Official Go implementation of the Ethereum protocol
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 
go-ethereum/vm/analysis.go

35 lines
797 B

package vm
import (
"math/big"
"github.com/ethgo.old/ethutil"
)
func analyseJumpDests(code []byte) (dests map[int64]*big.Int) {
dests = make(map[int64]*big.Int)
lp := false
var lpv *big.Int
for pc := int64(0); pc < int64(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 := int64(op) - int64(PUSH1) + 1
if int64(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
}