Adding upstream version 1.17.13.upstream/1.17.13upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 745 insertions, 0 deletions

diff --git a/src/debug/pe/file_test.go b/src/debug/pe/file_test.go
new file mode 100644
index 0000000..8964b4f
--- /dev/null
+++ b/src/debug/pe/file_test.go
@@ -0,0 +1,745 @@
+// Copyright 2009 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 pe
+
+import (
+	"bytes"
+	"debug/dwarf"
+	"internal/testenv"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"reflect"
+	"regexp"
+	"runtime"
+	"strconv"
+	"testing"
+	"text/template"
+)
+
+type fileTest struct {
+	file           string
+	hdr            FileHeader
+	opthdr         interface{}
+	sections       []*SectionHeader
+	symbols        []*Symbol
+	hasNoDwarfInfo bool
+}
+
+var fileTests = []fileTest{
+	{
+		file: "testdata/gcc-386-mingw-obj",
+		hdr:  FileHeader{0x014c, 0x000c, 0x0, 0x64a, 0x1e, 0x0, 0x104},
+		sections: []*SectionHeader{
+			{".text", 0, 0, 36, 500, 1440, 0, 3, 0, 0x60300020},
+			{".data", 0, 0, 0, 0, 0, 0, 0, 0, 3224371264},
+			{".bss", 0, 0, 0, 0, 0, 0, 0, 0, 3224371328},
+			{".debug_abbrev", 0, 0, 137, 536, 0, 0, 0, 0, 0x42100000},
+			{".debug_info", 0, 0, 418, 673, 1470, 0, 7, 0, 1108344832},
+			{".debug_line", 0, 0, 128, 1091, 1540, 0, 1, 0, 1108344832},
+			{".rdata", 0, 0, 16, 1219, 0, 0, 0, 0, 1076887616},
+			{".debug_frame", 0, 0, 52, 1235, 1550, 0, 2, 0, 1110441984},
+			{".debug_loc", 0, 0, 56, 1287, 0, 0, 0, 0, 1108344832},
+			{".debug_pubnames", 0, 0, 27, 1343, 1570, 0, 1, 0, 1108344832},
+			{".debug_pubtypes", 0, 0, 38, 1370, 1580, 0, 1, 0, 1108344832},
+			{".debug_aranges", 0, 0, 32, 1408, 1590, 0, 2, 0, 1108344832},
+		},
+		symbols: []*Symbol{
+			{".file", 0x0, -2, 0x0, 0x67},
+			{"_main", 0x0, 1, 0x20, 0x2},
+			{".text", 0x0, 1, 0x0, 0x3},
+			{".data", 0x0, 2, 0x0, 0x3},
+			{".bss", 0x0, 3, 0x0, 0x3},
+			{".debug_abbrev", 0x0, 4, 0x0, 0x3},
+			{".debug_info", 0x0, 5, 0x0, 0x3},
+			{".debug_line", 0x0, 6, 0x0, 0x3},
+			{".rdata", 0x0, 7, 0x0, 0x3},
+			{".debug_frame", 0x0, 8, 0x0, 0x3},
+			{".debug_loc", 0x0, 9, 0x0, 0x3},
+			{".debug_pubnames", 0x0, 10, 0x0, 0x3},
+			{".debug_pubtypes", 0x0, 11, 0x0, 0x3},
+			{".debug_aranges", 0x0, 12, 0x0, 0x3},
+			{"___main", 0x0, 0, 0x20, 0x2},
+			{"_puts", 0x0, 0, 0x20, 0x2},
+		},
+	},
+	{
+		file: "testdata/gcc-386-mingw-exec",
+		hdr:  FileHeader{0x014c, 0x000f, 0x4c6a1b60, 0x3c00, 0x282, 0xe0, 0x107},
+		opthdr: &OptionalHeader32{
+			0x10b, 0x2, 0x38, 0xe00, 0x1a00, 0x200, 0x1160, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x10000, 0x400, 0x14abb, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0x5000, 0x3c8},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x7000, 0x18},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			},
+		},
+		sections: []*SectionHeader{
+			{".text", 0xcd8, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060},
+			{".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".rdata", 0x120, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".bss", 0xdc, 0x4000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0400080},
