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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.
-
- // +build go1.10
-
- 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"
- )
-
- 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")
- }
- pclinetestBinary = filepath.Join(pclineTempDir, "pclinetest")
- command := fmt.Sprintf("go tool compile -o %s.6 testdata/pclinetest.go && 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 TestPCAndLine(t *testing.T) {
- t.Skip("This stopped working in Go 1.12")
-
- // TODO(jba): go1.9: use subtests
- if !dotest(false) {
- return
- }
- defer endtest()
-
- data, err := getData(pclinetestBinary)
- if err != nil {
- t.Fatal(err)
- }
-
- testLineToBreakpointPCs(t, data)
- testPCToLine(t, data)
- }
-
- func testPCToLine(t *testing.T, data *Data) {
- entry, err := data.LookupFunction("main.main")
- if err != nil {
- t.Fatal(err)
- }
- pc, ok := entry.Val(AttrLowpc).(uint64)
- if !ok {
- t.Fatal(`DWARF data for function "main" has no PC`)
- }
- for _, tt := range []struct {
- offset, want uint64
- }{
- {0, 19},
- {19, 19},
- {33, 20},
- {97, 22},
- {165, 23},
- } {
- file, line, err := data.PCToLine(pc + tt.offset)
- if err != nil {
- t.Fatal(err)
- }
- if !strings.HasSuffix(file, "/pclinetest.go") {
- t.Errorf("got %s; want %s", file, "/pclinetest.go")
- }
- if line != tt.want {
- t.Errorf("line for offset %d: got %d; want %d", tt.offset, line, tt.want)
- }
- }
- }
-
- func testLineToBreakpointPCs(t *testing.T, data *Data) {
- for _, tt := range []struct {
- line uint64
- want bool
- }{
- {18, false},
- {19, true},
- {20, true},
- {21, false},
- {22, true},
- {23, true},
- {24, false},
- } {
- pcs, err := data.LineToBreakpointPCs("pclinetest.go", uint64(tt.line))
- if err != nil {
- t.Fatal(err)
- }
- if got := len(pcs) > 0; got != tt.want {
- t.Errorf("line %d: got pcs=%t, want pcs=%t", tt.line, got, tt.want)
-
- }
- }
- }
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