Changed JUMP(I) behaviour.

* All jumps must land on a JUMPDEST instruction byte.
* The byte may not be part of a PUSH*

vm/analysis.go

@@ -1,34 +1,20 @@
 package vm
 
-import (
-	"math/big"
+import "gopkg.in/fatih/set.v0"
 
-	"github.com/ethereum/go-ethereum/ethutil"
-)
+func analyseJumpDests(code []byte) (dests *set.Set) {
+	dests = set.New()
 
-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
+			//lp = true
+		case JUMPDEST:
+			dests.Add(pc)
 		}
 	}
 	return