plugeth/ethchain/asm.go

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package ethchain
import (
"fmt"
"github.com/ethereum/eth-go/ethutil"
"math/big"
)
func Disassemble(script []byte) (asm []string) {
pc := new(big.Int)
for {
if pc.Cmp(big.NewInt(int64(len(script)))) >= 0 {
return
}
// Get the memory location of pc
val := script[pc.Int64()]
// Get the opcode (it must be an opcode!)
op := OpCode(val)
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asm = append(asm, fmt.Sprintf("%04v: %v", pc, op))
switch op {
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case PUSH1, PUSH2, PUSH3, PUSH4, PUSH5, PUSH6, PUSH7, PUSH8, PUSH9, PUSH10, PUSH11, PUSH12, PUSH13, PUSH14, PUSH15, PUSH16, PUSH17, PUSH18, PUSH19, PUSH20, PUSH21, PUSH22, PUSH23, PUSH24, PUSH25, PUSH26, PUSH27, PUSH28, PUSH29, PUSH30, PUSH31, PUSH32:
pc.Add(pc, ethutil.Big1)
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a := int64(op) - int64(PUSH1) + 1
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if int(pc.Int64()+a) > len(script) {
return
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}
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data := script[pc.Int64() : pc.Int64()+a]
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if len(data) == 0 {
data = []byte{0}
}
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asm = append(asm, fmt.Sprintf("%04v: 0x%x", pc, data))
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pc.Add(pc, big.NewInt(a-1))
}
pc.Add(pc, ethutil.Big1)
}
return asm
}