1 files changed, 25 insertions, 0 deletions
diff --git a/src/runtime/msize.go b/src/runtime/msize.go
new file mode 100644
index 0000000..c56aa5a
--- /dev/null
+++ b/src/runtime/msize.go
@@ -0,0 +1,25 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Malloc small size classes.
+//
+// See malloc.go for overview.
+// See also mksizeclasses.go for how we decide what size classes to use.
+
+package runtime
+
+// Returns size of the memory block that mallocgc will allocate if you ask for the size.
+func roundupsize(size uintptr) uintptr {
+	if size < _MaxSmallSize {
+		if size <= smallSizeMax-8 {
+			return uintptr(class_to_size[size_to_class8[divRoundUp(size, smallSizeDiv)]])
+		} else {
+			return uintptr(class_to_size[size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)]])
+		}
+	}
+	if size+_PageSize < size {
+		return size
+	}
+	return alignUp(size, _PageSize)
+}