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// Copyright 2017 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 importer
import (
"go/build"
"go/token"
"internal/buildcfg"
"internal/testenv"
"io"
"os"
"strings"
"testing"
)
func TestMain(m *testing.M) {
build.Default.GOROOT = testenv.GOROOT(nil)
os.Exit(m.Run())
}
func TestForCompiler(t *testing.T) {
testenv.MustHaveGoBuild(t)
const thePackage = "math/big"
out, err := testenv.Command(t, testenv.GoToolPath(t), "list", "-export", "-f={{context.Compiler}}:{{.Export}}", thePackage).CombinedOutput()
if err != nil {
t.Fatalf("go list %s: %v\n%s", thePackage, err, out)
}
export := strings.TrimSpace(string(out))
compiler, target, _ := strings.Cut(export, ":")
if compiler == "gccgo" {
t.Skip("golang.org/issue/22500")
}
fset := token.NewFileSet()
t.Run("LookupDefault", func(t *testing.T) {
imp := ForCompiler(fset, compiler, nil)
pkg, err := imp.Import(thePackage)
if err != nil {
t.Fatal(err)
}
if pkg.Path() != thePackage {
t.Fatalf("Path() = %q, want %q", pkg.Path(), thePackage)
}
// Check that the fileset positions are accurate.
// https://github.com/golang/go#28995
mathBigInt := pkg.Scope().Lookup("Int")
posn := fset.Position(mathBigInt.Pos()) // "$GOROOT/src/math/big/int.go:25:1"
filename := strings.Replace(posn.Filename, "$GOROOT", testenv.GOROOT(t), 1)
data, err := os.ReadFile(filename)
if err != nil {
t.Fatalf("can't read file containing declaration of math/big.Int: %v", err)
}
lines := strings.Split(string(data), "\n")
if posn.Line > len(lines) || !strings.HasPrefix(lines[posn.Line-1], "type Int") {
t.Fatalf("Object %v position %s does not contain its declaration",
mathBigInt, posn)
}
})
t.Run("LookupCustom", func(t *testing.T) {
// TODO(mdempsky): Decide whether to remove this test, or to fix
// support for it in unified IR. It's not clear that we actually
// need to support importing "math/big" as "math/bigger", for
// example. cmd/link no longer supports that.
if buildcfg.Experiment.Unified {
t.Skip("not supported by GOEXPERIMENT=unified; see go.dev/cl/406319")
}
lookup := func(path string) (io.ReadCloser, error) {
if path != "math/bigger" {
t.Fatalf("lookup called with unexpected path %q", path)
}
f, err := os.Open(target)
if err != nil {
t.Fatal(err)
}
return f, nil
}
imp := ForCompiler(fset, compiler, lookup)
pkg, err := imp.Import("math/bigger")
if err != nil {
t.Fatal(err)
}
// Even though we open math/big.a, the import request was for math/bigger
// and that should be recorded in pkg.Path(), at least for the gc toolchain.
if pkg.Path() != "math/bigger" {
t.Fatalf("Path() = %q, want %q", pkg.Path(), "math/bigger")
}
})
}
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