cgcx: &CodegenContext<Self>,
186 diag_handler: &Handler,
187 module: ModuleCodegen<Self::Module>,
188 config: &ModuleConfig,
189 ) -> Result<CompiledModule, FatalError> {
190 back::write::codegen(cgcx, diag_handler, module, config)
193 module: ModuleCodegen<Self::Module>
194 ) -> (String, Self::ThinBuffer) {
195 back::lto::prepare_thin(module)
198 module: ModuleCodegen<Self::Module>
199 ) -> (String, Self::ModuleBuffer) {
200 (module.name, back::lto::ModuleBuffer::new(module.module_llvm.llmod()))
202 fn run_lto_pass_manager(
203 cgcx: &CodegenContext<Self>,
204 module: &ModuleCodegen<Self::Module>,
205 config: &ModuleConfig,
208 back::lto::run_pass_manager(cgcx, module, config, thin)
212 unsafe impl Send for LlvmCodegenBackend {} // Llvm is on a per-thread basis
213 unsafe impl Sync for LlvmCodegenBackend {}
215 impl LlvmCodegenBackend {
216 pub fn new() -> Box<dyn CodegenBackend> {
217 box LlvmCodegenBackend(())
221 impl CodegenBackend for LlvmCodegenBackend {
222 fn init(&self, sess: &Session) {
223 llvm_util::init(sess); // Make sure llvm is inited
226 fn print(&self, req: PrintRequest, sess: &Session) {
228 PrintRequest::RelocationModels => {
229 println!("Available relocation models:");
230 for &(name, _) in back::write::RELOC_MODEL_ARGS.iter() {
231 println!(" {}", name);
235 PrintRequest::CodeModels => {
236 println!("Available code models:");
237 for &(name, _) in back::write::CODE_GEN_MODEL_ARGS.iter(){
238 println!(" {}", name);
242 PrintRequest::TlsModels => {
243 println!("Available TLS models:");
244 for &(name, _) in back::write::TLS_MODEL_ARGS.iter(){
245 println!(" {}", name);
249 req => llvm_util::print(req, sess),
253 fn print_passes(&self) {
254 llvm_util::print_passes();
257 fn print_version(&self) {
258 llvm_util::print_version();
261 fn target_features(&self, sess: &Session) -> Vec<Symbol> {
262 target_features(sess)
265 fn metadata_loader(&self) -> Box<MetadataLoaderDyn> {
266 box metadata::LlvmMetadataLoader
269 fn provide(&self, providers: &mut ty::query::Providers<'_>) {
270 attributes::provide(providers);
273 fn provide_extern(&self, providers: &mut ty::query::Providers<'_>) {
274 attributes::provide_extern(providers);
277 fn codegen_crate<'tcx>(
280 metadata: EncodedMetadata,
281 need_metadata_module: bool,
283 box rustc_codegen_ssa::base::codegen_crate(
284 LlvmCodegenBackend(()), tcx, metadata, need_metadata_module)
287 fn join_codegen_and_link(
289 ongoing_codegen: Box<dyn Any>,
291 dep_graph: &DepGraph,
292 outputs: &OutputFilenames,
293 ) -> Result<(), ErrorReported> {
294 use rustc::util::common::time;
295 let (codegen_results, work_products) =
296 ongoing_codegen.downcast::
297 <rustc_codegen_ssa::back::write::OngoingCodegen<LlvmCodegenBackend>>()
298 .expect("Expected LlvmCodegenBackend's OngoingCodegen, found Box<Any>")
300 if sess.opts.debugging_opts.incremental_info {
301 rustc_codegen_ssa::back::write::dump_incremental_data(&codegen_results);
305 "serialize work products",
306 move || rustc_incremental::save_work_product_index(sess, &dep_graph, work_products));
308 sess.compile_status()?;
310 if !sess.opts.output_types.keys().any(|&i| i == OutputType::Exe ||
311 i == OutputType::Metadata) {
315 // Run the linker on any artifacts that resulted from the LLVM run.
316 // This should produce either a finished executable or library.
317 time(sess, "linking", || {
318 let _prof_timer = sess.prof.generic_activity("link_crate");
320 use rustc_codegen_ssa::back::link::link_binary;
321 use crate::back::archive::LlvmArchiveBuilder;
323 let target_cpu = crate::llvm_util::target_cpu(sess);
324 link_binary::<LlvmArchiveBuilder<'_>>(
328 &codegen_results.crate_name.as_str(),
333 // Now that we won't touch anything in the incremental compilation directory
334 // any more, we can finalize it (which involves renaming it)
335 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
341 /// This is the entrypoint for a hot plugged rustc_codegen_llvm
343 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
344 LlvmCodegenBackend::new()
347 pub struct ModuleLlvm {
348 llcx: &'static mut llvm::Context,
349 llmod_raw: *const llvm::Module,
350 tm: &'static mut llvm::TargetMachine,
353 unsafe impl Send for ModuleLlvm { }
354 unsafe impl Sync for ModuleLlvm { }
357 fn new(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
359 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
360 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
364 tm: create_target_machine(tcx, false),
369 fn new_metadata(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_informational_target_machine(&tcx.sess, false),
382 cgcx: &CodegenContext<LlvmCodegenBackend>,
386 ) -> Result<Self, FatalError> {
388 let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
389 let llmod_raw = back::lto::parse_module(llcx, name, buffer, handler)?;
390 let tm = match (cgcx.tm_factory.0)() {
393 handler.struct_err(&e).emit();
394 return Err(FatalError)
406 fn llmod(&self) -> &llvm::Module {
413 impl Drop for ModuleLlvm {
416 llvm::LLVMContextDispose(&mut *(self.llcx as *mut _));
417 llvm::LLVMRustDisposeTargetMachine(&mut *(self.tm as *mut _));