1 /*
   2  * Copyright 1998-2002 Sun Microsystems, Inc.  All Rights Reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 // This file holds platform-dependent routines used to write primitive jni
  26 // types to the array of arguments passed into JavaCalls::call
  27 
  28 class JNITypes : AllStatic {
  29   // These functions write a java primitive type (in native format)
  30   // to a java stack slot array to be passed as an argument to JavaCalls:calls.
  31   // I.e., they are functionally 'push' operations if they have a 'pos'
  32   // formal parameter.  Note that jlong's and jdouble's are written
  33   // _in reverse_ of the order in which they appear in the interpreter
  34   // stack.  This is because call stubs (see stubGenerator_zero.cpp)
  35   // reverse the argument list constructed by JavaCallArguments (see
  36   // javaCalls.hpp).
  37 
  38 private:
  39   // Helper routines.
  40   static inline void    put_int2 (jint *from, jint *to)           { to[0] = from[0]; to[1] = from[1]; }
  41   static inline void    put_int2 (jint *from, jint *to, int& pos) { put_int2 (from, (jint *)((intptr_t *)to + pos)); pos += 2; }
  42   static inline void    put_int2r(jint *from, jint *to)           { to[0] = from[1]; to[1] = from[0]; }
  43   static inline void    put_int2r(jint *from, jint *to, int& pos) { put_int2r(from, (jint *)((intptr_t *)to + pos)); pos += 2; }
  44 
  45 public:
  46   // Ints are stored in native format in one JavaCallArgument slot at *to.
  47   static inline void    put_int(jint  from, intptr_t *to)               { *(jint *)(to +   0  ) =  from; }
  48   static inline void    put_int(jint  from, intptr_t *to, int& pos)     { *(jint *)(to + pos++) =  from; }
  49   static inline void    put_int(jint *from, intptr_t *to, int& pos)     { *(jint *)(to + pos++) = *from; }
  50 
  51 #ifdef _LP64
  52   // Longs are stored in native format in one JavaCallArgument slot at *(to+1).
  53   static inline void    put_long(jlong  from, intptr_t *to)             { *(jlong *)(to + 1 +   0) =  from; }
  54   static inline void    put_long(jlong  from, intptr_t *to, int& pos)   { *(jlong *)(to + 1 + pos) =  from; pos += 2; }
  55   static inline void    put_long(jlong *from, intptr_t *to, int& pos)   { *(jlong *)(to + 1 + pos) = *from; pos += 2; }
  56 #else
  57   // Longs are stored in reversed native word format in two JavaCallArgument slots at *to.
  58   // The high half is in *(to+1) and the low half in *to.
  59   static inline void    put_long(jlong  from, intptr_t *to)            { put_int2r((jint *)&from, (jint *)to); }
  60   static inline void    put_long(jlong  from, intptr_t *to, int& pos)  { put_int2r((jint *)&from, (jint *)to, pos); }
  61   static inline void    put_long(jlong *from, intptr_t *to, int& pos)  { put_int2r((jint *) from, (jint *)to, pos); }
  62 #endif
  63 
  64   // Oops are stored in native format in one JavaCallArgument slot at *to.
  65   static inline void    put_obj(oop  from, intptr_t *to)                { *(oop *)(to +   0  ) =  from; }
  66   static inline void    put_obj(oop  from, intptr_t *to, int& pos)      { *(oop *)(to + pos++) =  from; }
  67   static inline void    put_obj(oop *from, intptr_t *to, int& pos)      { *(oop *)(to + pos++) = *from; }
  68 
  69   // Floats are stored in native format in one JavaCallArgument slot at *to.
  70   static inline void    put_float(jfloat  from, intptr_t *to)           { *(jfloat *)(to +   0  ) =  from; }
  71   static inline void    put_float(jfloat  from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) =  from; }
  72   static inline void    put_float(jfloat *from, intptr_t *to, int& pos) { *(jfloat *)(to + pos++) = *from; }
  73 
  74 #ifdef _LP64
  75   // Doubles are stored in native word format in one JavaCallArgument slot at *(to+1).
  76   static inline void    put_double(jdouble  from, intptr_t *to)           { *(jdouble *)(to + 1 +   0) =  from; }
  77   static inline void    put_double(jdouble  from, intptr_t *to, int& pos) { *(jdouble *)(to + 1 + pos) =  from; pos += 2; }
  78   static inline void    put_double(jdouble *from, intptr_t *to, int& pos) { *(jdouble *)(to + 1 + pos) = *from; pos += 2; }
  79 #else
  80   // Doubles are stored in reversed native word format in two JavaCallArgument slots at *to.
  81   static inline void    put_double(jdouble  from, intptr_t *to)           { put_int2r((jint *)&from, (jint *)to); }
  82   static inline void    put_double(jdouble  from, intptr_t *to, int& pos) { put_int2r((jint *)&from, (jint *)to, pos); }
  83   static inline void    put_double(jdouble *from, intptr_t *to, int& pos) { put_int2r((jint *) from, (jint *)to, pos); }
  84 #endif
  85 
  86   // The get_xxx routines, on the other hand, actually _do_ fetch
  87   // java primitive types from the interpreter stack.
  88   static inline jint    get_int(intptr_t *from)         { return *(jint *)from; }
  89 
  90 #ifdef _LP64
  91   static inline jlong   get_long(intptr_t *from)        { return *(jlong *)from; }
  92 #else
  93   static inline jlong   get_long(intptr_t *from)        { return ((jlong)(*(  signed int *)((jint *)from    )) << 32) |
  94                                                                  ((jlong)(*(unsigned int *)((jint *)from + 1)) <<  0); }
  95 #endif
  96 
  97   static inline oop     get_obj(intptr_t *from)         { return *(oop *)from; }
  98   static inline jfloat  get_float(intptr_t *from)       { return *(jfloat *)from; }
  99 
 100 #ifdef _LP64
 101   static inline jdouble get_double(intptr_t *from)      { return *(jdouble *)from; }
 102 #else
 103   static inline jdouble get_double(intptr_t *from)      { jlong jl = ((jlong)(*(  signed int *)((jint *)from    )) << 32) |
 104                                                                      ((jlong)(*(unsigned int *)((jint *)from + 1)) <<  0);
 105                                                           return *(jdouble *)&jl; }
 106 #endif
 107 
 108 };