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package vm
import (
"jinx/pkg/lang/vm/code"
"jinx/pkg/lang/vm/mem"
"jinx/pkg/lang/vm/value"
)
type VM struct {
code *code.Code
pc int
stack Stack
memory mem.Mem
}
func New(code *code.Code) *VM {
return &VM{
code: code,
pc: 0,
stack: NewStack(),
memory: mem.New(),
}
}
func (vm *VM) GetResult() (string, error) {
res, err := vm.stack.Pop()
if err != nil {
return "", err
}
str := res.Data().String(&vm.memory)
return str, nil
}
func (vm *VM) Run() error {
for vm.pc < vm.code.Len() {
op, advance := vm.code.GetOp(vm.pc)
vm.pc += advance
if decision, err := vm.step(op); err != nil {
return Error{
Pc: vm.pc,
Line: vm.code.Debug().PCToLine(vm.pc),
Err: err,
}
} else if decision == stepDecisionHalt {
return nil
}
}
return nil
}
type stepDecision int
const (
stepDecisionContinue stepDecision = iota
stepDecisionHalt
)
func (vm *VM) step(op code.Op) (stepDecision, error) {
var err error
switch op {
case code.OpNop:
// do nothing
case code.OpHalt:
return stepDecisionHalt, nil
case code.OpPushInt:
x, advance := vm.code.GetInt(vm.pc)
vm.pc += advance
vm.execPushInt(x)
case code.OpPushFloat:
x, advance := vm.code.GetFloat(vm.pc)
vm.pc += advance
vm.execPushFloat(x)
case code.OpPushString:
str, advance := vm.code.GetString(vm.pc)
vm.pc += advance
vm.execPushString(str)
case code.OpPushNull:
vm.execPushNull()
case code.OpPushTrue:
vm.execPushBool(true)
case code.OpPushFalse:
vm.execPushBool(false)
case code.OpPushArray:
vm.execPushArray()
case code.OpPushFunction:
x, advance := vm.code.GetUint(vm.pc)
vm.pc += advance
vm.execPushFunction(int(x))
case code.OpPushObject:
panic("not implemented")
case code.OpShift:
by, advance := vm.code.GetInt(vm.pc)
vm.pc += advance
err = vm.stack.ShiftTopCallBase(int(by))
case code.OpDrop:
_, err = vm.stack.Pop()
case code.OpGetGlobal:
panic("not implemented")
case code.OpGetLocal:
offset, advance := vm.code.GetInt(vm.pc)
vm.pc += advance
err = vm.execGetLocal(int(offset))
case code.OpGetMember:
panic("not implemented")
case code.OpGetMethod:
panic("not implemented")
case code.OpGetEnv:
panic("not implemented")
case code.OpAdd:
err = vm.execAdd()
case code.OpSub:
err = vm.execSub()
case code.OpIndex:
err = vm.execIndex()
case code.OpLte:
err = vm.execLte()
case code.OpCall:
err = vm.execCall()
case code.OpJmp:
pc, _ := vm.code.GetUint(vm.pc)
vm.pc = int(pc)
case code.OpJt:
pc, advance := vm.code.GetUint(vm.pc)
vm.pc += advance
err = vm.execJumpIf(int(pc), true)
case code.OpJf:
pc, advance := vm.code.GetUint(vm.pc)
vm.pc += advance
err = vm.execJumpIf(int(pc), false)
case code.OpRet:
err = vm.execRet()
case code.OpTempArrLen:
err = vm.execTempArrLen()
case code.OpTempArrPush:
err = vm.execTempArrPush()
default:
err = ErrInvalidOp{Op: uint8(op)}
}
return stepDecisionContinue, err
}
func (vm *VM) popAndDrop() (value.Value, error) {
v, err := vm.stack.Pop()
if err != nil {
return value.Value{}, err
}
v.Drop(&vm.memory)
return v, nil
}
func (vm *VM) popCallAndDrop() (int, error) {
for !vm.stack.ReachedBaseOfCall() {
_, err := vm.popAndDrop()
if err != nil {
return 0, err
}
}
return vm.stack.PopCall()
}
|
