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use copy_from_slice instead of for loop (#5647)

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Guanqun Lu 2017-05-18 05:46:14 -05:00 committed by Gav Wood
parent b1eab698d2
commit 6d81b8a49a
1 changed files with 49 additions and 26 deletions
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79
ethcore/src/evm/interpreter/memory.rs
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@ -86,10 +86,7 @@ impl Memory for Vec<u8> {
fn write_slice(&mut self, offset: U256, slice: &[u8]) {
let off = offset.low_u64() as usize;
// TODO [todr] Optimize?
for pos in off..off+slice.len() {
self[pos] = slice[pos - off];
}
self[off..off+slice.len()].copy_from_slice(slice);
}
fn write(&mut self, offset: U256, value: U256) {
@ -114,31 +111,57 @@ impl Memory for Vec<u8> {
}
}
#[cfg(test)]
mod tests {
use util::U256;
use super::Memory;
#[test]
fn test_memory_read_and_write() {
// given
let mem: &mut Memory = &mut vec![];
mem.resize(0x80 + 32);
#[test]
fn test_memory_read_and_write() {
// given
let mem: &mut Memory = &mut vec![];
mem.resize(0x80 + 32);
// when
mem.write(U256::from(0x80), U256::from(0xabcdef));
// when
mem.write(U256::from(0x80), U256::from(0xabcdef));
// then
assert_eq!(mem.read(U256::from(0x80)), U256::from(0xabcdef));
}
#[test]
fn test_memory_read_and_write_byte() {
// given
let mem: &mut Memory = &mut vec![];
mem.resize(32);
// when
mem.write_byte(U256::from(0x1d), U256::from(0xab));
mem.write_byte(U256::from(0x1e), U256::from(0xcd));
mem.write_byte(U256::from(0x1f), U256::from(0xef));
// then
assert_eq!(mem.read(U256::from(0x00)), U256::from(0xabcdef));
// then
assert_eq!(mem.read(U256::from(0x80)), U256::from(0xabcdef));
}
#[test]
fn test_memory_read_and_write_byte() {
// given
let mem: &mut Memory = &mut vec![];
mem.resize(32);
// when
mem.write_byte(U256::from(0x1d), U256::from(0xab));
mem.write_byte(U256::from(0x1e), U256::from(0xcd));
mem.write_byte(U256::from(0x1f), U256::from(0xef));
// then
assert_eq!(mem.read(U256::from(0x00)), U256::from(0xabcdef));
}
#[test]
fn test_memory_read_slice_and_write_slice() {
let mem: &mut Memory = &mut vec![];
mem.resize(32);
{
let slice = "abcdefghijklmnopqrstuvwxyz012345".as_bytes();
mem.write_slice(U256::from(0), slice);
assert_eq!(mem.read_slice(U256::from(0), U256::from(32)), slice);
}
// write again
{
let slice = "67890".as_bytes();
mem.write_slice(U256::from(0x1), slice);
assert_eq!(mem.read_slice(U256::from(0), U256::from(7)), "a67890g".as_bytes());
}
}
}