2020-07-09 09:55:38 -05:00
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use std::path::PathBuf;
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2020-05-09 07:14:45 -05:00
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use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
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2020-03-31 06:20:19 -05:00
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use rustc_middle::middle::cstore::EncodedMetadata;
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use rustc_middle::mir::mono::CodegenUnit;
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2020-03-24 07:09:44 -05:00
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use rustc_session::config::{DebugInfo, OutputType};
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2020-03-12 05:48:17 -05:00
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use rustc_session::cgu_reuse_tracker::CguReuse;
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use rustc_codegen_ssa::back::linker::LinkerInfo;
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2020-06-20 11:44:49 -05:00
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use rustc_codegen_ssa::{CrateInfo, CodegenResults, CompiledModule, ModuleKind};
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2020-03-12 05:58:59 -05:00
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use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
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2020-03-12 05:48:17 -05:00
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use crate::prelude::*;
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2020-07-16 07:58:41 -05:00
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use crate::backend::{AddConstructor, Emit, WriteDebugInfo};
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2020-03-12 05:48:17 -05:00
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2020-03-12 05:58:59 -05:00
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fn new_module(tcx: TyCtxt<'_>, name: String) -> Module<crate::backend::Backend> {
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let module = crate::backend::make_module(tcx.sess, name);
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assert_eq!(pointer_ty(tcx), module.target_config().pointer_type());
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module
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}
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struct ModuleCodegenResult(CompiledModule, Option<(WorkProductId, WorkProduct)>);
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impl<HCX> HashStable<HCX> for ModuleCodegenResult {
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fn hash_stable(&self, _: &mut HCX, _: &mut StableHasher) {
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// do nothing
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}
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}
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fn emit_module<B: Backend>(
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2020-03-12 05:48:17 -05:00
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tcx: TyCtxt<'_>,
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2020-03-12 05:58:59 -05:00
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name: String,
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kind: ModuleKind,
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mut module: Module<B>,
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2020-04-05 06:48:26 -05:00
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debug: Option<DebugContext<'_>>,
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2020-05-01 12:21:29 -05:00
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unwind_context: UnwindContext<'_>,
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2020-07-16 07:58:41 -05:00
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map_product: impl FnOnce(B::Product) -> B::Product,
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2020-03-12 05:58:59 -05:00
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) -> ModuleCodegenResult
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2020-07-16 07:58:41 -05:00
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where B::Product: AddConstructor + Emit + WriteDebugInfo,
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2020-03-12 05:58:59 -05:00
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{
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module.finalize_definitions();
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let mut product = module.finish();
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if let Some(mut debug) = debug {
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debug.emit(&mut product);
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}
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2020-05-01 12:21:29 -05:00
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unwind_context.emit(&mut product);
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2020-07-16 07:58:41 -05:00
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let product = map_product(product);
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2020-03-12 05:58:59 -05:00
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let tmp_file = tcx
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.output_filenames(LOCAL_CRATE)
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.temp_path(OutputType::Object, Some(&name));
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let obj = product.emit();
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2020-08-08 09:14:11 -05:00
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if let Err(err) = std::fs::write(&tmp_file, obj) {
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tcx.sess.fatal(&format!("error writing object file: {}", err));
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}
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2020-03-12 05:48:17 -05:00
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2020-03-12 05:58:59 -05:00
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let work_product = if std::env::var("CG_CLIF_INCR_CACHE_DISABLED").is_ok() {
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None
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} else {
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2020-05-18 04:35:23 -05:00
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rustc_incremental::copy_cgu_workproduct_to_incr_comp_cache_dir(
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2020-03-12 05:58:59 -05:00
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tcx.sess,
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&name,
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2020-05-18 04:35:23 -05:00
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&Some(tmp_file.clone()),
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2020-03-12 05:58:59 -05:00
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)
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2020-03-12 05:48:17 -05:00
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};
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2020-03-12 05:58:59 -05:00
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ModuleCodegenResult(
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CompiledModule {
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name,
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kind,
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object: Some(tmp_file),
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bytecode: None,
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},
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work_product,
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)
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}
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fn reuse_workproduct_for_cgu(
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tcx: TyCtxt<'_>,
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2020-04-05 06:48:26 -05:00
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cgu: &CodegenUnit<'_>,
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2020-03-12 05:58:59 -05:00
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work_products: &mut FxHashMap<WorkProductId, WorkProduct>,
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) -> CompiledModule {
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let incr_comp_session_dir = tcx.sess.incr_comp_session_dir();
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let mut object = None;
