src/librustc/middle/cstore.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
  12 // file at the top-level directory of this distribution and at
  13 // http://rust-lang.org/COPYRIGHT.
  14 //
  15 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
  16 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
  17 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
  18 // option. This file may not be copied, modified, or distributed
  19 // except according to those terms.
  20
  21 // the rustc crate store interface. This also includes types that
  22 // are *mostly* used as a part of that interface, but these should
  23 // probably get a better home if someone can find one.
  24
  25 use hir::def;
  26 use dep_graph::DepNode;
  27 use hir::def_id::{CrateNum, DefId, DefIndex};
  28 use hir::map as hir_map;
  29 use hir::map::definitions::{Definitions, DefKey, DisambiguatedDefPathData,
  30                             DefPathTable};
  31 use hir::svh::Svh;
  32 use ich;
  33 use middle::lang_items;
  34 use ty::{self, TyCtxt};
  35 use session::Session;
  36 use session::search_paths::PathKind;
  37 use util::nodemap::{NodeSet, DefIdMap};
  38
  39 use std::any::Any;
  40 use std::path::{Path, PathBuf};
  41 use std::rc::Rc;
  42 use owning_ref::ErasedBoxRef;
  43 use syntax::ast;
  44 use syntax::ext::base::SyntaxExtension;
  45 use syntax::symbol::Symbol;
  46 use syntax_pos::Span;
  47 use rustc_back::target::Target;
  48 use hir;
  49 use rustc_back::PanicStrategy;
  50
  51 pub use self::NativeLibraryKind::*;
  52
  53 // lonely orphan structs and enums looking for a better home
  54
  55 #[derive(Clone, Debug)]
  56 pub struct LinkMeta {
  57     pub crate_hash: Svh,
  58 }
  59
  60 // Where a crate came from on the local filesystem. One of these three options
  61 // must be non-None.
  62 #[derive(PartialEq, Clone, Debug)]
  63 pub struct CrateSource {
  64     pub dylib: Option<(PathBuf, PathKind)>,
  65     pub rlib: Option<(PathBuf, PathKind)>,
  66     pub rmeta: Option<(PathBuf, PathKind)>,
  67 }
  68
  69 #[derive(RustcEncodable, RustcDecodable, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Debug)]
  70 pub enum DepKind {
  71     /// A dependency that is only used for its macros, none of which are visible from other crates.
  72     /// These are included in the metadata only as placeholders and are ignored when decoding.
  73     UnexportedMacrosOnly,
  74     /// A dependency that is only used for its macros.
  75     MacrosOnly,
  76     /// A dependency that is always injected into the dependency list and so
  77     /// doesn't need to be linked to an rlib, e.g. the injected allocator.
  78     Implicit,
  79     /// A dependency that is required by an rlib version of this crate.
  80     /// Ordinary `extern crate`s result in `Explicit` dependencies.
  81     Explicit,
  82 }
  83
  84 impl DepKind {
  85     pub fn macros_only(self) -> bool {
  86         match self {
  87             DepKind::UnexportedMacrosOnly | DepKind::MacrosOnly => true,
  88             DepKind::Implicit | DepKind::Explicit => false,
  89         }
  90     }
  91 }
  92
  93 #[derive(PartialEq, Clone, Debug)]
  94 pub enum LibSource {
  95     Some(PathBuf),
  96     MetadataOnly,
  97     None,
  98 }
  99
 100 impl LibSource {
 101     pub fn is_some(&self) -> bool {
 102         if let LibSource::Some(_) = *self {
 103             true
 104         } else {
 105             false
 106         }
 107     }
 108
 109     pub fn option(&self) -> Option<PathBuf> {
 110         match *self {
 111             LibSource::Some(ref p) => Some(p.clone()),
 112             LibSource::MetadataOnly | LibSource::None => None,
 113         }
 114     }
 115 }
 116
 117 #[derive(Copy, Debug, PartialEq, Clone, RustcEncodable, RustcDecodable)]
 118 pub enum LinkagePreference {
 119     RequireDynamic,
 120     RequireStatic,
 121 }
 122
 123 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, RustcEncodable, RustcDecodable)]
 124 pub enum NativeLibraryKind {
 125     NativeStatic,    // native static library (.a archive)
 126     NativeStaticNobundle, // native static library, which doesn't get bundled into .rlibs
 127     NativeFramework, // macOS-specific
 128     NativeUnknown,   // default way to specify a dynamic library
 129 }
 130
 131 #[derive(Clone, Hash, RustcEncodable, RustcDecodable)]
 132 pub struct NativeLibrary {
 133     pub kind: NativeLibraryKind,
 134     pub name: Symbol,
 135     pub cfg: Option<ast::MetaItem>,
 136     pub foreign_items: Vec<DefIndex>,
 137 }
 138
 139 pub enum LoadedMacro {
 140     MacroDef(ast::Item),
 141     ProcMacro(Rc<SyntaxExtension>),
 142 }
 143
 144 #[derive(Copy, Clone, Debug)]
 145 pub struct ExternCrate {
 146     /// def_id of an `extern crate` in the current crate that caused
 147     /// this crate to be loaded; note that there could be multiple
 148     /// such ids
 149     pub def_id: DefId,
 150
 151     /// span of the extern crate that caused this to be loaded
 152     pub span: Span,
 153
 154     /// If true, then this crate is the crate named by the extern
 155     /// crate referenced above. If false, then this crate is a dep
 156     /// of the crate.
