5 //! This API is completely unstable and subject to change.
7 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
8 #![feature(bool_to_option)]
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)]
22 #![recursion_limit = "256"]
24 use back::write::{create_informational_target_machine, create_target_machine};
25 use rustc_span::symbol::Symbol;
27 pub use llvm_util::target_features;
28 use rustc::dep_graph::WorkProduct;
29 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
30 use rustc_codegen_ssa::back::write::{CodegenContext, FatLTOInput, ModuleConfig};
31 use rustc_codegen_ssa::traits::*;
32 use rustc_codegen_ssa::CompiledModule;
33 use rustc_errors::{FatalError, Handler};
37 use syntax::expand::allocator::AllocatorKind;
39 use rustc::dep_graph::DepGraph;
40 use rustc::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
41 use rustc::session::config::{OptLevel, OutputFilenames, OutputType, PrintRequest};
42 use rustc::session::Session;
43 use rustc::ty::{self, TyCtxt};
44 use rustc::util::common::ErrorReported;
45 use rustc_codegen_ssa::ModuleCodegen;
46 use rustc_codegen_utils::codegen_backend::CodegenBackend;
69 // The following is a work around that replaces `pub mod llvm;` and that fixes issue 53912.
70 #[path = "llvm/mod.rs"]
73 pub use super::llvm_::*;
85 pub struct LlvmCodegenBackend(());
87 impl ExtraBackendMethods for LlvmCodegenBackend {
88 fn new_metadata(&self, tcx: TyCtxt<'_>, mod_name: &str) -> ModuleLlvm {
89 ModuleLlvm::new_metadata(tcx, mod_name)
92 fn write_compressed_metadata<'tcx>(
95 metadata: &EncodedMetadata,
96 llvm_module: &mut ModuleLlvm,
98 base::write_compressed_metadata(tcx, metadata, llvm_module)
100 fn codegen_allocator<'tcx>(
103 mods: &mut ModuleLlvm,
106 unsafe { allocator::codegen(tcx, mods, kind) }
108 fn compile_codegen_unit(
112 ) -> (ModuleCodegen<ModuleLlvm>, u64) {
113 base::compile_codegen_unit(tcx, cgu_name)
115 fn target_machine_factory(
120 ) -> Arc<dyn Fn() -> Result<&'static mut llvm::TargetMachine, String> + Send + Sync> {
121 back::write::target_machine_factory(sess, optlvl, find_features)
123 fn target_cpu<'b>(&self, sess: &'b Session) -> &'b str {
124 llvm_util::target_cpu(sess)
128 impl WriteBackendMethods for LlvmCodegenBackend {
129 type Module = ModuleLlvm;
130 type ModuleBuffer = back::lto::ModuleBuffer;
131 type Context = llvm::Context;
132 type TargetMachine = &'static mut llvm::TargetMachine;
133 type ThinData = back::lto::ThinData;
134 type ThinBuffer = back::lto::ThinBuffer;
135 fn print_pass_timings(&self) {
137 llvm::LLVMRustPrintPassTimings();
141 cgcx: &CodegenContext<Self>,
142 modules: Vec<FatLTOInput<Self>>,
143 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
144 ) -> Result<LtoModuleCodegen<Self>, FatalError> {
145 back::lto::run_fat(cgcx, modules, cached_modules)
148 cgcx: &CodegenContext<Self>,
149 modules: Vec<(String, Self::ThinBuffer)>,
150 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
151 ) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
152 back::lto::run_thin(cgcx, modules, cached_modules)
155 cgcx: &CodegenContext<Self>,
156 diag_handler: &Handler,
157 module: &ModuleCodegen<Self::Module>,
158 config: &ModuleConfig,
159 ) -> Result<(), FatalError> {
160 back::write::optimize(cgcx, diag_handler, module, config)
162 unsafe fn optimize_thin(
163 cgcx: &CodegenContext<Self>,
164 thin: &mut ThinModule<Self>,
165 ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
166 back::lto::optimize_thin_module(thin, cgcx)
169 cgcx: &CodegenContext<Self>,
170 diag_handler: &Handler,
171 module: ModuleCodegen<Self::Module>,
172 config: &ModuleConfig,
173 ) -> Result<CompiledModule, FatalError> {
174 back::write::codegen(cgcx, diag_handler, module, config)
176 fn prepare_thin(module: ModuleCodegen<Self::Module>) -> (String, Self::ThinBuffer) {
177 back::lto::prepare_thin(module)
179 fn serialize_module(module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer) {
180 (module.name, back::lto::ModuleBuffer::new(module.module_llvm.llmod()))
182 fn run_lto_pass_manager(
183 cgcx: &CodegenContext<Self>,
184 module: &ModuleCodegen<Self::Module>,
185 config: &ModuleConfig,
188 back::lto::run_pass_manager(cgcx, module, config, thin)
192 unsafe impl Send for LlvmCodegenBackend {} // Llvm is on a per-thread basis
