Adding upstream version 0.0~git20250520.a1d9079+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

internal/mobileinit/ctx_android.go

@@ -0,0 +1,124 @@
+// 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 mobileinit
+
+/*
+#include <jni.h>
+#include <stdlib.h>
+
+static char* lockJNI(JavaVM *vm, uintptr_t* envp, int* attachedp) {
+	JNIEnv* env;
+
+	if (vm == NULL) {
+		return "no current JVM";
+	}
+
+	*attachedp = 0;
+	switch ((*vm)->GetEnv(vm, (void**)&env, JNI_VERSION_1_6)) {
+	case JNI_OK:
+		break;
+	case JNI_EDETACHED:
+		if ((*vm)->AttachCurrentThread(vm, &env, 0) != 0) {
+			return "cannot attach to JVM";
+		}
+		*attachedp = 1;
+		break;
+	case JNI_EVERSION:
+		return "bad JNI version";
+	default:
+		return "unknown JNI error from GetEnv";
+	}
+
+	*envp = (uintptr_t)env;
+	return NULL;
+}
+
+static char* checkException(uintptr_t jnienv) {
+	jthrowable exc;
+	JNIEnv* env = (JNIEnv*)jnienv;
+
+	if (!(*env)->ExceptionCheck(env)) {
+		return NULL;
+	}
+
+	exc = (*env)->ExceptionOccurred(env);
+	(*env)->ExceptionClear(env);
+
+	jclass clazz = (*env)->FindClass(env, "java/lang/Throwable");
+	jmethodID toString = (*env)->GetMethodID(env, clazz, "toString", "()Ljava/lang/String;");
+	jobject msgStr = (*env)->CallObjectMethod(env, exc, toString);
+	return (char*)(*env)->GetStringUTFChars(env, msgStr, 0);
+}
+
+static void unlockJNI(JavaVM *vm) {
+	(*vm)->DetachCurrentThread(vm);
+}
+*/
+import "C"
+
+import (
+	"errors"
+	"runtime"
+	"unsafe"
+)
+
+// currentVM is stored to initialize other cgo packages.
+//
+// As all the Go packages in a program form a single shared library,
+// there can only be one JNI_OnLoad function for initialization. In
+// OpenJDK there is JNI_GetCreatedJavaVMs, but this is not available
+// on android.
+var currentVM *C.JavaVM
+
+// currentCtx is Android's android.context.Context. May be NULL.
+var currentCtx C.jobject
+
+// SetCurrentContext populates the global Context object with the specified
+// current JavaVM instance (vm) and android.context.Context object (ctx).
+// The android.context.Context object must be a global reference.
+func SetCurrentContext(vm unsafe.Pointer, ctx uintptr) {
+	currentVM = (*C.JavaVM)(vm)
+	currentCtx = (C.jobject)(ctx)
+}
+
+// RunOnJVM runs fn on a new goroutine locked to an OS thread with a JNIEnv.
+//
+// RunOnJVM blocks until the call to fn is complete. Any Java
+// exception or failure to attach to the JVM is returned as an error.
+//
+// The function fn takes vm, the current JavaVM*,
+// env, the current JNIEnv*, and
+// ctx, a jobject representing the global android.context.Context.
+func RunOnJVM(fn func(vm, env, ctx uintptr) error) error {
+	errch := make(chan error)
+	go func() {
+		runtime.LockOSThread()
+		defer runtime.UnlockOSThread()
+
+		env := C.uintptr_t(0)
+		attached := C.int(0)
+		if errStr := C.lockJNI(currentVM, &env, &attached); errStr != nil {
+			errch <- errors.New(C.GoString(errStr))
+			return
+		}
+		if attached != 0 {
+			defer C.unlockJNI(currentVM)
+		}
+
+		vm := uintptr(unsafe.Pointer(currentVM))
+		if err := fn(vm, uintptr(env), uintptr(currentCtx)); err != nil {
+			errch <- err
+			return
+		}
+
+		if exc := C.checkException(env); exc != nil {
+			errch <- errors.New(C.GoString(exc))
+			C.free(unsafe.Pointer(exc))
+			return
+		}
+		errch <- nil
+	}()
+	return <-errch
+}

