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[gostls13.git] / src / debug / dwarf / line_test.go
1 // Copyright 2015 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 dwarf_test
6
7 import (
8         . "debug/dwarf"
9         "io"
10         "strings"
11         "testing"
12 )
13
14 var (
15         file1C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.c"}
16         file1H = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.h"}
17         file2C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line2.c"}
18 )
19
20 func TestLineELFGCC(t *testing.T) {
21         // Generated by:
22         //   # gcc --version | head -n1
23         //   gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
24         //   # gcc -g -o line-gcc.elf line*.c
25
26         // Line table based on readelf --debug-dump=rawline,decodedline
27         want := []LineEntry{
28                 {Address: 0x40059d, File: file1H, Line: 2, IsStmt: true},
29                 {Address: 0x4005a5, File: file1H, Line: 2, IsStmt: true},
30                 {Address: 0x4005b4, File: file1H, Line: 5, IsStmt: true},
31                 {Address: 0x4005bd, File: file1H, Line: 6, IsStmt: true, Discriminator: 2},
32                 {Address: 0x4005c7, File: file1H, Line: 5, IsStmt: true, Discriminator: 2},
33                 {Address: 0x4005cb, File: file1H, Line: 5, IsStmt: false, Discriminator: 1},
34                 {Address: 0x4005d1, File: file1H, Line: 7, IsStmt: true},
35                 {Address: 0x4005e7, File: file1C, Line: 6, IsStmt: true},
36                 {Address: 0x4005eb, File: file1C, Line: 7, IsStmt: true},
37                 {Address: 0x4005f5, File: file1C, Line: 8, IsStmt: true},
38                 {Address: 0x4005ff, File: file1C, Line: 9, IsStmt: true},
39                 {Address: 0x400601, EndSequence: true},
40
41                 {Address: 0x400601, File: file2C, Line: 4, IsStmt: true},
42                 {Address: 0x400605, File: file2C, Line: 5, IsStmt: true},
43                 {Address: 0x40060f, File: file2C, Line: 6, IsStmt: true},
44                 {Address: 0x400611, EndSequence: true},
45         }
46         files := [][]*LineFile{{nil, file1H, file1C}, {nil, file2C}}
47
48         testLineTable(t, want, files, elfData(t, "testdata/line-gcc.elf"))
49 }
50
51 func TestLineGCCWindows(t *testing.T) {
52         // Generated by:
53         //   > gcc --version
54         //   gcc (tdm64-1) 4.9.2
55         //   > gcc -g -o line-gcc-win.bin line1.c C:\workdir\go\src\debug\dwarf\testdata\line2.c
56
57         toWindows := func(lf *LineFile) *LineFile {
58                 lf2 := *lf
59                 lf2.Name = strings.Replace(lf2.Name, "/home/austin/go.dev/", "C:\\workdir\\go\\", -1)
60                 lf2.Name = strings.Replace(lf2.Name, "/", "\\", -1)
61                 return &lf2
62         }
63         file1C := toWindows(file1C)
64         file1H := toWindows(file1H)
65         file2C := toWindows(file2C)
66
67         // Line table based on objdump --dwarf=rawline,decodedline
68         want := []LineEntry{
69                 {Address: 0x401530, File: file1H, Line: 2, IsStmt: true},
70                 {Address: 0x401538, File: file1H, Line: 5, IsStmt: true},
71                 {Address: 0x401541, File: file1H, Line: 6, IsStmt: true, Discriminator: 3},
72                 {Address: 0x40154b, File: file1H, Line: 5, IsStmt: true, Discriminator: 3},
73                 {Address: 0x40154f, File: file1H, Line: 5, IsStmt: false, Discriminator: 1},
74                 {Address: 0x401555, File: file1H, Line: 7, IsStmt: true},
75                 {Address: 0x40155b, File: file1C, Line: 6, IsStmt: true},
76                 {Address: 0x401563, File: file1C, Line: 6, IsStmt: true},
77                 {Address: 0x401568, File: file1C, Line: 7, IsStmt: true},
78                 {Address: 0x40156d, File: file1C, Line: 8, IsStmt: true},
79                 {Address: 0x401572, File: file1C, Line: 9, IsStmt: true},
80                 {Address: 0x401578, EndSequence: true},
81
82                 {Address: 0x401580, File: file2C, Line: 4, IsStmt: true},
83                 {Address: 0x401588, File: file2C, Line: 5, IsStmt: true},
84                 {Address: 0x401595, File: file2C, Line: 6, IsStmt: true},
85                 {Address: 0x40159b, EndSequence: true},
86         }
87         files := [][]*LineFile{{nil, file1H, file1C}, {nil, file2C}}
88
89         testLineTable(t, want, files, peData(t, "testdata/line-gcc-win.bin"))
90 }
91
92 func TestLineELFClang(t *testing.T) {
93         // Generated by:
94         //   # clang --version | head -n1
95         //   Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on LLVM 3.4)
96         //   # clang -g -o line-clang.elf line*.
