Golang CallInstruction.Parent方法代码示例

// addCallees adds client data and links for the facts that site calls fns.
func (a *analysis) addCallees(site ssa.CallInstruction, fns []*ssa.Function) {
	v := calleesJSON{
		Descr:   site.Common().Description(),
		Callees: []anchorJSON{}, // (JS wants non-nil)
	}
	var this *types.Package // for relativizing names
	if p := site.Parent().Package(); p != nil {
		this = p.Object
	}

	for _, fn := range fns {
		v.Callees = append(v.Callees, anchorJSON{
			Text: prettyFunc(this, fn),
			Href: a.posURL(funcToken(fn), len("func")),
		})
	}

	fi, offset := a.fileAndOffset(site.Common().Pos())
	fi.addLink(aLink{
		start:   offset,
		end:     offset + len("("),
		title:   fmt.Sprintf("%d callees", len(v.Callees)),
		onclick: fmt.Sprintf("onClickCallees(%d)", fi.addData(v)),
	})
}

// addEdge adds the specified call graph edge, and marks it reachable.
// addrTaken indicates whether to mark the callee as "address-taken".
func (r *rta) addEdge(site ssa.CallInstruction, callee *ssa.Function, addrTaken bool) {
	r.addReachable(callee, addrTaken)

	if g := r.result.CallGraph; g != nil {
		if site.Parent() == nil {
			panic(site)
		}
		from := g.CreateNode(site.Parent())
		to := g.CreateNode(callee)
		callgraph.AddEdge(from, site, to)
	}
}

func findCallees(o *Oracle, site ssa.CallInstruction) ([]*ssa.Function, error) {
	// Avoid running the pointer analysis for static calls.
	if callee := site.Common().StaticCallee(); callee != nil {
		switch callee.String() {
		case "runtime.SetFinalizer", "(reflect.Value).Call":
			// The PTA treats calls to these intrinsics as dynamic.
			// TODO(adonovan): avoid reliance on PTA internals.

		default:
			return []*ssa.Function{callee}, nil // singleton
		}
	}

	// Dynamic call: use pointer analysis.
	o.ptaConfig.BuildCallGraph = true
	cg := ptrAnalysis(o).CallGraph
	cg.DeleteSyntheticNodes()

	// Find all call edges from the site.
	n := cg.Nodes[site.Parent()]
	if n == nil {
		return nil, fmt.Errorf("this call site is unreachable in this analysis")
	}
	calleesMap := make(map[*ssa.Function]bool)
	for _, edge := range n.Out {
		if edge.Site == site {
			calleesMap[edge.Callee.Func] = true
		}
	}

	// De-duplicate and sort.
	funcs := make([]*ssa.Function, 0, len(calleesMap))
	for f := range calleesMap {
		funcs = append(funcs, f)
	}
	sort.Sort(byFuncPos(funcs))
	return funcs, nil
}