diff options
Diffstat (limited to 'vendor/github.com/modern-go/reflect2/unsafe_link.go')
-rw-r--r-- | vendor/github.com/modern-go/reflect2/unsafe_link.go | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/vendor/github.com/modern-go/reflect2/unsafe_link.go b/vendor/github.com/modern-go/reflect2/unsafe_link.go new file mode 100644 index 000000000..57229c8db --- /dev/null +++ b/vendor/github.com/modern-go/reflect2/unsafe_link.go @@ -0,0 +1,70 @@ +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") +} |