+			{".idata", 0x3c8, 0x5000, 0x400, 0x1600, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".CRT", 0x18, 0x6000, 0x200, 0x1a00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".tls", 0x20, 0x7000, 0x200, 0x1c00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".debug_aranges", 0x20, 0x8000, 0x200, 0x1e00, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_pubnames", 0x51, 0x9000, 0x200, 0x2000, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_pubtypes", 0x91, 0xa000, 0x200, 0x2200, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_info", 0xe22, 0xb000, 0x1000, 0x2400, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_abbrev", 0x157, 0xc000, 0x200, 0x3400, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_line", 0x144, 0xd000, 0x200, 0x3600, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+			{".debug_frame", 0x34, 0xe000, 0x200, 0x3800, 0x0, 0x0, 0x0, 0x0, 0x42300000},
+			{".debug_loc", 0x38, 0xf000, 0x200, 0x3a00, 0x0, 0x0, 0x0, 0x0, 0x42100000},
+		},
+	},
+	{
+		file: "testdata/gcc-386-mingw-no-symbols-exec",
+		hdr:  FileHeader{0x14c, 0x8, 0x69676572, 0x0, 0x0, 0xe0, 0x30f},
+		opthdr: &OptionalHeader32{0x10b, 0x2, 0x18, 0xe00, 0x1e00, 0x200, 0x1280, 0x1000, 0x2000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x1, 0x0, 0x4, 0x0, 0x0, 0x9000, 0x400, 0x5306, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0x6000, 0x378},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x8004, 0x18},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x60b8, 0x7c},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			},
+		},
+		sections: []*SectionHeader{
+			{".text", 0xc64, 0x1000, 0xe00, 0x400, 0x0, 0x0, 0x0, 0x0, 0x60500060},
+			{".data", 0x10, 0x2000, 0x200, 0x1200, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".rdata", 0x134, 0x3000, 0x200, 0x1400, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".eh_fram", 0x3a0, 0x4000, 0x400, 0x1600, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".bss", 0x60, 0x5000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0300080},
+			{".idata", 0x378, 0x6000, 0x400, 0x1a00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".CRT", 0x18, 0x7000, 0x200, 0x1e00, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".tls", 0x20, 0x8000, 0x200, 0x2000, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+		},
+		hasNoDwarfInfo: true,
+	},
+	{
+		file: "testdata/gcc-amd64-mingw-obj",
+		hdr:  FileHeader{0x8664, 0x6, 0x0, 0x198, 0x12, 0x0, 0x4},
+		sections: []*SectionHeader{
+			{".text", 0x0, 0x0, 0x30, 0x104, 0x15c, 0x0, 0x3, 0x0, 0x60500020},
+			{".data", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500040},
+			{".bss", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0500080},
+			{".rdata", 0x0, 0x0, 0x10, 0x134, 0x0, 0x0, 0x0, 0x0, 0x40500040},
+			{".xdata", 0x0, 0x0, 0xc, 0x144, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".pdata", 0x0, 0x0, 0xc, 0x150, 0x17a, 0x0, 0x3, 0x0, 0x40300040},
+		},
+		symbols: []*Symbol{
+			{".file", 0x0, -2, 0x0, 0x67},
+			{"main", 0x0, 1, 0x20, 0x2},
+			{".text", 0x0, 1, 0x0, 0x3},
+			{".data", 0x0, 2, 0x0, 0x3},
