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Remove location threading

This commit is contained in:
Oli Scherer 2024-01-05 17:12:44 +00:00
parent e904a640ac
commit 0294a0de09
1 changed files with 40 additions and 49 deletions
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89
compiler/rustc_mir_transform/src/const_prop_lint.rs
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@ -3,8 +3,6 @@
use std::fmt::Debug;
use either::Left;
use rustc_const_eval::interpret::{ImmTy, MPlaceTy, Projectable};
use rustc_const_eval::interpret::{InterpCx, InterpResult, OpTy, Scalar, StackPopCleanup};
use rustc_hir::def::DefKind;
@ -248,12 +246,10 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
source_info.scope.lint_root(&self.body().source_scopes)
}
fn use_ecx<F, T>(&mut self, location: Location, f: F) -> Option<T>
fn use_ecx<F, T>(&mut self, f: F) -> Option<T>
where
F: FnOnce(&mut Self) -> InterpResult<'tcx, T>,
{
// Overwrite the PC -- whatever the interpreter does to it does not make any sense anyway.
self.ecx.frame_mut().loc = Left(location);
match f(self) {
Ok(val) => Some(val),
Err(error) => {
@ -275,7 +271,6 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
fn eval_constant(
&mut self,
c: &ConstOperand<'tcx>,
location: Location,
layout: Option<TyAndLayout<'tcx>>,
) -> Option<OpTy<'tcx>> {
// FIXME we need to revisit this for #67176
@ -291,7 +286,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
// manually normalized.
let val = self.tcx.try_normalize_erasing_regions(self.param_env, c.const_).ok()?;
self.use_ecx(location, |this| this.ecx.eval_mir_constant(&val, Some(c.span), layout))
self.use_ecx(|this| this.ecx.eval_mir_constant(&val, Some(c.span), layout))
}
/// Returns the value, if any, of evaluating `place`.
@ -313,11 +308,10 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
fn eval_operand(
&mut self,
op: &Operand<'tcx>,
location: Location,
layout: Option<TyAndLayout<'tcx>>,
) -> Option<OpTy<'tcx>> {
match *op {
Operand::Constant(ref c) => self.eval_constant(c, location, layout),
Operand::Constant(ref c) => self.eval_constant(c, layout),
Operand::Move(place) | Operand::Copy(place) => self.eval_place(place, layout),
}
}
@ -329,8 +323,8 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
}
fn check_unary_op(&mut self, op: UnOp, arg: &Operand<'tcx>, location: Location) -> Option<()> {
let arg = self.eval_operand(arg, location, None)?;
if let (val, true) = self.use_ecx(location, |this| {
let arg = self.eval_operand(arg, None)?;
if let (val, true) = self.use_ecx(|this| {
let val = this.ecx.read_immediate(&arg)?;
let (_res, overflow) = this.ecx.overflowing_unary_op(op, &val)?;
Ok((val, overflow))
@ -360,11 +354,11 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
location: Location,
) -> Option<()> {
let r = self
.eval_operand(right, location, None)
.and_then(|r| self.use_ecx(location, |this| this.ecx.read_immediate(&r)));
.eval_operand(right, None)
.and_then(|r| self.use_ecx(|this| this.ecx.read_immediate(&r)));
let l = self
.eval_operand(left, location, None)
.and_then(|l| self.use_ecx(location, |this| this.ecx.read_immediate(&l)));
.eval_operand(left, None)
.and_then(|l| self.use_ecx(|this| this.ecx.read_immediate(&l)));
// Check for exceeding shifts *even if* we cannot evaluate the LHS.
if matches!(op, BinOp::Shr | BinOp::Shl) {
let r = r.clone()?;
@ -400,7 +394,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
if let (Some(l), Some(r)) = (l, r) {
// The remaining operators are handled through `overflowing_binary_op`.
