ChromiumJniGenerator - Jni Generator module extracted from Chromium project

Overview

How to use the ChromiumJniGenerator

1 Dependencies

1.1 C ++ dependencies

Copy two directories: chromium-jni-generator-native-essential and chromium-jni-generator-native-gen-script to your project pic1 The chromium-jni-generator-neutral-essential directory contains the chromium_jni_generator_native_essential .h and chromium_jni_generator_native_essential.cc pic2 The chromium-jni-generator-native-gen-script directory contains python scripts that generate native code pic3 chromium_native_code_gen.sh is an example of using python scripts to generate native code

#!/bin/bash

#create code generation directories
rm -rf ./gen
mkdir -p gen/cpp
mkdir -p gen/java

#generate native code
./jni_generator.py --input_file XXXXA.java --input_file XXXXB.java --output_file gen/cpp/XXXXA.h --output_file gen/cpp/XXXXB.h

1.2 Java dependencies

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}
dependencies {
    compileOnly 'com.github.allenxuan.ChromiumJniGenerator:chromium-jni-generator-jvm-annotations:v1.0.0'
    kapt 'com.github.allenxuan.ChromiumJniGenerator:chromium-jni-generator-jvm-compiler:v1.0.0'
}

2 Java Layer Access C/C ++ Layer ( JNI )

Define native functions in the Java layer

`ChromiumJniTestA.java`

@JNINamespace("test::your::name::space")
public class ChromiumJniTestA {
//Work
public static native boolean nativeFunctionAA(boolean param1, float param2);

    //Not work. "static" should be put in front of "native".
    public native static boolean nativeFunctionAB(boolean param1, float param2);

    //Work
    public native long nativeFunctionAC(String param1);

    //Not work. The function name should starts with "native".
    public native long functionAD(String param1);
}

Or define native methods with @NativeMethods annotations

`ChromiumJniTestB.java`

@JNINamespace("test::your::name::space")
public class ChromiumJniTestB {
@NativeMethods
interface Natives {
boolean nativeFunctionBA(boolean param1, float param2);

        float functionBB(String param1);
    }
}

Java Annotation Processor generates auxiliary classes ChromiumJniTestBJni.java and GEN_JNI.java from @NativeMethods

`ChromiumJniTestBJni.java`

class ChromiumJniTestBJni implements ChromiumJniTestB.Natives {
  @Override
  public boolean nativeFunctionBA(boolean param1, float param2) {
    return (boolean)GEN_JNI.org_chromium_chromiumjnigenerator_ChromiumJniTestB_nativeFunctionBA(param1, param2);
  }

  @Override
  public float functionBB(String param1) {
    return (float)GEN_JNI.org_chromium_chromiumjnigenerator_ChromiumJniTestB_functionBB(param1);
  }

  public static ChromiumJniTestB.Natives get() {
    return new ChromiumJniTestBJni();
  }
}
`GEN_JNI.java`

public final class GEN_JNI {

  /**
   * org.chromium.chromiumjnigenerator.ChromiumJniTestB.functionBB
   * @param param1 (java.lang.String)
   * @return (float)
   */
  public static final native float org_chromium_chromiumjnigenerator_ChromiumJniTestB_functionBB(
      String param1);

  /**
   * org.chromium.chromiumjnigenerator.ChromiumJniTestB.nativeFunctionBA
   * @param param1 (boolean)
   * @param param2 (float)
   * @return (boolean)
   */
  public static final native boolean org_chromium_chromiumjnigenerator_ChromiumJniTestB_nativeFunctionBA(
      boolean param1, float param2);
}

Generate JNI functions through jni_generator.py

./jni_generator.py --input_file ../java/org/chromium/chromiumjnigenerator/ChromiumJniTestA.java --output_file ../cpp/gen/ChromiumJniTestA.h --input_file ../java/org/chromium/chromiumjnigenerator/ChromiumJniTestB.java --output_file ../cpp/gen/ChromiumJniTestB.h
`ChromiumJniTestA.h`

static jboolean JNI_ChromiumJniTestA_FunctionAA(JNIEnv* env, jboolean param1,
    jfloat param2);

JNI_GENERATOR_EXPORT jboolean
    Java_org_chromium_chromiumjnigenerator_ChromiumJniTestA_nativeFunctionAA(
    JNIEnv* env,
    jclass jcaller,
    jboolean param1,
    jfloat param2) {
  return JNI_ChromiumJniTestA_FunctionAA(env, param1, param2);
}

static jlong JNI_ChromiumJniTestA_FunctionAC(JNIEnv* env, const
    chromium::android::JavaParamRef
   & jcaller,
    
   const chromium::android::JavaParamRef
   
    & param1);

JNI_GENERATOR_EXPORT jlong 
    Java_org_chromium_chromiumjnigenerator_ChromiumJniTestA_nativeFunctionAC(
    JNIEnv* env,
    jobject jcaller,
    jstring param1) {
  
    return 
    JNI_ChromiumJniTestA_FunctionAC(env, chromium::android::JavaParamRef
    
     (env,
      jcaller), chromium::android::JavaParamRef
     
      (env, param1));
}
     
    
   
  
`ChromiumJniTestB.h`

static jboolean JNI_ChromiumJniTestB_NativeFunctionBA(JNIEnv* env, jboolean param1,
    jfloat param2);