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let work_product = cgu.work_product(tcx);
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2020-05-18 04:35:23 -05:00
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if let Some(saved_file) = &work_product.saved_file {
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2020-05-09 07:14:45 -05:00
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let obj_out = tcx.output_filenames(LOCAL_CRATE).temp_path(OutputType::Object, Some(&cgu.name().as_str()));
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object = Some(obj_out.clone());
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2020-03-12 05:58:59 -05:00
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let source_file = rustc_incremental::in_incr_comp_dir(&incr_comp_session_dir, &saved_file);
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if let Err(err) = rustc_fs_util::link_or_copy(&source_file, &obj_out) {
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tcx.sess.err(&format!(
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"unable to copy {} to {}: {}",
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source_file.display(),
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obj_out.display(),
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err
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));
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}
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}
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2020-03-12 05:48:17 -05:00
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2020-03-12 05:58:59 -05:00
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work_products.insert(cgu.work_product_id(), work_product);
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2020-03-12 05:48:17 -05:00
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2020-03-12 05:58:59 -05:00
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CompiledModule {
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name: cgu.name().to_string(),
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kind: ModuleKind::Regular,
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object,
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bytecode: None,
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2020-03-12 05:48:17 -05:00
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}
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2020-03-12 05:58:59 -05:00
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}
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2020-03-12 05:48:17 -05:00
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2020-03-12 05:58:59 -05:00
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fn module_codegen(tcx: TyCtxt<'_>, cgu_name: rustc_span::Symbol) -> ModuleCodegenResult {
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let cgu = tcx.codegen_unit(cgu_name);
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let mono_items = cgu.items_in_deterministic_order(tcx);
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2020-03-12 05:48:17 -05:00
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2020-07-16 07:58:41 -05:00
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let mut module = new_module(tcx, cgu_name.as_str().to_string());
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// Initialize the global atomic mutex using a constructor for proc-macros.
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// FIXME implement atomic instructions in Cranelift.
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let mut init_atomics_mutex_from_constructor = None;
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if tcx.sess.crate_types().contains(&rustc_session::config::CrateType::ProcMacro) {
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if mono_items.iter().any(|(mono_item, _)| {
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match mono_item {
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rustc_middle::mir::mono::MonoItem::Static(def_id) => {
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2020-07-17 12:15:33 -05:00
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tcx.symbol_name(Instance::mono(tcx, *def_id)).name.contains("__rustc_proc_macro_decls_")
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2020-07-16 07:58:41 -05:00
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}
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_ => false,
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}
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}) {
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init_atomics_mutex_from_constructor = Some(crate::atomic_shim::init_global_lock_constructor(&mut module, &format!("{}_init_atomics_mutex", cgu_name.as_str())));
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}
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}
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2020-03-12 05:58:59 -05:00
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2020-06-20 11:44:49 -05:00
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let mut cx = crate::CodegenCx::new(tcx, module, tcx.sess.opts.debuginfo != DebugInfo::None);
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2020-07-09 12:24:53 -05:00
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super::codegen_mono_items(&mut cx, mono_items);
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let (mut module, global_asm, debug, mut unwind_context) = tcx.sess.time("finalize CodegenCx", || cx.finalize());
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2020-06-12 12:31:35 -05:00
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crate::main_shim::maybe_create_entry_wrapper(tcx, &mut module, &mut unwind_context);
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2020-03-12 05:58:59 -05:00
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2020-07-09 09:55:38 -05:00
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let codegen_result = emit_module(
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2020-03-12 05:58:59 -05:00
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tcx,
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cgu.name().as_str().to_string(),
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ModuleKind::Regular,
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module,
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debug,
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2020-05-01 12:21:29 -05:00
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unwind_context,
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2020-07-16 07:58:41 -05:00
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|mut product| {
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if let Some(func_id) = init_atomics_mutex_from_constructor {
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product.add_constructor(func_id);
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}
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product
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}
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2020-07-09 09:55:38 -05:00
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);
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codegen_global_asm(tcx, &cgu.name().as_str(), &global_asm);
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codegen_result
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2020-03-12 05:58:59 -05:00
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}
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pub(super) fn run_aot(
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tcx: TyCtxt<'_>,
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metadata: EncodedMetadata,
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need_metadata_module: bool,
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) -> Box<(CodegenResults, FxHashMap<WorkProductId, WorkProduct>)> {
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let mut work_products = FxHashMap::default();
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2020-03-12 05:48:17 -05:00
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2020-04-18 14:13:09 -05:00
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let cgus = if tcx.sess.opts.output_types.should_codegen() {
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tcx.collect_and_partition_mono_items(LOCAL_CRATE).1
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} else {
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// If only `--emit metadata` is used, we shouldn't perform any codegen.
