1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
2 #![feature(assert_matches)]
3 #![feature(bool_to_option)]
4 #![feature(box_patterns)]
5 #![feature(drain_filter)]
6 #![feature(try_blocks)]
7 #![feature(in_band_lifetimes)]
9 #![cfg_attr(bootstrap, feature(or_patterns))]
10 #![feature(associated_type_bounds)]
12 #![recursion_limit = "256"]
13 #![feature(box_syntax)]
15 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
16 //! The backend-agnostic functions of this crate use functions defined in various traits that
17 //! have to be implemented by each backends.
20 extern crate rustc_macros;
24 extern crate rustc_middle;
27 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
28 use rustc_data_structures::sync::Lrc;
29 use rustc_hir::def_id::CrateNum;
30 use rustc_hir::LangItem;
31 use rustc_middle::dep_graph::WorkProduct;
32 use rustc_middle::middle::cstore::{self, CrateSource, LibSource};
33 use rustc_middle::middle::dependency_format::Dependencies;
34 use rustc_middle::ty::query::Providers;
35 use rustc_session::config::{OutputFilenames, OutputType, RUST_CGU_EXT};
36 use rustc_session::utils::NativeLibKind;
37 use rustc_span::symbol::Symbol;
38 use std::path::{Path, PathBuf};
49 pub mod target_features;
52 pub struct ModuleCodegen<M> {
53 /// The name of the module. When the crate may be saved between
54 /// compilations, incremental compilation requires that name be
55 /// unique amongst **all** crates. Therefore, it should contain
56 /// something unique to this crate (e.g., a module path) as well
57 /// as the crate name and disambiguator.
58 /// We currently generate these names via CodegenUnit::build_cgu_name().
64 // FIXME(eddyb) maybe include the crate name in this?
65 pub const METADATA_FILENAME: &str = "lib.rmeta";
67 impl<M> ModuleCodegen<M> {
68 pub fn into_compiled_module(
73 outputs: &OutputFilenames,
75 let object = emit_obj.then(|| outputs.temp_path(OutputType::Object, Some(&self.name)));
76 let dwarf_object = emit_dwarf_obj.then(|| outputs.temp_path_dwo(Some(&self.name)));
77 let bytecode = emit_bc.then(|| outputs.temp_path(OutputType::Bitcode, Some(&self.name)));
79 CompiledModule { name: self.name.clone(), kind: self.kind, object, dwarf_object, bytecode }
83 #[derive(Debug, Encodable, Decodable)]
84 pub struct CompiledModule {
87 pub object: Option<PathBuf>,
88 pub dwarf_object: Option<PathBuf>,
89 pub bytecode: Option<PathBuf>,
92 pub struct CachedModuleCodegen {
94 pub source: WorkProduct,
97 #[derive(Copy, Clone, Debug, PartialEq, Encodable, Decodable)]
104 bitflags::bitflags! {
105 pub struct MemFlags: u8 {
106 const VOLATILE = 1 << 0;
107 const NONTEMPORAL = 1 << 1;
108 const UNALIGNED = 1 << 2;
112 #[derive(Clone, Debug, Encodable, Decodable, HashStable)]
113 pub struct NativeLib {
114 pub kind: NativeLibKind,
115 pub name: Option<Symbol>,
116 pub cfg: Option<ast::MetaItem>,
119 impl From<&cstore::NativeLib> for NativeLib {
120 fn from(lib: &cstore::NativeLib) -> Self {
121 NativeLib { kind: lib.kind, name: lib.name, cfg: lib.cfg.clone() }
125 /// Misc info we load from metadata to persist beyond the tcx.
127 /// Note: though `CrateNum` is only meaningful within the same tcx, information within `CrateInfo`
128 /// is self-contained. `CrateNum` can be viewed as a unique identifier within a `CrateInfo`, where
129 /// `used_crate_source` contains all `CrateSource` of the dependents, and maintains a mapping from
130 /// identifiers (`CrateNum`) to `CrateSource`. The other fields map `CrateNum` to the crate's own
131 /// additional properties, so that effectively we can retrieve each dependent crate's `CrateSource`
132 /// and the corresponding properties without referencing information outside of a `CrateInfo`.
133 #[derive(Debug, Encodable, Decodable)]
134 pub struct CrateInfo {
135 pub panic_runtime: Option<CrateNum>,
136 pub compiler_builtins: Option<CrateNum>,
137 pub profiler_runtime: Option<CrateNum>,
138 pub is_no_builtins: FxHashSet<CrateNum>,
139 pub native_libraries: FxHashMap<CrateNum, Vec<NativeLib>>,
140 pub crate_name: FxHashMap<CrateNum, String>,
141 pub used_libraries: Vec<NativeLib>,
142 pub link_args: Lrc<Vec<String>>,
143 pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>,
144 pub used_crates_static: Vec<(CrateNum, LibSource)>,
145 pub used_crates_dynamic: Vec<(CrateNum, LibSource)>,
146 pub lang_item_to_crate: FxHashMap<LangItem, CrateNum>,
147 pub missing_lang_items: FxHashMap<CrateNum, Vec<LangItem>>,
148 pub dependency_formats: Lrc<Dependencies>,
151 #[derive(Encodable, Decodable)]
152 pub struct CodegenResults {
153 pub crate_name: Symbol,
154 pub modules: Vec<CompiledModule>,
155 pub allocator_module: Option<CompiledModule>,
156 pub metadata_module: Option<CompiledModule>,
157 pub metadata: rustc_middle::middle::cstore::EncodedMetadata,
158 pub windows_subsystem: Option<String>,
159 pub linker_info: back::linker::LinkerInfo,
160 pub crate_info: CrateInfo,
163 pub fn provide(providers: &mut Providers) {
164 crate::back::symbol_export::provide(providers);
165 crate::base::provide(providers);
166 crate::target_features::provide(providers);
169 pub fn provide_extern(providers: &mut Providers) {
170 crate::back::symbol_export::provide_extern(providers);
173 /// Checks if the given filename ends with the `.rcgu.o` extension that `rustc`
174 /// uses for the object files it generates.
175 pub fn looks_like_rust_object_file(filename: &str) -> bool {
176 let path = Path::new(filename);
177 let ext = path.extension().and_then(|s| s.to_str());
178 if ext != Some(OutputType::Object.extension()) {
179 // The file name does not end with ".o", so it can't be an object file.
183 // Strip the ".o" at the end
184 let ext2 = path.file_stem().and_then(|s| Path::new(s).extension()).and_then(|s| s.to_str());
186 // Check if the "inner" extension
187 ext2 == Some(RUST_CGU_EXT)