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feat: enable looking up values of static fields

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This commit is contained in:
Chris Waldon 2020-06-20 11:27:23 -04:00
parent d0d3f316ae
commit b380472956
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GPG Key ID: 35BBC7C073F5A5D3
3 changed files with 156 additions and 0 deletions
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10
gojni.h
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@ -7,6 +7,7 @@ __attribute__ ((visibility ("hidden"))) void _jni_ExceptionClear(JNIEnv *env);
__attribute__ ((visibility ("hidden"))) jclass _jni_GetObjectClass(JNIEnv *env, jobject obj);
__attribute__ ((visibility ("hidden"))) jmethodID _jni_GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig);
__attribute__ ((visibility ("hidden"))) jmethodID _jni_GetStaticMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig);
__attribute__ ((visibility ("hidden"))) jfieldID _jni_GetStaticFieldID(JNIEnv *env, jclass clazz, const char *name, const char *sig);
__attribute__ ((visibility ("hidden"))) jsize _jni_GetStringLength(JNIEnv *env, jstring str);
__attribute__ ((visibility ("hidden"))) const jchar *_jni_GetStringChars(JNIEnv *env, jstring str);
__attribute__ ((visibility ("hidden"))) jstring _jni_NewString(JNIEnv *env, const jchar *unicodeChars, jsize len);
@ -23,3 +24,12 @@ __attribute__ ((visibility ("hidden"))) jbyteArray _jni_NewByteArray(JNIEnv *env
__attribute__ ((visibility ("hidden"))) jbyte *_jni_GetByteArrayElements(JNIEnv *env, jbyteArray arr);
__attribute__ ((visibility ("hidden"))) void _jni_ReleaseByteArrayElements(JNIEnv *env, jbyteArray arr, jbyte *elems, jint mode);
__attribute__ ((visibility ("hidden"))) jsize _jni_GetArrayLength(JNIEnv *env, jarray arr);
__attribute__ ((visibility ("hidden"))) jobject _jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jboolean _jni_GetStaticBooleanField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jbyte _jni_GetStaticByteField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jchar _jni_GetStaticCharField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jshort _jni_GetStaticShortField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jint _jni_GetStaticIntField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jlong _jni_GetStaticLongField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jfloat _jni_GetStaticFloatField(JNIEnv *env, jclass clazz, jfieldID fieldID);
__attribute__ ((visibility ("hidden"))) jdouble _jni_GetStaticDoubleField(JNIEnv *env, jclass clazz, jfieldID fieldID);

41
jni.c
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@ -36,6 +36,10 @@ jmethodID _jni_GetStaticMethodID(JNIEnv *env, jclass clazz, const char *name, co
return (*env)->GetStaticMethodID(env, clazz, name, sig);
}
jfieldID _jni_GetStaticFieldID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
return (*env)->GetStaticFieldID(env, clazz, name, sig);
}
jsize _jni_GetStringLength(JNIEnv *env, jstring str) {
return (*env)->GetStringLength(env, str);
}
@ -99,3 +103,40 @@ void _jni_ReleaseByteArrayElements(JNIEnv *env, jbyteArray arr, jbyte *elems, ji
jsize _jni_GetArrayLength(JNIEnv *env, jarray arr) {
return (*env)->GetArrayLength(env, arr);
}
jobject _jni_GetStaticObjectField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticObjectField(env, clazz, fieldID);
}
jboolean _jni_GetStaticBooleanField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticBooleanField(env, clazz, fieldID);
}
jbyte _jni_GetStaticByteField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticByteField(env, clazz, fieldID);
}
jchar _jni_GetStaticCharField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticCharField(env, clazz, fieldID);
}
jshort _jni_GetStaticShortField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticShortField(env, clazz, fieldID);
}
jint _jni_GetStaticIntField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticIntField(env, clazz, fieldID);
}
jlong _jni_GetStaticLongField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticLongField(env, clazz, fieldID);
}
jfloat _jni_GetStaticFloatField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticFloatField(env, clazz, fieldID);
}
jdouble _jni_GetStaticDoubleField(JNIEnv *env, jclass clazz, jfieldID fieldID) {
return (*env)->GetStaticDoubleField(env, clazz, fieldID);
}