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// Also `tcx.collect_and_partition_mono_items` may panic in that case.
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&[]
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};
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2020-03-12 05:48:17 -05:00
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if tcx.dep_graph.is_fully_enabled() {
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for cgu in &*cgus {
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2020-05-09 07:14:45 -05:00
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tcx.ensure().codegen_unit(cgu.name());
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2020-03-12 05:48:17 -05:00
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}
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}
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let modules = super::time(tcx, "codegen mono items", || {
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cgus.iter().map(|cgu| {
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let cgu_reuse = determine_cgu_reuse(tcx, cgu);
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tcx.sess.cgu_reuse_tracker.set_actual_reuse(&cgu.name().as_str(), cgu_reuse);
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match cgu_reuse {
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_ if std::env::var("CG_CLIF_INCR_CACHE_DISABLED").is_ok() => {}
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CguReuse::No => {}
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CguReuse::PreLto => {
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2020-03-12 05:58:59 -05:00
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return reuse_workproduct_for_cgu(tcx, &*cgu, &mut work_products);
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2020-03-12 05:48:17 -05:00
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}
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CguReuse::PostLto => unreachable!(),
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}
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let dep_node = cgu.codegen_dep_node(tcx);
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let (ModuleCodegenResult(module, work_product), _) =
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2020-03-31 06:20:19 -05:00
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tcx.dep_graph.with_task(dep_node, tcx, cgu.name(), module_codegen, rustc_middle::dep_graph::hash_result);
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2020-03-12 05:48:17 -05:00
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if let Some((id, product)) = work_product {
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work_products.insert(id, product);
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}
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module
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}).collect::<Vec<_>>()
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});
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tcx.sess.abort_if_errors();
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let mut allocator_module = new_module(tcx, "allocator_shim".to_string());
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2020-06-12 14:15:13 -05:00
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let mut allocator_unwind_context = UnwindContext::new(tcx, allocator_module.isa());
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2020-06-12 12:31:35 -05:00
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let created_alloc_shim = crate::allocator::codegen(
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tcx,
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&mut allocator_module,
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&mut allocator_unwind_context,
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);
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2020-03-12 05:48:17 -05:00
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let allocator_module = if created_alloc_shim {
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let ModuleCodegenResult(module, work_product) = emit_module(
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tcx,
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"allocator_shim".to_string(),
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ModuleKind::Allocator,
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allocator_module,
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None,
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2020-06-12 12:31:35 -05:00
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allocator_unwind_context,
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2020-07-16 07:58:41 -05:00
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|product| product,
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2020-03-12 05:48:17 -05:00
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);
