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 if let Err(err) = std::fs::write(&tmp_file, obj) {
58 tcx.sess.fatal(&format!("error writing object file: {}", err));
61 let work_product = if std::env::var("CG_CLIF_INCR_CACHE_DISABLED").is_ok() {
64 rustc_incremental::copy_cgu_workproduct_to_incr_comp_cache_dir(
67 &Some(tmp_file.clone()),
75 object: Some(tmp_file),
82 fn reuse_workproduct_for_cgu(
84 cgu: &CodegenUnit<'_>,
85 work_products: &mut FxHashMap<WorkProductId, WorkProduct>,
87 let incr_comp_session_dir = tcx.sess.incr_comp_session_dir();
88 let mut object = None;
89 let work_product = cgu.work_product(tcx);
90 if let Some(saved_file) = &work_product.saved_file {
91 let obj_out = tcx.output_filenames(LOCAL_CRATE).temp_path(OutputType::Object, Some(&cgu.name().as_str()));
92 object = Some(obj_out.clone());
93 let source_file = rustc_incremental::in_incr_comp_dir(&incr_comp_session_dir, &saved_file);
94 if let Err(err) = rustc_fs_util::link_or_copy(&source_file, &obj_out) {
95 tcx.sess.err(&format!(
96 "unable to copy {} to {}: {}",
97 source_file.display(),
104 work_products.insert(cgu.work_product_id(), work_product);
107 name: cgu.name().to_string(),
108 kind: ModuleKind::Regular,
114 fn module_codegen(tcx: TyCtxt<'_>, cgu_name: rustc_span::Symbol) -> ModuleCodegenResult {
115 let cgu = tcx.codegen_unit(cgu_name);
116 let mono_items = cgu.items_in_deterministic_order(tcx);
118 let mut module = new_module(tcx, cgu_name.as_str().to_string());
120 // Initialize the global atomic mutex using a constructor for proc-macros.
121 // FIXME implement atomic instructions in Cranelift.
122 let mut init_atomics_mutex_from_constructor = None;
123 if tcx.sess.crate_types().contains(&rustc_session::config::CrateType::ProcMacro) {
124 if mono_items.iter().any(|(mono_item, _)| {
126 rustc_middle::mir::mono::MonoItem::Static(def_id) => {
127 tcx.symbol_name(Instance::mono(tcx, *def_id)).name.contains("__rustc_proc_macro_decls_")
132 init_atomics_mutex_from_constructor = Some(crate::atomic_shim::init_global_lock_constructor(&mut module, &format!("{}_init_atomics_mutex", cgu_name.as_str())));
136 let mut cx = crate::CodegenCx::new(tcx, module, tcx.sess.opts.debuginfo != DebugInfo::None);
137 super::codegen_mono_items(&mut cx, mono_items);
138 let (mut module, global_asm, debug, mut unwind_context) = tcx.sess.time("finalize CodegenCx", || cx.finalize());
139 crate::main_shim::maybe_create_entry_wrapper(tcx, &mut module, &mut unwind_context);
141 let codegen_result = emit_module(
143 cgu.name().as_str().to_string(),
149 if let Some(func_id) = init_atomics_mutex_from_constructor {
150 product.add_constructor(func_id);
157 codegen_global_asm(tcx, &cgu.name().as_str(), &global_asm);
162 pub(super) fn run_aot(
164 metadata: EncodedMetadata,
165 need_metadata_module: bool,
166 ) -> Box<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)> {
167 let mut work_products = FxHashMap::default();
169 let cgus = if tcx.sess.opts.output_types.should_codegen() {
170 tcx.collect_and_partition_mono_items(LOCAL_CRATE).1
172 // If only `--emit metadata` is used, we shouldn't perform any codegen.
173 // Also `tcx.collect_and_partition_mono_items` may panic in that case.
