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35 lines
808 B
35 lines
808 B
package vm
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/ethutil"
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)
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func analyseJumpDests(code []byte) (dests map[int64]*big.Int) {
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dests = make(map[int64]*big.Int)
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lp := false
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var lpv *big.Int
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for pc := int64(0); pc < int64(len(code)); pc++ {
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var op OpCode = OpCode(code[pc])
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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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a := int64(op) - int64(PUSH1) + 1
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if int64(len(code)) > pc+1+a {
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lpv = ethutil.BigD(code[pc+1 : pc+1+a])
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}
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pc += a
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lp = true
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case JUMP, JUMPI:
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if lp {
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dests[pc] = lpv
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}
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default:
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lp = false
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}
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}
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return
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}
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