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native_libs.rs
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native_libs.rs
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// Copyright 2017 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.
use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::hir;
use rustc::middle::cstore::{self, NativeLibrary};
use rustc::session::Session;
use rustc::ty::TyCtxt;
use rustc::util::nodemap::FxHashSet;
use rustc_target::spec::abi::Abi;
use syntax::attr;
use syntax::codemap::Span;
use syntax::feature_gate::{self, GateIssue};
use syntax::symbol::Symbol;
pub fn collect<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) -> Vec<NativeLibrary> {
let mut collector = Collector {
tcx,
libs: Vec::new(),
};
tcx.hir.krate().visit_all_item_likes(&mut collector);
collector.process_command_line();
return collector.libs
}
pub fn relevant_lib(sess: &Session, lib: &NativeLibrary) -> bool {
match lib.cfg {
Some(ref cfg) => attr::cfg_matches(cfg, &sess.parse_sess, None),
None => true,
}
}
struct Collector<'a, 'tcx: 'a> {
tcx: TyCtxt<'a, 'tcx, 'tcx>,
libs: Vec<NativeLibrary>,
}
impl<'a, 'tcx> ItemLikeVisitor<'tcx> for Collector<'a, 'tcx> {
fn visit_item(&mut self, it: &'tcx hir::Item) {
let fm = match it.node {
hir::ItemKind::ForeignMod(ref fm) => fm,
_ => return,
};
if fm.abi == Abi::Rust ||
fm.abi == Abi::RustIntrinsic ||
fm.abi == Abi::PlatformIntrinsic {
return
}
// Process all of the #[link(..)]-style arguments
for m in it.attrs.iter().filter(|a| a.check_name("link")) {
let items = match m.meta_item_list() {
Some(item) => item,
None => continue,
};
let mut lib = NativeLibrary {
name: None,
kind: cstore::NativeUnknown,
cfg: None,
foreign_module: Some(self.tcx.hir.local_def_id(it.id)),
wasm_import_module: None,
};
let mut kind_specified = false;
for item in items.iter() {
if item.check_name("kind") {
kind_specified = true;
let kind = match item.value_str() {
Some(name) => name,
None => continue, // skip like historical compilers
};
lib.kind = match &kind.as_str()[..] {
"static" => cstore::NativeStatic,
"static-nobundle" => cstore::NativeStaticNobundle,
"dylib" => cstore::NativeUnknown,
"framework" => cstore::NativeFramework,
k => {
struct_span_err!(self.tcx.sess, m.span, E0458,
"unknown kind: `{}`", k)
.span_label(item.span, "unknown kind").emit();
cstore::NativeUnknown
}
};
} else if item.check_name("name") {
lib.name = item.value_str();
} else if item.check_name("cfg") {
let cfg = match item.meta_item_list() {
Some(list) => list,
None => continue, // skip like historical compilers
};
if cfg.is_empty() {
self.tcx.sess.span_err(
item.span(),
"`cfg()` must have an argument",
);
} else if let cfg @ Some(..) = cfg[0].meta_item() {
lib.cfg = cfg.cloned();
} else {
self.tcx.sess.span_err(cfg[0].span(), "invalid argument for `cfg(..)`");
}
} else if item.check_name("wasm_import_module") {
match item.value_str() {
Some(s) => lib.wasm_import_module = Some(s),
None => {
let msg = "must be of the form #[link(wasm_import_module = \"...\")]";
self.tcx.sess.span_err(item.span(), msg);
}
}
} else {
// currently, like past compilers, ignore unknown
// directives here.
}
}
// In general we require #[link(name = "...")] but we allow
// #[link(wasm_import_module = "...")] without the `name`.
let requires_name = kind_specified || lib.wasm_import_module.is_none();
if lib.name.is_none() && requires_name {
struct_span_err!(self.tcx.sess, m.span, E0459,
"#[link(...)] specified without \
`name = \"foo\"`")
.span_label(m.span, "missing `name` argument")
.emit();
}
self.register_native_lib(Some(m.span), lib);
}
}
fn visit_trait_item(&mut self, _it: &'tcx hir::TraitItem) {}
fn visit_impl_item(&mut self, _it: &'tcx hir::ImplItem) {}
}
impl<'a, 'tcx> Collector<'a, 'tcx> {
fn register_native_lib(&mut self, span: Option<Span>, lib: NativeLibrary) {
if lib.name.as_ref().map(|s| s.as_str().is_empty()).unwrap_or(false) {
match span {
Some(span) => {
struct_span_err!(self.tcx.sess, span, E0454,
"#[link(name = \"\")] given with empty name")
.span_label(span, "empty name given")
.emit();
}
None => {
self.tcx.sess.err("empty library name given via `-l`");
}
}
return
}
let is_osx = self.tcx.sess.target.target.options.is_like_osx;
if lib.kind == cstore::NativeFramework && !is_osx {
let msg = "native frameworks are only available on macOS targets";
match span {
Some(span) => span_err!(self.tcx.sess, span, E0455, "{}", msg),
None => self.tcx.sess.err(msg),
}
}
if lib.cfg.is_some() && !self.tcx.features().link_cfg {
feature_gate::emit_feature_err(&self.tcx.sess.parse_sess,
"link_cfg",
span.unwrap(),
GateIssue::Language,
"is feature gated");
}
if lib.kind == cstore::NativeStaticNobundle &&
!self.tcx.features().static_nobundle {
feature_gate::emit_feature_err(&self.tcx.sess.parse_sess,
"static_nobundle",
span.unwrap(),
GateIssue::Language,
"kind=\"static-nobundle\" is feature gated");
}
self.libs.push(lib);
}
// Process libs passed on the command line
fn process_command_line(&mut self) {
// First, check for errors
let mut renames = FxHashSet();
for &(ref name, ref new_name, _) in &self.tcx.sess.opts.libs {
if let &Some(ref new_name) = new_name {
let any_duplicate = self.libs
.iter()
.filter_map(|lib| lib.name.as_ref())
.any(|n| n == name);
if new_name.is_empty() {
self.tcx.sess.err(
&format!("an empty renaming target was specified for library `{}`",name));
} else if !any_duplicate {
self.tcx.sess.err(&format!("renaming of the library `{}` was specified, \
however this crate contains no #[link(...)] \
attributes referencing this library.", name));
} else if renames.contains(name) {
self.tcx.sess.err(&format!("multiple renamings were \
specified for library `{}` .",
name));
} else {
renames.insert(name);
}
}
}
// Update kind and, optionally, the name of all native libaries
// (there may be more than one) with the specified name.
for &(ref name, ref new_name, kind) in &self.tcx.sess.opts.libs {
let mut found = false;
for lib in self.libs.iter_mut() {
let lib_name = match lib.name {
Some(n) => n,
None => continue,
};
if lib_name == name as &str {
let mut changed = false;
if let Some(k) = kind {
lib.kind = k;
changed = true;
}
if let &Some(ref new_name) = new_name {
lib.name = Some(Symbol::intern(new_name));
changed = true;
}
if !changed {
let msg = format!("redundant linker flag specified for \
library `{}`", name);
self.tcx.sess.warn(&msg);
}
found = true;
}
}
if !found {
// Add if not found
let new_name = new_name.as_ref().map(|s| &**s); // &Option<String> -> Option<&str>
let lib = NativeLibrary {
name: Some(Symbol::intern(new_name.unwrap_or(name))),
kind: if let Some(k) = kind { k } else { cstore::NativeUnknown },
cfg: None,
foreign_module: None,
wasm_import_module: None,
};
self.register_native_lib(None, lib);
}
}
}
}