177 if tcx.dep_graph.is_fully_enabled() {
179 tcx.ensure().codegen_unit(cgu.name());
183 let modules = super::time(tcx, "codegen mono items", || {
184 cgus.iter().map(|cgu| {
185 let cgu_reuse = determine_cgu_reuse(tcx, cgu);
186 tcx.sess.cgu_reuse_tracker.set_actual_reuse(&cgu.name().as_str(), cgu_reuse);
189 _ if std::env::var("CG_CLIF_INCR_CACHE_DISABLED").is_ok() => {}
191 CguReuse::PreLto => {
192 return reuse_workproduct_for_cgu(tcx, &*cgu, &mut work_products);
194 CguReuse::PostLto => unreachable!(),
197 let dep_node = cgu.codegen_dep_node(tcx);
198 let (ModuleCodegenResult(module, work_product), _) =
199 tcx.dep_graph.with_task(dep_node, tcx, cgu.name(), module_codegen, rustc_middle::dep_graph::hash_result);
201 if let Some((id, product)) = work_product {
202 work_products.insert(id, product);
206 }).collect::<Vec<_>>()
209 tcx.sess.abort_if_errors();
211 let mut allocator_module = new_module(tcx, "allocator_shim".to_string());
212 let mut allocator_unwind_context = UnwindContext::new(tcx, allocator_module.isa());
213 let created_alloc_shim = crate::allocator::codegen(
215 &mut allocator_module,
216 &mut allocator_unwind_context,
219 let allocator_module = if created_alloc_shim {
220 let ModuleCodegenResult(module, work_product) = emit_module(
222 "allocator_shim".to_string(),
223 ModuleKind::Allocator,
226 allocator_unwind_context,
229 if let Some((id, product)) = work_product {
230 work_products.insert(id, product);
237 rustc_incremental::assert_dep_graph(tcx);
238 rustc_incremental::save_dep_graph(tcx);
240 let metadata_module = if need_metadata_module {
241 let _timer = tcx.prof.generic_activity("codegen crate metadata");
242 let (metadata_cgu_name, tmp_file) = tcx.sess.time("write compressed metadata", || {
243 use rustc_middle::mir::mono::CodegenUnitNameBuilder;
245 let cgu_name_builder = &mut CodegenUnitNameBuilder::new(tcx);
246 let metadata_cgu_name = cgu_name_builder
247 .build_cgu_name(LOCAL_CRATE, &["crate"], Some("metadata"))
252 .output_filenames(LOCAL_CRATE)
253 .temp_path(OutputType::Metadata, Some(&metadata_cgu_name));
255 let obj = crate::backend::with_object(tcx.sess, &metadata_cgu_name, |object| {
256 crate::metadata::write_metadata(tcx, object);
259 if let Err(err) = std::fs::write(&tmp_file, obj) {
260 tcx.sess.fatal(&format!("error writing metadata object file: {}", err));
263 (metadata_cgu_name, tmp_file)
266 Some(CompiledModule {
267 name: metadata_cgu_name,
268 kind: ModuleKind::Metadata,
269 object: Some(tmp_file),
276 if tcx.sess.opts.output_types.should_codegen() {
277 rustc_incremental::assert_module_sources::assert_module_sources(tcx);
280 Box::new((CodegenResults {
281 crate_name: tcx.crate_name(LOCAL_CRATE),
285 crate_hash: tcx.crate_hash(LOCAL_CRATE),
287 windows_subsystem: None, // Windows is not yet supported
288 linker_info: LinkerInfo::new(tcx),
289 crate_info: CrateInfo::new(tcx),
293 fn codegen_global_asm(tcx: TyCtxt<'_>, cgu_name: &str, global_asm: &str) {
295 use std::process::{Command, Stdio};
297 if global_asm.is_empty() {
301 if cfg!(not(feature = "inline_asm"))
302 || tcx.sess.target.target.options.is_like_osx
303 || tcx.sess.target.target.options.is_like_windows
305 if global_asm.contains("__rust_probestack") {
309 // FIXME fix linker error on macOS
310 if cfg!(not(feature = "inline_asm")) {
