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use rustc_apfloat::ieee::{Double, Single};
use rustc_apfloat::Float;
use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
use rustc_target::abi::Size;
use std::convert::{TryFrom, TryInto};
use std::fmt;
use std::num::NonZeroU8;
use crate::ty::TyCtxt;
#[derive(Copy, Clone)]
pub struct ConstInt {
int: ScalarInt,
signed: bool,
is_ptr_sized_integral: bool,
}
impl ConstInt {
pub fn new(int: ScalarInt, signed: bool, is_ptr_sized_integral: bool) -> Self {
Self { int, signed, is_ptr_sized_integral }
}
}
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!(),
}
}
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!(),
}
}
Ok(())
}
}
}
}
#[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[repr(packed)]
pub struct ScalarInt {
data: u128,
size: NonZeroU8,
}
impl<CTX> crate::ty::HashStable<CTX> for ScalarInt {
fn hash_stable(&self, hcx: &mut CTX, hasher: &mut crate::ty::StableHasher) {
{ self.data }.hash_stable(hcx, hasher);
self.size.get().hash_stable(hcx, hasher);
}
}
impl<S: Encoder> Encodable<S> for ScalarInt {
fn encode(&self, s: &mut S) {
s.emit_u128(self.data);
s.emit_u8(self.size.get());
}
}
impl<D: Decoder> Decodable<D> for ScalarInt {
fn decode(d: &mut D) -> ScalarInt {
ScalarInt { data: d.read_u128(), size: NonZeroU8::new(d.read_u8()).unwrap() }
}
}
impl ScalarInt {
pub const TRUE: ScalarInt = ScalarInt { data: 1_u128, size: NonZeroU8::new(1).unwrap() };
pub const FALSE: ScalarInt = ScalarInt { data: 0_u128, size: NonZeroU8::new(1).unwrap() };
#[inline]
pub fn size(self) -> Size {
Size::from_bytes(self.size.get())
}
#[inline(always)]
fn check_data(self) {
debug_assert_eq!(
self.size().truncate(self.data),
{ self.data },
"Scalar value {:#x} exceeds size of {} bytes",
{ self.data },
self.size
);
}
#[inline]
pub fn null(size: Size) -> Self {
Self { data: 0, size: NonZeroU8::new(size.bytes() as u8).unwrap() }
}
#[inline]
pub fn is_null(self) -> bool {
self.data == 0
}
#[inline]
pub fn try_from_uint(i: impl Into<u128>, size: Size) -> Option<Self> {
let data = i.into();
if size.truncate(data) == data {
Some(Self { data, size: NonZeroU8::new(size.bytes() as u8).unwrap() })
} else {
None
}
}
#[inline]
pub fn try_from_int(i: impl Into<i128>, size: Size) -> Option<Self> {
let i = i.into();
let truncated = size.truncate(i as u128);
if size.sign_extend(truncated) as i128 == i {
Some(Self { data: truncated, size: NonZeroU8::new(size.bytes() as u8).unwrap() })
} else {
None
}
}
#[inline]
pub fn assert_bits(self, target_size: Size) -> u128 {
self.to_bits(target_size).unwrap_or_else(|size| {
bug!("expected int of size {}, but got size {}", target_size.bytes(), size.bytes())
})
}
#[inline]
pub fn to_bits(self, target_size: Size) -> Result<u128, Size> {
assert_ne!(target_size.bytes(), 0, "you should never look at the bits of a ZST");
if target_size.bytes() == u64::from(self.size.get()) {
self.check_data();
Ok(self.data)
} else {
Err(self.size())
}
}
#[inline]
pub fn try_to_machine_usize<'tcx>(&self, tcx: TyCtxt<'tcx>) -> Result<u64, Size> {
Ok(self.to_bits(tcx.data_layout.pointer_size)? as u64)
}
#[inline]
pub fn try_to_uint(self, size: Size) -> Result<u128, Size> {
self.to_bits(size)
}
#[inline]
pub fn try_to_u8(self) -> Result<u8, Size> {
self.to_bits(Size::from_bits(8)).map(|v| u8::try_from(v).unwrap())
}
#[inline]
pub fn try_to_u16(self) -> Result<u16, Size> {
self.to_bits(Size::from_bits(16)).map(|v| u16::try_from(v).unwrap())
}
#[inline]
pub fn try_to_u32(self) -> Result<u32, Size> {
self.to_bits(Size::from_bits(32)).map(|v| u32::try_from(v).unwrap())
}
#[inline]
