1 // Copyright 2012-2014 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.
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.
11 // The crate store - a central repo for information collected about external
12 // crates and libraries
14 use schema::{self, Tracked};
16 use rustc::dep_graph::DepGraph;
17 use rustc::hir::def_id::{CRATE_DEF_INDEX, CrateNum, DefIndex, DefId};
18 use rustc::hir::map::definitions::{DefPathTable, GlobalMetaDataKind};
19 use rustc::hir::svh::Svh;
20 use rustc::middle::cstore::{DepKind, ExternCrate, MetadataLoader};
21 use rustc_back::PanicStrategy;
22 use rustc_data_structures::indexed_vec::IndexVec;
23 use rustc::util::nodemap::{FxHashMap, FxHashSet, NodeMap};
25 use std::cell::{RefCell, Cell};
27 use owning_ref::ErasedBoxRef;
28 use syntax::{ast, attr};
29 use syntax::ext::base::SyntaxExtension;
30 use syntax::symbol::Symbol;
33 pub use rustc::middle::cstore::{NativeLibrary, NativeLibraryKind, LinkagePreference};
34 pub use rustc::middle::cstore::NativeLibraryKind::*;
35 pub use rustc::middle::cstore::{CrateSource, LibSource};
37 pub use cstore_impl::{provide, provide_local};
39 // A map from external crate numbers (as decoded from some crate file) to
40 // local crate numbers (as generated during this session). Each external
41 // crate may refer to types in other external crates, and each has their
43 pub type CrateNumMap = IndexVec<CrateNum, CrateNum>;
45 pub struct MetadataBlob(pub ErasedBoxRef<[u8]>);
47 /// Holds information about a syntax_pos::FileMap imported from another crate.
48 /// See `imported_filemaps()` for more information.
49 pub struct ImportedFileMap {
50 /// This FileMap's byte-offset within the codemap of its original crate
51 pub original_start_pos: syntax_pos::BytePos,
52 /// The end of this FileMap within the codemap of its original crate
53 pub original_end_pos: syntax_pos::BytePos,
54 /// The imported FileMap's representation within the local codemap
55 pub translated_filemap: Rc<syntax_pos::FileMap>,
58 pub struct CrateMetadata {
61 /// Information about the extern crate that caused this crate to
62 /// be loaded. If this is `None`, then the crate was injected
63 /// (e.g., by the allocator)
64 pub extern_crate: Cell<Option<ExternCrate>>,
66 pub blob: MetadataBlob,
67 pub cnum_map: RefCell<CrateNumMap>,
69 pub codemap_import_info: RefCell<Vec<ImportedFileMap>>,
70 pub attribute_cache: RefCell<[Vec<Option<Rc<[ast::Attribute]>>>; 2]>,
72 pub root: schema::CrateRoot,
74 /// For each public item in this crate, we encode a key. When the
75 /// crate is loaded, we read all the keys and put them in this
76 /// hashmap, which gives the reverse mapping. This allows us to
77 /// quickly retrace a `DefPath`, which is needed for incremental
78 /// compilation support.
79 pub def_path_table: Rc<DefPathTable>,
81 pub exported_symbols: Tracked<FxHashSet<DefIndex>>,
83 pub trait_impls: Tracked<FxHashMap<(u32, DefIndex), schema::LazySeq<DefIndex>>>,
85 pub dep_kind: Cell<DepKind>,
86 pub source: CrateSource,
88 pub proc_macros: Option<Vec<(ast::Name, Rc<SyntaxExtension>)>>,
89 // Foreign items imported from a dylib (Windows only)
90 pub dllimport_foreign_items: Tracked<FxHashSet<DefIndex>>,
94 pub dep_graph: DepGraph,
95 metas: RefCell<FxHashMap<CrateNum, Rc<CrateMetadata>>>,
96 /// Map from NodeId's of local extern crate statements to crate numbers
97 extern_mod_crate_map: RefCell<NodeMap<CrateNum>>,
98 pub metadata_loader: Box<MetadataLoader>,
102 pub fn new(dep_graph: &DepGraph, metadata_loader: Box<MetadataLoader>) -> CStore {
104 dep_graph: dep_graph.clone(),
105 metas: RefCell::new(FxHashMap()),
106 extern_mod_crate_map: RefCell::new(FxHashMap()),
111 pub fn next_crate_num(&self) -> CrateNum {
