runtime: move test programs out of source code, coalesce

Now there are just three programs to compile instead of many,
and repeated tests can reuse the compilation result instead of
rebuilding it.

Combined, these changes reduce the time spent testing runtime
during all.bash on my laptop from about 60 to about 30 seconds.
(All.bash itself runs in 5½ minutes.)

For #10571.

Change-Id: Ie2c1798b847f1a635a860d11dcdab14375319ae9
Reviewed-on: https://go-review.googlesource.com/18085
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>

Author: rsc

src/runtime/crash_cgo_test.go

@@ -19,59 +19,13 @@ func TestGcSys(t *testing.T) {
 	if os.Getenv("GOGC") == "off" {
 		t.Skip("skipping test; GOGC=off in environment")
 	}
-	data := struct{ Short bool }{testing.Short()}
-	got := executeTest(t, testGCSysSource, &data)
+	got := runTestProg(t, "testprog", "GCSys")
 	want := "OK\n"
 	if got != want {
 		t.Fatalf("expected %q, but got %q", want, got)
 	}
 }
 
-const testGCSysSource = `
-package main
-
-import (
-	"fmt"
-	"runtime"
-)
-
-func main() {
-	runtime.GOMAXPROCS(1)
-	memstats := new(runtime.MemStats)
-	runtime.GC()
-	runtime.ReadMemStats(memstats)
-	sys := memstats.Sys
-
-	runtime.MemProfileRate = 0 // disable profiler
-
-	itercount := 1000000
-{{if .Short}}
-	itercount = 100000
-{{end}}
-	for i := 0; i < itercount; i++ {
-		workthegc()
-	}
-
-	// Should only be using a few MB.
-	// We allocated 100 MB or (if not short) 1 GB.
-	runtime.ReadMemStats(memstats)
-	if sys > memstats.Sys {
-		sys = 0
-	} else {
-		sys = memstats.Sys - sys
-	}
-	if sys > 16<<20 {
-		fmt.Printf("using too much memory: %d bytes\n", sys)
-		return
-	}
-	fmt.Printf("OK\n")
-}
-
-func workthegc() []byte {
-	return make([]byte, 1029)
-}
-`
-
 func TestGcDeepNesting(t *testing.T) {
 	type T [2][2][2][2][2][2][2][2][2][2]*int
 	a := new(T)

src/runtime/crash_test.go

@@ -329,48 +329,13 @@ func TestPreemptionGC(t *testing.T) {
 }
 
 func TestGCFairness(t *testing.T) {
-	output := executeTest(t, testGCFairnessSource, nil)
+	output := runTestProg(t, "testprog", "GCFairness")
 	want := "OK\n"
 	if output != want {
 		t.Fatalf("want %s, got %s\n", want, output)
 	}
 }
 
-const testGCFairnessSource = `
-package main
-
-import (
-	"fmt"
-	"os"
-	"runtime"
-	"time"
-)
-
-func main() {
-	runtime.GOMAXPROCS(1)
-	f, err := os.Open("/dev/null")
-	if os.IsNotExist(err) {
-		// This test tests what it is intended to test only if writes are fast.
-		// If there is no /dev/null, we just don't execute the test.
-		fmt.Println("OK")
-		return
-	}
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-	for i := 0; i < 2; i++ {
-		go func() {
-			for {
-				f.Write([]byte("."))
-			}
-		}()
-	}
-	time.Sleep(10 * time.Millisecond)
-	fmt.Println("OK")
-}
-`
-
 func TestPingPongHog(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping in -short mode")

src/runtime/gc_test.go

@@ -125,27 +125,14 @@ func TestStringW(t *testing.T) {
 }
 
 func TestLargeStringConcat(t *testing.T) {
-	output := executeTest(t, largeStringConcatSource, nil)
+	output := runTestProg(t, "testprog", "stringconcat")
 	want := "panic: " + strings.Repeat("0", 1<<10) + strings.Repeat("1", 1<<10) +
 		strings.Repeat("2", 1<<10) + strings.Repeat("3", 1<<10)
 	if !strings.HasPrefix(output, want) {
 		t.Fatalf("output does not start with %q:\n%s", want, output)
 	}
 }
 
-var largeStringConcatSource = `
-package main
-import "strings"
-func main() {
-	s0 := strings.Repeat("0", 1<<10)
-	s1 := strings.Repeat("1", 1<<10)
-	s2 := strings.Repeat("2", 1<<10)
-	s3 := strings.Repeat("3", 1<<10)
-	s := s0 + s1 + s2 + s3
-	panic(s)
-}
-`
-
 func TestGostringnocopy(t *testing.T) {
 	max := *runtime.Maxstring
 	b := make([]byte, max+10)

src/runtime/proc_test.go

@@ -500,7 +500,7 @@ func TestOutputDebugString(t *testing.T) {
 }
 
 func TestRaiseException(t *testing.T) {
-	o := executeTest(t, raiseExceptionSource, nil)
+	o := runTestProg(t, "testprog", "RaiseException")
 	if strings.Contains(o, "RaiseException should not return") {
 		t.Fatalf("RaiseException did not crash program: %v", o)
 	}
@@ -509,35 +509,13 @@ func TestRaiseException(t *testing.T) {
 	}
 }
 
-const raiseExceptionSource = `
-package main
-import "syscall"
-func main() {
-	const EXCEPTION_NONCONTINUABLE = 1
-	mod := syscall.MustLoadDLL("kernel32.dll")
-	proc := mod.MustFindProc("RaiseException")
-	proc.Call(0xbad, EXCEPTION_NONCONTINUABLE, 0, 0)
-	println("RaiseException should not return")
-}
-`
-
 func TestZeroDivisionException(t *testing.T) {
-	o := executeTest(t, zeroDivisionExceptionSource, nil)
+	o := runTestProg(t, "testprog", "ZeroDivisionException")
 	if !strings.Contains(o, "panic: runtime error: integer divide by zero") {
 		t.Fatalf("No stack trace: %v", o)
 	}
 }
 
-const zeroDivisionExceptionSource = `
-package main
-func main() {
-	x := 1
-	y := 0
-	z := x / y
-	println(z)
-}
-`
-
 func TestWERDialogue(t *testing.T) {
 	if os.Getenv("TESTING_WER_DIALOGUE") == "1" {
 		defer os.Exit(0)

src/runtime/string_test.go

@@ -0,0 +1,45 @@
+// Copyright 2015 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 main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func init() {
+	register("Crash", Crash)
+}
+
+func test(name string) {
+	defer func() {
+		if x := recover(); x != nil {
+			fmt.Printf(" recovered")
+		}
+		fmt.Printf(" done\n")
+	}()
+	fmt.Printf("%s:", name)
+	var s *string
+	_ = *s
+	fmt.Print("SHOULD NOT BE HERE")
+}
+
+func testInNewThread(name string) {
+	c := make(chan bool)
+	go func() {
+		runtime.LockOSThread()
+		test(name)
+		c <- true
+	}()
+	<-c
+}
+
+func Crash() {
+	runtime.LockOSThread()
+	test("main")
+	testInNewThread("new-thread")
+	testInNewThread("second-new-thread")
+	test("main-again")
+}