// walkFrames calls visit for each call frame represented by pcs.
//
// pcs should be a slice of PCs, as returned by runtime.Callers.
func walkFrames(pcs []uintptr, visit frameVisitor) {
	if len(pcs) == 0 {
		return
	}

	frames := runtime.CallersFrames(pcs)
	for {
		frame, more := frames.Next()
		visit(frame.File, frame.Line, frame.Function, frame.PC-frame.Entry)
		if !more {
			return
		}
	}
}

}

//go:noinline
func testCaller(skp int) frame {
	skip = skp
	f() // line 42
	frame := globalFrame
	if !frame.ok {
		panic(fmt.Sprintf("skip=%d runtime.Caller failed", skp))
	}
	return frame
}

type wantFrame struct {
	funcName string
	line     int
}

// -1 means don't care
var expected = []wantFrame{
	0: {"main.h", 36},
	1: {"main.g", 31},
	2: {"main.f", 27},

	// the stack frame but we're not going back there
	// anyway.
	sp := c.sp() - sys.StackAlign // needs only sizeof uint64, but must align the stack
	c.set_sp(sp)
	*(*uint64)(unsafe.Pointer(uintptr(sp))) = c.lr()
	// Make sure a valid frame pointer is saved on the stack so that the
	// frame pointer checks in adjustframe are happy, if they're enabled.
	// Frame pointer unwinding won't visit the sigpanic frame, since

	wg.Done()
	ci := runtime.CallersFrames(wg.Callers)
	frames := make([]runtime.Frame, 0, 4)
	for {
		frame, more := ci.Next()
		frames = append(frames, frame)
		if !more {
			break
		}
	}
	expecting := []string{
		"test/mysync.(*WaitGroup).Add",
		"test/mysync.(*WaitGroup).Done",
	}
	for i := 0; i < 2; i++ {
		if frames[i].Function != expecting[i] {
			log.Fatalf("frame %d: got %s, want %s", i, frames[i].Function, expecting[i])

			// Return now to avoid processing the zero Frame that would
			// otherwise be returned by frames.Next below.
			return
		}

		pc = pc[:n] // pass only valid pcs to runtime.CallersFrames
		frames := runtime.CallersFrames(pc)

		// Loop to get frames.
		// A fixed number of PCs can expand to an indefinite number of Frames.
		for {
			frame, more := frames.Next()

			// Process this frame.
			//

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package p

func f3(x *[1 << 31]byte) byte { // GC_ERROR "stack frame too large"
	for _, b := range *x {
		return b
	}
	return 0
}
func f4(x *[1 << 32]byte) byte { // GC_ERROR "stack frame too large"
	for _, b := range *x {
		return b
	}
	return 0
}
func f5(x *[1 << 33]byte) byte { // GC_ERROR "stack frame too large"
	for _, b := range *x {
		return b
	}
	return 0

		return nil, err
	}

	var stack []plugin.Frame
	for {
		frame, end := d.readFrame()
		if end {
			break
		}

		if frame != (plugin.Frame{}) {
			stack = append(stack, frame)
		}
	}

	return stack, nil

          print "Hit breakpoint"
          frame = t.GetFrameAtIndex(0)
          if frame:
            if frame.line_entry:
              print "Stopped at %s:%d" % (frame.line_entry.file.basename, frame.line_entry.line)
            if frame.function:
              print "Stopped in %s" % (frame.function.name,)
            var = frame.FindVariable('intvar')
            if var: