1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
2 #![feature(bool_to_option)]
3 #![feature(option_expect_none)]
4 #![feature(box_patterns)]
5 #![feature(try_blocks)]
6 #![feature(in_band_lifetimes)]
8 #![feature(or_patterns)]
9 #![feature(trusted_len)]
10 #![feature(associated_type_bounds)]
11 #![feature(const_fn)] // for rustc_index::newtype_index
12 #![feature(const_panic)] // for rustc_index::newtype_index
13 #![recursion_limit = "256"]
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.
22 extern crate rustc_middle;
24 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
25 use rustc_data_structures::svh::Svh;
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::cstore::{CrateSource, LibSource, NativeLib};
31 use rustc_middle::middle::dependency_format::Dependencies;
32 use rustc_middle::ty::query::Providers;
33 use rustc_session::config::{OutputFilenames, OutputType, RUST_CGU_EXT};
34 use rustc_span::symbol::Symbol;
35 use std::path::{Path, PathBuf};
48 pub struct ModuleCodegen<M> {
49 /// The name of the module. When the crate may be saved between
50 /// compilations, incremental compilation requires that name be
51 /// unique amongst **all** crates. Therefore, it should contain
52 /// something unique to this crate (e.g., a module path) as well
53 /// as the crate name and disambiguator.
54 /// We currently generate these names via CodegenUnit::build_cgu_name().
60 // FIXME(eddyb) maybe include the crate name in this?
61 pub const METADATA_FILENAME: &str = "lib.rmeta";
63 impl<M> ModuleCodegen<M> {
64 pub fn into_compiled_module(
68 outputs: &OutputFilenames,
70 let object = emit_obj.then(|| outputs.temp_path(OutputType::Object, Some(&self.name)));
71 let bytecode = emit_bc.then(|| outputs.temp_path(OutputType::Bitcode, Some(&self.name)));
73 CompiledModule { name: self.name.clone(), kind: self.kind, object, bytecode }
77 #[derive(Debug, RustcEncodable, RustcDecodable)]
78 pub struct CompiledModule {
81 pub object: Option<PathBuf>,
82 pub bytecode: Option<PathBuf>,
85 pub struct CachedModuleCodegen {
87 pub source: WorkProduct,
90 #[derive(Copy, Clone, Debug, PartialEq, RustcEncodable, RustcDecodable)]
98 pub struct MemFlags: u8 {
99 const VOLATILE = 1 << 0;
100 const NONTEMPORAL = 1 << 1;
101 const UNALIGNED = 1 << 2;
105 /// Misc info we load from metadata to persist beyond the tcx.
107 /// Note: though `CrateNum` is only meaningful within the same tcx, information within `CrateInfo`
108 /// is self-contained. `CrateNum` can be viewed as a unique identifier within a `CrateInfo`, where
109 /// `used_crate_source` contains all `CrateSource` of the dependents, and maintains a mapping from
110 /// identifiers (`CrateNum`) to `CrateSource`. The other fields map `CrateNum` to the crate's own
111 /// additional properties, so that effectively we can retrieve each dependent crate's `CrateSource`
112 /// and the corresponding properties without referencing information outside of a `CrateInfo`.
113 #[derive(Debug, RustcEncodable, RustcDecodable)]
114 pub struct CrateInfo {
115 pub panic_runtime: Option<CrateNum>,
116 pub compiler_builtins: Option<CrateNum>,
117 pub profiler_runtime: Option<CrateNum>,
118 pub is_no_builtins: FxHashSet<CrateNum>,
119 pub native_libraries: FxHashMap<CrateNum, Lrc<Vec<NativeLib>>>,
120 pub crate_name: FxHashMap<CrateNum, String>,
121 pub used_libraries: Lrc<Vec<NativeLib>>,
122 pub link_args: Lrc<Vec<String>>,
123 pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>,
124 pub used_crates_static: Vec<(CrateNum, LibSource)>,
125 pub used_crates_dynamic: Vec<(CrateNum, LibSource)>,
126 pub lang_item_to_crate: FxHashMap<LangItem, CrateNum>,
127 pub missing_lang_items: FxHashMap<CrateNum, Vec<LangItem>>,
128 pub dependency_formats: Lrc<Dependencies>,
131 #[derive(RustcEncodable, RustcDecodable)]
132 pub struct CodegenResults {
133 pub crate_name: Symbol,
134 pub modules: Vec<CompiledModule>,
135 pub allocator_module: Option<CompiledModule>,
136 pub metadata_module: Option<CompiledModule>,
138 pub metadata: rustc_middle::middle::cstore::EncodedMetadata,
139 pub windows_subsystem: Option<String>,
140 pub linker_info: back::linker::LinkerInfo,
141 pub crate_info: CrateInfo,
144 pub fn provide(providers: &mut Providers) {
145 crate::back::symbol_export::provide(providers);
146 crate::base::provide_both(providers);
149 pub fn provide_extern(providers: &mut Providers) {
150 crate::back::symbol_export::provide_extern(providers);
151 crate::base::provide_both(providers);
154 /// Checks if the given filename ends with the `.rcgu.o` extension that `rustc`
155 /// uses for the object files it generates.
156 pub fn looks_like_rust_object_file(filename: &str) -> bool {
157 let path = Path::new(filename);
158 let ext = path.extension().and_then(|s| s.to_str());
159 if ext != Some(OutputType::Object.extension()) {
160 // The file name does not end with ".o", so it can't be an object file.
164 // Strip the ".o" at the end
165 let ext2 = path.file_stem().and_then(|s| Path::new(s).extension()).and_then(|s| s.to_str());
167 // Check if the "inner" extension
168 ext2 == Some(RUST_CGU_EXT)