Not support refer to internal symbols in the standard library anymore…

…, as the linker have changed since go1.23

g/g.go

@@ -8,23 +8,11 @@ import (
 	"unsafe"
 )
 
-// g0 the value of runtime.g0.
-//
-//go:linkname g0 runtime.g0
-var g0 struct{}
-
 // getgp returns the pointer to the current runtime.g.
 //
 //go:nosplit
 func getgp() unsafe.Pointer
 
-// getg0 returns the value of runtime.g0.
-//
-//go:nosplit
-func getg0() interface{} {
-	return packEface(getgt(), unsafe.Pointer(&g0))
-}
-
 // getgt returns the type of runtime.g.
 //
 //go:nosplit

g/g_test.go

@@ -25,15 +25,6 @@ func TestGetgp(t *testing.T) {
 	})
 }
 
-func TestGetg0(t *testing.T) {
-	runTest(t, func() {
-		g := getg0()
-		runtime.GC()
-		stackguard0 := reflect.ValueOf(g).FieldByName("stackguard0")
-		assert.Greater(t, stackguard0.Uint(), uint64(0))
-	})
-}
-
 func TestGetgt(t *testing.T) {
 	runTest(t, func() {
 		gt := getgt()
@@ -44,6 +35,15 @@ func TestGetgt(t *testing.T) {
 	})
 }
 
+func TestGetg(t *testing.T) {
+	runTest(t, func() {
+		g := packEface(getgt(), getgp())
+		runtime.GC()
+		stackguard0 := reflect.ValueOf(g).FieldByName("stackguard0")
+		assert.Greater(t, stackguard0.Uint(), uint64(0))
+	})
+}
+
 func runTest(t *testing.T, fun func()) {
 	run := false
 	wg := &sync.WaitGroup{}

gohack_test.go

@@ -1,14 +1,19 @@
 package gohack
 
 import (
+	"bytes"
+	"fmt"
 	"reflect"
 	"runtime"
+	"strconv"
 	"testing"
 	"unsafe"
 
 	"github.com/stretchr/testify/assert"
 )
 
+var goroutineSpace = []byte("goroutine ")
+
 func TestG_Goid(t *testing.T) {
 	runTest(t, func() {
 		gp := getg()
@@ -97,9 +102,22 @@ func TestOffset(t *testing.T) {
 }
 
 // curGoroutineID parse the current g's goid from caller stack.
-//
-//go:linkname curGoroutineID net/http.http2curGoroutineID
-func curGoroutineID() int64
+func curGoroutineID() int64 {
+	b := make([]byte, 64)
+	b = b[:runtime.Stack(b, false)]
+	// Parse the 4707 out of "goroutine 4707 ["
+	b = bytes.TrimPrefix(b, goroutineSpace)
+	i := bytes.IndexByte(b, ' ')
+	if i < 0 {
+		panic(fmt.Sprintf("No space found in %q", b))
+	}
+	b = b[:i]
+	n, err := strconv.ParseInt(string(b), 10, 64)
+	if err != nil {
+		panic(fmt.Sprintf("Failed to parse goroutine ID out of %q: %v", b, err))
+	}
+	return n
+}
 
 // setPanicOnFault controls the runtime's behavior when a program faults at an unexpected (non-nil) address.
 //

runtime.go

@@ -12,11 +12,6 @@ import (
 //go:linkname getgp github.com/timandy/gohack/g.getgp
 func getgp() unsafe.Pointer
 
-// getg0 returns the value of runtime.g0.
-//
-//go:linkname getg0 github.com/timandy/gohack/g.getg0
-func getg0() interface{}
-
 // getgt returns the type of runtime.g.
 //
 //go:linkname getgt github.com/timandy/gohack/g.getgt

runtime_test.go

@@ -8,10 +8,14 @@ import (
 	"sync"
 	"sync/atomic"
 	"testing"
+	"unsafe"
 
 	"github.com/stretchr/testify/assert"
 )
 
+//go:linkname packEface github.com/timandy/gohack/g.packEface
+func packEface(typ reflect.Type, p unsafe.Pointer) (i interface{})
+
 func TestGetgp(t *testing.T) {
 	gp0 := getgp()
 	runtime.GC()
@@ -25,15 +29,6 @@ func TestGetgp(t *testing.T) {
 	})
 }
 
-func TestGetg0(t *testing.T) {
-	runTest(t, func() {
-		g0 := getg0()
-		runtime.GC()
-		stackguard0 := reflect.ValueOf(g0).FieldByName("stackguard0")
-		assert.Greater(t, stackguard0.Uint(), uint64(0))
-	})
-}
-
 func TestGetgt(t *testing.T) {
 	fmt.Println("*** GOOS:", runtime.GOOS, "***")
 	fmt.Println("*** GOARCH:", runtime.GOARCH, "***")
@@ -73,6 +68,15 @@ func TestGetgt(t *testing.T) {
 	})
 }
 
+func TestGetg(t *testing.T) {
+	runTest(t, func() {
+		g0 := packEface(getgt(), getgp())
+		runtime.GC()
+		stackguard0 := reflect.ValueOf(g0).FieldByName("stackguard0")
+		assert.Greater(t, stackguard0.Uint(), uint64(0))
+	})
+}
+
 func runTest(t *testing.T, fun func()) {
 	var count int32
 	wg := &sync.WaitGroup{}