libgo: update to Go 1.14.6 release

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/243317

3 files changed, 132 insertions, 77 deletions

diff --git a/libgo/go/testing/benchmark.go b/libgo/go/testing/benchmark.go
index 88ba0f0..5276600 100644
--- a/libgo/go/testing/benchmark.go
+++ b/libgo/go/testing/benchmark.go
@@ -526,6 +526,7 @@ func runBenchmarks(importPath string, matchString func(pat, str string) (bool, e
 			name:   "Main",
 			w:      os.Stdout,
 			chatty: *chatty,
+			bench:  true,
 		},
 		importPath: importPath,
 		benchFunc: func(b *B) {
@@ -559,6 +560,7 @@ func (ctx *benchContext) processBench(b *B) {
 						name:   b.name,
 						w:      b.w,
 						chatty: b.chatty,
+						bench:  true,
 					},
 					benchFunc: b.benchFunc,
 					benchTime: b.benchTime,
@@ -624,6 +626,7 @@ func (b *B) Run(name string, f func(b *B)) bool {
 			creator: pc[:n],
 			w:       b.w,
 			chatty:  b.chatty,
+			bench:   true,
 		},
 		importPath: b.importPath,
 		benchFunc:  f,
diff --git a/libgo/go/testing/sub_test.go b/libgo/go/testing/sub_test.go
index 95f8220..8eb0084 100644
--- a/libgo/go/testing/sub_test.go
+++ b/libgo/go/testing/sub_test.go
@@ -438,8 +438,6 @@ func TestTRun(t *T) {
 	}, {
 		// A chatty test should always log with fmt.Print, even if the
 		// parent test has completed.
-		// TODO(deklerk) Capture the log of fmt.Print and assert that the
-		// subtest message is not lost.
 		desc:   "log in finished sub test with chatty",
 		ok:     false,
 		chatty: true,
@@ -477,35 +475,37 @@ func TestTRun(t *T) {
 		},
 	}}
 	for _, tc := range testCases {
-		ctx := newTestContext(tc.maxPar, newMatcher(regexp.MatchString, "", ""))
-		buf := &bytes.Buffer{}
-		root := &T{
-			common: common{
-				signal: make(chan bool),
-				name:   "Test",
-				w:      buf,
-				chatty: tc.chatty,
-			},
-			context: ctx,
-		}
-		ok := root.Run(tc.desc, tc.f)
-		ctx.release()
+		t.Run(tc.desc, func(t *T) {
+			ctx := newTestContext(tc.maxPar, newMatcher(regexp.MatchString, "", ""))
+			buf := &bytes.Buffer{}
+			root := &T{
+				common: common{
+					signal: make(chan bool),
+					name:   "Test",
+					w:      buf,
+					chatty: tc.chatty,
+				},
+				context: ctx,
+			}
+			ok := root.Run(tc.desc, tc.f)
+			ctx.release()
 
-		if ok != tc.ok {
-			t.Errorf("%s:ok: got %v; want %v", tc.desc, ok, tc.ok)
-		}
-		if ok != !root.Failed() {
-			t.Errorf("%s:root failed: got %v; want %v", tc.desc, !ok, root.Failed())
-		}
-		if ctx.running != 0 || ctx.numWaiting != 0 {
-			t.Errorf("%s:running and waiting non-zero: got %d and %d", tc.desc, ctx.running, ctx.numWaiting)
-		}
-		got := strings.TrimSpace(buf.String())
-		want := strings.TrimSpace(tc.output)
-		re := makeRegexp(want)
-		if ok, err := regexp.MatchString(re, got); !ok || err != nil {
-			t.Errorf("%s:output:\ngot:\n%s\nwant:\n%s", tc.desc, got, want)
-		}
+			if ok != tc.ok {
+				t.Errorf("%s:ok: got %v; want %v", tc.desc, ok, tc.ok)
+			}
+			if ok != !root.Failed() {
+				t.Errorf("%s:root failed: got %v; want %v", tc.desc, !ok, root.Failed())
+			}
+			if ctx.running != 0 || ctx.numWaiting != 0 {
+				t.Errorf("%s:running and waiting non-zero: got %d and %d", tc.desc, ctx.running, ctx.numWaiting)
+			}
+			got := strings.TrimSpace(buf.String())
+			want := strings.TrimSpace(tc.output)
+			re := makeRegexp(want)
+			if ok, err := regexp.MatchString(re, got); !ok || err != nil {
+				t.Errorf("%s:output:\ngot:\n%s\nwant:\n%s", tc.desc, got, want)
+			}
+		})
 	}
 }
 
