grassrootseconomics/openethereum
7
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Using overflowing operations

Browse Source
This commit is contained in:
Tomusdrw 2016-01-15 01:48:53 +01:00
parent e8b9ef202c
commit 66b0e4af35
1 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/evm/interpreter.rs
View File

@ -696,23 +696,27 @@ impl Interpreter {
instructions::ADD => { instructions::ADD => {
let a = stack.pop_back(); let a = stack.pop_back();
let b = stack.pop_back(); let b = stack.pop_back();
stack.push(a + b); let (c, _overflow) = a.overflowing_add(a, b);
stack.push(c);
}, },
instructions::MUL => { instructions::MUL => {
let a = stack.pop_back(); let a = stack.pop_back();
let b = stack.pop_back(); let b = stack.pop_back();
stack.push(a * b); let (c, _overflow) = a.overflowing_mul(a, b);
stack.push(c);
}, },
instructions::SUB => { instructions::SUB => {
let a = stack.pop_back(); let a = stack.pop_back();
let b = stack.pop_back(); let b = stack.pop_back();
stack.push(a - b); let (c, _overflow) = a.overflowing_sub(a, b);
stack.push(c);
}, },
instructions::DIV => { instructions::DIV => {
let a = stack.pop_back(); let a = stack.pop_back();
let b = stack.pop_back(); let b = stack.pop_back();
stack.push(if !self.is_zero(&b) { stack.push(if !self.is_zero(&b) {
a / b let (c, _overflow) = a.overflowing_div(a, b);
c
} else { } else {
U256::zero() U256::zero()
}); });
@ -721,7 +725,8 @@ impl Interpreter {
let a = stack.pop_back(); let a = stack.pop_back();
let b = stack.pop_back(); let b = stack.pop_back();
stack.push(if !self.is_zero(&b) { stack.push(if !self.is_zero(&b) {
a % b let (c, _overflow) = a.overflowing_rem(a, b);
c
} else { } else {
U256::zero() U256::zero()
}); });