 157     pub direct: bool,
 158
 159     /// Number of links to reach the extern crate `def_id`
 160     /// declaration; used to select the extern crate with the shortest
 161     /// path
 162     pub path_len: usize,
 163 }
 164
 165 pub struct EncodedMetadata {
 166     pub raw_data: Vec<u8>,
 167     pub hashes: EncodedMetadataHashes,
 168 }
 169
 170 impl EncodedMetadata {
 171     pub fn new() -> EncodedMetadata {
 172         EncodedMetadata {
 173             raw_data: Vec::new(),
 174             hashes: EncodedMetadataHashes::new(),
 175         }
 176     }
 177 }
 178
 179 /// The hash for some metadata that (when saving) will be exported
 180 /// from this crate, or which (when importing) was exported by an
 181 /// upstream crate.
 182 #[derive(Debug, RustcEncodable, RustcDecodable, Copy, Clone)]
 183 pub struct EncodedMetadataHash {
 184     pub def_index: DefIndex,
 185     pub hash: ich::Fingerprint,
 186 }
 187
 188 /// The hash for some metadata that (when saving) will be exported
 189 /// from this crate, or which (when importing) was exported by an
 190 /// upstream crate.
 191 #[derive(Debug, RustcEncodable, RustcDecodable, Clone)]
 192 pub struct EncodedMetadataHashes {
 193     pub entry_hashes: Vec<EncodedMetadataHash>,
 194     pub global_hashes: Vec<(DepNode<()>, ich::Fingerprint)>,
 195 }
 196
 197 impl EncodedMetadataHashes {
 198     pub fn new() -> EncodedMetadataHashes {
 199         EncodedMetadataHashes {
 200             entry_hashes: Vec::new(),
 201             global_hashes: Vec::new(),
 202         }
 203     }
 204 }
 205
 206 /// The backend's way to give the crate store access to the metadata in a library.
 207 /// Note that it returns the raw metadata bytes stored in the library file, whether
 208 /// it is compressed, uncompressed, some weird mix, etc.
 209 /// rmeta files are backend independent and not handled here.
 210 ///
 211 /// At the time of this writing, there is only one backend and one way to store
 212 /// metadata in library -- this trait just serves to decouple rustc_metadata from
 213 /// the archive reader, which depends on LLVM.
 214 pub trait MetadataLoader {
 215     fn get_rlib_metadata(&self,
 216                          target: &Target,
 217                          filename: &Path)
 218                          -> Result<ErasedBoxRef<[u8]>, String>;
 219     fn get_dylib_metadata(&self,
 220                           target: &Target,
 221                           filename: &Path)
 222                           -> Result<ErasedBoxRef<[u8]>, String>;
 223 }
 224
 225 /// A store of Rust crates, through with their metadata
 226 /// can be accessed.
