mirror of
https://github.com/golang/go
synced 2024-11-19 01:14:39 -07:00
4a27ee3a1b
Initial implementation. Lots of missing pieces.
Example use:
godex math
godex math.Sin
godex math.Sin math.Cos
LGTM=adonovan
R=adonovan
CC=golang-codereviews
https://golang.org/cl/76890044
89 lines
1.9 KiB
Go
89 lines
1.9 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This file implements access to gccgo-generated export data.
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package main
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import (
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"debug/elf"
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"fmt"
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"io"
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"os"
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"code.google.com/p/go.tools/go/gccgoimporter"
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"code.google.com/p/go.tools/go/importer"
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"code.google.com/p/go.tools/go/types"
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)
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func init() {
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// importer for default gccgo
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var inst gccgoimporter.GccgoInstallation
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inst.InitFromDriver("gccgo")
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register("gccgo", protect(inst.GetImporter(nil)))
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// importer for gccgo using condensed export format (experimental)
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register("gccgo-new", protect(gccgoNewImporter))
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}
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func gccgoNewImporter(packages map[string]*types.Package, path string) (*types.Package, error) {
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reader, closer, err := openGccgoExportFile(path)
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if err != nil {
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return nil, err
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}
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defer closer.Close()
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// TODO(gri) importer.ImportData takes a []byte instead of an io.Reader;
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// hence the need to read some amount of data. At the same time we don't
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// want to read the entire, potentially very large object file. For now,
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// read 10K. Fix this!
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var data = make([]byte, 10<<10)
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n, err := reader.Read(data)
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if err != nil && err != io.EOF {
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return nil, err
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}
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return importer.ImportData(packages, data[:n])
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}
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// openGccgoExportFile was copied from gccgoimporter.
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func openGccgoExportFile(fpath string) (reader io.ReadSeeker, closer io.Closer, err error) {
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f, err := os.Open(fpath)
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if err != nil {
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return
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}
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defer func() {
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if err != nil {
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f.Close()
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}
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}()
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closer = f
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var magic [4]byte
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_, err = f.ReadAt(magic[:], 0)
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if err != nil {
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return
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}
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if string(magic[:]) == "v1;\n" {
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// Raw export data.
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reader = f
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return
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}
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ef, err := elf.NewFile(f)
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if err != nil {
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return
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}
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sec := ef.Section(".go_export")
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if sec == nil {
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err = fmt.Errorf("%s: .go_export section not found", fpath)
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return
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}
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reader = sec.Open()
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return
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}
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