97
98         want := []LineEntry{
99                 {Address: 0x400530, File: file1C, Line: 6, IsStmt: true},
100                 {Address: 0x400534, File: file1C, Line: 7, IsStmt: true, PrologueEnd: true},
101                 {Address: 0x400539, File: file1C, Line: 8, IsStmt: true},
102                 {Address: 0x400545, File: file1C, Line: 9, IsStmt: true},
103                 {Address: 0x400550, File: file1H, Line: 2, IsStmt: true},
104                 {Address: 0x400554, File: file1H, Line: 5, IsStmt: true, PrologueEnd: true},
105                 {Address: 0x400568, File: file1H, Line: 6, IsStmt: true},
106                 {Address: 0x400571, File: file1H, Line: 5, IsStmt: true},
107                 {Address: 0x400581, File: file1H, Line: 7, IsStmt: true},
108                 {Address: 0x400583, EndSequence: true},
109
110                 {Address: 0x400590, File: file2C, Line: 4, IsStmt: true},
111                 {Address: 0x4005a0, File: file2C, Line: 5, IsStmt: true, PrologueEnd: true},
112                 {Address: 0x4005a7, File: file2C, Line: 6, IsStmt: true},
113                 {Address: 0x4005b0, EndSequence: true},
114         }
115         files := [][]*LineFile{{nil, file1C, file1H}, {nil, file2C}}
116
117         testLineTable(t, want, files, elfData(t, "testdata/line-clang.elf"))
118 }
119
120 func TestLineRnglists(t *testing.T) {
121         // Test a newer file, generated by clang.
122         file := &LineFile{Name: "/usr/local/google/home/iant/foo.c"}
123         want := []LineEntry{
124                 {Address: 0x401020, File: file, Line: 12, IsStmt: true},
125                 {Address: 0x401020, File: file, Line: 13, Column: 12, IsStmt: true, PrologueEnd: true},
126                 {Address: 0x401022, File: file, Line: 13, Column: 7},
127                 {Address: 0x401024, File: file, Line: 17, Column: 1, IsStmt: true},
128                 {Address: 0x401027, File: file, Line: 16, Column: 10, IsStmt: true},
129                 {Address: 0x40102c, EndSequence: true},
130                 {Address: 0x401000, File: file, Line: 2, IsStmt: true},
131                 {Address: 0x401000, File: file, Line: 6, Column: 17, IsStmt: true, PrologueEnd: true},
132                 {Address: 0x401002, File: file, Line: 6, Column: 3},
133                 {Address: 0x401019, File: file, Line: 9, Column: 3, IsStmt: true},
134                 {Address: 0x40101a, File: file, Line: 0, Column: 3},
135                 {Address: 0x40101c, File: file, Line: 9, Column: 3},
136                 {Address: 0x40101d, EndSequence: true},
137         }
138         files := [][]*LineFile{{file}}
139
140         testLineTable(t, want, files, elfData(t, "testdata/rnglistx.elf"))
141 }
142
143 func TestLineSeek(t *testing.T) {
144         d := elfData(t, "testdata/line-gcc.elf")
145
146         // Get the line table for the first CU.
147         cu, err := d.Reader().Next()
148         if err != nil {
149                 t.Fatal("d.Reader().Next:", err)
150         }
151         lr, err := d.LineReader(cu)
152         if err != nil {
153                 t.Fatal("d.LineReader:", err)
154         }
155
156         // Read entries forward.
157         var line LineEntry
158         var posTable []LineReaderPos
159         var table []LineEntry
160         for {
161                 posTable = append(posTable, lr.Tell())
162
163                 err := lr.Next(&line)
164                 if err != nil {
165                         if err == io.EOF {
166                                 break
167                         }
168                         t.Fatal("lr.Next:", err)
169                 }
170                 table = append(table, line)
171         }
172
173         // Test that Reset returns to the first line.