193 unsafe impl Sync for LlvmCodegenBackend {}
195 impl LlvmCodegenBackend {
196 pub fn new() -> Box<dyn CodegenBackend> {
197 box LlvmCodegenBackend(())
201 impl CodegenBackend for LlvmCodegenBackend {
202 fn init(&self, sess: &Session) {
203 llvm_util::init(sess); // Make sure llvm is inited
206 fn print(&self, req: PrintRequest, sess: &Session) {
208 PrintRequest::RelocationModels => {
209 println!("Available relocation models:");
210 for &(name, _) in back::write::RELOC_MODEL_ARGS.iter() {
211 println!(" {}", name);
215 PrintRequest::CodeModels => {
216 println!("Available code models:");
217 for &(name, _) in back::write::CODE_GEN_MODEL_ARGS.iter() {
218 println!(" {}", name);
222 PrintRequest::TlsModels => {
223 println!("Available TLS models:");
224 for &(name, _) in back::write::TLS_MODEL_ARGS.iter() {
225 println!(" {}", name);
229 req => llvm_util::print(req, sess),
233 fn print_passes(&self) {
234 llvm_util::print_passes();
237 fn print_version(&self) {
238 llvm_util::print_version();
241 fn target_features(&self, sess: &Session) -> Vec<Symbol> {
242 target_features(sess)
245 fn metadata_loader(&self) -> Box<MetadataLoaderDyn> {
246 box metadata::LlvmMetadataLoader
249 fn provide(&self, providers: &mut ty::query::Providers<'_>) {
250 attributes::provide(providers);
253 fn provide_extern(&self, providers: &mut ty::query::Providers<'_>) {
254 attributes::provide_extern(providers);
257 fn codegen_crate<'tcx>(
260 metadata: EncodedMetadata,
261 need_metadata_module: bool,
263 box rustc_codegen_ssa::base::codegen_crate(
264 LlvmCodegenBackend(()),
267 need_metadata_module,
271 fn join_codegen_and_link(
273 ongoing_codegen: Box<dyn Any>,
275 dep_graph: &DepGraph,
276 outputs: &OutputFilenames,
277 ) -> Result<(), ErrorReported> {
278 let (codegen_results, work_products) = ongoing_codegen
279 .downcast::<rustc_codegen_ssa::back::write::OngoingCodegen<LlvmCodegenBackend>>()
280 .expect("Expected LlvmCodegenBackend's OngoingCodegen, found Box<Any>")
282 if sess.opts.debugging_opts.incremental_info {
283 rustc_codegen_ssa::back::write::dump_incremental_data(&codegen_results);
286 sess.time("serialize_work_products", move || {
287 rustc_incremental::save_work_product_index(sess, &dep_graph, work_products)
290 sess.compile_status()?;
296 .any(|&i| i == OutputType::Exe || i == OutputType::Metadata)
301 // Run the linker on any artifacts that resulted from the LLVM run.
302 // This should produce either a finished executable or library.
303 sess.time("link_crate", || {
304 use crate::back::archive::LlvmArchiveBuilder;
305 use rustc_codegen_ssa::back::link::link_binary;
307 let target_cpu = crate::llvm_util::target_cpu(sess);
308 link_binary::<LlvmArchiveBuilder<'_>>(
312 &codegen_results.crate_name.as_str(),
317 // Now that we won't touch anything in the incremental compilation directory
318 // any more, we can finalize it (which involves renaming it)
319 rustc_incremental::finalize_session_directory(sess, codegen_results.crate_hash);
325 pub struct ModuleLlvm {
326 llcx: &'static mut llvm::Context,
327 llmod_raw: *const llvm::Module,
328 tm: &'static mut llvm::TargetMachine,
331 unsafe impl Send for ModuleLlvm {}
332 unsafe impl Sync for ModuleLlvm {}
335 fn new(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
337 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
338 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
339 ModuleLlvm { llmod_raw, llcx, tm: create_target_machine(tcx, false) }
343 fn new_metadata(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
345 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
346 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
350 tm: create_informational_target_machine(&tcx.sess, false),
356 cgcx: &CodegenContext<LlvmCodegenBackend>,
360 ) -> Result<Self, FatalError> {
362 let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
363 let llmod_raw = back::lto::parse_module(llcx, name, buffer, handler)?;
364 let tm = match (cgcx.tm_factory.0)() {
367 handler.struct_err(&e).emit();
368 return Err(FatalError);
372 Ok(ModuleLlvm { llmod_raw, llcx, tm })
376 fn llmod(&self) -> &llvm::Module {
377 unsafe { &*self.llmod_raw }
381 impl Drop for ModuleLlvm {
384 llvm::LLVMContextDispose(&mut *(self.llcx as *mut _));
385 llvm::LLVMRustDisposeTargetMachine(&mut *(self.tm as *mut _));