1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
// Copyright 2021 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 ssa_test
import (
"bufio"
"bytes"
"flag"
"runtime"
"sort"
// "flag"
"fmt"
"internal/testenv"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"reflect"
"regexp"
"strconv"
"testing"
)
// Matches lines in genssa output that are marked "isstmt", and the parenthesized plus-prefixed line number is a submatch
var asmLine *regexp.Regexp = regexp.MustCompile(`^\s[vb][0-9]+\s+[0-9]+\s\(\+([0-9]+)\)`)
// this matches e.g. ` v123456789 000007 (+9876654310) MOVUPS X15, ""..autotmp_2-32(SP)`
// Matches lines in genssa output that describe an inlined file (on a Unix filesystem). Note it expects an unadventurous choice of basename.
var inlineLine *regexp.Regexp = regexp.MustCompile(`^#\s/.*/[-a-zA-Z0-9_]+\.go:([0-9]+)`)
// this matches e.g. # /pa/inline-dumpxxxx.go:6
var testGoArchFlag = flag.String("arch", "", "run test for specified architecture")
func testGoArch() string {
if *testGoArchFlag == "" {
return runtime.GOARCH
}
return *testGoArchFlag
}
func TestDebugLines(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skip("Windows lacks $HOME which complicates workaround for 'missing $GOPATH'") // $HOME needed to work around #43938
}
// This test is potentially fragile, the goal is that debugging should step properly through "sayhi"
// If the blocks are reordered in a way that changes the statement order but execution flows correctly,
// then rearrange the expected numbers. Register abi and not-register-abi also have different sequences,
// at least for now.
switch testGoArch() {
case "arm64", "amd64": // register ABI
testDebugLines(t, "sayhi.go", "sayhi", []int{8, 9, 10, 11})
case "arm", "386": // probably not register ABI for a while
testDebugLines(t, "sayhi.go", "sayhi", []int{9, 10, 11})
default: // expect ppc64le and riscv will pick up register ABI soonish, not sure about others
t.Skip("skipped for many architectures, also changes w/ register ABI")
}
}
func TestInlineLines(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skip("Windows lacks $HOME which complicates workaround for 'missing $GOPATH'") // $HOME needed to work around #43938
}
if runtime.GOARCH != "amd64" && *testGoArchFlag == "" {
// As of september 2021, works for everything except mips64, but still potentially fragile
t.Skip("only runs for amd64 unless -arch explicitly supplied")
}
want := [][]int{{3}, {4, 10}, {4, 10, 16}, {4, 10}, {4, 11, 16}, {4, 11}, {4}, {5, 10}, {5, 10, 16}, {5, 10}, {5, 11, 16}, {5, 11}, {5}}
testInlineStack(t, "inline-dump.go", "f", want)
}
func compileAndDump(t *testing.T, file, function, moreGCFlags string) []byte {
testenv.MustHaveGoBuild(t)
tmpdir, err := ioutil.TempDir("", "debug_lines_test")
if err != nil {
panic(fmt.Sprintf("Problem creating TempDir, error %v", err))
}
if testing.Verbose() {
fmt.Printf("Preserving temporary directory %s\n", tmpdir)
} else {
defer os.RemoveAll(tmpdir)
}
source, err := filepath.Abs(filepath.Join("testdata", file))
if err != nil {
panic(fmt.Sprintf("Could not get abspath of testdata directory and file, %v", err))
}
cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "foo.o", "-gcflags=-d=ssa/genssa/dump="+function+" "+moreGCFlags, source)
cmd.Dir = tmpdir
cmd.Env = replaceEnv(cmd.Env, "GOSSADIR", tmpdir)
cmd.Env = replaceEnv(cmd.Env, "HOME", os.Getenv("HOME")) // workaround for #43938
