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change ConstInt impl to not rely on ScalarInt #96789

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change ConstInt impl to not rely on ScalarInt #96789

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6 changes: 5 additions & 1 deletion compiler/rustc_const_eval/src/interpret/operand.rs
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Expand Up @@ -245,7 +245,11 @@ impl<'tcx, Tag: Provenance> ImmTy<'tcx, Tag> {
pub fn to_const_int(self) -> ConstInt {
assert!(self.layout.ty.is_integral());
let int = self.to_scalar().expect("to_const_int doesn't work on scalar pairs").assert_int();
ConstInt::new(int, self.layout.ty.is_signed(), self.layout.ty.is_ptr_sized_integral())
ConstInt::new_with_width(
int.assert_bits(int.size()),
self.layout.ty,
int.size().bytes() as u32,
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Please don't use as casts in the interpreter.

)
}
}

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183 changes: 97 additions & 86 deletions compiler/rustc_middle/src/ty/consts/int.rs
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@@ -1,113 +1,124 @@
use crate::ty::{self, Ty, TyCtxt};
use rustc_apfloat::ieee::{Double, Single};
use rustc_apfloat::Float;
use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
use rustc_target::abi::Size;
use rustc_type_ir::{IntTy, UintTy};
use std::convert::{TryFrom, TryInto};
use std::fmt;

use crate::ty::TyCtxt;
#[derive(Copy, Clone)]
enum IntegerTy {
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I checked, but there seem to be no existing enums like this. Surprising...

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We might want to refactor Ty to have a single Int variant with a field of this type, rather than 2 top-level Int and Uint variants.

Uint(UintTy),
Int(IntTy),
}

#[derive(Copy, Clone)]
/// A type for representing any integer. Only used for printing.
pub struct ConstInt {
/// The "untyped" variant of `ConstInt`.
int: ScalarInt,
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I thought this was going to get more reuse, looks like it never did

/// Whether the value is of a signed integer type.
signed: bool,
/// Whether the value is a `usize` or `isize` type.
is_ptr_sized_integral: bool,
pointer_width: u32,
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What does this field do/mean? Please add a doc comment to each field.

/// The byte value of the integer.
value: u128,
ty: IntegerTy,
}

impl ConstInt {
pub fn new(int: ScalarInt, signed: bool, is_ptr_sized_integral: bool) -> Self {
Self { int, signed, is_ptr_sized_integral }
pub fn new(tcx: TyCtxt<'_>, value: u128, ty: Ty<'_>) -> Self {
Self::new_with_width(value, ty, tcx.sess.target.pointer_width)
}

pub fn new_with_width(value: u128, ty: Ty<'_>, pointer_width: u32) -> Self {
let ty = match *ty.kind() {
ty::Uint(uty) => IntegerTy::Uint(uty),
ty::Int(ity) => IntegerTy::Int(ity),
_ => bug!("unexpected type for ConstInt: {ty}"),
};

