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|
use std::assert_matches::debug_assert_matches;
use rustc_abi::IntegerType;
use rustc_data_structures::stable_hasher::StableHasher;
use rustc_hashes::Hash128;
use rustc_hir::def::DefKind;
use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
use rustc_span::symbol::{Symbol, sym};
trait AbiHashStable<'tcx> {
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher);
}
macro_rules! default_hash_impl {
($($t:ty,)+) => {
$(impl<'tcx> AbiHashStable<'tcx> for $t {
#[inline]
fn abi_hash(&self, _tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
::std::hash::Hash::hash(self, hasher);
}
})*
};
}
default_hash_impl! { i8, i16, i32, i64, i128, isize, u8, u16, u32, u64, u128, usize, }
impl<'tcx> AbiHashStable<'tcx> for bool {
#[inline]
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
(if *self { 1u8 } else { 0u8 }).abi_hash(tcx, hasher);
}
}
impl<'tcx> AbiHashStable<'tcx> for str {
#[inline]
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
self.as_bytes().abi_hash(tcx, hasher);
}
}
impl<'tcx> AbiHashStable<'tcx> for String {
#[inline]
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
self[..].abi_hash(tcx, hasher);
}
}
impl<'tcx> AbiHashStable<'tcx> for Symbol {
#[inline]
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
self.as_str().abi_hash(tcx, hasher);
}
}
impl<'tcx, T: AbiHashStable<'tcx>> AbiHashStable<'tcx> for [T] {
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
self.len().abi_hash(tcx, hasher);
for item in self {
item.abi_hash(tcx, hasher);
}
}
}
impl<'tcx> AbiHashStable<'tcx> for Ty<'tcx> {
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
match self.kind() {
ty::Bool => sym::bool.abi_hash(tcx, hasher),
ty::Char => sym::char.abi_hash(tcx, hasher),
ty::Int(int_ty) => int_ty.name_str().abi_hash(tcx, hasher),
ty::Uint(uint_ty) => uint_ty.name_str().abi_hash(tcx, hasher),
ty::Float(float_ty) => float_ty.name_str().abi_hash(tcx, hasher),
ty::Adt(adt_def, args) => {
adt_def.is_struct().abi_hash(tcx, hasher);
adt_def.is_enum().abi_hash(tcx, hasher);
adt_def.is_union().abi_hash(tcx, hasher);
if let Some(align) = adt_def.repr().align {
align.bits().abi_hash(tcx, hasher);
}
if let Some(integer) = adt_def.repr().int {
match integer {
IntegerType::Pointer(sign) => sign.abi_hash(tcx, hasher),
IntegerType::Fixed(integer, sign) => {
integer.int_ty_str().abi_hash(tcx, hasher);
sign.abi_hash(tcx, hasher);
}
}
}
if let Some(pack) = adt_def.repr().pack {
pack.bits().abi_hash(tcx, hasher);
}
adt_def.repr().c().abi_hash(tcx, hasher);
for variant in adt_def.variants() {
variant.name.abi_hash(tcx, hasher);
for field in &variant.fields {
field.name.abi_hash(tcx, hasher);
let field_ty = tcx.type_of(field.did).instantiate_identity();
field_ty.abi_hash(tcx, hasher);
}
}
args.abi_hash(tcx, hasher);
}
ty::Tuple(args) if args.len() == 0 => {}
// FIXME: Not yet supported.
ty::Foreign(_)
| ty::Ref(_, _, _)
| ty::Str
| ty::Array(_, _)
| ty::Pat(_, _)
| ty::Slice(_)
| ty::RawPtr(_, _)
| ty::FnDef(_, _)
| ty::FnPtr(_, _)
| ty::Dynamic(_, _, _)
| ty::Closure(_, _)
| ty::CoroutineClosure(_, _)
| ty::Coroutine(_, _)
| ty::CoroutineWitness(_, _)
| ty::Never
| ty::Tuple(_)
| ty::Alias(_, _)
| ty::Param(_)
| ty::Bound(_, _)
| ty::Placeholder(_)
| ty::Infer(_)
| ty::UnsafeBinder(_) => unreachable!(),
ty::Error(_) => {}
}
}
}
impl<'tcx> AbiHashStable<'tcx> for ty::FnSig<'tcx> {
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
for ty in self.inputs_and_output {
ty.abi_hash(tcx, hasher);
}
self.safety.is_safe().abi_hash(tcx, hasher);
}
}
impl<'tcx> AbiHashStable<'tcx> for ty::GenericArg<'tcx> {
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
self.kind().abi_hash(tcx, hasher);
}
}
impl<'tcx> AbiHashStable<'tcx> for ty::GenericArgKind<'tcx> {
fn abi_hash(&self, tcx: TyCtxt<'tcx>, hasher: &mut StableHasher) {
match self {
ty::GenericArgKind::Type(t) => t.abi_hash(tcx, hasher),
ty::GenericArgKind::Lifetime(_) | ty::GenericArgKind::Const(_) => unimplemented!(),
}
}
}
pub(crate) fn compute_hash_of_export_fn<'tcx>(
tcx: TyCtxt<'tcx>,
instance: Instance<'tcx>,
) -> String {
let def_id = instance.def_id();
debug_assert_matches!(tcx.def_kind(def_id), DefKind::Fn | DefKind::AssocFn);
let args = instance.args;
let sig_ty = tcx.fn_sig(def_id).instantiate(tcx, args);
let sig_ty = tcx.instantiate_bound_regions_with_erased(sig_ty);
let hash = {
let mut hasher = StableHasher::new();
sig_ty.abi_hash(tcx, &mut hasher);
hasher.finish::<Hash128>()
};
hash.as_u128().to_string()
}
|
