mirror of
https://github.com/hajimehoshi/ebiten.git
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109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// This file is copied from golang.org/x/mobile/internal/mobileinit/ctx_android.go
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// and editted.
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// This file is licensed under the 3-clause BSD license.
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package jni
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/*
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#include <jni.h>
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#include <stdlib.h>
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// These definitions are duplicated with those in ctx_android.go of golang.org/x/mobile/internal/mobileinit package.
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// To be exact, this might cause undefined behavior, but some compilers including GCC and Clang work as a common extension.
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// (J.5.11 Multiple external definitions)
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JavaVM* current_vm;
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jobject current_ctx;
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static char* lockJNI(uintptr_t* envp, int* attachedp) {
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JNIEnv* env;
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if (current_vm == NULL) {
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return "no current JVM";
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}
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*attachedp = 0;
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switch ((*current_vm)->GetEnv(current_vm, (void**)&env, JNI_VERSION_1_6)) {
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case JNI_OK:
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break;
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case JNI_EDETACHED:
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if ((*current_vm)->AttachCurrentThread(current_vm, &env, 0) != 0) {
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return "cannot attach to JVM";
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}
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*attachedp = 1;
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break;
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case JNI_EVERSION:
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return "bad JNI version";
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default:
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return "unknown JNI error from GetEnv";
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}
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*envp = (uintptr_t)env;
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return NULL;
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}
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static char* checkException(uintptr_t jnienv) {
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jthrowable exc;
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JNIEnv* env = (JNIEnv*)jnienv;
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if (!(*env)->ExceptionCheck(env)) {
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return NULL;
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}
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exc = (*env)->ExceptionOccurred(env);
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(*env)->ExceptionClear(env);
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jclass clazz = (*env)->FindClass(env, "java/lang/Throwable");
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jmethodID toString = (*env)->GetMethodID(env, clazz, "toString", "()Ljava/lang/String;");
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jobject msgStr = (*env)->CallObjectMethod(env, exc, toString);
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return (char*)(*env)->GetStringUTFChars(env, msgStr, 0);
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}
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static void unlockJNI() {
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(*current_vm)->DetachCurrentThread(current_vm);
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}
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*/
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import "C"
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import (
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"errors"
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"runtime"
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"unsafe"
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)
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// RunOnJVM executes fn on the current VM context.
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//
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// RunOnJVM should not be called on init function since the current VM might not be initialized yet.
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func RunOnJVM(fn func(vm, env, ctx uintptr) error) error {
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errch := make(chan error)
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go func() {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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env := C.uintptr_t(0)
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attached := C.int(0)
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if errStr := C.lockJNI(&env, &attached); errStr != nil {
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errch <- errors.New(C.GoString(errStr))
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return
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}
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if attached != 0 {
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defer C.unlockJNI()
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}
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vm := uintptr(unsafe.Pointer(C.current_vm))
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if err := fn(vm, uintptr(env), uintptr(C.current_ctx)); err != nil {
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errch <- err
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return
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}
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if exc := C.checkException(env); exc != nil {
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errch <- errors.New(C.GoString(exc))
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C.free(unsafe.Pointer(exc))
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return
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}
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errch <- nil
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}()
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return <-errch
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}
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