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package code
import (
"encoding/binary"
"jinx/pkg/libs/source"
"math"
)
type Builder struct {
code []byte
debugInfo DebugInfo
markers map[Marker]int
markerRefs map[int]Marker
currentLine int
lineStart int
}
func NewBuilder() Builder {
return Builder{
code: make([]byte, 0, 64),
debugInfo: NewDebugInfo("unknown file"),
markers: make(map[Marker]int, 0),
markerRefs: make(map[int]Marker, 0),
lineStart: -1,
currentLine: -1,
}
}
func (b *Builder) AppendOp(op Op) {
b.code = append(b.code, byte(op))
}
func (b *Builder) AppendInt(x int64) {
b.code = append(b.code, make([]byte, 8)...)
binary.LittleEndian.PutUint64(b.code[len(b.code)-8:], uint64(x))
}
func (b *Builder) AppendFloat(x float64) {
b.AppendInt(int64(math.Float64bits(x)))
}
func (b *Builder) AppendString(s string) {
b.code = append(b.code, []byte(s)...)
b.code = append(b.code, 0)
}
const UnfilledMarkerReference = 0x11_5AB07A6ED_600D5
func (b *Builder) AppendMarkerReference(marker Marker) {
b.markerRefs[b.Len()] = marker
b.AppendInt(UnfilledMarkerReference)
}
func (b *Builder) AppendRaw(raw Raw) {
b.code = append(b.code, raw...)
}
func (b *Builder) AppendBuilder(other Builder) error {
for marker, pc := range other.markers {
if parentPc, ok := b.markers[marker]; ok {
return ErrBuilderAppendMarkerDefinitionClash{
Marker: marker,
ParentPc: parentPc,
ChildPc: pc,
}
}
b.SetMarker(marker, b.Len()+pc)
}
for pc, marker := range other.markerRefs {
b.markerRefs[b.Len()+pc] = marker
}
b.AppendRaw(other.code)
b.debugInfo.AppendOther(other.debugInfo)
return nil
}
func (b *Builder) PutMarker(marker Marker) {
b.SetMarker(marker, b.Len())
}
func (b *Builder) SetMarker(marker Marker, pc int) {
b.markers[marker] = pc
}
func (b *Builder) StartLine(line int) {
if b.lineStart != -1 {
panic("line already started")
}
b.currentLine = line
b.lineStart = b.Len()
}
func (b *Builder) EndLine() {
defer func() {
b.currentLine = -1
b.lineStart = -1
}()
if b.lineStart == -1 {
panic("line not started")
}
if b.lineStart == b.Len() {
return
}
b.debugInfo.AppendLine(b.Len()-1, b.currentLine)
}
func (b *Builder) AddDebugInfo(fromPc, toPc int, loc source.Loc) {
b.debugInfo.FillInfo(fromPc, toPc, loc)
}
func (b *Builder) SetInt(at int, x int64) {
binary.LittleEndian.PutUint64(b.code[at:], uint64(x))
}
func (b *Builder) Code() Raw {
return Raw(b.code)
}
func (b *Builder) Len() int {
return len(b.code)
}
func (b *Builder) Build() (Code, error) {
for pc, marker := range b.markerRefs {
markerPc, ok := b.markers[marker]
if !ok {
return Code{}, ErrBuilderUnfulfilledMarker{
Marker: marker,
Pc: pc,
}
}
valueAtRefPc := binary.LittleEndian.Uint64(b.code[pc : pc+8])
if valueAtRefPc != UnfilledMarkerReference {
return Code{}, ErrBuilderOverwrittenMarkerReference{
Marker: marker,
Pc: pc,
UnexpectedValue: valueAtRefPc,
}
}
b.SetInt(pc, int64(markerPc))
}
return New(b.code, b.debugInfo), nil
}
|
