Changed JUMP(I) behaviour.

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

tests/vm/gh_test.go

@@ -78,6 +78,12 @@ func RunVmTest(p string, t *testing.T) {
 	helper.CreateFileTests(t, p, &tests)
 
 	for name, test := range tests {
+		/*
+			helper.Logger.SetLogLevel(5)
+			if name != "jump0_jumpdest2" {
+				continue
+			}
+		*/
 		statedb := state.New(helper.NewTrie())
 		for addr, account := range test.Pre {
 			obj := StateObjectFromAccount(addr, account)
@@ -127,7 +133,7 @@ func RunVmTest(p string, t *testing.T) {
 
 		if isVmTest {
 			if len(test.Gas) == 0 && err == nil {
-				t.Errorf("%s's gas unspecified, indicating an error. VM returned (incorrectly) successfull")
+				t.Errorf("%s's gas unspecified, indicating an error. VM returned (incorrectly) successfull", name)
 			} else {
 				gexp := ethutil.Big(test.Gas)
 				if gexp.Cmp(gas) != 0 {

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

vm/vm_debug.go

@@ -83,30 +83,14 @@ func (self *DebugVm) Run(me, caller ContextRef, code []byte, value, gas, price *
 		jump = func(from uint64, to *big.Int) {
 			p := to.Uint64()
 
-			self.Printf(" ~> %v", to)
-			/* NOTE: new model. Will change soon
-			nop := OpCode(context.GetOp(p))
-			if nop != JUMPDEST {
-				panic(fmt.Sprintf("invalid jump destination (%v) %v", nop, p))
-			}
-
-			pc = to.Uint64()
-			*/
-			// Return to start
-			if p == 0 {
-				pc = 0
-			} else {
 			nop := OpCode(context.GetOp(p))
-				if !(nop == JUMPDEST || destinations[from] != nil) {
+			if !destinations.Has(p) {
 				panic(fmt.Sprintf("invalid jump destination (%v) %v", nop, p))
-				} else if nop == JUMP || nop == JUMPI {
-					panic(fmt.Sprintf("not allowed to JUMP(I) in to JUMP"))
 			}
 
+			self.Printf(" ~> %v", to)
 			pc = to.Uint64()
 
-			}
-
 			self.Endl()
 		}
 	)