First program generation

vm/program.go

@@ -3,5 +3,6 @@ package vm
 type Program struct {
 	GlobalMemorySize   uint64
 	FunctionMemorySize uint64
+	InstructionLimit   uint64
 	Functions          []*Function
 }

vm/state.go

@@ -13,6 +13,8 @@ type State struct {
 	comparisonResult bool
 	globalMemory     *Memory
 	stack            []*stackFrame
+
+	instructionCount uint64
 }
 
 func NewState(prog *Program) (*State, error) {
@@ -70,6 +72,12 @@ func (state *State) processInstruction() {
 	instr := fnc.Instructions[state.instructionIndex]
 	state.instructionIndex += 1
 	instr.opHandler(state, instr)
+	state.instructionCount += 1
+
+	if state.program.InstructionLimit > 0 && state.instructionCount > state.program.InstructionLimit {
+		state.err = fmt.Errorf("Instruction limit (%d) exceeded", state.program.InstructionLimit)
+		state.running = false
+	}
 
 	if state.functionIndex < 0 || state.functionIndex >= int64(len(state.program.Functions)) {
 		state.ret()