github.com/freddyisaac/sicortex-golang@v0.0.0-20231019035217-e03519e66f60/src/cmd/link/dwarf_test.go (about)

     1  // Copyright 2017 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 main
     6  
     7  import (
     8  	"cmd/internal/objfile"
     9  	"debug/dwarf"
    10  	"internal/testenv"
    11  	"io"
    12  	"io/ioutil"
    13  	"os"
    14  	"os/exec"
    15  	"path"
    16  	"path/filepath"
    17  	"runtime"
    18  	"strings"
    19  	"testing"
    20  )
    21  
    22  func TestDWARF(t *testing.T) {
    23  	if runtime.GOOS == "windows" {
    24  		t.Skip("DWARF is not supported on Windows")
    25  	}
    26  
    27  	testenv.MustHaveCGO(t)
    28  	testenv.MustHaveGoBuild(t)
    29  
    30  	if runtime.GOOS == "plan9" {
    31  		t.Skip("skipping on plan9; no DWARF symbol table in executables")
    32  	}
    33  
    34  	out, err := exec.Command(testenv.GoToolPath(t), "list", "-f", "{{.Stale}}", "cmd/link").CombinedOutput()
    35  	if err != nil {
    36  		t.Fatalf("go list: %v\n%s", err, out)
    37  	}
    38  	if string(out) != "false\n" {
    39  		t.Fatalf("cmd/link is stale - run go install cmd/link")
    40  	}
    41  
    42  	tmpDir, err := ioutil.TempDir("", "go-link-TestDWARF")
    43  	if err != nil {
    44  		t.Fatal("TempDir failed: ", err)
    45  	}
    46  	defer os.RemoveAll(tmpDir)
    47  
    48  	for _, prog := range []string{"testprog", "testprogcgo"} {
    49  		t.Run(prog, func(t *testing.T) {
    50  			exe := filepath.Join(tmpDir, prog+".exe")
    51  			dir := "../../runtime/testdata/" + prog
    52  			out, err := exec.Command(testenv.GoToolPath(t), "build", "-o", exe, dir).CombinedOutput()
    53  			if err != nil {
    54  				t.Fatalf("go build -o %v %v: %v\n%s", exe, dir, err, out)
    55  			}
    56  
    57  			f, err := objfile.Open(exe)
    58  			if err != nil {
    59  				t.Fatal(err)
    60  			}
    61  			defer f.Close()
    62  
    63  			syms, err := f.Symbols()
    64  			if err != nil {
    65  				t.Fatal(err)
    66  			}
    67  
    68  			var addr uint64
    69  			for _, sym := range syms {
    70  				if sym.Name == "main.main" {
    71  					addr = sym.Addr
    72  					break
    73  				}
    74  			}
    75  			if addr == 0 {
    76  				t.Fatal("cannot find main.main in symbols")
    77  			}
    78  
    79  			d, err := f.DWARF()
    80  			if err != nil {
    81  				t.Fatal(err)
    82  			}
    83  
    84  			// TODO: We'd like to use filepath.Join here.
    85  			// Also related: golang.org/issue/19784.
    86  			wantFile := path.Join(prog, "main.go")
    87  			wantLine := 24
    88  			r := d.Reader()
    89  			var line dwarf.LineEntry
    90  			for {
    91  				cu, err := r.Next()
    92  				if err != nil {
    93  					t.Fatal(err)
    94  				}
    95  				if cu == nil {
    96  					break
    97  				}
    98  				if cu.Tag != dwarf.TagCompileUnit {
    99  					r.SkipChildren()
   100  					continue
   101  				}
   102  				lr, err := d.LineReader(cu)
   103  				if err != nil {
   104  					t.Fatal(err)
   105  				}
   106  				for {
   107  					err := lr.Next(&line)
   108  					if err == io.EOF {
   109  						break
   110  					}
   111  					if err != nil {
   112  						t.Fatal(err)
   113  					}
   114  					if line.Address == addr {
   115  						if !strings.HasSuffix(line.File.Name, wantFile) || line.Line != wantLine {
   116  							t.Errorf("%#x is %s:%d, want %s:%d", addr, line.File.Name, line.Line, filepath.Join("...", wantFile), wantLine)
   117  						}
   118  						return
   119  					}
   120  				}
   121  			}
   122  			t.Fatalf("did not find file:line for %#x (main.main)", addr)
   123  		})
   124  	}
   125  }