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authorSven Gothel <[email protected]>2014-06-17 01:35:28 +0200
committerSven Gothel <[email protected]>2014-06-17 01:35:28 +0200
commitc3054a01990e55ab35756ea23ab7d7c05f24dd37 (patch)
tree96bd10e51cafe024a56d7b95594c7364d929c768 /test/issue7.cfg
parent9d857ea3575ee263801741a95711d9214c156276 (diff)
GlueGen: Add support for 'compound call-by-value', i.e. passing and returning struct instance
'compound call-by-value' is not efficient. However, to allow mapping APIs utilizing passing small structs as arguments and return values - this feature has been added. +++ To return the struct value, native code needs to allocate a NIO ByteBuffer and copy the data. The stack return value can be dismissed afterwards and the NIO buffer is returned. We include this functionality for all generated [impl] classes, native method: 'static jobject JVMUtil_NewDirectByteBufferCopy(JNIEnv *env, void * source_address, jlong capacity)' (See: 'JavaEmitter.initClassAccessCode') Since this code requires knowledge of java classes and methods, for which a reference needs to be acquired, a static initialization method has been introduced for all generated [impl] classes: 'private static native boolean initializeImpl();' Per default the this method will be called in the new static initializer block of the class, which can be supressed via the configuration element: 'ManualStaticInit <class-name>' 'ManualStaticInit' can be used to issue the 'initializeImpl()' call in a custom static initializer written by the user. However, at the time 'initializeImpl()' gets called the JNI native library must have been loaded, of course! +++ - See tag: // FIXME: Compound call-by-value for code changes and validation of completeness Trigger for compond call-by-value in CMethodBindingEmitter is: !cArgType.isPointer() && javaArgType.isCompoundTypeWrapper() Trigger for compond call-by-value in JavaEmitter is: t.isCompound() +++ Further more we do tolerate 'javaType.isCPrimitivePointerType()', i.e. adding comments for offset/size and field entries, which are all NOP. This allows to utilize the remaining fields of the native structure. +++ Tests: Added call-by-value to test1.[ch] binding test!
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