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internal,bind: resolve overloaded methods at runtime

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Before this CL, calling overloaded methods on reverse bound Java
classes and interfaces involved confusing and ugly name mangling.
If a set of methods with the same name differed only in argument count,
the mangling was simply adding the argument count to the name:

func F()
func F1(int32)

But if two or more methods had the same number of arguments, the type
had to be appended:

func (...) F() int32
func (...) F1(int32) (int32, error)
func (...) F__I(int32, int32)
func (...) F__JLjava_util_concurrent_TimeUnit_2(int64, concurrent.TimeUnit)

This CL sacrifices a bit of type safety and performance to regain the
convenience and simplicity of Go by resolving overloaded method dispatch
at runtime.

Overloaded Java methods are combined to one Go method that, when invoked,
determines the correct Java method variant at runtime.

The signature of the Go method  is compatible with every Java method with
that name. For the example above, the single Go method becomes the most
general

func (...) F(...interface{}) (interface{}, error)

The method is variadic to cover function with a varying number of
arguments, and it returns interface{} to cover int32, int64 and no
argument. Finally, it returns an error to cover the variant that returns
an error. The generator tries to be specific; for example

func G1(int32) int32
func G2(int32, int32) int32

becomes

func G(int32, ...int32) int32

Overriding Java methods in Go is changed to use the Go parameter types to
determine to correct Java method. To avoid name clashes when overriding
multiple overloaded methods, trailing underscores in the method name are
ignored when matching Java methods.  See the Get methods of GoFuture in
bind/testpkg/javapkg for an example.