internal/mobileinit/mobileinit.go

@@ -0,0 +1,11 @@
+// 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 mobileinit contains common initialization logic for mobile platforms
+// that is relevant to both all-Go apps and gobind-based apps.
+//
+// Long-term, some code in this package should consider moving into Go stdlib.
+package mobileinit
+
+import "C"

internal/mobileinit/mobileinit_android.go

@@ -0,0 +1,93 @@
+// Copyright 2014 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 mobileinit
+
+/*
+To view the log output run:
+adb logcat GoLog:I *:S
+*/
+
+// Android redirects stdout and stderr to /dev/null.
+// As these are common debugging utilities in Go,
+// we redirect them to logcat.
+//
+// Unfortunately, logcat is line oriented, so we must buffer.
+
+/*
+#cgo LDFLAGS: -landroid -llog
+
+#include <android/log.h>
+#include <stdlib.h>
+#include <string.h>
+*/
+import "C"
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	ctag = C.CString("GoLog")
+	// Store the writer end of the redirected stderr and stdout
+	// so that they are not garbage collected and closed.
+	stderr, stdout *os.File
+)
+
+type infoWriter struct{}
+
+func (infoWriter) Write(p []byte) (n int, err error) {
+	cstr := C.CString(string(p))
+	C.__android_log_write(C.ANDROID_LOG_INFO, ctag, cstr)
+	C.free(unsafe.Pointer(cstr))
+	return len(p), nil
+}
+
+func lineLog(f *os.File, priority C.int) {
+	const logSize = 1024 // matches android/log.h.
+	r := bufio.NewReaderSize(f, logSize)
+	for {
+		line, _, err := r.ReadLine()
+		str := string(line)
+		if err != nil {
+			str += " " + err.Error()
+		}
+		cstr := C.CString(str)
+		C.__android_log_write(priority, ctag, cstr)
+		C.free(unsafe.Pointer(cstr))
+		if err != nil {
+			break
+		}
+	}
+}
+
+func init() {
+	log.SetOutput(infoWriter{})
+	// android logcat includes all of log.LstdFlags
+	log.SetFlags(log.Flags() &^ log.LstdFlags)
+
+	r, w, err := os.Pipe()
+	if err != nil {
+		panic(err)
+	}
+	stderr = w
+	if err := syscall.Dup3(int(w.Fd()), int(os.Stderr.Fd()), 0); err != nil {
+		panic(err)
+	}
+	go lineLog(r, C.ANDROID_LOG_ERROR)
+
+	r, w, err = os.Pipe()
+	if err != nil {
+		panic(err)
+	}
+	stdout = w
+	if err := syscall.Dup3(int(w.Fd()), int(os.Stdout.Fd()), 0); err != nil {
+		panic(err)
+	}
+	go lineLog(r, C.ANDROID_LOG_INFO)
+}

internal/mobileinit/mobileinit_ios.go

@@ -0,0 +1,41 @@
+// 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 mobileinit
+
+import (
+	"io"
+	"log"
+	"os"
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include <os/log.h>
+
+os_log_t create_os_log() {
+	return os_log_create("org.golang.mobile", "os_log");
+}
+
+void os_log_wrap(os_log_t log, const char *str) {
+	os_log(log, "%s", str);
+}
+*/
+import "C"
+
+type osWriter struct {
+	w C.os_log_t
+}
+
+func (o osWriter) Write(p []byte) (n int, err error) {
+	cstr := C.CString(string(p))
+	C.os_log_wrap(o.w, cstr)
+	C.free(unsafe.Pointer(cstr))
+	return len(p), nil
+}
+
+func init() {
+	log.SetOutput(io.MultiWriter(os.Stderr, osWriter{C.create_os_log()}))
+}