 227 pub trait CrateStore {
 228     fn crate_data_as_rc_any(&self, krate: CrateNum) -> Rc<Any>;
 229
 230     // access to the metadata loader
 231     fn metadata_loader(&self) -> &MetadataLoader;
 232
 233     // item info
 234     fn visibility(&self, def: DefId) -> ty::Visibility;
 235     fn visible_parent_map<'a>(&'a self) -> ::std::cell::Ref<'a, DefIdMap<DefId>>;
 236     fn item_generics_cloned(&self, def: DefId) -> ty::Generics;
 237
 238     // trait info
 239     fn implementations_of_trait(&self, filter: Option<DefId>) -> Vec<DefId>;
 240
 241     // impl info
 242     fn impl_defaultness(&self, def: DefId) -> hir::Defaultness;
 243
 244     // trait/impl-item info
 245     fn associated_item_cloned(&self, def: DefId) -> ty::AssociatedItem;
 246
 247     // flags
 248     fn is_const_fn(&self, did: DefId) -> bool;
 249     fn is_dllimport_foreign_item(&self, def: DefId) -> bool;
 250     fn is_statically_included_foreign_item(&self, def_id: DefId) -> bool;
 251
 252     // crate metadata
 253     fn dylib_dependency_formats(&self, cnum: CrateNum)
 254                                     -> Vec<(CrateNum, LinkagePreference)>;
 255     fn dep_kind(&self, cnum: CrateNum) -> DepKind;
 256     fn export_macros(&self, cnum: CrateNum);
 257     fn lang_items(&self, cnum: CrateNum) -> Vec<(DefIndex, usize)>;
 258     fn missing_lang_items(&self, cnum: CrateNum) -> Vec<lang_items::LangItem>;
 259     fn is_allocator(&self, cnum: CrateNum) -> bool;
 260     fn is_panic_runtime(&self, cnum: CrateNum) -> bool;
 261     fn is_compiler_builtins(&self, cnum: CrateNum) -> bool;
 262     fn is_sanitizer_runtime(&self, cnum: CrateNum) -> bool;
 263     fn panic_strategy(&self, cnum: CrateNum) -> PanicStrategy;
 264     fn extern_crate(&self, cnum: CrateNum) -> Option<ExternCrate>;
 265     /// The name of the crate as it is referred to in source code of the current
 266     /// crate.
 267     fn crate_name(&self, cnum: CrateNum) -> Symbol;
 268     /// The name of the crate as it is stored in the crate's metadata.
 269     fn original_crate_name(&self, cnum: CrateNum) -> Symbol;
 270     fn crate_hash(&self, cnum: CrateNum) -> Svh;
 271     fn crate_disambiguator(&self, cnum: CrateNum) -> Symbol;
 272     fn plugin_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>;
 273     fn derive_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>;
 274     fn native_libraries(&self, cnum: CrateNum) -> Vec<NativeLibrary>;
 275     fn exported_symbols(&self, cnum: CrateNum) -> Vec<DefId>;
 276     fn is_no_builtins(&self, cnum: CrateNum) -> bool;
 277
 278     // resolve
 279     fn retrace_path(&self,
 280                     cnum: CrateNum,
 281                     path_data: &[DisambiguatedDefPathData])
 282                     -> Option<DefId>;
 283     fn def_key(&self, def: DefId) -> DefKey;
 284     fn def_path(&self, def: DefId) -> hir_map::DefPath;
 285     fn def_path_hash(&self, def: DefId) -> hir_map::DefPathHash;
 286     fn def_path_table(&self, cnum: CrateNum) -> Rc<DefPathTable>;
 287     fn struct_field_names(&self, def: DefId) -> Vec<ast::Name>;
 288     fn item_children(&self, did: DefId) -> Vec<def::Export>;
 289     fn load_macro(&self, did: DefId, sess: &Session) -> LoadedMacro;
 290
 291     // misc. metadata
 292     fn item_body<'a, 'tcx>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>, def: DefId)
 293                            -> &'tcx hir::Body;
 294
 295     // This is basically a 1-based range of ints, which is a little
 296     // silly - I may fix that.