+			{".bss", 0x0, 3, 0x0, 0x3},
+			{".rdata", 0x0, 4, 0x0, 0x3},
+			{".xdata", 0x0, 5, 0x0, 0x3},
+			{".pdata", 0x0, 6, 0x0, 0x3},
+			{"__main", 0x0, 0, 0x20, 0x2},
+			{"puts", 0x0, 0, 0x20, 0x2},
+		},
+		hasNoDwarfInfo: true,
+	},
+	{
+		file: "testdata/gcc-amd64-mingw-exec",
+		hdr:  FileHeader{0x8664, 0x11, 0x53e4364f, 0x39600, 0x6fc, 0xf0, 0x27},
+		opthdr: &OptionalHeader64{
+			0x20b, 0x2, 0x16, 0x6a00, 0x2400, 0x1600, 0x14e0, 0x1000, 0x400000, 0x1000, 0x200, 0x4, 0x0, 0x0, 0x0, 0x5, 0x2, 0x0, 0x45000, 0x600, 0x46f19, 0x3, 0x0, 0x200000, 0x1000, 0x100000, 0x1000, 0x0, 0x10,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0xe000, 0x990},
+				{0x0, 0x0},
+				{0xa000, 0x498},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x10000, 0x28},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0xe254, 0x218},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			}},
+		sections: []*SectionHeader{
+			{".text", 0x6860, 0x1000, 0x6a00, 0x600, 0x0, 0x0, 0x0, 0x0, 0x60500020},
+			{".data", 0xe0, 0x8000, 0x200, 0x7000, 0x0, 0x0, 0x0, 0x0, 0xc0500040},
+			{".rdata", 0x6b0, 0x9000, 0x800, 0x7200, 0x0, 0x0, 0x0, 0x0, 0x40600040},
+			{".pdata", 0x498, 0xa000, 0x600, 0x7a00, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".xdata", 0x488, 0xb000, 0x600, 0x8000, 0x0, 0x0, 0x0, 0x0, 0x40300040},
+			{".bss", 0x1410, 0xc000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc0600080},
+			{".idata", 0x990, 0xe000, 0xa00, 0x8600, 0x0, 0x0, 0x0, 0x0, 0xc0300040},
+			{".CRT", 0x68, 0xf000, 0x200, 0x9000, 0x0, 0x0, 0x0, 0x0, 0xc0400040},
+			{".tls", 0x48, 0x10000, 0x200, 0x9200, 0x0, 0x0, 0x0, 0x0, 0xc0600040},
+			{".debug_aranges", 0x600, 0x11000, 0x600, 0x9400, 0x0, 0x0, 0x0, 0x0, 0x42500040},
+			{".debug_info", 0x1316e, 0x12000, 0x13200, 0x9a00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_abbrev", 0x2ccb, 0x26000, 0x2e00, 0x1cc00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_line", 0x3c4d, 0x29000, 0x3e00, 0x1fa00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_frame", 0x18b8, 0x2d000, 0x1a00, 0x23800, 0x0, 0x0, 0x0, 0x0, 0x42400040},
+			{".debug_str", 0x396, 0x2f000, 0x400, 0x25200, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_loc", 0x13240, 0x30000, 0x13400, 0x25600, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".debug_ranges", 0xa70, 0x44000, 0xc00, 0x38a00, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+		},
+	},
+	{
+		// testdata/vmlinuz-4.15.0-47-generic is a trimmed down version of Linux Kernel image.
+		// The original Linux Kernel image is about 8M and it is not recommended to add such a big binary file to the repo.
+		// Moreover only a very small portion of the original Kernel image was being parsed by debug/pe package.
+		// In order to identify this portion, the original image was first parsed by modified debug/pe package.
+		// Modification essentially communicated reader's positions before and after parsing.
+		// Finally, bytes between those positions where written to a separate file,
+		// generating trimmed down version Linux Kernel image used in this test case.
