1 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
3 #![feature(box_patterns)]
4 #![feature(box_syntax)]
5 #![feature(core_intrinsics)]
7 #![feature(slice_patterns)]
8 #![feature(stmt_expr_attributes)]
9 #![feature(try_blocks)]
10 #![feature(in_band_lifetimes)]
12 #![feature(trusted_len)]
13 #![feature(associated_type_bounds)]
15 #![recursion_limit="256"]
17 //! This crate contains codegen code that is used by all codegen backends (LLVM and others).
18 //! The backend-agnostic functions of this crate use functions defined in various traits that
19 //! have to be implemented by each backends.
21 #[macro_use] extern crate log;
22 #[macro_use] extern crate rustc;
23 #[macro_use] extern crate syntax;
25 use std::path::{Path, PathBuf};
26 use rustc::dep_graph::WorkProduct;
27 use rustc::session::config::{OutputFilenames, OutputType, RUST_CGU_EXT};
28 use rustc::middle::lang_items::LangItem;
29 use rustc::hir::def_id::CrateNum;
30 use rustc::ty::query::Providers;
31 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
32 use rustc_data_structures::sync::Lrc;
33 use rustc_data_structures::svh::Svh;
34 use rustc::middle::cstore::{LibSource, CrateSource, NativeLibrary};
35 use rustc::middle::dependency_format::Dependencies;
36 use syntax_pos::symbol::Symbol;
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 pub const METADATA_FILENAME: &str = "rust.metadata.bin";
63 pub const RLIB_BYTECODE_EXTENSION: &str = "bc.z";
66 impl<M> ModuleCodegen<M> {
67 pub fn into_compiled_module(self,
70 emit_bc_compressed: bool,
71 outputs: &OutputFilenames) -> CompiledModule {
72 let object = if emit_obj {
73 Some(outputs.temp_path(OutputType::Object, Some(&self.name)))
77 let bytecode = if emit_bc {
78 Some(outputs.temp_path(OutputType::Bitcode, Some(&self.name)))
82 let bytecode_compressed = if emit_bc_compressed {
83 Some(outputs.temp_path(OutputType::Bitcode, Some(&self.name))
84 .with_extension(RLIB_BYTECODE_EXTENSION))
90 name: self.name.clone(),
100 pub struct CompiledModule {
102 pub kind: ModuleKind,
103 pub object: Option<PathBuf>,
104 pub bytecode: Option<PathBuf>,
105 pub bytecode_compressed: Option<PathBuf>,
108 pub struct CachedModuleCodegen {
110 pub source: WorkProduct,
113 #[derive(Copy, Clone, Debug, PartialEq)]
114 pub enum ModuleKind {
120 bitflags::bitflags! {
121 pub struct MemFlags: u8 {
122 const VOLATILE = 1 << 0;
123 const NONTEMPORAL = 1 << 1;
124 const UNALIGNED = 1 << 2;
128 /// Misc info we load from metadata to persist beyond the tcx.
130 pub struct CrateInfo {
131 pub panic_runtime: Option<CrateNum>,
132 pub compiler_builtins: Option<CrateNum>,
133 pub profiler_runtime: Option<CrateNum>,
134 pub sanitizer_runtime: Option<CrateNum>,
135 pub is_no_builtins: FxHashSet<CrateNum>,
136 pub native_libraries: FxHashMap<CrateNum, Lrc<Vec<NativeLibrary>>>,
137 pub crate_name: FxHashMap<CrateNum, String>,
138 pub used_libraries: Lrc<Vec<NativeLibrary>>,
139 pub link_args: Lrc<Vec<String>>,
140 pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>,
141 pub used_crates_static: Vec<(CrateNum, LibSource)>,
142 pub used_crates_dynamic: Vec<(CrateNum, LibSource)>,
143 pub lang_item_to_crate: FxHashMap<LangItem, CrateNum>,
144 pub missing_lang_items: FxHashMap<CrateNum, Vec<LangItem>>,
145 pub dependency_formats: Lrc<Dependencies>,
149 pub struct CodegenResults {
150 pub crate_name: Symbol,
151 pub modules: Vec<CompiledModule>,
152 pub allocator_module: Option<CompiledModule>,
153 pub metadata_module: Option<CompiledModule>,
155 pub metadata: rustc::middle::cstore::EncodedMetadata,
156 pub windows_subsystem: Option<String>,
157 pub linker_info: back::linker::LinkerInfo,
158 pub crate_info: CrateInfo,
161 pub fn provide(providers: &mut Providers<'_>) {
162 crate::back::symbol_export::provide(providers);
163 crate::base::provide_both(providers);
166 pub fn provide_extern(providers: &mut Providers<'_>) {
167 crate::back::symbol_export::provide_extern(providers);
168 crate::base::provide_both(providers);
171 /// Checks if the given filename ends with the `.rcgu.o` extension that `rustc`
172 /// uses for the object files it generates.
173 pub fn looks_like_rust_object_file(filename: &str) -> bool {
174 let path = Path::new(filename);
175 let ext = path.extension().and_then(|s| s.to_str());
176 if ext != Some(OutputType::Object.extension()) {
177 // The file name does not end with ".o", so it can't be an object file.
181 // Strip the ".o" at the end
182 let ext2 = path.file_stem()
183 .and_then(|s| Path::new(s).extension())
184 .and_then(|s| s.to_str());
186 // Check if the "inner" extension
187 ext2 == Some(RUST_CGU_EXT)