ardump: todo
This commit is contained in:
xushiwei
259
x/ar/ar.go
259
x/ar/ar.go
@@ -1,259 +0,0 @@
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/*
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* Copyright (c) 2023 The GoPlus Authors (goplus.org). All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
|
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* you may not use this file except in compliance with the License.
|
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* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
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*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
|
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* limitations under the License.
|
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*/
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package ar
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import (
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"bytes"
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"debug/elf"
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"debug/pe"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"time"
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wasm "github.com/aykevl/go-wasm"
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"github.com/blakesmith/ar"
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)
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// Create creates an arcive for static linking from a list of object files
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// given as a parameter. It is equivalent to the following command:
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//
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// ar -rcs <archivePath> <objs...>
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func Create(arfile string, objs []string) error {
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f, err := os.Create(arfile)
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if err != nil {
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return err
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}
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err = Make(f, objs)
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f.Close()
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if err != nil {
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os.Remove(arfile)
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}
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return err
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}
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// Make creates an arcive for static linking from a list of object files
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// given as a parameter. It is equivalent to the following command:
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//
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// ar -rcs <archivePath> <objs...>
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func Make(arfile io.WriteSeeker, objs []string) error {
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// Open the archive file.
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arwriter := ar.NewWriter(arfile)
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err := arwriter.WriteGlobalHeader()
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if err != nil {
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return err
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}
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// Open all object files and read the symbols for the symbol table.
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symbolTable := []struct {
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name string // symbol name
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fileIndex int // index into objfiles
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}{}
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archiveOffsets := make([]int32, len(objs))
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for i, objpath := range objs {
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objfile, err := os.Open(objpath)
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if err != nil {
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return err
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}
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// Read the symbols and add them to the symbol table.
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if dbg, err := elf.NewFile(objfile); err == nil {
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symbols, err := dbg.Symbols()
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if err != nil {
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return err
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}
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for _, symbol := range symbols {
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bind := elf.ST_BIND(symbol.Info)
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if bind != elf.STB_GLOBAL && bind != elf.STB_WEAK {
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// Don't include local symbols (STB_LOCAL).
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continue
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}
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if elf.ST_TYPE(symbol.Info) != elf.STT_FUNC && elf.ST_TYPE(symbol.Info) != elf.STT_OBJECT {
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// Not a function.
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continue
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}
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// Include in archive.
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symbolTable = append(symbolTable, struct {
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name string
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fileIndex int
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}{symbol.Name, i})
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}
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} else if dbg, err := pe.NewFile(objfile); err == nil {
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for _, symbol := range dbg.Symbols {
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if symbol.StorageClass != 2 {
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continue
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}
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if symbol.SectionNumber == 0 {
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continue
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}
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symbolTable = append(symbolTable, struct {
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name string
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fileIndex int
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}{symbol.Name, i})
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}
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} else if dbg, err := wasm.Parse(objfile); err == nil {
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for _, s := range dbg.Sections {
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switch section := s.(type) {
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case *wasm.SectionImport:
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for _, ln := range section.Entries {
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if ln.Kind != wasm.ExtKindFunction {
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// Not a function
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continue
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}
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symbolTable = append(symbolTable, struct {
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name string
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fileIndex int
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}{ln.Field, i})
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}
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}
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}
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} else {
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return fmt.Errorf("failed to open file %s as WASM, ELF or PE/COFF: %w", objpath, err)
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}
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// Close file, to avoid issues with too many open files (especially on
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// MacOS X).
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objfile.Close()
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}
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// Create the symbol table buffer.
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// For some (sparse) details on the file format:
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// https://en.wikipedia.org/wiki/Ar_(Unix)#System_V_(or_GNU)_variant
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buf := &bytes.Buffer{}
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binary.Write(buf, binary.BigEndian, int32(len(symbolTable)))
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for range symbolTable {
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// This is a placeholder index, it will be updated after all files have
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// been written to the archive (see the end of this function).
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err = binary.Write(buf, binary.BigEndian, int32(0))
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if err != nil {
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return err
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}
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}
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for _, sym := range symbolTable {
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_, err := buf.Write([]byte(sym.name + "\x00"))
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if err != nil {
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return err
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}
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}
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for buf.Len()%2 != 0 {
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// The symbol table must be aligned.
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// This appears to be required by lld.
