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- // Copyright 2018 Google Inc. All Rights Reserved.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package dwarf_test
-
- // Stripped-down, simplified version of ../../gosym/pclntab_test.go
-
- import (
- "fmt"
- "io/ioutil"
- "os"
- "os/exec"
- "path/filepath"
- "runtime"
- "strings"
- "testing"
-
- . "cloud.google.com/go/cmd/go-cloud-debug-agent/internal/debug/dwarf"
- "cloud.google.com/go/cmd/go-cloud-debug-agent/internal/debug/elf"
- "cloud.google.com/go/cmd/go-cloud-debug-agent/internal/debug/macho"
- )
-
- var (
- pclineTempDir string
- pclinetestBinary string
- )
-
- func dotest(self bool) bool {
- // For now, only works on amd64 platforms.
- if runtime.GOARCH != "amd64" {
- return false
- }
- // Self test reads test binary; only works on Linux or Mac.
- if self {
- if runtime.GOOS != "linux" && runtime.GOOS != "darwin" {
- return false
- }
- }
- // Command below expects "sh", so Unix.
- if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
- return false
- }
- if pclinetestBinary != "" {
- return true
- }
- var err error
- pclineTempDir, err = ioutil.TempDir("", "pclinetest")
- if err != nil {
- panic(err)
- }
- if strings.Contains(pclineTempDir, " ") {
- panic("unexpected space in tempdir")
- }
- // This command builds pclinetest from ../../gosym/pclinetest.asm;
- // the resulting binary looks like it was built from pclinetest.s,
- // but we have renamed it to keep it away from the go tool.
- pclinetestBinary = filepath.Join(pclineTempDir, "pclinetest")
- command := fmt.Sprintf("go tool asm -o %s.6 ../gosym/pclinetest.asm && go tool link -H %s -E main -o %s %s.6",
- pclinetestBinary, runtime.GOOS, pclinetestBinary, pclinetestBinary)
- cmd := exec.Command("sh", "-c", command)
- cmd.Stdout = os.Stdout
- cmd.Stderr = os.Stderr
- if err := cmd.Run(); err != nil {
- panic(err)
- }
- return true
- }
-
- func endtest() {
- if pclineTempDir != "" {
- os.RemoveAll(pclineTempDir)
- pclineTempDir = ""
- pclinetestBinary = ""
- }
- }
-
- func getData(file string) (*Data, error) {
- switch runtime.GOOS {
- case "linux":
- f, err := elf.Open(file)
- if err != nil {
- return nil, err
- }
- dwarf, err := f.DWARF()
- if err != nil {
- return nil, err
- }
- f.Close()
- return dwarf, nil
- case "darwin":
- f, err := macho.Open(file)
- if err != nil {
- return nil, err
- }
- dwarf, err := f.DWARF()
- if err != nil {
- return nil, err
- }
- f.Close()
- return dwarf, nil
- }
- panic("unimplemented DWARF for GOOS=" + runtime.GOOS)
- }
-
- func TestPCToLine(t *testing.T) {
- t.Skip("linker complains while building test binary")
-
- if !dotest(false) {
- return
- }
- defer endtest()
-
- data, err := getData(pclinetestBinary)
- if err != nil {
- t.Fatal(err)
- }
-
- // Test PCToLine.
- entry, err := data.LookupFunction("linefrompc")
- if err != nil {
- t.Fatal(err)
- }
- pc, ok := entry.Val(AttrLowpc).(uint64)
- if !ok {
- t.Fatal(`DWARF data for function "linefrompc" has no PC`)
- }
- for _, tt := range []struct {
- offset, want uint64
- }{
- {0, 2},
- {1, 3},
- {2, 4},
- {3, 4},
- {4, 5},
- {6, 5},
- {7, 6},
- {11, 6},
- {12, 7},
- {19, 7},
- {20, 8},
- {32, 8},
- {33, 9},
- {53, 9},
- {54, 10},
- } {
- file, line, err := data.PCToLine(pc + tt.offset)
- if err != nil {
- t.Fatal(err)
- }
- if !strings.HasSuffix(file, "/pclinetest.asm") {
- t.Errorf("got %s; want %s", file, ".../pclinetest.asm")
- }
- if line != tt.want {
- t.Errorf("line for offset %d: got %d; want %d", tt.offset, line, tt.want)
- }
- }
- }
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