+		file: "testdata/vmlinuz-4.15.0-47-generic",
+		hdr:  FileHeader{0x8664, 0x4, 0x0, 0x0, 0x1, 0xa0, 0x206},
+		opthdr: &OptionalHeader64{
+			0x20b, 0x2, 0x14, 0x7c0590, 0x0, 0x168f870, 0x4680, 0x200, 0x0, 0x20, 0x20, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1e50000, 0x200, 0x7c3ab0, 0xa, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x6,
+			[16]DataDirectory{
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x7c07a0, 0x778},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+				{0x0, 0x0},
+			}},
+		sections: []*SectionHeader{
+			{".setup", 0x41e0, 0x200, 0x41e0, 0x200, 0x0, 0x0, 0x0, 0x0, 0x60500020},
+			{".reloc", 0x20, 0x43e0, 0x20, 0x43e0, 0x0, 0x0, 0x0, 0x0, 0x42100040},
+			{".text", 0x7bc390, 0x4400, 0x7bc390, 0x4400, 0x0, 0x0, 0x0, 0x0, 0x60500020},
+			{".bss", 0x168f870, 0x7c0790, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc8000080},
+		},
+		hasNoDwarfInfo: true,
+	},
+}
+
+func isOptHdrEq(a, b interface{}) bool {
+	switch va := a.(type) {
+	case *OptionalHeader32:
+		vb, ok := b.(*OptionalHeader32)
+		if !ok {
+			return false
+		}
+		return *vb == *va
+	case *OptionalHeader64:
+		vb, ok := b.(*OptionalHeader64)
+		if !ok {
+			return false
+		}
+		return *vb == *va
+	case nil:
+		return b == nil
+	}
+	return false
+}
+
+func TestOpen(t *testing.T) {
+	for i := range fileTests {
+		tt := &fileTests[i]
+
+		f, err := Open(tt.file)
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if !reflect.DeepEqual(f.FileHeader, tt.hdr) {
+			t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.FileHeader, tt.hdr)
+			continue
+		}
+		if !isOptHdrEq(tt.opthdr, f.OptionalHeader) {
+			t.Errorf("open %s:\n\thave %#v\n\twant %#v\n", tt.file, f.OptionalHeader, tt.opthdr)
+			continue
+		}
+
+		for i, sh := range f.Sections {
+			if i >= len(tt.sections) {
+				break
+			}
+			have := &sh.SectionHeader
+			want := tt.sections[i]
+			if !reflect.DeepEqual(have, want) {
+				t.Errorf("open %s, section %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+			}
+		}
+		tn := len(tt.sections)
+		fn := len(f.Sections)
+		if tn != fn {
+			t.Errorf("open %s: len(Sections) = %d, want %d", tt.file, fn, tn)
+		}
+		for i, have := range f.Symbols {
+			if i >= len(tt.symbols) {
+				break
+			}
+			want := tt.symbols[i]
+			if !reflect.DeepEqual(have, want) {
+				t.Errorf("open %s, symbol %d:\n\thave %#v\n\twant %#v\n", tt.file, i, have, want)
+			}
+		}
+		if !tt.hasNoDwarfInfo {
+			_, err = f.DWARF()
+			if err != nil {
+				t.Errorf("fetching %s dwarf details failed: %v", tt.file, err)
+			}
+		}
+	}
+}
+
+func TestOpenFailure(t *testing.T) {
+	filename := "file.go"    // not a PE file
+	_, err := Open(filename) // don't crash
+	if err == nil {
+		t.Errorf("open %s: succeeded unexpectedly", filename)
+	}
+}
+
+const (
+	linkNoCgo = iota
+	linkCgoDefault
+	linkCgoInternal
+	linkCgoExternal
+)
+
+func getImageBase(f *File) uintptr {
+	switch oh := f.OptionalHeader.(type) {
+	case *OptionalHeader32:
+		return uintptr(oh.ImageBase)
+	case *OptionalHeader64:
+		return uintptr(oh.ImageBase)
+	default:
+		panic("unexpected optionalheader type")
+	}
+}
+
+func testDWARF(t *testing.T, linktype int) {
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping windows only test")
+	}
+	testenv.MustHaveGoRun(t)
+
+	tmpdir := t.TempDir()
+
+	src := filepath.Join(tmpdir, "a.go")
+	file, err := os.Create(src)
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = template.Must(template.New("main").Parse(testprog)).Execute(file, linktype != linkNoCgo)
+	if err != nil {
+		if err := file.Close(); err != nil {