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buf.WriteByte(0)
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}
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// Write the symbol table.
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err = arwriter.WriteHeader(&ar.Header{
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Name: "/",
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ModTime: time.Unix(0, 0),
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Uid: 0,
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Gid: 0,
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Mode: 0,
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Size: int64(buf.Len()),
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})
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if err != nil {
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return err
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}
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// Keep track of the start of the symbol table.
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symbolTableStart, err := arfile.Seek(0, io.SeekCurrent)
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if err != nil {
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return err
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}
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// Write symbol table contents.
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_, err = arfile.Write(buf.Bytes())
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if err != nil {
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return err
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}
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// Add all object files to the archive.
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var copyBuf bytes.Buffer
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for i, objpath := range objs {
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objfile, err := os.Open(objpath)
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if err != nil {
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return err
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}
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defer objfile.Close()
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// Store the start index, for when we'll update the symbol table with
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// the correct file start indices.
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offset, err := arfile.Seek(0, io.SeekCurrent)
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if err != nil {
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return err
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}
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if int64(int32(offset)) != offset {
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return errors.New("large archives (4GB+) not supported")
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}
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archiveOffsets[i] = int32(offset)
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// Write the file header.
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st, err := objfile.Stat()
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if err != nil {
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return err
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}
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err = arwriter.WriteHeader(&ar.Header{
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Name: filepath.Base(objfile.Name()),
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ModTime: time.Unix(0, 0),
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Uid: 0,
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Gid: 0,
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Mode: 0644,
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Size: st.Size(),
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})
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if err != nil {
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return err
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}
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// Copy the file contents into the archive.
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// First load all contents into a buffer, then write it all in one go to
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// the archive file. This is a bit complicated, but is necessary because
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// io.Copy can't deal with files that are of an odd size.
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copyBuf.Reset()
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n, err := io.Copy(©Buf, objfile)
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if err != nil {
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return fmt.Errorf("could not copy object file into ar file: %w", err)
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}
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if n != st.Size() {
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return errors.New("file modified during ar creation")
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}
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_, err = arwriter.Write(copyBuf.Bytes())
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if err != nil {
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return fmt.Errorf("could not copy object file into ar file: %w", err)
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}
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// File is not needed anymore.
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objfile.Close()
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}
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// Create symbol indices.
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indicesBuf := &bytes.Buffer{}
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for _, sym := range symbolTable {
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err = binary.Write(indicesBuf, binary.BigEndian, archiveOffsets[sym.fileIndex])
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if err != nil {
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return err
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}
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}
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// Overwrite placeholder indices.
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if _, err = arfile.Seek(symbolTableStart+4, io.SeekStart); err == nil {
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_, err = arfile.Write(indicesBuf.Bytes())
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}
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return err
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}
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43
x/ar/common.go
Normal file
43
x/ar/common.go
Normal file
@@ -0,0 +1,43 @@
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/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
|
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
|
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* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
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package ar
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import (
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"time"
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)
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const (
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headerByteSize = 60
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globalHeader = "!<arch>\n"
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)
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type Header struct {
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Name string
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ModTime time.Time
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Uid int
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Gid int
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Mode int64
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Size int64
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}
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type slicer []byte
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func (sp *slicer) next(n int) (b []byte) {
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s := *sp
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b, *sp = s[0:n], s[n:]
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return
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}
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148
x/ar/reader.go
Normal file
148
x/ar/reader.go
Normal file
@@ -0,0 +1,148 @@
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/*
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* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
|
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
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package ar
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import (
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"io"
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"strconv"
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"time"
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)
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// Provides read access to an ar archive.
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// Call next to skip files
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//
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// Example:
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// reader := NewReader(f)
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// var buf bytes.Buffer
|
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// for {
|
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// _, err := reader.Next()
|
||||
// if err == io.EOF {
|
||||
// break
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||||
// }
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// if err != nil {
|
||||
// t.Errorf(err.Error())
|
||||
// }
|
||||
// io.Copy(&buf, reader)
|
||||
// }
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|
||||
type Reader struct {
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||||
r io.Reader
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nb int64
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||||
pad int64
|
||||
}
|
||||
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||||
// Copies read data to r. Strips the global ar header.
