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|
package main
import (
"fmt"
"strconv"
"strings"
)
func parseOffset(param string) (string, uint16, error) {
if strings.Contains(param, "+") {
labelParts := strings.Split(param, "+")
if len(labelParts) != 2 {
return "", 0, fmt.Errorf(
"Labels with offset should have exactly 1 offset (in \"%s\")",
param,
)
}
labelWithoutOffset := labelParts[0]
o, err := strconv.ParseUint(labelParts[1], 0, 16)
if err != nil {
return "", 0, fmt.Errorf("Error while parsing label offset: %w", err)
}
offset := uint16(o)
return labelWithoutOffset, offset, nil
}
return param, 0, nil
}
func Reg8(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
switch param {
case "A":
return 7, nil
case "B":
return 0, nil
case "C":
return 1, nil
case "D":
return 2, nil
case "E":
return 3, nil
case "H":
return 4, nil
case "L":
return 5, nil
case "(HL)":
return 6, nil
}
return 0, fmt.Errorf("Invalid reg8")
}
func A(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
if param == "A" {
return 0, nil
}
return 0, fmt.Errorf("Invalid A")
}
func HL(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
if param == "HL" {
return 0, nil
}
return 0, fmt.Errorf("Invalid HL")
}
func SP(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
if param == "SP" {
return 0, nil
}
return 0, fmt.Errorf("Invalid SP")
}
func IndirectC(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
if param == "(C)" {
return 0, nil
}
return 0, fmt.Errorf("Invalid (C)")
}
func Reg16(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
switch param {
case "BC":
return 0, nil
case "DE":
return 1, nil
case "HL":
return 2, nil
case "AF":
return 3, nil
// TODO Split in two different for push and not push instructions
case "SP":
return 3, nil
}
return 0, fmt.Errorf("Invalid reg16")
}
func Raw8(
labels *Labels,
lastAbsoluteLabel string,
defs *Definitions,
param string,
) (uint16, error) {
if strings.HasPrefix(param, "high(") && strings.HasSuffix(param, ")") {
v, err := Raw16(labels, lastAbsoluteLabel, defs, param[5:len(param)-1])
if err != nil {
return 0, err
}
return uint16(v >> 8), nil
}
if strings.HasPrefix(param, "low(") && strings.HasSuffix(param, ")") {
v, err := Raw16(labels, lastAbsoluteLabel, defs, param[4:len(param)-1])
if err != nil {
return 0, err
}
return uint16(v & 0xff), nil
}
if strings.HasPrefix(param, "inv(") && strings.HasSuffix(param, ")") {
v, err := Raw8(labels, lastAbsoluteLabel, defs, param[4:len(param)-1])
if err != nil {
return 0, err
}
return uint16((256 / v) & 0xff), nil
}
if strings.HasPrefix(param, "$") {
param = strings.ToUpper(strings.TrimPrefix(param, "$"))
if res, err := strconv.ParseUint(param, 16, 16); err == nil {
if len(param) > 2 {
return 0, fmt.Errorf("%s is > 8bit", param)
}
return uint16(res), nil
}
varWithoutOffset, offset, err := parseOffset(param)
if err != nil {
return 0, err
}
definition, ok := (*defs)[varWithoutOffset]
if !ok {
return 0, fmt.Errorf("$%s is undefined", varWithoutOffset)
}
res, ok := definition.(Raw8b)
if !ok {
return 0, fmt.Errorf(
"$%s is of type %T but Raw8b is expected",
varWithoutOffset,
definition,
)
}
if uint16(res)+offset > 0xff {
return 0, fmt.Errorf(
"overflow: $%s (0x%02x) + 0x%02x exceeds 0xff",
varWithoutOffset,
uint16(res),
offset,
)
}
return uint16(res) + offset, nil
}
if strings.HasPrefix(param, "0x") && len(param) > 4 {
return 0, fmt.Errorf("%s is > 8bit", param)
}
res, err := strconv.ParseUint(param, 0, 8)
return uint16(res), err
}
func Raw16(
labels *Labels,
lastAbsoluteLabel string,
defs *Definitions,
param string,
) (uint16, error) {
if strings.Contains(param, "-") {
spl := strings.Split(param, "-")
v, err := Raw16(labels, lastAbsoluteLabel, defs, spl[0])
if err != nil {
return 0, err
}
result := v
for _, arg := range spl[1:] {
v, err := Raw16(labels, lastAbsoluteLabel, defs, arg)
if err != nil {
return 0, err
}
result -= v
}
return result, nil
