1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
2 #![feature(bool_to_option)]
3 #![feature(box_patterns)]
4 #![feature(try_blocks)]
5 #![feature(in_band_lifetimes)]
9 #![feature(associated_type_bounds)]
10 #![recursion_limit = "256"]
11 #![cfg_attr(not(bootstrap), allow(rustc::potential_query_instability))]
13 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
14 //! The backend-agnostic functions of this crate use functions defined in various traits that
15 //! have to be implemented by each backends.
18 extern crate rustc_macros;
22 extern crate rustc_middle;
25 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
26 use rustc_data_structures::sync::Lrc;
27 use rustc_hir::def_id::CrateNum;
28 use rustc_hir::LangItem;
29 use rustc_middle::dep_graph::WorkProduct;
30 use rustc_middle::middle::dependency_format::Dependencies;
31 use rustc_middle::ty::query::{ExternProviders, Providers};
32 use rustc_session::config::{CrateType, OutputFilenames, OutputType, RUST_CGU_EXT};
33 use rustc_session::cstore::{self, CrateSource};
34 use rustc_session::utils::NativeLibKind;
35 use rustc_span::symbol::Symbol;
36 use std::path::{Path, PathBuf};
47 pub mod target_features;
50 pub struct ModuleCodegen<M> {
51 /// The name of the module. When the crate may be saved between
52 /// compilations, incremental compilation requires that name be
53 /// unique amongst **all** crates. Therefore, it should contain
54 /// something unique to this crate (e.g., a module path) as well
55 /// as the crate name and disambiguator.
56 /// We currently generate these names via CodegenUnit::build_cgu_name().
62 // FIXME(eddyb) maybe include the crate name in this?
63 pub const METADATA_FILENAME: &str = "lib.rmeta";
65 impl<M> ModuleCodegen<M> {
66 pub fn into_compiled_module(
71 outputs: &OutputFilenames,
73 let object = emit_obj.then(|| outputs.temp_path(OutputType::Object, Some(&self.name)));
74 let dwarf_object = emit_dwarf_obj.then(|| outputs.temp_path_dwo(Some(&self.name)));
75 let bytecode = emit_bc.then(|| outputs.temp_path(OutputType::Bitcode, Some(&self.name)));
77 CompiledModule { name: self.name.clone(), kind: self.kind, object, dwarf_object, bytecode }
81 #[derive(Debug, Encodable, Decodable)]
82 pub struct CompiledModule {
85 pub object: Option<PathBuf>,
86 pub dwarf_object: Option<PathBuf>,
87 pub bytecode: Option<PathBuf>,
90 pub struct CachedModuleCodegen {
92 pub source: WorkProduct,
95 #[derive(Copy, Clone, Debug, PartialEq, Encodable, Decodable)]
102 bitflags::bitflags! {
103 pub struct MemFlags: u8 {
104 const VOLATILE = 1 << 0;
105 const NONTEMPORAL = 1 << 1;
106 const UNALIGNED = 1 << 2;
110 #[derive(Clone, Debug, Encodable, Decodable, HashStable)]
111 pub struct NativeLib {
112 pub kind: NativeLibKind,
113 pub name: Option<Symbol>,
114 pub cfg: Option<ast::MetaItem>,
115 pub verbatim: Option<bool>,
116 pub dll_imports: Vec<cstore::DllImport>,
119 impl From<&cstore::NativeLib> for NativeLib {
120 fn from(lib: &cstore::NativeLib) -> Self {
124 cfg: lib.cfg.clone(),
125 verbatim: lib.verbatim,
126 dll_imports: lib.dll_imports.clone(),
131 /// Misc info we load from metadata to persist beyond the tcx.
133 /// Note: though `CrateNum` is only meaningful within the same tcx, information within `CrateInfo`
134 /// is self-contained. `CrateNum` can be viewed as a unique identifier within a `CrateInfo`, where
135 /// `used_crate_source` contains all `CrateSource` of the dependents, and maintains a mapping from
136 /// identifiers (`CrateNum`) to `CrateSource`. The other fields map `CrateNum` to the crate's own
137 /// additional properties, so that effectively we can retrieve each dependent crate's `CrateSource`
138 /// and the corresponding properties without referencing information outside of a `CrateInfo`.
139 #[derive(Debug, Encodable, Decodable)]
140 pub struct CrateInfo {
141 pub target_cpu: String,
142 pub exported_symbols: FxHashMap<CrateType, Vec<String>>,
143 pub local_crate_name: Symbol,
144 pub compiler_builtins: Option<CrateNum>,
145 pub profiler_runtime: Option<CrateNum>,
146 pub is_no_builtins: FxHashSet<CrateNum>,
147 pub native_libraries: FxHashMap<CrateNum, Vec<NativeLib>>,
148 pub crate_name: FxHashMap<CrateNum, String>,
149 pub used_libraries: Vec<NativeLib>,
150 pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>,
151 pub used_crates: Vec<CrateNum>,
152 pub lang_item_to_crate: FxHashMap<LangItem, CrateNum>,
153 pub missing_lang_items: FxHashMap<CrateNum, Vec<LangItem>>,
154 pub dependency_formats: Lrc<Dependencies>,
155 pub windows_subsystem: Option<String>,
158 #[derive(Encodable, Decodable)]
159 pub struct CodegenResults {
160 pub modules: Vec<CompiledModule>,
161 pub allocator_module: Option<CompiledModule>,
162 pub metadata_module: Option<CompiledModule>,
163 pub metadata: rustc_metadata::EncodedMetadata,
164 pub crate_info: CrateInfo,
167 pub fn provide(providers: &mut Providers) {
168 crate::back::symbol_export::provide(providers);
169 crate::base::provide(providers);
170 crate::target_features::provide(providers);
173 pub fn provide_extern(providers: &mut ExternProviders) {
174 crate::back::symbol_export::provide_extern(providers);
177 /// Checks if the given filename ends with the `.rcgu.o` extension that `rustc`
178 /// uses for the object files it generates.
179 pub fn looks_like_rust_object_file(filename: &str) -> bool {
180 let path = Path::new(filename);
181 let ext = path.extension().and_then(|s| s.to_str());
182 if ext != Some(OutputType::Object.extension()) {
183 // The file name does not end with ".o", so it can't be an object file.
187 // Strip the ".o" at the end
188 let ext2 = path.file_stem().and_then(|s| Path::new(s).extension()).and_then(|s| s.to_str());
190 // Check if the "inner" extension
191 ext2 == Some(RUST_CGU_EXT)