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func NewReader(r io.Reader) *Reader {
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io.CopyN(io.Discard, r, 8) // Discard global header
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||||
|
||||
return &Reader{r: r}
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||||
}
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|
||||
func (rd *Reader) string(b []byte) string {
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||||
i := len(b) - 1
|
||||
for i > 0 && b[i] == 32 {
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||||
i--
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||||
}
|
||||
|
||||
return string(b[0 : i+1])
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||||
}
|
||||
|
||||
func (rd *Reader) numeric(b []byte) int64 {
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i := len(b) - 1
|
||||
for i > 0 && b[i] == 32 {
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||||
i--
|
||||
}
|
||||
|
||||
n, _ := strconv.ParseInt(string(b[0:i+1]), 10, 64)
|
||||
|
||||
return n
|
||||
}
|
||||
|
||||
func (rd *Reader) octal(b []byte) int64 {
|
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i := len(b) - 1
|
||||
for i > 0 && b[i] == 32 {
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i--
|
||||
}
|
||||
|
||||
n, _ := strconv.ParseInt(string(b[3:i+1]), 8, 64)
|
||||
|
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return n
|
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}
|
||||
|
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func (rd *Reader) skipUnread() error {
|
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skip := rd.nb + rd.pad
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rd.nb, rd.pad = 0, 0
|
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if seeker, ok := rd.r.(io.Seeker); ok {
|
||||
_, err := seeker.Seek(skip, io.SeekCurrent)
|
||||
return err
|
||||
}
|
||||
|
||||
_, err := io.CopyN(io.Discard, rd.r, skip)
|
||||
return err
|
||||
}
|
||||
|
||||
func (rd *Reader) readHeader() (*Header, error) {
|
||||
headerBuf := make([]byte, headerByteSize)
|
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if _, err := io.ReadFull(rd.r, headerBuf); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
header := new(Header)
|
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s := slicer(headerBuf)
|
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|
||||
header.Name = rd.string(s.next(16))
|
||||
header.ModTime = time.Unix(rd.numeric(s.next(12)), 0)
|
||||
header.Uid = int(rd.numeric(s.next(6)))
|
||||
header.Gid = int(rd.numeric(s.next(6)))
|
||||
header.Mode = rd.octal(s.next(8))
|
||||
header.Size = rd.numeric(s.next(10))
|
||||
|
||||
rd.nb = int64(header.Size)
|
||||
if header.Size%2 == 1 {
|
||||
rd.pad = 1
|
||||
} else {
|
||||
rd.pad = 0
|
||||
}
|
||||
|
||||
return header, nil
|
||||
}
|
||||
|
||||
// Call Next() to skip to the next file in the archive file.
|
||||
// Returns a Header which contains the metadata about the
|
||||
// file in the archive.
|
||||
func (rd *Reader) Next() (*Header, error) {
|
||||
err := rd.skipUnread()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return rd.readHeader()
|
||||
}
|
||||
|
||||
// Read data from the current entry in the archive.
|
||||
func (rd *Reader) Read(b []byte) (n int, err error) {
|
||||
if rd.nb == 0 {
|
||||
return 0, io.EOF
|
||||
}
|
||||
if int64(len(b)) > rd.nb {
|
||||
b = b[0:rd.nb]
|
||||
}
|
||||
n, err = rd.r.Read(b)
|
||||
rd.nb -= int64(n)
|
||||
|
||||
return
|
||||
}
|
||||
121
x/ar/writer.go
Normal file
121
x/ar/writer.go
Normal file
@@ -0,0 +1,121 @@
|
||||
/*
|
||||
* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package ar
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io"
|
||||
"strconv"
|
||||
)
|
||||
|
||||
var (
|
||||
errWriteTooLong = errors.New("ar: write too long")
|
||||
)
|
||||
|
||||
// Writer provides sequential writing of an ar archive.
