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/**
* Copyright 2023 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.gluegen;
import java.io.IOException;
import java.util.List;
/**
* C code unit (a generated C source file),
* covering multiple {@link FunctionEmitter} allowing to unify output, decoration and dynamic helper code injection per unit.
**/
public class CCodeUnit extends CodeUnit {
/** base c-unit name with suffix. */
public final String cUnitName;
/**
* @param filename the class's full filename to open w/ write access
* @param cUnitName the base c-unit name, i.e. c-file basename with suffix
* @param generator informal optional object that is creating this unit, used to be mentioned in a warning message if not null.
* @throws IOException
*/
public CCodeUnit(final String filename, final String cUnitName, final Object generator) throws IOException {
super(filename, generator);
this.cUnitName = cUnitName;
CodeGenUtils.emitAutogeneratedWarning(output, generator, "C-Unit: "+cUnitName+", "+filename);
}
public void emitHeader(final String libraryBasename, final String packageName, final String className, final List<String> customCode) {
emitln("#include <jni.h>");
emitln("#include <stdlib.h>");
emitln("#include <string.h>");
emitln("#include <assert.h>");
emitln("#include <stddef.h>");
emitln();
if( null != libraryBasename && libraryBasename.length() > 0 ) {
emitJNIOnLoadJNIEnvDecl(libraryBasename);
}
emitln("static jobject JVMUtil_NewDirectByteBufferCopy(JNIEnv *env, jclass clazzBuffers, void * source_address, size_t capacity); /* forward decl. */");
emitln();
boolean addNewDirectByteBufferCopyUnitCode = false;
for (final String code : customCode) {
emitln(code);
addNewDirectByteBufferCopyUnitCode = addNewDirectByteBufferCopyUnitCode || code.contains("JVMUtil_NewDirectByteBufferCopy");
}
emitln();
if( addNewDirectByteBufferCopyUnitCode ) {
addTailCode(NewDirectByteBufferCopyUnitCode); // potentially used...
}
}
/** Emits {@link #getJNIOnLoadJNIEnvDecl(String)}. */
public void emitJNIOnLoadJNIEnvDecl(final String libraryBasename) {
emitln( getJNIOnLoadJNIEnvDecl(libraryBasename) );
}
/** Emits {@link #getJNIOnLoadJNIEnvCode(String)}. */
public void emitJNIOnLoadJNIEnvCode(final String libraryBasename) {
emitln( getJNIOnLoadJNIEnvCode(libraryBasename) );
}
@Override
public String toString() { return "CCodeUnit[unit "+cUnitName+", file "+filename+"]"; }
public static final String NewDirectByteBufferCopyUnitCode =
"static const char * nameCopyNativeToDirectByteBuffer = \"copyNativeToDirectByteBuffer\";\n"+
"static const char * nameCopyNativeToDirectByteBufferSignature = \"(JJ)Ljava/nio/ByteBuffer;\";\n"+
"\n"+
"static jobject JVMUtil_NewDirectByteBufferCopy(JNIEnv *env, jclass clazzBuffers, void * source_address, size_t capacity) {\n"+
" jmethodID cstrBuffersNew = (*env)->GetStaticMethodID(env, clazzBuffers, nameCopyNativeToDirectByteBuffer, nameCopyNativeToDirectByteBufferSignature);\n"+
" if(NULL==cstrBuffersNew) {\n"+
" fprintf(stderr, \"Can't get method Buffers.%s(%s)\\n\", nameCopyNativeToDirectByteBuffer, nameCopyNativeToDirectByteBufferSignature);\n"+
" (*env)->FatalError(env, nameCopyNativeToDirectByteBuffer);\n"+
" return JNI_FALSE;\n"+
" }\n"+
" jobject jbyteBuffer = (*env)->CallStaticObjectMethod(env, clazzBuffers, cstrBuffersNew, (jlong)(intptr_t)source_address, (jlong)capacity);\n"+
" if( (*env)->ExceptionCheck(env) ) {\n"+
" (*env)->ExceptionDescribe(env);\n"+
" (*env)->ExceptionClear(env);\n"+
" (*env)->FatalError(env, \"Exception occurred\");\n"+
" return NULL;\n"+
" }\n"+
" return jbyteBuffer;\n"+
"}\n";
/**
* Returns native JNI declarations for `JavaVM* {libraryBasename}_jvmHandle`
* and `JVMUtil_GetJNIEnv(..)`.
* <p>
* See {@link #getJNIOnLoadJNIEnvCode(String)} for details.
* </p>
* @param libraryBasename library basename to generate the `JNI_OnLoad_{libraryBasename}(..)` variant for statically linked libraries.
* @return the code
* @see #getJNIOnLoadJNIEnvCode(String)
*/
public static final String getJNIOnLoadJNIEnvDecl(final String libraryBasename) {
return "extern JavaVM *"+libraryBasename+"_jvmHandle;\n"+
"JNIEnv* JVMUtil_GetJNIEnv();\n"+
"\n";
}
/**
* Returns native JNI code `JNI_OnLoad(..)` used for dynamic libraries,
* `JNI_OnLoad_{libraryBasename}(..)` used for static libraries,
* `JVMUtil_GetJNIEnv(..)` and the instance of `JavaVM* {libraryBasename}_jvmHandle`.
