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// 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 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) {
if GOOS == "nacl" {
t.Skip("skipping on nacl")
}
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,
// no 0xffffffffffff0001; 0xffff0001 is mapped for 32-bit user space on OS X
// no 0xfffffffffff00001; 0xfff00001 is mapped for 32-bit user space sometimes on Linux
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)
for _, addr := range faultAddrs {
testSetPanicOnFault(t, uintptr(addr))
}
}
func testSetPanicOnFault(t *testing.T, addr uintptr) {
if GOOS == "nacl" {
t.Skip("nacl doesn't seem to fault on high addresses")
}
defer func() {
if err := recover(); err == nil {
t.Fatalf("did not find error in recover")
}
}()
var p *int
p = (*int)(unsafe.Pointer(addr))
println(*p)
t.Fatalf("still here - should have faulted on address %#x", addr)
}
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