@@ -655,43 +655,45 @@ func TestBRun(t *T) {
 		},
 	}}
 	for _, tc := range testCases {
-		var ok bool
-		buf := &bytes.Buffer{}
-		// This is almost like the Benchmark function, except that we override
-		// the benchtime and catch the failure result of the subbenchmark.
-		root := &B{
-			common: common{
-				signal: make(chan bool),
-				name:   "root",
-				w:      buf,
-				chatty: tc.chatty,
-			},
-			benchFunc: func(b *B) { ok = b.Run("test", tc.f) }, // Use Run to catch failure.
-			benchTime: benchTimeFlag{d: 1 * time.Microsecond},
-		}
-		root.runN(1)
-		if ok != !tc.failed {
-			t.Errorf("%s:ok: got %v; want %v", tc.desc, ok, !tc.failed)
-		}
-		if !ok != root.Failed() {
-			t.Errorf("%s:root failed: got %v; want %v", tc.desc, !ok, root.Failed())
-		}
-		// All tests are run as subtests
-		if root.result.N != 1 {
-			t.Errorf("%s: N for parent benchmark was %d; want 1", tc.desc, root.result.N)
-		}
-		got := strings.TrimSpace(buf.String())
-		want := strings.TrimSpace(tc.output)
-		re := makeRegexp(want)
-		if ok, err := regexp.MatchString(re, got); !ok || err != nil {
-			t.Errorf("%s:output:\ngot:\n%s\nwant:\n%s", tc.desc, got, want)
-		}
+		t.Run(tc.desc, func(t *T) {
+			var ok bool
+			buf := &bytes.Buffer{}
+			// This is almost like the Benchmark function, except that we override
+			// the benchtime and catch the failure result of the subbenchmark.
+			root := &B{
+				common: common{
+					signal: make(chan bool),
+					name:   "root",
+					w:      buf,
+					chatty: tc.chatty,
+				},
+				benchFunc: func(b *B) { ok = b.Run("test", tc.f) }, // Use Run to catch failure.
+				benchTime: benchTimeFlag{d: 1 * time.Microsecond},
+			}
+			root.runN(1)
+			if ok != !tc.failed {
+				t.Errorf("%s:ok: got %v; want %v", tc.desc, ok, !tc.failed)
+			}
+			if !ok != root.Failed() {
+				t.Errorf("%s:root failed: got %v; want %v", tc.desc, !ok, root.Failed())
+			}
+			// All tests are run as subtests
+			if root.result.N != 1 {
+				t.Errorf("%s: N for parent benchmark was %d; want 1", tc.desc, root.result.N)
+			}
+			got := strings.TrimSpace(buf.String())
+			want := strings.TrimSpace(tc.output)
+			re := makeRegexp(want)
+			if ok, err := regexp.MatchString(re, got); !ok || err != nil {
+				t.Errorf("%s:output:\ngot:\n%s\nwant:\n%s", tc.desc, got, want)
+			}
+		})
 	}
 }
 
 func makeRegexp(s string) string {
 	s = regexp.QuoteMeta(s)
-	s = strings.ReplaceAll(s, ":NNN:", `:\d\d\d:`)
+	s = strings.ReplaceAll(s, ":NNN:", `:\d\d\d\d?:`)
 	s = strings.ReplaceAll(s, "N\\.NNs", `\d*\.\d*s`)
 	return s
 }
diff --git a/libgo/go/testing/testing.go b/libgo/go/testing/testing.go
index 758af74..9f47eb8 100644
--- a/libgo/go/testing/testing.go
+++ b/libgo/go/testing/testing.go
@@ -320,6 +320,7 @@ var (
 	cpuListStr           *string
 	parallel             *int
 	testlog              *string
+	printer              *testPrinter
 
 	haveExamples bool // are there examples?
 
@@ -329,6 +330,48 @@ var (
 	numFailed uint32 // number of test failures
 )
 
+type testPrinter struct {
+	chatty bool
+
+	lastNameMu sync.Mutex // guards lastName
+	lastName   string     // last printed test name in chatty mode
+}
+
+func newTestPrinter(chatty bool) *testPrinter {
+	return &testPrinter{
+		chatty: chatty,
+	}
+}
+
+func (p *testPrinter) Print(testName, out string) {
+	p.Fprint(os.Stdout, testName, out)
+}
+
+func (p *testPrinter) Fprint(w io.Writer, testName, out string) {
+	p.lastNameMu.Lock()
+	defer p.lastNameMu.Unlock()
+
+	if !p.chatty ||
+		strings.HasPrefix(out, "--- PASS") ||
+		strings.HasPrefix(out, "--- FAIL") ||
+		strings.HasPrefix(out, "=== CONT") ||
+		strings.HasPrefix(out, "=== RUN") {
+		p.lastName = testName
+		fmt.Fprint(w, out)
+		return
+	}
+
+	if p.lastName == "" {
+		p.lastName = testName
+	} else if p.lastName != testName {
+		// Always printed as-is, with 0 decoration or indentation. So, we skip
+		// printing to w.
+		fmt.Printf("=== CONT  %s\n", testName)
+		p.lastName = testName
+	}
+	fmt.Fprint(w, out)
+}
+
 // The maximum number of stack frames to go through when skipping helper functions for
 // the purpose of decorating log messages.
 const maxStackLen = 50
@@ -347,10 +390,11 @@ type common struct {
 	cleanup func()              // optional function to be called at the end of the test
 
 	chatty     bool   // A copy of the chatty flag.
+	bench      bool   // Whether the current test is a benchmark.
 	finished   bool   // Test function has completed.
-	hasSub     int32  // written atomically
-	raceErrors int    // number of races detected during test
-	runner     string // function name of tRunner running the test
+	hasSub     int32  // Written atomically.
+	raceErrors int    // Number of races detected during test.
+	runner     string // Function name of tRunner running the test.
 