testGoos := "linux" // default to linux
if testGoArch() == "wasm" {
testGoos = "js"
}
cmd.Env = replaceEnv(cmd.Env, "GOOS", testGoos)
cmd.Env = replaceEnv(cmd.Env, "GOARCH", testGoArch())
if testing.Verbose() {
fmt.Printf("About to run %s\n", asCommandLine("", cmd))
}
var stdout, stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
t.Fatalf("error running cmd %s: %v\nstdout:\n%sstderr:\n%s\n", asCommandLine("", cmd), err, stdout.String(), stderr.String())
}
if s := stderr.String(); s != "" {
t.Fatalf("Wanted empty stderr, instead got:\n%s\n", s)
}
dumpFile := filepath.Join(tmpdir, function+"_01__genssa.dump")
dumpBytes, err := os.ReadFile(dumpFile)
if err != nil {
t.Fatalf("Could not read dump file %s, err=%v", dumpFile, err)
}
return dumpBytes
}
func sortInlineStacks(x [][]int) {
sort.Slice(x, func(i, j int) bool {
if len(x[i]) != len(x[j]) {
return len(x[i]) < len(x[j])
}
for k := range x[i] {
if x[i][k] != x[j][k] {
return x[i][k] < x[j][k]
}
}
return false
})
}
// testInlineStack ensures that inlining is described properly in the comments in the dump file
func testInlineStack(t *testing.T, file, function string, wantStacks [][]int) {
// this is an inlining reporting test, not an optimization test. -N makes it less fragile
dumpBytes := compileAndDump(t, file, function, "-N")
dump := bufio.NewScanner(bytes.NewReader(dumpBytes))
dumpLineNum := 0
var gotStmts []int
var gotStacks [][]int
for dump.Scan() {
line := dump.Text()
dumpLineNum++
matches := inlineLine.FindStringSubmatch(line)
if len(matches) == 2 {
stmt, err := strconv.ParseInt(matches[1], 10, 32)
if err != nil {
t.Fatalf("Expected to parse a line number but saw %s instead on dump line #%d, error %v", matches[1], dumpLineNum, err)
}
if testing.Verbose() {
fmt.Printf("Saw stmt# %d for submatch '%s' on dump line #%d = '%s'\n", stmt, matches[1], dumpLineNum, line)
}
gotStmts = append(gotStmts, int(stmt))
} else if len(gotStmts) > 0 {
gotStacks = append(gotStacks, gotStmts)
gotStmts = nil
}
}
if len(gotStmts) > 0 {
gotStacks = append(gotStacks, gotStmts)
gotStmts = nil
}
sortInlineStacks(gotStacks)
sortInlineStacks(wantStacks)
if !reflect.DeepEqual(wantStacks, gotStacks) {
t.Errorf("wanted inlines %+v but got %+v", wantStacks, gotStacks)
}
}
// testDebugLines compiles testdata/<file> with flags -N -l and -d=ssa/genssa/dump=<function>
// then verifies that the statement-marked lines in that file are the same as those in wantStmts
// These files must all be short because this is super-fragile.
// "go build" is run in a temporary directory that is normally deleted, unless -test.v
func testDebugLines(t *testing.T, file, function string, wantStmts []int) {
dumpBytes := compileAndDump(t, file, function, "-N -l")
dump := bufio.NewScanner(bytes.NewReader(dumpBytes))
var gotStmts []int
dumpLineNum := 0
for dump.Scan() {
line := dump.Text()
dumpLineNum++
matches := asmLine.FindStringSubmatch(line)
if len(matches) == 2 {
stmt, err := strconv.ParseInt(matches[1], 10, 32)
if err != nil {
t.Fatalf("Expected to parse a line number but saw %s instead on dump line #%d, error %v", matches[1], dumpLineNum, err)
}
if testing.Verbose() {
fmt.Printf("Saw stmt# %d for submatch '%s' on dump line #%d = '%s'\n", stmt, matches[1], dumpLineNum, line)
}
gotStmts = append(gotStmts, int(stmt))
}
}
if !reflect.DeepEqual(wantStmts, gotStmts) {
t.Errorf("wanted stmts %v but got %v", wantStmts, gotStmts)
}
}
|
