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// Copyright 2013 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 interp_test
// This test runs the SSA interpreter over sample Go programs.
// Because the interpreter requires intrinsics for assembly
// functions and many low-level runtime routines, it is inherently
// not robust to evolutionary change in the standard library.
// Therefore the test cases are restricted to programs that
// use a fake standard library in testdata/src containing a tiny
// subset of simple functions useful for writing assertions.
//
// We no longer attempt to interpret any real standard packages such as
// fmt or testing, as it proved too fragile.
import (
"bytes"
"fmt"
"go/build"
"go/types"
"log"
"os"
"path/filepath"
"strings"
"testing"
"time"
"golang.org/x/tools/go/loader"
"golang.org/x/tools/go/ssa"
"golang.org/x/tools/go/ssa/interp"
"golang.org/x/tools/go/ssa/ssautil"
)
// Each line contains a space-separated list of $GOROOT/test/
// filenames comprising the main package of a program.
// They are ordered quickest-first, roughly.
//
// If a test in this list fails spuriously, remove it.
var gorootTestTests = []string{
"235.go",
"alias1.go",
"func5.go",
"func6.go",
"func7.go",
"func8.go",
"helloworld.go",
"varinit.go",
"escape3.go",
"initcomma.go",
"cmp.go",
"compos.go",
"turing.go",
"indirect.go",
"complit.go",
"for.go",
"struct0.go",
"intcvt.go",
"printbig.go",
"deferprint.go",
"escape.go",
"range.go",
"const4.go",
"float_lit.go",
"bigalg.go",
"decl.go",
"if.go",
"named.go",
"bigmap.go",
"func.go",
"reorder2.go",
"gc.go",
"simassign.go",
"iota.go",
"nilptr2.go",
"utf.go",
"method.go",
"char_lit.go",
"env.go",
"int_lit.go",
"string_lit.go",
"defer.go",
"typeswitch.go",
"stringrange.go",
"reorder.go",
"method3.go",
"literal.go",
"nul1.go", // doesn't actually assert anything (errorcheckoutput)
"zerodivide.go",
"convert.go",
"convT2X.go",
"switch.go",
"ddd.go",
"blank.go", // partly disabled
"closedchan.go",
"divide.go",
"rename.go",
"nil.go",
"recover1.go",
"recover2.go",
"recover3.go",
"typeswitch1.go",
"floatcmp.go",
"crlf.go", // doesn't actually assert anything (runoutput)
}
// These are files in go.tools/go/ssa/interp/testdata/.
var testdataTests = []string{
"boundmeth.go",
"complit.go",
"convert.go",
"coverage.go",
"defer.go",
"fieldprom.go",
"ifaceconv.go",
"ifaceprom.go",
"initorder.go",
"methprom.go",
"mrvchain.go",
"range.go",
"recover.go",
"reflect.go",
"static.go",
}
func run(t *testing.T, input string) bool {
// The recover2 test case is broken on Go 1.14+. See golang/go#34089.
// TODO(matloob): Fix this.
if filepath.Base(input) == "recover2.go" {
t.Skip("The recover2.go test is broken in go1.14+. See golang.org/issue/34089.")
}
t.Logf("Input: %s\n", input)
start := time.Now()
ctx := build.Default // copy
ctx.GOROOT = "testdata" // fake goroot
ctx.GOOS = "linux"
ctx.GOARCH = "amd64"
conf := loader.Config{Build: &ctx}
if _, err := conf.FromArgs([]string{input}, true); err != nil {
t.Errorf("FromArgs(%s) failed: %s", input, err)
return false
}
conf.Import("runtime")
// Print a helpful hint if we don't make it to the end.
var hint string
defer func() {
if hint != "" {
fmt.Println("FAIL")
fmt.Println(hint)
} else {
fmt.Println("PASS")
}
interp.CapturedOutput = nil
}()
hint = fmt.Sprintf("To dump SSA representation, run:\n%% go build golang.org/x/tools/cmd/ssadump && ./ssadump -test -build=CFP %s\n", input)
iprog, err := conf.Load()
if err != nil {
t.Errorf("conf.Load(%s) failed: %s", input, err)
return false
}
prog := ssautil.CreateProgram(iprog, ssa.SanityCheckFunctions)
prog.Build()
mainPkg := prog.Package(iprog.Created[0].Pkg)
if mainPkg == nil {
t.Fatalf("not a main package: %s", input)
}
interp.CapturedOutput = new(bytes.Buffer)
hint = fmt.Sprintf("To trace execution, run:\n%% go build golang.org/x/tools/cmd/ssadump && ./ssadump -build=C -test -run --interp=T %s\n", input)
exitCode := interp.Interpret(mainPkg, 0, &types.StdSizes{WordSize: 8, MaxAlign: 8}, input, []string{})
if exitCode != 0 {
t.Fatalf("interpreting %s: exit code was %d", input, exitCode)
}
// $GOROOT/test tests use this convention:
if strings.Contains(interp.CapturedOutput.String(), "BUG") {
t.Fatalf("interpreting %s: exited zero but output contained 'BUG'", input)
}
hint = "" // call off the hounds
if false {
t.Log(input, time.Since(start)) // test profiling
}
return true
}
func printFailures(failures []string) {
if failures != nil {
fmt.Println("The following tests failed:")
for _, f := range failures {
fmt.Printf("\t%s\n", f)
}
}
}
// TestTestdataFiles runs the interpreter on testdata/*.go.
func TestTestdataFiles(t *testing.T) {
cwd, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
var failures []string
for _, input := range testdataTests {
if !run(t, filepath.Join(cwd, "testdata", input)) {
failures = append(failures, input)
}
}
printFailures(failures)
}
// TestGorootTest runs the interpreter on $GOROOT/test/*.go.
func TestGorootTest(t *testing.T) {
var failures []string
for _, input := range gorootTestTests {
if !run(t, filepath.Join(build.Default.GOROOT, "test", input)) {
failures = append(failures, input)
}
}
printFailures(failures)
}
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