/
creader.rs
352 lines (318 loc) · 11.2 KB
/
creader.rs
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Validates all used crates and extern libraries and loads their metadata
use metadata::cstore;
use metadata::decoder;
use metadata::filesearch::FileSearch;
use metadata::loader;
use std::hashmap::HashMap;
use syntax::ast;
use std::vec;
use syntax::attr;
use syntax::attr::AttrMetaMethods;
use syntax::codemap::{Span, dummy_sp};
use syntax::diagnostic::span_handler;
use syntax::parse::token;
use syntax::parse::token::ident_interner;
use syntax::visit;
// Traverses an AST, reading all the information about use'd crates and extern
// libraries necessary for later resolving, typechecking, linking, etc.
pub fn read_crates(diag: @mut span_handler,
crate: &ast::Crate,
cstore: @mut cstore::CStore,
filesearch: @FileSearch,
os: loader::Os,
statik: bool,
intr: @ident_interner) {
let e = @mut Env {
diag: diag,
filesearch: filesearch,
cstore: cstore,
os: os,
statik: statik,
crate_cache: @mut ~[],
next_crate_num: 1,
intr: intr
};
let mut v = ReadCrateVisitor{ e:e };
visit_crate(e, crate);
visit::walk_crate(&mut v, crate, ());
dump_crates(*e.crate_cache);
warn_if_multiple_versions(e, diag, *e.crate_cache);
}
struct ReadCrateVisitor { e:@mut Env }
impl visit::Visitor<()> for ReadCrateVisitor {
fn visit_view_item(&mut self, a:&ast::view_item, _:()) {
visit_view_item(self.e, a);
visit::walk_view_item(self, a, ());
}
fn visit_item(&mut self, a:@ast::item, _:()) {
visit_item(self.e, a);
visit::walk_item(self, a, ());
}
}
#[deriving(Clone)]
struct cache_entry {
cnum: int,
span: Span,
hash: @str,
metas: @~[@ast::MetaItem]
}
fn dump_crates(crate_cache: &[cache_entry]) {
debug2!("resolved crates:");
for entry in crate_cache.iter() {
debug2!("cnum: {:?}", entry.cnum);
debug2!("span: {:?}", entry.span);
debug2!("hash: {:?}", entry.hash);
}
}
fn warn_if_multiple_versions(e: @mut Env,
diag: @mut span_handler,
crate_cache: &[cache_entry]) {
if crate_cache.len() != 0u {
let name = loader::crate_name_from_metas(
*crate_cache[crate_cache.len() - 1].metas
);
let (matches, non_matches) = crate_cache.partitioned(|entry|
name == loader::crate_name_from_metas(*entry.metas));
assert!(!matches.is_empty());
if matches.len() != 1u {
diag.handler().warn(
format!("using multiple versions of crate `{}`", name));
for match_ in matches.iter() {
diag.span_note(match_.span, "used here");
let attrs = ~[
attr::mk_attr(attr::mk_list_item(@"link",
(*match_.metas).clone()))
];
loader::note_linkage_attrs(e.intr, diag, attrs);
}
}
warn_if_multiple_versions(e, diag, non_matches);
}
}
struct Env {
diag: @mut span_handler,
filesearch: @FileSearch,
cstore: @mut cstore::CStore,
os: loader::Os,
statik: bool,
crate_cache: @mut ~[cache_entry],
next_crate_num: ast::CrateNum,
intr: @ident_interner
}
fn visit_crate(e: &Env, c: &ast::Crate) {
let cstore = e.cstore;
for a in c.attrs.iter().filter(|m| "link_args" == m.name()) {
match a.value_str() {
Some(ref linkarg) => {
cstore::add_used_link_args(cstore, *linkarg);
}
None => {/* fallthrough */ }
}
}
}
fn visit_view_item(e: @mut Env, i: &ast::view_item) {
match i.node {
ast::view_item_extern_mod(ident, path_opt, ref meta_items, id) => {
let ident = token::ident_to_str(&ident);
let meta_items = match path_opt {
None => meta_items.clone(),
Some((p, _path_str_style)) => {
let p_path = Path(p);
match p_path.filestem() {
Some(s) =>
vec::append(
~[attr::mk_name_value_item_str(@"package_id", p),
attr::mk_name_value_item_str(@"name", s.to_managed())],
*meta_items),
None => e.diag.span_bug(i.span, "Bad package path in `extern mod` item")
}
}
};
debug2!("resolving extern mod stmt. ident: {:?}, meta: {:?}",
ident, meta_items);
let cnum = resolve_crate(e,
ident,
meta_items,
@"",
i.span);
cstore::add_extern_mod_stmt_cnum(e.cstore, id, cnum);
}
_ => ()
}
}
fn visit_item(e: &Env, i: @ast::item) {
match i.node {
ast::item_foreign_mod(ref fm) => {
if fm.abis.is_rust() || fm.abis.is_intrinsic() {
return;
}
let cstore = e.cstore;
let mut already_added = false;
let link_args = i.attrs.iter()
.filter_map(|at| if "link_args" == at.name() {Some(at)} else {None})
.collect::<~[&ast::Attribute]>();
match fm.sort {
ast::named => {
let link_name = i.attrs.iter()
.find(|at| "link_name" == at.name())
.and_then(|at| at.value_str());
let foreign_name = match link_name {
Some(nn) => {
if nn.is_empty() {
e.diag.span_fatal(
i.span,
"empty #[link_name] not allowed; use \
#[nolink].");
}
nn
}
None => token::ident_to_str(&i.ident)
};
if !attr::contains_name(i.attrs, "nolink") {
already_added =
!cstore::add_used_library(cstore, foreign_name);
}
if !link_args.is_empty() && already_added {
e.diag.span_fatal(i.span, ~"library '" + foreign_name +
"' already added: can't specify link_args.");
}
}
ast::anonymous => { /* do nothing */ }
}
for m in link_args.iter() {
match m.value_str() {
Some(linkarg) => {
cstore::add_used_link_args(cstore, linkarg);
}
None => { /* fallthrough */ }
}
}
}
_ => { }
}
}
fn metas_with(ident: @str, key: @str, mut metas: ~[@ast::MetaItem])
-> ~[@ast::MetaItem] {
// Check if key isn't there yet.
