1 use std::path::PathBuf;
3 use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
4 use rustc_middle::middle::cstore::EncodedMetadata;
5 use rustc_middle::mir::mono::CodegenUnit;
6 use rustc_session::config::{DebugInfo, OutputType};
7 use rustc_session::cgu_reuse_tracker::CguReuse;
8 use rustc_codegen_ssa::back::linker::LinkerInfo;
9 use rustc_codegen_ssa::{CrateInfo, CodegenResults, CompiledModule, ModuleKind};
10 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
12 use crate::prelude::*;
14 use crate::backend::{AddConstructor, Emit, WriteDebugInfo};
16 fn new_module(tcx: TyCtxt<'_>, name: String) -> Module<crate::backend::Backend> {
17 let module = crate::backend::make_module(tcx.sess, name);
18 assert_eq!(pointer_ty(tcx), module.target_config().pointer_type());
22 struct ModuleCodegenResult(CompiledModule, Option<(WorkProductId, WorkProduct)>);
25 impl<HCX> HashStable<HCX> for ModuleCodegenResult {
26 fn hash_stable(&self, _: &mut HCX, _: &mut StableHasher) {
31 fn emit_module<B: Backend>(
35 mut module: Module<B>,
36 debug: Option<DebugContext<'_>>,
37 unwind_context: UnwindContext<'_>,
38 map_product: impl FnOnce(B::Product) -> B::Product,
39 ) -> ModuleCodegenResult
40 where B::Product: AddConstructor + Emit + WriteDebugInfo,
42 module.finalize_definitions();
43 let mut product = module.finish();
45 if let Some(mut debug) = debug {
46 debug.emit(&mut product);
49 unwind_context.emit(&mut product);
51 let product = map_product(product);
54 .output_filenames(LOCAL_CRATE)
55 .temp_path(OutputType::Object, Some(&name));
56 let obj = product.emit();
57 std::fs::write(&tmp_file, obj).unwrap();
59 let work_product = if std::env::var("CG_CLIF_INCR_CACHE_DISABLED").is_ok() {
62 rustc_incremental::copy_cgu_workproduct_to_incr_comp_cache_dir(
65 &Some(tmp_file.clone()),
73 object: Some(tmp_file),
80 fn reuse_workproduct_for_cgu(
82 cgu: &CodegenUnit<'_>,
83 work_products: &mut FxHashMap<WorkProductId, WorkProduct>,
85 let incr_comp_session_dir = tcx.sess.incr_comp_session_dir();
86 let mut object = None;
87 let work_product = cgu.work_product(tcx);
88 if let Some(saved_file) = &work_product.saved_file {
89 let obj_out = tcx.output_filenames(LOCAL_CRATE).temp_path(OutputType::Object, Some(&cgu.name().as_str()));
90 object = Some(obj_out.clone());
91 let source_file = rustc_incremental::in_incr_comp_dir(&incr_comp_session_dir, &saved_file);
92 if let Err(err) = rustc_fs_util::link_or_copy(&source_file, &obj_out) {
93 tcx.sess.err(&format!(
94 "unable to copy {} to {}: {}",
95 source_file.display(),
102 work_products.insert(cgu.work_product_id(), work_product);
105 name: cgu.name().to_string(),
106 kind: ModuleKind::Regular,
112 fn module_codegen(tcx: TyCtxt<'_>, cgu_name: rustc_span::Symbol) -> ModuleCodegenResult {
113 let cgu = tcx.codegen_unit(cgu_name);
114 let mono_items = cgu.items_in_deterministic_order(tcx);
116 let mut module = new_module(tcx, cgu_name.as_str().to_string());
118 // Initialize the global atomic mutex using a constructor for proc-macros.
119 // FIXME implement atomic instructions in Cranelift.