Change-Id: I6ac3e024141daa8fc2c35187865c5d7a63368094
Reviewed-on: https://go-review.googlesource.com/35186
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Elias Naur
2017-01-17 14:03:33 +00:00
parent 1aa9ad5c48
commit 3884e8cb98
12 changed files with 1888 additions and 543 deletions
Download Patch File Download Diff File Expand all files Collapse all files
bind/testdata/classes.java.c.golden
Vendored
+198 -5
View File
@@ -8,13 +8,33 @@ static jclass class_java_lang_Runnable;
static jmethodID m_java_lang_Runnable_run;
static jclass class_java_io_InputStream;
static jmethodID m_java_io_InputStream_read__;
static jmethodID m_java_io_InputStream_read___3B;
static jmethodID m_java_io_InputStream_read___3BII;
static jclass class_java_util_concurrent_Future;
static jmethodID m_java_util_concurrent_Future_get__;
static jmethodID m_java_util_concurrent_Future_get__JLjava_util_concurrent_TimeUnit_2;
static jclass class_java_lang_Object;
static jclass class_java_util_concurrent_TimeUnit;
static jclass class_java_util_Spliterators;
static jmethodID m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_2;
static jmethodID m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfInt_2;
static jmethodID m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfLong_2;
static jmethodID m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfDouble_2;
ret_jint cproxy_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_2(jint a0) {
JNIEnv *env = go_seq_push_local_frame(1);
jobject _a0 = go_seq_from_refnum(env, a0, NULL, NULL);
jobject res = (*env)->CallStaticObjectMethod(env, class_java_util_Spliterators, m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_2, _a0);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = NULL;
}
jint _res = go_seq_to_refnum(env, res);
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
ret_jint cproxy_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfInt_2(jint a0) {
JNIEnv *env = go_seq_push_local_frame(1);
jobject _a0 = go_seq_from_refnum(env, a0, NULL, NULL);
@@ -30,6 +50,36 @@ ret_jint cproxy_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024O
return __res;
}
ret_jint cproxy_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfLong_2(jint a0) {
JNIEnv *env = go_seq_push_local_frame(1);
jobject _a0 = go_seq_from_refnum(env, a0, NULL, NULL);
jobject res = (*env)->CallStaticObjectMethod(env, class_java_util_Spliterators, m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfLong_2, _a0);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = NULL;
}
jint _res = go_seq_to_refnum(env, res);
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
ret_jint cproxy_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfDouble_2(jint a0) {
JNIEnv *env = go_seq_push_local_frame(1);
jobject _a0 = go_seq_from_refnum(env, a0, NULL, NULL);
jobject res = (*env)->CallStaticObjectMethod(env, class_java_util_Spliterators, m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfDouble_2, _a0);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = NULL;
}
jint _res = go_seq_to_refnum(env, res);
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
static jclass class_java_lang_System;
static jmethodID m_s_java_lang_System_console;
ret_jint cproxy_s_java_lang_System_console() {
@@ -56,19 +106,29 @@ static jclass class_java_InputStream;
static jclass sclass_java_InputStream;
static jmethodID m_java_InputStream_read__;
static jmethodID sm_java_InputStream_read__;
static jmethodID m_java_InputStream_read___3B;
static jmethodID sm_java_InputStream_read___3B;
static jmethodID m_java_InputStream_read___3BII;
static jmethodID sm_java_InputStream_read___3BII;
static jclass class_java_Object;
static jclass sclass_java_Object;
static jclass class_java_Runnable;
static jclass sclass_java_Runnable;
static jmethodID m_java_Runnable_run;
static jmethodID sm_java_Runnable_run;
static jclass class_java_util_Iterator;
static jclass class_java_util_Spliterator;
static jclass class_java_util_PrimitiveIterator_OfInt;
static jclass class_java_util_Spliterator_OfInt;
static jclass class_java_util_PrimitiveIterator_OfLong;
static jclass class_java_util_Spliterator_OfLong;
static jclass class_java_util_PrimitiveIterator_OfDouble;
static jclass class_java_util_Spliterator_OfDouble;
static jclass class_java_io_Console;
static jmethodID m_java_io_Console_flush;
void init_proxies() {
JNIEnv *env = go_seq_push_local_frame(14);
JNIEnv *env = go_seq_push_local_frame(20);
