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|
package vm
import (
"fmt"
"jinx/pkg/lang/vm/code"
)
type VM struct {
code *code.Code
pc int
stack CallStack
}
func New(code *code.Code) *VM {
return &VM{
code: code,
pc: 0,
stack: NewCallStack(),
}
}
func (vm *VM) GetResult() (string, error) {
res, err := vm.stack.Top().Pop()
if err != nil {
return "", err
}
return fmt.Sprintf("%v", res.Data()), 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,
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:
panic("not implemented")
case code.OpPushObject:
panic("not implemented")
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.OpGetArg:
vm.execGetArg()
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.OpCall:
panic("not implemented")
case code.OpJmp:
pc, _ := vm.code.GetUint(vm.pc)
vm.pc = int(pc)
case code.OpJez:
panic("not implemented")
case code.OpRet:
panic("not implemented")
default:
err = ErrInvalidOp{Op: uint8(op)}
}
return stepDecisionContinue, err
}
|
