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Source file src/runtime/msize.go

Documentation: runtime

  // 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[(size+smallSizeDiv-1)/smallSizeDiv]])
  		} else {
  			return uintptr(class_to_size[size_to_class128[(size-smallSizeMax+largeSizeDiv-1)/largeSizeDiv]])
  	if size+_PageSize < size {
  		return size
  	return round(size, _PageSize)

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