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Merged
coord-e merged 1 commit into from
Dec 14, 2025
Merged

Enable to handle some promoted constants #12

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102 changes: 101 additions & 1 deletion src/analyze/basic_block.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -125,11 +125,111 @@ impl<'tcx, 'ctx> Analyzer<'tcx, 'ctx> {
clauses
}

fn const_bytes_ty(
&self,
ty: mir_ty::Ty<'tcx>,
alloc: mir::interpret::ConstAllocation,
range: std::ops::Range<usize>,
) -> PlaceType {
let alloc = alloc.inner();
let bytes = alloc.inspect_with_uninit_and_ptr_outside_interpreter(range);
match ty.kind() {
mir_ty::TyKind::Str => {
let content = std::str::from_utf8(bytes).unwrap();
PlaceType::with_ty_and_term(
rty::Type::string(),
chc::Term::string(content.to_owned()),
)
}
mir_ty::TyKind::Bool => {
PlaceType::with_ty_and_term(rty::Type::bool(), chc::Term::bool(bytes[0] != 0))
}
mir_ty::TyKind::Int(_) => {
// TODO: see target endianness
let val = match bytes.len() {
1 => i8::from_ne_bytes(bytes.try_into().unwrap()) as i64,
2 => i16::from_ne_bytes(bytes.try_into().unwrap()) as i64,
4 => i32::from_ne_bytes(bytes.try_into().unwrap()) as i64,
8 => i64::from_ne_bytes(bytes.try_into().unwrap()),
_ => unimplemented!("const int bytes len: {}", bytes.len()),
};
PlaceType::with_ty_and_term(rty::Type::int(), chc::Term::int(val))
}
_ => unimplemented!("const bytes ty: {:?}", ty),
}
}

fn const_value_ty(&self, val: &mir::ConstValue<'tcx>, ty: &mir_ty::Ty<'tcx>) -> PlaceType {
use mir::{interpret::Scalar, ConstValue, Mutability};
match (ty.kind(), val) {
(mir_ty::TyKind::Int(_), ConstValue::Scalar(Scalar::Int(val))) => {
let val = val.try_to_int(val.size()).unwrap();
PlaceType::with_ty_and_term(
rty::Type::int(),
chc::Term::int(val.try_into().unwrap()),
)
}
(mir_ty::TyKind::Bool, ConstValue::Scalar(Scalar::Int(val))) => {
PlaceType::with_ty_and_term(
rty::Type::bool(),
chc::Term::bool(val.try_to_bool().unwrap()),
)
}
(
mir_ty::TyKind::Ref(_, elem, Mutability::Not),
ConstValue::Scalar(Scalar::Ptr(ptr, _)),
) => {
// Pointer::into_parts is OK for CtfeProvenance
// in a later version of rustc it has prov_and_relative_offset that ensures this
let (prov, offset) = ptr.into_parts();
let global_alloc = self.tcx.global_alloc(prov.alloc_id());
match global_alloc {
mir::interpret::GlobalAlloc::Memory(alloc) => {
let layout = self
.tcx
.layout_of(mir_ty::ParamEnv::reveal_all().and(*elem))
.unwrap();
let size = layout.size;
let range =
offset.bytes() as usize..(offset.bytes() + size.bytes()) as usize;
self.const_bytes_ty(*elem, alloc, range).immut()
}
_ => unimplemented!("const ptr alloc: {:?}", global_alloc),
}
}
(mir_ty::TyKind::Ref(_, elem, Mutability::Not), ConstValue::Slice { data, meta }) => {
let end = (*meta).try_into().unwrap();
self.const_bytes_ty(*elem, *data, 0..end).immut()
}
_ => unimplemented!("const: {:?}, ty: {:?}", val, ty),
}
}

