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45 lines
1.0 KiB
45 lines
1.0 KiB
10 years ago
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package ethvm
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import (
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"fmt"
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"github.com/ethereum/eth-go/ethutil"
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"math/big"
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)
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func Disassemble(script []byte) (asm []string) {
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pc := new(big.Int)
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for {
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if pc.Cmp(big.NewInt(int64(len(script)))) >= 0 {
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return
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}
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// Get the memory location of pc
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val := script[pc.Int64()]
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// Get the opcode (it must be an opcode!)
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op := OpCode(val)
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asm = append(asm, fmt.Sprintf("%04v: %v", pc, op))
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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:
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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) {
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return nil
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}
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data := script[pc.Int64() : pc.Int64()+a]
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if len(data) == 0 {
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data = []byte{0}
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}
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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))
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}
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pc.Add(pc, ethutil.Big1)
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}
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return
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}
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