105
jni.go
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@ -38,6 +38,7 @@ type (
Class C.jclass
Object C.jobject
MethodID C.jmethodID
FieldID C.jfieldID
String C.jstring
ByteArray C.jbyteArray
Value uint64 // All JNI types fit into 64-bits.
@ -212,6 +213,20 @@ func GetStaticMethodID(e Env, cls Class, name, signature string) MethodID {
return MethodID(m)
}
// GetStaticFieldID returns the id for a static field. It panics if the field
// wasn't found.
func GetStaticFieldID(e Env, cls Class, name, signature string) FieldID {
mname := C.CString(name)
defer C.free(unsafe.Pointer(mname))
msig := C.CString(signature)
defer C.free(unsafe.Pointer(msig))
m := C._jni_GetStaticFieldID(e.env, C.jclass(cls), mname, msig)
if err := exception(e); err != nil {
panic(err)
}
return FieldID(m)
}
// GetMethodID returns the id for a method. It panics if the method
// wasn't found.
func GetMethodID(e Env, cls Class, name, signature string) MethodID {
@ -259,3 +274,93 @@ func GoString(e Env, str String) string {
utf8 := utf16.Decode(utf16Chars)
return string(utf8)
}
// GetStaticObjectField looks up the value of a static field of type Object.
// It panics if it is unable to find the field.
func GetStaticObjectField(env Env, clazz Class, fieldID FieldID) Object {
value := C._jni_GetStaticObjectField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return Object(value)
}
// GetStaticBooleanField looks up the value of a static field of type boolean.
// It panics if it is unable to find the field.
func GetStaticBooleanField(env Env, clazz Class, fieldID FieldID) bool {
value := C._jni_GetStaticBooleanField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return value != 0
}
// GetStaticByteField looks up the value of a static field of type byte.
// It panics if it is unable to find the field.
func GetStaticByteField(env Env, clazz Class, fieldID FieldID) byte {
value := C._jni_GetStaticByteField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return byte(value)
}
// GetStaticCharField looks up the value of a static field of type char.
// It panics if it is unable to find the field.
func GetStaticCharField(env Env, clazz Class, fieldID FieldID) byte {
value := C._jni_GetStaticCharField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return byte(value)
}
// GetStaticShortField looks up the value of a static field of type short.
// It panics if it is unable to find the field.
func GetStaticShortField(env Env, clazz Class, fieldID FieldID) int16 {
value := C._jni_GetStaticShortField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return int16(value)
}
// GetStaticIntField looks up the value of a static field of type int.
// It panics if it is unable to find the field.
func GetStaticIntField(env Env, clazz Class, fieldID FieldID) int32 {
value := C._jni_GetStaticIntField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return int32(value)
}
// GetStaticLongField looks up the value of a static field of type long.
// It panics if it is unable to find the field.
func GetStaticLongField(env Env, clazz Class, fieldID FieldID) int64 {
value := C._jni_GetStaticLongField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return int64(value)
}
// GetStaticFloatField looks up the value of a static field of type float.
// It panics if it is unable to find the field.
func GetStaticFloatField(env Env, clazz Class, fieldID FieldID) float32 {
value := C._jni_GetStaticFloatField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return float32(value)
}
// GetStaticDoubleField looks up the value of a static field of type double.
// It panics if it is unable to find the field.
func GetStaticDoubleField(env Env, clazz Class, fieldID FieldID) float64 {
value := C._jni_GetStaticDoubleField(env.env, C.jclass(clazz), C.jfieldID(fieldID))
if err := exception(env); err != nil {
panic(err)
}
return float64(value)
}