mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-02-26 15:47:21 +00:00
83663ed4b0
* Renamed a couple more chain => core * Updated VM `pc` to be uint64 rather than big int * XEth interface cleanup
35 lines
815 B
Go
35 lines
815 B
Go
package vm
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"github.com/ethereum/go-ethereum/ethutil"
|
|
)
|
|
|
|
func analyseJumpDests(code []byte) (dests map[uint64]*big.Int) {
|
|
dests = make(map[uint64]*big.Int)
|
|
|
|
lp := false
|
|
var lpv *big.Int
|
|
for pc := uint64(0); pc < uint64(len(code)); pc++ {
|
|
var op OpCode = OpCode(code[pc])
|
|
switch op {
|
|
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:
|
|
a := uint64(op) - uint64(PUSH1) + 1
|
|
if uint64(len(code)) > pc+1+a {
|
|
lpv = ethutil.BigD(code[pc+1 : pc+1+a])
|
|
}
|
|
|
|
pc += a
|
|
lp = true
|
|
case JUMP, JUMPI:
|
|
if lp {
|
|
dests[pc] = lpv
|
|
}
|
|
|
|
default:
|
|
lp = false
|
|
}
|
|
}
|
|
return
|
|
}
|