JDK14/Java14源码在线阅读

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 * published by the Free Software Foundation.
 *
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 * 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.
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#ifndef CPU_PPC_JNITYPES_PPC_HPP
#define CPU_PPC_JNITYPES_PPC_HPP

#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.

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