ssa: impl builtin alignof offsetof

cl/_testrt/tpunsafe/in.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"unsafe"
+)
+
+type N[T any] struct {
+	n1 T
+	n2 T
+}
+
+type M[T any] struct {
+	m0 T
+	m1 int32
+	m2 N[T]
+}
+
+func (m *M[T]) check(align, offset1, offset2 uintptr) {
+	if v := unsafe.Alignof(m.m2); v != align {
+		println("have", v, "want", align)
+		panic("unsafe.Alignof error")
+	}
+	if v := unsafe.Offsetof(m.m2); v != offset1 {
+		println("have", v, "want", offset1)
+		panic("unsafe.Offsetof error")
+	}
+	if v := unsafe.Offsetof(m.m2.n2); v != offset2 {
+		println("have", v, "want", offset2)
+		panic("unsafe.Offsetof error")
+	}
+}
+
+func main() {
+	m1 := M[bool]{}
+	m1.check(1, 8, 1)
+	m2 := M[int64]{}
+	m2.check(8, 16, 8)
+}