1 //! the rustc crate store interface. This also includes types that
2 //! are *mostly* used as a part of that interface, but these should
3 //! probably get a better home if someone can find one.
5 use crate::hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
6 use crate::hir::map as hir_map;
7 use crate::hir::map::definitions::{DefKey, DefPathTable};
8 use rustc_data_structures::svh::Svh;
9 use crate::ty::{self, TyCtxt};
10 use crate::session::{Session, CrateDisambiguator};
11 use crate::session::search_paths::PathKind;
14 use std::path::{Path, PathBuf};
16 use syntax::symbol::Symbol;
18 use rustc_target::spec::Target;
19 use rustc_data_structures::sync::{self, MetadataRef};
20 use rustc_macros::HashStable;
22 pub use self::NativeLibraryKind::*;
24 // lonely orphan structs and enums looking for a better home
26 /// Where a crate came from on the local filesystem. One of these three options
28 #[derive(PartialEq, Clone, Debug, HashStable)]
29 pub struct CrateSource {
30 pub dylib: Option<(PathBuf, PathKind)>,
31 pub rlib: Option<(PathBuf, PathKind)>,
32 pub rmeta: Option<(PathBuf, PathKind)>,
36 pub fn paths(&self) -> impl Iterator<Item = &PathBuf> {
37 self.dylib.iter().chain(self.rlib.iter()).chain(self.rmeta.iter()).map(|p| &p.0)
41 #[derive(RustcEncodable, RustcDecodable, Copy, Clone,
42 Ord, PartialOrd, Eq, PartialEq, Debug, HashStable)]
44 /// A dependency that is only used for its macros, none of which are visible from other crates.
45 /// These are included in the metadata only as placeholders and are ignored when decoding.
47 /// A dependency that is only used for its macros.
49 /// A dependency that is always injected into the dependency list and so
50 /// doesn't need to be linked to an rlib, e.g., the injected allocator.
52 /// A dependency that is required by an rlib version of this crate.
53 /// Ordinary `extern crate`s result in `Explicit` dependencies.
58 pub fn macros_only(self) -> bool {
60 DepKind::UnexportedMacrosOnly | DepKind::MacrosOnly => true,
61 DepKind::Implicit | DepKind::Explicit => false,
66 #[derive(PartialEq, Clone, Debug)]
74 pub fn is_some(&self) -> bool {
75 if let LibSource::Some(_) = *self {
82 pub fn option(&self) -> Option<PathBuf> {
84 LibSource::Some(ref p) => Some(p.clone()),
85 LibSource::MetadataOnly | LibSource::None => None,
90 #[derive(Copy, Debug, PartialEq, Clone, RustcEncodable, RustcDecodable, HashStable)]
91 pub enum LinkagePreference {
96 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash,
97 RustcEncodable, RustcDecodable, HashStable)]
98 pub enum NativeLibraryKind {
99 /// native static library (.a archive)
101 /// native static library, which doesn't get bundled into .rlibs
102 NativeStaticNobundle,
105 /// Windows dynamic library without import library.
107 /// default way to specify a dynamic library
111 #[derive(Clone, Debug, RustcEncodable, RustcDecodable, HashStable)]
112 pub struct NativeLibrary {
113 pub kind: NativeLibraryKind,
114 pub name: Option<Symbol>,
115 pub cfg: Option<ast::MetaItem>,
116 pub foreign_module: Option<DefId>,
117 pub wasm_import_module: Option<Symbol>,
120 #[derive(Clone, RustcEncodable, RustcDecodable, HashStable)]
121 pub struct ForeignModule {
122 pub foreign_items: Vec<DefId>,
126 #[derive(Copy, Clone, Debug, HashStable)]
127 pub struct ExternCrate {
128 pub src: ExternCrateSource,
130 /// span of the extern crate that caused this to be loaded
133 /// Number of links to reach the extern;
134 /// used to select the extern with the shortest path
137 /// Crate that depends on this crate
138 pub dependency_of: CrateNum,
142 /// If true, then this crate is the crate named by the extern
143 /// crate referenced above. If false, then this crate is a dep
145 pub fn is_direct(&self) -> bool {
146 self.dependency_of == LOCAL_CRATE
150 #[derive(Copy, Clone, Debug, HashStable)]
151 pub enum ExternCrateSource {
152 /// Crate is loaded by `extern crate`.
