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exception handling, overloading, global scope (#7)
* add try catch to jni * bug fix for exception handler * make get operator return nullable value * add ability to do things in global scope to get away from memory management * bug fix and more unit tests * add comments * add support for overloading methods * optimize thread to avoid deadlock * add global memory table and unit tests for it * handle null property in json object --------- Co-authored-by: Wenxi Zeng <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,20 +1,29 @@ | ||
| #include <stdio.h> | ||
| #include <string> | ||
| #include <iostream> | ||
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| #include "java_helper.h" | ||
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| #define MAX_MSG_SIZE 1024 | ||
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| jint throw_exception(JNIEnv *env, const char *exception_name, const char *message, ...) { | ||
| char formatted_message[MAX_MSG_SIZE]; | ||
| va_list va_args; | ||
| va_start(va_args, message); | ||
| vsnprintf(formatted_message, MAX_MSG_SIZE, message, va_args); | ||
| va_end(va_args); | ||
| void swallow_cpp_exception_and_throw_java(JNIEnv * env) { | ||
| try { | ||
| throw; | ||
| } catch(const ThrownJavaException&) { | ||
| //already reported to Java, ignore | ||
| } catch(const std::bad_alloc& rhs) { | ||
| //translate OOM C++ exception to a Java exception | ||
| NewJavaException(env, "java/lang/OutOfMemoryError", rhs.what()); | ||
| } catch(const std::ios_base::failure& rhs) { //sample translation | ||
| //translate IO C++ exception to a Java exception | ||
| NewJavaException(env, "java/io/IOException", rhs.what()); | ||
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| jclass exception_class = env->FindClass(exception_name); | ||
| if (exception_class == NULL) { | ||
| return -1; | ||
| } | ||
| //TRANSLATE ANY OTHER C++ EXCEPTIONS TO JAVA EXCEPTIONS HERE | ||
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| return env->ThrowNew(exception_class, formatted_message); | ||
| } | ||
| } catch(const std::exception& e) { | ||
| //translate unknown C++ exception to a Java exception | ||
| NewJavaException(env, "java/lang/Error", e.what()); | ||
| } catch(...) { | ||
| //translate unknown C++ exception to a Java exception | ||
| NewJavaException(env, "java/lang/Error", "Unknown exception type"); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,48 +1,50 @@ | ||
| // | ||
| // Created by Wenxi Zeng on 3/1/24. | ||
| // See the original post here: https://stackoverflow.com/a/12014833/8296631 | ||
| // | ||
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| #ifndef SUBSTRATA_KOTLIN_JAVA_HELPER_H | ||
| #define SUBSTRATA_KOTLIN_JAVA_HELPER_H | ||
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| #include <jni.h> | ||
| #include <string> | ||
| #include <stdexcept> | ||
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| #define CLASS_NAME_ILLEGAL_STATE_EXCEPTION "java/lang/IllegalStateException" | ||
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| #define THROW_EXCEPTION(ENV, EXCEPTION_NAME, ...) \ | ||
| do { \ | ||
| throw_exception((ENV), (EXCEPTION_NAME), __VA_ARGS__); \ | ||
| return; \ | ||
| } while (0) | ||
| #define THROW_EXCEPTION_RET(ENV, EXCEPTION_NAME, ...) \ | ||
| do { \ | ||
| throw_exception((ENV), (EXCEPTION_NAME), __VA_ARGS__); \ | ||
| return 0; \ | ||
| } while (0) | ||
| #define MSG_OOM "Out of memory" | ||
| #define MSG_NULL_JS_RUNTIME "Null JSRuntime" | ||
| #define MSG_NULL_JS_CONTEXT "Null JSContext" | ||
| #define MSG_NULL_JS_VALUE "Null JSValue" | ||
| #define THROW_ILLEGAL_STATE_EXCEPTION(ENV, ...) \ | ||
| THROW_EXCEPTION(ENV, CLASS_NAME_ILLEGAL_STATE_EXCEPTION, __VA_ARGS__) | ||
| #define THROW_ILLEGAL_STATE_EXCEPTION_RET(ENV, ...) \ | ||
| THROW_EXCEPTION_RET(ENV, CLASS_NAME_ILLEGAL_STATE_EXCEPTION, __VA_ARGS__) | ||
| #define CHECK_NULL(ENV, POINTER, MESSAGE) \ | ||
| do { \ | ||
| if ((POINTER) == NULL) { \ | ||
| THROW_ILLEGAL_STATE_EXCEPTION((ENV), (MESSAGE)); \ | ||
| } \ | ||
| } while (0) | ||
| #define CHECK_NULL_RET(ENV, POINTER, MESSAGE) \ | ||
| do { \ | ||
| if ((POINTER) == NULL) { \ | ||
| THROW_ILLEGAL_STATE_EXCEPTION_RET((ENV), (MESSAGE)); \ | ||
| } \ | ||
| } while (0) | ||
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| #define MAX_MSG_SIZE 1024 | ||
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| jint throw_exception(JNIEnv *env, const char *exception_name, const char *message, ...); | ||
| #define CLASS_NAME_ILLEGAL_STATE_EXCEPTION "java/lang/IllegalStateException" | ||
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| struct ThrownJavaException : std::exception { | ||
| ThrownJavaException(const std::string& message) : m_message(message) {} | ||
| ThrownJavaException() : m_message("") {} | ||
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| // Override the what() method to provide a description of the exception | ||
| const char* what() const noexcept override { | ||
| return m_message.c_str(); | ||
| } | ||
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| private: | ||
| std::string m_message; | ||
| }; | ||
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| //used to throw a new Java exception. use full paths like: | ||
| //"java/lang/NoSuchFieldException" | ||
| //"java/lang/NullPointerException" | ||
| //"java/security/InvalidParameterException" | ||
| struct NewJavaException : public ThrownJavaException{ | ||
| NewJavaException(JNIEnv * env, const char* type, const char* message="") | ||
| :ThrownJavaException(type+std::string(" ")+message) | ||
| { | ||
| jclass newExcCls = env->FindClass(type); | ||
| if (newExcCls != NULL) | ||
| env->ThrowNew(newExcCls, message); | ||
| //if it is null, a NoClassDefFoundError was already thrown | ||
| } | ||
| }; | ||
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| inline void assert_no_exception(JNIEnv * env) { | ||
| if (env->ExceptionCheck()==JNI_TRUE) | ||
| throw ThrownJavaException("assert_no_exception"); | ||
| } | ||
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| void swallow_cpp_exception_and_throw_java(JNIEnv * env); | ||
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| #endif //SUBSTRATA_KOTLIN_JAVA_HELPER_H |
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