Method AllocationSize

pkg/callstack/callstack.go:82–127

AllocationSize calculates the private region size to which the frame return address pertains if the memory pages within the region are private and non-shareable pages.

(proc windows.Handle)

// memory pages within the region are private and
// non-shareable pages.
func (f *Frame) AllocationSize(proc windows.Handle) uint64 {
	if f.Addr.InSystemRange() {
		return 0
	}

	r := va.VirtualQuery(proc, f.Addr.Uint64())

	if r == nil || (r.State != windows.MEM_COMMIT || r.Protect == windows.PAGE_NOACCESS || r.Type != va.MemImage) {
		return 0
	}

	pageCount := r.Size / pageSize
	m := make([]sys.MemoryWorkingSetExInformation, pageCount)
	for n := range pageCount {
		addr := f.Addr.Inc(n * pageSize)
		m[n].VirtualAddress = addr.Uintptr()
	}

	ws := va.QueryWorkingSet(proc, m)
	if ws == nil {
		return 0
	}

	var size uint64

	// traverse all pages in the region
	for _, r := range ws {
		attr := r.VirtualAttributes
		if !attr.Valid() {
			continue
		}

		// use SharedOriginal after RS3/1709
		if buildNumber >= 16299 {
			if !attr.SharedOriginal() {
				size += pageSize
			}
		} else {
			if !attr.Shared() {
				size += pageSize
			}
		}
	}

	return size
}

// Protection resolves the memory protection
// of the pages within the region that contains the