154 /// def_id of the item in the current crate that caused
155 /// this crate to be loaded; note that there could be multiple
159 /// Crate is implicitly loaded by a path resolving through extern prelude.
163 pub struct EncodedMetadata {
164 pub raw_data: Vec<u8>
167 impl EncodedMetadata {
168 pub fn new() -> EncodedMetadata {
170 raw_data: Vec::new(),
175 /// The backend's way to give the crate store access to the metadata in a library.
176 /// Note that it returns the raw metadata bytes stored in the library file, whether
177 /// it is compressed, uncompressed, some weird mix, etc.
178 /// rmeta files are backend independent and not handled here.
180 /// At the time of this writing, there is only one backend and one way to store
181 /// metadata in library -- this trait just serves to decouple rustc_metadata from
182 /// the archive reader, which depends on LLVM.
183 pub trait MetadataLoader {
184 fn get_rlib_metadata(&self,
187 -> Result<MetadataRef, String>;
188 fn get_dylib_metadata(&self,
191 -> Result<MetadataRef, String>;
194 pub type MetadataLoaderDyn = dyn MetadataLoader + Sync;
196 /// A store of Rust crates, through which their metadata can be accessed.
198 /// Note that this trait should probably not be expanding today. All new
199 /// functionality should be driven through queries instead!
201 /// If you find a method on this trait named `{name}_untracked` it signifies
202 /// that it's *not* tracked for dependency information throughout compilation
203 /// (it'd break incremental compilation) and should only be called pre-HIR (e.g.
205 pub trait CrateStore {
206 fn crate_data_as_any(&self, cnum: CrateNum) -> &dyn Any;
209 fn def_key(&self, def: DefId) -> DefKey;
210 fn def_path(&self, def: DefId) -> hir_map::DefPath;
211 fn def_path_hash(&self, def: DefId) -> hir_map::DefPathHash;
212 fn def_path_table(&self, cnum: CrateNum) -> &DefPathTable;
214 // "queries" used in resolve that aren't tracked for incremental compilation
215 fn crate_name_untracked(&self, cnum: CrateNum) -> Symbol;
216 fn crate_is_private_dep_untracked(&self, cnum: CrateNum) -> bool;
217 fn crate_disambiguator_untracked(&self, cnum: CrateNum) -> CrateDisambiguator;
218 fn crate_hash_untracked(&self, cnum: CrateNum) -> Svh;
219 fn crate_host_hash_untracked(&self, cnum: CrateNum) -> Option<Svh>;
220 fn item_generics_cloned_untracked(&self, def: DefId, sess: &Session) -> ty::Generics;
221 fn postorder_cnums_untracked(&self) -> Vec<CrateNum>;
223 // This is basically a 1-based range of ints, which is a little
224 // silly - I may fix that.
225 fn crates_untracked(&self) -> Vec<CrateNum>;
228 fn encode_metadata(&self, tcx: TyCtxt<'_>) -> EncodedMetadata;
229 fn metadata_encoding_version(&self) -> &[u8];
232 pub type CrateStoreDyn = dyn CrateStore + sync::Sync;
234 // This method is used when generating the command line to pass through to
235 // system linker. The linker expects undefined symbols on the left of the
236 // command line to be defined in libraries on the right, not the other way
237 // around. For more info, see some comments in the add_used_library function
240 // In order to get this left-to-right dependency ordering, we perform a
241 // topological sort of all crates putting the leaves at the right-most
243 pub fn used_crates(tcx: TyCtxt<'_>, prefer: LinkagePreference) -> Vec<(CrateNum, LibSource)> {
244 let mut libs = tcx.crates()
248 if tcx.dep_kind(cnum).macros_only() {
251 let source = tcx.used_crate_source(cnum);
252 let path = match prefer {
253 LinkagePreference::RequireDynamic => source.dylib.clone().map(|p| p.0),
254 LinkagePreference::RequireStatic => source.rlib.clone().map(|p| p.0),
256 let path = match path {
257 Some(p) => LibSource::Some(p),
259 if source.rmeta.is_some() {
260 LibSource::MetadataOnly
268 .collect::<Vec<_>>();
269 let mut ordering = tcx.postorder_cnums(LOCAL_CRATE).to_owned();
271 libs.sort_by_cached_key(|&(a, _)| {
272 ordering.iter().position(|x| *x == a)