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Optimize couple of access methods

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This commit is contained in:
Tomusdrw 2016-01-14 01:05:01 +01:00
parent f38c99b285
commit dedf340381
1 changed files with 12 additions and 23 deletions
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35
src/evm/interpreter.rs
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@ -156,18 +156,9 @@ struct CodeReader<'a> {
impl<'a> CodeReader<'a> {
/// Get `no_of_bytes` from code and convert to U256. Move PC
fn read(&mut self, no_of_bytes: usize) -> U256 {
let mut value = U256::from(self.code[self.position]);
for off in 1..no_of_bytes {
let pos = self.position + off;
value = value << 8;
// TODO [todr] Directly bitor with u8?
value = value | U256::from(self.code[pos]);
}
// Move PC
let pos = self.position;
self.position += no_of_bytes;
value
U256::from(&self.code[pos..pos+no_of_bytes])
}
fn len (&self) -> usize {
@ -194,9 +185,8 @@ impl evm::Evm for Interpreter {
let code = &params.code;
let valid_jump_destinations = self.find_jump_destinations(&code);
// TODO reserve stack
let mut current_gas = params.gas.clone();
let mut stack = vec![];
let mut stack = Vec::with_capacity(ext.schedule().stack_limit);
let mut mem = vec![];
let mut reader = CodeReader {
position: 0,
@ -481,7 +471,6 @@ impl Interpreter {
return Ok(InstructionResult::StopExecution);
},
instructions::SUICIDE => {
// TODO [todr] Suicide should have argument with address of contract that funds should be transfered to
let address = stack.pop_back();
ext.suicide(&u256_to_address(&address));
return Ok(InstructionResult::StopExecution);
@ -722,9 +711,9 @@ impl Interpreter {
U256::zero()
});
},
// instructions::SDIV => {},
// instructions::SMOD => {},
// instructions::EXP => {},
// TODO instructions::SDIV => {},
// TODO instructions::SMOD => {},
// TODO instructions::EXP => {},
instructions::NOT => {
let a = stack.pop_back();
stack.push(!a);
@ -734,13 +723,13 @@ impl Interpreter {
let b = stack.pop_back();
stack.push(self.bool_to_u256(a < b));
},
// instructions::SLT => {},
// TODO instructions::SLT => {},
instructions::GT => {
let a = stack.pop_back();
let b = stack.pop_back();
stack.push(self.bool_to_u256(a > b));
},
// instructions::SGT => {},
// TODO instructions::SGT => {},
instructions::EQ => {
let a = stack.pop_back();
let b = stack.pop_back();
@ -765,10 +754,10 @@ impl Interpreter {
let b = stack.pop_back();
stack.push(a ^ b);
},
// instructions::BYTE => {},
// instructions::ADDMOD => {},
// instructions::MULMOD => {},
// instructions::SIGNEXTEND => {},
// TODO instructions::BYTE => {},
// TODO instructions::ADDMOD => {},
// TODO instructions::MULMOD => {},
// TODO instructions::SIGNEXTEND => {},
_ => panic!(format!("Unknown stack instruction: {:x}", instruction))
}
}