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package vm
import (
"jinx/pkg/lang/vm/code"
"jinx/pkg/lang/vm/mem"
"jinx/pkg/lang/vm/stack"
)
type VM struct {
code *code.Code
pc int
stack stack.Stack
memory mem.Mem
}
func New(code *code.Code) *VM {
vm := &VM{
code: code,
pc: 0,
stack: stack.New(),
memory: mem.New(),
}
if err := vm.setup(); err != nil {
panic(err)
}
return vm
}
func (vm *VM) GetResult() (string, error) {
if vm.stack.Len() == 0 {
return "", stack.ErrStackUnderflow
}
res, err := vm.stack.Get(vm.stack.Len() - 1)
if err != nil {
return "", err
}
if str, err := res.Data().String(vm.memory); err == nil {
return str, nil
} else {
return "", err
}
}
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
err = 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:
err = vm.execPushObject()
case code.OpPushType:
name, advance := vm.code.GetString(vm.pc)
vm.pc += advance
err = vm.execPushType(name)
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.OpSetLocal:
offset, advance := vm.code.GetInt(vm.pc)
vm.pc += advance
err = vm.execSetLocal(int(offset))
case code.OpGetMember:
name, advance := vm.code.GetString(vm.pc)
vm.pc += advance
err = vm.execGetMember(name)
case code.OpSetMember:
name, advance := vm.code.GetString(vm.pc)
vm.pc += advance
err = vm.execSetMember(name)
case code.OpGetEnv:
envIndex, advance := vm.code.GetUint(vm.pc)
vm.pc += advance
err = vm.execGetEnv(int(envIndex))
case code.OpSetEnv:
envIndex, advance := vm.code.GetUint(vm.pc)
vm.pc += advance
err = vm.execSetEnv(int(envIndex))
case code.OpAddToEnv:
local, advance := vm.code.GetUint(vm.pc)
vm.pc += advance
err = vm.execAddToEnv(int(local))
case code.OpAnchorType:
err = vm.execAnchorType()
case code.OpAdd:
err = vm.execAdd()
case code.OpSub:
err = vm.execSub()
case code.OpMod:
err = vm.execMod()
case code.OpIndex:
err = vm.execIndex()
case code.OpLte:
err = vm.execLte()
case code.OpCall:
argCount, advance := vm.code.GetUint(vm.pc)
vm.pc += advance
err = vm.execCall(uint(argCount))
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
}
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