120 let mut init_atomics_mutex_from_constructor = None;
121 if tcx.sess.crate_types().contains(&rustc_session::config::CrateType::ProcMacro) {
122 if mono_items.iter().any(|(mono_item, _)| {
124 rustc_middle::mir::mono::MonoItem::Static(def_id) => {
125 tcx.symbol_name(Instance::mono(tcx, *def_id)).name.as_str().contains("__rustc_proc_macro_decls_")
130 init_atomics_mutex_from_constructor = Some(crate::atomic_shim::init_global_lock_constructor(&mut module, &format!("{}_init_atomics_mutex", cgu_name.as_str())));
134 let mut cx = crate::CodegenCx::new(tcx, module, tcx.sess.opts.debuginfo != DebugInfo::None);
135 super::codegen_mono_items(&mut cx, mono_items);
136 let (mut module, global_asm, debug, mut unwind_context) = tcx.sess.time("finalize CodegenCx", || cx.finalize());
137 crate::main_shim::maybe_create_entry_wrapper(tcx, &mut module, &mut unwind_context);
139 let codegen_result = emit_module(
141 cgu.name().as_str().to_string(),
147 if let Some(func_id) = init_atomics_mutex_from_constructor {
148 product.add_constructor(func_id);
155 codegen_global_asm(tcx, &cgu.name().as_str(), &global_asm);
160 pub(super) fn run_aot(
162 metadata: EncodedMetadata,
163 need_metadata_module: bool,
164 ) -> Box<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)> {
165 let mut work_products = FxHashMap::default();
167 let cgus = if tcx.sess.opts.output_types.should_codegen() {
168 tcx.collect_and_partition_mono_items(LOCAL_CRATE).1
170 // If only `--emit metadata` is used, we shouldn't perform any codegen.
171 // Also `tcx.collect_and_partition_mono_items` may panic in that case.
175 if tcx.dep_graph.is_fully_enabled() {
177 tcx.ensure().codegen_unit(cgu.name());
181 let modules = super::time(tcx, "codegen mono items", || {
182 cgus.iter().map(|cgu| {
183 let cgu_reuse = determine_cgu_reuse(tcx, cgu);
184 tcx.sess.cgu_reuse_tracker.set_actual_reuse(&cgu.name().as_str(), cgu_reuse);
187 _ if std::env::var("CG_CLIF_INCR_CACHE_DISABLED").is_ok() => {}
189 CguReuse::PreLto => {
190 return reuse_workproduct_for_cgu(tcx, &*cgu, &mut work_products);
192 CguReuse::PostLto => unreachable!(),
195 let dep_node = cgu.codegen_dep_node(tcx);
196 let (ModuleCodegenResult(module, work_product), _) =
197 tcx.dep_graph.with_task(dep_node, tcx, cgu.name(), module_codegen, rustc_middle::dep_graph::hash_result);
199 if let Some((id, product)) = work_product {
200 work_products.insert(id, product);
204 }).collect::<Vec<_>>()
207 tcx.sess.abort_if_errors();
209 let mut allocator_module = new_module(tcx, "allocator_shim".to_string());
210 let mut allocator_unwind_context = UnwindContext::new(tcx, allocator_module.isa());
211 let created_alloc_shim = crate::allocator::codegen(
213 &mut allocator_module,
214 &mut allocator_unwind_context,
217 let allocator_module = if created_alloc_shim {
218 let ModuleCodegenResult(module, work_product) = emit_module(
220 "allocator_shim".to_string(),
221 ModuleKind::Allocator,
224 allocator_unwind_context,
227 if let Some((id, product)) = work_product {
228 work_products.insert(id, product);
235 rustc_incremental::assert_dep_graph(tcx);
236 rustc_incremental::save_dep_graph(tcx);
238 let metadata_module = if need_metadata_module {
239 let _timer = tcx.prof.generic_activity("codegen crate metadata");
240 let (metadata_cgu_name, tmp_file) = tcx.sess.time("write compressed metadata", || {
241 use rustc_middle::mir::mono::CodegenUnitNameBuilder;
243 let cgu_name_builder = &mut CodegenUnitNameBuilder::new(tcx);
244 let metadata_cgu_name = cgu_name_builder
245 .build_cgu_name(LOCAL_CRATE, &["crate"], Some("metadata"))
250 .output_filenames(LOCAL_CRATE)
251 .temp_path(OutputType::Metadata, Some(&metadata_cgu_name));
253 let obj = crate::backend::with_object(tcx.sess, &metadata_cgu_name, |object| {
254 crate::metadata::write_metadata(tcx, object);
257 std::fs::write(&tmp_file, obj).unwrap();
259 (metadata_cgu_name, tmp_file)
262 Some(CompiledModule {
263 name: metadata_cgu_name,
264 kind: ModuleKind::Metadata,
