// update heapScanWork. TODO: is there a better metric,
		// now that we can skip scalar portions pretty efficiently?
		scanSize = addr - b + goarch.PtrSize

		// Work here is duplicated in scanblock and above.
		// If you make changes here, make changes there too.
		obj := *(*uintptr)(unsafe.Pointer(addr))

		// At this point we have extracted the next potential pointer.

		t.SetHasShape(true)
	}
	if sym.Pkg.Path == "runtime/internal/sys" && sym.Name == "nih" {
		// Recognize the special not-in-heap type. Any type including
		// this type will also be not-in-heap.
		// This logic is duplicated in go/types and
		// cmd/compile/internal/types2.
		t.SetNotInHeap(true)
	}
	return t
}

// Obj returns the canonical type name node for a named type t, nil for an unnamed type.

	MOVL   $64, R11
	JMP     gcWriteBarrier<>(SB)

DATA	debugCallFrameTooLarge<>+0x00(SB)/20, $"call frame too large"
GLOBL	debugCallFrameTooLarge<>(SB), RODATA, $20	// Size duplicated below

// debugCallV2 is the entry point for debugger-injected function
// calls on running goroutines. It informs the runtime that a
// debug call has been injected and creates a call frame for the

		wantSamples: []*profile.Sample{
			{Value: []int64{70, 70 * period}, Location: []*profile.Location{{ID: 1}}},
		},
	}, {
		// The same location is used for duplicated stacks.
		name: "truncated_stack_trace_twice",
		input: []uint64{
			3, 0, 500, // hz = 500. Must match the period.
			4, 0, 70, inlinedCallerStack[0],
			// Fake frame: add a fake call to

			// See https://sourceware.org/bugzilla/show_bug.cgi?id=19011
			section := f.Section(".edata")
			if section == nil {
				t.Skip(".edata section is not present")
			}
			// TODO: deduplicate this struct from cmd/link/internal/ld/pe.go
			type IMAGE_EXPORT_DIRECTORY struct {
				_                 [2]uint32
				_                 [2]uint16
				_                 [2]uint32
				NumberOfFunctions uint32

	//
	// A previous version of this code said:
	//
	//	c.duration = ...
	//	c.signal <- c.self
	//	runtime.Goexit()
	//
	// This previous version duplicated code (those lines are in
	// tRunner no matter what), but worse the goroutine teardown
	// implicit in runtime.Goexit was not guaranteed to complete
	// before the test exited. If a test deferred an important cleanup