func sysVClassifyType(typ types.Type) []sysVParameterClass {
switch typ := typ.(type) {
case *types.Struct:
return sysVClassifyStructType(typ)
case *types.Array:
return sysVClassifyArrayType(typ)
case *types.Int:
switch typ.Width() {
case 1, 8, 16, 32, 64, 128:
return []sysVParameterClass{sysVClassINTEGER}
default:
panic("unim")
}
case *types.Pointer:
return []sysVParameterClass{sysVClassINTEGER}
case *types.Float:
switch typ.Type() {
case types.Float32, types.Float64:
return []sysVParameterClass{sysVClassSSE}
default:
panic("unim")
}
case types.Void:
return []sysVParameterClass{sysVClassNO_CLASS}
default:
panic("amd64.classifyType: unim: " + reflect.TypeOf(typ).String())
}
}
func errIfNotPointerType(i ssa.Instruction, t types.Type) error {
_, ok := t.(*types.Pointer)
if !ok {
return &InstrError{
Instr: i,
Message: "Expected pointer type, found `" + t.String() + "`",
}
}
return nil
}
func errIfNotFloatType(i ssa.Instruction, t types.Type) error {
_, ok := t.(*types.Float)
if !ok {
return &InstrError{
Instr: i,
Message: "Expected float type, found `" + t.String() + "`",
}
}
return nil
}
func errIfMismatchedTypes(t1, t2 types.Type, i ssa.Instruction) error {
if !t1.Equals(t2) {
return &InstrError{
Message: fmt.Sprintf("Mismatched types `%s` and `%s`", t1, t2),
Instr: i,
}
}
return nil
}
func TypeSizeInBits(typ types.Type) int {
switch typ := typ.(type) {
case *types.Int:
w := typ.Width()
for w%8 != 0 {
w++
}
return w
case *types.Float:
return typ.Type().Width()
case *types.Pointer:
return 64
case *types.Array:
return TypeSizeInBits(typ.Element()) * typ.Length()
case *types.Struct:
return newStructLayout(typ).size
default:
panic("unim")
}
}
// will always be multiple of 8
func TypeAlignmentInBits(typ types.Type) int {
switch typ := typ.(type) {
case *types.Struct:
return newStructLayout(typ).alignment
case *types.Array:
return TypeAlignmentInBits(typ.Element())
}
sz := TypeSizeInBits(typ)
i := 8
for i < sz {
i *= 2
}
return i
}
func checkMismatchedTypesGlobal(t1, t2 types.Type, g *ssa.Global) error {
if !t1.Equals(t2) {
return &GlobalError{
Global: g,
Message: "Mismatched types: `" + t1.String() + "` and `" + t2.String() + "`",
}
}
return nil
}
func checkTypeSupported(typ types.Type) {
switch typ := typ.(type) {
case *types.Int:
switch typ.Width() {
case 1, 8, 16, 32, 64:
// all good
default:
goto unsupported
}
case *types.Array:
checkTypeSupported(typ.Element())
case *types.Struct:
for _, field := range typ.Fields() {
checkTypeSupported(field)
}
}
return
unsupported:
panic(fmt.Sprintf("unsupported type: %s", typ))
}