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use rustc::hir::def_id::LOCAL_CRATE;
use rustc::dep_graph::{DepNode, DepConstructor};
use rustc::mir::mono::CodegenUnitNameBuilder;
use rustc::ty::TyCtxt;
use syntax::ast;
use rustc::ich::{ATTR_PARTITION_REUSED, ATTR_PARTITION_CODEGENED};
const MODULE: &'static str = "module";
const CFG: &'static str = "cfg";
#[derive(Debug, PartialEq, Clone, Copy)]
enum Disposition { Reused, Codegened }
pub fn assert_module_sources<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
tcx.dep_graph.with_ignore(|| {
if tcx.sess.opts.incremental.is_none() {
return;
}
let ams = AssertModuleSource { tcx };
for attr in &tcx.hir.krate().attrs {
ams.check_attr(attr);
}
})
}
struct AssertModuleSource<'a, 'tcx: 'a> {
tcx: TyCtxt<'a, 'tcx, 'tcx>
}
impl<'a, 'tcx> AssertModuleSource<'a, 'tcx> {
fn check_attr(&self, attr: &ast::Attribute) {
let disposition = if attr.check_name(ATTR_PARTITION_REUSED) {
Disposition::Reused
} else if attr.check_name(ATTR_PARTITION_CODEGENED) {
Disposition::Codegened
} else {
return;
};
if !self.check_config(attr) {
debug!("check_attr: config does not match, ignoring attr");
return;
}
let user_path = self.field(attr, MODULE).as_str().to_string();
let crate_name = self.tcx.crate_name(LOCAL_CRATE).as_str().to_string();
if !user_path.starts_with(&crate_name) {
let msg = format!("Found malformed codegen unit name `{}`. \
Codegen units names must always start with the name of the \
crate (`{}` in this case).", user_path, crate_name);
self.tcx.sess.span_fatal(attr.span, &msg);
}
let (user_path, cgu_special_suffix) = if let Some(index) = user_path.rfind(".") {
(&user_path[..index], Some(&user_path[index + 1 ..]))
} else {
(&user_path[..], None)
};
let mut cgu_path_components = user_path.split('-').collect::<Vec<_>>();
assert_eq!(cgu_path_components.remove(0), crate_name);
let cgu_name_builder = &mut CodegenUnitNameBuilder::new(self.tcx);
let cgu_name = cgu_name_builder.build_cgu_name(LOCAL_CRATE,
cgu_path_components,
cgu_special_suffix);
debug!("mapping '{}' to cgu name '{}'", self.field(attr, MODULE), cgu_name);
let dep_node = DepNode::new(self.tcx,
DepConstructor::CompileCodegenUnit(cgu_name));
if let Some(loaded_from_cache) = self.tcx.dep_graph.was_loaded_from_cache(&dep_node) {
match (disposition, loaded_from_cache) {
(Disposition::Reused, false) => {
self.tcx.sess.span_err(
attr.span,
&format!("expected module named `{}` to be Reused but is Codegened",
user_path));
}
(Disposition::Codegened, true) => {
self.tcx.sess.span_err(
attr.span,
&format!("expected module named `{}` to be Codegened but is Reused",
user_path));
}
(Disposition::Reused, true) |
(Disposition::Codegened, false) => {
}
}
} else {
let available_cgus = self.tcx
.collect_and_partition_mono_items(LOCAL_CRATE)
.1
.iter()
.map(|cgu| format!("{}", cgu.name()))
.collect::<Vec<String>>()
.join(", ");
self.tcx.sess.span_err(attr.span,
&format!("no module named `{}` (mangled: {}).\nAvailable modules: {}",
user_path,
cgu_name,
available_cgus));
}
}
fn field(&self, attr: &ast::Attribute, name: &str) -> ast::Name {
for item in attr.meta_item_list().unwrap_or_else(Vec::new) {
if item.check_name(name) {
if let Some(value) = item.value_str() {
return value;
} else {
self.tcx.sess.span_fatal(
item.span,
&format!("associated value expected for `{}`", name));
}
}
}
self.tcx.sess.span_fatal(
attr.span,
&format!("no field `{}`", name));
}
fn check_config(&self, attr: &ast::Attribute) -> bool {
let config = &self.tcx.sess.parse_sess.config;
let value = self.field(attr, CFG);
debug!("check_config(config={:?}, value={:?})", config, value);
if config.iter().any(|&(name, _)| name == value) {
debug!("check_config: matched");
return true;
}
debug!("check_config: no match found");
return false;
}
}