174         lr.Reset()
175         if err := lr.Next(&line); err != nil {
176                 t.Fatal("lr.Next after Reset failed:", err)
177         } else if line != table[0] {
178                 t.Fatal("lr.Next after Reset returned", line, "instead of", table[0])
179         }
180
181         // Check that entries match when seeking backward.
182         for i := len(posTable) - 1; i >= 0; i-- {
183                 lr.Seek(posTable[i])
184                 err := lr.Next(&line)
185                 if i == len(posTable)-1 {
186                         if err != io.EOF {
187                                 t.Fatal("expected io.EOF after seek to end, got", err)
188                         }
189                 } else if err != nil {
190                         t.Fatal("lr.Next after seek to", posTable[i], "failed:", err)
191                 } else if line != table[i] {
192                         t.Fatal("lr.Next after seek to", posTable[i], "returned", line, "instead of", table[i])
193                 }
194         }
195
196         // Check that seeking to a PC returns the right line.
197         if err := lr.SeekPC(table[0].Address-1, &line); err != ErrUnknownPC {
198                 t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", table[0].Address-1, err)
199         }
200         for i, testLine := range table {
201                 if testLine.EndSequence {
202                         if err := lr.SeekPC(testLine.Address, &line); err != ErrUnknownPC {
203                                 t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", testLine.Address, err)
204                         }
205                         continue
206                 }
207
208                 nextPC := table[i+1].Address
209                 for pc := testLine.Address; pc < nextPC; pc++ {
210                         if err := lr.SeekPC(pc, &line); err != nil {
211                                 t.Fatalf("lr.SeekPC to %#x failed: %v", pc, err)
212                         } else if line != testLine {
213                                 t.Fatalf("lr.SeekPC to %#x returned %v instead of %v", pc, line, testLine)
214                         }
215                 }
216         }
217 }
218
219 func testLineTable(t *testing.T, want []LineEntry, files [][]*LineFile, d *Data) {
220         // Get line table from d.
221         var got []LineEntry
222         dr := d.Reader()
223         for {
224                 ent, err := dr.Next()
225                 if err != nil {
226                         t.Fatal("dr.Next:", err)
227                 } else if ent == nil {
228                         break
229                 }
230
231                 if ent.Tag != TagCompileUnit {
232                         dr.SkipChildren()
233                         continue
234                 }
235
236                 // Ignore system compilation units (this happens in
237                 // the Windows binary). We'll still decode the line
238                 // table, but won't check it.
239                 name := ent.Val(AttrName).(string)
240                 ignore := strings.HasPrefix(name, "C:/crossdev/") || strings.HasPrefix(name, "../../")
241
242                 // Decode CU's line table.
243                 lr, err := d.LineReader(ent)
244                 if err != nil {
245                         t.Fatal("d.LineReader:", err)
246                 } else if lr == nil {
247                         continue
248                 }
249
250                 for {
251                         var line LineEntry
252                         err := lr.Next(&line)
253                         if err != nil {
254                                 if err == io.EOF {
255                                         break
256                                 }
257                                 t.Fatal("lr.Next:", err)
258                         }
259                         // Ignore sources from the Windows build environment.
260                         if ignore {
261                                 continue
262                         }
263                         got = append(got, line)
264                 }
265
266                 // Check file table.
267                 if !ignore {
268                         if !compareFiles(files[0], lr.Files()) {
269                                 t.Log("File tables do not match. Got:")
270                                 dumpFiles(t, lr.Files())
271                                 t.Log("Want:")
272                                 dumpFiles(t, files[0])
273                                 t.Fail()
274                         }
275                         files = files[1:]
276                 }
277         }
278
279         // Compare line tables.
280         if !compareLines(got, want) {
281                 t.Log("Line tables do not match. Got:")
282                 dumpLines(t, got)
283                 t.Log("Want:")
284                 dumpLines(t, want)
285                 t.FailNow()
286         }
287 }
288
289 func compareFiles(a, b []*LineFile) bool {
290         if len(a) != len(b) {
291                 return false
292         }
293         for i := range a {
294                 if a[i] == nil && b[i] == nil {
295                         continue
296                 }
297                 if a[i] != nil && b[i] != nil && a[i].Name == b[i].Name {
298                         continue
299                 }
300                 return false
301         }
302         return true
303 }
304
305 func dumpFiles(t *testing.T, files []*LineFile) {
306         for i, f := range files {
307                 name := "<nil>"
308                 if f != nil {
309                         name = f.Name
310                 }
311                 t.Logf("  %d %s", i, name)
312         }
313 }
314
315 func compareLines(a, b []LineEntry) bool {
316         if len(a) != len(b) {
317                 return false
318         }
319
320         for i := range a {
321                 al, bl := a[i], b[i]
322                 // If both are EndSequence, then the only other valid
323                 // field is Address. Otherwise, test equality of all
324                 // fields.