jclass clazz;
clazz = (*env)->FindClass(env, "java/lang/Runnable");
class_java_lang_Runnable = (*env)->NewGlobalRef(env, clazz);
@@ -76,6 +136,8 @@ void init_proxies() {
clazz = (*env)->FindClass(env, "java/io/InputStream");
class_java_io_InputStream = (*env)->NewGlobalRef(env, clazz);
m_java_io_InputStream_read__ = go_seq_get_method_id(clazz, "read", "()I");
m_java_io_InputStream_read___3B = go_seq_get_method_id(clazz, "read", "([B)I");
m_java_io_InputStream_read___3BII = go_seq_get_method_id(clazz, "read", "([BII)I");
clazz = (*env)->FindClass(env, "java/util/concurrent/Future");
class_java_util_concurrent_Future = (*env)->NewGlobalRef(env, clazz);
m_java_util_concurrent_Future_get__ = go_seq_get_method_id(clazz, "get", "()Ljava/lang/Object;");
@@ -86,7 +148,10 @@ void init_proxies() {
class_java_util_concurrent_TimeUnit = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/Spliterators");
class_java_util_Spliterators = (*env)->NewGlobalRef(env, clazz);
m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_2 = go_seq_get_static_method_id(clazz, "iterator", "(Ljava/util/Spliterator;)Ljava/util/Iterator;");
m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfInt_2 = go_seq_get_static_method_id(clazz, "iterator", "(Ljava/util/Spliterator$OfInt;)Ljava/util/PrimitiveIterator$OfInt;");
m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfLong_2 = go_seq_get_static_method_id(clazz, "iterator", "(Ljava/util/Spliterator$OfLong;)Ljava/util/PrimitiveIterator$OfLong;");
m_s_java_util_Spliterators_iterator__Ljava_util_Spliterator_00024OfDouble_2 = go_seq_get_static_method_id(clazz, "iterator", "(Ljava/util/Spliterator$OfDouble;)Ljava/util/PrimitiveIterator$OfDouble;");
clazz = (*env)->FindClass(env, "java/lang/System");
class_java_lang_System = (*env)->NewGlobalRef(env, clazz);
m_s_java_lang_System_console = go_seq_get_static_method_id(clazz, "console", "()Ljava/io/Console;");
@@ -104,6 +169,10 @@ void init_proxies() {
sclass_java_InputStream = (*env)->NewGlobalRef(env, sclass_java_InputStream);
m_java_InputStream_read__ = go_seq_get_method_id(clazz, "read", "()I");
sm_java_InputStream_read__ = go_seq_get_method_id(sclass_java_InputStream, "read", "()I");
m_java_InputStream_read___3B = go_seq_get_method_id(clazz, "read", "([B)I");
sm_java_InputStream_read___3B = go_seq_get_method_id(sclass_java_InputStream, "read", "([B)I");
m_java_InputStream_read___3BII = go_seq_get_method_id(clazz, "read", "([BII)I");
sm_java_InputStream_read___3BII = go_seq_get_method_id(sclass_java_InputStream, "read", "([BII)I");
clazz = (*env)->FindClass(env, "java/Object");
class_java_Object = (*env)->NewGlobalRef(env, clazz);
sclass_java_Object = (*env)->GetSuperclass(env, clazz);
@@ -114,10 +183,22 @@ void init_proxies() {
sclass_java_Runnable = (*env)->NewGlobalRef(env, sclass_java_Runnable);
m_java_Runnable_run = go_seq_get_method_id(clazz, "run", "()V");
sm_java_Runnable_run = go_seq_get_method_id(sclass_java_Runnable, "run", "()V");
clazz = (*env)->FindClass(env, "java/util/Iterator");
class_java_util_Iterator = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/Spliterator");
class_java_util_Spliterator = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/PrimitiveIterator$OfInt");
class_java_util_PrimitiveIterator_OfInt = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/Spliterator$OfInt");
class_java_util_Spliterator_OfInt = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/PrimitiveIterator$OfLong");
class_java_util_PrimitiveIterator_OfLong = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/Spliterator$OfLong");
class_java_util_Spliterator_OfLong = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/PrimitiveIterator$OfDouble");
class_java_util_PrimitiveIterator_OfDouble = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/util/Spliterator$OfDouble");
class_java_util_Spliterator_OfDouble = (*env)->NewGlobalRef(env, clazz);
clazz = (*env)->FindClass(env, "java/io/Console");
class_java_io_Console = (*env)->NewGlobalRef(env, clazz);
m_java_io_Console_flush = go_seq_get_method_id(clazz, "flush", "()V");
@@ -151,6 +232,42 @@ ret_jint cproxy_java_io_InputStream_read__(jint this) {
return __res;
}
ret_jint cproxy_java_io_InputStream_read___3B(jint this, nbyteslice a0) {
JNIEnv *env = go_seq_push_local_frame(2);
// Must be a Java object
jobject _this = go_seq_from_refnum(env, this, NULL, NULL);
