287 lines
9.2 KiB
Rust
287 lines
9.2 KiB
Rust
use rustc::dep_graph::{WorkProduct, WorkProductFileKind, WorkProductId};
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use rustc::middle::cstore::EncodedMetadata;
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use rustc::mir::mono::CodegenUnit;
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use rustc_session::config::{DebugInfo, OutputType};
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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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use rustc_codegen_ssa::CrateInfo;
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use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
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use crate::prelude::*;
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use crate::backend::{Emit, WriteDebugInfo};
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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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tcx: TyCtxt<'_>,
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name: String,
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kind: ModuleKind,
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mut module: Module<B>,
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debug: Option<DebugContext>,
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) -> ModuleCodegenResult
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where B::Product: Emit + WriteDebugInfo,
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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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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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std::fs::write(&tmp_file, obj).unwrap();
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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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rustc_incremental::copy_cgu_workproducts_to_incr_comp_cache_dir(
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tcx.sess,
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&name,
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&[(WorkProductFileKind::Object, tmp_file.clone())],
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)
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};
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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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bytecode_compressed: 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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cgu: &CodegenUnit,
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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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for (kind, saved_file) in &work_product.saved_files {
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let obj_out = match kind {
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WorkProductFileKind::Object => {
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let path = tcx.output_filenames(LOCAL_CRATE).temp_path(OutputType::Object, Some(&cgu.name().as_str()));
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object = Some(path.clone());
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path
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}
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WorkProductFileKind::Bytecode | WorkProductFileKind::BytecodeCompressed => {
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panic!("cg_clif doesn't use bytecode");
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}
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};
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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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work_products.insert(cgu.work_product_id(), work_product);
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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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bytecode_compressed: None,
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}
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}
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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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let mut module = new_module(tcx, cgu_name.as_str().to_string());
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let mut debug = if tcx.sess.opts.debuginfo != DebugInfo::None {
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let debug = DebugContext::new(
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tcx,
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module.target_config().pointer_type().bytes() as u8,
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);
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Some(debug)
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} else {
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None
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};
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super::codegen_mono_items(tcx, &mut module, debug.as_mut(), mono_items);
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crate::main_shim::maybe_create_entry_wrapper(tcx, &mut module);
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emit_module(
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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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)
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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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let (_, cgus) = tcx.collect_and_partition_mono_items(LOCAL_CRATE);
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if tcx.dep_graph.is_fully_enabled() {
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for cgu in &*cgus {
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tcx.codegen_unit(cgu.name());
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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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return reuse_workproduct_for_cgu(tcx, &*cgu, &mut work_products);
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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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tcx.dep_graph.with_task(dep_node, tcx, cgu.name(), module_codegen, rustc::dep_graph::hash_result);
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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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let created_alloc_shim = crate::allocator::codegen(tcx, &mut allocator_module);
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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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);
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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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use rustc::mir::mono::CodegenUnitNameBuilder;
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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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std::fs::write(&tmp_file, obj).unwrap();
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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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bytecode_compressed: None,
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})
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} else {
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None
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};
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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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// Adapted from https://github.com/rust-lang/rust/blob/303d8aff6092709edd4dbd35b1c88e9aa40bf6d8/src/librustc_codegen_ssa/base.rs#L922-L953
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fn determine_cgu_reuse<'tcx>(tcx: TyCtxt<'tcx>, cgu: &CodegenUnit<'tcx>) -> CguReuse {
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if !tcx.dep_graph.is_fully_enabled() {
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return CguReuse::No;
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}
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let work_product_id = &cgu.work_product_id();
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if tcx.dep_graph.previous_work_product(work_product_id).is_none() {
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// We don't have anything cached for this CGU. This can happen
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// if the CGU did not exist in the previous session.
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return CguReuse::No;
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}
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// Try to mark the CGU as green. If it we can do so, it means that nothing
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// affecting the LLVM module has changed and we can re-use a cached version.
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// If we compile with any kind of LTO, this means we can re-use the bitcode
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// of the Pre-LTO stage (possibly also the Post-LTO version but we'll only
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// know that later). If we are not doing LTO, there is only one optimized
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// version of each module, so we re-use that.
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let dep_node = cgu.codegen_dep_node(tcx);
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assert!(
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!tcx.dep_graph.dep_node_exists(&dep_node),
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"CompileCodegenUnit dep-node for CGU `{}` already exists before marking.",
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cgu.name()
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);
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if tcx.dep_graph.try_mark_green(tcx, &dep_node).is_some() {
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CguReuse::PreLto
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} else {
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CguReuse::No
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}
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}
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