6c6a43310a
A single *ssa.BasicBlock may be split in multiple LLVM basic blocks due to typeassert instructions. This means the incoming block and outgoing block are different. PHI nodes need to get the result from the outgoing block, which was fixed before, but incoming branches need to branch to the incoming block, not the outgoing block. Branching to the outgoing block led to a LLVM verification error when compiling the fmt package. Originally found in (*fmt.pp).handleMethods.
129 строки
2,1 КиБ
Go
129 строки
2,1 КиБ
Go
package main
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func main() {
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thing := &Thing{"foo"}
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println("thing:", thing.String())
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thing.Print()
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printItf(5)
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printItf(byte('x'))
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printItf("foo")
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printItf(Foo(18))
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printItf(*thing)
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printItf(thing)
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printItf(Stringer(thing))
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printItf(Number(3))
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array := Array([4]uint32{1, 7, 11, 13})
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printItf(array)
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printItf(ArrayStruct{3, array})
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printItf(SmallPair{3, 5})
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s := Stringer(thing)
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println("Stringer.String():", s.String())
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var itf interface{} = s
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println("Stringer.(*Thing).String():", itf.(Stringer).String())
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println("nested switch:", nestedSwitch('v', 3))
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}
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func printItf(val interface{}) {
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switch val := val.(type) {
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case Doubler:
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println("is Doubler:", val.Double())
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case Tuple:
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println("is Tuple:", val.Nth(0), val.Nth(1), val.Nth(2), val.Nth(3))
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val.Print()
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case int:
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println("is int:", val)
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case byte:
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println("is byte:", val)
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case string:
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println("is string:", val)
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case Thing:
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println("is Thing:", val.String())
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case *Thing:
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println("is *Thing:", val.String())
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case Foo:
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println("is Foo:", val)
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default:
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println("is ?")
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}
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}
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func nestedSwitch(verb rune, arg interface{}) bool {
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switch verb {
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case 'v', 's':
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switch arg.(type) {
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case int:
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return true
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}
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}
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return false
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}
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type Thing struct {
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name string
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}
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func (t Thing) String() string {
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return t.name
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}
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func (t Thing) Print() {
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println("Thing.Print:", t.name)
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}
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type Stringer interface {
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String() string
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}
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type Foo int
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type Number int
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func (n Number) Double() int {
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return int(n) * 2
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}
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type Doubler interface {
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Double() int
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}
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type Tuple interface {
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Nth(int) uint32
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Print()
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}
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type Array [4]uint32
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func (a Array) Nth(n int) uint32 {
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return a[n]
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}
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func (a Array) Print() {
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println("Array len:", len(a))
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}
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type ArrayStruct struct {
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n int
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a Array
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}
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func (a ArrayStruct) Nth(n int) uint32 {
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return a.a[n]
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}
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func (a ArrayStruct) Print() {
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println("ArrayStruct.Print:", len(a.a), a.n)
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}
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type SmallPair struct {
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a byte
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b byte
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}
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func (p SmallPair) Nth(n int) uint32 {
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return uint32(int(p.a)*n + int(p.b)*n)
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}
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func (p SmallPair) Print() {
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println("SmallPair.Print:", p.a, p.b)
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}
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