JDK14/Java14源码在线阅读

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 * 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
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#ifndef CPU_S390_JNITYPES_S390_HPP
#define CPU_S390_JNITYPES_S390_HPP

// This file holds platform-dependent routines used to write primitive
// jni types to the array of arguments passed into JavaCalls::call.

#include "jni.h"
#include "memory/allocation.hpp"
#include "oops/oop.hpp"

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 jlongs and
  // jdoubles are written _in reverse_ of the order in which they
  // appear in the interpreter stack. This is because call stubs (see
  // stubGenerator_s390.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 = 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 = 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 = 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 z/Architecture.

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