/*

 * Copyright (c) 2012, 2013 SAP SE. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "jni.h"

#include "memory/allocation.hpp"

#include "oops/oop.hpp"

// This file holds platform-dependent routines used to write primitive

// jni types to the array of arguments passed into JavaCalls::call.

class JNITypes : AllStatic {

  // These functions write a java primitive type (in native format) to

  // a java stack slot array to be passed as an argument to

  // JavaCalls:calls.  I.e., they are functionally 'push' operations

  // if they have a 'pos' formal parameter.  Note that jlong's and

  // jdouble's are written _in reverse_ of the order in which they

  // appear in the interpreter stack.  This is because call stubs (see

  // stubGenerator_sparc.cpp) reverse the argument list constructed by

  // JavaCallArguments (see javaCalls.hpp).

 private:

#ifndef PPC64

#error "ppc32 support currently not implemented!!!"

#endif // PPC64

 public:

  // Ints are stored in native format in one JavaCallArgument slot at *to.

  static inline void put_int(jint  from, intptr_t *to)           { *(jint *)(to +   0  ) =  from; }

  static inline void put_int(jint  from, intptr_t *to, int& pos) { *(jint *)(to + pos++) =  from; }

  static inline void put_int(jint *from, intptr_t *to, int& pos) { *(jint *)(to + pos++) = *from; }

  // Longs are stored in native format in one JavaCallArgument slot at

  // *(to+1).

  static inline void put_long(jlong  from, intptr_t *to) {

    *(jlong*) (to + 1) = from;

  }

  static inline void put_long(jlong  from, intptr_t *to, int& pos) {

    *(jlong*) (to + 1 + pos) = from;

    pos += 2;

  }

  static inline void put_long(jlong *from, intptr_t *to, int& pos) {

    *(jlong*) (to + 1 + pos) = *from;

    pos += 2;

  }

  // Oops are stored in native format in one JavaCallArgument slot at *to.

  static inline void put_obj(oop  from, intptr_t *to)           { *(oop *)(to +   0  ) =  from; }

  static inline void put_obj(oop  from, intptr_t *to, int& pos) { *(oop *)(to + pos++) =  from; }

  static inline void put_obj(oop *from, intptr_t *to, int& pos) { *(oop *)(to + pos++) = *from; }

  // Floats are stored in native format in one JavaCallArgument slot at *to.

  static inline void put_float(jfloat  from, intptr_t *to)           { *(jfloat *)(to +   0  ) =  from;  }

  static inline void put_float(jfloat  from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) =  from; }

  static inline void put_float(jfloat *from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = *from; }

  // Doubles are stored in native word format in one JavaCallArgument

  // slot at *(to+1).

  static inline void put_double(jdouble  from, intptr_t *to) {

    *(jdouble*) (to + 1) = from;

  }

  static inline void put_double(jdouble  from, intptr_t *to, int& pos) {

    *(jdouble*) (to + 1 + pos) = from;

    pos += 2;

  }

  static inline void put_double(jdouble *from, intptr_t *to, int& pos) {

    *(jdouble*) (to + 1 + pos) = *from;

    pos += 2;

  }

  // The get_xxx routines, on the other hand, actually _do_ fetch

  // java primitive types from the interpreter stack.

  // No need to worry about alignment on Intel.

  static inline jint    get_int   (intptr_t *from) { return *(jint *)    from; }

  static inline jlong   get_long  (intptr_t *from) { return *(jlong *)  (from + 1); }

  static inline oop     get_obj   (intptr_t *from) { return *(oop *)     from; }

  static inline jfloat  get_float (intptr_t *from) { return *(jfloat *)  from; }

  static inline jdouble get_double(intptr_t *from) { return *(jdouble *)(from + 1); }

};