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Merge pull request #1236 from rphmeier/hash_unsafety

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remove unsafety from util/hash.rs and util/bigint/uint.rs
This commit is contained in:
Arkadiy Paronyan 2016-06-10 14:11:36 +02:00 committed by GitHub
commit 3e7d8bf1a8
2 changed files with 54 additions and 85 deletions
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25
util/bigint/src/uint.rs
View File

@ -92,8 +92,8 @@ macro_rules! uint_overflowing_add_reg {
macro_rules! uint_overflowing_add {
(U256, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 4] = unsafe { mem::uninitialized() };
let self_t: &[u64; 4] = unsafe { &mem::transmute($self_expr) };
let other_t: &[u64; 4] = unsafe { &mem::transmute($other) };
let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = &other.0;
let overflow: u8;
unsafe {
@ -115,8 +115,8 @@ macro_rules! uint_overflowing_add {
});
(U512, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 8] = unsafe { mem::uninitialized() };
let self_t: &[u64; 8] = unsafe { &mem::transmute($self_expr) };
let other_t: &[u64; 8] = unsafe { &mem::transmute($other) };
let self_t: &[u64; 8] = &self.0;
let other_t: &[u64; 8] = &other.0;
let overflow: u8;
@ -196,8 +196,8 @@ macro_rules! uint_overflowing_sub_reg {
macro_rules! uint_overflowing_sub {
(U256, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 4] = unsafe { mem::uninitialized() };
let self_t: &[u64; 4] = unsafe { &mem::transmute($self_expr) };
let other_t: &[u64; 4] = unsafe { &mem::transmute($other) };
let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = &other.0;
let overflow: u8;
unsafe {
@ -218,8 +218,8 @@ macro_rules! uint_overflowing_sub {
});
(U512, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 8] = unsafe { mem::uninitialized() };
let self_t: &[u64; 8] = unsafe { &mem::transmute($self_expr) };
let other_t: &[u64; 8] = unsafe { &mem::transmute($other) };
let self_t: &[u64; 8] = &self.0;
let other_t: &[u64; 8] = &other.0;
let overflow: u8;
@ -270,8 +270,8 @@ macro_rules! uint_overflowing_sub {
macro_rules! uint_overflowing_mul {
(U256, $n_words: expr, $self_expr: expr, $other: expr) => ({
let mut result: [u64; 4] = unsafe { mem::uninitialized() };
let self_t: &[u64; 4] = unsafe { &mem::transmute($self_expr) };
let other_t: &[u64; 4] = unsafe { &mem::transmute($other) };
let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = &self.0;
let overflow: u64;
unsafe {
@ -548,6 +548,7 @@ pub trait Uint: Sized + Default + FromStr + From<u64> + fmt::Debug + fmt::Displa
macro_rules! construct_uint {
($name:ident, $n_words:expr) => (
/// Little-endian large integer type
#[repr(C)]
#[derive(Copy, Clone, Eq, PartialEq)]
pub struct $name(pub [u64; $n_words]);
@ -1132,8 +1133,8 @@ impl U256 {
/// No overflow possible
#[cfg(all(asm_available, target_arch="x86_64"))]
pub fn full_mul(self, other: U256) -> U512 {
let self_t: &[u64; 4] = unsafe { &mem::transmute(self) };
let other_t: &[u64; 4] = unsafe { &mem::transmute(other) };
let self_t: &[u64; 4] = &self.0;
let other_t: &[u64; 4] = &other.0;
let mut result: [u64; 8] = unsafe { mem::uninitialized() };
unsafe {
asm!("

