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package ethutil
import (
"math/big"
"strconv"
)
// Op codes
var OpCodes = map[string]byte{
// 0x0 range - arithmetic ops
"STOP": 0x00,
"ADD": 0x01,
"MUL": 0x02,
"SUB": 0x03,
"DIV": 0x04,
"SDIV": 0x05,
"MOD": 0x06,
"SMOD": 0x07,
"EXP": 0x08,
"NEG": 0x09,
"LT": 0x0a,
"GT": 0x0b,
"EQ": 0x0c,
"NOT": 0x0d,
// 0x10 range - bit ops
"AND": 0x10,
"OR": 0x11,
"XOR": 0x12,
"BYTE": 0x13,
// 0x20 range - crypto
"SHA3": 0x20,
// 0x30 range - closure state
"ADDRESS": 0x30,
"BALANCE": 0x31,
"ORIGIN": 0x32,
"CALLER": 0x33,
"CALLVALUE": 0x34,
"CALLDATA": 0x35,
"CALLDATASIZE": 0x36,
"GASPRICE": 0x38,
// 0x40 range - block operations
"PREVHASH": 0x40,
"COINBASE": 0x41,
"TIMESTAMP": 0x42,
"NUMBER": 0x43,
"DIFFICULTY": 0x44,
"GASLIMIT": 0x45,
// 0x50 range - 'storage' and execution
"PUSH": 0x50,
"POP": 0x51,
"DUP": 0x52,
"SWAP": 0x53,
"MLOAD": 0x54,
"MSTORE": 0x55,
"MSTORE8": 0x56,
"SLOAD": 0x57,
"SSTORE": 0x58,
"JUMP": 0x59,
"JUMPI": 0x5a,
"PC": 0x5b,
"MSIZE": 0x5c,
// 0x60 range - closures
"CREATE": 0x60,
"CALL": 0x61,
"RETURN": 0x62,
// 0x70 range - other
"LOG": 0x70,
"SUICIDE": 0x7f,
}
func IsOpCode(s string) bool {
for key, _ := range OpCodes {
if key == s {
return true
}
}
return false
}
func CompileInstr(s interface{}) ([]byte, error) {
switch s.(type) {
case string:
str := s.(string)
isOp := IsOpCode(str)
if isOp {
return []byte{OpCodes[str]}, nil
}
num := new(big.Int)
_, success := num.SetString(str, 0)
// Assume regular bytes during compilation
if !success {
num.SetBytes([]byte(str))
}
return num.Bytes(), nil
case int:
return big.NewInt(int64(s.(int))).Bytes(), nil
case []byte:
return BigD(s.([]byte)).Bytes(), nil
}
return nil, nil
}
func Instr(instr string) (int, []string, error) {
base := new(big.Int)
base.SetString(instr, 0)
args := make([]string, 7)
for i := 0; i < 7; i++ {
// int(int(val) / int(math.Pow(256,float64(i)))) % 256
exp := BigPow(256, i)
num := new(big.Int)
num.Div(base, exp)
args[i] = num.Mod(num, big.NewInt(256)).String()
}
op, _ := strconv.Atoi(args[0])
return op, args[1:7], nil
}
// Script compilation functions
// Compiles strings to machine code
func Assemble(instructions ...interface{}) (script []string) {
script = make([]string, len(instructions))
for i, val := range instructions {
instr, _ := CompileInstr(val)
script[i] = string(instr)
}
return
}
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