span = c.allocLarge(size, noscan)
		span.freeindex = 1
		span.allocCount = 1
		size = span.elemsize
		x = unsafe.Pointer(span.base())
		if needzero && span.needzero != 0 {
			delayedZeroing = true
		}
		if !noscan {
			// Tell the GC not to look at this yet.
			span.largeType = nil
			header = &span.largeType
		}
	}
	if !noscan && !delayedZeroing {

		}
	}
	h.allspans = h.allspans[:len(h.allspans)+1]
	h.allspans[len(h.allspans)-1] = s
}

// A spanClass represents the size class and noscan-ness of a span.
//
// Each size class has a noscan spanClass and a scan spanClass. The
// noscan spanClass contains only noscan objects, which do not contain
// pointers and thus do not need to be scanned by the garbage
// collector.
type spanClass uint8

const (

	s := spanOfUnchecked(b)
	n := s.elemsize
	if n == 0 {
		throw("scanobject n == 0")
	}
	if s.spanclass.noscan() {
		// Correctness-wise this is ok, but it's inefficient
		// if noscan objects reach here.
		throw("scanobject of a noscan object")
	}

	var tp typePointers
	if n > maxObletBytes {
		// Large object. Break into oblets for better
		// parallelism and lower latency.

//
//go:nosplit
func (span *mspan) heapBits() []uintptr {
	const doubleCheck = false

	if doubleCheck && !span.isUserArenaChunk {
		if span.spanclass.noscan() {
			throw("heapBits called for noscan")
		}
		if span.elemsize > minSizeForMallocHeader {
			throw("heapBits called for span class that should have a malloc header")
		}
	}
	// Find the bitmap at the end of the span.
	//

	// Restore 64-bit alignment on 32-bit.
	_ uint32

	// bytesMarked is the number of bytes marked this cycle. This
	// includes bytes blackened in scanned objects, noscan objects
	// that go straight to black, and permagrey objects scanned by
	// markroot during the concurrent scan phase. This is updated
	// atomically during the cycle. Updates may be batched
	// arbitrarily, since the value is only read at the end of the
	// cycle.
	//

teamcity-scan.png...

# )
#
# copybara_config_test(
#     name = "copybara_config_test",
#     config = "copy.bara.sky",
#     tags = [
#         "noasan",
#         "nodfsan",
#         "nogotsan",
#         "nogpu",
#         "nomsan",
#         "nosan",
#         "notsan",
#         "noubsan",
#     ],
#     deps = [":copybara_config"],
# )
#
# action_config_test(
#     name = "build_cleaner_spec_test",

	_Gcopystack: "copystack",
	_Gpreempted: "preempted",
}

func goroutineheader(gp *g) {
	level, _, _ := gotraceback()

	gpstatus := readgstatus(gp)

	isScan := gpstatus&_Gscan != 0
	gpstatus &^= _Gscan // drop the scan bit

	// Basic string status
	var status string
	if 0 <= gpstatus && gpstatus < uint32(len(gStatusStrings)) {
		status = gStatusStrings[gpstatus]
	} else {

build-scan-home.png...

build-scan-infrastructure.png...