package asm

import "github.com/firestuff/subcoding/vm"

var opCodeByName = map[string]vm.OpCodeType{
	"noop":   vm.OpNoOp,
	"nop":    vm.OpNop,
	"call":   vm.OpCall,
	"cal":    vm.OpCal,
	"return": vm.OpReturn,
	"ret":    vm.OpRet,

	"move": vm.OpMove,
	"mov":  vm.OpMov,

	"add":            vm.OpAdd,
	"subtract":       vm.OpSubtract,
	"sub":            vm.OpSub,
	"multiply":       vm.OpMultiply,
	"mul":            vm.OpMul,
	"divideunsigned": vm.OpDivideUnsigned,
	"divu":           vm.OpDivU,
	"dividesigned":   vm.OpDivideSigned,
	"divs":           vm.OpDivS,

	"isequal":                      vm.OpIsEqual,
	"eq":                           vm.OpEq,
	"islessthanunsigned":           vm.OpIsLessThanUnsigned,
	"ltu":                          vm.OpLTU,
	"islessthansigned":             vm.OpIsLessThanSigned,
	"lts":                          vm.OpLTS,
	"isgreaterthanunsigned":        vm.OpIsGreaterThanUnsigned,
	"gtu":                          vm.OpGTU,
	"isgreaterthansigned":          vm.OpIsGreaterThanSigned,
	"gts":                          vm.OpGTS,
	"islessthanorequalunsigned":    vm.OpIsLessThanOrEqualUnsigned,
	"lteu":                         vm.OpLTEU,
	"islessthanorequalsigned":      vm.OpIsLessThanOrEqualSigned,
	"ltes":                         vm.OpLTES,
	"isgreaterthanorequalunsigned": vm.OpIsGreaterThanOrEqualUnsigned,
	"gteu":                         vm.OpGTEU,
	"isgreaterthanorequalsigned":   vm.OpIsGreaterThanOrEqualSigned,
	"gtes":                         vm.OpGTES,

	"jump":        vm.OpJump,
	"jmp":         vm.OpJmp,
	"jumpiftrue":  vm.OpJumpIfTrue,
	"jmpt":        vm.OpJmpT,
	"jumpiffalse": vm.OpJumpIfFalse,
	"jmpf":        vm.OpJmpF,
}

type operandType int

const (
	u  operandType = 0
	s              = 1
	us             = 2
	r              = 3
)

var operandsByOpCode = map[vm.OpCodeType][]operandType{
	vm.OpNop: []operandType{},
	vm.OpCal: []operandType{s},
	vm.OpRet: []operandType{},

	vm.OpMov:  []operandType{r, us},
	vm.OpAdd:  []operandType{r, us},
	vm.OpSub:  []operandType{r, us},
	vm.OpMul:  []operandType{r, us},
	vm.OpDivU: []operandType{r, u},
	vm.OpDivS: []operandType{r, s},

	vm.OpEq:   []operandType{us, us},
	vm.OpLTU:  []operandType{u, u},
	vm.OpLTS:  []operandType{s, s},
	vm.OpGTU:  []operandType{u, u},
	vm.OpGTS:  []operandType{s, s},
	vm.OpLTEU: []operandType{u, u},
	vm.OpLTES: []operandType{s, s},
	vm.OpGTEU: []operandType{u, u},
	vm.OpGTES: []operandType{s, s},

	vm.OpJmp:  []operandType{s},
	vm.OpJmpT: []operandType{s},
	vm.OpJmpF: []operandType{s},
}