+			t.Error(err)
+		}
+		t.Fatal(err)
+	}
+	if err := file.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	exe := filepath.Join(tmpdir, "a.exe")
+	args := []string{"build", "-o", exe}
+	switch linktype {
+	case linkNoCgo:
+	case linkCgoDefault:
+	case linkCgoInternal:
+		args = append(args, "-ldflags", "-linkmode=internal")
+	case linkCgoExternal:
+		args = append(args, "-ldflags", "-linkmode=external")
+	default:
+		t.Fatalf("invalid linktype parameter of %v", linktype)
+	}
+	args = append(args, src)
+	out, err := exec.Command(testenv.GoToolPath(t), args...).CombinedOutput()
+	if err != nil {
+		t.Fatalf("building test executable for linktype %d failed: %s %s", linktype, err, out)
+	}
+	out, err = exec.Command(exe).CombinedOutput()
+	if err != nil {
+		t.Fatalf("running test executable failed: %s %s", err, out)
+	}
+	t.Logf("Testprog output:\n%s", string(out))
+
+	matches := regexp.MustCompile("offset=(.*)\n").FindStringSubmatch(string(out))
+	if len(matches) < 2 {
+		t.Fatalf("unexpected program output: %s", out)
+	}
+	wantoffset, err := strconv.ParseUint(matches[1], 0, 64)
+	if err != nil {
+		t.Fatalf("unexpected main offset %q: %s", matches[1], err)
+	}
+
+	f, err := Open(exe)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	imageBase := getImageBase(f)
+
+	var foundDebugGDBScriptsSection bool
+	for _, sect := range f.Sections {
+		if sect.Name == ".debug_gdb_scripts" {
+			foundDebugGDBScriptsSection = true
+		}
+	}
+	if !foundDebugGDBScriptsSection {
+		t.Error(".debug_gdb_scripts section is not found")
+	}
+
+	d, err := f.DWARF()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// look for main.main
+	r := d.Reader()
+	for {
+		e, err := r.Next()
+		if err != nil {
+			t.Fatal("r.Next:", err)
+		}
+		if e == nil {
+			break
+		}
+		if e.Tag == dwarf.TagSubprogram {
+			name, ok := e.Val(dwarf.AttrName).(string)
+			if ok && name == "main.main" {
+				t.Logf("Found main.main")
+				addr, ok := e.Val(dwarf.AttrLowpc).(uint64)
+				if !ok {
+					t.Fatal("Failed to get AttrLowpc")
+				}
+				offset := uintptr(addr) - imageBase
+				if offset != uintptr(wantoffset) {
+					t.Fatalf("Runtime offset (0x%x) did "+
+						"not match dwarf offset "+
+						"(0x%x)", wantoffset, offset)
+				}
+				return
+			}
+		}
+	}
+	t.Fatal("main.main not found")
+}
+
+func TestBSSHasZeros(t *testing.T) {
+	testenv.MustHaveExec(t)
+
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping windows only test")
+	}
+	gccpath, err := exec.LookPath("gcc")
+	if err != nil {
+		t.Skip("skipping test: gcc is missing")
+	}
+
+	tmpdir := t.TempDir()
+
+	srcpath := filepath.Join(tmpdir, "a.c")
+	src := `
+#include <stdio.h>
+
+int zero = 0;
+
+int
+main(void)
+{
+	printf("%d\n", zero);
+	return 0;
+}
+`
+	err = os.WriteFile(srcpath, []byte(src), 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	objpath := filepath.Join(tmpdir, "a.obj")
+	cmd := exec.Command(gccpath, "-c", srcpath, "-o", objpath)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("failed to build object file: %v - %v", err, string(out))
+	}
+
+	f, err := Open(objpath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	var bss *Section
+	for _, sect := range f.Sections {
+		if sect.Name == ".bss" {
+			bss = sect
+			break
+		}
+	}
+	if bss == nil {
+		t.Fatal("could not find .bss section")
+	}
+	data, err := bss.Data()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(data) == 0 {
+		t.Fatalf("%s file .bss section cannot be empty", objpath)
+	}
+	for _, b := range data {
+		if b != 0 {
+			t.Fatalf(".bss section has non zero bytes: %v", data)
+		}
+	}
