diff options
Diffstat (limited to 'compiler/rustc_session/src/cstore.rs')
-rw-r--r-- | compiler/rustc_session/src/cstore.rs | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/compiler/rustc_session/src/cstore.rs b/compiler/rustc_session/src/cstore.rs new file mode 100644 index 000000000..c1fd3c7c6 --- /dev/null +++ b/compiler/rustc_session/src/cstore.rs @@ -0,0 +1,218 @@ +//! the rustc crate store interface. This also includes types that +//! are *mostly* used as a part of that interface, but these should +//! probably get a better home if someone can find one. + +use crate::search_paths::PathKind; +use crate::utils::NativeLibKind; +use crate::Session; +use rustc_ast as ast; +use rustc_data_structures::sync::{self, MetadataRef}; +use rustc_hir::def_id::{CrateNum, DefId, StableCrateId, LOCAL_CRATE}; +use rustc_hir::definitions::{DefKey, DefPath, DefPathHash}; +use rustc_span::hygiene::{ExpnHash, ExpnId}; +use rustc_span::symbol::Symbol; +use rustc_span::Span; +use rustc_target::spec::Target; + +use std::any::Any; +use std::path::{Path, PathBuf}; + +// lonely orphan structs and enums looking for a better home + +/// Where a crate came from on the local filesystem. One of these three options +/// must be non-None. +#[derive(PartialEq, Clone, Debug, HashStable_Generic, Encodable, Decodable)] +pub struct CrateSource { + pub dylib: Option<(PathBuf, PathKind)>, + pub rlib: Option<(PathBuf, PathKind)>, + pub rmeta: Option<(PathBuf, PathKind)>, +} + +impl CrateSource { + #[inline] + pub fn paths(&self) -> impl Iterator<Item = &PathBuf> { + self.dylib.iter().chain(self.rlib.iter()).chain(self.rmeta.iter()).map(|p| &p.0) + } +} + +#[derive(Encodable, Decodable, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Debug)] +#[derive(HashStable_Generic)] +pub enum CrateDepKind { + /// A dependency that is only used for its macros. + MacrosOnly, + /// A dependency that is always injected into the dependency list and so + /// doesn't need to be linked to an rlib, e.g., the injected allocator. + Implicit, + /// A dependency that is required by an rlib version of this crate. + /// Ordinary `extern crate`s result in `Explicit` dependencies. + Explicit, +} + +impl CrateDepKind { + #[inline] + pub fn macros_only(self) -> bool { + match self { + CrateDepKind::MacrosOnly => true, + CrateDepKind::Implicit | CrateDepKind::Explicit => false, + } + } +} + +#[derive(Copy, Debug, PartialEq, Clone, Encodable, Decodable, HashStable_Generic)] +pub enum LinkagePreference { + RequireDynamic, + RequireStatic, +} + +#[derive(Debug, Encodable, Decodable, HashStable_Generic)] +pub struct NativeLib { + pub kind: NativeLibKind, + pub name: Option<Symbol>, + pub cfg: Option<ast::MetaItem>, + pub foreign_module: Option<DefId>, + pub wasm_import_module: Option<Symbol>, + pub verbatim: Option<bool>, + pub dll_imports: Vec<DllImport>, +} + +impl NativeLib { + pub fn has_modifiers(&self) -> bool { + self.verbatim.is_some() || self.kind.has_modifiers() + } +} + +#[derive(Clone, Debug, Encodable, Decodable, HashStable_Generic)] +pub struct DllImport { + pub name: Symbol, + pub ordinal: Option<u16>, + /// Calling convention for the function. + /// + /// On x86_64, this is always `DllCallingConvention::C`; on i686, it can be any + /// of the values, and we use `DllCallingConvention::C` to represent `"cdecl"`. + pub calling_convention: DllCallingConvention, + /// Span of import's "extern" declaration; used for diagnostics. + pub span: Span, +} + +/// Calling convention for a function defined in an external library. +/// +/// The usize value, where present, indicates the size of the function's argument list +/// in bytes. +#[derive(Clone, PartialEq, Debug, Encodable, Decodable, HashStable_Generic)] +pub enum DllCallingConvention { + C, + Stdcall(usize), + Fastcall(usize), + Vectorcall(usize), +} + +#[derive(Clone, Encodable, Decodable, HashStable_Generic, Debug)] +pub struct ForeignModule { + pub