/*

 * Copyright (c) 2014, Red Hat Inc. 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).

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; }

#undef _JNI_SLOT_OFFSET

#define _JNI_SLOT_OFFSET 1

  // 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 + _JNI_SLOT_OFFSET); }

  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 + _JNI_SLOT_OFFSET); }

#undef _JNI_SLOT_OFFSET

};