+}
+
+func TestDWARF(t *testing.T) {
+	testDWARF(t, linkNoCgo)
+}
+
+const testprog = `
+package main
+
+import "fmt"
+import "syscall"
+import "unsafe"
+{{if .}}import "C"
+{{end}}
+
+// struct MODULEINFO from the Windows SDK
+type moduleinfo struct {
+	BaseOfDll uintptr
+	SizeOfImage uint32
+	EntryPoint uintptr
+}
+
+func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
+	return unsafe.Pointer(uintptr(p) + x)
+}
+
+func funcPC(f interface{}) uintptr {
+	var a uintptr
+	return **(**uintptr)(add(unsafe.Pointer(&f), unsafe.Sizeof(a)))
+}
+
+func main() {
+	kernel32 := syscall.MustLoadDLL("kernel32.dll")
+	psapi := syscall.MustLoadDLL("psapi.dll")
+	getModuleHandle := kernel32.MustFindProc("GetModuleHandleW")
+	getCurrentProcess := kernel32.MustFindProc("GetCurrentProcess")
+	getModuleInformation := psapi.MustFindProc("GetModuleInformation")
+
+	procHandle, _, _ := getCurrentProcess.Call()
+	moduleHandle, _, err := getModuleHandle.Call(0)
+	if moduleHandle == 0 {
+		panic(fmt.Sprintf("GetModuleHandle() failed: %d", err))
+	}
+
+	var info moduleinfo
+	ret, _, err := getModuleInformation.Call(procHandle, moduleHandle,
+		uintptr(unsafe.Pointer(&info)), unsafe.Sizeof(info))
+
+	if ret == 0 {
+		panic(fmt.Sprintf("GetModuleInformation() failed: %d", err))
+	}
+
+	offset := funcPC(main) - info.BaseOfDll
+	fmt.Printf("base=0x%x\n", info.BaseOfDll)
+	fmt.Printf("main=%p\n", main)
+	fmt.Printf("offset=0x%x\n", offset)
+}
+`
+
+func TestBuildingWindowsGUI(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping windows only test")
+	}
+	tmpdir := t.TempDir()
+
+	src := filepath.Join(tmpdir, "a.go")
+	if err := os.WriteFile(src, []byte(`package main; func main() {}`), 0644); err != nil {
+		t.Fatal(err)
+	}
+	exe := filepath.Join(tmpdir, "a.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-ldflags", "-H=windowsgui", "-o", exe, src)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("building test executable failed: %s %s", err, out)
+	}
+
+	f, err := Open(exe)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	switch oh := f.OptionalHeader.(type) {
+	case *OptionalHeader32:
+		if oh.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_GUI {
+			t.Errorf("unexpected Subsystem value: have %d, but want %d", oh.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI)
+		}
+	case *OptionalHeader64:
+		if oh.Subsystem != IMAGE_SUBSYSTEM_WINDOWS_GUI {
+			t.Errorf("unexpected Subsystem value: have %d, but want %d", oh.Subsystem, IMAGE_SUBSYSTEM_WINDOWS_GUI)
+		}
+	default:
+		t.Fatalf("unexpected OptionalHeader type: have %T, but want *pe.OptionalHeader32 or *pe.OptionalHeader64", oh)
+	}
+}
+
+func TestImportTableInUnknownSection(t *testing.T) {
+	if runtime.GOOS != "windows" {
+		t.Skip("skipping Windows-only test")
+	}
+
+	// ws2_32.dll import table is located in ".rdata" section,
+	// so it is good enough to test issue #16103.
+	const filename = "ws2_32.dll"
+	path, err := exec.LookPath(filename)
+	if err != nil {
+		t.Fatalf("unable to locate required file %q in search path: %s", filename, err)
+	}
+
+	f, err := Open(path)
+	if err != nil {
+		t.Error(err)
+	}
+	defer f.Close()
+
+	// now we can extract its imports
+	symbols, err := f.ImportedSymbols()
+	if err != nil {
+		t.Error(err)
+	}
+
+	if len(symbols) == 0 {
+		t.Fatalf("unable to locate any imported symbols within file %q.", path)
+	}
+}
+
+func TestInvalidOptionalHeaderMagic(t *testing.T) {
+	// Files with invalid optional header magic should return error from NewFile()
+	// (see https://golang.org/issue/30250 and https://golang.org/issue/32126 for details).