 	parent   *common
 	level    int       // Nesting depth of test or benchmark.
@@ -480,9 +524,6 @@ func (c *common) decorate(s string, skip int) string {
 	buf := new(strings.Builder)
 	// Every line is indented at least 4 spaces.
 	buf.WriteString("    ")
-	if c.chatty {
-		fmt.Fprintf(buf, "%s: ", c.name)
-	}
 	fmt.Fprintf(buf, "%s:%d: ", file, line)
 	lines := strings.Split(s, "\n")
 	if l := len(lines); l > 1 && lines[l-1] == "" {
@@ -501,12 +542,12 @@ func (c *common) decorate(s string, skip int) string {
 
 // flushToParent writes c.output to the parent after first writing the header
 // with the given format and arguments.
-func (c *common) flushToParent(format string, args ...interface{}) {
+func (c *common) flushToParent(testName, format string, args ...interface{}) {
 	p := c.parent
 	p.mu.Lock()
 	defer p.mu.Unlock()
 
-	fmt.Fprintf(p.w, format, args...)
+	printer.Fprint(p.w, testName, fmt.Sprintf(format, args...))
 
 	c.mu.Lock()
 	defer c.mu.Unlock()
@@ -680,7 +721,14 @@ func (c *common) logDepth(s string, depth int) {
 		panic("Log in goroutine after " + c.name + " has completed")
 	} else {
 		if c.chatty {
-			fmt.Print(c.decorate(s, depth+1))
+			if c.bench {
+				// Benchmarks don't print === CONT, so we should skip the test
+				// printer and just print straight to stdout.
+				fmt.Print(c.decorate(s, depth+1))
+			} else {
+				printer.Print(c.name, c.decorate(s, depth+1))
+			}
+
 			return
 		}
 		c.output = append(c.output, c.decorate(s, depth+1)...)
@@ -909,7 +957,7 @@ func (t *T) Parallel() {
 		for ; root.parent != nil; root = root.parent {
 		}
 		root.mu.Lock()
-		fmt.Fprintf(root.w, "=== CONT  %s\n", t.name)
+		printer.Fprint(root.w, t.name, fmt.Sprintf("=== CONT  %s\n", t.name))
 		root.mu.Unlock()
 	}
 
@@ -968,7 +1016,7 @@ func tRunner(t *T, fn func(t *T)) {
 				root.duration += time.Since(root.start)
 				d := root.duration
 				root.mu.Unlock()
-				root.flushToParent("--- FAIL: %s (%s)\n", root.name, fmtDuration(d))
+				root.flushToParent(root.name, "--- FAIL: %s (%s)\n", root.name, fmtDuration(d))
 				if r := root.parent.runCleanup(recoverAndReturnPanic); r != nil {
 					fmt.Fprintf(root.parent.w, "cleanup panicked with %v", r)
 				}
@@ -1067,7 +1115,7 @@ func (t *T) Run(name string, f func(t *T)) bool {
 		for ; root.parent != nil; root = root.parent {
 		}
 		root.mu.Lock()
-		fmt.Fprintf(root.w, "=== RUN   %s\n", t.name)
+		printer.Fprint(root.w, t.name, fmt.Sprintf("=== RUN   %s\n", t.name))
 		root.mu.Unlock()
 	}
 	// Instead of reducing the running count of this test before calling the
@@ -1215,6 +1263,8 @@ func (m *M) Run() int {
 		flag.Parse()
 	}
 
+	printer = newTestPrinter(Verbose())
+
 	if *parallel < 1 {
 		fmt.Fprintln(os.Stderr, "testing: -parallel can only be given a positive integer")
 		flag.Usage()
@@ -1254,12 +1304,12 @@ func (t *T) report() {
 	dstr := fmtDuration(t.duration)
 	format := "--- %s: %s (%s)\n"
 	if t.Failed() {
-		t.flushToParent(format, "FAIL", t.name, dstr)
+		t.flushToParent(t.name, format, "FAIL", t.name, dstr)
 	} else if t.chatty {
 		if t.Skipped() {
-			t.flushToParent(format, "SKIP", t.name, dstr)
+			t.flushToParent(t.name, format, "SKIP", t.name, dstr)
 		} else {
-			t.flushToParent(format, "PASS", t.name, dstr)
+			t.flushToParent(t.name, format, "PASS", t.name, dstr)
 		}
 	}
 }