pub fn try_to_u64(self) -> Result<u64, Size> {
self.to_bits(Size::from_bits(64)).map(|v| u64::try_from(v).unwrap())
}
#[inline]
pub fn try_to_u128(self) -> Result<u128, Size> {
self.to_bits(Size::from_bits(128))
}
#[inline]
pub fn try_to_int(self, size: Size) -> Result<i128, Size> {
let b = self.to_bits(size)?;
Ok(size.sign_extend(b) as i128)
}
pub fn try_to_i8(self) -> Result<i8, Size> {
self.try_to_int(Size::from_bits(8)).map(|v| i8::try_from(v).unwrap())
}
pub fn try_to_i16(self) -> Result<i16, Size> {
self.try_to_int(Size::from_bits(16)).map(|v| i16::try_from(v).unwrap())
}
pub fn try_to_i32(self) -> Result<i32, Size> {
self.try_to_int(Size::from_bits(32)).map(|v| i32::try_from(v).unwrap())
}
pub fn try_to_i64(self) -> Result<i64, Size> {
self.try_to_int(Size::from_bits(64)).map(|v| i64::try_from(v).unwrap())
}
pub fn try_to_i128(self) -> Result<i128, Size> {
self.try_to_int(Size::from_bits(128)).map(|v| i128::try_from(v).unwrap())
}
}
macro_rules! from {
($($ty:ty),*) => {
$(
impl From<$ty> for ScalarInt {
#[inline]
fn from(u: $ty) -> Self {
Self {
data: u128::from(u),
size: NonZeroU8::new(std::mem::size_of::<$ty>() as u8).unwrap(),
}
}
}
)*
}
}
macro_rules! try_from {
($($ty:ty),*) => {
$(
impl TryFrom<ScalarInt> for $ty {
type Error = Size;
#[inline]
fn try_from(int: ScalarInt) -> Result<Self, Size> {
int.to_bits(Size::from_bytes(std::mem::size_of::<$ty>()))
.map(|u| u.try_into().unwrap())
}
}
)*
}
}
from!(u8, u16, u32, u64, u128, bool);
try_from!(u8, u16, u32, u64, u128);
impl TryFrom<ScalarInt> for bool {
type Error = Size;
#[inline]
fn try_from(int: ScalarInt) -> Result<Self, Size> {
int.to_bits(Size::from_bytes(1)).and_then(|u| match u {
0 => Ok(false),
1 => Ok(true),
_ => Err(Size::from_bytes(1)),
})
}
}
impl From<char> for ScalarInt {
#[inline]
fn from(c: char) -> Self {
Self { data: c as u128, size: NonZeroU8::new(std::mem::size_of::<char>() as u8).unwrap() }
}
}
#[derive(Debug)]
pub struct CharTryFromScalarInt;
impl TryFrom<ScalarInt> for char {
type Error = CharTryFromScalarInt;
#[inline]
fn try_from(int: ScalarInt) -> Result<Self, Self::Error> {
let Ok(bits) = int.to_bits(Size::from_bytes(std::mem::size_of::<char>())) else {
return Err(CharTryFromScalarInt);
};
match char::from_u32(bits.try_into().unwrap()) {
Some(c) => Ok(c),
None => Err(CharTryFromScalarInt),
}
}
}
impl From<Single> for ScalarInt {
#[inline]
fn from(f: Single) -> Self {
Self { data: f.to_bits(), size: NonZeroU8::new((Single::BITS / 8) as u8).unwrap() }
}
}
impl TryFrom<ScalarInt> for Single {
type Error = Size;
#[inline]
fn try_from(int: ScalarInt) -> Result<Self, Size> {
int.to_bits(Size::from_bytes(4)).map(Self::from_bits)
}
}
impl From<Double> for ScalarInt {
#[inline]
fn from(f: Double) -> Self {
Self { data: f.to_bits(), size: NonZeroU8::new((Double::BITS / 8) as u8).unwrap() }
}
}
impl TryFrom<ScalarInt> for Double {
type Error = Size;
#[inline]
fn try_from(int: ScalarInt) -> Result<Self, Size> {
int.to_bits(Size::from_bytes(8)).map(Self::from_bits)
}
}
impl fmt::Debug for ScalarInt {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "0x{:x}", self)
}
}
impl fmt::LowerHex for ScalarInt {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.check_data();
if f.alternate() {
write!(f, "0x")?;
}
write!(f, "{:01$x}", { self.data }, self.size.get() as usize * 2)
}
}
impl fmt::UpperHex for ScalarInt {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.check_data();
write!(f, "{:01$X}", { self.data }, self.size.get() as usize * 2)
}
}
impl fmt::Display for ScalarInt {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.check_data();
write!(f, "{}", { self.data })
}
}