1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
2 #![feature(bool_to_option)]
3 #![feature(box_patterns)]
4 #![feature(try_blocks)]
5 #![feature(in_band_lifetimes)]
7 #![feature(or_patterns)]
8 #![feature(trusted_len)]
9 #![feature(associated_type_bounds)]
10 #![recursion_limit = "256"]
12 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
13 //! The backend-agnostic functions of this crate use functions defined in various traits that
14 //! have to be implemented by each backends.
19 extern crate rustc_middle;
21 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
22 use rustc_data_structures::svh::Svh;
23 use rustc_data_structures::sync::Lrc;
24 use rustc_hir::def_id::CrateNum;
25 use rustc_hir::LangItem;
26 use rustc_middle::dep_graph::WorkProduct;
27 use rustc_middle::middle::cstore::{CrateSource, LibSource, NativeLibrary};
28 use rustc_middle::middle::dependency_format::Dependencies;
29 use rustc_middle::ty::query::Providers;
30 use rustc_session::config::{OutputFilenames, OutputType, RUST_CGU_EXT};
31 use rustc_span::symbol::Symbol;
32 use std::path::{Path, PathBuf};
44 pub struct ModuleCodegen<M> {
45 /// The name of the module. When the crate may be saved between
46 /// compilations, incremental compilation requires that name be
47 /// unique amongst **all** crates. Therefore, it should contain
48 /// something unique to this crate (e.g., a module path) as well
49 /// as the crate name and disambiguator.
50 /// We currently generate these names via CodegenUnit::build_cgu_name().
56 // FIXME(eddyb) maybe include the crate name in this?
57 pub const METADATA_FILENAME: &str = "lib.rmeta";
58 pub const RLIB_BYTECODE_EXTENSION: &str = "bc.z";
60 impl<M> ModuleCodegen<M> {
61 pub fn into_compiled_module(
65 emit_bc_compressed: bool,
66 outputs: &OutputFilenames,
68 let object = emit_obj.then(|| outputs.temp_path(OutputType::Object, Some(&self.name)));
69 let bytecode = emit_bc.then(|| outputs.temp_path(OutputType::Bitcode, Some(&self.name)));
70 let bytecode_compressed = emit_bc_compressed.then(|| {
72 .temp_path(OutputType::Bitcode, Some(&self.name))
73 .with_extension(RLIB_BYTECODE_EXTENSION)
77 name: self.name.clone(),
86 #[derive(Debug, RustcEncodable, RustcDecodable)]
87 pub struct CompiledModule {
90 pub object: Option<PathBuf>,
91 pub bytecode: Option<PathBuf>,
92 pub bytecode_compressed: Option<PathBuf>,
95 pub struct CachedModuleCodegen {
97 pub source: WorkProduct,
100 #[derive(Copy, Clone, Debug, PartialEq, RustcEncodable, RustcDecodable)]
101 pub enum ModuleKind {
107 bitflags::bitflags! {
108 pub struct MemFlags: u8 {
109 const VOLATILE = 1 << 0;
110 const NONTEMPORAL = 1 << 1;
111 const UNALIGNED = 1 << 2;
115 /// Misc info we load from metadata to persist beyond the tcx.
117 /// Note: though `CrateNum` is only meaningful within the same tcx, information within `CrateInfo`
118 /// is self-contained. `CrateNum` can be viewed as a unique identifier within a `CrateInfo`, where
119 /// `used_crate_source` contains all `CrateSource` of the dependents, and maintains a mapping from
120 /// identifiers (`CrateNum`) to `CrateSource`. The other fields map `CrateNum` to the crate's own
121 /// additional properties, so that effectively we can retrieve each dependent crate's `CrateSource`
122 /// and the corresponding properties without referencing information outside of a `CrateInfo`.
123 #[derive(Debug, RustcEncodable, RustcDecodable)]
124 pub struct CrateInfo {
125 pub panic_runtime: Option<CrateNum>,
126 pub compiler_builtins: Option<CrateNum>,
127 pub profiler_runtime: Option<CrateNum>,
128 pub is_no_builtins: FxHashSet<CrateNum>,
129 pub native_libraries: FxHashMap<CrateNum, Lrc<Vec<NativeLibrary>>>,
130 pub crate_name: FxHashMap<CrateNum, String>,
131 pub used_libraries: Lrc<Vec<NativeLibrary>>,
132 pub link_args: Lrc<Vec<String>>,
133 pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>,
134 pub used_crates_static: Vec<(CrateNum, LibSource)>,
135 pub used_crates_dynamic: Vec<(CrateNum, LibSource)>,
136 pub lang_item_to_crate: FxHashMap<LangItem, CrateNum>,
137 pub missing_lang_items: FxHashMap<CrateNum, Vec<LangItem>>,
138 pub dependency_formats: Lrc<Dependencies>,
141 #[derive(RustcEncodable, RustcDecodable)]
142 pub struct CodegenResults {
143 pub crate_name: Symbol,
144 pub modules: Vec<CompiledModule>,
145 pub allocator_module: Option<CompiledModule>,
146 pub metadata_module: Option<CompiledModule>,
148 pub metadata: rustc_middle::middle::cstore::EncodedMetadata,
149 pub windows_subsystem: Option<String>,
150 pub linker_info: back::linker::LinkerInfo,
151 pub crate_info: CrateInfo,
154 pub fn provide(providers: &mut Providers<'_>) {
155 crate::back::symbol_export::provide(providers);
156 crate::base::provide_both(providers);
159 pub fn provide_extern(providers: &mut Providers<'_>) {
160 crate::back::symbol_export::provide_extern(providers);
161 crate::base::provide_both(providers);
164 /// Checks if the given filename ends with the `.rcgu.o` extension that `rustc`
165 /// uses for the object files it generates.
166 pub fn looks_like_rust_object_file(filename: &str) -> bool {
167 let path = Path::new(filename);
168 let ext = path.extension().and_then(|s| s.to_str());
169 if ext != Some(OutputType::Object.extension()) {
170 // The file name does not end with ".o", so it can't be an object file.
174 // Strip the ".o" at the end
175 let ext2 = path.file_stem().and_then(|s| Path::new(s).extension()).and_then(|s| s.to_str());
177 // Check if the "inner" extension
178 ext2 == Some(RUST_CGU_EXT)