...
Run Format

Source file src/go/internal/gccgoimporter/gccgoinstallation.go

Documentation: go/internal/gccgoimporter

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package gccgoimporter
     6  
     7  import (
     8  	"bufio"
     9  	"go/types"
    10  	"os"
    11  	"os/exec"
    12  	"path/filepath"
    13  	"strings"
    14  )
    15  
    16  // Information about a specific installation of gccgo.
    17  type GccgoInstallation struct {
    18  	// Version of gcc (e.g. 4.8.0).
    19  	GccVersion string
    20  
    21  	// Target triple (e.g. x86_64-unknown-linux-gnu).
    22  	TargetTriple string
    23  
    24  	// Built-in library paths used by this installation.
    25  	LibPaths []string
    26  }
    27  
    28  // Ask the driver at the given path for information for this GccgoInstallation.
    29  func (inst *GccgoInstallation) InitFromDriver(gccgoPath string) (err error) {
    30  	cmd := exec.Command(gccgoPath, "-###", "-S", "-x", "go", "-")
    31  	stderr, err := cmd.StderrPipe()
    32  	if err != nil {
    33  		return
    34  	}
    35  
    36  	err = cmd.Start()
    37  	if err != nil {
    38  		return
    39  	}
    40  
    41  	scanner := bufio.NewScanner(stderr)
    42  	for scanner.Scan() {
    43  		line := scanner.Text()
    44  		switch {
    45  		case strings.HasPrefix(line, "Target: "):
    46  			inst.TargetTriple = line[8:]
    47  
    48  		case line[0] == ' ':
    49  			args := strings.Fields(line)
    50  			for _, arg := range args[1:] {
    51  				if strings.HasPrefix(arg, "-L") {
    52  					inst.LibPaths = append(inst.LibPaths, arg[2:])
    53  				}
    54  			}
    55  		}
    56  	}
    57  
    58  	stdout, err := exec.Command(gccgoPath, "-dumpversion").Output()
    59  	if err != nil {
    60  		return
    61  	}
    62  	inst.GccVersion = strings.TrimSpace(string(stdout))
    63  
    64  	return
    65  }
    66  
    67  // Return the list of export search paths for this GccgoInstallation.
    68  func (inst *GccgoInstallation) SearchPaths() (paths []string) {
    69  	for _, lpath := range inst.LibPaths {
    70  		spath := filepath.Join(lpath, "go", inst.GccVersion)
    71  		fi, err := os.Stat(spath)
    72  		if err != nil || !fi.IsDir() {
    73  			continue
    74  		}
    75  		paths = append(paths, spath)
    76  
    77  		spath = filepath.Join(spath, inst.TargetTriple)
    78  		fi, err = os.Stat(spath)
    79  		if err != nil || !fi.IsDir() {
    80  			continue
    81  		}
    82  		paths = append(paths, spath)
    83  	}
    84  
    85  	paths = append(paths, inst.LibPaths...)
    86  
    87  	return
    88  }
    89  
    90  // Return an importer that searches incpaths followed by the gcc installation's
    91  // built-in search paths and the current directory.
    92  func (inst *GccgoInstallation) GetImporter(incpaths []string, initmap map[*types.Package]InitData) Importer {
    93  	return GetImporter(append(append(incpaths, inst.SearchPaths()...), "."), initmap)
    94  }
    95  

View as plain text