github.com/cockroachdb/tools@v0.0.0-20230222021103-a6d27438930d/go/gccgoexportdata/gccgoexportdata_test.go (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package gccgoexportdata_test
     6  
     7  import (
     8  	"go/types"
     9  	"os"
    10  	"testing"
    11  
    12  	"golang.org/x/tools/go/gccgoexportdata"
    13  )
    14  
    15  // Test ensures this package can read gccgo export data from the
    16  // .go_export from a standalone ELF file or such a file in an archive
    17  // library.
    18  //
    19  // The testdata/{short,long}.a ELF archive files were produced by:
    20  //
    21  //	$ echo 'package foo; func F()' > foo.go
    22  //	$ gccgo -c -fgo-pkgpath blah foo.go
    23  //	$ objcopy -j .go_export foo.o foo.gox
    24  //	$ ar q short.a foo.gox
    25  //	$ objcopy -j .go_export foo.o name-longer-than-16-bytes.gox
    26  //	$ ar q long.a name-longer-than-16-bytes.gox
    27  //
    28  // The file long.a contains an archive string table.
    29  //
    30  // The errors.gox file (an ELF object file) comes from the toolchain's
    31  // standard library.
    32  func Test(t *testing.T) {
    33  	for _, test := range []struct {
    34  		filename, path, member, wantType string
    35  	}{
    36  		{"testdata/errors.gox", "errors", "New", "func(text string) error"},
    37  		{"testdata/short.a", "short", "F", "func()"},
    38  		{"testdata/long.a", "long", "F", "func()"},
    39  	} {
    40  		t.Logf("filename = %s", test.filename)
    41  		f, err := os.Open(test.filename)
    42  		if err != nil {
    43  			t.Error(err)
    44  			continue
    45  		}
    46  		defer f.Close()
    47  		r, err := gccgoexportdata.NewReader(f)
    48  		if err != nil {
    49  			t.Error(err)
    50  			continue
    51  		}
    52  
    53  		imports := make(map[string]*types.Package)
    54  		pkg, err := gccgoexportdata.Read(r, nil, imports, test.path)
    55  		if err != nil {
    56  			t.Error(err)
    57  			continue
    58  		}
    59  
    60  		// Check type of designated package member.
    61  		obj := pkg.Scope().Lookup(test.member)
    62  		if obj == nil {
    63  			t.Errorf("%s.%s not found", test.path, test.member)
    64  			continue
    65  		}
    66  		if obj.Type().String() != test.wantType {
    67  			t.Errorf("%s.%s.Type = %s, want %s",
    68  				test.path, test.member, obj.Type(), test.wantType)
    69  		}
    70  	}
    71  }