* <p>
* The `JNI_OnLoad*(..)` methods set the `JavaVM* {libraryBasename}_jvmHandle`,
* which in turn is utilized by `JVMUtil_GetJNIEnv(..)`
* to attach a new thread to the `JavaVM*` generating a new `JNIEnv*`in daemon mode -
* or just to retrieve the thread's `JNIEnv*`, if already attached to the `JavaVM*`.
* </p>
* @param libraryBasename library basename to generate the `JNI_OnLoad_{libraryBasename}(..)` variant for statically linked libraries.
* @return the code
* @see #getJNIOnLoadJNIEnvDecl(String)
*/
public static final String getJNIOnLoadJNIEnvCode(final String libraryBasename) {
final String jvmHandleName = libraryBasename+"_jvmHandle";
final StringBuilder sb = new StringBuilder();
sb.append("JavaVM *").append(jvmHandleName).append(" = NULL;\n");
sb.append("JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *initVM, void *reserved) {\n");
sb.append(" (void)reserved;\n");
sb.append(" ").append(jvmHandleName).append(" = initVM;\n");
sb.append(" fprintf(stderr, \"ON_LOAD_0\\n\");\n");
sb.append(" return JNI_VERSION_1_8;\n");
sb.append("}\n");
sb.append("JNIEXPORT jint JNICALL JNI_OnLoad_").append(libraryBasename).append("(JavaVM *initVM, void *reserved) {\n");
sb.append(" (void)reserved;\n");
sb.append(" ").append(jvmHandleName).append(" = initVM;\n");
sb.append(" fprintf(stderr, \"ON_LOAD_1\\n\");\n");
sb.append(" return JNI_VERSION_1_8;\n");
sb.append("}\n");
sb.append("\n");
sb.append("JNIEXPORT void JNICALL JNI_OnUnload(JavaVM *vm, void *reserved) {\n");
sb.append(" (void)vm;\n");
sb.append(" (void)reserved;\n");
sb.append(" fprintf(stderr, \"ON_UNLOAD_0\\n\");\n");
sb.append("}\n");
sb.append("\n");
sb.append("JNIEXPORT void JNICALL JNI_OnUnload_").append(libraryBasename).append("(JavaVM *vm, void *reserved) {\n");
sb.append(" (void)vm;\n");
sb.append(" (void)reserved;\n");
sb.append(" fprintf(stderr, \"ON_UNLOAD_1\\n\");\n");
sb.append("}\n");
sb.append("\n");
sb.append("JNIEnv* JVMUtil_GetJNIEnv() {\n");
sb.append(" JNIEnv* curEnv = NULL;\n");
sb.append(" JNIEnv* newEnv = NULL;\n");
sb.append(" int envRes;\n");
sb.append("\n");
sb.append(" if(NULL==").append(jvmHandleName).append(") {\n");
sb.append(" fprintf(stderr, \"JVMUtil_GetJNIEnv(").append(libraryBasename).append("): No JavaVM handle registered.\");\n");
sb.append(" return NULL;\n");
sb.append(" }\n");
sb.append("\n");
sb.append(" // retrieve this thread's JNIEnv curEnv - or detect it's detached\n");
sb.append(" envRes = (*").append(jvmHandleName).append(")->GetEnv(").append(jvmHandleName).append(", (void **) &curEnv, JNI_VERSION_1_8) ;\n");
sb.append(" if( JNI_EDETACHED == envRes ) {\n");
sb.append(" // detached thread - attach to JVM as daemon, w/o need to be detached!\n");
sb.append(" envRes = (*").append(jvmHandleName).append(")->AttachCurrentThreadAsDaemon(").append(jvmHandleName).append(", (void**) &newEnv, NULL);\n");
sb.append(" if( JNI_OK != envRes ) {\n");
sb.append(" fprintf(stderr, \"JVMUtil_GetJNIEnv(").append(libraryBasename).append("): Can't attach thread: %d\\n\", envRes);\n");
sb.append(" return NULL;\n");
sb.append(" }\n");
sb.append(" curEnv = newEnv;\n");
sb.append(" } else if( JNI_OK != envRes ) {\n");
sb.append(" // oops ..\n");
sb.append(" fprintf(stderr, \"JVMUtil_GetJNIEnv(").append(libraryBasename).append("): Can't GetEnv: %d\\n\", envRes);\n");
sb.append(" return NULL;\n");
sb.append(" }\n");
sb.append(" if (curEnv==NULL) {\n");
sb.append(" fprintf(stderr, \"JVMUtil_GetJNIEnv(").append(libraryBasename).append("): env is NULL\\n\");\n");
sb.append(" return NULL;\n");
sb.append(" }\n");
sb.append(" return curEnv;\n");
sb.append("}\n");
sb.append("\n");
return sb.toString();
}
}
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