112 CrateNum::new(self.metas.borrow().len() + 1)
115 pub fn get_crate_data(&self, cnum: CrateNum) -> Rc<CrateMetadata> {
116 self.metas.borrow().get(&cnum).unwrap().clone()
119 pub fn set_crate_data(&self, cnum: CrateNum, data: Rc<CrateMetadata>) {
120 self.metas.borrow_mut().insert(cnum, data);
123 pub fn iter_crate_data<I>(&self, mut i: I)
124 where I: FnMut(CrateNum, &Rc<CrateMetadata>)
126 for (&k, v) in self.metas.borrow().iter() {
131 pub fn crate_dependencies_in_rpo(&self, krate: CrateNum) -> Vec<CrateNum> {
132 let mut ordering = Vec::new();
133 self.push_dependencies_in_postorder(&mut ordering, krate);
138 pub fn push_dependencies_in_postorder(&self, ordering: &mut Vec<CrateNum>, krate: CrateNum) {
139 if ordering.contains(&krate) {
143 let data = self.get_crate_data(krate);
144 for &dep in data.cnum_map.borrow().iter() {
146 self.push_dependencies_in_postorder(ordering, dep);
150 ordering.push(krate);
153 pub fn do_postorder_cnums_untracked(&self) -> Vec<CrateNum> {
154 let mut ordering = Vec::new();
155 for (&num, _) in self.metas.borrow().iter() {
156 self.push_dependencies_in_postorder(&mut ordering, num);
161 pub fn add_extern_mod_stmt_cnum(&self, emod_id: ast::NodeId, cnum: CrateNum) {
162 self.extern_mod_crate_map.borrow_mut().insert(emod_id, cnum);
165 pub fn do_extern_mod_stmt_cnum(&self, emod_id: ast::NodeId) -> Option<CrateNum> {
166 self.extern_mod_crate_map.borrow().get(&emod_id).cloned()
169 pub fn read_dep_node(&self, def_id: DefId) {
170 use rustc::middle::cstore::CrateStore;
171 let def_path_hash = self.def_path_hash(def_id);
172 let dep_node = def_path_hash.to_dep_node(::rustc::dep_graph::DepKind::MetaData);
173 self.dep_graph.read(dep_node);
178 pub fn name(&self) -> Symbol {
181 pub fn hash(&self) -> Svh {
184 pub fn disambiguator(&self) -> Symbol {
185 self.root.disambiguator
188 pub fn needs_allocator(&self, dep_graph: &DepGraph) -> bool {
189 let attrs = self.get_item_attrs(CRATE_DEF_INDEX, dep_graph);
190 attr::contains_name(&attrs, "needs_allocator")
193 pub fn has_global_allocator(&self, dep_graph: &DepGraph) -> bool {
194 let dep_node = self.metadata_dep_node(GlobalMetaDataKind::Krate);
196 .has_global_allocator
197 .get(dep_graph, dep_node)
201 pub fn has_default_lib_allocator(&self, dep_graph: &DepGraph) -> bool {
202 let dep_node = self.metadata_dep_node(GlobalMetaDataKind::Krate);
204 .has_default_lib_allocator
205 .get(dep_graph, dep_node)
209 pub fn is_panic_runtime(&self, dep_graph: &DepGraph) -> bool {
210 let attrs = self.get_item_attrs(CRATE_DEF_INDEX, dep_graph);
211 attr::contains_name(&attrs, "panic_runtime")
214 pub fn needs_panic_runtime(&self, dep_graph: &DepGraph) -> bool {
215 let attrs = self.get_item_attrs(CRATE_DEF_INDEX, dep_graph);
216 attr::contains_name(&attrs, "needs_panic_runtime")
219 pub fn is_compiler_builtins(&self, dep_graph: &DepGraph) -> bool {
220 let attrs = self.get_item_attrs(CRATE_DEF_INDEX, dep_graph);
221 attr::contains_name(&attrs, "compiler_builtins")
224 pub fn is_sanitizer_runtime(&self, dep_graph: &DepGraph) -> bool {
225 let attrs = self.get_item_attrs(CRATE_DEF_INDEX, dep_graph);
226 attr::contains_name(&attrs, "sanitizer_runtime")
229 pub fn is_profiler_runtime(&self, dep_graph: &DepGraph) -> bool {
230 let attrs = self.get_item_attrs(CRATE_DEF_INDEX, dep_graph);
231 attr::contains_name(&attrs, "profiler_runtime")
234 pub fn is_no_builtins(&self, dep_graph: &DepGraph) -> bool {
235 let attrs = self.get_item_attrs(CRATE_DEF_INDEX, dep_graph);
236 attr::contains_name(&attrs, "no_builtins")
239 pub fn panic_strategy(&self, dep_graph: &DepGraph) -> PanicStrategy {
240 let dep_node = self.metadata_dep_node(GlobalMetaDataKind::Krate);
243 .get(dep_graph, dep_node)