foreign_items: Vec<DefId>, + pub def_id: DefId, +} + +#[derive(Copy, Clone, Debug, HashStable_Generic)] +pub struct ExternCrate { + pub src: ExternCrateSource, + + /// span of the extern crate that caused this to be loaded + pub span: Span, + + /// Number of links to reach the extern; + /// used to select the extern with the shortest path + pub path_len: usize, + + /// Crate that depends on this crate + pub dependency_of: CrateNum, +} + +impl ExternCrate { + /// If true, then this crate is the crate named by the extern + /// crate referenced above. If false, then this crate is a dep + /// of the crate. + #[inline] + pub fn is_direct(&self) -> bool { + self.dependency_of == LOCAL_CRATE + } + + #[inline] + pub fn rank(&self) -> impl PartialOrd { + // Prefer: + // - direct extern crate to indirect + // - shorter paths to longer + (self.is_direct(), !self.path_len) + } +} + +#[derive(Copy, Clone, Debug, HashStable_Generic)] +pub enum ExternCrateSource { + /// Crate is loaded by `extern crate`. + Extern( + /// def_id of the item in the current crate that caused + /// this crate to be loaded; note that there could be multiple + /// such ids + DefId, + ), + /// Crate is implicitly loaded by a path resolving through extern prelude. + Path, +} + +/// The backend's way to give the crate store access to the metadata in a library. +/// Note that it returns the raw metadata bytes stored in the library file, whether +/// it is compressed, uncompressed, some weird mix, etc. +/// rmeta files are backend independent and not handled here. +/// +/// At the time of this writing, there is only one backend and one way to store +/// metadata in library -- this trait just serves to decouple rustc_metadata from +/// the archive reader, which depends on LLVM. +pub trait MetadataLoader { + fn get_rlib_metadata(&self, target: &Target, filename: &Path) -> Result<MetadataRef, String>; + fn get_dylib_metadata(&self, target: &Target, filename: &Path) -> Result<MetadataRef, String>; +} + +pub type MetadataLoaderDyn = dyn MetadataLoader + Sync; + +/// A store of Rust crates, through which their metadata can be accessed. +/// +/// Note that this trait should probably not be expanding today. All new +/// functionality should be driven through queries instead! +/// +/// If you find a method on this trait named `{name}_untracked` it signifies +/// that it's *not* tracked for dependency information throughout compilation +/// (it'd break incremental compilation) and should only be called pre-HIR (e.g. +/// during resolve) +pub trait CrateStore: std::fmt::Debug { + fn as_any(&self) -> &dyn Any; + + // Foreign definitions. + // This information is safe to access, since it's hashed as part of the DefPathHash, which incr. + // comp. uses to identify a DefId. + fn def_key(&self, def: DefId) -> DefKey; + fn def_path(&self, def: DefId) -> DefPath; + fn def_path_hash(&self, def: DefId) -> DefPathHash; + + // This information is safe to access, since it's hashed as part of the StableCrateId, which + // incr. comp. uses to identify a CrateNum. + fn crate_name(&self, cnum: CrateNum) -> Symbol; + fn stable_crate_id(&self, cnum: CrateNum) -> StableCrateId; + fn stable_crate_id_to_crate_num(&self, stable_crate_id: StableCrateId) -> CrateNum; + + /// Fetch a DefId from a DefPathHash for a foreign crate. + fn def_path_hash_to_def_id(&self, cnum: CrateNum, hash: DefPathHash) -> DefId; + fn expn_hash_to_expn_id( + &self, + sess: &Session, + cnum: CrateNum, + index_guess: u32, + hash: ExpnHash, + ) -> ExpnId; + + /// Imports all `SourceFile`s from the given crate into the current session. + /// This normally happens automatically when we decode a `Span` from + /// that crate's metadata - however, the incr comp cache needs + /// to trigger this manually when decoding a foreign `Span` + fn import_source_files(&self, sess: &Session, cnum: CrateNum); +} + +pub type CrateStoreDyn = dyn CrateStore + sync::Sync; |