325                 if al.EndSequence && bl.EndSequence && al.Address == bl.Address {
326                         continue
327                 }
328                 if al.File.Name != bl.File.Name {
329                         return false
330                 }
331                 al.File = nil
332                 bl.File = nil
333                 if al != bl {
334                         return false
335                 }
336         }
337         return true
338 }
339
340 func dumpLines(t *testing.T, lines []LineEntry) {
341         for _, l := range lines {
342                 t.Logf("  %+v File:%+v", l, l.File)
343         }
344 }
345
346 type joinTest struct {
347         dirname, filename string
348         path              string
349 }
350
351 var joinTests = []joinTest{
352         {"a", "b", "a/b"},
353         {"a", "", "a"},
354         {"", "b", "b"},
355         {"/a", "b", "/a/b"},
356         {"/a/", "b", "/a/b"},
357
358         {`C:\Windows\`, `System32`, `C:\Windows\System32`},
359         {`C:\Windows\`, ``, `C:\Windows\`},
360         {`C:\`, `Windows`, `C:\Windows`},
361         {`C:\Windows\`, `C:System32`, `C:\Windows\System32`},
362         {`C:\Windows`, `a/b`, `C:\Windows\a/b`},
363         {`\\host\share\`, `foo`, `\\host\share\foo`},
364         {`\\host\share\`, `foo\bar`, `\\host\share\foo\bar`},
365         {`//host/share/`, `foo/bar`, `//host/share/foo/bar`},
366
367         // Note: the Go compiler currently emits DWARF line table paths
368         // with '/' instead of '\' (see issues #19784, #36495). These
369         // tests are to cover cases that might come up for Windows Go
370         // binaries.
371         {`c:/workdir/go/src/x`, `y.go`, `c:/workdir/go/src/x/y.go`},
372         {`d:/some/thing/`, `b.go`, `d:/some/thing/b.go`},
373         {`e:\blah\`, `foo.c`, `e:\blah\foo.c`},
374
375         // The following are "best effort". We shouldn't see relative
376         // base directories in DWARF, but these test that pathJoin
377         // doesn't fail miserably if it sees one.
378         {`C:`, `a`, `C:a`},
379         {`C:`, `a\b`, `C:a\b`},
380         {`C:.`, `a`, `C:.\a`},
381         {`C:a`, `b`, `C:a\b`},
382 }
383
384 func TestPathJoin(t *testing.T) {
385         for _, test := range joinTests {
386                 got := PathJoin(test.dirname, test.filename)
387                 if test.path != got {
388                         t.Errorf("pathJoin(%q, %q) = %q, want %q", test.dirname, test.filename, got, test.path)
389                 }
390         }
391 }
392
393 func TestPathLineReaderMalformed(t *testing.T) {
394         // This test case drawn from issue #52354. What's happening
395         // here is that the stmtList attribute in the compilation
396         // unit is malformed (negative).
397         var aranges, frame, pubnames, ranges, str []byte
398         abbrev := []byte{0x10, 0x20, 0x20, 0x20, 0x21, 0x20, 0x10, 0x21, 0x61,
399                 0x0, 0x0, 0xff, 0x20, 0xff, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
400                 0x20, 0x20, 0x20, 0x20, 0x20, 0x20}
401         info := []byte{0x0, 0x0, 0x0, 0x9, 0x0, 0x2, 0x0, 0x0, 0x0, 0x0,
402                 0x20, 0x10, 0x10}
403         line := []byte{0x20}
404         Data0, err := New(abbrev, aranges, frame, info, line, pubnames, ranges, str)
405         if err != nil {
406                 t.Fatalf("error unexpected: %v", err)
407         }
408         Reader0 := Data0.Reader()
409         Entry0, err := Reader0.Next()
410         if err != nil {
411                 t.Fatalf("error unexpected: %v", err)
412         }
413         LineReader0, err := Data0.LineReader(Entry0)
414         if err == nil {
415                 t.Fatalf("expected error")
416         }
417         if LineReader0 != nil {
418                 t.Fatalf("expected nil line reader")
419         }
420 }