+	// Input generated by gofuzz
+	data := []byte("\x00\x00\x00\x0000000\x00\x00\x00\x00\x00\x00\x000000" +
+		"00000000000000000000" +
+		"000000000\x00\x00\x0000000000" +
+		"00000000000000000000" +
+		"0000000000000000")
+
+	_, err := NewFile(bytes.NewReader(data))
+	if err == nil {
+		t.Fatal("NewFile succeeded unexpectedly")
+	}
+}
+
+func TestImportedSymbolsNoPanicMissingOptionalHeader(t *testing.T) {
+	// https://golang.org/issue/30250
+	// ImportedSymbols shouldn't panic if optional headers is missing
+	data, err := os.ReadFile("testdata/gcc-amd64-mingw-obj")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	f, err := NewFile(bytes.NewReader(data))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if f.OptionalHeader != nil {
+		t.Fatal("expected f.OptionalHeader to be nil, received non-nil optional header")
+	}
+
+	syms, err := f.ImportedSymbols()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(syms) != 0 {
+		t.Fatalf("expected len(syms) == 0, received len(syms) = %d", len(syms))
+	}
+
+}
+
+func TestImportedSymbolsNoPanicWithSliceOutOfBound(t *testing.T) {
+	// https://golang.org/issue/30253
+	// ImportedSymbols shouldn't panic with slice out of bounds
+	// Input generated by gofuzz
+	data := []byte("L\x01\b\x00regi\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x00\x0f\x03" +
+		"\v\x01\x02\x18\x00\x0e\x00\x00\x00\x1e\x00\x00\x00\x02\x00\x00\x80\x12\x00\x00" +
+		"\x00\x10\x00\x00\x00 \x00\x00\x00\x00@\x00\x00\x10\x00\x00\x00\x02\x00\x00" +
+		"\x04\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x90\x00\x00" +
+		"\x00\x04\x00\x00\x06S\x00\x00\x03\x00\x00\x00\x00\x00 \x00\x00\x10\x00\x00" +
+		"\x00\x00\x10\x00\x00\x10\x00\x00\x00\x00\x00\x00\x10\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00`\x00\x00x\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x04\x80\x00\x00\x18\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xb8`\x00\x00|\x00\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x00\x00\x00\x00.text\x00\x00\x00d\f\x00\x00\x00\x10\x00\x00" +
+		"\x00\x0e\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"`\x00P`.data\x00\x00\x00\x10\x00\x00\x00\x00 \x00\x00" +
+		"\x00\x02\x00\x00\x00\x12\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"@\x000\xc0.rdata\x00\x004\x01\x00\x00\x000\x00\x00" +
+		"\x00\x02\x00\x00\x00\x14\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"@\x000@.eh_fram\xa0\x03\x00\x00\x00@\x00\x00" +
+		"\x00\x04\x00\x00\x00\x16\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"@\x000@.bss\x00\x00\x00\x00`\x00\x00\x00\x00P\x00\x00" +
+		"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
+		"\x80\x000\xc0.idata\x00\x00x\x03\x00\x00\x00`\x00\x00" +
+		"\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00@\x00" +
+		"0\xc0.CRT\x00\x00\x00\x00\x18\x00\x00\x00\x00p\x00\x00\x00\x02" +
+		"\x00\x00\x00\x1e\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00@\x00" +
+		"0\xc0.tls\x00\x00\x00\x00 \x00\x00\x00\x00\x80\x00\x00\x00\x02" +
+		"\x00\x00\x00 \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x001\xc9" +
+		"H\x895\x1d")
+
+	f, err := NewFile(bytes.NewReader(data))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	syms, err := f.ImportedSymbols()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(syms) != 0 {
+		t.Fatalf("expected len(syms) == 0, received len(syms) = %d", len(syms))
+	}
+}