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// Copyright 2013 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 gccgoimporter
import (
"bufio"
"go/types"
"os"
"os/exec"
"path/filepath"
"strings"
)
// Information about a specific installation of gccgo.
type GccgoInstallation struct {
// Version of gcc (e.g. 4.8.0).
GccVersion string
// Target triple (e.g. x86_64-unknown-linux-gnu).
TargetTriple string
// Built-in library paths used by this installation.
LibPaths []string
}
// Ask the driver at the given path for information for this GccgoInstallation.
// The given arguments are passed directly to the call of the driver.
func (inst *GccgoInstallation) InitFromDriver(gccgoPath string, args ...string) (err error) {
argv := append([]string{"-###", "-S", "-x", "go", "-"}, args...)
cmd := exec.Command(gccgoPath, argv...)
stderr, err := cmd.StderrPipe()
if err != nil {
return
}
err = cmd.Start()
if err != nil {
return
}
scanner := bufio.NewScanner(stderr)
for scanner.Scan() {
line := scanner.Text()
switch {
case strings.HasPrefix(line, "Target: "):
inst.TargetTriple = line[8:]
case line[0] == ' ':
args := strings.Fields(line)
for _, arg := range args[1:] {
if strings.HasPrefix(arg, "-L") {
inst.LibPaths = append(inst.LibPaths, arg[2:])
}
}
}
}
argv = append([]string{"-dumpversion"}, args...)
stdout, err := exec.Command(gccgoPath, argv...).Output()
if err != nil {
return
}
inst.GccVersion = strings.TrimSpace(string(stdout))
return
}
// Return the list of export search paths for this GccgoInstallation.
func (inst *GccgoInstallation) SearchPaths() (paths []string) {
for _, lpath := range inst.LibPaths {
spath := filepath.Join(lpath, "go", inst.GccVersion)
fi, err := os.Stat(spath)
if err != nil || !fi.IsDir() {
continue
}
paths = append(paths, spath)
spath = filepath.Join(spath, inst.TargetTriple)
fi, err = os.Stat(spath)
if err != nil || !fi.IsDir() {
continue
}
paths = append(paths, spath)
}
paths = append(paths, inst.LibPaths...)
return
}
// Return an importer that searches incpaths followed by the gcc installation's
// built-in search paths and the current directory.
func (inst *GccgoInstallation) GetImporter(incpaths []string, initmap map[*types.Package]InitData) Importer {
return GetImporter(append(append(incpaths, inst.SearchPaths()...), "."), initmap)
}