JNI_GENERATOR_EXPORT jboolean
    Java_org_chromium_base_natives_GEN_1JNI_org_1chromium_1chromiumjnigenerator_1ChromiumJniTestB_1nativeFunctionBA(
    JNIEnv* env,
    jclass jcaller,
    jboolean param1,
    jfloat param2) {
  return JNI_ChromiumJniTestB_NativeFunctionBA(env, param1, param2);
}

static jfloat JNI_ChromiumJniTestB_FunctionBB(JNIEnv* env, const
    chromium::android::JavaParamRef
   & param1);

JNI_GENERATOR_EXPORT jfloat
    
   Java_org_chromium_base_natives_GEN_1JNI_org_1chromium_1chromiumjnigenerator_1ChromiumJniTestB_1functionBB(
    JNIEnv* env,
    jclass jcaller,
    jstring param1) {
  
   return 
   JNI_ChromiumJniTestB_FunctionBB(env, chromium::android::JavaParamRef
   
    (env,
      param1));
}
   
  

Create ChromiumJniTestA.cc and ChromiumJniTestB.cc to implement ChromiumJniTestA.h and ChromiumJniTestB.h

`ChromiumJniTestA.cc`

#include <ChromiumJniTestA.h>

jboolean JNI_ChromiumJniTestA_FunctionAA(JNIEnv *env, jboolean param1,
                                         jfloat param2) {
    return true;
}


jlong JNI_ChromiumJniTestA_FunctionAC(JNIEnv *env, const
chromium::android::JavaParamRef
    &jcaller,
                                      
   const chromium::android::JavaParamRef
   
     &param1) {
    
    return 
    1000.
    f;
}
   
  
`ChromiumJniTestB.cc`

#include <ChromiumJniTestB.h>

jboolean JNI_ChromiumJniTestB_NativeFunctionBA(JNIEnv* env, jboolean param1,
                                                      jfloat param2){
    return true;
}

jfloat JNI_ChromiumJniTestB_FunctionBB(JNIEnv* env, const
chromium::android::JavaParamRef
   & param1){
    
   return 
   3888.
   2f;
}
  

Remember to add the chromium-jni-generator-native-essential directory to the compilation process.

add_library(chromium_jni_generator_test_jni SHARED
        jni_main.cc
        ChromiumJniTestA.cc
        ChromiumJniTestB.cc)
target_include_directories(chromium_jni_generator_test_jni
        PRIVATE ./
        PRIVATE ./gen)

add_subdirectory(../chromium-jni-generator-native-essential chromium_jni_generator_native_essential)

target_link_libraries(chromium_jni_generator_test_jni
        PRIVATE chromium_jni_generator_native_essential)

3 C/C ++ Layer Access to Java Layer

Add @CalledByNative annotations to Java methods

`ChromiumJniTestA.java`

@JNINamespace("test::your::name::space")
public class ChromiumJniTestA {
    ...
    ...

    @CalledByNative
    public static float functionAE(String param1, boolean param2){
        return 9.7f;
    }
}

Generate C/C ++ code through jni_generator.py

g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(nullptr); #ifndef org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz_defined #define org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz_defined inline jclass org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(JNIEnv* env) { return chromium::android::LazyGetClass(env, kClassPath_org_chromium_chromiumjnigenerator_ChromiumJniTestA, &g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz); } #endif static std::atomic g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_functionAE(nullptr); static jfloat Java_ChromiumJniTestA_functionAE(JNIEnv* env, const chromium::android::JavaRef & param1, jboolean param2) { jclass clazz = org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(env); CHECK_CLAZZ(env, clazz, org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(env), 0); chromium::android::JniJavaCallContextChecked call_context; call_context.Init< chromium::android::MethodID::TYPE_STATIC>( env, clazz, "functionAE", "(Ljava/lang/String;Z)F", &g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_functionAE); jfloat ret = env->CallStaticFloatMethod(clazz, call_context.base.method_id, param1.obj(), param2); return ret; }">
`ChromiumJniTestA.h`

JNI_REGISTRATION_EXPORT extern const char
    kClassPath_org_chromium_chromiumjnigenerator_ChromiumJniTestA[];
const char kClassPath_org_chromium_chromiumjnigenerator_ChromiumJniTestA[] =
    "org/chromium/chromiumjnigenerator/ChromiumJniTestA";
// Leaking this jclass as we cannot use LazyInstance from some threads.
JNI_REGISTRATION_EXPORT std::atomic
    
     g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(
     nullptr);
#
     ifndef org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz_defined
#
     define 
     org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz_defined

     inline jclass 
     org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(JNIEnv* env) {
  
     return 
     chromium::android::LazyGetClass(env,
      
     kClassPath_org_chromium_chromiumjnigenerator_ChromiumJniTestA,
      &g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz);
}
#
     endif


     static std::atomic
     
    
      g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_functionAE(
      nullptr);

      static jfloat 
      Java_ChromiumJniTestA_functionAE(JNIEnv* env, 
      const
    chromium::android::JavaRef
      
       & param1,
    jboolean param2) {
  jclass clazz = 
       org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(env);
  
       CHECK_CLAZZ(env, clazz,
      
       org_chromium_chromiumjnigenerator_ChromiumJniTestA_clazz(env), 
       0);

  chromium::android::JniJavaCallContextChecked call_context;
  call_context.
       Init<
      chromium::android::MethodID::TYPE_STATIC>(
          env,
          clazz,
          
       "functionAE",
          
       "(Ljava/lang/String;Z)F",
          &g_org_chromium_chromiumjnigenerator_ChromiumJniTestA_functionAE);

  jfloat ret =
      env->
       CallStaticFloatMethod(clazz,
          call_context.
       base.
       method_id, param1.
       obj(), param2);
  
       return ret;
}
      
     
    
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