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remove some unsafety from uint.rs

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This commit is contained in:
Robert Habermeier 2016-06-07 16:42:07 +02:00
parent db869fcdd1
commit 5168a1c851
1 changed files with 13 additions and 12 deletions
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25
util/bigint/src/uint.rs
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@ -92,8 +92,8 @@ macro_rules! uint_overflowing_add_reg {
macro_rules! uint_overflowing_add { macro_rules! uint_overflowing_add {
(U256, $n_words: expr, $self_expr: expr, $other: expr) => ({ (U256, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 4] = unsafe { mem::uninitialized() }; let mut result: [u64; 4] = unsafe { mem::uninitialized() };
let self_t: &[u64; 4] = unsafe { &mem::transmute($self_expr) }; let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = unsafe { &mem::transmute($other) }; let other_t: &[u64; 4] = &other.0;
let overflow: u8; let overflow: u8;
unsafe { unsafe {
@ -115,8 +115,8 @@ macro_rules! uint_overflowing_add {
}); });
(U512, $n_words: expr, $self_expr: expr, $other: expr) => ({ (U512, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 8] = unsafe { mem::uninitialized() }; let mut result: [u64; 8] = unsafe { mem::uninitialized() };
let self_t: &[u64; 8] = unsafe { &mem::transmute($self_expr) }; let self_t: &[u64; 8] = &self.0;
let other_t: &[u64; 8] = unsafe { &mem::transmute($other) }; let other_t: &[u64; 8] = &other.0;
let overflow: u8; let overflow: u8;
@ -196,8 +196,8 @@ macro_rules! uint_overflowing_sub_reg {
macro_rules! uint_overflowing_sub { macro_rules! uint_overflowing_sub {
(U256, $n_words: expr, $self_expr: expr, $other: expr) => ({ (U256, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 4] = unsafe { mem::uninitialized() }; let mut result: [u64; 4] = unsafe { mem::uninitialized() };
let self_t: &[u64; 4] = unsafe { &mem::transmute($self_expr) }; let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = unsafe { &mem::transmute($other) }; let other_t: &[u64; 4] = &other.0;
let overflow: u8; let overflow: u8;
unsafe { unsafe {
@ -218,8 +218,8 @@ macro_rules! uint_overflowing_sub {
}); });
(U512, $n_words: expr, $self_expr: expr, $other: expr) => ({ (U512, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 8] = unsafe { mem::uninitialized() }; let mut result: [u64; 8] = unsafe { mem::uninitialized() };
let self_t: &[u64; 8] = unsafe { &mem::transmute($self_expr) }; let self_t: &[u64; 8] = &self.0;
let other_t: &[u64; 8] = unsafe { &mem::transmute($other) }; let other_t: &[u64; 8] = &other.0;
let overflow: u8; let overflow: u8;
@ -270,8 +270,8 @@ macro_rules! uint_overflowing_sub {
macro_rules! uint_overflowing_mul { macro_rules! uint_overflowing_mul {
(U256, $n_words: expr, $self_expr: expr, $other: expr) => ({ (U256, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 4] = unsafe { mem::uninitialized() }; let mut result: [u64; 4] = unsafe { mem::uninitialized() };
let self_t: &[u64; 4] = unsafe { &mem::transmute($self_expr) }; let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = unsafe { &mem::transmute($other) }; let other_t: &[u64; 4] = &self.0;
let overflow: u64; let overflow: u64;
unsafe { unsafe {
@ -548,6 +548,7 @@ pub trait Uint: Sized + Default + FromStr + From<u64> + fmt::Debug + fmt::Displa
macro_rules! construct_uint { macro_rules! construct_uint {
($name:ident, $n_words:expr) => ( ($name:ident, $n_words:expr) => (
/// Little-endian large integer type /// Little-endian large integer type
#[repr(C)]
#[derive(Copy, Clone, Eq, PartialEq)] #[derive(Copy, Clone, Eq, PartialEq)]
pub struct $name(pub [u64; $n_words]); pub struct $name(pub [u64; $n_words]);
@ -1132,8 +1133,8 @@ impl U256 {
/// No overflow possible /// No overflow possible
#[cfg(all(asm_available, target_arch="x86_64"))] #[cfg(all(asm_available, target_arch="x86_64"))]
pub fn full_mul(self, other: U256) -> U512 { pub fn full_mul(self, other: U256) -> U512 {
let self_t: &[u64; 4] = unsafe { &mem::transmute(self) }; let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = unsafe { &mem::transmute(other) }; let other_t: &[u64; 4] = &other.0;
let mut result: [u64; 8] = unsafe { mem::uninitialized() }; let mut result: [u64; 8] = unsafe { mem::uninitialized() };
unsafe { unsafe {
asm!(" asm!("