Self { pointer_width, value, ty }
}
}

impl std::fmt::Debug for ConstInt {
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let Self { int, signed, is_ptr_sized_integral } = *self;
let size = int.size().bytes();
let raw = int.data;
if signed {
let bit_size = size * 8;
let min = 1u128 << (bit_size - 1);
let max = min - 1;
if raw == min {
match (size, is_ptr_sized_integral) {
(_, true) => write!(fmt, "isize::MIN"),
(1, _) => write!(fmt, "i8::MIN"),
(2, _) => write!(fmt, "i16::MIN"),
(4, _) => write!(fmt, "i32::MIN"),
(8, _) => write!(fmt, "i64::MIN"),
(16, _) => write!(fmt, "i128::MIN"),
_ => bug!("ConstInt 0x{:x} with size = {} and signed = {}", raw, size, signed),
}
} else if raw == max {
match (size, is_ptr_sized_integral) {
(_, true) => write!(fmt, "isize::MAX"),
(1, _) => write!(fmt, "i8::MAX"),
(2, _) => write!(fmt, "i16::MAX"),
(4, _) => write!(fmt, "i32::MAX"),
(8, _) => write!(fmt, "i64::MAX"),
(16, _) => write!(fmt, "i128::MAX"),
_ => bug!("ConstInt 0x{:x} with size = {} and signed = {}", raw, size, signed),
}
} else {
match size {
1 => write!(fmt, "{}", raw as i8)?,
2 => write!(fmt, "{}", raw as i16)?,
4 => write!(fmt, "{}", raw as i32)?,
8 => write!(fmt, "{}", raw as i64)?,
16 => write!(fmt, "{}", raw as i128)?,
_ => bug!("ConstInt 0x{:x} with size = {} and signed = {}", raw, size, signed),
}
if fmt.alternate() {
match (size, is_ptr_sized_integral) {
(_, true) => write!(fmt, "_isize")?,
(1, _) => write!(fmt, "_i8")?,
(2, _) => write!(fmt, "_i16")?,
(4, _) => write!(fmt, "_i32")?,
(8, _) => write!(fmt, "_i64")?,
(16, _) => write!(fmt, "_i128")?,
_ => bug!(),
let ConstInt { pointer_width, value, ty } = *self;
match ty {
IntegerTy::Int(ity) => {
let size = ity.bit_width().unwrap_or(pointer_width as u64);
let min = 1u128 << (size * 8 - 1);
let max = min - 1;
if value == min {
match ity {
IntTy::Isize => write!(fmt, "isize::MIN"),
IntTy::I8 => write!(fmt, "i8::MIN"),
IntTy::I16 => write!(fmt, "i16::MIN"),
IntTy::I32 => write!(fmt, "i32::MIN"),
IntTy::I64 => write!(fmt, "i64::MIN"),
IntTy::I128 => write!(fmt, "i128::MIN"),
}
} else if value == max {
match ity {
IntTy::Isize => write!(fmt, "isize::MAX"),
IntTy::I8 => write!(fmt, "i8::MAX"),
IntTy::I16 => write!(fmt, "i16::MAX"),
IntTy::I32 => write!(fmt, "i32::MAX"),
IntTy::I64 => write!(fmt, "i64::MAX"),
IntTy::I128 => write!(fmt, "i128::MAX"),
}
} else {
match size {
1 => write!(fmt, "{}", value as i8)?,
2 => write!(fmt, "{}", value as i16)?,
4 => write!(fmt, "{}", value as i32)?,
8 => write!(fmt, "{}", value as i64)?,
16 => write!(fmt, "{}", value as i128)?,
_ => bug!("signed ConstInt 0x{value:x} of size {size}"),
}
if fmt.alternate() {
match ity {
IntTy::Isize => write!(fmt, "_isize")?,
IntTy::I8 => write!(fmt, "_i8")?,
IntTy::I16 => write!(fmt, "_i16")?,
IntTy::I32 => write!(fmt, "_i32")?,
IntTy::I64 => write!(fmt, "_i64")?,
IntTy::I128 => write!(fmt, "_i128")?,
}
}
Ok(())
}
Ok(())
}
} else {
let max = Size::from_bytes(size).truncate(u128::MAX);
if raw == max {
match (size, is_ptr_sized_integral) {
(_, true) => write!(fmt, "usize::MAX"),
(1, _) => write!(fmt, "u8::MAX"),
(2, _) => write!(fmt, "u16::MAX"),
(4, _) => write!(fmt, "u32::MAX"),
(8, _) => write!(fmt, "u64::MAX"),
(16, _) => write!(fmt, "u128::MAX"),
_ => bug!("ConstInt 0x{:x} with size = {} and signed = {}", raw, size, signed),
}
} else {
match size {
1 => write!(fmt, "{}", raw as u8)?,
2 => write!(fmt, "{}", raw as u16)?,
4 => write!(fmt, "{}", raw as u32)?,
8 => write!(fmt, "{}", raw as u64)?,
16 => write!(fmt, "{}", raw as u128)?,
