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.
8 use rustc_data_structures::sync::{self, MetadataRef};
9 use rustc_hir::def_id::{CrateNum, DefId, LOCAL_CRATE};
10 use rustc_hir::definitions::{DefKey, DefPath, DefPathHash};
11 use rustc_macros::HashStable;
12 use rustc_session::search_paths::PathKind;
13 use rustc_session::utils::NativeLibKind;
14 use rustc_session::StableCrateId;
15 use rustc_span::symbol::Symbol;
17 use rustc_target::spec::Target;
20 use std::path::{Path, PathBuf};
22 // lonely orphan structs and enums looking for a better home
24 /// Where a crate came from on the local filesystem. One of these three options
26 #[derive(PartialEq, Clone, Debug, HashStable, Encodable, Decodable)]
27 pub struct CrateSource {
28 pub dylib: Option<(PathBuf, PathKind)>,
29 pub rlib: Option<(PathBuf, PathKind)>,
30 pub rmeta: Option<(PathBuf, PathKind)>,
34 pub fn paths(&self) -> impl Iterator<Item = &PathBuf> {
35 self.dylib.iter().chain(self.rlib.iter()).chain(self.rmeta.iter()).map(|p| &p.0)
39 #[derive(Encodable, Decodable, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Debug)]
41 pub enum CrateDepKind {
42 /// A dependency that is only used for its macros.
44 /// A dependency that is always injected into the dependency list and so
45 /// doesn't need to be linked to an rlib, e.g., the injected allocator.
47 /// A dependency that is required by an rlib version of this crate.
48 /// Ordinary `extern crate`s result in `Explicit` dependencies.
53 pub fn macros_only(self) -> bool {
55 CrateDepKind::MacrosOnly => true,
56 CrateDepKind::Implicit | CrateDepKind::Explicit => false,
61 #[derive(Copy, Debug, PartialEq, Clone, Encodable, Decodable, HashStable)]
62 pub enum LinkagePreference {
67 #[derive(Clone, Debug, Encodable, Decodable, HashStable)]
68 pub struct NativeLib {
69 pub kind: NativeLibKind,
70 pub name: Option<Symbol>,
71 pub cfg: Option<ast::MetaItem>,
72 pub foreign_module: Option<DefId>,
73 pub wasm_import_module: Option<Symbol>,
74 pub verbatim: Option<bool>,
75 pub dll_imports: Vec<DllImport>,
78 #[derive(Clone, Debug, PartialEq, Eq, Encodable, Decodable, Hash, HashStable)]
79 pub struct DllImport {
81 pub ordinal: Option<u16>,
82 /// Calling convention for the function.
84 /// On x86_64, this is always `DllCallingConvention::C`; on i686, it can be any
85 /// of the values, and we use `DllCallingConvention::C` to represent `"cdecl"`.
86 pub calling_convention: DllCallingConvention,
87 /// Span of import's "extern" declaration; used for diagnostics.
91 /// Calling convention for a function defined in an external library.
93 /// The usize value, where present, indicates the size of the function's argument list
95 #[derive(Copy, Clone, Debug, PartialEq, Eq, Encodable, Decodable, Hash, HashStable)]
96 pub enum DllCallingConvention {
103 #[derive(Clone, TyEncodable, TyDecodable, HashStable, Debug)]
104 pub struct ForeignModule {
105 pub foreign_items: Vec<DefId>,
109 #[derive(Copy, Clone, Debug, HashStable)]
110 pub struct ExternCrate {
111 pub src: ExternCrateSource,
113 /// span of the extern crate that caused this to be loaded
116 /// Number of links to reach the extern;
117 /// used to select the extern with the shortest path
120 /// Crate that depends on this crate
121 pub dependency_of: CrateNum,
125 /// If true, then this crate is the crate named by the extern
126 /// crate referenced above. If false, then this crate is a dep
128 pub fn is_direct(&self) -> bool {
129 self.dependency_of == LOCAL_CRATE
132 pub fn rank(&self) -> impl PartialOrd {
134 // - direct extern crate to indirect
135 // - shorter paths to longer
136 (self.is_direct(), !self.path_len)
140 #[derive(Copy, Clone, Debug, HashStable)]
141 pub enum ExternCrateSource {
142 /// Crate is loaded by `extern crate`.
144 /// def_id of the item in the current crate that caused
145 /// this crate to be loaded; note that there could be multiple
149 /// Crate is implicitly loaded by a path resolving through extern prelude.
153 #[derive(Encodable, Decodable)]
154 pub struct EncodedMetadata {
155 pub raw_data: Vec<u8>,
158 impl EncodedMetadata {
159 pub fn new() -> EncodedMetadata {
160 EncodedMetadata { raw_data: Vec::new() }
164 /// The backend's way to give the crate store access to the metadata in a library.
165 /// Note that it returns the raw metadata bytes stored in the library file, whether
166 /// it is compressed, uncompressed, some weird mix, etc.
167 /// rmeta files are backend independent and not handled here.
169 /// At the time of this writing, there is only one backend and one way to store
170 /// metadata in library -- this trait just serves to decouple rustc_metadata from
171 /// the archive reader, which depends on LLVM.
172 pub trait MetadataLoader {
173 fn get_rlib_metadata(&self, target: &Target, filename: &Path) -> Result<MetadataRef, String>;
174 fn get_dylib_metadata(&self, target: &Target, filename: &Path) -> Result<MetadataRef, String>;
177 pub type MetadataLoaderDyn = dyn MetadataLoader + Sync;
179 /// A store of Rust crates, through which their metadata can be accessed.
181 /// Note that this trait should probably not be expanding today. All new
182 /// functionality should be driven through queries instead!
184 /// If you find a method on this trait named `{name}_untracked` it signifies
185 /// that it's *not* tracked for dependency information throughout compilation
186 /// (it'd break incremental compilation) and should only be called pre-HIR (e.g.
188 pub trait CrateStore: std::fmt::Debug {
189 fn as_any(&self) -> &dyn Any;
191 // Foreign definitions.
192 // This information is safe to access, since it's hashed as part of the DefPathHash, which incr.
193 // comp. uses to identify a DefId.
194 fn def_key(&self, def: DefId) -> DefKey;
195 fn def_path(&self, def: DefId) -> DefPath;
196 fn def_path_hash(&self, def: DefId) -> DefPathHash;
198 // This information is safe to access, since it's hashed as part of the StableCrateId, which
199 // incr. comp. uses to identify a CrateNum.
200 fn crate_name(&self, cnum: CrateNum) -> Symbol;
201 fn stable_crate_id(&self, cnum: CrateNum) -> StableCrateId;
203 /// Fetch a DefId from a DefPathHash for a foreign crate.
204 fn def_path_hash_to_def_id(
212 fn encode_metadata(&self, tcx: TyCtxt<'_>) -> EncodedMetadata;
215 pub type CrateStoreDyn = dyn CrateStore + sync::Sync;