 297     fn crates(&self) -> Vec<CrateNum>;
 298     fn used_libraries(&self) -> Vec<NativeLibrary>;
 299     fn used_link_args(&self) -> Vec<String>;
 300
 301     // utility functions
 302     fn used_crates(&self, prefer: LinkagePreference) -> Vec<(CrateNum, LibSource)>;
 303     fn used_crate_source(&self, cnum: CrateNum) -> CrateSource;
 304     fn extern_mod_stmt_cnum(&self, emod_id: ast::NodeId) -> Option<CrateNum>;
 305     fn encode_metadata<'a, 'tcx>(&self,
 306                                  tcx: TyCtxt<'a, 'tcx, 'tcx>,
 307                                  link_meta: &LinkMeta,
 308                                  reachable: &NodeSet)
 309                                  -> EncodedMetadata;
 310     fn metadata_encoding_version(&self) -> &[u8];
 311 }
 312
 313 // FIXME: find a better place for this?
 314 pub fn validate_crate_name(sess: Option<&Session>, s: &str, sp: Option<Span>) {
 315     let mut err_count = 0;
 316     {
 317         let mut say = |s: &str| {
 318             match (sp, sess) {
 319                 (_, None) => bug!("{}", s),
 320                 (Some(sp), Some(sess)) => sess.span_err(sp, s),
 321                 (None, Some(sess)) => sess.err(s),
 322             }
 323             err_count += 1;
 324         };
 325         if s.is_empty() {
 326             say("crate name must not be empty");
 327         }
 328         for c in s.chars() {
 329             if c.is_alphanumeric() { continue }
 330             if c == '_'  { continue }
 331             say(&format!("invalid character `{}` in crate name: `{}`", c, s));
 332         }
 333     }
 334
 335     if err_count > 0 {
 336         sess.unwrap().abort_if_errors();
 337     }
 338 }
 339
 340 /// A dummy crate store that does not support any non-local crates,
 341 /// for test purposes.
 342 pub struct DummyCrateStore;
 343
 344 #[allow(unused_variables)]
 345 impl CrateStore for DummyCrateStore {
 346     fn crate_data_as_rc_any(&self, krate: CrateNum) -> Rc<Any>
 347         { bug!("crate_data_as_rc_any") }
 348     // item info
 349     fn visibility(&self, def: DefId) -> ty::Visibility { bug!("visibility") }
 350     fn visible_parent_map<'a>(&'a self) -> ::std::cell::Ref<'a, DefIdMap<DefId>> {
 351         bug!("visible_parent_map")
 352     }
 353     fn item_generics_cloned(&self, def: DefId) -> ty::Generics
 354         { bug!("item_generics_cloned") }
 355
 356     // trait info
 357     fn implementations_of_trait(&self, filter: Option<DefId>) -> Vec<DefId> { vec![] }
 358
 359     // impl info
 360     fn impl_defaultness(&self, def: DefId) -> hir::Defaultness { bug!("impl_defaultness") }
 361
 362     // trait/impl-item info
 363     fn associated_item_cloned(&self, def: DefId) -> ty::AssociatedItem
 364         { bug!("associated_item_cloned") }
 365
 366     // flags
 367     fn is_const_fn(&self, did: DefId) -> bool { bug!("is_const_fn") }
 368     fn is_dllimport_foreign_item(&self, id: DefId) -> bool { false }
 369     fn is_statically_included_foreign_item(&self, def_id: DefId) -> bool { false }
 370
 371     // crate metadata
 372     fn dylib_dependency_formats(&self, cnum: CrateNum)
 373                                     -> Vec<(CrateNum, LinkagePreference)>
 374         { bug!("dylib_dependency_formats") }
 375     fn lang_items(&self, cnum: CrateNum) -> Vec<(DefIndex, usize)>
 376         { bug!("lang_items") }
 377     fn missing_lang_items(&self, cnum: CrateNum) -> Vec<lang_items::LangItem>
 378         { bug!("missing_lang_items") }
 379     fn dep_kind(&self, cnum: CrateNum) -> DepKind { bug!("is_explicitly_linked") }
 380     fn export_macros(&self, cnum: CrateNum) { bug!("export_macros") }
 381     fn is_allocator(&self, cnum: CrateNum) -> bool { bug!("is_allocator") }
 382     fn is_panic_runtime(&self, cnum: CrateNum) -> bool { bug!("is_panic_runtime") }
