mirror of https://github.com/hashicorp/consul
71 lines
2.7 KiB
Go
71 lines
2.7 KiB
Go
|
package reflect2
|
||
|
|
|
||
|
|
import "unsafe"
|
||
|
|
|
||
|
|
//go:linkname unsafe_New reflect.unsafe_New
|
||
|
|
func unsafe_New(rtype unsafe.Pointer) unsafe.Pointer
|
||
|
|
|
||
|
|
//go:linkname typedmemmove reflect.typedmemmove
|
||
|
|
func typedmemmove(rtype unsafe.Pointer, dst, src unsafe.Pointer)
|
||
|
|
|
||
|
|
//go:linkname unsafe_NewArray reflect.unsafe_NewArray
|
||
|
|
func unsafe_NewArray(rtype unsafe.Pointer, length int) unsafe.Pointer
|
||
|
|
|
||
|
|
// typedslicecopy copies a slice of elemType values from src to dst,
|
||
|
|
// returning the number of elements copied.
|
||
|
|
//go:linkname typedslicecopy reflect.typedslicecopy
|
||
|
|
//go:noescape
|
||
|
|
func typedslicecopy(elemType unsafe.Pointer, dst, src sliceHeader) int
|
||
|
|
|
||
|
|
//go:linkname mapassign reflect.mapassign
|
||
|
|
//go:noescape
|
||
|
|
func mapassign(rtype unsafe.Pointer, m unsafe.Pointer, key, val unsafe.Pointer)
|
||
|
|
|
||
|
|
//go:linkname mapaccess reflect.mapaccess
|
||
|
|
//go:noescape
|
||
|
|
func mapaccess(rtype unsafe.Pointer, m unsafe.Pointer, key unsafe.Pointer) (val unsafe.Pointer)
|
||
|
|
|
||
|
|
// m escapes into the return value, but the caller of mapiterinit
|
||
|
|
// doesn't let the return value escape.
|
||
|
|
//go:noescape
|
||
|
|
//go:linkname mapiterinit reflect.mapiterinit
|
||
|
|
func mapiterinit(rtype unsafe.Pointer, m unsafe.Pointer) *hiter
|
||
|
|
|
||
|
|
//go:noescape
|
||
|
|
//go:linkname mapiternext reflect.mapiternext
|
||
|
|
func mapiternext(it *hiter)
|
||
|
|
|
||
|
|
//go:linkname ifaceE2I reflect.ifaceE2I
|
||
|
|
func ifaceE2I(rtype unsafe.Pointer, src interface{}, dst unsafe.Pointer)
|
||
|
|
|
||
|
|
// A hash iteration structure.
|
||
|
|
// If you modify hiter, also change cmd/internal/gc/reflect.go to indicate
|
||
|
|
// the layout of this structure.
|
||
|
|
type hiter struct {
|
||
|
|
key unsafe.Pointer // Must be in first position. Write nil to indicate iteration end (see cmd/internal/gc/range.go).
|
||
|
|
value unsafe.Pointer // Must be in second position (see cmd/internal/gc/range.go).
|
||
|
|
// rest fields are ignored
|
||
|
|
}
|
||
|
|
|
||
|
|
// add returns p+x.
|
||
|
|
//
|
||
|
|
// The whySafe string is ignored, so that the function still inlines
|
||
|
|
// as efficiently as p+x, but all call sites should use the string to
|
||
|
|
// record why the addition is safe, which is to say why the addition
|
||
|
|
// does not cause x to advance to the very end of p's allocation
|
||
|
|
// and therefore point incorrectly at the next block in memory.
|
||
|
|
func add(p unsafe.Pointer, x uintptr, whySafe string) unsafe.Pointer {
|
||
|
|
return unsafe.Pointer(uintptr(p) + x)
|
||
|
|
}
|
||
|
|
|
||
|
|
// arrayAt returns the i-th element of p,
|
||
|
|
// an array whose elements are eltSize bytes wide.
|
||
|
|
// The array pointed at by p must have at least i+1 elements:
|
||
|
|
// it is invalid (but impossible to check here) to pass i >= len,
|
||
|
|
// because then the result will point outside the array.
|
||
|
|
// whySafe must explain why i < len. (Passing "i < len" is fine;
|
||
|
|
// the benefit is to surface this assumption at the call site.)
|
||
|
|
func arrayAt(p unsafe.Pointer, i int, eltSize uintptr, whySafe string) unsafe.Pointer {
|
||
|
|
return add(p, uintptr(i)*eltSize, "i < len")
|
||
|
|
}
|