-
Notifications
You must be signed in to change notification settings - Fork 600
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
feat: support resolve symbols in mini debug info(".gnu_debugdata") (#…
…3590) * Support resolve symbols in mini debug info * Combine dynsym and mini debug info together * Add test for mini debug info
- Loading branch information
1 parent
2959c0d
commit fba3a07
Showing
10 changed files
with
310 additions
and
92 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,114 @@ | ||
package elf | ||
|
||
import ( | ||
"bytes" | ||
"debug/elf" | ||
"io" | ||
"strings" | ||
|
||
"github.com/ianlancetaylor/demangle" | ||
) | ||
|
||
type ElfSymbolReader interface { | ||
getString(start int, demangleOptions []demangle.Option) (string, bool) | ||
} | ||
|
||
type InMemElfFile struct { | ||
elf.FileHeader | ||
Sections []elf.SectionHeader | ||
Progs []elf.ProgHeader | ||
stringCache map[int]string | ||
|
||
reader io.ReaderAt | ||
} | ||
|
||
func NewInMemElfFile(r io.ReaderAt) (*InMemElfFile, error) { | ||
res := &InMemElfFile{ | ||
reader: r, | ||
} | ||
elfFile, err := elf.NewFile(res.reader) | ||
if err != nil { | ||
return nil, err | ||
} | ||
progs := make([]elf.ProgHeader, 0, len(elfFile.Progs)) | ||
sections := make([]elf.SectionHeader, 0, len(elfFile.Sections)) | ||
for i := range elfFile.Progs { | ||
progs = append(progs, elfFile.Progs[i].ProgHeader) | ||
} | ||
for i := range elfFile.Sections { | ||
sections = append(sections, elfFile.Sections[i].SectionHeader) | ||
} | ||
res.FileHeader = elfFile.FileHeader | ||
res.Progs = progs | ||
res.Sections = sections | ||
return res, nil | ||
} | ||
|
||
func (f *InMemElfFile) Clear() { | ||
f.stringCache = nil | ||
f.Sections = nil | ||
} | ||
|
||
func (f *InMemElfFile) resetReader(r io.ReaderAt) { | ||
f.reader = r | ||
} | ||
|
||
func (f *InMemElfFile) Section(name string) *elf.SectionHeader { | ||
for i := range f.Sections { | ||
s := &f.Sections[i] | ||
if s.Name == name { | ||
return s | ||
} | ||
} | ||
return nil | ||
} | ||
|
||
func (f *InMemElfFile) sectionByType(typ elf.SectionType) *elf.SectionHeader { | ||
for i := range f.Sections { | ||
s := &f.Sections[i] | ||
if s.Type == typ { | ||
return s | ||
} | ||
} | ||
return nil | ||
} | ||
|
||
func (f *InMemElfFile) SectionData(s *elf.SectionHeader) ([]byte, error) { | ||
res := make([]byte, s.Size) | ||
if _, err := f.reader.ReadAt(res, int64(s.Offset)); err != nil { | ||
return nil, err | ||
} | ||
return res, nil | ||
} | ||
|
||
// getString extracts a string from an ELF string table. | ||
func (f *InMemElfFile) getString(start int, demangleOptions []demangle.Option) (string, bool) { | ||
if s, ok := f.stringCache[start]; ok { | ||
return s, true | ||
} | ||
const tmpBufSize = 128 | ||
var tmpBuf [tmpBufSize]byte | ||
sb := strings.Builder{} | ||
for i := 0; i < 10; i++ { | ||
_, err := f.reader.ReadAt(tmpBuf[:], int64(start+i*tmpBufSize)) | ||
if err != nil { | ||
return "", false | ||
} | ||
idx := bytes.IndexByte(tmpBuf[:], 0) | ||
if idx >= 0 { | ||
sb.Write(tmpBuf[:idx]) | ||
s := sb.String() | ||
if len(demangleOptions) > 0 { | ||
s = demangle.Filter(s, demangleOptions...) | ||
} | ||
if f.stringCache == nil { | ||
f.stringCache = make(map[int]string) | ||
} | ||
f.stringCache[start] = s | ||
return s, true | ||
} else { | ||
sb.Write(tmpBuf[:]) | ||
} | ||
} | ||
return "", false | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.