}
if strings.HasPrefix(param, "$") {
param = strings.ToUpper(strings.TrimPrefix(param, "$"))
if res, err := strconv.ParseUint(param, 16, 16); err == nil {
return uint16(res), nil
}
varWithoutOffset, offset, err := parseOffset(param)
if err != nil {
return 0, err
}
definition, ok := (*defs)[varWithoutOffset]
if !ok {
return 0, fmt.Errorf("$%s is undefined", varWithoutOffset)
}
res, ok := definition.(Raw16b)
if !ok {
return 0, fmt.Errorf(
"$%s is of type %T but Raw16b is expected",
varWithoutOffset,
definition,
)
}
if uint32(res)+uint32(offset) > 0xffff {
return 0, fmt.Errorf(
"overflow: $%s (0x%04x) + 0x%04x exceeds 0xffff",
varWithoutOffset,
uint16(res),
offset,
)
}
return uint16(res) + offset, nil
}
if strings.HasPrefix(param, "=") {
labelWithoutOffset, offset, err := parseOffset(param[1:])
if err != nil {
return 0, err
}
if labels == nil {
return 0, nil
}
if strings.HasPrefix(labelWithoutOffset, ".") {
if lastAbsoluteLabel == "" {
return 0, fmt.Errorf(
"Relative label \"%s\" referenced outside of parent",
labelWithoutOffset,
)
}
labelWithoutOffset = lastAbsoluteLabel + labelWithoutOffset
}
label := strings.ToUpper(strings.TrimPrefix(labelWithoutOffset, "="))
labelValue, ok := (*labels)[label]
if !ok {
return 0, fmt.Errorf("Label \"%s\" not found", label)
}
// TODO: Manage when multiple MBC
if labelValue > 0x8000 {
panic("Switchable ROM banks are not implemented yet")
}
return uint16(labelValue) + offset, nil
}
res, err := strconv.ParseUint(param, 0, 16)
return uint16(res), err
}
func Raw16MacroRelativeLabel(
labels *Labels,
lastAbsoluteLabel string,
defs *Definitions,
param string,
) (uint16, error) {
if !strings.HasPrefix(param, "=$") {
return 0, fmt.Errorf(
"label \"%s\" is external to the macro",
param,
)
}
return Raw16(labels, lastAbsoluteLabel, defs, param)
}
func Reg16Indirect(
_ *Labels,
lastAbsoluteLabel string,
_ *Definitions,
param string,
) (uint16, error) {
switch param {
case "(BC)":
return 0, nil
case "(DE)":
return 1, nil
case "(HL+)":
return 2, nil
case "(HL-)":
return 3, nil
}
return 0, fmt.Errorf("Invalid reg16 indirect")
}
func Raw8Indirect(
labels *Labels,
lastAbsoluteLabel string,
defs *Definitions,
param string,
) (uint16, error) {
if strings.HasPrefix(param, "$") {
param = strings.ToUpper(strings.TrimPrefix(param, "$"))
definition, ok := (*defs)[param]
if !ok {
return 0, fmt.Errorf("$%s is undefined", param)
}
res, ok := definition.(Indirect8b)
if !ok {
return 0, fmt.Errorf("$%s is of type %T but Indirect8bb is expected", param, definition)
}
return uint16(res), nil
}
if len(param) < 2 || param[0] != '(' || param[len(param)-1] != ')' {
return 0, fmt.Errorf("Invalid raw8indirect")
}
res, err := Raw8(labels, lastAbsoluteLabel, defs, param[1:len(param)-1])
if err == nil {
return res, nil
}
return 0, err
}
func Raw16Indirect(
labels *Labels,
lastAbsoluteLabel string,
defs *Definitions,
param string,
) (uint16, error) {
if strings.HasPrefix(param, "$") {
param = strings.ToUpper(strings.TrimPrefix(param, "$"))
if labels == nil {
return 0, nil
}
definition, ok := (*defs)[param]
if !ok {
return 0, fmt.Errorf("$%s is undefined", param)
}
res, ok := definition.(Indirect16b)
if !ok {
return 0, fmt.Errorf("$%s is of type %T but Indirect16b expected", param, definition)
}
return uint16(res), nil
}
if len(param) < 2 || param[0] != '(' || param[len(param)-1] != ')' {
return 0, fmt.Errorf("Invalid raw16indirect")
}
return Raw16(labels, lastAbsoluteLabel, defs, param[1:len(param)-1])
}
func Condition(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
switch param {
case "NZ":
return 0, nil
case "Z":
return 1, nil
case "NC":
return 2, nil
case "C":
return 3, nil
}
return 0, fmt.Errorf("Invalid condition")
}
func BitOrdinal(_ *Labels, lastAbsoluteLabel string, _ *Definitions, param string) (uint16, error) {
res, err := strconv.ParseUint(param, 0, 3)
return uint16(res), err
}
|