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if let Some((id, product)) = work_product {
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work_products.insert(id, product);
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}
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Some(module)
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} else {
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None
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};
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rustc_incremental::assert_dep_graph(tcx);
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rustc_incremental::save_dep_graph(tcx);
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let metadata_module = if need_metadata_module {
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let _timer = tcx.prof.generic_activity("codegen crate metadata");
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let (metadata_cgu_name, tmp_file) = tcx.sess.time("write compressed metadata", || {
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2020-03-31 06:20:19 -05:00
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use rustc_middle::mir::mono::CodegenUnitNameBuilder;
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2020-03-12 05:48:17 -05:00
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let cgu_name_builder = &mut CodegenUnitNameBuilder::new(tcx);
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let metadata_cgu_name = cgu_name_builder
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.build_cgu_name(LOCAL_CRATE, &["crate"], Some("metadata"))
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.as_str()
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.to_string();
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let tmp_file = tcx
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.output_filenames(LOCAL_CRATE)
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.temp_path(OutputType::Metadata, Some(&metadata_cgu_name));
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let obj = crate::backend::with_object(tcx.sess, &metadata_cgu_name, |object| {
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crate::metadata::write_metadata(tcx, object);
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});
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2020-08-08 09:14:11 -05:00
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if let Err(err) = std::fs::write(&tmp_file, obj) {
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tcx.sess.fatal(&format!("error writing metadata object file: {}", err));
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}
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2020-03-12 05:48:17 -05:00
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(metadata_cgu_name, tmp_file)
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});
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Some(CompiledModule {
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name: metadata_cgu_name,
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kind: ModuleKind::Metadata,
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object: Some(tmp_file),
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bytecode: None,
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})
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} else {
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None
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};
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2020-04-18 14:13:09 -05:00
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if tcx.sess.opts.output_types.should_codegen() {
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rustc_incremental::assert_module_sources::assert_module_sources(tcx);
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}
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2020-03-12 05:48:17 -05:00
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Box::new((CodegenResults {
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crate_name: tcx.crate_name(LOCAL_CRATE),
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modules,
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allocator_module,
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metadata_module,
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crate_hash: tcx.crate_hash(LOCAL_CRATE),
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metadata,
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windows_subsystem: None, // Windows is not yet supported
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linker_info: LinkerInfo::new(tcx),
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crate_info: CrateInfo::new(tcx),
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}, work_products))
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}
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2020-07-09 09:55:38 -05:00