311 tcx.sess.fatal("asm! and global_asm! support is disabled while compiling rustc_codegen_cranelift");
313 tcx.sess.fatal("asm! and global_asm! are not yet supported on macOS and Windows");
317 let assembler = crate::toolchain::get_toolchain_binary(tcx.sess, "as");
318 let linker = crate::toolchain::get_toolchain_binary(tcx.sess, "ld");
320 // Remove all LLVM style comments
321 let global_asm = global_asm.lines().map(|line| {
322 if let Some(index) = line.find("//") {
327 }).collect::<Vec<_>>().join("\n");
329 let output_object_file = tcx
330 .output_filenames(LOCAL_CRATE)
331 .temp_path(OutputType::Object, Some(cgu_name));
333 // Assemble `global_asm`
334 let global_asm_object_file = add_file_stem_postfix(output_object_file.clone(), ".asm");
335 let mut child = Command::new(assembler)
336 .arg("-o").arg(&global_asm_object_file)
337 .stdin(Stdio::piped())
339 .expect("Failed to spawn `as`.");
340 child.stdin.take().unwrap().write_all(global_asm.as_bytes()).unwrap();
341 let status = child.wait().expect("Failed to wait for `as`.");
342 if !status.success() {
343 tcx.sess.fatal(&format!("Failed to assemble `{}`", global_asm));
346 // Link the global asm and main object file together
347 let main_object_file = add_file_stem_postfix(output_object_file.clone(), ".main");
348 std::fs::rename(&output_object_file, &main_object_file).unwrap();
349 let status = Command::new(linker)
350 .arg("-r") // Create a new object file
351 .arg("-o").arg(output_object_file)
352 .arg(&main_object_file)
353 .arg(&global_asm_object_file)
356 if !status.success() {
357 tcx.sess.fatal(&format!(
358 "Failed to link `{}` and `{}` together",
359 main_object_file.display(),
360 global_asm_object_file.display(),
364 std::fs::remove_file(global_asm_object_file).unwrap();
365 std::fs::remove_file(main_object_file).unwrap();
368 fn add_file_stem_postfix(mut path: PathBuf, postfix: &str) -> PathBuf {
369 let mut new_filename = path.file_stem().unwrap().to_owned();
370 new_filename.push(postfix);
371 if let Some(extension) = path.extension() {
372 new_filename.push(".");
373 new_filename.push(extension);
375 path.set_file_name(new_filename);
379 // Adapted from https://github.com/rust-lang/rust/blob/303d8aff6092709edd4dbd35b1c88e9aa40bf6d8/src/librustc_codegen_ssa/base.rs#L922-L953
380 fn determine_cgu_reuse<'tcx>(tcx: TyCtxt<'tcx>, cgu: &CodegenUnit<'tcx>) -> CguReuse {
381 if !tcx.dep_graph.is_fully_enabled() {
385 let work_product_id = &cgu.work_product_id();
386 if tcx.dep_graph.previous_work_product(work_product_id).is_none() {
387 // We don't have anything cached for this CGU. This can happen
388 // if the CGU did not exist in the previous session.
392 // Try to mark the CGU as green. If it we can do so, it means that nothing
393 // affecting the LLVM module has changed and we can re-use a cached version.
394 // If we compile with any kind of LTO, this means we can re-use the bitcode
395 // of the Pre-LTO stage (possibly also the Post-LTO version but we'll only
396 // know that later). If we are not doing LTO, there is only one optimized
397 // version of each module, so we re-use that.
398 let dep_node = cgu.codegen_dep_node(tcx);
400 !tcx.dep_graph.dep_node_exists(&dep_node),
401 "CompileCodegenUnit dep-node for CGU `{}` already exists before marking.",
405 if tcx.dep_graph.try_mark_green(tcx, &dep_node).is_some() {