5 //! This API is completely unstable and subject to change.
7 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
8 #![feature(bool_to_option)]
9 #![feature(const_cstr_unchecked)]
10 #![feature(crate_visibility_modifier)]
11 #![feature(extended_key_value_attributes)]
12 #![feature(extern_types)]
13 #![feature(in_band_lifetimes)]
16 #![cfg_attr(bootstrap, feature(or_patterns))]
17 #![recursion_limit = "256"]
19 use back::write::{create_informational_target_machine, create_target_machine};
21 pub use llvm_util::target_features;
22 use rustc_ast::expand::allocator::AllocatorKind;
23 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
24 use rustc_codegen_ssa::back::write::{
25 CodegenContext, FatLTOInput, ModuleConfig, TargetMachineFactoryConfig, TargetMachineFactoryFn,
27 use rustc_codegen_ssa::traits::*;
28 use rustc_codegen_ssa::ModuleCodegen;
29 use rustc_codegen_ssa::{CodegenResults, CompiledModule};
30 use rustc_data_structures::fx::FxHashMap;
31 use rustc_errors::{ErrorReported, FatalError, Handler};
32 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
33 use rustc_middle::middle::cstore::{EncodedMetadata, MetadataLoaderDyn};
34 use rustc_middle::ty::{self, TyCtxt};
35 use rustc_session::config::{OptLevel, OutputFilenames, PrintRequest};
36 use rustc_session::Session;
37 use rustc_span::symbol::Symbol;
64 // The following is a work around that replaces `pub mod llvm;` and that fixes issue 53912.
65 #[path = "llvm/mod.rs"]
68 pub use super::llvm_::*;
80 pub struct LlvmCodegenBackend(());
82 impl ExtraBackendMethods for LlvmCodegenBackend {
83 fn new_metadata(&self, tcx: TyCtxt<'_>, mod_name: &str) -> ModuleLlvm {
84 ModuleLlvm::new_metadata(tcx, mod_name)
87 fn write_compressed_metadata<'tcx>(
90 metadata: &EncodedMetadata,
91 llvm_module: &mut ModuleLlvm,
93 base::write_compressed_metadata(tcx, metadata, llvm_module)
95 fn codegen_allocator<'tcx>(
98 mods: &mut ModuleLlvm,
100 has_alloc_error_handler: bool,
102 unsafe { allocator::codegen(tcx, mods, kind, has_alloc_error_handler) }
104 fn compile_codegen_unit(
108 ) -> (ModuleCodegen<ModuleLlvm>, u64) {
109 base::compile_codegen_unit(tcx, cgu_name)
111 fn target_machine_factory(
115 ) -> TargetMachineFactoryFn<Self> {
116 back::write::target_machine_factory(sess, optlvl)
118 fn target_cpu<'b>(&self, sess: &'b Session) -> &'b str {
119 llvm_util::target_cpu(sess)
121 fn tune_cpu<'b>(&self, sess: &'b Session) -> Option<&'b str> {
122 llvm_util::tune_cpu(sess)
126 impl WriteBackendMethods for LlvmCodegenBackend {
127 type Module = ModuleLlvm;
128 type ModuleBuffer = back::lto::ModuleBuffer;
129 type Context = llvm::Context;
130 type TargetMachine = &'static mut llvm::TargetMachine;
131 type ThinData = back::lto::ThinData;
132 type ThinBuffer = back::lto::ThinBuffer;
133 fn print_pass_timings(&self) {
135 llvm::LLVMRustPrintPassTimings();
139 cgcx: &CodegenContext<Self>,
140 diag_handler: &Handler,
141 modules: Vec<ModuleCodegen<Self::Module>>,
142 ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
143 back::write::link(cgcx, diag_handler, modules)
146 cgcx: &CodegenContext<Self>,
147 modules: Vec<FatLTOInput<Self>>,
148 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
149 ) -> Result<LtoModuleCodegen<Self>, FatalError> {
150 back::lto::run_fat(cgcx, modules, cached_modules)
153 cgcx: &CodegenContext<Self>,
154 modules: Vec<(String, Self::ThinBuffer)>,
155 cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
156 ) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
157 back::lto::run_thin(cgcx, modules, cached_modules)
160 cgcx: &CodegenContext<Self>,
161 diag_handler: &Handler,
162 module: &ModuleCodegen<Self::Module>,
163 config: &ModuleConfig,
164 ) -> Result<(), FatalError> {
165 Ok(back::write::optimize(cgcx, diag_handler, module, config))
167 unsafe fn optimize_thin(
168 cgcx: &CodegenContext<Self>,
169 thin: &mut ThinModule<Self>,
170 ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
171 back::lto::optimize_thin_module(thin, cgcx)
174 cgcx: &CodegenContext<Self>,
175 diag_handler: &Handler,
176 module: ModuleCodegen<Self::Module>,
177 config: &ModuleConfig,
178 ) -> Result<CompiledModule, FatalError> {
179 back::write::codegen(cgcx, diag_handler, module, config)
181 fn prepare_thin(module: ModuleCodegen<Self::Module>) -> (String, Self::ThinBuffer) {
182 back::lto::prepare_thin(module)
184 fn serialize_module(module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer) {
185 (module.name, back::lto::ModuleBuffer::new(module.module_llvm.llmod()))
