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main.go
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main.go
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// go-callvis: a tool to help visualize the call graph of a Go program.
//
package main
import (
"flag"
"fmt"
"go/build"
"log"
"os"
"strings"
"time"
"golang.org/x/tools/go/loader"
"golang.org/x/tools/go/pointer"
"golang.org/x/tools/go/ssa"
"golang.org/x/tools/go/ssa/ssautil"
)
var Version = "0.0.0-src"
var (
focusFlag = flag.String("focus", "main", "Focus package with name or import path.")
limitFlag = flag.String("limit", "", "Limit package paths to prefix. (separate multiple by comma)")
groupFlag = flag.String("group", "", "Grouping functions by [pkg, type] (separate multiple by comma).")
ignoreFlag = flag.String("ignore", "", "Ignore package paths with prefix (separate multiple by comma).")
nostdFlag = flag.Bool("nostd", false, "Omit calls to/from std packages.")
testFlag = flag.Bool("tests", false, "Include test code.")
debugFlag = flag.Bool("debug", false, "Enable verbose log.")
versionFlag = flag.Bool("version", false, "Show version and exit.")
)
func main() {
// Graphviz options
flag.UintVar(&minlen, "minlen", 2, "Minimum edge length (for wider output).")
flag.Float64Var(&nodesep, "nodesep", 0.35, "Minimum space between two adjacent nodes in the same rank (for taller output).")
flag.Parse()
if *versionFlag {
fmt.Fprintf(os.Stderr, "go-callvis %s\n", Version)
os.Exit(0)
}
if *debugFlag {
log.SetFlags(log.Lmicroseconds)
}
groupBy := make(map[string]bool)
for _, g := range strings.Split(*groupFlag, ",") {
g := strings.TrimSpace(g)
if g == "" {
continue
}
if g != "pkg" && g != "type" {
fmt.Fprintf(os.Stderr, "go-callvis: %s\n", "invalid group option")
os.Exit(1)
}
groupBy[g] = true
}
limitPaths := []string{}
for _, p := range strings.Split(*limitFlag, ",") {
p = strings.TrimSpace(p)
if p != "" {
limitPaths = append(limitPaths, p)
}
}
ignorePaths := []string{}
for _, p := range strings.Split(*ignoreFlag, ",") {
p = strings.TrimSpace(p)
if p != "" {
ignorePaths = append(ignorePaths, p)
}
}
if err := run(&build.Default, *focusFlag, groupBy, limitPaths, ignorePaths, *nostdFlag, *testFlag, flag.Args()); err != nil {
fmt.Fprintf(os.Stderr, "go-callvis: %s\n", err)
os.Exit(1)
}
}
func run(ctxt *build.Context, focus string, groupBy map[string]bool, limitPaths, ignorePaths []string, nostd, tests bool, args []string) error {
if len(args) == 0 {
return fmt.Errorf("missing arguments")
}
t0 := time.Now()
conf := loader.Config{Build: ctxt}
_, err := conf.FromArgs(args, tests)
if err != nil {
return err
}
load, err := conf.Load()
if err != nil {
return err
}
logf("loading took: %v", time.Since(t0))
logf("%d imported (%d created)", len(load.Imported), len(load.Created))
t0 = time.Now()
prog := ssautil.CreateProgram(load, 0)
prog.Build()
pkgs := prog.AllPackages()
logf("building took: %v", time.Since(t0))
var focusPkg *build.Package
if focus != "" {
focusPkg, err = conf.Build.Import(focus, "", 0)
if err != nil {
if strings.Contains(focus, "/") {
return err
}
// try to find package by name
var foundPaths []string
for _, p := range pkgs {
if p.Pkg.Name() == focus {
foundPaths = append(foundPaths, p.Pkg.Path())
}
}
if len(foundPaths) == 0 {
return err
} else if len(foundPaths) > 1 {
for _, p := range foundPaths {
fmt.Fprintf(os.Stderr, " - %s\n", p)
}
return fmt.Errorf("found %d packages with name %q, use import path not name", len(foundPaths), focus)
}
if focusPkg, err = conf.Build.Import(foundPaths[0], "", 0); err != nil {
return err
}
}
logf("focusing: %v", focusPkg.ImportPath)
}
var mains []*ssa.Package
if tests {
for _, pkg := range pkgs {
if main := prog.CreateTestMainPackage(pkg); main != nil {
mains = append(mains, main)
}
}
if mains == nil {
return fmt.Errorf("no tests")
}
} else {
mains = append(mains, ssautil.MainPackages(pkgs)...)
if len(mains) == 0 {
return fmt.Errorf("no main packages")
}
}
logf("%d packages (%d main)", len(pkgs), len(mains))
t0 = time.Now()
ptrcfg := &pointer.Config{
Mains: mains,
BuildCallGraph: true,
}
result, err := pointer.Analyze(ptrcfg)
if err != nil {
return err
}
logf("analysis took: %v", time.Since(t0))
return printOutput(mains[0].Pkg, result.CallGraph,
focusPkg, limitPaths, ignorePaths, groupBy, nostd)
}
func logf(f string, a ...interface{}) {
if *debugFlag {
log.Printf(f, a...)
}
}