_ => bug!("ConstInt 0x{:x} with size = {} and signed = {}", raw, size, signed),
}
if fmt.alternate() {
match (size, is_ptr_sized_integral) {
(_, true) => write!(fmt, "_usize")?,
(1, _) => write!(fmt, "_u8")?,
(2, _) => write!(fmt, "_u16")?,
(4, _) => write!(fmt, "_u32")?,
(8, _) => write!(fmt, "_u64")?,
(16, _) => write!(fmt, "_u128")?,
_ => bug!(),
IntegerTy::Uint(uty) => {
let size = uty.bit_width().unwrap_or(pointer_width.into());
let max = Size::from_bytes(size).truncate(u128::MAX);
if value == max {
match uty {
UintTy::Usize => write!(fmt, "usize::MAX"),
UintTy::U8 => write!(fmt, "u8::MAX"),
UintTy::U16 => write!(fmt, "u16::MAX"),
UintTy::U32 => write!(fmt, "u32::MAX"),
UintTy::U64 => write!(fmt, "u64::MAX"),
UintTy::U128 => write!(fmt, "u128::MAX"),
}
} else {
match size {
1 => write!(fmt, "{}", value as u8)?,
2 => write!(fmt, "{}", value as u16)?,
4 => write!(fmt, "{}", value as u32)?,
8 => write!(fmt, "{}", value as u64)?,
16 => write!(fmt, "{}", value as u128)?,
_ => bug!("unsigned ConstInt 0x{value:x} of size {size}"),
}
if fmt.alternate() {
match uty {
UintTy::Usize => write!(fmt, "_usize")?,
UintTy::U8 => write!(fmt, "_u8")?,
UintTy::U16 => write!(fmt, "_u16")?,
UintTy::U32 => write!(fmt, "_u32")?,
UintTy::U64 => write!(fmt, "_u64")?,
UintTy::U128 => write!(fmt, "_u128")?,
}
}
Ok(())
}
Ok(())
}
}
}
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3 changes: 1 addition & 2 deletions compiler/rustc_middle/src/ty/print/pretty.rs
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Expand Up @@ -1329,8 +1329,7 @@ pub trait PrettyPrinter<'tcx>:
}
// Int
ty::Uint(_) | ty::Int(_) => {
let int =
ConstInt::new(int, matches!(ty.kind(), ty::Int(_)), ty.is_ptr_sized_integral());
let int = ConstInt::new(self.tcx(), int.assert_bits(int.size()), ty);
if print_ty { p!(write("{:#?}", int)) } else { p!(write("{:?}", int)) }
}
// Char
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10 changes: 5 additions & 5 deletions compiler/rustc_mir_transform/src/const_prop_lint.rs
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Expand Up @@ -18,7 +18,7 @@ use rustc_middle::mir::{
use rustc_middle::ty::layout::{LayoutError, LayoutOf, LayoutOfHelpers, TyAndLayout};
use rustc_middle::ty::subst::{InternalSubsts, Subst};
use rustc_middle::ty::{
self, ConstInt, ConstKind, Instance, ParamEnv, ScalarInt, Ty, TyCtxt, TypeFoldable,
self, ConstInt, ConstKind, Instance, ParamEnv, Ty, TyCtxt, TypeFoldable,
};
use rustc_session::lint;
use rustc_span::{def_id::DefId, Span};
Expand Down Expand Up @@ -579,10 +579,10 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
match l {
Some(l) => l.to_const_int(),
// Invent a dummy value, the diagnostic ignores it anyway
None => ConstInt::new(
ScalarInt::try_from_uint(1_u8, left_size).unwrap(),
left_ty.is_signed(),
left_ty.is_ptr_sized_integral(),
None => ConstInt::new_with_width(
1,
left_ty,
left_size.bytes() as u32,
),
},
r.to_const_int(),
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3 changes: 1 addition & 2 deletions compiler/rustc_symbol_mangling/src/legacy.rs
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Expand Up @@ -267,11 +267,10 @@ impl<'tcx> Printer<'tcx> for &mut SymbolPrinter<'tcx> {
) => {
// The `pretty_print_const` formatting depends on -Zverbose
// flag, so we cannot reuse it here.
let signed = matches!(ct.ty().kind(), ty::Int(_));
write!(
self,
"{:#?}",
ty::ConstInt::new(scalar, signed, ct.ty().is_ptr_sized_integral())
ty::ConstInt::new(self.tcx, scalar.assert_bits(scalar.size()), ct.ty())
)?;
}
_ => self.write_str("_")?,
Expand Down