72
util/src/hash.rs
View File

@ -143,6 +143,7 @@ macro_rules! impl_hash {
}
min
}
fn from_slice(src: &[u8]) -> Self {
let mut r = Self::new();
r.clone_from_slice(src);
@ -150,24 +151,15 @@ macro_rules! impl_hash {
}
fn copy_to(&self, dest: &mut[u8]) {
unsafe {
let min = ::std::cmp::min($size, dest.len());
::std::ptr::copy(self.0.as_ptr(), dest.as_mut_ptr(), min);
}
dest[..min].copy_from_slice(&self.0[..min]);
}
fn shift_bloomed<'a, T>(&'a mut self, b: &T) -> &'a mut Self where T: FixedHash {
let bp: Self = b.bloom_part($size);
let new_self = &bp | self;
// impl |= instead
// TODO: that's done now!
unsafe {
use std::{mem, ptr};
ptr::copy(new_self.0.as_ptr(), self.0.as_mut_ptr(), mem::size_of::<Self>());
}
self.0 = new_self.0;
self
}
@ -179,7 +171,6 @@ macro_rules! impl_hash {
let bloom_bits = m * 8;
let mask = bloom_bits - 1;
let bloom_bytes = (log2(bloom_bits) + 7) / 8;
//println!("bb: {}", bloom_bytes);
// must be a power of 2
assert_eq!(m & (m - 1), 0);
@ -316,14 +307,11 @@ macro_rules! impl_hash {
#[cfg_attr(feature="dev", allow(expl_impl_clone_on_copy))]
impl Clone for $from {
fn clone(&self) -> $from {
unsafe {
use std::{mem, ptr};
let mut ret: $from = mem::uninitialized();
ptr::copy(self.0.as_ptr(), ret.0.as_mut_ptr(), mem::size_of::<$from>());
let mut ret = $from::new();
ret.0.copy_from_slice(&self.0);
ret
}
}
}
impl PartialEq for $from {
fn eq(&self, other: &Self) -> bool {
@ -404,16 +392,13 @@ macro_rules! impl_hash {
type Output = $from;
fn bitor(self, rhs: Self) -> Self::Output {
unsafe {
use std::mem;
let mut ret: $from = mem::uninitialized();
let mut ret: $from = $from::default();
for i in 0..$size {
ret.0[i] = self.0[i] | rhs.0[i];
}
ret
}
}
}
/// Moving `BitOr`
impl BitOr for $from {
@ -429,16 +414,13 @@ macro_rules! impl_hash {
type Output = $from;
fn bitand(self, rhs: Self) -> Self::Output {
unsafe {
use std::mem;
let mut ret: $from = mem::uninitialized();
let mut ret: $from = $from::default();
for i in 0..$size {
ret.0[i] = self.0[i] & rhs.0[i];
}
ret
}
}
}
/// Moving `BitAnd`
impl BitAnd for $from {
@ -454,16 +436,13 @@ macro_rules! impl_hash {
type Output = $from;
fn bitxor(self, rhs: Self) -> Self::Output {
unsafe {
use std::mem;
let mut ret: $from = mem::uninitialized();
let mut ret: $from = $from::default();
for i in 0..$size {
ret.0[i] = self.0[i] ^ rhs.0[i];
}
ret
}
}
}
/// Moving `BitXor`
impl BitXor for $from {
@ -516,23 +495,19 @@ macro_rules! impl_hash {
impl From<U256> for H256 {
fn from(value: U256) -> H256 {
unsafe {
let mut ret: H256 = ::std::mem::uninitialized();
let mut ret = H256::new();
value.to_raw_bytes(&mut ret);
ret
}
}
}
impl<'a> From<&'a U256> for H256 {
fn from(value: &'a U256) -> H256 {
unsafe {
let mut ret: H256 = ::std::mem::uninitialized();
let mut ret: H256 = H256::new();
value.to_raw_bytes(&mut ret);
ret
}
}
}
impl From<H256> for U256 {
fn from(value: H256) -> U256 {
@ -548,53 +523,46 @@ impl<'a> From<&'a H256> for U256 {
impl From<H256> for Address {
fn from(value: H256) -> Address {
unsafe {
let mut ret: Address = ::std::mem::uninitialized();
::std::ptr::copy(value.as_ptr().offset(12), ret.as_mut_ptr(), 20);
let mut ret = Address::new();
ret.0.copy_from_slice(&value[12..32]);
ret
}
}
}
impl From<H256> for H64 {
fn from(value: H256) -> H64 {
unsafe {
let mut ret: H64 = ::std::mem::uninitialized();
::std::ptr::copy(value.as_ptr().offset(20), ret.as_mut_ptr(), 8);
let mut ret = H64::new();
ret.0.copy_from_slice(&value[20..28]);
ret
}
}
}
/*
impl<'a> From<&'a H256> for Address {
fn from(value: &'a H256) -> Address {
unsafe {
let mut ret: Address = ::std::mem::uninitialized();
::std::ptr::copy(value.as_ptr().offset(12), ret.as_mut_ptr(), 20);
let mut ret = Address::new();
ret.0.copy_from_slice(&value[12..32]);
ret
}
}
}
*/
impl From<Address> for H256 {
fn from(value: Address) -> H256 {
unsafe {
let mut ret = H256::new();
::std::ptr::copy(value.as_ptr(), ret.as_mut_ptr().offset(12), 20);
ret.0[12..32].copy_from_slice(&value);
ret
}
}
}
impl<'a> From<&'a Address> for H256 {
fn from(value: &'a Address) -> H256 {
unsafe {
let mut ret = H256::new();
::std::ptr::copy(value.as_ptr(), ret.as_mut_ptr().offset(12), 20);
ret.0[12..32].copy_from_slice(value);
ret
}
}
}
/// Convert string `s` to an `H256`. Will panic if `s` is not 64 characters long or if any of
/// those characters are not 0-9, a-z or A-Z.