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fn codegen_global_asm(tcx: TyCtxt<'_>, cgu_name: &str, global_asm: &str) {
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use std::io::Write;
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use std::process::{Command, Stdio};
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if global_asm.is_empty() {
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return;
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}
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2020-07-09 11:56:17 -05:00
|
|
|
if tcx.sess.target.target.options.is_like_osx || tcx.sess.target.target.options.is_like_windows {
|
|
|
|
if global_asm.contains("__rust_probestack") {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
// FIXME fix linker error on macOS
|
2020-07-10 07:45:45 -05:00
|
|
|
tcx.sess.fatal("asm! and global_asm! are not yet supported on macOS and Windows");
|
2020-07-09 11:56:17 -05:00
|
|
|
}
|
|
|
|
|
2020-07-09 11:55:46 -05:00
|
|
|
let assembler = crate::toolchain::get_toolchain_binary(tcx.sess, "as");
|
|
|
|
let linker = crate::toolchain::get_toolchain_binary(tcx.sess, "ld");
|
|
|
|
|
2020-07-09 09:55:38 -05:00
|
|
|
// Remove all LLVM style comments
|
|
|
|
let global_asm = global_asm.lines().map(|line| {
|
|
|
|
if let Some(index) = line.find("//") {
|
|
|
|
&line[0..index]
|
|
|
|
} else {
|
|
|
|
line
|
|
|
|
}
|
|
|
|
}).collect::<Vec<_>>().join("\n");
|
|
|
|
|
|
|
|
let output_object_file = tcx
|
|
|
|
.output_filenames(LOCAL_CRATE)
|
|
|
|
.temp_path(OutputType::Object, Some(cgu_name));
|
|
|
|
|
|
|
|
// Assemble `global_asm`
|
|
|
|
let global_asm_object_file = add_file_stem_postfix(output_object_file.clone(), ".asm");
|
2020-07-09 11:55:46 -05:00
|
|
|
let mut child = Command::new(assembler)
|
2020-07-09 09:55:38 -05:00
|
|
|
.arg("-o").arg(&global_asm_object_file)
|
|
|
|
.stdin(Stdio::piped())
|
|
|
|
.spawn()
|
|
|
|
.expect("Failed to spawn `as`.");
|
|
|
|
child.stdin.take().unwrap().write_all(global_asm.as_bytes()).unwrap();
|
|
|
|
let status = child.wait().expect("Failed to wait for `as`.");
|
|
|
|
if !status.success() {
|
|
|
|
tcx.sess.fatal(&format!("Failed to assemble `{}`", global_asm));
|
|
|
|
}
|
|
|
|
|
|
|
|
// Link the global asm and main object file together
|
|
|
|
let main_object_file = add_file_stem_postfix(output_object_file.clone(), ".main");
|
|
|
|
std::fs::rename(&output_object_file, &main_object_file).unwrap();
|
2020-07-09 11:55:46 -05:00
|
|
|
let status = Command::new(linker)
|
2020-07-09 09:55:38 -05:00
|
|
|
.arg("-r") // Create a new object file
|
|
|
|
.arg("-o").arg(output_object_file)
|
|
|
|
.arg(&main_object_file)
|
|
|
|
.arg(&global_asm_object_file)
|
|
|
|
.status()
|
|
|
|
.unwrap();
|
|
|
|
if !status.success() {
|
|
|
|
tcx.sess.fatal(&format!(
|
|
|
|
"Failed to link `{}` and `{}` together",
|
|
|
|
main_object_file.display(),
|
|
|
|
global_asm_object_file.display(),
|
|
|
|
));
|
|
|
|
}
|
|
|
|
|
|
|
|
std::fs::remove_file(global_asm_object_file).unwrap();
|
|
|
|
std::fs::remove_file(main_object_file).unwrap();
|
|
|
|
}
|
|
|
|
|
|
|
|
fn add_file_stem_postfix(mut path: PathBuf, postfix: &str) -> PathBuf {
|
|
|
|
let mut new_filename = path.file_stem().unwrap().to_owned();
|
|
|
|
new_filename.push(postfix);
|
|
|
|
if let Some(extension) = path.extension() {
|
|
|
|
new_filename.push(".");
|
|
|
|
new_filename.push(extension);
|
|
|
|
}
|
|
|
|
path.set_file_name(new_filename);
|
|
|
|
path
|
|
|
|
}
|
|
|
|
|
2020-03-12 05:48:17 -05:00
|
|
|
// Adapted from https://github.com/rust-lang/rust/blob/303d8aff6092709edd4dbd35b1c88e9aa40bf6d8/src/librustc_codegen_ssa/base.rs#L922-L953
|
|
|
|
fn determine_cgu_reuse<'tcx>(tcx: TyCtxt<'tcx>, cgu: &CodegenUnit<'tcx>) -> CguReuse {
|
|
|
|
if !tcx.dep_graph.is_fully_enabled() {
|
|
|
|
return CguReuse::No;
|
|
|
|
}
|
|
|
|
|
|
|
|
let work_product_id = &cgu.work_product_id();
|
|
|
|
if tcx.dep_graph.previous_work_product(work_product_id).is_none() {
|
|
|
|
// We don't have anything cached for this CGU. This can happen
|
|
|
|
// if the CGU did not exist in the previous session.
|
|
|
|
return CguReuse::No;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Try to mark the CGU as green. If it we can do so, it means that nothing
|
|
|
|
// affecting the LLVM module has changed and we can re-use a cached version.
|
|
|
|
// If we compile with any kind of LTO, this means we can re-use the bitcode
|
|
|
|
// of the Pre-LTO stage (possibly also the Post-LTO version but we'll only
|
|
|
|
// know that later). If we are not doing LTO, there is only one optimized
|
|
|
|
// version of each module, so we re-use that.
|
|
|
|
let dep_node = cgu.codegen_dep_node(tcx);
|
|
|
|
assert!(
|
|
|
|
!tcx.dep_graph.dep_node_exists(&dep_node),
|
|
|
|
"CompileCodegenUnit dep-node for CGU `{}` already exists before marking.",
|
|
|
|
cgu.name()
|
|
|
|
);
|
|
|
|
|
|
|
|
if tcx.dep_graph.try_mark_green(tcx, &dep_node).is_some() {
|
|
|
|
CguReuse::PreLto
|
|
|
|
} else {
|
|
|
|
CguReuse::No
|
|
|
|
}
|
|
|
|
}
|