Function PrintAssembly

internal/report/report.go:391–516

PrintAssembly prints annotated disassembly of rpt to w.

(w io.Writer, rpt *Report, obj plugin.ObjTool, maxFuncs int)

// PrintAssembly prints annotated disassembly of rpt to w.
func PrintAssembly(w io.Writer, rpt *Report, obj plugin.ObjTool, maxFuncs int) error {
	o := rpt.options
	prof := rpt.prof

	g := rpt.newGraph(nil)

	// If the regexp source can be parsed as an address, also match
	// functions that land on that address.
	var address *uint64
	if hex, err := strconv.ParseUint(o.Symbol.String(), 0, 64); err == nil {
		address = &hex
	}

	fmt.Fprintln(w, "Total:", rpt.formatValue(rpt.total))
	symbols := symbolsFromBinaries(prof, g, o.Symbol, address, obj)
	symNodes := nodesPerSymbol(g.Nodes, symbols)

	// Sort for printing.
	var syms []*objSymbol
	for s := range symNodes {
		syms = append(syms, s)
	}
	byName := func(a, b *objSymbol) bool {
		if na, nb := a.sym.Name[0], b.sym.Name[0]; na != nb {
			return na < nb
		}
		return a.sym.Start < b.sym.Start
	}
	if maxFuncs < 0 {
		sort.Sort(orderSyms{syms, byName})
	} else {
		byFlatSum := func(a, b *objSymbol) bool {
			suma, _ := symNodes[a].Sum()
			sumb, _ := symNodes[b].Sum()
			if suma != sumb {
				return suma > sumb
			}
			return byName(a, b)
		}
		sort.Sort(orderSyms{syms, byFlatSum})
		if len(syms) > maxFuncs {
			syms = syms[:maxFuncs]
		}
	}

	if len(syms) == 0 {
		// The symbol regexp case
		if address == nil {
			return fmt.Errorf("no matches found for regexp %s", o.Symbol)
		}

		// The address case
		if len(symbols) == 0 {
			return fmt.Errorf("no matches found for address 0x%x", *address)
		}
		return fmt.Errorf("address 0x%x found in binary, but the corresponding symbols do not have samples in the profile", *address)
	}