Function evmil::util::from_be_bytes

source · 
pub fn from_be_bytes(bytes: &[u8]) -> u128
Expand description

Convert a sequence of bytes in big endian form into a 128bit value.

Examples found in repository?
src/cfa.rs (line 145)
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    fn transfer(self, insn: &Instruction) -> CfaState {
        match insn {
            STOP => CfaState::bottom(),
            // 0s: Stop and Arithmetic Operations
            ADD|MUL|SUB|DIV|SDIV|MOD|SMOD|EXP|SIGNEXTEND => {
                self.pop().pop().push(UNKNOWN)
            }
            ADDMOD|MULMOD => {
                self.pop().pop().pop().push(UNKNOWN)
            }
            // 0s: Stop and Arithmetic Operations
            ISZERO|NOT => {
                self.pop().push(UNKNOWN)
            }
            // Binary Comparators
            LT|GT|SLT|SGT|EQ => {
                self.pop().pop().push(UNKNOWN)
            }
            // Binary bitwise operators
            AND|OR|XOR|BYTE|SHL|SHR|SAR => {
                self.pop().pop().push(UNKNOWN)
            }
            // 20s: Keccak256
            // 30s: Environmental Information
            CALLVALUE => self.push(UNKNOWN),
            CALLDATALOAD => self.pop().push(UNKNOWN),
            CALLDATASIZE => self.push(UNKNOWN),
            // 40s: Block Information
            // 50s: Stack, Memory, Storage and Flow Operations
            POP => self.pop(),
            MLOAD => self.pop().push(UNKNOWN),
            MSTORE => self.pop().pop(),
            SLOAD => self.pop().push(UNKNOWN),
            SSTORE => self.pop().pop(),
            JUMPI => self.pop().pop(),
            JUMPDEST(_) => self, // nop
            // 60 & 70s: Push Operations
            PUSH(bytes) => {
                let n = util::from_be_bytes(&bytes);
                if n <= MAX_CODE_SIZE {
                    self.push(AbstractValue::Known(n as usize))
                } else {
                    self.push(UNKNOWN)
                }
            }
            // 80s: Duplicate Operations
            DUP(n) => {
                let m = (*n - 1) as usize;
                let nth = self.peek(m);
                self.push(nth)
            }
            // 90s: Swap Operations
            SWAP(n) => {
                let m = (*n - 1) as usize;
                let x = self.peek(m);
                let y = self.peek(0);
                self.set(0,x).set(m,y)
            }
            // 90s: Exchange Operations
            // a0s: Logging Operations
            // f0s: System Operations
            INVALID|JUMP|RETURN|REVERT => {
                CfaState::bottom()
            }
            _ => {
                // This is a catch all to ensure no instructions are
                // missed above.
                panic!("unknown instruction ({:?})",insn);
            }
        }
    }