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// 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. //go:build goexperiment.allocheaders // 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, // minus any inline space for metadata. func roundupsize(size uintptr, noscan bool) (reqSize uintptr) { reqSize = size if reqSize <= maxSmallSize-mallocHeaderSize { // Small object. if !noscan && reqSize > minSizeForMallocHeader { // !noscan && !heapBitsInSpan(reqSize) reqSize += mallocHeaderSize } // (reqSize - size) is either mallocHeaderSize or 0. We need to subtract mallocHeaderSize // from the result if we have one, since mallocgc will add it back in. if reqSize <= smallSizeMax-8 { return uintptr(class_to_size[size_to_class8[divRoundUp(reqSize, smallSizeDiv)]]) - (reqSize - size) } return uintptr(class_to_size[size_to_class128[divRoundUp(reqSize-smallSizeMax, largeSizeDiv)]]) - (reqSize - size) } // Large object. Align reqSize up to the next page. Check for overflow. reqSize += pageSize - 1 if reqSize < size { return size } return reqSize &^ (pageSize - 1) }
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