/
layout.go
150 lines (130 loc) · 3.33 KB
/
layout.go
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package wap
func (union *Union) DoLayout() {
}
func (record *Record) DoLayout() {
compact := false
if record.Layout() == RecordLayoutCompact {
record.SetAlign(1)
compact = true
} else {
record.SetAlign(0)
}
record.SetOffset(0)
record.SetOptionals(0)
record.SetFixed(true)
fields := record.Fields()
for i := 0; i < len(fields); i++ {
field := &fields[i]
kind := field.Kind().Kind()
if field.Kind().Enum() != nil {
kind = field.Kind().Enum().Kind()
}
field.SetAlign(0)
switch kind {
case KindUnknown:
case KindBool, KindByte, KindInt8:
field.Kind().SetSize(1)
field.Kind().SetAlign(1)
field.SetPointer(false)
case KindInt16, KindUInt16:
field.Kind().SetSize(2)
field.Kind().SetAlign(2)
field.SetPointer(false)
case KindInt32, KindUInt32, KindFloat32:
field.Kind().SetSize(4)
field.Kind().SetAlign(4)
field.SetPointer(false)
case KindInt64, KindUInt64, KindFloat64:
field.Kind().SetSize(8)
field.Kind().SetAlign(8)
field.SetPointer(false)
case KindEnum:
// Ignore since the kind is unwrapped
case KindStruct, KindRecord:
r := field.Kind().Record()
if r != nil {
field.Kind().SetAlign(r.Align())
if !r.Fixed() {
record.SetFixed(false)
field.Kind().SetAlign(VPointerSize)
field.Kind().SetSize(VPointerSize)
field.SetPointer(true)
} else {
field.Kind().SetAlign(r.Align())
field.Kind().SetSize(r.Size())
field.SetPointer(false)
}
}
case KindStringInline, KindBytesInline:
field.Kind().SetAlign(1)
field.SetPointer(false)
case KindString, KindBytes:
record.SetFixed(false)
field.Kind().SetAlign(VPointerSize)
field.Kind().SetSize(VPointerSize)
field.SetPointer(true)
case KindList:
record.SetFixed(false)
field.Kind().SetAlign(VPointerSize)
field.Kind().SetSize(VPointerSize)
field.SetPointer(true)
case KindMap:
record.SetFixed(false)
field.Kind().SetAlign(VPointerSize)
field.Kind().SetSize(VPointerSize)
field.SetPointer(true)
case KindUnion:
// TODO: Does union have any pointers?
field.Kind().SetAlign(field.Kind().Union().Align())
field.Kind().SetSize(field.Kind().Union().Size())
field.SetPointer(false)
case KindPad:
}
if field.Optional() && !field.Pointer() {
record.SetOptionals(record.Optionals() + 1)
}
if compact {
field.SetAlign(1)
} else {
field.SetAlign(field.Kind().Align())
if field.Align() > record.Align() {
record.SetAlign(field.Align())
}
}
}
if record.Optionals() > 0 {
record.SetOptionalOffset(record.Offset())
record.SetOptionalSize(record.Optionals() / 8)
if record.Optionals()%8 == 0 {
record.SetOptionalSize(record.OptionalSize() + 1)
}
record.SetOffset(record.OptionalOffset())
} else {
record.SetOptionalOffset(0)
record.SetOptionalSize(0)
}
if record.Align() == 0 {
record.SetAlign(1)
}
if record.Offset() > 0 {
record.SetOffset(align(record.Offset(), record.Align()))
}
offset := record.Offset()
for i := 0; i < len(fields); i++ {
field := &fields[i]
offset = align(offset, field.Align())
field.SetOffset(offset)
offset += field.Kind().Size()
}
record.SetSize(align(offset, record.Align()))
}
func align(offset, align int32) int32 {
if offset == 0 || align == 0 {
return 0
}
extras := offset % align
if extras == 0 {
return offset
}
return ((offset / align) + 1) * align
}