erigon-pulse/vm/analysis.go
obscuren 55e55826ee Changed JUMP(I) behaviour.
* All jumps must land on a JUMPDEST instruction byte.
* The byte may not be part of a PUSH*
2015-01-02 17:35:55 +01:00

22 lines
591 B
Go

package vm
import "gopkg.in/fatih/set.v0"
func analyseJumpDests(code []byte) (dests *set.Set) {
dests = 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
//lp = true
case JUMPDEST:
dests.Add(pc)
}
}
return
}