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| 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 | ||
| } |
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