fn const_ty(&self, const_: &mir::Const<'tcx>) -> PlaceType {
match const_ {
mir::Const::Val(val, ty) => self.const_value_ty(val, ty),
mir::Const::Unevaluated(unevaluated, ty) => {
// since all constants are immutable in current setup,
// it should be okay to evaluate them here on-the-fly
let param_env = self.tcx.param_env(self.local_def_id);
let val = self
.tcx
.const_eval_resolve(param_env, *unevaluated, None)
.unwrap();
self.const_value_ty(&val, ty)
}
_ => unimplemented!("const: {:?}", const_),
}
}

fn operand_type(&self, mut operand: Operand<'tcx>) -> PlaceType {
if let Operand::Copy(p) | Operand::Move(p) = &mut operand {
*p = self.elaborate_place(p);
}
let ty = self.env.operand_type(operand.clone());
let ty = match &operand {
Operand::Copy(place) | Operand::Move(place) => self.env.place_type(*place),
Operand::Constant(operand) => self.const_ty(&operand.const_),
};
tracing::debug!(operand = ?operand, ty = %ty.display(), "operand_type");
ty
}
Expand Down
53 changes: 9 additions & 44 deletions src/refine/env.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,7 @@ use std::collections::{BTreeMap, HashMap};

use pretty::{termcolor, Pretty};
use rustc_index::IndexVec;
use rustc_middle::mir::{self, Local, Operand, Place, PlaceElem};
use rustc_middle::ty as mir_ty;
use rustc_middle::mir::{Local, Place, PlaceElem};
use rustc_target::abi::{FieldIdx, VariantIdx};

use crate::chc;
Expand Down Expand Up @@ -454,6 +453,14 @@ impl PlaceType {
builder.build(ty, term)
}

pub fn immut(self) -> PlaceType {
let mut builder = PlaceTypeBuilder::default();
let (inner_ty, inner_term) = builder.subsume(self);
let ty = rty::PointerType::immut_to(inner_ty).into();
let term = chc::Term::box_(inner_term);
builder.build(ty, term)
}

pub fn tuple(ptys: Vec<PlaceType>) -> PlaceType {
let mut builder = PlaceTypeBuilder::default();
let mut tys = Vec::new();
Expand Down Expand Up @@ -951,48 +958,6 @@ impl Env {
self.var_type(local.into())
}

pub fn operand_type(&self, operand: Operand<'_>) -> PlaceType {
use mir::{interpret::Scalar, Const, ConstValue, Mutability};
match operand {
Operand::Copy(place) | Operand::Move(place) => self.place_type(place),
Operand::Constant(operand) => {
let Const::Val(val, ty) = operand.const_ else {
unimplemented!("const: {:?}", operand.const_);
};
match (ty.kind(), val) {
(mir_ty::TyKind::Int(_), ConstValue::Scalar(Scalar::Int(val))) => {
let val = val.try_to_int(val.size()).unwrap();
PlaceType::with_ty_and_term(
rty::Type::int(),
chc::Term::int(val.try_into().unwrap()),
)
}
(mir_ty::TyKind::Bool, ConstValue::Scalar(Scalar::Int(val))) => {
PlaceType::with_ty_and_term(
rty::Type::bool(),
chc::Term::bool(val.try_to_bool().unwrap()),
)
}
(
mir_ty::TyKind::Ref(_, elem, Mutability::Not),
ConstValue::Slice { data, meta },
) if matches!(elem.kind(), mir_ty::TyKind::Str) => {
let end = meta.try_into().unwrap();
let content = data
.inner()
.inspect_with_uninit_and_ptr_outside_interpreter(0..end);
let content = std::str::from_utf8(content).unwrap();
PlaceType::with_ty_and_term(
rty::PointerType::immut_to(rty::Type::string()).into(),
chc::Term::box_(chc::Term::string(content.to_owned())),
)
}
_ => unimplemented!("const: {:?}, ty: {:?}", val, ty),
}
}
}
}

fn borrow_var(&mut self, var: Var, prophecy: TempVarIdx) -> PlaceType {
match *self.flow_binding(var).expect("borrowing unbound var") {
FlowBinding::Box(x) => {
Expand Down