diff options
Diffstat (limited to 'libgo/go/runtime/export_test.go')
| -rw-r--r-- | libgo/go/runtime/export_test.go | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/libgo/go/runtime/export_test.go b/libgo/go/runtime/export_test.go index b60c19b..6595faf 100644 --- a/libgo/go/runtime/export_test.go +++ b/libgo/go/runtime/export_test.go @@ -945,4 +945,29 @@ func SemNwait(addr *uint32) uint32 { return atomic.Load(&root.nwait) } +// MapHashCheck computes the hash of the key k for the map m, twice. +// Method 1 uses the built-in hasher for the map. +// Method 2 uses the typehash function (the one used by reflect). +// Returns the two hash values, which should always be equal. +func MapHashCheck(m interface{}, k interface{}) (uintptr, uintptr) { + // Unpack m. + mt := (*maptype)(unsafe.Pointer(efaceOf(&m)._type)) + mh := (*hmap)(efaceOf(&m).data) + + // Unpack k. + kt := efaceOf(&k)._type + var p unsafe.Pointer + if isDirectIface(kt) { + q := efaceOf(&k).data + p = unsafe.Pointer(&q) + } else { + p = efaceOf(&k).data + } + + // Compute the hash functions. + x := mt.hasher(noescape(p), uintptr(mh.hash0)) + y := typehash(kt, noescape(p), uintptr(mh.hash0)) + return x, y +} + var Pusestackmaps = &usestackmaps |