265 object: Some(tmp_file),
272 if tcx.sess.opts.output_types.should_codegen() {
273 rustc_incremental::assert_module_sources::assert_module_sources(tcx);
276 Box::new((CodegenResults {
277 crate_name: tcx.crate_name(LOCAL_CRATE),
281 crate_hash: tcx.crate_hash(LOCAL_CRATE),
283 windows_subsystem: None, // Windows is not yet supported
284 linker_info: LinkerInfo::new(tcx),
285 crate_info: CrateInfo::new(tcx),
289 fn codegen_global_asm(tcx: TyCtxt<'_>, cgu_name: &str, global_asm: &str) {
291 use std::process::{Command, Stdio};
293 if global_asm.is_empty() {
297 if tcx.sess.target.target.options.is_like_osx || tcx.sess.target.target.options.is_like_windows {
298 if global_asm.contains("__rust_probestack") {
302 // FIXME fix linker error on macOS
303 tcx.sess.fatal("asm! and global_asm! are not yet supported on macOS and Windows");
306 let assembler = crate::toolchain::get_toolchain_binary(tcx.sess, "as");
307 let linker = crate::toolchain::get_toolchain_binary(tcx.sess, "ld");
309 // Remove all LLVM style comments
310 let global_asm = global_asm.lines().map(|line| {
311 if let Some(index) = line.find("//") {
316 }).collect::<Vec<_>>().join("\n");
318 let output_object_file = tcx
319 .output_filenames(LOCAL_CRATE)
320 .temp_path(OutputType::Object, Some(cgu_name));
322 // Assemble `global_asm`
323 let global_asm_object_file = add_file_stem_postfix(output_object_file.clone(), ".asm");
324 let mut child = Command::new(assembler)
325 .arg("-o").arg(&global_asm_object_file)
326 .stdin(Stdio::piped())
328 .expect("Failed to spawn `as`.");
329 child.stdin.take().unwrap().write_all(global_asm.as_bytes()).unwrap();
330 let status = child.wait().expect("Failed to wait for `as`.");
331 if !status.success() {
332 tcx.sess.fatal(&format!("Failed to assemble `{}`", global_asm));
335 // Link the global asm and main object file together
336 let main_object_file = add_file_stem_postfix(output_object_file.clone(), ".main");
337 std::fs::rename(&output_object_file, &main_object_file).unwrap();
338 let status = Command::new(linker)
339 .arg("-r") // Create a new object file
340 .arg("-o").arg(output_object_file)
341 .arg(&main_object_file)
342 .arg(&global_asm_object_file)
345 if !status.success() {
346 tcx.sess.fatal(&format!(
347 "Failed to link `{}` and `{}` together",
348 main_object_file.display(),
349 global_asm_object_file.display(),
353 std::fs::remove_file(global_asm_object_file).unwrap();
354 std::fs::remove_file(main_object_file).unwrap();
357 fn add_file_stem_postfix(mut path: PathBuf, postfix: &str) -> PathBuf {
358 let mut new_filename = path.file_stem().unwrap().to_owned();
359 new_filename.push(postfix);
360 if let Some(extension) = path.extension() {
361 new_filename.push(".");
362 new_filename.push(extension);
364 path.set_file_name(new_filename);
368 // Adapted from https://github.com/rust-lang/rust/blob/303d8aff6092709edd4dbd35b1c88e9aa40bf6d8/src/librustc_codegen_ssa/base.rs#L922-L953
369 fn determine_cgu_reuse<'tcx>(tcx: TyCtxt<'tcx>, cgu: &CodegenUnit<'tcx>) -> CguReuse {
370 if !tcx.dep_graph.is_fully_enabled() {
374 let work_product_id = &cgu.work_product_id();
375 if tcx.dep_graph.previous_work_product(work_product_id).is_none() {
376 // We don't have anything cached for this CGU. This can happen
377 // if the CGU did not exist in the previous session.
381 // Try to mark the CGU as green. If it we can do so, it means that nothing
382 // affecting the LLVM module has changed and we can re-use a cached version.
383 // If we compile with any kind of LTO, this means we can re-use the bitcode
384 // of the Pre-LTO stage (possibly also the Post-LTO version but we'll only
385 // know that later). If we are not doing LTO, there is only one optimized
386 // version of each module, so we re-use that.
387 let dep_node = cgu.codegen_dep_node(tcx);
389 !tcx.dep_graph.dep_node_exists(&dep_node),
390 "CompileCodegenUnit dep-node for CGU `{}` already exists before marking.",
394 if tcx.dep_graph.try_mark_green(tcx, &dep_node).is_some() {