jbyteArray _a0 = go_seq_to_java_bytearray(env, a0, 0);
jint res = (*env)->CallIntMethod(env, _this, m_java_io_InputStream_read___3B, _a0);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = 0;
}
jint _res = res;
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
ret_jint cproxy_java_io_InputStream_read___3BII(jint this, nbyteslice a0, jint a1, jint a2) {
JNIEnv *env = go_seq_push_local_frame(4);
// Must be a Java object
jobject _this = go_seq_from_refnum(env, this, NULL, NULL);
jbyteArray _a0 = go_seq_to_java_bytearray(env, a0, 0);
jint _a1 = a1;
jint _a2 = a2;
jint res = (*env)->CallIntMethod(env, _this, m_java_io_InputStream_read___3BII, _a0, _a1, _a2);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = 0;
}
jint _res = res;
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
ret_jint cproxy_java_util_concurrent_Future_get__(jint this) {
JNIEnv *env = go_seq_push_local_frame(1);
// Must be a Java object
@@ -285,6 +402,78 @@ ret_jint csuper_java_InputStream_read__(jint this) {
return __res;
}
ret_jint cproxy_java_InputStream_read___3B(jint this, nbyteslice a0) {
JNIEnv *env = go_seq_push_local_frame(2);
// Must be a Java object
jobject _this = go_seq_from_refnum(env, this, NULL, NULL);
jbyteArray _a0 = go_seq_to_java_bytearray(env, a0, 0);
jint res = (*env)->CallIntMethod(env, _this, m_java_InputStream_read___3B, _a0);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = 0;
}
jint _res = res;
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
ret_jint csuper_java_InputStream_read___3B(jint this, nbyteslice a0) {
JNIEnv *env = go_seq_push_local_frame(2);
// Must be a Java object
jobject _this = go_seq_from_refnum(env, this, NULL, NULL);
jbyteArray _a0 = go_seq_to_java_bytearray(env, a0, 0);
jint res = (*env)->CallNonvirtualIntMethod(env, _this, sclass_java_InputStream, sm_java_InputStream_read___3B, _a0);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = 0;
}
jint _res = res;
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
ret_jint cproxy_java_InputStream_read___3BII(jint this, nbyteslice a0, jint a1, jint a2) {
JNIEnv *env = go_seq_push_local_frame(4);
// Must be a Java object
jobject _this = go_seq_from_refnum(env, this, NULL, NULL);
jbyteArray _a0 = go_seq_to_java_bytearray(env, a0, 0);
jint _a1 = a1;
jint _a2 = a2;
jint res = (*env)->CallIntMethod(env, _this, m_java_InputStream_read___3BII, _a0, _a1, _a2);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = 0;
}
jint _res = res;
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
ret_jint csuper_java_InputStream_read___3BII(jint this, nbyteslice a0, jint a1, jint a2) {
JNIEnv *env = go_seq_push_local_frame(4);
// Must be a Java object
jobject _this = go_seq_from_refnum(env, this, NULL, NULL);
jbyteArray _a0 = go_seq_to_java_bytearray(env, a0, 0);
jint _a1 = a1;
jint _a2 = a2;
jint res = (*env)->CallNonvirtualIntMethod(env, _this, sclass_java_InputStream, sm_java_InputStream_read___3BII, _a0, _a1, _a2);
jobject _exc = go_seq_get_exception(env);
int32_t _exc_ref = go_seq_to_refnum(env, _exc);
if (_exc != NULL) {
res = 0;
}
jint _res = res;
go_seq_pop_local_frame(env);
ret_jint __res = {_res, _exc_ref};
return __res;
}
jint cproxy_java_Runnable_run(jint this) {
JNIEnv *env = go_seq_push_local_frame(1);
// Must be a Java object
@@ -368,8 +557,10 @@ Java_java_Future__1_1New(JNIEnv *env, jclass clazz) {
JNIEXPORT jobject JNICALL
Java_java_Future_get__(JNIEnv* env, jobject __this__) {
int32_t o = go_seq_to_refnum_go(env, __this__);
int32_t r0 = proxyjava_Future_Get(o);
jobject _r0 = go_seq_from_refnum(env, r0, NULL, NULL);
struct proxyjava_Future_Get_return res = proxyjava_Future_Get(o);
jobject _r0 = go_seq_from_refnum(env, res.r0, NULL, NULL);
jobject _r1 = go_seq_from_refnum(env, res.r1, proxy_class__error, proxy_class__error_cons);
go_seq_maybe_throw_exception(env, _r1);
return _r0;
}
@@ -378,8 +569,10 @@ Java_java_Future_get__JLjava_util_concurrent_TimeUnit_2(JNIEnv* env, jobject __t
int32_t o = go_seq_to_refnum_go(env, __this__);
int64_t _p0 = (int64_t)p0;
int32_t _p1 = go_seq_to_refnum(env, p1);
int32_t r0 = proxyjava_Future_Get2(o, _p0, _p1);
jobject _r0 = go_seq_from_refnum(env, r0, NULL, NULL);
struct proxyjava_Future_Get__return res = proxyjava_Future_Get_(o, _p0, _p1);
jobject _r0 = go_seq_from_refnum(env, res.r0, NULL, NULL);
jobject _r1 = go_seq_from_refnum(env, res.r1, proxy_class__error, proxy_class__error_cons);
go_seq_maybe_throw_exception(env, _r1);
return _r0;
}