if self.use_ecx(location, |this| {
if self.use_ecx(|this| {
let (_res, overflow) = this.ecx.overflowing_binary_op(op, &l, &r)?;
Ok(overflow)
})? {
@ -501,11 +495,11 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
cond: &Operand<'tcx>,
location: Location,
) -> Option<!> {
let value = &self.eval_operand(cond, location, None)?;
let value = &self.eval_operand(cond, None)?;
trace!("assertion on {:?} should be {:?}", value, expected);
let expected = Scalar::from_bool(expected);
let value_const = self.use_ecx(location, |this| this.ecx.read_scalar(value))?;
let value_const = self.use_ecx(|this| this.ecx.read_scalar(value))?;
if expected != value_const {
// Poison all places this operand references so that further code
@ -529,7 +523,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
let mut eval_to_int = |op| {
// This can be `None` if the lhs wasn't const propagated and we just
// triggered the assert on the value of the rhs.
self.eval_operand(op, location, None)
self.eval_operand(op, None)
.and_then(|op| self.ecx.read_immediate(&op).ok())
.map_or(DbgVal::Underscore, |op| DbgVal::Val(op.to_const_int()))
};
@ -585,44 +579,43 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
return None;
}
use rustc_middle::mir::Rvalue::*;
let layout = self.use_ecx(location, |this| this.ecx.eval_place(*dest))?.layout;
let layout = self.use_ecx(|this| this.ecx.eval_place(*dest))?.layout;
trace!(?layout);
let val: Value<'_> = match *rvalue {
ThreadLocalRef(_) => return None,
Use(ref operand) => self.eval_operand(operand, location, Some(layout))?.into(),
Use(ref operand) => self.eval_operand(operand, Some(layout))?.into(),
CopyForDeref(place) => self.eval_place(place, Some(layout))?.into(),
BinaryOp(bin_op, box (ref left, ref right)) => {
let layout =
rustc_const_eval::util::binop_left_homogeneous(bin_op).then_some(layout);
let left = self.eval_operand(left, location, layout)?;
let left = self.use_ecx(location, |this| this.ecx.read_immediate(&left))?;
let left = self.eval_operand(left, layout)?;
let left = self.use_ecx(|this| this.ecx.read_immediate(&left))?;
let layout =
rustc_const_eval::util::binop_right_homogeneous(bin_op).then_some(left.layout);
let right = self.eval_operand(right, location, layout)?;
let right = self.use_ecx(location, |this| this.ecx.read_immediate(&right))?;
let right = self.eval_operand(right, layout)?;
let right = self.use_ecx(|this| this.ecx.read_immediate(&right))?;
let val = self
.use_ecx(location, |this| this.ecx.wrapping_binary_op(bin_op, &left, &right))?;
let val =
self.use_ecx(|this| this.ecx.wrapping_binary_op(bin_op, &left, &right))?;
val.into()
}
CheckedBinaryOp(bin_op, box (ref left, ref right)) => {
let left = self.eval_operand(left, location, None)?;
let left = self.use_ecx(location, |this| this.ecx.read_immediate(&left))?;
let left = self.eval_operand(left, None)?;
let left = self.use_ecx(|this| this.ecx.read_immediate(&left))?;
let layout =
rustc_const_eval::util::binop_right_homogeneous(bin_op).then_some(left.layout);
let right = self.eval_operand(right, location, layout)?;
let right = self.use_ecx(location, |this| this.ecx.read_immediate(&right))?;
let right = self.eval_operand(right, layout)?;
let right = self.use_ecx(|this| this.ecx.read_immediate(&right))?;
let (val, overflowed) = self.use_ecx(location, |this| {
this.ecx.overflowing_binary_op(bin_op, &left, &right)
})?;
let (val, overflowed) =
self.use_ecx(|this| this.ecx.overflowing_binary_op(bin_op, &left, &right))?;
let overflowed = ImmTy::from_bool(overflowed, self.tcx);
Value::Aggregate {
variant: VariantIdx::new(0),
@ -631,10 +624,10 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
}
UnaryOp(un_op, ref operand) => {
