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 #![allow(non_camel_case_types)]
13 // The crate store - a central repo for information collected about external
14 // crates and libraries
16 pub use self::MetadataBlob::*;
17 pub use self::LinkagePreference::*;
18 pub use self::NativeLibraryKind::*;
21 use metadata::decoder;
23 use session::search_paths::PathKind;
24 use util::nodemap::{FnvHashMap, NodeMap};
26 use std::cell::RefCell;
30 use syntax::codemap::Span;
31 use syntax::parse::token::IdentInterner;
33 // A map from external crate numbers (as decoded from some crate file) to
34 // local crate numbers (as generated during this session). Each external
35 // crate may refer to types in other external crates, and each has their
37 pub type cnum_map = FnvHashMap<ast::CrateNum, ast::CrateNum>;
39 pub enum MetadataBlob {
41 MetadataArchive(loader::ArchiveMetadata),
44 pub struct crate_metadata {
46 pub data: MetadataBlob,
47 pub cnum_map: cnum_map,
48 pub cnum: ast::CrateNum,
52 #[derive(Copy, Debug, PartialEq, Clone)]
53 pub enum LinkagePreference {
58 #[derive(Copy, Clone, PartialEq, FromPrimitive)]
59 pub enum NativeLibraryKind {
60 NativeStatic, // native static library (.a archive)
61 NativeFramework, // OSX-specific
62 NativeUnknown, // default way to specify a dynamic library
65 // Where a crate came from on the local filesystem. One of these two options
67 #[derive(PartialEq, Clone)]
68 pub struct CrateSource {
69 pub dylib: Option<(Path, PathKind)>,
70 pub rlib: Option<(Path, PathKind)>,
71 pub cnum: ast::CrateNum,
75 metas: RefCell<FnvHashMap<ast::CrateNum, Rc<crate_metadata>>>,
76 /// Map from NodeId's of local extern crate statements to crate numbers
77 extern_mod_crate_map: RefCell<NodeMap<ast::CrateNum>>,
78 used_crate_sources: RefCell<Vec<CrateSource>>,
79 used_libraries: RefCell<Vec<(String, NativeLibraryKind)>>,
80 used_link_args: RefCell<Vec<String>>,
81 pub intr: Rc<IdentInterner>,
85 pub fn new(intr: Rc<IdentInterner>) -> CStore {
87 metas: RefCell::new(FnvHashMap()),
88 extern_mod_crate_map: RefCell::new(FnvHashMap()),
89 used_crate_sources: RefCell::new(Vec::new()),
90 used_libraries: RefCell::new(Vec::new()),
91 used_link_args: RefCell::new(Vec::new()),
96 pub fn next_crate_num(&self) -> ast::CrateNum {
97 self.metas.borrow().len() as ast::CrateNum + 1
100 pub fn get_crate_data(&self, cnum: ast::CrateNum) -> Rc<crate_metadata> {
101 (*self.metas.borrow())[cnum].clone()
104 pub fn get_crate_hash(&self, cnum: ast::CrateNum) -> Svh {
105 let cdata = self.get_crate_data(cnum);
106 decoder::get_crate_hash(cdata.data())
109 pub fn set_crate_data(&self, cnum: ast::CrateNum, data: Rc<crate_metadata>) {
110 self.metas.borrow_mut().insert(cnum, data);
113 pub fn iter_crate_data<I>(&self, mut i: I) where
114 I: FnMut(ast::CrateNum, &crate_metadata),
116 for (&k, v) in &*self.metas.borrow() {
121 /// Like `iter_crate_data`, but passes source paths (if available) as well.
