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// Copyright 2015 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 dwarf_test
import (
. "debug/dwarf"
"io"
"testing"
)
var (
file1C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.c"}
file1H = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line1.h"}
file2C = &LineFile{Name: "/home/austin/go.dev/src/debug/dwarf/testdata/line2.c"}
)
func TestLineELFGCC(t *testing.T) {
// Generated by:
// # gcc --version | head -n1
// gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
// # gcc -g -o line-gcc.elf line*.c
// Line table based on readelf --debug-dump=rawline,decodedline
want := []LineEntry{
{Address: 0x40059d, File: file1H, Line: 2, IsStmt: true},
{Address: 0x4005a5, File: file1H, Line: 2, IsStmt: true},
{Address: 0x4005b4, File: file1H, Line: 5, IsStmt: true},
{Address: 0x4005bd, File: file1H, Line: 6, IsStmt: true, Discriminator: 2},
{Address: 0x4005c7, File: file1H, Line: 5, IsStmt: true, Discriminator: 2},
{Address: 0x4005cb, File: file1H, Line: 5, IsStmt: false, Discriminator: 1},
{Address: 0x4005d1, File: file1H, Line: 7, IsStmt: true},
{Address: 0x4005e7, File: file1C, Line: 6, IsStmt: true},
{Address: 0x4005eb, File: file1C, Line: 7, IsStmt: true},
{Address: 0x4005f5, File: file1C, Line: 8, IsStmt: true},
{Address: 0x4005ff, File: file1C, Line: 9, IsStmt: true},
{Address: 0x400601, EndSequence: true},
{Address: 0x400601, File: file2C, Line: 4, IsStmt: true},
{Address: 0x400605, File: file2C, Line: 5, IsStmt: true},
{Address: 0x40060f, File: file2C, Line: 6, IsStmt: true},
{Address: 0x400611, EndSequence: true},
}
testLineTable(t, want, elfData(t, "testdata/line-gcc.elf"))
}
func TestLineELFClang(t *testing.T) {
// Generated by:
// # clang --version | head -n1
// Ubuntu clang version 3.4-1ubuntu3 (tags/RELEASE_34/final) (based on LLVM 3.4)
// # clang -g -o line-clang.elf line*.
want := []LineEntry{
{Address: 0x400530, File: file1C, Line: 6, IsStmt: true},
{Address: 0x400534, File: file1C, Line: 7, IsStmt: true, PrologueEnd: true},
{Address: 0x400539, File: file1C, Line: 8, IsStmt: true},
{Address: 0x400545, File: file1C, Line: 9, IsStmt: true},
{Address: 0x400550, File: file1H, Line: 2, IsStmt: true},
{Address: 0x400554, File: file1H, Line: 5, IsStmt: true, PrologueEnd: true},
{Address: 0x400568, File: file1H, Line: 6, IsStmt: true},
{Address: 0x400571, File: file1H, Line: 5, IsStmt: true},
{Address: 0x400581, File: file1H, Line: 7, IsStmt: true},
{Address: 0x400583, EndSequence: true},
{Address: 0x400590, File: file2C, Line: 4, IsStmt: true},
{Address: 0x4005a0, File: file2C, Line: 5, IsStmt: true, PrologueEnd: true},
{Address: 0x4005a7, File: file2C, Line: 6, IsStmt: true},
{Address: 0x4005b0, EndSequence: true},
}
testLineTable(t, want, elfData(t, "testdata/line-clang.elf"))
}
func TestLineSeek(t *testing.T) {
d := elfData(t, "testdata/line-gcc.elf")
// Get the line table for the first CU.
cu, err := d.Reader().Next()
if err != nil {
t.Fatal("d.Reader().Next:", err)
}
lr, err := d.LineReader(cu)
if err != nil {
t.Fatal("d.LineReader:", err)
}
// Read entries forward.
var line LineEntry
var posTable []LineReaderPos
var table []LineEntry
for {
posTable = append(posTable, lr.Tell())
err := lr.Next(&line)
if err != nil {
if err == io.EOF {
break
}
t.Fatal("lr.Next:", err)
}
table = append(table, line)
}
// Test that Reset returns to the first line.
lr.Reset()
if err := lr.Next(&line); err != nil {
t.Fatal("lr.Next after Reset failed:", err)
} else if line != table[0] {
t.Fatal("lr.Next after Reset returned", line, "instead of", table[0])
}
// Check that entries match when seeking backward.
for i := len(posTable) - 1; i >= 0; i-- {
lr.Seek(posTable[i])
err := lr.Next(&line)
if i == len(posTable)-1 {
if err != io.EOF {
t.Fatal("expected io.EOF after seek to end, got", err)
}
} else if err != nil {
t.Fatal("lr.Next after seek to", posTable[i], "failed:", err)
} else if line != table[i] {
t.Fatal("lr.Next after seek to", posTable[i], "returned", line, "instead of", table[i])
}
}
// Check that seeking to a PC returns the right line.
if err := lr.SeekPC(table[0].Address-1, &line); err != ErrUnknownPC {
t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", table[0].Address-1, err)
}
for i, testLine := range table {
if testLine.EndSequence {
if err := lr.SeekPC(testLine.Address, &line); err != ErrUnknownPC {
t.Fatalf("lr.SeekPC to %#x returned %v instead of ErrUnknownPC", testLine.Address, err)
}
continue
}
nextPC := table[i+1].Address
for pc := testLine.Address; pc < nextPC; pc++ {
if err := lr.SeekPC(pc, &line); err != nil {
t.Fatalf("lr.SeekPC to %#x failed: %v", pc, err)
} else if line != testLine {
t.Fatalf("lr.SeekPC to %#x returned %v instead of %v", pc, line, testLine)
}
}
}
}
func testLineTable(t *testing.T, want []LineEntry, d *Data) {
// Get line table from d.
var got []LineEntry
dr := d.Reader()
for {
ent, err := dr.Next()
if err != nil {
t.Fatal("dr.Next:", err)
} else if ent == nil {
break
}
if ent.Tag != TagCompileUnit {
dr.SkipChildren()
continue
}
// Decode CU's line table.
lr, err := d.LineReader(ent)
if err != nil {
t.Fatal("d.LineReader:", err)
} else if lr == nil {
continue
}
for {
var line LineEntry
err := lr.Next(&line)
if err != nil {
if err == io.EOF {
break
}
t.Fatal("lr.Next:", err)
}
got = append(got, line)
}
}
// Compare line tables.
if !compareLines(got, want) {
t.Log("Line tables do not match. Got:")
dumpLines(t, got)
t.Log("Want:")
dumpLines(t, want)
t.FailNow()
}
}
func compareLines(a, b []LineEntry) bool {
if len(a) != len(b) {
return false
}
for i := range a {
al, bl := a[i], b[i]
// If both are EndSequence, then the only other valid
// field is Address. Otherwise, test equality of all
// fields.
if al.EndSequence && bl.EndSequence && al.Address == bl.Address {
continue
}
if al.File.Name != bl.File.Name {
return false
}
al.File = nil
bl.File = nil
if al != bl {
return false
}
}
return true
}
func dumpLines(t *testing.T, lines []LineEntry) {
for _, l := range lines {
t.Logf(" %+v File:%+v", l, l.File)
}
}
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