Fixed VM and added static analysis for EVM jumps

vm/types.go

@@ -173,22 +173,23 @@ const (
 // Since the opcodes aren't all in order we can't use a regular slice
 var opCodeToString = map[OpCode]string{
 	// 0x0 range - arithmetic ops
-	STOP:   "STOP",
-	ADD:    "ADD",
-	MUL:    "MUL",
-	SUB:    "SUB",
-	DIV:    "DIV",
-	SDIV:   "SDIV",
-	MOD:    "MOD",
-	SMOD:   "SMOD",
-	EXP:    "EXP",
-	NOT:    "NOT",
-	LT:     "LT",
-	GT:     "GT",
-	SLT:    "SLT",
-	SGT:    "SGT",
-	EQ:     "EQ",
-	ISZERO: "ISZERO",
+	STOP:       "STOP",
+	ADD:        "ADD",
+	MUL:        "MUL",
+	SUB:        "SUB",
+	DIV:        "DIV",
+	SDIV:       "SDIV",
+	MOD:        "MOD",
+	SMOD:       "SMOD",
+	EXP:        "EXP",
+	NOT:        "NOT",
+	LT:         "LT",
+	GT:         "GT",
+	SLT:        "SLT",
+	SGT:        "SGT",
+	EQ:         "EQ",
+	ISZERO:     "ISZERO",
+	SIGNEXTEND: "SIGNEXTEND",
 
 	// 0x10 range - bit ops
 	AND:    "AND",