mirror of https://github.com/poanetwork/quorum.git
37 lines
849 B
Go
37 lines
849 B
Go
package vm
|
|
|
|
import (
|
|
"math/big"
|
|
|
|
"gopkg.in/fatih/set.v0"
|
|
)
|
|
|
|
type destinations struct {
|
|
set *set.Set
|
|
}
|
|
|
|
func (d *destinations) Has(dest *big.Int) bool {
|
|
return d.set.Has(string(dest.Bytes()))
|
|
}
|
|
|
|
func (d *destinations) Add(dest *big.Int) {
|
|
d.set.Add(string(dest.Bytes()))
|
|
}
|
|
|
|
func analyseJumpDests(code []byte) (dests *destinations) {
|
|
dests = &destinations{set.New()}
|
|
|
|
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
|
|
|
|
pc += a
|
|
case JUMPDEST:
|
|
dests.Add(big.NewInt(int64(pc)))
|
|
}
|
|
}
|
|
return
|
|
}
|