libgo: update to go1.15rc1

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245157

1 files changed, 4 insertions, 4 deletions

diff --git a/libgo/go/runtime/checkptr.go b/libgo/go/runtime/checkptr.go
index d5f116c..e52f7df 100644
--- a/libgo/go/runtime/checkptr.go
+++ b/libgo/go/runtime/checkptr.go
@@ -14,18 +14,18 @@ func checkptrAlignment(p unsafe.Pointer, elem *_type, n uintptr) {
 	// no pointers themselves. See issue 37298.
 	// TODO(mdempsky): What about fieldAlign?
 	if elem.ptrdata != 0 && uintptr(p)&(uintptr(elem.align)-1) != 0 {
-		throw("checkptr: unsafe pointer conversion")
+		throw("checkptr: misaligned pointer conversion")
 	}
 
 	// Check that (*[n]elem)(p) doesn't straddle multiple heap objects.
 	if size := n * elem.size; size > 1 && checkptrBase(p) != checkptrBase(add(p, size-1)) {
-		throw("checkptr: unsafe pointer conversion")
+		throw("checkptr: converted pointer straddles multiple allocations")
 	}
 }
 
 func checkptrArithmetic(p unsafe.Pointer, originals []unsafe.Pointer) {
 	if 0 < uintptr(p) && uintptr(p) < minLegalPointer {
-		throw("checkptr: unsafe pointer arithmetic")
+		throw("checkptr: pointer arithmetic computed bad pointer value")
 	}
 
 	// Check that if the computed pointer p points into a heap
@@ -42,7 +42,7 @@ func checkptrArithmetic(p unsafe.Pointer, originals []unsafe.Pointer) {
 		}
 	}
 
-	throw("checkptr: unsafe pointer arithmetic")
+	throw("checkptr: pointer arithmetic result points to invalid allocation")
 }
 
 // checkptrBase returns the base address for the allocation containing