 383     fn is_compiler_builtins(&self, cnum: CrateNum) -> bool { bug!("is_compiler_builtins") }
 384     fn is_sanitizer_runtime(&self, cnum: CrateNum) -> bool { bug!("is_sanitizer_runtime") }
 385     fn panic_strategy(&self, cnum: CrateNum) -> PanicStrategy {
 386         bug!("panic_strategy")
 387     }
 388     fn extern_crate(&self, cnum: CrateNum) -> Option<ExternCrate> { bug!("extern_crate") }
 389     fn crate_name(&self, cnum: CrateNum) -> Symbol { bug!("crate_name") }
 390     fn original_crate_name(&self, cnum: CrateNum) -> Symbol {
 391         bug!("original_crate_name")
 392     }
 393     fn crate_hash(&self, cnum: CrateNum) -> Svh { bug!("crate_hash") }
 394     fn crate_disambiguator(&self, cnum: CrateNum)
 395                            -> Symbol { bug!("crate_disambiguator") }
 396     fn plugin_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>
 397         { bug!("plugin_registrar_fn") }
 398     fn derive_registrar_fn(&self, cnum: CrateNum) -> Option<DefId>
 399         { bug!("derive_registrar_fn") }
 400     fn native_libraries(&self, cnum: CrateNum) -> Vec<NativeLibrary>
 401         { bug!("native_libraries") }
 402     fn exported_symbols(&self, cnum: CrateNum) -> Vec<DefId> { bug!("exported_symbols") }
 403     fn is_no_builtins(&self, cnum: CrateNum) -> bool { bug!("is_no_builtins") }
 404
 405     // resolve
 406     fn retrace_path(&self,
 407                     cnum: CrateNum,
 408                     path_data: &[DisambiguatedDefPathData])
 409                     -> Option<DefId> {
 410         None
 411     }
 412
 413     fn def_key(&self, def: DefId) -> DefKey { bug!("def_key") }
 414     fn def_path(&self, def: DefId) -> hir_map::DefPath {
 415         bug!("relative_def_path")
 416     }
 417     fn def_path_hash(&self, def: DefId) -> hir_map::DefPathHash {
 418         bug!("def_path_hash")
 419     }
 420     fn def_path_table(&self, cnum: CrateNum) -> Rc<DefPathTable> {
 421         bug!("def_path_table")
 422     }
 423     fn struct_field_names(&self, def: DefId) -> Vec<ast::Name> { bug!("struct_field_names") }
 424     fn item_children(&self, did: DefId) -> Vec<def::Export> { bug!("item_children") }
 425     fn load_macro(&self, did: DefId, sess: &Session) -> LoadedMacro { bug!("load_macro") }
 426
 427     // misc. metadata
 428     fn item_body<'a, 'tcx>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>, def: DefId)
 429                            -> &'tcx hir::Body {
 430         bug!("item_body")
 431     }
 432
 433     // This is basically a 1-based range of ints, which is a little
 434     // silly - I may fix that.
 435     fn crates(&self) -> Vec<CrateNum> { vec![] }
 436     fn used_libraries(&self) -> Vec<NativeLibrary> { vec![] }
 437     fn used_link_args(&self) -> Vec<String> { vec![] }
 438
 439     // utility functions
 440     fn used_crates(&self, prefer: LinkagePreference) -> Vec<(CrateNum, LibSource)>
 441         { vec![] }
 442     fn used_crate_source(&self, cnum: CrateNum) -> CrateSource { bug!("used_crate_source") }
 443     fn extern_mod_stmt_cnum(&self, emod_id: ast::NodeId) -> Option<CrateNum> { None }
 444     fn encode_metadata<'a, 'tcx>(&self,
 445                                  tcx: TyCtxt<'a, 'tcx, 'tcx>,
 446                                  link_meta: &LinkMeta,
 447                                  reachable: &NodeSet)
 448                                  -> EncodedMetadata {
 449         bug!("encode_metadata")
 450     }
 451     fn metadata_encoding_version(&self) -> &[u8] { bug!("metadata_encoding_version") }
 452
 453     // access to the metadata loader
 454     fn metadata_loader(&self) -> &MetadataLoader { bug!("metadata_loader") }
 455 }
 456
 457 pub trait CrateLoader {
 458     fn process_item(&mut self, item: &ast::Item, defs: &Definitions);
 459     fn postprocess(&mut self, krate: &ast::Crate);
 460 }