187 fn run_lto_pass_manager(
188 cgcx: &CodegenContext<Self>,
189 module: &ModuleCodegen<Self::Module>,
190 config: &ModuleConfig,
193 back::lto::run_pass_manager(cgcx, module, config, thin)
197 unsafe impl Send for LlvmCodegenBackend {} // Llvm is on a per-thread basis
198 unsafe impl Sync for LlvmCodegenBackend {}
200 impl LlvmCodegenBackend {
201 pub fn new() -> Box<dyn CodegenBackend> {
202 Box::new(LlvmCodegenBackend(()))
206 impl CodegenBackend for LlvmCodegenBackend {
207 fn init(&self, sess: &Session) {
208 llvm_util::init(sess); // Make sure llvm is inited
211 fn print(&self, req: PrintRequest, sess: &Session) {
213 PrintRequest::RelocationModels => {
214 println!("Available relocation models:");
216 &["static", "pic", "dynamic-no-pic", "ropi", "rwpi", "ropi-rwpi", "default"]
218 println!(" {}", name);
222 PrintRequest::CodeModels => {
223 println!("Available code models:");
224 for name in &["tiny", "small", "kernel", "medium", "large"] {
225 println!(" {}", name);
229 PrintRequest::TlsModels => {
230 println!("Available TLS models:");
231 for name in &["global-dynamic", "local-dynamic", "initial-exec", "local-exec"] {
232 println!(" {}", name);
236 req => llvm_util::print(req, sess),
240 fn print_passes(&self) {
241 llvm_util::print_passes();
244 fn print_version(&self) {
245 llvm_util::print_version();
248 fn target_features(&self, sess: &Session) -> Vec<Symbol> {
249 target_features(sess)
252 fn metadata_loader(&self) -> Box<MetadataLoaderDyn> {
253 Box::new(metadata::LlvmMetadataLoader)
256 fn provide(&self, providers: &mut ty::query::Providers) {
257 attributes::provide_both(providers);
260 fn provide_extern(&self, providers: &mut ty::query::Providers) {
261 attributes::provide_both(providers);
264 fn codegen_crate<'tcx>(
267 metadata: EncodedMetadata,
268 need_metadata_module: bool,
270 Box::new(rustc_codegen_ssa::base::codegen_crate(
271 LlvmCodegenBackend(()),
274 need_metadata_module,
280 ongoing_codegen: Box<dyn Any>,
282 ) -> Result<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>), ErrorReported> {
283 let (codegen_results, work_products) = ongoing_codegen
284 .downcast::<rustc_codegen_ssa::back::write::OngoingCodegen<LlvmCodegenBackend>>()
285 .expect("Expected LlvmCodegenBackend's OngoingCodegen, found Box<Any>")
288 sess.time("llvm_dump_timing_file", || {
289 if sess.opts.debugging_opts.llvm_time_trace {
290 llvm_util::time_trace_profiler_finish("llvm_timings.json");
294 Ok((codegen_results, work_products))
300 codegen_results: CodegenResults,
301 outputs: &OutputFilenames,
302 ) -> Result<(), ErrorReported> {
303 use crate::back::archive::LlvmArchiveBuilder;
304 use rustc_codegen_ssa::back::link::link_binary;
306 // Run the linker on any artifacts that resulted from the LLVM run.
307 // This should produce either a finished executable or library.
308 let target_cpu = crate::llvm_util::target_cpu(sess);
309 link_binary::<LlvmArchiveBuilder<'_>>(
313 &codegen_results.crate_name.as_str(),
321 pub struct ModuleLlvm {
322 llcx: &'static mut llvm::Context,
323 llmod_raw: *const llvm::Module,
324 tm: &'static mut llvm::TargetMachine,
327 unsafe impl Send for ModuleLlvm {}
328 unsafe impl Sync for ModuleLlvm {}
331 fn new(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
333 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
334 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
335 ModuleLlvm { llmod_raw, llcx, tm: create_target_machine(tcx, mod_name) }
339 fn new_metadata(tcx: TyCtxt<'_>, mod_name: &str) -> Self {
341 let llcx = llvm::LLVMRustContextCreate(tcx.sess.fewer_names());
342 let llmod_raw = context::create_module(tcx, llcx, mod_name) as *const _;
343 ModuleLlvm { llmod_raw, llcx, tm: create_informational_target_machine(tcx.sess) }
348 cgcx: &CodegenContext<LlvmCodegenBackend>,
352 ) -> Result<Self, FatalError> {
354 let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
355 let llmod_raw = back::lto::parse_module(llcx, name, buffer, handler)?;
356 let tm_factory_config = TargetMachineFactoryConfig::new(&cgcx, name.to_str().unwrap());
357 let tm = match (cgcx.tm_factory)(tm_factory_config) {
360 handler.struct_err(&e).emit();
361 return Err(FatalError);
365 Ok(ModuleLlvm { llmod_raw, llcx, tm })
369 fn llmod(&self) -> &llvm::Module {
370 unsafe { &*self.llmod_raw }
374 impl Drop for ModuleLlvm {
377 llvm::LLVMContextDispose(&mut *(self.llcx as *mut _));
378 llvm::LLVMRustDisposeTargetMachine(&mut *(self.tm as *mut _));