bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Add Ty to ConstKind::Value

Browse source
This commit is contained in:
Boxy 2024-06-03 02:34:35 +01:00
parent 58feec9b85
commit a9702a6668
30 changed files with 180 additions and 186 deletions
Download patch file Download diff file Expand all files Collapse all files

70
compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs
View file

@ -693,42 +693,46 @@ fn push_const_param<'tcx>(tcx: TyCtxt<'tcx>, ct: ty::Const<'tcx>, output: &mut S
ty::ConstKind::Param(param) => {
write!(output, "{}", param.name)
}
// THISPR
_ => match { todo!() as Ty<'tcx> }.kind() {
ty::Int(ity) => {
let bits = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
let val = Integer::from_int_ty(&tcx, *ity).size().sign_extend(bits) as i128;
write!(output, "{val}")
}
ty::Uint(_) => {
let val = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
write!(output, "{val}")
}
ty::Bool => {
let val = ct.try_eval_bool(tcx, ty::ParamEnv::reveal_all()).unwrap();
write!(output, "{val}")
}
_ => {
// If we cannot evaluate the constant to a known type, we fall back
// to emitting a stable hash value of the constant. This isn't very pretty
// but we get a deterministic, virtually unique value for the constant.
//
// Let's only emit 64 bits of the hash value. That should be plenty for
// avoiding collisions and will make the emitted type names shorter.
let hash_short = tcx.with_stable_hashing_context(|mut hcx| {
let mut hasher = StableHasher::new();
let ct = ct.eval(tcx, ty::ParamEnv::reveal_all(), DUMMY_SP).unwrap();
hcx.while_hashing_spans(false, |hcx| ct.hash_stable(hcx, &mut hasher));
hasher.finish::<Hash64>()
});
ty::ConstKind::Value(ty, _) => {
match ty.kind() {
ty::Int(ity) => {
// FIXME: directly extract the bits from a valtree instead of evaluating an
// alreay evaluated `Const` in order to get the bits.
let bits = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
let val = Integer::from_int_ty(&tcx, *ity).size().sign_extend(bits) as i128;
write!(output, "{val}")
}
ty::Uint(_) => {
let val = ct.eval_bits(tcx, ty::ParamEnv::reveal_all());
write!(output, "{val}")
}
ty::Bool => {
let val = ct.try_eval_bool(tcx, ty::ParamEnv::reveal_all()).unwrap();
write!(output, "{val}")
}
_ => {
// If we cannot evaluate the constant to a known type, we fall back
// to emitting a stable hash value of the constant. This isn't very pretty
// but we get a deterministic, virtually unique value for the constant.
//
// Let's only emit 64 bits of the hash value. That should be plenty for
// avoiding collisions and will make the emitted type names shorter.
let hash_short = tcx.with_stable_hashing_context(|mut hcx| {
let mut hasher = StableHasher::new();
let ct = ct.eval(tcx, ty::ParamEnv::reveal_all(), DUMMY_SP).unwrap();
hcx.while_hashing_spans(false, |hcx| ct.hash_stable(hcx, &mut hasher));
hasher.finish::<Hash64>()
});
if cpp_like_debuginfo(tcx) {
write!(output, "CONST${hash_short:x}")
} else {
write!(output, "{{CONST#{hash_short:x}}}")
if cpp_like_debuginfo(tcx) {
write!(output, "CONST${hash_short:x}")
} else {
write!(output, "{{CONST#{hash_short:x}}}")
}
}
}
},
}
_ => bug!("Invalid `Const` during codegen: {:?}", ct),
}
.unwrap();
}

2
compiler/rustc_codegen_ssa/src/mir/constant.rs
View file

@ -43,7 +43,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
mir::Const::Ty(c) => match c.kind() {
// A constant that came from a const generic but was then used as an argument to old-style
// simd_shuffle (passing as argument instead of as a generic param).
rustc_type_ir::ConstKind::Value(valtree) => return Ok(Some(valtree)),
rustc_type_ir::ConstKind::Value(_, valtree) => return Ok(Some(valtree)),
other => span_bug!(constant.span, "{other:#?}"),
},
// We should never encounter `Const::Val` unless MIR opts (like const prop) evaluate