|
||||
// An ar archive is sequence of header file pairs
|
||||
// Call WriteHeader to begin writing a new file, then call Write to supply the file's data
|
||||
//
|
||||
// Example:
|
||||
// archive := ar.NewWriter(writer)
|
||||
// archive.WriteGlobalHeader()
|
||||
// header := new(ar.Header)
|
||||
// header.Size = 15 // bytes
|
||||
//
|
||||
// if err := archive.WriteHeader(header); err != nil {
|
||||
// return err
|
||||
// }
|
||||
//
|
||||
// io.Copy(archive, data)
|
||||
type Writer struct {
|
||||
w io.Writer
|
||||
nb int64 // number of unwritten bytes for the current file entry
|
||||
}
|
||||
|
||||
// Create a new ar writer that writes to w
|
||||
func NewWriter(w io.Writer) *Writer { return &Writer{w: w} }
|
||||
|
||||
func (aw *Writer) numeric(b []byte, x int64) {
|
||||
s := strconv.FormatInt(x, 10)
|
||||
for len(s) < len(b) {
|
||||
s = s + " "
|
||||
}
|
||||
copy(b, []byte(s))
|
||||
}
|
||||
|
||||
func (aw *Writer) octal(b []byte, x int64) {
|
||||
s := "100" + strconv.FormatInt(x, 8)
|
||||
for len(s) < len(b) {
|
||||
s = s + " "
|
||||
}
|
||||
copy(b, []byte(s))
|
||||
}
|
||||
|
||||
func (aw *Writer) string(b []byte, str string) {
|
||||
s := str
|
||||
for len(s) < len(b) {
|
||||
s = s + " "
|
||||
}
|
||||
copy(b, []byte(s))
|
||||
}
|
||||
|
||||
// Writes to the current entry in the ar archive
|
||||
// Returns ErrWriteTooLong if more than header.Size
|
||||
// bytes are written after a call to WriteHeader
|
||||
func (aw *Writer) Write(b []byte) (n int, err error) {
|
||||
if int64(len(b)) > aw.nb {
|
||||
b = b[0:aw.nb]
|
||||
err = errWriteTooLong
|
||||
}
|
||||
n, werr := aw.w.Write(b)
|
||||
aw.nb -= int64(n)
|
||||
if werr != nil {
|
||||
return n, werr
|
||||
}
|
||||
|
||||
if len(b)%2 == 1 { // data size must be aligned to an even byte
|
||||
n2, _ := aw.w.Write([]byte{'\n'})
|
||||
return n + n2, err
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
func (aw *Writer) WriteGlobalHeader() error {
|
||||
_, err := aw.w.Write([]byte(globalHeader))
|
||||
return err
|
||||
}
|
||||
|
||||
// Writes the header to the underlying writer and prepares
|
||||
// to receive the file payload
|
||||
func (aw *Writer) WriteHeader(hdr *Header) error {
|
||||
aw.nb = int64(hdr.Size)
|
||||
header := make([]byte, headerByteSize)
|
||||
s := slicer(header)
|
||||
|
||||
aw.string(s.next(16), hdr.Name)
|
||||
aw.numeric(s.next(12), hdr.ModTime.Unix())
|
||||
aw.numeric(s.next(6), int64(hdr.Uid))
|
||||
aw.numeric(s.next(6), int64(hdr.Gid))
|
||||
aw.octal(s.next(8), hdr.Mode)
|
||||
aw.numeric(s.next(10), hdr.Size)
|
||||
aw.string(s.next(2), "`\n")
|
||||
|
||||
_, err := aw.w.Write(header)
|
||||
|
||||
return err
|
||||
}
|
||||
40
x/llexportdata/llexportdata.go
Normal file
40
x/llexportdata/llexportdata.go
Normal file
@@ -0,0 +1,40 @@
|
||||
/*
|
||||
* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package llexportdata
|
||||
|
||||
import (
|
||||
"go/token"
|
||||
"go/types"
|
||||
"io"
|
||||
)
|
||||
|
||||
// Read reads export data from in, decodes it, and returns type information for the package.
|
||||
//
|
||||
// The package path (effectively its linker symbol prefix) is specified by path, since unlike
|
||||
// the package name, this information may not be recorded in the export data.
|
||||
//
|
||||
// File position information is added to fset.
|
||||
//
|
||||
// Read may inspect and add to the imports map to ensure that references within the export data
|
||||
// to other packages are consistent. The caller must ensure that imports[path] does not exist,
|
||||
// or exists but is incomplete (see types.Package.Complete), and Read inserts the resulting package
|
||||
// into this map entry.
|
||||
//
|
||||
// On return, the state of the reader is undefined.
|
||||
func Read(in io.Reader, fset *token.FileSet, imports map[string]*types.Package, path string) (*types.Package, error) {
|
||||
panic("todo")
|
||||
}
|
||||
Reference in New Issue
Block a user