+++ /dev/null
-// Copyright 2016 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 gccgoexportdata provides functions for reading export data
-// files containing type information produced by the gccgo compiler.
-//
-// This package is a stop-gap until such time as gccgo uses the same
-// export data format as gc; see Go issue 17573. Once that occurs, this
-// package will be deprecated and eventually deleted.
-package gccgoexportdata
-
-// TODO(adonovan): add Find, Write, Importer to the API,
-// for symmetry with gcexportdata.
-
-import (
- "bytes"
- "debug/elf"
- "fmt"
- "go/token"
- "go/types"
- "io"
- "io/ioutil"
- "strconv"
- "strings"
-
- "golang.org/x/tools/go/internal/gccgoimporter"
-)
-
-// CompilerInfo executes the specified gccgo compiler and returns
-// information about it: its version (e.g. "4.8.0"), its target triple
-// (e.g. "x86_64-unknown-linux-gnu"), and the list of directories it
-// searches to find standard packages. The given arguments are passed
-// directly to calls to the specified gccgo compiler.
-func CompilerInfo(gccgo string, args ...string) (version, triple string, dirs []string, err error) {
- var inst gccgoimporter.GccgoInstallation
- err = inst.InitFromDriver(gccgo, args...)
- if err == nil {
- version = inst.GccVersion
- triple = inst.TargetTriple
- dirs = inst.SearchPaths()
- }
- return
-}
-
-// NewReader returns a reader for the export data section of an object
-// (.o) or archive (.a) file read from r.
-func NewReader(r io.Reader) (io.Reader, error) {
- data, err := ioutil.ReadAll(r)
- if err != nil {
- return nil, err
- }
-
- // If the file is an archive, extract the first section.
- const archiveMagic = "!<arch>\n"
- if bytes.HasPrefix(data, []byte(archiveMagic)) {
- section, err := firstSection(data[len(archiveMagic):])
- if err != nil {
- return nil, err
- }
- data = section
- }
-
- // Data contains an ELF file with a .go_export section.
- // ELF magic number is "\x7fELF".
- ef, err := elf.NewFile(bytes.NewReader(data))
- if err != nil {
- return nil, err
- }
- sec := ef.Section(".go_export")
- if sec == nil {
- return nil, fmt.Errorf("no .go_export section")
- }
- return sec.Open(), nil
-}
-
-// firstSection returns the contents of the first regular file in an ELF
-// archive (http://www.sco.com/developers/devspecs/gabi41.pdf, ยง7.2).
-func firstSection(a []byte) ([]byte, error) {
- for len(a) >= 60 {
- var hdr []byte
- hdr, a = a[:60], a[60:]
-
- name := strings.TrimSpace(string(hdr[:16]))
-
- sizeStr := string(hdr[48:58])
- size, err := strconv.Atoi(strings.TrimSpace(sizeStr))
- if err != nil {
- return nil, fmt.Errorf("invalid size: %q", sizeStr)
- }
-
- if len(a) < size {
- return nil, fmt.Errorf("invalid section size: %d", size)
- }
-
- // The payload is padded to an even number of bytes.
- var payload []byte
- payload, a = a[:size], a[size+size&1:]
-
- // Skip special files:
- // "/" archive symbol table
- // "/SYM64/" archive symbol table on e.g. s390x
- // "//" archive string table (if any filename is >15 bytes)
- if name == "/" || name == "/SYM64/" || name == "//" {
- continue
- }
-
- return payload, nil
- }
- return nil, fmt.Errorf("archive has no regular sections")
-}
-
-// Read reads export data from in, decodes it, and returns type
-// information for the package.
-// The package name is specified by path.
-//
-// The FileSet parameter is currently unused but exists for symmetry
-// with gcexportdata.
-//
-// 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, _ *token.FileSet, imports map[string]*types.Package, path string) (*types.Package, error) {
- return gccgoimporter.Parse(in, imports, path)
-}
projects / dotfiles / .git / blobdiff