func gcallers(gp *g, skip int, pcbuf []uintptr) int {
	var u unwinder
	u.init(gp, unwindSilentErrors)
	return tracebackPCs(&u, skip, pcbuf)
}

// showframe reports whether the frame with the given characteristics should
// be printed during a traceback.
func showframe(sf srcFunc, gp *g, firstFrame bool, calleeID abi.FuncID) bool {
	mp := getg().m

// ShowFrom(C) returns true and has frames [C, B].
// ShowFrom(D) returns false and drops the sample because no frames remain.
func (p *Profile) ShowFrom(showFrom *regexp.Regexp) (matched bool) {
	if showFrom == nil {
		return false
	}
	// showFromLocs stores location IDs that matched ShowFrom.
	showFromLocs := make(map[uint64]bool)
	// Apply to locations.
	for _, loc := range p.Location {

	warnNoMatches(ignore == nil || im, "Ignore", ui)
	warnNoMatches(hide == nil || hm, "Hide", ui)
	warnNoMatches(show == nil || hnm, "Show", ui)

	sfm := prof.ShowFrom(showfrom)
	warnNoMatches(showfrom == nil || sfm, "ShowFrom", ui)

	tfm, tim := prof.FilterSamplesByTag(tagfocus, tagignore)
	warnNoMatches(tagfocus == nil || tfm, "TagFocus", ui)
	warnNoMatches(tagignore == nil || tim, "TagIgnore", ui)

    <a title="{{.Help.ignore}}" id="action-ignore" href="?">Ignore</a>
    <a title="{{.Help.hide}}" id="action-hide" href="?">Hide</a>
    <a title="{{.Help.show_from}}" id="action-showfrom" href="?">Show from</a>
  </div>
  {{template "script" .}}
  {{template "stacks_js"}}
  <script>
    pprofUnitDefs = {{.UnitDefs}};
    stackViewer({{.Stacks}}, {{.Nodes}});
  </script>
</body>

			filters = append(filters, k+"="+v)
		}
	}
	addFilter("focus", cfg.Focus)
	addFilter("ignore", cfg.Ignore)
	addFilter("hide", cfg.Hide)
	addFilter("show", cfg.Show)
	addFilter("show_from", cfg.ShowFrom)
	addFilter("tagfocus", cfg.TagFocus)
	addFilter("tagignore", cfg.TagIgnore)
	addFilter("tagshow", cfg.TagShow)
	addFilter("taghide", cfg.TagHide)

	ropt := &report.Options{
		CumSort:      cfg.Sort == "cum",

	Ignore       string  `json:"ignore,omitempty"`
	PruneFrom    string  `json:"prune_from,omitempty"`
	Hide         string  `json:"hide,omitempty"`
	Show         string  `json:"show,omitempty"`
	ShowFrom     string  `json:"show_from,omitempty"`
	TagFocus     string  `json:"tagfocus,omitempty"`
	TagIgnore    string  `json:"tagignore,omitempty"`
	TagShow      string  `json:"tagshow,omitempty"`

    setHrefParam('action-source-tab', 'f', box.src);
    setHrefParam('action-focus', 'f', box.src);
    setHrefParam('action-ignore', 'i', box.src);
    setHrefParam('action-hide', 'h', box.src);
    setHrefParam('action-showfrom', 'sf', box.src);
    toggleClass(box.src, 'hilite2', true);
    actionTarget = box;
    actionMenuOn = true;
  }

  function hideActionMenu() {
    actions.style.display = 'none';