122 pub fn iter_crate_data_origins<I>(&self, mut i: I) where
123 I: FnMut(ast::CrateNum, &crate_metadata, Option<CrateSource>),
125 for (&k, v) in &*self.metas.borrow() {
126 let origin = self.get_used_crate_source(k);
127 origin.as_ref().map(|cs| { assert!(k == cs.cnum); });
132 pub fn add_used_crate_source(&self, src: CrateSource) {
133 let mut used_crate_sources = self.used_crate_sources.borrow_mut();
134 if !used_crate_sources.contains(&src) {
135 used_crate_sources.push(src);
139 pub fn get_used_crate_source(&self, cnum: ast::CrateNum)
140 -> Option<CrateSource> {
141 self.used_crate_sources.borrow_mut()
142 .iter().find(|source| source.cnum == cnum)
143 .map(|source| source.clone())
146 pub fn reset(&self) {
147 self.metas.borrow_mut().clear();
148 self.extern_mod_crate_map.borrow_mut().clear();
149 self.used_crate_sources.borrow_mut().clear();
150 self.used_libraries.borrow_mut().clear();
151 self.used_link_args.borrow_mut().clear();
154 // This method is used when generating the command line to pass through to
155 // system linker. The linker expects undefined symbols on the left of the
156 // command line to be defined in libraries on the right, not the other way
157 // around. For more info, see some comments in the add_used_library function
160 // In order to get this left-to-right dependency ordering, we perform a
161 // topological sort of all crates putting the leaves at the right-most
163 pub fn get_used_crates(&self, prefer: LinkagePreference)
164 -> Vec<(ast::CrateNum, Option<Path>)> {
165 let mut ordering = Vec::new();
166 fn visit(cstore: &CStore, cnum: ast::CrateNum,
167 ordering: &mut Vec<ast::CrateNum>) {
168 if ordering.contains(&cnum) { return }
169 let meta = cstore.get_crate_data(cnum);
170 for (_, &dep) in &meta.cnum_map {
171 visit(cstore, dep, ordering);
175 for (&num, _) in &*self.metas.borrow() {
176 visit(self, num, &mut ordering);
179 let mut libs = self.used_crate_sources.borrow()
181 .map(|src| (src.cnum, match prefer {
182 RequireDynamic => src.dylib.clone().map(|p| p.0),
183 RequireStatic => src.rlib.clone().map(|p| p.0),
185 .collect::<Vec<_>>();
186 libs.sort_by(|&(a, _), &(b, _)| {
187 ordering.position_elem(&a).cmp(&ordering.position_elem(&b))
192 pub fn add_used_library(&self, lib: String, kind: NativeLibraryKind) {
193 assert!(!lib.is_empty());
194 self.used_libraries.borrow_mut().push((lib, kind));
197 pub fn get_used_libraries<'a>(&'a self)
198 -> &'a RefCell<Vec<(String,
199 NativeLibraryKind)>> {
203 pub fn add_used_link_args(&self, args: &str) {
204 for s in args.split(' ').filter(|s| !s.is_empty()) {
205 self.used_link_args.borrow_mut().push(s.to_string());
209 pub fn get_used_link_args<'a>(&'a self) -> &'a RefCell<Vec<String> > {
213 pub fn add_extern_mod_stmt_cnum(&self,
214 emod_id: ast::NodeId,
215 cnum: ast::CrateNum) {
216 self.extern_mod_crate_map.borrow_mut().insert(emod_id, cnum);
219 pub fn find_extern_mod_stmt_cnum(&self, emod_id: ast::NodeId)
220 -> Option<ast::CrateNum> {
221 self.extern_mod_crate_map.borrow().get(&emod_id).map(|x| *x)
225 impl crate_metadata {
226 pub fn data<'a>(&'a self) -> &'a [u8] { self.data.as_slice() }
227 pub fn name(&self) -> String { decoder::get_crate_name(self.data()) }
228 pub fn hash(&self) -> Svh { decoder::get_crate_hash(self.data()) }
232 pub fn as_slice<'a>(&'a self) -> &'a [u8] {
233 let slice = match *self {
234 MetadataVec(ref vec) => vec.as_slice(),
235 MetadataArchive(ref ar) => ar.as_slice(),
238 &[] // corrupt metadata
240 let len = (((slice[0] as u32) << 24) |
241 ((slice[1] as u32) << 16) |
242 ((slice[2] as u32) << 8) |
243 ((slice[3] as u32) << 0)) as uint;
244 if len + 4 <= slice.len() {
247 &[] // corrupt or old metadata