gcc/libgo/go/runtime/runtime_test.go
Ian Lance Taylor f8d9fa9e80 libgo, compiler: Upgrade libgo to Go 1.4, except for runtime.
This upgrades all of libgo other than the runtime package to
the Go 1.4 release.  In Go 1.4 much of the runtime was
rewritten into Go.  Merging that code will take more time and
will not change the API, so I'm putting it off for now.

There are a few runtime changes anyhow, to accomodate other
packages that rely on minor modifications to the runtime
support.

The compiler changes slightly to add a one-bit flag to each
type descriptor kind that is stored directly in an interface,
which for gccgo is currently only pointer types.  Another
one-bit flag (gcprog) is reserved because it is used by the gc
compiler, but gccgo does not currently use it.

There is another error check in the compiler since I ran
across it during testing.

gotools/:
	* Makefile.am (go_cmd_go_files): Sort entries.  Add generate.go.
	* Makefile.in: Rebuild.

From-SVN: r219627
2015-01-15 00:27:56 +00:00

253 lines
5.8 KiB
Go

// Copyright 2012 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 runtime_test
import (
"io"
// "io/ioutil"
// "os"
// "os/exec"
. "runtime"
"runtime/debug"
// "strconv"
// "strings"
"testing"
"unsafe"
)
var errf error
func errfn() error {
return errf
}
func errfn1() error {
return io.EOF
}
func BenchmarkIfaceCmp100(b *testing.B) {
for i := 0; i < b.N; i++ {
for j := 0; j < 100; j++ {
if errfn() == io.EOF {
b.Fatal("bad comparison")
}
}
}
}
func BenchmarkIfaceCmpNil100(b *testing.B) {
for i := 0; i < b.N; i++ {
for j := 0; j < 100; j++ {
if errfn1() == nil {
b.Fatal("bad comparison")
}
}
}
}
func BenchmarkDefer(b *testing.B) {
for i := 0; i < b.N; i++ {
defer1()
}
}
func defer1() {
defer func(x, y, z int) {
if recover() != nil || x != 1 || y != 2 || z != 3 {
panic("bad recover")
}
}(1, 2, 3)
return
}
func BenchmarkDefer10(b *testing.B) {
for i := 0; i < b.N/10; i++ {
defer2()
}
}
func defer2() {
for i := 0; i < 10; i++ {
defer func(x, y, z int) {
if recover() != nil || x != 1 || y != 2 || z != 3 {
panic("bad recover")
}
}(1, 2, 3)
}
}
func BenchmarkDeferMany(b *testing.B) {
for i := 0; i < b.N; i++ {
defer func(x, y, z int) {
if recover() != nil || x != 1 || y != 2 || z != 3 {
panic("bad recover")
}
}(1, 2, 3)
}
}
/* The go tool is not present in gccgo.
// The profiling signal handler needs to know whether it is executing runtime.gogo.
// The constant RuntimeGogoBytes in arch_*.h gives the size of the function;
// we don't have a way to obtain it from the linker (perhaps someday).
// Test that the constant matches the size determined by 'go tool nm -S'.
// The value reported will include the padding between runtime.gogo and the
// next function in memory. That's fine.
func TestRuntimeGogoBytes(t *testing.T) {
switch GOOS {
case "android", "nacl":
t.Skipf("skipping on %s", GOOS)
}
dir, err := ioutil.TempDir("", "go-build")
if err != nil {
t.Fatalf("failed to create temp directory: %v", err)
}
defer os.RemoveAll(dir)
out, err := exec.Command("go", "build", "-o", dir+"/hello", "../../test/helloworld.go").CombinedOutput()
if err != nil {
t.Fatalf("building hello world: %v\n%s", err, out)
}
out, err = exec.Command("go", "tool", "nm", "-size", dir+"/hello").CombinedOutput()
if err != nil {
t.Fatalf("go tool nm: %v\n%s", err, out)
}
for _, line := range strings.Split(string(out), "\n") {
f := strings.Fields(line)
if len(f) == 4 && f[3] == "runtime.gogo" {
size, _ := strconv.Atoi(f[1])
if GogoBytes() != int32(size) {
t.Fatalf("RuntimeGogoBytes = %d, should be %d", GogoBytes(), size)
}
return
}
}
t.Fatalf("go tool nm did not report size for runtime.gogo")
}
*/
// golang.org/issue/7063
func TestStopCPUProfilingWithProfilerOff(t *testing.T) {
SetCPUProfileRate(0)
}
// Addresses to test for faulting behavior.
// This is less a test of SetPanicOnFault and more a check that
// the operating system and the runtime can process these faults
// correctly. That is, we're indirectly testing that without SetPanicOnFault
// these would manage to turn into ordinary crashes.
// Note that these are truncated on 32-bit systems, so the bottom 32 bits
// of the larger addresses must themselves be invalid addresses.
// We might get unlucky and the OS might have mapped one of these
// addresses, but probably not: they're all in the first page, very high
// adderesses that normally an OS would reserve for itself, or malformed
// addresses. Even so, we might have to remove one or two on different
// systems. We will see.
var faultAddrs = []uint64{
// low addresses
0,
1,
0xfff,
// high (kernel) addresses
// or else malformed.
0xffffffffffffffff,
0xfffffffffffff001,
0xffffffffffff0001,
0xfffffffffff00001,
0xffffffffff000001,
0xfffffffff0000001,
0xffffffff00000001,
0xfffffff000000001,
0xffffff0000000001,
0xfffff00000000001,
0xffff000000000001,
0xfff0000000000001,
0xff00000000000001,
0xf000000000000001,
0x8000000000000001,
}
func TestSetPanicOnFault(t *testing.T) {
// This currently results in a fault in the signal trampoline on
// dragonfly/386 - see issue 7421.
if GOOS == "dragonfly" && GOARCH == "386" {
t.Skip("skipping test on dragonfly/386")
}
old := debug.SetPanicOnFault(true)
defer debug.SetPanicOnFault(old)
nfault := 0
for _, addr := range faultAddrs {
testSetPanicOnFault(t, uintptr(addr), &nfault)
}
if nfault == 0 {
t.Fatalf("none of the addresses faulted")
}
}
func testSetPanicOnFault(t *testing.T, addr uintptr, nfault *int) {
if GOOS == "nacl" {
t.Skip("nacl doesn't seem to fault on high addresses")
}
defer func() {
if err := recover(); err != nil {
*nfault++
}
}()
// The read should fault, except that sometimes we hit
// addresses that have had C or kernel pages mapped there
// readable by user code. So just log the content.
// If no addresses fault, we'll fail the test.
v := *(*byte)(unsafe.Pointer(addr))
t.Logf("addr %#x: %#x\n", addr, v)
}
func eqstring_generic(s1, s2 string) bool {
if len(s1) != len(s2) {
return false
}
// optimization in assembly versions:
// if s1.str == s2.str { return true }
for i := 0; i < len(s1); i++ {
if s1[i] != s2[i] {
return false
}
}
return true
}
func TestEqString(t *testing.T) {
// This isn't really an exhaustive test of eqstring, it's
// just a convenient way of documenting (via eqstring_generic)
// what eqstring does.
s := []string{
"",
"a",
"c",
"aaa",
"ccc",
"cccc"[:3], // same contents, different string
"1234567890",
}
for _, s1 := range s {
for _, s2 := range s {
x := s1 == s2
y := eqstring_generic(s1, s2)
if x != y {
t.Errorf(`eqstring("%s","%s") = %t, want %t`, s1, s2, x, y)
}
}
}
}