Source file src/runtime/msize.go

Documentation: runtime

		 1  // Copyright 2009 The Go Authors. All rights reserved.
		 2  // Use of this source code is governed by a BSD-style
		 3  // license that can be found in the LICENSE file.
		 4  
		 5  // Malloc small size classes.
		 6  //
		 7  // See malloc.go for overview.
		 8  // See also mksizeclasses.go for how we decide what size classes to use.
		 9  
		10  package runtime
		11  
		12  // Returns size of the memory block that mallocgc will allocate if you ask for the size.
		13  func roundupsize(size uintptr) uintptr {
		14  	if size < _MaxSmallSize {
		15  		if size <= smallSizeMax-8 {
		16  			return uintptr(class_to_size[size_to_class8[divRoundUp(size, smallSizeDiv)]])
		17  		} else {
		18  			return uintptr(class_to_size[size_to_class128[divRoundUp(size-smallSizeMax, largeSizeDiv)]])
		19  		}
		20  	}
		21  	if size+_PageSize < size {
		22  		return size
		23  	}
		24  	return alignUp(size, _PageSize)
		25  }
		26  

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