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