if !attr::contains_name(metas, key) {
metas.push(attr::mk_name_value_item_str(key, ident));
}
metas
}
fn metas_with_ident(ident: @str, metas: ~[@ast::MetaItem])
-> ~[@ast::MetaItem] {
metas_with(ident, @"name", metas)
}
fn existing_match(e: &Env, metas: &[@ast::MetaItem], hash: &str)
-> Option<int> {
for c in e.crate_cache.iter() {
if loader::metadata_matches(*c.metas, metas)
&& (hash.is_empty() || c.hash.as_slice() == hash) {
return Some(c.cnum);
}
}
return None;
}
fn resolve_crate(e: @mut Env,
ident: @str,
metas: ~[@ast::MetaItem],
hash: @str,
span: Span)
-> ast::CrateNum {
let metas = metas_with_ident(ident, metas);
match existing_match(e, metas, hash) {
None => {
let load_ctxt = loader::Context {
diag: e.diag,
filesearch: e.filesearch,
span: span,
ident: ident,
metas: metas,
hash: hash,
os: e.os,
is_static: e.statik,
intr: e.intr
};
let (lident, ldata) = loader::load_library_crate(&load_ctxt);
let cfilename = Path(lident);
let cdata = ldata;
let attrs = decoder::get_crate_attributes(cdata);
let linkage_metas = attr::find_linkage_metas(attrs);
let hash = decoder::get_crate_hash(cdata);
// Claim this crate number and cache it
let cnum = e.next_crate_num;
e.crate_cache.push(cache_entry {
cnum: cnum,
span: span,
hash: hash,
metas: @linkage_metas
});
e.next_crate_num += 1;
// Now resolve the crates referenced by this crate
let cnum_map = resolve_crate_deps(e, cdata);
let cname =
match attr::last_meta_item_value_str_by_name(load_ctxt.metas,
"name") {
Some(v) => v,
None => ident
};
let cmeta = @cstore::crate_metadata {
name: cname,
data: cdata,
cnum_map: cnum_map,
cnum: cnum
};
let cstore = e.cstore;
cstore::set_crate_data(cstore, cnum, cmeta);
cstore::add_used_crate_file(cstore, &cfilename);
return cnum;
}
Some(cnum) => {
return cnum;
}
}
}
// Go through the crate metadata and load any crates that it references
fn resolve_crate_deps(e: @mut Env, cdata: @~[u8]) -> cstore::cnum_map {
debug2!("resolving deps of external crate");
// The map from crate numbers in the crate we're resolving to local crate
// numbers
let mut cnum_map = HashMap::new();
let r = decoder::get_crate_deps(cdata);
for dep in r.iter() {
let extrn_cnum = dep.cnum;
let cname_str = token::ident_to_str(&dep.name);
let cmetas = metas_with(dep.vers, @"vers", ~[]);
debug2!("resolving dep crate {} ver: {} hash: {}",
cname_str, dep.vers, dep.hash);
match existing_match(e,
metas_with_ident(cname_str, cmetas.clone()),
dep.hash) {
Some(local_cnum) => {
debug2!("already have it");
// We've already seen this crate
cnum_map.insert(extrn_cnum, local_cnum);
}
None => {
debug2!("need to load it");
// This is a new one so we've got to load it
// FIXME (#2404): Need better error reporting than just a bogus
// span.
let fake_span = dummy_sp();
let local_cnum = resolve_crate(e, cname_str, cmetas, dep.hash,
fake_span);
cnum_map.insert(extrn_cnum, local_cnum);
}
}
}
return @mut cnum_map;
}