let operand = self.eval_operand(operand, location, Some(layout))?;
let val = self.use_ecx(location, |this| this.ecx.read_immediate(&operand))?;
let operand = self.eval_operand(operand, Some(layout))?;
let val = self.use_ecx(|this| this.ecx.read_immediate(&operand))?;
let val = self.use_ecx(location, |this| this.ecx.wrapping_unary_op(un_op, &val))?;
let val = self.use_ecx(|this| this.ecx.wrapping_unary_op(un_op, &val))?;
val.into()
}
@ -642,8 +635,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
fields: fields
.iter()
.map(|field| {
self.eval_operand(field, location, None)
.map_or(Value::Uninit, Value::Immediate)
self.eval_operand(field, None).map_or(Value::Uninit, Value::Immediate)
})
.collect(),
variant: match **kind {
@ -675,7 +667,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
Ref(..) | AddressOf(..) => return None,
NullaryOp(ref null_op, ty) => {
let op_layout = self.use_ecx(location, |this| this.ecx.layout_of(ty))?;
let op_layout = self.use_ecx(|this| this.ecx.layout_of(ty))?;
let val = match null_op {
NullOp::SizeOf => op_layout.size.bytes(),
NullOp::AlignOf => op_layout.align.abi.bytes(),
@ -690,21 +682,21 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
Cast(ref kind, ref value, to) => match kind {
CastKind::IntToInt | CastKind::IntToFloat => {
let value = self.eval_operand(value, location, None)?;
let value = self.eval_operand(value, None)?;
let value = self.ecx.read_immediate(&value).ok()?;
let to = self.ecx.layout_of(to).ok()?;
let res = self.ecx.int_to_int_or_float(&value, to).ok()?;
res.into()
}
CastKind::FloatToFloat | CastKind::FloatToInt => {
let value = self.eval_operand(value, location, None)?;
let value = self.eval_operand(value, None)?;
let value = self.ecx.read_immediate(&value).ok()?;
let to = self.ecx.layout_of(to).ok()?;
let res = self.ecx.float_to_float_or_int(&value, to).ok()?;
res.into()
}
CastKind::Transmute => {
let value = self.eval_operand(value, location, None)?;
let value = self.eval_operand(value, None)?;
let to = self.ecx.layout_of(to).ok()?;
// `offset` for immediates only supports scalar/scalar-pair ABIs,
// so bail out if the target is not one.
@ -724,12 +716,12 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
let variant = match self.get_const(place)? {
Value::Immediate(op) => {
let op = op.clone();
self.use_ecx(location, |this| this.ecx.read_discriminant(&op))?
self.use_ecx(|this| this.ecx.read_discriminant(&op))?
}
Value::Aggregate { variant, .. } => *variant,
Value::Uninit => return None,
};
let imm = self.use_ecx(location, |this| {
let imm = self.use_ecx(|this| {
this.ecx.discriminant_for_variant(
place.ty(this.local_decls(), this.tcx).ty,
variant,
@ -791,7 +783,7 @@ impl<'tcx> Visitor<'tcx> for ConstPropagator<'_, 'tcx> {
fn visit_constant(&mut self, constant: &ConstOperand<'tcx>, location: Location) {
trace!("visit_constant: {:?}", constant);
self.super_constant(constant, location);
self.eval_constant(constant, location, None);
self.eval_constant(constant, None);
}
fn visit_assign(&mut self, place: &Place<'tcx>, rvalue: &Rvalue<'tcx>, location: Location) {
@ -864,9 +856,8 @@ impl<'tcx> Visitor<'tcx> for ConstPropagator<'_, 'tcx> {
self.check_assertion(*expected, msg, cond, location);
}
TerminatorKind::SwitchInt { ref discr, ref targets } => {
if let Some(ref value) = self.eval_operand(discr, location, None)
&& let Some(value_const) =
self.use_ecx(location, |this| this.ecx.read_scalar(value))
if let Some(ref value) = self.eval_operand(discr, None)
&& let Some(value_const) = self.use_ecx(|this| this.ecx.read_scalar(value))
&& let Ok(constant) = value_const.try_to_int()
&& let Ok(constant) = constant.to_bits(constant.size())
{