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use hir::def_id::{DefId, LOCAL_CRATE};
use ich::StableHashingContext;
use rustc_data_structures::stable_hasher::{StableHasher, HashStable,
StableHasherResult};
use std::cmp;
use std::mem;
use ty;
use ty::subst::Substs;
#[derive(Eq, PartialEq, Debug, Copy, Clone, RustcEncodable, RustcDecodable)]
pub enum SymbolExportLevel {
C,
Rust,
}
impl_stable_hash_for!(enum self::SymbolExportLevel {
C,
Rust
});
impl SymbolExportLevel {
pub fn is_below_threshold(self, threshold: SymbolExportLevel) -> bool {
if threshold == SymbolExportLevel::Rust {
true
} else {
self == SymbolExportLevel::C
}
}
}
#[derive(Eq, PartialEq, Debug, Copy, Clone, RustcEncodable, RustcDecodable)]
pub enum ExportedSymbol<'tcx> {
NonGeneric(DefId),
Generic(DefId, &'tcx Substs<'tcx>),
NoDefId(ty::SymbolName),
}
impl<'tcx> ExportedSymbol<'tcx> {
pub fn symbol_name(&self,
tcx: ty::TyCtxt<'_, 'tcx, '_>)
-> ty::SymbolName {
match *self {
ExportedSymbol::NonGeneric(def_id) => {
tcx.symbol_name(ty::Instance::mono(tcx, def_id))
}
ExportedSymbol::Generic(def_id, substs) => {
tcx.symbol_name(ty::Instance::new(def_id, substs))
}
ExportedSymbol::NoDefId(symbol_name) => {
symbol_name
}
}
}
pub fn compare_stable(&self,
tcx: ty::TyCtxt<'_, 'tcx, '_>,
other: &ExportedSymbol<'tcx>)
-> cmp::Ordering {
match *self {
ExportedSymbol::NonGeneric(self_def_id) => match *other {
ExportedSymbol::NonGeneric(other_def_id) => {
tcx.def_path_hash(self_def_id).cmp(&tcx.def_path_hash(other_def_id))
}
ExportedSymbol::Generic(..) |
ExportedSymbol::NoDefId(_) => {
cmp::Ordering::Less
}
}
ExportedSymbol::Generic(..) => match *other {
ExportedSymbol::NonGeneric(_) => {
cmp::Ordering::Greater
}
ExportedSymbol::Generic(..) => {
self.symbol_name(tcx).cmp(&other.symbol_name(tcx))
}
ExportedSymbol::NoDefId(_) => {
cmp::Ordering::Less
}
}
ExportedSymbol::NoDefId(self_symbol_name) => match *other {
ExportedSymbol::NonGeneric(_) |
ExportedSymbol::Generic(..) => {
cmp::Ordering::Greater
}
ExportedSymbol::NoDefId(ref other_symbol_name) => {
self_symbol_name.cmp(other_symbol_name)
}
}
}
}
}
pub fn metadata_symbol_name(tcx: ty::TyCtxt) -> String {
format!("rust_metadata_{}_{}",
tcx.original_crate_name(LOCAL_CRATE),
tcx.crate_disambiguator(LOCAL_CRATE).to_fingerprint().to_hex())
}
impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for ExportedSymbol<'gcx> {
fn hash_stable<W: StableHasherResult>(&self,
hcx: &mut StableHashingContext<'a>,
hasher: &mut StableHasher<W>) {
mem::discriminant(self).hash_stable(hcx, hasher);
match *self {
ExportedSymbol::NonGeneric(def_id) => {
def_id.hash_stable(hcx, hasher);
}
ExportedSymbol::Generic(def_id, substs) => {
def_id.hash_stable(hcx, hasher);
substs.hash_stable(hcx, hasher);
}
ExportedSymbol::NoDefId(symbol_name) => {
symbol_name.hash_stable(hcx, hasher);
}
}
}
}