a788e03c7b
This current implementation does not cover the following:
* Setting correct breakpoint when exiting loop
* Setting correct breakpoint when returning from function
* All facilities are available for this, it just is not taken into
account in the current `next` implementation.
102 lines
1.8 KiB
Go
102 lines
1.8 KiB
Go
package frame_test
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import (
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"debug/elf"
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"encoding/binary"
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"os"
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"path/filepath"
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"syscall"
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"testing"
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"github.com/derekparker/dbg/_helper"
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"github.com/derekparker/dbg/dwarf/_helper"
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"github.com/derekparker/dbg/dwarf/frame"
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"github.com/derekparker/dbg/proctl"
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)
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var testfile string
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func init() {
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testfile, _ = filepath.Abs("../../_fixtures/testprog")
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}
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func grabDebugFrameSection(fp string, t *testing.T) []byte {
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p, err := filepath.Abs(fp)
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if err != nil {
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t.Fatal(err)
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}
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f, err := os.Open(p)
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if err != nil {
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t.Fatal(err)
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}
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ef, err := elf.NewFile(f)
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if err != nil {
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t.Fatal(err)
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}
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data, err := ef.Section(".debug_frame").Data()
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if err != nil {
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t.Fatal(err)
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}
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return data
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}
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func TestFindReturnAddress(t *testing.T) {
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var (
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dbframe = grabDebugFrameSection(testfile, t)
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fdes = frame.Parse(dbframe)
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gsd = dwarfhelper.GosymData(testfile, t)
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)
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helper.WithTestProcess("../../_fixtures/testprog", t, func(p *proctl.DebuggedProcess) {
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testsourcefile := testfile + ".go"
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start, _, err := gsd.LineToPC(testsourcefile, 9)
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if err != nil {
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t.Fatal(err)
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}
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_, err = p.Break(uintptr(start))
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if err != nil {
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t.Fatal(err)
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}
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err = p.Continue()
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if err != nil {
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t.Fatal(err)
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}
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regs, err := p.Registers()
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if err != nil {
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t.Fatal(err)
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}
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fde, err := fdes.FDEForPC(start)
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if err != nil {
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t.Fatal(err)
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}
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end, _, err := gsd.LineToPC(testsourcefile, 19)
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if err != nil {
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t.Fatal(err)
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}
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ret := fde.ReturnAddressOffset(start)
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if err != nil {
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t.Fatal(err)
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}
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addr := uint64(int64(regs.Rsp) + ret)
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data := make([]byte, 8)
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syscall.PtracePeekText(p.Pid, uintptr(addr), data)
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addr = binary.LittleEndian.Uint64(data)
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if addr != end {
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t.Fatalf("return address not found correctly, expected %#v got %#v", end, ret)
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}
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})
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}
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