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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pointer
// This file runs the pointer analysis on all packages and tests beneath
// $GOROOT. It provides a "smoke test" that the analysis doesn't crash
// on a large input, and a benchmark for performance measurement.
//
// Because it is relatively slow, the --stdlib flag must be enabled for
// this test to run:
// % go test -v golang.org/x/tools/go/pointer --stdlib
import (
"flag"
"go/build"
"go/token"
"testing"
"time"
"llvm.org/llgo/third_party/gotools/go/buildutil"
"llvm.org/llgo/third_party/gotools/go/loader"
"llvm.org/llgo/third_party/gotools/go/ssa"
"llvm.org/llgo/third_party/gotools/go/ssa/ssautil"
)
var runStdlibTest = flag.Bool("stdlib", false, "Run the (slow) stdlib test")
func TestStdlib(t *testing.T) {
if !*runStdlibTest {
t.Skip("skipping (slow) stdlib test (use --stdlib)")
}
// Load, parse and type-check the program.
ctxt := build.Default // copy
ctxt.GOPATH = "" // disable GOPATH
conf := loader.Config{Build: &ctxt}
if _, err := conf.FromArgs(buildutil.AllPackages(conf.Build), true); err != nil {
t.Errorf("FromArgs failed: %v", err)
return
}
iprog, err := conf.Load()
if err != nil {
t.Fatalf("Load failed: %v", err)
}
// Create SSA packages.
prog := ssa.Create(iprog, 0)
prog.BuildAll()
numPkgs := len(prog.AllPackages())
if want := 240; numPkgs < want {
t.Errorf("Loaded only %d packages, want at least %d", numPkgs, want)
}
// Determine the set of packages/tests to analyze.
var testPkgs []*ssa.Package
for _, info := range iprog.InitialPackages() {
testPkgs = append(testPkgs, prog.Package(info.Pkg))
}
testmain := prog.CreateTestMainPackage(testPkgs...)
if testmain == nil {
t.Fatal("analysis scope has tests")
}
// Run the analysis.
config := &Config{
Reflection: false, // TODO(adonovan): fix remaining bug in rVCallConstraint, then enable.
BuildCallGraph: true,
Mains: []*ssa.Package{testmain},
}
// TODO(adonovan): add some query values (affects track bits).
t0 := time.Now()
result, err := Analyze(config)
if err != nil {
t.Fatal(err) // internal error in pointer analysis
}
_ = result // TODO(adonovan): measure something
t1 := time.Now()
// Dump some statistics.
allFuncs := ssautil.AllFunctions(prog)
var numInstrs int
for fn := range allFuncs {
for _, b := range fn.Blocks {
numInstrs += len(b.Instrs)
}
}
// determine line count
var lineCount int
prog.Fset.Iterate(func(f *token.File) bool {
lineCount += f.LineCount()
return true
})
t.Log("#Source lines: ", lineCount)
t.Log("#Instructions: ", numInstrs)
t.Log("Pointer analysis: ", t1.Sub(t0))
}
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